Bump importlib_metadata to 7

when re-submitting a form a second time, the cached file got lost

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: harmon758/postgresql-action@v1
         with:
-          postgresql version: '11'
+          postgresql version: '15'
           postgresql db: 'pretix'
           postgresql user: 'postgres'
           postgresql password: 'postgres'
@@ -66,6 +66,10 @@ jobs:
       - name: Run tests
         working-directory: ./src
         run: PRETIX_CONFIG_FILE=tests/travis_${{ matrix.database }}.cfg py.test -n 3 -p no:sugar --cov=./ --cov-report=xml --reruns 3 tests --maxfail=100
+      - name: Run concurrency tests
+        working-directory: ./src
+        run: PRETIX_CONFIG_FILE=tests/travis_${{ matrix.database }}.cfg py.test tests/concurrency_tests/ --reruns 0 --reuse-db
+        if: matrix.database == 'postgres'
       - name: Upload coverage
         uses: codecov/codecov-action@v1
         with:

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-bullseye
+FROM python:3.11-bookworm
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
@@ -20,20 +20,20 @@ RUN apt-get update && \
             supervisor \
             libmaxminddb0 \
             libmaxminddb-dev \
-            zlib1g-dev && \
+            zlib1g-dev \
+            nodejs  \
+            npm && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* && \
-    dpkg-reconfigure locales && \
-	locale-gen C.UTF-8 && \
-	/usr/sbin/update-locale LANG=C.UTF-8 && \
+    dpkg-reconfigure locales &&  \
+    locale-gen C.UTF-8 &&  \
+    /usr/sbin/update-locale LANG=C.UTF-8 && \
     mkdir /etc/pretix && \
     mkdir /data && \
     useradd -ms /bin/bash -d /pretix -u 15371 pretixuser && \
     echo 'pretixuser ALL=(ALL) NOPASSWD:SETENV: /usr/bin/supervisord' >> /etc/sudoers && \
     mkdir /static && \
-    mkdir /etc/supervisord && \
-	curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash - && \
-    apt-get install -y nodejs
+    mkdir /etc/supervisord
 
 
 ENV LC_ALL=C.UTF-8 \
@@ -63,10 +63,10 @@ RUN pip3 install -U \
 RUN chmod +x /usr/local/bin/pretix && \
     rm /etc/nginx/sites-enabled/default && \
     cd /pretix/src && \
-    rm -f pretix.cfg && \
-	mkdir -p data && \
-    chown -R pretixuser:pretixuser /pretix /data data && \
-	sudo -u pretixuser make production
+    rm -f pretix.cfg &&  \
+    mkdir -p data && \
+    chown -R pretixuser:pretixuser /pretix /data data &&  \
+    sudo -u pretixuser make production
 
 USER pretixuser
 VOLUME ["/etc/pretix", "/data"]

deployment/docker/pretix.bash

@@ -5,7 +5,7 @@ export DATA_DIR=/data/
 export HOME=/pretix
 
 AUTOMIGRATE=${AUTOMIGRATE:-yes}
-NUM_WORKERS_DEFAULT=$((2 * $(nproc --all)))
+NUM_WORKERS_DEFAULT=$((2 * $(nproc)))
 export NUM_WORKERS=${NUM_WORKERS:-$NUM_WORKERS_DEFAULT}
 
 if [ ! -d /data/logs ]; then

deployment/docker/production_settings.py

@@ -1,4 +1,4 @@
 from pretix.settings import *
 
 LOGGING['handlers']['mail_admins']['include_html'] = True
-STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.ManifestStaticFilesStorage'
+STORAGES["staticfiles"]["BACKEND"] = 'django.contrib.staticfiles.storage.ManifestStaticFilesStorage'

doc/admin/config.rst

@@ -75,7 +75,7 @@ Example::
     The cookie domain to be set. Defaults to ``None``.
 
 ``registration``
-    Enables or disables the registration of new admin users. Defaults to ``on``.
+    Enables or disables the registration of new admin users. Defaults to ``off``.
 
 ``password_reset``
     Enables or disables password reset. Defaults to ``on``.
@@ -152,6 +152,7 @@ Example::
     password=abcd
     host=localhost
     port=3306
+    advisory_lock_index=1
     sslmode=require
     sslrootcert=/etc/pretix/postgresql-ca.crt
     sslcert=/etc/pretix/postgresql-client-crt.crt
@@ -167,11 +168,17 @@ Example::
 ``user``, ``password``, ``host``, ``port``
     Connection details for the database connection. Empty by default.
 
+``advisory_lock_index``
+    On PostgreSQL, pretix uses the "advisory lock" feature. However, advisory locks use a server-wide name space and
+    and are not scoped to a specific database. If you run multiple pretix applications with the same PostgreSQL server,
+    you should set separate values for this setting (integers up to 256).
+
 ``sslmode``, ``sslrootcert``
     Connection TLS details for the PostgreSQL database connection. Possible values of ``sslmode`` are ``disable``, ``allow``, ``prefer``, ``require``, ``verify-ca``, and ``verify-full``. ``sslrootcert`` should be the accessible path of the ca certificate. Both values are empty by default.
 
 ``sslcert``, ``sslkey``
     Connection mTLS details for the PostgreSQL database connection. It's also necessary to specify ``sslmode`` and ``sslrootcert`` parameters, please check the correct values from the TLS part. ``sslcert`` should be the accessible path of the client certificate.  ``sslkey`` should be the accessible path of the client key. All values are empty by default.
+
 .. _`config-replica`:
 
 Database replica settings

doc/admin/installation/docker_smallscale.rst

@@ -26,7 +26,7 @@ installation guides):
 * `Docker`_
 * A SMTP server to send out mails, e.g. `Postfix`_ on your machine or some third-party server you have credentials for
 * A HTTP reverse proxy, e.g. `nginx`_ or Apache to allow HTTPS connections
-* A `PostgreSQL`_ 11+ database server
+* A `PostgreSQL`_ 12+ database server
 * A `redis`_ server
 
 We also recommend that you use a firewall, although this is not a pretix-specific recommendation. If you're new to

doc/admin/installation/enterprise.rst

@@ -68,7 +68,7 @@ generated key and installs the plugin from the URL we told you::
         mkdir -p /etc/ssh && \
         ssh-keyscan -t rsa -p 10022 code.rami.io >> /root/.ssh/known_hosts && \
         echo StrictHostKeyChecking=no >> /root/.ssh/config && \
-        DJANGO_SETTINGS_MODULE=pretix.settings pip3 install -U "git+ssh://git@code.rami.io:10022/pretix/pretix-slack.git@stable#egg=pretix-slack" && \
+        DJANGO_SETTINGS_MODULE= pip3 install -U "git+ssh://git@code.rami.io:10022/pretix/pretix-slack.git@stable#egg=pretix-slack" && \
         cd /pretix/src && \
         sudo -u pretixuser make production
     USER pretixuser

doc/admin/installation/manual_smallscale.rst

@@ -12,7 +12,7 @@ solution with many things readily set-up, look at :ref:`dockersmallscale`.
              get it right. If you're not feeling comfortable managing a Linux server, check out our hosting and service
              offers at `pretix.eu`_.
 
-We tested this guide on the Linux distribution **Debian 11.6** but it should work very similar on other
+We tested this guide on the Linux distribution **Debian 12** but it should work very similar on other
 modern distributions, especially on all systemd-based ones.
 
 Requirements
@@ -24,7 +24,7 @@ installation guides):
 * A python 3.9+ installation
 * A SMTP server to send out mails, e.g. `Postfix`_ on your machine or some third-party server you have credentials for
 * A HTTP reverse proxy, e.g. `nginx`_ or Apache to allow HTTPS connections
-* A `PostgreSQL`_ 11+ database server
+* A `PostgreSQL`_ 12+ database server
 * A `redis`_ server
 * A `nodejs`_ installation
 
@@ -64,7 +64,7 @@ Package dependencies
 
 To build and run pretix, you will need the following debian packages::
 
-    # apt-get install git build-essential python-dev python3-venv python3 python3-pip \
+    # apt-get install git build-essential python3-dev python3-venv python3 python3-pip \
                       python3-dev libxml2-dev libxslt1-dev libffi-dev zlib1g-dev libssl-dev \
                       gettext libpq-dev libjpeg-dev libopenjp2-7-dev
 
@@ -130,9 +130,10 @@ We now install pretix, its direct dependencies and gunicorn::
 
 Note that you need Python 3.9 or newer. You can find out your Python version using ``python -V``.
 
-We also need to create a data directory::
+We also need to create a data directory and allow your webserver to traverse to the root directory::
 
     (venv)$ mkdir -p /var/pretix/data/media
+    (venv)$ chmod +x /var/pretix
 
 Finally, we compile static files and translation data and create the database structure::
 
@@ -248,14 +249,14 @@ The following snippet is an example on how to configure a nginx proxy for pretix
         }
 
         location /static/ {
-            alias /var/pretix/venv/lib/python3.10/site-packages/pretix/static.dist/;
+            alias /var/pretix/venv/lib/python3.11/site-packages/pretix/static.dist/;
             access_log off;
             expires 365d;
             add_header Cache-Control "public";
         }
     }
 
-.. note:: Remember to replace the ``python3.10`` in the ``/static/`` path in the config
+.. note:: Remember to replace the ``python3.11`` in the ``/static/`` path in the config
           above with your python version.
 
 We recommend reading about setting `strong encryption settings`_ for your web server.

doc/admin/mysql2postgres.rst

@@ -16,12 +16,17 @@ already upgraded to pretix 5.0 or later, downgrade back to the last 4.x release
 Update database schema
 ----------------------
 
-Before you start, make sure your database schema is up to date::
+Before you start, make sure your database schema is up to date. With a local installation::
 
     # sudo -u pretix -s
     $ source /var/pretix/venv/bin/activate
     (venv)$ python -m pretix migrate
 
+With a docker installation::
+
+    docker exec -it pretix.service pretix migrate
+
+
 Install PostgreSQL
 ------------------
 
@@ -70,10 +75,14 @@ Of course, instead of all this you can also run a PostgreSQL docker container an
 Stop pretix
 -----------
 
-To prevent any more changes to your data, stop pretix from running::
+To prevent any more changes to your data, stop pretix from running. With a local installation::
 
     # systemctl stop pretix-web pretix-worker
 
+With docker::
+
+    # systemctl stop pretix
+
 Change configuration
 --------------------
 
@@ -90,12 +99,16 @@ Change the database configuration in your ``/etc/pretix/pretix.cfg`` file::
 Create database schema
 -----------------------
 
-To create the schema in your new PostgreSQL database, use the following commands::
+To create the schema in your new PostgreSQL database, use the following commands. With a local installation::
 
     # sudo -u pretix -s
     $ source /var/pretix/venv/bin/activate
     (venv)$ python -m pretix migrate
 
+With docker::
+
+    # docker run --rm -v /var/pretix-data:/data -v /etc/pretix:/etc/pretix -v /var/run/redis:/var/run/redis pretix/standalone:stable migrate
+
 
 Migrate your data
 -----------------
@@ -144,11 +157,18 @@ Afterwards, delete the file again::
 Start pretix
 ------------
 
-Now, restart pretix. Maybe stop your MySQL server as a verification step that you are no longer using it::
+Stop your MySQL server as a verification step that you are no longer using it::
 
     # systemctl stop mariadb
+
+Then, restart pretix. With a local installation::
+
     # systemctl start pretix-web pretix-worker
 
+With a docker installation::
+
+    # systemctl start pretix
+
 And you're done! After you've verified everything has been copied correctly, you can delete the old MySQL database.
 
 .. note:: Don't forget to update your backup process to back up your PostgreSQL database instead of your MySQL database now.

doc/api/deviceauth.rst

@@ -35,9 +35,13 @@ as well as the type of underlying hardware. Example:
        "os_name": "Android",
        "os_version": "2.3.6",
        "software_brand": "pretixdroid",
-       "software_version": "4.0.0"
+       "software_version": "4.0.0",
+       "rsa_pubkey": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqh…nswIDAQAB\n-----END PUBLIC KEY-----\n"
    }
 
+The ``rsa_pubkey`` is optional any only required for certain fatures such as working with reusable
+media and NFC cryptography.
+
 Every initialization token can only be used once. On success, you will receive a response containing
 information on your device as well as your API token:
 
@@ -137,9 +141,29 @@ The response will look like this:
          "id": 3,
          "name": "South entrance"
        }
-     }
+     },
+     "server": {
+       "version": {
+         "pretix": "3.6.0.dev0",
+         "pretix_numeric": 30060001000
+       }
+     },
+     "medium_key_sets": [
+       {
+         "public_id": 3456349,
+         "organizer": "foo",
+         "active": true,
+         "media_type": "nfc_mf0aes",
+         "uid_key": "base64-encoded-encrypted-key",
+         "diversification_key": "base64-encoded-encrypted-key",
+       }
+     ]
    }
 
+``"medium_key_sets`` will always be empty if you did not set an ``rsa_pubkey``.
+The individual keys in the key sets are encrypted with the device's ``rsa_pubkey``
+using ``RSA/ECB/PKCS1Padding``.
+
 Creating a new API key
 ----------------------
 

doc/api/resources/checkinlists.rst

@@ -37,12 +37,18 @@ allow_entry_after_exit                boolean                    If ``true``, su
 rules                                 object                     Custom check-in logic. The contents of this field are currently not considered a stable API and modifications through the API are highly discouraged.
 exit_all_at                           datetime                   Automatically check out (i.e. perform an exit scan) at this point in time. After this happened, this property will automatically be set exactly one day into the future. Note that this field is considered "internal configuration" and if you pull the list with ``If-Modified-Since``, the daily change in this field will not trigger a response.
 addon_match                           boolean                    If ``true``, tickets on this list can be redeemed by scanning their parent ticket if this still leads to an unambiguous match.
+ignore_in_statistics                  boolean                    If ``true``, check-ins on this list will be ignored in most reporting features.
+consider_tickets_used                 boolean                    If ``true`` (default), tickets checked in on this list will be considered "used" by other functionality, i.e. when checking if they can still be canceled.
 ===================================== ========================== =======================================================
 
 .. versionchanged:: 4.12
 
     The ``addon_match`` attribute has been added.
 
+.. versionchanged:: 2023.9
+
+    The ``ignore_in_statistics`` and ``consider_tickets_used`` attributes have been added.
+
 Endpoints
 ---------
 
@@ -767,4 +773,4 @@ Order position endpoints
    :statuscode 404: The requested order position or check-in list does not exist.
 
 
-.. _security issues: https://pretix.eu/about/de/blog/20220705-release-4111/
+.. _security issues: https://pretix.eu/about/de/blog/20220705-release-4111/

doc/api/resources/discounts.rst

@@ -31,9 +31,9 @@ subevent_mode                            strings                    Determines h
                                                                     ``"same"`` (discount is only applied for groups within
                                                                     the same date), or ``"distinct"`` (discount is only applied
                                                                     for groups with no two same dates).
-condition_all_products                   boolean                    If ``true``, the discount applies to all items.
+condition_all_products                   boolean                    If ``true``, the discount condition applies to all items.
 condition_limit_products                 list of integers           If ``condition_all_products`` is not set, this is a list
-                                                                    of internal item IDs that the discount applies to.
+                                                                    of internal item IDs that the discount condition applies to.
 condition_apply_to_addons                boolean                    If ``true``, the discount applies to add-on products as well,
                                                                     otherwise it only applies to top-level items. The discount never
                                                                     applies to bundled products.
@@ -48,6 +48,17 @@ benefit_discount_matching_percent        decimal (string)           The percenta
 benefit_only_apply_to_cheapest_n_matches integer                    If set higher than 0, the discount will only be applied to
                                                                     the cheapest matches. Useful for a "3 for 2"-style discount.
                                                                     Cannot be combined with ``condition_min_value``.
+benefit_same_products                    boolean                    If ``true``, the discount benefit applies to the same set of items
+                                                                    as the condition (see above).
+benefit_limit_products                   list of integers           If ``benefit_same_products`` is not set, this is a list
+                                                                    of internal item IDs that the discount benefit applies to.
+benefit_apply_to_addons                  boolean                    (Only used if ``benefit_same_products`` is ``false``.)
+                                                                    If ``true``, the discount applies to add-on products as well,
+                                                                    otherwise it only applies to top-level items. The discount never
+                                                                    applies to bundled products.
+benefit_ignore_voucher_discounted        boolean                    (Only used if ``benefit_same_products`` is ``false``.)
+                                                                    If ``true``, the discount does not apply to products which have
+                                                                    been discounted by a voucher.
 ======================================== ========================== =======================================================
 
 
@@ -94,6 +105,10 @@ Endpoints
             "condition_ignore_voucher_discounted": false,
             "condition_min_count": 3,
             "condition_min_value": "0.00",
+            "benefit_same_products": true,
+            "benefit_limit_products": [],
+            "benefit_apply_to_addons": true,
+            "benefit_ignore_voucher_discounted": false,
             "benefit_discount_matching_percent": "100.00",
             "benefit_only_apply_to_cheapest_n_matches": 1
           }
@@ -146,6 +161,10 @@ Endpoints
         "condition_ignore_voucher_discounted": false,
         "condition_min_count": 3,
         "condition_min_value": "0.00",
+        "benefit_same_products": true,
+        "benefit_limit_products": [],
+        "benefit_apply_to_addons": true,
+        "benefit_ignore_voucher_discounted": false,
         "benefit_discount_matching_percent": "100.00",
         "benefit_only_apply_to_cheapest_n_matches": 1
       }
@@ -184,6 +203,10 @@ Endpoints
         "condition_ignore_voucher_discounted": false,
         "condition_min_count": 3,
         "condition_min_value": "0.00",
+        "benefit_same_products": true,
+        "benefit_limit_products": [],
+        "benefit_apply_to_addons": true,
+        "benefit_ignore_voucher_discounted": false,
         "benefit_discount_matching_percent": "100.00",
         "benefit_only_apply_to_cheapest_n_matches": 1
       }
@@ -211,6 +234,10 @@ Endpoints
         "condition_ignore_voucher_discounted": false,
         "condition_min_count": 3,
         "condition_min_value": "0.00",
+        "benefit_same_products": true,
+        "benefit_limit_products": [],
+        "benefit_apply_to_addons": true,
+        "benefit_ignore_voucher_discounted": false,
         "benefit_discount_matching_percent": "100.00",
         "benefit_only_apply_to_cheapest_n_matches": 1
       }
@@ -267,6 +294,10 @@ Endpoints
         "condition_ignore_voucher_discounted": false,
         "condition_min_count": 3,
         "condition_min_value": "0.00",
+        "benefit_same_products": true,
+        "benefit_limit_products": [],
+        "benefit_apply_to_addons": true,
+        "benefit_ignore_voucher_discounted": false,
         "benefit_discount_matching_percent": "100.00",
         "benefit_only_apply_to_cheapest_n_matches": 1
       }

doc/api/resources/invoices.rst

@@ -12,6 +12,7 @@ The invoice resource contains the following public fields:
 Field                                 Type                       Description
 ===================================== ========================== =======================================================
 number                                string                     Invoice number (with prefix)
+event                                 string                     The slug of the parent event
 order                                 string                     Order code of the order this invoice belongs to
 is_cancellation                       boolean                    ``true``, if this invoice is the cancellation of a
                                                                  different invoice.
@@ -121,9 +122,13 @@ internal_reference                    string                     Customer's refe
 
    The attribute ``lines.subevent`` has been added.
 
+.. versionchanged:: 2023.8
 
-Endpoints
----------
+   The ``event`` attribute has been added. The organizer-level endpoint has been added.
+
+
+List of all invoices
+--------------------
 
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/invoices/
 
@@ -152,6 +157,7 @@ Endpoints
         "results": [
           {
             "number": "SAMPLECONF-00001",
+            "event": "sampleconf",
             "order": "ABC12",
             "is_cancellation": false,
             "invoice_from_name": "Big Events LLC",
@@ -221,6 +227,50 @@ Endpoints
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
 
+.. http:get:: /api/v1/organizers/(organizer)/invoices/
+
+   Returns a list of all invoices within all events of a given organizer (with sufficient access permissions).
+
+   Supported query parameters and output format of this endpoint are identical to the list endpoint within an event.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/invoices/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "number": "SAMPLECONF-00001",
+            "event": "sampleconf",
+            "order": "ABC12",
+            ...
+        ]
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
+
+Fetching individual invoices
+----------------------------
+
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/invoices/(number)/
 
    Returns information on one invoice, identified by its invoice number.
@@ -243,6 +293,7 @@ Endpoints
 
       {
         "number": "SAMPLECONF-00001",
+        "event": "sampleconf",
         "order": "ABC12",
         "is_cancellation": false,
         "invoice_from_name": "Big Events LLC",
@@ -337,6 +388,12 @@ Endpoints
    :statuscode 409: The file is not yet ready and will now be prepared. Retry the request after waiting for a few
                     seconds.
 
+
+Modifying invoices
+------------------
+
+Invoices cannot be edited directly, but the following actions can be triggered:
+
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/invoices/(invoice_no)/reissue/
 
    Cancels the invoice and creates a new one.

doc/api/resources/orders.rst

@@ -20,6 +20,7 @@ The order resource contains the following public fields:
 Field                                 Type                       Description
 ===================================== ========================== =======================================================
 code                                  string                     Order code
+event                                 string                     The slug of the parent event
 status                                string                     Order status, one of:
 
                                                                  * ``n`` – pending
@@ -130,6 +131,14 @@ last_modified                         datetime                   Last modificati
 
    The ``valid_if_pending`` attribute has been added.
 
+.. versionchanged:: 2023.8
+
+   The ``event`` attribute has been added. The organizer-level endpoint has been added.
+
+.. versionchanged:: 2023.9
+
+   The ``customer`` query parameter has been added.
+
 
 .. _order-position-resource:
 
@@ -289,6 +298,7 @@ List of all orders
         "results": [
           {
             "code": "ABC12",
+            "event": "sampleconf",
             "status": "p",
             "testmode": false,
             "secret": "k24fiuwvu8kxz3y1",
@@ -414,6 +424,7 @@ List of all orders
    :query string code: Only return orders that match the given order code
    :query string status: Only return orders in the given order status (see above)
    :query string search: Only return orders matching a given search query (matching for names, email addresses, and company names)
+   :query string customer: Only show orders linked to the given customer.
    :query integer item: Only return orders with a position that contains this item ID. *Warning:* Result will also include orders if they contain mixed items, and it will even return orders where the item is only contained in a canceled position.
    :query integer variation: Only return orders with a position that contains this variation ID. *Warning:* Result will also include orders if they contain mixed items and variations, and it will even return orders where the variation is only contained in a canceled position.
    :query boolean testmode: Only return orders with ``testmode`` set to ``true`` or ``false``
@@ -441,6 +452,48 @@ List of all orders
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
 
+.. http:get:: /api/v1/organizers/(organizer)/orders/
+
+   Returns a list of all orders within all events of a given organizer (with sufficient access permissions).
+
+   Supported query parameters and output format of this endpoint are identical to the list endpoint within an event,
+   with the exception that the ``pdf_data`` parameter is not supported here.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/orders/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+      X-Page-Generated: 2017-12-01T10:00:00Z
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "code": "ABC12",
+            "event": "sampleconf",
+            ...
+          }
+        ]
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
 Fetching individual orders
 --------------------------
 
@@ -466,6 +519,7 @@ Fetching individual orders
 
       {
         "code": "ABC12",
+        "event": "sampleconf",
         "status": "p",
         "testmode": false,
         "secret": "k24fiuwvu8kxz3y1",
@@ -1517,6 +1571,7 @@ List of all order positions
                            ``order__datetime,positionid``
    :query string order: Only return positions of the order with the given order code
    :query string search: Fuzzy search matching the attendee name, order code, invoice address name as well as to the beginning of the secret.
+   :query string customer: Only show orders linked to the given customer.
    :query integer item: Only return positions with the purchased item matching the given ID.
    :query integer item__in: Only return positions with the purchased item matching one of the given comma-separated IDs.
    :query integer variation: Only return positions with the purchased item variation matching the given ID.

doc/api/resources/reusablemedia.rst

@@ -18,7 +18,7 @@ The reusable medium resource contains the following public fields:
 Field                                 Type                       Description
 ===================================== ========================== =======================================================
 id                                    integer                    Internal ID of the medium
-type                                  string                     Type of medium, e.g. ``"barcode"`` or ``"nfc_uid"``.
+type                                  string                     Type of medium, e.g. ``"barcode"``, ``"nfc_uid"`` or ``"nfc_mf0aes"``.
 organizer                             string                     Organizer slug of the organizer who "owns" this medium.
 identifier                            string                     Unique identifier of the medium. The format depends on the ``type``.
 active                                boolean                    Whether this medium may be used.
@@ -37,6 +37,7 @@ Existing media types are:
 
 - ``barcode``
 - ``nfc_uid``
+- ``nfc_mf0aes``
 
 Endpoints
 ---------

doc/api/resources/sendmail_rules.rst

@@ -1,10 +1,10 @@
-Automated email rules
+Scheduled email rules
 =====================
 
 Resource description
 --------------------
 
-Automated email rules that specify emails that the system will send automatically at a specific point in time, e.g.
+Scheduled email rules that specify emails that the system will send automatically at a specific point in time, e.g.
 the day of the event.
 
 .. rst-class:: rest-resource-table
@@ -18,8 +18,19 @@ subject                               multi-lingual string       The subject of
 template                              multi-lingual string       The body of the email
 all_products                          boolean                    If ``true``, the email is sent to buyers of all products
 limit_products                        list of integers           List of product IDs, if ``all_products`` is not set
-include_pending                       boolean                    If ``true``, the email is sent to pending orders. If ``false``,
+[**DEPRECATED**] include_pending      boolean                    If ``true``, the email is sent to pending orders. If ``false``,
                                                                  only paid orders are considered.
+restrict_to_status                    list                       List of order states to restrict recipients to. Valid
+                                                                 entries are ``p`` for paid, ``e`` for expired, ``c`` for canceled,
+                                                                 ``n__pending_approval`` for pending approval,
+                                                                 ``n__not_pending_approval_and_not_valid_if_pending`` for payment
+                                                                 pending, ``n__valid_if_pending`` for payment pending but already confirmed,
+                                                                 and ``n__pending_overdue`` for pending with payment overdue.
+                                                                 The default is ``["p", "n__valid_if_pending"]``.
+checked_in_status                     string                     Check-in status to restrict recipients to. Valid strings are:
+                                                                 ``null`` for no filtering (default), ``checked_in`` for
+                                                                 limiting to attendees that are or have been checked in, and
+                                                                 ``no_checkin`` for limiting to attendees who have not checked in.
 date_is_absolute                      boolean                    If ``true``, the email is set at a specific point in time.
 send_date                             datetime                   If ``date_is_absolute`` is set: Date and time to send the email.
 send_offset_days                      integer                    If ``date_is_absolute`` is not set, this is the number of days
@@ -37,7 +48,10 @@ send_to                               string                     Can be ``"order
                                                                  or ``"both"``.
                                                                  date. Otherwise it is relative to the event start date.
 ===================================== ========================== =======================================================
+.. versionchanged:: 2023.7
 
+    The ``include_pending`` field has been  deprecated.
+    The ``restrict_to_status`` field has been added.
 
 Endpoints
 ---------
@@ -74,7 +88,12 @@ Endpoints
             "template": {"en": "Don't forget your tickets, download them at {url}"},
             "all_products": true,
             "limit_products": [],
-            "include_pending": false,
+            "restrict_to_status": [
+                "p",
+                "n__not_pending_approval_and_not_valid_if_pending",
+                "n__valid_if_pending"
+            ],
+            "checked_in_status": null,
             "send_date": null,
             "send_offset_days": 1,
             "send_offset_time": "18:00",
@@ -120,7 +139,12 @@ Endpoints
         "template": {"en": "Don't forget your tickets, download them at {url}"},
         "all_products": true,
         "limit_products": [],
-        "include_pending": false,
+        "restrict_to_status": [
+            "p",
+            "n__not_pending_approval_and_not_valid_if_pending",
+            "n__valid_if_pending"
+        ],
+        "checked_in_status": null,
         "send_date": null,
         "send_offset_days": 1,
         "send_offset_time": "18:00",
@@ -157,7 +181,12 @@ Endpoints
         "template": {"en": "Don't forget your tickets, download them at {url}"},
         "all_products": true,
         "limit_products": [],
-        "include_pending": false,
+        "restrict_to_status": [
+            "p",
+            "n__not_pending_approval_and_not_valid_if_pending",
+            "n__valid_if_pending"
+        ],
+        "checked_in_status": "checked_in",
         "send_date": null,
         "send_offset_days": 1,
         "send_offset_time": "18:00",
@@ -182,7 +211,12 @@ Endpoints
         "template": {"en": "Don't forget your tickets, download them at {url}"},
         "all_products": true,
         "limit_products": [],
-        "include_pending": false,
+        "restrict_to_status": [
+            "p",
+            "n__not_pending_approval_and_not_valid_if_pending",
+            "n__valid_if_pending"
+        ],
+        "checked_in_status": "checked_in",
         "send_date": null,
         "send_offset_days": 1,
         "send_offset_time": "18:00",
@@ -235,7 +269,12 @@ Endpoints
         "template": {"en": "Don't forget your tickets, download them at {url}"},
         "all_products": true,
         "limit_products": [],
-        "include_pending": false,
+        "restrict_to_status": [
+            "p",
+            "n__not_pending_approval_and_not_valid_if_pending",
+            "n__valid_if_pending"
+        ],
+        "checked_in_status": "checked_in",
         "send_date": null,
         "send_offset_days": 1,
         "send_offset_time": "18:00",

doc/api/resources/subevents.rst

@@ -68,6 +68,10 @@ last_modified                         datetime                   Last modificati
     The ``date_from_before``, ``date_from_after``, ``date_to_before``, and ``date_to_after`` query parameters have been
     added.
 
+.. versionchanged:: 2023.8.0
+
+    For the organizer-wide endpoint, the ``search`` query parameter has been modified to filter sub-events by their parent events slug too.
+
 Endpoints
 ---------
 
@@ -472,6 +476,7 @@ Endpoints
    :query date_to_after: If set to a date and time, only events that have an end date and end at or after the given time are returned.
    :query date_to_before: If set to a date and time, only events that have an end date and end at or before the given time are returned.
    :query ends_after: If set to a date and time, only events that happen during of after the given time are returned.
+   :query search: Only return events matching a given search query.
    :query sales_channel: If set to a sales channel identifier, the response will only contain subevents from events available on this sales channel.
    :param organizer: The ``slug`` field of a valid organizer
    :param event: The ``slug`` field of the event to fetch

doc/api/resources/webhooks.rst

@@ -67,6 +67,9 @@ The following values for ``action_types`` are valid with pretix core:
     * ``pretix.event.live.deactivated``
     * ``pretix.event.testmode.activated``
     * ``pretix.event.testmode.deactivated``
+    * ``pretix.customer.created``
+    * ``pretix.customer.changed``
+    * ``pretix.customer.anonymized``
 
 Installed plugins might register more valid values.
 

doc/development/implementation/i18n.rst

@@ -37,7 +37,7 @@ you to execute a piece of code with a different locale:
 This is very useful e.g. when sending an email to a user that has a different language than the user performing the
 action that causes the mail to be sent.
 
-.. _translation features: https://docs.djangoproject.com/en/1.9/topics/i18n/translation/
+.. _translation features: https://docs.djangoproject.com/en/4.2/topics/i18n/translation/
 .. _GNU gettext: https://www.gnu.org/software/gettext/
 .. _strings: https://django-i18nfield.readthedocs.io/en/latest/strings.html
 .. _database fields: https://django-i18nfield.readthedocs.io/en/latest/quickstart.html

doc/development/implementation/index.rst

@@ -18,3 +18,4 @@ Contents:
    email
    permissions
    logging
+   locking

doc/development/implementation/locking.rst

@@ -0,0 +1,69 @@
+.. highlight:: python
+
+Resource locking
+================
+
+.. versionchanged:: 2023.8
+
+   Our locking mechanism changed heavily in version 2023.8. Read `this PR`_ for background information.
+
+One of pretix's core objectives as a ticketing system could be described as the management of scarce resources.
+Specifically, the following types of scarce-ness exist in pretix:
+
+- Quotas can limit the number of tickets available
+- Seats can only be booked once
+- Vouchers can only be used a limited number of times
+- Some memberships can only be used a limited number of times
+
+For all of these, it is critical that we prevent race conditions.
+While for some events it wouldn't be a big deal to sell a ticket more or less, for some it would be problematic and selling the same seat twice would always be catastrophic.
+
+We therefore implement a standardized locking approach across the system to limit concurrency in cases where it could
+be problematic.
+
+To acquire a lock on a set of quotas to create a new order that uses that quota, you should follow the following pattern::
+
+    with transaction.atomic(durable=True):
+        quotas = Quota.objects.filter(...)
+        lock_objects(quotas, shared_lock_objects=[event])
+        check_quota(quotas)
+        create_ticket()
+
+The lock will automatically be released at the end of your database transaction.
+
+Generally, follow the following guidelines during your development:
+
+- **Always** acquire a lock on every **quota**, **voucher** or **seat** that you "use" during your transaction. "Use"
+  here means any action after which the quota, voucher or seat will be **less available**, such as creating a cart
+  position, creating an order, creating a blocking voucher, etc.
+
+  - There is **no need** to acquire a lock if you **free up** capacity, e.g. by canceling an order, deleting a voucher, etc.
+
+- **Always** acquire a shared lock on the ``event`` you are working in whenever you acquire a lock on a quota, voucher,
+  or seat.
+
+- Only call ``lock_objects`` **once** per transaction. If you violate this rule, `deadlocks`_ become possible.
+
+- For best performance, call ``lock_objects`` as **late** in your transaction as possible, but always before you check
+  if the desired resource is still available in sufficient quantity.
+
+Behind the scenes, the locking is implemented through `PostgreSQL advisory locks`_. You should also be aware of the following
+properties of our system:
+
+- In some situations, an exclusive lock on the ``event`` is used, such as when the system can't determine for sure which
+  seats will become unavailable after the transaction.
+
+- An exclusive lock on the event is also used if you pass more than 20 objects to ``lock_objects``. This is a performance
+  trade-off because it would take long to acquire all of the individual locks.
+
+- If ``lock_objects`` is unable to acquire a lock within 3 seconds, a ``LockTimeoutException`` will be thrown.
+
+.. note::
+
+   We currently do not use ``lock_objects`` for memberships. Instead, we use ``select_for_update()`` on the membership
+   model. This might change in the future, but you should usually not be concerned about it since
+   ``validate_memberships_in_order(lock=True)`` will handle it for you.
+
+.. _this PR: https://github.com/pretix/pretix/pull/2408
+.. _deadlocks: https://www.postgresql.org/docs/current/explicit-locking.html#LOCKING-DEADLOCKS
+.. _PostgreSQL advisory locks: https://www.postgresql.org/docs/11/explicit-locking.html#ADVISORY-LOCKS

doc/development/implementation/urlconfig.rst

@@ -15,25 +15,33 @@ and the admin panel is available at ``https://pretix.eu/control/event/bigorg/awe
 
 If the organizer now configures a custom domain like ``tickets.bigorg.com``, his event will
 from now on be available on ``https://tickets.bigorg.com/awesomecon/``. The former URL at
-``pretix.eu`` will redirect there. However, the admin panel will still only be available
-on ``pretix.eu`` for convenience and security reasons.
+``pretix.eu`` will redirect there. It's also possible to do this for just an event, in which
+case the event will be available on ``https://tickets.awesomecon.org/``.
+
+However, the admin panel will still only be available on ``pretix.eu`` for convenience and security reasons.
 
