Bump to 2.8.0

Update from Weblate

.travis.yml

@@ -1,4 +1,5 @@
 language: python
+dist: xenial
 sudo: false
 install:
   - pip install -U pip wheel setuptools
@@ -12,23 +13,23 @@ services:
   - postgresql
 matrix:
   include:
-    - python: 3.6
+    - python: 3.7
       env: JOB=tests PRETIX_CONFIG_FILE=tests/travis_sqlite.cfg
-    - python: 3.6
+    - python: 3.7
       env: JOB=tests-cov PRETIX_CONFIG_FILE=tests/travis_postgres.cfg
-    - python: 3.6
+    - python: 3.7
       env: JOB=style
-    - python: 3.6
+    - python: 3.7
       env: JOB=tests PRETIX_CONFIG_FILE=tests/travis_mysql.cfg
-    - python: 3.6
+    - python: 3.7
       env: JOB=tests PRETIX_CONFIG_FILE=tests/travis_postgres.cfg
     - python: 3.5
       env: JOB=tests PRETIX_CONFIG_FILE=tests/travis_postgres.cfg
-    - python: 3.6
+    - python: 3.7
       env: JOB=plugins
-    - python: 3.6
+    - python: 3.7
       env: JOB=doc-spelling
-    - python: 3.6
+    - python: 3.7
       env: JOB=translation-spelling
 addons:
   postgresql: "9.4"

doc/admin/config.rst

@@ -125,6 +125,8 @@ Example::
     Indicates if the database backend is a MySQL/MariaDB Galera cluster and
     turns on some optimizations/special case handlers. Default: ``False``
 
+.. _`config-replica`:
+
 Database replica settings
 -------------------------
 
@@ -142,6 +144,8 @@ Example::
     [replica]
     host=192.168.0.2
 
+.. _`config-urls`:
+
 URLs
 ----
 
@@ -269,6 +273,24 @@ to speed up various operations::
 If redis is not configured, pretix will store sessions and locks in the database. If memcached
 is configured, memcached will be used for caching instead of redis.
 
+Translations
+------------
+
+pretix comes with a number of translations. Some of them are marked as "incubating", which means
+they can usually only be selected in development mode. If you want to use them nevertheless, you
+can activate them like this::
+
+    [languages]
+    allow_incubating=pt-br,da
+
+You can also tell pretix about additional paths where it will search for translations::
+
+    [languages]
+    path=/path/to/my/translations
+
+For a given language (e.g. ``pt-br``), pretix will then look in the
+specific sub-folder, e.g. ``/path/to/my/translations/pt_BR/LC_MESSAGES/django.po``.
+
 Celery task queue
 -----------------
 

doc/admin/index.rst

@@ -11,3 +11,4 @@ This documentation is for everyone who wants to install pretix on a server.
    installation/index
    config
    maintainance
+   scaling

doc/admin/installation/index.rst

@@ -1,3 +1,5 @@
+.. _`installation`:
+
 Installation guide
 ==================
 

doc/admin/installation/manual_smallscale.rst

@@ -68,10 +68,6 @@ To build and run pretix, you will need the following debian packages::
                       python3-dev libxml2-dev libxslt1-dev libffi-dev zlib1g-dev libssl-dev \
                       gettext libpq-dev libmariadbclient-dev libjpeg-dev libopenjp2-7-dev
 
-.. note:: Python 3.7 is not yet supported, so if you run a very recent OS, make sure to get
-          Python 3.6 from somewhere. You can check the current state of things in our
-          `Python 3.7 issue`_.
-
 Config file
 -----------
 
