Bump to 4.9.1

Currently translated at 89.6% (156 of 174 strings)

Translation: pretix/pretix (JavaScript parts)
Translate-URL: https://translate.pretix.eu/projects/pretix/pretix-js/uk/

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.github/workflows/tests.yml

@@ -18,17 +18,17 @@ jobs:
     name: Tests
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: ["3.7", "3.8", "3.9"]
         database: [sqlite, postgres, mysql]
         exclude:
           - database: mysql
-            python-version: 3.7
+            python-version: "3.8"
-          - database: sqlite
-            python-version: 3.7
           - database: mysql
-            python-version: 3.6
+            python-version: "3.9"
           - database: sqlite
-            python-version: 3.6
+            python-version: "3.7"
+          - database: sqlite
+            python-version: "3.8"
     steps:
       - uses: actions/checkout@v2
       - uses: getong/mariadb-action@v1.1
@@ -55,7 +55,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install system dependencies
-        run: sudo apt update && sudo apt install gettext mysql-client
+        run: sudo apt update && sudo apt install gettext mariadb-client-10.3
       - name: Install Python dependencies
         run: pip3 install -e ".[dev]" mysqlclient psycopg2-binary
         working-directory: ./src

doc/admin/config.rst

@@ -65,6 +65,9 @@ Example::
     A comma-separated list of plugins that are not available even though they are installed.
     Defaults to an empty string.
 
+``plugins_show_meta``
+    Whether to show authors and versions of plugins, defaults to ``on``.
+
 ``auth_backends``
     A comma-separated list of available auth backends. Defaults to ``pretix.base.auth.NativeAuthBackend``.
 
@@ -220,12 +223,30 @@ Example::
 ``user``, ``password``
     The SMTP user data to use for the connection. Empty by default.
 
+``tls``, ``ssl``
+    Use STARTTLS or SSL for the SMTP connection. Off by default.
+
 ``from``
     The email address to set as ``From`` header in outgoing emails by the system.
     Default: ``pretix@localhost``
 
-``tls``, ``ssl``
+``from_notifications``
-    Use STARTTLS or SSL for the SMTP connection. Off by default.
+    The email address to set as ``From`` header in admin notification emails by the system.
+    Defaults to the value of ``from``.
+
+``from_organizers``
+    The email address to set as ``From`` header in outgoing emails by the system sent on behalf of organizers.
+    Defaults to the value of ``from``.
+
+``custom_sender_verification_required``
+    If this is on (the default), organizers need to verify email addresses they want to use as senders in their event.
+
+``custom_sender_spf_string``
+    If this is set to a valid SPF string, pretix will show a warning if organizers use a sender address from a domain
+    that does not include this value.
+
+``custom_smtp_allow_private_networks``
+    If this is off (the default), custom SMTP servers cannot be private network addresses.
 
 ``admins``
     Comma-separated list of email addresses that should receive a report about every error code 500 thrown by pretix.
@@ -282,7 +303,7 @@ You can use an existing memcached server as pretix's caching backend::
 ``location``
     The location of memcached, either a host:port combination or a socket file.
 
-If no memcached is configured, pretix will use Django's built-in local-memory caching method.
+If no memcached is configured, pretix will use redis for caching. If neither is configured, pretix will not use any caching.
 
 .. note:: If you use memcached and you deploy pretix across multiple servers, you should use *one*
           shared memcached instance, not multiple ones, because cache invalidations would not be
@@ -445,8 +466,10 @@ You can configure the maximum file size for uploading various files::
     max_size_image = 12
     ; Max upload size for favicons in MiB, defaults to 1 MiB
     max_size_favicon = 2
-    ; Max upload size for email attachments in MiB, defaults to 10 MiB
+    ; Max upload size for email attachments of manually sent emails in MiB, defaults to 10 MiB
     max_size_email_attachment = 15
+    ; Max upload size for email attachments of automatically sent emails in MiB, defaults to 1 MiB
+    max_size_email_auto_attachment = 2
     ; Max upload size for other files in MiB, defaults to 10 MiB
     ; This includes all file upload type order questions
     max_size_other = 100

doc/admin/installation/docker_smallscale.rst

@@ -36,9 +36,6 @@ Linux and firewalls, we recommend that you start with `ufw`_.
           SSL certificates can be obtained for free these days. We also *do not* provide support for HTTP-only
           installations except for evaluation purposes.
 
-.. warning:: We recommend **PostgreSQL**. If you go for MySQL, make sure you run **MySQL 5.7 or newer** or
-             **MariaDB 10.2.7 or newer**.
-
 .. warning:: By default, using `ufw` in conjunction will not have any effect. Please make sure to either bind the exposed
              ports of your docker container explicitly to 127.0.0.1 or configure docker to respect any set up firewall
              rules.
@@ -61,6 +58,9 @@ directory writable to the user that runs pretix inside the docker container::
 Database
 --------
 
+.. warning:: **Please use PostgreSQL for all new installations**. If you need to go for MySQL, make sure you run
+             **MySQL 5.7 or newer** or **MariaDB 10.2.7 or newer**.
+
 Next, we need a database and a database user. We can create these with any kind of database managing tool or directly on
 our database's shell. Please make sure that UTF8 is used as encoding for the best compatibility. You can check this with
 the following command::
@@ -91,6 +91,8 @@ When using MySQL, make sure you set the character set of the database to ``utf8m
 
     mysql > CREATE DATABASE pretix DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_unicode_ci;
 
+You will also need to make sure that ``sql_mode`` in your ``my.cnf`` file does **not** include ``ONLY_FULL_GROUP_BY``.
+
 Redis
 -----
 
@@ -106,6 +108,18 @@ Now restart redis-server::
 
     # systemctl restart redis-server
 
+In this setup, systemd will delete ``/var/run/redis`` on every redis restart, which will cause issues with pretix. To
+prevent this, you can execute::
+
+   # systemctl edit redis-server
+
+And insert the following::
+
+    [Service]
+    # Keep the directory around so that pretix.service in docker does not need to be
+    # restarted when redis is restarted.
+    RuntimeDirectoryPreserve=yes
+
 .. warning:: Setting the socket permissions to 777 is a possible security problem. If you have untrusted users on your
              system or have high security requirements, please don't do this and let redis listen to a TCP socket
              instead. We recommend the socket approach because the TCP socket in combination with docker's networking

doc/admin/installation/manual_smallscale.rst

@@ -34,9 +34,6 @@ Linux and firewalls, we recommend that you start with `ufw`_.
           SSL certificates can be obtained for free these days. We also *do not* provide support for HTTP-only
           installations except for evaluation purposes.
 
-.. warning:: We recommend **PostgreSQL**. If you go for MySQL, make sure you run **MySQL 5.7 or newer** or
-             **MariaDB 10.2.7 or newer**.
-
 Unix user
 ---------
 
@@ -50,6 +47,9 @@ In this guide, all code lines prepended with a ``#`` symbol are commands that yo
 Database
 --------
 
+.. warning:: **Please use PostgreSQL for all new installations**. If you need to go for MySQL, make sure you run
+             **MySQL 5.7 or newer** or **MariaDB 10.2.7 or newer**.
+
 Having the database server installed, we still need a database and a database user. We can create these with any kind
 of database managing tool or directly on our database's shell. Please make sure that UTF8 is used as encoding for the
 best compatibility. You can check this with the following command::
@@ -65,6 +65,8 @@ When using MySQL, make sure you set the character set of the database to ``utf8m
 
     mysql > CREATE DATABASE pretix DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_unicode_ci;
 
+You will also need to make sure that ``sql_mode`` in your ``my.cnf`` file does **not** include ``ONLY_FULL_GROUP_BY``.
+
 Package dependencies
 --------------------
 
@@ -142,7 +144,7 @@ If you're running MySQL, also install the client library::
 
     (venv)$ pip3 install mysqlclient
 
-Note that you need Python 3.6 or newer. You can find out your Python version using ``python -V``.
+Note that you need Python 3.7 or newer. You can find out your Python version using ``python -V``.
 
 We also need to create a data directory::
 
@@ -259,14 +261,14 @@ The following snippet is an example on how to configure a nginx proxy for pretix
         }
 
         location /static/ {
-            alias /var/pretix/venv/lib/python3.7/site-packages/pretix/static.dist/;
+            alias /var/pretix/venv/lib/python3.10/site-packages/pretix/static.dist/;
             access_log off;
             expires 365d;
             add_header Cache-Control "public";
         }
     }
 
-.. note:: Remember to replace the ``python3.7`` in the ``/static/`` path in the config 
+.. note:: Remember to replace the ``python3.10`` 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/api/deviceauth.rst

@@ -99,7 +99,8 @@ following endpoint:
        "hardware_brand": "Samsung",
        "hardware_model": "Galaxy S",
        "software_brand": "pretixdroid",
-       "software_version": "4.1.0"
+       "software_version": "4.1.0",
+       "info": {"arbitrary": "data"}
    }
 
 You will receive a response equivalent to the response of your initialization request.

doc/api/fundamentals.rst

@@ -43,6 +43,8 @@ Possible permissions are:
 * Can view vouchers
 * Can change vouchers
 
+.. _`rest-compat`:
+
 Compatibility
 -------------
 
@@ -58,6 +60,7 @@ that your clients can deal with them properly:
 * Support of new HTTP methods for a given API endpoint
 * Support of new query parameters for a given API endpoint
 * New fields contained in API responses
+* Response body structure or message texts on failed requests (``4xx``, ``5xx`` response codes)
 
 We treat the following types of changes as *backwards-incompatible*:
 

doc/api/guides/custom_checkout.rst

@@ -97,7 +97,8 @@ For example, if you want users to be redirected to ``https://example.org/order/r
 either enter ``https://example.org`` or ``https://example.org/order/``.
 
 The user will be redirected back to your page instead of pretix' order confirmation page after the payment,
-**regardless of whether it was successful or not**. Make sure you use our API to check if the payment actually
+**regardless of whether it was successful or not**. We will append an ``error=…`` query parameter with an error
+message, but you should not rely on that and instead make sure you use our API to check if the payment actually
 worked! Your final URL could look like this::
 
     https://test.pretix.eu/democon/3vjrh/order/NSLEZ/ujbrnsjzbq4dzhck/pay/123/?return_url=https%3A%2F%2Fexample.org%2Forder%2Freturn%3Ftx_id%3D1234

doc/api/resources/checkinlists.rst

@@ -611,8 +611,12 @@ Order position endpoints
    Tries to redeem an order position, identified by its internal ID, i.e. checks the attendee in. This endpoint
    accepts a number of optional requests in the body.
 
-   **Tip:** Instead of an ID, you can also use the ``secret`` field as the lookup parameter.
+   **Tip:** Instead of an ID, you can also use the ``secret`` field as the lookup parameter. In this case, you should
+   always set ``untrusted_input=true`` as a query parameter to avoid security issues.
 
+   :query boolean untrusted_input: If set to true, the lookup parameter is **always** interpreted as a ``secret``, never
+                                   as an ``id``. This should be always set if you are passing through untrusted, scanned
+                                   data to avoid guessing of ticket IDs.
    :<json boolean questions_supported: When this parameter is set to ``true``, handling of questions is supported. If
                                        you do not implement question handling in your user interface, you **must**
                                        set this to ``false``. In that case, questions will just be ignored. Defaults

doc/api/resources/index.rst

@@ -1,6 +1,11 @@
 Resources and endpoints
 =======================
 
+With a few exceptions, this only lists resources bundled in the pretix core modules.
+Additional endpoints are provided by pretix plugins. Some of them are documented
+at :ref:`plugin-docs`.
+
+
 .. toctree::
    :maxdepth: 2
 
@@ -33,4 +38,4 @@ Resources and endpoints
    exporters
    sendmail_rules
    billing_invoices
-   billing_var
+   billing_var

doc/api/resources/invoices.rst

@@ -58,6 +58,12 @@ lines                                 list of objects            The actual invo
                                                                  created before this field was introduced as well as for
                                                                  all lines not created by a product (e.g. a shipping or
                                                                  cancellation fee).
+├ subevent                            integer                    Event series date ID used to create this line. Note that everything
+                                                                 about the subevent might have changed since the creation
+                                                                 of the invoice. Can be ``null`` for all invoice lines
+                                                                 created before this field was introduced as well as for
+                                                                 all lines not created by a product (e.g. a shipping or
+                                                                 cancellation fee) as well as for all events that are not a series.
 ├ fee_type                            string                     Fee type, e.g. ``shipping``, ``service``, ``payment``,
                                                                  ``cancellation``, ``giftcard``, or ``other. Can be ``null`` for
                                                                  all invoice lines
@@ -120,6 +126,10 @@ internal_reference                    string                     Customer's refe
 
    The attribute ``lines.event_location`` has been added.
 
+.. versionchanged:: 4.6
+
+   The attribute ``lines.subevent`` has been added.
+
 
 Endpoints
 ---------
@@ -185,6 +195,7 @@ Endpoints
                 "description": "Budget Ticket",
                 "item": 1234,
                 "variation": 245,
+                "subevent": null,
                 "fee_type": null,
                 "fee_internal_type": null,
                 "event_date_from": "2017-12-27T10:00:00Z",
@@ -274,6 +285,7 @@ Endpoints
             "description": "Budget Ticket",
             "item": 1234,
             "variation": 245,
+            "subevent": null,
             "fee_type": null,
             "fee_internal_type": null,
             "event_date_from": "2017-12-27T10:00:00Z",

doc/api/resources/item_variations.rst

@@ -24,6 +24,9 @@ active                                boolean                    If ``false``, t
 description                           multi-lingual string       A public description of the variation. May contain
                                                                  Markdown syntax or can be ``null``.
 position                              integer                    An integer, used for sorting
+require_approval                      boolean                    If ``true``, orders with this variation will need to be
+                                                                 approved by the event organizer before they can be
+                                                                 paid.
 require_membership                    boolean                    If ``true``, booking this variation requires an active membership.
 require_membership_hidden             boolean                    If ``true`` and ``require_membership`` is set, this variation will
                                                                  be hidden from users without a valid membership.
@@ -76,6 +79,7 @@ Endpoints
               "en": "S"
             },
             "active": true,
+            "require_approval": false,
             "require_membership": false,
             "require_membership_hidden": false,
             "require_membership_types": [],
@@ -97,6 +101,7 @@ Endpoints
               "en": "L"
             },
             "active": true,
+            "require_approval": false,
             "require_membership": false,
             "require_membership_hidden": false,
             "require_membership_types": [],
@@ -147,6 +152,7 @@ Endpoints
         "price": "10.00",
         "original_price": null,
         "active": true,
+        "require_approval": false,
         "require_membership": false,
         "require_membership_hidden": false,
         "require_membership_types": [],
@@ -183,6 +189,7 @@ Endpoints
         "value": {"en": "Student"},
         "default_price": "10.00",
         "active": true,
+        "require_approval": false,
         "require_membership": false,
         "require_membership_hidden": false,
         "require_membership_types": [],
@@ -209,6 +216,7 @@ Endpoints
         "price": "10.00",
         "original_price": null,
         "active": true,
+        "require_approval": false,
         "require_membership": false,
         "require_membership_hidden": false,
         "require_membership_types": [],
@@ -266,6 +274,7 @@ Endpoints
         "price": "10.00",
         "original_price": null,
         "active": false,
+        "require_approval": false,
         "require_membership": false,
         "require_membership_hidden": false,
         "require_membership_types": [],

doc/api/resources/orders.rst

@@ -68,6 +68,7 @@ positions                             list of objects            List of order p
                                                                  non-canceled positions are included.
 fees                                  list of objects            List of fees included in the order total. By default, only
                                                                  non-canceled fees are included.
+├ id                                  integer                    Internal ID of the fee record
 ├ fee_type                            string                     Type of fee (currently ``payment``, ``passbook``,
                                                                  ``other``)
 ├ value                               money (string)             Fee amount
@@ -132,6 +133,14 @@ last_modified                         datetime                   Last modificati
 
    The ``item`` and ``variation`` query parameters have been added.
 
+.. versionchanged:: 4.6
+
+   The ``subevent`` query parameters has been added.
+
+.. versionchanged:: 4.8
+
+   The ``order.fees.id`` attribute has been added.
+
 
 .. _order-position-resource:
 
@@ -433,6 +442,7 @@ List of all orders
        recommend using this in combination with ``testmode=false``, since test mode orders can vanish at any time and
        you will not notice it using this method.
    :query datetime created_since: Only return orders that have been created since the given date.
+   :query integer subevent: Only return orders with a position that contains this subevent ID. *Warning:* Result will also include orders if they contain mixed subevents, and it will even return orders where the subevent is only contained in a canceled position.
    :query datetime subevent_after: Only return orders that contain a ticket for a subevent taking place after the given date. This is an exclusive after, and it considers the **end** of the subevent (or its start, if the end is not set).
    :query datetime subevent_before: Only return orders that contain a ticket for a subevent taking place after the given date. This is an exclusive before, and it considers the **start** of the subevent.
    :query string exclude: Exclude a field from the output, e.g. ``fees`` or ``positions.downloads``. Can be used as a performance optimization. Can be passed multiple times.
@@ -730,6 +740,37 @@ Generating new secrets
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
 
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/regenerate_secrets/
+
+   Triggers generation of a new ``secret`` attribute for a single order position.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orderpositions/23/regenerate_secrets/ 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
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+   :param code: The ``id`` field of the order position to update
+
+   :statuscode 200: no error
+   :statuscode 400: The order position could not be updated due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order position.
+
 Deleting orders
 ---------------
 
@@ -834,6 +875,7 @@ Creating orders
    * ``comment`` (optional)
    * ``custom_followup_at`` (optional)
    * ``checkin_attention`` (optional)
+   * ``require_approval`` (optional)
    * ``invoice_address`` (optional)
 
       * ``company``
@@ -893,8 +935,9 @@ Creating orders
 
    * ``force`` (optional). If set to ``true``, quotas will be ignored.
    * ``send_email`` (optional). If set to ``true``, the same emails will be sent as for a regular order, regardless of
-     whether these emails are enabled for certain sales channels. Defaults to
+     whether these emails are enabled for certain sales channels. If set to ``null``, behavior will be controlled by pretix'
-     ``false``. Used to be ``send_mail`` before pretix 3.14.
+     settings based on the sales channels (added in pretix 4.7). Defaults to ``false``.
+     Used to be ``send_mail`` before pretix 3.14.
 
    If you want to use add-on products, you need to set the ``positionid`` fields of all positions manually
    to incrementing integers starting with ``1``. Then, you can reference one of these
@@ -1039,6 +1082,9 @@ Order state operations
    will instead stay paid, but all positions will be removed (or marked as canceled) and replaced by the cancellation
    fee as the only component of the order.
 
+   You can control whether the customer is notified through ``send_email`` (defaults to ``true``).
+   You can pass a ``comment`` that can be visible to the user if it is used in the email template.
+
    **Example request**:
 
    .. sourcecode:: http
@@ -1050,6 +1096,7 @@ Order state operations
 
       {
           "send_email": true,
+          "comment": "Event was canceled.",
           "cancellation_fee": null
       }
 
@@ -1635,6 +1682,8 @@ Order position ticket download
    :statuscode 409: The file is not yet ready and will now be prepared. Retry the request after waiting for a few
                     seconds.
 
+.. _rest-orderpositions-manipulate:
+
 Manipulating individual positions
 ---------------------------------
 
@@ -1642,6 +1691,11 @@ Manipulating individual positions
 
    The ``PATCH`` method has been added for individual positions.
 
+.. versionchanged:: 4.8
+
+   The ``PATCH`` method now supports changing items, variations, subevents, seats, prices, and tax rules.
+   The ``POST`` endpoint to add individual positions has been added.
+
 .. http:patch:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
 
    Updates specific fields on an order position. Currently, only the following fields are supported:
@@ -1668,6 +1722,21 @@ Manipulating individual positions
      and ``option_identifiers`` will be ignored. As a special case, you can submit the magic value
      ``"file:keep"`` as the answer to a file question to keep the current value without re-uploading it.
 
+   * ``item``
+
+   * ``variation``
+
+   * ``subevent``
+
+   * ``seat`` (specified as a string mapping to a ``string_guid``)
+
+   * ``price``
+
+   * ``tax_rule``
+
+   Changing parameters such as ``item`` or ``price`` will **not** automatically trigger creation of a new invoice,
+   you need to take care of that yourself.
+
    **Example request**:
 
    .. sourcecode:: http
@@ -1689,7 +1758,7 @@ Manipulating individual positions
       Vary: Accept
       Content-Type: application/json
 
-      (Full order resource, see above.)
+      (Full order position resource, see above.)
 
    :param organizer: The ``slug`` field of the organizer of the event
    :param event: The ``slug`` field of the event
@@ -1700,9 +1769,83 @@ Manipulating individual positions
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
 
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/
+
+   Adds a new position to an order. Currently, only the following fields are supported:
+
+   * ``order`` (mandatory, specified as a string mapping to a ``code``)
+
+   * ``addon_to`` (optional, specified as an integer mapping to the ``positionid`` of the parent position)
+
+   * ``item`` (mandatory)
+
+   * ``variation`` (mandatory depending on item)
+
+   * ``subevent`` (mandatory depending on event)
+
+   * ``seat`` (specified as a string mapping to a ``string_guid``, mandatory depending on event and item)
+
+   * ``price`` (default price will be used if unset)
+
+   * ``attendee_email``
+
+   * ``attendee_name_parts`` or ``attendee_name``
+
+   * ``company``
+
+   * ``street``
+
+   * ``zipcode``
+
+   * ``city``
+
+   * ``country``
+
+   * ``state``
+
+   * ``answers``: Validation is handled the same way as when creating orders through the API. You are therefore
+     expected to provide ``question``, ``answer``, and possibly ``options``. ``question_identifier``
+     and ``option_identifiers`` will be ignored. As a special case, you can submit the magic value
+     ``"file:keep"`` as the answer to a file question to keep the current value without re-uploading it.
+
+   This will **not** automatically trigger creation of a new invoice, you need to take care of that yourself.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orderpositions/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "order": "ABC12",
+        "item": 5,
+        "addon_to": 1
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+
+   :statuscode 200: no error
+   :statuscode 400: The position could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create this position.
+
 .. http:delete:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
 
-   Deletes an order position, identified by its internal ID.
+   Cancels an order position, identified by its internal ID.
 
    **Example request**:
 
@@ -1728,6 +1871,128 @@ Manipulating individual positions
    :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
    :statuscode 404: The requested order position does not exist.
 
+Changing order contents
+-----------------------
+
+While you can :ref:`change positions individually <rest-orderpositions-manipulate>` sometimes it is necessary to make
+multiple changes to an order at once within one transaction. This makes it possible to e.g. swap the seats of two
+attendees in an order without running into conflicts. This interface also offers some possibilities not available
+otherwise, such as splitting an order or changing fees.
+
+.. versionchanged:: 4.8
+
+   This endpoint has been added to the system.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/change/
+
+   Performs a change operation on an order. You can supply the following fields:
+
+   * ``patch_positions``: A list of objects with the two keys ``position`` specifying an order position ID and
+     ``body`` specifying the desired changed values of the position (``item``, ``variation``, ``subevent``, ``seat``,
+     ``price``, ``tax_rule``).
+
+   * ``cancel_positions``: A list of objects with the single key ``position`` specifying an order position ID.
+
+   * ``split_positions``: A list of objects with the single key ``position`` specifying an order position ID.
+
+   * ``create_positions``: A list of objects describing new order positions with the same fields supported as when
+     creating them individually through the ``POST …/orderpositions/`` endpoint.
+
+   * ``patch_fees``: A list of objects with the two keys ``fee`` specifying an order fee ID and
+     ``body`` specifying the desired changed values of the position (``value``).
+
+   * ``cancel_fees``: A list of objects with the single key ``fee`` specifying an order fee ID.
+
+   * ``recalculate_taxes``: If set to ``"keep_net"``, all taxes will be recalculated based on the tax rule and invoice
+     address, the net price will be kept. If set to ``"keep_gross"``, the gross price will be kept. If set to ``null``
+     (the default) the taxes are not recalculated.
+
+   * ``send_email``: If set to ``true``, the customer will be notified about the change. Defaults to ``false``.
+
+   * ``reissue_invoice``: If set to ``true`` and an invoice exists for the order, it will be canceled and a new invoice
+     will be issued. Defaults to ``true``.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/orders/ABC12/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "cancel_positions": [
+          {
+            "position": 12373
+          }
+        ],
+        "patch_positions": [
+          {
+            "position": 12374,
+            "body": {
+              "item": 12,
+              "variation": None,
+              "subevent": 562,
+              "seat": "seat-guid-2",
+              "price": "99.99",
+              "tax_rule": 15
+            }
+          }
+        ],
+        "split_positions": [
+          {
+            "position": 12375
+          }
+        ],
+        "create_positions": [
+          {
+            "item": 12,
+            "variation": None,
+            "subevent": 562,
+            "seat": "seat-guid-2",
+            "price": "99.99",
+            "addon_to": 12374,
+            "attendee_name": "Peter",
+          }
+        ],
+        "cancel_fees": [
+          {
+            "fee": 49
+          }
+        ],
+        "change_fees": [
+          {
+            "fee": 51,
+            "body": {
+              "value": "12.00"
+            }
+          }
+        ],
+        "reissue_invoice": true,
+        "send_email": true,
+        "recalculate_taxes": "keep_gross"
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order position resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+   :param code: The ``code`` field of the order to update
+
+   :statuscode 200: no error
+   :statuscode 400: The order could not be updated due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to update this order.
+
 
 Order payment endpoints
 -----------------------

doc/api/resources/taxrules.rst

@@ -16,15 +16,22 @@ Field                                 Type                       Description
 ===================================== ========================== =======================================================
 id                                    integer                    Internal ID of the tax rule
 name                                  multi-lingual string       The tax rules' name
+internal_name                         string                     An optional name that is only used in the backend
 rate                                  decimal (string)           Tax rate in percent
 price_includes_tax                    boolean                    If ``true`` (default), tax is assumed to be included in
                                                                  the specified product price
 eu_reverse_charge                     boolean                    If ``true``, EU reverse charge rules are applied
 home_country                          string                     Merchant country (required for reverse charge), can be
                                                                  ``null`` or empty string
+keep_gross_if_rate_changes            boolean                    If ``true``, changes of the tax rate based on custom
+                                                                 rules keep the gross price constant (default is ``false``)
 ===================================== ========================== =======================================================
 
 
+.. versionchanged:: 4.6
+
+    The ``internal_name`` and ``keep_gross_if_rate_changes`` attributes have been added.
+
 Endpoints
 ---------
 
@@ -56,9 +63,11 @@ Endpoints
           {
             "id": 1,
             "name": {"en": "VAT"},
+            "internal_name": "VAT",
             "rate": "19.00",
             "price_includes_tax": true,
             "eu_reverse_charge": false,
+            "keep_gross_if_rate_changes": false,
             "home_country": "DE"
           }
         ]
@@ -94,9 +103,11 @@ Endpoints
       {
         "id": 1,
         "name": {"en": "VAT"},
+        "internal_name": "VAT",
         "rate": "19.00",
         "price_includes_tax": true,
         "eu_reverse_charge": false,
+        "keep_gross_if_rate_changes": false,
         "home_country": "DE"
       }
 
@@ -140,9 +151,11 @@ Endpoints
       {
         "id": 1,
         "name": {"en": "VAT"},
+        "internal_name": "VAT",
         "rate": "19.00",
         "price_includes_tax": true,
         "eu_reverse_charge": false,
+        "keep_gross_if_rate_changes": false,
         "home_country": "DE"
       }
 
@@ -185,9 +198,11 @@ Endpoints
       {
         "id": 1,
         "name": {"en": "VAT"},
+        "internal_name": "VAT",
         "rate": "20.00",
         "price_includes_tax": true,
         "eu_reverse_charge": false,
+        "keep_gross_if_rate_changes": false,
         "home_country": "DE"
       }
 

doc/development/algorithms/index.rst

@@ -2,7 +2,7 @@ Algorithms
 ==========
 
 The business logic inside pretix is full of complex algorithms making decisions based on all the hundreds of settings
-and input parameters available. Some of them are documented here as graphs, either because fully understanding them is very
+and input parameters available. Some of them are documented here as graphs, either because fully understanding them is very important
 when working on features close to them, or because they also need to be re-implemented by client-side components like our
 ticket scanning apps and we want to ensure the implementations are as similar as possible to avoid confusion.
 

doc/development/api/auth.rst

@@ -20,20 +20,31 @@ Basically, three pre-defined flows are supported:
 * Authentication mechanisms that rely on **redirection**, e.g. to an OAuth provider. These can be implemented by
   supplying a ``authentication_url`` method and implementing a custom return view.
 
-Authentication backends are *not* collected through a signal. Instead, they must explicitly be set through the
+For security reasons, authentication backends are *not* automatically discovered through a signal. Instead, they must
-``auth_backends`` directive in the ``pretix.cfg`` :ref:`configuration file <config>`.
+explicitly be set through the ``auth_backends`` directive in the ``pretix.cfg`` :ref:`configuration file <config>`.
 
-In each of these methods (``form_authenticate``, ``request_authenticate`` or your custom view) you are supposed to
+In each of these methods (``form_authenticate``, ``request_authenticate``, or your custom view) you are supposed to
-either get an existing :py:class:`pretix.base.models.User` object from the database or create a new one. There are a
+use ``User.objects.get_or_create_for_backend`` to get a :py:class:`pretix.base.models.User` object from the database
-few rules you need to follow:
+or create a new one.
 
-* You **MUST** only return users with the ``auth_backend`` attribute set to the ``identifier`` value of your backend.
+There are a few rules you need to follow:
 
-* You **MUST** create new users with the ``auth_backend`` attribute set to the ``identifier`` value of your backend.
+* You **MUST** have some kind of identifier for a user that is globally unique and **SHOULD** never change, even if the
+  user's name or email address changes. This could e.g. be the ID of the user in an external database. The identifier
+  must not be longer than 190 characters. If you worry your backend might generated longer identifiers, consider
+  using a hash function to trim them to a constant length.
+
+* You **SHOULD** not allow users created by other authentication backends to log in through your code, and you **MUST**
+  only create, modify or return users with ``auth_backend`` set to your backend.
 
 * Every user object **MUST** have an email address. Email addresses are globally unique. If the email address is
   already registered to a user who signs in through a different backend, you **SHOULD** refuse the login.
 