 URL routing
 -----------
 
 The hard part about implementing this URL routing in Django is that
 ``https://pretix.eu/bigorg/awesomecon/`` contains two parameters of nearly arbitrary content
-and ``https://tickets.bigorg.com/awesomecon/`` contains only one. The only robust way to do
-this is by having *separate* URL configuration for those two cases. In pretix, we call the
-former our ``maindomain`` config and the latter our ``subdomain`` config. For pretix's core
-modules we do some magic to avoid duplicate configuration, but for a fairly simple plugin with
-only a handful of routes, we recommend just configuring the two URL sets separately.
+and ``https://tickets.bigorg.com/awesomecon/`` contains only one and ``https://tickets.awesomecon.org/`` does not contain any.
+The only robust way to do this is by having *separate* URL configuration for those three cases.
 
+In pretix, we therefore do not have a global URL configuration, but three, living in the following modules:
+
+- ``pretix.multidomain.maindomain_urlconf``
+- ``pretix.multidomain.organizer_domain_urlconf``
+- ``pretix.multidomain.event_domain_urlconf``
+
+We provide some helper utilities to work with these to avoid duplicate configuration of the individual URLs.
 The file ``urls.py`` inside your plugin package will be loaded and scanned for URL configuration
 automatically and should be provided by any plugin that provides any view.
+However, unlike plain Django, we look not only for a ``urlpatterns`` attribute on the module but support other
+attributes like ``event_patterns`` and ``organizer_patterns`` as well.
 
-A very basic example that provides one view in the admin panel and one view in the frontend
-could look like this::
+For example, for a simple plugin that adds one URL to the backend and one event-level URL to the frontend, you can
+create the following configuration in your ``urls.py``::
 
     from django.urls import re_path
 
@@ -52,7 +60,7 @@ could look like this::
     As you can see, the view in the frontend is not included in the standard Django ``urlpatterns``
     setting but in a separate list with the name ``event_patterns``. This will automatically prepend
     the appropriate parameters to the regex (e.g. the event or the event and the organizer, depending
-    on the called domain).
+    on the called domain). For organizer-level views, ``organizer_patterns`` works the same way.
 
 If you only provide URLs in the admin area, you do not need to provide a ``event_patterns`` attribute.
 
@@ -71,11 +79,16 @@ is a python method that emulates a behavior similar to ``reverse``:
 
 .. autofunction:: pretix.multidomain.urlreverse.eventreverse
 
+If you need to communicate the URL externally, you can use a different method to ensure that it is always an absolute URL:
+
+.. autofunction:: pretix.multidomain.urlreverse.build_absolute_uri
+
 In addition, there is a template tag that works similar to ``url`` but takes an event or organizer object
 as its first argument and can be used like this::
 
     {% load eventurl %}
     <a href="{% eventurl request.event "presale:event.checkout" step="payment" %}">Pay</a>
+    <a href="{% abseventurl request.event "presale:event.checkout" step="payment" %}">Pay</a>
 
 
 Implementation details

doc/development/index.rst

@@ -12,3 +12,4 @@ Developer documentation
    api/index
    structure
    translation/index
+   nfc/index

doc/development/nfc/index.rst

@@ -0,0 +1,15 @@
+NFC media
+=========
+
+pretix supports using NFC chips as "reusable media", for example to store gift cards or tickets.
+
+Most of this implementation currently lives in our proprietary app pretixPOS, but in the future might also become part of our open-source pretixSCAN solution.
+Either way, we want this to be an open ecosystem and therefore document the exact mechanisms in use on the following pages.
+
+We support multiple implementations of NFC media, each documented on its own page:
+
+.. toctree::
+   :maxdepth: 2
+
+   uid
+   mf0aes

doc/development/nfc/mf0aes.rst

@@ -0,0 +1,113 @@
+Mifare Ultralight AES
+=====================
+
+We offer an implementation that provides a higher security level than the UID-based approach and uses the `Mifare Ultralight AES`_ chip sold by NXP.
+We believe the security model of this approach is adequate to the situation where this will usually be used and we'll outline known risks below.
+
+If you want to dive deeper into the properties of the Mifare Ultralight AES chip, we recommend reading the `data sheet`_.
+
+Random UIDs
+-----------
+
+Mifare Ultralight AES supports a feature that returns a randomized UID every time a non-authenticated user tries to
+read the UID. This has a strong privacy benefit, since no unauthorized entity can use the NFC chips to track users.
+On the other hand, this reduces interoperability of the system. For example, this prevents you from using the same NFC
+chips for a different purpose where you only need the UID. This will also prevent your guests from reading their UID
+themselves with their phones, which might be useful e.g. in debugging situations.
+
+Since there's no one-size-fits-all choice here, you can enable or disable this feature in the pretix organizer
+settings. If you change it, the change will apply to all newly encoded chips after the change.
+
+Key management
+--------------
+
+For every organizer, the server will generate create a "key set", which consists of a publicly known ID (random 32-bit integer) and two 16-byte keys ("diversification key" and "UID key").
+
+Using our :ref:`Device authentication mechanism <rest-deviceauth>`, an authorized device can submit a locally generated RSA public key to the server.
+This key can no longer changed on the server once it is set, thus protecting against the attack scenario of a leaked device API token.
+
+The server will then include key sets in the response to ``/api/v1/device/info``, encrypted with the device's RSA key.
+This includes all key sets generated for the organizer the device belongs to, as well as all keys of organizers that have granted sufficient access to this organizer.
+
+The device will decrypt the key sets using its RSA key and store the key sets locally.
+
+.. warning:: The device **will** have access to the raw key sets. Therefore, there is a risk of leaked master keys if an
+             authorized device is stolen or abused. Our implementation in pretixPOS attempts to make this very hard on
+             modern, non-rooted Android devices by keeping them encrypted with the RSA key and only storing the RSA key
+             in the hardware-backed keystore of the device. A sufficiently motivated attacker, however, will likely still
+             be able to extract the keys from a stolen device.
+
+Encoding a chip
+---------------
+
+When a new chip is encoded, the following steps will be taken:
+
+- The UID of the chip is retrieved.
+
+- A chip-specific key is generated using the mechanism documented in `AN10922`_ using the "diversification key" from the
+  organizer's key set as the CMAC key and the diversification input concatenated in the from of ``0x01 + UID + APPID + SYSTEMID``
+  with the following values:
+
+  - The UID of the chip as ``UID``
+
+  - ``"eu.pretix"`` (``0x65 0x75 0x2e 0x70 0x72 0x65 0x74 0x69 0x78``) as ``APPID``
+
+  - The ``public_id`` from the organizer's key set as a 4-byte big-endian value as ``SYSTEMID``
+
+- The chip-specific key is written to the chip as the "data protection key" (config pages 0x30 to 0x33)
+
+- The UID key from the organizer's key set is written to the chip as the "UID retrieval key" (config pages 0x34 to 0x37)
+
+- The config page 0x29 is set like this:
+
+  - ``RID_ACT`` (random UID) to ``1`` or ``0`` based on the organizer's configuration
+  - ``SEC_MSG_ACT`` (secure messaging) to ``1``
+  - ``AUTH0`` (first page that needs authentication) to 0x04 (first non-UID page)
+
+- The config page 0x2A is set like this:
+
+  - ``PROT`` to ``0`` (only write access restricted, not read access)
+  - ``AUTHLIM`` to ``256`` (maximum number of wrong authentications before "self-desctruction")
+  - Everything else to its default value (no lock bits are set)
+
+- The ``public_id`` of the key set will be written to page 0x04 as a big-endian value
+
+- The UID of the chip will be registered as a reusable medium on the server.
+
+.. warning:: During encoding, the chip-specific key and the UID key are transmitted in plain text over the air. The
+             security model therefore relies on the encoding of chips being performed in a trusted physical environment
+             to prevent a nearby attacker from sniffing the keys with a strong antenna.
+
+.. note:: If an attacker tries to authenticate with the chip 256 times using the wrong key, the chip will become
+          unusable. A chip may also become unusable if it is detached from the reader in the middle of the encoding
+          process (even though we've tried to implement it in a way that makes this unlikely).
+
+Usage
+-----
+
+When a chip is presented to the NFC reader, the following steps will be taken:
+
+- Command ``GET_VERSION`` is used to determine if it is a Mifare Ultralight AES chip (if not, abort).
+
+- Page 0x04 is read. If it is all zeroes, the chip is considered un-encoded (abort). If it contains a value that
+  corresponds to the ``public_id`` of a known key set, this key set is used for all further operations. If it contains
+  a different value, we consider this chip to belong to a different organizer or not to a pretix system at all (abort).
+
+- An authentication with the chip using the UID key is performed.
+
+- The UID of the chip will be read.
+
+- The chip-specific key will be derived using the mechanism described above in the encoding step.
+
+- An authentication with the chip using the chip-specific key is performed. If this is fully successful, this step
+  proves that the chip knows the same chip-specific key as we do and is therefore an authentic chip encoded by us and
+  we can trust its UID value.
+
+- The UID is transmitted to the server to fetch the correct medium.
+
+During these steps, the keys are never transmitted in plain text and can thus not be sniffed by a nearby attacker
+with a strong antenna.
+
+.. _Mifare Ultralight AES: https://www.nxp.com/products/rfid-nfc/mifare-hf/mifare-ultralight/mifare-ultralight-aes-enhanced-security-for-limited-use-contactless-applications:MF0AESx20
+.. _data sheet: https://www.nxp.com/docs/en/data-sheet/MF0AES(H)20.pdf
+.. _AN10922: https://www.nxp.com/docs/en/application-note/AN10922.pdf

doc/development/nfc/uid.rst

@@ -0,0 +1,10 @@
+UID-based
+=========
+
+With UID-based NFC, only the unique ID (UID) of the NFC chip is used for identification purposes.
+This can be used with virtually all NFC chips that provide compatibility with the NFC reader in use, typically at least all chips that comply with ISO/IEC 14443-3A.
+
+We make only one restriction: The UID may not start with ``08``, since that usually signifies a randomized UID that changes on every read (which would not be very useful).
+
+.. warning:: The UID-based approach provides only a very low level of security. It is easy to clone a chip with the same
+             UID and impersonate someone else.

doc/development/setup.rst

@@ -96,6 +96,20 @@ http://localhost:8000/control/ for the admin view.
           port (for example because you develop on `pretixdroid`_), you can check
           `Django's documentation`_ for more options.
 
+When running the local development webserver, ensure Celery is not configured
+in ``pretix.cfg``. i.e., you should remove anything such as::
+
+    [celery]
+    backend=redis://redis:6379/2
+    broker=redis://redis:6379/2
+
+If you choose to use Celery for development, you must also start a Celery worker
+process::
+
+    celery -A pretix.celery_app worker -l info
+
+However, beware that code changes will not auto-reload within Celery.
+
 .. _`checksandtests`:
 
 Code checks and unit tests

doc/plugins/exhibitors.rst

@@ -35,7 +35,7 @@ contact_name                          string                     Contact person
 contact_name_parts                    object of strings          Decomposition of contact name (i.e. given name, family name)
 contact_email                         string                     Contact person email address (or ``null``)
 booth                                 string                     Booth number (or ``null``). Maximum 100 characters.
-locale                                string                     Locale for communication with the exhibitor (or ``null``).
+locale                                string                     Locale for communication with the exhibitor.
 access_code                           string                     Access code for the exhibitor to access their data or use the lead scanning app (read-only).
 allow_lead_scanning                   boolean                    Enables lead scanning app
 allow_lead_access                     boolean                    Enables access to data gathered by the lead scanning app
@@ -230,7 +230,8 @@ Endpoints
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/vouchers/
 
    Returns a list of all vouchers connected to an exhibitor. The response contains the same data as described in
-   :ref:`rest-vouchers`.
+   :ref:`rest-vouchers` as well as for each voucher an additional field ``exhibitor_comment`` that is shown to the exhibitor. It can only
+   be modified using the ``attach`` API call below.
 
    **Example request**:
 
@@ -285,7 +286,7 @@ Endpoints
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/vouchers/attach/
 
    Attaches an **existing** voucher to an exhibitor. You need to send either the ``id`` **or** the ``code`` field of
-   the voucher.
+   the voucher. You can call this method multiple times to update the optional ``exhibitor_comment`` field.
 
    **Example request**:
 
@@ -296,7 +297,8 @@ Endpoints
       Accept: application/json, text/javascript
 
      {
-       "id": 15
+       "id": 15,
+       "exhibitor_comment": "Free ticket"
      }
 
    **Example request**:
@@ -308,7 +310,8 @@ Endpoints
       Accept: application/json, text/javascript
 
      {
-       "code": "43K6LKM37FBVR2YG"
+       "code": "43K6LKM37FBVR2YG",
+       "exhibitor_comment": "Free ticket"
      }
 
    **Example response**:
@@ -356,7 +359,6 @@ Endpoints
         "contact_email": "johnson@as.example.org",
         "booth": "A2",
         "locale": "de",
-        "access_code": "VKHZ2FU8",
         "allow_lead_scanning": true,
         "allow_lead_access": true,
         "allow_voucher_access": true,
@@ -411,7 +413,7 @@ Endpoints
 
    .. sourcecode:: http
 
-      PATCH /api/v1/organizers/bigevents/events/sampleconf/digitalcontents/1/ HTTP/1.1
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/ HTTP/1.1
       Host: pretix.eu
       Accept: application/json, text/javascript
       Content-Type: application/json
@@ -459,6 +461,36 @@ Endpoints
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event/exhibitor does not exist **or** you have no permission to change it.
 
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/send_access_code/
+
+   Sends an email to the exhibitor with their access code.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/send_access_code/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 204 No Content
+      Vary: Accept
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param code: The ``id`` field of the exhibitor to send an email for
+   :statuscode 200: no error
+   :statuscode 400: The exhibitor does not have an email address associated
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+   :statuscode 404: The requested exhibitor does not exist.
+   :statuscode 503: The email could not be sent.
+
 
 .. http:delete:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/
 

doc/user/events/widget.rst

@@ -124,6 +124,24 @@ If you want to disable voucher input in the widget, you can pass the ``disable-v
 
    <pretix-widget event="https://pretix.eu/demo/democon/" disable-vouchers></pretix-widget>
 
+Enabling the button-style single item select
+--------------------------------------------
+
+By default, the widget uses a checkbox to select items, that can only be bought in quantities of one. If you want to match
+the button-style of that checkbox with the one in the pretix shop, you can use the ``single-item-select`` attribute::
+
+   <pretix-widget event="https://pretix.eu/demo/democon/" single-item-select="button"></pretix-widget>
+
+.. image:: img/widget_checkbox_button.png
+   :align: center
+   :class: screenshot
+
+.. note::
+
+        Due to compatibilty with existing widget installations, the default value for ``single-item-select``
+        is ``checkbox``. This might change in the future, so make sure, to set the attribute to 
+        ``single-item-select="checkbox"`` if you need it.
+
 Filtering products
 ------------------
 
@@ -293,6 +311,16 @@ with that information::
     </pretix-widget>
 
 This works for the pretix Button as well, if you also specify a product.
+
+As data-attributes are reactive, you can change them with JavaScript as well. Please note, that once the user
+started the checkout process, we do not update the data-attributes in the existing checkout process to not
+interrupt the checkout UX.
+
+When updating data-attributes through JavaScript, make sure you do not have a stale reference to the HTMLNode of the
+widget. When the widget is created, the original HTMLNode can happen to be replaced. So make sure to always have a
+fresh reference like so  
+``document.querySelectorAll("pretix-widget, pretix-button, .pretix-widget-wrapper")``
+
 Currently, the following attributes are understood by pretix itself:
 
 * ``data-email`` will pre-fill the order email field as well as the attendee email field (if enabled).
@@ -329,125 +357,72 @@ Hosted or pretix Enterprise are active, you can pass the following fields:
 * If you use the campaigns plugin, you can pass a campaign ID as a value to ``data-campaign``. This way, all orders
   made through this widget will be counted towards this campaign.
 
-* If you use the tracking plugin, you can enable cross-domain tracking. To do so, you need to initialize the 
-  pretix-widget manually. Use the html code to embed the widget and add one the following code snippets. Make sure to
-  replace all occurrences of <MEASUREMENT_ID> with your Google Analytics MEASUREMENT_ID (UA-XXXXXXX-X or G-XXXXXXXX)
+* If you use the tracking plugin, you can enable cross-domain tracking. Please note: when you run your pretix-shop on a
+  subdomain of your main tracking domain, then you do not need cross-domain tracking as tracking automatically works
+  across subdomains. See :ref:`custom_domain` for how to set this up.
 
-  Please also make sure to add the embedding website to your `Referral exclusions
+  Please make sure to add the embedding website to your `Referral exclusions
   <https://support.google.com/analytics/answer/2795830>`_ in your Google Analytics settings.
 
-  If you use Google Analytics 4 (GA4 – G-XXXXXXXX)::
+  Add Google Analytics as you normally would with all your `window.dataLayer` and `gtag` configurations. Also add the
+  widget code normally. Then you have two options:
 
-    <script async src="https://www.googletagmanager.com/gtag/js?id=<MEASUREMENT_ID>"></script>
-    <script type="text/javascript">
-        window.dataLayer = window.dataLayer || [];
-        function gtag(){dataLayer.push(arguments);}
-        gtag('js', new Date());
-        gtag('config', '<MEASUREMENT_ID>');
+  * Block loading of the widget at most 2 seconds or until Google’s client- and session-ID are loaded. This method
+    uses `window.pretixWidgetCallback`. Note that if it takes longer than 2 seconds to load, client- and session-ID
+    are never passed to the widget. Make sure to replace all occurrences of <MEASUREMENT_ID> with your Google 
+    Analytics MEASUREMENT_ID (G-XXXXXXXX)::
 
-        window.pretixWidgetCallback = function () {
-            window.PretixWidget.build_widgets = false;
-            window.addEventListener('load', function() { // Wait for GA to be loaded
-                if (!window['google_tag_manager']) {
-                    window.PretixWidget.buildWidgets();
-                    return;
-                }
+        <script type="text/javascript">
+            window.pretixWidgetCallback = function () {
+                window.PretixWidget.build_widgets = false;
+                window.addEventListener('load', function() { // Wait for GA to be loaded
+                    if (!window['google_tag_manager']) {
+                        window.PretixWidget.buildWidgets();
+                        return;
+                    }
 
-                var clientId;
-                var sessionId;
-                var loadingTimeout;
-                function build() {
-                    // use loadingTimeout to make sure build() is only called once
-                    if (!loadingTimeout) return;
-                    window.clearTimeout(loadingTimeout);
-                    loadingTimeout = null;
-                    if (clientId) window.PretixWidget.widget_data["tracking-ga-id"] = clientId;
-                    if (sessionId) window.PretixWidget.widget_data["tracking-ga-sessid"] = sessionId;
-                    window.PretixWidget.buildWidgets();
-                };
-                // make sure to build pretix-widgets if gtag fails to load either client_id or session_id
-                loadingTimeout = window.setTimeout(build, 2000);
+                    var clientId;
+                    var sessionId;
+                    var loadingTimeout;
+                    function build() {
+                        // use loadingTimeout to make sure build() is only called once
+                        if (!loadingTimeout) return;
+                        window.clearTimeout(loadingTimeout);
+                        loadingTimeout = null;
+                        if (clientId) window.PretixWidget.widget_data["tracking-ga-id"] = clientId;
+                        if (sessionId) window.PretixWidget.widget_data["tracking-ga-sessid"] = sessionId;
+                        window.PretixWidget.buildWidgets();
+                    };
+                    // make sure to build pretix-widgets if gtag fails to load either client_id or session_id
+                    loadingTimeout = window.setTimeout(build, 2000);
 
+                    gtag('get', '<MEASUREMENT_ID>', 'client_id', function(id) {
+                        clientId = id;
+                        if (sessionId !== undefined) build();
+                    });
+                    gtag('get', '<MEASUREMENT_ID>', 'session_id', function(id) {
+                        sessionId = id;
+                        if (clientId !== undefined) build();
+                    });
+                });
+            };
+        </script>
+
+  * Or asynchronously set data-attributes – the widgets are shown immediately, but once the user has started checkout,
+    data-attributes are not updated. Make sure to replace all occurrences of <MEASUREMENT_ID> with your Google 
+    Analytics MEASUREMENT_ID (G-XXXXXXXX)::
+
+        <script type="text/javascript">
+            window.addEventListener('load', function() {
                 gtag('get', '<MEASUREMENT_ID>', 'client_id', function(id) {
-                    clientId = id;
-                    if (sessionId !== undefined) build();
+                    const widgets = document.querySelectorAll("pretix-widget, pretix-button, .pretix-widget-wrapper");
+                    widgets.forEach(widget => widget.setAttribute("data-tracking-ga-id", id))
                 });
                 gtag('get', '<MEASUREMENT_ID>', 'session_id', function(id) {
-                    sessionId = id;
-                    if (clientId !== undefined) build();
+                    const widgets = document.querySelectorAll("pretix-widget, pretix-button, .pretix-widget-wrapper");
+                    widgets.forEach(widget => widget.setAttribute("data-tracking-ga-sessid", id))
                 });
             });
-        };
-    </script>
-
-  If you use Universal Analytics with ``gtag.js`` (UA-XXXXXXX-X)::
-
-    <script async src="https://www.googletagmanager.com/gtag/js?id=<MEASUREMENT_ID>"></script>
-    <script type="text/javascript">
-        window.dataLayer = window.dataLayer || [];
-        function gtag(){dataLayer.push(arguments);}
-        gtag('js', new Date());
-        gtag('config', '<MEASUREMENT_ID>');
-
-        window.pretixWidgetCallback = function () {
-            window.PretixWidget.build_widgets = false;
-            window.addEventListener('load', function() { // Wait for GA to be loaded
-                if (!window['google_tag_manager']) {
-                    window.PretixWidget.buildWidgets();
-                    return;
-                }
-
-                // make sure to build pretix-widgets if gtag fails to load client_id
-                var loadingTimeout = window.setTimeout(function() {
-                    loadingTimeout = null;
-                    window.PretixWidget.buildWidgets();
-                }, 1000);
-
-                gtag('get', '<MEASUREMENT_ID>', 'client_id', function(id) {
-                    if (loadingTimeout) {
-                        window.clearTimeout(loadingTimeout);
-                        window.PretixWidget.widget_data["tracking-ga-id"] = id;
-                        window.PretixWidget.buildWidgets();
-                    }
-                });
-            });
-        };
-    </script>
-
-  If you use ``analytics.js`` (Universal Analytics)::
-
-    <script>
-        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-        })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-        ga('create', '<MEASUREMENT_ID>', 'auto');
-        ga('send', 'pageview');
-
-        window.pretixWidgetCallback = function () {
-            window.PretixWidget.build_widgets = false;
-            window.addEventListener('load', function() { // Wait for GA to be loaded
-                if (!window['ga'] || !ga.create) {
-                    // Tracking is probably blocked
-                    window.PretixWidget.buildWidgets()
-                    return;
-                }
-
-                var loadingTimeout = window.setTimeout(function() {
-                    loadingTimeout = null;
-                    window.PretixWidget.buildWidgets();
-                }, 1000);
-                ga(function(tracker) {
-                    if (loadingTimeout) {
-                        window.clearTimeout(loadingTimeout);
-                        window.PretixWidget.widget_data["tracking-ga-id"] = tracker.get('clientId');
-                        window.PretixWidget.buildWidgets();
-                    }
-                });
-            });
-        };
-    </script>
-
+        </script>  
 
 .. _Let's Encrypt: https://letsencrypt.org/

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
   "css-inline==0.8.*",
   "defusedcsv>=1.1.0",
   "dj-static",
-  "Django==4.1.*",
+  "Django==4.2.*",
   "django-bootstrap3==23.1.*",
   "django-compressor==4.3.*",
   "django-countries==7.5.*",
@@ -59,7 +59,7 @@ dependencies = [
   "dnspython==2.3.*",
   "drf_ujson2==1.7.*",
   "geoip2==4.*",
-  "importlib_metadata==6.*",  # Polyfill, we can probably drop this once we require Python 3.10+
+  "importlib_metadata==7.*",  # Polyfill, we can probably drop this once we require Python 3.10+
   "isoweek",
   "jsonschema",
   "kombu==5.3.*",
@@ -90,7 +90,7 @@ dependencies = [
   "pytz-deprecation-shim==0.1.*",
   "pyuca",
   "qrcode==7.4.*",
-  "redis==4.5.*,>=4.5.4",
+  "redis==4.6.*",
   "reportlab==4.0.*",
   "requests==2.31.*",
   "sentry-sdk==1.15.*",
@@ -110,8 +110,10 @@ dependencies = [
 [project.optional-dependencies]
 memcached = ["pylibmc"]
 dev = [
+  "aiohttp==3.8.*",
   "coverage",
   "coveralls",
+  "fakeredis==2.18.*",
   "flake8==6.0.*",
   "freezegun",
   "isort==5.12.*",
@@ -119,6 +121,7 @@ dev = [
   "potypo",
   "pycodestyle==2.10.*",
   "pyflakes==3.0.*",
+  "pytest-asyncio",
   "pytest-cache",
   "pytest-cov",
   "pytest-django==4.*",

src/pretix/__init__.py

@@ -19,4 +19,4 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-__version__ = "2023.7.0.dev0"
+__version__ = "2023.9.1"

src/pretix/_base_settings.py

@@ -89,6 +89,7 @@ ALL_LANGUAGES = [
     ('fi', _('Finnish')),
     ('gl', _('Galician')),
     ('el', _('Greek')),
+    ('id', _('Indonesian')),
     ('it', _('Italian')),
     ('lv', _('Latvian')),
     ('pl', _('Polish')),
@@ -196,7 +197,14 @@ STATICFILES_DIRS = [
 
 STATICI18N_ROOT = os.path.join(BASE_DIR, "pretix/static")
 
-STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.ManifestStaticFilesStorage'
+STORAGES = {
+    "default": {
+        "BACKEND": "django.core.files.storage.FileSystemStorage",
+    },
+    "staticfiles": {
+        "BACKEND": "django.contrib.staticfiles.storage.ManifestStaticFilesStorage",
+    },
+}
 
 # if os.path.exists(os.path.join(DATA_DIR, 'static')):
 #     STATICFILES_DIRS.insert(0, os.path.join(DATA_DIR, 'static'))
@@ -252,3 +260,20 @@ PRETIX_PRIMARY_COLOR = '#8E44B3'
 # stressful for some cache setups so it is enabled by default and currently can't be enabled through pretix.cfg
 CACHE_LARGE_VALUES_ALLOWED = False
 CACHE_LARGE_VALUES_ALIAS = 'default'
+
+# Allowed file extensions for various places plus matching Pillow formats.
+# Never allow EPS, it is full of dangerous bugs.
+FILE_UPLOAD_EXTENSIONS_IMAGE = (".png", ".jpg", ".gif", ".jpeg")
+PILLOW_FORMATS_IMAGE = ('PNG', 'GIF', 'JPEG')
+
+FILE_UPLOAD_EXTENSIONS_FAVICON = (".ico", ".png", "jpg", ".gif", ".jpeg")
+
+FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE = (".png", "jpg", ".gif", ".jpeg", ".bmp", ".tif", ".tiff", ".jfif")
+PILLOW_FORMATS_QUESTIONS_IMAGE = ('PNG', 'GIF', 'JPEG', 'BMP', 'TIFF')
+
+FILE_UPLOAD_EXTENSIONS_EMAIL_ATTACHMENT = (
+    ".png", ".jpg", ".gif", ".jpeg", ".pdf", ".txt", ".docx", ".gif", ".svg",
+    ".pptx", ".ppt", ".doc", ".xlsx", ".xls", ".jfif", ".heic", ".heif", ".pages",
+    ".bmp", ".tif", ".tiff"
+)
+FILE_UPLOAD_EXTENSIONS_OTHER = FILE_UPLOAD_EXTENSIONS_EMAIL_ATTACHMENT

src/pretix/api/auth/devicesecurity.py

@@ -223,6 +223,7 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('POST', 'api-v1:checkinrpc.redeem'),
         ('GET', 'api-v1:checkinrpc.search'),
         ('POST', 'api-v1:reusablemedium-lookup'),
+        ('POST', 'api-v1:reusablemedium-list'),
     )
 
 

src/pretix/api/migrations/0011_bigint.py

@@ -0,0 +1,91 @@
+# Generated by Django 4.2.4 on 2023-09-26 12:01
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("pretixapi", "0010_webhook_comment"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="apicall",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="oauthaccesstoken",
+            name="user",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="%(app_label)s_%(class)s",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="oauthapplication",
+            name="user",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="%(app_label)s_%(class)s",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="oauthgrant",
+            name="user",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="%(app_label)s_%(class)s",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="oauthidtoken",
+            name="user",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="%(app_label)s_%(class)s",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="oauthrefreshtoken",
+            name="user",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="%(app_label)s_%(class)s",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="webhook",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="webhookcall",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="webhookeventlistener",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+    ]

src/pretix/api/serializers/checkin.py

@@ -38,7 +38,7 @@ class CheckinListSerializer(I18nAwareModelSerializer):
         model = CheckinList
         fields = ('id', 'name', 'all_products', 'limit_products', 'subevent', 'checkin_count', 'position_count',
                   'include_pending', 'auto_checkin_sales_channels', 'allow_multiple_entries', 'allow_entry_after_exit',
-                  'rules', 'exit_all_at', 'addon_match')
+                  'rules', 'exit_all_at', 'addon_match', 'ignore_in_statistics', 'consider_tickets_used')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)

src/pretix/api/serializers/discount.py

@@ -32,11 +32,13 @@ class DiscountSerializer(I18nAwareModelSerializer):
                   'available_until', 'subevent_mode', 'condition_all_products', 'condition_limit_products',
                   'condition_apply_to_addons', 'condition_min_count', 'condition_min_value',
                   'benefit_discount_matching_percent', 'benefit_only_apply_to_cheapest_n_matches',
-                  'condition_ignore_voucher_discounted')
+                  'benefit_same_products', 'benefit_limit_products', 'benefit_apply_to_addons',
+                  'benefit_ignore_voucher_discounted', 'condition_ignore_voucher_discounted')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['condition_limit_products'].queryset = self.context['event'].items.all()
+        self.fields['benefit_limit_products'].queryset = self.context['event'].items.all()
 
     def validate(self, data):
         data = super().validate(data)

src/pretix/api/serializers/event.py

@@ -817,6 +817,10 @@ class EventSettingsSerializer(SettingsSerializer):
         'reusable_media_type_nfc_uid',
         'reusable_media_type_nfc_uid_autocreate_giftcard',
         'reusable_media_type_nfc_uid_autocreate_giftcard_currency',
+        'reusable_media_type_nfc_mf0aes',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard_currency',
+        'reusable_media_type_nfc_mf0aes_random_uid',
     ]
     readonly_fields = [
         # These are read-only since they are currently only settable on organizers, not events
@@ -826,6 +830,10 @@ class EventSettingsSerializer(SettingsSerializer):
         'reusable_media_type_nfc_uid',
         'reusable_media_type_nfc_uid_autocreate_giftcard',
         'reusable_media_type_nfc_uid_autocreate_giftcard_currency',
+        'reusable_media_type_nfc_mf0aes',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard_currency',
+        'reusable_media_type_nfc_mf0aes_random_uid',
     ]
 
     def __init__(self, *args, **kwargs):
@@ -894,6 +902,8 @@ class DeviceEventSettingsSerializer(EventSettingsSerializer):
         'name_scheme',
         'reusable_media_type_barcode',
         'reusable_media_type_nfc_uid',
+        'reusable_media_type_nfc_mf0aes',
+        'reusable_media_type_nfc_mf0aes_random_uid',
         'system_question_order',
     ]
 

src/pretix/api/serializers/order.py

@@ -22,11 +22,13 @@
 import logging
 import os
 from collections import Counter, defaultdict
+from datetime import timedelta
 from decimal import Decimal
 
 import pycountry
 from django.conf import settings
 from django.core.files import File
+from django.db import models
 from django.db.models import F, Q
 from django.utils.encoding import force_str
 from django.utils.timezone import now
@@ -58,10 +60,11 @@ from pretix.base.models.orders import (
 )
 from pretix.base.pdf import get_images, get_variables
 from pretix.base.services.cart import error_messages
-from pretix.base.services.locking import NoLockManager
+from pretix.base.services.locking import LOCK_TRUST_WINDOW, lock_objects
 from pretix.base.services.pricing import (
     apply_discounts, get_line_price, get_listed_price, is_included_for_free,
 )
+from pretix.base.services.quotas import QuotaAvailability
 from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
 from pretix.base.signals import register_ticket_outputs
 from pretix.helpers.countries import CachedCountries
@@ -283,11 +286,12 @@ class FailedCheckinSerializer(I18nAwareModelSerializer):
     raw_item = serializers.PrimaryKeyRelatedField(queryset=Item.objects.none(), required=False, allow_null=True)
     raw_variation = serializers.PrimaryKeyRelatedField(queryset=ItemVariation.objects.none(), required=False, allow_null=True)
     raw_subevent = serializers.PrimaryKeyRelatedField(queryset=SubEvent.objects.none(), required=False, allow_null=True)
+    nonce = serializers.CharField(required=False, allow_null=True)
 
     class Meta:
         model = Checkin
         fields = ('error_reason', 'error_explanation', 'raw_barcode', 'raw_item', 'raw_variation',
-                  'raw_subevent', 'datetime', 'type', 'position')
+                  'raw_subevent', 'nonce', 'datetime', 'type', 'position')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -372,11 +376,15 @@ class PdfDataSerializer(serializers.Field):
                 self.context['vars_images'] = get_images(self.context['event'])
 
             for k, f in self.context['vars'].items():
-                try:
-                    res[k] = f['evaluate'](instance, instance.order, ev)
-                except:
-                    logger.exception('Evaluating PDF variable failed')
-                    res[k] = '(error)'
+                if 'evaluate_bulk' in f:
+                    # Will be evaluated later by our list serializers
+                    res[k] = (f['evaluate_bulk'], instance)
+                else:
+                    try:
+                        res[k] = f['evaluate'](instance, instance.order, ev)
+                    except:
+                        logger.exception('Evaluating PDF variable failed')
+                        res[k] = '(error)'
 
             if not hasattr(ev, '_cached_meta_data'):
                 ev._cached_meta_data = ev.meta_data
@@ -429,6 +437,38 @@ class PdfDataSerializer(serializers.Field):
             return res
 
