Try to debug flaky test

Currently translated at 100.0% (3996 of 3996 strings)

Translation: pretix/pretix
Translate-URL: https://translate.pretix.eu/projects/pretix/pretix/de_Informal/

powered by weblate

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,23 @@
+---
+name: Bug report
+about: Please only create issues for bug reports. Feature requests or general questions
+  should start as a "Discussion" on GitHub.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please only create issues for bug reports. Feature requests or general questions should start as a "Discussion" on GitHub. -->
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/workflows/docs.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Install system packages
         run: sudo apt update && sudo apt install enchant hunspell aspell-en
       - name: Install Dependencies
-        run: pip3 install --no-use-pep517 -Ur doc/requirements.txt
+        run: pip3 install -Ur doc/requirements.txt
       - name: Spellcheck docs
         run: make spelling
         working-directory: ./doc

.github/workflows/strings.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Install system packages
         run: sudo apt update && sudo apt install gettext
       - name: Install Dependencies
-        run: pip3 install --no-use-pep517 -Ur src/requirements.txt
+        run: pip3 install -Ur src/requirements.txt
       - name: Compile messages
         run: python manage.py compilemessages
         working-directory: ./src
@@ -56,7 +56,7 @@ jobs:
       - name: Install system packages
         run: sudo apt update && sudo apt install enchant hunspell hunspell-de-de aspell-en aspell-de
       - name: Install Dependencies
-        run: pip3 install --no-use-pep517 -Ur src/requirements/dev.txt
+        run: pip3 install -Ur src/requirements/dev.txt
       - name: Spellcheck translations
         run: potypo
         working-directory: ./src

.github/workflows/style.yml

@@ -29,7 +29,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install Dependencies
-        run: pip3 install --no-use-pep517 -Ur src/requirements/dev.txt
+        run: pip3 install -Ur src/requirements/dev.txt
       - name: Run isort
         run: isort -c .
         working-directory: ./src
@@ -49,7 +49,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install Dependencies
-        run: pip3 install -r src/requirements.txt --no-use-pep517 -Ur src/requirements/dev.txt
+        run: pip3 install -r src/requirements.txt -Ur src/requirements/dev.txt
       - name: Run flake8
         run: flake8 .
         working-directory: ./src

.github/workflows/tests.yml

@@ -57,7 +57,7 @@ jobs:
       - name: Install system dependencies
         run: sudo apt update && sudo apt install gettext mysql-client
       - name: Install Python dependencies
-        run: pip3 install -r src/requirements.txt --no-use-pep517 -Ur src/requirements/dev.txt mysqlclient psycopg2-binary
+        run: pip3 install -r src/requirements.txt -Ur src/requirements/dev.txt mysqlclient psycopg2-binary
       - name: Run checks
         run: python manage.py check
         working-directory: ./src

deployment/docker/supervisord/base.conf

@@ -2,9 +2,8 @@
 file=/tmp/supervisor.sock
 
 [supervisord]
-logfile=/tmp/supervisord.log
-logfile_maxbytes=50MB
-logfile_backups=10
+logfile=/dev/stdout
+logfile_maxbytes=0
 loglevel=info
 pidfile=/tmp/supervisord.pid
 nodaemon=false

deployment/docker/supervisord/nginx.conf

@@ -3,5 +3,7 @@ command=/usr/sbin/nginx
 autostart=true
 autorestart=true
 priority=10
-stdout_events_enabled=true
-stderr_events_enabled=true
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/fd/2
+stderr_logfile_maxbytes=0

deployment/docker/supervisord/pretixtask.conf

@@ -4,3 +4,7 @@ autostart=true
 autorestart=true
 priority=5
 user=pretixuser
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/fd/2
+stderr_logfile_maxbytes=0

deployment/docker/supervisord/pretixweb.conf

@@ -5,3 +5,7 @@ autorestart=true
 priority=5
 user=pretixuser
 environment=HOME=/pretix
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/fd/2
+stderr_logfile_maxbytes=0

doc/admin/installation/docker_smallscale.rst

@@ -135,7 +135,7 @@ Fill the configuration file ``/etc/pretix/pretix.cfg`` with the following conten
     user=pretix
     ; Replace with the password you chose above
     password=*********
-    ; In most docker setups, 172.17.0.1 is the address of the docker host. Adjuts
+    ; In most docker setups, 172.17.0.1 is the address of the docker host. Adjust
     ; this to wherever your database is running, e.g. the name of a linked container
     ; or of a mounted MySQL socket.
     host=172.17.0.1

doc/admin/maintainance.rst

@@ -95,6 +95,12 @@ pretix_model_instances
     the ``model`` name. Starting with pretix 3.11, these numbers might only be approximate for
     most tables when running on PostgreSQL to mitigate performance impact.
 
+pretix_celery_tasks_queued_count
+    The number of background tasks in the worker queue, labeled with ``queue``.
+
+pretix_celery_tasks_queued_age_seconds
+    The age of the longest-waiting in the worker queue in seconds, labeled with ``queue``.
+
 .. _metric types: https://prometheus.io/docs/concepts/metric_types/
 .. _Prometheus: https://prometheus.io/
 .. _cProfile: https://docs.python.org/3/library/profile.html

doc/api/fundamentals.rst

@@ -183,6 +183,9 @@ Relative date         *either* String in ISO 8601  ``"2017-12-27"``,
                       constructed from a number of
                       days before the base point
                       and the base point.
+File                  URL in responses, ``file:``  ``"https://…"``, ``"file:…"``
+                      specifiers in requests
+                      (see below).
 ===================== ============================ ===================================
 
 Query parameters
@@ -227,4 +230,48 @@ We store idempotency keys for 24 hours, so you should never retry a request afte
 All ``POST``, ``PUT``, ``PATCH``, or ``DELETE`` api calls support idempotency keys. Adding an idempotency key to a
 ``GET``, ``HEAD``, or ``OPTIONS`` request has no effect.
 
+
+File upload
+-----------
+
+In some places, the API supports working with files, for example when setting the picture of a product. In this case,
+you will first need to make a separate request to our file upload endpoint:
+
+.. sourcecode:: http
+
+   POST /api/v1/upload HTTP/1.1
+   Host: pretix.eu
+   Authorization: Token e1l6gq2ye72thbwkacj7jbri7a7tvxe614ojv8ybureain92ocub46t5gab5966k
+   Content-Type: image/png
+   Content-Disposition: attachment; filename="logo.png"
+   Content-Length: 1234
+
+   <raw file content>
+
+Note that the ``Content-Type`` and ``Content-Disposition`` headers are required. If the upload was successful, you will
+receive a JSON response with the ID of the file:
+
+.. sourcecode:: http
+
+   HTTP/1.1 201 Created
+   Content-Type: application/json
+
+   {
+     "id": "file:1cd99455-1ebd-4cda-b1a2-7a7d2a969ad1"
+   }
+
+You can then use this file ID in the request you want to use it in. File IDs are currently valid for 24 hours and can only
+be used using the same authorization method and user that was used to upload them.
+
+.. sourcecode:: http
+
+   PATCH /api/v1/organizers/test/events/test/items/3/ HTTP/1.1
+   Host: pretix.eu
+   Content-Type: application/json
+
+   {
+     "picture": "file:1cd99455-1ebd-4cda-b1a2-7a7d2a969ad1"
+   }
+
+
 .. _CSRF policies: https://docs.djangoproject.com/en/1.11/ref/csrf/#ajax

doc/api/guides/index.rst

@@ -8,4 +8,5 @@ This part of the documentation contains how-to guides on some special use cases
 .. toctree::
    :maxdepth: 2
 
+   order_lifecycle
    custom_checkout

doc/api/guides/order_lifecycle.rst

@@ -0,0 +1,56 @@
+Understanding the life cycle of orders
+======================================
+
+When integrating pretix with other systems, it is important that you understand how orders and related objects
+such as order positions, fees, payments, refunds, and invoices work together, in order to react to their changes
+properly and map them to processes in your system.
+
+Order states
+------------
+
+Generally, an order can be in six states. For compatibility reasons, the ``status`` field only allows four values
+and the two remaining states are modeled through the ``require_approval`` field and the number of positions within
+an order. The states and their allowed changes are shown in the following graph:
+
+.. image:: /images/order_states.png
+
+
+Object types
+------------
+
+Order
+    One order represents one purchase. It's the main object you interact with and bundles all the other objects
+    together. Orders can change in many ways during their lifetime, but will never be deleted (unless ``testmode``
+    is set to ``true``).
+
+Order position
+    An order position represents one product contained in the order. Orders can usually have multiple positions.
+    There might be a parent-child relation between order positions if one position is an add-on to another position.
+    Order positions can change in many ways during their lifetime, and can also be removed or added to an order.
+
+Order fees
+    A fee represents a charge that is not related to a product. Examples include shipping fees, service fees, and
+    cancellation fees.
+    Order fees can change in many ways during their lifetime, and can also be removed or added to an order.
+
+Order payment
+    An order payment represents one payment attempt with a specific payment method and amount. An order can have
+    multiple payments attached.
+    Order payments have their own state diagram. Apart from their state and their meta information (e.g. used
+    credit card, …) they usually don't change. They may be added at any time, but will never be deleted.
+
+Order refund
+    An order payment represents one refund attempt with a specific payment method and amount. An order can have
+    multiple refunds attached.
+    Order refunds have their own state diagram. Apart from their state and their meta information (e.g. used
+    credit card, …) they usually don't change. They may be added at any time, but will never be deleted.
+
+Invoice
+    An invoice represents a legal document stating the contents of an order. While the backend technically allows
+    to update an invoice in some situations, invoices are generally considered immutable. Once they are issued,
+    they no longer change. If the order changes substantially (e.g. prices change), an invoice is canceled through
+    creation of a new invoice with the opposite amount, plus the issuance of a new invoice.
+
+Here's an example of how they all play together:
+
+.. image:: /images/order_objects.png

doc/api/resources/carts.rst

@@ -42,10 +42,6 @@ seat                                  objects                    The assigned se
 └ seat_guid                           string                     Identifier of the seat within the seating plan
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.17
-
-   This resource has been added.
-
 .. versionchanged:: 3.0
 
    This ``seat`` attribute has been added.

doc/api/resources/categories.rst

@@ -25,14 +25,6 @@ is_addon                              boolean                    If ``true``, it
                                                                  defining add-ons for other products.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.14
-
-   The operations POST, PATCH, PUT and DELETE have been added.
-
-.. versionchanged:: 1.16
-
-   The field ``internal_name`` has been added.
-
 
 Endpoints
 ---------

doc/api/resources/checkinlists.rst

@@ -36,22 +36,6 @@ rules                                 object                     Custom check-in
 exit_all_at                           datetime                   Automatically check out (i.e. perform an exit scan) at this point in time. After this happened, this property will automatically be set exactly one day into the future. Note that this field is considered "internal configuration" and if you pull the list with ``If-Modified-Since``, the daily change in this field will not trigger a response.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.10
-
-   This resource has been added.
-
-.. versionchanged:: 1.11
-
-   The ``positions`` endpoints have been added.
-
-.. versionchanged:: 1.13
-
-   The ``include_pending`` field has been added.
-
-.. versionchanged:: 3.2
-
-    The ``auto_checkin_sales_channels`` field has been added.
-
 .. versionchanged:: 3.9
 
     The ``subevent`` attribute may now be ``null`` inside event series. The ``allow_multiple_entries``,
@@ -68,10 +52,6 @@ exit_all_at                           datetime                   Automatically c
 Endpoints
 ---------
 
-.. versionchanged:: 1.15
-
-   The ``../status/`` detail endpoint has been added.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/checkinlists/
 
    Returns a list of all check-in lists within a given event.
@@ -380,29 +360,6 @@ Endpoints
 Order position endpoints
 ------------------------
 
-.. versionchanged:: 1.15
-
-   The order positions endpoint has been extended by the filter queries ``item__in``, ``variation__in``,
-   ``order__status__in``, ``subevent__in``, ``addon_to__in``, and ``search``. The search for attendee names and order
-   codes is now case-insensitive.
-
-   The ``.../redeem/`` endpoint has been added.
-
-.. versionchanged:: 2.0
-
-   The order positions endpoint has been extended by the filter queries ``voucher`` and ``voucher__code``.
-
-.. versionchanged:: 2.7
-
-   The resource now contains the new attributes ``require_attention`` and ``order__status`` and accepts the new
-   ``ignore_status`` filter. The ``attendee_name`` field is now "smart" (see below) and the redemption endpoint
-   returns ``400`` instead of ``404`` on tickets which are known but not paid.
-
-.. versionchanged:: 3.2
-
-    The ``checkins`` dict now also contains a ``auto_checked_in`` value to indicate if the check-in has been performed
-    automatically by the system.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/checkinlists/(list)/positions/
 
    Returns a list of all order positions within a given event. The result is the same as

doc/api/resources/events.rst

@@ -52,31 +52,6 @@ sales_channels                        list                       A list of sales
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 1.7
-
-   The ``meta_data`` field has been added.
-
-.. versionchanged:: 1.15
-
-   The ``plugins`` field has been added.
-   The operations POST, PATCH, PUT and DELETE have been added.
-
-.. versionchanged:: 2.1
-
-   Filters have been added to the list of events.
-
-.. versionchanged:: 2.5
-
-   The ``testmode`` attribute has been added.
-
-.. versionchanged:: 2.8
-
-    When cloning events, the ``testmode`` attribute will now be cloned, too.
-
-.. versionchanged:: 3.0
-
-   The attributes ``seating_plan`` and ``seat_category_mapping`` have been added.
-
 .. versionchanged:: 3.3
 
    The attributes ``geo_lat`` and ``geo_lon`` have been added.

doc/api/resources/invoices.rst

@@ -46,24 +46,6 @@ internal_reference                    string                     Customer's refe
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 1.6
-
-   The attribute ``invoice_no`` has been dropped in favor of ``number`` which includes the number including the prefix,
-   since the prefix can now vary. Also, invoices now need to be identified by their ``number`` instead of the raw
-   number.
-
-
-.. versionchanged:: 1.7
-
-   The attributes ``lines.tax_name``, ``foreign_currency_display``, ``foreign_currency_rate``, and
-   ``foreign_currency_rate_date`` have been added.
-
-
-.. versionchanged:: 1.9
-
-   The attribute ``internal_reference`` has been added.
-
-
 .. versionchanged:: 3.4
 
    The attribute ``lines.number`` has been added.

doc/api/resources/item_add-ons.rst

@@ -28,10 +28,6 @@ multi_allowed                         boolean                    Adding the same
 price_included                        boolean                    Adding this add-on to the item is free
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.12
-
-   This resource has been added.
-
 Endpoints
 ---------
 

doc/api/resources/item_bundles.rst

@@ -30,10 +30,6 @@ designated_price                      money (string)             Designated pric
                                                                  taxation. This is not added to the price.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 2.6
-
-   This resource has been added.
-
 Endpoints
 ---------
 

doc/api/resources/item_variations.rst

@@ -26,14 +26,6 @@ description                           multi-lingual string       A public descri
 position                              integer                    An integer, used for sorting
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 2.7
-
-   The attribute ``original_price`` has been added.
-
-.. versionchanged:: 1.12
-
-   This resource has been added.
-
 Endpoints
 ---------
 

doc/api/resources/items.rst

@@ -36,8 +36,8 @@ admission                             boolean                    ``true`` for it
                                                                  (such as primary tickets) and ``false`` for others
                                                                  (such as add-ons or merchandise).
 position                              integer                    An integer, used for sorting
-picture                               string                     A product picture to be displayed in the shop
-                                                                 (read-only, can be ``null``).
+picture                               file                       A product picture to be displayed in the shop
+                                                                 (can be ``null``).
 sales_channels                        list of strings            Sales channels this product is available on, such as
                                                                  ``"web"`` or ``"resellers"``. Defaults to ``["web"]``.
 available_from                        datetime                   The first date time at which this item can be bought
@@ -118,44 +118,6 @@ bundles                               list of objects            Definition of b
 meta_data                             object                     Values set for event-specific meta data parameters.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 2.7
-
-   The attribute ``original_price`` has been added for ``variations``.
-
-.. versionchanged:: 1.7
-
-   The attribute ``tax_rule`` has been added. ``tax_rate`` is kept for compatibility. The attribute
-   ``checkin_attention`` has been added.
-
-.. versionchanged:: 1.12
-
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
-   The attribute ``price_included`` has been added to ``addons``.
-
-.. versionchanged:: 1.16
-
-   The ``internal_name`` and ``original_price`` fields have been added.
-
-.. versionchanged:: 2.0
-
-   The field ``require_approval`` has been added.
-
-.. versionchanged:: 2.3
-
-   The ``sales_channels`` attribute has been added.
-
-.. versionchanged:: 2.4
-
-   The ``generate_tickets`` attribute has been added.
-
-.. versionchanged:: 2.6
-
-   The ``bundles`` and ``require_bundling`` attributes have been added.
-
-.. versionchanged:: 3.0
-
-   The ``show_quota_left``, ``allow_waitinglist``, and ``hidden_if_available`` attributes have been added.
-
 .. versionchanged:: 3.7
 
    The attribute ``meta_data`` has been added.

doc/api/resources/orders.rst

@@ -94,60 +94,6 @@ last_modified                         datetime                   Last modificati
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 1.6
-
-   The ``invoice_address.country`` attribute contains a two-letter country code for all new orders. For old orders,
-   a custom text might still be returned.
-
-.. versionchanged:: 1.7
-
-   The attributes ``invoice_address.vat_id_validated`` and ``invoice_address.is_business`` have been added.
-   The attributes ``order.payment_fee``, ``order.payment_fee_tax_rate`` and ``order.payment_fee_tax_value`` have been
-   deprecated in favor of the new ``fees`` attribute but will still be served and removed in 1.9.
-
-.. versionchanged:: 1.9
-
-   First write operations (``…/mark_paid/``, ``…/mark_pending/``, ``…/mark_canceled/``, ``…/mark_expired/``) have been added.
-   The attribute ``invoice_address.internal_reference`` has been added.
-
-.. versionchanged:: 1.13
-
-   The field ``checkin_attention`` has been added.
-
-.. versionchanged:: 1.15
-
-   The attributes ``order.payment_fee``, ``order.payment_fee_tax_rate``, ``order.payment_fee_tax_value`` and
-   ``order.payment_fee_tax_rule`` have finally been removed.
-
-.. versionchanged:: 1.16
-
-   The attributes ``order.last_modified`` as well as the corresponding filters to the resource have been added.
-   An endpoint for order creation as well as ``…/mark_refunded/`` has been added.
-
-.. versionchanged:: 2.0
-
-   The ``order.payment_date`` and ``order.payment_provider`` attributes have been deprecated in favor of the new
-   nested ``payments`` and ``refunds`` resources, but will still be served and removed in 2.2. The ``require_approval``
-   attribute has been added, as have been the ``…/approve/`` and ``…/deny/`` endpoints.
-
-.. versionchanged:: 2.3
-
-   The ``sales_channel`` attribute has been added.
-
-.. versionchanged:: 2.4
-
-   ``order.status`` can no longer be ``r``, ``…/mark_canceled/`` now accepts a ``cancellation_fee`` parameter and
-   ``…/mark_refunded/`` has been deprecated.
-
-.. versionchanged:: 2.5
-
-   The ``testmode`` attribute has been added and ``DELETE`` has been implemented for orders.
-
-.. versionchanged:: 3.1
-
-   The ``invoice_address.state`` and ``url`` attributes have been added. When creating orders through the API,
-   vouchers are now supported and many fields are now optional.
-
 .. versionchanged:: 3.5
 
    The ``order.fees.canceled`` attribute has been added.
@@ -220,7 +166,7 @@ downloads                             list of objects            List of ticket
 └ url                                 string                     Download URL
 answers                               list of objects            Answers to user-defined questions
 ├ question                            integer                    Internal ID of the answered question
-├ answer                              string                     Text representation of the answer
+├ answer                              string                     Text representation of the answer (URL if answer is a file)
 ├ question_identifier                 string                     The question's ``identifier`` field
 ├ options                             list of integers           Internal IDs of selected option(s)s (only for choice types)
 └ option_identifiers                  list of strings            The ``identifier`` fields of the selected option(s)s
@@ -233,30 +179,6 @@ pdf_data                              object                     Data object req
                                                                  ``pdf_data=true`` query parameter to your request.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.7
-
-   The attribute ``tax_rule`` has been added.
-
-.. versionchanged:: 1.11
-
-   The attribute ``checkins.list`` has been added.
-
-.. versionchanged:: 1.14
-
-  The attributes ``answers.question_identifier`` and ``answers.option_identifiers`` have been added.
-
-.. versionchanged:: 1.16
-
-  The attributes ``pseudonymization_id`` and ``pdf_data`` have been added.
-
-.. versionchanged:: 3.0
-
-  The attribute ``seat`` has been added.
-
-.. versionchanged:: 3.2
-
-  The value ``auto_checked_in`` has been added to the ``checkins``-attribute.
-
 .. versionchanged:: 3.3
 
   The ``url`` of a ticket ``download`` can now also return a ``text/uri-list`` instead of a file. See
@@ -274,6 +196,10 @@ pdf_data                              object                     Data object req
 
   The ``checkin.type`` attribute has been added.
 