+``User.objects.get_or_create_for_backend`` will follow these rules for you automatically. It works like this:
+
+.. autoclass:: pretix.base.models.auth.UserManager
+   :members: get_or_create_for_backend
+
 The backend interface
 ---------------------
 
@@ -59,6 +70,7 @@ The backend interface
 
    .. automethod:: authentication_url
 
+
 Logging users in
 ----------------
 
@@ -68,3 +80,45 @@ recommend that you use the following utility method to correctly set session val
 authentication (if activated):
 
 .. autofunction:: pretix.control.views.auth.process_login
+
+A custom view that is called after a redirect from an external identity provider could look like this::
+
+   from django.contrib import messages
+   from django.shortcuts import redirect
+   from django.urls import reverse
+
+   from pretix.base.models import User
+   from pretix.base.models.auth import EmailAddressTakenError
+   from pretix.control.views.auth import process_login
+
+
+   def return_view(request):
+       # Verify validity of login with the external provider's API
+       api_response = my_verify_login_function(
+           code=request.GET.get('code')
+       )
+
+       try:
+           u = User.objects.get_or_create_for_backend(
+               'my_backend_name',
+               api_response['userid'],
+               api_response['email'],
+               set_always={
+                   'fullname': '{} {}'.format(
+                       api_response.get('given_name', ''),
+                       api_response.get('family_name', ''),
+                   ),
+               },
+               set_on_creation={
+                   'locale': api_response.get('locale').lower()[:2],
+                   'timezone': api_response.get('zoneinfo', 'UTC'),
+               }
+           )
+       except EmailAddressTakenError:
+           messages.error(
+               request, _('We cannot create your user account as a user account in this system '
+                          'already exists with the same email address.')
+           )
+           return redirect(reverse('control:auth.login'))
+       else:
+           return process_login(request, u, keep_logged_in=False)

doc/development/api/cookieconsent.rst

@@ -0,0 +1,119 @@
+.. highlight:: python
+   :linenothreshold: 5
+
+.. _`cookieconsent`:
+
+Handling cookie consent
+=======================
+
+pretix includes an optional feature to handle cookie consent explicitly to comply with EU regulations.
+If your plugin sets non-essential cookies or includes a third-party service that does so, you should
+integrate with this feature.
+
+Server-side integration
+-----------------------
+
+First, you need to declare that you are using non-essential cookies by responding to the following
+signal:
+
+.. automodule:: pretix.presale.signals
+   :members: register_cookie_providers
+
+You are expected to return a list of ``CookieProvider`` objects instantiated from the following class:
+
+.. class:: pretix.presale.cookies.CookieProvider
+
+   .. py:attribute:: CookieProvider.identifier
+
+      A short and unique identifier used to distinguish this cookie provider form others (required).
+
+   .. py:attribute:: CookieProvider.provider_name
+
+      A human-readable name of the entity of feature responsible for setting the cookie (required).
+
+   .. py:attribute:: CookieProvider.usage_classes
+
+      A list of enum values from the ``pretix.presale.cookies.UsageClass`` enumeration class, such as
+      ``UsageClass.ANALYTICS``, ``UsageClass.MARKETING``, or ``UsageClass.SOCIAL`` (required).
+
+   .. py:attribute:: CookieProvider.privacy_url
+
+      A link to a privacy policy (optional).
+
+Here is an example of such a receiver:
+
+.. code-block:: python
+
+   @receiver(register_cookie_providers)
+   def recv_cookie_providers(sender, request, **kwargs):
+       return [
+           CookieProvider(
+               identifier='google_analytics',
+               provider_name='Google Analytics',
+               usage_classes=[UsageClass.ANALYTICS],
+           )
+       ]
+
+JavaScript-side integration
+---------------------------
+
+The server-side integration only causes the cookie provider to show up in the cookie dialog. You still
+need to care about actually enforcing the consent state.
+
+You can access the consent state through the ``window.pretix.cookie_consent`` variable. Whenever the
+value changes, a ``pretix:cookie-consent:change`` event is fired on the ``document`` object.
+
+The variable will generally have one of the following states:
+
+.. rst-class:: rest-resource-table
+
+================================================================ =====================================================
+State                                                            Interpretation
+================================================================ =====================================================
+``pretix === undefined || pretix.cookie_consent === undefined``  Your JavaScript has loaded before the cookie consent
+                                                                 script. Wait for the event to be fired, then try again,
+                                                                 do not yet set a cookie.
+``pretix.cookie_consent === null``                               The cookie consent mechanism has not been enabled. This
+                                                                 usually means that you can set cookies however you like.
+``pretix.cookie_consent[identifier] === undefined``              The cookie consent mechanism is loaded, but has no data
+                                                                 on your cookie yet, wait for the event to be fired, do not
+                                                                 yet set a cookie.
+``pretix.cookie_consent[identifier] === true``                   The user has consented to your cookie.
+``pretix.cookie_consent[identifier] === false``                  The user has actively rejected your cookie.
+================================================================ =====================================================
+
+If you are integrating e.g. a tracking provider with native cookie consent support such
+as Facebook's Pixel, you can integrate it like this:
+
+.. code-block:: javascript
+
+     var consent = (window.pretix || {}).cookie_consent;
+     if (consent !== null && !(consent || {}).facebook) {
+         fbq('consent', 'revoke');
+     }
+     fbq('init', ...);
+     document.addEventListener('pretix:cookie-consent:change', function (e) {
+         fbq('consent', (e.detail || {}).facebook ? 'grant' : 'revoke');
+     })
+
+If you have a JavaScript function that you only want to load if consent for a specific ``identifier``
+is given, you can wrap it like this:
+
+.. code-block:: javascript
+
+     var consent_identifier = "youridentifier";
+     var consent = (window.pretix || {}).cookie_consent;
+     if (consent === null || (consent || {})[consent_identifier] === true) {
+         // Cookie consent tool is either disabled or consent is given
+         addScriptElement(src);
+         return;
+     }
+
+     // Either cookie consent tool has not loaded yet or consent is not given
+     document.addEventListener('pretix:cookie-consent:change', function onChange(e) {
+         var consent = e.detail || {};
+         if (consent === null || consent[consent_identifier] === true) {
+             addScriptElement(src);
+             document.removeEventListener('pretix:cookie-consent:change', onChange);
+         }
+     })

doc/development/api/index.rst

@@ -17,6 +17,7 @@ Contents:
    shredder
    import
    customview
+   cookieconsent
    auth
    general
    quality

doc/development/api/payment.rst

@@ -62,6 +62,8 @@ The provider class
 
    .. autoattribute:: public_name
 
+   .. autoattribute:: confirm_button_name
+
    .. autoattribute:: is_enabled
 
    .. autoattribute:: priority

doc/development/api/plugins.rst

@@ -45,13 +45,17 @@ Attribute          Type                 Description
 name               string               The human-readable name of your plugin
 author             string               Your name
 version            string               A human-readable version code of your plugin
-description        string               A more verbose description of what your plugin does.
+description        string               A more verbose description of what your plugin does. May contain HTML.
 category           string               Category of a plugin. Either one of ``"FEATURE"``, ``"PAYMENT"``,
                                         ``"INTEGRATION"``, ``"CUSTOMIZATION"``, ``"FORMAT"``, or ``"API"``,
                                         or any other string.
+picture            string (optional)    Path to a picture resolvable through the static file system.
+featured           boolean (optional)   ``False`` by default, can promote a plugin if it's something many users will want, use carefully.
 visible            boolean (optional)   ``True`` by default, can hide a plugin so it cannot be normally activated.
 restricted         boolean (optional)   ``False`` by default, restricts a plugin such that it can only be enabled
                                         for an event by system administrators / superusers.
+experimental       boolean (optional)   ``False`` by default, marks a plugin as an experimental feature in the plugins list.
+picture            string (optional)    Path to a picture resolvable through the static file system.
 compatibility      string               Specifier for compatible pretix versions.
 ================== ==================== ===========================================================
 
@@ -74,8 +78,10 @@ A working example would be:
             name = _("PayPal")
             author = _("the pretix team")
             version = '1.0.0'
-            category = 'PAYMENT
+            category = 'PAYMENT'
+            picture = 'pretix_paypal/paypal_logo.svg'
             visible = True
+            featured = False
             restricted = False
             description = _("This plugin allows you to receive payments via PayPal")
             compatibility = "pretix>=2.7.0"
@@ -92,6 +98,7 @@ those will be displayed but not block the plugin execution.
 
 The ``AppConfig`` class may implement a method ``is_available(event)`` that checks if a plugin
 is available for a specific event. If not, it will not be shown in the plugin list of that event.
+You should not define ``is_available`` and ``restricted`` on the same plugin.
 
 Plugin registration
 -------------------

doc/plugins/digital.rst

@@ -61,7 +61,7 @@ Variable                            Description
 ``attendee_city``                   City of the ticket holder's address (or empty)
 ``attendee_country``                Country code of the ticket holder's address (or empty)
 ``attendee_state``                  State of the ticket holder's address (or empty)
-``answer[XYZ]``                     Answer to the custom question with identifier ``XYZ``
+``answers[XYZ]``                    Answer to the custom question with identifier ``XYZ``
 ``invoice_name``                    Full name of the invoice address (or empty)
 ``invoice_name_*``                  Name parts of the invoice address, depending on configuration, e.g. ``invoice_name_given_name`` or ``invoice_name_family_name``
 ``invoice_company``                 Company of the invoice address (or empty)

doc/plugins/exhibitors.rst

@@ -0,0 +1,630 @@
+Exhibitors
+==========
+
+The exhibitors plugin allows to manage exhibitors at your trade show or conference. After signing up your exhibitors
+in the system, you can assign vouchers to exhibitors and give them access to the data of these vouchers. The exhibitors
+module is also the basis of the pretixLEAD lead scanning application.
+
+.. note:: On pretix Hosted, using the lead scanning feature of the exhibitors plugin can add additional costs
+          depending on your contract.
+
+The plugin exposes two APIs. One (REST API) is intended for bulk-data operations from the admin side, and one
+(App API) that is used by the pretixLEAD app.
+
+REST API
+---------
+
+The REST API for exhibitors requires the usual :ref:`rest-auth`.
+
+Resources
+"""""""""
+
+The exhibitors plugin provides a HTTP API that allows you to create new exhibitors.
+
+The exhibitors resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+id                                    integer                    Internal exhibitor ID in pretix
+name                                  string                     Exhibitor name
+internal_id                           string                     Can be used for the ID in your exhibition system, your customer ID, etc. Can be ``null``. Maximum 255 characters.
+contact_name                          string                     Contact person (or ``null``)
+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``).
+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
+allow_voucher_access                  boolean                    Enables access to data gathered by exhibitor vouchers
+comment                               string                     Internal comment, not shown to exhibitor
+===================================== ========================== =======================================================
+
+You can also access the scanned leads through the API which contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+attendee_order                        string                     Order code of the order the scanned attendee belongs to
+attendee_positionid                   integer                    ``positionid`` if the attendee within the order specified by ``attendee_order``
+rating                                integer                    A rating of 0 to 5 stars (or ``null``)
+notes                                 string                     A note taken by the exhibitor after scanning
+tags                                  list of strings            Additional tags selected by the exhibitor
+first_upload                          datetime                   Date and time of the first upload of this lead
+data                                  list of objects            Attendee data set that may be shown to the exhibitor based o
+                                                                 the event's configuration. Each entry contains the fields ``id``,
+                                                                 ``label``, ``value``, and ``details``. ``details`` is usually empty
+                                                                 except in a few cases where it contains an additional list of objects
+                                                                 with ``value`` and ``label`` keys (e.g. splitting of names).
+device_name                           string                     User-defined name for the device used for scanning (or ``null``).
+===================================== ========================== =======================================================
+
+Endpoints
+"""""""""
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/
+
+   Returns a list of all exhibitors configured for an event.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/exhibitors/ 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": [
+          {
+            "id": 1,
+            "name": "Aperture Science",
+            "internal_id": null,
+            "contact_name": "Dr Cave Johnson",
+            "contact_name_parts": {
+                "_scheme": "salutation_title_given_family",
+                "family_name": "Johnson",
+                "given_name": "Cave",
+                "salutation": "",
+                "title": "Dr"
+            },
+            "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,
+            "comment": ""
+          }
+        ]
+      }
+
+   :query page: The page number in case of a multi-page result set, default is 1
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of the event to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer or event does not exist **or** you have no permission to view it.
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/
+
+   Returns information on one exhibitor, identified by its ID.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/ 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
+
+      {
+        "id": 1,
+        "name": "Aperture Science",
+        "internal_id": null,
+        "contact_name": "Dr Cave Johnson",
+        "contact_name_parts": {
+            "_scheme": "salutation_title_given_family",
+            "family_name": "Johnson",
+            "given_name": "Cave",
+            "salutation": "",
+            "title": "Dr"
+        },
+        "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,
+        "comment": ""
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param event: The ``slug`` field of the event to fetch
+   :param id: The ``id`` field of the exhibitor to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/exhibitor does not exist **or** you have no permission to view it.
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/leads/
+
+   Returns a list of all scanned leads of an exhibitor.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/leads/ 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": [
+          {
+            "attendee_order": "T0E7E",
+            "attendee_positionid": 1,
+            "rating": 1,
+            "notes": "",
+            "tags": [],
+            "first_upload": "2021-07-06T11:03:31.414491+01:00",
+            "data": [
+              {
+                "id": "attendee_name",
+                "label": "Attendee name",
+                "value": "Peter Miller",
+                "details": [
+                  {"label": "Given name", "value": "Peter"},
+                  {"label": "Family name", "value": "Miller"},
+                ]
+              }
+            ]
+          }
+        ]
+      }
+
+   :query page: The page number in case of a multi-page result set, default is 1
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of the event to fetch
+   :param id: The ``id`` field of the exhibitor to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer or event or exhibitor does not exist **or** you have no permission to view it.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/
+
+   Create a new exhibitor.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/exhibitors/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 166
+
+      {
+        "name": "Aperture Science",
+        "internal_id": null,
+        "contact_name_parts": {
+            "_scheme": "salutation_title_given_family",
+            "family_name": "Johnson",
+            "given_name": "Cave",
+            "salutation": "",
+            "title": "Dr"
+        },
+        "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,
+        "comment": ""
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "name": "Aperture Science",
+        "internal_id": null,
+        "contact_name": "Dr Cave Johnson",
+        "contact_name_parts": {
+            "_scheme": "salutation_title_given_family",
+            "family_name": "Johnson",
+            "given_name": "Cave",
+            "salutation": "",
+            "title": "Dr"
+        },
+        "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,
+        "comment": ""
+      }
+
+   :param organizer: The ``slug`` field of the organizer to create new exhibitor for
+   :param event: The ``slug`` field of the event to create new exhibitor for
+   :statuscode 201: no error
+   :statuscode 400: The exhibitor could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create exhibitors.
+
+
+.. http:patch:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/
+
+   Update an exhibitor. You can also use ``PUT`` instead of ``PATCH``. With ``PUT``, you have to provide all fields of
+   the resource, other fields will be reset to default. With ``PATCH``, you only need to provide the fields that you
+   want to change.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/digitalcontents/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 34
+
+      {
+        "internal_id": "ABC"
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: text/javascript
+
+      {
+        "id": 1,
+        "name": "Aperture Science",
+        "internal_id": "ABC",
+        "contact_name": "Dr Cave Johnson",
+        "contact_name_parts": {
+            "_scheme": "salutation_title_given_family",
+            "family_name": "Johnson",
+            "given_name": "Cave",
+            "salutation": "",
+            "title": "Dr"
+        },
+        "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,
+        "comment": ""
+      }
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the exhibitor to modify
+   :statuscode 200: no error
+   :statuscode 400: The exhibitor could not be modified due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/exhibitor does not exist **or** you have no permission to change it.
+
+
+.. http:delete:: /api/v1/organizers/(organizer)/events/(event)/exhibitors/(id)/
+
+   Delete an exhibitor.
+
+   .. warning:: This deletes all lead scan data and removes all connections to vouchers (the vouchers are not deleted).
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      DELETE /api/v1/organizers/bigevents/events/sampleconf/exhibitors/1/ 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 id: The ``id`` field of the exhibitor to delete
+   :statuscode 204: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/exhibitor does not exist **or** you have no permission to change it
+
+
+App API
+-------
+
+The App API is used for communication between the pretixLEAD app and the pretix server.
+
+.. warning:: We consider this an internal API, it is not intended for external use. You may still use it, but
+             our :ref:`compatibility commitment <rest-compat>` does not apply.
+
+Authentication
+""""""""""""""
+
+Every exhibitor has an "access code", usually consisting of 8 alphanumeric uppercase characters.
+This access code is communicated to event exhibitors by the event organizers, so this is also what
+exhibitors should enter into a login screen.
+
+All API requests need to contain this access code as a header like this::
+
+    Authorization: Exhibitor ABCDE123
+
+Exhibitor profile
+"""""""""""""""""
+
+Upon login and in regular intervals after that, the API should fetch the exhibitors profile.
+This serves two purposes:
+
+* Checking if the authorization code is actually valid
+
+* Obtaining information that can be shown in the app
+
+The resource consists of the following fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+name                                  string                     Exhibitor name
+booth                                 string                     Booth number (or ``null``)
+event                                 object                     Object describing the event
+├ name                                multi-lingual string       Event name
+├ imprint_url                         string                     URL to legal notice page. If not ``null``, a button in the app should link to this page.
+├ privacy_url                         string                     URL to privacy notice page. If not ``null``, a button in the app should link to this page.
+├ help_url                            string                     URL to help page. If not ``null``, a button in the app should link to this page.
+├ logo_url                            string                     URL to event logo. If not ``null``, this logo may be shown in the app.
+├ slug                                string                     Event short form
+└ organizer                           string                     Organizer short form
+notes                                 boolean                    Specifies whether the exhibitor is allowed to take notes on leads
+tags                                  list of strings            List of tags the exhibitor can assign to their leads
+scan_types                            list of objects            Only used for a special case, fixed value that external API consumers should ignore
+===================================== ========================== =======================================================
+
+.. http:get:: /exhibitors/api/v1/profile
+
+   **Example request:**
+
+   .. sourcecode:: http
+
+    GET /exhibitors/api/v1/profile HTTP/1.1
+    Authorization: Exhibitor ABCDE123
+    Accept: application/json, text/javascript
+
+   **Example response:**
+
+   .. sourcecode:: http
+
+    HTTP/1.1 200 OK
+    Vary: Accept
+    Content-Type: application/json
+
+    {
+      "name": "Aperture Science",
+      "booth": "A2",
+      "event": {
+        "name": {"en": "Sample conference", "de": "Beispielkonferenz"},
+        "slug": "bigevents",
+        "imprint_url": null,
+        "privacy_url": null,
+        "help_url": null,
+        "logo_url": null,
+        "organizer": "sampleconf"
+      },
+      "notes": true,
+      "tags": ["foo", "bar"],
+      "scan_types": [
+        {
+          "key": "lead",
+          "label": "Lead Scanning"
+        }
+      ]
+    }
+
+   :statuscode 200: no error
+   :statuscode 401: Invalid authentication code
+
+Submitting a lead
+"""""""""""""""""
+
+After a ticket/badge is scanned, it should immediately be submitted to the server
+so the scan is stored and information about the person can be shown in the app. The same
+code can be submitted multiple times, so it's no problem to just submit it again after the
+exhibitor set a note or a rating (0-5) inside the app.
+
+On the request, you should set the following properties:
+
+* ``code`` with the scanned barcode
+* ``notes`` with the exhibitor's notes
+* ``scanned`` with the date and time of the actual scan (not the time of the upload)
+* ``scan_type`` set to ``lead`` statically
+* ``tags`` with the list of selected tags
+* ``rating`` with the rating assigned by the exhibitor
+* ``device_name`` with a user-specified name of the device used for scanning (max. 190 characters), or ``null``
+
+If you submit ``tags`` and ``rating`` to be ``null`` and ``notes`` to be ``""``, the server
+responds with the previously saved information and will not delete that information. If you
+supply other values, the information saved on the server will be overridden.
+
+The response will also contain ``tags``, ``rating``, and ``notes``. Additionally,
+it will include ``attendee`` with a list of ``fields`` that can be shown to the
+user. Each field has an internal ``id``, a human-readable ``label``, and a ``value`` (all strings).
+
+Note that the ``fields`` array can contain any number of dynamic keys!
+Depending on the exhibitors permission and event configuration this might be empty,
+or contain lots of details. The app should dynamically show these values (read-only)
+with the labels sent by the server.
+
+The request for this looks like this:
+
+.. http:post:: /exhibitors/api/v1/leads/
+
+   **Example request:**
+
+   .. sourcecode:: http
+
+    POST /exhibitors/api/v1/leads/ HTTP/1.1
+    Authorization: Exhibitor ABCDE123
+    Accept: application/json, text/javascript
+    Content-Type: application/json
+
+    {
+      "code": "qrcodecontent",
+      "notes": "Great customer, wants our newsletter",
+      "scanned": "2020-10-18T12:24:23.000+00:00",
+      "scan_type": "lead",
+      "tags": ["foo"],
+      "rating": 4,
+      "device_name": "DEV1"
+    }
+
+   **Example response:**
+
+   .. sourcecode:: http
+
+    HTTP/1.1 201 Created
+    Vary: Accept
+    Content-Type: application/json
+
+    {
+      "attendee": {
+        "fields": [
+          {
+            "id": "attendee_name",
+            "label": "Name",
+            "value": "Jon Doe",
+            "details": [
+              {"label": "Given name", "value": "John"},
+              {"label": "Family name", "value": "Doe"},
+            ]
+          },
+          {
+            "id": "attendee_email",
+            "label": "Email",
+            "value": "test@example.com",
+            "details": []
+          }
+         ]
+        },
+        "rating": 4,
+        "tags": ["foo"],
+        "notes": "Great customer, wants our newsletter"
+    }
+
+   :statuscode 200: No error, leads was not scanned for the first time
+   :statuscode 201: No error, leads was scanned for the first time
+   :statuscode 400: Invalid data submitted
+   :statuscode 401: Invalid authentication code
+
+You can also fetch existing leads (if you are authorized to do so):
+
+.. http:get:: /exhibitors/api/v1/leads/
+
+   **Example request:**
+
+   .. sourcecode:: http
+
+    GET /exhibitors/api/v1/leads/ HTTP/1.1
+    Authorization: Exhibitor ABCDE123
+    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": [
+        {
+          "attendee": {
+            "fields": [
+              {
+                "id": "attendee_name",
+                "label": "Name",
+                "value": "Jon Doe",
+                "details": [
+                  {"label": "Given name", "value": "John"},
+                  {"label": "Family name", "value": "Doe"},
+                ]
+              },
+              {
+                "id": "attendee_email",
+                "label": "Email",
+                "value": "test@example.com",
+                "details": []
+              }
+           ]
+          },
+          "rating": 4,
+          "tags": ["foo"],
+          "notes": "Great customer, wants our newsletter"
+        }
+      ]
+    }
+
+   :statuscode 200: No error
+   :statuscode 401: Invalid authentication code
+   :statuscode 403: Not permitted to access bulk data

doc/plugins/imported_secrets.rst

@@ -0,0 +1,301 @@
+Secrets Import
+==============
+
+Usually, pretix generates ticket secrets (i.e. the QR code used for scanning) itself. You can read more about this
+process at :ref:`secret_generators`.
+
+With the "Secrets Import" plugin, you can upload your own list of secrets to be used instead. This is useful for
+integrating with third-party check-in systems.
+
+
+API Resource description
+-------------------------
+
+The secrets import plugin provides a HTTP API that allows you to create new secrets.
+
+The imported secret resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+id                                    integer                    Internal ID of the secret
+secret                                string                     Actual string content of the secret (QR code content)
+used                                  boolean                    Whether the secret was already used for a ticket. If ``true``,
+                                                                 the secret can no longer be deleted. Secrets are never used
+                                                                 twice, even if an order is canceled or deleted.
+item                                  integer                    Internal ID of a product, or ``null``. If set, the secret
+                                                                 will only be used for tickets of this product.
+variation                             integer                    Internal ID of a product variation, or ``null``. If set, the secret
+                                                                 will only be used for tickets of this product variation.
+subevent                              integer                    Internal ID of an event series date, or ``null``. If set, the secret
+                                                                 will only be used for tickets of this event series date.
+===================================== ========================== =======================================================
+
+API Endpoints
+-------------
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/
+
+   Returns a list of all secrets imported for an event.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/ 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": [
+          {
+            "id": 1,
+            "secret": "foobar",
+            "used": false,
+            "item": null,
+            "variation": null,
+            "subevent": null
+          }
+        ]
+      }
+
+   :query page: The page number in case of a multi-page result set, default is 1
+   :param organizer: The ``slug`` field of a valid organizer
+   :param event: The ``slug`` field of the event to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer or event does not exist **or** you have no permission to view it.
+
+.. http:get:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/(id)/
+
+   Returns information on one secret, identified by its ID.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/1/ 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
+
+      {
+        "id": 1,
+        "secret": "foobar",
+        "used": false,
+        "item": null,
+        "variation": null,
+        "subevent": null
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param event: The ``slug`` field of the event to fetch
+   :param id: The ``id`` field of the secret to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/secret does not exist **or** you have no permission to view it.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/
+
+   Create a new secret.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 166
+
+      {
+        "secret": "foobar",
+        "used": false,
+        "item": null,
+        "variation": null,
+        "subevent": null
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "secret": "foobar",
+        "used": false,
+        "item": null,
+        "variation": null,
+        "subevent": null
+      }
+
+   :param organizer: The ``slug`` field of the organizer to a create new secret for
+   :param event: The ``slug`` field of the event to create a new secret for
+   :statuscode 201: no error
+   :statuscode 400: The secret could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create secrets.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/bulk_create/
+
+   Create new secrets in bulk (up to 500 per request). The request either succeeds or fails entirely.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/bulk_create/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 166
+
+      [
+        {
+          "secret": "foobar",
+          "used": false,
+          "item": null,
+          "variation": null,
+          "subevent": null
+        },
+        {
+          "secret": "baz",
+          "used": false,
+          "item": null,
+          "variation": null,
+          "subevent": null
+        }
+      ]
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      [
+        {
+          "id": 1,
+          "secret": "foobar",
+          "used": false,
+          "item": null,
+          "variation": null,
+          "subevent": null
+        },
+        {
+          "id": 2,
+          "secret": "baz",
+          "used": false,
+          "item": null,
+          "variation": null,
+          "subevent": null
+        }
+      ]
+
+   :param organizer: The ``slug`` field of the organizer to create new secrets for
+   :param event: The ``slug`` field of the event to create new secrets for
+   :statuscode 201: no error
+   :statuscode 400: The secrets could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create secrets.
+
+
+.. http:patch:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/(id)/
+
+   Update a secret. You can also use ``PUT`` instead of ``PATCH``. With ``PUT``, you have to provide all fields of
+   the resource, other fields will be reset to default. With ``PATCH``, you only need to provide the fields that you
+   want to change.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 34
+
+      {
+        "item": 2
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: text/javascript
+
+      {
+        "id": 1,
+        "secret": "foobar",
+        "used": false,
+        "item": 2,
+        "variation": null,
+        "subevent": null
+      }
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the secret to modify
+   :statuscode 200: no error
+   :statuscode 400: The secret could not be modified due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/secret does not exist **or** you have no permission to change it.
+
+
+.. http:delete:: /api/v1/organizers/(organizer)/events/(event)/imported_secrets/(id)/
+
+   Delete a secret. You can only delete secrets that have not yet been used.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      DELETE /api/v1/organizers/bigevents/events/sampleconf/imported_secrets/1/ 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 id: The ``id`` field of the secret to delete
+   :statuscode 204: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event/secret does not exist **or** you have no permission to change it **or** the secret has already been used
+

doc/plugins/index.rst

@@ -1,3 +1,5 @@
+.. _`plugin-docs`:
+
 Plugin documentation
 ====================
 
@@ -10,11 +12,13 @@ If you want to **create** a plugin, please go to the
    :maxdepth: 2
 
    list
-   pretixdroid
    banktransfer
    ticketoutputpdf
    badges
    campaigns
    certificates
    digital
+   exhibitors
+   imported_secrets
    webinar
+   presale-saml

doc/plugins/list.rst

@@ -5,6 +5,6 @@ List of plugins
 ===============
 
 A detailed list of plugins that are available for pretix can be found on the
-`project website`_.
+`pretix Marketplace`_.
 
-.. _project website: https://pretix.eu/about/en/plugins
+.. _pretix Marketplace: https://marketplace.pretix.eu

doc/plugins/presale-saml.rst

@@ -0,0 +1,405 @@
+.. highlight:: ini
+.. spelling::
+
+   IdP
+   skIDentity
+   ePA
+   NPA
+
+Presale SAML Authentication
+===========================
+
+The Presale SAML Authentication plugin is an advanced plugin, which most event
+organizers will not need to use. However, for the select few  who do require
+strong customer authentication that cannot be covered by the built-in customer
+account functionality, this plugin allows pretix to connect to a SAML IdP and
+perform authentication and retrieval of user information.
+
+Usage of the plugin is governed by two separate sets of settings: The plugin
+installation, the Service Provider (SP) configuration and the event
+configuration.
+
+Plugin installation and initial configuration
+---------------------------------------------
+
+.. note:: If you are a customer of our hosted `pretix.eu`_ offering, you can
+          skip this section.
+
+The plugin is installed as any other plugin in the pretix ecosystem. As a
+pretix system administrator, please follow the instructions in the the
+:ref:`Administrator documentation <admindocs>`.
+
+Once installed, you will need to assess, if you want (or need) your pretix
+instance to be a single SP for all organizers and events or if every event
+organizer has to provide their own SP.
+
+Take the example of a university which runs pretix under an pretix Enterprise
+agreement. Since they only provide ticketing services to themselves (every
+organizer is still just a different department of the same university), a
+single SP should be enough.
+
+On the other hand, a reseller such as `pretix.eu`_ who services a multitude
+of clients would not work that way. Here, every organizer is a separate
+legal entity and as such will also need to provide their own SP configuration:
+Company A will expect their SP to reflect their company - and not a generalized
+"pretix SP".
+
+Once you have decided on the mode of operation, the :ref:`Configuration file
+<config>` needs to be extended to reflect your choice.
+
+Example::
+
+    [presale-saml]
+    level=global
+
+``level``
+    ``global`` to use only a single, system-wide SP, ``organizer`` for multiple
+    SPs, configured on the organizer-level. Defaults to ``organizer``.
+
+Service Provider configuration
+------------------------------
+
+Global Level
+^^^^^^^^^^^^
+
+.. note:: If you are a customer of our hosted `pretix.eu`_ offering, you can
+          skip this section and follow the instructions on the upcoming
+          Organizer Level settings.
+
+As a user with administrative privileges, please activate them by clicking the
+`Admin Mode` button in the top right hand corner.
+
+You should now see a new menu-item titled `SAML` appear.
+
+Organizer Level
+^^^^^^^^^^^^^^^
+
+Navigate to the organizer settings in the pretix backend. In the navigation
+bar, you will find a menu-item titled `SAML` if your user has the `Can
+change organizer settings` permission.
+
+
+.. note:: If you are a customer of our hosted `pretix.eu`_ offering, the menu
+          will only appear once one of our friendly customer service agents
+          has enabled the Presale SAML Authentication plugin for at least one
+          of your events. Feel free to get in touch with us!
+
+Setting up the SP
+^^^^^^^^^^^^^^^^^
+
+No matter where your SP configuration lives, you will be greeted by a very
+long list of fields of which almost all of them will need to be filled. Please
+don't be discouraged - most of the settings don't need to be decided by yourself
+and/or are already preset with a sensible default setting.
+
+If you are not sure what setting you should choose for any of the fields, you
+should reach out to your IdP operator as they can tell you exactly what the IdP
+expects and - more importantly - supports.
+
+``IdP Metadata URL``
+    Please provide the URL where your IdP outputs its metadata. For most IdPs,
+    this URL is static and the same for all SPs. If you are a member of the
+    DFN-AAI, you can find the meta-data for the `Test-, Basic- and
+    Advanced-Federation`_ on their website. Please do talk with your local
+    IdP operator though, as you might not even need to go through the DFN-AAI
+    and might just use your institutions local IdP which will also host their
+    metadata on a different URL.
+
+    The URL needs to be publicly accessible, as saving the settings form will
+    fail if the IdP metadata cannot be retrieved. pretix will also automatically
+    refresh the IdP metadata on a regular basis.
+
+``SP Entity Id``
+    By default, we recommend that you use the system-proposed metadata-URL as
+    the Entity Id of your SP. However, if so desired or required by your IdP,
+    you can also set any other, arbitrary URL as the SP Entity Id.
+
+``SP Name / SP Decription``
+    Most IdP will display the name and description of your SP to the users
+    during authentication. The description field can be used to explain to the
+    users how their data is being used.
+
+``SP X.509 Certificate / SP X.509 Private Key``
+    Your SP needs a certificate and a private key for said certificate. Please
+    coordinate with your IdP, if you are supposed to generate these yourself or
+    if they are provided to you.
+
+``SP X.509 New Certificate``
+    As certificates have an expiry date, they need to be renewed on a regular
+    basis. In order to facilitate the rollover from the expiring to the new
+    certificate, you can provide the new certificate already before the expiration
+    of the existing one. That way, the system will automatically use the correct
+    one. Once the old certificate has expired and is not used anymore at all,
+    you can move the new certificate into the slot of the normal certificate and
+    keep the new slot empty for your next renewal process.
+
+``Requested Attributes``
+    An IdP can hold a variety of attributes of an authenticating user. While
+    your IdP will dictate which of the available attributes your SP can consume
+    in theory, you will still need to define exactly which attributes the SP
+    should request.
+
+    The notation is a JSON list of objects with 5 attributes each:
+
+      * ``attributeValue``: Can be defaulted to ``[]``.
+      * ``friendlyName``: String used in the upcoming event-level settings to
+        retrieve the attributes data.
+      * ``isRequired``: Boolean indicating whether the IdP must enforce the
+        transmission of this attribute. In most cases, ``true`` is the best
+        choice.
+      * ``name``: String of the internal, technical name of the requested
+        attribute. Often starting with ``urn:mace:dir:attribute-def:``,
+        ``urn:oid:`` or ``http://``/``https://``.
+      * ``nameFormat``: String describing the type of ``name`` that has been
+        set in the previous section. Often starting with
+        ``urn:mace:shibboleth:1.0:`` or ``urn:oasis:names:tc:SAML:2.0:``.
+
+    Your IdP can provide you with a list of available attributes. See below
+    for a sample configuration in an academic context.
+
+    Note, that you can have multiple attributes with the same ``friendlyName``
+    but different ``name``s. This is often used in systems, where the same
+    information (for example a persons name) is saved in different fields -
+    for example because one institution is returning SAML 1.0 and other
+    institutions are returning SAML 2.0 style attributes. Typically, this only
+    occurs in mix environments like the DFN-AAI with a large number of
+    participants. If you are only using your own institutions IdP and not
+    authenticating anyone outside of your realm, this should not be a common
+    sight.
+
+``Encrypt/Sign/Require ...``
+    Does what is says on the box - please inquire with your IdP for the
+    necessary settings. Most settings can be turned on as they increase security,
+    however some IdPs might stumble over some of them.
+
+``Signature / Digest Algorithm``
+    Please chose appropriate algorithms, that both pretix/your SP and the IdP
+    can communicate with. A common source of issues when connecting to a
+    Shibboleth-based IdP is the Digest Algorithm: pretix does not support
+    ``http://www.w3.org/2009/xmlenc11#rsa-oaep`` and authentication will fail
+    if the IdP enforces this.
+
+``Technical/Support Contacts``
+    Those contacts are encoded into the SPs public meta data and might be
+    displayed to users having trouble authenticating. It is recommended to
+    provide a dedicated point of contact for technical issues, as those will
+    be the ones to change the configuration for the SP.
+
+Event / Authentication configuration
+------------------------------------
+
+Basic settings
+^^^^^^^^^^^^^^
+
+Once the plugin has been enabled for a pretix event using the Plugins-menu from
+the event's settings, a new *SAML* menu item will show up.
+
+On this page, the actual authentication can be configured.
+
+``Checkout Explanation``
+    Since most users probably won't be familiar with why they have to authenticate
+    to buy a ticket, you can provide them a small blurb here. Markdown is supported.
+
+``Attribute RegEx``
+    By default, any successful authentication with the IdP will allow the user to
+    proceed with their purchase. Should the allowed audience needed to be restricted
+    further, a set of regular Expressions can be used to do this.
+
+    An Attribute RegEx of ``{}`` will allow any authenticated user to pass.
+
+    A RegEx of ``{ "affiliation": "^(employee@pretix.eu|staff@pretix.eu)$" }`` will
+    only allow user to pass which have the ``affiliation`` attribute and whose
+    attribute either matches ``employee@pretix.eu`` or ``staff@pretix.eu``.
+
+    Please make sure that the attribute you are querying is also requested from the
+    IdP in the first place - for a quick check you can have a look at the top of
+    the page where all currently configured attributes are listed.
+
+``RegEx Fail Explanation``
+    Only used in conjunction with the above Attribute RegEx. Should the user not
+    pass the restrictions imposed by the regular expression, the user is shown
+    this error-message.
+
+    If you are - for example in an university context - restricting access to
+    students only, you might want to explain here that Employees are not allowed
+    to book tickets.
+
+``Ticket Secret SAML Attribute``
+    In very specific instances, it might be desirable that the ticket-secret is
+    not the randomly one generated by pretix but rather based on one of the
+    users attributes - for example their unique ID or access card number.
+
+    To achieve this, the name of a SAML-attribute can be specified here.
+
+    It is however necessary to note, that even with this setting in use,
+    ticket-secrets need to be unique. This is why when this setting is enabled,
+    the default, pretix-generated ticket-secret is prefixed with the attributes
+    value.
+
+    Example: A users ``cardid`` attribute has the value of ``01189998819991197253``.
+    The default random ticket secret would have been
+    ``yczygpw9877akz2xwdhtdyvdqwkv7npj``. The resulting new secret will now be
+    ``01189998819991197253_yczygpw9877akz2xwdhtdyvdqwkv7npj``.
+
+    That way, the ticket secret is still unique, but when checking into an event,
+    the user can easily be searched and found using their identifier.
+
+IdP-provided E-Mail addresses, names
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+By default, pretix will only authenticate the user and not process the received
+data any further.
+
+However, there are a few exceptions to this rule.
+
+There are a few `magic` attributes that pretix will use to automatically populate
+the corresponding fields within the checkout process **and lock them out from
+user editing**.
+
+  * ``givenName`` and ``sn``: If both of those attributes are present and pretix
+    is configured to collect the users name, these attributes' values are used
+    for the given and family name respectively.
+  * ``email``: If this attribute is present, the E-Mail-address of the users will
+    be set to the one transmitted through the attributes.
+
+The latter might pose a problem, if the IdP is transmitting an ``email`` attribute
+which does contain a system-level mail address which is only used as an internal
+identifier but not as a real mailbox. In this case, please consider setting the
+``friendlyName`` of the attribute to a different value than ``email`` or removing
+this field from the list of requested attributes altogether.
+
+Saving attributes to questions
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+By setting the ``internal identifier`` of a user-defined question to the same name
+as a SAML attribute, pretix will save the value of said attribute into the question.
+
+All the same as in the above section on E-Mail addresses, those fields become
+non-editable by the user.
+
+Please be aware that some specialty question types might not be compatible with
+the SAML attributes due to specific format requirements. If in doubt (or if the
+checkout fails/the information is not properly saved), try setting the question
+type to a simple type like "Text (one line)".
+
+Notes and configuration examples
+--------------------------------
+
+Requesting SAML 1.0 and 2.0 attributes from an academic IdP
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This requests the ``eduPersonPrincipalName`` (also sometimes called EPPN),
+``email``, ``givenName`` and ``sn`` both in SAML 1.0 and SAML 2.0 attributes.
+
+.. sourcecode:: json
+
+    [
+        {
+            "attributeValue": [],
+            "friendlyName": "eduPersonPrincipalName",
+            "isRequired": true,
+            "name": "urn:mace:dir:attribute-def:eduPersonPrincipalName",
+            "nameFormat": "urn:mace:shibboleth:1.0:attributeNamespace:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "eduPersonPrincipalName",
+            "isRequired": true,
+            "name": "urn:oid:1.3.6.1.4.1.5923.1.1.1.6",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "email",
+            "isRequired": true,
+            "name": "urn:mace:dir:attribute-def:mail",
+            "nameFormat": "urn:mace:shibboleth:1.0:attributeNamespace:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "email",
+            "isRequired": true,
+            "name": "urn:oid:0.9.2342.19200300.100.1.3",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "givenName",
+            "isRequired": true,
+            "name": "urn:mace:dir:attribute-def:givenName",
+            "nameFormat": "urn:mace:shibboleth:1.0:attributeNamespace:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "givenName",
+            "isRequired": true,
+            "name": "urn:oid:2.5.4.42",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "sn",
+            "isRequired": true,
+            "name": "urn:mace:dir:attribute-def:sn",
+            "nameFormat": "urn:mace:shibboleth:1.0:attributeNamespace:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "sn",
+            "isRequired": true,
+            "name": "urn:oid:2.5.4.4",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        }
+    ]
+
+skIDentity IdP Metadata URL
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Since the IdP Metadata URL for `skIDentity`_ is not readily documented/visible
+in their backend, we document it here:
+``https://service.skidentity.de/fs/saml/metadata``
+
+Requesting skIDentity attributes for electronic identity cards
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This requests the basic ``eIdentifier``, ``IDType``, ``IDIssuer``, and
+``NameID`` from the `skIDentity`_ SAML service, which are available for
+electronic ID cards such as the German ePA/NPA. (Other attributes such as
+the name and address are available at additional cost from the IdP).
+
+.. sourcecode:: json
+
+    [
+        {
+            "attributeValue": [],
+            "friendlyName": "eIdentifier",
+            "isRequired": true,
+            "name": "http://www.skidentity.de/att/eIdentifier",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "IDType",
+            "isRequired": true,
+            "name": "http://www.skidentity.de/att/IDType",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "IDIssuer",
+            "isRequired": true,
+            "name": "http://www.skidentity.de/att/IDIssuer",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        },
+        {
+            "attributeValue": [],
+            "friendlyName": "NameID",
+            "isRequired": true,
+            "name": "http://www.skidentity.de/att/NameID",
+            "nameFormat": "urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
+        }
+    ]
+
+.. _pretix.eu: https://pretix.eu
+.. _Test-, Basic- and Advanced-Federation: https://doku.tid.dfn.de/en:metadata
+.. _skIDentity: https://www.skidentity.de/