 
+class OrderPositionListSerializer(serializers.ListSerializer):
+
+    def to_representation(self, data):
+        # We have a custom implementation of this method because PdfDataSerializer() might keep some elements unevaluated
+        # with a (callable, input) tuple. We'll loop over these entries and evaluate them bulk-wise to save on SQL queries.
+
+        if isinstance(self.parent, OrderSerializer) and isinstance(self.parent.parent, OrderListSerializer):
+            # Do not execute our custom code because it will be executed by OrderListSerializer later for the
+            # full result set.
+            return super().to_representation(data)
+
+        iterable = data.all() if isinstance(data, models.Manager) else data
+
+        data = []
+        evaluate_queue = defaultdict(list)
+
+        for item in iterable:
+            entry = self.child.to_representation(item)
+            if "pdf_data" in entry:
+                for k, v in entry["pdf_data"].items():
+                    if isinstance(v, tuple) and callable(v[0]):
+                        evaluate_queue[v[0]].append((v[1], entry, k))
+            data.append(entry)
+
+        for func, entries in evaluate_queue.items():
+            results = func([item for (item, entry, k) in entries])
+            for (item, entry, k), result in zip(entries, results):
+                entry["pdf_data"][k] = result
+
+        return data
+
+
 class OrderPositionSerializer(I18nAwareModelSerializer):
     checkins = CheckinSerializer(many=True, read_only=True)
     answers = AnswerSerializer(many=True)
@@ -440,6 +480,7 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
     attendee_name = serializers.CharField(required=False)
 
     class Meta:
+        list_serializer_class = OrderPositionListSerializer
         model = OrderPosition
         fields = ('id', 'order', 'positionid', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts',
                   'company', 'street', 'zipcode', 'city', 'country', 'state', 'discount',
@@ -468,6 +509,20 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
     def validate(self, data):
         raise TypeError("this serializer is readonly")
 
+    def to_representation(self, data):
+        if isinstance(self.parent, (OrderListSerializer, OrderPositionListSerializer)):
+            # Do not execute our custom code because it will be executed by OrderListSerializer later for the
+            # full result set.
+            return super().to_representation(data)
+
+        entry = super().to_representation(data)
+        if "pdf_data" in entry:
+            for k, v in entry["pdf_data"].items():
+                if isinstance(v, tuple) and callable(v[0]):
+                    entry["pdf_data"][k] = v[0]([v[1]])[0]
+
+        return entry
+
 
 class RequireAttentionField(serializers.Field):
     def to_representation(self, instance: OrderPosition):
@@ -562,7 +617,7 @@ class PaymentURLField(serializers.URLField):
     def to_representation(self, instance: OrderPayment):
         if instance.state != OrderPayment.PAYMENT_STATE_CREATED:
             return None
-        return build_absolute_uri(self.context['event'], 'presale:event.order.pay', kwargs={
+        return build_absolute_uri(instance.order.event, 'presale:event.order.pay', kwargs={
             'order': instance.order.code,
             'secret': instance.order.secret,
             'payment': instance.pk,
@@ -607,13 +662,42 @@ class OrderRefundSerializer(I18nAwareModelSerializer):
 
 class OrderURLField(serializers.URLField):
     def to_representation(self, instance: Order):
-        return build_absolute_uri(self.context['event'], 'presale:event.order', kwargs={
+        return build_absolute_uri(instance.event, 'presale:event.order', kwargs={
             'order': instance.code,
             'secret': instance.secret,
         })
 
 
+class OrderListSerializer(serializers.ListSerializer):
+
+    def to_representation(self, data):
+        # We have a custom implementation of this method because PdfDataSerializer() might keep some elements
+        # unevaluated with a (callable, input) tuple. We'll loop over these entries and evaluate them bulk-wise to
+        # save on SQL queries.
+        iterable = data.all() if isinstance(data, models.Manager) else data
+
+        data = []
+        evaluate_queue = defaultdict(list)
+
+        for item in iterable:
+            entry = self.child.to_representation(item)
+            for p in entry.get("positions", []):
+                if "pdf_data" in p:
+                    for k, v in p["pdf_data"].items():
+                        if isinstance(v, tuple) and callable(v[0]):
+                            evaluate_queue[v[0]].append((v[1], p, k))
+            data.append(entry)
+
+        for func, entries in evaluate_queue.items():
+            results = func([item for (item, entry, k) in entries])
+            for (item, entry, k), result in zip(entries, results):
+                entry["pdf_data"][k] = result
+
+        return data
+
+
 class OrderSerializer(I18nAwareModelSerializer):
+    event = SlugRelatedField(slug_field='slug', read_only=True)
     invoice_address = InvoiceAddressSerializer(allow_null=True)
     positions = OrderPositionSerializer(many=True, read_only=True)
     fees = OrderFeeSerializer(many=True, read_only=True)
@@ -627,8 +711,9 @@ class OrderSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = Order
+        list_serializer_class = OrderListSerializer
         fields = (
-            'code', 'status', 'testmode', 'secret', 'email', 'phone', 'locale', 'datetime', 'expires', 'payment_date',
+            'code', 'event', 'status', 'testmode', 'secret', 'email', 'phone', 'locale', 'datetime', 'expires', 'payment_date',
             'payment_provider', 'fees', 'total', 'comment', 'custom_followup_at', 'invoice_address', 'positions', 'downloads',
             'checkin_attention', 'last_modified', 'payments', 'refunds', 'require_approval', 'sales_channel',
             'url', 'customer', 'valid_if_pending'
@@ -1061,338 +1146,367 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         else:
             ia = None
 
-        lock_required = False
+        quotas_by_item = {}
+        quota_diff_for_locking = Counter()
+        voucher_diff_for_locking = Counter()
+        seat_diff_for_locking = Counter()
+        quota_usage = Counter()
+        voucher_usage = Counter()
+        seat_usage = Counter()
+        v_budget = {}
+        now_dt = now()
+        delete_cps = []
+        consume_carts = validated_data.pop('consume_carts', [])
+
         for pos_data in positions_data:
-            pos_data['_quotas'] = list(
-                pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
-                if pos_data.get('variation')
-                else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent'))
-            )
-            if pos_data.get('voucher') or pos_data.get('seat') or any(q.size is not None for q in pos_data['_quotas']):
-                lock_required = True
+            if (pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent')) not in quotas_by_item:
+                quotas_by_item[pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent')] = list(
+                    pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
+                    if pos_data.get('variation')
+                    else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent'))
+                )
+            for q in quotas_by_item[pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent')]:
+                quota_diff_for_locking[q] += 1
+            if pos_data.get('voucher'):
+                voucher_diff_for_locking[pos_data['voucher']] += 1
+            if pos_data.get('seat'):
+                try:
+                    seat = self.context['event'].seats.get(seat_guid=pos_data['seat'], subevent=pos_data.get('subevent'))
+                except Seat.DoesNotExist:
+                    pos_data['seat'] = Seat.DoesNotExist
+                else:
+                    pos_data['seat'] = seat
+                    seat_diff_for_locking[pos_data['seat']] += 1
 
-        lockfn = self.context['event'].lock
-        if simulate or not lock_required:
-            lockfn = NoLockManager
-        with lockfn() as now_dt:
-            free_seats = set()
-            seats_seen = set()
-            consume_carts = validated_data.pop('consume_carts', [])
-            delete_cps = []
-            quota_avail_cache = {}
-            v_budget = {}
-            voucher_usage = Counter()
-            if consume_carts:
-                for cp in CartPosition.objects.filter(
-                    event=self.context['event'], cart_id__in=consume_carts, expires__gt=now()
-                ):
-                    quotas = (cp.variation.quotas.filter(subevent=cp.subevent)
-                              if cp.variation else cp.item.quotas.filter(subevent=cp.subevent))
-                    for quota in quotas:
-                        if quota not in quota_avail_cache:
-                            quota_avail_cache[quota] = list(quota.availability())
-                        if quota_avail_cache[quota][1] is not None:
-                            quota_avail_cache[quota][1] += 1
-                    if cp.voucher:
-                        voucher_usage[cp.voucher] -= 1
-                    if cp.expires > now_dt:
-                        if cp.seat:
-                            free_seats.add(cp.seat)
-                    delete_cps.append(cp)
+        if consume_carts:
+            offset = now() + timedelta(seconds=LOCK_TRUST_WINDOW)
+            for cp in CartPosition.objects.filter(
+                event=self.context['event'], cart_id__in=consume_carts, expires__gt=now_dt
+            ):
+                quotas = (cp.variation.quotas.filter(subevent=cp.subevent)
+                          if cp.variation else cp.item.quotas.filter(subevent=cp.subevent))
+                for quota in quotas:
+                    if cp.expires > offset:
+                        quota_diff_for_locking[quota] -= 1
+                    quota_usage[quota] -= 1
+                if cp.voucher:
+                    if cp.expires > offset:
+                        voucher_diff_for_locking[cp.voucher] -= 1
+                    voucher_usage[cp.voucher] -= 1
+                if cp.seat:
+                    if cp.expires > offset:
+                        seat_diff_for_locking[cp.seat] -= 1
+                    seat_usage[cp.seat] -= 1
+                delete_cps.append(cp)
 
-            errs = [{} for p in positions_data]
+        if not simulate:
+            full_lock_required = seat_diff_for_locking and self.context['event'].settings.seating_minimal_distance > 0
+            if full_lock_required:
+                # We lock the entire event in this case since we don't want to deal with fine-granular locking
+                # in the case of seating distance enforcement
+                lock_objects([self.context['event']])
+            else:
+                lock_objects(
+                    [q for q, d in quota_diff_for_locking.items() if d > 0 and q.size is not None and not force] +
+                    [v for v, d in voucher_diff_for_locking.items() if d > 0 and not force] +
+                    [s for s, d in seat_diff_for_locking.items() if d > 0],
+                    shared_lock_objects=[self.context['event']]
+                )
 
-            for i, pos_data in enumerate(positions_data):
+        qa = QuotaAvailability()
+        qa.queue(*[q for q, d in quota_diff_for_locking.items() if d > 0])
+        qa.compute()
 
-                if pos_data.get('voucher'):
-                    v = pos_data['voucher']
+        # These are not technically correct as diff use due to the time offset applied above, so let's prevent accidental
+        # use further down
+        del quota_diff_for_locking, voucher_diff_for_locking, seat_diff_for_locking
 
-                    if pos_data.get('addon_to'):
-                        errs[i]['voucher'] = ['Vouchers are currently not supported for add-on products.']
-                        continue
+        errs = [{} for p in positions_data]
 
-                    if not v.applies_to(pos_data['item'], pos_data.get('variation')):
-                        errs[i]['voucher'] = [error_messages['voucher_invalid_item']]
-                        continue
+        for i, pos_data in enumerate(positions_data):
+            if pos_data.get('voucher'):
+                v = pos_data['voucher']
 
-                    if v.subevent_id and pos_data.get('subevent').pk != v.subevent_id:
-                        errs[i]['voucher'] = [error_messages['voucher_invalid_subevent']]
-                        continue
+                if pos_data.get('addon_to'):
+                    errs[i]['voucher'] = ['Vouchers are currently not supported for add-on products.']
+                    continue
 
-                    if v.valid_until is not None and v.valid_until < now_dt:
-                        errs[i]['voucher'] = [error_messages['voucher_expired']]
-                        continue
+                if not v.applies_to(pos_data['item'], pos_data.get('variation')):
+                    errs[i]['voucher'] = [error_messages['voucher_invalid_item']]
+                    continue
 
-                    voucher_usage[v] += 1
-                    if voucher_usage[v] > 0:
-                        redeemed_in_carts = CartPosition.objects.filter(
-                            Q(voucher=pos_data['voucher']) & Q(event=self.context['event']) & Q(expires__gte=now_dt)
-                        ).exclude(pk__in=[cp.pk for cp in delete_cps])
-                        v_avail = v.max_usages - v.redeemed - redeemed_in_carts.count()
-                        if v_avail < voucher_usage[v]:
-                            errs[i]['voucher'] = [
-                                'The voucher has already been used the maximum number of times.'
-                            ]
+                if v.subevent_id and pos_data.get('subevent').pk != v.subevent_id:
+                    errs[i]['voucher'] = [error_messages['voucher_invalid_subevent']]
+                    continue
 
-                    if v.budget is not None:
-                        price = pos_data.get('price')
-                        listed_price = get_listed_price(pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent'))
+                if v.valid_until is not None and v.valid_until < now_dt:
+                    errs[i]['voucher'] = [error_messages['voucher_expired']]
+                    continue
 
-                        if pos_data.get('voucher'):
-                            price_after_voucher = pos_data.get('voucher').calculate_price(listed_price)
-                        else:
-                            price_after_voucher = listed_price
-                        if price is None:
-                            price = price_after_voucher
+                voucher_usage[v] += 1
+                if voucher_usage[v] > 0:
+                    redeemed_in_carts = CartPosition.objects.filter(
+                        Q(voucher=pos_data['voucher']) & Q(event=self.context['event']) & Q(expires__gte=now_dt)
+                    ).exclude(pk__in=[cp.pk for cp in delete_cps])
+                    v_avail = v.max_usages - v.redeemed - redeemed_in_carts.count()
+                    if v_avail < voucher_usage[v]:
+                        errs[i]['voucher'] = [
+                            'The voucher has already been used the maximum number of times.'
+                        ]
 
-                        if v not in v_budget:
-                            v_budget[v] = v.budget - v.budget_used()
-                        disc = max(listed_price - price, 0)
-                        if disc > v_budget[v]:
-                            new_disc = v_budget[v]
-                            v_budget[v] -= new_disc
-                            if new_disc == Decimal('0.00') or pos_data.get('price') is not None:
-                                errs[i]['voucher'] = [
-                                    'The voucher has a remaining budget of {}, therefore a discount of {} can not be '
-                                    'given.'.format(v_budget[v] + new_disc, disc)
-                                ]
-                                continue
-                            pos_data['price'] = price + (disc - new_disc)
-                        else:
-                            v_budget[v] -= disc
+                if v.budget is not None:
+                    price = pos_data.get('price')
+                    listed_price = get_listed_price(pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent'))
 
-                seated = pos_data.get('item').seat_category_mappings.filter(subevent=pos_data.get('subevent')).exists()
-                if pos_data.get('seat'):
-                    if pos_data.get('addon_to'):
-                        errs[i]['seat'] = ['Seats are currently not supported for add-on products.']
-                        continue
-
-                    if not seated:
-                        errs[i]['seat'] = ['The specified product does not allow to choose a seat.']
-                    try:
-                        seat = self.context['event'].seats.get(seat_guid=pos_data['seat'], subevent=pos_data.get('subevent'))
-                    except Seat.DoesNotExist:
-                        errs[i]['seat'] = ['The specified seat does not exist.']
-                    else:
-                        pos_data['seat'] = seat
-                        if (seat not in free_seats and not seat.is_available(sales_channel=validated_data.get('sales_channel', 'web'))) or seat in seats_seen:
-                            errs[i]['seat'] = [gettext_lazy('The selected seat "{seat}" is not available.').format(seat=seat.name)]
-                        seats_seen.add(seat)
-                elif seated:
-                    errs[i]['seat'] = ['The specified product requires to choose a seat.']
-
-                requested_valid_from = pos_data.pop('requested_valid_from', None)
-                if 'valid_from' not in pos_data and 'valid_until' not in pos_data:
-                    valid_from, valid_until = pos_data['item'].compute_validity(
-                        requested_start=(
-                            max(requested_valid_from, now())
-                            if requested_valid_from and pos_data['item'].validity_dynamic_start_choice
-                            else now()
-                        ),
-                        enforce_start_limit=True,
-                        override_tz=self.context['event'].timezone,
-                    )
-                    pos_data['valid_from'] = valid_from
-                    pos_data['valid_until'] = valid_until
-
-            if not force:
-                for i, pos_data in enumerate(positions_data):
                     if pos_data.get('voucher'):
-                        if pos_data['voucher'].allow_ignore_quota or pos_data['voucher'].block_quota:
+                        price_after_voucher = pos_data.get('voucher').calculate_price(listed_price)
+                    else:
+                        price_after_voucher = listed_price
+                    if price is None:
+                        price = price_after_voucher
+
+                    if v not in v_budget:
+                        v_budget[v] = v.budget - v.budget_used()
+                    disc = max(listed_price - price, 0)
+                    if disc > v_budget[v]:
+                        new_disc = v_budget[v]
+                        v_budget[v] -= new_disc
+                        if new_disc == Decimal('0.00') or pos_data.get('price') is not None:
+                            errs[i]['voucher'] = [
+                                'The voucher has a remaining budget of {}, therefore a discount of {} can not be '
+                                'given.'.format(v_budget[v] + new_disc, disc)
+                            ]
                             continue
+                        pos_data['price'] = price + (disc - new_disc)
+                    else:
+                        v_budget[v] -= disc
 
-                    if pos_data.get('subevent'):
-                        if pos_data.get('item').pk in pos_data['subevent'].item_overrides and pos_data['subevent'].item_overrides[pos_data['item'].pk].disabled:
-                            errs[i]['item'] = [gettext_lazy('The product "{}" is not available on this date.').format(
-                                str(pos_data.get('item'))
-                            )]
-                        if (
-                                pos_data.get('variation') and pos_data['variation'].pk in pos_data['subevent'].var_overrides and
-                                pos_data['subevent'].var_overrides[pos_data['variation'].pk].disabled
-                        ):
-                            errs[i]['item'] = [gettext_lazy('The product "{}" is not available on this date.').format(
-                                str(pos_data.get('item'))
-                            )]
+            seated = pos_data.get('item').seat_category_mappings.filter(subevent=pos_data.get('subevent')).exists()
+            if pos_data.get('seat'):
+                if pos_data.get('addon_to'):
+                    errs[i]['seat'] = ['Seats are currently not supported for add-on products.']
+                    continue
+                if not seated:
+                    errs[i]['seat'] = ['The specified product does not allow to choose a seat.']
+                seat = pos_data['seat']
+                if seat is Seat.DoesNotExist:
+                    errs[i]['seat'] = ['The specified seat does not exist.']
+                else:
+                    seat_usage[seat] += 1
+                    if (seat_usage[seat] > 0 and not seat.is_available(sales_channel=validated_data.get('sales_channel', 'web'))) or seat_usage[seat] > 1:
+                        errs[i]['seat'] = [gettext_lazy('The selected seat "{seat}" is not available.').format(seat=seat.name)]
+            elif seated:
+                errs[i]['seat'] = ['The specified product requires to choose a seat.']
 
-                    new_quotas = pos_data['_quotas']
-                    if len(new_quotas) == 0:
-                        errs[i]['item'] = [gettext_lazy('The product "{}" is not assigned to a quota.').format(
+            requested_valid_from = pos_data.pop('requested_valid_from', None)
+            if 'valid_from' not in pos_data and 'valid_until' not in pos_data:
+                valid_from, valid_until = pos_data['item'].compute_validity(
+                    requested_start=(
+                        max(requested_valid_from, now())
+                        if requested_valid_from and pos_data['item'].validity_dynamic_start_choice
+                        else now()
+                    ),
+                    enforce_start_limit=True,
+                    override_tz=self.context['event'].timezone,
+                )
+                pos_data['valid_from'] = valid_from
+                pos_data['valid_until'] = valid_until
+
+        if not force:
+            for i, pos_data in enumerate(positions_data):
+                if pos_data.get('voucher'):
+                    if pos_data['voucher'].allow_ignore_quota or pos_data['voucher'].block_quota:
+                        continue
+
+                if pos_data.get('subevent'):
+                    if pos_data.get('item').pk in pos_data['subevent'].item_overrides and pos_data['subevent'].item_overrides[pos_data['item'].pk].disabled:
+                        errs[i]['item'] = [gettext_lazy('The product "{}" is not available on this date.').format(
+                            str(pos_data.get('item'))
+                        )]
+                    if (
+                            pos_data.get('variation') and pos_data['variation'].pk in pos_data['subevent'].var_overrides and
+                            pos_data['subevent'].var_overrides[pos_data['variation'].pk].disabled
+                    ):
+                        errs[i]['item'] = [gettext_lazy('The product "{}" is not available on this date.').format(
                             str(pos_data.get('item'))
                         )]
-                    else:
-                        for quota in new_quotas:
-                            if quota not in quota_avail_cache:
-                                quota_avail_cache[quota] = list(quota.availability())
 
-                            if quota_avail_cache[quota][1] is not None:
-                                quota_avail_cache[quota][1] -= 1
-                                if quota_avail_cache[quota][1] < 0:
-                                    errs[i]['item'] = [
-                                        gettext_lazy('There is not enough quota available on quota "{}" to perform the operation.').format(
-                                            quota.name
-                                        )
-                                    ]
-
-            if any(errs):
-                raise ValidationError({'positions': errs})
-
-            if validated_data.get('locale', None) is None:
-                validated_data['locale'] = self.context['event'].settings.locale
-            order = Order(event=self.context['event'], **validated_data)
-            order.set_expires(subevents=[p.get('subevent') for p in positions_data])
-            order.meta_info = "{}"
-            order.total = Decimal('0.00')
-            if validated_data.get('require_approval') is not None:
-                order.require_approval = validated_data['require_approval']
-            if simulate:
-                order = WrappedModel(order)
-                order.last_modified = now()
-                order.code = 'PREVIEW'
-            else:
-                order.save()
-
-            if ia:
-                if not simulate:
-                    ia.order = order
-                    ia.save()
+                new_quotas = quotas_by_item[pos_data.get('item'), pos_data.get('variation'), pos_data.get('subevent')]
+                if len(new_quotas) == 0:
+                    errs[i]['item'] = [gettext_lazy('The product "{}" is not assigned to a quota.').format(
+                        str(pos_data.get('item'))
+                    )]
                 else:
-                    order.invoice_address = ia
-                    ia.last_modified = now()
+                    for quota in new_quotas:
+                        quota_usage[quota] += 1
+                        if quota_usage[quota] > 0 and qa.results[quota][1] is not None:
+                            if qa.results[quota][1] < quota_usage[quota]:
+                                errs[i]['item'] = [
+                                    gettext_lazy('There is not enough quota available on quota "{}" to perform the operation.').format(
+                                        quota.name
+                                    )
+                                ]
 
-            # Generate position objects
-            pos_map = {}
-            for pos_data in positions_data:
-                addon_to = pos_data.pop('addon_to', None)
-                attendee_name = pos_data.pop('attendee_name', '')
-                if attendee_name and not pos_data.get('attendee_name_parts'):
-                    pos_data['attendee_name_parts'] = {
-                        '_legacy': attendee_name
-                    }
-                pos = OrderPosition(**{k: v for k, v in pos_data.items() if k != 'answers' and k != '_quotas' and k != 'use_reusable_medium'})
-                if simulate:
-                    pos.order = order._wrapped
-                else:
-                    pos.order = order
-                if addon_to:
-                    if simulate:
-                        pos.addon_to = pos_map[addon_to]
-                    else:
-                        pos.addon_to = pos_map[addon_to]
+        if any(errs):
+            raise ValidationError({'positions': errs})
 
-                pos_map[pos.positionid] = pos
-                pos_data['__instance'] = pos
-
-            # Calculate prices if not set
-            for pos_data in positions_data:
-                pos = pos_data['__instance']
-                if pos.addon_to_id and is_included_for_free(pos.item, pos.addon_to):
-                    listed_price = Decimal('0.00')
-                else:
-                    listed_price = get_listed_price(pos.item, pos.variation, pos.subevent)
-
-                if pos.price is None:
-                    if pos.voucher:
-                        price_after_voucher = pos.voucher.calculate_price(listed_price)
-                    else:
-                        price_after_voucher = listed_price
-
-                    line_price = get_line_price(
-                        price_after_voucher=price_after_voucher,
-                        custom_price_input=None,
-                        custom_price_input_is_net=False,
-                        tax_rule=pos.item.tax_rule,
-                        invoice_address=ia,
-                        bundled_sum=Decimal('0.00'),
-                    )
-                    pos.price = line_price.gross
-                    pos._auto_generated_price = True
-                else:
-                    if pos.voucher:
-                        if not pos.item.tax_rule or pos.item.tax_rule.price_includes_tax:
-                            price_after_voucher = max(pos.price, pos.voucher.calculate_price(listed_price))
-                        else:
-                            price_after_voucher = max(pos.price - pos.tax_value, pos.voucher.calculate_price(listed_price))
-                    else:
-                        price_after_voucher = listed_price
-                    pos._auto_generated_price = False
-                pos._voucher_discount = listed_price - price_after_voucher
-                if pos.voucher:
-                    pos.voucher_budget_use = max(listed_price - price_after_voucher, Decimal('0.00'))
-
-            order_positions = [pos_data['__instance'] for pos_data in positions_data]
-            discount_results = apply_discounts(
-                self.context['event'],
-                order.sales_channel,
-                [
-                    (cp.item_id, cp.subevent_id, cp.price, bool(cp.addon_to), cp.is_bundled, pos._voucher_discount)
-                    for cp in order_positions
-                ]
-            )
-            for cp, (new_price, discount) in zip(order_positions, discount_results):
-                if new_price != pos.price and pos._auto_generated_price:
-                    pos.price = new_price
-                pos.discount = discount
-
-            # Save instances
-            for pos_data in positions_data:
-                answers_data = pos_data.pop('answers', [])
-                use_reusable_medium = pos_data.pop('use_reusable_medium', None)
-                pos = pos_data['__instance']
-                pos._calculate_tax()
-
-                if simulate:
-                    pos = WrappedModel(pos)
-                    pos.id = 0
-                    answers = []
-                    for answ_data in answers_data:
-                        options = answ_data.pop('options', [])
-                        answ = WrappedModel(QuestionAnswer(**answ_data))
-                        answ.options = WrappedList(options)
-                        answers.append(answ)
-                    pos.answers = answers
-                    pos.pseudonymization_id = "PREVIEW"
-                    pos.checkins = []
-                    pos_map[pos.positionid] = pos
-                else:
-                    if pos.voucher:
-                        Voucher.objects.filter(pk=pos.voucher.pk).update(redeemed=F('redeemed') + 1)
-                    pos.save()
-                    seen_answers = set()
-                    for answ_data in answers_data:
-                        # Workaround for a pretixPOS bug :-(
-                        if answ_data.get('question') in seen_answers:
-                            continue
-                        seen_answers.add(answ_data.get('question'))
-
-                        options = answ_data.pop('options', [])
-
-                        if isinstance(answ_data['answer'], File):
-                            an = answ_data.pop('answer')
-                            answ = pos.answers.create(**answ_data, answer='')
-                            answ.file.save(os.path.basename(an.name), an, save=False)
-                            answ.answer = 'file://' + answ.file.name
-                            answ.save()
-                        else:
-                            answ = pos.answers.create(**answ_data)
-                            answ.options.add(*options)
-
-                    if use_reusable_medium:
-                        use_reusable_medium.linked_orderposition = pos
-                        use_reusable_medium.save(update_fields=['linked_orderposition'])
-                        use_reusable_medium.log_action(
-                            'pretix.reusable_medium.linked_orderposition.changed',
-                            data={
-                                'by_order': order.code,
-                                'linked_orderposition': pos.pk,
-                            }
-                        )
+        if validated_data.get('locale', None) is None:
+            validated_data['locale'] = self.context['event'].settings.locale
+        order = Order(event=self.context['event'], **validated_data)
+        order.set_expires(subevents=[p.get('subevent') for p in positions_data])
+        order.meta_info = "{}"
+        order.total = Decimal('0.00')
+        if validated_data.get('require_approval') is not None:
+            order.require_approval = validated_data['require_approval']
+        if simulate:
+            order = WrappedModel(order)
+            order.last_modified = now()
+            order.code = 'PREVIEW'
+        else:
+            order.save()
 
+        if ia:
             if not simulate:
-                for cp in delete_cps:
-                    if cp.addon_to_id:
+                ia.order = order
+                ia.save()
+            else:
+                order.invoice_address = ia
+                ia.last_modified = now()
+
+        # Generate position objects
+        pos_map = {}
+        for pos_data in positions_data:
+            addon_to = pos_data.pop('addon_to', None)
+            attendee_name = pos_data.pop('attendee_name', '')
+            if attendee_name and not pos_data.get('attendee_name_parts'):
+                pos_data['attendee_name_parts'] = {
+                    '_legacy': attendee_name
+                }
+            pos = OrderPosition(**{k: v for k, v in pos_data.items() if k != 'answers' and k != '_quotas' and k != 'use_reusable_medium'})
+            if simulate:
+                pos.order = order._wrapped
+            else:
+                pos.order = order
+            if addon_to:
+                if simulate:
+                    pos.addon_to = pos_map[addon_to]
+                else:
+                    pos.addon_to = pos_map[addon_to]
+
+            pos_map[pos.positionid] = pos
+            pos_data['__instance'] = pos
+
+        # Calculate prices if not set
+        for pos_data in positions_data:
+            pos = pos_data['__instance']
+            if pos.addon_to_id and is_included_for_free(pos.item, pos.addon_to):
+                listed_price = Decimal('0.00')
+            else:
+                listed_price = get_listed_price(pos.item, pos.variation, pos.subevent)
+
+            if pos.price is None:
+                if pos.voucher:
+                    price_after_voucher = pos.voucher.calculate_price(listed_price)
+                else:
+                    price_after_voucher = listed_price
+
+                line_price = get_line_price(
+                    price_after_voucher=price_after_voucher,
+                    custom_price_input=None,
+                    custom_price_input_is_net=False,
+                    tax_rule=pos.item.tax_rule,
+                    invoice_address=ia,
+                    bundled_sum=Decimal('0.00'),
+                )
+                pos.price = line_price.gross
+                pos._auto_generated_price = True
+            else:
+                if pos.voucher:
+                    if not pos.item.tax_rule or pos.item.tax_rule.price_includes_tax:
+                        price_after_voucher = max(pos.price, pos.voucher.calculate_price(listed_price))
+                    else:
+                        price_after_voucher = max(pos.price - pos.tax_value, pos.voucher.calculate_price(listed_price))
+                else:
+                    price_after_voucher = listed_price
+                pos._auto_generated_price = False
+            pos._voucher_discount = listed_price - price_after_voucher
+            if pos.voucher:
+                pos.voucher_budget_use = max(listed_price - price_after_voucher, Decimal('0.00'))
+
+        order_positions = [pos_data['__instance'] for pos_data in positions_data]
+        discount_results = apply_discounts(
+            self.context['event'],
+            order.sales_channel,
+            [
+                (cp.item_id, cp.subevent_id, cp.price, bool(cp.addon_to), cp.is_bundled, pos._voucher_discount)
+                for cp in order_positions
+            ]
+        )
+        for cp, (new_price, discount) in zip(order_positions, discount_results):
+            if new_price != pos.price and pos._auto_generated_price:
+                pos.price = new_price
+            pos.discount = discount
+
+        # Save instances
+        for pos_data in positions_data:
+            answers_data = pos_data.pop('answers', [])
+            use_reusable_medium = pos_data.pop('use_reusable_medium', None)
+            pos = pos_data['__instance']
+            pos._calculate_tax()
+
+            if simulate:
+                pos = WrappedModel(pos)
+                pos.id = 0
+                answers = []
+                for answ_data in answers_data:
+                    options = answ_data.pop('options', [])
+                    answ = WrappedModel(QuestionAnswer(**answ_data))
+                    answ.options = WrappedList(options)
+                    answers.append(answ)
+                pos.answers = answers
+                pos.pseudonymization_id = "PREVIEW"
+                pos.checkins = []
+                pos_map[pos.positionid] = pos
+            else:
+                if pos.voucher:
+                    Voucher.objects.filter(pk=pos.voucher.pk).update(redeemed=F('redeemed') + 1)
+                pos.save()
+                seen_answers = set()
+                for answ_data in answers_data:
+                    # Workaround for a pretixPOS bug :-(
+                    if answ_data.get('question') in seen_answers:
                         continue
-                    cp.addons.all().delete()
-                    cp.delete()
+                    seen_answers.add(answ_data.get('question'))
+
+                    options = answ_data.pop('options', [])
+
+                    if isinstance(answ_data['answer'], File):
+                        an = answ_data.pop('answer')
+                        answ = pos.answers.create(**answ_data, answer='')
+                        answ.file.save(os.path.basename(an.name), an, save=False)
+                        answ.answer = 'file://' + answ.file.name
+                        answ.save()
+                    else:
+                        answ = pos.answers.create(**answ_data)
+                        answ.options.add(*options)
+
+                if use_reusable_medium:
+                    use_reusable_medium.linked_orderposition = pos
+                    use_reusable_medium.save(update_fields=['linked_orderposition'])
+                    use_reusable_medium.log_action(
+                        'pretix.reusable_medium.linked_orderposition.changed',
+                        data={
+                            'by_order': order.code,
+                            'linked_orderposition': pos.pk,
+                        }
+                    )
+
+        if not simulate:
+            for cp in delete_cps:
+                if cp.addon_to_id:
+                    continue
+                cp.addons.all().delete()
+                cp.delete()
 
         order.total = sum([p.price for p in pos_map.values()])
         fees = []
@@ -1512,6 +1626,7 @@ class InlineInvoiceLineSerializer(I18nAwareModelSerializer):
 
 
 class InvoiceSerializer(I18nAwareModelSerializer):
+    event = SlugRelatedField(slug_field='slug', read_only=True)
     order = serializers.SlugRelatedField(slug_field='code', read_only=True)
     refers = serializers.SlugRelatedField(slug_field='full_invoice_no', read_only=True)
     lines = InlineInvoiceLineSerializer(many=True)
@@ -1520,7 +1635,7 @@ class InvoiceSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = Invoice
-        fields = ('order', 'number', 'is_cancellation', 'invoice_from', 'invoice_from_name', 'invoice_from_zipcode',
+        fields = ('event', 'order', 'number', 'is_cancellation', 'invoice_from', 'invoice_from_name', 'invoice_from_zipcode',
                   'invoice_from_city', 'invoice_from_country', 'invoice_from_tax_id', 'invoice_from_vat_id',
                   'invoice_to', 'invoice_to_company', 'invoice_to_name', 'invoice_to_street', 'invoice_to_zipcode',
                   'invoice_to_city', 'invoice_to_state', 'invoice_to_country', 'invoice_to_vat_id', 'invoice_to_beneficiary',

src/pretix/api/serializers/organizer.py

@@ -94,6 +94,14 @@ class CustomerSerializer(I18nAwareModelSerializer):
             data['name_parts']['_scheme'] = self.context['request'].organizer.settings.name_scheme
         return data
 