+.. versionchanged:: 3.16
+
+   Answers to file questions are now returned as an URL.
+
 .. _order-payment-resource:
 
 Order payment resource
@@ -302,14 +228,6 @@ details                               object                     Payment-specifi
                                                                  the object is empty.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 2.0
-
-  This resource has been added.
-
-.. versionchanged:: 3.1
-
-  The attributes ``payment_url`` and ``details`` have been added.
-
 .. _order-refund-resource:
 
 Order refund resource
@@ -325,21 +243,14 @@ state                                 string                     Payment state,
 source                                string                     How this refund has been created, one of ``buyer``, ``admin``, or ``external``
 amount                                money (string)             Payment amount
 created                               datetime                   Date and time of creation of this payment
-payment_date                          datetime                   Date and time of completion of this payment (or ``null``)
+comment                               string                     Reason for refund (shown to the customer in some cases, can be ``null``).
+execution_date                        datetime                   Date and time of completion of this refund (or ``null``)
 provider                              string                     Identification string of the payment provider
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 2.0
-
-  This resource has been added.
-
 List of all orders
 ------------------
 
-.. versionchanged:: 1.15
-
-   Filtering for emails or order codes is now case-insensitive.
-
 .. versionchanged:: 3.5
 
    The ``include_canceled_positions`` and ``include_canceled_fees`` query parameters have been added.
@@ -1445,21 +1356,6 @@ Sending e-mails
 List of all order positions
 ---------------------------
 
-.. versionchanged:: 1.15
-
-   The order positions endpoint has been extended by the filter queries ``item__in``, ``variation__in``,
-   ``order__status__in``, ``subevent__in``, ``addon_to__in`` and ``search``. The search for attendee names and order
-   codes is now case-insensitive.
-
-.. versionchanged:: 2.0
-
-   The order positions endpoint has been extended by the filter queries ``voucher``, ``voucher__code`` and
-   ``pseudonymization_id``.
-
-.. versionchanged:: 3.2
-
-  The value ``auto_checked_in`` has been added to the ``checkins``-attribute.
-
 .. versionchanged:: 3.5
 
    The ``include_canceled_positions`` and ``include_canceled_fees`` query parameters have been added.
@@ -1706,6 +1602,67 @@ Order position ticket download
 Manipulating individual positions
 ---------------------------------
 
+.. versionchanged:: 3.15
+
+   The ``PATCH`` method has been added for individual positions.
+
+.. http:patch:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
+
+   Updates specific fields on an order position. Currently, only the following fields are supported:
+
+   * ``attendee_email``
+
+   * ``attendee_name_parts`` or ``attendee_name``
+
+   * ``company``
+
+   * ``street``
+
+   * ``zipcode``
+
+   * ``city``
+
+   * ``country``
+
+   * ``state``
+
+   * ``answers``: If specified, you will need to provide **all** answers for this order position.
+     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.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/orderpositions/23442/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "attendee_email": "other@example.org"
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      (Full order resource, see above.)
+
+   :param organizer: The ``slug`` field of the organizer of the event
+   :param event: The ``slug`` field of the event
+   :param id: The ``id`` field of the order position 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.
+
 .. http:delete:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/(id)/
 
    Deletes an order position, identified by its internal ID.
@@ -1738,10 +1695,6 @@ Manipulating individual positions
 Order payment endpoints
 -----------------------
 
-.. versionchanged:: 2.0
-
-  These endpoints have been added.
-
 .. versionchanged:: 3.6
 
    Payments can now be created through the API.
@@ -2021,10 +1974,6 @@ Order payment endpoints
 Order refund endpoints
 ----------------------
 
-.. versionchanged:: 2.0
-
-  These endpoints have been added.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/refunds/
 
    Returns a list of all refunds for an order.
@@ -2058,6 +2007,7 @@ Order refund endpoints
             "payment": 1,
             "created": "2017-12-01T10:00:00Z",
             "execution_date": "2017-12-04T12:13:12Z",
+            "comment": "Cancellation",
             "provider": "banktransfer"
           }
         ]
@@ -2100,6 +2050,7 @@ Order refund endpoints
         "payment": 1,
         "created": "2017-12-01T10:00:00Z",
         "execution_date": "2017-12-04T12:13:12Z",
+        "comment": "Cancellation",
         "provider": "banktransfer"
       }
 
@@ -2134,6 +2085,7 @@ Order refund endpoints
         "amount": "23.00",
         "payment": 1,
         "execution_date": null,
+        "comment": "Cancellation",
         "provider": "manual",
         "mark_canceled": false,
         "mark_pending": true
@@ -2155,6 +2107,7 @@ Order refund endpoints
         "payment": 1,
         "created": "2017-12-01T10:00:00Z",
         "execution_date": null,
+        "comment": "Cancellation",
         "provider": "manual"
       }
 

doc/api/resources/question_options.rst

@@ -19,10 +19,6 @@ identifier                            string                     An arbitrary st
 answer                                multi-lingual string       The displayed value of this option
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.12
-
-   This resource has been added.
-
 Endpoints
 ---------
 

doc/api/resources/questions.rst

@@ -75,28 +75,6 @@ dependency_value                      string                     An old version
                                                                  for one value. **Deprecated.**
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.12
-
-  The values ``D``, ``H``, and ``W`` for the field ``type`` are now allowed and the ``ask_during_checkin`` field has
-  been added.
-
-.. versionchanged:: 1.14
-
-  Write methods have been added. The attribute ``identifier`` has been added to both the resource itself and the
-  options resource. The ``position`` attribute has been added to the options resource.
-
-.. versionchanged:: 2.7
-
-  The attribute ``hidden`` and the question type ``CC`` have been added.
-
-.. versionchanged:: 3.0
-
-  The attribute ``dependency_values`` has been added.
-
-.. versionchanged:: 3.1
-
-  The attribute ``print_on_invoice`` has been added.
-
 .. versionchanged:: 3.5
 
   The attribute ``help_text`` has been added.

doc/api/resources/quotas.rst

@@ -30,14 +30,6 @@ release_after_exit                    boolean                    Whether the quo
                                                                  have been scanned at an exit.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.10
-
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
-
-.. versionchanged:: 3.0
-
-   The attributes ``close_when_sold_out`` and ``closed`` have been added.
-
 .. versionchanged:: 3.10
 
    The attribute ``release_after_exit`` has been added.

doc/api/resources/seatingplans.rst

@@ -20,10 +20,6 @@ layout                                object                     JSON representa
                                                                  still evolves. The version in use can be found `here`_.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.0
-
-   This endpoint has been added.
-
 Endpoints
 ---------
 

doc/api/resources/subevents.rst

@@ -33,6 +33,7 @@ date_to                               datetime                   The sub-event's
 date_admission                        datetime                   The sub-event's admission date (or ``null``)
 presale_start                         datetime                   The sub-date at which the ticket shop opens (or ``null``)
 presale_end                           datetime                   The sub-date at which the ticket shop closes (or ``null``)
+frontpage_text                        multi-lingual string       The description of the event (or ``null``)
 location                              multi-lingual string       The sub-event location (or ``null``)
 geo_lat                               float                      Latitude of the location (or ``null``)
 geo_lon                               float                      Longitude of the location (or ``null``)
@@ -54,25 +55,6 @@ seat_category_mapping                 object                     An object mappi
 last_modified                         datetime                   Last modification of this object
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.7
-
-   The ``meta_data`` field has been added.
-
-.. versionchanged:: 2.1
-
-   The ``event`` field has been added, together with filters on the list of dates and an organizer-level list.
-
-.. versionchanged:: 2.6
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
-
-.. versionchanged:: 2.7
-
-   The attribute ``is_public`` has been added.
-
-.. versionchanged:: 3.0
-
-   The attributes ``seating_plan`` and ``seat_category_mapping`` have been added.
-
 .. versionchanged:: 3.3
 
    The attributes ``geo_lat`` and ``geo_lon`` have been added.

doc/api/resources/taxrules.rst

@@ -24,14 +24,6 @@ home_country                          string                     Merchant countr
                                                                  ``null`` or empty string
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.7
-
-   This resource has been added.
-
-.. versionchanged:: 1.9
-
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
-
 
 Endpoints
 ---------

doc/api/resources/vouchers.rst

@@ -46,14 +46,6 @@ show_hidden_items                     boolean                    Only if set to
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 1.9
-
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
-
-.. versionchanged:: 3.0
-
-   The attribute ``show_hidden_items`` has been added.
-
 .. versionchanged:: 3.4
 
    The attribute ``seat`` has been added.

doc/development/api/customview.rst

@@ -14,7 +14,9 @@ Control panel views
 -------------------
 
 If you want to add a custom view to the control area of an event, just register an URL in your
-``urls.py`` that lives in the ``/control/`` subpath::
+``urls.py`` that lives in the ``/control/`` subpath:
+
+.. code-block:: python
 
     from django.conf.urls import url
 
@@ -44,7 +46,9 @@ If only the ``organizer`` parameter is present, it will be ensured that:
 * The user has permission to access view the current organizer
 
 If you want to require specific permission types, we provide you with a decorator or a mixin for
-your views::
+your views:
+
+.. code-block:: python
 
     from pretix.control.permissions import (
         event_permission_required, EventPermissionRequiredMixin
@@ -61,8 +65,9 @@ your views::
         ...
 
 Similarly, there is ``organizer_permission_required`` and ``OrganizerPermissionRequiredMixin``. In case of
-event-related views, there is also a signal that allows you to add the view to the event navigation like this::
+event-related views, there is also a signal that allows you to add the view to the event navigation like this:
 
+.. code-block:: python
 
     from django.urls import resolve, reverse
     from django.dispatch import receiver
@@ -90,7 +95,9 @@ Event settings view
 -------------------
 
 A special case of a control panel view is a view hooked into the event settings page. For this case, there is a
-special navigation signal::
+special navigation signal:
+
+.. code-block:: python
 
     @receiver(nav_event_settings, dispatch_uid='friends_tickets_nav_settings')
     def navbar_settings(sender, request, **kwargs):
@@ -105,7 +112,9 @@ special navigation signal::
         }]
 
 Also, your view should inherit from ``EventSettingsViewMixin`` and your template from ``pretixcontrol/event/settings_base.html``
-for good integration. If you just want to display a form, you could do it like the following::
+for good integration. If you just want to display a form, you could do it like the following:
+
+.. code-block:: python
 
     class MySettingsView(EventSettingsViewMixin, EventSettingsFormView):
         model = Event
@@ -147,7 +156,9 @@ Including a custom view into the participant-facing frontend is a little bit dif
 no path prefix like ``control/``.
 
 First, define your URL in your ``urls.py``, but this time in the ``event_patterns`` section and wrapped by
-``event_url``::
+``event_url``:
+
+.. code-block:: python
 
     from pretix.multidomain import event_url
 
@@ -182,8 +193,9 @@ standard Django request handling: There are `ViewSets`_ to group related views i
 automatically build URL configurations from them.
 
 To integrate a custom viewset with pretix' REST API, you can just register with one of our routers within the
-``urls.py`` module of your plugin::
+``urls.py`` module of your plugin:
 
+.. code-block:: python
 
     from pretix.api.urls import event_router, router, orga_router
 
@@ -200,7 +212,9 @@ in the control panel. However, you need to make sure on your own only to return
 .event`` and ``request.organizer`` are available as usual.
 
 To require a special permission like ``can_view_orders``, you do not need to inherit from a special ViewSet base
-class, you can just set the ``permission`` attribute on your viewset::
+class, you can just set the ``permission`` attribute on your viewset:
+
+.. code-block:: python
 
     class MyViewSet(ModelViewSet):
         permission = 'can_view_orders'
@@ -208,8 +222,9 @@ class, you can just set the ``permission`` attribute on your viewset::
 
 If you want to check the permission only for some methods of your viewset, you have to do it yourself. Note here that
 API authentications can be done via user sessions or API tokens and you should therefore check something like the
-following::
+following:
 
+.. code-block:: python
 
     perm_holder = (request.auth if isinstance(request.auth, TeamAPIToken) else request.user)
     if perm_holder.has_event_permission(request.event.organizer, request.event, 'can_view_orders'):

doc/development/api/email.rst

@@ -15,7 +15,9 @@ Output registration
 The email HTML renderer API does not make a lot of usage from signals, however, it
 does use a signal to get a list of all available email renderers. Your plugin
 should listen for this signal and return the subclass of ``pretix.base.email.BaseHTMLMailRenderer``
-that we'll provide in this plugin::
+that we'll provide in this plugin:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 
@@ -72,7 +74,9 @@ class ``TemplateBasedMailRenderer`` that you can re-use to perform the following
 * Call `inlinestyler`_ to convert all ``<style>`` style sheets to inline ``style=""``
   attributes for better compatibility
 
-To use it, you just need to implement some variables::
+To use it, you just need to implement some variables:
+
+.. code-block:: python
 
     class ClassicMailRenderer(TemplateBasedMailRenderer):
         verbose_name = _('pretix default')

doc/development/api/exporter.rst

@@ -17,7 +17,9 @@ Exporter registration
 The exporter API does not make a lot of usage from signals, however, it does use a signal to get a list of
 all available exporters. Your plugin should listen for this signal and return the subclass of
 ``pretix.base.exporter.BaseExporter``
-that we'll provide in this plugin::
+that we'll provide in this plugin:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 
@@ -31,7 +33,9 @@ that we'll provide in this plugin::
 
 Some exporters might also prove to be useful, when provided on an organizer-level. In order to declare your
 exporter as capable of providing exports spanning multiple events, your plugin should listen for this signal
-and return the subclass of ``pretix.base.exporter.BaseExporter`` that we'll provide in this plugin::
+and return the subclass of ``pretix.base.exporter.BaseExporter`` that we'll provide in this plugin:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 

doc/development/api/general.rst

@@ -34,7 +34,7 @@ Frontend
 --------
 
 .. automodule:: pretix.presale.signals
-   :members: html_head, html_footer, footer_link, front_page_top, front_page_bottom, front_page_bottom_widget, fee_calculation_for_cart, contact_form_fields, question_form_fields, contact_form_fields_overrides, question_form_fields_overrides, checkout_confirm_messages, checkout_confirm_page_content, checkout_all_optional, html_page_header, sass_preamble, sass_postamble, render_seating_plan, checkout_flow_steps, position_info, position_info_top, item_description, global_html_head, global_html_footer, global_html_page_header
+   :members: html_head, html_footer, footer_link, global_footer_link, front_page_top, front_page_bottom, front_page_bottom_widget, fee_calculation_for_cart, contact_form_fields, question_form_fields, contact_form_fields_overrides, question_form_fields_overrides, checkout_confirm_messages, checkout_confirm_page_content, checkout_all_optional, html_page_header, sass_preamble, sass_postamble, render_seating_plan, checkout_flow_steps, position_info, position_info_top, item_description, global_html_head, global_html_footer, global_html_page_header
 
 
 .. automodule:: pretix.presale.signals
@@ -79,7 +79,7 @@ Ticket designs
 """"""""""""""
 
 .. automodule:: pretix.base.signals
-   :members: layout_text_variables
+   :members: layout_text_variables, layout_image_variables
 
 .. automodule:: pretix.plugins.ticketoutputpdf.signals
    :members: override_layout

doc/development/api/invoice.rst

@@ -15,7 +15,9 @@ Output registration
 The invoice renderer API does not make a lot of usage from signals, however, it
 does use a signal to get a list of all available invoice renderers. Your plugin
 should listen for this signal and return the subclass of ``pretix.base.invoice.BaseInvoiceRenderer``
-that we'll provide in this plugin::
+that we'll provide in this plugin:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 

doc/development/api/payment.rst

@@ -19,7 +19,9 @@ Provider registration
 The payment provider API does not make a lot of usage from signals, however, it
 does use a signal to get a list of all available payment providers. Your plugin
 should listen for this signal and return the subclass of ``pretix.base.payment.BasePaymentProvider``
-that the plugin will provide::
+that the plugin will provide:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 
@@ -104,14 +106,22 @@ The provider class
 
    .. automethod:: payment_control_render
 
+   .. automethod:: payment_control_render_short
+
    .. automethod:: payment_refund_supported
 
    .. automethod:: payment_partial_refund_supported
 
+   .. automethod:: payment_presale_render
+
    .. automethod:: execute_refund
 
    .. automethod:: refund_control_render
 
+   .. automethod:: new_refund_control_form_render
+
+   .. automethod:: new_refund_control_form_process
+
    .. automethod:: api_payment_details
 
    .. automethod:: matching_id
@@ -140,7 +150,9 @@ it is necessary to introduce additional views. One example is the PayPal
 provider. It redirects the user to a PayPal website in the
 :py:meth:`BasePaymentProvider.checkout_prepare` step of the checkout process
 and provides PayPal with a URL to redirect back to. This URL points to a
-view which looks roughly like this::
+view which looks roughly like this:
+
+.. code-block:: python
 
     @login_required
     def success(request):

doc/development/api/placeholder.rst

@@ -13,7 +13,9 @@ Placeholder registration
 
 The placeholder API does not make a lot of usage from signals, however, it
 does use a signal to get a list of all available email placeholders. Your plugin
-should listen for this signal and return an instance of a subclass of ``pretix.base.email.BaseMailTextPlaceholder``::
+should listen for this signal and return an instance of a subclass of ``pretix.base.email.BaseMailTextPlaceholder``:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 
@@ -71,7 +73,9 @@ Helper class for simple placeholders
 ------------------------------------
 
 pretix ships with a helper class that makes it easy to provide placeholders based on simple
-functions::
+functions:
+
+.. code-block:: python
 
      placeholder = SimpleFunctionalMailTextPlaceholder(
          'code', ['order'], lambda order: order.code, sample='F8VVL'

doc/development/api/plugins.rst

@@ -55,7 +55,9 @@ restricted         boolean (optional)   ``False`` by default, restricts a plugin
 compatibility      string               Specifier for compatible pretix versions.
 ================== ==================== ===========================================================
 
-A working example would be::
+A working example would be:
+
+.. code-block:: python
 
     try:
         from pretix.base.plugins import PluginConfig
@@ -81,7 +83,7 @@ A working example would be::
 
     default_app_config = 'pretix_paypal.PaypalApp'
 
-The ``AppConfig`` class may implement a property ``compatiblity_errors``, that checks
+The ``AppConfig`` class may implement a property ``compatibility_errors``, that checks
 whether the pretix installation meets all requirements of the plugin. If so,
 it should contain ``None`` or an empty list, otherwise a list of strings containing
 human-readable error messages. We recommend using the ``django.utils.functional.cached_property``
@@ -96,7 +98,9 @@ Plugin registration
 
 Somehow, pretix needs to know that your plugin exists at all. For this purpose, we
 make use of the `entry point`_ feature of setuptools. To register a plugin that lives
-in a separate python package, your ``setup.py`` should contain something like this::
+in a separate python package, your ``setup.py`` should contain something like this:
+
+.. code-block:: python
 
     setup(
         args...,
@@ -118,7 +122,9 @@ The various components of pretix define a number of signals which your plugin ca
 listen for. We will go into the details of the different signals in the following
 pages. We suggest that you put your signal receivers into a ``signals`` submodule
 of your plugin. You should extend your ``AppConfig`` (see above) by the following
-method to make your receivers available::
+method to make your receivers available:
+
+.. code-block:: python
 
     class PaypalApp(AppConfig):
         …
@@ -127,7 +133,9 @@ method to make your receivers available::
             from . import signals  # NOQA
 
 You can optionally specify code that is executed when your plugin is activated for an event
-in the ``installed`` method::
+in the ``installed`` method:
+
+.. code-block:: python
 
     class PaypalApp(AppConfig):
         …

doc/development/api/shredder.rst

@@ -74,7 +74,7 @@ looks like this:
 
         def generate_files(self) -> List[Tuple[str, str, str]]:
             yield 'invoice-addresses.json', 'application/json', json.dumps({
-                ia.order.code: InvoiceAdddressSerializer(ia).data
+                ia.order.code: InvoiceAddressSerializer(ia).data
                 for ia in InvoiceAddress.objects.filter(order__event=self.event)
             }, indent=4)
 

doc/development/api/ticketoutput.rst

@@ -17,7 +17,9 @@ Output registration
 The ticket output API does not make a lot of usage from signals, however, it
 does use a signal to get a list of all available ticket outputs. Your plugin
 should listen for this signal and return the subclass of ``pretix.base.ticketoutput.BaseTicketOutput``
-that we'll provide in this plugin::
+that we'll provide in this plugin:
+
+.. code-block:: python
 
     from django.dispatch import receiver
 

doc/development/concepts.rst

@@ -82,11 +82,15 @@ Orders
 ^^^^^^
 
 If a customer completes the checkout process, an **Order** will be created containing all the entered information.
-An order can be in one of currently four states that are listed in the diagram below:
+An order can be in one of currently six states that are listed in the diagram below:
 
 .. image:: /images/order_states.png
 
-There are additional "fake" states that are displayed like states but not represented as states in the system:
+The dotted lines represent status changes that usually do not happen as part of the regular process, but can be
+performed manually in the admin backend.
+
+For historical reasons, there are only four valid values of the ``status`` field, and the two additional states are
+represented differently:
 
 * An order is considered **canceled (with paid fee)** if it is in **paid** status but does not include any non-cancelled positions.
 

doc/development/implementation/background.rst

@@ -12,7 +12,9 @@ Implementing a task
 -------------------
 
 A common pattern for implementing asynchronous tasks can be seen a lot in ``pretix.base.services``
-and looks like this::
+and looks like this:
+
+.. code-block:: python
 
     from pretix.celery_app import app
 
@@ -34,13 +36,15 @@ If your user needs to wait for the response of the asynchronous task, there are
 that will probably move to ``pretix.base`` at some point. They consist of the view mixin ``AsyncAction`` that allows
 you to easily write a view that kicks off and waits for an asynchronous task. ``AsyncAction`` will determine whether
 to run the task asynchronously or not and will do some magic to look nice for users with and without JavaScript support.
-A usage example taken directly from the code is::
+A usage example taken directly from the code is:
+
+.. code-block:: python
 
     class OrderCancelDo(EventViewMixin, OrderDetailMixin, AsyncAction, View):
         """
         A view that executes a task asynchronously. A POST request will kick off the
         task into the background or run it in the foreground if celery is not installed.
-        In the former case, subsequent GET calls can be used to determinine the current
+        In the former case, subsequent GET calls can be used to determine the current
         status of the task.
         """
 
@@ -79,7 +83,9 @@ A usage example taken directly from the code is::
             return super().get_error_message(exception)
 
 On the client side, this can be used by simply adding a ``data-asynctask`` attribute to an HTML form. This will enable
-AJAX sending of the form and display a loading indicator::
+AJAX sending of the form and display a loading indicator:
+
+.. code-block:: html
 
     <form method="post" data-asynctask
           action="{% eventurl request.event "presale:event.order.cancel.do" … %}">

doc/development/implementation/i18n.rst

@@ -27,7 +27,9 @@ numbers and dates, ``LazyDate`` and ``LazyNumber``. There also is a ``LazyLocale
 exceptions with gettext-localized exception messages.
 
 Last, but definitely not least, we have the ``language`` context manager (``pretix.base.i18n.language``) that allows
-you to execute a piece of code with a different locale::
+you to execute a piece of code with a different locale:
+
+.. code-block:: python
 
     with language('de'):
         render_mail_template()

doc/development/implementation/logging.rst

@@ -16,7 +16,9 @@ We recommend all relevant models to inherit from ``LoggedModel`` as it simplifie
 .. autoclass:: pretix.base.models.LoggedModel
    :members: log_action, all_logentries
 
-To actually log an action, you can just call the ``log_action`` method on your object::
+To actually log an action, you can just call the ``log_action`` method on your object:
+
+.. code-block:: python
 
    order.log_action('pretix.event.order.canceled', user=user, data={})
 
@@ -29,7 +31,9 @@ Logging form actions
 """"""""""""""""""""
 
 A very common use case is to log the changes to a model that have been done in a ``ModelForm``. In this case,
-we generally use a custom ``form_valid`` method on our ``FormView`` that looks like this::
+we generally use a custom ``form_valid`` method on our ``FormView`` that looks like this:
+
+.. code-block:: python
 
     @transaction.atomic
     def form_valid(self, form):
@@ -40,7 +44,9 @@ we generally use a custom ``form_valid`` method on our ``FormView`` that looks l
         messages.success(self.request, _('Your changes have been saved.'))
         return super().form_valid(form)
 
-It gets a little bit more complicated if your form allows file uploads::
+It gets a little bit more complicated if your form allows file uploads:
+
+.. code-block:: python
 
     @transaction.atomic
     def form_valid(self, form):
@@ -67,7 +73,9 @@ following ready-to-include template::
 
 We now need a way to translate the action codes like ``pretix.event.changed`` into human-readable
 strings. The :py:attr:`pretix.base.signals.logentry_display` signals allows you to do so. A simple
-implementation could look like::
+implementation could look like:
+
+.. code-block:: python
 
     from django.utils.translation import gettext as _
     from pretix.base.signals import logentry_display
@@ -88,7 +96,9 @@ Sending notifications
 
 If you think that the logged information might be important or urgent enough to send out a notification to interested
 organizers. In this case, you should listen for the :py:attr:`pretix.base.signals.register_notification_types` signal
-to register a notification type::
+to register a notification type:
+
+.. code-block:: python
 
     @receiver(register_notification_types)
     def register_my_notification_types(sender, **kwargs):
@@ -103,7 +113,9 @@ You should subclass the base ``NotificationType`` class and implement all its me
 .. autoclass:: pretix.base.notifications.NotificationType
    :members: action_type, verbose_name, required_permission, build_notification
 
-A simple implementation could look like this::
+A simple implementation could look like this:
+
+.. code-block:: python
 
     class MyNotificationType(NotificationType):
         required_permission = "can_view_orders"
@@ -143,7 +155,9 @@ Logging technical information
 -----------------------------
 
 If you just want to log technical information to a log file on disk that does not need to be parsed
-and displayed later, you can just use Python's ``logging`` module::
+and displayed later, you can just use Python's ``logging`` module:
+
+.. code-block:: python
 
    import logging
 
@@ -151,7 +165,9 @@ and displayed later, you can just use Python's ``logging`` module::
 
    logger.info('Startup complete.')
 