doc/plugins/pretixdroid.rst

@@ -1,368 +0,0 @@
-pretixdroid HTTP API
-====================
-
-The pretixdroid plugin provides a HTTP API that the `pretixdroid Android app`_
-uses to communicate with the pretix server.
-
-.. warning:: This API is **DEPRECATED** and will probably go away soon. It is used **only** to serve the pretixdroid
-             Android app. There are no backwards compatibility guarantees on this API. We will not add features that
-             are not required for the  Android App. There is a general-purpose :ref:`rest-api` that provides all
-             features that you need to check in.
-
-.. versionchanged:: 1.12
-
-   Support for check-in-time questions has been added. The new API features are fully backwards-compatible and
-   negotiated live, so clients which do not need this feature can ignore the change. For this reason, the API version
-   has not been increased and is still set to 3.
-
-.. versionchanged:: 1.13
-
-   Support for checking in unpaid tickets has been added.
-
-
-.. http:post:: /pretixdroid/api/(organizer)/(event)/redeem/
-
-   Redeems a ticket, i.e. checks the user in.
-
-   **Example request**:
-
-   .. sourcecode:: http
-
-      POST /pretixdroid/api/demoorga/democon/redeem/?key=ABCDEF HTTP/1.1
-      Host: demo.pretix.eu
-      Accept: application/json, text/javascript
-      Content-Type: application/x-www-form-urlencoded
-
-      secret=az9u4mymhqktrbupmwkvv6xmgds5dk3&questions_supported=true
-
-   You **must** set the parameter secret.
-
-   You **must** set the parameter ``questions_supported`` to ``true`` **if** you support asking questions
-   back to the app operator. You **must not** set it if you do not support this feature. In that case, questions
-   will just be ignored.
-
-   You **may** set the additional parameter ``datetime`` in the body containing an ISO8601-encoded
-   datetime of the entry attempt. If you don"t, the current date and time will be used.
-
-   You **may** set the additional parameter ``force`` to indicate that the request should be logged
-   regardless of previous check-ins for the same ticket. This might be useful if you made the entry decision offline.
-   Questions will also always be ignored in this case (i.e. supplied answers will be saved, but no error will be
-   thrown if they are missing or invalid).
-
-   You **may** set the additional parameter ``nonce`` with a globally unique random value to identify this
-   check-in. This is meant to be used to prevent duplicate check-ins when you are just retrying after a connection
-   failure.
-
-   You **may** set the additional parameter ``ignore_unpaid`` to indicate that the check-in should be performed even
-   if the order is in pending state.
-
-   If questions are supported and required, you will receive a dictionary ``questions`` containing details on the
-   particular questions to ask. To answer them, just re-send your redemption request with additional parameters of
-   the form ``answer_<question>=<answer>``, e.g. ``answer_12=24``.
-
-   **Example successful response**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "status": "ok"
-        "version": 3,
-        "data": {
-          "secret": "az9u4mymhqktrbupmwkvv6xmgds5dk3",
-          "order": "ABCDE",
-          "item": "Standard ticket",
-          "item_id": 1,
-          "variation": null,
-          "variation_id": null,
-          "attendee_name": "Peter Higgs",
-          "attention": false,
-          "redeemed": true,
-          "checkin_allowed": true,
-          "addons_text": "Parking spot",
-          "paid": true
-        }
-      }
-
-   **Example response with required questions**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "status": "incomplete"
-        "version": 3
-        "data": {
-          "secret": "az9u4mymhqktrbupmwkvv6xmgds5dk3",
-          "order": "ABCDE",
-          "item": "Standard ticket",
-          "item_id": 1,
-          "variation": null,
-          "variation_id": null,
-          "attendee_name": "Peter Higgs",
-          "attention": false,
-          "redeemed": true,
-          "checkin_allowed": true,
-          "addons_text": "Parking spot",
-          "paid": true
-        },
-        "questions": [
-          {
-            "id": 12,
-            "type": "C",
-            "question": "Choose a shirt size",
-            "required": true,
-            "position": 2,
-            "items": [1],
-            "options": [
-              {
-                "id": 24,
-                "answer": "M"
-              },
-              {
-                "id": 25,
-                "answer": "L"
-              }
-            ]
-          }
-        ]
-      }
-
-   **Example error response with data**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "status": "error",
-        "reason": "already_redeemed",
-        "version": 3,
-        "data": {
-          "secret": "az9u4mymhqktrbupmwkvv6xmgds5dk3",
-          "order": "ABCDE",
-          "item": "Standard ticket",
-          "item_id": 1,
-          "variation": null,
-          "variation_id": null,
-          "attendee_name": "Peter Higgs",
-          "attention": false,
-          "redeemed": true,
-          "checkin_allowed": true,
-          "addons_text": "Parking spot",
-          "paid": true
-        }
-      }
-
-   **Example error response without data**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "status": "error",
-        "reason": "unkown_ticket",
-        "version": 3
-      }
-
-   Possible error reasons:
-
-   * ``unpaid`` - Ticket is not paid for or has been refunded
-   * ``already_redeemed`` - Ticket already has been redeemed
-   * ``product`` - Tickets with this product may not be scanned at this device
-   * ``unknown_ticket`` - Secret does not match a ticket in the database
-
-   :query key: Secret API key
-   :statuscode 200: Valid request
-   :statuscode 404: Unknown organizer or event
-   :statuscode 403: Invalid authorization key
-
-.. http:get:: /pretixdroid/api/(organizer)/(event)/search/
-
-   Searches for a ticket.
-   At most 25 results will be returned. **Queries with less than 4 characters will always return an empty result set.**
-
-   **Example request**:
-
-   .. sourcecode:: http
-
-      GET /pretixdroid/api/demoorga/democon/search/?key=ABCDEF&query=Peter HTTP/1.1
-      Host: demo.pretix.eu
-      Accept: application/json, text/javascript
-
-   **Example response**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "results": [
-          {
-            "secret": "az9u4mymhqktrbupmwkvv6xmgds5dk3",
-            "order": "ABCE6",
-            "item": "Standard ticket",
-            "variation": null,
-            "attendee_name": "Peter Higgs",
-            "redeemed": false,
-            "attention": false,
-            "checkin_allowed": true,
-            "addons_text": "Parking spot",
-            "paid": true
-          },
-          ...
-        ],
-        "version": 3
-      }
-
-   :query query: Search query
-   :query key: Secret API key
-   :statuscode 200: Valid request
-   :statuscode 404: Unknown organizer or event
-   :statuscode 403: Invalid authorization key
-
-.. http:get:: /pretixdroid/api/(organizer)/(event)/download/
-
-   Download data for all tickets.
-
-   **Example request**:
-
-   .. sourcecode:: http
-
-      GET /pretixdroid/api/demoorga/democon/download/?key=ABCDEF HTTP/1.1
-      Host: demo.pretix.eu
-      Accept: application/json, text/javascript
-
-   **Example response**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "version": 3,
-        "results": [
-          {
-            "secret": "az9u4mymhqktrbupmwkvv6xmgds5dk3",
-            "order": "ABCE6",
-            "item": "Standard ticket",
-            "variation": null,
-            "attendee_name": "Peter Higgs",
-            "redeemed": false,
-            "attention": false,
-            "checkin_allowed": true,
-            "paid": true
-          },
-          ...
-        ],
-        "questions": [
-          {
-            "id": 12,
-            "type": "C",
-            "question": "Choose a shirt size",
-            "required": true,
-            "position": 2,
-            "items": [1],
-            "options": [
-              {
-                "id": 24,
-                "answer": "M"
-              },
-              {
-                "id": 25,
-                "answer": "L"
-              }
-            ]
-          }
-        ]
-      }
-
-   :query key: Secret API key
-   :statuscode 200: Valid request
-   :statuscode 404: Unknown organizer or event
-   :statuscode 403: Invalid authorization key
-
-.. http:get:: /pretixdroid/api/(organizer)/(event)/status/
-
-   Returns status information, such as the total number of tickets and the
-   number of performed check-ins.
-
-   **Example request**:
-
-   .. sourcecode:: http
-
-      GET /pretixdroid/api/demoorga/democon/status/?key=ABCDEF HTTP/1.1
-      Host: demo.pretix.eu
-      Accept: application/json, text/javascript
-
-   **Example response**:
-
-   .. sourcecode:: http
-
-      HTTP/1.1 200 OK
-      Content-Type: text/json
-
-      {
-        "checkins": 17,
-        "total": 42,
-        "version": 3,
-        "event": {
-          "name": "Demo Conference",
-          "slug": "democon",
-          "date_from": "2016-12-27T17:00:00Z",
-          "date_to": "2016-12-30T18:00:00Z",
-          "timezone": "UTC",
-          "url": "https://demo.pretix.eu/demoorga/democon/",
-          "organizer": {
-            "name": "Demo Organizer",
-            "slug": "demoorga"
-          },
-        },
-        "items": [
-          {
-            "name": "T-Shirt",
-            "id": 1,
-            "checkins": 1,
-            "admission": False,
-            "total": 1,
-            "variations": [
-              {
-                "name": "Red",
-                "id": 1,
-                "checkins": 1,
-                "total": 12
-              },
-              {
-               "name": "Blue",
-                "id": 2,
-                "checkins": 4,
-                "total": 8
-              }
-            ]
-          },
-          {
-            "name": "Ticket",
-            "id": 2,
-            "checkins": 15,
-            "admission": True,
-            "total": 22,
-            "variations": []
-          }
-        ]
-      }
-
-   :query key: Secret API key
-   :statuscode 200: Valid request
-   :statuscode 404: Unknown organizer or event
-   :statuscode 403: Invalid authorization key
-
-.. _pretixdroid Android app: https://github.com/pretix/pretixdroid

doc/requirements.txt

@@ -1,5 +1,6 @@
 -e ../src/
 sphinx==2.3.*
+jinja2==3.0.*
 sphinx-rtd-theme
 sphinxcontrib-httpdomain
 sphinxcontrib-images

doc/spelling_wordlist.txt

@@ -103,6 +103,7 @@ prepending
 preprocessor
 presale
 pretix
+pretixLEAD
 pretixSCAN
 pretixdroid
 pretixPOS

doc/user/events/email.rst

@@ -203,4 +203,4 @@ Then, please contact support@pretix.eu and we will enable DKIM for your domain o
 
 
 .. _Sender Policy Framework: https://en.wikipedia.org/wiki/Sender_Policy_Framework
-.. _SPF specification: http://www.openspf.org/SPF_Record_Syntax
+.. _SPF specification: http://www.open-spf.org/SPF_Record_Syntax

doc/user/events/ticket_secrets.rst

@@ -1,3 +1,5 @@
+.. _secret_generators:
+
 Ticket secret generators
 ========================
 

doc/user/events/widget.rst

@@ -253,18 +253,21 @@ If you want, you can suppress us loading the widget and/or modify the user data
 
 If you then later want to trigger loading the widgets, just call ``window.PretixWidget.buildWidgets()``.
 
-Waiting for the widget to load
+Waiting for the widget to load or close
-------------------------------
+---------------------------------------
 
-If you want to run custom JavaScript once the widget is fully loaded, you can register a callback function. Note that
+If you want to run custom JavaScript once the widget is fully loaded or when it is closed, you can register callback
-this function might be run multiple times, for example if you have multiple widgets on a page or if the user switches
+functions. Note that these function might be run multiple times, for example if you have multiple widgets on a page
-e.g. from an event list to an event detail view::
+or if the user switches e.g. from an event list to an event detail view::
 
     <script type="text/javascript">
     window.pretixWidgetCallback = function () {
         window.PretixWidget.addLoadListener(function () {
             console.log("Widget has loaded!");
         });
+        window.PretixWidget.addCloseListener(function () {
+            console.log("Widget has been closed!");
+        });
     }
     </script>
 
@@ -309,6 +312,10 @@ Currently, the following attributes are understood by pretix itself:
   always be modified. Note that this is not a security feature and can easily be overridden by users, so do not rely
   on this for authentication.
 
+* If ``data-consent="…"`` is given, the cookie consent mechanism will be initialized with consent for the given cookie
+  providers. All other providers will be disabled, no consent dialog will be shown. This is useful if you already
+  asked the user for consent and don't want them to be asked again. Example: ``data-consent="facebook,google_analytics"``
+
 Any configured pretix plugins might understand more data fields. For example, if the appropriate plugins on pretix
 Hosted or pretix Enterprise are active, you can pass the following fields:
 

src/MANIFEST.in

@@ -13,6 +13,7 @@ recursive-include pretix/plugins/banktransfer/static *
 recursive-include pretix/plugins/manualpayment/templates *
 recursive-include pretix/plugins/manualpayment/static *
 recursive-include pretix/plugins/paypal/templates *
+recursive-include pretix/plugins/paypal/static *
 recursive-include pretix/plugins/pretixdroid/templates *
 recursive-include pretix/plugins/pretixdroid/static *
 recursive-include pretix/plugins/sendmail/templates *

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__ = "4.5.0.dev0"
+__version__ = "4.9.1"

src/pretix/api/auth/devicesecurity.py

@@ -167,6 +167,8 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:checkinlist-list'),
         ('POST', 'api-v1:checkinlistpos-redeem'),
         ('POST', 'plugins:pretix_posbackend:order.posprintlog'),
+        ('POST', 'plugins:pretix_posbackend:order.poslock'),
+        ('DELETE', 'plugins:pretix_posbackend:order.poslock'),
         ('DELETE', 'api-v1:cartposition-detail'),
         ('GET', 'api-v1:giftcard-list'),
         ('POST', 'api-v1:giftcard-transact'),
@@ -174,8 +176,11 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('POST', 'plugins:pretix_posbackend:posreceipt-list'),
         ('POST', 'plugins:pretix_posbackend:posclosing-list'),
         ('POST', 'plugins:pretix_posbackend:posdebugdump-list'),
+        ('POST', 'plugins:pretix_posbackend:posdebuglogentry-list'),
+        ('POST', 'plugins:pretix_posbackend:posdebuglogentry-bulk-create'),
         ('GET', 'plugins:pretix_posbackend:poscashier-list'),
         ('POST', 'plugins:pretix_posbackend:stripeterminal.token'),
+        ('PUT', 'plugins:pretix_posbackend:file.upload'),
         ('GET', 'api-v1:revokedsecrets-list'),
         ('GET', 'api-v1:event.settings'),
         ('GET', 'plugins:pretix_seating:event.event'),

src/pretix/api/serializers/checkin.py

@@ -60,7 +60,7 @@ class CheckinListSerializer(I18nAwareModelSerializer):
         full_data = self.to_internal_value(self.to_representation(self.instance)) if self.instance else {}
         full_data.update(data)
 
-        for item in full_data.get('limit_products'):
+        for item in full_data.get('limit_products', []):
             if event != item.event:
                 raise ValidationError(_('One or more items do not belong to this event.'))
 

src/pretix/api/serializers/event.py

@@ -637,7 +637,7 @@ class SubEventSerializer(I18nAwareModelSerializer):
 class TaxRuleSerializer(CountryFieldMixin, I18nAwareModelSerializer):
     class Meta:
         model = TaxRule
-        fields = ('id', 'name', 'rate', 'price_includes_tax', 'eu_reverse_charge', 'home_country')
+        fields = ('id', 'name', 'rate', 'price_includes_tax', 'eu_reverse_charge', 'home_country', 'internal_name', 'keep_gross_if_rate_changes')
 
 
 class EventSettingsSerializer(SettingsSerializer):
@@ -713,7 +713,6 @@ class EventSettingsSerializer(SettingsSerializer):
         'ticket_download_require_validated_email',
         'ticket_secret_length',
         'mail_prefix',
-        'mail_from',
         'mail_from_name',
         'mail_attach_ical',
         'mail_attach_tickets',

src/pretix/api/serializers/item.py

@@ -58,8 +58,9 @@ class InlineItemVariationSerializer(I18nAwareModelSerializer):
     class Meta:
         model = ItemVariation
         fields = ('id', 'value', 'active', 'description',
-                  'position', 'default_price', 'price', 'original_price',
+                  'position', 'default_price', 'price', 'original_price', 'require_approval',
-                  'require_membership', 'require_membership_types', 'require_membership_hidden', 'available_from', 'available_until',
+                  'require_membership', 'require_membership_types',
+                  'require_membership_hidden', 'available_from', 'available_until',
                   'sales_channels', 'hide_without_voucher',)
 
     def __init__(self, *args, **kwargs):
@@ -74,8 +75,9 @@ class ItemVariationSerializer(I18nAwareModelSerializer):
     class Meta:
         model = ItemVariation
         fields = ('id', 'value', 'active', 'description',
-                  'position', 'default_price', 'price', 'original_price',
+                  'position', 'default_price', 'price', 'original_price', 'require_approval',
-                  'require_membership', 'require_membership_types', 'require_membership_hidden', 'available_from', 'available_until',
+                  'require_membership', 'require_membership_types',
+                  'require_membership_hidden', 'available_from', 'available_until',
                   'sales_channels', 'hide_without_voucher',)
 
     def __init__(self, *args, **kwargs):
@@ -249,9 +251,12 @@ class ItemSerializer(I18nAwareModelSerializer):
         bundles_data = validated_data.pop('bundles') if 'bundles' in validated_data else {}
         meta_data = validated_data.pop('meta_data', None)
         picture = validated_data.pop('picture', None)
+        require_membership_types = validated_data.pop('require_membership_types', [])
         item = Item.objects.create(**validated_data)
         if picture:
             item.picture.save(os.path.basename(picture.name), picture)
+        if require_membership_types:
+            item.require_membership_types.add(*require_membership_types)
 
         for variation_data in variations_data:
             require_membership_types = variation_data.pop('require_membership_types', [])

src/pretix/api/serializers/order.py

@@ -424,88 +424,7 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
             self.fields.pop('pdf_data', None)
 
     def validate(self, data):
-        if data.get('attendee_name') and data.get('attendee_name_parts'):
+        raise TypeError("this serializer is readonly")
-            raise ValidationError(
-                {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
-            )
-        if data.get('attendee_name_parts') and '_scheme' not in data.get('attendee_name_parts'):
-            data['attendee_name_parts']['_scheme'] = self.context['request'].event.settings.name_scheme
-
-        if data.get('country'):
-            if not pycountry.countries.get(alpha_2=data.get('country').code):
-                raise ValidationError(
-                    {'country': ['Invalid country code.']}
-                )
-
-        if data.get('state'):
-            cc = str(data.get('country') or self.instance.country or '')
-            if cc not in COUNTRIES_WITH_STATE_IN_ADDRESS:
-                raise ValidationError(
-                    {'state': ['States are not supported in country "{}".'.format(cc)]}
-                )
-            if not pycountry.subdivisions.get(code=cc + '-' + data.get('state')):
-                raise ValidationError(
-                    {'state': ['"{}" is not a known subdivision of the country "{}".'.format(data.get('state'), cc)]}
-                )
-        return data
-
-    def update(self, instance, validated_data):
-        # Even though all fields that shouldn't be edited are marked as read_only in the serializer
-        # (hopefully), we'll be extra careful here and be explicit about the model fields we update.
-        update_fields = [
-            'attendee_name_parts', 'company', 'street', 'zipcode', 'city', 'country',
-            'state', 'attendee_email',
-        ]
-        answers_data = validated_data.pop('answers', None)
-
-        name = validated_data.pop('attendee_name', '')
-        if name and not validated_data.get('attendee_name_parts'):
-            validated_data['attendee_name_parts'] = {
-                '_legacy': name
-            }
-
-        for attr, value in validated_data.items():
-            if attr in update_fields:
-                setattr(instance, attr, value)
-
-        instance.save(update_fields=update_fields)
-
-        if answers_data is not None:
-            qs_seen = set()
-            answercache = {
-                a.question_id: a for a in instance.answers.all()
-            }
-            for answ_data in answers_data:
-                options = answ_data.pop('options', [])
-                if answ_data['question'].pk in qs_seen:
-                    raise ValidationError(f'Question {answ_data["question"]} was sent twice.')
-                if answ_data['question'].pk in answercache:
-                    a = answercache[answ_data['question'].pk]
-                    if isinstance(answ_data['answer'], File):
-                        a.file.save(answ_data['answer'].name, answ_data['answer'], save=False)
-                        a.answer = 'file://' + a.file.name
-                    elif a.answer.startswith('file://') and answ_data['answer'] == "file:keep":
-                        pass  # keep current file
-                    else:
-                        for attr, value in answ_data.items():
-                            setattr(a, attr, value)
-                    a.save()
-                else:
-                    if isinstance(answ_data['answer'], File):
-                        an = answ_data.pop('answer')
-                        a = instance.answers.create(**answ_data, answer='')
-                        a.file.save(os.path.basename(an.name), an, save=False)
-                        a.answer = 'file://' + a.file.name
-                        a.save()
-                    else:
-                        a = instance.answers.create(**answ_data)
-                a.options.set(options)
-                qs_seen.add(a.question_id)
-            for qid, a in answercache.items():
-                if qid not in qs_seen:
-                    a.delete()
-
-        return instance
 
 
 class RequireAttentionField(serializers.Field):
@@ -593,7 +512,7 @@ class OrderPaymentDateField(serializers.DateField):
 class OrderFeeSerializer(I18nAwareModelSerializer):
     class Meta:
         model = OrderFee
-        fields = ('fee_type', 'value', 'description', 'internal_type', 'tax_rate', 'tax_value', 'tax_rule', 'canceled')
+        fields = ('id', 'fee_type', 'value', 'description', 'internal_type', 'tax_rate', 'tax_value', 'tax_rule', 'canceled')
 
 
 class PaymentURLField(serializers.URLField):
@@ -934,7 +853,8 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
     consume_carts = serializers.ListField(child=serializers.CharField(), required=False)
     force = serializers.BooleanField(default=False, required=False)
     payment_date = serializers.DateTimeField(required=False, allow_null=True)
-    send_email = serializers.BooleanField(default=False, required=False)
+    send_email = serializers.BooleanField(default=False, required=False, allow_null=True)
+    require_approval = serializers.BooleanField(default=False, required=False)
     simulate = serializers.BooleanField(default=False, required=False)
     customer = serializers.SlugRelatedField(slug_field='identifier', queryset=Customer.objects.none(), required=False)
 
@@ -947,7 +867,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         model = Order
         fields = ('code', 'status', 'testmode', 'email', 'phone', 'locale', 'payment_provider', 'fees', 'comment', 'sales_channel',
                   'invoice_address', 'positions', 'checkin_attention', 'payment_info', 'payment_date', 'consume_carts',
-                  'force', 'send_email', 'simulate', 'customer', 'custom_followup_at')
+                  'force', 'send_email', 'simulate', 'customer', 'custom_followup_at', 'require_approval')
 
     def validate_payment_provider(self, pp):
         if pp is None:
@@ -1041,6 +961,8 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         force = validated_data.pop('force', False)
         simulate = validated_data.pop('simulate', False)
         self._send_mail = validated_data.pop('send_email', False)
+        if self._send_mail is None:
+            self._send_mail = validated_data.get('sales_channel') in self.context['event'].settings.mail_sales_channel_placed_paid
 
         if 'invoice_address' in validated_data:
             iadata = validated_data.pop('invoice_address')
@@ -1219,6 +1141,8 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
             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()
@@ -1356,14 +1280,18 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                     f.order = order._wrapped if simulate else order
                     f._calculate_tax()
                     fees.append(f)
-                    if not simulate:
+                    if simulate:
+                        f.id = 0
+                    else:
                         f.save()
             else:
                 f = OrderFee(**fee_data)
                 f.order = order._wrapped if simulate else order
                 f._calculate_tax()
                 fees.append(f)
-                if not simulate:
+                if simulate:
+                    f.id = 0
+                else:
                     f.save()
 
         order.total += sum([f.value for f in fees])
@@ -1426,7 +1354,7 @@ class InlineInvoiceLineSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = InvoiceLine
-        fields = ('position', 'description', 'item', 'variation', 'attendee_name', 'event_date_from',
+        fields = ('position', 'description', 'item', 'variation', 'subevent', 'attendee_name', 'event_date_from',
                   'event_date_to', 'gross_value', 'tax_value', 'tax_rate', 'tax_name', 'fee_type',
                   'fee_internal_type', 'event_location')
 