+    def validate_email(self, value):
+        qs = Customer.objects.filter(organizer=self.context['organizer'], email__iexact=value)
+        if self.instance and self.instance.pk:
+            qs = qs.exclude(pk=self.instance.pk)
+        if qs.exists():
+            raise ValidationError(_("An account with this email address is already registered."))
+        return value
+
 
 class CustomerCreateSerializer(CustomerSerializer):
     send_email = serializers.BooleanField(default=False, required=False, allow_null=True)
@@ -392,6 +400,9 @@ class OrganizerSettingsSerializer(SettingsSerializer):
         'reusable_media_type_nfc_uid',
         'reusable_media_type_nfc_uid_autocreate_giftcard',
         'reusable_media_type_nfc_uid_autocreate_giftcard_currency',
+        'reusable_media_type_nfc_mf0aes',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard',
+        'reusable_media_type_nfc_mf0aes_autocreate_giftcard_currency',
     ]
 
     def __init__(self, *args, **kwargs):

src/pretix/api/serializers/voucher.py

@@ -24,10 +24,16 @@ from rest_framework.exceptions import ValidationError
 
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.base.models import Seat, Voucher
+from pretix.base.models.vouchers import generate_codes
 
 
 class VoucherListSerializer(serializers.ListSerializer):
     def create(self, validated_data):
+        vouchers_without_codes = [v for v in validated_data if not v.get('code')]
+
+        for voucher_data, code in zip(vouchers_without_codes, generate_codes(self.context['event'].organizer, num=len(vouchers_without_codes), prefix=None)):
+            voucher_data['code'] = code
+
         codes = set()
         seats = set()
         errs = []
@@ -94,8 +100,13 @@ class VoucherSerializer(I18nAwareModelSerializer):
         )
         if check_quota:
             Voucher.clean_quota_check(
-                full_data, 1, self.instance, self.context.get('event'),
-                full_data.get('quota'), full_data.get('item'), full_data.get('variation')
+                full_data,
+                full_data.get('max_usages', 1) - (self.instance.redeemed if self.instance else 0),
+                self.instance,
+                self.context.get('event'),
+                full_data.get('quota'),
+                full_data.get('item'),
+                full_data.get('variation')
             )
         Voucher.clean_voucher_code(full_data, self.context.get('event'), self.instance.pk if self.instance else None)
 

src/pretix/api/urls.py

@@ -61,6 +61,8 @@ orga_router.register(r'membershiptypes', organizer.MembershipTypeViewSet)
 orga_router.register(r'reusablemedia', media.ReusableMediaViewSet)
 orga_router.register(r'teams', organizer.TeamViewSet)
 orga_router.register(r'devices', organizer.DeviceViewSet)
+orga_router.register(r'orders', order.OrganizerOrderViewSet)
+orga_router.register(r'invoices', order.InvoiceViewSet)
 orga_router.register(r'exporters', exporters.OrganizerExportersViewSet, basename='exporters')
 
 team_router = routers.DefaultRouter()
@@ -77,7 +79,7 @@ event_router.register(r'questions', item.QuestionViewSet)
 event_router.register(r'discounts', discount.DiscountViewSet)
 event_router.register(r'quotas', item.QuotaViewSet)
 event_router.register(r'vouchers', voucher.VoucherViewSet)
-event_router.register(r'orders', order.OrderViewSet)
+event_router.register(r'orders', order.EventOrderViewSet)
 event_router.register(r'orderpositions', order.OrderPositionViewSet)
 event_router.register(r'invoices', order.InvoiceViewSet)
 event_router.register(r'revokedsecrets', order.RevokedSecretViewSet, basename='revokedsecrets')

src/pretix/api/views/cart.py

@@ -25,6 +25,7 @@ from typing import List
 from django.db import transaction
 from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
+from django.utils.timezone import now
 from django.utils.translation import gettext as _
 from rest_framework import status, viewsets
 from rest_framework.decorators import action
@@ -41,7 +42,7 @@ from pretix.base.models import CartPosition
 from pretix.base.services.cart import (
     _get_quota_availability, _get_voucher_availability, error_messages,
 )
-from pretix.base.services.locking import NoLockManager
+from pretix.base.services.locking import lock_objects
 
 
 class CartPositionViewSet(CreateModelMixin, DestroyModelMixin, viewsets.ReadOnlyModelViewSet):
@@ -150,12 +151,21 @@ class CartPositionViewSet(CreateModelMixin, DestroyModelMixin, viewsets.ReadOnly
                     quota_diff[q] += 1
 
         seats_seen = set()
+        now_dt = now()
+        with transaction.atomic():
+            full_lock_required = seat_diff and self.request.event.settings.seating_minimal_distance > 0
+            if full_lock_required:
+                # We lock the entire event in this case since we don't want to deal with fine-granular locking
+                # in the case of seating distance enforcement
+                lock_objects([self.request.event])
+            else:
+                lock_objects(
+                    [q for q, d in quota_diff.items() if q.size is not None and d > 0] +
+                    [v for v, d in voucher_use_diff.items() if d > 0] +
+                    [s for s, d in seat_diff.items() if d > 0],
+                    shared_lock_objects=[self.request.event]
+                )
 
-        lockfn = NoLockManager
-        if self._require_locking(quota_diff, voucher_use_diff, seat_diff):
-            lockfn = self.request.event.lock
-
-        with lockfn() as now_dt, transaction.atomic():
             vouchers_ok, vouchers_depend_on_cart = _get_voucher_availability(
                 self.request.event,
                 voucher_use_diff,

src/pretix/api/views/checkin.py

@@ -164,8 +164,21 @@ class CheckinListViewSet(viewsets.ModelViewSet):
                 secret=serializer.validated_data['raw_barcode']
             ).first()
 
+        clist = self.get_object()
+        if serializer.validated_data.get('nonce'):
+            if kwargs.get('position'):
+                prev = kwargs['position'].all_checkins.filter(nonce=serializer.validated_data['nonce']).first()
+            else:
+                prev = clist.checkins.filter(
+                    nonce=serializer.validated_data['nonce'],
+                    raw_barcode=serializer.validated_data['raw_barcode'],
+                ).first()
+            if prev:
+                # Ignore because nonce is already handled
+                return Response(serializer.data, status=201)
+
         c = serializer.save(
-            list=self.get_object(),
+            list=clist,
             successful=False,
             forced=True,
             force_sent=True,
@@ -265,6 +278,7 @@ with scopes_disabled():
 
         def __init__(self, *args, **kwargs):
             self.checkinlist = kwargs.pop('checkinlist')
+            self.gate = kwargs.pop('gate')
             super().__init__(*args, **kwargs)
 
         def has_checkin_qs(self, queryset, name, value):
@@ -274,7 +288,7 @@ with scopes_disabled():
             if not self.checkinlist.rules:
                 return queryset
             return queryset.filter(
-                SQLLogic(self.checkinlist).apply(self.checkinlist.rules)
+                SQLLogic(self.checkinlist, self.gate).apply(self.checkinlist.rules)
             ).filter(
                 Q(valid_from__isnull=True) | Q(valid_from__lte=now()),
                 Q(valid_until__isnull=True) | Q(valid_until__gte=now()),
@@ -396,7 +410,7 @@ def _checkin_list_position_queryset(checkinlists, ignore_status=False, ignore_pr
 
 def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force, checkin_type, ignore_unpaid, nonce,
                     untrusted_input, user, auth, expand, pdf_data, request, questions_supported, canceled_supported,
-                    source_type='barcode', legacy_url_support=False, simulate=False):
+                    source_type='barcode', legacy_url_support=False, simulate=False, gate=None):
     if not checkinlists:
         raise ValidationError('No check-in list passed.')
 
@@ -404,7 +418,7 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
     prefetch_related_objects([cl for cl in checkinlists if not cl.all_products], 'limit_products')
 
     device = auth if isinstance(auth, Device) else None
-    gate = auth.gate if isinstance(auth, Device) else None
+    gate = gate or (auth.gate if isinstance(auth, Device) else None)
 
     context = {
         'request': request,
@@ -659,6 +673,7 @@ def _redeem_process(*, checkinlists, raw_barcode, answers_data, datetime, force,
                 raw_source_type=source_type,
                 from_revoked_secret=from_revoked_secret,
                 simulate=simulate,
+                gate=gate,
             )
         except RequiredQuestionsError as e:
             return Response({
@@ -757,6 +772,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
     def get_filterset_kwargs(self):
         return {
             'checkinlist': self.checkinlist,
+            'gate': self.request.auth.gate if isinstance(self.request.auth, Device) else None,
         }
 
     @cached_property

src/pretix/api/views/device.py

@@ -19,8 +19,12 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
+import base64
 import logging
 
+from cryptography.hazmat.backends.openssl.backend import Backend
+from cryptography.hazmat.primitives.asymmetric import padding
+from cryptography.hazmat.primitives.serialization import load_pem_public_key
 from django.db.models import Exists, OuterRef, Q
 from django.db.models.functions import Coalesce
 from django.utils.timezone import now
@@ -34,6 +38,8 @@ from pretix.api.auth.device import DeviceTokenAuthentication
 from pretix.api.views.version import numeric_version
 from pretix.base.models import CheckinList, Device, SubEvent
 from pretix.base.models.devices import Gate, generate_api_token
+from pretix.base.models.media import MediumKeySet
+from pretix.base.services.media import get_keysets_for_organizer
 
 logger = logging.getLogger(__name__)
 
@@ -47,6 +53,17 @@ class InitializationRequestSerializer(serializers.Serializer):
     software_brand = serializers.CharField(max_length=190)
     software_version = serializers.CharField(max_length=190)
     info = serializers.JSONField(required=False, allow_null=True)
+    rsa_pubkey = serializers.CharField(required=False, allow_null=True)
+
+    def validate(self, attrs):
+        if attrs.get('rsa_pubkey'):
+            try:
+                load_pem_public_key(
+                    attrs['rsa_pubkey'].encode(), Backend()
+                )
+            except:
+                raise ValidationError({'rsa_pubkey': ['Not a valid public key.']})
+        return attrs
 
 
 class UpdateRequestSerializer(serializers.Serializer):
@@ -57,6 +74,47 @@ class UpdateRequestSerializer(serializers.Serializer):
     software_brand = serializers.CharField(max_length=190)
     software_version = serializers.CharField(max_length=190)
     info = serializers.JSONField(required=False, allow_null=True)
+    rsa_pubkey = serializers.CharField(required=False, allow_null=True)
+
+    def validate(self, attrs):
+        if attrs.get('rsa_pubkey'):
+            try:
+                load_pem_public_key(
+                    attrs['rsa_pubkey'].encode(), Backend()
+                )
+            except:
+                raise ValidationError({'rsa_pubkey': ['Not a valid public key.']})
+        return attrs
+
+
+class RSAEncryptedField(serializers.Field):
+    def to_representation(self, value):
+        public_key = load_pem_public_key(
+            self.context['device'].rsa_pubkey.encode(), Backend()
+        )
+        cipher_text = public_key.encrypt(
+            # RSA/ECB/PKCS1Padding
+            value,
+            padding.PKCS1v15()
+        )
+        return base64.b64encode(cipher_text).decode()
+
+
+class MediumKeySetSerializer(serializers.ModelSerializer):
+    uid_key = RSAEncryptedField(read_only=True)
+    diversification_key = RSAEncryptedField(read_only=True)
+    organizer = serializers.SlugRelatedField(slug_field='slug', read_only=True)
+
+    class Meta:
+        model = MediumKeySet
+        fields = [
+            'public_id',
+            'organizer',
+            'active',
+            'media_type',
+            'uid_key',
+            'diversification_key',
+        ]
 
 
 class GateSerializer(serializers.ModelSerializer):
@@ -108,6 +166,7 @@ class InitializeView(APIView):
         device.software_brand = serializer.validated_data.get('software_brand')
         device.software_version = serializer.validated_data.get('software_version')
         device.info = serializer.validated_data.get('info')
+        device.rsa_pubkey = serializer.validated_data.get('rsa_pubkey')
         device.api_token = generate_api_token()
         device.save()
 
@@ -130,6 +189,11 @@ class UpdateView(APIView):
         device.os_version = serializer.validated_data.get('os_version')
         device.software_brand = serializer.validated_data.get('software_brand')
         device.software_version = serializer.validated_data.get('software_version')
+        if serializer.validated_data.get('rsa_pubkey') and serializer.validated_data.get('rsa_pubkey') != device.rsa_pubkey:
+            if device.rsa_pubkey:
+                raise ValidationError({'rsa_pubkey': ['You cannot change the rsa_pubkey of the device once it is set.']})
+            else:
+                device.rsa_pubkey = serializer.validated_data.get('rsa_pubkey')
         device.info = serializer.validated_data.get('info')
         device.save()
         device.log_action('pretix.device.updated', data=serializer.validated_data, auth=device)
@@ -177,8 +241,12 @@ class InfoView(APIView):
                     'pretix': __version__,
                     'pretix_numeric': numeric_version(__version__),
                 }
-            }
-
+            },
+            'medium_key_sets': MediumKeySetSerializer(
+                get_keysets_for_organizer(device.organizer),
+                many=True,
+                context={'device': request.auth}
+            ).data if device.rsa_pubkey else []
         })
 
 

src/pretix/api/views/event.py

@@ -381,16 +381,29 @@ with scopes_disabled():
                 | Q(location__icontains=i18ncomp(value))
             )
 
+    class OrganizerSubEventFilter(SubEventFilter):
+        def search_qs(self, queryset, name, value):
+            return queryset.filter(
+                Q(name__icontains=i18ncomp(value))
+                | Q(event__slug__icontains=value)
+                | Q(location__icontains=i18ncomp(value))
+            )
+
 
 class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
     serializer_class = SubEventSerializer
     queryset = SubEvent.objects.none()
     write_permission = 'can_change_event_settings'
     filter_backends = (DjangoFilterBackend, TotalOrderingFilter)
-    filterset_class = SubEventFilter
     ordering = ('date_from',)
     ordering_fields = ('id', 'date_from', 'last_modified')
 
+    @property
+    def filterset_class(self):
+        if getattr(self.request, 'event', None):
+            return SubEventFilter
+        return OrganizerSubEventFilter
+
     def get_queryset(self):
         if getattr(self.request, 'event', None):
             qs = self.request.event.subevents
@@ -415,6 +428,7 @@ class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
             'subeventitem_set',
             'subeventitemvariation_set',
             'meta_values',
+            'meta_values__property',
             Prefetch(
                 'seat_category_mappings',
                 to_attr='_seat_category_mappings',

src/pretix/api/views/media.py

@@ -104,6 +104,12 @@ class ReusableMediaViewSet(viewsets.ModelViewSet):
             auth=self.request.auth,
             data=merge_dicts(self.request.data, {'id': inst.pk})
         )
+        mt = MEDIA_TYPES.get(serializer.validated_data["type"])
+        if mt:
+            m = mt.handle_new(self.request.organizer, inst, self.request.user, self.request.auth)
+            if m:
+                s = self.get_serializer(m)
+                return Response({"result": s.data})
 
     @transaction.atomic()
     def perform_update(self, serializer):

src/pretix/api/views/order.py

@@ -26,6 +26,7 @@ from decimal import Decimal
 from zoneinfo import ZoneInfo
 
 import django_filters
+from django.conf import settings
 from django.db import transaction
 from django.db.models import (
     Exists, F, OuterRef, Prefetch, Q, Subquery, prefetch_related_objects,
@@ -44,6 +45,7 @@ from rest_framework.exceptions import (
     APIException, NotFound, PermissionDenied, ValidationError,
 )
 from rest_framework.mixins import CreateModelMixin
+from rest_framework.permissions import SAFE_METHODS
 from rest_framework.response import Response
 
 from pretix.api.models import OAuthAccessToken
@@ -108,19 +110,24 @@ with scopes_disabled():
         item = django_filters.CharFilter(field_name='all_positions', lookup_expr='item_id', distinct=True)
         variation = django_filters.CharFilter(field_name='all_positions', lookup_expr='variation_id', distinct=True)
         subevent = django_filters.CharFilter(field_name='all_positions', lookup_expr='subevent_id', distinct=True)
+        customer = django_filters.CharFilter(field_name='customer__identifier')
 
         class Meta:
             model = Order
-            fields = ['code', 'status', 'email', 'locale', 'testmode', 'require_approval']
+            fields = ['code', 'status', 'email', 'locale', 'testmode', 'require_approval', 'customer']
 
         @scopes_disabled()
         def subevent_after_qs(self, qs, name, value):
+            if getattr(self.request, 'event', None):
+                subevents = self.request.event.subevents
+            else:
+                subevents = SubEvent.objects.filter(event__organizer=self.request.organizer)
+
             qs = qs.filter(
                 pk__in=Subquery(
                     OrderPosition.all.filter(
-                        subevent_id__in=SubEvent.objects.filter(
+                        subevent_id__in=subevents.filter(
                             Q(date_to__gt=value) | Q(date_from__gt=value, date_to__isnull=True),
-                            event=self.request.event
                         ).values_list('id'),
                     ).values_list('order_id')
                 )
@@ -128,12 +135,16 @@ with scopes_disabled():
             return qs
 
         def subevent_before_qs(self, qs, name, value):
+            if getattr(self.request, 'event', None):
+                subevents = self.request.event.subevents
+            else:
+                subevents = SubEvent.objects.filter(event__organizer=self.request.organizer)
+
             qs = qs.filter(
                 pk__in=Subquery(
                     OrderPosition.all.filter(
-                        subevent_id__in=SubEvent.objects.filter(
+                        subevent_id__in=subevents.filter(
                             Q(date_from__lt=value),
-                            event=self.request.event
                         ).values_list('id'),
                     ).values_list('order_id')
                 )
@@ -185,7 +196,7 @@ with scopes_disabled():
             )
 
 
-class OrderViewSet(viewsets.ModelViewSet):
+class OrderViewSetMixin:
     serializer_class = OrderSerializer
     queryset = Order.objects.none()
     filter_backends = (DjangoFilterBackend, TotalOrderingFilter)
@@ -193,19 +204,12 @@ class OrderViewSet(viewsets.ModelViewSet):
     ordering_fields = ('datetime', 'code', 'status', 'last_modified')
     filterset_class = OrderFilter
     lookup_field = 'code'
-    permission = 'can_view_orders'
-    write_permission = 'can_change_orders'
 
-    def get_serializer_context(self):
-        ctx = super().get_serializer_context()
-        ctx['event'] = self.request.event
-        ctx['pdf_data'] = self.request.query_params.get('pdf_data', 'false') == 'true'
-        ctx['exclude'] = self.request.query_params.getlist('exclude')
-        ctx['include'] = self.request.query_params.getlist('include')
-        return ctx
+    def get_base_queryset(self):
+        raise NotImplementedError()
 
     def get_queryset(self):
-        qs = self.request.event.orders
+        qs = self.get_base_queryset()
         if 'fees' not in self.request.GET.getlist('exclude'):
             if self.request.query_params.get('include_canceled_fees', 'false') == 'true':
                 fqs = OrderFee.all
@@ -227,11 +231,12 @@ class OrderViewSet(viewsets.ModelViewSet):
             opq = OrderPosition.all
         else:
             opq = OrderPosition.objects
-        if request.query_params.get('pdf_data', 'false') == 'true':
+        if request.query_params.get('pdf_data', 'false') == 'true' and getattr(request, 'event', None):
             prefetch_related_objects([request.organizer], 'meta_properties')
             prefetch_related_objects(
                 [request.event],
-                Prefetch('meta_values', queryset=EventMetaValue.objects.select_related('property'), to_attr='meta_values_cached'),
+                Prefetch('meta_values', queryset=EventMetaValue.objects.select_related('property'),
+                         to_attr='meta_values_cached'),
                 'questions',
                 'item_meta_properties',
             )
@@ -266,13 +271,12 @@ class OrderViewSet(viewsets.ModelViewSet):
                 )
             )
 
-    def _get_output_provider(self, identifier):
-        responses = register_ticket_outputs.send(self.request.event)
-        for receiver, response in responses:
-            prov = response(self.request.event)
-            if prov.identifier == identifier:
-                return prov
-        raise NotFound('Unknown output provider.')
+    def get_serializer_context(self):
+        ctx = super().get_serializer_context()
+        ctx['exclude'] = self.request.query_params.getlist('exclude')
+        ctx['include'] = self.request.query_params.getlist('include')
+        ctx['pdf_data'] = False
+        return ctx
 
     @scopes_disabled()  # we are sure enough that get_queryset() is correct, so we save some perforamnce
     def list(self, request, **kwargs):
@@ -289,6 +293,45 @@ class OrderViewSet(viewsets.ModelViewSet):
         serializer = self.get_serializer(queryset, many=True)
         return Response(serializer.data, headers={'X-Page-Generated': date})
 
+
+class OrganizerOrderViewSet(OrderViewSetMixin, viewsets.ReadOnlyModelViewSet):
+    def get_base_queryset(self):
+        perm = "can_view_orders" if self.request.method in SAFE_METHODS else "can_change_orders"
+        if isinstance(self.request.auth, (TeamAPIToken, Device)):
+            return Order.objects.filter(
+                event__organizer=self.request.organizer,
+                event__in=self.request.auth.get_events_with_permission(perm, request=self.request)
+            )
+        elif self.request.user.is_authenticated:
+            return Order.objects.filter(
+                event__organizer=self.request.organizer,
+                event__in=self.request.user.get_events_with_permission(perm, request=self.request)
+            )
+        else:
+            raise PermissionDenied()
+
+
+class EventOrderViewSet(OrderViewSetMixin, viewsets.ModelViewSet):
+    permission = 'can_view_orders'
+    write_permission = 'can_change_orders'
+
+    def get_serializer_context(self):
+        ctx = super().get_serializer_context()
+        ctx['event'] = self.request.event
+        ctx['pdf_data'] = self.request.query_params.get('pdf_data', 'false') == 'true'
+        return ctx
+
+    def get_base_queryset(self):
+        return self.request.event.orders
+
+    def _get_output_provider(self, identifier):
+        responses = register_ticket_outputs.send(self.request.event)
+        for receiver, response in responses:
+            prov = response(self.request.event)
+            if prov.identifier == identifier:
+                return prov
+        raise NotFound('Unknown output provider.')
+
     @action(detail=True, url_name='download', url_path='download/(?P<output>[^/]+)')
     def download(self, request, output, **kwargs):
         provider = self._get_output_provider(output)
@@ -1191,7 +1234,7 @@ class OrderPositionViewSet(viewsets.ModelViewSet):
             ftype, ignored = mimetypes.guess_type(image_file.name)
             extension = os.path.basename(image_file.name).split('.')[-1]
         else:
-            img = Image.open(image_file)
+            img = Image.open(image_file, formats=settings.PILLOW_FORMATS_QUESTIONS_IMAGE)
             ftype = Image.MIME[img.format]
             extensions = {
                 'GIF': 'gif', 'TIFF': 'tif', 'BMP': 'bmp', 'JPEG': 'jpg', 'PNG': 'png'
@@ -1782,11 +1825,24 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
     write_permission = 'can_change_orders'
 
     def get_queryset(self):
-        return self.request.event.invoices.prefetch_related('lines').select_related('order', 'refers').annotate(
+        perm = "can_view_orders" if self.request.method in SAFE_METHODS else "can_change_orders"
+        if getattr(self.request, 'event', None):
+            qs = self.request.event.invoices
+        elif isinstance(self.request.auth, (TeamAPIToken, Device)):
+            qs = Invoice.objects.filter(
+                event__organizer=self.request.organizer,
+                event__in=self.request.auth.get_events_with_permission(perm, request=self.request)
+            )
+        elif self.request.user.is_authenticated:
+            qs = Invoice.objects.filter(
+                event__organizer=self.request.organizer,
+                event__in=self.request.user.get_events_with_permission(perm, request=self.request)
+            )
+        return qs.prefetch_related('lines').select_related('order', 'refers').annotate(
             nr=Concat('prefix', 'invoice_no')
         )
 
-    @action(detail=True, )
+    @action(detail=True)
     def download(self, request, **kwargs):
         invoice = self.get_object()
 
@@ -1805,7 +1861,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
         return resp
 
     @action(detail=True, methods=['POST'])
-    def regenerate(self, request, **kwarts):
+    def regenerate(self, request, **kwargs):
         inv = self.get_object()
         if inv.canceled:
             raise ValidationError('The invoice has already been canceled.')
@@ -1815,7 +1871,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
             raise PermissionDenied('The invoice file is no longer stored on the server.')
         elif inv.sent_to_organizer:
             raise PermissionDenied('The invoice file has already been exported.')
-        elif now().astimezone(self.request.event.timezone).date() - inv.date > datetime.timedelta(days=1):
+        elif now().astimezone(inv.event.timezone).date() - inv.date > datetime.timedelta(days=1):
             raise PermissionDenied('The invoice file is too old to be regenerated.')
         else:
             inv = regenerate_invoice(inv)
@@ -1830,7 +1886,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
             return Response(status=204)
 
     @action(detail=True, methods=['POST'])
-    def reissue(self, request, **kwarts):
+    def reissue(self, request, **kwargs):
         inv = self.get_object()
         if inv.canceled:
             raise ValidationError('The invoice has already been canceled.')

src/pretix/api/views/organizer.py

@@ -24,6 +24,8 @@ from decimal import Decimal
 import django_filters
 from django.contrib.auth.hashers import make_password
 from django.db import transaction
+from django.db.models import OuterRef, Subquery, Sum
+from django.db.models.functions import Coalesce
 from django.shortcuts import get_object_or_404
 from django.utils.functional import cached_property
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
@@ -155,8 +157,13 @@ class GiftCardViewSet(viewsets.ModelViewSet):
             qs = self.request.organizer.accepted_gift_cards
         else:
             qs = self.request.organizer.issued_gift_cards.all()
+        s = GiftCardTransaction.objects.filter(
+            card=OuterRef('pk')
+        ).order_by().values('card').annotate(s=Sum('value')).values('s')
         return qs.prefetch_related(
             'issuer'
+        ).annotate(
+            cached_value=Coalesce(Subquery(s), Decimal('0.00'))
         )
 
     def get_serializer_context(self):

src/pretix/api/views/voucher.py

@@ -19,8 +19,6 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-import contextlib
-
 from django.db import transaction
 from django.db.models import F, Q
 from django.utils.timezone import now
@@ -69,30 +67,9 @@ class VoucherViewSet(viewsets.ModelViewSet):
     def get_queryset(self):
         return self.request.event.vouchers.select_related('seat').all()
 
-    def _predict_quota_check(self, data, instance):
-        # This method predicts if Voucher.clean_quota_needs_checking
-        # *migh* later require a quota check. It is only approximate
-        # and returns True a little too often. The point is to avoid
-        # locks when we know we won't need them.
-        if 'allow_ignore_quota' in data and data.get('allow_ignore_quota'):
-            return False
-        if instance and 'allow_ignore_quota' not in data and instance.allow_ignore_quota:
-            return False
-
-        if 'block_quota' in data and not data.get('block_quota'):
-            return False
-        if instance and 'block_quota' not in data and not instance.block_quota:
-            return False
-
-        return True
-
+    @transaction.atomic()
     def create(self, request, *args, **kwargs):
-        if self._predict_quota_check(request.data, None):
-            lockfn = request.event.lock
-        else:
-            lockfn = contextlib.suppress  # noop context manager
-        with lockfn():
-            return super().create(request, *args, **kwargs)
+        return super().create(request, *args, **kwargs)
 
     def perform_create(self, serializer):
         serializer.save(event=self.request.event)
@@ -108,13 +85,9 @@ class VoucherViewSet(viewsets.ModelViewSet):
         ctx['event'] = self.request.event
         return ctx
 
+    @transaction.atomic()
     def update(self, request, *args, **kwargs):
-        if self._predict_quota_check(request.data, self.get_object()):
-            lockfn = request.event.lock
-        else:
-            lockfn = contextlib.suppress  # noop context manager
-        with lockfn():
-            return super().update(request, *args, **kwargs)
+        return super().update(request, *args, **kwargs)
 
     def perform_update(self, serializer):
         serializer.save(event=self.request.event)
@@ -140,22 +113,18 @@ class VoucherViewSet(viewsets.ModelViewSet):
             super().perform_destroy(instance)
 
     @action(detail=False, methods=['POST'])
+    @transaction.atomic()
     def batch_create(self, request, *args, **kwargs):
-        if any(self._predict_quota_check(d, None) for d in request.data):
-            lockfn = request.event.lock
-        else:
-            lockfn = contextlib.suppress  # noop context manager
-        with lockfn():
-            serializer = self.get_serializer(data=request.data, many=True)
-            serializer.is_valid(raise_exception=True)
-            with transaction.atomic():
-                serializer.save(event=self.request.event)
-                for i, v in enumerate(serializer.instance):
-                    v.log_action(
-                        'pretix.voucher.added',
-                        user=self.request.user,
-                        auth=self.request.auth,
-                        data=self.request.data[i]
-                    )
+        serializer = self.get_serializer(data=request.data, many=True)
+        serializer.is_valid(raise_exception=True)
+        with transaction.atomic():
+            serializer.save(event=self.request.event)
+            for i, v in enumerate(serializer.instance):
+                v.log_action(
+                    'pretix.voucher.added',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data=self.request.data[i]
+                )
         headers = self.get_success_headers(serializer.data)
         return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

src/pretix/api/webhooks.py

@@ -202,6 +202,21 @@ class ParametrizedWaitingListEntryWebhookEvent(ParametrizedWebhookEvent):
         }
 
 
+class ParametrizedCustomerWebhookEvent(ParametrizedWebhookEvent):
+
+    def build_payload(self, logentry: LogEntry):
+        customer = logentry.content_object
+        if not customer:
+            return None
+
+        return {
+            'notification_id': logentry.pk,
+            'organizer': customer.organizer.slug,
+            'customer': customer.identifier,
+            'action': logentry.action_type,
+        }
+
+
 @receiver(register_webhook_events, dispatch_uid="base_register_default_webhook_events")
 def register_default_webhook_events(sender, **kwargs):
     return (
@@ -350,6 +365,18 @@ def register_default_webhook_events(sender, **kwargs):
             'pretix.event.orders.waitinglist.voucher_assigned',
             _('Waiting list entry received voucher'),
         ),
+        ParametrizedCustomerWebhookEvent(
+            'pretix.customer.created',
+            _('Customer account created'),
+        ),
+        ParametrizedCustomerWebhookEvent(
+            'pretix.customer.changed',
+            _('Customer account changed'),
+        ),
+        ParametrizedCustomerWebhookEvent(
+            'pretix.customer.anonymized',
+            _('Customer account anonymized'),
+        ),
     )
 
 

src/pretix/base/cache.py

@@ -62,27 +62,27 @@ class NamespacedCache:
             prefix = int(time.time())
             self.cache.set(self.prefixkey, prefix)
 
-    def set(self, key: str, value: str, timeout: int=300):
+    def set(self, key: str, value: any, timeout: int=300):
         return self.cache.set(self._prefix_key(key), value, timeout)
 
-    def get(self, key: str) -> str:
+    def get(self, key: str) -> any:
         return self.cache.get(self._prefix_key(key, known_prefix=self._last_prefix))
 
-    def get_or_set(self, key: str, default: Callable, timeout=300) -> str:
+    def get_or_set(self, key: str, default: Callable, timeout=300) -> any:
         return self.cache.get_or_set(
             self._prefix_key(key, known_prefix=self._last_prefix),
             default=default,
             timeout=timeout
         )
 
-    def get_many(self, keys: List[str]) -> Dict[str, str]:
+    def get_many(self, keys: List[str]) -> Dict[str, any]:
         values = self.cache.get_many([self._prefix_key(key) for key in keys])
         newvalues = {}
         for k, v in values.items():
             newvalues[self._strip_prefix(k)] = v
         return newvalues
 
-    def set_many(self, values: Dict[str, str], timeout=300):
+    def set_many(self, values: Dict[str, any], timeout=300):
         newvalues = {}
         for k, v in values.items():
             newvalues[self._prefix_key(k)] = v

src/pretix/base/email.py

@@ -134,8 +134,11 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
     def template_name(self):
         raise NotImplementedError()
 
+    def compile_markdown(self, plaintext):
+        return markdown_compile_email(plaintext)
+
     def render(self, plain_body: str, plain_signature: str, subject: str, order, position) -> str:
-        body_md = markdown_compile_email(plain_body)
+        body_md = self.compile_markdown(plain_body)
         htmlctx = {
             'site': settings.PRETIX_INSTANCE_NAME,
             'site_url': settings.SITE_URL,
@@ -153,7 +156,7 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
 
         if plain_signature:
             signature_md = plain_signature.replace('\n', '<br>\n')
-            signature_md = markdown_compile_email(signature_md)
+            signature_md = self.compile_markdown(signature_md)
             htmlctx['signature'] = signature_md
 
         if order:
@@ -666,6 +669,11 @@ def base_placeholders(sender, **kwargs):
         lambda waiting_list_entry: concatenation_for_salutation(waiting_list_entry.name_parts),
         _("Mr Doe"),
     ))
+    ph.append(SimpleFunctionalMailTextPlaceholder(
+        "name", ["waiting_list_entry"],
+        lambda waiting_list_entry: waiting_list_entry.name or "",
+        _("Mr Doe"),
+    ))
     ph.append(SimpleFunctionalMailTextPlaceholder(
         "name_for_salutation", ["position_or_address"],
         lambda position_or_address: concatenation_for_salutation(get_best_name(position_or_address, parts=True)),

src/pretix/base/exporters/orderlist.py

@@ -549,7 +549,9 @@ class OrderListExporter(MultiSheetListExporter):
             headers.append(_('End date'))
         headers += [
             _('Product'),
+            _('Product ID'),
             _('Variation'),
+            _('Variation ID'),
             _('Price'),
             _('Tax rate'),
             _('Tax rule'),
@@ -656,7 +658,9 @@ class OrderListExporter(MultiSheetListExporter):
                         row.append('')
                 row += [
                     str(op.item),
+                    str(op.item_id),
                     str(op.variation) if op.variation else '',
+                    str(op.variation_id) if op.variation_id else '',
                     op.price,
                     op.tax_rate,
                     str(op.tax_rule) if op.tax_rule else '',

src/pretix/base/forms/questions.py

@@ -500,14 +500,14 @@ class PortraitImageField(SizeValidationMixin, ExtValidationMixin, forms.FileFiel
                 file = BytesIO(data['content'])
 
         try:
-            image = Image.open(file)
+            image = Image.open(file, formats=settings.PILLOW_FORMATS_QUESTIONS_IMAGE)
             # verify() must be called immediately after the constructor.
             image.verify()
 
             # We want to do more than just verify(), so we need to re-open the file
             if hasattr(file, 'seek'):
                 file.seek(0)
-            image = Image.open(file)
+            image = Image.open(file, formats=settings.PILLOW_FORMATS_QUESTIONS_IMAGE)
 
             # load() is a potential DoS vector (see Django bug #18520), so we verify the size first
             if image.width > 10_000 or image.height > 10_000:
@@ -566,7 +566,7 @@ class PortraitImageField(SizeValidationMixin, ExtValidationMixin, forms.FileFiel
         return f
 
     def __init__(self, *args, **kwargs):
-        kwargs.setdefault('ext_whitelist', (".png", ".jpg", ".jpeg", ".jfif", ".tif", ".tiff", ".bmp"))
+        kwargs.setdefault('ext_whitelist', settings.FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE)
         kwargs.setdefault('max_size', settings.FILE_UPLOAD_MAX_SIZE_IMAGE)
         super().__init__(*args, **kwargs)
 