@@ -314,4 +310,3 @@ example::
 .. _redis: https://blog.programster.org/debian-8-install-redis-server/
 .. _ufw: https://en.wikipedia.org/wiki/Uncomplicated_Firewall
 .. _strong encryption settings: https://mozilla.github.io/server-side-tls/ssl-config-generator/
-.. _Python 3.7 issue: https://github.com/pretix/pretix/issues/1025

doc/admin/scaling.rst

@@ -0,0 +1,236 @@
+.. _`scaling`:
+
+Scaling guide
+=============
+
+Our :ref:`installation guide <installation>` only covers "small-scale" setups, by which we mostly mean
+setups that run on a **single (virtual) machine** and do not encounter large traffic peaks.
+
+We do not offer an installation guide for larger-scale setups of pretix, mostly because we believe that
+there is no one-size-fits-all solution for this and the desired setup highly depends on your use case,
+the platform you run pretix on, and your technical capabilities. We do not recommend trying set up pretix
+in a multi-server environment if you do not already have experience with managing server clusters.
+
+This document is intended to give you a general idea on what issues you will encounter when you scale up
+and what you should think of.
+
+.. tip::
+
+   If you require more help on this, we're happy to help. Our pretix Enterprise support team has built
+   and helped building, scaling and load-testing pretix installations at any scale and we're looking
+   forward to work with you on fine-tuning your system. If you intend to sell **more than a thousand
+   tickets in a very short amount of time**, we highly recommend reaching out and at least talking this
+   through. Just get in touch at sales@pretix.eu!
+
+Scaling reasons
+---------------
+
+There's mainly two reasons to scale up a pretix installation beyond a single server:
+
+* **Availability:** Distributing pretix over multiple servers can allow you to survive failure of one or more single machines, leading to a higher uptime and reliability of your system.
+
+* **Traffic and throughput:** Distributing pretix over multiple servers can allow you to process more web requests and ticket sales at the same time.
+
+You are very unlikely to require scaling for other reasons, such as having too much data in your database.
+
+Components
+----------
+
+A pretix installation usually consists of the following components which run performance-relevant processes:
+
+* ``pretix-web`` is the Django-based web application that serves all user interaction.
+
+* ``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 **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``.
+
+* A **redis** server responsible for the communication between ``pretix-web`` and ``pretix-worker``, as well as for caching.
+
+* A directory of **media files** such as user-uploaded files or generated files (tickets, invoices, …) that are created and used by ``pretix-web``, ``pretix-worker`` and the web server.
+
+In the following, we will discuss the scaling behavior of every component individually. In general, you can run all of the components
+on the same server, but you can just as well distribute every component to its own server, or even use multiple servers for some single
+components.
+
+.. warning::
+
+   When setting up your system, don't forget about security. In a multi-server environment,
+   you need to take special care to ensure that no unauthorized access to your database
+   is possible through the network and that it's not easy to wiretap your connections. We
+   recommend a rigorous use of firewalls and encryption on all communications. You can
+   ensure this either on an application level (such as using the TLS support in your
+   database) or on a network level with a VPN solution.
+
+Web server
+""""""""""
+
+Your web server is at the very front of your installation. It will need to absorb all of the traffic, and it should be able to
+at least show a decent error message, even when everything else fails. Luckily, web servers are really fast these days, so this
+can be achieved without too much work.
+
+We recommend reading up on tuning your web server for high concurrency. For nginx, this means thinking about the number of worker
+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,
+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)
+are served directly by your web server and your web server caches them in-memory (nginx does it by default) and sets useful
+headers for client-side caching. As an additional performance improvement, you can turn of access logging for these types of files.
+If you want, you can even farm out serving static files to a different web server entirely and :ref:`configure pretix to reference
+them from a different URL <config-urls>`.
+
+.. tip::
+
+   If you expect *really high traffic* for your very popular event, you might want to do some rate limiting on this layer, or,