src/pretix/api/serializers/orderchange.py

@@ -0,0 +1,424 @@
+#
+# 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 logging
+import os
+
+import pycountry
+from django.core.files import File
+from rest_framework import serializers
+from rest_framework.exceptions import ValidationError
+
+from pretix.api.serializers.order import (
+    AnswerCreateSerializer, AnswerSerializer, CompatibleCountryField,
+    OrderPositionCreateSerializer,
+)
+from pretix.base.models import ItemVariation, Order, OrderFee, OrderPosition
+from pretix.base.services.orders import OrderError
+from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
+
+logger = logging.getLogger(__name__)
+
+
+class OrderPositionCreateForExistingOrderSerializer(OrderPositionCreateSerializer):
+    order = serializers.SlugRelatedField(slug_field='code', queryset=Order.objects.none(), required=True, allow_null=False)
+    answers = AnswerCreateSerializer(many=True, required=False)
+    addon_to = serializers.IntegerField(required=False, allow_null=True)
+    secret = serializers.CharField(required=False)
+    attendee_name = serializers.CharField(required=False, allow_null=True)
+    seat = serializers.CharField(required=False, allow_null=True)
+    price = serializers.DecimalField(required=False, allow_null=True, decimal_places=2,
+                                     max_digits=10)
+    country = CompatibleCountryField(source='*')
+
+    class Meta:
+        model = OrderPosition
+        fields = ('order', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
+                  'company', 'street', 'zipcode', 'city', 'country', 'state',
+                  'secret', 'addon_to', 'subevent', 'answers', 'seat')
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['order'].queryset = self.context['event'].orders.all()
+        self.fields['item'].queryset = self.context['event'].items.all()
+        self.fields['subevent'].queryset = self.context['event'].subevents.all()
+        self.fields['seat'].queryset = self.context['event'].seats.all()
+        self.fields['variation'].queryset = ItemVariation.objects.filter(item__event=self.context['event'])
+        if 'order' in self.context:
+            del self.fields['order']
+
+    def validate(self, data):
+        data = super().validate(data)
+        if data.get('addon_to'):
+            try:
+                data['addon_to'] = data['order'].positions.get(positionid=data['addon_to'])
+            except OrderPosition.DoesNotExist:
+                raise ValidationError({
+                    'addon_to': ['addon_to refers to an unknown position ID for this order.']
+                })
+        return data
+
+    def create(self, validated_data):
+        ocm = self.context['ocm']
+
+        try:
+            ocm.add_position(
+                item=validated_data['item'],
+                variation=validated_data.get('variation'),
+                price=validated_data.get('price'),
+                addon_to=validated_data.get('addon_to'),
+                subevent=validated_data.get('subevent'),
+                seat=validated_data.get('seat'),
+            )
+            if self.context.get('commit', True):
+                ocm.commit()
+                return validated_data['order'].positions.order_by('-positionid').first()
+            else:
+                return OrderPosition()  # fake to appease DRF
+        except OrderError as e:
+            raise ValidationError(str(e))
+
+
+class OrderPositionInfoPatchSerializer(serializers.ModelSerializer):
+    answers = AnswerSerializer(many=True)
+    country = CompatibleCountryField(source='*')
+    attendee_name = serializers.CharField(required=False)
+
+    class Meta:
+        model = OrderPosition
+        fields = (
+            'attendee_name', 'attendee_name_parts', 'company', 'street', 'zipcode', 'city', 'country',
+            'state', 'attendee_email', 'answers',
+        )
+
+    def validate(self, data):
+        if data.get('attendee_name') and data.get('attendee_name_parts'):
+            raise ValidationError(
+                {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
+            )
+        if data.get('attendee_name_parts') and '_scheme' not in data.get('attendee_name_parts'):
+            data['attendee_name_parts']['_scheme'] = self.context['request'].event.settings.name_scheme
+
+        if data.get('country'):
+            if not pycountry.countries.get(alpha_2=data.get('country').code):
+                raise ValidationError(
+                    {'country': ['Invalid country code.']}
+                )
+
+        if data.get('state'):
+            cc = str(data.get('country') or self.instance.country or '')
+            if cc not in COUNTRIES_WITH_STATE_IN_ADDRESS:
+                raise ValidationError(
+                    {'state': ['States are not supported in country "{}".'.format(cc)]}
+                )
+            if not pycountry.subdivisions.get(code=cc + '-' + data.get('state')):
+                raise ValidationError(
+                    {'state': ['"{}" is not a known subdivision of the country "{}".'.format(data.get('state'), cc)]}
+                )
+        return data
+
+    def update(self, instance, validated_data):
+        answers_data = validated_data.pop('answers', None)
+
+        name = validated_data.pop('attendee_name', '')
+        if name and not validated_data.get('attendee_name_parts'):
+            validated_data['attendee_name_parts'] = {
+                '_legacy': name
+            }
+
+        for attr, value in validated_data.items():
+            if attr in self.fields:
+                setattr(instance, attr, value)
+
+        instance.save(update_fields=list(validated_data.keys()))
+
+        if answers_data is not None:
+            qs_seen = set()
+            answercache = {
+                a.question_id: a for a in instance.answers.all()
+            }
+            for answ_data in answers_data:
+                options = answ_data.pop('options', [])
+                if answ_data['question'].pk in qs_seen:
+                    raise ValidationError(f'Question {answ_data["question"]} was sent twice.')
+                if answ_data['question'].pk in answercache:
+                    a = answercache[answ_data['question'].pk]
+                    if isinstance(answ_data['answer'], File):
+                        a.file.save(answ_data['answer'].name, answ_data['answer'], save=False)
+                        a.answer = 'file://' + a.file.name
+                    elif a.answer.startswith('file://') and answ_data['answer'] == "file:keep":
+                        pass  # keep current file
+                    else:
+                        for attr, value in answ_data.items():
+                            setattr(a, attr, value)
+                    a.save()
+                else:
+                    if isinstance(answ_data['answer'], File):
+                        an = answ_data.pop('answer')
+                        a = instance.answers.create(**answ_data, answer='')
+                        a.file.save(os.path.basename(an.name), an, save=False)
+                        a.answer = 'file://' + a.file.name
+                        a.save()
+                    else:
+                        a = instance.answers.create(**answ_data)
+                a.options.set(options)
+                qs_seen.add(a.question_id)
+            for qid, a in answercache.items():
+                if qid not in qs_seen:
+                    a.delete()
+
+        return instance
+
+
+class OrderPositionChangeSerializer(serializers.ModelSerializer):
+    seat = serializers.CharField(source='seat.seat_guid', allow_null=True, required=False)
+
+    class Meta:
+        model = OrderPosition
+        fields = (
+            'item', 'variation', 'subevent', 'seat', 'price', 'tax_rule',
+        )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['item'].queryset = self.context['event'].items.all()
+        self.fields['subevent'].queryset = self.context['event'].subevents.all()
+        self.fields['tax_rule'].queryset = self.context['event'].tax_rules.all()
+        if kwargs.get('partial'):
+            for k, v in self.fields.items():
+                self.fields[k].required = False
+
+    def validate_item(self, item):
+        if item.event != self.context['event']:
+            raise ValidationError(
+                'The specified item does not belong to this event.'
+            )
+        return item
+
+    def validate_subevent(self, subevent):
+        if self.context['event'].has_subevents:
+            if not subevent:
+                raise ValidationError(
+                    'You need to set a subevent.'
+                )
+            if subevent.event != self.context['event']:
+                raise ValidationError(
+                    'The specified subevent does not belong to this event.'
+                )
+        elif subevent:
+            raise ValidationError(
+                'You cannot set a subevent for this event.'
+            )
+        return subevent
+
+    def validate(self, data, instance=None):
+        instance = instance or self.instance
+        if instance is None:
+            return data  # needs to be done later
+        if data.get('item', instance.item):
+            if data.get('item', instance.item).has_variations:
+                if not data.get('variation', instance.variation):
+                    raise ValidationError({'variation': ['You should specify a variation for this item.']})
+                else:
+                    if data.get('variation', instance.variation).item != data.get('item', instance.item):
+                        raise ValidationError(
+                            {'variation': ['The specified variation does not belong to the specified item.']}
+                        )
+            elif data.get('variation', instance.variation):
+                raise ValidationError(
+                    {'variation': ['You cannot specify a variation for this item.']}
+                )
+
+        return data
+
+    def update(self, instance, validated_data):
+        ocm = self.context['ocm']
+        current_seat = {'seat_guid': instance.seat.seat_guid} if instance.seat else None
+        item = validated_data.get('item', instance.item)
+        variation = validated_data.get('variation', instance.variation)
+        subevent = validated_data.get('subevent', instance.subevent)
+        price = validated_data.get('price', instance.price)
+        seat = validated_data.get('seat', current_seat)
+        tax_rule = validated_data.get('tax_rule', instance.tax_rule)
+
+        change_item = None
+        if item != instance.item or variation != instance.variation:
+            change_item = (item, variation)
+
+        change_subevent = None
+        if self.context['event'].has_subevents and subevent != instance.subevent:
+            change_subevent = (subevent,)
+
+        try:
+            if change_item is not None and change_subevent is not None:
+                ocm.change_item_and_subevent(instance, *change_item, *change_subevent)
+            elif change_item is not None:
+                ocm.change_item(instance, *change_item)
+            elif change_subevent is not None:
+                ocm.change_subevent(instance, *change_subevent)
+
+            if seat != current_seat or change_subevent:
+                ocm.change_seat(instance, seat['seat_guid'] if seat else None)
+
+            if price != instance.price:
+                ocm.change_price(instance, price)
+
+            if tax_rule != instance.tax_rule:
+                ocm.change_tax_rule(instance, tax_rule)
+
+            if self.context.get('commit', True):
+                ocm.commit()
+                instance.refresh_from_db()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        return instance
+
+
+class PatchPositionSerializer(serializers.Serializer):
+    position = serializers.PrimaryKeyRelatedField(queryset=OrderPosition.all.none())
+
+    def validate_position(self, value):
+        self.fields['body'].instance = value  # hack around DRFs validation order
+        return value
+
+    def validate(self, data):
+        OrderPositionChangeSerializer(context=self.context, partial=True).validate(data['body'], data['position'])
+        return data
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['position'].queryset = self.context['order'].positions.all()
+        self.fields['body'] = OrderPositionChangeSerializer(context=self.context, partial=True)
+
+
+class SelectPositionSerializer(serializers.Serializer):
+    position = serializers.PrimaryKeyRelatedField(queryset=OrderPosition.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['position'].queryset = self.context['order'].positions.all()
+
+
+class OrderFeeChangeSerializer(serializers.ModelSerializer):
+
+    class Meta:
+        model = OrderFee
+        fields = (
+            'value',
+        )
+
+    def update(self, instance, validated_data):
+        ocm = self.context['ocm']
+        value = validated_data.get('value', instance.value)
+
+        try:
+            if value != instance.value:
+                ocm.change_fee(instance, value)
+
+            if self.context.get('commit', True):
+                ocm.commit()
+                instance.refresh_from_db()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        return instance
+
+
+class PatchFeeSerializer(serializers.Serializer):
+    fee = serializers.PrimaryKeyRelatedField(queryset=OrderFee.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['fee'].queryset = self.context['order'].fees.all()
+        self.fields['body'] = OrderFeeChangeSerializer(context=self.context)
+
+
+class SelectFeeSerializer(serializers.Serializer):
+    fee = serializers.PrimaryKeyRelatedField(queryset=OrderFee.all.none())
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not self.context:
+            return
+        self.fields['fee'].queryset = self.context['order'].fees.all()
+
+
+class OrderChangeOperationSerializer(serializers.Serializer):
+    send_email = serializers.BooleanField(default=False, required=False)
+    reissue_invoice = serializers.BooleanField(default=True, required=False)
+    recalculate_taxes = serializers.ChoiceField(default=None, allow_null=True, required=False, choices=[
+        ('keep_net', 'keep_net'),
+        ('keep_gross', 'keep_gross'),
+    ])
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(self, *args, **kwargs)
+        self.fields['patch_positions'] = PatchPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['cancel_positions'] = SelectPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['create_positions'] = OrderPositionCreateForExistingOrderSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['split_positions'] = SelectPositionSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['patch_fees'] = PatchFeeSerializer(
+            many=True, required=False, context=self.context
+        )
+        self.fields['cancel_fees'] = SelectFeeSerializer(
+            many=True, required=False, context=self.context
+        )
+
+    def validate(self, data):
+        seen_positions = set()
+        for d in data.get('patch_positions', []):
+            print(d, seen_positions)
+            if d['position'] in seen_positions:
+                raise ValidationError({'patch_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_positions = set()
+        for d in data.get('cancel_positions', []):
+            if d['position'] in seen_positions:
+                raise ValidationError({'cancel_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_positions = set()
+        for d in data.get('split_positions', []):
+            if d['position'] in seen_positions:
+                raise ValidationError({'split_positions': ['You have specified the same object twice.']})
+            seen_positions.add(d['position'])
+        seen_fees = set()
+        for d in data.get('patch_fees', []):
+            if d['fee'] in seen_fees:
+                raise ValidationError({'patch_fees': ['You have specified the same object twice.']})
+            seen_positions.add(d['fee'])
+        seen_fees = set()
+        for d in data.get('cancel_fees', []):
+            if d['fee'] in seen_fees:
+                raise ValidationError({'cancel_fees': ['You have specified the same object twice.']})
+            seen_positions.add(d['fee'])
+
+        return data

src/pretix/api/serializers/organizer.py

@@ -296,7 +296,14 @@ class OrganizerSettingsSerializer(SettingsSerializer):
         'theme_round_borders',
         'primary_font',
         'organizer_logo_image_inherit',
-        'organizer_logo_image'
+        'organizer_logo_image',
+        'privacy_url',
+        'cookie_consent',
+        'cookie_consent_dialog_title',
+        'cookie_consent_dialog_text',
+        'cookie_consent_dialog_text_secondary',
+        'cookie_consent_dialog_button_yes',
+        'cookie_consent_dialog_button_no',
     ]
 
     def __init__(self, *args, **kwargs):

src/pretix/api/views/checkin.py

@@ -408,6 +408,11 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
         ignore_unpaid = bool(self.request.data.get('ignore_unpaid', False))
         nonce = self.request.data.get('nonce')
 
+        untrusted_input = (
+            self.request.GET.get('untrusted_input', '') not in ('0', 'false', 'False', '')
+            or (isinstance(self.request.auth, Device) and 'pretixscan' in (self.request.auth.software_brand or '').lower())
+        )
+
         if 'datetime' in self.request.data:
             dt = DateTimeField().to_internal_value(self.request.data.get('datetime'))
         else:
@@ -427,7 +432,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
 
         try:
             queryset = self.get_queryset(ignore_status=True, ignore_products=True)
-            if self.kwargs['pk'].isnumeric():
+            if self.kwargs['pk'].isnumeric() and not untrusted_input:
                 op = queryset.get(Q(pk=self.kwargs['pk']) | Q(secret=self.kwargs['pk']))
             else:
                 # In application/x-www-form-urlencoded, you can encodes space ' ' with '+' instead of '%20'.

src/pretix/api/views/device.py

@@ -42,6 +42,7 @@ class InitializationRequestSerializer(serializers.Serializer):
     hardware_model = serializers.CharField(max_length=190)
     software_brand = serializers.CharField(max_length=190)
     software_version = serializers.CharField(max_length=190)
+    info = serializers.JSONField(required=False, allow_null=True)
 
 
 class UpdateRequestSerializer(serializers.Serializer):
@@ -49,6 +50,7 @@ class UpdateRequestSerializer(serializers.Serializer):
     hardware_model = serializers.CharField(max_length=190)
     software_brand = serializers.CharField(max_length=190)
     software_version = serializers.CharField(max_length=190)
+    info = serializers.JSONField(required=False, allow_null=True)
 
 
 class GateSerializer(serializers.ModelSerializer):
@@ -94,6 +96,7 @@ class InitializeView(APIView):
         device.hardware_model = serializer.validated_data.get('hardware_model')
         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.api_token = generate_api_token()
         device.save()
 
@@ -114,6 +117,7 @@ class UpdateView(APIView):
         device.hardware_model = serializer.validated_data.get('hardware_model')
         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.save()
         device.log_action('pretix.device.updated', data=serializer.validated_data, auth=device)
 

src/pretix/api/views/exporters.py

@@ -132,7 +132,7 @@ class EventExportersViewSet(ExportersMixin, viewsets.ViewSet):
     def exporters(self):
         exporters = []
         responses = register_data_exporters.send(self.request.event)
-        for ex in sorted([response(self.request.event, self.request.organizer) for r, response in responses], key=lambda ex: str(ex.verbose_name)):
+        for ex in sorted([response(self.request.event, self.request.organizer) for r, response in responses if response], key=lambda ex: str(ex.verbose_name)):
             ex._serializer = JobRunSerializer(exporter=ex)
             exporters.append(ex)
         return exporters
@@ -147,7 +147,11 @@ class OrganizerExportersViewSet(ExportersMixin, viewsets.ViewSet):
     @cached_property
     def exporters(self):
         exporters = []
-        events = (self.request.auth or self.request.user).get_events_with_permission('can_view_orders', request=self.request).filter(
+        if isinstance(self.request.auth, (Device, TeamAPIToken)):
+            perm_holder = self.request.auth
+        else:
+            perm_holder = self.request.user
+        events = perm_holder.get_events_with_permission('can_view_orders', request=self.request).filter(
             organizer=self.request.organizer
         )
         responses = register_multievent_data_exporters.send(self.request.organizer)
@@ -157,8 +161,12 @@ class OrganizerExportersViewSet(ExportersMixin, viewsets.ViewSet):
         return exporters
 
     def get_serializer_kwargs(self):
+        if isinstance(self.request.auth, (Device, TeamAPIToken)):
+            perm_holder = self.request.auth
+        else:
+            perm_holder = self.request.user
         return {
-            'events': self.request.auth.get_events_with_permission('can_view_orders', request=self.request).filter(
+            'events': perm_holder.get_events_with_permission('can_view_orders', request=self.request).filter(
                 organizer=self.request.organizer
             )
         }

src/pretix/api/views/order.py

@@ -36,7 +36,7 @@ from django.utils.translation import gettext as _
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_scopes import scopes_disabled
 from PIL import Image
-from rest_framework import mixins, serializers, status, viewsets
+from rest_framework import serializers, status, viewsets
 from rest_framework.decorators import action
 from rest_framework.exceptions import (
     APIException, NotFound, PermissionDenied, ValidationError,
@@ -53,6 +53,12 @@ from pretix.api.serializers.order import (
     PriceCalcSerializer, RevokedTicketSecretSerializer,
     SimulatedOrderSerializer,
 )
+from pretix.api.serializers.orderchange import (
+    OrderChangeOperationSerializer, OrderFeeChangeSerializer,
+    OrderPositionChangeSerializer,
+    OrderPositionCreateForExistingOrderSerializer,
+    OrderPositionInfoPatchSerializer,
+)
 from pretix.base.i18n import language
 from pretix.base.models import (
     CachedCombinedTicket, CachedTicket, Checkin, Device, Event, Invoice,
@@ -94,6 +100,7 @@ with scopes_disabled():
         search = django_filters.CharFilter(method='search_qs')
         item = django_filters.CharFilter(field_name='all_positions', lookup_expr='item_id')
         variation = django_filters.CharFilter(field_name='all_positions', lookup_expr='variation_id')
+        subevent = django_filters.CharFilter(field_name='all_positions', lookup_expr='subevent_id')
 
         class Meta:
             model = Order
@@ -143,7 +150,8 @@ with scopes_disabled():
             matching_positions = OrderPosition.objects.filter(
                 Q(order=OuterRef('pk')) & Q(
                     Q(attendee_name_cached__icontains=u) | Q(attendee_email__icontains=u)
-                    | Q(secret__istartswith=u) | Q(voucher__code__icontains=u)
+                    | Q(secret__istartswith=u)
+                    # | Q(voucher__code__icontains=u)  # temporarily removed since it caused bad query performance on postgres
                 )
             ).values('id')
 
@@ -337,6 +345,7 @@ class OrderViewSet(viewsets.ModelViewSet):
     @action(detail=True, methods=['POST'])
     def mark_canceled(self, request, **kwargs):
         send_mail = request.data.get('send_email', True)
+        comment = request.data.get('comment', None)
         cancellation_fee = request.data.get('cancellation_fee', None)
         if cancellation_fee:
             try:
@@ -359,6 +368,7 @@ class OrderViewSet(viewsets.ModelViewSet):
                 device=request.auth if isinstance(request.auth, Device) else None,
                 oauth_application=request.auth.application if isinstance(request.auth, OAuthAccessToken) else None,
                 send_mail=send_mail,
+                email_comment=comment,
                 cancellation_fee=cancellation_fee
             )
         except OrderError as e:
@@ -643,9 +653,13 @@ class OrderViewSet(viewsets.ModelViewSet):
             if send_mail:
                 free_flow = (
                     payment and order.total == Decimal('0.00') and order.status == Order.STATUS_PAID and
-                    not order.require_approval and payment.provider == "free"
+                    not order.require_approval and payment.provider in ("free", "boxoffice")
                 )
-                if free_flow:
+                if order.require_approval:
+                    email_template = request.event.settings.mail_text_order_placed_require_approval
+                    log_entry = 'pretix.event.order.email.order_placed_require_approval'
+                    email_attendees = False
+                elif free_flow:
                     email_template = request.event.settings.mail_text_order_free
                     log_entry = 'pretix.event.order.email.order_free'
                     email_attendees = request.event.settings.mail_send_order_free_attendee
@@ -658,12 +672,13 @@ class OrderViewSet(viewsets.ModelViewSet):
 
                 _order_placed_email(
                     request.event, order, payment.payment_provider if payment else None, email_template,
-                    log_entry, invoice, payment
+                    log_entry, invoice, payment, is_free=free_flow
                 )
                 if email_attendees:
                     for p in order.positions.all():
                         if p.addon_to_id is None and p.attendee_email and p.attendee_email != order.email:
-                            _order_placed_email_attendee(request.event, order, p, email_attendees_template, log_entry)
+                            _order_placed_email_attendee(request.event, order, p, email_attendees_template, log_entry,
+                                                         is_free=free_flow)
 
                 if not free_flow and order.status == Order.STATUS_PAID and payment:
                     payment._send_paid_mail(invoice, None, '')
@@ -776,6 +791,79 @@ class OrderViewSet(viewsets.ModelViewSet):
         with transaction.atomic():
             self.get_object().gracefully_delete(user=self.request.user if self.request.user.is_authenticated else None, auth=self.request.auth)
 
+    @action(detail=True, methods=['POST'])
+    def change(self, request, **kwargs):
+        order = self.get_object()
+
+        serializer = OrderChangeOperationSerializer(
+            context={'order': order, **self.get_serializer_context()},
+            data=request.data,
+        )
+        serializer.is_valid(raise_exception=True)
+
+        try:
+            ocm = OrderChangeManager(
+                order=order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=serializer.validated_data.get('send_email', False),
+                reissue_invoice=serializer.validated_data.get('reissue_invoice', True),
+            )
+
+            canceled_positions = set()
+            for r in serializer.validated_data.get('cancel_positions', []):
+                ocm.cancel(r['position'])
+                canceled_positions.add(r['position'])
+
+            for r in serializer.validated_data.get('patch_positions', []):
+                if r['position'] in canceled_positions:
+                    continue
+                pos_serializer = OrderPositionChangeSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                    partial=True,
+                )
+                pos_serializer.update(r['position'], r['body'])
+
+            for r in serializer.validated_data.get('split_positions', []):
+                if r['position'] in canceled_positions:
+                    continue
+                ocm.split(r['position'])
+
+            for r in serializer.validated_data.get('create_positions', []):
+                pos_serializer = OrderPositionCreateForExistingOrderSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                )
+                pos_serializer.create(r)
+
+            canceled_fees = set()
+            for r in serializer.validated_data.get('cancel_fees', []):
+                ocm.cancel_fee(r['fee'])
+                canceled_fees.add(r['fee'])
+
+            for r in serializer.validated_data.get('patch_fees', []):
+                if r['fee'] in canceled_fees:
+                    continue
+                pos_serializer = OrderFeeChangeSerializer(
+                    context={'ocm': ocm, 'commit': False, 'event': request.event, **self.get_serializer_context()},
+                )
+                pos_serializer.update(r['fee'], r['body'])
+
+            if serializer.validated_data.get('recalculate_taxes') == 'keep_net':
+                ocm.recalculate_taxes(keep='net')
+            elif serializer.validated_data.get('recalculate_taxes') == 'keep_gross':
+                ocm.recalculate_taxes(keep='gross')
+
+            ocm.commit()
+        except OrderError as e:
+            raise ValidationError(str(e))
+
+        order.refresh_from_db()
+        serializer = OrderSerializer(
+            instance=order,
+            context=self.get_serializer_context(),
+        )
+        return Response(serializer.data)
+
 
 with scopes_disabled():
     class OrderPositionFilter(FilterSet):
@@ -817,7 +905,7 @@ with scopes_disabled():
             }
 
 
-class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSet):
+class OrderPositionViewSet(viewsets.ModelViewSet):
     serializer_class = OrderPositionSerializer
     queryset = OrderPosition.all.none()
     filter_backends = (DjangoFilterBackend, OrderingFilter)
@@ -1054,6 +1142,25 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
                 )
                 return resp
 
+    @action(detail=True, methods=['POST'])
+    def regenerate_secrets(self, request, **kwargs):
+        instance = self.get_object()
+        try:
+            ocm = OrderChangeManager(
+                instance.order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=self.request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+            ocm.regenerate_secret(instance)
+            ocm.commit()
+        except OrderError as e:
+            raise ValidationError(str(e))
+        except Quota.QuotaExceededException as e:
+            raise ValidationError(str(e))
+        return self.retrieve(request, [], **kwargs)
+
     def perform_destroy(self, instance):
         try:
             ocm = OrderChangeManager(
@@ -1069,18 +1176,33 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
         except Quota.QuotaExceededException as e:
             raise ValidationError(str(e))
 
-    def update(self, request, *args, **kwargs):
+    def create(self, request, *args, **kwargs):
-        partial = kwargs.get('partial', False)
-        if not partial:
-            return Response(
-                {"detail": "Method \"PUT\" not allowed."},
-                status=status.HTTP_405_METHOD_NOT_ALLOWED,
-            )
-        return super().update(request, *args, **kwargs)
-
-    def perform_update(self, serializer):
         with transaction.atomic():
-            old_data = self.get_serializer_class()(instance=serializer.instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionCreateForExistingOrderSerializer(
+                data=request.data,
+                context=self.get_serializer_context(),
+            )
+            serializer.is_valid(raise_exception=True)
+            order = serializer.validated_data['order']
+            ocm = OrderChangeManager(
+                order=order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+            serializer.context['ocm'] = ocm
+            serializer.save()
+
+            # Fields that can be easily patched after the position was added
+            old_data = OrderPositionInfoPatchSerializer(instance=serializer.instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionInfoPatchSerializer(
+                instance=serializer.instance,
+                context=self.get_serializer_context(),
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
             serializer.save()
             new_data = serializer.data
 
@@ -1103,9 +1225,77 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, vi
                         ]
                     }
                 )
+                tickets.invalidate_cache.apply_async(
+                    kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
+                order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+        return Response(
+            OrderPositionSerializer(serializer.instance, context=self.get_serializer_context()).data,
+            status=status.HTTP_201_CREATED,
+        )
 
-        tickets.invalidate_cache.apply_async(kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
+    def update(self, request, *args, **kwargs):
-        order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+        partial = kwargs.get('partial', False)
+        if not partial:
+            return Response(
+                {"detail": "Method \"PUT\" not allowed."},
+                status=status.HTTP_405_METHOD_NOT_ALLOWED,
+            )
+
+        with transaction.atomic():
+            instance = self.get_object()
+            ocm = OrderChangeManager(
+                order=instance.order,
+                user=self.request.user if self.request.user.is_authenticated else None,
+                auth=request.auth,
+                notify=False,
+                reissue_invoice=False,
+            )
+
+            # Field that need to go through OrderChangeManager
+            serializer = OrderPositionChangeSerializer(
+                instance=instance,
+                context={'ocm': ocm, **self.get_serializer_context()},
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+
+            # Fields that can be easily patched
+            old_data = OrderPositionInfoPatchSerializer(instance=instance, context=self.get_serializer_context()).data
+            serializer = OrderPositionInfoPatchSerializer(
+                instance=instance,
+                context=self.get_serializer_context(),
+                partial=True,
+                data=request.data
+            )
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+            new_data = serializer.data
+
+            if old_data != new_data:
+                log_data = self.request.data
+                if 'answers' in log_data:
+                    for a in new_data['answers']:
+                        log_data[f'question_{a["question"]}'] = a["answer"]
+                    log_data.pop('answers', None)
+                serializer.instance.order.log_action(
+                    'pretix.event.order.modified',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'data': [
+                            dict(
+                                position=serializer.instance.pk,
+                                **log_data
+                            )
+                        ]
+                    }
+                )
+                tickets.invalidate_cache.apply_async(kwargs={'event': serializer.instance.order.event.pk, 'order': serializer.instance.order.pk})
+                order_modified.send(sender=serializer.instance.order.event, order=serializer.instance.order)
+
+        return Response(self.get_serializer_class()(instance=serializer.instance, context=self.get_serializer_context()).data)
 
 
 class PaymentViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):

src/pretix/base/auth.py

@@ -94,6 +94,9 @@ class BaseAuthBackend:
         This method will be called after the user filled in the login form. ``request`` will contain
         the current request and ``form_data`` the input for the form fields defined in ``login_form_fields``.
         You are expected to either return a ``User`` object (if login was successful) or ``None``.
+
+        You are expected to either return a ``User`` object (if login was successful) or ``None``. You should
+        obtain this user object using ``User.objects.get_or_create_for_backend``.
         """
         return
 
@@ -104,7 +107,9 @@ class BaseAuthBackend:
         reverse proxy, you can directly return a ``User`` object that will be logged in.
 
         ``request`` will contain the current request.
-        You are expected to either return a ``User`` object (if login was successful) or ``None``.
+
+        You are expected to either return a ``User`` object (if login was successful) or ``None``. You should
+        obtain this user object using ``User.objects.get_or_create_for_backend``.
         """
         return
 
@@ -146,7 +151,8 @@ class NativeAuthBackend(BaseAuthBackend):
         d = OrderedDict([
             ('email', forms.EmailField(label=_("E-mail"), max_length=254,
                                        widget=forms.EmailInput(attrs={'autofocus': 'autofocus'}))),
-            ('password', forms.CharField(label=_("Password"), widget=forms.PasswordInput)),
+            ('password', forms.CharField(label=_("Password"), widget=forms.PasswordInput,
+                                         max_length=4096)),
         ])
         return d
 

src/pretix/base/email.py

@@ -25,6 +25,7 @@ from datetime import timedelta
 from decimal import Decimal
 from itertools import groupby
 from smtplib import SMTPResponseException
+from typing import TypeVar
 
 import css_inline
 from django.conf import settings
@@ -32,6 +33,7 @@ from django.core.mail.backends.smtp import EmailBackend
 from django.db.models import Count
 from django.dispatch import receiver
 from django.template.loader import get_template
+from django.utils.formats import date_format
 from django.utils.timezone import now
 from django.utils.translation import (
     get_language, gettext_lazy as _, pgettext_lazy,
@@ -49,23 +51,23 @@ from pretix.base.templatetags.rich_text import markdown_compile_email
 
 logger = logging.getLogger('pretix.base.email')
 
+T = TypeVar("T", bound=EmailBackend)
 
-class CustomSMTPBackend(EmailBackend):
 
-    def test(self, from_addr):
+def test_custom_smtp_backend(backend: T, from_addr: str) -> None:
-        try:
+    try:
-            self.open()
+        backend.open()
-            self.connection.ehlo_or_helo_if_needed()
+        backend.connection.ehlo_or_helo_if_needed()
-            (code, resp) = self.connection.mail(from_addr, [])
+        (code, resp) = backend.connection.mail(from_addr, [])
-            if code != 250:
+        if code != 250:
-                logger.warn('Error testing mail settings, code %d, resp: %s' % (code, resp))
+            logger.warning('Error testing mail settings, code %d, resp: %s' % (code, resp))
-                raise SMTPResponseException(code, resp)
+            raise SMTPResponseException(code, resp)
-            (code, resp) = self.connection.rcpt('testdummy@pretix.eu')
+        (code, resp) = backend.connection.rcpt('testdummy@pretix.eu')
-            if (code != 250) and (code != 251):
+        if (code != 250) and (code != 251):
-                logger.warn('Error testing mail settings, code %d, resp: %s' % (code, resp))
+            logger.warning('Error testing mail settings, code %d, resp: %s' % (code, resp))
-                raise SMTPResponseException(code, resp)
+            raise SMTPResponseException(code, resp)
-        finally:
+    finally:
-            self.close()
+        backend.close()
 
 
 class BaseHTMLMailRenderer:
@@ -163,9 +165,20 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
                 has_addons=Count('addons')
             ))
             htmlctx['cart'] = [(k, list(v)) for k, v in groupby(
-                positions, key=lambda op: (
+                sorted(
-                    op.item, op.variation, op.subevent, op.attendee_name,
+                    positions,
-                    (op.pk if op.addon_to_id else None), (op.pk if op.has_addons else None)
+                    key=lambda op: (
+                        (op.addon_to.positionid if op.addon_to_id else op.positionid),
+                        op.positionid
+                    )
+                ),
+                key=lambda op: (
+                    op.item,
+                    op.variation,
+                    op.subevent,
+                    op.attendee_name,
+                    op.addon_to_id,
+                    (op.pk if op.has_addons else None)
                 )
             )]
 
@@ -297,7 +310,11 @@ def get_email_context(**kwargs):
             val = [val]
         for v in val:
             if all(rp in kwargs for rp in v.required_context):
-                ctx[v.identifier] = v.render(kwargs)
+                try:
+                    ctx[v.identifier] = v.render(kwargs)
+                except:
+                    ctx[v.identifier] = '(error)'
+                    logger.exception(f'Failed to process email placeholder {v.identifier}.')
     return ctx
 
 
@@ -452,6 +469,15 @@ def base_placeholders(sender, **kwargs):
                 }
             ),
         ),
+        SimpleFunctionalMailTextPlaceholder(
+            'event_location', ['event_or_subevent'], lambda event_or_subevent: str(event_or_subevent.location or ''),
+            lambda event: str(event.location or ''),
+        ),
+        SimpleFunctionalMailTextPlaceholder(
+            'event_admission_time', ['event_or_subevent'],
+            lambda event_or_subevent: date_format(event_or_subevent.date_admission, 'TIME_FORMAT') if event_or_subevent.date_admission else '',
+            lambda event: date_format(event.date_admission, 'TIME_FORMAT') if event.date_admission else '',
+        ),
         SimpleFunctionalMailTextPlaceholder(
             'subevent', ['waiting_list_entry', 'event'],
             lambda waiting_list_entry, event: str(waiting_list_entry.subevent or event),
@@ -621,6 +647,10 @@ def base_placeholders(sender, **kwargs):
             'meta_%s' % k, ['event'], lambda event, k=k: event.meta_data[k],
             v
         ))
+        ph.append(SimpleFunctionalMailTextPlaceholder(
+            'meta_%s' % k, ['event_or_subevent'], lambda event_or_subevent, k=k: event_or_subevent.meta_data[k],
+            v
+        ))
 
     return ph
 

src/pretix/base/exporter.py

@@ -33,7 +33,6 @@
 # License for the specific language governing permissions and limitations under the License.
 
 import io
-import re
 import tempfile
 from collections import OrderedDict, namedtuple
 from decimal import Decimal
@@ -46,26 +45,13 @@ from django.conf import settings
 from django.db.models import QuerySet
 from django.utils.formats import localize
 from django.utils.translation import gettext, gettext_lazy as _
-from openpyxl import Workbook
-from openpyxl.cell.cell import ILLEGAL_CHARACTERS_RE, KNOWN_TYPES, Cell
 
 from pretix.base.models import Event
+from pretix.helpers.safe_openpyxl import (  # NOQA: backwards compatibility for plugins using excel_safe
+    SafeWorkbook, remove_invalid_excel_chars as excel_safe,
+)
 