-This is also very useful to provide debugging information when an exception occurs::
+This is also very useful to provide debugging information when an exception occurs:
+
+.. code-block:: python
 
    try:
       foo()

doc/development/implementation/permissions.rst

@@ -15,7 +15,9 @@ Requiring permissions for a view
 --------------------------------
 
 pretix provides a number of useful mixins and decorators that allow you to specify that a user needs a certain
-permission level to access a view::
+permission level to access a view:
+
+.. code-block:: python
 
     from pretix.control.permissions import (
         OrganizerPermissionRequiredMixin, organizer_permission_required
@@ -44,7 +46,9 @@ permission level to access a view::
         # Only users with *any* permission on this organizer can access this
 
 
-Of course, the same is available on event level::
+Of course, the same is available on event level:
+
+.. code-block:: python
 
     from pretix.control.permissions import (
         EventPermissionRequiredMixin, event_permission_required
@@ -73,7 +77,9 @@ Of course, the same is available on event level::
         # Only users with *any* permission on this event can access this
 
 You can also require that this view is only accessible by system administrators with an active "admin session"
-(see below for what this means)::
+(see below for what this means):
+
+.. code-block:: python
 
     from pretix.control.permissions import (
         AdministratorPermissionRequiredMixin, administrator_permission_required
@@ -89,7 +95,9 @@ You can also require that this view is only accessible by system administrators
         # ...
 
 In rare cases it might also be useful to expose a feature only to people who have a staff account but do not
-necessarily have an active admin session::
+necessarily have an active admin session:
+
+.. code-block:: python
 
     from pretix.control.permissions import (
         StaffMemberRequiredMixin, staff_member_required

doc/development/implementation/settings.rst

@@ -39,7 +39,9 @@ subclass that also adds support for internationalized fields:
 
 .. autoclass:: pretix.base.forms.SettingsForm
 
-You can simply use it like this::
+You can simply use it like this:
+
+.. code-block:: python
 
    class EventSettingsForm(SettingsForm):
        show_date_to = forms.BooleanField(
@@ -56,7 +58,9 @@ You can simply use it like this::
 Defaults in plugins
 -------------------
 
-Plugins can add custom hardcoded defaults in the following way::
+Plugins can add custom hardcoded defaults in the following way:
+
+.. code-block:: python
 
     from pretix.base.settings import settings_hierarkey
 

doc/images/order_objects.puml

@@ -0,0 +1,34 @@
+@startuml
+
+participant User
+collections "OrderPayment\nOrderRefund" as P
+collections "Order\nOrderPosition" as O
+collections "Invoice\nInvoiceLine" as I
+
+User -> O: Order placed (€100)
+rnote over O #6DD96D: Order A1B2C\nstatus = **n**\ntotal = €100
+O -> P: Payment created
+O -> I: Invoice created\n(can also happen later)
+rnote over I #6DD96D: Invoice 00001\n€100
+rnote over P #6DD96D: OrderPayment A1B2C-P-1\nstate = **created**
+P -> User: Payment details (web, email)
+User -> P: Payment performed
+rnote over P #EFF46B: OrderPayment A1B2C-P-1\nstate = **confirmed**
+P -> O: Order marked as paid
+rnote over O #EFF46B: Order A1B2C\nstatus = **p**\ntotal = €100
+User -> O: Data change (e.g. invoice address)
+O -> I: Invoice reissued
+rnote over I #6DD96D: Invoice 00002\n€-100
+rnote over I #6DD96D: Invoice 00003\n€100
+rnote over O #EFF46B: Order A1B2C\nstatus = **p**\ntotal = €100
+User -> O: Order canceled
+rnote over O #EFF46B: Order A1B2C\nstatus = **c**
+O -> I: Invoice canceled
+rnote over I #6DD96D: Invoice 00004\n€-100
+O -> P: Refund started
+rnote over P #6DD96D: OrderRefund\nA1B2C-R-1\nstate = **created**
+P -> User: Money sent
+rnote over P #EFF46B: OrderRefund\nA1B2C-R-1\nstate = **done**
+
+@enduml
+

doc/images/order_states.puml

@@ -1,19 +1,39 @@
 @startuml
 
-Pending: Order is expecting payment\nOrder reduces quotas
-Expired: Payment period is over\nOrder does not affect quotas
-Paid: Order was successful\nOrder reduces quotas
-Canceled: Order has been canceled\nOrder does not affect quotas
+state "Approval Pending" as AP
+state "Canceled (with paid fee)" as CP
+AP: status = "n"
+AP: require_approval = true
+Pending: status = "n"
+Pending: require_approval = false
+Pending: Tickets reserved: yes
+Expired: status = "e"
+Expired: Tickets reserved: no
+Paid: status = "p"
+Paid: count(positions | !canceled) > 0
+Paid: Tickets reserved: yes
+CP: status = "p"
+CP: count(positions | !canceled) = 0
+Canceled: status = "c"
+Canceled: Tickets reserved: no
 
-[*] --> Pending: customer\nplaces order
-Pending --> Paid: successful payment
-Pending --> Expired: automatically\nor manually\non admin action
-Expired --> Paid: if payment is received\nonly if quota left
-Expired --> Canceled
-Expired --> Pending: manually\non admin action
-Paid --> Canceled: manually on\nadmin action\nor if an external\npayment provider\nnotifies about a\npayment refund
-Pending --> Canceled: on admin or\ncustomer action
-Paid -> Pending: manually on admin action
-[*] --> Paid: customer\nplaces free order
+
+[*] -> Pending: order placed\ntotal > 0
+[*] -> Paid: order placed\ntotal = 0
+[*] -> AP: order placed\napproval required
+Pending --> Paid: order paid
+Pending --> Expired: after payment\ndeadline
+Expired --> Paid: order paid\n(only if quota left)
+Expired -[dashed]-> Canceled
+Expired -[dashed]-> Pending: order extended
+Paid --> Canceled: order canceled
+Pending --> Canceled: order canceled
+Paid -[dashed]-> Pending: refund
+AP --> Pending: order approved
+AP --> Canceled: order denied
+Paid --> CP: order canceled\n(with cancellation fee)
+Canceled -[dashed]-> Pending: order reactivated
+Canceled -[dashed]-> Paid: order reactivated
+CP -[dashed]-> Canceled: fee canceled
 
 @enduml

doc/plugins/badges.rst

@@ -22,10 +22,6 @@ item_assignments                      list of objects            Products this l
 └ item                                integer                    Item ID
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.16
-
-   This resource has been added.
-
 
 Endpoints
 ---------

doc/plugins/ticketoutputpdf.rst

@@ -24,14 +24,6 @@ item_assignments                      list of objects            Products this l
 └ item                                integer                    Item ID
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 1.16
-
-   This resource has been added.
-
-.. versionchanged:: 2.3
-
-   The ``item_assignments.sales_channel`` field has been added.
-
 
 Endpoints
 ---------

doc/user/events/email.rst

@@ -64,20 +64,35 @@ is valid in every text):
 Placeholder                    Description
 ============================== ===============================================================================
 event                          The event name
+event_slug                     The event's short form
+code                           In case of the waiting list, the voucher code to redeem
+currency                       The currency used for the event (three-letter code)
 total                          The order's total value
 total_with_currency            The order's total value with a localized currency sign
-currency                       The currency used for the event (three-letter code)
+refund_amount                  (For cancellation emails) The amount of money that will be refunded, including
+                               the currency
 payment_info                   Information text specific to the payment method (e.g. banking details)
 url                            An URL pointing to the download/status page of the order
-invoice_name                   The name field of the invoice address
+url_info_change                An URL pointing to the page of the order that can be used to change ticket
+                               information
+url_products_change            An URL pointing to the page of the order that can be used to change the products
+                               in the order
+url_cancel                     An URL pointing to the page of the order that can be used to cancel the order
+name, name_*                   Any name that can be used to address the recipient (e.g. name from invoice address,
+                               name from first ticket, …)
+invoice_name, invoice_name_*   The name field of the invoice address
 invoice_company                The company field of the invoice address
+attendee_name, attendee_name_* The name of the attendee represented by the ticket
 expire_date                    The order's expiration date
+comment                        When rejecting an order, this will contain the reason for the rejection
 date                           The same as ``expire_date``, but in a different e-mail (for backwards
                                compatibility)
 orders                         A list of orders including links to their status pages, specific to the "resend
                                link (requested by user)" e-mail
-code                           In case of the waiting list, the voucher code to redeem
 hours                          In case of the waiting list, the number of hours the voucher code is valid
+product                        In case of the waiting list, the product that has become available
+voucher_list                   When sending out vouchers in bulk, this will be replaced with the list of
+                               vouchers
 ============================== ===============================================================================
 
 The different e-mails are explained in the following:

doc/user/events/widget.rst

@@ -88,6 +88,15 @@ website. If you confident to have a good reason for not using SSL, you can overr
 
    <pretix-widget event="https://pretix.eu/demo/democon/" skip-ssl-check></pretix-widget>
 
+Always open a new tab
+---------------------
+
+If you want the checkout process to always open a new tab regardless of screen size, you can pass the ``disable-iframe``
+attribute::
+
+   <pretix-widget event="https://pretix.eu/demo/democon/" disable-iframe></pretix-widget>
+
+
 Pre-selecting a voucher
 -----------------------
 
@@ -197,7 +206,10 @@ should be added to the cart. The syntax of this attribute is ``item_ITEMID=1,ite
 where ``ITEMID`` are the internal IDs of items to be added and ``VARID`` are the internal IDs of variations of those
 items, if the items have variations. If you omit the ``items`` attribute, the general start page will be presented.
 
-Just as the widget, the button supports the optional attributes ``voucher`` and ``skip-ssl-check``.
+In case you are using an event-series, you will need to specify the subevent for which the item(s) should be put in the
+cart. This can be done by specifying the ``subevent``-attribute.
+
+Just as the widget, the button supports the optional attributes ``voucher``, ``disable-iframe``, and ``skip-ssl-check``.
 
 You can style the button using the ``pretix-button`` CSS class.
 
@@ -304,8 +316,92 @@ Hosted or pretix Enterprise are active, you can pass the following fields:
 * If you use the campaigns plugin, you can pass a campaign ID as a value to ``data-campaign``. This way, all orders
   made through this widget will be counted towards this campaign.
 
-* If you use the tracking plugin, you can pass a Google Analytics User ID to enable cross-domain tracking. This will
-  require you to dynamically load the widget, like this::
+* If you use the tracking plugin, you can enable cross-domain tracking. To do so, you need to initialize the 
+  pretix-widget manually. Use the html code to embed the widget and add one the following code snippets. Make sure to
+  replace all occurrences of <MEASUREMENT_ID> with your Google Analytics MEASUREMENT_ID (UA-XXXXXXX-X or G-XXXXXXXX)
+
+  Please also make sure to add the embedding website to your `Referral exclusions
+  <https://support.google.com/analytics/answer/2795830>`_ in your Google Analytics settings.
+
+  If you use Google Analytics 4 (GA4 – G-XXXXXXXX)::
+
+    <script async src="https://www.googletagmanager.com/gtag/js?id=<MEASUREMENT_ID>"></script>
+    <script type="text/javascript">
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+        gtag('js', new Date());
+        gtag('config', '<MEASUREMENT_ID>');
+
+        window.pretixWidgetCallback = function () {
+            window.PretixWidget.build_widgets = false;
+            window.addEventListener('load', function() { // Wait for GA to be loaded
+                if (!window['google_tag_manager']) {
+                    window.PretixWidget.buildWidgets();
+                    return;
+                }
+
+                var clientId;
+                var sessionId;
+                var loadingTimeout;
+                function build() {
+                    // use loadingTimeout to make sure build() is only called once
+                    if (!loadingTimeout) return;
+                    window.clearTimeout(loadingTimeout);
+                    loadingTimeout = null;
+                    if (clientId) window.PretixWidget.widget_data["tracking-ga-id"] = clientId;
+                    if (sessionId) window.PretixWidget.widget_data["tracking-ga-sessid"] = sessionId;
+                    window.PretixWidget.buildWidgets();
+                };
+                // make sure to build pretix-widgets if gtag fails to load either client_id or session_id
+                loadingTimeout = window.setTimeout(build, 2000);
+
+                gtag('get', '<MEASUREMENT_ID>', 'client_id', function(id) {
+                    clientId = id;
+                    if (sessionId !== undefined) build();
+                });
+                gtag('get', '<MEASUREMENT_ID>', 'session_id', function(id) {
+                    sessionId = id;
+                    if (clientId !== undefined) build();
+                });
+            });
+        };
+    </script>
+
+  If you use Universal Analytics with ``gtag.js`` (UA-XXXXXXX-X)::
+
+    <script async src="https://www.googletagmanager.com/gtag/js?id=<MEASUREMENT_ID>"></script>
+    <script type="text/javascript">
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+        gtag('js', new Date());
+        gtag('config', '<MEASUREMENT_ID>');
+
+        window.pretixWidgetCallback = function () {
+            window.PretixWidget.build_widgets = false;
+            window.addEventListener('load', function() { // Wait for GA to be loaded
+                if (!window['google_tag_manager']) {
+                    window.PretixWidget.buildWidgets();
+                    return;
+                }
+
+                // make sure to build pretix-widgets if gtag fails to load client_id
+                var loadingTimeout = window.setTimeout(function() {
+                    loadingTimeout = null;
+                    window.PretixWidget.buildWidgets();
+                }, 1000);
+
+                gtag('get', '<MEASUREMENT_ID>', 'client_id', function(id) {
+                    if (loadingTimeout) {
+                        window.clearTimeout(loadingTimeout);
+                        window.PretixWidget.widget_data["tracking-ga-id"] = id;
+                        window.PretixWidget.buildWidgets();
+                    }
+                });
+            });
+        };
+    </script>
+
+  If you use ```analytics.js` (Universal Analytics)::
 
     <script>
         (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -313,32 +409,33 @@ Hosted or pretix Enterprise are active, you can pass the following fields:
         m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
         })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
 
-        ga('create', 'UA-XXXXXX-1', 'auto');
+        ga('create', '<MEASUREMENT_ID>', 'auto');
         ga('send', 'pageview');
 
         window.pretixWidgetCallback = function () {
             window.PretixWidget.build_widgets = false;
             window.addEventListener('load', function() { // Wait for GA to be loaded
-                if(window.ga && ga.create) {
-                    ga(function(tracker) {
-                        window.PretixWidget.widget_data["tracking-ga-id"] = tracker.get('clientId');
-                        window.PretixWidget.buildWidgets()
-                    });
-                } else { // Tracking is probably blocked
-                       window.PretixWidget.buildWidgets()
+                if (!window['ga'] || !ga.create) {
+                    // Tracking is probably blocked
+                    window.PretixWidget.buildWidgets()
+                    return;
                 }
+
+                var loadingTimeout = window.setTimeout(function() {
+                    loadingTimeout = null;
+                    window.PretixWidget.buildWidgets();
+                }, 1000);
+                ga(function(tracker) {
+                    if (loadingTimeout) {
+                        window.clearTimeout(loadingTimeout);
+                        window.PretixWidget.widget_data["tracking-ga-id"] = tracker.get('clientId');
+                        window.PretixWidget.buildWidgets();
+                    }
+                });
             });
         };
     </script>
 
-  In some combinations with Google Tag Manager, the widget does not load this way. In this case, try replacing
-  ``tracker.get('clientId')`` with ``ga.getAll()[0].get('clientId')``.
-
-
-.. versionchanged:: 2.3
-
-   Data passing options have been added in pretix 2.3. If you use a self-hosted version of pretix, they only work
-   fully if you configured a redis server.
 
 .. versionchanged:: 3.6
 

src/pretix/__init__.py

@@ -1 +1 @@
-__version__ = "3.14.0"
+__version__ = "3.17.0.dev0"

src/pretix/api/auth/devicesecurity.py

@@ -41,7 +41,9 @@ class PretixScanSecurityProfile(AllowListSecurityProfile):
         ('POST', 'api-v1:checkinlistpos-redeem'),
         ('GET', 'api-v1:revokedsecrets-list'),
         ('GET', 'api-v1:order-list'),
+        ('GET', 'api-v1:orderposition-pdf_image'),
         ('GET', 'api-v1:event.settings'),
+        ('POST', 'api-v1:upload'),
     )
 
 
@@ -67,7 +69,9 @@ class PretixScanNoSyncSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:checkinlist-status'),
         ('POST', 'api-v1:checkinlistpos-redeem'),
         ('GET', 'api-v1:revokedsecrets-list'),
+        ('GET', 'api-v1:orderposition-pdf_image'),
         ('GET', 'api-v1:event.settings'),
+        ('POST', 'api-v1:upload'),
     )
 
 
@@ -95,7 +99,9 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('POST', 'api-v1:order-list'),
         ('GET', 'api-v1:order-detail'),
         ('DELETE', 'api-v1:orderposition-detail'),
+        ('GET', 'api-v1:orderposition-pdf_image'),
         ('POST', 'api-v1:order-mark_canceled'),
+        ('POST', 'api-v1:orderpayment-list'),
         ('POST', 'api-v1:orderrefund-list'),
         ('POST', 'api-v1:orderrefund-done'),
         ('POST', 'api-v1:cartposition-list'),
@@ -113,6 +119,7 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('GET', 'plugins:pretix_seating:event.event.subevent'),
         ('GET', 'plugins:pretix_seating:event.plan'),
         ('GET', 'plugins:pretix_seating:selection.simple'),
+        ('POST', 'api-v1:upload'),
     )
 
 

src/pretix/api/auth/permission.py

@@ -89,10 +89,38 @@ class EventCRUDPermission(EventPermission):
 class ProfilePermission(BasePermission):
 
     def has_permission(self, request, view):
-        if not request.user.is_authenticated:
+        if not request.user.is_authenticated and not isinstance(request.auth, (Device, TeamAPIToken)):
             return False
 
+        if request.user.is_authenticated:
+            try:
+                # If this logic is updated, make sure to also update the logic in pretix/control/middleware.py
+                assert_session_valid(request)
+            except SessionInvalid:
+                return False
+            except SessionReauthRequired:
+                return False
+
         if isinstance(request.auth, OAuthAccessToken):
             if not (request.auth.allow_scopes(['read']) or request.auth.allow_scopes(['profile'])) and request.method in SAFE_METHODS:
                 return False
+
+        return True
+
+
+class AnyAuthenticatedClientPermission(BasePermission):
+
+    def has_permission(self, request, view):
+        if not request.user.is_authenticated and not isinstance(request.auth, (Device, TeamAPIToken)):
+            return False
+
+        if request.user.is_authenticated:
+            try:
+                # If this logic is updated, make sure to also update the logic in pretix/control/middleware.py
+                assert_session_valid(request)
+            except SessionInvalid:
+                return False
+            except SessionReauthRequired:
+                return False
+
         return True

src/pretix/api/serializers/cart.py

@@ -1,5 +1,6 @@
 from datetime import timedelta
 
+from django.core.files import File
 from django.utils.crypto import get_random_string
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy
@@ -100,8 +101,15 @@ class CartPositionCreateSerializer(I18nAwareModelSerializer):
 
         for answ_data in answers_data:
             options = answ_data.pop('options')
-            answ = cp.answers.create(**answ_data)
-            answ.options.add(*options)
+            if isinstance(answ_data['answer'], File):
+                an = answ_data.pop('answer')
+                answ = cp.answers.create(**answ_data, answer='')
+                answ.file.save(an.name, an, save=False)
+                answ.answer = 'file://' + answ.file.name
+                answ.save()
+            else:
+                answ = cp.answers.create(**answ_data)
+                answ.options.add(*options)
         return cp
 
     def validate_cart_id(self, cid):

src/pretix/api/serializers/event.py

@@ -1,25 +1,29 @@
+import logging
+
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.db import transaction
+from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
 from django.utils.translation import gettext as _
 from django_countries.serializers import CountryFieldMixin
-from hierarkey.proxy import HierarkeyProxy
 from pytz import common_timezones
-from rest_framework import serializers
 from rest_framework.fields import ChoiceField, Field
 from rest_framework.relations import SlugRelatedField
 
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
-from pretix.base.models import Event, TaxRule
+from pretix.api.serializers.settings import SettingsSerializer
+from pretix.base.models import Device, Event, TaxRule, TeamAPIToken
 from pretix.base.models.event import SubEvent
 from pretix.base.models.items import SubEventItem, SubEventItemVariation
 from pretix.base.services.seating import (
     SeatProtected, generate_seats, validate_plan_change,
 )
-from pretix.base.settings import DEFAULTS, validate_event_settings
+from pretix.base.settings import validate_event_settings
 from pretix.base.signals import api_event_settings_fields
 
+logger = logging.getLogger(__name__)
+
 
 class MetaDataField(Field):
 
@@ -170,9 +174,12 @@ class EventSerializer(I18nAwareModelSerializer):
         }
 
     def validate_meta_data(self, value):
-        for key in value['meta_data'].keys():
+        for key, v in value['meta_data'].items():
             if key not in self.meta_properties:
                 raise ValidationError(_('Meta data property \'{name}\' does not exist.').format(name=key))
+            if self.meta_properties[key].allowed_values:
+                if v not in [_v.strip() for _v in self.meta_properties[key].allowed_values.splitlines()]:
+                    raise ValidationError(_('Meta data property \'{name}\' does not allow value \'{value}\'.').format(name=key, value=v))
         return value
 
     @cached_property
@@ -219,6 +226,14 @@ class EventSerializer(I18nAwareModelSerializer):
 
         return value
 
+    @cached_property
+    def ignored_meta_properties(self):
+        perm_holder = (self.context['request'].auth if isinstance(self.context['request'].auth, (Device, TeamAPIToken))
+                       else self.context['request'].user)
+        if perm_holder.has_organizer_permission('can_change_organizer_settings', request=self.context['request']):
+            return []
+        return [k for k, p in self.meta_properties.items() if p.protected]
+
     @transaction.atomic
     def create(self, validated_data):
         meta_data = validated_data.pop('meta_data', None)
@@ -234,10 +249,11 @@ class EventSerializer(I18nAwareModelSerializer):
         # Meta data
         if meta_data is not None:
             for key, value in meta_data.items():
-                event.meta_values.create(
-                    property=self.meta_properties.get(key),
-                    value=value
-                )
+                if key not in self.ignored_meta_properties:
+                    event.meta_values.create(
+                        property=self.meta_properties.get(key),
+                        value=value
+                    )
 
         # Item Meta properties
         if item_meta_properties is not None:
@@ -275,19 +291,21 @@ class EventSerializer(I18nAwareModelSerializer):
         if meta_data is not None:
             current = {mv.property: mv for mv in event.meta_values.select_related('property')}
             for key, value in meta_data.items():
-                prop = self.meta_properties.get(key)
-                if prop in current:
-                    current[prop].value = value
-                    current[prop].save()
-                else:
-                    event.meta_values.create(
-                        property=self.meta_properties.get(key),
-                        value=value
-                    )
+                if key not in self.ignored_meta_properties:
+                    prop = self.meta_properties.get(key)
+                    if prop in current:
+                        current[prop].value = value
+                        current[prop].save()
+                    else:
+                        event.meta_values.create(
+                            property=self.meta_properties.get(key),
+                            value=value
+                        )
 
             for prop, current_object in current.items():
-                if prop.name not in meta_data:
-                    current_object.delete()
+                if prop.name not in self.ignored_meta_properties:
+                    if prop.name not in meta_data:
+                        current_object.delete()
 