+   if you want to ensure a fair and robust first-come-first-served experience and prefer letting users wait over showing them
+   errors, consider a queuing solution. We're happy to provide you with such systems, just get in touch at sales@pretix.eu.
+
+pretix-web
+""""""""""
+
+The ``pretix-web`` process does not carry any internal state can be easily started on as many machines as you like, and you can
+use the load balancing features of your frontend web server to redirect to all of them.
+
+You can adjust the number of processes in the ``gunicorn`` command line, and we recommend choosing roughly two times the number
+of CPU cores available. Under load, the memory consumption of ``pretix-web`` will stay comparatively constant, while the CPU usage
+will increase a lot. Therefore, if you can add more or faster CPU cores, you will be able to serve more users.
+
+pretix-worker
+"""""""""""""
+
+The ``pretix-worker`` process performs all operations that are not directly executed in the request-response-cycle of ``pretix-web``.
+Just like ``pretix-web`` you can easily start up as many instances as you want on different machines to share the work. As long as they
+all talk to the same redis server, they will all receive tasks from ``pretix-web``, work on them and post their result back.
+You can configure the number of threads that run tasks in parallel through the ``--concurrency`` command line option of ``celery``.
+
+Just like ``pretix-web``, this process is mostly heavy on CPU, disk IO and network IO, although memory peaks can occur e.g. during the
+generation of large PDF files, so we recommend having some reserves here.
+
+``pretix-worker`` performs a variety of tasks which are of different importance.
+Some of them are mission-critical and need to be run quickly even during high load (such as
+creating a cart or an order), others are irrelevant and can easily run later (such as
+distributing tickets on the waiting list). You can fine-tune the capacity you assign to each
+of these tasks by running ``pretix-worker`` processes that only work on a specific **queue**.
+For example, you could have three servers dedicated only to process order creations and one
+server dedicated only to sending emails. This allows you to set priorities and also protects
+you from e.g. a slow email server lowering your ticket throughput.
+
+You can do so by specifying one or more queues on the ``celery`` command line of this process, such as ``celery -A pretix.celery_app worker -Q notifications,mail``. Currently,
+the following queues exist:
+
+* ``checkout`` -- This queue handles everything related to carts and orders and thereby everything required to process a sale. This includes adding and deleting items from carts as well as creating and canceling orders.
+
+* ``mail`` -- This queue handles sending of outgoing emails.
+
+* ``notifications`` -- This queue handles the processing of any outgoing notifications, such as email notifications to admin users (except for the actual sending) or API notifications to registered webhooks.
+
+* ``background`` -- This queue handles tasks that are expected to take long or have no human waiting for their result immediately, such as refreshing caches, re-generating CSS files, assigning tickets on the waiting list or parsing bank data files.
+
+* ``default`` -- This queue handles everything else with "medium" or unassigned priority, most prominently the generation of files for tickets, invoices, badges, admin exports, etc.
+
+Media files
+"""""""""""
+
+Both ``pretix-web``, ``pretix-worker`` and in some cases your webserver need to work with
+media files. Media files are all files generated *at runtime* by the software. This can
+include files uploaded by the event organizers, such as the event logo, files uploaded by
+ticket buyers (if you use such features) or files generated by the software, such as
+ticket files, invoice PDFs, data exports or customized CSS files.
+
+Those files are by default stored to the ``media/`` sub-folder of the data directory given
+in the ``pretix.cfg`` configuration file. Inside that ``media/`` folder, you will find a
+``pub/`` folder containing the subset of files that should be publicly accessible through
+the web server. Everything else only needs to be accessible by ``pretix-web`` and
+``pretix-worker`` themselves.
+
+If you distribute ``pretix-web`` or ``pretix-worker`` across more than one machine, you
+**must** make sure that they all have access to a shared storage to read and write these
+files, otherwise you **will** run into errors with the user interface.
+
+The easiest solution for this is probably to store them on a NFS server that you mount
+on each of the other servers.
+