@@ -826,11 +826,7 @@ class BaseQuestionsForm(forms.Form):
                         help_text=help_text,
                         initial=initial.file if initial else None,
                         widget=UploadedFileWidget(position=pos, event=event, answer=initial),
-                        ext_whitelist=(
-                            ".png", ".jpg", ".gif", ".jpeg", ".pdf", ".txt", ".docx", ".gif", ".svg",
-                            ".pptx", ".ppt", ".doc", ".xlsx", ".xls", ".jfif", ".heic", ".heif", ".pages",
-                            ".bmp", ".tif", ".tiff"
-                        ),
+                        ext_whitelist=settings.FILE_UPLOAD_EXTENSIONS_OTHER,
                         max_size=settings.FILE_UPLOAD_MAX_SIZE_OTHER,
                     )
             elif q.type == Question.TYPE_DATE:

src/pretix/base/forms/widgets.py

@@ -60,6 +60,18 @@ def replace_arabic_numbers(inp):
     return inp.translate(table)
 
 
+def format_placeholders_help_text(placeholders, event=None):
+    placeholders = [(k, v.render_sample(event) if event else v) for k, v in placeholders.items()]
+    placeholders.sort(key=lambda x: x[0])
+    phs = [
+        '<button type="button" class="content-placeholder" title="%s">{%s}</button>' % (_("Sample: %s") % v if v else "", k)
+        for k, v in placeholders
+    ]
+    return _('Available placeholders: {list}').format(
+        list=' '.join(phs)
+    )
+
+
 class DatePickerWidget(forms.DateInput):
     def __init__(self, attrs=None, date_format=None):
         attrs = attrs or {}

src/pretix/base/media.py

@@ -49,6 +49,9 @@ class BaseMediaType:
     def handle_unknown(self, organizer, identifier, user, auth):
         pass
 
+    def handle_new(self, organizer, medium, user, auth):
+        pass
+
     def __str__(self):
         return str(self.verbose_name)
 
@@ -108,9 +111,43 @@ class NfcUidMediaType(BaseMediaType):
                 return m
 
 
+class NfcMf0aesMediaType(BaseMediaType):
+    identifier = 'nfc_mf0aes'
+    verbose_name = 'NFC Mifare Ultralight AES'
+    medium_created_by_server = False
+    supports_giftcard = True
+    supports_orderposition = False
+
+    def handle_new(self, organizer, medium, user, auth):
+        from pretix.base.models import GiftCard
+
+        if organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard', as_type=bool):
+            with transaction.atomic():
+                gc = GiftCard.objects.create(
+                    issuer=organizer,
+                    expires=organizer.default_gift_card_expiry,
+                    currency=organizer.settings.get(f'reusable_media_type_{self.identifier}_autocreate_giftcard_currency'),
+                )
+                medium.linked_giftcard = gc
+                medium.save()
+                medium.log_action(
+                    'pretix.reusable_medium.linked_giftcard.changed',
+                    user=user, auth=auth,
+                    data={
+                        'linked_giftcard': gc.pk
+                    }
+                )
+                gc.log_action(
+                    'pretix.giftcards.created',
+                    user=user, auth=auth,
+                )
+                return medium
+
+
 MEDIA_TYPES = {
     m.identifier: m for m in [
         BarcodePlainMediaType(),
         NfcUidMediaType(),
+        NfcMf0aesMediaType(),
     ]
 }

src/pretix/base/metrics.py

@@ -264,7 +264,7 @@ def metric_values():
 
     # Metrics from redis
     if settings.HAS_REDIS:
-        for key, value in redis.hscan_iter(REDIS_KEY):
+        for key, value in redis.hscan_iter(REDIS_KEY, count=1000):
             dkey = key.decode("utf-8")
             splitted = dkey.split("{", 2)
             value = float(value.decode("utf-8"))

src/pretix/base/middleware.py

@@ -271,6 +271,8 @@ class SecurityMiddleware(MiddlewareMixin):
                 (url.url_name == "event.checkout" and url.kwargs['step'] == "payment")
         ):
             h['script-src'].append('https://pay.google.com')
+            h['frame-src'].append('https://pay.google.com')
+            h['connect-src'].append('https://google.com/pay')
         if settings.LOG_CSP:
             h['report-uri'] = ["/csp_report/"]
         if 'Content-Security-Policy' in resp:

src/pretix/base/migrations/0001_initial.py

@@ -10,6 +10,7 @@ def initial_user(apps, schema_editor):
     user = User(email='admin@localhost')
     user.is_staff = True
     user.is_superuser = True
+    user.needs_password_change = True
     user.password = make_password('admin')
     user.save()
 

src/pretix/base/migrations/0244_mediumkeyset.py

@@ -0,0 +1,35 @@
+# Generated by Django 3.2.18 on 2023-05-17 11:32
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0243_device_os_name_and_os_version'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='device',
+            name='rsa_pubkey',
+            field=models.TextField(null=True),
+        ),
+        migrations.CreateModel(
+            name='MediumKeySet',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('public_id', models.BigIntegerField(unique=True)),
+                ('media_type', models.CharField(max_length=100)),
+                ('active', models.BooleanField(default=True)),
+                ('uid_key', models.BinaryField()),
+                ('diversification_key', models.BinaryField()),
+                ('organizer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='medium_key_sets', to='pretixbase.organizer')),
+            ],
+        ),
+        migrations.AddConstraint(
+            model_name='mediumkeyset',
+            constraint=models.UniqueConstraint(condition=models.Q(('active', True)), fields=('organizer', 'media_type'), name='keyset_unique_active'),
+        ),
+    ]

src/pretix/base/migrations/0245_discount_benefit_products.py

@@ -0,0 +1,34 @@
+# Generated by Django 4.2.4 on 2023-08-28 12:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pretixbase", "0244_mediumkeyset"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="discount",
+            name="benefit_apply_to_addons",
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name="discount",
+            name="benefit_ignore_voucher_discounted",
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AddField(
+            model_name="discount",
+            name="benefit_limit_products",
+            field=models.ManyToManyField(
+                related_name="benefit_discounts", to="pretixbase.item"
+            ),
+        ),
+        migrations.AddField(
+            model_name="discount",
+            name="benefit_same_products",
+            field=models.BooleanField(default=True),
+        ),
+    ]

src/pretix/base/migrations/0246_bigint.py

@@ -0,0 +1,509 @@
+# Generated by Django 4.2.4 on 2023-09-26 12:01
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pretixbase", "0245_discount_benefit_products"),
+    ]
+
+    operations = [
+        migrations.RenameIndex(
+            model_name="logentry",
+            new_name="pretixbase__datetim_b1fe5a_idx",
+            old_fields=("datetime", "id"),
+        ),
+        migrations.RenameIndex(
+            model_name="order",
+            new_name="pretixbase__datetim_66aff0_idx",
+            old_fields=("datetime", "id"),
+        ),
+        migrations.RenameIndex(
+            model_name="order",
+            new_name="pretixbase__last_mo_4ebf8b_idx",
+            old_fields=("last_modified", "id"),
+        ),
+        migrations.RenameIndex(
+            model_name="reusablemedium",
+            new_name="pretixbase__updated_093277_idx",
+            old_fields=("updated", "id"),
+        ),
+        migrations.RenameIndex(
+            model_name="transaction",
+            new_name="pretixbase__datetim_b20405_idx",
+            old_fields=("datetime", "id"),
+        ),
+        migrations.AlterField(
+            model_name="attendeeprofile",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="blockedticketsecret",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="cachedcombinedticket",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="cachedticket",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="cancellationrequest",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="cartposition",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="checkin",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="checkinlist",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="customer",
+            name="locale",
+            field=models.CharField(default="de", max_length=50),
+        ),
+        migrations.AlterField(
+            model_name="device",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="discount",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="event",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="event_settingsstore",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="eventfooterlink",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="eventmetaproperty",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="eventmetavalue",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="exchangerate",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="gate",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="giftcard",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="giftcardacceptance",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="giftcardtransaction",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="globalsettingsobject_settingsstore",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="invoice",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="invoiceaddress",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="invoiceline",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="item",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemaddon",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itembundle",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemcategory",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemmetaproperty",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemmetavalue",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemvariation",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="itemvariationmetavalue",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="logentry",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="mediumkeyset",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="notificationsetting",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="order",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderfee",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderpayment",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderposition",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderrefund",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="organizer",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="organizer_settingsstore",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="organizerfooterlink",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="question",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="questionanswer",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="questionoption",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="quota",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="revokedticketsecret",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="seat",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="seatcategorymapping",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="seatingplan",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="staffsession",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="staffsessionauditlog",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subevent",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subeventitem",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subeventitemvariation",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subeventmetavalue",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="taxrule",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="team",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="teamapitoken",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="teaminvite",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="u2fdevice",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="user",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="user",
+            name="locale",
+            field=models.CharField(default="de", max_length=50),
+        ),
+        migrations.AlterField(
+            model_name="voucher",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="waitinglistentry",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+        migrations.AlterField(
+            model_name="webauthndevice",
+            name="id",
+            field=models.BigAutoField(
+                auto_created=True, primary_key=True, serialize=False
+            ),
+        ),
+    ]

src/pretix/base/migrations/0247_checkinlist.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.2.4 on 2023-09-06 11:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pretixbase", "0246_bigint"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="checkinlist",
+            name="consider_tickets_used",
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name="checkinlist",
+            name="ignore_in_statistics",
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/models/_transactions.py

@@ -97,7 +97,7 @@ def _transactions_mark_order_dirty(order_id, using=None):
     if getattr(dirty_transactions, 'order_ids', None) is None:
         dirty_transactions.order_ids = set()
 
-    if _check_for_dirty_orders not in [func for savepoint_id, func in conn.run_on_commit]:
+    if _check_for_dirty_orders not in [func for (savepoint_id, func, *__) in conn.run_on_commit]:
         transaction.on_commit(_check_for_dirty_orders, using)
         dirty_transactions.order_ids.clear()  # This is necessary to clean up after old threads with rollbacked transactions
 

src/pretix/base/models/checkin.py

@@ -62,6 +62,16 @@ class CheckinList(LoggedModel):
                                              'and valid for check-in regardless of which date they are purchased for. '
                                              'You can limit their validity through the advanced check-in rules, '
                                              'though.'))
+    ignore_in_statistics = models.BooleanField(
+        verbose_name=pgettext_lazy('checkin', 'Ignore check-ins on this list in statistics'),
+        default=False
+    )
+    consider_tickets_used = models.BooleanField(
+        verbose_name=pgettext_lazy('checkin', 'Tickets with a check-in on this list should be considered "used"'),
+        help_text=_('This is relevant in various situations, e.g. for deciding if a ticket can still be canceled by '
+                    'the customer.'),
+        default=True
+    )
     include_pending = models.BooleanField(verbose_name=pgettext_lazy('checkin', 'Include pending orders'),
                                           default=False,
                                           help_text=_('With this option, people will be able to check in even if the '
@@ -265,16 +275,16 @@ class CheckinList(LoggedModel):
         # * in pretix.helpers.jsonlogic_boolalg
         # * in checkinrules.js
         # * in libpretixsync
-        # * in pretixscan-ios (in the future)
+        # * in pretixscan-ios
         top_level_operators = {
             '<', '<=', '>', '>=', '==', '!=', 'inList', 'isBefore', 'isAfter', 'or', 'and'
         }
         allowed_operators = top_level_operators | {
-            'buildTime', 'objectList', 'lookup', 'var',
+            'buildTime', 'objectList', 'lookup', 'var', 'entries_since', 'entries_before'
         }
         allowed_vars = {
             'product', 'variation', 'now', 'now_isoweekday', 'entries_number', 'entries_today', 'entries_days',
-            'minutes_since_last_entry', 'minutes_since_first_entry',
+            'minutes_since_last_entry', 'minutes_since_first_entry', 'gate',
         }
         if not rules or not isinstance(rules, dict):
             return rules
@@ -299,6 +309,10 @@ class CheckinList(LoggedModel):
                 raise ValidationError(f'Logic variable "{values[0]}" is currently not allowed.')
             return rules
 
+        if operator in ('entries_since', 'entries_before'):
+            if len(values) != 1 or "buildTime" not in values[0]:
+                raise ValidationError(f'Operator "{operator}" takes exactly one "buildTime" argument.')
+
         if operator in ('or', 'and') and seen_nonbool:
             raise ValidationError('You cannot use OR/AND logic on a level below a comparison operator.')
 

src/pretix/base/models/devices.py

@@ -166,6 +166,10 @@ class Device(LoggedModel):
         null=True,
         blank=False
     )
+    rsa_pubkey = models.TextField(
+        null=True,
+        blank=True,
+    )
     info = models.JSONField(
         null=True, blank=True,
     )

src/pretix/base/models/discount.py

@@ -99,7 +99,7 @@ class Discount(LoggedModel):
     )
     condition_apply_to_addons = models.BooleanField(
         default=True,
-        verbose_name=_("Apply to add-on products"),
+        verbose_name=_("Count add-on products"),
         help_text=_("Discounts never apply to bundled products"),
     )
     condition_ignore_voucher_discounted = models.BooleanField(
@@ -107,7 +107,7 @@ class Discount(LoggedModel):
         verbose_name=_("Ignore products discounted by a voucher"),
         help_text=_("If this option is checked, products that already received a discount through a voucher will not "
                     "be considered for this discount. However, products that use a voucher only to e.g. unlock a "
-                    "hidden product or gain access to sold-out quota will still receive the discount."),
+                    "hidden product or gain access to sold-out quota will still be considered."),
     )
     condition_min_count = models.PositiveIntegerField(
         verbose_name=_('Minimum number of matching products'),
@@ -120,6 +120,19 @@ class Discount(LoggedModel):
         default=Decimal('0.00'),
     )
 
+    benefit_same_products = models.BooleanField(
+        default=True,
+        verbose_name=_("Apply discount to same set of products"),
+        help_text=_("By default, the discount is applied across the same selection of products than the condition for "
+                    "the discount given above. If you want, you can however also select a different selection of "
+                    "products.")
+    )
+    benefit_limit_products = models.ManyToManyField(
+        'Item',
+        verbose_name=_("Apply discount to specific products"),
+        related_name='benefit_discounts',
+        blank=True
+    )
     benefit_discount_matching_percent = models.DecimalField(
         verbose_name=_('Percentual discount on matching products'),
         decimal_places=2,
@@ -139,6 +152,18 @@ class Discount(LoggedModel):
         blank=True,
         validators=[MinValueValidator(1)],
     )
+    benefit_apply_to_addons = models.BooleanField(
+        default=True,
+        verbose_name=_("Apply to add-on products"),
+        help_text=_("Discounts never apply to bundled products"),
+    )
+    benefit_ignore_voucher_discounted = models.BooleanField(
+        default=False,
+        verbose_name=_("Ignore products discounted by a voucher"),
+        help_text=_("If this option is checked, products that already received a discount through a voucher will not "
+                    "be discounted. However, products that use a voucher only to e.g. unlock a hidden product or gain "
+                    "access to sold-out quota will still receive the discount."),
+    )
 
     # more feature ideas:
     # - max_usages_per_order
@@ -187,6 +212,14 @@ class Discount(LoggedModel):
                   'on a minimum value.')
             )
 
+        if data.get('subevent_mode') == cls.SUBEVENT_MODE_DISTINCT and not data.get('benefit_same_products'):
+            raise ValidationError(
+                {'benefit_same_products': [
+                    _('You cannot apply the discount to a different set of products if the discount is only valid '
+                      'for bookings of different dates.')
+                ]}
+            )
+
     def allow_delete(self):
         return not self.orderposition_set.exists()
 
@@ -197,6 +230,7 @@ class Discount(LoggedModel):
             'condition_min_value': self.condition_min_value,
             'benefit_only_apply_to_cheapest_n_matches': self.benefit_only_apply_to_cheapest_n_matches,
             'subevent_mode': self.subevent_mode,
+            'benefit_same_products': self.benefit_same_products,
         })
 
     def is_available_by_time(self, now_dt=None) -> bool:
@@ -207,14 +241,14 @@ class Discount(LoggedModel):
             return False
         return True
 
-    def _apply_min_value(self, positions, idx_group, result):
-        if self.condition_min_value and sum(positions[idx][2] for idx in idx_group) < self.condition_min_value:
+    def _apply_min_value(self, positions, condition_idx_group, benefit_idx_group, result):
+        if self.condition_min_value and sum(positions[idx][2] for idx in condition_idx_group) < self.condition_min_value:
             return
 
         if self.condition_min_count or self.benefit_only_apply_to_cheapest_n_matches:
             raise ValueError('Validation invariant violated.')
 
-        for idx in idx_group:
+        for idx in benefit_idx_group:
             previous_price = positions[idx][2]
             new_price = round_decimal(
                 previous_price * (Decimal('100.00') - self.benefit_discount_matching_percent) / Decimal('100.00'),
@@ -222,8 +256,8 @@ class Discount(LoggedModel):
             )
             result[idx] = new_price
 
-    def _apply_min_count(self, positions, idx_group, result):
-        if len(idx_group) < self.condition_min_count:
+    def _apply_min_count(self, positions, condition_idx_group, benefit_idx_group, result):
+        if len(condition_idx_group) < self.condition_min_count:
             return
 
         if not self.condition_min_count or self.condition_min_value:
@@ -233,15 +267,17 @@ class Discount(LoggedModel):
             if not self.condition_min_count:
                 raise ValueError('Validation invariant violated.')
 
-            idx_group = sorted(idx_group, key=lambda idx: (positions[idx][2], -idx))  # sort by line_price
+            condition_idx_group = sorted(condition_idx_group, key=lambda idx: (positions[idx][2], -idx))  # sort by line_price
+            benefit_idx_group = sorted(benefit_idx_group, key=lambda idx: (positions[idx][2], -idx))  # sort by line_price
 
             # Prevent over-consuming of items, i.e. if our discount is "buy 2, get 1 free", we only
             # want to match multiples of 3
-            consume_idx = idx_group[:len(idx_group) // self.condition_min_count * self.condition_min_count]
-            benefit_idx = idx_group[:len(idx_group) // self.condition_min_count * self.benefit_only_apply_to_cheapest_n_matches]
+            n_groups = min(len(condition_idx_group) // self.condition_min_count, len(benefit_idx_group))
+            consume_idx = condition_idx_group[:n_groups * self.condition_min_count]
+            benefit_idx = benefit_idx_group[:n_groups * self.benefit_only_apply_to_cheapest_n_matches]
         else:
-            consume_idx = idx_group
-            benefit_idx = idx_group
+            consume_idx = condition_idx_group
+            benefit_idx = benefit_idx_group
 
         for idx in benefit_idx:
             previous_price = positions[idx][2]
@@ -276,7 +312,7 @@ class Discount(LoggedModel):
             limit_products = {p.pk for p in self.condition_limit_products.all()}
 
         # First, filter out everything not even covered by our product scope
-        initial_candidates = [
+        condition_candidates = [
             idx
             for idx, (item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount) in positions.items()
             if (
@@ -286,11 +322,25 @@ class Discount(LoggedModel):
             )
         ]
 
+        if self.benefit_same_products:
+            benefit_candidates = list(condition_candidates)
+        else:
+            benefit_products = {p.pk for p in self.benefit_limit_products.all()}
+            benefit_candidates = [
+                idx
+                for idx, (item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount) in positions.items()
+                if (
+                    item_id in benefit_products and
+                    (self.benefit_apply_to_addons or not is_addon_to) and
+                    (not self.benefit_ignore_voucher_discounted or voucher_discount is None or voucher_discount == Decimal('0.00'))
+                )
+            ]
+
         if self.subevent_mode == self.SUBEVENT_MODE_MIXED:  # also applies to non-series events
             if self.condition_min_count:
-                self._apply_min_count(positions, initial_candidates, result)
+                self._apply_min_count(positions, condition_candidates, benefit_candidates, result)
             else:
-                self._apply_min_value(positions, initial_candidates, result)
+                self._apply_min_value(positions, condition_candidates, benefit_candidates, result)
 
         elif self.subevent_mode == self.SUBEVENT_MODE_SAME:
             def key(idx):
@@ -299,17 +349,18 @@ class Discount(LoggedModel):
             # Build groups of candidates with the same subevent, then apply our regular algorithm
             # to each group
 
-            _groups = groupby(sorted(initial_candidates, key=key), key=key)
-            candidate_groups = [list(g) for k, g in _groups]
+            _groups = groupby(sorted(condition_candidates, key=key), key=key)
+            candidate_groups = [(k, list(g)) for k, g in _groups]
 
-            for g in candidate_groups:
+            for subevent_id, g in candidate_groups:
+                benefit_g = [idx for idx in benefit_candidates if positions[idx][1] == subevent_id]
                 if self.condition_min_count:
-                    self._apply_min_count(positions, g, result)
+                    self._apply_min_count(positions, g, benefit_g, result)
                 else:
-                    self._apply_min_value(positions, g, result)
+                    self._apply_min_value(positions, g, benefit_g, result)
 
         elif self.subevent_mode == self.SUBEVENT_MODE_DISTINCT:
-            if self.condition_min_value:
+            if self.condition_min_value or not self.benefit_same_products:
                 raise ValueError('Validation invariant violated.')
 
             # Build optimal groups of candidates with distinct subevents, then apply our regular algorithm
@@ -336,7 +387,7 @@ class Discount(LoggedModel):
                 candidates = []
                 cardinality = None
                 for se, l in subevent_to_idx.items():
-                    l = [ll for ll in l if ll in initial_candidates and ll not in current_group]
+                    l = [ll for ll in l if ll in condition_candidates and ll not in current_group]
                     if cardinality and len(l) != cardinality:
                         continue
                     if se not in {positions[idx][1] for idx in current_group}:
@@ -373,5 +424,5 @@ class Discount(LoggedModel):
                                 break
 
             for g in candidate_groups:
-                self._apply_min_count(positions, g, result)
+                self._apply_min_count(positions, g, g, result)
         return result

src/pretix/base/models/event.py

@@ -743,12 +743,7 @@ class Event(EventMixin, LoggedModel):
         return ObjectRelatedCache(self)
 
     def lock(self):
-        """
-        Returns a contextmanager that can be used to lock an event for bookings.
-        """
-        from pretix.base.services import locking
-
-        return locking.LockManager(self)
+        raise NotImplementedError("this method has been removed")
 
     def get_mail_backend(self, timeout=None):
         """
@@ -907,14 +902,18 @@ class Event(EventMixin, LoggedModel):
             self.items.filter(hidden_if_available_id=oldid).update(hidden_if_available=q)
 
         for d in Discount.objects.filter(event=other).prefetch_related('condition_limit_products'):
-            items = list(d.condition_limit_products.all())
+            c_items = list(d.condition_limit_products.all())
+            b_items = list(d.benefit_limit_products.all())
             d.pk = None
             d.event = self
             d.save(force_insert=True)
             d.log_action('pretix.object.cloned')
-            for i in items:
+            for i in c_items:
                 if i.pk in item_map:
                     d.condition_limit_products.add(item_map[i.pk])
+            for i in b_items:
+                if i.pk in item_map:
+                    d.benefit_limit_products.add(item_map[i.pk])
 
         question_map = {}
         for q in Question.objects.filter(event=other).prefetch_related('items', 'options'):

src/pretix/base/models/giftcards.py

@@ -116,6 +116,8 @@ class GiftCard(LoggedModel):
 
     @property
     def value(self):
+        if hasattr(self, 'cached_value'):
+            return self.cached_value or Decimal('0.00')
         return self.transactions.aggregate(s=Sum('value'))['s'] or Decimal('0.00')
 
     def accepted_by(self, organizer):

src/pretix/base/models/items.py

@@ -43,6 +43,7 @@ from typing import Optional, Tuple
 from zoneinfo import ZoneInfo
 
 import dateutil.parser
+import django_redis
 from dateutil.tz import datetime_exists
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -57,7 +58,6 @@ from django.utils.functional import cached_property
 from django.utils.timezone import is_naive, make_aware, now
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_countries.fields import Country
-from django_redis import get_redis_connection
 from django_scopes import ScopedManager
 from i18nfield.fields import I18nCharField, I18nTextField
 
@@ -1463,7 +1463,7 @@ class Question(LoggedModel):
         (TYPE_PHONENUMBER, _("Phone number")),
     )
     UNLOCALIZED_TYPES = [TYPE_DATE, TYPE_TIME, TYPE_DATETIME]
-    ASK_DURING_CHECKIN_UNSUPPORTED = [TYPE_PHONENUMBER]
+    ASK_DURING_CHECKIN_UNSUPPORTED = []
 
     event = models.ForeignKey(
         Event,
@@ -1910,8 +1910,13 @@ class Quota(LoggedModel):
 
     def rebuild_cache(self, now_dt=None):
         if settings.HAS_REDIS:
-            rc = get_redis_connection("redis")
-            rc.hdel(f'quotas:{self.event_id}:availabilitycache', str(self.pk))
+            rc = django_redis.get_redis_connection("redis")
+            p = rc.pipeline()
+            p.hdel(f'quotas:{self.event_id}:availabilitycache', str(self.pk))
+            p.hdel(f'quotas:{self.event_id}:availabilitycache:nocw', str(self.pk))
+            p.hdel(f'quotas:{self.event_id}:availabilitycache:igcl', str(self.pk))
+            p.hdel(f'quotas:{self.event_id}:availabilitycache:nocw:igcl', str(self.pk))
+            p.execute()
             self.availability(now_dt=now_dt)
 
     def availability(

src/pretix/base/models/log.py

@@ -88,9 +88,7 @@ class LogEntry(models.Model):
 
     class Meta:
         ordering = ('-datetime', '-id')
-        index_together = [
-            ['datetime', 'id']
-        ]
+        indexes = [models.Index(fields=["datetime", "id"])]
 
     def display(self):
         from ..signals import logentry_display

src/pretix/base/models/media.py

@@ -121,5 +121,30 @@ class ReusableMedium(LoggedModel):
 
     class Meta:
         unique_together = (("identifier", "type", "organizer"),)
-        index_together = (("identifier", "type", "organizer"), ("updated", "id"))
+        indexes = [
+            models.Index(fields=("identifier", "type", "organizer")),
+            models.Index(fields=("updated", "id")),
+        ]
         ordering = "identifier", "type", "organizer"
+
+
+class MediumKeySet(models.Model):
+    organizer = models.ForeignKey('Organizer', on_delete=models.CASCADE, related_name='medium_key_sets')
+    public_id = models.BigIntegerField(
+        unique=True,
+    )
+    media_type = models.CharField(max_length=100)
+    active = models.BooleanField(default=True)
+    uid_key = models.BinaryField()
+    diversification_key = models.BinaryField()
+
+    objects = ScopedManager(organizer='organizer')
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                fields=["organizer", "media_type"],
+                condition=Q(active=True),
+                name="keyset_unique_active",
+            ),
+        ]

src/pretix/base/models/orders.py

@@ -37,10 +37,13 @@ import copy
 import hashlib
 import json
 import logging
+import operator
 import string
 from collections import Counter
 from datetime import datetime, time, timedelta
 from decimal import Decimal
+from functools import reduce
+from time import sleep
 from typing import Any, Dict, List, Union
 from zoneinfo import ZoneInfo
 
@@ -75,7 +78,6 @@ from pretix.base.email import get_email_context
 from pretix.base.i18n import language
 from pretix.base.models import Customer, User
 from pretix.base.reldate import RelativeDateWrapper
-from pretix.base.services.locking import LOCK_TIMEOUT, NoLockManager
 from pretix.base.settings import PERSON_NAME_SCHEMES
 from pretix.base.signals import order_gracefully_delete
 
@@ -83,6 +85,7 @@ from ...helpers import OF_SELF
 from ...helpers.countries import CachedCountries, FastCountryField
 from ...helpers.format import format_map
 from ...helpers.names import build_name
+from ...testutils.middleware import debugflags_var
 from ._transactions import (
     _fail, _transactions_mark_order_clean, _transactions_mark_order_dirty,
 )
@@ -270,9 +273,9 @@ class Order(LockModel, LoggedModel):
         verbose_name = _("Order")
         verbose_name_plural = _("Orders")
         ordering = ("-datetime", "-pk")
-        index_together = [
-            ["datetime", "id"],
-            ["last_modified", "id"],
+        indexes = [
+            models.Index(fields=["datetime", "id"]),
+            models.Index(fields=["last_modified", "id"]),
         ]
 
     def __str__(self):
@@ -630,7 +633,7 @@ class Order(LockModel, LoggedModel):
         positions = list(
             self.positions.all().annotate(
                 has_variations=Exists(ItemVariation.objects.filter(item_id=OuterRef('item_id'))),
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('issued_gift_cards')
         )
         if self.event.settings.change_allow_user_if_checked_in:
@@ -662,7 +665,7 @@ class Order(LockModel, LoggedModel):
             return False
         positions = list(
             self.positions.all().annotate(
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('issued_gift_cards')
         )
         cancelable = all([op.item.allow_cancel and not op.has_checkin and not op.blocked for op in positions])
@@ -817,7 +820,7 @@ class Order(LockModel, LoggedModel):
 
         positions = list(
             self.positions.all().annotate(
-                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk'), list__consider_tickets_used=True))
             ).select_related('item').prefetch_related('item__questions')
         )
         if not self.event.settings.allow_modifications_after_checkin:
@@ -825,7 +828,7 @@ class Order(LockModel, LoggedModel):
                 if cp.has_checkin:
                     return False
 
-        if self.event.settings.get('invoice_address_asked', as_type=bool):
+        if self.event.settings.get('invoice_address_asked', as_type=bool) or self.event.settings.get('invoice_name_required', as_type=bool):
             return True
         ask_names = self.event.settings.get('attendee_names_asked', as_type=bool)
         for cp in positions:
@@ -907,6 +910,11 @@ class Order(LockModel, LoggedModel):
             return self.expires
 
         expires = self.expires.date() + timedelta(days=delay)
+        if self.event.settings.get('payment_term_weekdays'):
+            if expires.weekday() == 5:
+                expires += timedelta(days=2)
+            elif expires.weekday() == 6:
+                expires += timedelta(days=1)
 
         tz = ZoneInfo(self.event.settings.timezone)
         expires = make_aware(datetime.combine(
@@ -918,7 +926,7 @@ class Order(LockModel, LoggedModel):
         else:
             return expires
 
-    def _can_be_paid(self, count_waitinglist=True, ignore_date=False, force=False) -> Union[bool, str]:
+    def _can_be_paid(self, count_waitinglist=True, ignore_date=False, force=False, lock=False) -> Union[bool, str]:
         error_messages = {
             'late_lastdate': _("The payment can not be accepted as the last date of payments configured in the "
                                "payment settings is over."),
@@ -939,10 +947,11 @@ class Order(LockModel, LoggedModel):
         if not self.event.settings.get('payment_term_accept_late') and not ignore_date and not force:
             return error_messages['late']
 
-        return self._is_still_available(count_waitinglist=count_waitinglist, force=force)
+        return self._is_still_available(count_waitinglist=count_waitinglist, force=force, lock=lock)
 
-    def _is_still_available(self, now_dt: datetime=None, count_waitinglist=True, force=False,
+    def _is_still_available(self, now_dt: datetime=None, count_waitinglist=True, lock=False, force=False,
                             check_voucher_usage=False, check_memberships=False) -> Union[bool, str]:
+        from pretix.base.services.locking import lock_objects
         from pretix.base.services.memberships import (
             validate_memberships_in_order,
         )
@@ -961,10 +970,21 @@ class Order(LockModel, LoggedModel):
         try:
             if check_memberships:
                 try:
-                    validate_memberships_in_order(self.customer, positions, self.event, lock=False, testmode=self.testmode)
+                    validate_memberships_in_order(self.customer, positions, self.event, lock=lock, testmode=self.testmode)
                 except ValidationError as e:
                     raise Quota.QuotaExceededException(e.message)
 
+            for cp in positions:
+                cp._cached_quotas = list(cp.quotas) if not force else []
+
+            if lock:
+                lock_objects(
+                    [q for q in reduce(operator.or_, (set(cp._cached_quotas) for cp in positions), set()) if q.size is not None] +
+                    [op.voucher for op in positions if op.voucher and not force] +
+                    [op.seat for op in positions if op.seat],
+                    shared_lock_objects=[self.event]
+                )
+
             for i, op in enumerate(positions):
                 if op.seat:
                     if not op.seat.is_available(ignore_orderpos=op):
@@ -989,7 +1009,7 @@ class Order(LockModel, LoggedModel):
                             voucher=op.voucher.code
                         ))
 
-                quotas = list(op.quotas)
+                quotas = op._cached_quotas
                 if len(quotas) == 0:
                     raise Quota.QuotaExceededException(error_messages['unavailable'].format(
                         item=str(op.item) + (' - ' + str(op.variation) if op.variation else '')
@@ -1011,6 +1031,9 @@ class Order(LockModel, LoggedModel):
                             ))
         except Quota.QuotaExceededException as e:
             return str(e)
+
+        if 'sleep-after-quota-check' in debugflags_var.get():
+            sleep(2)
         return True
 
     def send_mail(self, subject: Union[str, LazyI18nString], template: Union[str, LazyI18nString],
@@ -1241,7 +1264,7 @@ class QuestionAnswer(models.Model):
 
     @property
     def is_image(self):
-        return any(self.file.name.lower().endswith(e) for e in ('.jpg', '.png', '.gif', '.tiff', '.bmp', '.jpeg'))
+        return any(self.file.name.lower().endswith(e) for e in settings.FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE)
 
     @property
     def file_name(self):
@@ -1642,9 +1665,10 @@ class OrderPayment(models.Model):
         return self.order.event.get_payment_providers(cached=True).get(self.provider)
 
     @transaction.atomic()
-    def _mark_paid_inner(self, force, count_waitinglist, user, auth, ignore_date=False, overpaid=False):
+    def _mark_paid_inner(self, force, count_waitinglist, user, auth, ignore_date=False, overpaid=False, lock=False):
         from pretix.base.signals import order_paid
-        can_be_paid = self.order._can_be_paid(count_waitinglist=count_waitinglist, ignore_date=ignore_date, force=force)
+        can_be_paid = self.order._can_be_paid(count_waitinglist=count_waitinglist, ignore_date=ignore_date, force=force,
+                                              lock=lock)
         if can_be_paid is not True:
             self.order.log_action('pretix.event.order.quotaexceeded', {
                 'message': can_be_paid
@@ -1667,12 +1691,13 @@ class OrderPayment(models.Model):
         if status_change:
             self.order.create_transactions()
 