         # Item Meta properties
         if item_meta_properties is not None:
@@ -391,8 +409,8 @@ class SubEventSerializer(I18nAwareModelSerializer):
         model = SubEvent
         fields = ('id', 'name', 'date_from', 'date_to', 'active', 'date_admission',
                   'presale_start', 'presale_end', 'location', 'geo_lat', 'geo_lon', 'event', 'is_public',
-                  'seating_plan', 'item_price_overrides', 'variation_price_overrides', 'meta_data',
-                  'seat_category_mapping', 'last_modified')
+                  'frontpage_text', 'seating_plan', 'item_price_overrides', 'variation_price_overrides',
+                  'meta_data', 'seat_category_mapping', 'last_modified')
 
     def validate(self, data):
         data = super().validate(data)
@@ -440,11 +458,22 @@ class SubEventSerializer(I18nAwareModelSerializer):
         }
 
     def validate_meta_data(self, value):
-        for key in value['meta_data'].keys():
+        for key, v in value['meta_data'].items():
             if key not in self.meta_properties:
                 raise ValidationError(_('Meta data property \'{name}\' does not exist.').format(name=key))
+            if self.meta_properties[key].allowed_values:
+                if v not in [_v.strip() for _v in self.meta_properties[key].allowed_values.splitlines()]:
+                    raise ValidationError(_('Meta data property \'{name}\' does not allow value \'{value}\'.').format(name=key, value=v))
         return value
 
+    @cached_property
+    def ignored_meta_properties(self):
+        perm_holder = (self.context['request'].auth if isinstance(self.context['request'].auth, (Device, TeamAPIToken))
+                       else self.context['request'].user)
+        if perm_holder.has_organizer_permission('can_change_organizer_settings', request=self.context['request']):
+            return []
+        return [k for k, p in self.meta_properties.items() if p.protected]
+
     @transaction.atomic
     def create(self, validated_data):
         item_price_overrides_data = validated_data.pop('subeventitem_set') if 'subeventitem_set' in validated_data else {}
@@ -461,10 +490,11 @@ class SubEventSerializer(I18nAwareModelSerializer):
         # Meta data
         if meta_data is not None:
             for key, value in meta_data.items():
-                subevent.meta_values.create(
-                    property=self.meta_properties.get(key),
-                    value=value
-                )
+                if key not in self.ignored_meta_properties:
+                    subevent.meta_values.create(
+                        property=self.meta_properties.get(key),
+                        value=value
+                    )
 
         # Seats
         if subevent.seating_plan:
@@ -510,19 +540,21 @@ class SubEventSerializer(I18nAwareModelSerializer):
         if meta_data is not None:
             current = {mv.property: mv for mv in subevent.meta_values.select_related('property')}
             for key, value in meta_data.items():
-                prop = self.meta_properties.get(key)
-                if prop in current:
-                    current[prop].value = value
-                    current[prop].save()
-                else:
-                    subevent.meta_values.create(
-                        property=self.meta_properties.get(key),
-                        value=value
-                    )
+                if key not in self.ignored_meta_properties:
+                    prop = self.meta_properties.get(key)
+                    if prop in current:
+                        current[prop].value = value
+                        current[prop].save()
+                    else:
+                        subevent.meta_values.create(
+                            property=self.meta_properties.get(key),
+                            value=value
+                        )
 
             for prop, current_object in current.items():
-                if prop.name not in meta_data:
-                    current_object.delete()
+                if prop.name not in self.ignored_meta_properties:
+                    if prop.name not in meta_data:
+                        current_object.delete()
 
         # Seats
         if seat_category_mapping is not None or ('seating_plan' in validated_data and validated_data['seating_plan'] is None):
@@ -558,12 +590,13 @@ class TaxRuleSerializer(CountryFieldMixin, I18nAwareModelSerializer):
         fields = ('id', 'name', 'rate', 'price_includes_tax', 'eu_reverse_charge', 'home_country')
 
 
-class EventSettingsSerializer(serializers.Serializer):
+class EventSettingsSerializer(SettingsSerializer):
     default_fields = [
         'imprint_url',
         'checkout_email_helptext',
         'presale_has_ended_text',
         'voucher_explanation_text',
+        'checkout_success_text',
         'banner_text',
         'banner_text_bottom',
         'show_dates_on_frontpage',
@@ -576,6 +609,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'locale',
         'region',
         'last_order_modification_date',
+        'allow_modifications_after_checkin',
         'show_quota_left',
         'waiting_list_enabled',
         'waiting_list_hours',
@@ -623,6 +657,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'mail_from',
         'mail_from_name',
         'mail_attach_ical',
+        'mail_attach_tickets',
         'invoice_address_asked',
         'invoice_address_required',
         'invoice_address_vatid',
@@ -654,6 +689,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'invoice_additional_text',
         'invoice_footer_text',
         'invoice_eu_currencies',
+        'invoice_logo_image',
         'cancel_allow_user',
         'cancel_allow_user_until',
         'cancel_allow_user_paid',
@@ -663,6 +699,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'cancel_allow_user_paid_keep_percentage',
         'cancel_allow_user_paid_adjust_fees',
         'cancel_allow_user_paid_adjust_fees_explanation',
+        'cancel_allow_user_paid_adjust_fees_step',
         'cancel_allow_user_paid_refund_as_giftcard',
         'cancel_allow_user_paid_require_approval',
         'change_allow_user_variation',
@@ -674,45 +711,21 @@ class EventSettingsSerializer(serializers.Serializer):
         'theme_color_background',
         'theme_round_borders',
         'primary_font',
+        'logo_image',
+        'logo_image_large',
+        'logo_show_title',
+        'og_image',
     ]
 
     def __init__(self, *args, **kwargs):
         self.event = kwargs.pop('event')
-        self.changed_data = []
         super().__init__(*args, **kwargs)
-        for fname in self.default_fields:
-            kwargs = DEFAULTS[fname].get('serializer_kwargs', {})
-            if callable(kwargs):
-                kwargs = kwargs()
-            kwargs.setdefault('required', False)
-            kwargs.setdefault('allow_null', True)
-            form_kwargs = DEFAULTS[fname].get('form_kwargs', {})
-            if callable(form_kwargs):
-                form_kwargs = form_kwargs()
-            if 'serializer_class' not in DEFAULTS[fname]:
-                raise ValidationError('{} has no serializer class'.format(fname))
-            f = DEFAULTS[fname]['serializer_class'](
-                **kwargs
-            )
-            f._label = form_kwargs.get('label', fname)
-            f._help_text = form_kwargs.get('help_text')
-            self.fields[fname] = f
 
         for recv, resp in api_event_settings_fields.send(sender=self.event):
             for fname, field in resp.items():
                 field.required = False
                 self.fields[fname] = field
 
-    def update(self, instance: HierarkeyProxy, validated_data):
-        for attr, value in validated_data.items():
-            if value is None:
-                instance.delete(attr)
-                self.changed_data.append(attr)
-            elif instance.get(attr, as_type=type(value)) != value:
-                instance.set(attr, value)
-                self.changed_data.append(attr)
-        return instance
-
     def validate(self, data):
         data = super().validate(data)
         settings_dict = self.instance.freeze()
@@ -720,6 +733,14 @@ class EventSettingsSerializer(serializers.Serializer):
         validate_event_settings(self.event, settings_dict)
         return data
 
+    def get_new_filename(self, name: str) -> str:
+        nonce = get_random_string(length=8)
+        fname = '%s/%s/%s.%s.%s' % (
+            self.event.organizer.slug, self.event.slug, name.split('/')[-1], nonce, name.split('.')[-1]
+        )
+        # TODO: make sure pub is always correct
+        return 'pub/' + fname
+
 
 class DeviceEventSettingsSerializer(EventSettingsSerializer):
     default_fields = [

src/pretix/api/serializers/fields.py

@@ -1,5 +1,6 @@
 from collections import OrderedDict
 
+from django.core.exceptions import ValidationError
 from rest_framework import serializers
 
 
@@ -27,3 +28,50 @@ class ListMultipleChoiceField(serializers.MultipleChoiceField):
         ]
 
         return remove_duplicates_from_list(representation_data)
+
+
+class UploadedFileField(serializers.Field):
+    default_error_messages = {
+        'required': 'No file was submitted.',
+        'not_found': 'The submitted file ID was not found.',
+        'invalid_type': 'The submitted file has a file type that is not allowed in this field.',
+        'size': 'The submitted file is too large to be used in this field.',
+    }
+
+    def __init__(self, *args, **kwargs):
+        self.allowed_types = kwargs.pop('allowed_types', None)
+        self.max_size = kwargs.pop('max_size', None)
+        super().__init__(*args, **kwargs)
+
+    def to_internal_value(self, data):
+        from pretix.base.models import CachedFile
+
+        request = self.context.get('request', None)
+        try:
+            cf = CachedFile.objects.get(
+                session_key=f'api-upload-{str(type(request.user or request.auth))}-{(request.user or request.auth).pk}',
+                file__isnull=False,
+                pk=data[len("file:"):],
+            )
+        except (ValidationError, IndexError):  # invalid uuid
+            self.fail('not_found')
+        except CachedFile.DoesNotExist:
+            self.fail('not_found')
+
+        if self.allowed_types and cf.type not in self.allowed_types:
+            self.fail('invalid_type')
+        if self.max_size and cf.file.size > self.max_size:
+            self.fail('size')
+
+        return cf.file
+
+    def to_representation(self, value):
+        if not value:
+            return None
+
+        try:
+            url = value.url
+        except AttributeError:
+            return None
+        request = self.context['request']
+        return request.build_absolute_uri(url)

src/pretix/api/serializers/item.py

@@ -7,6 +7,7 @@ from django.utils.translation import gettext_lazy as _
 from rest_framework import serializers
 
 from pretix.api.serializers.event import MetaDataField
+from pretix.api.serializers.fields import UploadedFileField
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.base.models import (
     Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaValue, ItemVariation,
@@ -113,6 +114,9 @@ class ItemSerializer(I18nAwareModelSerializer):
     variations = InlineItemVariationSerializer(many=True, required=False)
     tax_rate = ItemTaxRateField(source='*', read_only=True)
     meta_data = MetaDataField(required=False, source='*')
+    picture = UploadedFileField(required=False, allow_null=True, allowed_types=(
+        'image/png', 'image/jpeg', 'image/gif'
+    ), max_size=10 * 1024 * 1024)
 
     class Meta:
         model = Item
@@ -123,7 +127,7 @@ class ItemSerializer(I18nAwareModelSerializer):
                   'min_per_order', 'max_per_order', 'checkin_attention', 'has_variations', 'variations',
                   'addons', 'bundles', 'original_price', 'require_approval', 'generate_tickets',
                   'show_quota_left', 'hidden_if_available', 'allow_waitinglist', 'issue_giftcard', 'meta_data')
-        read_only_fields = ('has_variations', 'picture')
+        read_only_fields = ('has_variations',)
 
     def validate(self, data):
         data = super().validate(data)

src/pretix/api/serializers/order.py

@@ -3,6 +3,7 @@ from collections import Counter, defaultdict
 from decimal import Decimal
 
 import pycountry
+from django.core.files import File
 from django.db.models import F, Q
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy
@@ -17,13 +18,14 @@ from pretix.base.channels import get_all_sales_channels
 from pretix.base.decimal import round_decimal
 from pretix.base.i18n import language
 from pretix.base.models import (
-    Checkin, Invoice, InvoiceAddress, InvoiceLine, Item, ItemVariation, Order,
-    OrderPosition, Question, QuestionAnswer, Seat, SubEvent, TaxRule, Voucher,
+    CachedFile, Checkin, Invoice, InvoiceAddress, InvoiceLine, Item,
+    ItemVariation, Order, OrderPosition, Question, QuestionAnswer, Seat,
+    SubEvent, TaxRule, Voucher,
 )
 from pretix.base.models.orders import (
     CartPosition, OrderFee, OrderPayment, OrderRefund, RevokedTicketSecret,
 )
-from pretix.base.pdf import get_variables
+from pretix.base.pdf import get_images, get_variables
 from pretix.base.services.cart import error_messages
 from pretix.base.services.locking import NoLockManager
 from pretix.base.services.pricing import get_price
@@ -94,12 +96,9 @@ class AnswerQuestionIdentifierField(serializers.Field):
 
 class AnswerQuestionOptionsIdentifierField(serializers.Field):
     def to_representation(self, instance: QuestionAnswer):
-        return [o.identifier for o in instance.options.all()]
-
-
-class AnswerQuestionOptionsField(serializers.Field):
-    def to_representation(self, instance: QuestionAnswer):
-        return [o.pk for o in instance.options.all()]
+        if isinstance(instance, WrappedModel) or instance.pk:
+            return [o.identifier for o in instance.options.all()]
+        return []
 
 
 class InlineSeatSerializer(I18nAwareModelSerializer):
@@ -112,12 +111,102 @@ class InlineSeatSerializer(I18nAwareModelSerializer):
 class AnswerSerializer(I18nAwareModelSerializer):
     question_identifier = AnswerQuestionIdentifierField(source='*', read_only=True)
     option_identifiers = AnswerQuestionOptionsIdentifierField(source='*', read_only=True)
-    options = AnswerQuestionOptionsField(source='*', read_only=True)
+
+    def to_representation(self, instance):
+        r = super().to_representation(instance)
+        if r['answer'].startswith('file://') and instance.orderposition:
+            r['answer'] = reverse('api-v1:orderposition-answer', kwargs={
+                'organizer': instance.orderposition.order.event.organizer.slug,
+                'event': instance.orderposition.order.event.slug,
+                'pk': instance.orderposition.pk,
+                'question': instance.question_id,
+            }, request=self.context['request'])
+        return r
 
     class Meta:
         model = QuestionAnswer
         fields = ('question', 'answer', 'question_identifier', 'options', 'option_identifiers')
 
+    def validate_question(self, q):
+        if q.event != self.context['event']:
+            raise ValidationError(
+                'The specified question does not belong to this event.'
+            )
+        return q
+
+    def _handle_file_upload(self, data):
+        try:
+            ao = self.context["request"].user or self.context["request"].auth
+            cf = CachedFile.objects.get(
+                session_key=f'api-upload-{str(type(ao))}-{ao.pk}',
+                file__isnull=False,
+                pk=data['answer'][len("file:"):],
+            )
+        except (ValidationError, IndexError):  # invalid uuid
+            raise ValidationError('The submitted file ID "{fid}" was not found.'.format(fid=data))
+        except CachedFile.DoesNotExist:
+            raise ValidationError('The submitted file ID "{fid}" was not found.'.format(fid=data))
+
+        allowed_types = (
+            'image/png', 'image/jpeg', 'image/gif', 'application/pdf'
+        )
+        if cf.type not in allowed_types:
+            raise ValidationError('The submitted file "{fid}" has a file type that is not allowed in this field.'.format(fid=data))
+        if cf.file.size > 10 * 1024 * 1024:
+            raise ValidationError('The submitted file "{fid}" is too large to be used in this field.'.format(fid=data))
+
+        data['options'] = []
+        data['answer'] = cf.file
+        return data
+
+    def validate(self, data):
+        if data.get('question').type == Question.TYPE_FILE:
+            return self._handle_file_upload(data)
+        elif data.get('question').type in (Question.TYPE_CHOICE, Question.TYPE_CHOICE_MULTIPLE):
+            if not data.get('options'):
+                raise ValidationError(
+                    'You need to specify options if the question is of a choice type.'
+                )
+            if data.get('question').type == Question.TYPE_CHOICE and len(data.get('options')) > 1:
+                raise ValidationError(
+                    'You can specify at most one option for this question.'
+                )
+            for o in data.get('options'):
+                if o.question_id != data.get('question').pk:
+                    raise ValidationError(
+                        'The specified option does not belong to this question.'
+                    )
+
+            data['answer'] = ", ".join([str(o) for o in data.get('options')])
+
+        else:
+            if data.get('options'):
+                raise ValidationError(
+                    'You should not specify options if the question is not of a choice type.'
+                )
+
+            if data.get('question').type == Question.TYPE_BOOLEAN:
+                if data.get('answer') in ['true', 'True', '1', 'TRUE']:
+                    data['answer'] = 'True'
+                elif data.get('answer') in ['false', 'False', '0', 'FALSE']:
+                    data['answer'] = 'False'
+                else:
+                    raise ValidationError(
+                        'Please specify "true" or "false" for boolean questions.'
+                    )
+            elif data.get('question').type == Question.TYPE_NUMBER:
+                serializers.DecimalField(
+                    max_digits=50,
+                    decimal_places=25
+                ).to_internal_value(data.get('answer'))
+            elif data.get('question').type == Question.TYPE_DATE:
+                data['answer'] = serializers.DateField().to_internal_value(data.get('answer'))
+            elif data.get('question').type == Question.TYPE_TIME:
+                data['answer'] = serializers.TimeField().to_internal_value(data.get('answer'))
+            elif data.get('question').type == Question.TYPE_DATETIME:
+                data['answer'] = serializers.DateTimeField().to_internal_value(data.get('answer'))
+        return data
+
 
 class CheckinSerializer(I18nAwareModelSerializer):
     class Meta:
@@ -187,6 +276,9 @@ class PdfDataSerializer(serializers.Field):
             if 'vars' not in self.context:
                 self.context['vars'] = get_variables(self.context['request'].event)
 
+            if 'vars_images' not in self.context:
+                self.context['vars_images'] = get_images(self.context['request'].event)
+
             for k, f in self.context['vars'].items():
                 res[k] = f['evaluate'](instance, instance.order, ev)
 
@@ -201,17 +293,39 @@ class PdfDataSerializer(serializers.Field):
             for k, v in instance.item._cached_meta_data.items():
                 res['itemmeta:' + k] = v
 
-        return res
+            res['images'] = {}
+
+            for k, f in self.context['vars_images'].items():
+                if 'etag' in f:
+                    has_image = etag = f['etag'](instance, instance.order, ev)
+                else:
+                    has_image = f['etag'](instance, instance.order, ev)
+                    etag = None
+                if has_image:
+                    url = reverse('api-v1:orderposition-pdf_image', kwargs={
+                        'organizer': instance.order.event.organizer.slug,
+                        'event': instance.order.event.slug,
+                        'pk': instance.pk,
+                        'key': k,
+                    }, request=self.context['request'])
+                    if etag:
+                        url += f'#etag={etag}'
+                    res['images'][k] = url
+                else:
+                    res['images'][k] = None
+
+            return res
 
 
 class OrderPositionSerializer(I18nAwareModelSerializer):
-    checkins = CheckinSerializer(many=True)
+    checkins = CheckinSerializer(many=True, read_only=True)
     answers = AnswerSerializer(many=True)
-    downloads = PositionDownloadsField(source='*')
+    downloads = PositionDownloadsField(source='*', read_only=True)
     order = serializers.SlugRelatedField(slug_field='code', read_only=True)
-    pdf_data = PdfDataSerializer(source='*')
+    pdf_data = PdfDataSerializer(source='*', read_only=True)
     seat = InlineSeatSerializer(read_only=True)
     country = CompatibleCountryField(source='*')
+    attendee_name = serializers.CharField(required=False)
 
     class Meta:
         model = OrderPosition
@@ -219,12 +333,99 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
                   'company', 'street', 'zipcode', 'city', 'country', 'state',
                   'attendee_email', 'voucher', 'tax_rate', 'tax_value', 'secret', 'addon_to', 'subevent', 'checkins',
                   'downloads', 'answers', 'tax_rule', 'pseudonymization_id', 'pdf_data', 'seat', 'canceled')
+        read_only_fields = (
+            'id', 'order', 'positionid', 'item', 'variation', 'price', 'voucher', 'tax_rate', 'tax_value', 'secret',
+            'addon_to', 'subevent', 'checkins', 'downloads', 'answers', 'tax_rule', 'pseudonymization_id', 'pdf_data',
+            'seat', 'canceled'
+        )
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         if 'request' in self.context and not self.context['request'].query_params.get('pdf_data', 'false') == 'true':
             self.fields.pop('pdf_data')
 
+    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):
+        # 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
+                    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(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):
     def to_representation(self, instance: OrderPosition):
@@ -336,7 +537,7 @@ class OrderRefundSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = OrderRefund
-        fields = ('local_id', 'state', 'source', 'amount', 'payment', 'created', 'execution_date', 'provider')
+        fields = ('local_id', 'state', 'source', 'amount', 'payment', 'created', 'execution_date', 'comment', 'provider')
 
 
 class OrderURLField(serializers.URLField):
@@ -425,7 +626,17 @@ class OrderSerializer(I18nAwareModelSerializer):
         return instance
 
 
+class AnswerQuestionOptionsField(serializers.Field):
+    def to_representation(self, instance: QuestionAnswer):
+        return [o.pk for o in instance.options.all()]
+
+
+class SimulatedAnswerSerializer(AnswerSerializer):
+    options = AnswerQuestionOptionsField(read_only=True, source='*')
+
+
 class SimulatedOrderPositionSerializer(OrderPositionSerializer):
+    answers = SimulatedAnswerSerializer(many=True)
     addon_to = serializers.SlugRelatedField(read_only=True, slug_field='positionid')
 
 
@@ -452,62 +663,8 @@ class PriceCalcSerializer(serializers.Serializer):
             del self.fields['subevent']
 
