Bump to 4.16.1

Currently translated at 100.0% (5085 of 5085 strings)

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

powered by weblate

.github/dependabot.yml

@@ -9,6 +9,7 @@ updates:
     directory: "/src"
     schedule:
       interval: "daily"
+    versioning-strategy: increase
   - package-ecosystem: "npm"
     directory: "/src/pretix/static/npm_dir"
     schedule:

.github/workflows/docs.yml

@@ -14,16 +14,22 @@ on:
       - 'src/pretix/static/**'
       - 'src/tests/**'
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
+env:
+  FORCE_COLOR: 1
+
 jobs:
   spelling:
     name: Spellcheck
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -31,7 +37,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install system packages
-        run: sudo apt update && sudo apt install enchant hunspell aspell-en
+        run: sudo apt update && sudo apt install enchant-2 hunspell aspell-en
       - name: Install Dependencies
         run: pip3 install -Ur requirements.txt
         working-directory: ./doc

.github/workflows/strings.yml

@@ -12,16 +12,22 @@ on:
       - 'doc/**'
       - 'src/pretix/locale/**'
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
+env:
+  FORCE_COLOR: 1
+
 jobs:
   compile:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     name: Check gettext syntax
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -40,14 +46,14 @@ jobs:
         run: python manage.py compilejsi18n
         working-directory: ./src
   spelling:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     name: Spellcheck
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -55,7 +61,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install system packages
-        run: sudo apt update && sudo apt install enchant hunspell hunspell-de-de aspell-en aspell-de
+        run: sudo apt update && sudo apt install enchant-2 hunspell hunspell-de-de aspell-en aspell-de
       - name: Install Dependencies
         run: pip3 install -e ".[dev]"
         working-directory: ./src

.github/workflows/style.yml

@@ -12,16 +12,22 @@ on:
       - 'src/pretix/locale/**'
       - 'src/pretix/static/**'
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
+env:
+  FORCE_COLOR: 1
+
 jobs:
   isort:
     name: isort
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -36,13 +42,13 @@ jobs:
         working-directory: ./src
   flake:
     name: flake8
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -57,13 +63,13 @@ jobs:
         working-directory: ./src
   licenseheader:
     name: licenseheaders
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: 3.9
       - name: Install Dependencies
         run: pip3 install licenseheaders
       - name: Run licenseheaders

.github/workflows/tests.yml

@@ -12,23 +12,29 @@ on:
       - 'doc/**'
       - 'src/pretix/locale/**'
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
+env:
+  FORCE_COLOR: 1
+
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     name: Tests
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9"]
+        python-version: ["3.7", "3.9", "3.10"]
         database: [sqlite, postgres, mysql]
         exclude:
           - database: mysql
-            python-version: "3.8"
+            python-version: "3.10"
           - database: mysql
             python-version: "3.9"
           - database: sqlite
             python-version: "3.7"
           - database: sqlite
-            python-version: "3.8"
+            python-version: "3.10"
     steps:
       - uses: actions/checkout@v2
       - uses: getong/mariadb-action@v1.1
@@ -55,9 +61,9 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
       - name: Install system dependencies
-        run: sudo apt update && sudo apt install gettext mariadb-client-10.3
+        run: sudo apt update && sudo apt install gettext mariadb-client
       - name: Install Python dependencies
-        run: pip3 install -e ".[dev]" mysqlclient psycopg2-binary
+        run: pip3 install --ignore-requires-python -e ".[dev]" mysqlclient psycopg2-binary  # We ignore that flake8 needs newer python as we don't run flake8 during tests
         working-directory: ./src
       - name: Run checks
         run: python manage.py check
@@ -75,5 +81,6 @@ jobs:
         uses: codecov/codecov-action@v1
         with:
           file: src/coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true
-        if: matrix.database == 'postgres' && matrix.python-version == '3.8'
+        if: matrix.database == 'postgres' && matrix.python-version == '3.10'

.readthedocs.requirements.txt

@@ -1 +0,0 @@
--r doc/requirements.txt

.readthedocs.yaml

@@ -0,0 +1,15 @@
+version: 2
+sphinx:
+   configuration: doc/conf.py
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.8"
+    nodejs: "16"
+  apt_packages:
+    - gettext
+python:
+  install:
+    - method: pip
+      path: ./src/
+    - requirements: doc/requirements.rtd.txt

doc/admin/config.rst

@@ -117,6 +117,9 @@ Example::
 ``loglevel``
     Set console and file log level (``DEBUG``, ``INFO``, ``WARNING``, ``ERROR`` or ``CRITICAL``). Defaults to ``INFO``.
 
+``request_id_header``
+    Specifies the name of a header that should be used for logging request IDs. Off by default.
+
 Locale settings
 ---------------
 
@@ -138,7 +141,7 @@ Database settings
 Example::
 
     [database]
-    backend=mysql
+    backend=postgresql
     name=pretix
     user=pretix
     password=abcd
@@ -146,7 +149,7 @@ Example::
     port=3306
 
 ``backend``
-    One of ``mysql``, ``sqlite3``, ``oracle`` and ``postgresql``.
+    One of ``mysql`` (deprecated), ``sqlite3`` and ``postgresql``.
     Default: ``sqlite3``.
 
     If you use MySQL, be sure to create your database using
@@ -160,7 +163,7 @@ Example::
     Connection details for the database connection. Empty by default.
 
 ``galera``
-    Indicates if the database backend is a MySQL/MariaDB Galera cluster and
+    (Deprecated) Indicates if the database backend is a MySQL/MariaDB Galera cluster and
     turns on some optimizations/special case handlers. Default: ``False``
 
 .. _`config-replica`:
@@ -191,7 +194,7 @@ Example::
 
     [urls]
     media=/media/
-    static=/media/
+    static=/static/
 
 ``media``
     The URL to be used to serve user-uploaded content. You should not need to modify
@@ -396,9 +399,9 @@ The two ``transport_options`` entries can be omitted in most cases.
 If they are present they need to be a valid JSON dictionary.
 For possible entries in that dictionary see the `Celery documentation`_.
 
-To use redis with sentinels set the broker or backend to ``sentinel://sentinel_host_1:26379;sentinal_host_2:26379/0``
+To use redis with sentinels set the broker or backend to ``sentinel://sentinel_host_1:26379;sentinel_host_2:26379/0``
 and the respective transport_options to ``{"master_name":"mymaster"}``.
-If your redis instances behind the sentinel have a password use ``sentinel://:my_password@sentinel_host_1:26379;sentinal_host_2:26379/0``.
+If your redis instances behind the sentinel have a password use ``sentinel://:my_password@sentinel_host_1:26379;sentinel_host_2:26379/0``.
 If your redis sentinels themselves have a password set the transport_options to ``{"master_name":"mymaster","sentinel_kwargs":{"password":"my_password"}}``.
 
 Sentry

doc/admin/index.rst

@@ -14,4 +14,5 @@ This documentation is for everyone who wants to install pretix on a server.
    maintainance
    scaling
    errors
+   mysql2postgres
    indexes

doc/admin/installation/docker_smallscale.rst

@@ -14,7 +14,7 @@ This has some trade-offs in terms of performance and isolation but allows a rath
              get it right. If you're not feeling comfortable managing a Linux server, check out our hosting and service
              offers at `pretix.eu`_.
 
-We tested this guide on the Linux distribution **Debian 8.0** but it should work very similar on other
+We tested this guide on the Linux distribution **Debian 11.0** but it should work very similar on other
 modern distributions, especially on all systemd-based ones.
 
 Requirements
@@ -26,7 +26,7 @@ installation guides):
 * `Docker`_
 * A SMTP server to send out mails, e.g. `Postfix`_ on your machine or some third-party server you have credentials for
 * A HTTP reverse proxy, e.g. `nginx`_ or Apache to allow HTTPS connections
-* A `PostgreSQL`_ 9.6+, `MySQL`_ 5.7+, or MariaDB 10.2.7+ database server
+* A `PostgreSQL`_ 9.6+ database server
 * A `redis`_ server
 
 We also recommend that you use a firewall, although this is not a pretix-specific recommendation. If you're new to
@@ -58,9 +58,6 @@ directory writable to the user that runs pretix inside the docker container::
 Database
 --------
 
-.. warning:: **Please use PostgreSQL for all new installations**. If you need to go for MySQL, make sure you run
-             **MySQL 5.7 or newer** or **MariaDB 10.2.7 or newer**.
-
 Next, we need a database and a database user. We can create these with any kind of database managing tool or directly on
 our database's shell. Please make sure that UTF8 is used as encoding for the best compatibility. You can check this with
 the following command::
@@ -86,13 +83,6 @@ Restart PostgreSQL after you changed these files::
 
 If you have a firewall running, you should also make sure that port 5432 is reachable from the ``172.17.0.1/16`` subnet.
 
-For MySQL, you can either also use network-based connections or mount the ``/var/run/mysqld/mysqld.sock`` socket into the docker container.
-When using MySQL, make sure you set the character set of the database to ``utf8mb4``, e.g. like this::
-
-    mysql > CREATE DATABASE pretix DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_unicode_ci;
-
-You will also need to make sure that ``sql_mode`` in your ``my.cnf`` file does **not** include ``ONLY_FULL_GROUP_BY``.
-
 Redis
 -----
 
@@ -152,15 +142,13 @@ Fill the configuration file ``/etc/pretix/pretix.cfg`` with the following conten
     trust_x_forwarded_proto=on
 
     [database]
-    ; Replace postgresql with mysql for MySQL
     backend=postgresql
     name=pretix
     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. Adjust
-    ; this to wherever your database is running, e.g. the name of a linked container
-    ; or of a mounted MySQL socket.
+    ; this to wherever your database is running, e.g. the name of a linked container.
     host=172.17.0.1
 
     [mail]
@@ -212,8 +200,6 @@ named ``/etc/systemd/system/pretix.service`` with the following content::
     [Install]
     WantedBy=multi-user.target
 
-When using MySQL and socket mounting, you'll need the additional flag ``-v /var/run/mysqld:/var/run/mysqld`` in the command.
-
 You can now run the following commands
 to enable and start the service::
 
@@ -339,7 +325,6 @@ workers, e.g. ``docker run … taskworker -Q notifications --concurrency 32``.
 .. _nginx: https://botleg.com/stories/https-with-lets-encrypt-and-nginx/
 .. _Let's Encrypt: https://letsencrypt.org/
 .. _pretix.eu: https://pretix.eu/
-.. _MySQL: https://dev.mysql.com/doc/refman/5.7/en/linux-installation-apt-repo.html
 .. _PostgreSQL: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-20-04
 .. _redis: https://blog.programster.org/debian-8-install-redis-server/
 .. _ufw: https://en.wikipedia.org/wiki/Uncomplicated_Firewall

doc/admin/installation/manual_smallscale.rst

@@ -12,7 +12,7 @@ solution with many things readily set-up, look at :ref:`dockersmallscale`.
              get it right. If you're not feeling comfortable managing a Linux server, check out our hosting and service
              offers at `pretix.eu`_.
 
-We tested this guide on the Linux distribution **Debian 10.0** but it should work very similar on other
+We tested this guide on the Linux distribution **Debian 11.6** but it should work very similar on other
 modern distributions, especially on all systemd-based ones.
 
 Requirements
@@ -23,7 +23,7 @@ installation guides):
 
 * A SMTP server to send out mails, e.g. `Postfix`_ on your machine or some third-party server you have credentials for
 * A HTTP reverse proxy, e.g. `nginx`_ or Apache to allow HTTPS connections
-* A `PostgreSQL`_ 9.6+, `MySQL`_ 5.7+, or MariaDB 10.2.7+ database server
+* A `PostgreSQL`_ 9.6+ database server
 * A `redis`_ server
 * A `nodejs`_ installation
 
@@ -47,9 +47,6 @@ In this guide, all code lines prepended with a ``#`` symbol are commands that yo
 Database
 --------
 
-.. warning:: **Please use PostgreSQL for all new installations**. If you need to go for MySQL, make sure you run
-             **MySQL 5.7 or newer** or **MariaDB 10.2.7 or newer**.
-
 Having the database server installed, we still need a database and a database user. We can create these with any kind
 of database managing tool or directly on our database's shell. Please make sure that UTF8 is used as encoding for the
 best compatibility. You can check this with the following command::
@@ -61,12 +58,6 @@ For PostgreSQL database creation, we would do::
     # sudo -u postgres createuser pretix
     # sudo -u postgres createdb -O pretix pretix
 
-When using MySQL, make sure you set the character set of the database to ``utf8mb4``, e.g. like this::
-
-    mysql > CREATE DATABASE pretix DEFAULT CHARACTER SET utf8mb4 DEFAULT COLLATE utf8mb4_unicode_ci;
-
-You will also need to make sure that ``sql_mode`` in your ``my.cnf`` file does **not** include ``ONLY_FULL_GROUP_BY``.
-
 Package dependencies
 --------------------
 
@@ -74,7 +65,7 @@ To build and run pretix, you will need the following debian packages::
 
     # apt-get install git build-essential python-dev python3-venv python3 python3-pip \
                       python3-dev libxml2-dev libxslt1-dev libffi-dev zlib1g-dev libssl-dev \
-                      gettext libpq-dev libmariadb-dev libjpeg-dev libopenjp2-7-dev
+                      gettext libpq-dev libjpeg-dev libopenjp2-7-dev
 
 Config file
 -----------
@@ -97,16 +88,12 @@ Fill the configuration file ``/etc/pretix/pretix.cfg`` with the following conten
     trust_x_forwarded_proto=on
 
     [database]
-    ; For MySQL, replace with "mysql"
     backend=postgresql
     name=pretix
     user=pretix
-    ; For MySQL, enter the user password. For PostgreSQL on the same host,
-    ; we don't need one because we can use peer authentification if our
-    ; PostgreSQL user matches our unix user.
+    ; For PostgreSQL on the same host, we don't need a password because we can use
+    ; peer authentication if our PostgreSQL user matches our unix user.
     password=
-    ; For MySQL, use local socket, e.g. /var/run/mysqld/mysqld.sock
-    ; For a remote host, supply an IP address
     ; For local postgres authentication, you can leave it empty
     host=
 
@@ -140,10 +127,6 @@ We now install pretix, its direct dependencies and gunicorn::
 
     (venv)$ pip3 install pretix gunicorn
 
-If you're running MySQL, also install the client library::
-
-    (venv)$ pip3 install mysqlclient
-
 Note that you need Python 3.7 or newer. You can find out your Python version using ``python -V``.
 
 We also need to create a data directory::
@@ -318,12 +301,32 @@ example::
     (venv)$ python -m pretix rebuild
     # systemctl restart pretix-web pretix-worker
 
+System updates
+--------------
+
+After system updates, such as updates to a new Ubuntu or Debian release, you might be using a new Python version.
+That's great, but requires some adjustments. First, adjust any old version paths in your nginx configuration file.
+Then, re-create your Python environment::
+
+    $ source /var/pretix/venv/bin/activate
+    (venv)$ pip3 freeze > /tmp/pip-backup.txt
+    $ rm -rf /var/pretix/venv
+    $ python3 -m venv /var/pretix/venv
+    $ source /var/pretix/venv/bin/activate
+    (venv)$ pip3 install -U pip wheel setuptools
+    (venv)$ pip3 install -r /tmp/pip-backup.txt
+
+Then, proceed like after any plugin installation::
+
+    (venv)$ python -m pretix migrate
+    (venv)$ python -m pretix rebuild
+    (venv)$ python -m pretix updatestyles
+    # systemctl restart pretix-web pretix-worker
 
 .. _Postfix: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-16-04
 .. _nginx: https://botleg.com/stories/https-with-lets-encrypt-and-nginx/
 .. _Let's Encrypt: https://letsencrypt.org/
 .. _pretix.eu: https://pretix.eu/
-.. _MySQL: https://dev.mysql.com/doc/refman/5.7/en/linux-installation-apt-repo.html
 .. _PostgreSQL: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-20-04
 .. _redis: https://blog.programster.org/debian-8-install-redis-server/
 .. _ufw: https://en.wikipedia.org/wiki/Uncomplicated_Firewall

doc/admin/maintainance.rst

@@ -17,11 +17,11 @@ Backups
 There are essentially two things which you should create backups of:
 
 Database
-    Your SQL database (MySQL or PostgreSQL). This is critical and you should **absolutely
-    always create automatic backups of your database**. There are tons of tutorials on the
-    internet on how to do this, and the exact process depends on the choice of your database.
-    For MySQL, see ``mysqldump`` and for PostgreSQL, see the ``pg_dump`` tool. You probably
-    want to create a cronjob that does the backups for you on a regular schedule.
+    Your SQL database. This is critical and you should **absolutely always create automatic
+    backups of your database**. There are tons of tutorials on the internet on how to do this,
+    and the exact process depends on the choice of your database. For PostgreSQL, see the
+    ``pg_dump`` tool. You probably want to create a cronjob that does the backups for you on a
+    regular schedule.
 
 Data directory
     The data directory of your pretix configuration might contain some things that you should

doc/admin/mysql2postgres.rst

@@ -0,0 +1,148 @@
+.. highlight:: none
+
+Migrating from MySQL/MariaDB to PostgreSQL
+==========================================
+
+Our recommended database for all production installations is PostgreSQL. Support for MySQL/MariaDB will be removed in
+pretix 5.0.
+
+In order to follow this guide, your pretix installation needs to be a version that fully supports MySQL/MariaDB. If you
+already upgraded to pretix 5.0, downgrade back to the last 4.x release using ``pip``.
+
+.. note:: We have tested this guide carefully, but we can't assume any liability for its correctness. The data loss
+          risk should be low as long as pretix is not running while you do the migration. If you are a pretix Enterprise
+          customer, feel free to reach out in advance if you want us to support you along the way.
+
+Update database schema
+----------------------
+
+Before you start, make sure your database schema is up to date::
+
+    # sudo -u pretix -s
+    $ source /var/pretix/venv/bin/activate
+    (venv)$ python -m pretix migrate
+
+Install PostgreSQL
+------------------
+
+Now, install and set up a PostgreSQL server. For a local installation on Debian or Ubuntu, use::
+
+    # apt install postgresql
+
+Having the database server installed, we still need a database and a database user. We can create these with any kind
+of database managing tool or directly on our database's shell. Please make sure that UTF8 is used as encoding for the
+best compatibility. You can check this with the following command::
+
+    # sudo -u postgres psql -c 'SHOW SERVER_ENCODING'
+
+Without Docker
+""""""""""""""
+
+For our standard manual installation, create the database and user like this::
+
+    # sudo -u postgres createuser pretix
+    # sudo -u postgres createdb -O pretix pretix
+
+With Docker
+"""""""""""
+
+For our standard docker installation, create the database and user like this::
+
+    # sudo -u postgres createuser -P pretix
+    # sudo -u postgres createdb -O pretix pretix
+
+Make sure that your database listens on the network. If PostgreSQL on the same same host as docker, but not inside a docker container, we recommend that you just listen on the Docker interface by changing the following line in ``/etc/postgresql/<version>/main/postgresql.conf``::
+
+    listen_addresses = 'localhost,172.17.0.1'
+
+You also need to add a new line to ``/etc/postgresql/<version>/main/pg_hba.conf`` to allow network connections to this user and database::
+
+    host    pretix          pretix          172.17.0.1/16           md5
+
+Restart PostgreSQL after you changed these files::
+
+    # systemctl restart postgresql
+
+If you have a firewall running, you should also make sure that port 5432 is reachable from the ``172.17.0.1/16`` subnet.
+
+Of course, instead of all this you can also run a PostgreSQL docker container and link it to the pretix container.
+
+Stop pretix
+-----------
+
+To prevent any more changes to your data, stop pretix from running::
+
+    # systemctl stop pretix-web pretix-worker
+
+Change configuration
+--------------------
+
+Change the database configuration in your ``/etc/pretix/pretix.cfg`` file::
+
+    [database]
+    backend=postgresql
+    name=pretix
+    user=pretix
+    password=  ; only required for docker or remote database, can be kept empty for local auth
+    host=      ; set to 172.17.0.1 in docker setup, keep empty for local auth
+
+
+Create database schema
+-----------------------
+
+To create the schema in your new PostgreSQL database, use the following commands::
+
+    # sudo -u pretix -s
+    $ source /var/pretix/venv/bin/activate
+    (venv)$ python -m pretix migrate
+
+
+Migrate your data
+-----------------
+
+Install ``pgloader``::
+
+    # apt install pgloader
+
+Create a new file ``/tmp/pretix.load``, replacing the MySQL and PostgreSQL connection strings with the correct user names, passwords, and/or database names::
+
+    LOAD DATABASE
+        FROM mysql://pretix:password@localhost/pretix  -- replace with mysql://username:password@hostname/dbname
+        INTO postgresql:///pretix                      -- replace with dbname
+
+    WITH data only, include no drop, truncate, disable triggers,
+         create no indexes, drop indexes, reset sequences
+
+    ALTER SCHEMA 'pretix' RENAME TO 'public'           -- replace pretix with the name of the MySQL database
+
+    ALTER TABLE NAMES MATCHING ~/.*/
+        SET SCHEMA 'public'
+
+    SET timezone TO '+00:00'
+
+    SET PostgreSQL PARAMETERS
+         maintenance_work_mem to '128MB',
+         work_mem to '12MB';
+
+Then, run::
+
+    # sudo -u postgres pgloader /tmp/pretix.load
+
+The output should end with a table summarizing the results for every table. You can ignore warnings about type casts
+and missing constraints.
+
+Afterwards, delete the file again::
+
+    # rm -rf /tmp/pretix.load
+
+Start pretix
+------------
+
+Now, restart pretix. Maybe stop your MySQL server as a verification step that you are no longer using it::
+
+    # systemctl stop mariadb
+    # systemctl start pretix-web pretix-worker
+
+And you're done! After you've verified everything has been copied correctly, you can delete the old MySQL database.
+
+.. note:: Don't forget to update your backup process to back up your PostgreSQL database instead of your MySQL database now.

doc/admin/scaling.rst

@@ -42,7 +42,7 @@ A pretix installation usually consists of the following components which run per
 
 * ``pretix-worker`` is a Celery-based application that processes tasks that should be run asynchronously outside of the web application process.
 
-* A **SQL database** keeps all the important data and processes the actual transactions. We recommend using PostgreSQL, but MySQL/MariaDB works as well.
+* A **PostgreSQL database** keeps all the important data and processes the actual transactions.
 
 * A **web server** that terminates TLS and HTTP connections and forwards them to ``pretix-web``. In some cases, e.g. when serving static files, the web servers might return a response directly. We recommend using ``nginx``.
 
@@ -74,7 +74,7 @@ We recommend reading up on tuning your web server for high concurrency. For ngin
 processes and the number of connections each worker process accepts. Double-check that TLS session caching works, because TLS
 handshakes can get really expensive.
 
-During a traffic peak, your web server will be able to make us of more CPU resources, while memory usage will stay comparatively low,
+During a traffic peak, your web server will be able to make use of more CPU resources, while memory usage will stay comparatively low,
 so if you invest in more hardware here, invest in more and faster CPU cores.
 
 Make sure that pretix' static files (such as CSS and JavaScript assets) as well as user-uploaded media files (event logos, etc)

doc/api/fundamentals.rst

@@ -48,10 +48,11 @@ Possible permissions are:
 Compatibility
 -------------
 
-We currently see pretix' API as a beta-stage feature. We therefore do not give any guarantees
-for compatibility between feature releases of pretix (such as 1.5 and 1.6). However, as always,
-we try not to break things when we don't need to. Any backwards-incompatible changes will be
-prominently noted in the release notes.
+We try to avoid any breaking changes to our API to avoid hassle on your end. If possible, we'll
+build new features in a way that keeps all pre-existing API usage unchanged. In some cases,
+this might not be possible or only possible with restrictions. In these case, any
+backwards-incompatible changes will be prominently noted in the "Changes to the REST API"
+section of our release notes. If possible, we will announce them multiple releases in advance.
 
 We treat the following types of changes as *backwards-compatible* so we ask you to make sure
 that your clients can deal with them properly:
@@ -60,6 +61,7 @@ that your clients can deal with them properly:
 * Support of new HTTP methods for a given API endpoint
 * Support of new query parameters for a given API endpoint
 * New fields contained in API responses
+* New possible values of enumeration-like fields
 * Response body structure or message texts on failed requests (``4xx``, ``5xx`` response codes)
 
 We treat the following types of changes as *backwards-incompatible*:
@@ -190,6 +192,9 @@ Relative date         *either* String in ISO 8601  ``"2017-12-27"``,
 File                  URL in responses, ``file:``  ``"https://…"``, ``"file:…"``
                       specifiers in requests
                       (see below).
+Date range            *either* two dates separated ``2022-03-18/2022-03-23``, ``2022-03-18/``,
+                      by ``/`` *or* the name of a  ``/2022-03-23``, ``week_this``, ``week_next``,
+                      defined range.               ``month_this``
 ===================== ============================ ===================================
 
 Query parameters

doc/api/resources/carts.rst

@@ -17,8 +17,8 @@ The cart position resource contains the following public fields:
 Field                                 Type                       Description
 ===================================== ========================== =======================================================
 id                                    integer                    Internal ID of the cart position
-cart_id                               string                     Identifier of the cart this belongs to. Needs to end
-                                                                 in "@api" for API-created positions.
+cart_id                               string                     Identifier of the cart this belongs to, needs to end
+                                                                 in "@api" for API-created positions
 datetime                              datetime                   Time of creation
 expires                               datetime                   The cart position will expire at this time and no longer block quota
 item                                  integer                    ID of the item
@@ -29,22 +29,23 @@ attendee_name_parts                   object of strings          Composition of
 attendee_email                        string                     Specified attendee email address for this position (or ``null``)
 voucher                               integer                    Internal ID of the voucher used for this position (or ``null``)
 addon_to                              integer                    Internal ID of the position this position is an add-on for (or ``null``)
-subevent                              integer                    ID of the date inside an event series this position belongs to (or ``null``).
+is_bundled                            boolean                    If ``addon_to`` is set, this shows whether this is a bundled product or an addon product
+subevent                              integer                    ID of the date inside an event series this position belongs to (or ``null``)
 answers                               list of objects            Answers to user-defined questions
 ├ question                            integer                    Internal ID of the answered question
 ├ answer                              string                     Text representation of the answer
 ├ 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
-seat                                  objects                    The assigned seat. Can be ``null``.
+seat                                  objects                    The assigned seat (or ``null``)
 ├ id                                  integer                    Internal ID of the seat instance
 ├ name                                string                     Human-readable seat name
 └ seat_guid                           string                     Identifier of the seat within the seating plan
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.0
+.. versionchanged:: 4.14
 
-   This ``seat`` attribute has been added.
+   This ``is_bundled`` attribute has been added and the cart creation endpoints have been updated.
 
 
 Cart position endpoints
@@ -87,6 +88,7 @@ Cart position endpoints
             "attendee_email": null,
             "voucher": null,
             "addon_to": null,
+            "is_bundled": false,
             "subevent": null,
             "datetime": "2018-06-11T10:00:00Z",
             "expires": "2018-06-11T10:00:00Z",
@@ -133,6 +135,7 @@ Cart position endpoints
         "attendee_email": null,
         "voucher": null,
         "addon_to": null,
+        "is_bundled": false,
         "subevent": null,
         "datetime": "2018-06-11T10:00:00Z",
         "expires": "2018-06-11T10:00:00Z",
@@ -168,7 +171,7 @@ Cart position endpoints
 
        * does not validate if the event's ticket sales are already over or haven't started
 
-       * does not support add-on products at the moment
+       * does not validate constraints on add-on products at the moment
 
        * does not check or calculate prices but believes any prices you send
 
@@ -176,6 +179,8 @@ Cart position endpoints
 
        * does not support file upload questions
 
+       Note that more validation might be added in the future, so please do not rely on missing validation.
+
    You can supply the following fields of the resource:
 
    * ``cart_id`` (optional, needs to end in ``@api``)
@@ -190,6 +195,8 @@ Cart position endpoints
    * ``includes_tax`` (optional, **deprecated**, do not use, will be removed)
    * ``sales_channel`` (optional)
    * ``voucher`` (optional, expect a voucher code)
+   * ``addons`` (optional, expect a list of nested objects of cart positions)
+   * ``bundled`` (optional, expect a list of nested objects of cart positions)
    * ``answers``
 
       * ``question``
@@ -221,6 +228,12 @@ Cart position endpoints
             "options": []
           }
         ],
+        "addons": [
+          {
+            "item": 2,
+            "variation": null,
+          }
+        ],
         "subevent": null
       }
 
@@ -232,7 +245,7 @@ Cart position endpoints
       Vary: Accept
       Content-Type: application/json
 
-      (Full cart position resource, see above.)
+      (Full cart position resource, see above, with additional nested objects "addons" and "bundled".)
 
    :param organizer: The ``slug`` field of the organizer of the event to create a position for
    :param event: The ``slug`` field of the event to create a position for
@@ -244,8 +257,8 @@ Cart position endpoints
 
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/cartpositions/bulk_create/
 
-   Creates multiple new cart position. This operation is deliberately not atomic, so each cart position can succeed
-   or fail individually, so the response code of the response is not the only thing to look at!
+   Creates multiple new cart position. **This operation is deliberately not atomic, so each cart position can succeed
+   or fail individually, so the response code of the response is not the only thing to look at!**
 
    .. warning:: This endpoint is considered **experimental**. It might change at any time without prior notice.
 

doc/api/resources/checkinlists.rst

@@ -39,23 +39,6 @@ exit_all_at                           datetime                   Automatically c
 addon_match                           boolean                    If ``true``, tickets on this list can be redeemed by scanning their parent ticket if this still leads to an unambiguous match.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.9
-
-    The ``subevent`` attribute may now be ``null`` inside event series. The ``allow_multiple_entries``,
-    ``allow_entry_after_exit``, and ``rules`` attributes have been added.
-
-.. versionchanged:: 3.11
-
-    The ``subevent_match`` and ``exclude`` query parameters have been added.
-
-.. versionchanged:: 3.12
-
-    The ``exit_all_at`` attribute has been added.
-
-.. versionchanged:: 3.17
-
-    The ``ends_after`` and ``expand`` query parameters have been added.
-
 .. versionchanged:: 4.12
 
     The ``addon_match`` attribute has been added.
@@ -115,6 +98,8 @@ Endpoints
    :query string ends_after: Exclude all check-in lists attached to a sub-event that is already in the past at the given time.
    :query string expand: Expand a field into a full object. Currently only ``subevent`` is supported. Can be passed multiple times.
    :query string exclude: Exclude a field from the output, e.g. ``checkin_count``. Can be used as a performance optimization. Can be passed multiple times.
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``id``, ``name``, and ``subevent__date_from``,
+                           Default: ``subevent__date_from,name``
    :param organizer: The ``slug`` field of the organizer to fetch
    :param event: The ``slug`` field of the event to fetch
    :statuscode 200: no error

doc/api/resources/events.rst

@@ -52,34 +52,9 @@ sales_channels                        list                       A list of sales
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 3.3
-
-   The attributes ``geo_lat`` and ``geo_lon`` have been added.
-
-.. versionchanged:: 3.4
-
-   The attribute ``timezone`` has been added.
-
-.. versionchanged:: 3.7
-
-   The attribute ``item_meta_properties`` has been added.
-
-.. versionchanged:: 3.12
-
-   The attribute ``valid_keys`` has been added.
-
-.. versionchanged:: 3.14
-
-    The attribute ``sales_channels`` has been added.
-
-
 Endpoints
 ---------
 
-.. versionchanged:: 3.3
-
-    The events resource can now be filtered by meta data attributes.
-
 .. versionchanged:: 4.0
 
     The ``clone_from`` parameter has been added to the event creation endpoint.
@@ -567,10 +542,6 @@ information about the properties.
 .. warning:: This API is intended for advanced users. Even though we take care to validate your input, you will be
              able to break your event using this API by creating situations of conflicting settings. Please take care.
 