-
+__ = excel_safe  # just so the compatbility import above is "used" and doesn't get removed by linter
-def excel_safe(val):
-    if isinstance(val, Cell):
-        return val
-
-    if not isinstance(val, KNOWN_TYPES):
-        val = str(val)
-
-    if isinstance(val, bytes):
-        val = val.decode("utf-8", errors="ignore")
-
-    if isinstance(val, str):
-        val = re.sub(ILLEGAL_CHARACTERS_RE, '', val)
-
-    return val
 
 
 class BaseExporter:
@@ -228,7 +214,7 @@ class ListExporter(BaseExporter):
         pass
 
     def _render_xlsx(self, form_data, output_file=None):
-        wb = Workbook(write_only=True)
+        wb = SafeWorkbook(write_only=True)
         ws = wb.create_sheet()
         self.prepare_xlsx_sheet(ws)
         try:
@@ -242,7 +228,7 @@ class ListExporter(BaseExporter):
                 total = line.total
                 continue
             ws.append([
-                excel_safe(val) for val in line
+                val for val in line
             ])
             if total:
                 counter += 1
@@ -347,7 +333,7 @@ class MultiSheetListExporter(ListExporter):
             return self.get_filename() + '.csv', 'text/csv', output.getvalue().encode("utf-8")
 
     def _render_xlsx(self, form_data, output_file=None):
-        wb = Workbook(write_only=True)
+        wb = SafeWorkbook(write_only=True)
         n_sheets = len(self.sheets)
         for i_sheet, (s, l) in enumerate(self.sheets):
             ws = wb.create_sheet(str(l))
@@ -361,8 +347,7 @@ class MultiSheetListExporter(ListExporter):
                     total = line.total
                     continue
                 ws.append([
-                    excel_safe(val)
+                    val for val in line
-                    for val in line
                 ])
                 if total:
                     counter += 1

src/pretix/base/exporters/__init__.py

@@ -21,6 +21,7 @@
 #
 from .answers import *  # noqa
 from .dekodi import *  # noqa
+from .events import *  # noqa
 from .invoices import *  # noqa
 from .json import *  # noqa
 from .mail import *  # noqa

src/pretix/base/exporters/events.py

@@ -0,0 +1,100 @@
+#
+# 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/>.
+#
+
+# 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.
+
+from django.dispatch import receiver
+from django.utils.formats import date_format
+from django.utils.functional import cached_property
+from django.utils.translation import gettext_lazy as _
+
+from ...control.forms.filter import get_all_payment_providers
+from ..exporter import ListExporter
+from ..signals import register_multievent_data_exporters
+
+
+class EventDataExporter(ListExporter):
+    identifier = 'eventdata'
+    verbose_name = _('Event data')
+
+    @cached_property
+    def providers(self):
+        return dict(get_all_payment_providers())
+
+    def iterate_list(self, form_data):
+        header = [
+            _("Event name"),
+            _("Short form"),
+            _("Shop is live"),
+            _("Event currency"),
+            _("Event start time"),
+            _("Event end time"),
+            _("Admission time"),
+            _("Start of presale"),
+            _("End of presale"),
+            _("Location"),
+            _("Latitude"),
+            _("Longitude"),
+            _("Internal comment"),
+        ]
+        props = list(self.organizer.meta_properties.all())
+        for p in props:
+            header.append(p.name)
+        yield header
+
+        for e in self.events.all():
+            m = e.meta_data
+            yield [
+                str(e.name),
+                e.slug,
+                _('Yes') if e.live else _('No'),
+                e.currency,
+                date_format(e.date_from, 'SHORT_DATETIME_FORMAT'),
+                date_format(e.date_to, 'SHORT_DATETIME_FORMAT') if e.date_to else '',
+                date_format(e.date_admission, 'SHORT_DATETIME_FORMAT') if e.date_admission else '',
+                date_format(e.presale_start, 'SHORT_DATETIME_FORMAT') if e.presale_start else '',
+                date_format(e.presale_end, 'SHORT_DATETIME_FORMAT') if e.presale_end else '',
+                str(e.location),
+                e.geo_lat or '',
+                e.geo_lon or '',
+                e.comment,
+            ] + [
+                m.get(p.name, '') for p in props
+            ]
+
+    def get_filename(self):
+        return '{}_events'.format(self.events.first().organizer.slug)
+
+
+@receiver(register_multievent_data_exporters, dispatch_uid="multiexporter_eventdata")
+def register_multievent_eventdata_exporter(sender, **kwargs):
+    return EventDataExporter

src/pretix/base/exporters/orderlist.py

@@ -573,6 +573,7 @@ class OrderListExporter(MultiSheetListExporter):
             pgettext('address', 'State'),
             _('Voucher'),
             _('Pseudonymization ID'),
+            _('Ticket secret'),
             _('Seat ID'),
             _('Seat name'),
             _('Seat zone'),
@@ -669,6 +670,7 @@ class OrderListExporter(MultiSheetListExporter):
                     op.state or '',
                     op.voucher.code if op.voucher else '',
                     op.pseudonymization_id,
+                    op.secret,
                 ]
 
                 if op.seat:

src/pretix/base/forms/__init__.py

@@ -38,6 +38,7 @@ import i18nfield.forms
 from django import forms
 from django.forms.models import ModelFormMetaclass
 from django.utils.crypto import get_random_string
+from django.utils.translation import gettext_lazy as _
 from formtools.wizard.views import SessionWizardView
 from hierarkey.forms import HierarkeyForm
 
@@ -112,12 +113,42 @@ class SettingsForm(i18nfield.forms.I18nFormMixin, HierarkeyForm):
             if isinstance(f, (RelativeDateTimeField, RelativeDateField)):
                 f.set_event(self.obj)
 
-    def save(self):
+    def _unmask_secret_fields(self):
         for k, v in self.cleaned_data.items():
             if isinstance(self.fields.get(k), SecretKeySettingsField) and self.cleaned_data.get(k) == SECRET_REDACTED:
                 self.cleaned_data[k] = self.initial[k]
+
+    def save(self):
+        self._unmask_secret_fields()
         return super().save()
 
+    def clean(self):
+        d = super().clean()
+
+        # There is logic in HierarkeyForm.save() to only persist fields that changed. HierarkeyForm determines if
+        # something changed by comparing `self._s.get(name)` to `value`. This leaves an edge case open for multi-lingual
+        # text fields. On the very first load, the initial value in `self._s.get(name)` will be a LazyGettextProxy-based
+        # string. However, only some of the languages are usually visible, so even if the user does not change anything
+        # at all, it will be considered a changed value and stored. We do not want that, as it makes it very hard to add
+        # languages to an organizer/event later on. So we trick it and make sure nothing gets changed in that situation.
+        for name, field in self.fields.items():
+            if isinstance(field, SecretKeySettingsField) and d.get(name) == SECRET_REDACTED and not self.initial.get(name):
+                self.add_error(
+                    name,
+                    _('Due to technical reasons you cannot set inputs, that need to be masked (e.g. passwords), to %(value)s.') % {'value': SECRET_REDACTED}
+                )
+
+            if isinstance(field, i18nfield.forms.I18nFormField):
+                value = d.get(name)
+                if not value:
+                    continue
+
+                current = self._s.get(name, as_type=type(value))
+                if name not in self.changed_data:
+                    d[name] = current
+
+        return d
+
     def get_new_filename(self, name: str) -> str:
         from pretix.base.models import Event
 

src/pretix/base/forms/auth.py

@@ -154,6 +154,7 @@ class RegistrationForm(forms.Form):
         widget=forms.PasswordInput(attrs={
             'autocomplete': 'new-password'  # see https://bugs.chromium.org/p/chromium/issues/detail?id=370363#c7
         }),
+        max_length=4096,
         required=True
     )
     password_repeat = forms.CharField(
@@ -161,6 +162,7 @@ class RegistrationForm(forms.Form):
         widget=forms.PasswordInput(attrs={
             'autocomplete': 'new-password'  # see https://bugs.chromium.org/p/chromium/issues/detail?id=370363#c7
         }),
+        max_length=4096,
         required=True
     )
     keep_logged_in = forms.BooleanField(label=_("Keep me logged in"), required=False)
@@ -204,11 +206,13 @@ class PasswordRecoverForm(forms.Form):
     password = forms.CharField(
         label=_('Password'),
         widget=forms.PasswordInput,
+        max_length=4096,
         required=True
     )
     password_repeat = forms.CharField(
         label=_('Repeat password'),
-        widget=forms.PasswordInput
+        widget=forms.PasswordInput,
+        max_length=4096,
     )
 
     def __init__(self, user_id=None, *args, **kwargs):

src/pretix/base/forms/questions.py

@@ -41,16 +41,16 @@ from io import BytesIO
 import dateutil.parser
 import pycountry
 import pytz
-from babel import Locale
 from django import forms
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import ValidationError
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.core.validators import MaxValueValidator, MinValueValidator
+from django.core.validators import (
+    MaxValueValidator, MinValueValidator, RegexValidator,
+)
 from django.db.models import QuerySet
 from django.forms import Select, widgets
-from django.utils import translation
 from django.utils.formats import date_format
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
@@ -85,7 +85,9 @@ from pretix.base.templatetags.rich_text import rich_text
 from pretix.control.forms import (
     ExtFileField, ExtValidationMixin, SizeValidationMixin, SplitDateTimeField,
 )
-from pretix.helpers.countries import CachedCountries
+from pretix.helpers.countries import (
+    CachedCountries, get_phone_prefixes_sorted_and_localized,
+)
 from pretix.helpers.escapejson import escapejson_attr
 from pretix.helpers.i18n import get_format_without_seconds
 from pretix.presale.signals import question_form_fields
@@ -187,6 +189,15 @@ class NamePartsFormField(forms.MultiValueField):
         defaults = {
             'widget': self.widget,
             'max_length': kwargs.pop('max_length', None),
+            'validators': [
+                RegexValidator(
+                    # The following characters should never appear in a name anywhere of
+                    # the world. However, they commonly appear in inputs generated by spam
+                    # bots.
+                    r'^[^$€/%§{}<>~]*$',
+                    message=_('Please do not use special characters in names.')
+                )
+            ]
         }
         self.scheme_name = kwargs.pop('scheme')
         self.titles = kwargs.pop('titles')
@@ -207,6 +218,7 @@ class NamePartsFormField(forms.MultiValueField):
             if fname == 'title' and self.scheme_titles:
                 d = dict(defaults)
                 d.pop('max_length', None)
+                d.pop('validators', None)
                 field = forms.ChoiceField(
                     **d,
                     choices=[('', '')] + [(d, d) for d in self.scheme_titles[1]]
@@ -215,6 +227,7 @@ class NamePartsFormField(forms.MultiValueField):
             elif fname == 'salutation':
                 d = dict(defaults)
                 d.pop('max_length', None)
+                d.pop('validators', None)
                 field = forms.ChoiceField(
                     **d,
                     choices=[('', '---')] + PERSON_NAME_SALUTATIONS
@@ -251,17 +264,14 @@ class WrappedPhonePrefixSelect(Select):
 
     def __init__(self, initial=None):
         choices = [("", "---------")]
-        language = get_babel_locale()  # changed from default implementation that used the django locale
+
-        locale = Locale(translation.to_locale(language))
+        if initial:
-        for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
+            for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
-            prefix = "+%d" % prefix
+                if initial in values:
-            if initial and initial in values:
+                    self.initial = "+%d" % prefix
-                self.initial = prefix
+                    break
-            for country_code in values:
+        choices += get_phone_prefixes_sorted_and_localized()
-                country_name = locale.territories.get(country_code)
+        super().__init__(choices=choices, attrs={'aria-label': pgettext_lazy('phonenumber', 'International area code')})
-                if country_name:
-                    choices.append((prefix, "{} {}".format(country_name, prefix)))
-        super().__init__(choices=sorted(choices, key=lambda item: item[1]), attrs={'aria-label': pgettext_lazy('phonenumber', 'International area code')})
 
     def render(self, name, value, *args, **kwargs):
         return super().render(name, value or self.initial, *args, **kwargs)
@@ -305,7 +315,12 @@ class WrappedPhoneNumberPrefixWidget(PhoneNumberPrefixWidget):
         silently deleting data.
         """
         if value:
-            if type(value) == PhoneNumber:
+            if isinstance(value, str):
+                try:
+                    value = PhoneNumber.from_string(value)
+                except:
+                    pass
+            if isinstance(value, PhoneNumber):
                 if value.country_code and value.national_number:
                     return [
                         "+%d" % value.country_code,
@@ -333,23 +348,41 @@ class WrappedPhoneNumberPrefixWidget(PhoneNumberPrefixWidget):
 def guess_country(event):
     # Try to guess the initial country from either the country of the merchant
     # or the locale. This will hopefully save at least some users some scrolling :)
-    locale = get_language_without_region()
     country = event.settings.region or event.settings.invoice_address_from_country
     if not country:
-        valid_countries = countries.countries
+        country = get_country_by_locale(get_language_without_region())
-        if '-' in locale:
-            parts = locale.split('-')
-            # TODO: does this actually work?
-            if parts[1].upper() in valid_countries:
-                country = Country(parts[1].upper())
-            elif parts[0].upper() in valid_countries:
-                country = Country(parts[0].upper())
-        else:
-            if locale.upper() in valid_countries:
-                country = Country(locale.upper())
     return country
 
 
+def get_country_by_locale(locale):
+    country = None
+    valid_countries = countries.countries
+    if '-' in locale:
+        parts = locale.split('-')
+        # TODO: does this actually work?
+        if parts[1].upper() in valid_countries:
+            country = Country(parts[1].upper())
+        elif parts[0].upper() in valid_countries:
+            country = Country(parts[0].upper())
+    else:
+        if locale.upper() in valid_countries:
+            country = Country(locale.upper())
+    return country
+
+
+def guess_phone_prefix(event):
+    with language(get_babel_locale()):
+        country = str(guess_country(event))
+        return get_phone_prefix(country)
+
+
+def get_phone_prefix(country):
+    for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
+        if country in values:
+            return prefix
+    return None
+
+
 class QuestionCheckboxSelectMultiple(forms.CheckboxSelectMultiple):
     option_template_name = 'pretixbase/forms/widgets/checkbox_option_with_links.html'
 
@@ -674,7 +707,7 @@ class BaseQuestionsForm(forms.Form):
                     label=label, required=required,
                     min_value=q.valid_number_min or Decimal('0.00'),
                     max_value=q.valid_number_max,
-                    help_text=q.help_text,
+                    help_text=help_text,
                     initial=initial.answer if initial else None,
                 )
             elif q.type == Question.TYPE_STRING:
@@ -780,25 +813,26 @@ class BaseQuestionsForm(forms.Form):
                 if q.valid_datetime_max:
                     field.validators.append(MaxDateTimeValidator(q.valid_datetime_max))
             elif q.type == Question.TYPE_PHONENUMBER:
-                with language(get_babel_locale()):
+                if initial:
-                    default_country = guess_country(event)
-                    default_prefix = None
-                    for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
-                        if str(default_country) in values:
-                            default_prefix = prefix
                     try:
-                        initial = PhoneNumber().from_string(initial.answer) if initial else "+{}.".format(default_prefix)
+                        initial = PhoneNumber().from_string(initial.answer)
                     except NumberParseException:
                         initial = None
-                    field = PhoneNumberField(
+
-                        label=label, required=required,
+                if not initial:
-                        help_text=help_text,
+                    phone_prefix = guess_phone_prefix(event)
-                        # We now exploit an implementation detail in PhoneNumberPrefixWidget to allow us to pass just
+                    if phone_prefix:
-                        # a country code but no number as an initial value. It's a bit hacky, but should be stable for
+                        initial = "+{}.".format(phone_prefix)
-                        # the future.
+
-                        initial=initial,
+                field = PhoneNumberField(
-                        widget=WrappedPhoneNumberPrefixWidget()
+                    label=label, required=required,
-                    )
+                    help_text=help_text,
+                    # We now exploit an implementation detail in PhoneNumberPrefixWidget to allow us to pass just
+                    # a country code but no number as an initial value. It's a bit hacky, but should be stable for
+                    # the future.
+                    initial=initial,
+                    widget=WrappedPhoneNumberPrefixWidget()
+                )
             field.question = q
             if answers:
                 # Cache the answer object for later use
@@ -869,6 +903,12 @@ class BaseQuestionsForm(forms.Form):
                 if question_is_required(q) and not answer and answer != 0 and not field.errors:
                     raise ValidationError({'question_%d' % q.pk: [_('This field is required.')]})
 
+        # Strip invisible question from cleaned_data so they don't end up in the database
+        for q in question_cache.values():
+            answer = d.get('question_%d' % q.pk)
+            if q.dependency_question_id and not question_is_visible(q.dependency_question_id, q.dependency_values) and answer is not None:
+                d['question_%d' % q.pk] = None
+
         return d
 
 
@@ -1044,7 +1084,11 @@ class BaseInvoiceAddressForm(forms.ModelForm):
                 self.instance.vat_id_validated = True
                 self.instance.vat_id = normalized_id
             except VATIDFinalError as e:
-                raise ValidationError(e.message)
+                if self.all_optional:
+                    self.instance.vat_id_validated = False
+                    messages.warning(self.request, e.message)
+                else:
+                    raise ValidationError(e.message)
             except VATIDTemporaryError as e:
                 self.instance.vat_id_validated = False
                 if self.request and self.vat_warning:

src/pretix/base/forms/widgets.py

@@ -42,6 +42,24 @@ from django.utils.timezone import get_current_timezone, now
 from django.utils.translation import gettext_lazy as _
 
 
+def replace_arabic_numbers(inp):
+    if not isinstance(inp, str):
+        return inp
+    table = {
+        1632: 48,  # 0
+        1633: 49,  # 1
+        1634: 50,  # 2
+        1635: 51,  # 3
+        1636: 52,  # 4
+        1637: 53,  # 5
+        1638: 54,  # 6
+        1639: 55,  # 7
+        1640: 56,  # 8
+        1641: 57,  # 9
+    }
+    return inp.translate(table)
+
+
 class DatePickerWidget(forms.DateInput):
     def __init__(self, attrs=None, date_format=None):
         attrs = attrs or {}
@@ -62,6 +80,10 @@ class DatePickerWidget(forms.DateInput):
 
         forms.DateInput.__init__(self, date_attrs, date_format)
 
+    def value_from_datadict(self, data, files, name):
+        v = super().value_from_datadict(data, files, name)
+        return replace_arabic_numbers(v)
+
 
 class TimePickerWidget(forms.TimeInput):
     def __init__(self, attrs=None, time_format=None):
@@ -83,17 +105,13 @@ class TimePickerWidget(forms.TimeInput):
 
         forms.TimeInput.__init__(self, time_attrs, time_format)
 
+    def value_from_datadict(self, data, files, name):
+        v = super().value_from_datadict(data, files, name)
+        return replace_arabic_numbers(v)
+
 
 class UploadedFileWidget(forms.ClearableFileInput):
     def __init__(self, *args, **kwargs):
-        # Browsers can't recognize that the server already has a file uploaded
-        # Don't mark this input as being required if we already have an answer
-        # (this needs to be done via the attrs, otherwise we wouldn't get the "required" star on the field label)
-        attrs = kwargs.get('attrs', {})
-        if kwargs.get('required') and kwargs.get('initial'):
-            attrs.update({'required': None})
-        kwargs.update({'attrs': attrs})
-
         self.position = kwargs.pop('position')
         self.event = kwargs.pop('event')
         self.answer = kwargs.pop('answer')
@@ -125,6 +143,15 @@ class UploadedFileWidget(forms.ClearableFileInput):
                     'answer': self.answer.pk,
                 })
 
+    def get_context(self, name, value, attrs):
+        # Browsers can't recognize that the server already has a file uploaded
+        # Don't mark this input as being required if we already have an answer
+        # (this needs to be done via the attrs, otherwise we wouldn't get the "required" star on the field label)
+        ctx = super().get_context(name, value, attrs)
+        if ctx['widget']['is_initial']:
+            ctx['widget']['attrs']['required'] = False
+        return ctx
+
     def format_value(self, value):
         if self.is_initial(value):
             return self.FakeFile(value, self.position, self.event, self.answer)
@@ -178,6 +205,10 @@ class SplitDateTimePickerWidget(forms.SplitDateTimeWidget):
         # Skip one hierarchy level
         forms.MultiWidget.__init__(self, widgets, attrs)
 
+    def value_from_datadict(self, data, files, name):
+        v = super().value_from_datadict(data, files, name)
+        return [replace_arabic_numbers(i) for i in v]
+
 
 class BusinessBooleanRadio(forms.RadioSelect):
     def __init__(self, require_business=False, attrs=None):

src/pretix/base/management/commands/check_order_transactions.py

@@ -23,7 +23,9 @@ from decimal import Decimal
 
 from django.core.management.base import BaseCommand
 from django.db import models
-from django.db.models import Case, F, OuterRef, Q, Subquery, Sum, Value, When
+from django.db.models import (
+    Case, Count, F, OuterRef, Q, Subquery, Sum, Value, When,
+)
 from django.db.models.functions import Coalesce
 from django_scopes import scopes_disabled
 
@@ -45,6 +47,18 @@ class Command(BaseCommand):
                     output_field=models.DecimalField(decimal_places=2, max_digits=10)
                 ), Value(0), output_field=models.DecimalField(decimal_places=2, max_digits=10)
             ),
+            position_cnt=Case(
+                When(Q(status__in=('e', 'c')) | Q(require_approval=True), then=Value(0)),
+                default=Coalesce(
+                    Subquery(
+                        OrderPosition.objects.filter(
+                            order=OuterRef('pk')
+                        ).order_by().values('order').annotate(p=Count('*')).values('p'),
+                        output_field=models.IntegerField()
+                    ), Value(0), output_field=models.IntegerField()
+                ),
+                output_field=models.IntegerField()
+            ),
             fee_total=Coalesce(
                 Subquery(
                     OrderFee.objects.filter(
@@ -61,6 +75,15 @@ class Command(BaseCommand):
                     output_field=models.DecimalField(decimal_places=2, max_digits=10)
                 ), Value(0), output_field=models.DecimalField(decimal_places=2, max_digits=10)
             ),
+            tx_cnt=Coalesce(
+                Subquery(
+                    Transaction.objects.filter(
+                        order=OuterRef('pk'),
+                        item__isnull=False,
+                    ).order_by().values('order').annotate(p=Sum(F('count'))).values('p'),
+                    output_field=models.DecimalField(decimal_places=2, max_digits=10)
+                ), Value(0), output_field=models.DecimalField(decimal_places=2, max_digits=10)
+            ),
         ).annotate(
             correct_total=Case(
                 When(Q(status=Order.STATUS_CANCELED) | Q(status=Order.STATUS_EXPIRED) | Q(require_approval=True),
@@ -70,13 +93,15 @@ class Command(BaseCommand):
             ),
         ).exclude(
             total=F('position_total') + F('fee_total'),
-            tx_total=F('correct_total')
+            tx_total=F('correct_total'),
+            tx_cnt=F('position_cnt')
         ).select_related('event')
         for o in qs:
-            if abs(o.tx_total - o.correct_total) < Decimal('0.00001') and abs(o.position_total + o.fee_total - o.total) < Decimal('0.00001'):
+            if abs(o.tx_total - o.correct_total) < Decimal('0.00001') and abs(o.position_total + o.fee_total - o.total) < Decimal('0.00001') \
+                    and o.tx_cnt == o.position_cnt:
                 # Ignore SQLite which treats Decimals like floats…
                 continue
             print(f"Error in order {o.full_code}: status={o.status}, sum(positions)+sum(fees)={o.position_total + o.fee_total}, "
-                  f"order.total={o.total}, sum(transactions)={o.tx_total}, expected={o.correct_total}")
+                  f"order.total={o.total}, sum(transactions)={o.tx_total}, expected={o.correct_total}, pos_cnt={o.position_cnt}, tx_pos_cnt={o.tx_cnt}")
 
-        self.stderr.write(self.style.SUCCESS(f'Check completed.'))
+        self.stderr.write(self.style.SUCCESS('Check completed.'))

src/pretix/base/management/commands/shell_scoped.py

@@ -19,11 +19,13 @@
 # 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 logging
 import sys
 
 from django.apps import apps
 from django.core.management import call_command
 from django.core.management.base import BaseCommand
+from django.db import connection
 from django_scopes import scope, scopes_disabled
 
 
@@ -33,6 +35,13 @@ class Command(BaseCommand):
         parser.parse_args = lambda x: parser.parse_known_args(x)[0]
         return parser
 
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--print-sql',
+            action='store_true',
+            help='Print all SQL queries.',
+        )
+
     def handle(self, *args, **options):
         try:
             from django_extensions.management.commands import shell_plus  # noqa
@@ -41,6 +50,11 @@ class Command(BaseCommand):
             cmd = 'shell'
             del options['skip_checks']
 
+        if options['print_sql']:
+            connection.force_debug_cursor = True
+            logger = logging.getLogger("django.db.backends")
+            logger.setLevel(logging.DEBUG)
+
         parser = self.create_parser(sys.argv[0], sys.argv[1])
         flags = parser.parse_known_args(sys.argv[2:])[1]
         if "--override" in flags:

src/pretix/base/migrations/0102_auto_20181017_0024.py

@@ -4,7 +4,6 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.db import migrations, models
 from django_mysql.checks import mysql_connections
-from django_mysql.utils import connection_is_mariadb
 
 
 def set_attendee_name_parts(apps, schema_editor):
@@ -31,7 +30,7 @@ def check_mysqlversion(apps, schema_editor):
     conns = list(mysql_connections())
     found = 'Unknown version'
     for alias, conn in conns:
-        if connection_is_mariadb(conn) and hasattr(conn, 'mysql_version'):
+        if hasattr(conn, 'mysql_is_mariadb') and conn.mysql_is_mariadb and hasattr(conn, 'mysql_version'):
             if conn.mysql_version >= (10, 2, 7):
                 any_conn_works = True
             else:

src/pretix/base/migrations/0205_itemvariation_require_approval.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.9 on 2021-12-13 14:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0204_orderposition_backfill_is_bundled'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='itemvariation',
+            name='require_approval',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/migrations/0206_customer_phone.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.9 on 2022-01-12 10:59
+
+import phonenumber_field.modelfields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0205_itemvariation_require_approval'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='customer',
+            name='phone',
+            field=phonenumber_field.modelfields.PhoneNumberField(max_length=128, null=True, region=None),
+        ),
+    ]

src/pretix/base/migrations/0207_auto_20220119_1427.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.4 on 2022-01-19 14:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0206_customer_phone'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='taxrule',
+            name='internal_name',
+            field=models.CharField(max_length=190, null=True),
+        ),
+        migrations.AddField(
+            model_name='taxrule',
+            name='keep_gross_if_rate_changes',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/migrations/0208_auto_20220214_1632.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.2.4 on 2022-02-14 16:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0207_auto_20220119_1427'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='auth_backend_identifier',
+            field=models.CharField(db_index=True, max_length=190, null=True),
+        ),
+        migrations.AlterUniqueTogether(
+            name='user',
+            unique_together={('auth_backend', 'auth_backend_identifier')},
+        ),
+    ]

src/pretix/base/migrations/0209_device_info.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2022-03-22 11:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0208_auto_20220214_1632'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='device',
+            name='info',
+            field=models.JSONField(null=True),
+        ),
+    ]

src/pretix/base/models/auth.py

@@ -44,7 +44,7 @@ from django.contrib.auth.models import (
 )
 from django.contrib.auth.tokens import default_token_generator
 from django.contrib.contenttypes.models import ContentType
-from django.db import models
+from django.db import IntegrityError, models, transaction
 from django.db.models import Q
 from django.utils.crypto import get_random_string, salted_hmac
 from django.utils.timezone import now
@@ -61,6 +61,10 @@ from pretix.helpers.urls import build_absolute_uri
 from .base import LoggingMixin
 
 
+class EmailAddressTakenError(IntegrityError):
+    pass
+
+
 class UserManager(BaseUserManager):
     """
     This is the user manager for our custom user model. See the User
@@ -83,6 +87,116 @@ class UserManager(BaseUserManager):
         user.save()
         return user
 
+    def get_or_create_for_backend(self, backend, identifier, email, set_always, set_on_creation):
+        """
+        This method should be used by third-party authentication backends to log in a user.
+        It either returns an already existing user or creates a new user.
+
+        In pretix 4.7 and earlier, email addresses were the only property to identify a user with.
+        Starting with pretix 4.8, backends SHOULD instead use a unique, immutable identifier
+        based on their backend data store to allow for changing email addresses.
+
+        This method transparently handles the conversion of old user accounts and adds the
+        backend identifier to their database record.
+
+        This method will never return users managed by a different authentication backend.
+        If you try to create an account with an email address already blocked by a different
+        authentication backend, :py:class:`EmailAddressTakenError` will be raised. In this case,
+        you should display a message to the user.
+
+        :param backend: The `identifier` attribute of the authentication backend
+        :param identifier: The unique, immutable identifier of this user, max. 190 characters
+        :param email: The user's email address
+        :param set_always: A dictionary of fields to update on the user model on every login
+        :param set_on_creation: A dictionary of fields to set on the user model if it's newly created
+        :return: A `User` instance.
+        """
+        if identifier is None:
+            raise ValueError('You need to supply a custom, unique identifier for this user.')
+        if email is None:
+            raise ValueError('You need to supply an email address for this user.')
+        if 'auth_backend_identifier' in set_always or 'auth_backend_identifier' in set_on_creation or \
+                'auth_backend' in set_always or 'auth_backend' in set_on_creation:
+            raise ValueError('You may not update auth_backend/auth_backend_identifier.')
+        if len(identifier) > 190:
+            raise ValueError('The user identifier must not be more than 190 characters.')
+
+        # Always update the email address
+        set_always.update({'email': email})
+
+        # First, check if we find the user based on it's backend-specific authenticator
+        try:
+            u = self.get(
+                auth_backend=backend,
+                auth_backend_identifier=identifier,
+            )
+            dirty = False
+            for k, v in set_always.items():
+                if getattr(u, k) != v:
+                    setattr(u, k, v)
+                    dirty = True
+            if dirty:
+                try:
+                    with transaction.atomic():
+                        u.save(update_fields=set_always.keys())
+                except IntegrityError:
+                    # This might only raise IntegrityError if the email address is used
+                    # by someone else
+                    raise EmailAddressTakenError()
+            return u
+        except self.model.DoesNotExist:
+            pass
+
+        # Second, check if we find the user based on their email address and this backend
+        try:
+            u = self.get(
+                auth_backend=backend,
+                auth_backend_identifier__isnull=True,
+                email=email,
+            )
+            u.auth_backend_identifier = identifier
+            for k, v in set_always.items():
+                setattr(u, k, v)
+            try:
+                with transaction.atomic():
+                    u.save(update_fields=['auth_backend_identifier'] + list(set_always.keys()))
+                return u
+            except IntegrityError:
+                # This might only raise IntegrityError if this code is being executed twice
+                # and runs into a race condition, this mechanism is taken from Django's
+                # get_or_create
+                try:
+                    return self.get(
+                        auth_backend=backend,
+                        auth_backend_identifier=identifier,
+                    )
+                except self.model.DoesNotExist:
+                    pass
+                raise
+        except self.model.DoesNotExist:
+            pass
+
+        # Third, create a new user
+        u = User(
+            auth_backend=backend,
+            auth_backend_identifier=identifier,
+            **set_on_creation,
+            **set_always,
+        )
+        try:
+            u.save(force_insert=True)
+            return u
+        except IntegrityError:
+            # This might either be a race condition or the email address is taken
+            # by a different backend
+            try:
+                return self.get(
+                    auth_backend=backend,
+                    auth_backend_identifier=identifier,
+                )
+            except self.model.DoesNotExist:
+                raise EmailAddressTakenError()
+
 
 def generate_notifications_token():
     return get_random_string(length=32)
@@ -117,6 +231,10 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
     :type needs_password_change: bool
     :param timezone: The user's preferred timezone.
     :type timezone: str
+    :param auth_backend: The identifier of the authentication backend plugin responsible for managing this user.
+    :type auth_backend: str
+    :param auth_backend_identifier: The native identifier of the user provided by a non-native authentication backend.
+    :type auth_backend_identifier: str
     """
 
     USERNAME_FIELD = 'email'
@@ -152,6 +270,7 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
     )
     notifications_token = models.CharField(max_length=255, default=generate_notifications_token)
     auth_backend = models.CharField(max_length=255, default='native')
+    auth_backend_identifier = models.CharField(max_length=190, db_index=True, null=True, blank=True)
     session_token = models.CharField(max_length=32, default=generate_session_token)
 
     objects = UserManager()
@@ -164,6 +283,7 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
         verbose_name = _("User")
         verbose_name_plural = _("Users")
         ordering = ('email',)
+        unique_together = (('auth_backend', 'auth_backend_identifier'),)
 
     def save(self, *args, **kwargs):
         self.email = self.email.lower()
@@ -378,6 +498,23 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
             | Q(id__in=self.teams.filter(**kwargs).values_list('limit_events__id', flat=True))
         )
 
+    @scopes_disabled()
+    def get_organizers_with_any_permission(self, request=None):
+        """
+        Returns a queryset of organizers the user has any permissions to.
+
+        :param request: The current request (optional). Required to detect staff sessions properly.
+        :return: Iterable of Organizers
+        """
+        from .event import Organizer
+
+        if request and self.has_active_staff_session(request.session.session_key):
+            return Organizer.objects.all()
+
+        return Organizer.objects.filter(
+            id__in=self.teams.values_list('organizer', flat=True)
+        )
+
     @scopes_disabled()
     def get_organizers_with_permission(self, permission, request=None):
         """

src/pretix/base/models/checkin.py

@@ -188,6 +188,7 @@ class CheckinList(LoggedModel):
         # * in pretix.helpers.jsonlogic_boolalg
         # * in checkinrules.js
         # * in libpretixsync
+        # * in pretixscan-ios (in the future)
         top_level_operators = {
             '<', '<=', '>', '>=', '==', '!=', 'inList', 'isBefore', 'isAfter', 'or', 'and'
         }
@@ -195,7 +196,8 @@ class CheckinList(LoggedModel):
             'buildTime', 'objectList', 'lookup', 'var',
         }
         allowed_vars = {
-            'product', 'variation', 'now', 'entries_number', 'entries_today', 'entries_days'
+            'product', 'variation', 'now', 'now_isoweekday', 'entries_number', 'entries_today', 'entries_days',
+            'minutes_since_last_entry', 'minutes_since_first_entry',
         }
         if not rules or not isinstance(rules, dict):
             return rules
@@ -221,7 +223,7 @@ class CheckinList(LoggedModel):
             return rules
 
         if operator in ('or', 'and') and seen_nonbool:
-            raise ValidationError(f'You cannot use OR/AND logic on a level below a comparison operator.')
+            raise ValidationError('You cannot use OR/AND logic on a level below a comparison operator.')
 