 
-class AnswerCreateSerializer(I18nAwareModelSerializer):
-
-    class Meta:
-        model = QuestionAnswer
-        fields = ('question', 'answer', 'options')
-
-    def validate_question(self, q):
-        if q.event != self.context['event']:
-            raise ValidationError(
-                'The specified question does not belong to this event.'
-            )
-        return q
-
-    def validate(self, data):
-        if data.get('question').type == Question.TYPE_FILE:
-            raise ValidationError(
-                'File uploads are currently not supported via the API.'
-            )
-        elif data.get('question').type in (Question.TYPE_CHOICE, Question.TYPE_CHOICE_MULTIPLE):
-            if not data.get('options'):
-                raise ValidationError(
-                    'You need to specify options if the question is of a choice type.'
-                )
-            if data.get('question').type == Question.TYPE_CHOICE and len(data.get('options')) > 1:
-                raise ValidationError(
-                    'You can specify at most one option for this question.'
-                )
-            data['answer'] = ", ".join([str(o) for o in data.get('options')])
-
-        else:
-            if data.get('options'):
-                raise ValidationError(
-                    'You should not specify options if the question is not of a choice type.'
-                )
-
-            if data.get('question').type == Question.TYPE_BOOLEAN:
-                if data.get('answer') in ['true', 'True', '1', 'TRUE']:
-                    data['answer'] = 'True'
-                elif data.get('answer') in ['false', 'False', '0', 'FALSE']:
-                    data['answer'] = 'False'
-                else:
-                    raise ValidationError(
-                        'Please specify "true" or "false" for boolean questions.'
-                    )
-            elif data.get('question').type == Question.TYPE_NUMBER:
-                serializers.DecimalField(
-                    max_digits=50,
-                    decimal_places=25
-                ).to_internal_value(data.get('answer'))
-            elif data.get('question').type == Question.TYPE_DATE:
-                data['answer'] = serializers.DateField().to_internal_value(data.get('answer'))
-            elif data.get('question').type == Question.TYPE_TIME:
-                data['answer'] = serializers.TimeField().to_internal_value(data.get('answer'))
-            elif data.get('question').type == Question.TYPE_DATETIME:
-                data['answer'] = serializers.DateTimeField().to_internal_value(data.get('answer'))
-        return data
+class AnswerCreateSerializer(AnswerSerializer):
+    pass
 
 
 class OrderFeeCreateSerializer(I18nAwareModelSerializer):
@@ -1044,8 +1201,16 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                     pos.save()
                     for answ_data in answers_data:
                         options = answ_data.pop('options', [])
-                        answ = pos.answers.create(**answ_data)
-                        answ.options.add(*options)
+
+                        if isinstance(answ_data['answer'], File):
+                            an = answ_data.pop('answer')
+                            answ = pos.answers.create(**answ_data, answer='')
+                            answ.file.save(an.name, an, save=False)
+                            answ.answer = 'file://' + answ.file.name
+                            answ.save()
+                        else:
+                            answ = pos.answers.create(**answ_data)
+                            answ.options.add(*options)
                 pos_map[pos.positionid] = pos
 
             if not simulate:
@@ -1194,7 +1359,7 @@ class OrderRefundCreateSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = OrderRefund
-        fields = ('state', 'source', 'amount', 'payment', 'execution_date', 'provider', 'info')
+        fields = ('state', 'source', 'amount', 'payment', 'execution_date', 'provider', 'info', 'comment')
 
     def create(self, validated_data):
         pid = validated_data.pop('payment', None)

src/pretix/api/serializers/organizer.py

@@ -1,13 +1,15 @@
+import logging
 from decimal import Decimal
 
 from django.db.models import Q
+from django.utils.crypto import get_random_string
 from django.utils.translation import gettext_lazy as _
-from hierarkey.proxy import HierarkeyProxy
 from rest_framework import serializers
 from rest_framework.exceptions import ValidationError
 
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.order import CompatibleJSONField
+from pretix.api.serializers.settings import SettingsSerializer
 from pretix.base.auth import get_auth_backends
 from pretix.base.i18n import get_language_without_region
 from pretix.base.models import (
@@ -16,9 +18,11 @@ from pretix.base.models import (
 )
 from pretix.base.models.seating import SeatingPlanLayoutValidator
 from pretix.base.services.mail import SendMailException, mail
-from pretix.base.settings import DEFAULTS, validate_organizer_settings
+from pretix.base.settings import validate_organizer_settings
 from pretix.helpers.urls import build_absolute_uri
 
+logger = logging.getLogger(__name__)
+
 
 class OrganizerSerializer(I18nAwareModelSerializer):
     class Meta:
@@ -207,8 +211,10 @@ class TeamMemberSerializer(serializers.ModelSerializer):
         )
 
 
-class OrganizerSettingsSerializer(serializers.Serializer):
+class OrganizerSettingsSerializer(SettingsSerializer):
     default_fields = [
+        'contact_mail',
+        'imprint_url',
         'organizer_info_text',
         'event_list_type',
         'event_list_availability',
@@ -225,40 +231,13 @@ class OrganizerSettingsSerializer(serializers.Serializer):
         'theme_color_danger',
         'theme_color_background',
         'theme_round_borders',
-        'primary_font'
+        'primary_font',
+        'organizer_logo_image'
     ]
 
     def __init__(self, *args, **kwargs):
         self.organizer = kwargs.pop('organizer')
-        self.changed_data = []
         super().__init__(*args, **kwargs)
-        for fname in self.default_fields:
-            kwargs = DEFAULTS[fname].get('serializer_kwargs', {})
-            if callable(kwargs):
-                kwargs = kwargs()
-            kwargs.setdefault('required', False)
-            kwargs.setdefault('allow_null', True)
-            form_kwargs = DEFAULTS[fname].get('form_kwargs', {})
-            if callable(form_kwargs):
-                form_kwargs = form_kwargs()
-            if 'serializer_class' not in DEFAULTS[fname]:
-                raise ValidationError('{} has no serializer class'.format(fname))
-            f = DEFAULTS[fname]['serializer_class'](
-                **kwargs
-            )
-            f._label = form_kwargs.get('label', fname)
-            f._help_text = form_kwargs.get('help_text')
-            self.fields[fname] = f
-
-    def update(self, instance: HierarkeyProxy, validated_data):
-        for attr, value in validated_data.items():
-            if value is None:
-                instance.delete(attr)
-                self.changed_data.append(attr)
-            elif instance.get(attr, as_type=type(value)) != value:
-                instance.set(attr, value)
-                self.changed_data.append(attr)
-        return instance
 
     def validate(self, data):
         data = super().validate(data)
@@ -266,3 +245,11 @@ class OrganizerSettingsSerializer(serializers.Serializer):
         settings_dict.update(data)
         validate_organizer_settings(self.organizer, settings_dict)
         return data
+
+    def get_new_filename(self, name: str) -> str:
+        nonce = get_random_string(length=8)
+        fname = '%s/%s.%s.%s' % (
+            self.organizer.slug, name.split('/')[-1], nonce, name.split('.')[-1]
+        )
+        # TODO: make sure pub is always correct
+        return 'pub/' + fname

src/pretix/api/serializers/settings.py

@@ -0,0 +1,77 @@
+import logging
+
+from django.core.files import File
+from django.core.files.storage import default_storage
+from django.db.models.fields.files import FieldFile
+from hierarkey.proxy import HierarkeyProxy
+from rest_framework import serializers
+from rest_framework.exceptions import ValidationError
+
+from pretix.api.serializers.fields import UploadedFileField
+from pretix.base.settings import DEFAULTS
+
+logger = logging.getLogger(__name__)
+
+
+class SettingsSerializer(serializers.Serializer):
+    default_fields = []
+
+    def __init__(self, *args, **kwargs):
+        self.changed_data = []
+        super().__init__(*args, **kwargs)
+        for fname in self.default_fields:
+            kwargs = DEFAULTS[fname].get('serializer_kwargs', {})
+            if callable(kwargs):
+                kwargs = kwargs()
+            kwargs.setdefault('required', False)
+            kwargs.setdefault('allow_null', True)
+            form_kwargs = DEFAULTS[fname].get('form_kwargs', {})
+            if callable(form_kwargs):
+                form_kwargs = form_kwargs()
+            if 'serializer_class' not in DEFAULTS[fname]:
+                raise ValidationError('{} has no serializer class'.format(fname))
+            f = DEFAULTS[fname]['serializer_class'](
+                **kwargs
+            )
+            f._label = form_kwargs.get('label', fname)
+            f._help_text = form_kwargs.get('help_text')
+            f.parent = self
+            self.fields[fname] = f
+
+    def update(self, instance: HierarkeyProxy, validated_data):
+        for attr, value in validated_data.items():
+            if isinstance(value, FieldFile):
+                # Delete old file
+                fname = instance.get(attr, as_type=File)
+                if fname:
+                    try:
+                        default_storage.delete(fname.name)
+                    except OSError:  # pragma: no cover
+                        logger.error('Deleting file %s failed.' % fname.name)
+
+                # Create new file
+                newname = default_storage.save(self.get_new_filename(value.name), value)
+                instance.set(attr, File(file=value, name=newname))
+                self.changed_data.append(attr)
+            elif isinstance(self.fields[attr], UploadedFileField):
+                if value is None:
+                    fname = instance.get(attr, as_type=File)
+                    if fname:
+                        try:
+                            default_storage.delete(fname.name)
+                        except OSError:  # pragma: no cover
+                            logger.error('Deleting file %s failed.' % fname.name)
+                    instance.delete(attr)
+                else:
+                    # file is unchanged
+                    continue
+            elif value is None:
+                instance.delete(attr)
+                self.changed_data.append(attr)
+            elif instance.get(attr, as_type=type(value)) != value:
+                instance.set(attr, value)
+                self.changed_data.append(attr)
+        return instance
+
+    def get_new_filename(self, name: str) -> str:
+        raise NotImplementedError()

src/pretix/api/urls.py

@@ -7,8 +7,8 @@ from rest_framework import routers
 from pretix.api.views import cart
 
 from .views import (
-    checkin, device, event, exporters, item, oauth, order, organizer, user,
-    version, voucher, waitinglist, webhooks,
+    checkin, device, event, exporters, item, oauth, order, organizer, upload,
+    user, version, voucher, waitinglist, webhooks,
 )
 
 router = routers.DefaultRouter()
@@ -95,6 +95,7 @@ urlpatterns = [
     url(r"^device/roll$", device.RollKeyView.as_view(), name="device.roll"),
     url(r"^device/revoke$", device.RevokeKeyView.as_view(), name="device.revoke"),
     url(r"^device/eventselection$", device.EventSelectionView.as_view(), name="device.eventselection"),
+    url(r"^upload$", upload.UploadView.as_view(), name="upload"),
     url(r"^me$", user.MeView.as_view(), name="user.me"),
     url(r"^version$", version.VersionView.as_view(), name="version"),
 ]

src/pretix/api/views/checkin.py

@@ -22,7 +22,7 @@ from pretix.api.views import RichOrderingFilter
 from pretix.api.views.order import OrderPositionFilter
 from pretix.base.i18n import language
 from pretix.base.models import (
-    Checkin, CheckinList, Event, Order, OrderPosition,
+    CachedFile, Checkin, CheckinList, Event, Order, OrderPosition, Question,
 )
 from pretix.base.services.checkin import (
     CheckInError, RequiredQuestionsError, perform_checkin,
@@ -302,7 +302,10 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
             for q in op.item.questions.filter(ask_during_checkin=True):
                 if str(q.pk) in aws:
                     try:
-                        given_answers[q] = q.clean_answer(aws[str(q.pk)])
+                        if q.type == Question.TYPE_FILE:
+                            given_answers[q] = self._handle_file_upload(aws[str(q.pk)])
+                        else:
+                            given_answers[q] = q.clean_answer(aws[str(q.pk)])
                     except ValidationError:
                         pass
 
@@ -352,3 +355,25 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                 'require_attention': op.item.checkin_attention or op.order.checkin_attention,
                 'position': CheckinListOrderPositionSerializer(op, context=self.get_serializer_context()).data
             }, status=201)
+
+    def _handle_file_upload(self, data):
+        try:
+            cf = CachedFile.objects.get(
+                session_key=f'api-upload-{str(type(self.request.user or self.request.auth))}-{(self.request.user or self.request.auth).pk}',
+                file__isnull=False,
+                pk=data[len("file:"):],
+            )
+        except (ValidationError, IndexError):  # invalid uuid
+            raise ValidationError('The submitted file ID "{fid}" was not found.'.format(fid=data))
+        except CachedFile.DoesNotExist:
+            raise ValidationError('The submitted file ID "{fid}" was not found.'.format(fid=data))
+
+        allowed_types = (
+            'image/png', 'image/jpeg', 'image/gif', 'application/pdf'
+        )
+        if cf.type not in allowed_types:
+            raise ValidationError('The submitted file "{fid}" has a file type that is not allowed in this field.'.format(fid=data))
+        if cf.file.size > 10 * 1024 * 1024:
+            raise ValidationError('The submitted file "{fid}" is too large to be used in this field.'.format(fid=data))
+
+        return cf.file

src/pretix/api/views/event.py

@@ -365,9 +365,13 @@ class EventSettingsView(views.APIView):
 
     def get(self, request, *args, **kwargs):
         if isinstance(request.auth, Device):
-            s = DeviceEventSettingsSerializer(instance=request.event.settings, event=request.event)
+            s = DeviceEventSettingsSerializer(instance=request.event.settings, event=request.event, context={
+                'request': request
+            })
         elif 'can_change_event_settings' in request.eventpermset:
-            s = EventSettingsSerializer(instance=request.event.settings, event=request.event)
+            s = EventSettingsSerializer(instance=request.event.settings, event=request.event, context={
+                'request': request
+            })
         else:
             raise PermissionDenied()
         if 'explain' in request.GET:
@@ -382,7 +386,7 @@ class EventSettingsView(views.APIView):
 
     def patch(self, request, *wargs, **kwargs):
         s = EventSettingsSerializer(instance=request.event.settings, data=request.data, partial=True,
-                                    event=request.event)
+                                    event=request.event, context={'request': request})
         s.is_valid(raise_exception=True)
         with transaction.atomic():
             s.save()
@@ -392,6 +396,9 @@ class EventSettingsView(views.APIView):
                 }
             )
         if any(p in s.changed_data for p in SETTINGS_AFFECTING_CSS):
-            regenerate_css.apply_async(args=(request.organizer.pk,))
-        s = EventSettingsSerializer(instance=request.event.settings, event=request.event)
+            regenerate_css.apply_async(args=(request.event.pk,))
+        s = EventSettingsSerializer(
+            instance=request.event.settings, event=request.event, context={
+                'request': request
+            })
         return Response(s.data)

src/pretix/api/views/order.py

@@ -1,4 +1,6 @@
 import datetime
+import mimetypes
+import os
 from decimal import Decimal
 
 import django_filters
@@ -12,6 +14,7 @@ from django.utils.timezone import make_aware, now
 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.decorators import action
 from rest_framework.exceptions import (
@@ -35,8 +38,9 @@ from pretix.base.models import (
     Order, OrderFee, OrderPayment, OrderPosition, OrderRefund, Quota, SubEvent,
     TaxRule, TeamAPIToken, generate_secret,
 )
-from pretix.base.models.orders import RevokedTicketSecret
+from pretix.base.models.orders import QuestionAnswer, RevokedTicketSecret
 from pretix.base.payment import PaymentException
+from pretix.base.pdf import get_images
 from pretix.base.secrets import assign_ticket_secret
 from pretix.base.services import tickets
 from pretix.base.services.invoices import (
@@ -763,7 +767,7 @@ with scopes_disabled():
             }
 
 
-class OrderPositionViewSet(mixins.DestroyModelMixin, viewsets.ReadOnlyModelViewSet):
+class OrderPositionViewSet(mixins.DestroyModelMixin, mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSet):
     serializer_class = OrderPositionSerializer
     queryset = OrderPosition.all.none()
     filter_backends = (DjangoFilterBackend, OrderingFilter)
@@ -783,6 +787,11 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, viewsets.ReadOnlyModelViewS
         },
     }
 
+    def get_serializer_context(self):
+        ctx = super().get_serializer_context()
+        ctx['event'] = self.request.event
+        return ctx
+
     def get_queryset(self):
         if self.request.query_params.get('include_canceled_positions', 'false') == 'true':
             qs = OrderPosition.all
@@ -908,6 +917,62 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, viewsets.ReadOnlyModelViewS
                 'tax_rule': tr.pk if tr else None,
             })
 
+    @action(detail=True, url_name='answer', url_path=r'answer/(?P<question>\d+)')
+    def answer(self, request, **kwargs):
+        pos = self.get_object()
+        answer = get_object_or_404(
+            QuestionAnswer,
+            orderposition=self.get_object(),
+            question_id=kwargs.get('question')
+        )
+        if not answer.file:
+            raise NotFound()
+
+        ftype, ignored = mimetypes.guess_type(answer.file.name)
+        resp = FileResponse(answer.file, content_type=ftype or 'application/binary')
+        resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}"'.format(
+            self.request.event.slug.upper(),
+            pos.order.code,
+            pos.positionid,
+            os.path.basename(answer.file.name).split('.', 1)[1]
+        )
+        return resp
+
+    @action(detail=True, url_name='pdf_image', url_path=r'pdf_image/(?P<key>[^/]+)')
+    def pdf_image(self, request, key, **kwargs):
+        pos = self.get_object()
+
+        image_vars = get_images(request.event)
+        if key not in image_vars:
+            raise NotFound('Unknown key')
+
+        image_file = image_vars[key]['evaluate'](pos, pos.order, pos.subevent or self.request.event)
+        if image_file is None:
+            raise NotFound('No image available')
+
+        if getattr(image_file, 'name', ''):
+            ftype, ignored = mimetypes.guess_type(image_file.name)
+            extension = os.path.basename(image_file.name).split('.')[-1]
+        else:
+            img = Image.open(image_file)
+            ftype = Image.MIME[img.format]
+            extensions = {
+                'GIF': 'gif', 'TIFF': 'tif', 'BMP': 'bmp', 'JPEG': 'jpg', 'PNG': 'png'
+            }
+            extension = extensions.get(img.format, 'bin')
+            if hasattr(image_file, 'seek'):
+                image_file.seek(0)
+
+        resp = FileResponse(image_file, content_type=ftype or 'application/binary')
+        resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}.{}"'.format(
+            self.request.event.slug.upper(),
+            pos.order.code,
+            pos.positionid,
+            key,
+            extension,
+        )
+        return resp
+
     @action(detail=True, url_name='download', url_path='download/(?P<output>[^/]+)')
     def download(self, request, output, **kwargs):
         provider = self._get_output_provider(output)
@@ -951,6 +1016,44 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, viewsets.ReadOnlyModelViewS
         except Quota.QuotaExceededException as e:
             raise ValidationError(str(e))
 
+    def update(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.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)
+
 
 class PaymentViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
     serializer_class = OrderPaymentSerializer

src/pretix/api/views/organizer.py

@@ -425,7 +425,9 @@ class OrganizerSettingsView(views.APIView):
     permission = 'can_change_organizer_settings'
 
     def get(self, request, *args, **kwargs):
-        s = OrganizerSettingsSerializer(instance=request.organizer.settings, organizer=request.organizer)
+        s = OrganizerSettingsSerializer(instance=request.organizer.settings, organizer=request.organizer, context={
+            'request': request
+        })
         if 'explain' in request.GET:
             return Response({
                 fname: {
@@ -439,7 +441,9 @@ class OrganizerSettingsView(views.APIView):
     def patch(self, request, *wargs, **kwargs):
         s = OrganizerSettingsSerializer(
             instance=request.organizer.settings, data=request.data, partial=True,
-            organizer=request.organizer
+            organizer=request.organizer, context={
+                'request': request
+            }
         )
         s.is_valid(raise_exception=True)
         with transaction.atomic():
@@ -451,5 +455,7 @@ class OrganizerSettingsView(views.APIView):
             )
         if any(p in s.changed_data for p in SETTINGS_AFFECTING_CSS):
             regenerate_organizer_css.apply_async(args=(request.organizer.pk,))
-        s = OrganizerSettingsSerializer(instance=request.organizer.settings, organizer=request.organizer)
+        s = OrganizerSettingsSerializer(instance=request.organizer.settings, organizer=request.organizer, context={
+            'request': request
+        })
         return Response(s.data)

src/pretix/api/views/upload.py

@@ -0,0 +1,55 @@
+import datetime
+
+from django.utils.timezone import now
+from oauth2_provider.contrib.rest_framework import OAuth2Authentication
+from rest_framework.authentication import SessionAuthentication
+from rest_framework.exceptions import ValidationError
+from rest_framework.parsers import FileUploadParser
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from pretix.api.auth.device import DeviceTokenAuthentication
+from pretix.api.auth.permission import AnyAuthenticatedClientPermission
+from pretix.api.auth.token import TeamTokenAuthentication
+from pretix.base.models import CachedFile
+
+ALLOWED_TYPES = {
+    'image/gif': {'.gif'},
+    'image/jpeg': {'.jpg', '.jpeg'},
+    'image/png': {'.png'},
+    'application/pdf': {'.pdf'},
+}
+
+
+class UploadView(APIView):
+    authentication_classes = (
+        SessionAuthentication, OAuth2Authentication, DeviceTokenAuthentication, TeamTokenAuthentication
+    )
+    parser_classes = [FileUploadParser]
+    permission_classes = [AnyAuthenticatedClientPermission]
+
+    def post(self, request):
+        if 'file' not in request.data:
+            raise ValidationError('No file has been submitted.')
+        file_obj = request.data['file']
+        content_type = file_obj.content_type.split(";")[0]  # ignore e.g. "; charset=…"
+        if content_type not in ALLOWED_TYPES:
+            raise ValidationError('Content type "{type}" is not allowed'.format(type=content_type))
+        if not any(file_obj.name.endswith(ext) for ext in ALLOWED_TYPES[content_type]):
+            raise ValidationError('File name "{name}" has an invalid extension for type "{type}"'.format(
+                name=file_obj.name,
+                type=content_type
+            ))
+        cf = CachedFile.objects.create(
+            expires=now() + datetime.timedelta(days=1),
+            date=now(),
+            web_download=False,
+            filename=file_obj.name,
+            type=content_type,
+            session_key=f'api-upload-{str(type(request.user or request.auth))}-{(request.user or request.auth).pk}'
+        )
+        cf.file.save(file_obj.name, file_obj)
+        cf.save()
+        return Response({
+            'id': f'file:{cf.pk}'
+        }, status=201)

src/pretix/api/views/version.py

@@ -6,6 +6,7 @@ from rest_framework.views import APIView
 
 from pretix import __version__
 from pretix.api.auth.device import DeviceTokenAuthentication
+from pretix.api.auth.permission import AnyAuthenticatedClientPermission
 from pretix.api.auth.token import TeamTokenAuthentication
 