-.. versionchanged:: 3.6
-
-   Initial support for settings has been added to the API.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/settings/
 
    Get current values of event settings.

doc/api/resources/exporters.rst

@@ -6,10 +6,6 @@ Data exporters
 pretix and it's plugins include a number of data exporters that allow you to bulk download various data from pretix in
 different formats. This page shows you how to use these exporters through the API.
 
-.. versionchanged:: 3.13
-
-   This feature has been added to the API.
-
 .. warning::
 
    While we consider the methods listed on this page to be a stable API, the availability and specific input field

doc/api/resources/giftcards.rst

@@ -40,10 +40,6 @@ text                                  string                     Custom text of
 Endpoints
 ---------
 
-.. versionadded:: 3.14
-
-   The transaction list endpoint was added.
-
 .. http:get:: /api/v1/organizers/(organizer)/giftcards/
 
    Returns a list of all gift cards issued by a given organizer.
@@ -257,10 +253,6 @@ Endpoints
         "value": "15.37"
       }
 
-   .. versionchanged:: 3.5
-
-      This endpoint now returns status code ``409`` if the transaction would lead to a negative gift card value.
-
    :param organizer: The ``slug`` field of the organizer to modify
    :param id: The ``id`` field of the gift card to modify
    :query boolean include_accepted: Also show gift cards issued by other organizers that are accepted by this organizer.

doc/api/resources/invoices.rst

@@ -108,16 +108,6 @@ internal_reference                    string                     Customer's refe
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 3.4
-
-   The attribute ``lines.number`` has been added.
-
-.. versionchanged:: 3.17
-
-   The attribute ``invoice_to_*``, ``invoice_from_*``, ``custom_field``, ``lines.item``, ``lines.variation``, ``lines.event_date_from``,
-   ``lines.event_date_to``, and ``lines.attendee_name`` have been added.
-   ``refers`` now returns an invoice number including the prefix.
-
 .. versionchanged:: 4.1
 
    The attributes ``fee_type`` and ``fee_internal_type`` have been added.

doc/api/resources/item_variations.rst

@@ -43,8 +43,13 @@ available_until                       datetime                   The last date t
 hide_without_voucher                  boolean                    If ``true``, this variation is only shown during the voucher
                                                                  redemption process, but not in the normal shop
                                                                  frontend.
+meta_data                             object                     Values set for event-specific meta data parameters.
 ===================================== ========================== =======================================================
 
+.. versionchanged:: 4.16
+
+   The ``meta_data`` attribute has been added.
+
 Endpoints
 ---------
 
@@ -94,6 +99,7 @@ Endpoints
             "default_price": "223.00",
             "price": 223.0,
             "original_price": null,
+            "meta_data": {}
           },
           {
             "id": 3,
@@ -108,7 +114,8 @@ Endpoints
             "description": {},
             "position": 1,
             "default_price": null,
-            "price": 15.0
+            "price": 15.0,
+            "meta_data": {}
           }
         ]
       }
@@ -161,7 +168,8 @@ Endpoints
         "available_until": null,
         "hide_without_voucher": false,
         "description": null,
-        "position": 0
+        "position": 0,
+        "meta_data": {}
       }
 
    :param organizer: The ``slug`` field of the organizer to fetch
@@ -198,7 +206,8 @@ Endpoints
         "available_until": null,
         "hide_without_voucher": false,
         "description": null,
-        "position": 0
+        "position": 0,
+        "meta_data": {}
       }
 
    **Example response**:
@@ -225,7 +234,8 @@ Endpoints
         "available_until": null,
         "hide_without_voucher": false,
         "description": null,
-        "position": 0
+        "position": 0,
+        "meta_data": {}
       }
 
    :param organizer: The ``slug`` field of the organizer of the event/item to create a variation for
@@ -283,7 +293,8 @@ Endpoints
         "available_until": null,
         "hide_without_voucher": false,
         "description": null,
-        "position": 1
+        "position": 1,
+        "meta_data": {}
       }
 
    :param organizer: The ``slug`` field of the organizer to modify

doc/api/resources/items.rst

@@ -35,6 +35,12 @@ tax_rule                              integer                    The internal ID
 admission                             boolean                    ``true`` for items that grant admission to the event
                                                                  (such as primary tickets) and ``false`` for others
                                                                  (such as add-ons or merchandise).
+personalized                          boolean                    ``true`` for items that require personalization according
+                                                                 to event settings. Only affects system-level fields, not
+                                                                 custom questions. Currently only allowed for products with
+                                                                 ``admission`` set to ``true``. For backwards compatibility,
+                                                                 when creating new items and this field is not given, it defaults
+                                                                 to the same value as ``admission``.
 position                              integer                    An integer, used for sorting
 picture                               file                       A product picture to be displayed in the shop
                                                                  (can be ``null``).
@@ -123,6 +129,7 @@ variations                            list of objects            A list with one
 ├ hide_without_voucher                boolean                    If ``true``, this variation is only shown during the voucher
                                                                  redemption process, but not in the normal shop
                                                                  frontend.
+├ meta_data                           object                     Values set for event-specific meta data parameters.
 └ position                            integer                    An integer, used for sorting
 addons                                list of objects            Definition of add-ons that can be chosen for this item.
                                                                  Only writable during creation,
@@ -146,14 +153,6 @@ bundles                               list of objects            Definition of b
 meta_data                             object                     Values set for event-specific meta data parameters.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.7
-
-   The attribute ``meta_data`` has been added.
-
-.. versionchanged:: 3.10
-
-   The attribute ``multi_allowed`` has been added to ``addons``.
-
 .. versionchanged:: 4.0
 
    The attributes ``require_membership``, ``require_membership_types``, ``grant_membership_type``, ``grant_membership_duration_like_event``,
@@ -163,6 +162,10 @@ meta_data                             object                     Values set for
 
    The attributes ``require_membership_hidden`` attribute has been added.
 
+.. versionchanged:: 4.16
+
+   The ``variations[x].meta_data`` attribute has been added. The ``personalized`` attribute has been added.
+
 Notes
 -----
 
@@ -216,6 +219,7 @@ Endpoints
             "tax_rate": "0.00",
             "tax_rule": 1,
             "admission": false,
+            "personalized": false,
             "issue_giftcard": false,
             "meta_data": {},
             "position": 0,
@@ -255,6 +259,7 @@ Endpoints
                  "available_until": null,
                  "hide_without_voucher": false,
                  "description": null,
+                 "meta_data": {},
                  "position": 0
               },
               {
@@ -270,6 +275,7 @@ Endpoints
                  "available_until": null,
                  "hide_without_voucher": false,
                  "description": null,
+                 "meta_data": {},
                  "position": 1
               }
             ],
@@ -330,6 +336,7 @@ Endpoints
         "tax_rate": "0.00",
         "tax_rule": 1,
         "admission": false,
+        "personalized": false,
         "issue_giftcard": false,
         "meta_data": {},
         "position": 0,
@@ -369,6 +376,7 @@ Endpoints
              "available_from": null,
              "available_until": null,
              "hide_without_voucher": false,
+             "meta_data": {},
              "position": 0
           },
           {
@@ -384,6 +392,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 1
           }
         ],
@@ -425,6 +434,7 @@ Endpoints
         "tax_rate": "0.00",
         "tax_rule": 1,
         "admission": false,
+        "personalized": false,
         "issue_giftcard": false,
         "meta_data": {},
         "position": 0,
@@ -463,6 +473,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 0
           },
           {
@@ -478,6 +489,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 1
           }
         ],
@@ -507,6 +519,7 @@ Endpoints
         "tax_rate": "0.00",
         "tax_rule": 1,
         "admission": false,
+        "personalized": false,
         "issue_giftcard": false,
         "meta_data": {},
         "position": 0,
@@ -546,6 +559,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 0
           },
           {
@@ -561,6 +575,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 1
           }
         ],
@@ -621,6 +636,7 @@ Endpoints
         "tax_rate": "0.00",
         "tax_rule": 1,
         "admission": false,
+        "personalized": false,
         "issue_giftcard": false,
         "meta_data": {},
         "position": 0,
@@ -660,6 +676,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 0
           },
           {
@@ -675,6 +692,7 @@ Endpoints
              "available_until": null,
              "hide_without_voucher": false,
              "description": null,
+             "meta_data": {},
              "position": 1
           }
         ],

doc/api/resources/orders.rst

@@ -98,30 +98,6 @@ last_modified                         datetime                   Last modificati
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 3.5
-
-   The ``order.fees.canceled`` attribute has been added.
-
-.. versionchanged:: 3.8
-
-   The ``reactivate`` operation has been added.
-
-.. versionchanged:: 3.10
-
-   The ``search`` query parameter has been added.
-
-.. versionchanged:: 3.11
-
-   The ``exclude`` and ``subevent_after`` query parameter has been added.
-
-.. versionchanged:: 3.13
-
-   The ``subevent_before`` query parameter has been added.
-
-.. versionchanged:: 3.14
-
-   The ``phone`` attribute has been added.
-
 .. versionchanged:: 4.0
 
    The ``customer`` attribute has been added.
@@ -142,6 +118,10 @@ last_modified                         datetime                   Last modificati
 
    The ``order.fees.id`` attribute has been added.
 
+.. versionchanged:: 4.15
+
+   The ``include`` query parameter has been added.
+
 
 .. _order-position-resource:
 
@@ -178,6 +158,7 @@ tax_rule                              integer                    The ID of the u
 secret                                string                     Secret code printed on the tickets for validation
 addon_to                              integer                    Internal ID of the position this position is an add-on for (or ``null``)
 subevent                              integer                    ID of the date inside an event series this position belongs to (or ``null``).
+discount                              integer                    ID of a discount that has been used during the creation of this position in some way (or ``null``).
 pseudonymization_id                   string                     A random ID, e.g. for use in lead scanning apps
 checkins                              list of objects            List of **successful** check-ins with this ticket
 ├ id                                  integer                    Internal ID of the check-in event
@@ -205,27 +186,6 @@ pdf_data                              object                     Data object req
                                                                  ``pdf_data=true`` query parameter to your request.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.3
-
-  The ``url`` of a ticket ``download`` can now also return a ``text/uri-list`` instead of a file. See
-  :ref:`order-position-ticket-download` for details.
-
-.. versionchanged:: 3.5
-
-  The attribute ``canceled`` has been added.
-
-.. versionchanged:: 3.8
-
-  The attributes ``company``, ``street``, ``zipcode``, ``city``, ``country``, and ``state`` have been added.
-
-.. versionchanged:: 3.9
-
-  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
@@ -272,15 +232,20 @@ created                               datetime                   Date and time o
 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
+details                               object                     Refund-specific information. This is a dictionary
+                                                                 with various fields that can be different between
+                                                                 payment providers, versions, payment states, etc. If
+                                                                 you read this field, you always need to be able to
+                                                                 deal with situations where values that you expect are
+                                                                 missing. Mostly, the field contains various IDs that
+                                                                 can be used for matching with other systems. If a
+                                                                 payment provider does not implement this feature,
+                                                                 the object is empty.
 ===================================== ========================== =======================================================
 
 List of all orders
 ------------------
 
-.. versionchanged:: 3.5
-
-   The ``include_canceled_positions`` and ``include_canceled_fees`` query parameters have been added.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/
 
    Returns a list of all orders within a given event.
@@ -371,6 +336,7 @@ List of all orders
                 "secret": "z3fsn8jyufm5kpk768q69gkbyr5f4h6w",
                 "addon_to": null,
                 "subevent": null,
+                "discount": null,
                 "pseudonymization_id": "MQLJvANO3B",
                 "seat": null,
                 "checkins": [
@@ -447,6 +413,7 @@ List of all orders
    :query datetime subevent_after: Only return orders that contain a ticket for a subevent taking place after the given date. This is an exclusive after, and it considers the **end** of the subevent (or its start, if the end is not set).
    :query datetime subevent_before: Only return orders that contain a ticket for a subevent taking place after the given date. This is an exclusive before, and it considers the **start** of the subevent.
    :query string exclude: Exclude a field from the output, e.g. ``fees`` or ``positions.downloads``. Can be used as a performance optimization. Can be passed multiple times.
+   :query string include: Include only the given field in the output, e.g. ``fees`` or ``positions.downloads``. Can be used as a performance optimization. Can be passed multiple times. ``include`` is applied before ``exclude``, so ``exclude`` takes precedence.
    :param organizer: The ``slug`` field of the organizer to fetch
    :param event: The ``slug`` field of the event to fetch
    :resheader X-Page-Generated: The server time at the beginning of the operation. If you're using this API to fetch
@@ -458,10 +425,6 @@ List of all orders
 Fetching individual orders
 --------------------------
 
-.. versionchanged:: 3.5
-
-   The ``include_canceled_positions`` and ``include_canceled_fees`` query parameters have been added.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/
 
    Returns information on one order, identified by its order code.
@@ -546,6 +509,7 @@ Fetching individual orders
             "secret": "z3fsn8jyufm5kpk768q69gkbyr5f4h6w",
             "addon_to": null,
             "subevent": null,
+            "discount": null,
             "pseudonymization_id": "MQLJvANO3B",
             "seat": null,
             "checkins": [
@@ -1035,10 +999,6 @@ Creating orders
 Order state operations
 ----------------------
 
-.. versionchanged:: 3.12
-
-   The ``mark_paid`` operation now takes a ``send_email`` parameter.
-
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/mark_paid/
 
    Marks a pending or expired order as successfully paid.
@@ -1440,10 +1400,6 @@ Sending e-mails
 List of all order positions
 ---------------------------
 
-.. versionchanged:: 3.5
-
-   The ``include_canceled_positions`` and ``include_canceled_fees`` query parameters have been added.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orderpositions/
 
    Returns a list of all order positions within a given event.
@@ -1487,6 +1443,7 @@ List of all order positions
             "tax_rule": null,
             "tax_value": "0.00",
             "secret": "z3fsn8jyufm5kpk768q69gkbyr5f4h6w",
+            "discount": null,
             "pseudonymization_id": "MQLJvANO3B",
             "seat": null,
             "addon_to": null,
@@ -1597,6 +1554,7 @@ Fetching individual positions
         "secret": "z3fsn8jyufm5kpk768q69gkbyr5f4h6w",
         "addon_to": null,
         "subevent": null,
+        "discount": null,
         "pseudonymization_id": "MQLJvANO3B",
         "seat": null,
         "checkins": [
@@ -1696,10 +1654,6 @@ Order position ticket download
 Manipulating individual positions
 ---------------------------------
 
-.. versionchanged:: 3.15
-
-   The ``PATCH`` method has been added for individual positions.
-
 .. versionchanged:: 4.8
 
    The ``PATCH`` method now supports changing items, variations, subevents, seats, prices, and tax rules.
@@ -1925,7 +1879,7 @@ otherwise, such as splitting an order or changing fees.
 
    .. sourcecode:: http
 
-      POST /api/v1/organizers/bigevents/events/sampleconf/orders/ABC12/ HTTP/1.1
+      POST /api/v1/organizers/bigevents/events/sampleconf/orders/ABC12/change/ HTTP/1.1
       Host: pretix.eu
       Accept: application/json, text/javascript
       Content-Type: application/json
@@ -2006,14 +1960,6 @@ otherwise, such as splitting an order or changing fees.
 Order payment endpoints
 -----------------------
 
-.. versionchanged:: 3.6
-
-   Payments can now be created through the API.
-
-.. versionchanged:: 3.12
-
-   The ``confirm`` operation now takes a ``send_email`` parameter.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/orders/(code)/payments/
 
    Returns a list of all payments for an order.
@@ -2319,6 +2265,7 @@ Order refund endpoints
             "created": "2017-12-01T10:00:00Z",
             "execution_date": "2017-12-04T12:13:12Z",
             "comment": "Cancellation",
+            "details": {},
             "provider": "banktransfer"
           }
         ]
@@ -2362,6 +2309,7 @@ Order refund endpoints
         "created": "2017-12-01T10:00:00Z",
         "execution_date": "2017-12-04T12:13:12Z",
         "comment": "Cancellation",
+        "details": {},
         "provider": "banktransfer"
       }
 
@@ -2419,6 +2367,7 @@ Order refund endpoints
         "created": "2017-12-01T10:00:00Z",
         "execution_date": null,
         "comment": "Cancellation",
+        "details": {},
         "provider": "manual"
       }
 
@@ -2548,10 +2497,6 @@ Revoked ticket secrets
 
 With some non-default ticket secret generation methods, a list of revoked ticket secrets is required for proper validation.
 
-.. versionchanged:: 3.12
-
-   Added revocation lists.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/revokedsecrets/
 
    Returns a list of all revoked secrets within a given event.

doc/api/resources/organizers.rst

@@ -109,10 +109,6 @@ information about the properties.
 .. warning:: This API is intended for advanced users. Even though we take care to validate your input, you will be
              able to break your shops using this API by creating situations of conflicting settings. Please take care.
 
-.. versionchanged:: 3.14
-
-   Initial support for settings has been added to the API.
-
 .. http:get:: /api/v1/organizers/(organizer)/settings/
 
    Get current values of organizer settings.

doc/api/resources/questions.rst

@@ -76,26 +76,9 @@ dependency_value                      string                     An old version
                                                                  for one value. **Deprecated.**
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.5
-
-  The attribute ``help_text`` has been added.
-
-.. versionchanged:: 3.14
-
-  The attributes ``valid_*`` have been added.
-
-.. versionchanged:: 3.18
-
-  The attribute ``valid_file_portrait`` have been added.
-
 Endpoints
 ---------
 
-.. versionchanged:: 1.15
-
-   The questions endpoint has been extended by the filter queries ``ask_during_checkin``, ``requred``, and
-   ``identifier``.
-
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/questions/
 
    Returns a list of all questions within a given event.

doc/api/resources/quotas.rst

@@ -36,10 +36,6 @@ available_number                      integer                    Number of avail
                                                                  slightly out of date. ``null`` means unlimited.
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.10
-
-   The attribute ``release_after_exit`` has been added.
-
 .. versionchanged:: 4.1
 
     The ``with_availability`` query parameter has been added.

doc/api/resources/subevents.rst

@@ -59,29 +59,13 @@ seat_category_mapping                 object                     An object mappi
 last_modified                         datetime                   Last modification of this object
 ===================================== ========================== =======================================================
 
-.. versionchanged:: 3.3
+.. versionchanged:: 4.15
 
-   The attributes ``geo_lat`` and ``geo_lon`` have been added.
-
-.. versionchanged:: 3.10
-
-   The ``disabled`` attribute has been added to ``item_price_overrides`` and ``variation_price_overrides``.
-
-.. versionchanged:: 3.12
-
-   The ``last_modified`` attribute has been added.
-
-.. versionchanged:: 3.18
-
-   The ``available_from``/``available_until`` attributes have been added to ``item_price_overrides`` and ``variation_price_overrides``.
+    The ``search`` query parameter has been added to filter sub-events by their name or location in any language.
 
 Endpoints
 ---------
 
-.. versionchanged:: 3.3
-
-    The sub-events resource can now be filtered by meta data attributes.
-
 .. versionchanged:: 4.1
 
     The ``with_availability_for`` parameter has been added.
@@ -147,6 +131,7 @@ Endpoints
    :query is_future: If set to ``true`` (``false``), only events that happen currently or in the future are (not) returned.
    :query is_past: If set to ``true`` (``false``), only events that are over are (not) returned.
    :query ends_after: If set to a date and time, only events that happen during of after the given time are returned.
+   :query search: Only return events matching a given search query.
    :param organizer: The ``slug`` field of a valid organizer
    :param event: The ``slug`` field of the main event
    :query datetime modified_since: Only return objects that have changed since the given date. Be careful: This does not

doc/api/resources/vouchers.rst

@@ -19,6 +19,8 @@ max_usages                            integer                    The maximum num
                                                                  redeemed (default: 1).
 redeemed                              integer                    The number of times this voucher already has been
                                                                  redeemed.
+min_usages                            integer                    The minimum number of times this voucher must be
+                                                                 redeemed on first usage (default: 1).
 valid_until                           datetime                   The voucher expiration date (or ``null``).
 block_quota                           boolean                    If ``true``, quota is blocked for this voucher.
 allow_ignore_quota                    boolean                    If ``true``, this voucher can be redeemed even if a
@@ -48,10 +50,6 @@ show_hidden_items                     boolean                    Only if set to
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 3.4
-
-   The attribute ``seat`` has been added.
-
 Endpoints
 ---------
 

doc/api/resources/waitinglist.rst

@@ -30,12 +30,6 @@ subevent                              integer                    ID of the date
 ===================================== ========================== =======================================================
 
 
-.. versionchanged:: 1.15
-
-   The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added as well as a method to send out
-   vouchers.
-
-
 Endpoints
 ---------
 

doc/development/api/exporter.rst

@@ -60,7 +60,13 @@ The exporter class
    .. py:attribute:: BaseExporter.event
 
       The default constructor sets this property to the event we are currently
-      working for.
+      working for. This will be ``None`` if the exporter is run for multiple
+      events.
+
+   .. py:attribute:: BaseExporter.events
+
+      The default constructor sets this property to the list of events to work
+      on, regardless of whether the exporter is called for one or multiple events.
 
    .. autoattribute:: identifier
 
@@ -70,6 +76,10 @@ The exporter class
 
       This is an abstract attribute, you **must** override this!
 
+   .. autoattribute:: description
+
+   .. autoattribute:: category
+
    .. autoattribute:: export_form_fields
 
    .. automethod:: render

doc/development/api/payment.rst

@@ -126,6 +126,8 @@ The provider class
 
    .. automethod:: api_payment_details
 
+   .. automethod:: api_refund_details
+
    .. automethod:: matching_id
 
    .. automethod:: shred_payment_info
@@ -136,6 +138,10 @@ The provider class
 
    .. autoattribute:: is_meta
 
+   .. autoattribute:: execute_payment_needs_user
+
+   .. autoattribute:: multi_use_supported
+
    .. autoattribute:: test_mode_message
 
    .. autoattribute:: requires_invoice_immediately

doc/development/implementation/permissions.rst

@@ -184,11 +184,6 @@ Most of these methods work identically on :class:`pretix.base.models.TeamAPIToke
 Staff sessions
 --------------
 
-.. versionchanged:: 1.14
-
-   In 1.14, the ``User.is_superuser`` attribute has been deprecated and statically set to return ``False``. Staff
-   sessions have been newly introduced.
-
 System administrators of a pretix instance are identified by the ``is_staff`` attribute on the user model. By default,
 the regular permission rules apply for users with ``is_staff = True``. The only difference is that such users can
 temporarily turn on "staff mode" via a button in the user interface that grants them **all permissions** as long as

doc/plugins/digital.rst

@@ -91,8 +91,10 @@ Field                                 Type                       Description
 ===================================== ========================== =======================================================
 id                                    integer                    Internal content ID
 title                                 multi-lingual string       The content title (required)
+internal_name                         string                     An optional name that is only used in the backend
 content_type                          string                     The type of content, valid values are ``webinar``, ``video``, ``livestream``, ``link``, ``file``
 url                                   string                     The location of the digital content
+file                                  file                       A downloadable file. Either ``url`` or ``file`` must be ``null``.
 description                           multi-lingual string       A public description of the item. May contain Markdown
                                                                  syntax and is not required.
 available_from                        datetime                   The first date time at which this content will be shown
@@ -144,6 +146,7 @@ API Endpoints
             },
             "content_type": "link",
             "url": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
+            "file": null,
             "description": {
                 "en": "Watch our event live here on YouTube!"
             },
@@ -191,6 +194,7 @@ API Endpoints
         },
         "content_type": "link",
         "url": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
+        "file": null,
         "description": {
             "en": "Watch our event live here on YouTube!"
         },
@@ -229,6 +233,7 @@ API Endpoints
         },
         "content_type": "link",
         "url": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
+        "file": null,
         "description": {
             "en": "Watch our event live here on YouTube!"
         },
@@ -255,6 +260,7 @@ API Endpoints
         },
         "content_type": "link",
         "url": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
+        "file": null,
         "description": {
             "en": "Watch our event live here on YouTube!"
         },
@@ -309,6 +315,7 @@ API Endpoints
         },
         "content_type": "link",
         "url": "https://mywebsite.com",
+        "file": null,
         "description": {
             "en": "Watch our event live here on YouTube!"
         },

doc/plugins/ticketoutputpdf.rst

@@ -17,9 +17,13 @@ Field                                 Type                       Description
 id                                    integer                    Internal layout ID
 name                                  string                     Internal layout description
 default                               boolean                    ``true`` if this is the default layout
-layout                                object                     Layout specification for libpretixprint
+layout                                list                       Dynamic layout specification. Each list element
+                                                                 corresponds to one dynamic element of the layout.
+                                                                 The current version of the schema in use can be found
+                                                                 `here`_.
+                                                                 Submitting invalid content can lead to application errors.
 background                            URL                        Background PDF file
-item_assignments                      list of objects            Products this layout is assigned to
+item_assignments                      list of objects            Products this layout is assigned to (currently read-only)
 ├ sales_channel                       string                     Sales channel (defaults to ``web``).
 └ item                                integer                    Item ID
 ===================================== ========================== =======================================================
@@ -58,7 +62,7 @@ Endpoints
             "name": "Default layout",
             "default": true,
             "layout": {…},
-            "background": {},
+            "background": null,
             "item_assignments": []
           }
         ]
@@ -96,7 +100,7 @@ Endpoints
         "name": "Default layout",
         "default": true,
         "layout": {…},
-        "background": {},
+        "background": null,
         "item_assignments": []
       }
 
@@ -147,3 +151,122 @@ Endpoints
    :statuscode 200: no error
    :statuscode 401: Authentication failure
    :statuscode 403: The requested organizer does not exist **or** you have no permission to view it.
+
+.. http:post:: /api/v1/organizers/(organizer)/events/(event)/ticketlayouts/
+
+   Creates a new ticket layout
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      POST /api/v1/organizers/bigevents/events/sampleconf/ticketlayouts/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+
+      {
+        "name": "Default layout",
+        "default": true,
+        "layout": […],
+        "background": null,
+        "item_assignments": []
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 201 Created
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "name": "Default layout",
+        "default": true,
+        "layout": […],
+        "background": null,
+        "item_assignments": []
+      }
+
+   :param organizer: The ``slug`` field of the organizer of the event to create a layout for
+   :param event: The ``slug`` field of the event to create a layout for
+   :statuscode 201: no error
+   :statuscode 400: The layout could not be created due to invalid submitted data.
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to create this resource.
+
+.. http:patch:: /api/v1/organizers/(organizer)/events/(event)/ticketlayouts/(id)/
+
+   Update a layout. You can also use ``PUT`` instead of ``PATCH``. With ``PUT``, you have to provide all fields of
+   the resource, other fields will be reset to default. With ``PATCH``, you only need to provide the fields that you
+   want to change.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      PATCH /api/v1/organizers/bigevents/events/sampleconf/ticketlayouts/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+      Content-Type: application/json
+      Content-Length: 94
+
+      {
+        "name": "Default layout"
+      }
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "id": 1,
+        "name": "Default layout",
+        "default": true,
+        "layout": […],
+        "background": null,
+        "item_assignments": []
+      }
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the layout to modify
+   :statuscode 200: no error
+   :statuscode 400: The layout could not be modified due to invalid submitted data
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to change this resource.
+
+.. http:delete:: /api/v1/organizers/(organizer)/events/(event)/ticketlayouts/(id)/
+
+   Delete a layout.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      DELETE /api/v1/organizers/bigevents/events/sampleconf/ticketlayouts/1/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 204 No Content
+      Vary: Accept
+
+   :param organizer: The ``slug`` field of the organizer to modify
+   :param event: The ``slug`` field of the event to modify
+   :param id: The ``id`` field of the layout to delete
+   :statuscode 204: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to delete this resource.
+
+
+.. _here: https://github.com/pretix/pretix/blob/master/src/pretix/static/schema/pdf-layout.schema.json

doc/requirements.rtd.txt

@@ -0,0 +1,10 @@
+sphinx==2.3.*
+jinja2==3.0.*
+sphinx-rtd-theme
+sphinxcontrib-httpdomain
+sphinxcontrib-images
+sphinxcontrib-spelling==4.*
+sphinxemoji
+pygments-markdown-lexer
+# See https://github.com/rfk/pyenchant/pull/130
+git+https://github.com/raphaelm/pyenchant.git@patch-1#egg=pyenchant

doc/spelling_wordlist.txt

@@ -97,6 +97,7 @@ overpayment
 param
 passphrase
 percental
+personalization
 pluggable
 positionid
 pre

doc/user/events/widget.rst

@@ -447,8 +447,4 @@ Hosted or pretix Enterprise are active, you can pass the following fields:
     </script>
 
 
-.. versionchanged:: 3.6
-
-   Dynamically opening the widget has been added in pretix 3.6.
-
 .. _Let's Encrypt: https://letsencrypt.org/

readthedocs.yml

@@ -1,6 +0,0 @@
-
-build:
-  image: latest
-
-python:
-  version: 3.6

src/pretix/__init__.py

@@ -19,4 +19,4 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-__version__ = "4.13.0.dev0"
+__version__ = "4.16.1"

src/pretix/api/auth/devicesecurity.py

@@ -46,6 +46,7 @@ class PretixScanSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
         ('GET', 'api-v1:idempotency.query'),
+        ('GET', 'api-v1:device.info'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -80,6 +81,7 @@ class PretixScanNoSyncNoSearchSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
         ('GET', 'api-v1:idempotency.query'),
+        ('GET', 'api-v1:device.info'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -112,6 +114,7 @@ class PretixScanNoSyncSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
         ('GET', 'api-v1:idempotency.query'),
+        ('GET', 'api-v1:device.info'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -145,6 +148,7 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('GET', 'api-v1:version'),
         ('GET', 'api-v1:device.eventselection'),
         ('GET', 'api-v1:idempotency.query'),
+        ('GET', 'api-v1:device.info'),
         ('POST', 'api-v1:device.update'),
         ('POST', 'api-v1:device.revoke'),
         ('POST', 'api-v1:device.roll'),
@@ -192,6 +196,7 @@ class PretixPosSecurityProfile(AllowListSecurityProfile):
         ('POST', 'plugins:pretix_posbackend:posdebuglogentry-bulk-create'),
         ('GET', 'plugins:pretix_posbackend:poscashier-list'),
         ('POST', 'plugins:pretix_posbackend:stripeterminal.token'),
+        ('POST', 'plugins:pretix_posbackend:stripeterminal.paymentintent'),
         ('PUT', 'plugins:pretix_posbackend:file.upload'),
         ('GET', 'api-v1:revokedsecrets-list'),
         ('GET', 'api-v1:event.settings'),

src/pretix/api/exception.py

@@ -19,11 +19,17 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
+import logging
+
+import ujson
+from rest_framework import exceptions
 from rest_framework.response import Response
 from rest_framework.views import exception_handler, status
 
 from pretix.base.services.locking import LockTimeoutException
 
+logger = logging.getLogger(__name__)
+
 
 def custom_exception_handler(exc, context):
     response = exception_handler(exc, context)
@@ -37,4 +43,7 @@ def custom_exception_handler(exc, context):
             }
         )
 