-    def fail(self, info=None, user=None, auth=None, log_data=None):
+    def fail(self, info=None, user=None, auth=None, log_data=None, send_mail=True):
         """
         Marks the order as failed and sets info to ``info``, but only if the order is in ``created`` or ``pending``
         state. This is equivalent to setting ``state`` to ``OrderPayment.PAYMENT_STATE_FAILED`` and logging a failure,
-        but it adds strong database logging since we do not want to report a failure for an order that has just
+        but it adds strong database locking since we do not want to report a failure for an order that has just
         been marked as paid.
+        :param send_mail: Whether an email should be sent to the user about this event (default: ``True``).
         """
         with transaction.atomic():
             locked_instance = OrderPayment.objects.select_for_update(of=OF_SELF).get(pk=self.pk)
@@ -1697,6 +1722,17 @@ class OrderPayment(models.Model):
             'info': info,
             'data': log_data,
         }, user=user, auth=auth)
+
+        if send_mail:
+            with language(self.order.locale, self.order.event.settings.region):
+                email_subject = self.order.event.settings.mail_subject_order_payment_failed
+                email_template = self.order.event.settings.mail_text_order_payment_failed
+                email_context = get_email_context(event=self.order.event, order=self.order)
+                self.order.send_mail(
+                    email_subject, email_template, email_context,
+                    'pretix.event.order.email.payment_failed', user=user, auth=auth,
+                )
+
         return True
 
     def confirm(self, count_waitinglist=True, send_mail=True, force=False, user=None, auth=None, mail_text='',
@@ -1763,25 +1799,24 @@ class OrderPayment(models.Model):
             ))
             return
 
-        self._mark_order_paid(count_waitinglist, send_mail, force, user, auth, mail_text, ignore_date, lock, payment_sum - refund_sum,
-                              generate_invoice)
+        with transaction.atomic():
+            self._mark_order_paid(count_waitinglist, send_mail, force, user, auth, mail_text, ignore_date, lock, payment_sum - refund_sum,
+                                  generate_invoice)
 
     def _mark_order_paid(self, count_waitinglist=True, send_mail=True, force=False, user=None, auth=None, mail_text='',
                          ignore_date=False, lock=True, payment_refund_sum=0, allow_generate_invoice=True):
         from pretix.base.services.invoices import (
             generate_invoice, invoice_qualified,
         )
+        from pretix.base.services.locking import LOCK_TRUST_WINDOW
 
-        if (self.order.status == Order.STATUS_PENDING and self.order.expires > now() + timedelta(seconds=LOCK_TIMEOUT * 2)) or not lock:
+        if lock and self.order.status == Order.STATUS_PENDING and self.order.expires > now() + timedelta(seconds=LOCK_TRUST_WINDOW):
             # Performance optimization. In this case, there's really no reason to lock everything and an atomic
             # database transaction is more than enough.
-            lockfn = NoLockManager
-        else:
-            lockfn = self.order.event.lock
+            lock = False
 
-        with lockfn():
-            self._mark_paid_inner(force, count_waitinglist, user, auth, overpaid=payment_refund_sum > self.order.total,
-                                  ignore_date=ignore_date)
+        self._mark_paid_inner(force, count_waitinglist, user, auth, overpaid=payment_refund_sum > self.order.total,
+                              ignore_date=ignore_date, lock=lock)
 
         invoice = None
         if invoice_qualified(self.order) and allow_generate_invoice:
@@ -2594,7 +2629,7 @@ class OrderPosition(AbstractPosition):
         with language(self.order.locale, self.order.event.settings.region):
             email_template = self.event.settings.mail_text_resend_link
             email_context = get_email_context(event=self.order.event, order=self.order, position=self)
-            email_subject = self.event.settings.mail_subject_resend_link
+            email_subject = self.event.settings.mail_subject_resend_link_attendee
             self.send_mail(
                 email_subject, email_template, email_context,
                 'pretix.event.order.email.resend', user=user, auth=auth,
@@ -2739,8 +2774,8 @@ class Transaction(models.Model):
 
     class Meta:
         ordering = 'datetime', 'pk'
-        index_together = [
-            ['datetime', 'id']
+        indexes = [
+            models.Index(fields=['datetime', 'id'])
         ]
 
     def save(self, *args, **kwargs):

src/pretix/base/models/tax.py

@@ -340,10 +340,17 @@ class TaxRule(LoggedModel):
         rules = self._custom_rules
         if invoice_address:
             for r in rules:
-                if r['country'] == 'EU' and not is_eu_country(invoice_address.country):
-                    continue
-                if r['country'] not in ('ZZ', 'EU') and r['country'] != str(invoice_address.country):
-                    continue
+                if r['country'] == 'ZZ':    # Rule: Any country
+                    pass
+                elif r['country'] == 'EU':  # Rule: Any EU country
+                    if not is_eu_country(invoice_address.country):
+                        continue
+                elif '-' in r['country']:   # Rule: Specific country and state
+                    if r['country'] != str(invoice_address.country) + '-' + str(invoice_address.state):
+                        continue
+                else:                       # Rule: Specific country
+                    if r['country'] != str(invoice_address.country):
+                        continue
                 if r['address_type'] == 'individual' and invoice_address.is_business:
                     continue
                 if r['address_type'] in ('business', 'business_vat_id') and not invoice_address.is_business:

src/pretix/base/models/vouchers.py

@@ -435,28 +435,37 @@ class Voucher(LoggedModel):
 
     @staticmethod
     def clean_quota_check(data, cnt, old_instance, event, quota, item, variation):
+        from ..services.locking import lock_objects
+        from ..services.quotas import QuotaAvailability
+
         old_quotas = Voucher.clean_quota_get_ignored(old_instance)
 
         if event.has_subevents and data.get('block_quota') and not data.get('subevent'):
             raise ValidationError(_('If you want this voucher to block quota, you need to select a specific date.'))
 
         if quota:
-            if quota in old_quotas:
-                return
-            else:
-                avail = quota.availability(count_waitinglist=False)
+            new_quotas = {quota}
         elif item and item.has_variations and not variation:
             raise ValidationError(_('You can only block quota if you specify a specific product variation. '
                                     'Otherwise it might be unclear which quotas to block.'))
         elif item and variation:
-            avail = variation.check_quotas(ignored_quotas=old_quotas, subevent=data.get('subevent'))
+            new_quotas = set(variation.quotas.filter(subevent=data.get('subevent')))
         elif item and not item.has_variations:
-            avail = item.check_quotas(ignored_quotas=old_quotas, subevent=data.get('subevent'))
+            new_quotas = set(item.quotas.filter(subevent=data.get('subevent')))
         else:
             raise ValidationError(_('You need to select a specific product or quota if this voucher should reserve '
                                     'tickets.'))
 
-        if avail[0] != Quota.AVAILABILITY_OK or (avail[1] is not None and avail[1] < cnt):
+        if not (new_quotas - old_quotas):
+            return
+
+        lock_objects([q for q in (new_quotas - old_quotas) if q.size is not None], shared_lock_objects=[event])
+
+        qa = QuotaAvailability(count_waitinglist=False)
+        qa.queue(*(new_quotas - old_quotas))
+        qa.compute()
+
+        if any(r[0] != Quota.AVAILABILITY_OK or (r[1] is not None and r[1] < cnt) for r in qa.results.values()):
             raise ValidationError(_('You cannot create a voucher that blocks quota as the selected product or '
                                     'quota is currently sold out or completely reserved.'))
 

src/pretix/base/orderimport.py

@@ -805,7 +805,7 @@ class QuestionColumn(ImportColumn):
                 return self.q.clean_answer(value)
 
     def assign(self, value, order, position, invoice_address, **kwargs):
-        if value:
+        if value is not None:
             if not hasattr(order, '_answers'):
                 order._answers = []
             if isinstance(value, QuestionOption):

src/pretix/base/payment.py

@@ -336,6 +336,12 @@ class BasePaymentProvider:
                  help_text=_('Users will not be able to choose this payment provider after the given date.'),
                  required=False,
              )),
+            ('_availability_start',
+             RelativeDateField(
+                 label=_('Available from'),
+                 help_text=_('Users will not be able to choose this payment provider before the given date.'),
+                 required=False,
+             )),
             ('_total_min',
              forms.DecimalField(
                  label=_('Minimum order total'),
@@ -441,6 +447,13 @@ class BasePaymentProvider:
                      'Share this link with customers who should use this payment method.'
                  ),
              )),
+            ('_prevent_reminder_mail',
+             forms.BooleanField(
+                 label=_('Do not send a payment reminder mail'),
+                 help_text=_('Users will not receive a reminder mail to pay for their order before it expires if '
+                             'they have chosen this payment method.'),
+                 required=False,
+             )),
         ])
         d['_restricted_countries']._as_type = list
         d['_restrict_to_sales_channels']._as_type = list
@@ -497,6 +510,14 @@ class BasePaymentProvider:
         if order.status == Order.STATUS_PAID:
             return _('paid')
 
+    def prevent_reminder_mail(self, order: Order, payment: OrderPayment) -> bool:
+        """
+        This is called when a periodic task runs and sends out reminder mails to orders that have not been paid yet
+        and are soon expiring.
+        The default implementation returns the content of the _prevent_reminder_mail configuration variable (a boolean value).
+        """
+        return self.settings.get('_prevent_reminder_mail', as_type=bool, default=False)
+
     @property
     def payment_form_fields(self) -> dict:
         """
@@ -539,40 +560,65 @@ class BasePaymentProvider:
 
         return form
 
-    def _is_still_available(self, now_dt=None, cart_id=None, order=None):
+    def _absolute_availability_date(self, rel_date, cart_id=None, order=None, aggregate_fn=min):
+        if not rel_date:
+            return None
+        if self.event.has_subevents and cart_id:
+            dates = [
+                rel_date.datetime(se).date()
+                for se in self.event.subevents.filter(
+                    id__in=CartPosition.objects.filter(
+                        cart_id=cart_id, event=self.event
+                    ).values_list('subevent', flat=True)
+                )
+            ]
+            return aggregate_fn(dates) if dates else None
+        elif self.event.has_subevents and order:
+            dates = [
+                rel_date.datetime(se).date()
+                for se in self.event.subevents.filter(
+                    id__in=order.positions.values_list('subevent', flat=True)
+                )
+            ]
+            return aggregate_fn(dates) if dates else None
+        elif self.event.has_subevents:
+            raise NotImplementedError('Payment provider is not subevent-ready.')
+        else:
+            return rel_date.datetime(self.event).date()
+
+    def _is_available_by_time(self, now_dt=None, cart_id=None, order=None):
         now_dt = now_dt or now()
         tz = ZoneInfo(self.event.settings.timezone)
 
-        availability_date = self.settings.get('_availability_date', as_type=RelativeDateWrapper)
-        if availability_date:
-            if self.event.has_subevents and cart_id:
-                dates = [
-                    availability_date.datetime(se).date()
-                    for se in self.event.subevents.filter(
-                        id__in=CartPosition.objects.filter(
-                            cart_id=cart_id, event=self.event
-                        ).values_list('subevent', flat=True)
-                    )
-                ]
-                availability_date = min(dates) if dates else None
-            elif self.event.has_subevents and order:
-                dates = [
-                    availability_date.datetime(se).date()
-                    for se in self.event.subevents.filter(
-                        id__in=order.positions.values_list('subevent', flat=True)
-                    )
-                ]
-                availability_date = min(dates) if dates else None
-            elif self.event.has_subevents:
-                logger.error('Payment provider is not subevent-ready.')
-                return False
-            else:
-                availability_date = availability_date.datetime(self.event).date()
+        try:
+            availability_start = self._absolute_availability_date(
+                self.settings.get('_availability_start', as_type=RelativeDateWrapper),
+                cart_id,
+                order,
+                # In an event series, we use min() for the start as well. This might be inconsistent with using min() for
+                # for the end, but makes it harder to put one self into a situation where no payment provider is available.
+                aggregate_fn=min
+            )
 
-            if availability_date:
-                return availability_date >= now_dt.astimezone(tz).date()
+            if availability_start:
+                if availability_start > now_dt.astimezone(tz).date():
+                    return False
 
-        return True
+            availability_end = self._absolute_availability_date(
+                self.settings.get('_availability_date', as_type=RelativeDateWrapper),
+                cart_id,
+                order,
+                aggregate_fn=min
+            )
+
+            if availability_end:
+                if availability_end < now_dt.astimezone(tz).date():
+                    return False
+
+            return True
+        except NotImplementedError:
+            logger.exception('Unable to check availability')
+            return False
 
     def is_allowed(self, request: HttpRequest, total: Decimal=None) -> bool:
         """
@@ -581,9 +627,9 @@ class BasePaymentProvider:
         user will not be able to select this payment method. This will only be called
         during checkout, not on retrying.
 
-        The default implementation checks for the _availability_date setting to be either unset or in the future
-        and for the _total_max and _total_min requirements to be met. It also checks the ``_restrict_countries``
-        and ``_restrict_to_sales_channels`` setting.
+        The default implementation checks for the ``_availability_date`` setting to be either unset or in the future
+        and for the ``_availability_from``, ``_total_max``, and ``_total_min`` requirements to be met. It also checks
+        the ``_restrict_countries`` and ``_restrict_to_sales_channels`` setting.
 
         :param total: The total value without the payment method fee, after taxes.
 
@@ -592,7 +638,7 @@ class BasePaymentProvider:
            The ``total`` parameter has been added. For backwards compatibility, this method is called again
            without this parameter if it raises a ``TypeError`` on first try.
         """
-        timing = self._is_still_available(cart_id=get_or_create_cart_id(request))
+        timing = self._is_available_by_time(cart_id=get_or_create_cart_id(request))
         pricing = True
 
         if (self.settings._total_max is not None or self.settings._total_min is not None) and total is None:
@@ -742,7 +788,7 @@ class BasePaymentProvider:
         the amount of money that should be paid.
 
         If you need any special behavior, you can return a string containing the URL the user will be redirected to.
-        If you are done with your process you should return the user to the order's detail page. Redirection is not
+        If you are done with your process you should return the user to the order's detail page. Redirection is only
         allowed if you set ``execute_payment_needs_user`` to ``True``.
 
         If the payment is completed, you should call ``payment.confirm()``. Please note that this might
@@ -776,8 +822,8 @@ class BasePaymentProvider:
         Will be called to check whether it is allowed to change the payment method of
         an order to this one.
 
-        The default implementation checks for the _availability_date setting to be either unset or in the future,
-        as well as for the _total_max, _total_min and _restricted_countries settings.
+        The default implementation checks for the ``_availability_date`` setting to be either unset or in the future,
+        as well as for the ``_availability_from``, ``_total_max``, ``_total_min``, and ``_restricted_countries`` settings.
 
         :param order: The order object
         """
@@ -804,7 +850,7 @@ class BasePaymentProvider:
         if order.sales_channel not in self.settings.get('_restrict_to_sales_channels', as_type=list, default=['web']):
             return False
 
-        return self._is_still_available(order=order)
+        return self._is_available_by_time(order=order)
 
     def payment_prepare(self, request: HttpRequest, payment: OrderPayment) -> Union[bool, str]:
         """

src/pretix/base/pdf.py

@@ -43,7 +43,7 @@ import subprocess
 import tempfile
 import unicodedata
 import uuid
-from collections import OrderedDict
+from collections import OrderedDict, defaultdict
 from functools import partial
 from io import BytesIO
 
@@ -54,6 +54,7 @@ from django.conf import settings
 from django.contrib.staticfiles import finders
 from django.core.exceptions import ValidationError
 from django.db.models import Max, Min
+from django.db.models.fields.files import FieldFile
 from django.dispatch import receiver
 from django.utils.deconstruct import deconstructible
 from django.utils.formats import date_format
@@ -107,7 +108,10 @@ DEFAULT_VARIABLES = OrderedDict((
     ("positionid", {
         "label": _("Order position number"),
         "editor_sample": "1",
-        "evaluate": lambda orderposition, order, event: str(orderposition.positionid)
+        "evaluate": lambda orderposition, order, event: str(orderposition.positionid),
+        # There is no performance gain in using evaluate_bulk here, but we want to make sure it is used somewhere
+        # in core to make sure we notice if the implementation of the API breaks.
+        "evaluate_bulk": lambda orderpositions: [str(p.positionid) for p in orderpositions],
     }),
     ("order_positionid", {
         "label": _("Order code and position number"),
@@ -360,14 +364,9 @@ DEFAULT_VARIABLES = OrderedDict((
     }),
     ("addons", {
         "label": _("List of Add-Ons"),
-        "editor_sample": _("Add-on 1\nAdd-on 2"),
+        "editor_sample": _("Add-on 1\n2x Add-on 2"),
         "evaluate": lambda op, order, ev: "\n".join([
-            '{} - {}'.format(p.item.name, p.variation.value) if p.variation else str(p.item.name)
-            for p in (
-                op.addons.all() if 'addons' in getattr(op, '_prefetched_objects_cache', {})
-                else op.addons.select_related('item', 'variation')
-            )
-            if not p.canceled
+            str(p) for p in generate_compressed_addon_list(op, order, ev)
         ])
     }),
     ("organizer", {
@@ -525,7 +524,7 @@ def images_from_questions(sender, *args, **kwargs):
         else:
             a = op.answers.filter(question_id=question_id).first() or a
 
-        if not a or not a.file or not any(a.file.name.lower().endswith(e) for e in (".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tif", ".tiff")):
+        if not a or not a.file or not any(a.file.name.lower().endswith(e) for e in settings.FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE):
             return None
         else:
             if etag:
@@ -701,6 +700,30 @@ def get_seat(op: OrderPosition):
     return None
 
 
+def generate_compressed_addon_list(op, order, event):
+    itemcount = defaultdict(int)
+    addons = [p for p in (
+        op.addons.all() if 'addons' in getattr(op, '_prefetched_objects_cache', {})
+        else op.addons.select_related('item', 'variation')
+    ) if not p.canceled]
+    for pos in addons:
+        itemcount[pos.item, pos.variation] += 1
+
+    addonlist = []
+    for (item, variation), count in itemcount.items():
+        if variation:
+            if count > 1:
+                addonlist.append('{}x {} - {}'.format(count, item.name, variation.value))
+            else:
+                addonlist.append('{} - {}'.format(item.name, variation.value))
+        else:
+            if count > 1:
+                addonlist.append('{}x {}'.format(count, item.name))
+            else:
+                addonlist.append(item.name)
+    return addonlist
+
+
 class Renderer:
 
     def __init__(self, event, layout, background_file):
@@ -866,7 +889,7 @@ class Renderer:
 
         if image_file:
             try:
-                ir = ThumbnailingImageReader(image_file.path)
+                ir = ThumbnailingImageReader(image_file)
                 ir.resize(float(o['width']) * mm, float(o['height']) * mm, 300)
                 canvas.drawImage(
                     image=ir,
@@ -878,6 +901,11 @@ class Renderer:
                     anchor='c',  # centered in frame
                     mask='auto'
                 )
+                if isinstance(image_file, FieldFile):
+                    # ThumbnailingImageReader "closes" the file, so it's no use to use the same file pointer
+                    # in case we need it again. For FieldFile, fortunately, there is an easy way to make the file
+                    # refresh itself when it is used next.
+                    del image_file.file
             except:
                 logger.exception("Can not load or resize image")
                 canvas.saveState()

src/pretix/base/services/cart.py

@@ -36,6 +36,7 @@ import uuid
 from collections import Counter, defaultdict, namedtuple
 from datetime import datetime, time, timedelta
 from decimal import Decimal
+from time import sleep
 from typing import List, Optional
 
 from celery.exceptions import MaxRetriesExceededError
@@ -62,7 +63,7 @@ from pretix.base.models.orders import OrderFee
 from pretix.base.models.tax import TaxRule
 from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.services.checkin import _save_answers
-from pretix.base.services.locking import LockTimeoutException, NoLockManager
+from pretix.base.services.locking import LockTimeoutException, lock_objects
 from pretix.base.services.pricing import (
     apply_discounts, get_line_price, get_listed_price, get_price,
     is_included_for_free,
@@ -76,6 +77,7 @@ from pretix.celery_app import app
 from pretix.presale.signals import (
     checkout_confirm_messages, fee_calculation_for_cart,
 )
+from pretix.testutils.middleware import debugflags_var
 
 
 class CartError(Exception):
@@ -141,9 +143,10 @@ error_messages = {
     'price_not_a_number': gettext_lazy('The entered price is not a number.'),
     'price_too_high': gettext_lazy('The entered price is to high.'),
     'voucher_invalid': gettext_lazy('This voucher code is not known in our database.'),
-    'voucher_min_usages': gettext_lazy(
-        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s '
-        'matching products.'
+    'voucher_min_usages': ngettext_lazy(
+        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products.',
+        'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products.',
+        'number'
     ),
     'voucher_min_usages_removed': ngettext_lazy(
         'The voucher code "%(voucher)s" can only be used if you select at least %(number)s matching products. '
@@ -1072,23 +1075,43 @@ class CartManager:
                     )
         return err
 
+    @transaction.atomic(durable=True)
     def _perform_operations(self):
+        full_lock_required = any(getattr(o, 'seat', False) for o in self._operations) and self.event.settings.seating_minimal_distance > 0
+        if full_lock_required:
+            # We lock the entire event in this case since we don't want to deal with fine-granular locking
+            # in the case of seating distance enforcement
+            lock_objects([self.event])
+        else:
+            lock_objects(
+                [q for q, d in self._quota_diff.items() if q.size is not None and d > 0] +
+                [v for v, d in self._voucher_use_diff.items() if d > 0] +
+                [getattr(o, 'seat', False) for o in self._operations if getattr(o, 'seat', False)],
+                shared_lock_objects=[self.event]
+            )
         vouchers_ok = self._get_voucher_availability()
         quotas_ok = _get_quota_availability(self._quota_diff, self.now_dt)
         err = None
         new_cart_positions = []
+        deleted_positions = set()
 
         err = err or self._check_min_max_per_product()
 
         self._operations.sort(key=lambda a: self.order[type(a)])
         seats_seen = set()
 
+        if 'sleep-after-quota-check' in debugflags_var.get():
+            sleep(2)
+
         for iop, op in enumerate(self._operations):
             if isinstance(op, self.RemoveOperation):
                 if op.position.expires > self.now_dt:
                     for q in op.position.quotas:
                         quotas_ok[q] += 1
-                op.position.addons.all().delete()
+                addons = op.position.addons.all()
+                deleted_positions |= {a.pk for a in addons}
+                addons.delete()
+                deleted_positions.add(op.position.pk)
                 op.position.delete()
 
             elif isinstance(op, (self.AddOperation, self.ExtendOperation)):
@@ -1238,20 +1261,28 @@ class CartManager:
                     if op.seat and not op.seat.is_available(ignore_cart=op.position, sales_channel=self._sales_channel,
                                                             ignore_voucher_id=op.position.voucher_id):
                         err = err or error_messages['seat_unavailable']
-                        op.position.addons.all().delete()
+
+                        addons = op.position.addons.all()
+                        deleted_positions |= {a.pk for a in addons}
+                        deleted_positions.add(op.position.pk)
+                        addons.delete()
                         op.position.delete()
                     elif available_count == 1:
                         op.position.expires = self._expiry
                         op.position.listed_price = op.listed_price
                         op.position.price_after_voucher = op.price_after_voucher
                         # op.position.price will be updated by recompute_final_prices_and_taxes()
-                        try:
-                            op.position.save(force_update=True, update_fields=['expires', 'listed_price', 'price_after_voucher'])
-                        except DatabaseError:
-                            # Best effort... The position might have been deleted in the meantime!
-                            pass
+                        if op.position.pk not in deleted_positions:
+                            try:
+                                op.position.save(force_update=True, update_fields=['expires', 'listed_price', 'price_after_voucher'])
+                            except DatabaseError:
+                                # Best effort... The position might have been deleted in the meantime!
+                                pass
                     elif available_count == 0:
-                        op.position.addons.all().delete()
+                        addons = op.position.addons.all()
+                        deleted_positions |= {a.pk for a in addons}
+                        deleted_positions.add(op.position.pk)
+                        addons.delete()
                         op.position.delete()
                     else:
                         raise AssertionError("ExtendOperation cannot affect more than one item")
@@ -1276,22 +1307,11 @@ class CartManager:
                     p.save()
                 _save_answers(p, {}, p._answers)
         CartPosition.objects.bulk_create([p for p in new_cart_positions if not getattr(p, '_answers', None) and not p.pk])
+
+        if 'sleep-before-commit' in debugflags_var.get():
+            sleep(2)
         return err
 
-    def _require_locking(self):
-        if self._voucher_use_diff:
-            # If any vouchers are used, we lock to make sure we don't redeem them to often
-            return True
-
-        if self._quota_diff and any(q.size is not None for q in self._quota_diff):
-            # If any quotas are affected that are not unlimited, we lock
-            return True
-
-        if any(getattr(o, 'seat', False) for o in self._operations):
-            return True
-
-        return False
-
     def recompute_final_prices_and_taxes(self):
         positions = sorted(list(self.positions), key=lambda op: -(op.addon_to_id or 0))
         diff = Decimal('0.00')
@@ -1330,18 +1350,14 @@ class CartManager:
         err = self.extend_expired_positions() or err
         err = err or self._check_min_per_voucher()
 
-        lockfn = NoLockManager
-        if self._require_locking():
-            lockfn = self.event.lock
+        self.now_dt = now()
 
-        with lockfn() as now_dt:
-            with transaction.atomic():
-                self.now_dt = now_dt
-                self._extend_expiry_of_valid_existing_positions()
-                err = self._perform_operations() or err
-                self.recompute_final_prices_and_taxes()
-            if err:
-                raise CartError(err)
+        self._extend_expiry_of_valid_existing_positions()
+        err = self._perform_operations() or err
+        self.recompute_final_prices_and_taxes()
+
+        if err:
+            raise CartError(err)
 
 
 def add_payment_to_cart(request, provider, min_value: Decimal=None, max_value: Decimal=None, info_data: dict=None):

src/pretix/base/services/checkin.py

@@ -53,8 +53,8 @@ from django.utils.translation import gettext as _
 from django_scopes import scope, scopes_disabled
 
 from pretix.base.models import (
-    Checkin, CheckinList, Device, Event, ItemVariation, Order, OrderPosition,
-    QuestionOption,
+    Checkin, CheckinList, Device, Event, Gate, Item, ItemVariation, Order,
+    OrderPosition, QuestionOption,
 )
 from pretix.base.signals import checkin_created, order_placed, periodic_task
 from pretix.helpers import OF_SELF
@@ -87,7 +87,7 @@ def _build_time(t=None, value=None, ev=None, now_dt=None):
 
 
 def _logic_annotate_for_graphic_explain(rules, ev, rule_data, now_dt):
-    logic_environment = _get_logic_environment(ev, now_dt)
+    logic_environment = _get_logic_environment(ev, rule_data, now_dt)
     event = ev if isinstance(ev, Event) else ev.event
 
     def _evaluate_inners(r):
@@ -109,9 +109,26 @@ def _logic_annotate_for_graphic_explain(rules, ev, rule_data, now_dt):
             var = values[0] if isinstance(values, list) else values
             val = rule_data[var]
             if var == "product":
-                val = str(event.items.get(pk=val))
+                try:
+                    val = str(event.items.get(pk=val))
+                except Item.DoesNotExist:
+                    val = "?"
             elif var == "variation":
-                val = str(ItemVariation.objects.get(item__event=event, pk=val))
+                if not val:
+                    val = "-"
+                else:
+                    try:
+                        val = str(ItemVariation.objects.get(item__event=event, pk=val))
+                    except ItemVariation.DoesNotExist:
+                        val = "?"
+            elif var == "gate":
+                if not val:
+                    val = "-"
+                else:
+                    try:
+                        val = str(event.organizer.gates.get(pk=val))
+                    except Gate.DoesNotExist:
+                        val = "?"
             elif isinstance(val, datetime):
                 val = date_format(val.astimezone(ev.timezone), "SHORT_DATETIME_FORMAT")
             return {"var": var, "__result": val}
@@ -152,7 +169,7 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
     get in before 17:00". In the middle of the night it would switch to "You can only get in after 09:00".
     """
     now_dt = now_dt or now()
-    logic_environment = _get_logic_environment(ev, now_dt)
+    logic_environment = _get_logic_environment(ev, rule_data, now_dt)
     _var_values = {'False': False, 'True': True}
     _var_explanations = {}
 
@@ -174,15 +191,22 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
         _var_values[new_var_name] = result
         if not result:
             # Operator returned false, let's dig deeper
-            if "var" not in values[0]:
+            if "var" in values[0]:
+                if isinstance(values[0]["var"], list):
+                    values[0]["var"] = values[0]["var"][0]
+                _var_explanations[new_var_name] = {
+                    'operator': operator,
+                    'var': values[0]["var"],
+                    'rhs': values[1:],
+                }
+            elif "entries_since" in values[0] or "entries_before" in values[0]:
+                _var_explanations[new_var_name] = {
+                    'operator': operator,
+                    'var': values[0],
+                    'rhs': values[1:],
+                }
+            else:
                 raise ValueError("Binary operators should be normalized to have a variable on their left-hand side")
-            if isinstance(values[0]["var"], list):
-                values[0]["var"] = values[0]["var"][0]
-            _var_explanations[new_var_name] = {
-                'operator': operator,
-                'var': values[0]["var"],
-                'rhs': values[1:],
-            }
         return {'var': new_var_name}
     try:
         rules = _evaluate_inners(rules)
@@ -249,11 +273,17 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
         elif var == 'product' or var == 'variation':
             var_weights[vname] = (1000, 0)
             var_texts[vname] = _('Ticket type not allowed')
-        elif var in ('entries_number', 'entries_today', 'entries_days', 'minutes_since_last_entry', 'minutes_since_first_entry', 'now_isoweekday'):
+        elif var == 'gate':
+            var_weights[vname] = (500, 0)
+            var_texts[vname] = _('Wrong entrance gate')
+        elif var in ('entries_number', 'entries_today', 'entries_days', 'minutes_since_last_entry', 'minutes_since_first_entry', 'now_isoweekday') \
+                or (isinstance(var, dict) and ("entries_since" in var or "entries_before" in var)):
             w = {
                 'minutes_since_first_entry': 80,
                 'minutes_since_last_entry': 90,
                 'entries_days': 100,
+                'entries_since': 110,
+                'entries_before': 110,
                 'entries_number': 120,
                 'entries_today': 140,
                 'now_isoweekday': 210,
@@ -272,8 +302,24 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
                 'entries_days': _('number of days with an entry'),
                 'entries_number': _('number of entries'),
                 'entries_today': _('number of entries today'),
+                'entries_since': _('number of entries since {datetime}'),
+                'entries_before': _('number of entries before {datetime}'),
                 'now_isoweekday': _('week day'),
             }
+
+            if isinstance(var, dict) and ("entries_since" in var or "entries_before" in var):
+                varname = list(var.keys())[0]
+                cutoff = _build_time(*var[varname][0]['buildTime'], ev=ev, now_dt=now_dt).astimezone(ev.timezone)
+                if abs(now_dt - cutoff) < timedelta(hours=12):
+                    compare_to_text = date_format(cutoff, 'TIME_FORMAT')
+                else:
+                    compare_to_text = date_format(cutoff, 'SHORT_DATETIME_FORMAT')
+                l[varname] = str(l[varname].format(datetime=compare_to_text))
+                var = varname
+                var_result = getattr(rule_data, var)(cutoff)
+            else:
+                var_result = rule_data[var]
+
             compare_to = rhs[0]
             penalty = 0
 
@@ -290,7 +336,7 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
                     # These are "technical" comparisons without real meaning, we don't want to show them.
                     penalty = 1000
 
-            var_weights[vname] = (w[var] + operator_weights.get(operator, 0) + penalty, abs(compare_to - rule_data[var]))
+            var_weights[vname] = (w[var] + operator_weights.get(operator, 0) + penalty, abs(compare_to - var_result))
 
             if var == 'now_isoweekday':
                 compare_to = {
@@ -337,12 +383,14 @@ def _logic_explain(rules, ev, rule_data, now_dt=None):
     return ', '.join(var_texts[v] for v in paths_with_min_weight[0] if not _var_values[v])
 
 
-def _get_logic_environment(ev, now_dt):
+def _get_logic_environment(ev, rule_data, now_dt):
     # Every change to our supported JSON logic must be done
     # * in pretix.base.services.checkin
     # * in pretix.base.models.checkin
+    # * in pretix.helpers.jsonlogic_boolalg
     # * in checkinrules.js
     # * in libpretixsync
+    # * in pretixscan-ios
 
     def is_before(t1, t2, tolerance=None):
         if tolerance:
@@ -357,14 +405,18 @@ def _get_logic_environment(ev, now_dt):
     logic.add_operation('buildTime', partial(_build_time, ev=ev, now_dt=now_dt))
     logic.add_operation('isBefore', is_before)
     logic.add_operation('isAfter', lambda t1, t2, tol=None: is_before(t2, t1, tol))
+    logic.add_operation('entries_since', lambda t1: rule_data.entries_since(t1))
+    logic.add_operation('entries_before', lambda t1: rule_data.entries_before(t1))
     return logic
 
 
 class LazyRuleVars:
-    def __init__(self, position, clist, dt):
+    def __init__(self, position, clist, dt, gate):
         self._position = position
         self._clist = clist
         self._dt = dt
+        self._gate = gate
+        self.__cache = {}
 
     def __getitem__(self, item):
         if item[0] != '_' and hasattr(self, item):
@@ -380,6 +432,10 @@ class LazyRuleVars:
         tz = self._clist.event.timezone
         return self._dt.astimezone(tz).isoweekday()
 
+    @property
+    def gate(self):
+        return self._gate.pk if self._gate else None
+
     @property
     def product(self):
         return self._position.item_id
@@ -398,6 +454,16 @@ class LazyRuleVars:
         midnight = self._dt.astimezone(tz).replace(hour=0, minute=0, second=0, microsecond=0)
         return self._position.checkins.filter(type=Checkin.TYPE_ENTRY, list=self._clist, datetime__gte=midnight).count()
 
+    def entries_since(self, cutoff):
+        if ('entries_since', cutoff) not in self.__cache:
+            self.__cache['entries_since', cutoff] = self._position.checkins.filter(type=Checkin.TYPE_ENTRY, list=self._clist, datetime__gte=cutoff).count()
+        return self.__cache['entries_since', cutoff]
+
+    def entries_before(self, cutoff):
+        if ('entries_before', cutoff) not in self.__cache:
+            self.__cache['entries_before', cutoff] = self._position.checkins.filter(type=Checkin.TYPE_ENTRY, list=self._clist, datetime__lt=cutoff).count()
+        return self.__cache['entries_before', cutoff]
+
     @cached_property
     def entries_days(self):
         tz = self._clist.event.timezone
@@ -446,8 +512,9 @@ class SQLLogic:
     * Comparison operators (==, !=, …) never contain boolean operators (and, or) further down in the stack
     """
 