 
@@ -48,6 +49,7 @@ class VersionView(APIView):
     authentication_classes = (
         SessionAuthentication, OAuth2Authentication, DeviceTokenAuthentication, TeamTokenAuthentication
     )
+    permission_classes = [AnyAuthenticatedClientPermission]
 
     def get(self, request, format=None):
         return Response({

src/pretix/base/email.py

@@ -427,28 +427,30 @@ def base_placeholders(sender, **kwargs):
             'orders', ['event', 'orders'], lambda event, orders: '\n' + '\n\n'.join(
                 '* {} - {}'.format(
                     order.full_code,
-                    build_absolute_uri(event, 'presale:event.order', kwargs={
+                    build_absolute_uri(event, 'presale:event.order.open', kwargs={
                         'event': event.slug,
                         'organizer': event.organizer.slug,
                         'order': order.code,
-                        'secret': order.secret
+                        'secret': order.secret,
+                        'hash': order.email_confirm_hash(),
                     }),
                 )
                 for order in orders
             ), lambda event: '\n' + '\n\n'.join(
                 '* {} - {}'.format(
                     '{}-{}'.format(event.slug.upper(), order['code']),
-                    build_absolute_uri(event, 'presale:event.order', kwargs={
+                    build_absolute_uri(event, 'presale:event.order.open', kwargs={
                         'event': event.slug,
                         'organizer': event.organizer.slug,
                         'order': order['code'],
-                        'secret': order['secret']
+                        'secret': order['secret'],
+                        'hash': order['hash'],
                     }),
                 )
                 for order in [
-                    {'code': 'F8VVL', 'secret': '6zzjnumtsx136ddy'},
-                    {'code': 'HIDHK', 'secret': '98kusd8ofsj8dnkd'},
-                    {'code': 'OPKSB', 'secret': '09pjdksflosk3njd'}
+                    {'code': 'F8VVL', 'secret': '6zzjnumtsx136ddy', 'hash': 'abcdefghi'},
+                    {'code': 'HIDHK', 'secret': '98kusd8ofsj8dnkd', 'hash': 'jklmnopqr'},
+                    {'code': 'OPKSB', 'secret': '09pjdksflosk3njd', 'hash': 'stuvwxy2z'}
                 ]
             ),
         ),
@@ -466,7 +468,8 @@ def base_placeholders(sender, **kwargs):
             '68CYU2H6ZTP3WLK5'
         ),
         SimpleFunctionalMailTextPlaceholder(
-            'voucher_list', ['voucher_list'], lambda voucher_list: '\n'.join(voucher_list),
+            # join vouchers with two spaces at end of line so markdown-parser inserts a <br>
+            'voucher_list', ['voucher_list'], lambda voucher_list: '  \n'.join(voucher_list),
             '    68CYU2H6ZTP3WLK5\n    7MB94KKPVEPSMVF2'
         ),
         SimpleFunctionalMailTextPlaceholder(

src/pretix/base/exporter.py

@@ -1,4 +1,5 @@
 import io
+import re
 import tempfile
 from collections import OrderedDict, namedtuple
 from decimal import Decimal
@@ -10,11 +11,21 @@ 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 KNOWN_TYPES
+from openpyxl.cell.cell import ILLEGAL_CHARACTERS_RE, KNOWN_TYPES
 
 from pretix.base.models import Event
 
 
+def excel_safe(val):
+    if not isinstance(val, KNOWN_TYPES):
+        val = str(val)
+
+    if isinstance(val, str):
+        val = re.sub(ILLEGAL_CHARACTERS_RE, '', val)
+
+    return val
+
+
 class BaseExporter:
     """
     This is the base class for all data exporters
@@ -181,7 +192,7 @@ class ListExporter(BaseExporter):
                 total = line.total
                 continue
             ws.append([
-                str(val) if not isinstance(val, KNOWN_TYPES) else val
+                excel_safe(val) if not isinstance(val, KNOWN_TYPES) else val
                 for val in line
             ])
             if total:
@@ -242,7 +253,10 @@ class MultiSheetListExporter(ListExporter):
         pass
 
     def iterate_sheet(self, form_data, sheet):
-        raise NotImplementedError()  # noqa
+        if hasattr(self, 'iterate_' + sheet):
+            yield from getattr(self, 'iterate_' + sheet)(form_data)
+        else:
+            raise NotImplementedError()  # noqa
 
     def _render_sheet_csv(self, form_data, sheet, output_file=None, **kwargs):
         total = 0
@@ -288,6 +302,9 @@ class MultiSheetListExporter(ListExporter):
         n_sheets = len(self.sheets)
         for i_sheet, (s, l) in enumerate(self.sheets):
             ws = wb.create_sheet(str(l))
+            if hasattr(self, 'prepare_xlsx_sheet_' + s):
+                getattr(self, 'prepare_xlsx_sheet_' + s)(ws)
+
             total = 0
             counter = 0
             for i, line in enumerate(self.iterate_sheet(form_data, sheet=s)):
@@ -295,7 +312,7 @@ class MultiSheetListExporter(ListExporter):
                     total = line.total
                     continue
                 ws.append([
-                    str(val) if not isinstance(val, KNOWN_TYPES) else val
+                    excel_safe(val)
                     for val in line
                 ])
                 if total:

src/pretix/base/exporters/invoices.py

@@ -13,6 +13,7 @@ from django.utils.functional import cached_property
 from django.utils.translation import gettext, gettext_lazy as _, pgettext
 
 from pretix.base.models import Invoice, InvoiceLine, OrderPayment
+from ..services.export import ExportError
 
 from ...control.forms.filter import get_all_payment_providers
 from ...helpers import GroupConcat
@@ -66,7 +67,7 @@ class InvoiceExporterMixin:
         )
 
     def invoices_queryset(self, form_data: dict):
-        qs = Invoice.objects.filter(event__in=self.events)
+        qs = Invoice.objects.filter(event__in=self.events).select_related('order')
 
         if form_data.get('payment_provider'):
             qs = qs.annotate(
@@ -111,14 +112,16 @@ class InvoiceExporter(InvoiceExporterMixin, BaseExporter):
                         if not i.file:
                             invoice_pdf_task.apply(args=(i.pk,))
                             i.refresh_from_db()
+                        if not i.file:
+                            raise ExportError('Could not generate PDF for invoice {nr}'.format(nr=i.full_invoice_no))
                         i.file.open('rb')
-                        zipf.writestr('{}.pdf'.format(i.number), i.file.read())
+                        zipf.writestr('{}-{}.pdf'.format(i.number, i.order.code), i.file.read())
                         i.file.close()
                     except FileNotFoundError:
                         invoice_pdf_task.apply(args=(i.pk,))
                         i.refresh_from_db()
                         i.file.open('rb')
-                        zipf.writestr('{}.pdf'.format(i.number), i.file.read())
+                        zipf.writestr('{}-{}.pdf'.format(i.number, i.order.code), i.file.read())
                         i.file.close()
                     counter += 1
                     if total and counter % max(10, total // 100) == 0:

src/pretix/base/exporters/orderlist.py

@@ -59,6 +59,12 @@ class OrderListExporter(MultiSheetListExporter):
                      initial=False,
                      required=False
                  )),
+                ('group_multiple_choice',
+                 forms.BooleanField(
+                     label=_('Show multiple choice answers grouped in one column'),
+                     initial=False,
+                     required=False
+                 )),
             ]
         )
 
@@ -449,9 +455,14 @@ class OrderListExporter(MultiSheetListExporter):
         for q in questions:
             if q.type == Question.TYPE_CHOICE_MULTIPLE:
                 options[q.pk] = []
-                for o in q.options.all():
-                    headers.append(str(q.question) + ' – ' + str(o.answer))
-                    options[q.pk].append(o)
+                if form_data['group_multiple_choice']:
+                    for o in q.options.all():
+                        options[q.pk].append(o)
+                    headers.append(str(q.question))
+                else:
+                    for o in q.options.all():
+                        headers.append(str(q.question) + ' – ' + str(o.answer))
+                        options[q.pk].append(o)
             else:
                 headers.append(str(q.question))
         headers += [
@@ -551,8 +562,11 @@ class OrderListExporter(MultiSheetListExporter):
                         acache[a.question_id] = str(a)
                 for q in questions:
                     if q.type == Question.TYPE_CHOICE_MULTIPLE:
-                        for o in options[q.pk]:
-                            row.append(_('Yes') if o.pk in acache.get(q.pk, set()) else _('No'))
+                        if form_data['group_multiple_choice']:
+                            row.append(", ".join(str(o.answer) for o in options[q.pk] if o.pk in acache.get(q.pk, set())))
+                        else:
+                            for o in options[q.pk]:
+                                row.append(_('Yes') if o.pk in acache.get(q.pk, set()) else _('No'))
                     else:
                         row.append(acache.get(q.pk, ''))
 
@@ -638,7 +652,7 @@ class PaymentListExporter(ListExporter):
 
         headers = [
             _('Event slug'), _('Order'), _('Payment ID'), _('Creation date'), _('Completion date'), _('Status'),
-            _('Status code'), _('Amount'), _('Payment method')
+            _('Status code'), _('Amount'), _('Payment method'), _('Comment')
         ]
         yield headers
 
@@ -660,7 +674,8 @@ class PaymentListExporter(ListExporter):
                 obj.get_state_display(),
                 obj.state,
                 obj.amount * (-1 if isinstance(obj, OrderRefund) else 1),
-                provider_names.get(obj.provider, obj.provider)
+                provider_names.get(obj.provider, obj.provider),
+                obj.comment if isinstance(obj, OrderRefund) else "",
             ]
             yield row
 

src/pretix/base/forms/questions.py

@@ -9,20 +9,19 @@ import pycountry
 import pytz
 import vat_moss.errors
 import vat_moss.id
-from babel import localedata
+from babel import Locale
 from django import forms
 from django.contrib import messages
 from django.core.exceptions import ValidationError
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db.models import QuerySet
 from django.forms import Select
+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
 from django.utils.timezone import get_current_timezone
-from django.utils.translation import (
-    get_language, gettext_lazy as _, pgettext_lazy,
-)
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_countries import countries
 from django_countries.fields import Country, CountryField
 from phonenumber_field.formfields import PhoneNumberField
@@ -35,7 +34,9 @@ from pretix.base.forms.widgets import (
     BusinessBooleanRadio, DatePickerWidget, SplitDateTimePickerWidget,
     TimePickerWidget, UploadedFileWidget,
 )
-from pretix.base.i18n import get_language_without_region, language
+from pretix.base.i18n import (
+    get_babel_locale, get_language_without_region, language,
+)
 from pretix.base.models import InvoiceAddress, Question, QuestionOption
 from pretix.base.models.tax import (
     EU_COUNTRIES, cc_to_vat_prefix, is_eu_country,
@@ -204,7 +205,47 @@ class NamePartsFormField(forms.MultiValueField):
         return value
 
 
+class WrappedPhonePrefixSelect(Select):
+    initial = None
+
+    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))
+        for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
+            prefix = "+%d" % prefix
+            if initial and initial in values:
+                self.initial = prefix
+            for country_code in values:
+                country_name = locale.territories.get(country_code)
+                if country_name:
+                    choices.append((prefix, "{} {}".format(country_name, prefix)))
+        super().__init__(choices=sorted(choices, key=lambda item: item[1]))
+
+    def render(self, name, value, *args, **kwargs):
+        return super().render(name, value or self.initial, *args, **kwargs)
+
+    def get_context(self, name, value, attrs):
+        if value and self.choices[1][0] != value:
+            matching_choices = len([1 for p, c in self.choices if p == value])
+            if matching_choices > 1:
+                # Some countries share a phone prefix, for example +1 is used all over the Americas.
+                # This causes a UX problem: If the default value or the existing data is +12125552368,
+                # the widget will just show the first <option> entry with value="+1" as selected,
+                # which alphabetically is America Samoa, although most numbers statistically are from
+                # the US. As a workaround, we detect this case and add an aditional choice value with
+                # just <option value="+1">+1</option> without an explicit country.
+                self.choices.insert(1, (value, value))
+        context = super().get_context(name, value, attrs)
+        return context
+
+
 class WrappedPhoneNumberPrefixWidget(PhoneNumberPrefixWidget):
+
+    def __init__(self, attrs=None, initial=None):
+        widgets = (WrappedPhonePrefixSelect(initial), forms.TextInput())
+        super(PhoneNumberPrefixWidget, self).__init__(widgets, attrs)
+
     def render(self, name, value, attrs=None, renderer=None):
         output = super().render(name, value, attrs, renderer)
         return mark_safe(self.format_output(output))
@@ -403,6 +444,7 @@ class BaseQuestionsForm(forms.Form):
             c = [('', pgettext_lazy('address', 'Select state'))]
             fprefix = str(self.prefix) + '-' if self.prefix is not None and self.prefix != '-' else ''
             cc = None
+            state = None
             if fprefix + 'country' in self.data:
                 cc = str(self.data[fprefix + 'country'])
             elif country:
@@ -411,6 +453,7 @@ class BaseQuestionsForm(forms.Form):
                 types, form = COUNTRIES_WITH_STATE_IN_ADDRESS[cc]
                 statelist = [s for s in pycountry.subdivisions.get(country_code=cc) if s.type in types]
                 c += sorted([(s.code[3:], s.name) for s in statelist], key=lambda s: s[1])
+                state = (cartpos.state if cartpos else orderpos.state)
             elif fprefix + 'state' in self.data:
                 self.data = self.data.copy()
                 del self.data[fprefix + 'state']
@@ -419,6 +462,7 @@ class BaseQuestionsForm(forms.Form):
                 label=pgettext_lazy('address', 'State'),
                 required=False,
                 choices=c,
+                initial=state,
                 widget=forms.Select(attrs={
                     'autocomplete': 'address-level1',
                 }),
@@ -564,13 +608,7 @@ class BaseQuestionsForm(forms.Form):
                 if q.valid_datetime_max:
                     field.validators.append(MaxDateTimeValidator(q.valid_datetime_max))
             elif q.type == Question.TYPE_PHONENUMBER:
-                babel_locale = 'en'
-                # Babel, and therefore django-phonenumberfield, do not support our custom locales such das de_Informal
-                if localedata.exists(get_language()):
-                    babel_locale = get_language()
-                elif localedata.exists(get_language()[:2]):
-                    babel_locale = get_language()[:2]
-                with language(babel_locale):
+                with language(get_babel_locale()):
                     default_country = guess_country(event)
                     default_prefix = None
                     for prefix, values in _COUNTRY_CODE_TO_REGION_CODE.items():
@@ -655,8 +693,9 @@ class BaseQuestionsForm(forms.Form):
         if not self.all_optional:
             for q in question_cache.values():
                 answer = d.get('question_%d' % q.pk)
-                if question_is_required(q) and not answer and answer != 0:
-                    raise ValidationError({'question_%d' % q.pk: [_('This field is required')]})
+                field = self['question_%d' % q.pk]
+                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.')]})
 
         return d
 
@@ -812,11 +851,13 @@ class BaseInvoiceAddressForm(forms.ModelForm):
         ) and len(data.get('name_parts', {})) == 1:
             # Do not save the country if it is the only field set -- we don't know the user even checked it!
             self.cleaned_data['country'] = ''
+
+        if data.get('vat_id') and is_eu_country(data.get('country')) and data.get('vat_id')[:2] != cc_to_vat_prefix(str(data.get('country'))):
+            raise ValidationError(_('Your VAT ID does not match the selected country.'))
+
         if self.validate_vat_id and self.instance.vat_id_validated and 'vat_id' not in self.changed_data:
             pass
         elif self.validate_vat_id and data.get('is_business') and is_eu_country(data.get('country')) and data.get('vat_id'):
-            if data.get('vat_id')[:2] != cc_to_vat_prefix(str(data.get('country'))):
-                raise ValidationError(_('Your VAT ID does not match the selected country.'))
             try:
                 result = vat_moss.id.validate(data.get('vat_id'))
                 if result:

src/pretix/base/forms/widgets.py

@@ -16,12 +16,15 @@ class DatePickerWidget(forms.DateInput):
         date_attrs = dict(attrs)
         date_attrs.setdefault('class', 'form-control')
         date_attrs['class'] += ' datepickerfield'
-        date_attrs['autocomplete'] = 'date-picker-do-not-autofill'
+        date_attrs['autocomplete'] = 'off'
 
-        df = date_format or get_format('DATE_INPUT_FORMATS')[0]
-        date_attrs['placeholder'] = now().replace(
-            year=2000, month=12, day=31, hour=18, minute=0, second=0, microsecond=0
-        ).strftime(df)
+        def placeholder():
+            df = date_format or get_format('DATE_INPUT_FORMATS')[0]
+            return now().replace(
+                year=2000, month=12, day=31, hour=18, minute=0, second=0, microsecond=0
+            ).strftime(df)
+
+        date_attrs['placeholder'] = lazy(placeholder, str)
 
         forms.DateInput.__init__(self, date_attrs, date_format)
 
@@ -34,12 +37,15 @@ class TimePickerWidget(forms.TimeInput):
         time_attrs = dict(attrs)
         time_attrs.setdefault('class', 'form-control')
         time_attrs['class'] += ' timepickerfield'
-        time_attrs['autocomplete'] = 'time-picker-do-not-autofill'
+        time_attrs['autocomplete'] = 'off'
 
-        tf = time_format or get_format('TIME_INPUT_FORMATS')[0]
-        time_attrs['placeholder'] = now().replace(
-            year=2000, month=12, day=31, hour=18, minute=0, second=0, microsecond=0
-        ).strftime(tf)
+        def placeholder():
+            tf = time_format or get_format('TIME_INPUT_FORMATS')[0]
+            return now().replace(
+                year=2000, month=1, day=1, hour=0, minute=0, second=0, microsecond=0
+            ).strftime(tf)
+
+        time_attrs['placeholder'] = lazy(placeholder, str)
 
         forms.TimeInput.__init__(self, time_attrs, time_format)
 
@@ -105,8 +111,8 @@ class SplitDateTimePickerWidget(forms.SplitDateTimeWidget):
         time_attrs.setdefault('autocomplete', 'off')
         date_attrs['class'] += ' datepickerfield'
         time_attrs['class'] += ' timepickerfield'
-        date_attrs['autocomplete'] = 'date-picker-do-not-autofill'
-        time_attrs['autocomplete'] = 'time-picker-do-not-autofill'
+        date_attrs['autocomplete'] = 'off'
+        time_attrs['autocomplete'] = 'off'
         if min_date:
             date_attrs['data-min'] = (
                 min_date if isinstance(min_date, date) else min_date.astimezone(get_current_timezone()).date()

src/pretix/base/i18n.py

@@ -1,5 +1,6 @@
 from contextlib import contextmanager
 
+from babel import localedata
 from django.conf import settings
 from django.utils import translation
 from django.utils.formats import date_format, number_format
@@ -69,6 +70,16 @@ class LazyNumber:
 ALLOWED_LANGUAGES = dict(settings.LANGUAGES)
 
 
+def get_babel_locale():
+    babel_locale = 'en'
+    # Babel, and therefore django-phonenumberfield, do not support our custom locales such das de_Informal
+    if localedata.exists(translation.get_language()):
+        babel_locale = translation.get_language()
+    elif localedata.exists(translation.get_language()[:2]):
+        babel_locale = translation.get_language()[:2]
+    return babel_locale
+
+
 def get_language_without_region(lng=None):
     """
     Returns the currently active language, but strips what pretix calls a ``region``. For example,

src/pretix/base/invoice.py

@@ -12,12 +12,10 @@ from django.utils.formats import date_format, localize
 from django.utils.translation import (
     get_language, gettext, gettext_lazy, pgettext,
 )
-from PIL.Image import BICUBIC
 from reportlab.lib import pagesizes
 from reportlab.lib.enums import TA_LEFT, TA_RIGHT
 from reportlab.lib.styles import ParagraphStyle, StyleSheet1
 from reportlab.lib.units import mm
-from reportlab.lib.utils import ImageReader
 from reportlab.pdfbase import pdfmetrics
 from reportlab.pdfbase.pdfmetrics import stringWidth
 from reportlab.pdfbase.ttfonts import TTFont
@@ -31,6 +29,7 @@ from pretix.base.decimal import round_decimal
 from pretix.base.models import Event, Invoice, Order
 from pretix.base.signals import register_invoice_renderers
 from pretix.base.templatetags.money import money_filter
+from pretix.helpers.reportlab import ThumbnailingImageReader
 
 logger = logging.getLogger(__name__)
 
@@ -221,26 +220,6 @@ class BaseReportlabInvoiceRenderer(BaseInvoiceRenderer):
         return 'invoice.pdf', 'application/pdf', buffer.read()
 
 
-class ThumbnailingImageReader(ImageReader):
-    def resize(self, width, height, dpi):
-        if width is None:
-            width = height * self._image.size[0] / self._image.size[1]
-        if height is None:
-            height = width * self._image.size[1] / self._image.size[0]
-        self._image.thumbnail(
-            size=(int(width * dpi / 72), int(height * dpi / 72)),
-            resample=BICUBIC
-        )
-        self._data = None
-        return width, height
-
-    def _jpeg_fh(self):
-        # Bypass a reportlab-internal optimization that falls back to the original
-        # file handle if the file is a JPEG, and therefore does not respect the
-        # (smaller) size of the modified image.
-        return None
-
-
 class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
     identifier = 'classic'
     verbose_name = pgettext('invoice', 'Classic renderer (pretix 1.0)')
@@ -276,8 +255,10 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
     invoice_from_top = 17 * mm
 
     def _draw_invoice_from(self, canvas):
-        p = Paragraph(self.invoice.full_invoice_from.strip().replace('\n', '<br />\n'), style=self.stylesheet[
-            'InvoiceFrom'])
+        p = Paragraph(
+            bleach.clean(self.invoice.full_invoice_from, tags=[]).strip().replace('\n', '<br />\n'),
+            style=self.stylesheet['InvoiceFrom']
+        )
         p.wrapOn(canvas, self.invoice_from_width, self.invoice_from_height)
         p_size = p.wrap(self.invoice_from_width, self.invoice_from_height)
         p.drawOn(canvas, self.invoice_from_left, self.pagesize[1] - p_size[1] - self.invoice_from_top)
@@ -382,6 +363,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
     def _draw_event(self, canvas):
         def shorten(txt):
             txt = str(txt)
+            txt = bleach.clean(txt, tags=[]).strip()
             p = Paragraph(txt.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
             p_size = p.wrap(self.event_width, self.event_height)
 
@@ -462,13 +444,18 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         story = []
         if self.invoice.custom_field:
             story.append(Paragraph(
-                '{}: {}'.format(self.invoice.event.settings.invoice_address_custom_field, self.invoice.custom_field),
+                '{}: {}'.format(
+                    bleach.clean(self.invoice.event.settings.invoice_address_custom_field, tags=[]).strip().replace('\n', '<br />\n'),
+                    bleach.clean(self.invoice.custom_field, tags=[]).strip().replace('\n', '<br />\n'),
+                ),
                 self.stylesheet['Normal']
             ))
 
         if self.invoice.internal_reference:
             story.append(Paragraph(
-                pgettext('invoice', 'Customer reference: {reference}').format(reference=self.invoice.internal_reference),
+                pgettext('invoice', 'Customer reference: {reference}').format(
+                    reference=bleach.clean(self.invoice.internal_reference, tags=[]).strip().replace('\n', '<br />\n'),
+                ),
                 self.stylesheet['Normal']
             ))
 
@@ -487,7 +474,10 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
             ))
 
         if self.invoice.introductory_text:
-            story.append(Paragraph(self.invoice.introductory_text, self.stylesheet['Normal']))
+            story.append(Paragraph(
+                bleach.clean(self.invoice.introductory_text, tags=[]).strip().replace('\n', '<br />\n'),
+                self.stylesheet['Normal']
+            ))
             story.append(Spacer(1, 10 * mm))
 
         return story
@@ -587,10 +577,16 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         story.append(Spacer(1, 15 * mm))
 
         if self.invoice.payment_provider_text:
-            story.append(Paragraph(self.invoice.payment_provider_text, self.stylesheet['Normal']))
+            story.append(Paragraph(
+                bleach.clean(self.invoice.payment_provider_text, tags=[]).strip().replace('\n', '<br />\n'),
+                self.stylesheet['Normal']
+            ))
 
         if self.invoice.additional_text:
-            story.append(Paragraph(self.invoice.additional_text, self.stylesheet['Normal']))
+            story.append(Paragraph(
+                bleach.clean(self.invoice.additional_text, tags=[]).strip().replace('\n', '<br />\n'),
+                self.stylesheet['Normal']
+            ))
             story.append(Spacer(1, 15 * mm))
 
         tstyledata = [
@@ -722,7 +718,10 @@ class Modern1Renderer(ClassicInvoiceRenderer):
     def _draw_invoice_from(self, canvas):
         if not self.invoice.invoice_from:
             return
-        c = self.invoice.address_invoice_from.strip().split('\n')
+        c = [
+            bleach.clean(l, tags=[]).strip().replace('\n', '<br />\n')
+            for l in self.invoice.address_invoice_from.strip().split('\n')
+        ]
         p = Paragraph(' · '.join(c), style=self.stylesheet['Sender'])
         p.wrapOn(canvas, self.invoice_to_width, 15.7 * mm)
         p.drawOn(canvas, self.invoice_to_left, self.pagesize[1] - self.invoice_to_top + 2 * mm)