+    if isinstance(exc, exceptions.APIException):
+        logger.info(f'API Exception [{exc.status_code}]: {ujson.dumps(exc.detail)}')
+
     return response

src/pretix/api/middleware.py

@@ -32,6 +32,7 @@ from rest_framework import status
 
 from pretix.api.models import ApiCall
 from pretix.base.models import Organizer
+from pretix.helpers import OF_SELF
 
 
 class IdempotencyMiddleware:
@@ -56,7 +57,7 @@ class IdempotencyMiddleware:
         idempotency_key = request.headers.get('X-Idempotency-Key', '')
 
         with transaction.atomic():
-            call, created = ApiCall.objects.select_for_update().get_or_create(
+            call, created = ApiCall.objects.select_for_update(of=OF_SELF).get_or_create(
                 auth_hash=auth_hash,
                 idempotency_key=idempotency_key,
                 defaults={

src/pretix/api/migrations/0009_auto_20221217_1847.py

@@ -0,0 +1,77 @@
+# Generated by Django 3.2.16 on 2022-12-17 18:47
+
+import uuid
+
+import django.db.models.deletion
+import oauth2_provider.generators
+import oauth2_provider.models
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0226_itemvariationmetavalue'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('pretixapi', '0008_webhookcallretry'),
+    ]
+    run_before = [
+        ('oauth2_provider', '0002_auto_20190406_1805'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='oauthapplication',
+            name='algorithm',
+            field=models.CharField(default='', max_length=5),
+        ),
+        migrations.AddField(
+            model_name='oauthgrant',
+            name='claims',
+            field=models.TextField(default=''),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='oauthgrant',
+            name='code_challenge',
+            field=models.CharField(default='', max_length=128),
+        ),
+        migrations.AddField(
+            model_name='oauthgrant',
+            name='code_challenge_method',
+            field=models.CharField(default='', max_length=10),
+        ),
+        migrations.AddField(
+            model_name='oauthgrant',
+            name='nonce',
+            field=models.CharField(default='', max_length=255),
+        ),
+        migrations.AlterField(
+            model_name='oauthapplication',
+            name='client_secret',
+            field=oauth2_provider.models.ClientSecretField(db_index=True, default=oauth2_provider.generators.generate_client_secret, max_length=255),
+        ),
+        migrations.CreateModel(
+            name='OAuthIDToken',
+            fields=[
+                ('id', models.BigAutoField(primary_key=True, serialize=False)),
+                ('jti', models.UUIDField(default=uuid.uuid4, unique=True)),
+                ('expires', models.DateTimeField()),
+                ('scope', models.TextField()),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('updated', models.DateTimeField(auto_now=True)),
+                ('application', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.OAUTH2_PROVIDER_APPLICATION_MODEL)),
+                ('organizers', models.ManyToManyField(to='pretixbase.Organizer')),
+                ('user', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='pretixapi_oauthidtoken', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.AddField(
+            model_name='oauthaccesstoken',
+            name='id_token',
+            field=models.OneToOneField(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='access_token', to='pretixapi.oauthidtoken'),
+        ),
+    ]

src/pretix/api/models.py

@@ -29,8 +29,8 @@ from oauth2_provider.generators import (
     generate_client_id, generate_client_secret,
 )
 from oauth2_provider.models import (
-    AbstractAccessToken, AbstractApplication, AbstractGrant,
-    AbstractRefreshToken,
+    AbstractAccessToken, AbstractApplication, AbstractGrant, AbstractIDToken,
+    AbstractRefreshToken, ClientSecretField,
 )
 from oauth2_provider.validators import URIValidator
 
@@ -46,7 +46,7 @@ class OAuthApplication(AbstractApplication):
         verbose_name=_("Client ID"),
         max_length=100, unique=True, default=generate_client_id, db_index=True
     )
-    client_secret = models.CharField(
+    client_secret = ClientSecretField(
         verbose_name=_("Client secret"),
         max_length=255, blank=False, default=generate_client_secret, db_index=True
     )
@@ -67,12 +67,26 @@ class OAuthGrant(AbstractGrant):
     redirect_uri = models.CharField(max_length=2500)  # Only 255 in AbstractGrant, which caused problems
 
 
+class OAuthIDToken(AbstractIDToken):
+    application = models.ForeignKey(
+        OAuthApplication, on_delete=models.CASCADE,
+    )
+    organizers = models.ManyToManyField('pretixbase.Organizer')
+
+
 class OAuthAccessToken(AbstractAccessToken):
     source_refresh_token = models.OneToOneField(
         # unique=True implied by the OneToOneField
         'OAuthRefreshToken', on_delete=models.SET_NULL, blank=True, null=True,
         related_name="refreshed_access_token"
     )
+    id_token = models.OneToOneField(
+        OAuthIDToken,
+        on_delete=models.CASCADE,
+        blank=True,
+        null=True,
+        related_name="access_token",
+    )
     application = models.ForeignKey(
         OAuthApplication, on_delete=models.CASCADE, blank=True, null=True,
     )

src/pretix/api/serializers/cart.py

@@ -23,8 +23,7 @@ import os
 from datetime import timedelta
 
 from django.core.files import File
-from django.db.models import Q
-from django.utils.crypto import get_random_string
+from django.db.models import prefetch_related_objects
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy
 from rest_framework import serializers
@@ -34,7 +33,7 @@ from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.order import (
     AnswerCreateSerializer, AnswerSerializer, InlineSeatSerializer,
 )
-from pretix.base.models import Quota, Seat, Voucher
+from pretix.base.models import Seat, Voucher
 from pretix.base.models.orders import CartPosition
 
 
@@ -52,148 +51,18 @@ class CartPositionSerializer(I18nAwareModelSerializer):
         model = CartPosition
         fields = ('id', 'cart_id', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts',
                   'attendee_email', 'voucher', 'addon_to', 'subevent', 'datetime', 'expires', 'includes_tax',
-                  'answers', 'seat')
+                  'answers', 'seat', 'is_bundled')
 
 
-class CartPositionCreateSerializer(I18nAwareModelSerializer):
+class BaseCartPositionCreateSerializer(I18nAwareModelSerializer):
     answers = AnswerCreateSerializer(many=True, required=False)
-    expires = serializers.DateTimeField(required=False)
     attendee_name = serializers.CharField(required=False, allow_null=True)
-    seat = serializers.CharField(required=False, allow_null=True)
-    sales_channel = serializers.CharField(required=False, default='sales_channel')
     includes_tax = serializers.BooleanField(required=False, allow_null=True)
-    voucher = serializers.CharField(required=False, allow_null=True)
 
     class Meta:
         model = CartPosition
-        fields = ('cart_id', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
-                  'subevent', 'expires', 'includes_tax', 'answers', 'seat', 'sales_channel', 'voucher')
-
-    def create(self, validated_data):
-        answers_data = validated_data.pop('answers')
-        if not validated_data.get('cart_id'):
-            cid = "{}@api".format(get_random_string(48))
-            while CartPosition.objects.filter(cart_id=cid).exists():
-                cid = "{}@api".format(get_random_string(48))
-            validated_data['cart_id'] = cid
-
-        if not validated_data.get('expires'):
-            validated_data['expires'] = now() + timedelta(
-                minutes=self.context['event'].settings.get('reservation_time', as_type=int)
-            )
-
-        new_quotas = (validated_data.get('variation').quotas.filter(subevent=validated_data.get('subevent'))
-                      if validated_data.get('variation')
-                      else validated_data.get('item').quotas.filter(subevent=validated_data.get('subevent')))
-        if len(new_quotas) == 0:
-            raise ValidationError(
-                gettext_lazy('The product "{}" is not assigned to a quota.').format(
-                    str(validated_data.get('item'))
-                )
-            )
-        for quota in new_quotas:
-            avail = quota.availability(_cache=self.context['quota_cache'])
-            if avail[0] != Quota.AVAILABILITY_OK or (avail[1] is not None and avail[1] < 1):
-                raise ValidationError(
-                    gettext_lazy('There is not enough quota available on quota "{}" to perform '
-                                 'the operation.').format(
-                        quota.name
-                    )
-                )
-
-        for quota in new_quotas:
-            oldsize = self.context['quota_cache'][quota.pk][1]
-            newsize = oldsize - 1 if oldsize is not None else None
-            self.context['quota_cache'][quota.pk] = (
-                Quota.AVAILABILITY_OK if newsize is None or newsize > 0 else Quota.AVAILABILITY_GONE,
-                newsize
-            )
-
-        attendee_name = validated_data.pop('attendee_name', '')
-        if attendee_name and not validated_data.get('attendee_name_parts'):
-            validated_data['attendee_name_parts'] = {
-                '_legacy': attendee_name
-            }
-
-        seated = validated_data.get('item').seat_category_mappings.filter(subevent=validated_data.get('subevent')).exists()
-        if validated_data.get('seat'):
-            if not seated:
-                raise ValidationError('The specified product does not allow to choose a seat.')
-            try:
-                seat = self.context['event'].seats.get(seat_guid=validated_data['seat'], subevent=validated_data.get('subevent'))
-            except Seat.DoesNotExist:
-                raise ValidationError('The specified seat does not exist.')
-            except Seat.MultipleObjectsReturned:
-                raise ValidationError('The specified seat ID is not unique.')
-            else:
-                validated_data['seat'] = seat
-        elif seated:
-            raise ValidationError('The specified product requires to choose a seat.')
-
-        if validated_data.get('voucher'):
-            try:
-                voucher = self.context['event'].vouchers.get(code__iexact=validated_data.get('voucher'))
-            except Voucher.DoesNotExist:
-                raise ValidationError('The specified voucher does not exist.')
-
-            if voucher and not voucher.applies_to(validated_data.get('item'), validated_data.get('variation')):
-                raise ValidationError('The specified voucher is not valid for the given item and variation.')
-
-            if voucher and voucher.seat and voucher.seat != validated_data.get('seat'):
-                raise ValidationError('The specified voucher is not valid for this seat.')
-
-            if voucher and voucher.subevent_id and (not validated_data.get('subevent') or voucher.subevent_id != validated_data['subevent'].pk):
-                raise ValidationError('The specified voucher is not valid for this subevent.')
-
-            if voucher.valid_until is not None and voucher.valid_until < now():
-                raise ValidationError('The specified voucher is expired.')
-
-            redeemed_in_carts = CartPosition.objects.filter(
-                Q(voucher=voucher) & Q(event=self.context['event']) & Q(expires__gte=now())
-            )
-            cart_count = redeemed_in_carts.count()
-            v_avail = voucher.max_usages - voucher.redeemed - cart_count
-            if v_avail < 1:
-                raise ValidationError('The specified voucher has already been used the maximum number of times.')
-
-            validated_data['voucher'] = voucher
-
-        if validated_data.get('seat'):
-            if not validated_data['seat'].is_available(
-                sales_channel=validated_data.get('sales_channel', 'web'),
-                distance_ignore_cart_id=validated_data['cart_id'],
-                ignore_voucher_id=validated_data['voucher'].pk if validated_data.get('voucher') else None,
-            ):
-                raise ValidationError(
-                    gettext_lazy('The selected seat "{seat}" is not available.').format(seat=validated_data['seat'].name))
-
-        validated_data.pop('sales_channel')
-        # todo: does this make sense?
-        validated_data['custom_price_input'] = validated_data['price']
-        # todo: listed price, etc?
-        # currently does not matter because there is no way to transform an API cart position into an order that keeps
-        # prices, cart positions are just quota/voucher placeholders
-        validated_data['custom_price_input_is_net'] = not validated_data.pop('includes_tax', True)
-        cp = CartPosition.objects.create(event=self.context['event'], **validated_data)
-
-        for answ_data in answers_data:
-            options = answ_data.pop('options')
-            if isinstance(answ_data['answer'], File):
-                an = answ_data.pop('answer')
-                answ = cp.answers.create(**answ_data, answer='')
-                answ.file.save(os.path.basename(an.name), an, save=False)
-                answ.answer = 'file://' + answ.file.name
-                answ.save()
-                an.close()
-            else:
-                answ = cp.answers.create(**answ_data)
-                answ.options.add(*options)
-        return cp
-
-    def validate_cart_id(self, cid):
-        if cid and not cid.endswith('@api'):
-            raise ValidationError('Cart ID should end in @api or be empty.')
-        return cid
+        fields = ('item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
+                  'subevent', 'includes_tax', 'answers')
 
     def validate_item(self, item):
         if item.event != self.context['event']:
@@ -240,4 +109,180 @@ class CartPositionCreateSerializer(I18nAwareModelSerializer):
             raise ValidationError(
                 {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
             )
+
+        if not data.get('expires'):
+            data['expires'] = now() + timedelta(
+                minutes=self.context['event'].settings.get('reservation_time', as_type=int)
+            )
+
+        quotas_for_item_cache = self.context.get('quotas_for_item_cache', {})
+        quotas_for_variation_cache = self.context.get('quotas_for_variation_cache', {})
+
+        seated = data.get('item').seat_category_mappings.filter(subevent=data.get('subevent')).exists()
+        if data.get('seat'):
+            if not seated:
+                raise ValidationError({'seat': ['The specified product does not allow to choose a seat.']})
+            try:
+                seat = self.context['event'].seats.get(seat_guid=data['seat'], subevent=data.get('subevent'))
+            except Seat.DoesNotExist:
+                raise ValidationError({'seat': ['The specified seat does not exist.']})
+            except Seat.MultipleObjectsReturned:
+                raise ValidationError({'seat': ['The specified seat ID is not unique.']})
+            else:
+                data['seat'] = seat
+        elif seated:
+            raise ValidationError({'seat': ['The specified product requires to choose a seat.']})
+
+        if data.get('voucher'):
+            try:
+                voucher = self.context['event'].vouchers.get(code__iexact=data['voucher'])
+            except Voucher.DoesNotExist:
+                raise ValidationError({'voucher': ['The specified voucher does not exist.']})
+
+            if voucher and not voucher.applies_to(data['item'], data.get('variation')):
+                raise ValidationError({'voucher': ['The specified voucher is not valid for the given item and variation.']})
+
+            if voucher and voucher.seat and voucher.seat != data.get('seat'):
+                raise ValidationError({'voucher': ['The specified voucher is not valid for this seat.']})
+
+            if voucher and voucher.subevent_id and (not data.get('subevent') or voucher.subevent_id != data['subevent'].pk):
+                raise ValidationError({'voucher': ['The specified voucher is not valid for this subevent.']})
+
+            if voucher.valid_until is not None and voucher.valid_until < now():
+                raise ValidationError({'voucher': ['The specified voucher is expired.']})
+
+            data['voucher'] = voucher
+
+        if not data.get('voucher') or (not data['voucher'].allow_ignore_quota and not data['voucher'].block_quota):
+            if data.get('variation'):
+                if data['variation'].pk not in quotas_for_variation_cache:
+                    quotas_for_variation_cache[data['variation'].pk] = data['variation'].quotas.filter(subevent=data.get('subevent'))
+                data['_quotas'] = quotas_for_variation_cache[data['variation'].pk]
+            else:
+                if data['item'].pk not in quotas_for_item_cache:
+                    quotas_for_item_cache[data['item'].pk] = data['item'].quotas.filter(subevent=data.get('subevent'))
+                data['_quotas'] = quotas_for_item_cache[data['item'].pk]
+
+            if len(data['_quotas']) == 0:
+                raise ValidationError(
+                    gettext_lazy('The product "{}" is not assigned to a quota.').format(
+                        str(data.get('item'))
+                    )
+                )
+        else:
+            data['_quotas'] = []
+
+        return data
+
+    def create(self, validated_data):
+        validated_data.pop('_quotas')
+        answers_data = validated_data.pop('answers')
+
+        attendee_name = validated_data.pop('attendee_name', '')
+        if attendee_name and not validated_data.get('attendee_name_parts'):
+            validated_data['attendee_name_parts'] = {
+                '_legacy': attendee_name
+            }
+
+        # todo: does this make sense?
+        validated_data['custom_price_input'] = validated_data['price']
+        # todo: listed price, etc?
+        # currently does not matter because there is no way to transform an API cart position into an order that keeps
+        # prices, cart positions are just quota/voucher placeholders
+        validated_data['custom_price_input_is_net'] = not validated_data.pop('includes_tax', True)
+        cp = CartPosition.objects.create(event=self.context['event'], **validated_data)
+
+        for answ_data in answers_data:
+            options = answ_data.pop('options')
+            if isinstance(answ_data['answer'], File):
+                an = answ_data.pop('answer')
+                answ = cp.answers.create(**answ_data, answer='')
+                answ.file.save(os.path.basename(an.name), an, save=False)
+                answ.answer = 'file://' + answ.file.name
+                answ.save()
+                an.close()
+            else:
+                answ = cp.answers.create(**answ_data)
+                answ.options.add(*options)
+        return cp
+
+
+class CartPositionCreateSerializer(BaseCartPositionCreateSerializer):
+    expires = serializers.DateTimeField(required=False)
+    addons = BaseCartPositionCreateSerializer(many=True, required=False)
+    bundled = BaseCartPositionCreateSerializer(many=True, required=False)
+    seat = serializers.CharField(required=False, allow_null=True)
+    sales_channel = serializers.CharField(required=False, default='sales_channel')
+    voucher = serializers.CharField(required=False, allow_null=True)
+
+    class Meta:
+        model = CartPosition
+        fields = BaseCartPositionCreateSerializer.Meta.fields + (
+            'cart_id', 'expires', 'addons', 'bundled', 'seat', 'sales_channel', 'voucher'
+        )
+
+    def validate_cart_id(self, cid):
+        if cid and not cid.endswith('@api'):
+            raise ValidationError('Cart ID should end in @api or be empty.')
+        return cid
+
+    def create(self, validated_data):
+        validated_data.pop('sales_channel')
+        addons_data = validated_data.pop('addons', None)
+        bundled_data = validated_data.pop('bundled', None)
+
+        cp = super().create(validated_data)
+
+        if addons_data:
+            for addon_data in addons_data:
+                addon_data['addon_to'] = cp
+                addon_data['is_bundled'] = False
+                addon_data['cart_id'] = cp.cart_id
+                super().create(addon_data)
+
+        if bundled_data:
+            for bundle_data in bundled_data:
+                bundle_data['addon_to'] = cp
+                bundle_data['is_bundled'] = True
+                bundle_data['cart_id'] = cp.cart_id
+                super().create(bundle_data)
+
+        return cp
+
+    def validate(self, data):
+        data = super().validate(data)
+
+        # This is currently only a very basic validation of add-ons and bundled products, we don't validate their number
+        # or price. We can always go stricter, as the endpoint is documented as experimental.
+        # However, this serializer should always be *at least* as strict as the order creation serializer.
+
+        if data.get('item') and data.get('addons'):
+            prefetch_related_objects([data['item']], 'addons')
+            for sub_data in data['addons']:
+                if not any(a.addon_category_id == sub_data['item'].category_id for a in data['item'].addons.all()):
+                    raise ValidationError({
+                        'addons': [
+                            'The product "{prod}" can not be used as an add-on product for "{main}".'.format(
+                                prod=str(sub_data['item']),
+                                main=str(data['item']),
+                            )
+                        ]
+                    })
+
+        if data.get('item') and data.get('bundled'):
+            prefetch_related_objects([data['item']], 'bundles')
+            for sub_data in data['bundled']:
+                if not any(
+                    a.bundled_item_id == sub_data['item'].pk and
+                    a.bundled_variation_id == (sub_data['variation'].pk if sub_data.get('variation') else None)
+                    for a in data['item'].bundles.all()
+                ):
+                    raise ValidationError({
+                        'bundled': [
+                            'The product "{prod}" can not be used as an bundled product for "{main}".'.format(
+                                prod=str(sub_data['item']),
+                                main=str(data['item']),
+                            )
+                        ]
+                    })
         return data

src/pretix/api/serializers/event.py

@@ -411,7 +411,8 @@ class CloneEventSerializer(EventSerializer):
         has_subevents = validated_data.pop('has_subevents', None)
         tz = validated_data.pop('timezone', None)
         sales_channels = validated_data.pop('sales_channels', None)
-        new_event = super().create(validated_data)
+        date_admission = validated_data.pop('date_admission', None)
+        new_event = super().create({**validated_data, 'plugins': None})
 
         event = Event.objects.filter(slug=self.context['event'], organizer=self.context['organizer'].pk).first()
         new_event.copy_data_from(event)
@@ -426,6 +427,10 @@ class CloneEventSerializer(EventSerializer):
             new_event.sales_channels = sales_channels
         if has_subevents is not None:
             new_event.has_subevents = has_subevents
+        if has_subevents is not None:
+            new_event.has_subevents = has_subevents
+        if date_admission is not None:
+            new_event.date_admission = date_admission
         new_event.save()
         if tz:
             new_event.settings.timezone = tz
@@ -755,6 +760,9 @@ class EventSettingsSerializer(SettingsSerializer):
         'invoice_logo_image',
         'cancel_allow_user',
         'cancel_allow_user_until',
+        'cancel_allow_user_unpaid_keep',
+        'cancel_allow_user_unpaid_keep_fees',
+        'cancel_allow_user_unpaid_keep_percentage',
         'cancel_allow_user_paid',
         'cancel_allow_user_paid_until',
         'cancel_allow_user_paid_keep',

src/pretix/api/serializers/exporters.py

@@ -22,6 +22,10 @@
 from django import forms
 from django.http import QueryDict
 from rest_framework import serializers
+from rest_framework.exceptions import ValidationError
+
+from pretix.base.exporter import OrganizerLevelExportMixin
+from pretix.base.timeframes import DateFrameField, SerializerDateFrameField
 
 
 class FormFieldWrapperField(serializers.Field):
@@ -49,7 +53,6 @@ simple_mappings = (
     (forms.EmailField, serializers.EmailField, ()),
     (forms.UUIDField, serializers.UUIDField, ()),
     (forms.URLField, serializers.URLField, ()),
-    (forms.NullBooleanField, serializers.NullBooleanField, ()),
     (forms.BooleanField, serializers.BooleanField, ()),
 )
 
@@ -87,7 +90,7 @@ class JobRunSerializer(serializers.Serializer):
         ex = kwargs.pop('exporter')
         events = kwargs.pop('events', None)
         super().__init__(*args, **kwargs)
-        if events is not None:
+        if events is not None and not isinstance(ex, OrganizerLevelExportMixin):
             self.fields["events"] = serializers.SlugRelatedField(
                 queryset=events,
                 required=True,
@@ -106,6 +109,12 @@ class JobRunSerializer(serializers.Serializer):
                     )
                     break
 
+            if isinstance(v, forms.NullBooleanField):
+                self.fields[k] = serializers.BooleanField(
+                    required=v.required,
+                    allow_null=True,
+                    validators=v.validators,
+                )
             if isinstance(v, forms.ModelMultipleChoiceField):
                 self.fields[k] = PrimaryKeyRelatedField(
                     queryset=v.queryset,
@@ -135,6 +144,12 @@ class JobRunSerializer(serializers.Serializer):
                     allow_null=not v.required,
                     validators=v.validators,
                 )
+            elif isinstance(v, DateFrameField):
+                self.fields[k] = SerializerDateFrameField(
+                    required=v.required,
+                    allow_null=not v.required,
+                    validators=v.validators,
+                )
             else:
                 self.fields[k] = FormFieldWrapperField(form_field=v, required=v.required, allow_null=not v.required)
 
@@ -144,5 +159,40 @@ class JobRunSerializer(serializers.Serializer):
         for k, v in self.fields.items():
             if isinstance(v, serializers.ManyRelatedField) and k not in data:
                 data[k] = []
+
+        for fk in self.fields.keys():
+            # Backwards compatibility for exports that used to take e.g. (date_from, date_to) or (event_date_from, event_date_to)
+            # and now only take date_range.
+            if fk.endswith("_range") and isinstance(self.fields[fk], SerializerDateFrameField) and fk not in data:
+                if fk.replace("_range", "_from") in data:
+                    d_from = data.pop(fk.replace("_range", "_from"))
+                    if d_from:
+                        d_from = serializers.DateField().to_internal_value(d_from)
+                else:
+                    d_from = None
+                if fk.replace("_range", "_to") in data:
+                    d_to = data.pop(fk.replace("_range", "_to"))
+                    if d_to:
+                        d_to = serializers.DateField().to_internal_value(d_to)
+                else:
+                    d_to = None
+                data[fk] = f'{d_from.isoformat() if d_from else ""}/{d_to.isoformat() if d_to else ""}'
+
         data = super().to_internal_value(data)
         return data
+
+    def is_valid(self, raise_exception=False):
+        super().is_valid(raise_exception=raise_exception)
+
+        fields_keys = set(self.fields.keys())
+        input_keys = set(self.initial_data.keys())
+
+        additional_fields = input_keys - fields_keys
+
+        if bool(additional_fields):
+            self._errors['fields'] = ['Additional fields not allowed: {}.'.format(list(additional_fields))]
+
+        if self._errors and raise_exception:
+            raise ValidationError(self.errors)
+
+        return not bool(self._errors)

src/pretix/api/serializers/item.py

@@ -47,13 +47,14 @@ 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,
-    Question, QuestionOption, Quota,
+    ItemVariationMetaValue, Question, QuestionOption, Quota,
 )
 
 
 class InlineItemVariationSerializer(I18nAwareModelSerializer):
     price = serializers.DecimalField(read_only=True, decimal_places=2, max_digits=10,
                                      coerce_to_string=True)
+    meta_data = MetaDataField(required=False, source='*')
 
     class Meta:
         model = ItemVariation
@@ -61,16 +62,23 @@ class InlineItemVariationSerializer(I18nAwareModelSerializer):
                   'position', 'default_price', 'price', 'original_price', 'require_approval',
                   'require_membership', 'require_membership_types',
                   'require_membership_hidden', 'available_from', 'available_until',
-                  'sales_channels', 'hide_without_voucher',)
+                  'sales_channels', 'hide_without_voucher', 'meta_data')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['require_membership_types'].queryset = lazy(lambda: self.context['event'].organizer.membership_types.all(), QuerySet)
 
+    def validate_meta_data(self, value):
+        for key in value['meta_data'].keys():
+            if key not in self.parent.parent.item_meta_properties:
+                raise ValidationError(_('Item meta data property \'{name}\' does not exist.').format(name=key))
+        return value
+
 
 class ItemVariationSerializer(I18nAwareModelSerializer):
     price = serializers.DecimalField(read_only=True, decimal_places=2, max_digits=10,
                                      coerce_to_string=True)
+    meta_data = MetaDataField(required=False, source='*')
 
     class Meta:
         model = ItemVariation
@@ -78,12 +86,67 @@ class ItemVariationSerializer(I18nAwareModelSerializer):
                   'position', 'default_price', 'price', 'original_price', 'require_approval',
                   'require_membership', 'require_membership_types',
                   'require_membership_hidden', 'available_from', 'available_until',
-                  'sales_channels', 'hide_without_voucher',)
+                  'sales_channels', 'hide_without_voucher', 'meta_data')
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['require_membership_types'].queryset = self.context['event'].organizer.membership_types.all()
 
+    @transaction.atomic
+    def create(self, validated_data):
+        meta_data = validated_data.pop('meta_data', None)
+        require_membership_types = validated_data.pop('require_membership_types', [])
+        variation = ItemVariation.objects.create(**validated_data)
+
+        if require_membership_types:
+            variation.require_membership_types.add(*require_membership_types)
+
+        # Meta data
+        if meta_data is not None:
+            for key, value in meta_data.items():
+                ItemVariationMetaValue.objects.create(
+                    property=self.item_meta_properties.get(key),
+                    value=value,
+                    variation=variation
+                )
+        return variation
+
+    @cached_property
+    def item_meta_properties(self):
+        return {
+            p.name: p for p in self.context['request'].event.item_meta_properties.all()
+        }
+
+    def validate_meta_data(self, value):
+        for key in value['meta_data'].keys():
+            if key not in self.item_meta_properties:
+                raise ValidationError(_('Item meta data property \'{name}\' does not exist.').format(name=key))
+        return value
+
+    def update(self, instance, validated_data):
+        meta_data = validated_data.pop('meta_data', None)
+        variation = super().update(instance, validated_data)
+
+        # Meta data
+        if meta_data is not None:
+            current = {mv.property: mv for mv in variation.meta_values.select_related('property')}
+            for key, value in meta_data.items():
+                prop = self.item_meta_properties.get(key)
+                if prop in current:
+                    current[prop].value = value
+                    current[prop].save()
+                else:
+                    variation.meta_values.create(
+                        property=self.item_meta_properties.get(key),
+                        value=value
+                    )
+
+            for prop, current_object in current.items():
+                if prop.name not in meta_data:
+                    current_object.delete()
+
+        return variation
+
 
 class InlineItemBundleSerializer(serializers.ModelSerializer):
     class Meta:
@@ -171,7 +234,7 @@ class ItemSerializer(I18nAwareModelSerializer):
     class Meta:
         model = Item
         fields = ('id', 'category', 'name', 'internal_name', 'active', 'sales_channels', 'description',
-                  'default_price', 'free_price', 'tax_rate', 'tax_rule', 'admission',
+                  'default_price', 'free_price', 'tax_rate', 'tax_rule', 'admission', 'personalized',
                   'position', 'picture', 'available_from', 'available_until',
                   'require_voucher', 'hide_without_voucher', 'allow_cancel', 'require_bundling',
                   'min_per_order', 'max_per_order', 'checkin_attention', 'has_variations', 'variations',
@@ -184,6 +247,8 @@ class ItemSerializer(I18nAwareModelSerializer):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
+        self.fields['default_price'].allow_null = False
+        self.fields['default_price'].required = True
         if not self.read_only:
             self.fields['require_membership_types'].queryset = self.context['event'].organizer.membership_types.all()
             self.fields['grant_membership_type'].queryset = self.context['event'].organizer.membership_types.all()
@@ -197,6 +262,15 @@ class ItemSerializer(I18nAwareModelSerializer):
         Item.clean_per_order(data.get('min_per_order'), data.get('max_per_order'))
         Item.clean_available(data.get('available_from'), data.get('available_until'))
 