         for v in values:
             cls.validate_rules(v, seen_nonbool=seen_nonbool or operator not in ('or', 'and'), depth=depth + 1)

src/pretix/base/models/customers.py

@@ -29,6 +29,7 @@ from django.db.models import F, Q
 from django.utils.crypto import get_random_string, salted_hmac
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_scopes import ScopedManager, scopes_disabled
+from phonenumber_field.modelfields import PhoneNumberField
 
 from pretix.base.banlist import banned
 from pretix.base.models.base import LoggedModel
@@ -45,6 +46,7 @@ class Customer(LoggedModel):
     organizer = models.ForeignKey(Organizer, related_name='customers', on_delete=models.CASCADE)
     identifier = models.CharField(max_length=190, db_index=True, unique=True)
     email = models.EmailField(db_index=True, null=True, blank=False, verbose_name=_('E-mail'), max_length=190)
+    phone = PhoneNumberField(null=True, blank=True, verbose_name=_('Phone number'))
     password = models.CharField(verbose_name=_('Password'), max_length=128)
     name_cached = models.CharField(max_length=255, verbose_name=_('Full name'), blank=True)
     name_parts = models.JSONField(default=dict)
@@ -87,6 +89,7 @@ class Customer(LoggedModel):
         self.name_parts = {}
         self.name_cached = ''
         self.email = None
+        self.phone = None
         self.save()
         self.all_logentries().update(data={}, shredded=True)
         self.orders.all().update(customer=None)
@@ -169,6 +172,7 @@ class Customer(LoggedModel):
         return salted_hmac(key_salt, payload).hexdigest()
 
     def get_email_context(self):
+        from pretix.base.email import get_name_parts_localized
         ctx = {
             'name': self.name,
             'organizer': self.organizer.name,
@@ -177,7 +181,13 @@ class Customer(LoggedModel):
         for f, l, w in name_scheme['fields']:
             if f == 'full_name':
                 continue
-            ctx['name_%s' % f] = self.name_parts.get(f, '')
+            ctx['name_%s' % f] = get_name_parts_localized(self.name_parts, f)
+
+        if "concatenation_for_salutation" in name_scheme:
+            ctx['name_for_salutation'] = name_scheme["concatenation_for_salutation"](self.name_parts)
+        else:
+            ctx['name_for_salutation'] = name_scheme["concatenation"](self.name_parts)
+
         return ctx
 
     @property

src/pretix/base/models/devices.py

@@ -156,6 +156,9 @@ class Device(LoggedModel):
         null=True,
         blank=False
     )
+    info = models.JSONField(
+        null=True, blank=True,
+    )
 
     objects = ScopedManager(organizer='organizer')
 

src/pretix/base/models/event.py

@@ -665,21 +665,22 @@ class Event(EventMixin, LoggedModel):
 
         return locking.LockManager(self)
 
-    def get_mail_backend(self, timeout=None, force_custom=False):
+    def get_mail_backend(self, timeout=None):
         """
         Returns an email server connection, either by using the system-wide connection
         or by returning a custom one based on the event's settings.
         """
-        from pretix.base.email import CustomSMTPBackend
 
-        if self.settings.smtp_use_custom or force_custom:
+        if self.settings.smtp_use_custom:
-            return CustomSMTPBackend(host=self.settings.smtp_host,
+            return get_connection(backend=settings.EMAIL_CUSTOM_SMTP_BACKEND,
-                                     port=self.settings.smtp_port,
+                                  host=self.settings.smtp_host,
-                                     username=self.settings.smtp_username,
+                                  port=self.settings.smtp_port,
-                                     password=self.settings.smtp_password,
+                                  username=self.settings.smtp_username,
-                                     use_tls=self.settings.smtp_use_tls,
+                                  password=self.settings.smtp_password,
-                                     use_ssl=self.settings.smtp_use_ssl,
+                                  use_tls=self.settings.smtp_use_tls,
-                                     fail_silently=False, timeout=timeout)
+                                  use_ssl=self.settings.smtp_use_ssl,
+                                  fail_silently=False,
+                                  timeout=timeout)
         else:
             return get_connection(fail_silently=False)
 
@@ -1178,21 +1179,21 @@ class Event(EventMixin, LoggedModel):
             if not p.name.startswith('.') and getattr(p, 'visible', True)
         }
 
-    def set_active_plugins(self, modules, allow_restricted=False):
+    def set_active_plugins(self, modules, allow_restricted=frozenset()):
         plugins_active = self.get_plugins()
         plugins_available = self.get_available_plugins()
 
         enable = [m for m in modules if m not in plugins_active and m in plugins_available]
 
         for module in enable:
-            if getattr(plugins_available[module].app, 'restricted', False) and not allow_restricted:
+            if getattr(plugins_available[module].app, 'restricted', False) and module not in allow_restricted:
                 modules.remove(module)
             elif hasattr(plugins_available[module].app, 'installed'):
                 getattr(plugins_available[module].app, 'installed')(self)
 
         self.plugins = ",".join(modules)
 
-    def enable_plugin(self, module, allow_restricted=False):
+    def enable_plugin(self, module, allow_restricted=frozenset()):
         plugins_active = self.get_plugins()
         from pretix.presale.style import regenerate_css
 

src/pretix/base/models/fields.py

@@ -52,7 +52,10 @@ class MultiStringField(TextField):
         if isinstance(value, (list, tuple)):
             return DELIMITER + DELIMITER.join(value) + DELIMITER
         elif value is None:
-            return ""
+            if self.null:
+                return None
+            else:
+                return ""
         raise TypeError("Invalid data type passed.")
 
     def get_prep_lookup(self, lookup_type, value):  # NOQA
@@ -78,6 +81,8 @@ class MultiStringField(TextField):
             return MultiStringContains
         elif lookup_name == 'icontains':
             return MultiStringIContains
+        elif lookup_name == 'isnull':
+            return builtin_lookups.IsNull
         raise NotImplementedError(
             "Lookup '{}' doesn't work with MultiStringField".format(lookup_name),
         )

src/pretix/base/models/items.py

@@ -44,7 +44,7 @@ import dateutil.parser
 import pytz
 from django.conf import settings
 from django.core.exceptions import ValidationError
-from django.core.validators import RegexValidator
+from django.core.validators import MinValueValidator, RegexValidator
 from django.db import models
 from django.db.models import Q
 from django.utils import formats
@@ -479,12 +479,14 @@ class Item(LoggedModel):
     min_per_order = models.IntegerField(
         verbose_name=_('Minimum amount per order'),
         null=True, blank=True,
+        validators=[MinValueValidator(0)],
         help_text=_('This product can only be bought if it is added to the cart at least this many times. If you keep '
                     'the field empty or set it to 0, there is no special limit for this product.')
     )
     max_per_order = models.IntegerField(
         verbose_name=_('Maximum amount per order'),
         null=True, blank=True,
+        validators=[MinValueValidator(0)],
         help_text=_('This product can only be bought at most this many times within one order. If you keep the field '
                     'empty or set it to 0, there is no special limit for this product. The limit for the maximum '
                     'number of items in the whole order applies regardless.')
@@ -764,6 +766,9 @@ class ItemVariation(models.Model):
     :type default_price: decimal.Decimal
     :param original_price: The item's "original" price. Will not be used for any calculations, will just be shown.
     :type original_price: decimal.Decimal
+    :param require_approval: If set to ``True``, orders containing this variation can only be processed and paid after
+    approval by an administrator
+    :type require_approval: bool
     """
     item = models.ForeignKey(
         Item,
@@ -799,6 +804,13 @@ class ItemVariation(models.Model):
         help_text=_('If set, this will be displayed next to the current price to show that the current price is a '
                     'discounted one. This is just a cosmetic setting and will not actually impact pricing.')
     )
+    require_approval = models.BooleanField(
+        verbose_name=_('Require approval'),
+        default=False,
+        help_text=_('If this variation is part of an order, the order will be put into an "approval" state and '
+                    'will need to be confirmed by you before it can be paid and completed. You can use this e.g. for '
+                    'discounted tickets that are only available to specific groups.'),
+    )
     require_membership = models.BooleanField(
         verbose_name=_('Require a valid membership'),
         default=False,
@@ -832,7 +844,7 @@ class ItemVariation(models.Model):
         blank=True,
     )
     hide_without_voucher = models.BooleanField(
-        verbose_name=_('This variation will only be shown if a voucher matching the product is redeemed.'),
+        verbose_name=_('Show only if a matching voucher is redeemed.'),
         default=False,
         help_text=_('This variation will be hidden from the event page until the user enters a voucher '
                     'that unlocks this variation.')
@@ -1687,7 +1699,7 @@ class Quota(LoggedModel):
             if event != item.event:
                 raise ValidationError(_('One or more items do not belong to this event.'))
             if item.has_variations:
-                if not any(var.item == item for var in variations):
+                if not variations or not any(var.item == item for var in variations):
                     raise ValidationError(_('One or more items has variations but none of these are in the variations list.'))
 
     @staticmethod

src/pretix/base/models/orders.py

@@ -638,12 +638,13 @@ class Order(LockModel, LoggedModel):
                 return False
         if self.user_cancel_deadline and now() > self.user_cancel_deadline:
             return False
-        if self.status == Order.STATUS_PENDING:
+
-            return self.event.settings.cancel_allow_user
+        if self.status == Order.STATUS_PAID or self.payment_refund_sum > Decimal('0.00'):
-        elif self.status == Order.STATUS_PAID:
             if self.total == Decimal('0.00'):
                 return self.event.settings.cancel_allow_user
             return self.event.settings.cancel_allow_user_paid
+        elif self.status == Order.STATUS_PENDING:
+            return self.event.settings.cancel_allow_user
         return False
 
     def propose_auto_refunds(self, amount: Decimal, payments: list=None):
@@ -950,7 +951,7 @@ class Order(LockModel, LoggedModel):
                   context: Dict[str, Any]=None, log_entry_type: str='pretix.event.order.email.sent',
                   user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
                   auth=None, attach_tickets=False, position: 'OrderPosition'=None, auto_email=True,
-                  attach_ical=False):
+                  attach_ical=False, attach_other_files: list=None):
         """
         Sends an email to the user that placed this order. Basically, this method does two things:
 
@@ -976,7 +977,7 @@ class Order(LockModel, LoggedModel):
             SendMailException, TolerantDict, mail, render_mail,
         )
 
-        if not self.email:
+        if not self.email and not (position and position.attendee_email):
             return
 
         for k, v in self.event.meta_data.items():
@@ -994,7 +995,8 @@ class Order(LockModel, LoggedModel):
                     recipient, subject, template, context,
                     self.event, self.locale, self, headers=headers, sender=sender,
                     invoices=invoices, attach_tickets=attach_tickets,
-                    position=position, auto_email=auto_email, attach_ical=attach_ical
+                    position=position, auto_email=auto_email, attach_ical=attach_ical,
+                    attach_other_files=attach_other_files,
                 )
             except SendMailException:
                 raise
@@ -1329,6 +1331,10 @@ class AbstractPosition(models.Model):
         else:
             return {}
 
+    @property
+    def item_and_variation(self):
+        return self.item, self.variation
+
     @meta_info_data.setter
     def meta_info_data(self, d):
         self.meta_info = json.dumps(d)
@@ -1441,6 +1447,15 @@ class AbstractPosition(models.Model):
         lines = [r.strip() for r in lines if r]
         return '\n'.join(lines).strip()
 
+    def requires_approval(self, invoice_address=None):
+        if self.item.require_approval:
+            return True
+        if self.variation and self.variation.require_approval:
+            return True
+        if self.item.tax_rule and self.item.tax_rule._require_approval(invoice_address):
+            return True
+        return False
+
 
 class OrderPayment(models.Model):
     """
@@ -1714,10 +1729,10 @@ class OrderPayment(models.Model):
             email_context = get_email_context(event=self.order.event, order=self.order, position=position)
             email_subject = _('Event registration confirmed: %(code)s') % {'code': self.order.code}
             try:
-                self.order.send_mail(
+                position.send_mail(
                     email_subject, email_template, email_context,
                     'pretix.event.order.email.order_paid', user,
-                    invoices=[], position=position,
+                    invoices=[],
                     attach_tickets=True,
                     attach_ical=self.order.event.settings.mail_attach_ical
                 )
@@ -2316,7 +2331,7 @@ class OrderPosition(AbstractPosition):
     def send_mail(self, subject: str, template: Union[str, LazyI18nString],
                   context: Dict[str, Any]=None, log_entry_type: str='pretix.event.order.email.sent',
                   user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
-                  auth=None, attach_tickets=False, attach_ical=False):
+                  auth=None, attach_tickets=False, attach_ical=False, attach_other_files: list=None):
         """
         Sends an email to the attendee. Basically, this method does two things:
 
@@ -2357,6 +2372,7 @@ class OrderPosition(AbstractPosition):
                     invoices=invoices,
                     attach_tickets=attach_tickets,
                     attach_ical=attach_ical,
+                    attach_other_files=attach_other_files,
                 )
             except SendMailException:
                 raise

src/pretix/base/models/organizer.py

@@ -36,6 +36,7 @@ import string
 from datetime import date, datetime, time
 
 import pytz
+from django.conf import settings
 from django.core.mail import get_connection
 from django.core.validators import MinLengthValidator, RegexValidator
 from django.db import models
@@ -97,10 +98,21 @@ class Organizer(LoggedModel):
         return self.name
 
     def save(self, *args, **kwargs):
+        is_new = not self.pk
         obj = super().save(*args, **kwargs)
-        self.get_cache().clear()
+        if is_new:
+            self.set_defaults()
+        else:
+            self.get_cache().clear()
         return obj
 
+    def set_defaults(self):
+        """
+        This will be called after organizer creation.
+        This way, we can use this to introduce new default settings to pretix that do not affect existing organizers.
+        """
+        self.settings.cookie_consent = True
+
     def get_cache(self):
         """
         Returns an :py:class:`ObjectRelatedCache` object. This behaves equivalent to
@@ -179,21 +191,20 @@ class Organizer(LoggedModel):
             e.delete()
         self.teams.all().delete()
 
-    def get_mail_backend(self, timeout=None, force_custom=False):
+    def get_mail_backend(self, timeout=None):
         """
         Returns an email server connection, either by using the system-wide connection
         or by returning a custom one based on the organizer's settings.
         """
-        from pretix.base.email import CustomSMTPBackend
+        if self.settings.smtp_use_custom:
-
+            return get_connection(backend=settings.EMAIL_CUSTOM_SMTP_BACKEND,
-        if self.settings.smtp_use_custom or force_custom:
+                                  host=self.settings.smtp_host,
-            return CustomSMTPBackend(host=self.settings.smtp_host,
+                                  port=self.settings.smtp_port,
-                                     port=self.settings.smtp_port,
+                                  username=self.settings.smtp_username,
-                                     username=self.settings.smtp_username,
+                                  password=self.settings.smtp_password,
-                                     password=self.settings.smtp_password,
+                                  use_tls=self.settings.smtp_use_tls,
-                                     use_tls=self.settings.smtp_use_tls,
+                                  use_ssl=self.settings.smtp_use_ssl,
-                                     use_ssl=self.settings.smtp_use_ssl,
+                                  fail_silently=False, timeout=timeout)
-                                     fail_silently=False, timeout=timeout)
         else:
             return get_connection(fail_silently=False)
 

src/pretix/base/models/seating.py

@@ -26,7 +26,7 @@ import jsonschema
 from django.contrib.staticfiles import finders
 from django.core.exceptions import ValidationError
 from django.db import models
-from django.db.models import Exists, F, OuterRef, Q, Value
+from django.db.models import Exists, F, OuterRef, Q, Subquery, Value
 from django.db.models.functions import Power
 from django.utils.deconstruct import deconstructible
 from django.utils.timezone import now
@@ -281,10 +281,26 @@ class Seat(models.Model):
             q = Q(has_order=True) | Q(has_voucher=True)
             if ignore_cart is not True:
                 q |= Q(has_cart=True)
+
+            # The following looks like it makes no sense. Why wouldn't we just use ``Value(self.x)``, we already now
+            # the value? The reason is that x and y are floating point values generated from our JSON files. As it turns
+            # out, PostgreSQL MIGHT store floating point values with a different precision based on the underlying system
+            # architecture. So if we generate e.g. 670.247128887222289 from the JSON file and store it to the database,
+            # PostgreSQL will store it as 670.247128887222289 internally. However if we query it again, we only get
+            # 670.247128887222 back. But if we do calculations with a field in PostgreSQL itself, it uses the full
+            # precision for the calculation.
+            # We don't actually care about the results with this precision, but we care that the results from this
+            # function are exactly the same as from event.free_seats(), so we do this subquery trick to deal with
+            # PostgreSQL's internal values in both cases.
+            # In the long run, we probably just want to round the numbers on insert...
+            # See also https://www.postgresql.org/docs/11/runtime-config-client.html#GUC-EXTRA-FLOAT-DIGITS
+            self_x = Subquery(Seat.objects.filter(pk=self.pk).values('x'))
+            self_y = Subquery(Seat.objects.filter(pk=self.pk).values('y'))
+
             qs_closeby_taken = qs_annotated.annotate(
                 distance=(
-                    Power(F('x') - Value(self.x), Value(2), output_field=models.FloatField()) +
+                    Power(F('x') - self_x, Value(2), output_field=models.FloatField()) +
-                    Power(F('y') - Value(self.y), Value(2), output_field=models.FloatField())
+                    Power(F('y') - self_y, Value(2), output_field=models.FloatField())
                 )
             ).exclude(pk=self.pk).filter(
                 q,

src/pretix/base/models/tax.py

@@ -81,6 +81,15 @@ class TaxedPrice:
             name=self.name,
         )
 
+    def __eq__(self, other):
+        return (
+            self.gross == other.gross and
+            self.net == other.net and
+            self.tax == other.tax and
+            self.rate == other.rate and
+            self.name == other.name
+        )
+
 
 TAXED_ZERO = TaxedPrice(
     gross=Decimal('0.00'),
@@ -127,8 +136,13 @@ def cc_to_vat_prefix(country_code):
 
 class TaxRule(LoggedModel):
     event = models.ForeignKey('Event', related_name='tax_rules', on_delete=models.CASCADE)
+    internal_name = models.CharField(
+        verbose_name=_('Internal name'),
+        max_length=190,
+        null=True, blank=True,
+    )
     name = I18nCharField(
-        verbose_name=_('Name'),
+        verbose_name=_('Official name'),
         help_text=_('Should be short, e.g. "VAT"'),
         max_length=190,
     )
@@ -141,6 +155,10 @@ class TaxRule(LoggedModel):
         verbose_name=_("The configured product prices include the tax amount"),
         default=True,
     )
+    keep_gross_if_rate_changes = models.BooleanField(
+        verbose_name=_("Keep gross amount constant if the tax rate changes based on the invoice address"),
+        default=False,
+    )
     eu_reverse_charge = models.BooleanField(
         verbose_name=_("Use EU reverse charge taxation rules"),
         default=False,
@@ -198,6 +216,8 @@ class TaxRule(LoggedModel):
             s = _('plus {rate}% {name}').format(rate=self.rate, name=self.name)
         if self.eu_reverse_charge:
             s += ' ({})'.format(_('reverse charge enabled'))
+        if self.internal_name:
+            return f'{self.internal_name} ({s})'
         return str(s)
 
     @property
@@ -211,7 +231,7 @@ class TaxRule(LoggedModel):
             rule = self.get_matching_rule(invoice_address)
             if rule.get('action', 'vat') == 'block':
                 raise self.SaleNotAllowed()
-            if rule.get('action', 'vat') == 'vat' and rule.get('rate') is not None:
+            if rule.get('action', 'vat') in ('vat', 'require_approval') and rule.get('rate') is not None:
                 return Decimal(rule.get('rate'))
         return Decimal(self.rate)
 
@@ -228,13 +248,19 @@ class TaxRule(LoggedModel):
             rate = override_tax_rate
         elif invoice_address:
             adjust_rate = self.tax_rate_for(invoice_address)
-            if (adjust_rate == gross_price_is_tax_rate or force_fixed_gross_price) and base_price_is == 'gross':
+            if (adjust_rate == gross_price_is_tax_rate or force_fixed_gross_price or self.keep_gross_if_rate_changes) and base_price_is == 'gross':
                 rate = adjust_rate
             elif adjust_rate != rate:
-                normal_price = self.tax(base_price, base_price_is, currency, subtract_from_gross=subtract_from_gross)
+                if self.keep_gross_if_rate_changes:
-                base_price = normal_price.net
+                    normal_price = self.tax(base_price, base_price_is, currency, subtract_from_gross=subtract_from_gross)
-                base_price_is = 'net'
+                    base_price = normal_price.gross
-                subtract_from_gross = Decimal('0.00')
+                    base_price_is = 'gross'
+                    subtract_from_gross = Decimal('0.00')
+                else:
+                    normal_price = self.tax(base_price, base_price_is, currency, subtract_from_gross=subtract_from_gross)
+                    base_price = normal_price.net
+                    base_price_is = 'net'
+                    subtract_from_gross = Decimal('0.00')
                 rate = adjust_rate
 
         if rate == Decimal('0.00'):
@@ -337,12 +363,19 @@ class TaxRule(LoggedModel):
 
         return False
 
+    def _require_approval(self, invoice_address):
+        if self._custom_rules:
+            rule = self.get_matching_rule(invoice_address)
+            if rule.get('action', 'vat') == 'require_approval':
+                return True
+        return False
+
     def _tax_applicable(self, invoice_address):
         if self._custom_rules:
             rule = self.get_matching_rule(invoice_address)
             if rule.get('action', 'vat') == 'block':
                 raise self.SaleNotAllowed()
-            return rule.get('action', 'vat') == 'vat'
+            return rule.get('action', 'vat') in ('vat', 'require_approval')
 
         if not self.eu_reverse_charge:
             # No reverse charge rules? Always apply VAT!

src/pretix/base/payment.py

@@ -191,6 +191,15 @@ class BasePaymentProvider:
         """
         return self.verbose_name
 
+    @property
+    def confirm_button_name(self) -> str:
+        """
+        A label for the "confirm" button on the last page before a payment is started. This
+        is **not** used in the regular checkout flow, but only if the payment method is selected
+        for an existing order later on.
+        """
+        return _("Pay now")
+
     @property
     def identifier(self) -> str:
         """
@@ -946,6 +955,8 @@ class BoxOfficeProvider(BasePaymentProvider):
         return {
             "pos_id": payment.info_data.get('pos_id', None),
             "receipt_id": payment.info_data.get('receipt_id', None),
+            "payment_type": payment.info_data.get('payment_type', None),
+            "payment_data": payment.info_data.get('payment_data', {}),
         }
 
     def payment_control_render(self, request, payment) -> str:

src/pretix/base/pdf.py

@@ -37,6 +37,7 @@ import hashlib
 import itertools
 import logging
 import os
+import re
 import subprocess
 import tempfile
 import uuid
@@ -48,12 +49,14 @@ from arabic_reshaper import ArabicReshaper
 from bidi.algorithm import get_display
 from django.conf import settings
 from django.contrib.staticfiles import finders
+from django.db.models import Max, Min
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.functional import SimpleLazyObject
 from django.utils.html import conditional_escape
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _
+from i18nfield.strings import LazyI18nString
 from PyPDF2 import PdfFileReader
 from pytz import timezone
 from reportlab.graphics import renderPDF
@@ -202,6 +205,11 @@ DEFAULT_VARIABLES = OrderedDict((
         "editor_sample": 'foo@bar.com',
         "evaluate": lambda op, order, ev: op.attendee_email or (op.addon_to.attendee_email if op.addon_to else '')
     }),
+    ("pseudonymization_id", {
+        "label": _("Pseudonymization ID (lead scanning)"),
+        "editor_sample": "GG89JUJDTA",
+        "evaluate": lambda orderposition, order, event: orderposition.pseudonymization_id,
+    }),
     ("event_name", {
         "label": _("Event name"),
         "editor_sample": _("Sample event name"),
@@ -387,30 +395,41 @@ DEFAULT_VARIABLES = OrderedDict((
     ("seat", {
         "label": _("Seat: Full name"),
         "editor_sample": _("Ground floor, Row 3, Seat 4"),
-        "evaluate": lambda op, order, ev: str(op.seat if op.seat else
+        "evaluate": lambda op, order, ev: str(get_seat(op) if get_seat(op) else
                                               _('General admission') if ev.seating_plan_id is not None else "")
     }),
     ("seat_zone", {
         "label": _("Seat: zone"),
         "editor_sample": _("Ground floor"),
-        "evaluate": lambda op, order, ev: str(op.seat.zone_name if op.seat else
+        "evaluate": lambda op, order, ev: str(get_seat(op).zone_name if get_seat(op) else
                                               _('General admission') if ev.seating_plan_id is not None else "")
     }),
     ("seat_row", {
         "label": _("Seat: row"),
         "editor_sample": "3",
-        "evaluate": lambda op, order, ev: str(op.seat.row_name if op.seat else "")
+        "evaluate": lambda op, order, ev: str(get_seat(op).row_name if get_seat(op) else "")
     }),
     ("seat_number", {
         "label": _("Seat: seat number"),
         "editor_sample": 4,
-        "evaluate": lambda op, order, ev: str(op.seat.seat_number if op.seat else "")
+        "evaluate": lambda op, order, ev: str(get_seat(op).seat_number if get_seat(op) else "")
     }),
     ("first_scan", {
         "label": _("Date and time of first scan"),
         "editor_sample": _("2017-05-31 19:00"),
         "evaluate": lambda op, order, ev: get_first_scan(op)
     }),
+    ("giftcard_issuance_date", {
+
+        "label": _("Gift card: Issuance date"),
+        "editor_sample": _("2017-05-31"),
+        "evaluate": lambda op, order, ev: get_giftcard_issuance(op, ev)
+    }),
+    ("giftcard_expiry_date", {
+        "label": _("Gift card: Expiration date"),
+        "editor_sample": _("2017-05-31"),
+        "evaluate": lambda op, order, ev: get_giftcard_expiry(op, ev)
+    }),
 ))
 DEFAULT_IMAGES = OrderedDict([])
 
@@ -485,10 +504,17 @@ def variables_from_questions(sender, *args, **kwargs):
     for q in sender.questions.all():
         if q.type == Question.TYPE_FILE:
             continue
+        d['question_{}'.format(q.identifier)] = {
+            'label': _('Question: {question}').format(question=q.question),
+            'editor_sample': _('<Answer: {question}>').format(question=q.question),
+            'evaluate': partial(get_answer, question_id=q.pk),
+            'migrate_from': 'question_{}'.format(q.pk)
+        }
         d['question_{}'.format(q.pk)] = {
             'label': _('Question: {question}').format(question=q.question),
             'editor_sample': _('<Answer: {question}>').format(question=q.question),
-            'evaluate': partial(get_answer, question_id=q.pk)
+            'evaluate': partial(get_answer, question_id=q.pk),
+            'hidden': True,
         }
     return d
 
@@ -546,6 +572,24 @@ def get_variables(event):
     return v
 
 
+def get_giftcard_expiry(op: OrderPosition, ev):
+    if not op.item.issue_giftcard:
+        return ""  # performance optimization
+    m = op.issued_gift_cards.aggregate(m=Min('expires'))['m']
+    if not m:
+        return ""
+    return date_format(m.astimezone(ev.timezone), "SHORT_DATE_FORMAT")
+
+
+def get_giftcard_issuance(op: OrderPosition, ev):
+    if not op.item.issue_giftcard:
+        return ""  # performance optimization
+    m = op.issued_gift_cards.aggregate(m=Max('issuance'))['m']
+    if not m:
+        return ""
+    return date_format(m.astimezone(ev.timezone), "SHORT_DATE_FORMAT")
+
+
 def get_first_scan(op: OrderPosition):
     scans = list(op.checkins.all())
 
@@ -557,6 +601,14 @@ def get_first_scan(op: OrderPosition):
     return ""
 
 
+def get_seat(op: OrderPosition):
+    if op.seat_id:
+        return op.seat
+    if op.addon_to_id:
+        return op.addon_to.seat
+    return None
+
+
 reshaper = SimpleLazyObject(lambda: ArabicReshaper(configuration={
     'delete_harakat': True,
     'support_ligatures': False,
@@ -616,12 +668,14 @@ class Renderer:
                          preserveAspectRatio=True, anchor='n',
                          mask='auto')
 
-    def _draw_barcodearea(self, canvas: Canvas, op: OrderPosition, o: dict):
+    def _draw_barcodearea(self, canvas: Canvas, op: OrderPosition, order: Order, o: dict):
         content = o.get('content', 'secret')
         if content == 'secret':
+            # do not use get_text_content because it uses a shortened version of secret
+            # and does not deal with our default value here properly
             content = op.secret
-        elif content == 'pseudonymization_id':
+        else:
-            content = op.pseudonymization_id
+            content = self._get_text_content(op, order, o)
 
         level = 'H'
         if len(content) > 32:
@@ -648,20 +702,51 @@ class Renderer:
                 return self._get_text_content(op, order, o, True)
 
         ev = self._get_ev(op, order)
+
         if not o['content']:
             return '(error)'
-        if o['content'] == 'other':
+
-            return o['text']
+        if o['content'] == 'other' or o['content'] == 'other_i18n':
+            if o['content'] == 'other_i18n':
+                text = str(LazyI18nString(o['text_i18n']))
+            else:
+                text = o['text']
+
+            def replace(x):
+                print(x.group(1))
+                if x.group(1).startswith('itemmeta:'):
+                    return op.item.meta_data.get(x.group(1)[9:]) or ''
+                elif x.group(1).startswith('meta:'):
+                    return ev.meta_data.get(x.group(1)[5:]) or ''
+                elif x.group(1) not in self.variables:
+                    return x.group(0)
+                if x.group(1) == 'secret':
+                    # Do not use shortened version
+                    return op.secret
+
+                try:
+                    return self.variables[x.group(1)]['evaluate'](op, order, ev)
+                except:
+                    logger.exception('Failed to process variable.')
+                    return '(error)'
+
+            # We do not use str.format like in emails so we (a) can evaluate lazily and (b) can re-implement this
+            # 1:1 on other platforms that render PDFs through our API (libpretixprint)
+            return re.sub(r'\{([a-zA-Z0-9:_]+)\}', replace, text)
+
         elif o['content'].startswith('itemmeta:'):
             return op.item.meta_data.get(o['content'][9:]) or ''
+
         elif o['content'].startswith('meta:'):
             return ev.meta_data.get(o['content'][5:]) or ''
+
         elif o['content'] in self.variables:
             try:
                 return self.variables[o['content']]['evaluate'](op, order, ev)
             except:
                 logger.exception('Failed to process variable.')
                 return '(error)'
+
         return ''
 
     def _draw_imagearea(self, canvas: Canvas, op: OrderPosition, order: Order, o: dict):
@@ -754,20 +839,30 @@ class Renderer:
             p.drawOn(canvas, 0, -h - ad[1])
         canvas.restoreState()
 
-    def draw_page(self, canvas: Canvas, order: Order, op: OrderPosition, show_page=True):
+    def draw_page(self, canvas: Canvas, order: Order, op: OrderPosition, show_page=True, only_page=None):
-        for o in self.layout:
+        page_count = self.bg_pdf.getNumPages()
-            if o['type'] == "barcodearea":
+
-                self._draw_barcodearea(canvas, op, o)
+        if not only_page and not show_page:
-            elif o['type'] == "imagearea":
+            raise ValueError("only_page=None and show_page=False cannot be combined")
-                self._draw_imagearea(canvas, op, order, o)
+
-            elif o['type'] == "textarea":
+        for page in range(page_count):
-                self._draw_textarea(canvas, op, order, o)
+            if only_page and only_page != page + 1:
-            elif o['type'] == "poweredby":
+                continue
-                self._draw_poweredby(canvas, op, o)
+            for o in self.layout:
-            if self.bg_pdf:
+                if o.get('page', 1) != page + 1:
-                canvas.setPageSize((self.bg_pdf.getPage(0).mediaBox[2], self.bg_pdf.getPage(0).mediaBox[3]))
+                    continue
-        if show_page:
+                if o['type'] == "barcodearea":
-            canvas.showPage()
+                    self._draw_barcodearea(canvas, op, order, o)
+                elif o['type'] == "imagearea":
+                    self._draw_imagearea(canvas, op, order, o)
+                elif o['type'] == "textarea":
+                    self._draw_textarea(canvas, op, order, o)
+                elif o['type'] == "poweredby":
+                    self._draw_poweredby(canvas, op, o)
+                if self.bg_pdf:
+                    canvas.setPageSize((self.bg_pdf.getPage(page).mediaBox[2], self.bg_pdf.getPage(page).mediaBox[3]))
+            if show_page:
+                canvas.showPage()
 
     def render_background(self, buffer, title=_('Ticket')):
         if settings.PDFTK:
@@ -780,7 +875,7 @@ class Renderer:
                 subprocess.run([
                     settings.PDFTK,
                     os.path.join(d, 'front.pdf'),
-                    'background',
+                    'multibackground',
                     os.path.join(d, 'back.pdf'),
                     'output',
                     os.path.join(d, 'out.pdf'),
@@ -794,8 +889,8 @@ class Renderer:
             new_pdf = PdfFileReader(buffer)
             output = PdfFileWriter()
 
-            for page in new_pdf.pages:
+            for i, page in enumerate(new_pdf.pages):
-                bg_page = copy.copy(self.bg_pdf.getPage(0))
+                bg_page = copy.copy(self.bg_pdf.getPage(i))
                 bg_page.mergePage(page)
                 output.addPage(bg_page)
 

src/pretix/base/reldate.py

@@ -273,6 +273,11 @@ class RelativeDateTimeField(forms.MultiValueField):
                 minutes_before=None
             ))
 
+    def has_changed(self, initial, data):
+        if initial is None:
+            initial = self.widget.decompress(initial)
+        return super().has_changed(initial, data)
+
     def clean(self, value):
         if value[0] == 'absolute' and not value[1]:
             raise ValidationError(self.error_messages['incomplete'])

src/pretix/base/secrets.py

@@ -247,7 +247,7 @@ def assign_ticket_secret(event, position, force_invalidate_if_revokation_list_us
         **kwargs
     )
     changed = position.secret != secret
-    if position.secret and changed and gen.use_revocation_list:
+    if position.secret and changed and gen.use_revocation_list and position.pk:
         position.revoked_secrets.create(event=event, secret=position.secret)
     position.secret = secret
     if save and changed:

src/pretix/base/services/cancelevent.py

@@ -214,8 +214,8 @@ def cancel_event(self, event: Event, subevent: int, auto_refund: bool,
             refund_amount = o.payment_refund_sum
 
             try:
-                if auto_refund:
+                if auto_refund or manual_refund:
-                    _try_auto_refund(o.pk, manual_refund=manual_refund, allow_partial=True,
+                    _try_auto_refund(o.pk, auto_refund=auto_refund, manual_refund=manual_refund, allow_partial=True,
                                      source=OrderRefund.REFUND_SOURCE_ADMIN, refund_as_giftcard=refund_as_giftcard,
                                      giftcard_expires=giftcard_expires, giftcard_conditions=giftcard_conditions,
                                      comment=gettext('Event canceled'))
@@ -272,8 +272,8 @@ def cancel_event(self, event: Event, subevent: int, auto_refund: bool,
             ocm.commit()
             refund_amount = o.payment_refund_sum - o.total
 