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

@@ -30,7 +30,7 @@ class Command(BaseCommand):
                     continue
 
             if verbosity > 1:
-                self.stdout.write(f'Running {name}…')
+                self.stdout.write(f'INFO Running {name}…')
             t0 = time.time()
             try:
                 r = receiver(signal=periodic_task, sender=self)
@@ -40,13 +40,13 @@ class Command(BaseCommand):
                 if settings.SENTRY_ENABLED:
                     from sentry_sdk import capture_exception
                     capture_exception(err)
-                    self.stdout.write(self.style.ERROR(f'FAIL: {str(err)}\n'))
+                    self.stdout.write(self.style.ERROR(f'ERROR runperiodic {str(err)}\n'))
                 else:
-                    self.stdout.write(self.style.ERROR(f'FAIL: {str(err)}\n'))
+                    self.stdout.write(self.style.ERROR(f'ERROR runperiodic {str(err)}\n'))
                     traceback.print_exc()
             else:
                 if options.get('verbosity') > 1:
                     if r is SKIPPED:
-                        self.stdout.write(self.style.SUCCESS(f'Skipped {name}'))
+                        self.stdout.write(self.style.SUCCESS(f'INFO Skipped {name}'))
                     else:
-                        self.stdout.write(self.style.SUCCESS(f'Completed {name} in {round(time.time() - t0, 3)}s'))
+                        self.stdout.write(self.style.SUCCESS(f'INFO Completed {name} in {round(time.time() - t0, 3)}s'))

src/pretix/base/metrics.py

@@ -1,4 +1,6 @@
+import json
 import math
+import time
 from collections import defaultdict
 
 from django.apps import apps
@@ -6,6 +8,7 @@ from django.conf import settings
 from django.db import connection
 
 from pretix.base.models import Event, Invoice, Order, OrderPosition, Organizer
+from pretix.celery_app import app
 
 if settings.HAS_REDIS:
     import django_redis
@@ -248,6 +251,19 @@ def metric_values():
         else:
             metrics['pretix_model_instances']['{model="%s"}' % m._meta] = estimate_count_fast(m)
 
+    if settings.HAS_CELERY:
+        client = app.broker_connection().channel().client
+        for q in settings.CELERY_TASK_QUEUES:
+            llen = client.llen(q.name)
+            lfirst = client.lindex(q.name, -1)
+            metrics['pretix_celery_tasks_queued_count']['{queue="%s"}' % q.name] = llen
+            if lfirst:
+                ldata = json.loads(lfirst)
+                dt = time.time() - ldata.get('created', 0)
+                metrics['pretix_celery_tasks_queued_age_seconds']['{queue="%s"}' % q.name] = dt
+            else:
+                metrics['pretix_celery_tasks_queued_age_seconds']['{queue="%s"}' % q.name] = 0
+
     return metrics
 
 

src/pretix/base/migrations/0175_orderrefund_comment.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.11 on 2021-01-15 09:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0174_merge_20201222_1031'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='orderrefund',
+            name='comment',
+            field=models.TextField(null=True),
+        ),
+    ]

src/pretix/base/migrations/0176_auto_20210205_1512.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.0.11 on 2021-02-05 15:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0175_orderrefund_comment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='allowed_values',
+            field=models.TextField(null=True),
+        ),
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='protected',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='required',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/models/event.py

@@ -10,15 +10,18 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.files.storage import default_storage
 from django.core.mail import get_connection
-from django.core.validators import RegexValidator
+from django.core.validators import (
+    MaxValueValidator, MinLengthValidator, MinValueValidator, RegexValidator,
+)
 from django.db import models
 from django.db.models import Exists, OuterRef, Prefetch, Q, Subquery, Value
 from django.template.defaultfilters import date as _date
+from django.urls import reverse
 from django.utils.crypto import get_random_string
 from django.utils.formats import date_format
 from django.utils.functional import cached_property
 from django.utils.timezone import make_aware, now
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext, gettext_lazy as _
 from django_scopes import ScopedManager, scopes_disabled
 from i18nfield.fields import I18nCharField, I18nTextField
 
@@ -353,8 +356,11 @@ class Event(EventMixin, LoggedModel):
             "remembered, but you can also choose to use a random value. "
             "This will be used in URLs, order codes, invoice numbers, and bank transfer references."),
         validators=[
+            MinLengthValidator(
+                limit_value=2,
+            ),
             RegexValidator(
-                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]*$",
+                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]*[a-zA-Z0-9]$",
                 message=_("The slug may only contain letters, numbers, dots and dashes."),
             ),
             EventSlugBanlistValidator()
@@ -393,10 +399,18 @@ class Event(EventMixin, LoggedModel):
     geo_lat = models.FloatField(
         verbose_name=_("Latitude"),
         null=True, blank=True,
+        validators=[
+            MinValueValidator(-90),
+            MaxValueValidator(90),
+        ]
     )
     geo_lon = models.FloatField(
         verbose_name=_("Longitude"),
         null=True, blank=True,
+        validators=[
+            MinValueValidator(-180),
+            MaxValueValidator(180),
+        ]
     )
     plugins = models.TextField(
         null=False, blank=True,
@@ -848,7 +862,7 @@ class Event(EventMixin, LoggedModel):
         Returns the currently configured ticket secret generator.
         """
         tsgs = self.ticket_secret_generators
-        return tsgs[self.settings.ticket_secret_generator]
+        return tsgs.get(self.settings.ticket_secret_generator, tsgs.get('random'))
 
     def get_data_shredders(self) -> dict:
         """
@@ -940,6 +954,18 @@ class Event(EventMixin, LoggedModel):
         if not self.quotas.exists():
             issues.append(_('You need to configure at least one quota to sell anything.'))
 
+        for mp in self.organizer.meta_properties.all():
+            if mp.required and not self.meta_data.get(mp.name):
+                issues.append(
+                    ('<a {a_attr}>' + gettext('You need to fill the meta parameter "{property}".') + '</a>').format(
+                        property=mp.name,
+                        a_attr='href="%s#id_prop-%d-value"' % (
+                            reverse('control:event.settings', kwargs={'organizer': self.organizer.slug, 'event': self.slug}),
+                            mp.pk
+                        )
+                    )
+                )
+
         responses = event_live_issues.send(self)
         for receiver, response in sorted(responses, key=lambda r: str(r[0])):
             if response:
@@ -1121,10 +1147,18 @@ class SubEvent(EventMixin, LoggedModel):
     geo_lat = models.FloatField(
         verbose_name=_("Latitude"),
         null=True, blank=True,
+        validators=[
+            MinValueValidator(-90),
+            MaxValueValidator(90),
+        ]
     )
     geo_lon = models.FloatField(
         verbose_name=_("Longitude"),
-        null=True, blank=True
+        null=True, blank=True,
+        validators=[
+            MinValueValidator(-180),
+            MaxValueValidator(180),
+        ]
     )
     frontpage_text = I18nTextField(
         null=True, blank=True,
@@ -1342,7 +1376,26 @@ class EventMetaProperty(LoggedModel):
         ],
         verbose_name=_("Name"),
     )
-    default = models.TextField(blank=True)
+    default = models.TextField(blank=True, verbose_name=_("Default value"))
+    protected = models.BooleanField(default=False,
+                                    verbose_name=_("Can only be changed by organizer-level administrators"))
+    required = models.BooleanField(
+        default=False, verbose_name=_("Required for events"),
+        help_text=_("If checked, an event can only be taken live if the property is set. In event series, its always "
+                    "optional to set a value for individual dates")
+    )
+    allowed_values = models.TextField(
+        null=True, blank=True,
+        verbose_name=_("Valid values"),
+        help_text=_("If you keep this empty, any value is allowed. Otherwise, enter one possible value per line.")
+    )
+
+    def full_clean(self, exclude=None, validate_unique=True):
+        super().full_clean(exclude, validate_unique)
+        if self.default and self.required:
+            raise ValidationError(_("A property can either be required or have a default value, not both."))
+        if self.default and self.allowed_values and self.default not in self.allowed_values.splitlines():
+            raise ValidationError(_("You cannot set a default value that is not a valid value."))
 
 
 class EventMetaValue(LoggedModel):

src/pretix/base/models/items.py

@@ -1026,7 +1026,7 @@ class Question(LoggedModel):
         (TYPE_PHONENUMBER, _("Phone number")),
     )
     UNLOCALIZED_TYPES = [TYPE_DATE, TYPE_TIME, TYPE_DATETIME]
-    ASK_DURING_CHECKIN_UNSUPPORTED = [TYPE_FILE, TYPE_PHONENUMBER]
+    ASK_DURING_CHECKIN_UNSUPPORTED = [TYPE_PHONENUMBER]
 
     event = models.ForeignKey(
         Event,
@@ -1069,6 +1069,7 @@ class Question(LoggedModel):
     )
     ask_during_checkin = models.BooleanField(
         verbose_name=_('Ask during check-in instead of in the ticket buying process'),
+        help_text=_('Not supported by all check-in apps for all question types.'),
         default=False
     )
     hidden = models.BooleanField(

src/pretix/base/models/orders.py

@@ -2,7 +2,6 @@ import copy
 import hashlib
 import json
 import logging
-import os
 import string
 from collections import Counter
 from datetime import datetime, time, timedelta
@@ -615,21 +614,26 @@ class Order(LockModel, LoggedModel):
         return proposals
 
     @staticmethod
-    def normalize_code(code):
-        tr = str.maketrans({
+    def normalize_code(code, is_fallback=False):
+        d = {
             '2': 'Z',
             '4': 'A',
             '5': 'S',
             '6': 'G',
-        })
+        }
+        if is_fallback:
+            d['8'] = 'B'
+            # 8 has been removed from the character set only in 2021, which means there are a lot of order codes
+            # with an 8 in it around. We only want to replace this when this is used in a fallback.
+        tr = str.maketrans(d)
         return code.upper().translate(tr)
 
     def assign_code(self):
         # This omits some character pairs completely because they are hard to read even on screens (1/I and O/0)
         # and includes only one of two characters for some pairs because they are sometimes hard to distinguish in
-        # handwriting (2/Z, 4/A, 5/S, 6/G). This allows for better detection e.g. in incoming wire transfers that
+        # handwriting (2/Z, 4/A, 5/S, 6/G, 8/B). This allows for better detection e.g. in incoming wire transfers that
         # might include OCR'd handwritten text
-        charset = list('ABCDEFGHJKLMNPQRSTUVWXYZ3789')
+        charset = list('ABCDEFGHJKLMNPQRSTUVWXYZ379')
         iteration = 0
         length = settings.ENTROPY['order_code']
         while True:
@@ -661,6 +665,8 @@ class Order(LockModel, LoggedModel):
         related to the order. This checks order status and modification deadlines. It also
         returns ``False`` if there are no questions that can be answered.
         """
+        from .checkin import Checkin
+
         if self.status not in (Order.STATUS_PENDING, Order.STATUS_PAID, Order.STATUS_EXPIRED):
             return False
 
@@ -676,10 +682,21 @@ class Order(LockModel, LoggedModel):
 
         if modify_deadline is not None and now() > modify_deadline:
             return False
+
+        positions = list(
+            self.positions.all().annotate(
+                has_checkin=Exists(Checkin.objects.filter(position_id=OuterRef('pk')))
+            ).select_related('item').prefetch_related('item__questions')
+        )
+        if not self.event.settings.allow_modifications_after_checkin:
+            for cp in positions:
+                if cp.has_checkin:
+                    return False
+
         if self.event.settings.get('invoice_address_asked', as_type=bool):
             return True
         ask_names = self.event.settings.get('attendee_names_asked', as_type=bool)
-        for cp in self.positions.all().prefetch_related('item__questions'):
+        for cp in positions:
             if (cp.item.admission and ask_names) or cp.item.questions.all():
                 return True
 
@@ -1219,6 +1236,9 @@ class AbstractPosition(models.Model):
                 else self.variation.quotas.filter(subevent=self.subevent))
 
     def save(self, *args, **kwargs):
+        update_fields = kwargs.get('update_fields', [])
+        if 'attendee_name_parts' in update_fields:
+            update_fields.append('attendee_name_cached')
         self.attendee_name_cached = self.attendee_name
         if self.attendee_name_parts is None:
             self.attendee_name_parts = {}
@@ -1484,7 +1504,7 @@ class OrderPayment(models.Model):
                        OrderRefund.REFUND_STATE_CREATED)
         ).aggregate(s=Sum('amount'))['s'] or Decimal('0.00')
         if payment_sum - refund_sum < self.order.total:
-            logger.info('Confirmed payment {} but payment sum is {} and refund sum is.'.format(
+            logger.info('Confirmed payment {} but payment sum is {} and refund sum is {}.'.format(
                 self.full_id, payment_sum, refund_sum
             ))
             return
@@ -1708,6 +1728,11 @@ class OrderRefund(models.Model):
         max_length=255,
         verbose_name=_("Payment provider")
     )
+    comment = models.TextField(
+        verbose_name=_("Refund reason"),
+        help_text=_('May be shown to the end user or used e.g. as part of a payment reference.'),
+        null=True, blank=True
+    )
     info = models.TextField(
         verbose_name=_("Payment information"),
         null=True, blank=True
@@ -1746,7 +1771,7 @@ class OrderRefund(models.Model):
         Marks the refund as complete. This does not modify the state of the order.
 
         :param user: The user who performed the change
-        :param user: The API auth token that performed the change
+        :param auth: The API auth token that performed the change
         """
         self.state = self.REFUND_STATE_DONE
         self.execution_date = self.execution_date or now()
@@ -2307,7 +2332,6 @@ def cachedticket_name(instance, filename: str) -> str:
         no=instance.order_position.positionid,
         code=instance.order_position.order.code,
         secret=secret,
-        ext=os.path.splitext(filename)[1]
     )
 
 

src/pretix/base/models/organizer.py

@@ -1,9 +1,10 @@
 import string
 from datetime import date, datetime, time
 
-from django.core.validators import RegexValidator
+from django.core.validators import MinLengthValidator, RegexValidator
 from django.db import models
 from django.db.models import Exists, OuterRef, Q
+from django.urls import reverse
 from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
 from django.utils.timezone import get_current_timezone, make_aware, now
@@ -38,8 +39,11 @@ class Organizer(LoggedModel):
             "Should be short, only contain lowercase letters, numbers, dots, and dashes. Every slug can only be used "
             "once. This is being used in URLs to refer to your organizer accounts and your events."),
         validators=[
+            MinLengthValidator(
+                limit_value=2,
+            ),
             RegexValidator(
-                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]+$",
+                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]*[a-zA-Z0-9]$",
                 message=_("The slug may only contain letters, numbers, dots and dashes.")
             ),
             OrganizerSlugBanlistValidator()
@@ -85,6 +89,15 @@ class Organizer(LoggedModel):
 
         return ObjectRelatedCache(self)
 
+    @cached_property
+    def all_logentries_link(self):
+        return reverse(
+            'control:organizer.log',
+            kwargs={
+                'organizer': self.slug,
+            }
+        )
+
     @property
     def has_gift_cards(self):
         return self.cache.get_or_set(

src/pretix/base/payment.py

@@ -9,7 +9,7 @@ import pytz
 from django import forms
 from django.conf import settings
 from django.contrib import messages
-from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.db import transaction
 from django.dispatch import receiver
 from django.forms import Form
@@ -706,12 +706,24 @@ class BasePaymentProvider:
         It should return HTML code containing information regarding the current payment
         status and, if applicable, next steps.
 
-        The default implementation returns the verbose name of the payment provider.
+        The default implementation returns an empty string.
 
         :param order: The order object
         """
         return ''
 
+    def payment_control_render_short(self, payment: OrderPayment) -> str:
+        """
+        Will be called if the *event administrator* performs an action on the payment. Should
+        return a very short version of the payment method. Usually, this should return e.g.
+        a transaction ID or account identifier, but no information on status, dates, etc.
+
+        The default implementation falls back to ``payment_presale_render``.
+
+        :param order: The order object
+        """
+        return self.payment_presale_render(payment)
+
     def refund_control_render(self, request: HttpRequest, refund: OrderRefund) -> str:
         """
         Will be called if the *event administrator* views the details of a refund.
@@ -725,6 +737,19 @@ class BasePaymentProvider:
         """
         return ''
 
+    def payment_presale_render(self, payment: OrderPayment) -> str:
+        """
+        Will be called if the *ticket customer* views the details of a payment. This is
+        currently used e.g. when the customer requests a refund to show which payment
+        method is used for the refund. This should only include very basic information
+        about the payment, such as "VISA card ****9999", and never raw payment information.
+
+        The default implementation returns the public name of the payment provider.
+
+        :param order: The order object
+        """
+        return self.public_name
+
     def payment_refund_supported(self, payment: OrderPayment) -> bool:
         """
         Will be called to check if the provider supports automatic refunding for this
@@ -760,6 +785,32 @@ class BasePaymentProvider:
         """
         raise PaymentException(_('Automatic refunds are not supported by this payment provider.'))
 
+    def new_refund_control_form_render(self, request: HttpRequest, order: Order) -> str:
+        """
+        Render a form that will be shown to backend users when trying to create a new refund.
+
+        Usually, refunds are created from an existing payment object, e.g. if there is a credit card
+        payment and the credit card provider returns ``True`` from ``payment_refund_supported``, the system
+        will automatically create an ``OrderRefund`` and call ``execute_refund`` on that payment. This method
+        can and should not be used in that situation! Instead, by implementing this method you can add a refund
+        flow for this payment provider that starts without an existing payment. For example, even though an order
+        was paid by credit card, it could easily be refunded by SEPA bank transfer. In that case, the SEPA bank
+        transfer provider would implement this method and return a form that asks for the IBAN.
+
+        This method should return HTML or ``None``. All form fields should have a globally unique name.
+        """
+        return
+
+    def new_refund_control_form_process(self, request: HttpRequest, amount: Decimal, order: Order) -> OrderRefund:
+        """
+        Process a backend user's request to initiate a new refund with an amount of ``amount`` for ``order``.
+
+        This method should parse the input provided to the form created and either raise ``ValidationError``
+        or return an ``OrderRefund`` object in ``created`` state that has not yet been saved to the database.
+        The system will then call ``execute_refund`` on that object.
+        """
+        raise ValidationError('Not implemented')
+
     def shred_payment_info(self, obj: Union[OrderPayment, OrderRefund]):
         """
         When personal data is removed from an event, this method is called to scrub payment-related data
@@ -899,7 +950,7 @@ class ManualPayment(BasePaymentProvider):
 
     @property
     def public_name(self):
-        return str(self.settings.get('public_name', as_type=LazyI18nString))
+        return str(self.settings.get('public_name', as_type=LazyI18nString) or _('Manual payment'))
 
     @property
     def settings_form_fields(self):

src/pretix/base/pdf.py

@@ -1,4 +1,5 @@
 import copy
+import hashlib
 import itertools
 import logging
 import os
@@ -35,9 +36,9 @@ from reportlab.platypus import Paragraph
 
 from pretix.base.i18n import language
 from pretix.base.invoice import ThumbnailingImageReader
-from pretix.base.models import Order, OrderPosition
+from pretix.base.models import Order, OrderPosition, Question
 from pretix.base.settings import PERSON_NAME_SCHEMES
-from pretix.base.signals import layout_text_variables
+from pretix.base.signals import layout_image_variables, layout_text_variables
 from pretix.base.templatetags.money import money_filter
 from pretix.base.templatetags.phone_format import phone_format
 from pretix.presale.style import get_fonts
@@ -154,6 +155,11 @@ DEFAULT_VARIABLES = OrderedDict((
         "editor_sample": _("Sample event name"),
         "evaluate": lambda op, order, ev: str(ev.name)
     }),
+    ("event_series_name", {
+        "label": _("Event series"),
+        "editor_sample": _("Sample event name"),
+        "evaluate": lambda op, order, ev: str(order.event.name)
+    }),
     ("event_date", {
         "label": _("Event date"),
         "editor_sample": _("May 31st, 2017"),
@@ -339,6 +345,47 @@ DEFAULT_VARIABLES = OrderedDict((
         "evaluate": lambda op, order, ev: str(op.seat.seat_number if op.seat else "")
     }),
 ))
+DEFAULT_IMAGES = OrderedDict([])
+
+
+@receiver(layout_image_variables, dispatch_uid="pretix_base_layout_image_variables_questions")
+def images_from_questions(sender, *args, **kwargs):
+    def get_answer(op, order, event, question_id, etag):
+        a = None
+        if op.addon_to:
+            if 'answers' in getattr(op.addon_to, '_prefetched_objects_cache', {}):
+                try:
+                    a = [a for a in op.addon_to.answers.all() if a.question_id == question_id][0]
+                except IndexError:
+                    pass
+            else:
+                a = op.addon_to.answers.filter(question_id=question_id).first()
+
+        if 'answers' in getattr(op, '_prefetched_objects_cache', {}):
+            try:
+                a = [a for a in op.answers.all() if a.question_id == question_id][0]
+            except IndexError:
+                pass
+        else:
+            a = op.answers.filter(question_id=question_id).first()
+
+        if not a or not a.file or not any(a.file.name.lower().endswith(e) for e in (".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tif", ".tiff")):
+            return None
+        else:
+            if etag:
+                return hashlib.sha1(a.file.name.encode()).hexdigest()
+            return a.file
+
+    d = {}
+    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),
+            'evaluate': partial(get_answer, question_id=q.pk, etag=False),
+            'etag': partial(get_answer, question_id=q.pk, etag=True),
+        }
+    return d
 
 
 @receiver(layout_text_variables, dispatch_uid="pretix_base_layout_text_variables_questions")
@@ -369,6 +416,8 @@ def variables_from_questions(sender, *args, **kwargs):
 
     d = {}
     for q in sender.questions.all():
+        if q.type == Question.TYPE_FILE:
+            continue
         d['question_{}'.format(q.pk)] = {
             'label': _('Question: {question}').format(question=q.question),
             'editor_sample': _('<Answer: {question}>').format(question=q.question),
@@ -387,6 +436,15 @@ def _get_ia_name_part(key, op, order, ev):
     return order.invoice_address.name_parts.get(key, '') if getattr(order, 'invoice_address', None) else ''
 
 
+def get_images(event):
+    v = copy.copy(DEFAULT_IMAGES)
+
+    for recv, res in layout_image_variables.send(sender=event):
+        v.update(res)
+
+    return v
+
+
 def get_variables(event):
     v = copy.copy(DEFAULT_VARIABLES)
 
@@ -427,6 +485,7 @@ class Renderer:
         self.layout = layout
         self.background_file = background_file
         self.variables = get_variables(event)
+        self.images = get_images(event)
         self.event = event
         if self.background_file:
             self.bg_bytes = self.background_file.read()
@@ -514,6 +573,47 @@ class Renderer:
                 return '(error)'
         return ''
 