+Since we use Django's file storage mechanism internally, you can in theory also use a object-storage solution like Amazon S3, Ceph, or Minio to store these files, although we currently do not expose this through pretix' configuration file and this would require you to ship your own variant of ``pretix/settings.py`` and reference it through the ``DJANGO_SETTINGS_MODULE`` environment variable.
+
+At pretix.eu, we use a custom-built `object storage cluster`_.
+
+SQL database
+""""""""""""
+
+One of the most critical parts of the whole setup is the SQL database -- and certainly the
+hardest to scale. Tuning relational databases is an art form, and while there's lots of
+material on it on the internet, there's not a single recipe that you can apply to every case.
+
+As a general rule of thumb, the more resources you can give your databases, the better.
+Most databases will happily use all CPU cores available, but only use memory up to an amount
+you configure, so make sure to set this memory usage as high as you can afford. Having more
+memory available allows your database to make more use of caching, which is usually good.
+
+Scaling your database to multiple machines needs to be treated with great caution. It's a
+good to have a replica of your database for availability reasons. In case your primary
+database server fails, you can easily switch over to the replica and continue working.
+
+However, using database replicas for performance gains is much more complicated. When using
+replicated database systems, you are always trading in consistency or availability to get
+additional performance and the consequences of this can be subtle and it is important
+that you have a deep understanding of the semantics of your replication mechanism.
+
+.. warning::
+
+   Using an off-the-shelf database proxy solution that redirects read queries to your
+   replicas and write queries to your primary database **will lead to very nasty bugs.**
+
+   As an example, if you buy a ticket, pretix first needs to calculate how many tickets
+   are left to sell. If this calculation is done on a database replica that lags behind
+   even for fractions of a second, the decision to allow selling the ticket will be made
+   on out-of-data data and you can end up with more tickets sold than configured. Similarly,
+   you could imagine situations leading to double payments etc.
+
+If you do have a replica, you *can* tell pretix about it :ref:`in your configuration <config-replica>`.
+This way, pretix can offload complex read-only queries to the replica when it is safe to do so.
+As of pretix 2.7, this is mainly used for search queries in the backend and for rendering the
+product list and event lists in the frontend, but we plan on expanding this in the future.
+
+Therefore, for now our clear recommendation is: Try to scale your database vertically and put
+it on the most powerful machine you have available.
+
+redis
+"""""
+
+While redis is a very important part that glues together some of the components, it isn't used
+heavily and can usually handle a fairly large pretix installation easily on a single modern
+CPU core.
+Having some memory available is good in case of e.g. lots of tasks queuing up during a traffic peak, but we wouldn't expect ever needing more than a gigabyte of it.
+
+Feel free to set up a redis cluster for availability – but you won't need it for performance in a long time.
+
+The limitations
+---------------
+
+Up to a certain point, pretix scales really well. However, there are a few things that we consider
+even more important than scalability, and those are correctness and reliability. We want you to be
+able to trust that pretix will not sell more tickets than you intended or run into similar error
+cases.
+
+Combined with pretix' flexibility and complexity, especially around vouchers and quotas, this creates
+some hard issues. In many cases, we need to fall back to event-global locking for some actions which
+are likely to run with high concurrency and cause harm.
+
+For every event, only one of these locking actions can be run at the same time. Examples for this are
+adding products limited by a quota to a cart, adding items to a cart using a voucher or placing an order
+consisting of cart positions that don't have a valid reservation for much longer. In these cases, it is
+currently not realistically possible to exceed selling **approx. 500 orders per minute per event**, even
+if you add more hardware.
+If you have an unlimited number of tickets, we can apply fewer locking and we've reached **approx.
+1500 orders per minute per event** in benchmarks, although even more should be possible.
+
+We're working to reduce the number of cases in which this is relevant and thereby improve the possible
+throughput. If you want to use pretix for an event with 10,000+ tickets that are likely to be sold out
+within minutes, please get in touch to discuss possible solutions. We'll work something out for you!
+
+
+.. _object storage cluster: https://behind.pretix.eu/2018/03/20/high-available-cdn/