+        if data.get('personalized') and not data.get('admission'):
+            raise ValidationError(_('Only admission products can currently be personalized.'))
+
+        if data.get('admission') and 'personalized' not in data and not self.instance:
+            # Backwards compatibility
+            data['personalized'] = True
+        elif 'admission' in data and not data['admission']:
+            data['personalized'] = False
+
         if data.get('issue_giftcard'):
             if data.get('tax_rule') and data.get('tax_rule').rate > 0:
                 raise ValidationError(
@@ -261,9 +335,19 @@ class ItemSerializer(I18nAwareModelSerializer):
 
         for variation_data in variations_data:
             require_membership_types = variation_data.pop('require_membership_types', [])
+            var_meta_data = variation_data.pop('meta_data', {})
             v = ItemVariation.objects.create(item=item, **variation_data)
             if require_membership_types:
                 v.require_membership_types.add(*require_membership_types)
+
+            if var_meta_data is not None:
+                for key, value in var_meta_data.items():
+                    ItemVariationMetaValue.objects.create(
+                        property=self.item_meta_properties.get(key),
+                        value=value,
+                        variation=v
+                    )
+
         for addon_data in addons_data:
             ItemAddOn.objects.create(base_item=item, **addon_data)
         for bundle_data in bundles_data:

src/pretix/api/serializers/order.py

@@ -29,6 +29,7 @@ import pycountry
 from django.conf import settings
 from django.core.files import File
 from django.db.models import F, Q
+from django.utils.encoding import force_str
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy
 from django_countries.fields import Country
@@ -61,14 +62,25 @@ from pretix.base.services.pricing import (
 )
 from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
 from pretix.base.signals import register_ticket_outputs
+from pretix.helpers.countries import CachedCountries
 from pretix.multidomain.urlreverse import build_absolute_uri
 
 logger = logging.getLogger(__name__)
 
 
 class CompatibleCountryField(serializers.Field):
+    countries = CachedCountries()
+    default_error_messages = {
+        'invalid_choice': gettext_lazy('"{input}" is not a valid choice.')
+    }
+
     def to_internal_value(self, data):
-        return {self.field_name: Country(data)}
+        country = self.countries.alpha2(data)
+        if data and not country:
+            country = self.countries.by_name(force_str(data))
+            if not country:
+                self.fail("invalid_choice", input=data)
+        return {self.field_name: Country(country)}
 
     def to_representation(self, instance: InvoiceAddress):
         if instance.country:
@@ -106,6 +118,10 @@ class InvoiceAddressSerializer(I18nAwareModelSerializer):
             raise ValidationError(
                 {'name': ['Do not specify name if you specified name_parts.']}
             )
+
+        if data.get('name_parts') and not isinstance(data.get('name_parts'), dict):
+            raise ValidationError({'name_parts': ['Invalid data type']})
+
         if data.get('name_parts') and '_scheme' not in data.get('name_parts'):
             data['name_parts']['_scheme'] = self.context['request'].event.settings.name_scheme
 
@@ -359,10 +375,19 @@ class PdfDataSerializer(serializers.Field):
             for k, v in ev._cached_meta_data.items():
                 res['meta:' + k] = v
 
-            if not hasattr(instance.item, '_cached_meta_data'):
-                instance.item._cached_meta_data = instance.item.meta_data
-            for k, v in instance.item._cached_meta_data.items():
-                res['itemmeta:' + k] = v
+            if instance.variation_id:
+                print(instance, instance.variation, instance.variation_id, instance.item)
+                if not hasattr(instance.variation, '_cached_meta_data'):
+                    instance.variation.item = instance.item  # saves some database lookups
+                    instance.variation._cached_meta_data = instance.variation.meta_data
+                print(instance.variation._cached_meta_data.items())
+                for k, v in instance.variation._cached_meta_data.items():
+                    res['itemmeta:' + k] = v
+            else:
+                if not hasattr(instance.item, '_cached_meta_data'):
+                    instance.item._cached_meta_data = instance.item.meta_data
+                for k, v in instance.item._cached_meta_data.items():
+                    res['itemmeta:' + k] = v
 
             res['images'] = {}
 
@@ -410,13 +435,13 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
     class Meta:
         model = OrderPosition
         fields = ('id', 'order', 'positionid', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts',
-                  'company', 'street', 'zipcode', 'city', 'country', 'state',
+                  'company', 'street', 'zipcode', 'city', 'country', 'state', 'discount',
                   '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'
+            'seat', 'canceled', 'discount',
         )
 
     def __init__(self, *args, **kwargs):
@@ -553,12 +578,22 @@ class OrderPaymentSerializer(I18nAwareModelSerializer):
                   'details')
 
 
+class RefundDetailsField(serializers.Field):
+    def to_representation(self, value: OrderRefund):
+        pp = value.payment_provider
+        if not pp:
+            return {}
+        return pp.api_refund_details(value)
+
+
 class OrderRefundSerializer(I18nAwareModelSerializer):
     payment = SlugRelatedField(slug_field='local_id', read_only=True)
+    details = RefundDetailsField(source='*', allow_null=True, read_only=True)
 
     class Meta:
         model = OrderRefund
-        fields = ('local_id', 'state', 'source', 'amount', 'payment', 'created', 'execution_date', 'comment', 'provider')
+        fields = ('local_id', 'state', 'source', 'amount', 'payment', 'created', 'execution_date', 'comment', 'provider',
+                  'details')
 
 
 class OrderURLField(serializers.URLField):
@@ -600,6 +635,32 @@ class OrderSerializer(I18nAwareModelSerializer):
         if not self.context['pdf_data']:
             self.fields['positions'].child.fields.pop('pdf_data', None)
 
+        includes = set(self.context['include'])
+        if includes:
+            for fname, field in list(self.fields.items()):
+                if fname in includes:
+                    continue
+                elif hasattr(field, 'child'):  # Nested list serializers
+                    found_any = False
+                    for childfname, childfield in list(field.child.fields.items()):
+                        if f'{fname}.{childfname}' not in includes:
+                            field.child.fields.pop(childfname)
+                        else:
+                            found_any = True
+                    if not found_any:
+                        self.fields.pop(fname)
+                elif isinstance(field, serializers.Serializer):  # Nested serializers
+                    found_any = False
+                    for childfname, childfield in list(field.fields.items()):
+                        if f'{fname}.{childfname}' not in includes:
+                            field.fields.pop(childfname)
+                        else:
+                            found_any = True
+                    if not found_any:
+                        self.fields.pop(fname)
+                else:
+                    self.fields.pop(fname)
+
         for exclude_field in self.context['exclude']:
             p = exclude_field.split('.')
             if p[0] in self.fields:
@@ -721,7 +782,7 @@ class OrderPositionCreateSerializer(I18nAwareModelSerializer):
     class Meta:
         model = OrderPosition
         fields = ('positionid', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts', 'attendee_email',
-                  'company', 'street', 'zipcode', 'city', 'country', 'state',
+                  'company', 'street', 'zipcode', 'city', 'country', 'state', 'is_bundled',
                   'secret', 'addon_to', 'subevent', 'answers', 'seat', 'voucher')
 
     def __init__(self, *args, **kwargs):
@@ -784,6 +845,10 @@ class OrderPositionCreateSerializer(I18nAwareModelSerializer):
             raise ValidationError(
                 {'attendee_name': ['Do not specify attendee_name if you specified attendee_name_parts.']}
             )
+
+        if data.get('attendee_name_parts') and not isinstance(data.get('attendee_name_parts'), dict):
+            raise ValidationError({'attendee_name_parts': ['Invalid data type']})
+
         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
 
@@ -1086,6 +1151,10 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
 
                 seated = pos_data.get('item').seat_category_mappings.filter(subevent=pos_data.get('subevent')).exists()
                 if pos_data.get('seat'):
+                    if pos_data.get('addon_to'):
+                        errs[i]['seat'] = ['Seats are currently not supported for add-on products.']
+                        continue
+
                     if not seated:
                         errs[i]['seat'] = ['The specified product does not allow to choose a seat.']
                     try:
@@ -1281,6 +1350,9 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
 
             if not simulate:
                 for cp in delete_cps:
+                    if cp.addon_to_id:
+                        continue
+                    cp.addons.all().delete()
                     cp.delete()
 
         order.total = sum([p.price for p in pos_map.values()])

src/pretix/api/serializers/orderchange.py

@@ -158,12 +158,14 @@ class OrderPositionInfoPatchSerializer(serializers.ModelSerializer):
                 a.question_id: a for a in instance.answers.all()
             }
             for answ_data in answers_data:
+                if not answ_data.get('answer'):
+                    continue
                 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):
+                    if isinstance(answ_data.get('answer'), File):
                         a.file.save(answ_data['answer'].name, answ_data['answer'], save=False)
                         a.answer = 'file://' + a.file.name
                     elif a.answer.startswith('file://') and answ_data['answer'] == "file:keep":
@@ -173,7 +175,7 @@ class OrderPositionInfoPatchSerializer(serializers.ModelSerializer):
                             setattr(a, attr, value)
                     a.save()
                 else:
-                    if isinstance(answ_data['answer'], File):
+                    if isinstance(answ_data.get('answer'), File):
                         an = answ_data.pop('answer')
                         a = instance.answers.create(**answ_data, answer='')
                         a.file.save(os.path.basename(an.name), an, save=False)

src/pretix/api/serializers/organizer.py

@@ -79,6 +79,13 @@ class CustomerSerializer(I18nAwareModelSerializer):
             validated_data['external_identifier'] = instance.external_identifier
         return super().update(instance, validated_data)
 
+    def validate(self, data):
+        if data.get('name_parts') and not isinstance(data.get('name_parts'), dict):
+            raise ValidationError({'name_parts': ['Invalid data type']})
+        if data.get('name_parts') and '_scheme' not in data.get('name_parts'):
+            data['name_parts']['_scheme'] = self.context['request'].organizer.settings.name_scheme
+        return data
+
 
 class CustomerCreateSerializer(CustomerSerializer):
     send_email = serializers.BooleanField(default=False, required=False, allow_null=True)

src/pretix/api/serializers/voucher.py

@@ -61,7 +61,7 @@ class VoucherSerializer(I18nAwareModelSerializer):
 
     class Meta:
         model = Voucher
-        fields = ('id', 'code', 'max_usages', 'redeemed', 'valid_until', 'block_quota',
+        fields = ('id', 'code', 'max_usages', 'redeemed', 'min_usages', 'valid_until', 'block_quota',
                   'allow_ignore_quota', 'price_mode', 'value', 'item', 'variation', 'quota',
                   'tag', 'comment', 'subevent', 'show_hidden_items', 'seat')
         read_only_fields = ('id', 'redeemed')

src/pretix/api/urls.py

@@ -35,7 +35,8 @@
 import importlib
 
 from django.apps import apps
-from django.conf.urls import include, re_path
+from django.conf.urls import re_path
+from django.urls import include
 from rest_framework import routers
 
 from pretix.api.views import cart

src/pretix/api/views/cart.py

@@ -19,19 +19,28 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
+from collections import Counter
+from typing import List
+
 from django.db import transaction
+from django.utils.crypto import get_random_string
+from django.utils.functional import cached_property
+from django.utils.translation import gettext as _
 from rest_framework import status, viewsets
 from rest_framework.decorators import action
 from rest_framework.exceptions import ValidationError
 from rest_framework.filters import OrderingFilter
 from rest_framework.mixins import CreateModelMixin, DestroyModelMixin
 from rest_framework.response import Response
-from rest_framework.settings import api_settings
+from rest_framework.serializers import as_serializer_error
 
 from pretix.api.serializers.cart import (
     CartPositionCreateSerializer, CartPositionSerializer,
 )
 from pretix.base.models import CartPosition
+from pretix.base.services.cart import (
+    _get_quota_availability, _get_voucher_availability, error_messages,
+)
 from pretix.base.services.locking import NoLockManager
 
 
@@ -54,18 +63,17 @@ class CartPositionViewSet(CreateModelMixin, DestroyModelMixin, viewsets.ReadOnly
     def get_serializer_context(self):
         ctx = super().get_serializer_context()
         ctx['event'] = self.request.event
-        ctx['quota_cache'] = {}
+        ctx['quotas_for_item_cache'] = {}
+        ctx['quotas_for_variation_cache'] = {}
         return ctx
 
     def create(self, request, *args, **kwargs):
-        serializer = CartPositionCreateSerializer(data=request.data, context=self.get_serializer_context())
+        ctx = self.get_serializer_context()
+        serializer = CartPositionCreateSerializer(data=request.data, context=ctx)
         serializer.is_valid(raise_exception=True)
-        with transaction.atomic(), self.request.event.lock():
-            self.perform_create(serializer)
-        cp = serializer.instance
-        serializer = CartPositionSerializer(cp, context=serializer.context)
+        results = self._create(serializers=[serializer], raise_exception=True, ctx=ctx)
         headers = self.get_success_headers(serializer.data)
-        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
+        return Response(results[0]['data'], status=status.HTTP_201_CREATED, headers=headers)
 
     @action(detail=False, methods=['POST'])
     def bulk_create(self, request, *args, **kwargs):
@@ -73,42 +81,163 @@ class CartPositionViewSet(CreateModelMixin, DestroyModelMixin, viewsets.ReadOnly
             return Response({"error": "Please supply a list"}, status=status.HTTP_400_BAD_REQUEST)
 
         ctx = self.get_serializer_context()
-        with transaction.atomic():
-            serializers = [
-                CartPositionCreateSerializer(data=d, context=ctx)
-                for d in request.data
-            ]
-
-            lockfn = self.request.event.lock
-            if not any(s.is_valid(raise_exception=False) for s in serializers):
-                lockfn = NoLockManager
-
-            results = []
-            with lockfn():
-                for s in serializers:
-                    if s.is_valid(raise_exception=False):
-                        try:
-                            cp = s.save()
-                        except ValidationError as e:
-                            results.append({
-                                'success': False,
-                                'data': None,
-                                'errors': {api_settings.NON_FIELD_ERRORS_KEY: e.detail},
-                            })
-                        else:
-                            results.append({
-                                'success': True,
-                                'data': CartPositionSerializer(cp, context=ctx).data,
-                                'errors': None,
-                            })
-                    else:
-                        results.append({
-                            'success': False,
-                            'data': None,
-                            'errors': s.errors,
-                        })
+        serializers = [
+            CartPositionCreateSerializer(data=d, context=ctx)
+            for d in request.data
+        ]
 
+        results = self._create(serializers=serializers, raise_exception=False, ctx=ctx)
         return Response({'results': results}, status=status.HTTP_200_OK)
 
     def perform_create(self, serializer):
-        serializer.save()
+        raise NotImplementedError()
+
+    @transaction.atomic()
+    def perform_destroy(self, instance):
+        instance.addons.all().delete()
+        instance.delete()
+
+    def _require_locking(self, quota_diff, voucher_use_diff, seat_diff):
+        if voucher_use_diff or seat_diff:
+            # If any vouchers or seats are used, we lock to make sure we don't redeem them to often
+            return True
+
+        if quota_diff and any(q.size is not None for q in quota_diff):
+            # If any quotas are affected that are not unlimited, we lock
+            return True
+
+        return False
+
+    @cached_property
+    def _create_default_cart_id(self):
+        cid = "{}@api".format(get_random_string(48))
+        while CartPosition.objects.filter(cart_id=cid).exists():
+            cid = "{}@api".format(get_random_string(48))
+        return cid
+
+    def _create(self, serializers: List[CartPositionCreateSerializer], ctx, raise_exception=False):
+        voucher_use_diff = Counter()
+        quota_diff = Counter()
+        seat_diff = Counter()
+        results = [{} for pserializer in serializers]
+
+        for i, pserializer in enumerate(serializers):
+            if not pserializer.is_valid(raise_exception=raise_exception):
+                results[i] = {
+                    'success': False,
+                    'data': None,
+                    'errors': pserializer.errors,
+                }
+
+        for pserializer in serializers:
+            if pserializer.errors:
+                continue
+
+            validated_data = pserializer.validated_data
+            if not validated_data.get('cart_id'):
+                validated_data['cart_id'] = self._create_default_cart_id
+
+            if validated_data.get('voucher'):
+                voucher_use_diff[validated_data['voucher']] += 1
+
+            if validated_data.get('seat'):
+                seat_diff[validated_data['seat']] += 1
+
+            for q in validated_data['_quotas']:
+                quota_diff[q] += 1
+            for sub_data in validated_data.get('addons', []) + validated_data.get('bundled', []):
+                for q in sub_data['_quotas']:
+                    quota_diff[q] += 1
+
+        seats_seen = set()
+
+        lockfn = NoLockManager
+        if self._require_locking(quota_diff, voucher_use_diff, seat_diff):
+            lockfn = self.request.event.lock
+
+        with lockfn() as now_dt, transaction.atomic():
+            vouchers_ok, vouchers_depend_on_cart = _get_voucher_availability(
+                self.request.event,
+                voucher_use_diff,
+                now_dt,
+                exclude_position_ids=[],
+            )
+            quotas_ok = _get_quota_availability(quota_diff, now_dt)
+
+            for i, pserializer in enumerate(serializers):
+                if results[i]:
+                    continue
+
+                try:
+                    validated_data = pserializer.validated_data
+
+                    if validated_data.get('seat'):
+                        # Assumption: Add-ons currently can't have seats
+                        if validated_data['seat'] in seats_seen:
+                            raise ValidationError(error_messages['seat_multiple'])
+                        seats_seen.add(validated_data['seat'])
+
+                    quotas_needed = Counter()
+                    for q in validated_data['_quotas']:
+                        quotas_needed[q] += 1
+                    for sub_data in validated_data.get('addons', []) + validated_data.get('bundled', []):
+                        for q in sub_data['_quotas']:
+                            quotas_needed[q] += 1
+
+                    for q, needed in quotas_needed.items():
+                        if quotas_ok[q] < needed:
+                            raise ValidationError(
+                                _('There is not enough quota available on quota "{}" to perform the operation.').format(
+                                    q.name
+                                )
+                            )
+
+                    if validated_data.get('voucher'):
+                        # Assumption: Add-ons currently can't have vouchers, thus we only need to check the main voucher
+                        if vouchers_ok[validated_data['voucher']] < 1:
+                            raise ValidationError(
+                                {'voucher': [_('The specified voucher has already been used the maximum number of times.')]}
+                            )
+
+                    if validated_data.get('seat'):
+                        # Assumption: Add-ons currently can't have seats, thus we only need to check the main product
+                        if not validated_data['seat'].is_available(
+                            sales_channel=validated_data.get('sales_channel', 'web'),
+                            distance_ignore_cart_id=validated_data['cart_id'],
+                            ignore_voucher_id=validated_data['voucher'].pk if validated_data.get('voucher') else None,
+                        ):
+                            raise ValidationError(
+                                {'seat': [_('The selected seat "{seat}" is not available.').format(seat=validated_data['seat'].name)]}
+                            )
+
+                    for q, needed in quotas_needed.items():
+                        quotas_ok[q] -= needed
+                    if validated_data.get('voucher'):
+                        vouchers_ok[validated_data['voucher']] -= 1
+
+                    if any(qa < 0 for qa in quotas_ok.values()):
+                        # Safeguard, should never happen because of conditions above
+                        raise ValidationError(error_messages['unavailable'])
+
+                    cp = pserializer.create(validated_data)
+
+                    d = CartPositionSerializer(cp, context=ctx).data
+                    addons = sorted(cp.addons.all(), key=lambda a: a.pk)  # order of creation, safe since they are created in the same transaction
+                    d['addons'] = CartPositionSerializer([a for a in addons if not a.is_bundled], many=True, context=ctx).data
+                    d['bundled'] = CartPositionSerializer([a for a in addons if a.is_bundled], many=True, context=ctx).data
+
+                    results[i] = {
+                        'success': True,
+                        'data': d,
+                        'errors': None,
+                    }
+                except ValidationError as e:
+                    if raise_exception:
+                        raise
+                    results[i] = {
+                        'success': False,
+                        'data': None,
+                        'errors': as_serializer_error(e),
+                    }
+
+        return results

src/pretix/api/views/checkin.py

@@ -93,8 +93,10 @@ with scopes_disabled():
 class CheckinListViewSet(viewsets.ModelViewSet):
     serializer_class = CheckinListSerializer
     queryset = CheckinList.objects.none()
-    filter_backends = (DjangoFilterBackend,)
+    filter_backends = (DjangoFilterBackend, RichOrderingFilter)
     filterset_class = CheckinListFilter
+    ordering = ('subevent__date_from', 'name', 'id')
+    ordering_fields = ('subevent__date_from', 'id', 'name',)
 
     def _get_permission_name(self, request):
         if request.path.endswith('/failed_checkins/'):
@@ -682,7 +684,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
     serializer_class = CheckinListOrderPositionSerializer
     queryset = OrderPosition.all.none()
     filter_backends = (ExtendedBackend, RichOrderingFilter)
-    ordering = (F('attendee_name_cached').asc(nulls_last=True), 'positionid')
+    ordering = (F('attendee_name_cached').asc(nulls_last=True), 'pk')
     ordering_fields = (
         'order__code', 'order__datetime', 'positionid', 'attendee_name',
         'last_checked_in', 'order__email',

src/pretix/api/views/event.py

@@ -33,6 +33,7 @@
 # License for the specific language governing permissions and limitations under the License.
 
 import django_filters
+from django.conf import settings
 from django.db import transaction
 from django.db.models import Prefetch, ProtectedError, Q
 from django.utils.timezone import now
@@ -241,13 +242,17 @@ class EventViewSet(viewsets.ModelViewSet):
             except Event.DoesNotExist:
                 raise ValidationError('Event to copy from was not found')
 
+        # Ensure that .installed() is only called when we NOT clone
+        plugins = serializer.validated_data.pop('plugins', None)
+        serializer.validated_data['plugins'] = None
+
         new_event = serializer.save(organizer=self.request.organizer)
 
         if copy_from:
             new_event.copy_data_from(copy_from)
 
-            if 'plugins' in serializer.validated_data:
-                new_event.set_active_plugins(serializer.validated_data['plugins'])
+            if plugins is not None:
+                new_event.set_active_plugins(plugins)
             if 'is_public' in serializer.validated_data:
                 new_event.is_public = serializer.validated_data['is_public']
             if 'testmode' in serializer.validated_data:
@@ -256,12 +261,17 @@ class EventViewSet(viewsets.ModelViewSet):
                 new_event.sales_channels = serializer.validated_data['sales_channels']
             if 'has_subevents' in serializer.validated_data:
                 new_event.has_subevents = serializer.validated_data['has_subevents']
+            if 'date_admission' in serializer.validated_data:
+                new_event.date_admission = serializer.validated_data['date_admission']
             new_event.save()
             if 'timezone' in serializer.validated_data:
                 new_event.settings.timezone = serializer.validated_data['timezone']
         else:
             serializer.instance.set_defaults()
 
+            new_event.set_active_plugins(plugins if plugins is not None else settings.PRETIX_PLUGINS_DEFAULT.split(','))
+            new_event.save(update_fields=['plugins'])
+
         serializer.instance.log_action(
             'pretix.event.added',
             user=self.request.user,
@@ -322,6 +332,7 @@ with scopes_disabled():
         ends_after = django_filters.rest_framework.IsoDateTimeFilter(method='ends_after_qs')
         modified_since = django_filters.IsoDateTimeFilter(field_name='last_modified', lookup_expr='gte')
         sales_channel = django_filters.rest_framework.CharFilter(method='sales_channel_qs')
+        search = django_filters.rest_framework.CharFilter(method='search_qs')
 
         class Meta:
             model = SubEvent
@@ -357,6 +368,12 @@ with scopes_disabled():
         def sales_channel_qs(self, queryset, name, value):
             return queryset.filter(event__sales_channels__contains=value)
 
+        def search_qs(self, queryset, name, value):
+            return queryset.filter(
+                Q(name__icontains=i18ncomp(value))
+                | Q(location__icontains=i18ncomp(value))
+            )
+
 
 class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
     serializer_class = SubEventSerializer

src/pretix/api/views/exporters.py

@@ -35,7 +35,8 @@ from rest_framework.reverse import reverse
 from pretix.api.serializers.exporters import (
     ExporterSerializer, JobRunSerializer,
 )
-from pretix.base.models import CachedFile, Device, TeamAPIToken
+from pretix.base.exporter import OrganizerLevelExportMixin
+from pretix.base.models import CachedFile, Device, Event, TeamAPIToken
 from pretix.base.services.export import export, multiexport
 from pretix.base.signals import (
     register_data_exporters, register_multievent_data_exporters,
@@ -155,7 +156,19 @@ class OrganizerExportersViewSet(ExportersMixin, viewsets.ViewSet):
             organizer=self.request.organizer
         )
         responses = register_multievent_data_exporters.send(self.request.organizer)
-        for ex in sorted([response(events, self.request.organizer) for r, response in responses if response], key=lambda ex: str(ex.verbose_name)):
+        raw_exporters = [
+            response(Event.objects.none() if issubclass(response, OrganizerLevelExportMixin) else events, self.request.organizer)
+            for r, response in responses
+            if response
+        ]
+        raw_exporters = [
+            ex for ex in raw_exporters
+            if (
+                not isinstance(ex, OrganizerLevelExportMixin) or
+                perm_holder.has_organizer_permission(self.request.organizer, ex.organizer_required_permission, self.request)
+            )
+        ]
+        for ex in sorted(raw_exporters, key=lambda ex: str(ex.verbose_name)):
             ex._serializer = JobRunSerializer(exporter=ex, events=events)
             exporters.append(ex)
         return exporters

src/pretix/api/views/item.py

@@ -84,7 +84,9 @@ class ItemViewSet(ConditionalListView, viewsets.ModelViewSet):
 
     def get_queryset(self):
         return self.request.event.items.select_related('tax_rule').prefetch_related(
-            'variations', 'addons', 'bundles', 'meta_values'
+            'variations', 'addons', 'bundles', 'meta_values', 'meta_values__property',
+            'variations__meta_values', 'variations__meta_values__property',
+            'require_membership_types', 'variations__require_membership_types',
         ).all()
 
     def perform_create(self, serializer):
@@ -147,7 +149,11 @@ class ItemVariationViewSet(viewsets.ModelViewSet):
         return get_object_or_404(Item, pk=self.kwargs['item'], event=self.request.event)
 
     def get_queryset(self):
-        return self.item.variations.all()
+        return self.item.variations.all().prefetch_related(
+            'meta_values',
+            'meta_values__property',
+            'require_membership_types'
+        )
 
     def get_serializer_context(self):
         ctx = super().get_serializer_context()

src/pretix/api/views/oauth.py

@@ -34,6 +34,7 @@ from oauth2_provider.views import (
 
 from pretix.api.models import OAuthApplication
 from pretix.base.models import Organizer
+from pretix.control.views.user import RecentAuthenticationRequiredMixin
 
 logger = logging.getLogger(__name__)
 
@@ -54,7 +55,7 @@ class OAuthAllowForm(AllowForm):
             del self.fields['organizers']
 
 
-class AuthorizationView(BaseAuthorizationView):
+class AuthorizationView(RecentAuthenticationRequiredMixin, BaseAuthorizationView):
     template_name = "pretixcontrol/auth/oauth_authorization.html"
     form_class = OAuthAllowForm
 

src/pretix/api/views/order.py

@@ -61,12 +61,14 @@ from pretix.api.serializers.orderchange import (
     OrderPositionCreateForExistingOrderSerializer,
     OrderPositionInfoPatchSerializer,
 )
+from pretix.api.views import RichOrderingFilter
 from pretix.base.i18n import language
 from pretix.base.models import (
     CachedCombinedTicket, CachedTicket, Checkin, Device, EventMetaValue,
-    Invoice, InvoiceAddress, ItemMetaValue, Order, OrderFee, OrderPayment,
-    OrderPosition, OrderRefund, Quota, SubEvent, SubEventMetaValue, TaxRule,
-    TeamAPIToken, generate_secret,
+    Invoice, InvoiceAddress, ItemMetaValue, ItemVariation,
+    ItemVariationMetaValue, Order, OrderFee, OrderPayment, OrderPosition,
+    OrderRefund, Quota, SubEvent, SubEventMetaValue, TaxRule, TeamAPIToken,
+    generate_secret,
 )
 from pretix.base.models.orders import QuestionAnswer, RevokedTicketSecret
 from pretix.base.payment import PaymentException
@@ -190,6 +192,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         ctx['event'] = self.request.event
         ctx['pdf_data'] = self.request.query_params.get('pdf_data', 'false') == 'true'
         ctx['exclude'] = self.request.query_params.getlist('exclude')
+        ctx['include'] = self.request.query_params.getlist('include')
         return ctx
 
     def get_queryset(self):
@@ -230,7 +233,9 @@ class OrderViewSet(viewsets.ModelViewSet):
                     Prefetch('item', queryset=self.request.event.items.prefetch_related(
                         Prefetch('meta_values', ItemMetaValue.objects.select_related('property'), to_attr='meta_values_cached')
                     )),
-                    'variation',
+                    Prefetch('variation', queryset=ItemVariation.objects.prefetch_related(
+                        Prefetch('meta_values', ItemVariationMetaValue.objects.select_related('property'), to_attr='meta_values_cached')
+                    )),
                     'answers', 'answers__options', 'answers__question',
                     'item__category',
                     'addon_to__answers', 'addon_to__answers__options', 'addon_to__answers__question',
@@ -679,28 +684,33 @@ class OrderViewSet(viewsets.ModelViewSet):
                 )
                 if order.require_approval:
                     email_template = request.event.settings.mail_text_order_placed_require_approval
+                    subject_template = request.event.settings.mail_subject_order_placed_require_approval
                     log_entry = 'pretix.event.order.email.order_placed_require_approval'
                     email_attendees = False
                 elif free_flow:
                     email_template = request.event.settings.mail_text_order_free
+                    subject_template = request.event.settings.mail_subject_order_free
                     log_entry = 'pretix.event.order.email.order_free'
                     email_attendees = request.event.settings.mail_send_order_free_attendee
                     email_attendees_template = request.event.settings.mail_text_order_free_attendee
+                    subject_attendees_template = request.event.settings.mail_subject_order_free_attendee
                 else:
                     email_template = request.event.settings.mail_text_order_placed
+                    subject_template = request.event.settings.mail_subject_order_placed
                     log_entry = 'pretix.event.order.email.order_placed'
                     email_attendees = request.event.settings.mail_send_order_placed_attendee
                     email_attendees_template = request.event.settings.mail_text_order_placed_attendee
+                    subject_attendees_template = request.event.settings.mail_subject_order_placed_attendee
 