+    def _draw_imagearea(self, canvas: Canvas, op: OrderPosition, order: Order, o: dict):
+        ev = self._get_ev(op, order)
+        if not o['content'] or o['content'] not in self.images:
+            image_file = None
+        else:
+            try:
+                image_file = self.images[o['content']]['evaluate'](op, order, ev)
+            except:
+                logger.exception('Failed to process variable.')
+                image_file = None
+
+        if image_file:
+            ir = ThumbnailingImageReader(image_file)
+            try:
+                ir.resize(float(o['width']) * mm, float(o['height']) * mm, 300)
+            except:
+                logger.exception("Can not resize image")
+                pass
+            canvas.drawImage(
+                image=ir,
+                x=float(o['left']) * mm,
+                y=float(o['bottom']) * mm,
+                width=float(o['width']) * mm,
+                height=float(o['height']) * mm,
+                preserveAspectRatio=True,
+                anchor='c',  # centered in frame
+                mask='auto'
+            )
+        else:
+            canvas.saveState()
+            canvas.setFillColorRGB(.8, .8, .8, alpha=1)
+            canvas.rect(
+                x=float(o['left']) * mm,
+                y=float(o['bottom']) * mm,
+                width=float(o['width']) * mm,
+                height=float(o['height']) * mm,
+                stroke=0,
+                fill=1,
+            )
+            canvas.restoreState()
+
     def _draw_textarea(self, canvas: Canvas, op: OrderPosition, order: Order, o: dict):
         font = o['fontfamily']
         if o['bold']:
@@ -572,6 +672,8 @@ class Renderer:
         for o in self.layout:
             if o['type'] == "barcodearea":
                 self._draw_barcodearea(canvas, op, 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":

src/pretix/base/secrets.py

@@ -4,7 +4,7 @@ import struct
 
 from cryptography.hazmat.backends.openssl.backend import Backend
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
-from cryptography.hazmat.primitives.serialization.base import (
+from cryptography.hazmat.primitives.serialization import (
     Encoding, NoEncryption, PrivateFormat, PublicFormat, load_pem_private_key,
     load_pem_public_key,
 )

src/pretix/base/services/cancelevent.py

@@ -3,6 +3,7 @@ from decimal import Decimal
 
 from django.db import transaction
 from django.db.models import Count, Exists, IntegerField, OuterRef, Subquery
+from django.utils.translation import gettext
 from i18nfield.strings import LazyI18nString
 
 from pretix.base.decimal import round_decimal
@@ -195,7 +196,8 @@ def cancel_event(self, event: Event, subevent: int, auto_refund: bool,
                 if auto_refund:
                     _try_auto_refund(o.pk, 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)
+                                     giftcard_expires=giftcard_expires, giftcard_conditions=giftcard_conditions,
+                                     comment=gettext('Event canceled'))
             finally:
                 if send:
                     _send_mail(o, send_subject, send_message, subevent, refund_amount, user, o.positions.all())
@@ -252,7 +254,8 @@ def cancel_event(self, event: Event, subevent: int, auto_refund: bool,
             if auto_refund:
                 _try_auto_refund(o.pk, 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)
+                                 giftcard_expires=giftcard_expires, giftcard_conditions=giftcard_conditions,
+                                 comment=gettext('Event canceled'))
 
             if send:
                 _send_mail(o, send_subject, send_message, subevent, refund_amount, user, positions)

src/pretix/base/services/checkin.py

@@ -1,6 +1,7 @@
 from datetime import timedelta
 
 import dateutil
+from django.core.files import File
 from django.db import transaction
 from django.db.models.functions import TruncDate
 from django.dispatch import receiver
@@ -23,7 +24,7 @@ def get_logic_environment(ev):
         elif t == 'date_from':
             return ev.date_from
         elif t == 'date_to':
-            return ev.date_to
+            return ev.date_to or ev.date_from
         elif t == 'date_admission':
             return ev.date_admission or ev.date_from
 
@@ -101,9 +102,11 @@ class RequiredQuestionsError(Exception):
 
 
 def _save_answers(op, answers, given_answers):
+    written = False
     for q, a in given_answers.items():
         if not a:
             if q in answers:
+                written = True
                 answers[q].delete()
             else:
                 continue
@@ -112,6 +115,7 @@ def _save_answers(op, answers, given_answers):
                 qa = answers[q]
                 qa.answer = str(a.answer)
                 qa.save()
+                written = True
                 qa.options.clear()
             else:
                 qa = op.answers.create(question=q, answer=str(a.answer))
@@ -121,10 +125,20 @@ def _save_answers(op, answers, given_answers):
                 qa = answers[q]
                 qa.answer = ", ".join([str(o) for o in a])
                 qa.save()
+                written = True
                 qa.options.clear()
             else:
                 qa = op.answers.create(question=q, answer=", ".join([str(o) for o in a]))
             qa.options.add(*a)
+        elif isinstance(a, File):
+            if q in answers:
+                qa = answers[q]
+            else:
+                qa = op.answers.create(question=q, answer=str(a))
+            qa.file.save(a.name, a, save=False)
+            qa.answer = 'file://' + qa.file.name
+            qa.save()
+            written = True
         else:
             if q in answers:
                 qa = answers[q]
@@ -132,9 +146,14 @@ def _save_answers(op, answers, given_answers):
                 qa.save()
             else:
                 op.answers.create(question=q, answer=str(a))
+            written = True
+
+    if written:
+        prefetched_objects_cache = getattr(op, '_prefetched_objects_cache', {})
+        if 'answers' in prefetched_objects_cache:
+            del prefetched_objects_cache['answers']
 
 
-@transaction.atomic
 def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict, force=False,
                     ignore_unpaid=False, nonce=None, datetime=None, questions_supported=True,
                     user=None, auth=None, canceled_supported=False, type=Checkin.TYPE_ENTRY):
@@ -154,18 +173,16 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
     """
     dt = datetime or now()
 
-    # Lock order positions
-    op = OrderPosition.all.select_for_update().get(pk=op.pk)
-    checkin_questions = list(
-        clist.event.questions.filter(ask_during_checkin=True, items__in=[op.item_id])
-    )
-
     if op.canceled or op.order.status not in (Order.STATUS_PAID, Order.STATUS_PENDING):
         raise CheckInError(
             _('This order position has been canceled.'),
             'canceled' if canceled_supported else 'unpaid'
         )
 
+    # Do this outside of transaction so it is saved even if the checkin fails for some other reason
+    checkin_questions = list(
+        clist.event.questions.filter(ask_during_checkin=True, items__in=[op.item_id])
+    )
     require_answers = []
     if checkin_questions:
         answers = {a.question: a for a in op.answers.all()}
@@ -175,81 +192,85 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
 
         _save_answers(op, answers, given_answers)
 
-    if not clist.all_products and op.item_id not in [i.pk for i in clist.limit_products.all()]:
-        raise CheckInError(
-            _('This order position has an invalid product for this check-in list.'),
-            'product'
-        )
-    elif clist.subevent_id and op.subevent_id != clist.subevent_id:
-        raise CheckInError(
-            _('This order position has an invalid date for this check-in list.'),
-            'product'
-        )
-    elif op.order.status != Order.STATUS_PAID and not force and not (
-        ignore_unpaid and clist.include_pending and op.order.status == Order.STATUS_PENDING
-    ):
-        raise CheckInError(
-            _('This order is not marked as paid.'),
-            'unpaid'
-        )
-    elif require_answers and not force and questions_supported:
-        raise RequiredQuestionsError(
-            _('You need to answer questions to complete this check-in.'),
-            'incomplete',
-            require_answers
-        )
+    with transaction.atomic():
+        # Lock order positions
+        op = OrderPosition.all.select_for_update().get(pk=op.pk)
 
-    if type == Checkin.TYPE_ENTRY and clist.rules and not force:
-        rule_data = LazyRuleVars(op, clist, dt)
-        logic = get_logic_environment(op.subevent or clist.event)
-        if not logic.apply(clist.rules, rule_data):
+        if not clist.all_products and op.item_id not in [i.pk for i in clist.limit_products.all()]:
             raise CheckInError(
-                _('This entry is not permitted due to custom rules.'),
-                'rules'
+                _('This order position has an invalid product for this check-in list.'),
+                'product'
+            )
+        elif clist.subevent_id and op.subevent_id != clist.subevent_id:
+            raise CheckInError(
+                _('This order position has an invalid date for this check-in list.'),
+                'product'
+            )
+        elif op.order.status != Order.STATUS_PAID and not force and not (
+            ignore_unpaid and clist.include_pending and op.order.status == Order.STATUS_PENDING
+        ):
+            raise CheckInError(
+                _('This order is not marked as paid.'),
+                'unpaid'
+            )
+        elif require_answers and not force and questions_supported:
+            raise RequiredQuestionsError(
+                _('You need to answer questions to complete this check-in.'),
+                'incomplete',
+                require_answers
             )
 
-    device = None
-    if isinstance(auth, Device):
-        device = auth
+        if type == Checkin.TYPE_ENTRY and clist.rules and not force:
+            rule_data = LazyRuleVars(op, clist, dt)
+            logic = get_logic_environment(op.subevent or clist.event)
+            if not logic.apply(clist.rules, rule_data):
+                raise CheckInError(
+                    _('This entry is not permitted due to custom rules.'),
+                    'rules'
+                )
 
-    last_ci = op.checkins.order_by('-datetime').filter(list=clist).only('type', 'nonce').first()
-    entry_allowed = (
-        type == Checkin.TYPE_EXIT or
-        clist.allow_multiple_entries or
-        last_ci is None or
-        (clist.allow_entry_after_exit and last_ci.type == Checkin.TYPE_EXIT)
-    )
+        device = None
+        if isinstance(auth, Device):
+            device = auth
 
-    if nonce and ((last_ci and last_ci.nonce == nonce) or op.checkins.filter(type=type, list=clist, device=device, nonce=nonce).exists()):
-        return
-
-    if entry_allowed or force:
-        ci = Checkin.objects.create(
-            position=op,
-            type=type,
-            list=clist,
-            datetime=dt,
-            device=device,
-            gate=device.gate if device else None,
-            nonce=nonce,
-            forced=force and not entry_allowed,
-        )
-        op.order.log_action('pretix.event.checkin', data={
-            'position': op.id,
-            'positionid': op.positionid,
-            'first': True,
-            'forced': force or op.order.status != Order.STATUS_PAID,
-            'datetime': dt,
-            'type': type,
-            'list': clist.pk
-        }, user=user, auth=auth)
-        checkin_created.send(op.order.event, checkin=ci)
-    else:
-        raise CheckInError(
-            _('This ticket has already been redeemed.'),
-            'already_redeemed',
+        last_ci = op.checkins.order_by('-datetime').filter(list=clist).only('type', 'nonce').first()
+        entry_allowed = (
+            type == Checkin.TYPE_EXIT or
+            clist.allow_multiple_entries or
+            last_ci is None or
+            (clist.allow_entry_after_exit and last_ci.type == Checkin.TYPE_EXIT)
         )
 
+        if nonce and ((last_ci and last_ci.nonce == nonce) or op.checkins.filter(type=type, list=clist, device=device, nonce=nonce).exists()):
+            return
+
+        if entry_allowed or force:
+            ci = Checkin.objects.create(
+                position=op,
+                type=type,
+                list=clist,
+                datetime=dt,
+                device=device,
+                gate=device.gate if device else None,
+                nonce=nonce,
+                forced=force and not entry_allowed,
+            )
+            op.order.log_action('pretix.event.checkin', data={
+                'position': op.id,
+                'positionid': op.positionid,
+                'first': True,
+                'forced': force or op.order.status != Order.STATUS_PAID,
+                'datetime': dt,
+                'type': type,
+                'list': clist.pk
+            }, user=user, auth=auth)
+            checkin_created.send(op.order.event, checkin=ci)
+        else:
+            raise CheckInError(
+                _('This ticket has already been redeemed.'),
+                'already_redeemed',
+            )
+
 
 @receiver(order_placed, dispatch_uid="autocheckin_order_placed")
 def order_placed(sender, **kwargs):

src/pretix/base/services/mail.py

@@ -291,6 +291,8 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                     order = None
                 else:
                     with language(order.locale, event.settings.region):
+                        if not event.settings.mail_attach_tickets:
+                            attach_tickets = False
                         if position:
                             try:
                                 position = order.positions.get(pk=position)

src/pretix/base/services/orders.py

@@ -2034,7 +2034,7 @@ _unset = object()
 
 
 def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=OrderRefund.REFUND_SOURCE_BUYER,
-                     refund_as_giftcard=False, giftcard_expires=_unset, giftcard_conditions=None):
+                     refund_as_giftcard=False, giftcard_expires=_unset, giftcard_conditions=None, comment=None):
     notify_admin = False
     error = False
     if isinstance(order, int):
@@ -2059,6 +2059,7 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
                 order=order,
                 payment=None,
                 source=source,
+                comment=comment,
                 state=OrderRefund.REFUND_STATE_CREATED,
                 execution_date=now(),
                 amount=can_auto_refund_sum,
@@ -2096,6 +2097,7 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
                     source=source,
                     state=OrderRefund.REFUND_STATE_CREATED,
                     amount=value,
+                    comment=comment,
                     provider=p.provider
                 )
                 order.log_action('pretix.event.order.refund.created', {
@@ -2125,6 +2127,7 @@ def _try_auto_refund(order, manual_refund=False, allow_partial=False, source=Ord
             with transaction.atomic():
                 r = order.refunds.create(
                     source=source,
+                    comment=comment,
                     state=OrderRefund.REFUND_STATE_CREATED,
                     amount=refund_amount - can_auto_refund_sum,
                     provider='manual'
@@ -2149,13 +2152,14 @@ 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):
+                 device=None, cancellation_fee=None, try_auto_refund=False, refund_as_giftcard=False, comment=None):
     try:
         try:
             ret = _cancel_order(order, user, send_mail, api_token, device, oauth_application,
                                 cancellation_fee)
             if try_auto_refund:
-                _try_auto_refund(order, refund_as_giftcard=refund_as_giftcard)
+                _try_auto_refund(order, refund_as_giftcard=refund_as_giftcard,
+                                 comment=comment)
             return ret
         except LockTimeoutException:
             self.retry()

src/pretix/base/services/seating.py

@@ -36,7 +36,7 @@ def validate_plan_change(event, subevent, plan):
                               'already sold.'), leftovers[0])
 
 
-def generate_seats(event, subevent, plan, mapping):
+def generate_seats(event, subevent, plan, mapping, blocked_guids=None):
     current_seats = {}
     for s in event.seats.select_related('product').annotate(
             has_op=Count('orderposition'), has_v=Count('vouchers')
@@ -68,7 +68,10 @@ def generate_seats(event, subevent, plan, mapping):
                     update(seat, 'seat_label', ss.seat_label),
                     update(seat, 'x', ss.x),
                     update(seat, 'y', ss.y),
-                ])
+                ] + (
+                    [update(seat, 'blocked', ss.guid in blocked_guids)]
+                    if blocked_guids else []
+                ))
                 if updated:
                     seat.save()
             else:
@@ -84,6 +87,7 @@ def generate_seats(event, subevent, plan, mapping):
                     seat_label=ss.seat_label,
                     x=ss.x,
                     y=ss.y,
+                    blocked=bool(blocked_guids and ss.guid in blocked_guids),
                     product=p,
                 ))
 

src/pretix/base/services/shredder.py

@@ -75,16 +75,19 @@ def shred(event: Event, fileid: str, confirm_code: str) -> None:
         indexdata = json.loads(zipfile.read('index.json').decode())
     if indexdata['organizer'] != event.organizer.slug or indexdata['event'] != event.slug:
         raise ShredError(_("This file is from a different event."))
-    if indexdata['confirm_code'] != confirm_code:
-        raise ShredError(_("The confirm code you entered was incorrect."))
-    if event.logentry_set.filter(datetime__gte=parse(indexdata['time'])):
-        raise ShredError(_("Something happened in your event after the export, please try again."))
-
+    shredders = []
     for s in indexdata['shredders']:
         shredder = known_shredders.get(s)
         if not shredder:
             continue
+        shredders.append(shredder)
+    if any(shredder.require_download_confirmation for shredder in shredders):
+        if indexdata['confirm_code'] != confirm_code:
+            raise ShredError(_("The confirm code you entered was incorrect."))
+    if event.logentry_set.filter(datetime__gte=parse(indexdata['time'])):
+        raise ShredError(_("Something happened in your event after the export, please try again."))
 
+    for shredder in shredders:
         shredder.shred_data()
 
     cf.file.delete(save=False)

src/pretix/base/services/waitinglist.py

@@ -45,7 +45,8 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
                 continue
             if wle.subevent and not wle.subevent.presale_is_running:
                 continue
-            if not wle.item.active or (wle.variation and not wle.variation.active):
+            if not wle.item.is_available():
+                gone.add((wle.item, wle.variation, wle.subevent))
                 continue
 
             quotas = (wle.variation.quotas.filter(subevent=wle.subevent)

src/pretix/base/settings.py

@@ -13,6 +13,7 @@ from django.core.validators import (
     MaxValueValidator, MinValueValidator, RegexValidator,
 )
 from django.db.models import Model
+from django.utils.text import format_lazy
 from django.utils.translation import (
     gettext_lazy as _, gettext_noop, pgettext, pgettext_lazy,
 )
@@ -21,7 +22,9 @@ from i18nfield.forms import I18nFormField, I18nTextarea, I18nTextInput
 from i18nfield.strings import LazyI18nString
 from rest_framework import serializers
 
-from pretix.api.serializers.fields import ListMultipleChoiceField
+from pretix.api.serializers.fields import (
+    ListMultipleChoiceField, UploadedFileField,
+)
 from pretix.api.serializers.i18n import I18nField
 from pretix.base.models.tax import TaxRule
 from pretix.base.reldate import (
@@ -29,7 +32,7 @@ from pretix.base.reldate import (
     SerializerRelativeDateField, SerializerRelativeDateTimeField,
 )
 from pretix.control.forms import (
-    FontSelect, MultipleLanguagesWidget, SingleLanguageWidget,
+    ExtFileField, FontSelect, MultipleLanguagesWidget, SingleLanguageWidget,
 )
 from pretix.helpers.countries import CachedCountries
 
@@ -1080,6 +1083,15 @@ DEFAULTS = {
             help_text=_('If your event series has more than 50 dates in the future, only the month or week calendar can be used.')
         ),
     },
+    'allow_modifications_after_checkin': {
+        'default': 'False',
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Allow customers to modify their information after they checked in."),
+        )
+    },
     'last_order_modification_date': {
         'default': None,
         'type': RelativeDateWrapper,
@@ -1223,6 +1235,21 @@ DEFAULTS = {
                         "e.g. to explain choosing a lower refund will help your organization.")
         )
     },
+    'cancel_allow_user_paid_adjust_fees_step': {
+        'default': None,
+        'type': Decimal,
+        'form_class': forms.DecimalField,
+        'serializer_class': serializers.DecimalField,
+        'serializer_kwargs': dict(
+            max_digits=10, decimal_places=2
+        ),
+        'form_kwargs': dict(
+            max_digits=10, decimal_places=2,
+            label=_("Step size for reduction amount"),
+            help_text=_('By default, customers can choose an arbitrary amount for you to keep. If you set this to e.g. '
+                        '10, they will only be able to choose values in increments of 10.')
+        )
+    },
     'cancel_allow_user_paid_require_approval': {
         'default': 'False',
         'type': bool,
@@ -1296,6 +1323,19 @@ DEFAULTS = {
         'default': 'classic',
         'type': str
     },
+    'mail_attach_tickets': {
+        'default': 'True',
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Attach ticket files"),
+            help_text=format_lazy(
+                _("Tickets will never be attached if they're larger than {size} to avoid email delivery problems."),
+                size='4 MB'
+            ),
+        )
+    },
     'mail_attach_ical': {
         'default': 'False',
         'type': bool,
@@ -1784,19 +1824,66 @@ Your {event} team"""))
     },
     'logo_image': {
         'default': None,
-        'type': File
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Header image'),
+            ext_whitelist=(".png", ".jpg", ".gif", ".jpeg"),
+            max_size=10 * 1024 * 1024,
+            help_text=_('If you provide a logo image, we will by default not show your event name and date '
+                        'in the page header. By default, we show your logo with a size of up to 1140x120 pixels. You '
+                        'can increase the size with the setting below. We recommend not using small details on the picture '
+                        'as it will be resized on smaller screens.')
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'image/png', 'image/jpeg', 'image/gif'
+            ],
+            max_size=10 * 1024 * 1024,
+        )
+
     },
     'logo_image_large': {
         'default': 'False',
-        'type': bool
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_('Use header image in its full size'),
+            help_text=_('We recommend to upload a picture at least 1170 pixels wide.'),
+        )
     },
     'logo_show_title': {
         'default': 'True',
-        'type': bool
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_('Show event title even if a header image is present'),
+            help_text=_('The title will only be shown on the event front page.'),
+        )
     },
     'organizer_logo_image': {
         'default': None,
-        'type': File
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Header image'),
+            ext_whitelist=(".png", ".jpg", ".gif", ".jpeg"),
+            max_size=10 * 1024 * 1024,
+            help_text=_('If you provide a logo image, we will by default not show your organization name '
+                        'in the page header. By default, we show your logo with a size of up to 1140x120 pixels. You '
+                        'can increase the size with the setting below. We recommend not using small details on the picture '
+                        'as it will be resized on smaller screens.')
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'image/png', 'image/jpeg', 'image/gif'
+            ],
+            max_size=10 * 1024 * 1024,
+        )
     },
     'organizer_logo_image_large': {
         'default': 'False',
@@ -1810,11 +1897,43 @@ Your {event} team"""))
     },
     'og_image': {
         'default': None,
-        'type': File
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Social media image'),
+            ext_whitelist=(".png", ".jpg", ".gif", ".jpeg"),
+            max_size=10 * 1024 * 1024,
+            help_text=_('This picture will be used as a preview if you post links to your ticket shop on social media. '
+                        'Facebook advises to use a picture size of 1200 x 630 pixels, however some platforms like '
+                        'WhatsApp and Reddit only show a square preview, so we recommend to make sure it still looks good '
+                        'only the center square is shown. If you do not fill this, we will use the logo given above.')
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'image/png', 'image/jpeg', 'image/gif'
+            ],
+            max_size=10 * 1024 * 1024,
+        )
     },
     'invoice_logo_image': {
         'default': None,
-        'type': File
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Logo image'),
+            ext_whitelist=(".png", ".jpg", ".gif", ".jpeg"),
+            required=False,
+            max_size=10 * 1024 * 1024,
+            help_text=_('We will show your logo with a maximal height and width of 2.5 cm.')
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'image/png', 'image/jpeg', 'image/gif'
+            ],
+            max_size=10 * 1024 * 1024,
+        )
     },
     'frontpage_text': {
         'default': '',
@@ -1878,6 +1997,19 @@ Your {event} team"""))
                         "why you need information from them.")
         )
     },
+    'checkout_success_text': {
+        'default': '',
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_("Additional success message"),
+            help_text=_("This message will be shown after an order has been created successfully. It will be shown in additional "
+                        "to the default text."),
+            widget_kwargs={'attrs': {'rows': '2'}},
+            widget=I18nTextarea
+        )
+    },
     'checkout_phone_helptext': {
         'default': '',
         'type': LazyI18nString,
@@ -2271,6 +2403,22 @@ PERSON_NAME_SCHEMES = OrderedDict([
             '_scheme': 'full_transcription',
         },
     }),
+    ('salutation_given_family', {
+        'fields': (
+            ('salutation', pgettext_lazy('person_name', 'Salutation'), 1),
+            ('given_name', _('Given name'), 2),
+            ('family_name', _('Family name'), 2),
+        ),
+        'concatenation': lambda d: ' '.join(
+            str(p) for p in (d.get(key, '') for key in ["given_name", "family_name"]) if p
+        ),
+        'sample': {
+            'salutation': pgettext_lazy('person_name_sample', 'Mr'),
+            'given_name': pgettext_lazy('person_name_sample', 'John'),
+            'family_name': pgettext_lazy('person_name_sample', 'Doe'),
+            '_scheme': 'salutation_given_family',
+        },
+    }),
     ('salutation_title_given_family', {
         'fields': (
             ('salutation', pgettext_lazy('person_name', 'Salutation'), 1),

src/pretix/base/shredder.py

@@ -82,6 +82,14 @@ class BaseDataShredder:
         """
         return False
 
+    @property
+    def require_download_confirmation(self):
+        """
+        Indicates whether the data of this shredder needs to be downloaded, before it is actually shredded. By default
+        this value is equal to the tax relevant flag.
+        """
+        return self.tax_relevant
+
     @property
     def verbose_name(self) -> str:
         """