-            if auto_refund:
+            if auto_refund or manual_refund:
-                _try_auto_refund(o.pk, manual_refund=manual_refund, allow_partial=True,
+                _try_auto_refund(o.pk, auto_refund=auto_refund, manual_refund=manual_refund, allow_partial=True,
                                  source=OrderRefund.REFUND_SOURCE_ADMIN, refund_as_giftcard=refund_as_giftcard,
                                  giftcard_expires=giftcard_expires, giftcard_conditions=giftcard_conditions,
                                  comment=gettext('Event canceled'))

src/pretix/base/services/cart.py

@@ -426,10 +426,10 @@ class CartManager:
                 if not cp.includes_tax:
                     price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent,
                                             cp_is_net=True, bundled_sum=bundled_sum)
-                    price = TaxedPrice(net=price.net, gross=price.net, rate=0, tax=0, name='')
+                    price = TaxedPrice(net=price.net, gross=price.net, rate=Decimal('0'), tax=Decimal('0'), name='')
                     pbv = self._get_price(cp.item, cp.variation, None, cp.price, cp.subevent,
                                           cp_is_net=True, bundled_sum=bundled_sum)
-                    pbv = TaxedPrice(net=pbv.net, gross=pbv.net, rate=0, tax=0, name='')
+                    pbv = TaxedPrice(net=pbv.net, gross=pbv.net, rate=Decimal('0'), tax=Decimal('0'), name='')
                 else:
                     price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent,
                                             bundled_sum=bundled_sum)
@@ -1106,10 +1106,11 @@ def update_tax_rates(event: Event, cart_id: str, invoice_address: InvoiceAddress
         rate = pos.item.tax_rule.tax_rate_for(invoice_address)
 
         if pos.tax_rate != rate:
-            current_net = pos.price - pos.tax_value
+            if not pos.item.tax_rule.keep_gross_if_rate_changes:
-            new_gross = pos.item.tax(current_net, base_price_is='net', invoice_address=invoice_address).gross
+                current_net = pos.price - pos.tax_value
-            totaldiff += new_gross - pos.price
+                new_gross = pos.item.tax(current_net, base_price_is='net', invoice_address=invoice_address).gross
-            pos.price = new_gross
+                totaldiff += new_gross - pos.price
+                pos.price = new_gross
             pos.includes_tax = rate != Decimal('0.00')
             pos.override_tax_rate = rate
             pos.save(update_fields=['price', 'includes_tax', 'override_tax_rate'])

src/pretix/base/services/checkin.py

@@ -41,8 +41,8 @@ import pytz
 from django.core.files import File
 from django.db import IntegrityError, transaction
 from django.db.models import (
-    BooleanField, Count, ExpressionWrapper, F, IntegerField, OuterRef, Q,
+    BooleanField, Count, ExpressionWrapper, F, IntegerField, Max, Min,
-    Subquery, Value,
+    OuterRef, Q, Subquery, Value,
 )
 from django.db.models.functions import Coalesce, TruncDate
 from django.dispatch import receiver
@@ -60,7 +60,7 @@ from pretix.helpers.jsonlogic import Logic
 from pretix.helpers.jsonlogic_boolalg import convert_to_dnf
 from pretix.helpers.jsonlogic_query import (
     Equal, GreaterEqualThan, GreaterThan, InList, LowerEqualThan, LowerThan,
-    tolerance,
+    MinutesSince, tolerance,
 )
 
 
@@ -210,19 +210,60 @@ def _logic_explain(rules, ev, rule_data):
         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'):
+        elif var in ('entries_number', 'entries_today', 'entries_days', 'minutes_since_last_entry', 'minutes_since_first_entry', 'now_isoweekday'):
             w = {
+                'minutes_since_first_entry': 80,
+                'minutes_since_last_entry': 90,
                 'entries_days': 100,
                 'entries_number': 120,
                 'entries_today': 140,
+                'now_isoweekday': 210,
+            }
+            operator_weights = {
+                '==': 2,
+                '<': 1,
+                '<=': 1,
+                '>': 1,
+                '>=': 1,
+                '!=': 3,
             }
             l = {
+                'minutes_since_last_entry': _('time since last entry'),
+                'minutes_since_first_entry': _('time since first entry'),
                 'entries_days': _('number of days with an entry'),
                 'entries_number': _('number of entries'),
                 'entries_today': _('number of entries today'),
+                'now_isoweekday': _('week day'),
             }
             compare_to = rhs[0]
-            var_weights[vname] = (w[var], abs(compare_to - rule_data[var]))
+            penalty = 0
+
+            if var in ('minutes_since_last_entry', 'minutes_since_first_entry'):
+                is_comparison_to_minus_one = (
+                    (operator == '<' and compare_to <= 0) or
+                    (operator == '<=' and compare_to < 0) or
+                    (operator == '>=' and compare_to < 0) or
+                    (operator == '>' and compare_to <= 0) or
+                    (operator == '==' and compare_to == -1) or
+                    (operator == '!=' and compare_to == -1)
+                )
+                if is_comparison_to_minus_one:
+                    # 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]))
+
+            if var == 'now_isoweekday':
+                compare_to = {
+                    1: _('Monday'),
+                    2: _('Tuesday'),
+                    3: _('Wednesday'),
+                    4: _('Thursday'),
+                    5: _('Friday'),
+                    6: _('Saturday'),
+                    7: _('Sunday'),
+                }.get(compare_to, compare_to)
+
             if operator == '==':
                 var_texts[vname] = _('{variable} is not {value}').format(variable=l[var], value=compare_to)
             elif operator in ('<', '<='):
@@ -231,6 +272,7 @@ def _logic_explain(rules, ev, rule_data):
                 var_texts[vname] = _('Minimum {variable} exceeded').format(variable=l[var])
             elif operator == '!=':
                 var_texts[vname] = _('{variable} is {value}').format(variable=l[var], value=compare_to)
+
         else:
             raise ValueError(f'Unknown variable {var}')
 
@@ -289,6 +331,11 @@ class LazyRuleVars:
     def now(self):
         return self._dt
 
+    @property
+    def now_isoweekday(self):
+        tz = self._clist.event.timezone
+        return self._dt.astimezone(tz).isoweekday()
+
     @property
     def product(self):
         return self._position.item_id
@@ -315,6 +362,30 @@ class LazyRuleVars:
                 day=TruncDate('datetime', tzinfo=tz)
             ).values('day').distinct().count()
 
+    @cached_property
+    def minutes_since_last_entry(self):
+        tz = self._clist.event.timezone
+        with override(tz):
+            last_entry = self._position.checkins.filter(list=self._clist, type=Checkin.TYPE_ENTRY).order_by('datetime').last()
+            if last_entry is None:
+                # Returning "None" would be "correct", but the handling of "None" in JSON logic is inconsistent
+                # between platforms (None<1 is true on some, but not all), we rather choose something that is at least
+                # consistent.
+                return -1
+            return (now() - last_entry.datetime).total_seconds() // 60
+
+    @cached_property
+    def minutes_since_first_entry(self):
+        tz = self._clist.event.timezone
+        with override(tz):
+            last_entry = self._position.checkins.filter(list=self._clist, type=Checkin.TYPE_ENTRY).order_by('datetime').first()
+            if last_entry is None:
+                # Returning "None" would be "correct", but the handling of "None" in JSON logic is inconsistent
+                # between platforms (None<1 is true on some, but not all), we rather choose something that is at least
+                # consistent.
+                return -1
+            return (now() - last_entry.datetime).total_seconds() // 60
+
 
 class SQLLogic:
     """
@@ -373,22 +444,22 @@ class SQLLogic:
                 ).astimezone(pytz.UTC))
             elif values[0] == 'date_from':
                 return Coalesce(
-                    F(f'subevent__date_from'),
+                    F('subevent__date_from'),
-                    F(f'order__event__date_from'),
+                    F('order__event__date_from'),
                 )
             elif values[0] == 'date_to':
                 return Coalesce(
-                    F(f'subevent__date_to'),
+                    F('subevent__date_to'),
-                    F(f'subevent__date_from'),
+                    F('subevent__date_from'),
-                    F(f'order__event__date_to'),
+                    F('order__event__date_to'),
-                    F(f'order__event__date_from'),
+                    F('order__event__date_from'),
                 )
             elif values[0] == 'date_admission':
                 return Coalesce(
-                    F(f'subevent__date_admission'),
+                    F('subevent__date_admission'),
-                    F(f'subevent__date_from'),
+                    F('subevent__date_from'),
-                    F(f'order__event__date_admission'),
+                    F('order__event__date_admission'),
-                    F(f'order__event__date_from'),
+                    F('order__event__date_from'),
                 )
             else:
                 raise ValueError(f'Unknown time type {values[0]}')
@@ -399,6 +470,8 @@ class SQLLogic:
         elif operator == 'var':
             if values[0] == 'now':
                 return Value(now().astimezone(pytz.UTC))
+            elif values[0] == 'now_isoweekday':
+                return Value(now().astimezone(self.list.event.timezone).isoweekday())
             elif values[0] == 'product':
                 return F('item_id')
             elif values[0] == 'variation':
@@ -450,6 +523,38 @@ class SQLLogic:
                     Value(0),
                     output_field=IntegerField()
                 )
+            elif values[0] == 'minutes_since_last_entry':
+                sq_last_entry = Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                    ).values('position_id').order_by().annotate(
+                        m=Max('datetime')
+                    ).values('m')
+                )
+
+                return Coalesce(
+                    MinutesSince(sq_last_entry),
+                    Value(-1),
+                    output_field=IntegerField()
+                )
+            elif values[0] == 'minutes_since_first_entry':
+                sq_last_entry = Subquery(
+                    Checkin.objects.filter(
+                        position_id=OuterRef('pk'),
+                        type=Checkin.TYPE_ENTRY,
+                        list_id=self.list.pk,
+                    ).values('position_id').order_by().annotate(
+                        m=Min('datetime')
+                    ).values('m')
+                )
+
+                return Coalesce(
+                    MinutesSince(sq_last_entry),
+                    Value(-1),
+                    output_field=IntegerField()
+                )
         else:
             raise ValueError(f'Unknown operator {operator}')
 

src/pretix/base/services/export.py

@@ -56,6 +56,8 @@ def export(self, event: Event, fileid: str, provider: str, form_data: Dict[str,
     with language(event.settings.locale, event.settings.region), override(event.settings.timezone):
         responses = register_data_exporters.send(event)
         for receiver, response in responses:
+            if not response:
+                continue
             ex = response(event, event.organizer, set_progress)
             if ex.identifier == provider:
                 d = ex.render(form_data)

src/pretix/base/services/invoices.py

@@ -102,7 +102,7 @@ def build_invoice(invoice: Invoice) -> Invoice:
             payment = ""
         if invoice.event.settings.invoice_include_expire_date and invoice.order.status == Order.STATUS_PENDING:
             if payment:
-                payment += "<br />"
+                payment += "<br /><br />"
             payment += pgettext("invoice", "Please complete your payment before {expire_date}.").format(
                 expire_date=date_format(invoice.order.expires, "SHORT_DATE_FORMAT")
             )

src/pretix/base/services/mail.py

@@ -35,6 +35,7 @@
 import hashlib
 import inspect
 import logging
+import mimetypes
 import os
 import re
 import smtplib
@@ -51,6 +52,7 @@ from bs4 import BeautifulSoup
 from celery import chain
 from celery.exceptions import MaxRetriesExceededError
 from django.conf import settings
+from django.core.files.storage import default_storage
 from django.core.mail import (
     EmailMultiAlternatives, SafeMIMEMultipart, get_connection,
 )
@@ -73,8 +75,9 @@ from pretix.base.services.tasks import TransactionAwareTask
 from pretix.base.services.tickets import get_tickets_for_order
 from pretix.base.signals import email_filter, global_email_filter
 from pretix.celery_app import app
+from pretix.helpers.hierarkey import clean_filename
 from pretix.multidomain.urlreverse import build_absolute_uri
-from pretix.presale.ical import get_ical
+from pretix.presale.ical import get_private_icals
 
 logger = logging.getLogger('pretix.base.mail')
 INVALID_ADDRESS = 'invalid-pretix-mail-address'
@@ -94,7 +97,7 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
          context: Dict[str, Any] = None, event: Event = None, locale: str = None, order: Order = None,
          position: OrderPosition = None, *, headers: dict = None, sender: str = None, organizer: Organizer = None,
          customer: Customer = None, invoices: Sequence = None, attach_tickets=False, auto_email=True, user=None,
-         attach_ical=False, attach_cached_files: Sequence = None):
+         attach_ical=False, attach_cached_files: Sequence = None, attach_other_files: list=None):
     """
     Sends out an email to a user. The mail will be sent synchronously or asynchronously depending on the installation.
 
@@ -142,6 +145,8 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
 
     :param attach_cached_files: A list of cached file to attach to this email.
 
+    :param attach_other_files: A list of file paths on our storage to attach.
+
     :raises MailOrderException: on obvious, immediate failures. Not raising an exception does not necessarily mean
         that the email has been sent, just that it has been queued by the email backend.
     """
@@ -212,7 +217,8 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
                 for bcc_mail in settings_holder.settings.mail_bcc.split(','):
                     bcc.append(bcc_mail.strip())
 
-            if settings_holder.settings.mail_from == settings.DEFAULT_FROM_EMAIL and settings_holder.settings.contact_mail and not headers.get('Reply-To'):
+            if settings_holder.settings.mail_from in (settings.DEFAULT_FROM_EMAIL, settings.MAIL_FROM_ORGANIZERS) \
+                    and settings_holder.settings.contact_mail and not headers.get('Reply-To'):
                 headers['Reply-To'] = settings_holder.settings.contact_mail
 
             prefix = settings_holder.settings.get('mail_prefix')
@@ -301,6 +307,7 @@ def mail(email: Union[str, Sequence[str]], subject: str, template: Union[str, La
             organizer=organizer.pk if organizer else None,
             customer=customer.pk if customer else None,
             attach_cached_files=[(cf.id if isinstance(cf, CachedFile) else cf) for cf in attach_cached_files] if attach_cached_files else [],
+            attach_other_files=attach_other_files,
         )
 
         if invoices:
@@ -338,7 +345,8 @@ class CustomEmail(EmailMultiAlternatives):
 def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: str, sender: str,
                    event: int = None, position: int = None, headers: dict = None, bcc: List[str] = None,
                    invoices: List[int] = None, order: int = None, attach_tickets=False, user=None,
-                   organizer=None, customer=None, attach_ical=False, attach_cached_files: List[int] = None) -> bool:
+                   organizer=None, customer=None, attach_ical=False, attach_cached_files: List[int] = None,
+                   attach_other_files: List[str] = None) -> bool:
     email = CustomEmail(subject, body, sender, to=to, bcc=bcc, headers=headers)
     if html is not None:
         html_message = SafeMIMEMultipart(_subtype='related', encoding=settings.DEFAULT_CHARSET)
@@ -422,18 +430,7 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                                     }
                                 )
                         if attach_ical:
-                            ical_events = set()
+                            for i, cal in enumerate(get_private_icals(event, [position] if position else order.positions.all())):
-                            if event.has_subevents:
-                                if position:
-                                    ical_events.add(position.subevent)
-                                else:
-                                    for p in order.positions.all():
-                                        ical_events.add(p.subevent)
-                            else:
-                                ical_events.add(order.event)
-
-                            for i, e in enumerate(ical_events):
-                                cal = get_ical([e])
                                 email.attach('event-{}.ics'.format(i), cal.serialize(), 'text/calendar')
 
             email = email_filter.send_chained(event, 'message', message=email, order=order, user=user)
@@ -455,6 +452,20 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                         logger.exception('Could not attach invoice to email')
                         pass
 
+        if attach_other_files:
+            for fname in attach_other_files:
+                ftype, _ = mimetypes.guess_type(fname)
+                data = default_storage.open(fname).read()
+                try:
+                    email.attach(
+                        clean_filename(os.path.basename(fname)),
+                        data,
+                        ftype
+                    )
+                except:
+                    logger.exception('Could not attach file to email')
+                    pass
+
         if attach_cached_files:
             for cf in CachedFile.objects.filter(id__in=attach_cached_files):
                 if cf.file:
@@ -568,7 +579,7 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                             }
                         )
                     raise e
-            if logger:
+            if log_target:
                 log_target.log_action(
                     'pretix.email.error',
                     data={

src/pretix/base/services/notifications.py

@@ -148,7 +148,7 @@ def send_notification_mail(notification: Notification, user: User):
         ),
         'body': body_plain,
         'html': body_html,
-        'sender': settings.MAIL_FROM,
+        'sender': settings.MAIL_FROM_NOTIFICATIONS,
         'headers': {},
         'user': user.pk
     })

src/pretix/base/services/orders.py

@@ -53,7 +53,7 @@ from django.db.transaction import get_connection
 from django.dispatch import receiver
 from django.utils.functional import cached_property
 from django.utils.timezone import make_aware, now
-from django.utils.translation import gettext as _
+from django.utils.translation import gettext as _, gettext_lazy
 from django_scopes import scopes_disabled
 
 from pretix.api.models import OAuthApplication
@@ -384,7 +384,7 @@ def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
 
 
 def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device=None, oauth_application=None,
-                  cancellation_fee=None, keep_fees=None, cancel_invoice=True):
+                  cancellation_fee=None, keep_fees=None, cancel_invoice=True, comment=None):
     """
     Mark this order as canceled
     :param order: The order to change
@@ -481,7 +481,7 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
                     Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
 
         order.log_action('pretix.event.order.canceled', user=user, auth=api_token or oauth_application or device,
-                         data={'cancellation_fee': cancellation_fee})
+                         data={'cancellation_fee': cancellation_fee, 'comment': comment})
         order.cancellation_requests.all().delete()
 
         order.create_transactions()
@@ -489,7 +489,7 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
         if send_mail:
             email_template = order.event.settings.mail_text_order_canceled
             with language(order.locale, order.event.settings.region):
-                email_context = get_email_context(event=order.event, order=order)
+                email_context = get_email_context(event=order.event, order=order, comment=comment or "")
                 email_subject = _('Order canceled: %(code)s') % {'code': order.code}
                 try:
                     order.send_mail(
@@ -700,7 +700,7 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
                                 invoice_address=address, force_custom_price=True, max_discount=max_discount)
                 changed_prices[cp.pk] = bprice
             else:
-                bundled_sum = 0
+                bundled_sum = Decimal('0.00')
                 if not cp.addon_to_id:
                     for bundledp in cp.addons.all():
                         if bundledp.is_bundled:
@@ -856,7 +856,7 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
             total=total,
             testmode=True if sales_channel.testmode_supported and event.testmode else False,
             meta_info=json.dumps(meta_info or {}),
-            require_approval=any(p.item.require_approval for p in positions),
+            require_approval=any(p.requires_approval(invoice_address=address) for p in positions),
             sales_channel=sales_channel.identifier,
             customer=customer,
         )
@@ -932,33 +932,38 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
 
 
 def _order_placed_email(event: Event, order: Order, pprov: BasePaymentProvider, email_template, log_entry: str,
-                        invoice, payment: OrderPayment):
+                        invoice, payment: OrderPayment, is_free=False):
     email_context = get_email_context(event=event, order=order, payment=payment if pprov else None)
-    email_subject = _('Your order: %(code)s') % {'code': order.code}
+    email_subject = gettext_lazy('Your order: {code}')
     try:
         order.send_mail(
             email_subject, email_template, email_context,
             log_entry,
             invoices=[invoice] if invoice and event.settings.invoice_email_attachment else [],
             attach_tickets=True,
-            attach_ical=event.settings.mail_attach_ical
+            attach_ical=event.settings.mail_attach_ical and (not event.settings.mail_attach_ical_paid_only or is_free),
+            attach_other_files=[a for a in [
+                event.settings.get('mail_attachment_new_order', as_type=str, default='')[len('file://'):]
+            ] if a],
         )
     except SendMailException:
         logger.exception('Order received email could not be sent')
 
 
-def _order_placed_email_attendee(event: Event, order: Order, position: OrderPosition, email_template, log_entry: str):
+def _order_placed_email_attendee(event: Event, order: Order, position: OrderPosition, email_template, log_entry: str, is_free=False):
     email_context = get_email_context(event=event, order=order, position=position)
-    email_subject = _('Your event registration: %(code)s') % {'code': order.code}
+    email_subject = gettext_lazy('Your event registration: {code}')
 
     try:
-        order.send_mail(
+        position.send_mail(
             email_subject, email_template, email_context,
             log_entry,
             invoices=[],
             attach_tickets=True,
-            position=position,
+            attach_ical=event.settings.mail_attach_ical and (not event.settings.mail_attach_ical_paid_only or is_free),
-            attach_ical=event.settings.mail_attach_ical
+            attach_other_files=[a for a in [
+                event.settings.get('mail_attachment_new_order', as_type=str, default='')[len('file://'):]
+            ] if a],
         )
     except SendMailException:
         logger.exception('Order received email could not be sent to attendee')
@@ -1064,11 +1069,13 @@ def _perform_order(event: Event, payment_provider: str, position_ids: List[str],
             email_attendees_template = event.settings.mail_text_order_placed_attendee
 
         if sales_channel in event.settings.mail_sales_channel_placed_paid:
-            _order_placed_email(event, order, pprov, email_template, log_entry, invoice, payment)
+            _order_placed_email(event, order, pprov, email_template, log_entry, invoice, payment,
+                                is_free=free_order_flow)
             if email_attendees:
                 for p in order.positions.all():
                     if p.addon_to_id is None and p.attendee_email and p.attendee_email != order.email:
-                        _order_placed_email_attendee(event, order, p, email_attendees_template, log_entry)
+                        _order_placed_email_attendee(event, order, p, email_attendees_template, log_entry,
+                                                     is_free=free_order_flow)
 
     return order.id
 
@@ -1460,7 +1467,7 @@ class OrderChangeManager:
         if self.order.event.settings.invoice_include_free or position.price != Decimal('0.00'):
             self._invoice_dirty = True
 
-    def add_position(self, item: Item, variation: ItemVariation, price: Decimal, addon_to: Order = None,
+    def add_position(self, item: Item, variation: ItemVariation, price: Decimal, addon_to: OrderPosition = None,
                      subevent: SubEvent = None, seat: Seat = None, membership: Membership = None):
         if isinstance(seat, str):
             if not seat:
@@ -1485,6 +1492,8 @@ class OrderChangeManager:
 
         if price is None:
             raise OrderError(self.error_messages['product_invalid'])
+        if item.variations.exists() and not variation:
+            raise OrderError(self.error_messages['product_without_variation'])
         if not addon_to and item.category and item.category.is_addon:
             raise OrderError(self.error_messages['addon_to_required'])
         if addon_to:
@@ -1520,6 +1529,8 @@ class OrderChangeManager:
             self._invoice_dirty = True
 
         self._operations.append(self.SplitOperation(position))
+        for a in position.addons.all():
+            self._operations.append(self.SplitOperation(a))
 
     def set_addons(self, addons):
         if self._operations:
@@ -1586,21 +1597,22 @@ class OrderChangeManager:
 
             op = opcache[a['addon_to']]
             item = _items_cache[a['item']]
+            subevent = op.subevent  # for now, we might lift this requirement later
             variation = _variations_cache[a['variation']] if a['variation'] is not None else None
 
             if item.category_id not in available_categories[op.pk]:
                 raise OrderError(error_messages['addon_invalid_base'])
 
             # Fetch all quotas. If there are no quotas, this item is not allowed to be sold.
-            quotas = list(item.quotas.filter(subevent=op.subevent)
+            quotas = list(item.quotas.filter(subevent=subevent)
-                          if variation is None else variation.quotas.filter(subevent=op.subevent))
+                          if variation is None else variation.quotas.filter(subevent=subevent))
             if not quotas:
                 raise OrderError(error_messages['unavailable'])
 
             if (a['item'], a['variation']) in input_addons[op.id]:
                 raise OrderError(error_messages['addon_duplicate_item'])
 
-            if item.require_voucher or op.item.hide_without_voucher or (op.variation and op.variation.hide_without_voucher):
+            if item.require_voucher or item.hide_without_voucher or (variation and variation.hide_without_voucher):
                 raise OrderError(error_messages['voucher_required'])
 
             if not item.is_available() or (variation and not variation.is_available()):
@@ -1610,11 +1622,11 @@ class OrderChangeManager:
                     variation and self.order.sales_channel not in variation.sales_channels):
                 raise OrderError(error_messages['unavailable'])
 
-            if op.subevent and item.pk in op.subevent.item_overrides and not op.subevent.item_overrides[op.item.pk].is_available():
+            if subevent and item.pk in subevent.item_overrides and not subevent.item_overrides[item.pk].is_available():
                 raise OrderError(error_messages['not_for_sale'])
 
-            if op.subevent and variation and variation.pk in op.subevent.var_overrides and \
+            if subevent and variation and variation.pk in subevent.var_overrides and \
-                    not op.subevent.var_overrides[variation.pk].is_available():
+                    not subevent.var_overrides[variation.pk].is_available():
                 raise OrderError(error_messages['not_for_sale'])
 
             if item.has_variations and not variation:
@@ -1623,10 +1635,10 @@ class OrderChangeManager:
             if variation and variation.item_id != item.pk:
                 raise OrderError(error_messages['not_for_sale'])
 
-            if op.subevent and op.subevent.presale_start and now() < op.subevent.presale_start:
+            if subevent and subevent.presale_start and now() < subevent.presale_start:
                 raise OrderError(error_messages['not_started'])
 
-            if (op.subevent and op.subevent.presale_has_ended) or self.event.presale_has_ended:
+            if (subevent and subevent.presale_has_ended) or self.event.presale_has_ended:
                 raise OrderError(error_messages['ended'])
 
             if item.require_bundling:
@@ -2065,7 +2077,7 @@ class OrderChangeManager:
         split_order.code = None
         split_order.datetime = now()
         split_order.secret = generate_secret()
-        split_order.require_approval = self.order.require_approval and any(p.item.require_approval for p in split_positions)
+        split_order.require_approval = self.order.require_approval and any(p.requires_approval(invoice_address=self._invoice_address) for p in split_positions)
         split_order.save()
         split_order.log_action('pretix.event.order.changed.split_from', user=self.user, auth=self.auth, data={
             'original_order': self.order.code
@@ -2317,10 +2329,10 @@ class OrderChangeManager:
                 except TaxRule.SaleNotAllowed:
                     raise OrderError(self.error_messages['tax_rule_country_blocked'])
             self._recalculate_total_and_payment_fee()
-            if self.order.status in (Order.STATUS_PENDING, Order.STATUS_PAID):
-                self._reissue_invoice()
             self._check_paid_price_change()
             self._check_paid_to_free()
+            if self.order.status in (Order.STATUS_PENDING, Order.STATUS_PAID):
+                self._reissue_invoice()
             self._clear_tickets_cache()
             self.order.touch()
             self.order.create_transactions()
@@ -2375,7 +2387,8 @@ def perform_order(self, event: Event, payment_provider: str, positions: List[str
 _unset = object()
 
 
-def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=OrderRefund.REFUND_SOURCE_BUYER,
+def _try_auto_refund(order, auto_refund=True, manual_refund=False, allow_partial=False,
+                     source=OrderRefund.REFUND_SOURCE_BUYER,
                      refund_as_giftcard=False, giftcard_expires=_unset, giftcard_conditions=None, comment=None):
     notify_admin = False
     error = False
@@ -2385,9 +2398,9 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
     if refund_amount <= Decimal('0.00'):
         return
 
+    can_auto_refund_sum = 0
+
     if refund_as_giftcard:
-        proposals = {}
-        can_auto_refund = True
         can_auto_refund_sum = refund_amount
         with transaction.atomic():
             giftcard = order.event.organizer.issued_gift_cards.create(
@@ -2427,42 +2440,41 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
                 if r.state != OrderRefund.REFUND_STATE_DONE:
                     notify_admin = True
 
-    else:
+    elif auto_refund:
         proposals = order.propose_auto_refunds(refund_amount)
         can_auto_refund_sum = sum(proposals.values())
-        can_auto_refund = (allow_partial and can_auto_refund_sum) or can_auto_refund_sum == refund_amount
+        if (allow_partial and can_auto_refund_sum) or can_auto_refund_sum == refund_amount:
-    if can_auto_refund:
+            for p, value in proposals.items():
-        for p, value in proposals.items():
-            with transaction.atomic():
-                r = order.refunds.create(
-                    payment=p,
-                    source=source,
-                    state=OrderRefund.REFUND_STATE_CREATED,
-                    amount=value,
-                    comment=comment,
-                    provider=p.provider
-                )
-                order.log_action('pretix.event.order.refund.created', {
-                    'local_id': r.local_id,
-                    'provider': r.provider,
-                })
-
-            try:
-                r.payment_provider.execute_refund(r)
-            except PaymentException as e:
                 with transaction.atomic():
-                    r.state = OrderRefund.REFUND_STATE_FAILED
+                    r = order.refunds.create(
-                    r.save()
+                        payment=p,
-                    order.log_action('pretix.event.order.refund.failed', {
+                        source=source,
+                        state=OrderRefund.REFUND_STATE_CREATED,
+                        amount=value,
+                        comment=comment,
+                        provider=p.provider
+                    )
+                    order.log_action('pretix.event.order.refund.created', {
                         'local_id': r.local_id,
                         'provider': r.provider,
-                        'error': str(e)
                     })
-                error = True
+
-                notify_admin = True
+                try:
-            else:
+                    r.payment_provider.execute_refund(r)
-                if r.state not in (OrderRefund.REFUND_STATE_TRANSIT, OrderRefund.REFUND_STATE_DONE):
+                except PaymentException as e:
+                    with transaction.atomic():
+                        r.state = OrderRefund.REFUND_STATE_FAILED
+                        r.save()
+                        order.log_action('pretix.event.order.refund.failed', {
+                            'local_id': r.local_id,
+                            'provider': r.provider,
+                            'error': str(e)
+                        })
+                    error = True
                     notify_admin = True
+                else:
+                    if r.state not in (OrderRefund.REFUND_STATE_TRANSIT, OrderRefund.REFUND_STATE_DONE):
+                        notify_admin = True
 
     if refund_amount - can_auto_refund_sum > Decimal('0.00'):
         if manual_refund:
@@ -2494,15 +2506,15 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
 @app.task(base=ProfiledTask, bind=True, max_retries=5, default_retry_delay=1, throws=(OrderError,))
 @scopes_disabled()
 def cancel_order(self, order: int, user: int=None, send_mail: bool=True, api_token=None, oauth_application=None,
-                 device=None, cancellation_fee=None, try_auto_refund=False, refund_as_giftcard=False, comment=None,
+                 device=None, cancellation_fee=None, try_auto_refund=False, refund_as_giftcard=False,
-                 cancel_invoice=True):
+                 email_comment=None, refund_comment=None, cancel_invoice=True):
     try:
         try:
             ret = _cancel_order(order, user, send_mail, api_token, device, oauth_application,
-                                cancellation_fee, cancel_invoice=cancel_invoice)
+                                cancellation_fee, cancel_invoice=cancel_invoice, comment=email_comment)
             if try_auto_refund:
                 _try_auto_refund(order, refund_as_giftcard=refund_as_giftcard,
-                                 comment=comment)
+                                 comment=refund_comment)
             return ret
         except LockTimeoutException:
             self.retry()

src/pretix/base/services/quotas.py

@@ -113,10 +113,8 @@ class QuotaAvailability:
         be a few minutes outdated. In this case, you may not rely on the results in the ``count_*`` properties.
         """
         now_dt = now_dt or now()
-        quotas = list(set(self._queue))
+        quota_ids_set = {q.id for q in self._queue}
-        quotas_original = list(self._queue)
+        if not quota_ids_set:
-        self._queue.clear()
-        if not quotas:
             return
 
         if allow_cache:
@@ -129,7 +127,7 @@ class QuotaAvailability:
             elif settings.HAS_REDIS:
                 rc = get_redis_connection("redis")
                 quotas_by_event = defaultdict(list)
-                for q in quotas_original:
+                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():
@@ -139,16 +137,19 @@ class QuotaAvailability:
                             data = [rv for rv in redisval.decode().split(',')]
                             # Except for some rare situations, we don't want to use cache entries older than 2 minutes
                             if time.time() - int(data[2]) < 120 or allow_cache_stale:
-                                quotas_original.remove(q)
+                                quota_ids_set.remove(q.id)
-                                quotas.remove(q)
                                 if data[1] == "None":
                                     self.results[q] = int(data[0]), None
                                 else:
                                     self.results[q] = int(data[0]), int(data[1])
 