-    def __init__(self, list):
+    def __init__(self, list, gate=None):
         self.list = list
+        self.gate = gate
         self.bool_ops = {
             "and": lambda *args: reduce(lambda total, arg: total & arg, args) if args else Q(),
             "or": lambda *args: reduce(lambda total, arg: total | arg, args) if args else Q(),
@@ -463,7 +530,7 @@ class SQLLogic:
             "isBefore": partial(self.comparison_to_q, operator=LowerThan, modifier=partial(tolerance, sign=1)),
             "isAfter": partial(self.comparison_to_q, operator=GreaterThan, modifier=partial(tolerance, sign=-1)),
         }
-        self.expression_ops = {'buildTime', 'objectList', 'lookup', 'var'}
+        self.expression_ops = {'buildTime', 'objectList', 'lookup', 'var', 'entries_since', 'entries_before'}
 
     def operation_to_expression(self, rule):
         if not isinstance(rule, dict):
@@ -511,6 +578,36 @@ class SQLLogic:
             return [self.operation_to_expression(v) for v in values]
         elif operator == 'lookup':
             return int(values[1])
+        elif operator == 'entries_since':
+            return Coalesce(
+                Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                        datetime__gte=self.operation_to_expression(values[0]),
+                    ).values('position_id').order_by().annotate(
+                        c=Count('*')
+                    ).values('c')
+                ),
+                Value(0),
+                output_field=IntegerField()
+            )
+        elif operator == 'entries_before':
+            return Coalesce(
+                Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                        datetime__lt=self.operation_to_expression(values[0]),
+                    ).values('position_id').order_by().annotate(
+                        c=Count('*')
+                    ).values('c')
+                ),
+                Value(0),
+                output_field=IntegerField()
+            )
         elif operator == 'var':
             if values[0] == 'now':
                 return Value(now().astimezone(timezone.utc))
@@ -520,6 +617,8 @@ class SQLLogic:
                 return F('item_id')
             elif values[0] == 'variation':
                 return F('variation_id')
+            elif values[0] == 'gate':
+                return Value(self.gate.pk if self.gate else None)
             elif values[0] == 'entries_number':
                 return Coalesce(
                     Subquery(
@@ -731,7 +830,8 @@ def _save_answers(op, answers, given_answers):
 def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict, force=False,
                     ignore_unpaid=False, nonce=None, datetime=None, questions_supported=True,
                     user=None, auth=None, canceled_supported=False, type=Checkin.TYPE_ENTRY,
-                    raw_barcode=None, raw_source_type=None, from_revoked_secret=False, simulate=False):
+                    raw_barcode=None, raw_source_type=None, from_revoked_secret=False, simulate=False,
+                    gate=None):
     """
     Create a checkin for this particular order position and check-in list. Fails with CheckInError if the check in is
     not valid at this time.
@@ -746,6 +846,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
     :param nonce: A random nonce to prevent race conditions.
     :param datetime: The datetime of the checkin, defaults to now.
     :param simulate: If true, the check-in is not saved.
+    :param gate: The gate the check-in was performed at.
     """
 
     # !!!!!!!!!
@@ -860,8 +961,8 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                 )
 
         if type == Checkin.TYPE_ENTRY and clist.rules:
-            rule_data = LazyRuleVars(op, clist, dt)
-            logic = _get_logic_environment(op.subevent or clist.event, now_dt=dt)
+            rule_data = LazyRuleVars(op, clist, dt, gate=gate)
+            logic = _get_logic_environment(op.subevent or clist.event, rule_data, now_dt=dt)
             if not logic.apply(clist.rules, rule_data):
                 if force:
                     force_used = True
@@ -885,8 +986,10 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
         device = None
         if isinstance(auth, Device):
             device = auth
+            if not gate:
+                gate = device.gate
 
-        last_cis = list(op.checkins.order_by('-datetime').filter(list=clist).only('type', 'nonce'))
+        last_cis = list(op.checkins.order_by('-datetime').filter(list=clist).only('type', 'nonce', 'position_id'))
         entry_allowed = (
             type == Checkin.TYPE_EXIT or
             clist.allow_multiple_entries or
@@ -908,7 +1011,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                     list=clist,
                     datetime=dt,
                     device=device,
-                    gate=device.gate if device else None,
+                    gate=gate,
                     nonce=nonce,
                     forced=force and (not entry_allowed or from_revoked_secret or force_used),
                     force_sent=force,

src/pretix/base/services/export.py

@@ -63,7 +63,7 @@ class ExportEmptyError(ExportError):
     pass
 
 
-@app.task(base=ProfiledEventTask, throws=(ExportError,), bind=True)
+@app.task(base=ProfiledEventTask, throws=(ExportError, ExportEmptyError), bind=True)
 def export(self, event: Event, fileid: str, provider: str, form_data: Dict[str, Any]) -> None:
     def set_progress(val):
         if not self.request.called_directly:
@@ -94,7 +94,7 @@ def export(self, event: Event, fileid: str, provider: str, form_data: Dict[str,
     return str(file.pk)
 
 
-@app.task(base=ProfiledOrganizerUserTask, throws=(ExportError,), bind=True)
+@app.task(base=ProfiledOrganizerUserTask, throws=(ExportError, ExportEmptyError), bind=True)
 def multiexport(self, organizer: Organizer, user: User, device: int, token: int, fileid: str, provider: str,
                 form_data: Dict[str, Any], staff_session=False) -> None:
     if device:

src/pretix/base/services/locking.py

@@ -20,31 +20,105 @@
 # <https://www.gnu.org/licenses/>.
 #
 
-# This file is based on an earlier version of pretix which was released under the Apache License 2.0. The full text of
-# the Apache License 2.0 can be obtained at <http://www.apache.org/licenses/LICENSE-2.0>.
-#
-# This file may have since been changed and any changes are released under the terms of AGPLv3 as described above. A
-# full history of changes and contributors is available at <https://github.com/pretix/pretix>.
-#
-# This file contains Apache-licensed contributions copyrighted by: Tobias Kunze
-#
-# Unless required by applicable law or agreed to in writing, software distributed under the Apache License 2.0 is
-# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations under the License.
-
 import logging
-import time
-import uuid
-from datetime import timedelta
+from itertools import groupby
 
 from django.conf import settings
-from django.db import transaction
+from django.db import DatabaseError, connection
 from django.utils.timezone import now
 
-from pretix.base.models import EventLock
+from pretix.base.models import Event, Membership, Quota, Seat, Voucher
+from pretix.testutils.middleware import debugflags_var
 
 logger = logging.getLogger('pretix.base.locking')
-LOCK_TIMEOUT = 120
+
+# A lock acquisition is aborted if it takes longer than LOCK_ACQUISITION_TIMEOUT to prevent connection starvation
+LOCK_ACQUISITION_TIMEOUT = 3
+
+# We make the assumption that it is safe to e.g. transform an order into a cart if the order has a lifetime of more than
+# LOCK_TRUST_WINDOW into the future. In other words, we assume that a lock is never held longer than LOCK_TRUST_WINDOW.
+# This assumption holds true for all in-request locks, since our gunicorn default settings kill a worker that takes
+# longer than 60 seconds to process a request. It however does not hold true for celery tasks, especially long-running
+# ones, so this does introduce *some* risk of incorrect locking.
+LOCK_TRUST_WINDOW = 120
+
+# These are different offsets for the different types of keys we want to lock
+KEY_SPACES = {
+    Event: 1,
+    Quota: 2,
+    Seat: 3,
+    Voucher: 4,
+    Membership: 5
+}
+
+
+def pg_lock_key(obj):
+    """
+    This maps the primary key space of multiple tables to a single bigint key space within postgres. It is not
+    an injective function, which is fine, as long as collisions are rare.
+    """
+    keyspace = KEY_SPACES.get(type(obj))
+    objectid = obj.pk
+    if not keyspace:
+        raise ValueError(f"No key space defined for locking objects of type {type(obj)}")
+    assert isinstance(objectid, int)
+    # 64bit int: xxxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxx xxxxxxx xxxxxxx xxxxxxx
+    #            |              objectid mod 2**48             | |index| |keysp.|
+    key = ((objectid % 281474976710656) << 16) | ((settings.DATABASE_ADVISORY_LOCK_INDEX % 256) << 8) | (keyspace % 256)
+    return key
+
+
+class LockTimeoutException(Exception):
+    pass
+
+
+def lock_objects(objects, *, shared_lock_objects=None, replace_exclusive_with_shared_when_exclusive_are_more_than=20):
+    """
+    Create an exclusive lock on the objects passed in `objects`. This function MUST be called within an atomic
+    transaction and SHOULD be called only once per transaction to prevent deadlocks.
+
+    A shared lock will be created on objects passed in `shared_lock_objects`.
+
+    If `objects` contains more than `replace_exclusive_with_shared_when_exclusive_are_more_than` objects, `objects`
+    will be ignored and `shared_lock_objects` will be used in its place and receive an exclusive lock.
+
+    The idea behind it is this: Usually we create a lock on every quota, voucher, or seat contained in an order.
+    However, this has a large performance penalty in case we have hundreds of locks required. Therefore, we always
+    place a shared lock in the event, and if we have too many affected objects, we fall back to event-level locks.
+    """
+    if (not objects and not shared_lock_objects) or 'skip-locking' in debugflags_var.get():
+        return
+
+    if 'fail-locking' in debugflags_var.get():
+        raise LockTimeoutException()
+
+    if not connection.in_atomic_block:
+        raise RuntimeError(
+            "You cannot create locks outside of an transaction"
+        )
+
+    if 'postgresql' in settings.DATABASES['default']['ENGINE']:
+        shared_keys = set(pg_lock_key(obj) for obj in shared_lock_objects) if shared_lock_objects else set()
+        exclusive_keys = set(pg_lock_key(obj) for obj in objects)
+        if replace_exclusive_with_shared_when_exclusive_are_more_than and len(exclusive_keys) > replace_exclusive_with_shared_when_exclusive_are_more_than:
+            exclusive_keys = shared_keys
+        keys = sorted(list(shared_keys | exclusive_keys))
+        calls = ", ".join([
+            (f"pg_advisory_xact_lock({k})" if k in exclusive_keys else f"pg_advisory_xact_lock_shared({k})") for k in keys
+        ])
+
+        try:
+            with connection.cursor() as cursor:
+                cursor.execute(f"SET LOCAL lock_timeout = '{LOCK_ACQUISITION_TIMEOUT}s';")
+                cursor.execute(f"SELECT {calls};")
+                cursor.execute("SET LOCAL lock_timeout = '0';")  # back to default
+        except DatabaseError as e:
+            logger.warning(f"Waiting for locks timed out: {e} on SELECT {calls};")
+            raise LockTimeoutException()
+
+    else:
+        for model, instances in groupby(objects, key=lambda o: type(o)):
+            model.objects.select_for_update().filter(pk__in=[o.pk for o in instances])
 
 
 class NoLockManager:
@@ -57,128 +131,3 @@ class NoLockManager:
     def __exit__(self, exc_type, exc_val, exc_tb):
         if exc_type is not None:
             return False
-
-
-class LockManager:
-    def __init__(self, event):
-        self.event = event
-
-    def __enter__(self):
-        lock_event(self.event)
-        return now()
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        release_event(self.event)
-        if exc_type is not None:
-            return False
-
-
-class LockTimeoutException(Exception):
-    pass
-
-
-class LockReleaseException(LockTimeoutException):
-    pass
-
-
-def lock_event(event):
-    """
-    Issue a lock on this event so nobody can book tickets for this event until
-    you release the lock. Will retry 5 times on failure.
-
-    :raises LockTimeoutException: if the event is locked every time we try
-                                  to obtain the lock
-    """
-    if hasattr(event, '_lock') and event._lock:
-        return True
-
-    if settings.HAS_REDIS:
-        return lock_event_redis(event)
-    else:
-        return lock_event_db(event)
-
-
-def release_event(event):
-    """
-    Release a lock placed by :py:meth:`lock()`. If the parameter force is not set to ``True``,
-    the lock will only be released if it was issued in _this_ python
-    representation of the database object.
-
-    :raises LockReleaseException: if we do not own the lock
-    """
-    if not hasattr(event, '_lock') or not event._lock:
-        raise LockReleaseException('Lock is not owned by this thread')
-    if settings.HAS_REDIS:
-        return release_event_redis(event)
-    else:
-        return release_event_db(event)
-
-
-def lock_event_db(event):
-    retries = 5
-    for i in range(retries):
-        with transaction.atomic():
-            dt = now()
-            l, created = EventLock.objects.get_or_create(event=event.id)
-            if created:
-                event._lock = l
-                return True
-            elif l.date < now() - timedelta(seconds=LOCK_TIMEOUT):
-                newtoken = str(uuid.uuid4())
-                updated = EventLock.objects.filter(event=event.id, token=l.token).update(date=dt, token=newtoken)
-                if updated:
-                    l.token = newtoken
-                    event._lock = l
-                    return True
-        time.sleep(2 ** i / 100)
-    raise LockTimeoutException()
-
-
-@transaction.atomic
-def release_event_db(event):
-    if not hasattr(event, '_lock') or not event._lock:
-        raise LockReleaseException('Lock is not owned by this thread')
-    try:
-        lock = EventLock.objects.get(event=event.id, token=event._lock.token)
-        lock.delete()
-        event._lock = None
-    except EventLock.DoesNotExist:
-        raise LockReleaseException('Lock is no longer owned by this thread')
-
-
-def redis_lock_from_event(event):
-    from django_redis import get_redis_connection
-    from redis.lock import Lock
-
-    if not hasattr(event, '_lock') or not event._lock:
-        rc = get_redis_connection("redis")
-        event._lock = Lock(redis=rc, name='pretix_event_%s' % event.id, timeout=LOCK_TIMEOUT)
-    return event._lock
-
-
-def lock_event_redis(event):
-    from redis.exceptions import RedisError
-
-    lock = redis_lock_from_event(event)
-    retries = 5
-    for i in range(retries):
-        try:
-            if lock.acquire(blocking=False):
-                return True
-        except RedisError:
-            logger.exception('Error locking an event')
-            raise LockTimeoutException()
-        time.sleep(2 ** i / 100)
-    raise LockTimeoutException()
-
-
-def release_event_redis(event):
-    from redis import RedisError
-
-    lock = redis_lock_from_event(event)
-    try:
-        lock.release()
-    except RedisError:
-        logger.exception('Error releasing an event lock')
-        raise LockReleaseException()
-    event._lock = None

src/pretix/base/services/mail.py

@@ -39,7 +39,6 @@ import mimetypes
 import os
 import re
 import smtplib
-import ssl
 import warnings
 from email.mime.image import MIMEImage
 from email.utils import formataddr
@@ -99,6 +98,9 @@ def clean_sender_name(sender_name: str) -> str:
     # Emails with @ in their sender name are rejected by some mailservers (e.g. Microsoft) because it looks like
     # a phishing attempt.
     sender_name = sender_name.replace("@", " ")
+    # Emails with : in their sender name are treated by Microsoft like emails with no From header at all, leading
+    # to a higher spam likelihood.
+    sender_name = sender_name.replace(":", " ")
 
     # Emails with excessively long sender names are rejected by some mailservers
     if len(sender_name) > 75:
@@ -597,7 +599,7 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
 
             raise SendMailException('Failed to send an email to {}.'.format(to))
         except Exception as e:
-            if isinstance(e, (smtplib.SMTPServerDisconnected, smtplib.SMTPConnectError, ssl.SSLError, OSError)):
+            if isinstance(e, OSError) and not isinstance(e, smtplib.SMTPNotSupportedError):
                 try:
                     self.retry(max_retries=5, countdown=[10, 30, 60, 300, 900, 900][self.request.retries])
                 except MaxRetriesExceededError:
@@ -606,7 +608,7 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                             'pretix.email.error',
                             data={
                                 'subject': 'Internal error',
-                                'message': 'Max retries exceeded',
+                                'message': f'Max retries exceeded after error "{str(e)}"',
                                 'recipient': '',
                                 'invoices': [],
                             }

src/pretix/base/services/media.py

@@ -0,0 +1,72 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+import secrets
+
+from django.db import IntegrityError
+from django.db.models import Q
+from django_scopes import scopes_disabled
+
+from pretix.base.models import GiftCardAcceptance
+from pretix.base.models.media import MediumKeySet
+
+
+def create_nfc_mf0aes_keyset(organizer):
+    for i in range(20):
+        public_id = secrets.randbelow(2 ** 32)
+        uid_key = secrets.token_bytes(16)
+        diversification_key = secrets.token_bytes(16)
+        try:
+            return MediumKeySet.objects.create(
+                organizer=organizer,
+                media_type="nfc_mf0aes",
+                public_id=public_id,
+                diversification_key=diversification_key,
+                uid_key=uid_key,
+                active=True,
+            )
+        except IntegrityError:  # either race condition with another thread or duplicate public ID
+            try:
+                return MediumKeySet.objects.get(
+                    organizer=organizer,
+                    media_type="nfc_mf0aes",
+                    active=True,
+                )
+            except MediumKeySet.DoesNotExist:
+                continue  # duplicate public ID, let's try again
+
+
+@scopes_disabled()
+def get_keysets_for_organizer(organizer):
+    sets = list(MediumKeySet.objects.filter(
+        Q(organizer=organizer) | Q(organizer__in=GiftCardAcceptance.objects.filter(
+            acceptor=organizer,
+            active=True,
+            reusable_media=True,
+        ).values_list("issuer_id", flat=True))
+    ))
+    if organizer.settings.reusable_media_type_nfc_mf0aes and not any(
+        ks.organizer == organizer and ks.media_type == "nfc_mf0aes" for ks in sets
+    ):
+        new_set = create_nfc_mf0aes_keyset(organizer)
+        if new_set:
+            sets.append(new_set)
+    return sets

src/pretix/base/services/orderimport.py

@@ -36,7 +36,7 @@ from pretix.base.models import (
 from pretix.base.models.orders import Transaction
 from pretix.base.orderimport import get_all_columns
 from pretix.base.services.invoices import generate_invoice, invoice_qualified
-from pretix.base.services.locking import NoLockManager
+from pretix.base.services.locking import lock_objects
 from pretix.base.services.tasks import ProfiledEventTask
 from pretix.base.signals import order_paid, order_placed
 from pretix.celery_app import app
@@ -54,14 +54,15 @@ class DataImportError(LazyLocaleException):
         super().__init__(msg)
 
 
-def parse_csv(file, length=None, mode="strict"):
+def parse_csv(file, length=None, mode="strict", charset=None):
     file.seek(0)
     data = file.read(length)
-    try:
-        import chardet
-        charset = chardet.detect(data)['encoding']
-    except ImportError:
-        charset = file.charset
+    if not charset:
+        try:
+            import chardet
+            charset = chardet.detect(data)['encoding']
+        except ImportError:
+            charset = file.charset
     data = data.decode(charset or "utf-8", mode)
     # If the file was modified on a Mac, it only contains \r as line breaks
     if '\r' in data and '\n' not in data:
@@ -85,13 +86,12 @@ def setif(record, obj, attr, setting):
 
 
 @app.task(base=ProfiledEventTask, throws=(DataImportError,))
-def import_orders(event: Event, fileid: str, settings: dict, locale: str, user) -> None:
+def import_orders(event: Event, fileid: str, settings: dict, locale: str, user, charset=None) -> None:
     cf = CachedFile.objects.get(id=fileid)
     user = User.objects.get(pk=user)
-    seats_used = False
     with language(locale, event.settings.region):
         cols = get_all_columns(event)
-        parsed = parse_csv(cf.file)
+        parsed = parse_csv(cf.file, charset=charset)
         orders = []
         order = None
         data = []
@@ -118,6 +118,7 @@ def import_orders(event: Event, fileid: str, settings: dict, locale: str, user)
 
         # Prepare model objects. Yes, this might consume lots of RAM, but allows us to make the actual SQL transaction
         # shorter. We'll see what works better in reality…
+        lock_seats = []
         for i, record in enumerate(data):
             try:
                 if order is None or settings['orders'] == 'many':
@@ -135,7 +136,7 @@ def import_orders(event: Event, fileid: str, settings: dict, locale: str, user)
                 position.attendee_name_parts = {'_scheme': event.settings.name_scheme}
                 position.meta_info = {}
                 if position.seat is not None:
-                    seats_used = True
+                    lock_seats.append(position.seat)
                 order._positions.append(position)
                 position.assign_pseudonymization_id()
 
@@ -147,12 +148,15 @@ def import_orders(event: Event, fileid: str, settings: dict, locale: str, user)
                     _('Invalid data in row {row}: {message}').format(row=i, message=str(e))
                 )
 
-        # We don't support vouchers, quotas, or memberships here, so we only need to lock if seats
-        # are in use
-        lockfn = event.lock if seats_used else NoLockManager
-
         try:
-            with lockfn(), transaction.atomic():
+            with transaction.atomic():
+                # We don't support vouchers, quotas, or memberships here, so we only need to lock if seats are in use
+                if lock_seats:
+                    lock_objects(lock_seats, shared_lock_objects=[event])
+                    for s in lock_seats:
+                        if not s.is_available():
+                            raise ImportError(_('The seat you selected has already been taken. Please select a different seat.'))
+
                 save_transactions = []
                 for o in orders:
                     o.total = sum([c.price for c in o._positions])  # currently no support for fees

src/pretix/base/services/orders.py

@@ -35,10 +35,13 @@
 
 import json
 import logging
+import operator
 import sys
 from collections import Counter, defaultdict, namedtuple
 from datetime import datetime, time, timedelta
 from decimal import Decimal
+from functools import reduce
+from time import sleep
 from typing import List, Optional
 
 from celery.exceptions import MaxRetriesExceededError
@@ -82,7 +85,9 @@ from pretix.base.services import tickets
 from pretix.base.services.invoices import (
     generate_cancellation, generate_invoice, invoice_qualified,
 )
-from pretix.base.services.locking import LockTimeoutException, NoLockManager
+from pretix.base.services.locking import (
+    LOCK_TRUST_WINDOW, LockTimeoutException, lock_objects,
+)
 from pretix.base.services.mail import SendMailException
 from pretix.base.services.memberships import (
     create_membership, validate_memberships_in_order,
@@ -102,6 +107,7 @@ from pretix.celery_app import app
 from pretix.helpers import OF_SELF
 from pretix.helpers.models import modelcopy
 from pretix.helpers.periodic import minimum_interval
+from pretix.testutils.middleware import debugflags_var
 
 
 class OrderError(Exception):
@@ -133,6 +139,8 @@ error_messages = {
         'meantime. Please see below for details.'
     ),
     'internal': gettext_lazy("An internal error occurred, please try again."),
+    'race_condition': gettext_lazy("This order was changed by someone else simultaneously. Please check if your "
+                                   "changes are still accurate and try again."),
     'empty': gettext_lazy("Your cart is empty."),
     'max_items_per_product': ngettext_lazy(
         "You cannot select more than %(max)s item of the product %(product)s. We removed the surplus items from your cart.",
@@ -209,9 +217,9 @@ def reactivate_order(order: Order, force: bool=False, user: User=None, auth=None
     if order.status != Order.STATUS_CANCELED:
         raise OrderError(_('The order was not canceled.'))
 
-    with order.event.lock() as now_dt:
-        is_available = order._is_still_available(now_dt, count_waitinglist=False, check_voucher_usage=True,
-                                                 check_memberships=True, force=force)
+    with transaction.atomic():
+        is_available = order._is_still_available(now(), count_waitinglist=False, check_voucher_usage=True,
+                                                 check_memberships=True, lock=True, force=force)
         if is_available is True:
             if order.payment_refund_sum >= order.total:
                 order.status = Order.STATUS_PAID
@@ -220,29 +228,28 @@ def reactivate_order(order: Order, force: bool=False, user: User=None, auth=None
             order.cancellation_date = None
             order.set_expires(now(),
                               order.event.subevents.filter(id__in=[p.subevent_id for p in order.positions.all()]))
-            with transaction.atomic():
-                order.save(update_fields=['expires', 'status', 'cancellation_date'])
-                order.log_action(
-                    'pretix.event.order.reactivated',
-                    user=user,
-                    auth=auth,
-                    data={
-                        'expires': order.expires,
-                    }
-                )
-                for position in order.positions.all():
-                    if position.voucher:
-                        Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') + 1))
+            order.save(update_fields=['expires', 'status', 'cancellation_date'])
+            order.log_action(
+                'pretix.event.order.reactivated',
+                user=user,
+                auth=auth,
+                data={
+                    'expires': order.expires,
+                }
+            )
+            for position in order.positions.all():
+                if position.voucher:
+                    Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') + 1))
 
-                    for gc in position.issued_gift_cards.all():
-                        gc = GiftCard.objects.select_for_update(of=OF_SELF).get(pk=gc.pk)
-                        gc.transactions.create(value=position.price, order=order, acceptor=order.event.organizer)
-                        break
+                for gc in position.issued_gift_cards.all():
+                    gc = GiftCard.objects.select_for_update(of=OF_SELF).get(pk=gc.pk)
+                    gc.transactions.create(value=position.price, order=order, acceptor=order.event.organizer)
+                    break
 
-                    for m in position.granted_memberships.all():
-                        m.canceled = False
-                        m.save()
-                order.create_transactions()
+                for m in position.granted_memberships.all():
+                    m.canceled = False
+                    m.save()
+            order.create_transactions()
         else:
             raise OrderError(is_available)
 
@@ -264,7 +271,6 @@ def extend_order(order: Order, new_date: datetime, force: bool=False, valid_if_p
     if new_date < now():
         raise OrderError(_('The new expiry date needs to be in the future.'))
 
-    @transaction.atomic
     def change(was_expired=True):
         old_date = order.expires
         order.expires = new_date
@@ -302,11 +308,11 @@ def extend_order(order: Order, new_date: datetime, force: bool=False, valid_if_p
                 generate_invoice(order)
             order.create_transactions()
 
-    if order.status == Order.STATUS_PENDING:
-        change(was_expired=False)
-    else:
-        with order.event.lock() as now_dt:
-            is_available = order._is_still_available(now_dt, count_waitinglist=False, force=force)
+    with transaction.atomic():
+        if order.status == Order.STATUS_PENDING:
+            change(was_expired=False)
+        else:
+            is_available = order._is_still_available(now(), count_waitinglist=False, lock=True, force=force)
             if is_available is True:
                 change(was_expired=True)
             else:
@@ -334,9 +340,8 @@ def mark_order_expired(order, user=None, auth=None):
             order = Order.objects.get(pk=order)
         if isinstance(user, int):
             user = User.objects.get(pk=user)
-        with order.event.lock():
-            order.status = Order.STATUS_EXPIRED
-            order.save(update_fields=['status'])
+        order.status = Order.STATUS_EXPIRED
+        order.save(update_fields=['status'])
 
         order.log_action('pretix.event.order.expired', user=user, auth=auth)
         i = order.invoices.filter(is_cancellation=False).last()
@@ -439,9 +444,8 @@ def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
         if not order.require_approval or not order.status == Order.STATUS_PENDING:
             raise OrderError(_('This order is not pending approval.'))
 
-        with order.event.lock():
-            order.status = Order.STATUS_CANCELED
-            order.save(update_fields=['status'])
+        order.status = Order.STATUS_CANCELED
+        order.save(update_fields=['status'])
 
         order.log_action('pretix.event.order.denied', user=user, auth=auth, data={
             'comment': comment
@@ -521,51 +525,49 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
                 m.save()
 
         if cancellation_fee:
-            with order.event.lock():
-                for position in order.positions.all():
-                    if position.voucher:
-                        Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
-                    position.canceled = True
-                    assign_ticket_secret(
-                        event=order.event, position=position, force_invalidate_if_revokation_list_used=True, force_invalidate=False, save=False
-                    )
-                    position.save(update_fields=['canceled', 'secret'])
-                new_fee = cancellation_fee
-                for fee in order.fees.all():
-                    if keep_fees and fee in keep_fees:
-                        new_fee -= fee.value
-                    else:
-                        fee.canceled = True
-                        fee.save(update_fields=['canceled'])
-
-                if new_fee:
-                    f = OrderFee(
-                        fee_type=OrderFee.FEE_TYPE_CANCELLATION,
-                        value=new_fee,
-                        tax_rule=order.event.settings.tax_rate_default,
-                        order=order,
-                    )
-                    f._calculate_tax()
-                    f.save()
-
-                if cancellation_fee > order.total:
-                    raise OrderError(_('The cancellation fee cannot be higher than the total amount of this order.'))
-                elif order.payment_refund_sum < cancellation_fee:
-                    order.status = Order.STATUS_PENDING
-                    order.set_expires()
+            for position in order.positions.all():
+                if position.voucher:
+                    Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
+                position.canceled = True
+                assign_ticket_secret(
+                    event=order.event, position=position, force_invalidate_if_revokation_list_used=True, force_invalidate=False, save=False
+                )
+                position.save(update_fields=['canceled', 'secret'])
+            new_fee = cancellation_fee
+            for fee in order.fees.all():
+                if keep_fees and fee in keep_fees:
+                    new_fee -= fee.value
                 else:
-                    order.status = Order.STATUS_PAID
-                order.total = cancellation_fee
-                order.cancellation_date = now()
-                order.save(update_fields=['status', 'cancellation_date', 'total'])
+                    fee.canceled = True
+                    fee.save(update_fields=['canceled'])
+
+            if new_fee:
+                f = OrderFee(
+                    fee_type=OrderFee.FEE_TYPE_CANCELLATION,
+                    value=new_fee,
+                    tax_rule=order.event.settings.tax_rate_default,
+                    order=order,
+                )
+                f._calculate_tax()
+                f.save()
+
+            if cancellation_fee > order.total:
+                raise OrderError(_('The cancellation fee cannot be higher than the total amount of this order.'))
+            elif order.payment_refund_sum < cancellation_fee:
+                order.status = Order.STATUS_PENDING
+                order.set_expires()
+            else:
+                order.status = Order.STATUS_PAID
+            order.total = cancellation_fee
+            order.cancellation_date = now()
+            order.save(update_fields=['status', 'cancellation_date', 'total'])
 
             if cancel_invoice and i:
                 invoices.append(generate_invoice(order))
         else:
-            with order.event.lock():
-                order.status = Order.STATUS_CANCELED
-                order.cancellation_date = now()
-                order.save(update_fields=['status', 'cancellation_date'])
+            order.status = Order.STATUS_CANCELED
+            order.cancellation_date = now()
+            order.save(update_fields=['status', 'cancellation_date'])
 
             for position in order.positions.all():
                 assign_ticket_secret(
@@ -666,6 +668,27 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
 
     sorted_positions = sorted(positions, key=lambda s: -int(s.is_bundled))
 
+    for cp in sorted_positions:
+        cp._cached_quotas = list(cp.quotas)
+
+    # Create locks
+    if any(cp.expires < now() + timedelta(seconds=LOCK_TRUST_WINDOW) for cp in sorted_positions):
+        # No need to perform any locking if the cart positions still guarantee everything long enough.
+        full_lock_required = any(
+            getattr(o, 'seat', False) for o in sorted_positions
+        ) and event.settings.seating_minimal_distance > 0
+        if full_lock_required:
+            # We lock the entire event in this case since we don't want to deal with fine-granular locking
+            # in the case of seating distance enforcement
+            lock_objects([event])
+        else:
+            lock_objects(
+                [q for q in reduce(operator.or_, (set(cp._cached_quotas) for cp in sorted_positions), set()) if q.size is not None] +
+                [op.voucher for op in sorted_positions if op.voucher] +
+                [op.seat for op in sorted_positions if op.seat],
+                shared_lock_objects=[event]
+            )
+
     # Check availability
     for i, cp in enumerate(sorted_positions):
         if cp.pk in deleted_positions:
@@ -675,7 +698,7 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
             err = err or error_messages['unavailable']
             delete(cp)
             continue
-        quotas = list(cp.quotas)
+        quotas = cp._cached_quotas
 
         products_seen[cp.item] += 1
         if cp.item.max_per_order and products_seen[cp.item] > cp.item.max_per_order:
@@ -689,6 +712,7 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
         if cp.voucher:
             v_usages[cp.voucher] += 1
             if cp.voucher not in v_avail:
+                cp.voucher.refresh_from_db(fields=['redeemed'])
                 redeemed_in_carts = CartPosition.objects.filter(
                     Q(voucher=cp.voucher) & Q(event=event) & Q(expires__gte=now_dt)
                 ).exclude(cart_id=cp.cart_id)
@@ -927,91 +951,87 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
     payments = []
     sales_channel = get_all_sales_channels()[sales_channel]
 
-    with transaction.atomic():
+    try:
+        validate_memberships_in_order(customer, positions, event, lock=True, testmode=event.testmode)
+    except ValidationError as e:
+        raise OrderError(e.message)
 
-        try:
-            validate_memberships_in_order(customer, positions, event, lock=True, testmode=event.testmode)
-        except ValidationError as e:
-            raise OrderError(e.message)
+    require_approval = any(p.requires_approval(invoice_address=address) for p in positions)
+    try:
+        fees = _get_fees(positions, payment_requests, address, meta_info, event, require_approval=require_approval)
+    except TaxRule.SaleNotAllowed:
+        raise OrderError(error_messages['country_blocked'])
+    total = pending_sum = sum([c.price for c in positions]) + sum([c.value for c in fees])
 
-        require_approval = any(p.requires_approval(invoice_address=address) for p in positions)
+    order = Order(
+        status=Order.STATUS_PENDING,
+        event=event,
+        email=email,
+        phone=(meta_info or {}).get('contact_form_data', {}).get('phone'),
+        datetime=now_dt,
+        locale=get_language_without_region(locale),
+        total=total,
+        testmode=True if sales_channel.testmode_supported and event.testmode else False,
+        meta_info=json.dumps(meta_info or {}),
+        require_approval=require_approval,
+        sales_channel=sales_channel.identifier,
+        customer=customer,
+        valid_if_pending=valid_if_pending,
+    )
+    if customer:
+        order.email_known_to_work = customer.is_verified
+    order.set_expires(now_dt, event.subevents.filter(id__in=[p.subevent_id for p in positions]))
+    order.save()
+
+    if address:
+        if address.order is not None:
+            address.pk = None
+        address.order = order
+        address.save()
+
+    for fee in fees:
+        fee.order = order
         try:
-            fees = _get_fees(positions, payment_requests, address, meta_info, event, require_approval=require_approval)
+            fee._calculate_tax()
         except TaxRule.SaleNotAllowed:
             raise OrderError(error_messages['country_blocked'])
-        total = pending_sum = sum([c.price for c in positions]) + sum([c.value for c in fees])
+        if fee.tax_rule and not fee.tax_rule.pk:
+            fee.tax_rule = None  # TODO: deprecate
+        fee.save()
 
-        order = Order(
-            status=Order.STATUS_PENDING,
-            event=event,
-            email=email,
-            phone=(meta_info or {}).get('contact_form_data', {}).get('phone'),
-            datetime=now_dt,
-            locale=get_language_without_region(locale),
-            total=total,
-            testmode=True if sales_channel.testmode_supported and event.testmode else False,
-            meta_info=json.dumps(meta_info or {}),
-            require_approval=require_approval,
-            sales_channel=sales_channel.identifier,
-            customer=customer,
-            valid_if_pending=valid_if_pending,
-        )
-        if customer:
-            order.email_known_to_work = customer.is_verified
-        order.set_expires(now_dt, event.subevents.filter(id__in=[p.subevent_id for p in positions]))
-        order.save()
+    # Safety check: Is the amount we're now going to charge the same amount the user has been shown when they
+    # pressed "Confirm purchase"? If not, we should better warn the user and show the confirmation page again.
+    # We used to have a *known* case where this happened is if a gift card is used in two concurrent sessions,
+    # but this is now a payment error instead. So currently this code branch is usually only triggered by bugs
+    # in other places (e.g. tax calculation).
+    if shown_total is not None:
+        if Decimal(shown_total) != pending_sum:
+            raise OrderError(
+                _('While trying to place your order, we noticed that the order total has changed. Either one of '
+                  'the prices changed just now, or a gift card you used has been used in the meantime. Please '
+                  'check the prices below and try again.')
+            )
 