doc/api/fundamentals.rst

@@ -181,4 +181,37 @@ as the string values ``true`` and ``false``.
 If the ``ordering`` parameter is documented for a resource, you can use it to sort the result set by one of the allowed
 fields. Prepend a ``-`` to the field name to reverse the sort order.
 
+
+Idempotency
+-----------
+
+Our API supports an idempotency mechanism to make sure you can safely retry operations without accidentally performing
+them twice. This is useful if an API call experiences interruptions in transit, e.g. due to a network failure, and you
+do not know if it completed successfully.
+
+To perform an idempotent request, add a ``X-Idempotency-Key`` header with a random string value (we recommend a version
+4 UUID) to your request. If we see a second request with the same ``X-Idempotency-Key`` and the same ``Authorization``
+and ``Cookie`` headers, we will not perform the action for a second time but return the exact same response instead.
+
+Please note that this also goes for most error responses. For example, if we returned you a ``403 Permission Denied``
+error and you retry with the same ``X-Idempotency-Key``, you will get the same error again, even if you were granted
+permission in the meantime! This includes internal server errors on our side that might have been fixed in the meantime.
+
+There are only three exceptions to the rule:
+
+* Responses with status code ``409 Conflict`` are not cached. If you send the request again, it will be executed as a
+  new request, since these responses are intended to be retried.
+
+* Rate-limited responses with status code ``429 Too Many Requests`` are not cached and you can safely retry them.
+
+* Responses with status code ``503 Service Unavailable`` are not cached and you can safely retry them.
+
+If you send a request with an ``X-Idempotency-Key`` header that we have seen before but that has not yet received a
+response, you will receive a response with status code ``409 Conflict`` and are asked to retry after five seconds.
+
+We store idempotency keys for 24 hours, so you should never retry a request after a longer time period.
+
+All ``POST``, ``PUT``, ``PATCH``, or ``DELETE`` api calls support idempotency keys. Adding an idempotency key to a
+``GET``, ``HEAD``, or ``OPTIONS`` request has no effect.
+
 .. _CSRF policies: https://docs.djangoproject.com/en/1.11/ref/csrf/#ajax

doc/api/resources/billing_invoices.rst

@@ -0,0 +1,131 @@
+pretix Hosted billing invoices
+==============================
+
+This endpoint allows you to access invoices you received for pretix Hosted. It only contains invoices created starting
+November 2017.
+
+.. note:: Only available on pretix Hosted, not on self-hosted pretix instances.
+
+Resource description
+--------------------
+
+The resource contains the following public fields:
+
+.. rst-class:: rest-resource-table
+
+===================================== ========================== =======================================================
+Field                                 Type                       Description
+===================================== ========================== =======================================================
+invoice_number                        string                     Invoice number
+date_issued                           date                       Invoice date
+===================================== ========================== =======================================================
+
+
+Endpoints
+---------
+
+.. http:get:: /api/v1/organizers/(organizer)/billing_invoices/
+
+   Returns a list of all invoices to a given organizer.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/billing_invoices/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "count": 1,
+        "next": null,
+        "previous": null,
+        "results": [
+          {
+            "invoice_number": "R2019002",
+            "date_issued": "2019-06-03"
+          }
+        ]
+      }
+
+   :query integer page: The page number in case of a multi-page result set, default is 1
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``date_issued`` and
+                           its reverse, ``-date_issued``. Default: ``date_issued``.
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
+.. http:get:: /api/v1/organizers/(organizer)/billing_invoices/(invoice_number)/
+
+   Returns information on one invoice, identified by its invoice number.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/billing_invoices/R2019002/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/json
+
+      {
+        "invoice_number": "R2019002",
+        "date_issued": "2019-06-03"
+      }
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param invoice_number: The ``invoice_number`` field of the invoice to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+
+.. http:get:: /api/v1/organizers/(organizer)/billing_invoices/(invoice_number)/download/
+
+   Download an invoice in PDF format.
+
+   .. warning:: After we created the invoices, they are placed in review with our accounting department. You will
+                already see them in the API at this point, but you are not able to download them until they completed
+                review and are sent to you via email. This usually takes a few hours. If you try to download them
+                in this time frame, you will receive a status code :http:statuscode:`423`.
+
+   **Example request**:
+
+   .. sourcecode:: http
+
+      GET /api/v1/organizers/bigevents/billing_invoices/R2019002/download/ HTTP/1.1
+      Host: pretix.eu
+      Accept: application/json, text/javascript
+
+   **Example response**:
+
+   .. sourcecode:: http
+
+      HTTP/1.1 200 OK
+      Vary: Accept
+      Content-Type: application/pdf
+
+      ...
+
+   :param organizer: The ``slug`` field of the organizer to fetch
+   :param invoice_number: The ``invoice_number`` field of the invoice to fetch
+   :statuscode 200: no error
+   :statuscode 401: Authentication failure
+   :statuscode 403: The requested organizer/event does not exist **or** you have no permission to view this resource.
+   :statuscode 423: The file is not yet ready and will now be prepared. Retry the request after waiting for a few
+                    seconds.