-        if not quotas:
+        if not quota_ids_set:
             return
 
+        quotas = [_q for _q in self._queue if _q.id in quota_ids_set]
+        quotas_original = list(quotas)
+        self._queue.clear()
+
         self._compute(quotas, now_dt)
 
         for q in quotas_original:
@@ -284,15 +285,16 @@ class QuotaAvailability:
         seq = Q(subevent_id__in=subevents)
         if None in subevents:
             seq |= Q(subevent__isnull=True)
+        quota_ids = {q.pk for q in quotas}
         op_lookup = OrderPosition.objects.filter(
             order__status__in=[Order.STATUS_PAID, Order.STATUS_PENDING],
             order__event_id__in=events,
         ).filter(seq).filter(
             Q(
                 Q(variation_id__isnull=True) &
-                Q(item_id__in={i['item_id'] for i in q_items if self._quota_objects[i['quota_id']] in quotas})
+                Q(item_id__in={i['item_id'] for i in q_items if i['quota_id'] in quota_ids})
             ) | Q(
-                variation_id__in={i['itemvariation_id'] for i in q_vars if self._quota_objects[i['quota_id']] in quotas})
+                variation_id__in={i['itemvariation_id'] for i in q_vars if i['quota_id'] in quota_ids})
         ).order_by()
         if any(q.release_after_exit for q in quotas):
             op_lookup = op_lookup.annotate(
@@ -359,6 +361,7 @@ class QuotaAvailability:
             func = 'GREATEST'
 
         subevents = {q.subevent_id for q in quotas}
+        quota_ids = {q.pk for q in quotas}
         seq = Q(subevent_id__in=subevents)
         if None in subevents:
             seq |= Q(subevent__isnull=True)
@@ -370,10 +373,9 @@ class QuotaAvailability:
             Q(
                 Q(
                     Q(variation_id__isnull=True) &
-                    Q(item_id__in={i['item_id'] for i in q_items if self._quota_objects[i['quota_id']] in quotas})
+                    Q(item_id__in={i['item_id'] for i in q_items if i['quota_id'] in quota_ids})
                 ) | Q(
-                    variation_id__in={i['itemvariation_id'] for i in q_vars if
+                    variation_id__in={i['itemvariation_id'] for i in q_vars if i['quota_id'] in quota_ids}
-                                      self._quota_objects[i['quota_id']] in quotas}
                 ) | Q(
                     quota_id__in=[q.pk for q in quotas]
                 )
@@ -398,6 +400,7 @@ class QuotaAvailability:
     def _compute_carts(self, quotas, q_items, q_vars, size_left, now_dt):
         events = {q.event_id for q in quotas}
         subevents = {q.subevent_id for q in quotas}
+        quota_ids = {q.pk for q in quotas}
         seq = Q(subevent_id__in=subevents)
         if None in subevents:
             seq |= Q(subevent__isnull=True)
@@ -413,9 +416,9 @@ class QuotaAvailability:
             Q(
                 Q(
                     Q(variation_id__isnull=True) &
-                    Q(item_id__in={i['item_id'] for i in q_items if self._quota_objects[i['quota_id']] in quotas})
+                    Q(item_id__in={i['item_id'] for i in q_items if i['quota_id'] in quota_ids})
                 ) | Q(
-                    variation_id__in={i['itemvariation_id'] for i in q_vars if self._quota_objects[i['quota_id']] in quotas}
+                    variation_id__in={i['itemvariation_id'] for i in q_vars if i['quota_id'] in quota_ids}
                 )
             )
         ).order_by().values('item_id', 'subevent_id', 'variation_id').annotate(c=Count('*'))
@@ -434,6 +437,7 @@ class QuotaAvailability:
     def _compute_waitinglist(self, quotas, q_items, q_vars, size_left):
         events = {q.event_id for q in quotas}
         subevents = {q.subevent_id for q in quotas}
+        quota_ids = {q.pk for q in quotas}
         seq = Q(subevent_id__in=subevents)
         if None in subevents:
             seq |= Q(subevent__isnull=True)
@@ -444,9 +448,8 @@ class QuotaAvailability:
             Q(
                 Q(
                     Q(variation_id__isnull=True) &
-                    Q(item_id__in={i['item_id'] for i in q_items if self._quota_objects[i['quota_id']] in quotas})
+                    Q(item_id__in={i['item_id'] for i in q_items if i['quota_id'] in quota_ids})
-                ) | Q(variation_id__in={i['itemvariation_id'] for i in q_vars if
+                ) | Q(variation_id__in={i['itemvariation_id'] for i in q_vars if i['quota_id'] in quota_ids})
-                                        self._quota_objects[i['quota_id']] in quotas})
             )
         ).order_by().values('item_id', 'subevent_id', 'variation_id').annotate(c=Count('*'))
         for line in w_lookup:

src/pretix/base/services/seating.py

@@ -45,7 +45,7 @@ def validate_plan_change(event, subevent, plan):
                 seat=OuterRef('pk'),
                 canceled=False,
             ).exclude(
-                order__status=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)
+                order__status__in=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)
             ))
         ).annotate(has_v=Count('vouchers')).filter(
             subevent=subevent,
@@ -69,7 +69,7 @@ def generate_seats(event, subevent, plan, mapping, blocked_guids=None):
             seat=OuterRef('pk'),
             canceled=False,
         ).exclude(
-            order__status=Order.STATUS_CANCELED
+            order__status__in=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)
         )),
         has_v=Count('vouchers')
     ).filter(subevent=subevent).order_by():
@@ -134,7 +134,7 @@ def generate_seats(event, subevent, plan, mapping, blocked_guids=None):
     Seat.objects.bulk_create(create_seats)
     CartPosition.objects.filter(seat__in=[s.pk for s in current_seats.values()]).delete()
     OrderPosition.all.filter(
-        Q(canceled=True) | Q(order__status=Order.STATUS_CANCELED),
+        Q(canceled=True) | Q(order__status__in=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)),
         seat__in=[s.pk for s in current_seats.values()],
     ).update(seat=None)
     Seat.objects.filter(pk__in=[s.pk for s in current_seats.values()]).delete()

src/pretix/base/settings.py

@@ -86,14 +86,32 @@ def primary_font_kwargs():
     from pretix.presale.style import get_fonts
 
     choices = [('Open Sans', 'Open Sans')]
-    choices += [
+    choices += sorted([
-        (a, {"title": a, "data": v}) for a, v in get_fonts().items()
+        (a, {"title": a, "data": v}) for a, v in get_fonts().items() if not v.get('pdf_only', False)
-    ]
+    ], key=lambda a: a[0])
     return {
         'choices': choices,
     }
 
 
+def restricted_plugin_kwargs():
+    from pretix.base.plugins import get_all_plugins
+
+    plugins_available = [
+        (p.module, p.name) for p in get_all_plugins(None)
+        if (
+            not p.name.startswith('.') and
+            getattr(p, 'restricted', False) and
+            not hasattr(p, 'is_available')  # this means you should not really use restricted and is_available
+        )
+    ]
+    return {
+        'widget': forms.CheckboxSelectMultiple,
+        'label': _("Allow usage of restricted plugins"),
+        'choices': plugins_available,
+    }
+
+
 class LazyI18nStringList(UserList):
     def __init__(self, init_list=None):
         super().__init__()
@@ -109,6 +127,13 @@ class LazyI18nStringList(UserList):
 
 
 DEFAULTS = {
+    'allowed_restricted_plugins': {
+        'default': [],
+        'type': list,
+        'form_class': forms.MultipleChoiceField,
+        'serializer_class': serializers.MultipleChoiceField,
+        'form_kwargs': lambda: restricted_plugin_kwargs(),
+    },
     'customer_accounts': {
         'default': 'False',
         'type': bool,
@@ -136,11 +161,15 @@ DEFAULTS = {
         'type': int,
         'form_class': forms.IntegerField,
         'serializer_class': serializers.IntegerField,
+        'serializer_kwargs': dict(
+            min_value=1,
+        ),
         'form_kwargs': dict(
             min_value=1,
+            required=True,
             label=_("Maximum number of items per order"),
             help_text=_("Add-on products will not be counted.")
-        )
+        ),
     },
     'display_net_prices': {
         'default': 'False',
@@ -368,11 +397,12 @@ DEFAULTS = {
         'form_class': I18nFormField,
         'serializer_class': I18nField,
         'form_kwargs': dict(
-            label=_("Custom address field"),
+            label=_("Custom recipient field"),
             widget=I18nTextInput,
             help_text=_("If you want to add a custom text field, e.g. for a country-specific registration number, to "
                         "your invoice address form, please fill in the label here. This label will both be used for "
-                        "asking the user to input their details as well as for displaying the value on the invoice. "
+                        "asking the user to input their details as well as for displaying the value on the invoice. It will "
+                        "be shown on the invoice below the headline. "
                         "The field will not be required.")
         )
     },
@@ -440,9 +470,11 @@ DEFAULTS = {
         'type': int,
         'form_class': forms.IntegerField,
         'serializer_class': serializers.IntegerField,
+        'serializer_kwargs': dict(),
         'form_kwargs': dict(
             label=_("Minimum length of invoice number after prefix"),
             help_text=_("The part of your invoice number after your prefix will be filled up with leading zeros up to this length, e.g. INV-001 or INV-00001."),
+            required=True,
         )
     },
     'invoice_numbers_consecutive': {
@@ -506,6 +538,7 @@ DEFAULTS = {
                 MinValueValidator(12),
                 MaxValueValidator(64),
             ],
+            required=True,
             widget=forms.NumberInput(
                 attrs={
                     'min': '12',
@@ -520,9 +553,15 @@ DEFAULTS = {
         'type': int,
         'form_class': forms.IntegerField,
         'serializer_class': serializers.IntegerField,
+        'serializer_kwargs': dict(
+            min_value=0,
+            max_value=60 * 24 * 7,
+        ),
         'form_kwargs': dict(
             min_value=0,
+            max_value=60 * 24 * 7,
             label=_("Reservation period"),
+            required=True,
             help_text=_("The number of minutes the items in a user's cart are reserved for this user."),
         )
     },
@@ -577,6 +616,7 @@ DEFAULTS = {
         'form_kwargs': dict(
             label=_("Set payment term"),
             widget=forms.RadioSelect,
+            required=True,
             choices=(
                 ('days', _("in days")),
                 ('minutes', _("in minutes"))
@@ -1091,9 +1131,13 @@ DEFAULTS = {
         'type': int,
         'serializer_class': serializers.IntegerField,
         'form_class': forms.IntegerField,
+        'serializer_kwargs': dict(
+            min_value=1,
+        ),
         'form_kwargs': dict(
             label=_("Waiting list response time"),
             min_value=1,
+            required=True,
             help_text=_("If a ticket voucher is sent to a person on the waiting list, it has to be redeemed within this "
                         "number of hours until it expires and can be re-assigned to the next person on the list."),
             widget=forms.NumberInput(),
@@ -1153,7 +1197,20 @@ DEFAULTS = {
             help_text=_("If you ask for a phone number, explain why you do so and what you will use the phone number for.")
         )
     },
-
+    'show_checkin_number_user': {
+        'default': 'False',
+        'type': bool,
+        'serializer_class': serializers.BooleanField,
+        'form_class': forms.BooleanField,
+        'form_kwargs': dict(
+            label=_("Show number of check-ins to customer"),
+            help_text=_('With this option enabled, your customers will be able how many times they entered '
+                        'the event. This is usually not necessary, but might be useful in combination with tickets '
+                        'that are usable a specific number of times, so customers can see how many times they have '
+                        'already been used. Exits or failed scans will not be counted, and the user will not see '
+                        'the different check-in lists.'),
+        )
+    },
     'ticket_download': {
         'default': 'False',
         'type': bool,
@@ -1512,6 +1569,17 @@ DEFAULTS = {
         ),
         'serializer_class': serializers.URLField,
     },
+    'privacy_url': {
+        'default': None,
+        'type': str,
+        'form_class': forms.URLField,
+        'form_kwargs': dict(
+            label=_("Privacy Policy URL"),
+            help_text=_("This should point e.g. to a part of your website that explains how you use data gathered in "
+                        "your ticket shop."),
+        ),
+        'serializer_class': serializers.URLField,
+    },
     'confirm_texts': {
         'default': LazyI18nStringList(),
         'type': LazyI18nStringList,
@@ -1545,6 +1613,32 @@ DEFAULTS = {
             help_text=_("If enabled, we will attach an .ics calendar file to order confirmation emails."),
         )
     },
+    'mail_attach_ical_paid_only': {
+        'default': 'False',
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Attach calendar files only after order has been paid"),
+            help_text=_("Use this if you e.g. put a private access link into the calendar file to make sure people only "
+                        "receive it after their payment was confirmed."),
+        )
+    },
+    'mail_attach_ical_description': {
+        'default': '',
+        'type': LazyI18nString,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_("Event description"),
+            widget=I18nTextarea,
+            help_text=_(
+                "You can use this to share information with your attendees, such as travel information or the link to a digital event. "
+                "If you keep it empty, we will put a link to the event shop, the admission time, and your organizer name in there. "
+                "We do not allow using placeholders with sensitive person-specific data as calendar entries are often shared with an "
+                "unspecified number of people."
+            ),
+        )
+    },
     'mail_prefix': {
         'default': None,
         'type': str,
@@ -1561,7 +1655,7 @@ DEFAULTS = {
         'type': str
     },
     'mail_from': {
-        'default': settings.MAIL_FROM,
+        'default': settings.MAIL_FROM_ORGANIZERS,
         'type': str,
         'form_class': forms.EmailField,
         'serializer_class': serializers.EmailField,
@@ -1676,6 +1770,30 @@ You can change your order details and view the status of your order at
 Best regards,
 Your {event} team"""))
     },
+    'mail_attachment_new_order': {
+        'default': None,
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Attachment for new orders'),
+            ext_whitelist=(".pdf",),
+            max_size=settings.FILE_UPLOAD_MAX_SIZE_EMAIL_AUTO_ATTACHMENT,
+            help_text=_('This file will be attached to the first email that we send for every new order. Therefore it will be '
+                        'combined with the "Placed order", "Free order", or "Received order" texts from above. It will be sent '
+                        'to both order contacts and attendees. You can use this e.g. to send your terms of service. Do not use '
+                        'it to send non-public information as this file might be sent before payment is confirmed or the order '
+                        'is approved. To avoid this vital email going to spam, you can only upload PDF files of up to {size} MB.').format(
+                size=settings.FILE_UPLOAD_MAX_SIZE_EMAIL_AUTO_ATTACHMENT // (1024 * 1024),
+            )
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'application/pdf'
+            ],
+            max_size=settings.FILE_UPLOAD_MAX_SIZE_EMAIL_AUTO_ATTACHMENT,
+        )
+    },
     'mail_send_order_placed_attendee': {
         'type': bool,
         'default': 'False'
@@ -1798,6 +1916,8 @@ Your {event} team"""))
 
 your order {code} for {event} has been canceled.
 
+{comment}
+
 You can view the details of your order at
 {url}
 
@@ -2489,6 +2609,77 @@ Your {organizer} team"""))
                         'many years. If you keep it empty, gift cards do not have an explicit expiry date.'),
         )
     },
+    'cookie_consent': {
+        'default': 'False',
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Enable cookie consent management features"),
+        ),
+        'type': bool,
+    },
+    'cookie_consent_dialog_text': {
+        'default': LazyI18nString.from_gettext(gettext_noop(
+            'By clicking "Accept all cookies", you agree to the storing of cookies and use of similar technologies on '
+            'your device.'
+        )),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_("Dialog text"),
+            widget=I18nTextarea,
+            widget_kwargs={'attrs': {'rows': '3', 'data-display-dependency': '#id_settings-cookie_consent'}},
+        )
+    },
+    'cookie_consent_dialog_text_secondary': {
+        'default': LazyI18nString.from_gettext(gettext_noop(
+            'We use cookies and similar technologies to gather data that allows us to improve this website and our '
+            'offerings. If you do not agree, we will only use cookies if they are essential to providing the services '
+            'this website offers.'
+        )),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_("Secondary dialog text"),
+            widget=I18nTextarea,
+            widget_kwargs={'attrs': {'rows': '3', 'data-display-dependency': '#id_settings-cookie_consent'}},
+        )
+    },
+    'cookie_consent_dialog_title': {
+        'default': LazyI18nString.from_gettext(gettext_noop('Privacy settings')),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_('Dialog title'),
+            widget=I18nTextInput,
+            widget_kwargs={'attrs': {'data-display-dependency': '#id_settings-cookie_consent'}},
+        )
+    },
+    'cookie_consent_dialog_button_yes': {
+        'default': LazyI18nString.from_gettext(gettext_noop('Accept all cookies')),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_('"Accept" button description'),
+            widget=I18nTextInput,
+            widget_kwargs={'attrs': {'data-display-dependency': '#id_settings-cookie_consent'}},
+        )
+    },
+    'cookie_consent_dialog_button_no': {
+        'default': LazyI18nString.from_gettext(gettext_noop('Required cookies only')),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_('"Reject" button description'),
+            widget=I18nTextInput,
+            widget_kwargs={'attrs': {'data-display-dependency': '#id_settings-cookie_consent'}},
+        )
+    },
     'seating_choice': {
         'default': 'True',
         'form_class': forms.BooleanField,

src/pretix/base/shredder.py

@@ -34,7 +34,6 @@
 
 import json
 import os
-from datetime import timedelta
 from typing import List, Tuple
 
 from django.db import transaction
@@ -70,11 +69,11 @@ def shred_constraints(event: Event):
             max_fromto=Greatest(Max('date_to'), Max('date_from'))
         )
         max_date = max_date['max_fromto'] or max_date['max_to'] or max_date['max_from']
-        if max_date is not None and max_date > now() - timedelta(days=30):
+        if max_date is not None and max_date >= now():
-            return _('Your event needs to be over for at least 30 days to use this feature.')
+            return _('Your event needs to be over to use this feature.')
     else:
-        if (event.date_to or event.date_from) > now() - timedelta(days=30):
+        if (event.date_to or event.date_from) >= now():
-            return _('Your event needs to be over for at least 30 days to use this feature.')
+            return _('Your event needs to be over to use this feature.')
     if event.live:
         return _('Your ticket shop needs to be offline to use this feature.')
     return None

src/pretix/base/signals.py

@@ -399,7 +399,10 @@ order_modified = EventPluginSignal()
 Arguments: ``order``
 
 This signal is sent out every time an order's information is modified. The order object is given
-as the first argument.
+as the first argument. In contrast to ``order_changed``, this signal is sent out if information
+of an order or any of it's position is changed that concerns user input, such as attendee names,
+invoice addresses or question answers. If the order changes in a material way, such as changed
+products, prices, or tax rates, ``order_changed`` is used instead.
 
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """
@@ -409,7 +412,10 @@ order_changed = EventPluginSignal()
 Arguments: ``order``
 
 This signal is sent out every time an order's content is changed. The order object is given
-as the first argument.
+as the first argument. In contrast to ``modified``, this signal is sent out if the order or
+any of its positions changes in a material way, such as changed products, prices, or tax rates,
+``order_changed`` is used instead. If "only" user input is changed, such as attendee names,
+invoice addresses or question answers, ``order_modified`` is used instead.
 
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """

src/pretix/base/templates/pretixbase/email/base.html

@@ -85,9 +85,6 @@
             -webkit-hyphens: auto;
             hyphens: auto;
         }
-        p:last-child {
-            margin-bottom: 0;
-        }
 
         .footer {
             padding: 10px;
@@ -116,6 +113,9 @@
             width: 100%;
             height: auto;
         }
+        .content {
+            text-align: left;
+        }
 
         .content table {
             width: 100%;
@@ -142,7 +142,8 @@
         }
 
         .order-button {
-            padding-top: 5px
+            padding-top: 5px;
+            text-align: center;
         }
         .order-button a.button {
             font-size: 12px;
@@ -173,7 +174,7 @@
             body {
                 direction: rtl;
             }
-            .content table td {
+            .content {
                 text-align: right;
             }
         {% endif %}

src/pretix/base/templates/pretixbase/email/order_details.html

@@ -1,5 +1,6 @@
 {% load eventurl %}
 {% load i18n %}
+{% load oneline %}
 
 {% if position %}
     <div class="order-info">
@@ -89,13 +90,16 @@
                         {% for groupkey, positions in cart %}
                             <tr>
                                 <td>
-                                    {% if not groupkey.4 %} {# is addon #}
+                                    {% if not groupkey.4 %} {# is not addon #}
                                         {{ positions|length }}x
                                     {% endif %}
                                 </td>
                                 <td>
                                     {% if groupkey.4 %} {# is addon #}
                                         +
+                                        {% if positions|length > 1 %}
+                                            {{ positions|length }}x
+                                        {% endif %}
                                     {% endif %}
                                     {{ groupkey.0.name }}{% if groupkey.1 %} – {{ groupkey.1.value }}{% endif %}
                                     {% if groupkey.2 %} {# subevent #}
@@ -107,6 +111,10 @@
                                         {% if event.settings.show_times %}
                                             {{ groupkey.2.date_from|date:"TIME_FORMAT" }}
                                         {% endif %}
+                                        {% if groupkey.2.location %}
+                                            <br>
+                                            {{ groupkey.2.location|oneline }}
+                                        {% endif %}
                                     {% endif %}
                                     {% if groupkey.3 %} {# attendee name #}
                                         <br>

src/pretix/base/templates/pretixbase/email/simple_logo.html

@@ -104,9 +104,6 @@
             -webkit-hyphens: auto;
             hyphens: auto;
         }
-        p:last-child {
-            margin-bottom: 0;
-        }
 
         .footer {
             padding: 10px;
@@ -136,6 +133,10 @@
             display: block;
         }
 
+        .content {
+            text-align: left;
+        }
+
         .content table {
             width: 100%;
         }
@@ -197,7 +198,7 @@
             body {
                 direction: rtl;
             }
-            .content table td {
+            .content {
                 text-align: right;
             }
         {% endif %}

src/pretix/base/templates/pretixbase/redirect.html

@@ -0,0 +1,26 @@
+{% extends "error.html" %}
+{% load i18n %}
+{% load rich_text %}
+{% load static %}
+{% block title %}{% trans "Redirect" %}{% endblock %}
+{% block content %}
+<i class="fa fa-link fa-fw big-icon"></i>
+<div class="error-details">
+    <h1>{% trans "Redirect" %}</h1>
+    <h3>
+        {% blocktrans trimmed with host="<strong>"|add:hostname|add:"</strong>"|safe %}
+        The link you clicked on wants to redirect you to a destination on the website {{ host }}.
+        {% endblocktrans %}
+        {% blocktrans trimmed %}
+        Please only proceed if you trust this website to be safe.
+        {% endblocktrans %}
+    </h3>
+    <p>
+        <a href="{{ url }}" class="btn btn-primary btn-lg">
+            {% blocktrans trimmed with host=hostname %}
+            Proceed to {{ host }}
+            {% endblocktrans %}
+        </a>
+    </p>
+</div>
+{% endblock %}

src/pretix/base/templatetags/oneline.py

@@ -0,0 +1,31 @@
+#
+# 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 import template
+
+register = template.Library()
+
+
+@register.filter
+def oneline(value):
+    if not value:
+        return ''
+    return ', '.join([l.strip() for l in str(value).splitlines() if l and l.strip()])

src/pretix/base/templatetags/rich_text.py

@@ -138,7 +138,7 @@ def truelink_callback(attrs, new=False):
     text = re.sub(r'[^a-zA-Z0-9.\-/_ ]', '', attrs.get('_text'))  # clean up link text
     url = attrs.get((None, 'href'), '/')
     href_url = urllib.parse.urlparse(url)
-    if URL_RE.match(text) and href_url.scheme not in ('tel', 'mailto'):
+    if (None, 'href') in attrs and URL_RE.match(text) and href_url.scheme not in ('tel', 'mailto'):
         # link text looks like a url
         if text.startswith('//'):
             text = 'https:' + text
@@ -157,6 +157,8 @@ def abslink_callback(attrs, new=False):
     Makes sure that all links will be absolute links and will be opened in a new page with no
     window.opener attribute.
     """
+    if (None, 'href') not in attrs:
+        return attrs
     url = attrs.get((None, 'href'), '/')
     if not url.startswith('mailto:') and not url.startswith('tel:'):
         attrs[None, 'href'] = urllib.parse.urljoin(settings.SITE_URL, url)

src/pretix/base/views/errors.py

@@ -30,67 +30,85 @@ from django.utils.translation import gettext as _
 from django.views.decorators.csrf import requires_csrf_token
 from sentry_sdk import last_event_id
 
+from pretix.base.i18n import language
+from pretix.base.middleware import get_language_from_request
+
 
 def csrf_failure(request, reason=""):
-    t = get_template('csrffail.html')
+    try:
-    c = {
+        locale = get_language_from_request(request)
-        'reason': reason,
+    except:
-        'no_referer': reason == REASON_NO_REFERER,
+        locale = "en"
-        'no_referer1': _(
+    with language(locale):  # Middleware might not have run, need to do this manually
-            "You are seeing this message because this HTTPS site requires a "
+        t = get_template('csrffail.html')
-            "'Referer header' to be sent by your Web browser, but none was "
+        c = {
-            "sent. This header is required for security reasons, to ensure "
+            'reason': reason,
-            "that your browser is not being hijacked by third parties."),
+            'no_referer': reason == REASON_NO_REFERER,
-        'no_referer2': _(
+            'no_referer1': _(
-            "If you have configured your browser to disable 'Referer' headers, "
+                "You are seeing this message because this HTTPS site requires a "
-            "please re-enable them, at least for this site, or for HTTPS "
+                "'Referer header' to be sent by your Web browser, but none was "
-            "connections, or for 'same-origin' requests."),
+                "sent. This header is required for security reasons, to ensure "
-        'no_cookie': reason == REASON_NO_CSRF_COOKIE,
+                "that your browser is not being hijacked by third parties."),
-        'no_cookie1': _(
+            'no_referer2': _(
-            "You are seeing this message because this site requires a CSRF "
+                "If you have configured your browser to disable 'Referer' headers, "
-            "cookie when submitting forms. This cookie is required for "
+                "please re-enable them, at least for this site, or for HTTPS "
-            "security reasons, to ensure that your browser is not being "
+                "connections, or for 'same-origin' requests."),
-            "hijacked by third parties."),
+            'no_cookie': reason == REASON_NO_CSRF_COOKIE,
-        'no_cookie2': _(
+            'no_cookie1': _(
-            "If you have configured your browser to disable cookies, please "
+                "You are seeing this message because this site requires a CSRF "
-            "re-enable them, at least for this site, or for 'same-origin' "
+                "cookie when submitting forms. This cookie is required for "
-            "requests."),
+                "security reasons, to ensure that your browser is not being "
-    }
+                "hijacked by third parties."),
-    return HttpResponseForbidden(t.render(c), content_type='text/html')
+            'no_cookie2': _(
+                "If you have configured your browser to disable cookies, please "
+                "re-enable them, at least for this site, or for 'same-origin' "
+                "requests."),
+        }
+        return HttpResponseForbidden(t.render(c), content_type='text/html')
 
 
 @requires_csrf_token
 def page_not_found(request, exception):
-    exception_repr = exception.__class__.__name__
-    # Try to get an "interesting" exception message, if any (and not the ugly
-    # Resolver404 dictionary)
     try:
-        message = exception.args[0]
+        locale = get_language_from_request(request)
-    except (AttributeError, IndexError):
+    except:
-        pass
+        locale = "en"
-    else:
+    with language(locale):  # Middleware might not have run, need to do this manually
-        if isinstance(message, (str, Promise)):
+        exception_repr = exception.__class__.__name__
-            exception_repr = str(message)
+        # Try to get an "interesting" exception message, if any (and not the ugly
-    context = {
+        # Resolver404 dictionary)
-        'request_path': request.path,
+        try:
-        'exception': exception_repr,
+            message = exception.args[0]
-    }
+        except (AttributeError, IndexError):
-    template = get_template('404.html')
+            pass
-    body = template.render(context, request)
+        else:
-    r = HttpResponseNotFound(body)
+            if isinstance(message, (str, Promise)):
-    r.xframe_options_exempt = True
+                exception_repr = str(message)
-    return r
+        context = {
+            'request_path': request.path,
+            'exception': exception_repr,
+        }
+        template = get_template('404.html')
+        body = template.render(context, request)
+        r = HttpResponseNotFound(body)
+        r.xframe_options_exempt = True
+        return r
 
 
 @requires_csrf_token
 def server_error(request):
     try:
-        template = loader.get_template('500.html')
+        locale = get_language_from_request(request)
-    except TemplateDoesNotExist:
+    except:
-        return HttpResponseServerError('<h1>Server Error (500)</h1>', content_type='text/html')
+        locale = "en"
-    r = HttpResponseServerError(template.render({
+    with language(locale):  # Middleware might not have run, need to do this manually
-        'request': request,
+        try:
-        'sentry_event_id': last_event_id(),
+            template = loader.get_template('500.html')
-    }))
+        except TemplateDoesNotExist:
-    r.xframe_options_exempt = True
+            return HttpResponseServerError('<h1>Server Error (500)</h1>', content_type='text/html')
-    return r
+        r = HttpResponseServerError(template.render({
+            'request': request,
+            'sentry_event_id': last_event_id(),
+        }))
+        r.xframe_options_exempt = True
+        return r

src/pretix/base/views/mixins.py

@@ -58,7 +58,7 @@ class BaseQuestionsViewMixin:
     def _positions_for_questions(self):
         raise NotImplementedError()
 
-    def get_question_override_sets(self, position):
+    def get_question_override_sets(self, position, index):
         return []
 
     def question_form_kwargs(self, cr):
@@ -72,7 +72,7 @@ class BaseQuestionsViewMixin:
         submitted at once.
         """
         formlist = []
-        for cr in self._positions_for_questions:
+        for idx, cr in enumerate(self._positions_for_questions):
             cartpos = cr if isinstance(cr, CartPosition) else None
             orderpos = cr if isinstance(cr, OrderPosition) else None
 
@@ -96,7 +96,7 @@ class BaseQuestionsViewMixin:
                 ))
             )
 
-            override_sets = self.get_question_override_sets(cr)
+            override_sets = self.get_question_override_sets(cr, idx)
             for overrides in override_sets:
                 for question_name, question_field in form.fields.items():
                     if hasattr(question_field, 'question'):
@@ -355,20 +355,29 @@ class OrderQuestionsViewMixin(BaseQuestionsViewMixin):
                 override[k].pop('initial', None)
         return override_sets
 
+    @cached_property
+    def vat_id_validation_enabled(self):
+        return any([p.item.tax_rule and (p.item.tax_rule.eu_reverse_charge or p.item.tax_rule.custom_rules)
+                    for p in self.positions])
+
     @cached_property
     def invoice_form(self):
         if not self.address_asked and self.request.event.settings.invoice_name_required:
             f = self.invoice_name_form_class(
                 data=self.request.POST if self.request.method == "POST" else None,
                 event=self.request.event,
-                instance=self.invoice_address, validate_vat_id=False,
+                instance=self.invoice_address,
+                validate_vat_id=False,
+                request=self.request,
                 all_optional=self.all_optional
             )
         elif self.address_asked:
             f = self.invoice_form_class(
                 data=self.request.POST if self.request.method == "POST" else None,
                 event=self.request.event,
-                instance=self.invoice_address, validate_vat_id=False,
+                instance=self.invoice_address,
+                validate_vat_id=self.vat_id_validation_enabled,
+                request=self.request,
                 all_optional=self.all_optional,
             )
         else:

src/pretix/base/views/redirect.py

@@ -23,15 +23,38 @@ import urllib.parse
 
 from django.core import signing
 from django.http import HttpResponseBadRequest, HttpResponseRedirect
+from django.shortcuts import render
 from django.urls import reverse
 
 
+def _is_samesite_referer(request):
+    referer = request.META.get('HTTP_REFERER')
+    if referer is None:
+        return False
+
+    referer = urllib.parse.urlparse(referer)
+
+    # Make sure we have a valid URL for Referer.
+    if '' in (referer.scheme, referer.netloc):
+        return False
+
+    return (referer.scheme, referer.netloc) == (request.scheme, request.get_host())
+
+
 def redir_view(request):
     signer = signing.Signer(salt='safe-redirect')
     try:
         url = signer.unsign(request.GET.get('url', ''))
     except signing.BadSignature:
         return HttpResponseBadRequest('Invalid parameter')
+
+    if not _is_samesite_referer(request):
+        u = urllib.parse.urlparse(url)
+        return render(request, 'pretixbase/redirect.html', {
+            'hostname': u.hostname,
+            'url': url,
+        })
+
     r = HttpResponseRedirect(url)
     r['X-Robots-Tag'] = 'noindex'
     return r

src/pretix/base/views/tasks.py

@@ -205,6 +205,8 @@ class AsyncFormView(AsyncMixin, FormView):
     Also, all form keyword arguments except ``instance`` need to be serializable.
     """
     known_errortypes = ['ValidationError']
+    expected_exceptions = (ValidationError,)
+    task_base = ProfiledEventTask
 
     def __init_subclass__(cls):
         def async_execute(self, *, request_path, query_string, form_kwargs, locale, tz, organizer=None, event=None, user=None, session_key=None):
@@ -222,7 +224,7 @@ class AsyncFormView(AsyncMixin, FormView):
             elif organizer:
                 view_instance.request.organizer = organizer
             if user:
-                view_instance.request.user = User.objects.get(pk=user)
+                view_instance.request.user = User.objects.get(pk=user) if isinstance(user, int) else user
             if session_key:
                 engine = import_module(settings.SESSION_ENGINE)
                 self.SessionStore = engine.SessionStore
@@ -231,7 +233,7 @@ class AsyncFormView(AsyncMixin, FormView):
             with translation.override(locale), timezone.override(pytz.timezone(tz)):
                 form_class = view_instance.get_form_class()
                 if form_kwargs.get('instance'):
-                    cls.model.objects.get(pk=form_kwargs['instance'])
+                    form_kwargs['instance'] = cls.model.objects.get(pk=form_kwargs['instance'])
 
                 form_kwargs = view_instance.get_async_form_kwargs(form_kwargs, organizer, event)
                 form = form_class(**form_kwargs)
@@ -239,10 +241,10 @@ class AsyncFormView(AsyncMixin, FormView):
                 return view_instance.async_form_valid(self, form)
 
         cls.async_execute = app.task(
-            base=ProfiledEventTask,
+            base=cls.task_base,
             bind=True,
             name=cls.__module__ + '.' + cls.__name__ + '.async_execute',
-            throws=(ValidationError,)
+            throws=cls.expected_exceptions
         )(async_execute)
 
     def async_form_valid(self, task, form):