                 _order_placed_email(
-                    request.event, order, payment.payment_provider if payment else None, email_template,
-                    log_entry, invoice, payment, is_free=free_flow
+                    request.event, order, email_template, subject_template,
+                    log_entry, invoice, [payment] if payment else [], is_free=free_flow
                 )
                 if email_attendees:
                     for p in order.positions.all():
                         if p.addon_to_id is None and p.attendee_email and p.attendee_email != order.email:
-                            _order_placed_email_attendee(request.event, order, p, email_attendees_template, log_entry,
-                                                         is_free=free_flow)
+                            _order_placed_email_attendee(request.event, order, p, email_attendees_template, subject_attendees_template,
+                                                         log_entry, is_free=free_flow)
 
                 if not free_flow and order.status == Order.STATUS_PAID and payment:
                     payment._send_paid_mail(invoice, None, '')
@@ -930,7 +940,7 @@ with scopes_disabled():
 class OrderPositionViewSet(viewsets.ModelViewSet):
     serializer_class = OrderPositionSerializer
     queryset = OrderPosition.all.none()
-    filter_backends = (DjangoFilterBackend, OrderingFilter)
+    filter_backends = (DjangoFilterBackend, RichOrderingFilter)
     ordering = ('order__datetime', 'positionid')
     ordering_fields = ('order__code', 'order__datetime', 'positionid', 'attendee_name', 'order__status',)
     filterset_class = OrderPositionFilter
@@ -992,7 +1002,11 @@ class OrderPositionViewSet(viewsets.ModelViewSet):
                                 Prefetch('meta_values', ItemMetaValue.objects.select_related('property'),
                                          to_attr='meta_values_cached')
                             )),
-                            'variation', 'answers', 'answers__options', 'answers__question',
+                            Prefetch('variation', queryset=self.request.event.items.prefetch_related(
+                                Prefetch('meta_values', ItemVariationMetaValue.objects.select_related('property'),
+                                         to_attr='meta_values_cached')
+                            )),
+                            'answers', 'answers__options', 'answers__question',
                             'item__category',
                             Prefetch('subevent', queryset=self.request.event.subevents.prefetch_related(
                                 Prefetch('meta_values', to_attr='meta_values_cached',
@@ -1604,6 +1618,17 @@ class RefundViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
                 user=request.user if request.user.is_authenticated else None,
                 auth=request.auth
             )
+
+            if r.state in (OrderRefund.REFUND_STATE_DONE, OrderRefund.REFUND_STATE_CANCELED, OrderRefund.REFUND_STATE_FAILED):
+                r.order.log_action(
+                    f'pretix.event.order.refund.{r.state}', {
+                        'local_id': r.local_id,
+                        'provider': r.provider,
+                    },
+                    user=request.user if request.user.is_authenticated else None,
+                    auth=request.auth
+                )
+
             if mark_refunded:
                 try:
                     mark_order_refunded(

src/pretix/api/views/organizer.py

@@ -51,6 +51,7 @@ from pretix.base.models import (
     User,
 )
 from pretix.base.settings import SETTINGS_AFFECTING_CSS
+from pretix.helpers import OF_SELF
 from pretix.helpers.dicts import merge_dicts
 from pretix.presale.style import regenerate_organizer_css
 
@@ -178,7 +179,7 @@ class GiftCardViewSet(viewsets.ModelViewSet):
     def perform_update(self, serializer):
         if 'include_accepted' in self.request.GET:
             raise PermissionDenied("Accepted gift cards cannot be updated, use transact instead.")
-        GiftCard.objects.select_for_update().get(pk=self.get_object().pk)
+        GiftCard.objects.select_for_update(of=OF_SELF).get(pk=self.get_object().pk)
         old_value = serializer.instance.value
         value = serializer.validated_data.pop('value')
         inst = serializer.save(secret=serializer.instance.secret, currency=serializer.instance.currency,
@@ -196,7 +197,7 @@ class GiftCardViewSet(viewsets.ModelViewSet):
     @action(detail=True, methods=["POST"])
     @transaction.atomic()
     def transact(self, request, **kwargs):
-        gc = GiftCard.objects.select_for_update().get(pk=self.get_object().pk)
+        gc = GiftCard.objects.select_for_update(of=OF_SELF).get(pk=self.get_object().pk)
         value = serializers.DecimalField(max_digits=10, decimal_places=2).to_internal_value(
             request.data.get('value')
         )

src/pretix/api/views/upload.py

@@ -21,6 +21,7 @@
 #
 import datetime
 
+from django.core.exceptions import ValidationError as DjangoValidationError
 from django.utils.timezone import now
 from oauth2_provider.contrib.rest_framework import OAuth2Authentication
 from rest_framework.authentication import SessionAuthentication
@@ -33,6 +34,9 @@ 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
+from pretix.helpers.images import (
+    IMAGE_TYPES, validate_uploaded_file_for_valid_image,
+)
 
 ALLOWED_TYPES = {
     'image/gif': {'.gif'},
@@ -61,6 +65,13 @@ class UploadView(APIView):
                 name=file_obj.name,
                 type=content_type
             ))
+
+        if content_type in IMAGE_TYPES:
+            try:
+                validate_uploaded_file_for_valid_image(file_obj)
+            except DjangoValidationError as e:
+                raise ValidationError(e.message)
+
         cf = CachedFile.objects.create(
             expires=now() + datetime.timedelta(days=1),
             date=now(),

src/pretix/api/webhooks.py

@@ -42,6 +42,7 @@ from pretix.base.models import LogEntry
 from pretix.base.services.tasks import ProfiledTask, TransactionAwareTask
 from pretix.base.signals import periodic_task
 from pretix.celery_app import app
+from pretix.helpers import OF_SELF
 
 logger = logging.getLogger(__name__)
 _ALL_EVENTS = None
@@ -502,7 +503,8 @@ def manually_retry_all_calls(webhook_id: int):
         webhook = WebHook.objects.get(id=webhook_id)
     with scope(organizer=webhook.organizer), transaction.atomic():
         for whcr in webhook.retries.select_for_update(
-            skip_locked=connection.features.has_select_for_update_skip_locked
+            skip_locked=connection.features.has_select_for_update_skip_locked,
+            of=OF_SELF
         ):
             send_webhook.apply_async(
                 args=(whcr.logentry_id, whcr.action_type, whcr.webhook_id, whcr.retry_count),
@@ -515,7 +517,8 @@ def manually_retry_all_calls(webhook_id: int):
 def schedule_webhook_retries_on_celery(sender, **kwargs):
     with transaction.atomic():
         for whcr in WebHookCallRetry.objects.select_for_update(
-            skip_locked=connection.features.has_select_for_update_skip_locked
+            skip_locked=connection.features.has_select_for_update_skip_locked,
+            of=OF_SELF
         ).filter(retry_not_before__lt=now()):
             send_webhook.apply_async(
                 args=(whcr.logentry_id, whcr.action_type, whcr.webhook_id, whcr.retry_count),

src/pretix/base/addressvalidation.py

@@ -0,0 +1,225 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from collections import defaultdict
+
+from django.core.exceptions import ValidationError
+from django.utils.translation import gettext_lazy as _
+from localflavor.ar.forms import ARPostalCodeField
+from localflavor.at.forms import ATZipCodeField
+from localflavor.au.forms import AUPostCodeField
+from localflavor.be.forms import BEPostalCodeField
+from localflavor.br.forms import BRZipCodeField
+from localflavor.ca.forms import CAPostalCodeField
+from localflavor.ch.forms import CHZipCodeField
+from localflavor.cn.forms import CNPostCodeField
+from localflavor.cu.forms import CUPostalCodeField
+from localflavor.cz.forms import CZPostalCodeField
+from localflavor.de.forms import DEZipCodeField
+from localflavor.dk.forms import DKPostalCodeField
+from localflavor.ee.forms import EEZipCodeField
+from localflavor.es.forms import ESPostalCodeField
+from localflavor.fi.forms import FIZipCodeField
+from localflavor.fr.forms import FRZipCodeField
+from localflavor.gb.forms import GBPostcodeField
+from localflavor.gr.forms import GRPostalCodeField
+from localflavor.hr.forms import HRPostalCodeField
+from localflavor.ie.forms import EircodeField
+from localflavor.il.forms import ILPostalCodeField
+from localflavor.in_.forms import INZipCodeField
+from localflavor.ir.forms import IRPostalCodeField
+from localflavor.is_.is_postalcodes import IS_POSTALCODES
+from localflavor.it.forms import ITZipCodeField
+from localflavor.jp.forms import JPPostalCodeField
+from localflavor.lt.forms import LTPostalCodeField
+from localflavor.lv.forms import LVPostalCodeField
+from localflavor.ma.forms import MAPostalCodeField
+from localflavor.mt.forms import MTPostalCodeField
+from localflavor.mx.forms import MXZipCodeField
+from localflavor.nl.forms import NLZipCodeField
+from localflavor.no.forms import NOZipCodeField
+from localflavor.nz.forms import NZPostCodeField
+from localflavor.pk.forms import PKPostCodeField
+from localflavor.pl.forms import PLPostalCodeField
+from localflavor.pt.forms import PTZipCodeField
+from localflavor.ro.forms import ROPostalCodeField
+from localflavor.ru.forms import RUPostalCodeField
+from localflavor.se.forms import SEPostalCodeField
+from localflavor.sg.forms import SGPostCodeField
+from localflavor.si.si_postalcodes import SI_POSTALCODES
+from localflavor.sk.forms import SKPostalCodeField
+from localflavor.tr.forms import TRPostalCodeField
+from localflavor.ua.forms import UAPostalCodeField
+from localflavor.us.forms import USZipCodeField
+from localflavor.za.forms import ZAPostCodeField
+
+from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
+
+_validator_classes = defaultdict(list)
+
+COUNTRIES_WITH_STREET_ZIPCODE_AND_CITY_REQUIRED = {
+    # We don't presume this for countries we don't have knowledge about, there are countries in the
+    # world e.g. without zipcodes
+    'AR', 'AT', 'AU', 'BE', 'BR', 'CA', 'CH', 'CN', 'CU', 'CZ', 'DE', 'DK', 'EE', 'ES', 'FI', 'FR',
+    'GB', 'GR', 'HR', 'IE', 'IL', 'IN', 'IR', 'IS', 'IT', 'JP', 'LT', 'LV', 'MA', 'MT', 'MX', 'NL',
+    'NO', 'NZ', 'PK', 'PL', 'PT', 'RO', 'RU', 'SE', 'SG', 'SI', 'SK', 'TR', 'UA', 'US', 'ZA',
+}
+
+
+def validate_address(address: dict, all_optional=False):
+    """
+    :param address: A dictionary with at least the entries ``street``, ``zipcode``, ``city``, ``country``,
+                    ``state``
+    :return: The dictionary, possibly with changes
+    """
+    if not address.get('street') and not address.get('zipcode') and not address.get('city'):
+        # Consider the actual address part to be empty, no further validation necessary, if the
+        # address should be required, it's the callers job to validate that at least one of these
+        # fields is filled
+        return address
+
+    if not address.get('country'):
+        raise ValidationError({'country': [_('This field is required.')]})
+
+    if str(address['country']) in COUNTRIES_WITH_STATE_IN_ADDRESS and not address.get('state') and not all_optional:
+        raise ValidationError({'state': [_('This field is required.')]})
+
+    if str(address['country']) in COUNTRIES_WITH_STREET_ZIPCODE_AND_CITY_REQUIRED and not all_optional:
+        for f in ('street', 'zipcode', 'city'):
+            if not address.get(f):
+                raise ValidationError({f: [_('This field is required.')]})
+
+    for klass in _validator_classes[str(address['country'])]:
+        validator = klass()
+        try:
+            if address.get('zipcode'):
+                address['zipcode'] = validator.validate_zipcode(address['zipcode'])
+        except ValidationError as e:
+            raise ValidationError({'zipcode': list(e)})
+
+    return address
+
+
+def register_validator_for(country):
+    def inner(klass):
+        _validator_classes[country].append(klass)
+        return klass
+
+    return inner
+
+
+class BaseValidator:
+    required_fields = []
+
+    def validate_zipcode(self, value):
+        return value
+
+
+"""
+Currently, mostly have validators that are auto-generated from django-localflavor
+but custom ones can be added like this:
+
+@register_validator_for('DE')
+class DEValidator(BaseValidator):
+    def validate_zipcode(value):
+        return value
+
+In the future, we can also add additional methods to validate that e.g. a city
+is plausible for a given zip code.
+"""
+
+_zip_code_fields = {
+    'AR': ARPostalCodeField,
+    'AT': ATZipCodeField,
+    'AU': AUPostCodeField,
+    'BE': BEPostalCodeField,
+    'BR': BRZipCodeField,
+    'CA': CAPostalCodeField,
+    'CH': CHZipCodeField,
+    'CN': CNPostCodeField,
+    'CU': CUPostalCodeField,
+    'CZ': CZPostalCodeField,
+    'DE': DEZipCodeField,
+    'DK': DKPostalCodeField,
+    'EE': EEZipCodeField,
+    'ES': ESPostalCodeField,
+    'FI': FIZipCodeField,
+    'FR': FRZipCodeField,
+    'GB': GBPostcodeField,
+    'GR': GRPostalCodeField,
+    'HR': HRPostalCodeField,
+    'IE': EircodeField,
+    'IL': ILPostalCodeField,
+    'IN': INZipCodeField,
+    'IR': IRPostalCodeField,
+    'IT': ITZipCodeField,
+    'JP': JPPostalCodeField,
+    'LT': LTPostalCodeField,
+    'LV': LVPostalCodeField,
+    'MA': MAPostalCodeField,
+    'MT': MTPostalCodeField,
+    'MX': MXZipCodeField,
+    'NL': NLZipCodeField,
+    'NO': NOZipCodeField,
+    'NZ': NZPostCodeField,
+    'PK': PKPostCodeField,
+    'PL': PLPostalCodeField,
+    'PT': PTZipCodeField,
+    'RO': ROPostalCodeField,
+    'RU': RUPostalCodeField,
+    'SE': SEPostalCodeField,
+    'SG': SGPostCodeField,
+    'SK': SKPostalCodeField,
+    'TR': TRPostalCodeField,
+    'UA': UAPostalCodeField,
+    'US': USZipCodeField,
+    'ZA': ZAPostCodeField,
+}
+
+
+def _generate_class_from_zipcode_field(field_class):
+    class _GeneratedValidator(BaseValidator):
+        def validate_zipcode(self, value):
+            return field_class().clean(value)
+    return _GeneratedValidator
+
+
+for cc, field_class in _zip_code_fields.items():
+    register_validator_for(cc)(_generate_class_from_zipcode_field(field_class))
+
+
+@register_validator_for('IS')
+class ISValidator(BaseValidator):
+    def validate_zipcode(self, value):
+        if value not in [entry[0] for entry in IS_POSTALCODES]:
+            raise ValidationError(_('Enter a postal code in the format XXX.'), code='invalid')
+        return value
+
+
+@register_validator_for('SI')
+class SIValidator(BaseValidator):
+    def validate_zipcode(self, value):
+        try:
+            if int(value) not in [entry[0] for entry in SI_POSTALCODES]:
+                raise ValidationError(_('Enter a postal code in the format XXXX.'), code='invalid')
+        except ValueError:
+            raise ValidationError(_('Enter a postal code in the format XXXX.'), code='invalid')
+        return value

src/pretix/base/email.py

@@ -320,13 +320,18 @@ def get_email_context(**kwargs):
     return ctx
 
 
-def _placeholder_payment(order, payment):
-    if not payment:
-        return None
-    if 'payment' in inspect.signature(payment.payment_provider.order_pending_mail_render).parameters:
-        return str(payment.payment_provider.order_pending_mail_render(order, payment))
+def _placeholder_payments(order, payments):
+    d = []
+    for payment in payments:
+        if 'payment' in inspect.signature(payment.payment_provider.order_pending_mail_render).parameters:
+            d.append(str(payment.payment_provider.order_pending_mail_render(order, payment)))
+        else:
+            d.append(str(payment.payment_provider.order_pending_mail_render(order)))
+    d = [line for line in d if line.strip()]
+    if d:
+        return '\n\n'.join(d)
     else:
-        return str(payment.payment_provider.order_pending_mail_render(order))
+        return ''
 
 
 def get_best_name(position_or_address, parts=False):
@@ -376,6 +381,14 @@ def base_placeholders(sender, **kwargs):
         SimpleFunctionalMailTextPlaceholder(
             'currency', ['event'], lambda event: event.currency, lambda event: event.currency
         ),
+        SimpleFunctionalMailTextPlaceholder(
+            'order_email', ['order'], lambda order: order.email, 'john@example.org'
+        ),
+        SimpleFunctionalMailTextPlaceholder(
+            'invoice_number', ['invoice'],
+            lambda invoice: invoice.full_invoice_no,
+            f'{sender.settings.invoice_numbers_prefix or (sender.slug.upper() + "-")}00000'
+        ),
         SimpleFunctionalMailTextPlaceholder(
             'refund_amount', ['event_or_subevent', 'refund_amount'],
             lambda event_or_subevent, refund_amount: LazyCurrencyNumber(refund_amount, event_or_subevent.currency),
@@ -507,20 +520,20 @@ def base_placeholders(sender, **kwargs):
             lambda event: (event if not event.has_subevents or not event.subevents.exists() else event.subevents.first()).get_date_from_display()
         ),
         SimpleFunctionalMailTextPlaceholder(
-            'url_remove', ['waiting_list_entry', 'event'],
-            lambda waiting_list_entry, event: build_absolute_uri(
+            'url_remove', ['waiting_list_voucher', 'event'],
+            lambda waiting_list_voucher, event: build_absolute_uri(
                 event, 'presale:event.waitinglist.remove'
-            ) + '?voucher=' + waiting_list_entry.voucher.code,
+            ) + '?voucher=' + waiting_list_voucher.code,
             lambda event: build_absolute_uri(
                 event,
                 'presale:event.waitinglist.remove',
             ) + '?voucher=68CYU2H6ZTP3WLK5',
         ),
         SimpleFunctionalMailTextPlaceholder(
-            'url', ['waiting_list_entry', 'event'],
-            lambda waiting_list_entry, event: build_absolute_uri(
+            'url', ['waiting_list_voucher', 'event'],
+            lambda waiting_list_voucher, event: build_absolute_uri(
                 event, 'presale:event.redeem'
-            ) + '?voucher=' + waiting_list_entry.voucher.code,
+            ) + '?voucher=' + waiting_list_voucher.code,
             lambda event: build_absolute_uri(
                 event,
                 'presale:event.redeem',
@@ -575,7 +588,7 @@ def base_placeholders(sender, **kwargs):
             _('Sample Admission Ticket')
         ),
         SimpleFunctionalMailTextPlaceholder(
-            'code', ['waiting_list_entry'], lambda waiting_list_entry: waiting_list_entry.voucher.code,
+            'code', ['waiting_list_voucher'], lambda waiting_list_voucher: waiting_list_voucher.code,
             '68CYU2H6ZTP3WLK5'
         ),
         SimpleFunctionalMailTextPlaceholder(
@@ -617,7 +630,7 @@ def base_placeholders(sender, **kwargs):
             _('An individual text with a reason can be inserted here.'),
         ),
         SimpleFunctionalMailTextPlaceholder(
-            'payment_info', ['order', 'payment'], _placeholder_payment,
+            'payment_info', ['order', 'payments'], _placeholder_payments,
             _('The amount has been charged to your card.'),
         ),
         SimpleFunctionalMailTextPlaceholder(

src/pretix/base/exporter.py

@@ -36,7 +36,7 @@ import io
 import tempfile
 from collections import OrderedDict, namedtuple
 from decimal import Decimal
-from typing import Tuple
+from typing import Optional, Tuple
 
 import pytz
 from defusedcsv import csv
@@ -51,7 +51,7 @@ from pretix.helpers.safe_openpyxl import (  # NOQA: backwards compatibility for
     SafeWorkbook, remove_invalid_excel_chars as excel_safe,
 )
 
-__ = excel_safe  # just so the compatbility import above is "used" and doesn't get removed by linter
+__ = excel_safe  # just so the compatibility import above is "used" and doesn't get removed by linter
 
 
 class BaseExporter:
@@ -80,10 +80,31 @@ class BaseExporter:
     def verbose_name(self) -> str:
         """
         A human-readable name for this exporter. This should be short but
-        self-explaining. Good examples include 'JSON' or 'Microsoft Excel'.
+        self-explaining. Good examples include 'Orders as JSON' or 'Orders as Microsoft Excel'.
         """
         raise NotImplementedError()  # NOQA
 
+    @property
+    def description(self) -> str:
+        """
+        A description for this exporter.
+        """
+        return ""
+
+    @property
+    def category(self) -> Optional[str]:
+        """
+        A category name for this exporter, or ``None``.
+        """
+        return None
+
+    @property
+    def featured(self) -> bool:
+        """
+        If ``True``, this exporter will be highlighted.
+        """
+        return False
+
     @property
     def identifier(self) -> str:
         """
@@ -137,6 +158,16 @@ class BaseExporter:
         raise NotImplementedError()  # NOQA
 
 
+class OrganizerLevelExportMixin:
+    @property
+    def organizer_required_permission(self) -> str:
+        """
+        The permission level required to use this exporter. Only useful for organizer-level exports,
+        not for event-level exports.
+        """
+        return 'can_view_orders'
+
+
 class ListExporter(BaseExporter):
     ProgressSetTotal = namedtuple('ProgressSetTotal', 'total')
 

src/pretix/base/exporters/__init__.py

@@ -20,6 +20,7 @@
 # <https://www.gnu.org/licenses/>.
 #
 from .answers import *  # noqa
+from .customers import *  # noqa
 from .dekodi import *  # noqa
 from .events import *  # noqa
 from .invoices import *  # noqa

src/pretix/base/exporters/answers.py

@@ -39,7 +39,7 @@ from zipfile import ZipFile
 
 from django import forms
 from django.dispatch import receiver
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
 
 from pretix.base.models import QuestionAnswer
 
@@ -49,7 +49,10 @@ from ..signals import register_data_exporters
 
 class AnswerFilesExporter(BaseExporter):
     identifier = 'answerfiles'
-    verbose_name = _('Answers to file upload questions')
+    verbose_name = _('Question answer file uploads')
+    category = pgettext_lazy('export_category', 'Order data')
+    description = _('Download a ZIP file including all files that have been uploaded by your customers while creating '
+                    'an order.')
 
     @property
     def export_form_fields(self):

src/pretix/base/exporters/customers.py

@@ -0,0 +1,115 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+
+# This file is based on an earlier version of pretix which was released under the Apache License 2.0. The full text of
+# the Apache License 2.0 can be obtained at <http://www.apache.org/licenses/LICENSE-2.0>.
+#
+# This file may have since been changed and any changes are released under the terms of AGPLv3 as described above. A
+# full history of changes and contributors is available at <https://github.com/pretix/pretix>.
+#
+# This file contains Apache-licensed contributions copyrighted by: Benjamin Hättasch, Tobias Kunze
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the Apache License 2.0 is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under the License.
+
+from collections import OrderedDict
+
+from django.dispatch import receiver
+from django.utils.timezone import get_current_timezone
+from django.utils.translation import gettext as _, gettext_lazy, pgettext_lazy
+
+from pretix.base.settings import PERSON_NAME_SCHEMES
+
+from ..exporter import ListExporter, OrganizerLevelExportMixin
+from ..signals import register_multievent_data_exporters
+
+
+class CustomerListExporter(OrganizerLevelExportMixin, ListExporter):
+    identifier = 'customerlist'
+    verbose_name = gettext_lazy('Customer accounts')
+    organizer_required_permission = 'can_manage_customers'
+    category = pgettext_lazy('export_category', 'Customer accounts')
+    description = gettext_lazy('Download a spreadsheet of all currently registered customer accounts.')
+
+    @property
+    def additional_form_fields(self):
+        return OrderedDict(
+            []
+        )
+
+    def iterate_list(self, form_data):
+        qs = self.organizer.customers.prefetch_related('provider')
+
+        headers = [
+            _('Customer ID'),
+            _('SSO provider'),
+            _('External identifier'),
+            _('E-mail'),
+            _('Phone number'),
+            _('Full name'),
+        ]
+        name_scheme = PERSON_NAME_SCHEMES[self.organizer.settings.name_scheme]
+        if name_scheme and len(name_scheme['fields']) > 1:
+            for k, label, w in name_scheme['fields']:
+                headers.append(_('Name') + ': ' + str(label))
+
+        headers += [
+            _('Account active'),
+            _('Verified email address'),
+            _('Last login'),
+            _('Registration date'),
+            _('Language'),
+            _('Notes'),
+        ]
+        yield headers
+
+        tz = get_current_timezone()
+        for obj in qs:
+            row = [
+                obj.identifier,
+                obj.provider.name if obj.provider else None,
+                obj.external_identifier,
+                obj.email or '',
+                obj.phone or '',
+                obj.name,
+            ]
+            if name_scheme and len(name_scheme['fields']) > 1:
+                for k, label, w in name_scheme['fields']:
+                    row.append(obj.name_parts.get(k, ''))
+            row += [
+                _('Yes') if obj.is_active else _('No'),
+                _('Yes') if obj.is_verified else _('No'),
+                obj.last_login.astimezone(tz).date().strftime('%Y-%m-%d') if obj.last_login else '',
+                obj.date_joined.astimezone(tz).date().strftime('%Y-%m-%d') if obj.date_joined else '',
+                obj.get_locale_display(),
+                obj.notes or '',
+            ]
+            yield row
+
+    def get_filename(self):
+        return '{}_customers'.format(self.organizer.slug)
+
+
+@receiver(register_multievent_data_exporters, dispatch_uid="multiexporter_customerlist")
+def register_multievent_i_customerlist_exporter(sender, **kwargs):
+    return CustomerListExporter

src/pretix/base/exporters/dekodi.py

@@ -23,22 +23,24 @@ import json
 from collections import OrderedDict
 from decimal import Decimal
 
-import dateutil
-from django import forms
 from django.core.serializers.json import DjangoJSONEncoder
 from django.dispatch import receiver
-from django.utils.translation import gettext, gettext_lazy
+from django.utils.timezone import now
+from django.utils.translation import gettext, gettext_lazy, pgettext_lazy
 
 from pretix.base.i18n import language
 from pretix.base.models import Invoice, OrderPayment
 
 from ..exporter import BaseExporter
 from ..signals import register_data_exporters
+from ..timeframes import DateFrameField, resolve_timeframe_to_dates_inclusive
 
 
 class DekodiNREIExporter(BaseExporter):
     identifier = 'dekodi_nrei'
     verbose_name = 'dekodi NREI (JSON)'
+    category = pgettext_lazy('export_category', 'Invoices')
+    description = gettext_lazy("Download invoices in a format that can be used by the dekodi NREI conversion software.")
 
     # Specification: http://manuals.dekodi.de/nexuspub/schnittstellenbuch/
 
@@ -113,7 +115,7 @@ class DekodiNREIExporter(BaseExporter):
                         'PTNo14': p.info_data.get('reference') or '',
                         'PTNo15': p.full_id or '',
                     })
-            elif p.provider.startswith('stripe'):
+            elif p.provider and p.provider.startswith('stripe'):
                 src = p.info_data.get("source", p.info_data)
                 payments.append({
                     'PTID': '81',
@@ -192,17 +194,12 @@ class DekodiNREIExporter(BaseExporter):
     def render(self, form_data):
         qs = self.event.invoices.select_related('order').prefetch_related('lines', 'lines__subevent')
 
-        if form_data.get('date_from'):
-            date_value = form_data.get('date_from')
-            if isinstance(date_value, str):
-                date_value = dateutil.parser.parse(date_value).date()
-            qs = qs.filter(date__gte=date_value)
-
-        if form_data.get('date_to'):
-            date_value = form_data.get('date_to')
-            if isinstance(date_value, str):
-                date_value = dateutil.parser.parse(date_value).date()
-            qs = qs.filter(date__lte=date_value)
+        if form_data.get('date_range'):
+            d_start, d_end = resolve_timeframe_to_dates_inclusive(now(), form_data['date_range'], self.timezone)
+            if d_start:
+                qs = qs.filter(date__gte=d_start)
+            if d_end:
+                qs = qs.filter(date__lte=d_end)
 
         jo = {
             'Format': 'NREI',
@@ -218,22 +215,14 @@ class DekodiNREIExporter(BaseExporter):
     def export_form_fields(self):
         return OrderedDict(
             [
-                ('date_from',
-                 forms.DateField(
-                     label=gettext_lazy('Start date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+                ('date_range',
+                 DateFrameField(
+                     label=gettext_lazy('Date range'),
+                     include_future_frames=False,
                      required=False,
-                     help_text=gettext_lazy('Only include invoices issued on or after this date. Note that the invoice date does '
+                     help_text=gettext_lazy('Only include invoices issued in this time frame. Note that the invoice date does '
                                             'not always correspond to the order or payment date.')
                  )),
-                ('date_to',
-                 forms.DateField(
-                     label=gettext_lazy('End date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                     required=False,
-                     help_text=gettext_lazy('Only include invoices issued on or before this date. Note that the invoice date '
-                                            'does not always correspond to the order or payment date.')
-                 )),
             ]
         )
 

src/pretix/base/exporters/events.py

@@ -35,7 +35,7 @@
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.functional import cached_property
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
 
 from ...control.forms.filter import get_all_payment_providers
 from ..exporter import ListExporter
@@ -45,6 +45,8 @@ from ..signals import register_multievent_data_exporters
 class EventDataExporter(ListExporter):
     identifier = 'eventdata'
     verbose_name = _('Event data')
+    category = pgettext_lazy('export_category', 'Event data')
+    description = _('Download a spreadsheet with information on all events in this organizer account.')
 