-        if address:
-            if address.order is not None:
-                address.pk = None
-            address.order = order
-            address.save()
+    if payment_requests and not order.require_approval:
+        for p in payment_requests:
+            if not p.get('multi_use_supported') or p['payment_amount'] > Decimal('0.00'):
+                payments.append(order.payments.create(
+                    state=OrderPayment.PAYMENT_STATE_CREATED,
+                    provider=p['provider'],
+                    amount=p['payment_amount'],
+                    fee=p.get('fee'),
+                    info=json.dumps(p['info_data']),
+                    process_initiated=False,
+                ))
 
-            order.save()
-
-        for fee in fees:
-            fee.order = order
-            try:
-                fee._calculate_tax()
-            except TaxRule.SaleNotAllowed:
-                raise OrderError(error_messages['country_blocked'])
-            if fee.tax_rule and not fee.tax_rule.pk:
-                fee.tax_rule = None  # TODO: deprecate
-            fee.save()
-
-        # Safety check: Is the amount we're now going to charge the same amount the user has been shown when they
-        # pressed "Confirm purchase"? If not, we should better warn the user and show the confirmation page again.
-        # We used to have a *known* case where this happened is if a gift card is used in two concurrent sessions,
-        # but this is now a payment error instead. So currently this code branch is usually only triggered by bugs
-        # in other places (e.g. tax calculation).
-        if shown_total is not None:
-            if Decimal(shown_total) != pending_sum:
-                raise OrderError(
-                    _('While trying to place your order, we noticed that the order total has changed. Either one of '
-                      'the prices changed just now, or a gift card you used has been used in the meantime. Please '
-                      'check the prices below and try again.')
-                )
-
-        if payment_requests and not order.require_approval:
-            for p in payment_requests:
-                if not p.get('multi_use_supported') or p['payment_amount'] > Decimal('0.00'):
-                    payments.append(order.payments.create(
-                        state=OrderPayment.PAYMENT_STATE_CREATED,
-                        provider=p['provider'],
-                        amount=p['payment_amount'],
-                        fee=p.get('fee'),
-                        info=json.dumps(p['info_data']),
-                        process_initiated=False,
-                    ))
-
-        orderpositions = OrderPosition.transform_cart_positions(positions, order)
-        order.create_transactions(positions=orderpositions, fees=fees, is_new=True)
-        order.log_action('pretix.event.order.placed')
-        if order.require_approval:
-            order.log_action('pretix.event.order.placed.require_approval')
-        if meta_info:
-            for msg in meta_info.get('confirm_messages', []):
-                order.log_action('pretix.event.order.consent', data={'msg': msg})
+    orderpositions = OrderPosition.transform_cart_positions(positions, order)
+    order.create_transactions(positions=orderpositions, fees=fees, is_new=True)
+    order.log_action('pretix.event.order.placed')
+    if order.require_approval:
+        order.log_action('pretix.event.order.placed.require_approval')
+    if meta_info:
+        for msg in meta_info.get('confirm_messages', []):
+            order.log_action('pretix.event.order.consent', data={'msg': msg})
 
     order_placed.send(event, order=order)
     return order, payments
@@ -1116,18 +1136,12 @@ def _perform_order(event: Event, payment_requests: List[dict], position_ids: Lis
         if result:
             valid_if_pending = True
 
-    lockfn = NoLockManager
-    locked = False
-    if positions.filter(Q(voucher__isnull=False) | Q(expires__lt=now() + timedelta(minutes=2)) | Q(seat__isnull=False)).exists():
-        # Performance optimization: If no voucher is used and no cart position is dangerously close to its expiry date,
-        # creating this order shouldn't be prone to any race conditions and we don't need to lock the event.
-        locked = True
-        lockfn = event.lock
-
     warnings = []
     any_payment_failed = False
 
-    with lockfn() as now_dt:
+    now_dt = now()
+    err_out = None
+    with transaction.atomic(durable=True):
         positions = list(
             positions.select_related('item', 'variation', 'subevent', 'seat', 'addon_to').prefetch_related('addons')
         )
@@ -1136,16 +1150,28 @@ def _perform_order(event: Event, payment_requests: List[dict], position_ids: Lis
             raise OrderError(error_messages['empty'])
         if len(position_ids) != len(positions):
             raise OrderError(error_messages['internal'])
-        _check_positions(event, now_dt, positions, address=addr, sales_channel=sales_channel, customer=customer)
-        order, payment_objs = _create_order(event, email, positions, now_dt, payment_requests,
-                                            locale=locale, address=addr, meta_info=meta_info, sales_channel=sales_channel,
-                                            shown_total=shown_total, customer=customer, valid_if_pending=valid_if_pending)
         try:
-            for p in payment_objs:
-                if p.provider == 'free':
-                    p.confirm(send_mail=False, lock=not locked, generate_invoice=False)
-        except Quota.QuotaExceededException:
-            pass
+            _check_positions(event, now_dt, positions, address=addr, sales_channel=sales_channel, customer=customer)
+        except OrderError as e:
+            err_out = e  # Don't raise directly to make sure transaction is committed, as it might have deleted things
+        else:
+            if 'sleep-after-quota-check' in debugflags_var.get():
+                sleep(2)
+
+            order, payment_objs = _create_order(event, email, positions, now_dt, payment_requests,
+                                                locale=locale, address=addr, meta_info=meta_info, sales_channel=sales_channel,
+                                                shown_total=shown_total, customer=customer, valid_if_pending=valid_if_pending)
+
+            try:
+                for p in payment_objs:
+                    if p.provider == 'free':
+                        # Passing lock=False is safe here because it's absolutely impossible for the order to be expired
+                        # here before it is even committed.
+                        p.confirm(send_mail=False, lock=False, generate_invoice=False)
+            except Quota.QuotaExceededException:
+                pass
+    if err_out:
+        raise err_out
 
     # We give special treatment to GiftCardPayment here because our invoice renderer expects gift cards to already be
     # processed, and because we historically treat gift card orders like free orders with regards to email texts.
@@ -1289,9 +1315,19 @@ def send_expiry_warnings(sender, **kwargs):
     event_id = None
 
     for o in Order.objects.filter(
-        expires__gte=today, expiry_reminder_sent=False, status=Order.STATUS_PENDING,
-        datetime__lte=now() - timedelta(hours=2), require_approval=False
+            expires__gte=today, expiry_reminder_sent=False, status=Order.STATUS_PENDING,
+            datetime__lte=now() - timedelta(hours=2), require_approval=False
     ).only('pk', 'event_id', 'expires').order_by('event_id'):
+
+        lp = o.payments.last()
+        if (
+                lp and
+                lp.state in [OrderPayment.PAYMENT_STATE_CREATED, OrderPayment.PAYMENT_STATE_PENDING] and
+                lp.payment_provider and
+                lp.payment_provider.prevent_reminder_mail(o, lp)
+        ):
+            continue
+
         if event_id != o.event_id:
             settings = o.event.settings
             days = cache.get_or_set('{}:{}:setting_mail_days_order_expire_warning'.format('event', o.event_id),
@@ -1960,7 +1996,7 @@ class OrderChangeManager:
                     for a in current_addons[cp][k][:current_num - input_num]:
                         if a.canceled:
                             continue
-                        if a.checkins.exists():
+                        if a.checkins.filter(list__consider_tickets_used=True).exists():
                             raise OrderError(
                                 error_messages['addon_already_checked_in'] % {
                                     'addon': str(a.item.name),
@@ -2476,6 +2512,11 @@ class OrderChangeManager:
             split_order.status = Order.STATUS_PAID
         else:
             split_order.status = Order.STATUS_PENDING
+            if self.order.status == Order.STATUS_PAID:
+                split_order.set_expires(
+                    now(),
+                    list(set(p.subevent_id for p in split_positions))
+                )
         split_order.save()
 
         if offset_amount > Decimal('0.00'):
@@ -2643,6 +2684,19 @@ class OrderChangeManager:
         except ValidationError as e:
             raise OrderError(e.message)
 
+    def _create_locks(self):
+        full_lock_required = any(diff > 0 for diff in self._seatdiff.values()) and self.event.settings.seating_minimal_distance > 0
+        if full_lock_required:
+            # We lock the entire event in this case since we don't want to deal with fine-granular locking
+            # in the case of seating distance enforcement
+            lock_objects([self.event])
+        else:
+            lock_objects(
+                [q for q, d in self._quotadiff.items() if q.size is not None and d > 0] +
+                [s for s, d in self._seatdiff.items() if d > 0],
+                shared_lock_objects=[self.event]
+            )
+
     def commit(self, check_quotas=True):
         if self._committed:
             # an order change can only be committed once
@@ -2662,17 +2716,21 @@ class OrderChangeManager:
         self._payment_fee_diff()
 
         with transaction.atomic():
-            with self.order.event.lock():
-                if self.order.status in (Order.STATUS_PENDING, Order.STATUS_PAID):
-                    if check_quotas:
-                        self._check_quotas()
-                    self._check_seats()
-                self._check_complete_cancel()
-                self._check_and_lock_memberships()
-                try:
-                    self._perform_operations()
-                except TaxRule.SaleNotAllowed:
-                    raise OrderError(self.error_messages['tax_rule_country_blocked'])
+            locked_instance = Order.objects.select_for_update(of=OF_SELF).get(pk=self.order.pk)
+            if locked_instance.last_modified != self.order.last_modified:
+                raise OrderError(error_messages['race_condition'])
+
+            if self.order.status in (Order.STATUS_PENDING, Order.STATUS_PAID):
+                if check_quotas:
+                    self._check_quotas()
+                self._check_seats()
+            self._create_locks()
+            self._check_complete_cancel()
+            self._check_and_lock_memberships()
+            try:
+                self._perform_operations()
+            except TaxRule.SaleNotAllowed:
+                raise OrderError(self.error_messages['tax_rule_country_blocked'])
             self._recalculate_total_and_payment_fee()
             self._check_paid_price_change()
             self._check_paid_to_free()

src/pretix/base/services/pricing.py

@@ -171,7 +171,7 @@ def apply_discounts(event: Event, sales_channel: str,
         Q(available_until__isnull=True) | Q(available_until__gte=now()),
         sales_channels__contains=sales_channel,
         active=True,
-    ).prefetch_related('condition_limit_products').order_by('position', 'pk')
+    ).prefetch_related('condition_limit_products', 'benefit_limit_products').order_by('position', 'pk')
     for discount in discount_qs:
         result = discount.apply({
             idx: (item_id, subevent_id, line_price_gross, is_addon_to, voucher_discount)

src/pretix/base/services/quotas.py

@@ -24,13 +24,13 @@ import time
 from collections import Counter, defaultdict
 from itertools import zip_longest
 
+import django_redis
 from django.conf import settings
 from django.db import models
 from django.db.models import (
     Case, Count, F, Func, Max, OuterRef, Q, Subquery, Sum, Value, When,
 )
 from django.utils.timezone import now
-from django_redis import get_redis_connection
 
 from pretix.base.models import (
     CartPosition, Checkin, Order, OrderPosition, Quota, Voucher,
@@ -102,6 +102,12 @@ class QuotaAvailability:
         self.count_waitinglist = defaultdict(int)
         self.count_cart = defaultdict(int)
 
+        self._cache_key_suffix = ""
+        if not self._count_waitinglist:
+            self._cache_key_suffix += ":nocw"
+        if self._ignore_closed:
+            self._cache_key_suffix += ":igcl"
+
         self.sizes = {}
 
     def queue(self, *quota):
@@ -121,17 +127,14 @@ class QuotaAvailability:
             if self._full_results:
                 raise ValueError("You cannot combine full_results and allow_cache.")
 
-            elif not self._count_waitinglist:
-                raise ValueError("If you set allow_cache, you need to set count_waitinglist.")
-
             elif settings.HAS_REDIS:
-                rc = get_redis_connection("redis")
+                rc = django_redis.get_redis_connection("redis")
                 quotas_by_event = defaultdict(list)
                 for q in [_q for _q in self._queue if _q.id in quota_ids_set]:
                     quotas_by_event[q.event_id].append(q)
 
                 for eventid, evquotas in quotas_by_event.items():
-                    d = rc.hmget(f'quotas:{eventid}:availabilitycache', [str(q.pk) for q in evquotas])
+                    d = rc.hmget(f'quotas:{eventid}:availabilitycache{self._cache_key_suffix}', [str(q.pk) for q in evquotas])
                     for redisval, q in zip(d, evquotas):
                         if redisval is not None:
                             data = [rv for rv in redisval.decode().split(',')]
@@ -164,12 +167,12 @@ class QuotaAvailability:
         if not settings.HAS_REDIS or not quotas:
             return
 
-        rc = get_redis_connection("redis")
+        rc = django_redis.get_redis_connection("redis")
         # We write the computed availability to redis in a per-event hash as
         #
         #   quota_id -> (availability_state, availability_number, timestamp).
         #
-        # We store this in a hash instead of inidividual values to avoid making two many redis requests
+        # We store this in a hash instead of individual values to avoid making too many redis requests
         # which would introduce latency.
 
         # The individual entries in the hash are "valid" for 120 seconds. This means in a typical peak scenario with
@@ -179,16 +182,16 @@ class QuotaAvailability:
         # these quotas. We choose 10 seconds since that should be well above the duration of a write.
 
         lock_name = '_'.join([str(p) for p in sorted([q.pk for q in quotas])])
-        if rc.exists(f'quotas:availabilitycachewrite:{lock_name}'):
+        if rc.exists(f'quotas:availabilitycachewrite:{lock_name}{self._cache_key_suffix}'):
             return
-        rc.setex(f'quotas:availabilitycachewrite:{lock_name}', '1', 10)
+        rc.setex(f'quotas:availabilitycachewrite:{lock_name}{self._cache_key_suffix}', '1', 10)
 
         update = defaultdict(list)
         for q in quotas:
             update[q.event_id].append(q)
 
         for eventid, quotas in update.items():
-            rc.hmset(f'quotas:{eventid}:availabilitycache', {
+            rc.hset(f'quotas:{eventid}:availabilitycache{self._cache_key_suffix}', mapping={
                 str(q.id): ",".join(
                     [str(i) for i in self.results[q]] +
                     [str(int(time.time()))]
@@ -197,7 +200,7 @@ class QuotaAvailability:
             # To make sure old events do not fill up our redis instance, we set an expiry on the cache. However, we set it
             # on 7 days even though we mostly ignore values older than 2 monites. The reasoning is that we have some places
             # where we set allow_cache_stale and use the old entries anyways to save on performance.
-            rc.expire(f'quotas:{eventid}:availabilitycache', 3600 * 24 * 7)
+            rc.expire(f'quotas:{eventid}:availabilitycache{self._cache_key_suffix}', 3600 * 24 * 7)
 
         # We used to also delete item_quota_cache:* from the event cache here, but as the cache
         # gets more complex, this does not seem worth it. The cache is only present for up to

src/pretix/base/services/waitinglist.py

@@ -22,15 +22,19 @@
 import sys
 from datetime import timedelta
 
-from django.db.models import Exists, F, OuterRef, Q, Sum
+from django.db import transaction
+from django.db.models import (
+    Exists, F, OuterRef, Prefetch, Q, Sum, prefetch_related_objects,
+)
 from django.dispatch import receiver
 from django.utils.timezone import now
 from django_scopes import scopes_disabled
 
 from pretix.base.models import (
-    Event, SeatCategoryMapping, User, WaitingListEntry,
+    Event, EventMetaValue, SeatCategoryMapping, User, WaitingListEntry,
 )
 from pretix.base.models.waitinglist import WaitingListException
+from pretix.base.services.locking import lock_objects
 from pretix.base.services.tasks import EventTask
 from pretix.base.signals import periodic_task
 from pretix.celery_app import app
@@ -59,8 +63,21 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
         ).aggregate(free=Sum(F('max_usages') - F('redeemed')))['free'] or 0
         seats_available[(m.product_id, m.subevent_id)] = num_free_seets_for_product - num_valid_vouchers_for_product
 
-    qs = WaitingListEntry.objects.filter(
-        event=event, voucher__isnull=True
+    prefetch_related_objects(
+        [event.organizer],
+        'meta_properties'
+    )
+    prefetch_related_objects(
+        [event],
+        Prefetch(
+            'meta_values',
+            EventMetaValue.objects.select_related('property'),
+            to_attr='meta_values_cached'
+        )
+    )
+
+    qs = event.waitinglistentries.filter(
+        voucher__isnull=True
     ).select_related('item', 'variation', 'subevent').prefetch_related(
         'item__quotas', 'variation__quotas'
     ).order_by('-priority', 'created')
@@ -71,11 +88,23 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
 
     sent = 0
 
-    with event.lock():
+    with transaction.atomic(durable=True):
+        quotas_by_item = {}
+        quotas = set()
+        for wle in qs:
+            if (wle.item_id, wle.variation_id, wle.subevent_id) not in quotas_by_item:
+                quotas_by_item[wle.item_id, wle.variation_id, wle.subevent_id] = list(
+                    wle.variation.quotas.filter(subevent=wle.subevent)
+                    if wle.variation
+                    else wle.item.quotas.filter(subevent=wle.subevent)
+                )
+            wle._quotas = quotas_by_item[wle.item_id, wle.variation_id, wle.subevent_id]
+            quotas |= set(wle._quotas)
+
+        lock_objects(quotas, shared_lock_objects=[event])
         for wle in qs:
             if (wle.item, wle.variation, wle.subevent) in gone:
                 continue
-
             ev = (wle.subevent or event)
             if not ev.presale_is_running or (wle.subevent and not wle.subevent.active):
                 continue
@@ -90,9 +119,6 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
                     gone.add((wle.item, wle.variation, wle.subevent))
                     continue
 
-            quotas = (wle.variation.quotas.filter(subevent=wle.subevent)
-                      if wle.variation
-                      else wle.item.quotas.filter(subevent=wle.subevent))
             availability = (
                 wle.variation.check_quotas(count_waitinglist=False, _cache=quota_cache, subevent=wle.subevent)
                 if wle.variation
@@ -106,7 +132,7 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
                     continue
 
                 # Reduce affected quotas in cache
-                for q in quotas:
+                for q in wle._quotas:
                     quota_cache[q.pk] = (
                         quota_cache[q.pk][0] if quota_cache[q.pk][0] > 1 else 0,
                         quota_cache[q.pk][1] - 1 if quota_cache[q.pk][1] is not None else sys.maxsize

src/pretix/base/shredder.py

@@ -210,6 +210,8 @@ def slow_delete(qs, batch_size=1000, sleep_time=.5, progress_callback=None, prog
             break
         if total_deleted >= 0.8 * batch_size:
             time.sleep(sleep_time)
+        if progress_callback and progress_total:
+            progress_callback((progress_offset + total_deleted) / progress_total)
     return total_deleted
 
 

src/pretix/base/signals.py

@@ -683,12 +683,16 @@ dictionaries as values that contain keys like in the following example::
         "product": {
             "label": _("Product name"),
             "editor_sample": _("Sample product"),
-            "evaluate": lambda orderposition, order, event: str(orderposition.item)
+            "evaluate": lambda orderposition, order, event: str(orderposition.item),
+            "evaluate_bulk": lambda orderpositions: [str(op.item) for op in orderpositions],
         }
     }
 
 The ``evaluate`` member will be called with the order position, order and event as arguments. The event might
 also be a subevent, if applicable.
+
+The ``evaluate_bulk`` member is optional but can significantly improve performance in some situations because you
+can perform database fetches in bulk instead of single queries for every position.
 """
 
 

src/pretix/base/templatetags/rich_text.py

@@ -292,7 +292,7 @@ class LinkifyAndCleanExtension(Extension):
         )
 
 
-def markdown_compile_email(source):
+def markdown_compile_email(source, allowed_tags=ALLOWED_TAGS, allowed_attributes=ALLOWED_ATTRIBUTES):
     linker = bleach.Linker(
         url_re=URL_RE,
         email_re=EMAIL_RE,
@@ -306,8 +306,8 @@ def markdown_compile_email(source):
             EmailNl2BrExtension(),
             LinkifyAndCleanExtension(
                 linker,
-                tags=ALLOWED_TAGS,
-                attributes=ALLOWED_ATTRIBUTES,
+                tags=allowed_tags,
+                attributes=allowed_attributes,
                 protocols=ALLOWED_PROTOCOLS,
                 strip=False,
             )

src/pretix/base/timeframes.py

@@ -394,6 +394,8 @@ class SerializerDateFrameField(serializers.CharField):
             resolve_timeframe_to_dates_inclusive(now(), data, timezone.utc)
         except:
             raise ValidationError("Invalid date frame")
+        else:
+            return data
 
     def to_representation(self, value):
         if value is None:

src/pretix/base/views/applepay.py

@@ -0,0 +1,53 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from django.http import Http404, HttpResponse
+
+from pretix.base.settings import GlobalSettingsObject
+
+
+def association(request, *args, **kwargs):
+    # This is a crutch to enable event- or organizer-level overrides for the default
+    # ApplePay MerchantID domain validation/association file.
+    # We do not provide any FormFields for this on purpose!
+    #
+    # Please refer to https://github.com/pretix/pretix/pull/3611 to get updates on
+    # the upcoming and official way to temporarily override the association-file,
+    # which will make sure that there are no conflicting requests at the same time.
+    #
+    # Should you opt to manually inject a different association-file into an organizer
+    # or event settings store, we do recommend to remove the setting once you're
+    # done and the domain has been validated.
+    #
+    # If you do not need Stripe's default domain association credential and would
+    # rather serve a different default credential, you can do so through the
+    # Global Settings editor.
+    if hasattr(request, 'event'):
+        settings = request.event.settings
+    elif hasattr(request, 'organizer'):
+        settings = request.organizer.settings
+    else:
+        settings = GlobalSettingsObject().settings
+
+    if not settings.get('apple_domain_association', None):
+        raise Http404('')
+    else:
+        return HttpResponse(settings.get('apple_domain_association'))

src/pretix/base/views/tasks.py

@@ -20,6 +20,8 @@
 # <https://www.gnu.org/licenses/>.
 #
 import logging
+from collections import defaultdict
+from datetime import timedelta
 from importlib import import_module
 from zoneinfo import ZoneInfo
 
@@ -29,17 +31,20 @@ from celery.result import AsyncResult
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import PermissionDenied, ValidationError
+from django.core.files.uploadedfile import UploadedFile
+from django.db import transaction
 from django.http import HttpResponse, JsonResponse, QueryDict
 from django.shortcuts import redirect, render
 from django.test import RequestFactory
 from django.utils import timezone, translation
-from django.utils.timezone import get_current_timezone
+from django.utils.datastructures import MultiValueDict
+from django.utils.timezone import get_current_timezone, now
 from django.utils.translation import get_language, gettext as _
 from django.views import View
 from django.views.generic import FormView
 from redis import ResponseError
 
-from pretix.base.models import User
+from pretix.base.models import CachedFile, User
 from pretix.base.services.tasks import ProfiledEventTask
 from pretix.celery_app import app
 
@@ -217,6 +222,7 @@ class AsyncFormView(AsyncMixin, FormView):
     known_errortypes = ['ValidationError']
     expected_exceptions = (ValidationError,)
     task_base = ProfiledEventTask
+    atomic_execute = False
 
     def async_set_progress(self, percentage):
         if not self._task_self.request.called_directly:
@@ -226,15 +232,39 @@ class AsyncFormView(AsyncMixin, FormView):
             )
 
     def __init_subclass__(cls):
+        class StoredUploadedFile(UploadedFile):
+            pass
+
         def async_execute(self, *, request_path, query_string, form_kwargs, locale, tz, url_kwargs=None, url_args=None,
                           organizer=None, event=None, user=None, session_key=None):
             view_instance = cls()
             form_kwargs['data'] = QueryDict(form_kwargs['data'])
+
+            if form_kwargs['files']:
+                for k, l in form_kwargs['files'].items():
+                    uploadedfiles = []
+                    for cfid in l:
+                        cf = CachedFile.objects.get(pk=cfid)
+                        uploadedfiles.append(StoredUploadedFile(
+                            file=cf.file,
+                            name=cf.filename,
+                            content_type=cf.type,
+                            size=cf.file.size,
+                            charset=None,
+                            content_type_extra=None,
+                        ))
+
+                    form_kwargs['files'][k] = uploadedfiles
+                form_kwargs['files'] = MultiValueDict(form_kwargs['files'])
+
             req = RequestFactory().post(
                 request_path + '?' + query_string,
                 data=form_kwargs['data'].urlencode(),
                 content_type='application/x-www-form-urlencoded'
             )
+            if form_kwargs['files']:
+                req._load_post_and_files()
+                req._files = form_kwargs['files']
             view_instance.request = req
             view_instance.kwargs = url_kwargs
             view_instance.args = url_args
@@ -263,6 +293,9 @@ class AsyncFormView(AsyncMixin, FormView):
                 form.is_valid()
                 return view_instance.async_form_valid(self, form)
 
+        if cls.atomic_execute:
+            async_execute = transaction.atomic(async_execute)
+
         cls.async_execute = app.task(
             base=cls.task_base,
             bind=True,
@@ -282,8 +315,19 @@ class AsyncFormView(AsyncMixin, FormView):
         return super().get(request, *args, **kwargs)
 
     def form_valid(self, form):
-        if form.files:
-            raise TypeError('File upload currently not supported in AsyncFormView')
+        files = defaultdict(list)
+        if self.request.FILES:
+            for k, v in self.request.FILES.items():
+                cf = CachedFile.objects.create(
+                    expires=now() + timedelta(hours=2),
+                    date=now(),
+                    web_download=False,
+                    filename=v.name,
+                    type=v.content_type,
+                )
+                cf.file.save('uploaded_file.dat', v)
+                files[k].append(str(cf.pk))
+
         form_kwargs = {
             k: v for k, v in self.get_form_kwargs().items()
         }
@@ -294,6 +338,7 @@ class AsyncFormView(AsyncMixin, FormView):
                 form_kwargs['instance'] = None
         form_kwargs.setdefault('data', QueryDict())
         form_kwargs['data'] = form_kwargs['data'].urlencode()
+        form_kwargs['files'] = files
         form_kwargs['initial'] = {}
         form_kwargs.pop('event', None)
         kwargs = {

src/pretix/control/forms/__init__.py

@@ -44,6 +44,7 @@ from django.forms.utils import from_current_timezone
 from django.urls import reverse
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
+from django.utils.text import format_lazy
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _
 from django_scopes.forms import SafeModelMultipleChoiceField
@@ -51,6 +52,7 @@ from django_scopes.forms import SafeModelMultipleChoiceField
 from pretix.helpers.hierarkey import clean_filename
 
 from ...base.forms import I18nModelForm
+from ...helpers.i18n import get_language_score
 from ...helpers.images import (
     IMAGE_EXTS, validate_uploaded_file_for_valid_image,
 )
@@ -127,7 +129,7 @@ class ClearableBasenameFileInput(forms.ClearableFileInput):
 
         @property
         def is_img(self):
-            return any(self.file.name.lower().endswith(e) for e in ('.jpg', '.jpeg', '.png', '.gif'))
+            return any(self.file.name.lower().endswith(e) for e in settings.FILE_UPLOAD_EXTENSIONS_IMAGE)
 
         def __str__(self):
             if hasattr(self.file, 'display_name'):
@@ -217,15 +219,17 @@ class ExtValidationMixin:
 
     def clean(self, *args, **kwargs):
         data = super().clean(*args, **kwargs)
-        if isinstance(data, UploadedFile):
-            filename = data.name
+
+        from ...base.models import CachedFile
+        if isinstance(data, (UploadedFile, CachedFile)):
+            filename = data.name if isinstance(data, UploadedFile) else data.filename
             ext = os.path.splitext(filename)[1]
             ext = ext.lower()
             if ext not in self.ext_whitelist:
                 raise forms.ValidationError(_("Filetype not allowed!"))
 
             if ext in IMAGE_EXTS:
-                validate_uploaded_file_for_valid_image(data)
+                validate_uploaded_file_for_valid_image(data if isinstance(data, UploadedFile) else data.file)
 
         return data
 
@@ -255,6 +259,12 @@ class CachedFileField(ExtFileField):
         if isinstance(data, File):
             if hasattr(data, '_uploaded_to'):
                 return data._uploaded_to
+
+            try:
+                self.clean(data)
+            except ValidationError:
+                return None
+
             cf = CachedFile.objects.create(
                 expires=now() + datetime.timedelta(days=1),
                 date=now(),
@@ -266,6 +276,9 @@ class CachedFileField(ExtFileField):
             cf.save()
             data._uploaded_to = cf
             return cf
+        if isinstance(data, CachedFile):
+            return data
+
         return super().bound_data(data, initial)
 
     def clean(self, *args, **kwargs):
@@ -300,18 +313,44 @@ class SlugWidget(forms.TextInput):
 
 
 class MultipleLanguagesWidget(forms.CheckboxSelectMultiple):
+    template_name = 'pretixcontrol/multi_languages_select.html'
     option_template_name = 'pretixcontrol/multi_languages_widget.html'
 
     def sort(self):
-        self.choices = sorted(self.choices, key=lambda l: (
+        def filter_and_sort(choices, languages, cond=True):
+            return sorted(
+                [c for c in choices if (c[0] in languages) == cond],
+                key=lambda c: str(c[1])
+            )
+        self.choices = (
             (
-                0 if l[0] in settings.LANGUAGES_OFFICIAL
-                else (
-                    1 if l[0] not in settings.LANGUAGES_INCUBATING
-                    else 2
-                )
-            ), str(l[1])
-        ))
+                '',
+                filter_and_sort(self.choices, settings.LANGUAGES_OFFICIAL)
+            ),
+            (
+                (
+                    _('Community translations'),
+                    format_lazy(
+                        _('These translations are not maintained by the pretix team. We cannot vouch for their correctness '
+                            'and new or recently changed features might not be translated and will show in English instead. '
+                            'You can <a href="{translate_url}" target="_blank">help translating</a>.'),
+                        translate_url='https://translate.pretix.eu'
+                    ),
+                    'fa fa-group'
+                ),
+                filter_and_sort(self.choices, settings.LANGUAGES_OFFICIAL.union(settings.LANGUAGES_INCUBATING), False)
+            ),
+            (
+                (
+                    _('Development only'),
+                    _('These translations are still in progress. These languages can currently only be selected on development '
+                        'installations of pretix, not in production.'),
+                    'fa fa-flask text-danger'
+                ),
+                filter_and_sort(self.choices, settings.LANGUAGES_INCUBATING)
+            )
+        )
+        self.choices = [c for c in self.choices if len(c[1])]
 
     def options(self, name, value, attrs=None):
         self.sort()
@@ -325,6 +364,8 @@ class MultipleLanguagesWidget(forms.CheckboxSelectMultiple):
         opt = super().create_option(name, value, label, selected, index, subindex, attrs)
         opt['official'] = value in settings.LANGUAGES_OFFICIAL
         opt['incubating'] = value in settings.LANGUAGES_INCUBATING
+        base_score = get_language_score("de")
+        opt['score'] = round(get_language_score(value) / base_score * 100)
         return opt
 
 

src/pretix/control/forms/checkin.py

@@ -32,6 +32,7 @@ from django_scopes.forms import (
 
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.forms.widgets import SplitDateTimePickerWidget
+from pretix.base.models import Gate
 from pretix.base.models.checkin import Checkin, CheckinList
 from pretix.control.forms import ItemMultipleChoiceField
 from pretix.control.forms.widgets import Select2
@@ -112,6 +113,8 @@ class CheckinListForm(forms.ModelForm):
             'gates',
             'exit_all_at',
             'addon_match',
+            'consider_tickets_used',
+            'ignore_in_statistics',
         ]
         widgets = {
             'limit_products': forms.CheckboxSelectMultiple(attrs={
@@ -201,3 +204,26 @@ class CheckinListSimulatorForm(forms.Form):
         initial=True,
         required=False,
     )
+    gate = SafeModelChoiceField(
+        label=_('Gate'),
+        empty_label=_('All gates'),
+        queryset=Gate.objects.none(),
+        required=False
+    )
+
+    def __init__(self, *args, **kwargs):
+        self.event = kwargs.pop('event')
+        super().__init__(*args, **kwargs)
+
+        self.fields['gate'].queryset = self.event.organizer.gates.all()
+        self.fields['gate'].widget = Select2(
+            attrs={
+                'data-model-select2': 'generic',
+                'data-select2-url': reverse('control:organizer.gates.select2', kwargs={
+                    'organizer': self.event.organizer.slug,
+                }),
+                'data-placeholder': _('All gates'),
+            }
+        )
+        self.fields['gate'].widget.choices = self.fields['gate'].choices
+        self.fields['gate'].label = _('Gate')

src/pretix/control/forms/discounts.py

@@ -50,11 +50,16 @@ class DiscountForm(I18nModelForm):
             'condition_ignore_voucher_discounted',
             'benefit_discount_matching_percent',
             'benefit_only_apply_to_cheapest_n_matches',
+            'benefit_same_products',
+            'benefit_limit_products',
+            'benefit_apply_to_addons',
+            'benefit_ignore_voucher_discounted',
         ]
         field_classes = {
             'available_from': SplitDateTimeField,
             'available_until': SplitDateTimeField,
             'condition_limit_products': ItemMultipleChoiceField,
+            'benefit_limit_products': ItemMultipleChoiceField,
         }
         widgets = {
             'subevent_mode': forms.RadioSelect,
@@ -64,11 +69,14 @@ class DiscountForm(I18nModelForm):
                 'data-inverse-dependency': '<[name$=all_products]',
                 'class': 'scrolling-multiple-choice',
             }),
+            'benefit_limit_products': forms.CheckboxSelectMultiple(attrs={
+                'class': 'scrolling-multiple-choice',
+            }),
             'benefit_only_apply_to_cheapest_n_matches': forms.NumberInput(
                 attrs={
                     'data-display-dependency': '#id_condition_min_count',
                 }
-            )
+            ),
         }
 
     def __init__(self, *args, **kwargs):
@@ -85,6 +93,7 @@ class DiscountForm(I18nModelForm):
             widget=forms.CheckboxSelectMultiple,
         )
         self.fields['condition_limit_products'].queryset = self.event.items.all()
+        self.fields['benefit_limit_products'].queryset = self.event.items.all()
         self.fields['condition_min_count'].required = False
         self.fields['condition_min_count'].widget.is_required = False
         self.fields['condition_min_value'].required = False