     @cached_property
     def providers(self):

src/pretix/base/exporters/invoices.py

@@ -38,13 +38,15 @@ from collections import OrderedDict
 from decimal import Decimal
 from zipfile import ZipFile
 
-import dateutil.parser
 from django import forms
 from django.db.models import CharField, Exists, F, OuterRef, Q, Subquery, Sum
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.functional import cached_property
-from django.utils.translation import gettext, gettext_lazy as _, pgettext
+from django.utils.timezone import now
+from django.utils.translation import (
+    gettext, gettext_lazy as _, pgettext, pgettext_lazy,
+)
 
 from pretix.base.models import Invoice, InvoiceLine, OrderPayment
 
@@ -57,30 +59,24 @@ from ..services.invoices import invoice_pdf_task
 from ..signals import (
     register_data_exporters, register_multievent_data_exporters,
 )
+from ..timeframes import DateFrameField, resolve_timeframe_to_dates_inclusive
 
 
 class InvoiceExporterMixin:
+    category = pgettext_lazy('export_category', 'Invoices')
 
     @property
     def invoice_exporter_form_fields(self):
         return OrderedDict(
             [
-                ('date_from',
-                 forms.DateField(
-                     label=_('Start date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+                ('date_range',
+                 DateFrameField(
+                     label=_('Date range'),
+                     include_future_frames=False,
                      required=False,
-                     help_text=_('Only include invoices issued on or after this date. Note that the invoice date does '
+                     help_text=_('Only include invoices issued in this time frame. Note that the invoice date does '
                                  'not always correspond to the order or payment date.')
                  )),
-                ('date_to',
-                 forms.DateField(
-                     label=_('End date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                     required=False,
-                     help_text=_('Only include invoices issued on or before this date. Note that the invoice date '
-                                 'does not always correspond to the order or payment date.')
-                 )),
                 ('payment_provider',
                  forms.ChoiceField(
                      label=_('Payment provider'),
@@ -112,16 +108,12 @@ class InvoiceExporterMixin:
                 )
             )
             qs = qs.filter(has_payment_with_provider=1)
-        if form_data.get('date_from'):
-            date_value = form_data.get('date_from')
-            if isinstance(date_value, str):
-                date_value = dateutil.parser.parse(date_value).date()
-            qs = qs.filter(date__gte=date_value)
-        if form_data.get('date_to'):
-            date_value = form_data.get('date_to')
-            if isinstance(date_value, str):
-                date_value = dateutil.parser.parse(date_value).date()
-            qs = qs.filter(date__lte=date_value)
+        if form_data.get('date_range'):
+            d_start, d_end = resolve_timeframe_to_dates_inclusive(now(), form_data['date_range'], self.timezone)
+            if d_start:
+                qs = qs.filter(date__gte=d_start)
+            if d_end:
+                qs = qs.filter(date__lte=d_end)
 
         return qs
 
@@ -129,6 +121,7 @@ class InvoiceExporterMixin:
 class InvoiceExporter(InvoiceExporterMixin, BaseExporter):
     identifier = 'invoices'
     verbose_name = _('All invoices')
+    description = _('Download all invoices created by the system as a ZIP file of PDF files.')
 
     def render(self, form_data: dict, output_file=None):
         qs = self.invoices_queryset(form_data).filter(shredded=False)
@@ -180,6 +173,10 @@ class InvoiceExporter(InvoiceExporterMixin, BaseExporter):
 class InvoiceDataExporter(InvoiceExporterMixin, MultiSheetListExporter):
     identifier = 'invoicedata'
     verbose_name = _('Invoice data')
+    description = _('Download a spreadsheet with the data of all invoices created by the system. The spreadsheet '
+                    'includes two sheets, one with a line for every invoice, and one with a line for every position of '
+                    'every invoice.')
+    featured = True
 
     @property
     def additional_form_fields(self):

src/pretix/base/exporters/items.py

@@ -22,14 +22,14 @@
 from django.db.models import Prefetch
 from django.dispatch import receiver
 from django.utils.formats import date_format
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from openpyxl.styles import Alignment
 from openpyxl.utils import get_column_letter
 
 from ...helpers.safe_openpyxl import SafeCell
 from ..channels import get_all_sales_channels
 from ..exporter import ListExporter
-from ..models import ItemMetaValue
+from ..models import ItemMetaValue, ItemVariation, ItemVariationMetaValue
 from ..signals import register_data_exporters
 
 
@@ -48,6 +48,8 @@ def _min(a1, a2):
 class ItemDataExporter(ListExporter):
     identifier = 'itemdata'
     verbose_name = _('Product data')
+    category = pgettext_lazy('export_category', 'Product data')
+    description = _('Download a spreadsheet with details about all products and variations.')
 
     def iterate_list(self, form_data):
         locales = self.event.settings.locales
@@ -73,6 +75,7 @@ class ItemDataExporter(ListExporter):
             _("Free price input"),
             _("Sales tax"),
             _("Is an admission ticket"),
+            _("Personalized ticket"),
             _("Generate tickets"),
             _("Waiting list"),
             _("Available from"),
@@ -106,18 +109,27 @@ class ItemDataExporter(ListExporter):
         yield row
 
         for i in self.event.items.prefetch_related(
-            'variations',
             Prefetch(
                 'meta_values',
                 ItemMetaValue.objects.select_related('property'),
                 to_attr='meta_values_cached'
-            )
+            ),
+            Prefetch(
+                'variations',
+                queryset=ItemVariation.objects.prefetch_related(
+                    Prefetch(
+                        'meta_values',
+                        ItemVariationMetaValue.objects.select_related('property'),
+                        to_attr='meta_values_cached'
+                    ),
+                ),
+            ),
         ).select_related('category', 'tax_rule'):
-            m = i.meta_data
             vars = list(i.variations.all())
 
             if vars:
                 for v in vars:
+                    m = v.meta_data
                     row = [
                         i.pk,
                         v.pk,
@@ -135,6 +147,7 @@ class ItemDataExporter(ListExporter):
                         _("Yes") if i.free_price else "",
                         str(i.tax_rule) if i.tax_rule else "",
                         _("Yes") if i.admission else "",
+                        _("Yes") if i.personalized else "",
                         _("Yes") if i.generate_tickets else (_("Default") if i.generate_tickets is None else ""),
                         _("Yes") if i.allow_waitinglist else "",
                         date_format(_max(i.available_from, v.available_from).astimezone(self.timezone),
@@ -160,6 +173,7 @@ class ItemDataExporter(ListExporter):
                     yield row
 
             else:
+                m = i.meta_data
                 row = [
                     i.pk,
                     "",
@@ -177,6 +191,7 @@ class ItemDataExporter(ListExporter):
                     _("Yes") if i.free_price else "",
                     str(i.tax_rule) if i.tax_rule else "",
                     _("Yes") if i.admission else "",
+                    _("Yes") if i.personalized else "",
                     _("Yes") if i.generate_tickets else (_("Default") if i.generate_tickets is None else ""),
                     _("Yes") if i.allow_waitinglist else "",
                     date_format(i.available_from.astimezone(self.timezone),

src/pretix/base/exporters/json.py

@@ -36,15 +36,22 @@ import json
 from decimal import Decimal
 
 from django.core.serializers.json import DjangoJSONEncoder
+from django.db.models import Prefetch
 from django.dispatch import receiver
+from django.utils.functional import lazy
+from django.utils.translation import gettext, gettext_lazy, pgettext_lazy
 
 from ..exporter import BaseExporter
+from ..models import ItemMetaValue, ItemVariation, ItemVariationMetaValue
 from ..signals import register_data_exporters
 
 
 class JSONExporter(BaseExporter):
     identifier = 'json'
-    verbose_name = 'Order data (JSON)'
+    verbose_name = lazy(lambda *args: gettext('Order data') + ' (JSON)', str)()
+    category = pgettext_lazy('export_category', 'Order data')
+    description = gettext_lazy('Download a structured JSON representation of all orders. This might be useful for the '
+                               'import in third-party systems.')
 
     def render(self, form_data):
         jo = {
@@ -76,6 +83,7 @@ class JSONExporter(BaseExporter):
                         'tax_rate': item.tax_rule.rate if item.tax_rule else Decimal('0.00'),
                         'tax_name': str(item.tax_rule.name) if item.tax_rule else None,
                         'admission': item.admission,
+                        'personalized': item.personalized,
                         'active': item.active,
                         'sales_channels': item.sales_channels,
                         'description': str(item.description),
@@ -106,9 +114,26 @@ class JSONExporter(BaseExporter):
                                 'available_from': variation.available_from,
                                 'available_until': variation.available_until,
                                 'hide_without_voucher': variation.hide_without_voucher,
+                                'meta_data': variation.meta_data,
                             } for variation in item.variations.all()
                         ]
-                    } for item in self.event.items.select_related('tax_rule').prefetch_related('variations')
+                    } for item in self.event.items.select_related('tax_rule').prefetch_related(
+                        Prefetch(
+                            'meta_values',
+                            ItemMetaValue.objects.select_related('property'),
+                            to_attr='meta_values_cached'
+                        ),
+                        Prefetch(
+                            'variations',
+                            queryset=ItemVariation.objects.prefetch_related(
+                                Prefetch(
+                                    'meta_values',
+                                    ItemVariationMetaValue.objects.select_related('property'),
+                                    to_attr='meta_values_cached'
+                                ),
+                            ),
+                        ),
+                    )
                 ],
                 'questions': [
                     {

src/pretix/base/exporters/mail.py

@@ -36,7 +36,7 @@ from collections import OrderedDict
 
 from django import forms
 from django.dispatch import receiver
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
 
 from pretix.base.models import OrderPosition
 
@@ -50,6 +50,8 @@ from ..signals import (
 class MailExporter(BaseExporter):
     identifier = 'mailaddrs'
     verbose_name = _('Email addresses (text file)')
+    category = pgettext_lazy('export_category', 'Order data')
+    description = _("Download a text file with all email addresses collected either from buyers or from ticket holders.")
 
     def render(self, form_data: dict):
         qs = Order.objects.filter(event__in=self.events, status__in=form_data['status']).prefetch_related('event')

src/pretix/base/exporters/orderlist.py

@@ -33,10 +33,8 @@
 # License for the specific language governing permissions and limitations under the License.
 
 from collections import OrderedDict
-from datetime import date, datetime, time
 from decimal import Decimal
 
-import dateutil
 import pytz
 from django import forms
 from django.db.models import (
@@ -46,8 +44,10 @@ from django.db.models import (
 from django.db.models.functions import Coalesce
 from django.dispatch import receiver
 from django.utils.functional import cached_property
-from django.utils.timezone import get_current_timezone, make_aware, now
-from django.utils.translation import gettext as _, gettext_lazy, pgettext
+from django.utils.timezone import get_current_timezone, now
+from django.utils.translation import (
+    gettext as _, gettext_lazy, pgettext, pgettext_lazy,
+)
 
 from pretix.base.models import (
     GiftCard, GiftCardTransaction, Invoice, InvoiceAddress, Order,
@@ -60,15 +60,27 @@ from pretix.base.settings import PERSON_NAME_SCHEMES
 from ...control.forms.filter import get_all_payment_providers
 from ...helpers import GroupConcat
 from ...helpers.iter import chunked_iterable
-from ..exporter import ListExporter, MultiSheetListExporter
+from ..exporter import (
+    ListExporter, MultiSheetListExporter, OrganizerLevelExportMixin,
+)
+from ..forms.widgets import SplitDateTimePickerWidget
 from ..signals import (
     register_data_exporters, register_multievent_data_exporters,
 )
+from ..timeframes import (
+    DateFrameField,
+    resolve_timeframe_to_datetime_start_inclusive_end_exclusive,
+)
 
 
 class OrderListExporter(MultiSheetListExporter):
     identifier = 'orderlist'
     verbose_name = gettext_lazy('Order data')
+    category = pgettext_lazy('export_category', 'Order data')
+    description = gettext_lazy('Download a spreadsheet of all orders. The spreadsheet will include three sheets, one '
+                               'with a line for every order, one with a line for every order position, and one with '
+                               'a line for every additional fee charged in an order.')
+    featured = True
 
     @cached_property
     def providers(self):
@@ -103,41 +115,25 @@ class OrderListExporter(MultiSheetListExporter):
                  initial=False,
                  required=False
              )),
-            ('date_from',
-             forms.DateField(
-                 label=_('Start date'),
-                 widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+            ('date_range',
+             DateFrameField(
+                 label=_('Date range'),
+                 include_future_frames=False,
                  required=False,
-                 help_text=_('Only include orders created on or after this date.')
+                 help_text=_('Only include orders created within this date range.')
              )),
-            ('date_to',
-             forms.DateField(
-                 label=_('End date'),
-                 widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+            ('event_date_range',
+             DateFrameField(
+                 label=_('Event date'),
+                 include_future_frames=True,
                  required=False,
-                 help_text=_('Only include orders created on or before this date.')
-             )),
-            ('event_date_from',
-             forms.DateField(
-                 label=_('Start event date'),
-                 widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                 required=False,
-                 help_text=_('Only include orders including at least one ticket for a date on or after this date. '
-                             'Will also include other dates in case of mixed orders!')
-             )),
-            ('event_date_to',
-             forms.DateField(
-                 label=_('End event date'),
-                 widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                 required=False,
-                 help_text=_('Only include orders including at least one ticket for a date on or before this date. '
+                 help_text=_('Only include orders including at least one ticket for a date in this range. '
                              'Will also include other dates in case of mixed orders!')
              )),
         ]
         d = OrderedDict(d)
         if not self.is_multievent and not self.event.has_subevents:
-            del d['event_date_from']
-            del d['event_date_to']
+            del d['event_date_range']
         return d
 
     def _get_all_payment_methods(self, qs):
@@ -180,45 +176,27 @@ class OrderListExporter(MultiSheetListExporter):
         annotations = {}
         filters = {}
 
-        if form_data.get('date_from'):
-            date_value = form_data.get('date_from')
-            if not isinstance(date_value, date):
-                date_value = dateutil.parser.parse(date_value).date()
-            datetime_value = make_aware(datetime.combine(date_value, time(0, 0, 0)), self.timezone)
+        if form_data.get('date_range'):
+            dt_start, dt_end = resolve_timeframe_to_datetime_start_inclusive_end_exclusive(now(), form_data['date_range'], self.timezone)
+            if dt_start:
+                filters[f'{rel}datetime__gte'] = dt_start
+            if dt_end:
+                filters[f'{rel}datetime__lt'] = dt_end
 
-            filters[f'{rel}datetime__gte'] = datetime_value
-
-        if form_data.get('date_to'):
-            date_value = form_data.get('date_to')
-            if not isinstance(date_value, date):
-                date_value = dateutil.parser.parse(date_value).date()
-            datetime_value = make_aware(datetime.combine(date_value, time(23, 59, 59, 999999)), self.timezone)
-
-            filters[f'{rel}datetime__lte'] = datetime_value
-
-        if form_data.get('event_date_from'):
-            date_value = form_data.get('event_date_from')
-            if not isinstance(date_value, date):
-                date_value = dateutil.parser.parse(date_value).date()
-            datetime_value = make_aware(datetime.combine(date_value, time(0, 0, 0)), self.timezone)
-
-            annotations['event_date_max'] = Case(
-                When(**{f'{rel}event__has_subevents': True}, then=Max(f'{rel}all_positions__subevent__date_from')),
-                default=F(f'{rel}event__date_from'),
-            )
-            filters['event_date_max__gte'] = datetime_value
-
-        if form_data.get('event_date_to'):
-            date_value = form_data.get('event_date_to')
-            if not isinstance(date_value, date):
-                date_value = dateutil.parser.parse(date_value).date()
-            datetime_value = make_aware(datetime.combine(date_value, time(23, 59, 59, 999999)), self.timezone)
-
-            annotations['event_date_min'] = Case(
-                When(**{f'{rel}event__has_subevents': True}, then=Min(f'{rel}all_positions__subevent__date_from')),
-                default=F(f'{rel}event__date_from'),
-            )
-            filters['event_date_min__lte'] = datetime_value
+        if form_data.get('event_date_range'):
+            dt_start, dt_end = resolve_timeframe_to_datetime_start_inclusive_end_exclusive(now(), form_data['event_date_range'], self.timezone)
+            if dt_start:
+                annotations['event_date_max'] = Case(
+                    When(**{f'{rel}event__has_subevents': True}, then=Max(f'{rel}all_positions__subevent__date_from')),
+                    default=F(f'{rel}event__date_from'),
+                )
+                filters['event_date_max__gte'] = dt_start
+            if dt_end:
+                annotations['event_date_min'] = Case(
+                    When(**{f'{rel}event__has_subevents': True}, then=Min(f'{rel}all_positions__subevent__date_from')),
+                    default=F(f'{rel}event__date_from'),
+                )
+                filters['event_date_min__lt'] = dt_end
 
         if filters:
             return qs.annotate(**annotations).filter(**filters)
@@ -301,6 +279,8 @@ class OrderListExporter(MultiSheetListExporter):
             for id, vn in payment_methods:
                 headers.append(_('Paid by {method}').format(method=vn))
 
+        # get meta_data labels from first cached event
+        headers += next(iter(self.event_object_cache.values())).meta_data.keys()
         yield headers
 
         full_fee_sum_cache = {
@@ -414,6 +394,7 @@ class OrderListExporter(MultiSheetListExporter):
                         payment_sum_cache.get((order.id, id), Decimal('0.00')) -
                         refund_sum_cache.get((order.id, id), Decimal('0.00'))
                     )
+            row += self.event_object_cache[order.event_id].meta_data.values()
             yield row
 
     def iterate_fees(self, form_data: dict):
@@ -463,6 +444,9 @@ class OrderListExporter(MultiSheetListExporter):
 
         headers.append(_('External customer ID'))
         headers.append(_('Payment providers'))
+
+        # get meta_data labels from first cached event
+        headers += next(iter(self.event_object_cache.values())).meta_data.keys()
         yield headers
 
         yield self.ProgressSetTotal(total=qs.count())
@@ -510,6 +494,7 @@ class OrderListExporter(MultiSheetListExporter):
                 str(self.providers.get(p, p)) for p in sorted(set((op.payment_providers or '').split(',')))
                 if p and p != 'free'
             ]))
+            row += self.event_object_cache[order.event_id].meta_data.values()
             yield row
 
     def iterate_positions(self, form_data: dict):
@@ -531,6 +516,7 @@ class OrderListExporter(MultiSheetListExporter):
             'order', 'order__invoice_address', 'order__customer', 'item', 'variation',
             'voucher', 'tax_rule'
         ).prefetch_related(
+            'subevent', 'subevent__meta_values',
             'answers', 'answers__question', 'answers__options'
         )
         if form_data['paid_only']:
@@ -622,6 +608,10 @@ class OrderListExporter(MultiSheetListExporter):
             _('Payment providers'),
         ]
 
+        # get meta_data labels from first cached event
+        meta_data_labels = next(iter(self.event_object_cache.values())).meta_data.keys()
+        if has_subevents:
+            headers += meta_data_labels
         yield headers
 
         all_ids = list(base_qs.order_by('order__datetime', 'positionid').values_list('pk', flat=True))
@@ -745,6 +735,12 @@ class OrderListExporter(MultiSheetListExporter):
                     str(self.providers.get(p, p)) for p in sorted(set((op.payment_providers or '').split(',')))
                     if p and p != 'free'
                 ]))
+
+                if has_subevents:
+                    if op.subevent:
+                        row += op.subevent.meta_data.values()
+                    else:
+                        row += [''] * len(meta_data_labels)
                 yield row
 
     def get_filename(self):
@@ -756,7 +752,10 @@ class OrderListExporter(MultiSheetListExporter):
 
 class PaymentListExporter(ListExporter):
     identifier = 'paymentlist'
-    verbose_name = gettext_lazy('Order payments and refunds')
+    verbose_name = gettext_lazy('Payments and refunds')
+    category = pgettext_lazy('export_category', 'Order data')
+    description = gettext_lazy('Download a spreadsheet of all payments or refunds of every order.')
+    featured = True
 
     @property
     def additional_form_fields(self):
@@ -835,6 +834,8 @@ class PaymentListExporter(ListExporter):
 class QuotaListExporter(ListExporter):
     identifier = 'quotalist'
     verbose_name = gettext_lazy('Quota availabilities')
+    category = pgettext_lazy('export_category', 'Product data')
+    description = gettext_lazy('Download a spreadsheet of all quotas including their current availability.')
 
     def iterate_list(self, form_data):
         has_subevents = self.event.has_subevents
@@ -884,81 +885,68 @@ class QuotaListExporter(ListExporter):
         return '{}_quotas'.format(self.event.slug)
 
 
-def generate_GiftCardTransactionListExporter(organizer):  # hackhack
-    class GiftcardTransactionListExporter(ListExporter):
-        identifier = 'giftcardtransactionlist'
-        verbose_name = gettext_lazy('Gift card transactions')
+class GiftcardTransactionListExporter(OrganizerLevelExportMixin, ListExporter):
+    identifier = 'giftcardtransactionlist'
+    verbose_name = gettext_lazy('Gift card transactions')
+    organizer_required_permission = 'can_manage_gift_cards'
+    category = pgettext_lazy('export_category', 'Gift cards')
+    description = gettext_lazy('Download a spreadsheet of all gift card transactions.')
 
-        @property
-        def additional_form_fields(self):
-            d = [
-                ('date_from',
-                 forms.DateField(
-                     label=_('Start date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                     required=False,
-                 )),
-                ('date_to',
-                 forms.DateField(
-                     label=_('End date'),
-                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
-                     required=False,
-                 )),
+    @property
+    def additional_form_fields(self):
+        d = [
+            ('date_range',
+             DateFrameField(
+                 label=_('Date range'),
+                 include_future_frames=False,
+                 required=False
+             )),
+        ]
+        d = OrderedDict(d)
+        return d
+
+    def iterate_list(self, form_data):
+        qs = GiftCardTransaction.objects.filter(
+            card__issuer=self.organizer,
+        ).order_by('datetime').select_related('card', 'order', 'order__event')
+
+        if form_data.get('date_range'):
+            dt_start, dt_end = resolve_timeframe_to_datetime_start_inclusive_end_exclusive(now(), form_data['date_range'], self.timezone)
+            if dt_start:
+                qs = qs.filter(datetime__gte=dt_start)
+            if dt_end:
+                qs = qs.filter(datetime__lt=dt_end)
+
+        headers = [
+            _('Gift card code'),
+            _('Test mode'),
+            _('Date'),
+            _('Amount'),
+            _('Currency'),
+            _('Order'),
+        ]
+        yield headers
+
+        for obj in qs:
+            row = [
+                obj.card.secret,
+                _('TEST MODE') if obj.card.testmode else '',
+                obj.datetime.astimezone(self.timezone).strftime('%Y-%m-%d %H:%M:%S'),
+                obj.value,
+                obj.card.currency,
+                obj.order.full_code if obj.order else None,
             ]
-            d = OrderedDict(d)
-            return d
+            yield row
 
-        def iterate_list(self, form_data):
-            qs = GiftCardTransaction.objects.filter(
-                card__issuer=organizer,
-            ).order_by('datetime').select_related('card', 'order', 'order__event')
-
-            if form_data.get('date_from'):
-                date_value = form_data.get('date_from')
-                if isinstance(date_value, str):
-                    date_value = dateutil.parser.parse(date_value).date()
-                qs = qs.filter(
-                    datetime__gte=make_aware(datetime.combine(date_value, time(0, 0, 0)), self.timezone)
-                )
-
-            if form_data.get('date_to'):
-                date_value = form_data.get('date_to')
-                if isinstance(date_value, str):
-                    date_value = dateutil.parser.parse(date_value).date()
-
-                qs = qs.filter(
-                    datetime__lte=make_aware(datetime.combine(date_value, time(23, 59, 59, 999999)), self.timezone)
-                )
-
-            headers = [
-                _('Gift card code'),
-                _('Test mode'),
-                _('Date'),
-                _('Amount'),
-                _('Currency'),
-                _('Order'),
-            ]
-            yield headers
-
-            for obj in qs:
-                row = [
-                    obj.card.secret,
-                    _('TEST MODE') if obj.card.testmode else '',
-                    obj.datetime.astimezone(self.timezone).strftime('%Y-%m-%d %H:%M:%S'),
-                    obj.value,
-                    obj.card.currency,
-                    obj.order.full_code if obj.order else None,
-                ]
-                yield row
-
-        def get_filename(self):
-            return '{}_giftcardtransactions'.format(organizer.slug)
-    return GiftcardTransactionListExporter
+    def get_filename(self):
+        return '{}_giftcardtransactions'.format(self.organizer.slug)
 
 
 class GiftcardRedemptionListExporter(ListExporter):
     identifier = 'giftcardredemptionlist'
     verbose_name = gettext_lazy('Gift card redemptions')
+    category = pgettext_lazy('export_category', 'Order data')
+    description = gettext_lazy('Download a spreadsheet of all payments or refunds that involve gift cards.')
 
     def iterate_list(self, form_data):
         payments = OrderPayment.objects.filter(
@@ -1000,114 +988,117 @@ class GiftcardRedemptionListExporter(ListExporter):
             return '{}_giftcardredemptions'.format(self.event.slug)
 
 
-def generate_GiftCardListExporter(organizer):  # hackhack
-    class GiftcardListExporter(ListExporter):
-        identifier = 'giftcardlist'
-        verbose_name = gettext_lazy('Gift cards')
+class GiftcardListExporter(OrganizerLevelExportMixin, ListExporter):
+    identifier = 'giftcardlist'
+    verbose_name = gettext_lazy('Gift cards')
+    organizer_required_permission = 'can_manage_gift_cards'
+    category = pgettext_lazy('export_category', 'Gift cards')
+    description = gettext_lazy('Download a spreadsheet of all gift cards including their current value.')
 
-        @property
-        def additional_form_fields(self):
-            return OrderedDict(
-                [
-                    ('date', forms.DateTimeField(
-                        label=_('Show value at'),
-                        initial=now(),
-                    )),
-                    ('testmode', forms.ChoiceField(
-                        label=_('Test mode'),
-                        choices=(
-                            ('', _('All')),
-                            ('yes', _('Test mode')),
-                            ('no', _('Live')),
-                        ),
-                        initial='no',
-                        required=False
-                    )),
-                    ('state', forms.ChoiceField(
-                        label=_('Status'),
-                        choices=(
-                            ('', _('All')),
-                            ('empty', _('Empty')),
-                            ('valid_value', _('Valid and with value')),
-                            ('expired_value', _('Expired and with value')),
-                            ('expired', _('Expired')),
-                        ),
-                        initial='valid_value',
-                        required=False
-                    ))
-                ]
-            )
-
-        def iterate_list(self, form_data):
-            s = GiftCardTransaction.objects.filter(
-                card=OuterRef('pk'),
-                datetime__lte=form_data['date']
-            ).order_by().values('card').annotate(s=Sum('value')).values('s')
-            qs = organizer.issued_gift_cards.filter(
-                issuance__lte=form_data['date']
-            ).annotate(
-                cached_value=Coalesce(Subquery(s), Decimal('0.00')),
-            ).order_by('issuance').prefetch_related(
-                'transactions', 'transactions__order', 'transactions__order__event', 'transactions__order__invoices'
-            )
-
-            if form_data.get('testmode') == 'yes':
-                qs = qs.filter(testmode=True)
-            elif form_data.get('testmode') == 'no':
-                qs = qs.filter(testmode=False)
-
-            if form_data.get('state') == 'empty':
-                qs = qs.filter(cached_value=0)
-            elif form_data.get('state') == 'valid_value':
-                qs = qs.exclude(cached_value=0).filter(Q(expires__isnull=True) | Q(expires__gte=form_data['date']))
-            elif form_data.get('state') == 'expired_value':
-                qs = qs.exclude(cached_value=0).filter(expires__lt=form_data['date'])
-            elif form_data.get('state') == 'expired':
-                qs = qs.filter(expires__lt=form_data['date'])
-
-            headers = [
-                _('Gift card code'),
-                _('Test mode card'),
-                _('Creation date'),
-                _('Expiry date'),
-                _('Special terms and conditions'),
-                _('Currency'),
-                _('Current value'),
-                _('Created in order'),
-                _('Last invoice number of order'),
-                _('Last invoice date of order'),
+    @property
+    def additional_form_fields(self):
+        return OrderedDict(
+            [
+                ('date', forms.SplitDateTimeField(
+                    label=_('Show value at'),
+                    required=False,
+                    widget=SplitDateTimePickerWidget(),
+                    help_text=_('Defaults to the time of report.')
+                )),
+                ('testmode', forms.ChoiceField(
+                    label=_('Test mode'),
+                    choices=(
+                        ('', _('All')),
+                        ('yes', _('Test mode')),
+                        ('no', _('Live')),
+                    ),
+                    initial='no',
+                    required=False
+                )),
+                ('state', forms.ChoiceField(
+                    label=_('Status'),
+                    choices=(
+                        ('', _('All')),
+                        ('empty', _('Empty')),
+                        ('valid_value', _('Valid and with value')),
+                        ('expired_value', _('Expired and with value')),
+                        ('expired', _('Expired')),
+                    ),
+                    initial='valid_value',
+                    required=False
+                ))
             ]
-            yield headers
+        )
 
-            tz = get_current_timezone()
-            for obj in qs:
-                o = None
-                i = None
-                trans = list(obj.transactions.all())
-                if trans:
-                    o = trans[0].order
-                if o:
-                    invs = list(o.invoices.all())
-                    if invs:
-                        i = invs[-1]
-                row = [
-                    obj.secret,
-                    _('Yes') if obj.testmode else _('No'),
-                    obj.issuance.astimezone(tz).date().strftime('%Y-%m-%d'),
-                    obj.expires.astimezone(tz).date().strftime('%Y-%m-%d') if obj.expires else '',
-                    obj.conditions or '',
-                    obj.currency,
-                    obj.cached_value,
-                    o.full_code if o else '',
-                    i.number if i else '',
-                    i.date.strftime('%Y-%m-%d') if i else '',
-                ]
-                yield row
+    def iterate_list(self, form_data):
+        d = form_data.get('date') or now()
+        s = GiftCardTransaction.objects.filter(
+            card=OuterRef('pk'),
+            datetime__lte=d
+        ).order_by().values('card').annotate(s=Sum('value')).values('s')
+        qs = self.organizer.issued_gift_cards.filter(
+            issuance__lte=d
+        ).annotate(
+            cached_value=Coalesce(Subquery(s), Decimal('0.00')),
+        ).order_by('issuance').prefetch_related(
+            'transactions', 'transactions__order', 'transactions__order__event', 'transactions__order__invoices'
+        )
 
-        def get_filename(self):
-            return '{}_giftcards'.format(organizer.slug)
+        if form_data.get('testmode') == 'yes':
+            qs = qs.filter(testmode=True)
+        elif form_data.get('testmode') == 'no':
+            qs = qs.filter(testmode=False)
 
-    return GiftcardListExporter
+        if form_data.get('state') == 'empty':
+            qs = qs.filter(cached_value=0)
+        elif form_data.get('state') == 'valid_value':
+            qs = qs.exclude(cached_value=0).filter(Q(expires__isnull=True) | Q(expires__gte=d))
+        elif form_data.get('state') == 'expired_value':
+            qs = qs.exclude(cached_value=0).filter(expires__lt=d)
+        elif form_data.get('state') == 'expired':
+            qs = qs.filter(expires__lt=d)
+
+        headers = [
+            _('Gift card code'),
+            _('Test mode card'),
+            _('Creation date'),
+            _('Expiry date'),
+            _('Special terms and conditions'),
+            _('Currency'),
+            _('Current value'),
+            _('Created in order'),
+            _('Last invoice number of order'),
+            _('Last invoice date of order'),
+        ]
+        yield headers
+
+        tz = get_current_timezone()
+        for obj in qs:
+            o = None
+            i = None
+            trans = list(obj.transactions.all())
+            if trans:
+                o = trans[0].order
+            if o:
+                invs = list(o.invoices.all())
+                if invs:
+                    i = invs[-1]
+            row = [
+                obj.secret,
+                _('Yes') if obj.testmode else _('No'),
+                obj.issuance.astimezone(tz).date().strftime('%Y-%m-%d'),
+                obj.expires.astimezone(tz).date().strftime('%Y-%m-%d') if obj.expires else '',
+                obj.conditions or '',
+                obj.currency,
+                obj.cached_value,
+                o.full_code if o else '',
+                i.number if i else '',
+                i.date.strftime('%Y-%m-%d') if i else '',
+            ]
+            yield row
+
+    def get_filename(self):
+        return '{}_giftcards'.format(self.organizer.slug)
 
 
 @receiver(register_data_exporters, dispatch_uid="exporter_orderlist")
@@ -1147,9 +1138,9 @@ def register_multievent_i_giftcardredemptionlist_exporter(sender, **kwargs):
 
 @receiver(register_multievent_data_exporters, dispatch_uid="multiexporter_giftcardlist")
 def register_multievent_i_giftcardlist_exporter(sender, **kwargs):
-    return generate_GiftCardListExporter(sender)
+    return GiftcardListExporter
 
 
 @receiver(register_multievent_data_exporters, dispatch_uid="multiexporter_giftcardtransactionlist")
 def register_multievent_i_giftcardtransactionlist_exporter(sender, **kwargs):
-    return generate_GiftCardTransactionListExporter(sender)
+    return GiftcardTransactionListExporter

src/pretix/base/exporters/waitinglist.py

@@ -39,6 +39,8 @@ from ..signals import (
 class WaitingListExporter(ListExporter):
     identifier = 'waitinglist'
     verbose_name = _('Waiting list')
+    category = pgettext_lazy('export_category', 'Waiting list')
+    description = _('Download a spread sheet with all your waiting list data.')
 
     # map selected status to label and queryset-filter
     status_filters = [

src/pretix/base/forms/questions.py

@@ -135,6 +135,10 @@ class NamePartsWidget(forms.MultiWidget):
             data.append(value.get(fname, ""))
         if '_legacy' in value and not data[-1]:
             data[-1] = value.get('_legacy', '')
+        elif not any(d for d in data) and '_scheme' in value:
+            scheme = PERSON_NAME_SCHEMES[value['_scheme']]
+            data[-1] = scheme['concatenation'](value).strip()
+
         return data
 
     def render(self, name: str, value, attrs=None, renderer=None) -> str:
@@ -527,7 +531,7 @@ class PortraitImageField(SizeValidationMixin, ExtValidationMixin, forms.FileFiel
                     code='aspect_ratio_not_3_by_4',
                 )
         except Exception as exc:
-            logger.exception('foo')
+            logger.exception('Could not parse image')
             # Pillow doesn't recognize it as an image.
             if isinstance(exc, ValidationError):
                 raise
@@ -571,7 +575,7 @@ class BaseQuestionsForm(forms.Form):
 
         add_fields = {}
 
-        if item.admission and event.settings.attendee_names_asked:
+        if item.ask_attendee_data and event.settings.attendee_names_asked:
             add_fields['attendee_name_parts'] = NamePartsFormField(
                 max_length=255,
                 required=event.settings.attendee_names_required and not self.all_optional,
@@ -580,7 +584,7 @@ class BaseQuestionsForm(forms.Form):
                 label=_('Attendee name'),
                 initial=(cartpos.attendee_name_parts if cartpos else orderpos.attendee_name_parts),
             )
-        if item.admission and event.settings.attendee_emails_asked:
+        if item.ask_attendee_data and event.settings.attendee_emails_asked:
             add_fields['attendee_email'] = forms.EmailField(
                 required=event.settings.attendee_emails_required and not self.all_optional,
                 label=_('Attendee email'),
@@ -591,7 +595,7 @@ class BaseQuestionsForm(forms.Form):
                     }
                 )
             )
-        if item.admission and event.settings.attendee_company_asked:
+        if item.ask_attendee_data and event.settings.attendee_company_asked:
             add_fields['company'] = forms.CharField(
                 required=event.settings.attendee_company_required and not self.all_optional,
                 label=_('Company'),
@@ -599,7 +603,7 @@ class BaseQuestionsForm(forms.Form):
                 initial=(cartpos.company if cartpos else orderpos.company),
             )
 
-        if item.admission and event.settings.attendee_addresses_asked:
+        if item.ask_attendee_data and event.settings.attendee_addresses_asked:
             add_fields['street'] = forms.CharField(
                 required=event.settings.attendee_addresses_required and not self.all_optional,
                 label=_('Address'),
@@ -915,6 +919,7 @@ class BaseQuestionsForm(forms.Form):
 
 class BaseInvoiceAddressForm(forms.ModelForm):
     vat_warning = False
+    address_validation = False
 
     class Meta:
         model = InvoiceAddress
@@ -1050,6 +1055,9 @@ class BaseInvoiceAddressForm(forms.ModelForm):
                 v.widget.attrs['autocomplete'] = 'section-invoice billing ' + v.widget.attrs.get('autocomplete', '')
 
     def clean(self):
+        from pretix.base.addressvalidation import \
+            validate_address  # local import to prevent impact on startup time
+
         data = self.cleaned_data
         if not data.get('is_business'):
             data['company'] = ''
@@ -1065,9 +1073,8 @@ class BaseInvoiceAddressForm(forms.ModelForm):
         if 'vat_id' in self.changed_data or not data.get('vat_id'):
             self.instance.vat_id_validated = False
 
-        if data.get('city') and data.get('country') and str(data['country']) in COUNTRIES_WITH_STATE_IN_ADDRESS:
-            if not data.get('state'):
-                self.add_error('state', _('This field is required.'))
+        if self.address_validation:
+            self.cleaned_data = data = validate_address(data, self.all_optional)
 
         self.instance.name_parts = data.get('name_parts')
 

src/pretix/base/invoice.py

@@ -23,6 +23,7 @@ import logging
 from collections import defaultdict
 from decimal import Decimal
 from io import BytesIO
+from itertools import groupby
 from typing import Tuple
 
 import bleach
@@ -241,6 +242,12 @@ class BaseReportlabInvoiceRenderer(BaseInvoiceRenderer):
         buffer.seek(0)
         return 'invoice.pdf', 'application/pdf', buffer.read()
 
+    def _clean_text(self, text, tags=None):
+        return bleach.clean(
+            text,
+            tags=tags or []
+        ).strip().replace('<br>', '<br />').replace('\n', '<br />\n')
+
 
 class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
     identifier = 'classic'
@@ -265,7 +272,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
     invoice_to_top = 52 * mm
 
     def _draw_invoice_to(self, canvas):
-        p = Paragraph(bleach.clean(self.invoice.address_invoice_to, tags=[]).strip().replace('\n', '<br />\n'),
+        p = Paragraph(self._clean_text(self.invoice.address_invoice_to),
                       style=self.stylesheet['Normal'])
         p.wrapOn(canvas, self.invoice_to_width, self.invoice_to_height)
         p_size = p.wrap(self.invoice_to_width, self.invoice_to_height)
@@ -278,7 +285,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
 
     def _draw_invoice_from(self, canvas):
         p = Paragraph(
-            bleach.clean(self.invoice.full_invoice_from, tags=[]).strip().replace('\n', '<br />\n'),
+            self._clean_text(self.invoice.full_invoice_from),
             style=self.stylesheet['InvoiceFrom']
         )
         p.wrapOn(canvas, self.invoice_from_width, self.invoice_from_height)
@@ -473,8 +480,8 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         if self.invoice.custom_field:
             story.append(Paragraph(
                 '{}: {}'.format(
-                    bleach.clean(str(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._clean_text(str(self.invoice.event.settings.invoice_address_custom_field)),
+                    self._clean_text(self.invoice.custom_field),
                 ),
                 self.stylesheet['Normal']
             ))
@@ -482,7 +489,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         if self.invoice.internal_reference:
             story.append(Paragraph(
                 pgettext('invoice', 'Customer reference: {reference}').format(
-                    reference=bleach.clean(self.invoice.internal_reference, tags=[]).strip().replace('\n', '<br />\n'),
+                    reference=self._clean_text(self.invoice.internal_reference),
                 ),
                 self.stylesheet['Normal']
             ))
@@ -490,20 +497,20 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         if self.invoice.invoice_to_vat_id:
             story.append(Paragraph(
                 pgettext('invoice', 'Customer VAT ID') + ': ' +
-                bleach.clean(self.invoice.invoice_to_vat_id, tags=[]).replace("\n", "<br />\n"),
+                self._clean_text(self.invoice.invoice_to_vat_id),
                 self.stylesheet['Normal']
             ))
 
         if self.invoice.invoice_to_beneficiary:
             story.append(Paragraph(
                 pgettext('invoice', 'Beneficiary') + ':<br />' +
-                bleach.clean(self.invoice.invoice_to_beneficiary, tags=[]).replace("\n", "<br />\n"),
+                self._clean_text(self.invoice.invoice_to_beneficiary),
                 self.stylesheet['Normal']
             ))
 
         if self.invoice.introductory_text:
             story.append(Paragraph(
-                self.invoice.introductory_text,
+                self._clean_text(self.invoice.introductory_text, tags=['br']),
                 self.stylesheet['Normal']
             ))
             story.append(Spacer(1, 10 * mm))
@@ -554,31 +561,47 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
                 pgettext('invoice', 'Amount'),
             )]
 
+        def _group_key(line):
+            return (line.description, line.tax_rate, line.tax_name, line.net_value, line.gross_value, line.subevent_id,
+                    line.event_date_from, line.event_date_to)
+
         total = Decimal('0.00')
-        for line in self.invoice.lines.all():
+        for (description, tax_rate, tax_name, net_value, gross_value, *ignored), lines in groupby(self.invoice.lines.all(), key=_group_key):
+            lines = list(lines)
             if has_taxes:
+                if len(lines) > 1:
+                    single_price_line = pgettext('invoice', 'Single price: {net_price} net / {gross_price} gross').format(
+                        net_price=money_filter(net_value, self.invoice.event.currency),
+                        gross_price=money_filter(gross_value, self.invoice.event.currency),
+                    )
+                    description = description + "\n" + single_price_line
                 tdata.append((
                     Paragraph(
-                        bleach.clean(line.description, tags=['br']).strip().replace('<br>', '<br/>').replace('\n', '<br />\n'),
+                        self._clean_text(description, tags=['br']),
                         self.stylesheet['Normal']
                     ),
-                    "1",
-                    localize(line.tax_rate) + " %",
-                    money_filter(line.net_value, self.invoice.event.currency),
-                    money_filter(line.gross_value, self.invoice.event.currency),
+                    str(len(lines)),
+                    localize(tax_rate) + " %",
+                    money_filter(net_value * len(lines), self.invoice.event.currency),
+                    money_filter(gross_value * len(lines), self.invoice.event.currency),
                 ))
             else:
+                if len(lines) > 1:
+                    single_price_line = pgettext('invoice', 'Single price: {price}').format(
+                        price=money_filter(gross_value, self.invoice.event.currency),
+                    )
+                    description = description + "\n" + single_price_line
                 tdata.append((
                     Paragraph(
-                        bleach.clean(line.description, tags=['br']).strip().replace('<br>', '<br/>').replace('\n', '<br />\n'),
+                        self._clean_text(description, tags=['br']),
                         self.stylesheet['Normal']
                     ),
-                    "1",
-                    money_filter(line.gross_value, self.invoice.event.currency),
+                    str(len(lines)),
+                    money_filter(gross_value * len(lines), self.invoice.event.currency),
                 ))
-            taxvalue_map[line.tax_rate, line.tax_name] += line.tax_value
-            grossvalue_map[line.tax_rate, line.tax_name] += line.gross_value
-            total += line.gross_value
+            taxvalue_map[tax_rate, tax_name] += (gross_value - net_value) * len(lines)
+            grossvalue_map[tax_rate, tax_name] += gross_value * len(lines)
+            total += gross_value * len(lines)
 
         if has_taxes:
             tdata.append([
@@ -640,7 +663,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
 
         if self.invoice.additional_text:
             story.append(Paragraph(
-                self.invoice.additional_text,
+                self._clean_text(self.invoice.additional_text, tags=['br']),
                 self.stylesheet['Normal']
             ))
             story.append(Spacer(1, 5 * mm))
@@ -777,7 +800,7 @@ class Modern1Renderer(ClassicInvoiceRenderer):
         if not self.invoice.invoice_from:
             return
         c = [
-            bleach.clean(l, tags=[]).strip().replace('\n', '<br />\n')
+            self._clean_text(l)
             for l in self.invoice.address_invoice_from.strip().split('\n')
         ]
         p = Paragraph(' · '.join(c), style=self.stylesheet['Sender'])

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

@@ -103,6 +103,8 @@ class Command(BaseCommand):
 
             with language(locale), override(timezone):
                 for receiver, response in signal_result:
+                    if not response:
+                        return None
                     ex = response(e, o, report_status)
                     if ex.identifier == options['export_provider']:
                         params = json.loads(options.get('parameters') or '{}')

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

@@ -79,9 +79,9 @@ class Command(BaseCommand):
                 if settings.SENTRY_ENABLED:
                     from sentry_sdk import capture_exception
                     capture_exception(err)
-                    self.stdout.write(self.style.ERROR(f'ERROR runperiodic {str(err)}\n'))
+                    self.stdout.write(self.style.ERROR(f'ERROR {name}: {str(err)}\n'))
                 else:
-                    self.stdout.write(self.style.ERROR(f'ERROR runperiodic {str(err)}\n'))
+                    self.stdout.write(self.style.ERROR(f'ERROR {name}: {str(err)}\n'))
                     traceback.print_exc()
             else:
                 if options.get('verbosity') > 1:

src/pretix/base/middleware.py

@@ -30,7 +30,6 @@ from django.urls import get_script_prefix
 from django.utils import timezone, translation
 from django.utils.cache import patch_vary_headers
 from django.utils.deprecation import MiddlewareMixin
-from django.utils.translation import LANGUAGE_SESSION_KEY
 from django.utils.translation.trans_real import (
     check_for_language, get_supported_language_variant, language_code_re,
     parse_accept_lang_header,
@@ -128,12 +127,7 @@ def get_language_from_user_settings(request: HttpRequest) -> str:
             return lang_code
 
 
-def get_language_from_session_or_cookie(request: HttpRequest) -> str:
-    if hasattr(request, 'session'):
-        lang_code = request.session.get(LANGUAGE_SESSION_KEY)
-        if lang_code in _supported and lang_code is not None and check_for_language(lang_code):
-            return lang_code
-
+def get_language_from_cookie(request: HttpRequest) -> str:
     lang_code = request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME)
     try:
         return get_supported_language_variant(lang_code)
@@ -187,14 +181,14 @@ def get_language_from_request(request: HttpRequest) -> str:
         return (
             get_language_from_user_settings(request)
             or get_language_from_customer_settings(request)
-            or get_language_from_session_or_cookie(request)
+            or get_language_from_cookie(request)
             or get_language_from_browser(request)
             or get_language_from_event(request)
             or get_default_language()
         )
     else:
         return (
-            get_language_from_session_or_cookie(request)
+            get_language_from_cookie(request)
             or get_language_from_customer_settings(request)
             or get_language_from_user_settings(request)
             or get_language_from_browser(request)
@@ -224,6 +218,11 @@ def _merge_csp(a, b):
         if k not in a:
             a[k] = b[k]
 
+    for k, v in a.items():
+        if "'unsafe-inline'" in v:
+            # If we need unsafe-inline, drop any hashes or nonce as they will be ignored otherwise
+            a[k] = [i for i in v if not i.startswith("'nonce-") and not i.startswith("'sha-")]
+
 
 class SecurityMiddleware(MiddlewareMixin):
     CSP_EXEMPT = (
@@ -301,7 +300,7 @@ class SecurityMiddleware(MiddlewareMixin):
             resp['Content-Security-Policy'] = _render_csp(h).format(static=staticdomain, dynamic=dynamicdomain,
                                                                     media=mediadomain)
             for k, v in h.items():
-                h[k] = ' '.join(v).format(static=staticdomain, dynamic=dynamicdomain, media=mediadomain).split(' ')
+                h[k] = sorted(set(' '.join(v).format(static=staticdomain, dynamic=dynamicdomain, media=mediadomain).split(' ')))
             resp['Content-Security-Policy'] = _render_csp(h)
         elif 'Content-Security-Policy' in resp:
             del resp['Content-Security-Policy']

src/pretix/base/migrations/0223_voucher_min_usages.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2022-10-12 09:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0222_alter_question_unique_together'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='voucher',
+            name='min_usages',
+            field=models.PositiveIntegerField(default=1),
+        ),
+    ]

src/pretix/base/migrations/0224_eventmetaproperty_filter_allowed.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.16 on 2022-11-14 11:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0223_voucher_min_usages'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='eventmetaproperty',
+            name='filter_allowed',
+            field=models.BooleanField(default=True),
+        ),
+    ]

src/pretix/base/migrations/0225_orderpayment_process_initiated.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.16 on 2022-11-17 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0224_eventmetaproperty_filter_allowed'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='orderpayment',
+            name='process_initiated',
+            field=models.BooleanField(null=True),
+        ),
+    ]

src/pretix/base/migrations/0226_itemvariationmetavalue.py

@@ -0,0 +1,29 @@
+# Generated by Django 3.2.16 on 2022-12-09 10:06
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+import pretix.base.models.base
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0225_orderpayment_process_initiated'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ItemVariationMetaValue',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('value', models.TextField()),
+                ('property', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='variation_values', to='pretixbase.itemmetaproperty')),
+                ('variation', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='meta_values', to='pretixbase.itemvariation')),
+            ],
+            options={
+                'unique_together': {('variation', 'property')},
+            },
+            bases=(models.Model, pretix.base.models.base.LoggingMixin),
+        ),
+    ]

src/pretix/base/migrations/0227_item_personalized.py

@@ -0,0 +1,27 @@
+# Generated by Django 3.2.16 on 2022-12-21 08:59
+
+from django.db import migrations, models
+
+
+def item_set_personalized(apps, schema_editor):
+    # We cannot really know if a position was bundled or an add-on, but we can at least guess
+    Item = apps.get_model("pretixbase", "Item")
+    Item.objects.filter(admission=True).update(personalized=True)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('pretixbase', '0226_itemvariationmetavalue'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='item',
+            name='personalized',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.RunPython(
+            item_set_personalized,
+            migrations.RunPython.noop,
+        ),
+    ]

src/pretix/base/migrations/0228_scheduledeventexport_scheduledorganizerexport.py

@@ -0,0 +1,68 @@
+# Generated by Django 3.2.16 on 2023-01-18 11:57
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+import pretix.base.models.base
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0227_item_personalized'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ScheduledOrganizerExport',
+            fields=[
+                ('id', models.BigAutoField(primary_key=True, serialize=False)),
+                ('export_identifier', models.CharField(max_length=190)),
+                ('export_form_data', models.JSONField(default=dict)),
+                ('locale', models.CharField(max_length=250)),
+                ('mail_additional_recipients', models.TextField()),
+                ('mail_additional_recipients_cc', models.TextField()),
+                ('mail_additional_recipients_bcc', models.TextField()),
+                ('mail_subject', models.CharField(max_length=250)),
+                ('mail_template', models.TextField()),
+                ('schedule_rrule', models.TextField(null=True)),
+                ('schedule_rrule_time', models.TimeField()),
+                ('schedule_next_run', models.DateTimeField(blank=True, null=True)),
+                ('error_counter', models.IntegerField(default=0)),
+                ('error_last_message', models.TextField(null=True)),
+                ('timezone', models.CharField(default='UTC', max_length=100)),
+                ('organizer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='scheduled_exports', to='pretixbase.organizer')),
+                ('owner', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model, pretix.base.models.base.LoggingMixin),
+        ),
+        migrations.CreateModel(
+            name='ScheduledEventExport',
+            fields=[
+                ('id', models.BigAutoField(primary_key=True, serialize=False)),
+                ('export_identifier', models.CharField(max_length=190)),
+                ('export_form_data', models.JSONField(default=dict)),
+                ('locale', models.CharField(max_length=250)),
+                ('mail_additional_recipients', models.TextField()),
+                ('mail_additional_recipients_cc', models.TextField()),
+                ('mail_additional_recipients_bcc', models.TextField()),
+                ('mail_subject', models.CharField(max_length=250)),
+                ('mail_template', models.TextField()),
+                ('schedule_rrule', models.TextField(null=True)),
+                ('schedule_rrule_time', models.TimeField()),
+                ('schedule_next_run', models.DateTimeField(blank=True, null=True)),
+                ('error_counter', models.IntegerField(default=0)),
+                ('error_last_message', models.TextField(null=True)),
+                ('event', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='scheduled_exports', to='pretixbase.event')),
+                ('owner', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model, pretix.base.models.base.LoggingMixin),
+        ),
+    ]

src/pretix/base/models/__init__.py

@@ -30,12 +30,13 @@ from .event import (
     Event, Event_SettingsStore, EventLock, EventMetaProperty, EventMetaValue,
     SubEvent, SubEventMetaValue, generate_invite_token,
 )
+from .exports import ScheduledEventExport, ScheduledOrganizerExport
 from .giftcards import GiftCard, GiftCardAcceptance, GiftCardTransaction
 from .invoices import Invoice, InvoiceLine, invoice_filename
 from .items import (
     Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaProperty, ItemMetaValue,
-    ItemVariation, Question, QuestionOption, Quota, SubEventItem,
-    SubEventItemVariation, itempicture_upload_to,
+    ItemVariation, ItemVariationMetaValue, Question, QuestionOption, Quota,
+    SubEventItem, SubEventItemVariation, itempicture_upload_to,
 )
 from .log import LogEntry
 from .memberships import Membership, MembershipType

src/pretix/base/models/checkin.py

@@ -36,13 +36,17 @@ from datetime import timedelta
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.db import models
-from django.db.models import Exists, F, Max, OuterRef, Q, Subquery
+from django.db.models import (
+    Count, Exists, F, Max, OuterRef, Q, Subquery, Value, Window,
+)
+from django.db.models.expressions import RawSQL
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_scopes import ScopedManager, scopes_disabled
 
 from pretix.base.models import LoggedModel
 from pretix.base.models.fields import MultiStringField
+from pretix.helpers import PostgresWindowFrame
 
 
 class CheckinList(LoggedModel):
@@ -95,15 +99,18 @@ class CheckinList(LoggedModel):
     class Meta:
         ordering = ('subevent__date_from', 'name')
 
-    @property
-    def positions(self):
+    def positions_query(self, ignore_status=False):
         from . import Order, OrderPosition
 
-        qs = OrderPosition.objects.filter(
+        qs = OrderPosition.all.filter(
             order__event=self.event,
-            order__status__in=[Order.STATUS_PAID, Order.STATUS_PENDING] if self.include_pending else [
-                Order.STATUS_PAID],
         )
+        if not ignore_status:
+            qs = qs.filter(
+                canceled=False,
+                order__status__in=[Order.STATUS_PAID, Order.STATUS_PENDING] if self.include_pending else [Order.STATUS_PAID],
+            )
+
         if self.subevent_id:
             qs = qs.filter(subevent_id=self.subevent_id)
         if not self.all_products:
@@ -111,36 +118,90 @@ class CheckinList(LoggedModel):
         return qs
 
     @property
-    def positions_inside(self):
-        return self.positions.annotate(
-            last_entry=Subquery(
-                Checkin.objects.filter(
-                    position_id=OuterRef('pk'),
-                    list_id=self.pk,
-                    type=Checkin.TYPE_ENTRY,
-                ).order_by().values('position_id').annotate(
-                    m=Max('datetime')
-                ).values('m')
-            ),
-            last_exit=Subquery(
-                Checkin.objects.filter(
-                    position_id=OuterRef('pk'),
-                    list_id=self.pk,
-                    type=Checkin.TYPE_EXIT,
-                ).order_by().values('position_id').annotate(
-                    m=Max('datetime')
-                ).values('m')
-            ),
-        ).filter(
-            Q(last_entry__isnull=False)
-            & Q(
-                Q(last_exit__isnull=True) | Q(last_exit__lt=F('last_entry'))
+    def positions(self):
+        return self.positions_query(ignore_status=False)
+
+    @scopes_disabled()
+    def positions_inside_query(self, ignore_status=False, at_time=None):
+        if at_time is None:
+            c_q = []
+        else:
+            c_q = [Q(datetime__lt=at_time)]
+
+        if "postgresql" not in settings.DATABASES["default"]["ENGINE"]:
+            # Use a simple approach that works on all databases
+            qs = self.positions_query(ignore_status=ignore_status).annotate(
+                last_entry=Subquery(
+                    Checkin.objects.filter(
+                        *c_q,
+                        position_id=OuterRef('pk'),
+                        list_id=self.pk,
+                        type=Checkin.TYPE_ENTRY,
+                    ).order_by().values('position_id').annotate(
+                        m=Max('datetime')
+                    ).values('m')
+                ),
+                last_exit=Subquery(
+                    Checkin.objects.filter(
+                        *c_q,
+                        position_id=OuterRef('pk'),
+                        list_id=self.pk,
+                        type=Checkin.TYPE_EXIT,
+                    ).order_by().values('position_id').annotate(
+                        m=Max('datetime')
+                    ).values('m')
+                ),
+            ).filter(
+                Q(last_entry__isnull=False)
+                & Q(
+                    Q(last_exit__isnull=True) | Q(last_exit__lt=F('last_entry'))
+                )
+            )
+            return qs
+
+        # Use the PostgreSQL-specific query using Window functions, which is a lot faster.
+        # On a real-world example with ~100k tickets, of which ~17k are checked in, we observed
+        # a speed-up from 29s (old) to a few hundred milliseconds (new)!
+        # Why is this so much faster? The regular query get's PostgreSQL all busy with filtering
+        # the tickets both by their belonging the event and checkin status at the same time, while
+        # this query just iterates over all successful checkins on the list, and -- by the power
+        # of window functions -- asks "is this an entry that is followed by no exit?". Then we
+        # dedupliate by position and count it up.
+        cl = self
+        base_q, base_params = (
+            Checkin.all.filter(*c_q, successful=True, list=cl)
+            .annotate(
+                cnt_exists_after=Window(
+                    expression=Count("position_id", filter=Q(type=Value("exit"))),
+                    partition_by=[F("position_id"), F("list_id")],
+                    order_by=F("datetime").asc(),
+                    frame=PostgresWindowFrame(
+                        "ROWS", start="1 following", end="unbounded following"
+                    ),
+                )
+            )
+            .values("position_id", "type", "datetime", "cnt_exists_after")
+            .query.sql_with_params()
+        )
+        return self.positions_query(ignore_status=ignore_status).filter(
+            pk__in=RawSQL(
+                f"""
+                SELECT "position_id"
+                FROM ({str(base_q)}) s
+                WHERE "type" = %s AND "cnt_exists_after" = 0
+                GROUP BY "position_id"
+                """,
+                [*base_params, Checkin.TYPE_ENTRY]
             )
         )
 
+    @property
+    def positions_inside(self):
+        return self.positions_inside_query(None)
+
     @property
     def inside_count(self):
-        return self.positions_inside.count()
+        return self.positions_inside_query(None).count()
 
     @property
     @scopes_disabled()

src/pretix/base/models/customers.py

@@ -78,6 +78,7 @@ class Customer(LoggedModel):
     organizer = models.ForeignKey(Organizer, related_name='customers', on_delete=models.CASCADE)
     provider = models.ForeignKey(CustomerSSOProvider, related_name='customers', on_delete=models.PROTECT, null=True, blank=True)
     identifier = models.CharField(
+        verbose_name=_('Customer ID'),
         max_length=190,
         db_index=True,
         help_text=_('You can enter any value here to make it easier to match the data with other sources. If you do '
@@ -261,7 +262,7 @@ class Customer(LoggedModel):
         ) + '?id=' + self.identifier + '&token=' + token
         mail(
             self.email,
-            _('Activate your account at {organizer}').format(organizer=self.organizer.name),
+            self.organizer.settings.mail_subject_customer_registration,
             self.organizer.settings.mail_text_customer_registration,
             ctx,
             locale=self.locale,

src/pretix/base/models/discount.py

@@ -28,6 +28,7 @@ from typing import Dict, Optional, Tuple
 from django.core.exceptions import ValidationError
 from django.core.validators import MinValueValidator
 from django.db import models
+from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_scopes import ScopedManager
 
@@ -198,6 +199,14 @@ class Discount(LoggedModel):
             'subevent_mode': self.subevent_mode,
         })
 
+    def is_available_by_time(self, now_dt=None) -> bool:
+        now_dt = now_dt or now()
+        if self.available_from and self.available_from > now_dt:
+            return False
+        if self.available_until and self.available_until < now_dt:
+            return False
+        return True
+
     def _apply_min_value(self, positions, idx_group, result):
         if self.condition_min_value and sum(positions[idx][2] for idx in idx_group) < self.condition_min_value:
             return

src/pretix/base/models/event.py

@@ -374,7 +374,7 @@ class EventMixin:
                 if q.active_items:
                     items_reserved.update(q.active_items.split(","))
                 if q.active_variations:
-                    vars_available.update(q.active_variations.split(","))
+                    vars_reserved.update(q.active_variations.split(","))
             elif res[0] < Quota.AVAILABILITY_RESERVED:
                 if q.active_items:
                     items_gone.update(q.active_items.split(","))
@@ -590,6 +590,7 @@ class Event(EventMixin, LoggedModel):
         self.settings.event_list_type = 'calendar'
         self.settings.invoice_email_attachment = True
         self.settings.name_scheme = 'given_family'
+        self.settings.payment_banktransfer_invoice_immediately = True
 
     @property
     def social_image(self):
@@ -631,6 +632,7 @@ class Event(EventMixin, LoggedModel):
             return super().presale_has_ended
 
     def delete_all_orders(self, really=False):
+        from .checkin import Checkin
         from .orders import (
             OrderFee, OrderPayment, OrderPosition, OrderRefund, Transaction,
         )
@@ -644,6 +646,7 @@ class Event(EventMixin, LoggedModel):
         OrderFee.objects.filter(order__event=self).delete()
         OrderRefund.objects.filter(order__event=self).delete()
         OrderPayment.objects.filter(order__event=self).delete()
+        Checkin.objects.filter(list__event=self).delete()
         self.orders.all().delete()
 
     def save(self, *args, **kwargs):
@@ -727,7 +730,7 @@ class Event(EventMixin, LoggedModel):
         from ..signals import event_copy_data
         from . import (
             Discount, Item, ItemAddOn, ItemBundle, ItemCategory, ItemMetaValue,
-            Question, Quota,
+            ItemVariationMetaValue, Question, Quota,
         )
 
         #  Note: avoid self.set_active_plugins(), it causes trouble e.g. for the badges plugin.
@@ -803,12 +806,18 @@ class Event(EventMixin, LoggedModel):
                 v.item = i
                 v.save(force_insert=True)
 
-        for imv in ItemMetaValue.objects.filter(item__event=other).prefetch_related('item', 'property'):
+        for imv in ItemMetaValue.objects.filter(item__event=other):
             imv.pk = None
-            imv.property = item_meta_properties_map[imv.property.pk]
+            imv.property = item_meta_properties_map[imv.property_id]
             imv.item = item_map[imv.item.pk]
             imv.save(force_insert=True)
 
+        for imv in ItemVariationMetaValue.objects.filter(variation__item__event=other):
+            imv.pk = None
+            imv.property = item_meta_properties_map[imv.property_id]
+            imv.variation = variation_map[imv.variation_id]
+            imv.save(force_insert=True)
+
         for ia in ItemAddOn.objects.filter(base_item__event=other).prefetch_related('base_item', 'addon_category'):
             ia.pk = None
             ia.base_item = item_map[ia.base_item.pk]
@@ -1579,6 +1588,11 @@ class EventMetaProperty(LoggedModel):
         verbose_name=_("Valid values"),
         help_text=_("If you keep this empty, any value is allowed. Otherwise, enter one possible value per line.")
     )
+    filter_allowed = models.BooleanField(
+        default=True, verbose_name=_("Can be used for filtering"),
+        help_text=_("This field will be shown to filter events or reports in the backend, and it can also be used "
+                    "for hidden filter parameters in the frontend (e.g. using the widget).")
+    )
 
     def full_clean(self, exclude=None, validate_unique=True):
         super().full_clean(exclude, validate_unique)

src/pretix/base/models/exports.py

@@ -0,0 +1,139 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from datetime import datetime, timedelta
+
+import pytz
+from dateutil.rrule import rrulestr
+from django.conf import settings
+from django.core.serializers.json import DjangoJSONEncoder
+from django.db import models
+from django.utils.timezone import make_aware, now
+from django.utils.translation import gettext_lazy as _
+
+from pretix.base.models import LoggedModel
+from pretix.base.validators import RRuleValidator, multimail_validate
+
+
+class AbstractScheduledExport(LoggedModel):
+    id = models.BigAutoField(primary_key=True)
+
+    export_identifier = models.CharField(
+        max_length=190,
+        verbose_name=_("Export"),
+    )
+    export_form_data = models.JSONField(
+        default=dict,
+        encoder=DjangoJSONEncoder,
+    )
+
+    owner = models.ForeignKey(
+        "pretixbase.User",
+        on_delete=models.PROTECT,
+    )
+    locale = models.CharField(
+        verbose_name=_('Language'),
+        max_length=250
+    )
+
+    mail_additional_recipients = models.TextField(
+        verbose_name=_('Additional recipients'),
+        null=False, blank=True, validators=[multimail_validate],
+        help_text=_("You can specify multiple recipients separated by commas.")
+    )
+    mail_additional_recipients_cc = models.TextField(
+        verbose_name=_('Additional recipients (Cc)'),
+        null=False, blank=True, validators=[multimail_validate],
+        help_text=_("You can specify multiple recipients separated by commas.")
+    )
+    mail_additional_recipients_bcc = models.TextField(
+        verbose_name=_('Additional recipients (Bcc)'),
+        null=False, blank=True, validators=[multimail_validate],
+        help_text=_("You can specify multiple recipients separated by commas.")
+    )
+    mail_subject = models.CharField(
+        verbose_name=_('Subject'),
+        max_length=250
+    )
+    mail_template = models.TextField(
+        verbose_name=_('Message'),
+    )
+
+    schedule_rrule = models.TextField(
+        null=True, blank=True, validators=[RRuleValidator()]
+    )
+    schedule_rrule_time = models.TimeField(
+        verbose_name=_("Requested start time"),
+        help_text=_("The actual start time might be delayed depending on system load."),
+    )
+    schedule_next_run = models.DateTimeField(null=True, blank=True)
+
+    error_counter = models.IntegerField(default=0)
+    error_last_message = models.TextField(null=True, blank=True)
+
+    class Meta:
+        abstract = True
+
+    def __str__(self):
+        return self.mail_subject
+
+    def compute_next_run(self):
+        tz = self.tz
+        r = rrulestr(self.schedule_rrule)
+
+        base_dt = now().astimezone(tz).replace(tzinfo=None)
+        if now().astimezone(tz).time() < self.schedule_rrule_time:
+            base_dt -= timedelta(days=1)
+
+        new_d = r.after(base_dt, inc=False)
+        if not new_d:
+            self.schedule_next_run = None
+            return
+
+        try:
+            self.schedule_next_run = make_aware(datetime.combine(new_d.date(), self.schedule_rrule_time), tz)
+        except pytz.exceptions.AmbiguousTimeError:
+            self.schedule_next_run = make_aware(datetime.combine(new_d.date(), self.schedule_rrule_time), tz, is_dst=False)
+        except pytz.exceptions.NonExistentTimeError:
+            self.schedule_next_run = make_aware(datetime.combine(new_d.date(), self.schedule_rrule_time) + timedelta(hours=1), tz)
+
+
+class ScheduledEventExport(AbstractScheduledExport):
+    event = models.ForeignKey(
+        "pretixbase.Event", on_delete=models.CASCADE, related_name="scheduled_exports"
+    )
+
+    @property
+    def tz(self):
+        return self.event.timezone
+
+
+class ScheduledOrganizerExport(AbstractScheduledExport):
+    organizer = models.ForeignKey(
+        "pretixbase.Organizer", on_delete=models.CASCADE, related_name="scheduled_exports"
+    )
+    timezone = models.CharField(max_length=100,
+                                default=settings.TIME_ZONE,
+                                verbose_name=_('Timezone'))
+
+    @property
+    def tz(self):
+        return pytz.timezone(self.timezone)

src/pretix/base/models/items.py

@@ -62,6 +62,7 @@ from pretix.base.models.base import LoggedModel
 from pretix.base.models.fields import MultiStringField
 from pretix.base.models.tax import TaxedPrice
 
+from ...helpers.images import ImageSizeValidator
 from .event import Event, SubEvent
 
 
@@ -310,6 +311,8 @@ class Item(LoggedModel):
     :type tax_rate: decimal.Decimal
     :param admission: ``True``, if this item allows persons to enter the event (as opposed to e.g. merchandise)
     :type admission: bool
+    :param personalized: ``True``, if attendee information should be collected for this ticket
+    :type personalized: bool
     :param picture: A product picture to be shown next to the product description
     :type picture: File
     :param available_from: The date this product goes on sale
@@ -396,8 +399,14 @@ class Item(LoggedModel):
     admission = models.BooleanField(
         verbose_name=_("Is an admission ticket"),
         help_text=_(
-            'Whether or not buying this product allows a person to enter '
-            'your event'
+            'Whether or not buying this product allows a person to enter your event'
+        ),
+        default=False
+    )
+    personalized = models.BooleanField(
+        verbose_name=_("Is a personalized ticket"),
+        help_text=_(
+            'Whether or not buying this product allows to enter attendee information'
         ),
         default=False
     )
@@ -421,7 +430,8 @@ class Item(LoggedModel):
     picture = models.ImageField(
         verbose_name=_("Product picture"),
         null=True, blank=True, max_length=255,
-        upload_to=itempicture_upload_to
+        upload_to=itempicture_upload_to,
+        validators=[ImageSizeValidator()]
     )
     available_from = models.DateTimeField(
         verbose_name=_("Available from"),
@@ -578,21 +588,22 @@ class Item(LoggedModel):
             return self.event.settings.show_quota_left
         return self.show_quota_left
 
+    @property
+    def ask_attendee_data(self):
+        return self.admission and self.personalized
+
     def tax(self, price=None, base_price_is='auto', currency=None, invoice_address=None, override_tax_rate=None, include_bundled=False):
         price = price if price is not None else self.default_price
 
-        if not self.tax_rule:
-            t = TaxedPrice(gross=price, net=price, tax=Decimal('0.00'),
-                           rate=Decimal('0.00'), name='')
-        else:
-            t = self.tax_rule.tax(price, base_price_is=base_price_is, invoice_address=invoice_address,
-                                  override_tax_rate=override_tax_rate, currency=currency or self.event.currency)
-
+        bundled_sum = Decimal('0.00')
+        bundled_sum_net = Decimal('0.00')
+        bundled_sum_tax = Decimal('0.00')
         if include_bundled:
             for b in self.bundles.all():
                 if b.designated_price and b.bundled_item.tax_rule_id != self.tax_rule_id:
                     if b.bundled_variation:
-                        bprice = b.bundled_variation.tax(b.designated_price * b.count, base_price_is='gross',
+                        bprice = b.bundled_variation.tax(b.designated_price * b.count,
+                                                         base_price_is='gross',
                                                          invoice_address=invoice_address,
                                                          currency=currency)
                     else:
@@ -600,17 +611,23 @@ class Item(LoggedModel):
                                                     invoice_address=invoice_address,
                                                     base_price_is='gross',
                                                     currency=currency)
-                    if not self.tax_rule:
-                        compare_price = TaxedPrice(gross=b.designated_price * b.count, net=b.designated_price * b.count,
-                                                   tax=Decimal('0.00'), rate=Decimal('0.00'), name='')
-                    else:
-                        compare_price = self.tax_rule.tax(b.designated_price * b.count,
-                                                          override_tax_rate=override_tax_rate,
-                                                          invoice_address=invoice_address,
-                                                          currency=currency)
-                    t.net += bprice.net - compare_price.net
-                    t.tax += bprice.tax - compare_price.tax
-                    t.name = "MIXED!"
+                    bundled_sum += bprice.gross
+                    bundled_sum_net += bprice.net
+                    bundled_sum_tax += bprice.tax
+
+        if not self.tax_rule:
+            t = TaxedPrice(gross=price - bundled_sum, net=price - bundled_sum, tax=Decimal('0.00'),
+                           rate=Decimal('0.00'), name='')
+        else:
+            t = self.tax_rule.tax(price, base_price_is=base_price_is, invoice_address=invoice_address,
+                                  override_tax_rate=override_tax_rate, currency=currency or self.event.currency,
+                                  subtract_from_gross=bundled_sum)
+
+        if bundled_sum:
+            t.name = "MIXED!"
+            t.gross += bundled_sum
+            t.net += bundled_sum_net
+            t.tax += bundled_sum_tax
 
         return t
 
@@ -1005,6 +1022,16 @@ class ItemVariation(models.Model):
             return False
         return True
 
+    @property
+    def meta_data(self):
+        data = self.item.meta_data
+        if hasattr(self, 'meta_values_cached'):
+            data.update({v.property.name: v.value for v in self.meta_values_cached})
+        else:
+            data.update({v.property.name: v.value for v in self.meta_values.select_related('property').all()})
+
+        return OrderedDict((k, v) for k, v in sorted(data.items(), key=lambda k: k[0]))
+
 
 class ItemAddOn(models.Model):
     """
@@ -1381,8 +1408,10 @@ class Question(LoggedModel):
         if self.type == Question.TYPE_CHOICE:
             if isinstance(answer, QuestionOption):
                 return answer
+            if not isinstance(answer, (int, str)):
+                raise ValidationError(_('Invalid input type.'))
             q = Q(identifier=answer)
-            if isinstance(answer, int) or answer.isdigit():
+            if isinstance(answer, int) or (isinstance(answer, str) and answer.isdigit()):
                 q |= Q(pk=answer)
             o = self.options.filter(q).first()
             if not o:
@@ -1782,8 +1811,21 @@ class ItemMetaValue(LoggedModel):
     class Meta:
         unique_together = ('item', 'property')
 
-    def delete(self, *args, **kwargs):
-        super().delete(*args, **kwargs)
 
-    def save(self, *args, **kwargs):
-        super().save(*args, **kwargs)
+class ItemVariationMetaValue(LoggedModel):
+    """
+    A meta-data value assigned to an item variation, overriding the value on the item.
+
+    :param variation: The variation this metadata is valid for
+    :type variation: ItemVariation
+    :param property: The property this value belongs to
+    :type property: ItemMetaProperty
+    :param value: The actual value
+    :type value: str
+    """
+    variation = models.ForeignKey('ItemVariation', on_delete=models.CASCADE, related_name='meta_values')
+    property = models.ForeignKey('ItemMetaProperty', on_delete=models.CASCADE, related_name='variation_values')
+    value = models.TextField()
+
+    class Meta:
+        unique_together = ('variation', 'property')

src/pretix/base/models/orders.py

@@ -79,7 +79,9 @@ from pretix.base.services.locking import LOCK_TIMEOUT, NoLockManager
 from pretix.base.settings import PERSON_NAME_SCHEMES
 from pretix.base.signals import order_gracefully_delete
 
+from ...helpers import OF_SELF
 from ...helpers.countries import CachedCountries, FastCountryField
+from ...helpers.format import format_map
 from ._transactions import (
     _fail, _transactions_mark_order_clean, _transactions_mark_order_dirty,
 )
@@ -564,17 +566,30 @@ class Order(LockModel, LoggedModel):
     @cached_property
     def user_cancel_fee(self):
         fee = Decimal('0.00')
-        if self.event.settings.cancel_allow_user_paid_keep_fees:
-            fee += self.fees.filter(
-                fee_type__in=(OrderFee.FEE_TYPE_PAYMENT, OrderFee.FEE_TYPE_SHIPPING, OrderFee.FEE_TYPE_SERVICE,
-                              OrderFee.FEE_TYPE_CANCELLATION)
-            ).aggregate(
-                s=Sum('value')
-            )['s'] or 0
-        if self.event.settings.cancel_allow_user_paid_keep_percentage:
-            fee += self.event.settings.cancel_allow_user_paid_keep_percentage / Decimal('100.0') * (self.total - fee)
-        if self.event.settings.cancel_allow_user_paid_keep:
-            fee += self.event.settings.cancel_allow_user_paid_keep
+        if self.status == Order.STATUS_PAID:
+            if self.event.settings.cancel_allow_user_paid_keep_fees:
+                fee += self.fees.filter(
+                    fee_type__in=(OrderFee.FEE_TYPE_PAYMENT, OrderFee.FEE_TYPE_SHIPPING, OrderFee.FEE_TYPE_SERVICE,
+                                  OrderFee.FEE_TYPE_CANCELLATION)
+                ).aggregate(
+                    s=Sum('value')
+                )['s'] or 0
+            if self.event.settings.cancel_allow_user_paid_keep_percentage:
+                fee += self.event.settings.cancel_allow_user_paid_keep_percentage / Decimal('100.0') * (self.total - fee)
+            if self.event.settings.cancel_allow_user_paid_keep:
+                fee += self.event.settings.cancel_allow_user_paid_keep
+        else:
+            if self.event.settings.cancel_allow_user_unpaid_keep_fees:
+                fee += self.fees.filter(
+                    fee_type__in=(OrderFee.FEE_TYPE_PAYMENT, OrderFee.FEE_TYPE_SHIPPING, OrderFee.FEE_TYPE_SERVICE,
+                                  OrderFee.FEE_TYPE_CANCELLATION)
+                ).aggregate(
+                    s=Sum('value')
+                )['s'] or 0
+            if self.event.settings.cancel_allow_user_unpaid_keep_percentage:
+                fee += self.event.settings.cancel_allow_user_unpaid_keep_percentage / Decimal('100.0') * (self.total - fee)
+            if self.event.settings.cancel_allow_user_unpaid_keep:
+                fee += self.event.settings.cancel_allow_user_unpaid_keep
         return round_decimal(min(fee, self.total), self.event.currency)
 
     @property
@@ -642,10 +657,12 @@ class Order(LockModel, LoggedModel):
         if self.user_cancel_deadline and now() > self.user_cancel_deadline:
             return False
 
-        if self.status == Order.STATUS_PAID or self.payment_refund_sum > Decimal('0.00'):
+        if self.status == Order.STATUS_PAID:
             if self.total == Decimal('0.00'):
                 return self.event.settings.cancel_allow_user
             return self.event.settings.cancel_allow_user_paid
+        elif self.payment_refund_sum > Decimal('0.00'):
+            return False
         elif self.status == Order.STATUS_PENDING:
             return self.event.settings.cancel_allow_user
         return False
@@ -792,7 +809,7 @@ class Order(LockModel, LoggedModel):
             return True
         ask_names = self.event.settings.get('attendee_names_asked', as_type=bool)
         for cp in positions:
-            if (cp.item.admission and ask_names) or cp.item.questions.all():
+            if (cp.item.ask_attendee_data and ask_names) or cp.item.questions.all():
                 return True
 
         return False  # nothing there to modify
@@ -981,7 +998,7 @@ class Order(LockModel, LoggedModel):
                          position and the attendee email will be used if available.
         """
         from pretix.base.services.mail import (
-            SendMailException, TolerantDict, mail, render_mail,
+            SendMailException, mail, render_mail,
         )
 
         if not self.email and not (position and position.attendee_email):
@@ -997,7 +1014,7 @@ class Order(LockModel, LoggedModel):
 
             try:
                 email_content = render_mail(template, context)
-                subject = str(subject).format_map(TolerantDict(context))
+                subject = format_map(subject, context)
                 mail(
                     recipient, subject, template, context,
                     self.event, self.locale, self, headers=headers, sender=sender,
@@ -1027,7 +1044,7 @@ class Order(LockModel, LoggedModel):
         with language(self.locale, self.event.settings.region):
             email_template = self.event.settings.mail_text_resend_link
             email_context = get_email_context(event=self.event, order=self)
-            email_subject = _('Your order: %(code)s') % {'code': self.code}
+            email_subject = self.event.settings.mail_subject_resend_link
             self.send_mail(
                 email_subject, email_template, email_context,
                 'pretix.event.order.email.resend', user=user, auth=auth,
@@ -1494,6 +1511,9 @@ class OrderPayment(models.Model):
     :type info: str
     :param fee: The ``OrderFee`` object used to track the fee for this order.
     :type fee: pretix.base.models.OrderFee
+    :param process_initiated: Only for internal use inside pretix.presale to check which payments have started
+                              the execution process.
+    :type process_initiated: bool
     """
     PAYMENT_STATE_CREATED = 'created'
     PAYMENT_STATE_PENDING = 'pending'
@@ -1544,6 +1564,9 @@ class OrderPayment(models.Model):
         null=True, blank=True, related_name='payments', on_delete=models.SET_NULL
     )
     migrated = models.BooleanField(default=False)
+    process_initiated = models.BooleanField(
+        null=True  # null = created before this field was introduced
+    )
 
     objects = ScopedManager(organizer='order__event__organizer')
 
@@ -1606,7 +1629,7 @@ class OrderPayment(models.Model):
         been marked as paid.
         """
         with transaction.atomic():
-            locked_instance = OrderPayment.objects.select_for_update().get(pk=self.pk)
+            locked_instance = OrderPayment.objects.select_for_update(of=OF_SELF).get(pk=self.pk)
             if locked_instance.state not in (OrderPayment.PAYMENT_STATE_CREATED, OrderPayment.PAYMENT_STATE_PENDING):
                 # Race condition detected, this payment is already confirmed
                 logger.info('Failed payment {} but ignored due to likely race condition.'.format(
@@ -1630,7 +1653,7 @@ class OrderPayment(models.Model):
         }, user=user, auth=auth)
 
     def confirm(self, count_waitinglist=True, send_mail=True, force=False, user=None, auth=None, mail_text='',
-                ignore_date=False, lock=True, payment_date=None):
+                ignore_date=False, lock=True, payment_date=None, generate_invoice=True):
         """
         Marks the payment as complete. If possible, this also marks the order as paid if no further
         payment is required
@@ -1651,7 +1674,7 @@ class OrderPayment(models.Model):
         :raises Quota.QuotaExceededException: if the quota is exceeded and ``force`` is ``False``
         """
         with transaction.atomic():
-            locked_instance = OrderPayment.objects.select_for_update().get(pk=self.pk)
+            locked_instance = OrderPayment.objects.select_for_update(of=OF_SELF).get(pk=self.pk)
             if locked_instance.state == self.PAYMENT_STATE_CONFIRMED:
                 # Race condition detected, this payment is already confirmed
                 logger.info('Confirmed payment {} but ignored due to likely race condition.'.format(
@@ -1693,10 +1716,11 @@ class OrderPayment(models.Model):
             ))
             return
 
-        self._mark_order_paid(count_waitinglist, send_mail, force, user, auth, mail_text, ignore_date, lock, payment_sum - refund_sum)
+        self._mark_order_paid(count_waitinglist, send_mail, force, user, auth, mail_text, ignore_date, lock, payment_sum - refund_sum,
+                              generate_invoice)
 
     def _mark_order_paid(self, count_waitinglist=True, send_mail=True, force=False, user=None, auth=None, mail_text='',
-                         ignore_date=False, lock=True, payment_refund_sum=0):
+                         ignore_date=False, lock=True, payment_refund_sum=0, allow_generate_invoice=True):
         from pretix.base.services.invoices import (
             generate_invoice, invoice_qualified,
         )
@@ -1713,7 +1737,7 @@ class OrderPayment(models.Model):
                                   ignore_date=ignore_date)
 
         invoice = None
-        if invoice_qualified(self.order):
+        if invoice_qualified(self.order) and allow_generate_invoice:
             invoices = self.order.invoices.filter(is_cancellation=False).count()
             cancellations = self.order.invoices.filter(is_cancellation=True).count()
             gen_invoice = (
@@ -1738,8 +1762,8 @@ class OrderPayment(models.Model):
 
         with language(self.order.locale, self.order.event.settings.region):
             email_template = self.order.event.settings.mail_text_order_paid_attendee
+            email_subject = self.order.event.settings.mail_subject_order_paid_attendee
             email_context = get_email_context(event=self.order.event, order=self.order, position=position)
-            email_subject = _('Event registration confirmed: %(code)s') % {'code': self.order.code}
             try:
                 position.send_mail(
                     email_subject, email_template, email_context,
@@ -1756,8 +1780,8 @@ class OrderPayment(models.Model):
 
         with language(self.order.locale, self.order.event.settings.region):
             email_template = self.order.event.settings.mail_text_order_paid
+            email_subject = self.order.event.settings.mail_subject_order_paid
             email_context = get_email_context(event=self.order.event, order=self.order, payment_info=mail_text)
-            email_subject = _('Payment received for your order: %(code)s') % {'code': self.order.code}
             try:
                 self.order.send_mail(
                     email_subject, email_template, email_context,
@@ -2237,7 +2261,7 @@ class OrderPosition(AbstractPosition):
 
     @cached_property
     def sort_key(self):
-        return self.addon_to.positionid if self.addon_to else self.positionid, self.addon_to_id or 0
+        return self.addon_to.positionid if self.addon_to else self.positionid, self.addon_to_id or 0, self.positionid
 
     @property
     def checkins(self):
@@ -2263,7 +2287,7 @@ class OrderPosition(AbstractPosition):
         ops = []
         cp_mapping = {}
         # The sorting key ensures that all addons come directly after the position they refer to
-        for i, cartpos in enumerate(sorted(cp, key=lambda c: (c.addon_to_id or c.pk, c.addon_to_id or 0))):
+        for i, cartpos in enumerate(sorted(cp, key=lambda c: c.sort_key)):
             op = OrderPosition(order=order)
             for f in AbstractPosition._meta.fields:
                 if f.name == 'addon_to':
@@ -2392,7 +2416,7 @@ class OrderPosition(AbstractPosition):
         :param attach_ical: Attach relevant ICS files
         """
         from pretix.base.services.mail import (
-            SendMailException, TolerantDict, mail, render_mail,
+            SendMailException, mail, render_mail,
         )
 
         if not self.attendee_email:
@@ -2405,7 +2429,7 @@ class OrderPosition(AbstractPosition):
             recipient = self.attendee_email
             try:
                 email_content = render_mail(template, context)
-                subject = str(subject).format_map(TolerantDict(context))
+                subject = format_map(subject, context)
                 mail(
                     recipient, subject, template, context,
                     self.event, self.order.locale, order=self.order, headers=headers, sender=sender,
@@ -2437,7 +2461,7 @@ class OrderPosition(AbstractPosition):
         with language(self.order.locale, self.order.event.settings.region):
             email_template = self.event.settings.mail_text_resend_link
             email_context = get_email_context(event=self.order.event, order=self.order, position=self)
-            email_subject = _('Your event registration: %(code)s') % {'code': self.order.code}
+            email_subject = self.event.settings.mail_subject_resend_link
             self.send_mail(
                 email_subject, email_template, email_context,
                 'pretix.event.order.email.resend', user=user, auth=auth,
@@ -2659,6 +2683,20 @@ class CartPosition(AbstractPosition):
                             self.event.currency)
         return self.price - net
 
+    @cached_property
+    def sort_key(self):
+        subevent_key = (self.subevent.date_from, str(self.subevent.name), self.subevent_id) if self.subevent_id else (0, "", 0)
+        category_key = (self.item.category.position, self.item.category.id) if self.item.category_id is not None else (0, 0)
+        item_key = self.item.position, self.item_id
+        variation_key = (self.variation.position, self.variation.id) if self.variation_id is not None else (0, 0)
+        line_key = (self.price, (self.voucher_id or 0), (self.seat.sorting_rank if self.seat_id else 0), self.pk)
+        sort_key = subevent_key + category_key + item_key + variation_key + line_key
+
+        if self.addon_to_id:
+            return self.addon_to.sort_key + (1 if self.is_bundled else 2,) + sort_key
+        else:
+            return sort_key
+
     def update_listed_price_and_voucher(self, voucher_only=False, max_discount=None):
         from pretix.base.services.pricing import (
             get_listed_price, is_included_for_free,
@@ -2708,12 +2746,18 @@ class CartPosition(AbstractPosition):
             tax_rule=self.item.tax_rule,
             invoice_address=invoice_address,
             bundled_sum=sum([b.price_after_voucher for b in bundled_positions]),
+            is_bundled=self.is_bundled,
         )
         if line_price.gross != self.line_price_gross or line_price.rate != self.tax_rate:
             self.line_price_gross = line_price.gross
             self.tax_rate = line_price.rate
             self.save(update_fields=['line_price_gross', 'tax_rate'])
 
+    @property
+    def addons_without_bundled(self):
+        addons = [op for op in self.addons.all() if not op.is_bundled]
+        return sorted(addons, key=lambda cp: cp.sort_key)
+
 
 class InvoiceAddress(models.Model):
     last_modified = models.DateTimeField(auto_now=True)

src/pretix/base/models/tax.py

@@ -23,6 +23,7 @@ import json
 from decimal import Decimal
 
 from django.core.exceptions import ValidationError
+from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models
 from django.utils.formats import localize
 from django.utils.translation import gettext_lazy as _, pgettext
@@ -149,7 +150,15 @@ class TaxRule(LoggedModel):
     rate = models.DecimalField(
         max_digits=10,
         decimal_places=2,
-        verbose_name=_("Tax rate")
+        validators=[
+            MaxValueValidator(
+                limit_value=Decimal("100.00"),
+            ),
+            MinValueValidator(
+                limit_value=Decimal("0.00"),
+            ),
+        ],
+        verbose_name=_("Tax rate"),
     )
     price_includes_tax = models.BooleanField(
         verbose_name=_("The configured product prices include the tax amount"),

src/pretix/base/models/vouchers.py

@@ -137,6 +137,8 @@ class Voucher(LoggedModel):
     :type max_usages: int
     :param redeemed: The number of times this voucher already has been redeemed
     :type redeemed: int
+    :param min_usages: The minimum number of times this voucher must be redeemed
+    :type min_usages: int
     :param valid_until: The expiration date of this voucher (optional)
     :type valid_until: datetime
     :param block_quota: If set to true, this voucher will reserve quota for its holder
@@ -199,6 +201,14 @@ class Voucher(LoggedModel):
         verbose_name=_("Redeemed"),
         default=0
     )
+    min_usages = models.PositiveIntegerField(
+        verbose_name=_("Minimum usages"),
+        help_text=_("If set to more than one, the voucher must be redeemed for this many products when it is used for "
+                    "the first time. On later usages, it can also be used for lower numbers of products. Note that "
+                    "this means that the total number of usages in some cases can be lower than this limit, e.g. in "
+                    "case of cancellations."),
+        default=1
+    )
     budget = models.DecimalField(
         verbose_name=_("Maximum discount budget"),
         help_text=_("This is the maximum monetary amount that will be discounted using this voucher across all usages. "
@@ -350,6 +360,10 @@ class Voucher(LoggedModel):
                     'redeemed': redeemed
                 }
             )
+        if data.get('max_usages', 1) < data.get('min_usages', 1):
+            raise ValidationError(
+                _('The maximum number of usages may not be lower than the minimum number of usages.'),
+            )
 
     @staticmethod
     def clean_subevent(data, event):
@@ -464,7 +478,7 @@ class Voucher(LoggedModel):
         if quota:
             raise ValidationError(_('You need to choose a specific product if you select a seat.'))
 
-        if data.get('max_usages', 1) > 1:
+        if data.get('max_usages', 1) > 1 or data.get('min_usages', 1) > 1:
             raise ValidationError(_('Seat-specific vouchers can only be used once.'))
 
         if item and seat.product != item:
@@ -567,6 +581,10 @@ class Voucher(LoggedModel):
         else:
             return bool(subevent.seating_plan) if subevent else self.event.seating_plan
 
+    @property
+    def min_usages_remaining(self):
+        return max(1, self.min_usages - self.redeemed)
+
     @classmethod
     def annotate_budget_used_orders(cls, qs):
         opq = OrderPosition.objects.filter(

src/pretix/base/models/waitinglist.py

@@ -20,6 +20,7 @@
 # <https://www.gnu.org/licenses/>.
 #
 from datetime import timedelta
+from typing import Any, Dict, Union
 
 from django.core.exceptions import ObjectDoesNotExist, ValidationError
 from django.db import models, transaction
@@ -27,14 +28,16 @@ from django.db.models import F, Q, Sum
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from django_scopes import ScopedManager
+from i18nfield.strings import LazyI18nString
 from phonenumber_field.modelfields import PhoneNumberField
 
 from pretix.base.email import get_email_context
 from pretix.base.i18n import language
-from pretix.base.models import Voucher
-from pretix.base.services.mail import mail
+from pretix.base.models import User, Voucher
+from pretix.base.services.mail import SendMailException, mail, render_mail
 from pretix.base.settings import PERSON_NAME_SCHEMES
 
+from ...helpers.format import format_map
 from .base import LoggedModel
 from .event import Event, SubEvent
 from .items import Item, ItemVariation
@@ -213,15 +216,74 @@ class WaitingListEntry(LoggedModel):
             self.voucher = v
             self.save()
 
+        self.send_mail(
+            self.event.settings.mail_subject_waiting_list,
+            self.event.settings.mail_text_waiting_list,
+            get_email_context(
+                event=self.event,
+                waiting_list_entry=self,
+                waiting_list_voucher=v,
+                event_or_subevent=self.subevent or self.event,
+            ),
+            user=user,
+            auth=auth,
+        )
+
+    def send_mail(self, subject: Union[str, LazyI18nString], template: Union[str, LazyI18nString],
+                  context: Dict[str, Any]=None, log_entry_type: str='pretix.waitinglist.email.sent',
+                  user: User=None, headers: dict=None, sender: str=None, auth=None, auto_email=True,
+                  attach_other_files: list=None, attach_cached_files: list=None):
+        """
+        Sends an email to the entry's contact address.
+
+        * Call ``pretix.base.services.mail.mail`` with useful values for the ``event``, ``locale``, and ``recipient``
+          parameters.
+
+        * Create a ``LogEntry`` with the email contents.
+
+        :param subject: Subject of the email
+        :param template: LazyI18nString or template filename, see ``pretix.base.services.mail.mail`` for more details
+        :param context: Dictionary to use for rendering the template
+        :param log_entry_type: Key to be used for the log entry
+        :param user: Administrative user who triggered this mail to be sent
+        :param headers: Dictionary with additional mail headers
+        :param sender: Custom email sender.
+        """
+        if not self.email:
+            return
+
+        for k, v in self.event.meta_data.items():
+            context['meta_' + k] = v
+
         with language(self.locale, self.event.settings.region):
-            mail(
-                self.email,
-                _('You have been selected from the waitinglist for {event}').format(event=str(self.event)),
-                self.event.settings.mail_text_waiting_list,
-                get_email_context(event=self.event, waiting_list_entry=self),
-                self.event,
-                locale=self.locale
-            )
+            recipient = self.email
+
+            try:
+                email_content = render_mail(template, context)
+                subject = format_map(subject, context)
+                mail(
+                    recipient, subject, template, context,
+                    self.event,
+                    self.locale,
+                    headers=headers,
+                    sender=sender,
+                    auto_email=auto_email,
+                    attach_other_files=attach_other_files,
+                    attach_cached_files=attach_cached_files,
+                )
+            except SendMailException:
+                raise
+            else:
+                self.log_action(
+                    log_entry_type,
+                    user=user,
+                    auth=auth,
+                    data={
+                        'subject': subject,
+                        'message': email_content,
+                        'recipient': recipient,
+                    }
+                )
 
     @staticmethod
     def clean_itemvar(event, item, variation):