doc/api/resources/checkinlists.rst

@@ -336,11 +336,24 @@ Order position endpoints
 
    The order positions endpoint has been extended by the filter queries ``voucher`` and ``voucher__code``.
 
+.. versionchanged:: 2.7
+
+   The resource now contains the new attributes ``require_attention`` and ``order__status`` and accepts the new
+   ``ignore_status`` filter. The ``attendee_name`` field is now "smart" (see below) and the redemption endpoint
+   returns ``400`` instead of ``404`` on tickets which are known but not paid.
+
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/checkinlists/(list)/positions/
 
    Returns a list of all order positions within a given event. The result is the same as
-   the :ref:`order-position-resource`, with one important difference: the ``checkins`` value will only include
-   check-ins for the selected list.
+   the :ref:`order-position-resource`, with the following differences:
+
+   * The ``checkins`` value will only include check-ins for the selected list.
+
+   * An additional boolean property ``require_attention`` will inform you whether either the order or the item
+     have the ``checkin_attention`` flag set.
+
+   * If ``attendee_name`` is empty, it will automatically fall back to values from a parent product or from invoice
+     addresses.
 
    **Example request**:
 
@@ -407,6 +420,8 @@ Order position endpoints
       }
 
    :query integer page: The page number in case of a multi-page result set, default is 1
+   :query string ignore_status: If set to ``true``, results will be returned regardless of the state of
+                                 the order they belong to and you will need to do your own filtering by order status.
    :query string ordering: Manually set the ordering of results. Valid fields to be used are ``order__code``,
                            ``order__datetime``, ``positionid``, ``attendee_name``, ``last_checked_in`` and ``order__email``. Default:
                            ``attendee_name,positionid``
@@ -442,8 +457,15 @@ Order position endpoints
 .. http:get:: /api/v1/organizers/(organizer)/events/(event)/checkinlists/(list)/positions/(id)/
 
    Returns information on one order position, identified by its internal ID.
-   The result format is the same as the :ref:`order-position-resource`, with one important difference: the
-   ``checkins`` value will only include check-ins for the selected list.
+   The result is the same as the :ref:`order-position-resource`, with the following differences:
+
+   * The ``checkins`` value will only include check-ins for the selected list.
+
+   * An additional boolean property ``require_attention`` will inform you whether either the order or the item
+     have the ``checkin_attention`` flag set.
+
+   * If ``attendee_name`` is empty, it will automatically fall back to values from a parent product or from invoice
+     addresses.
 
    **Instead of an ID, you can also use the ``secret`` field as the lookup parameter.**
 
@@ -528,7 +550,8 @@ Order position endpoints
    :<json boolean force: Specifies that the check-in should succeed regardless of previous check-ins or required
                          questions that have not been filled. Defaults to ``false``.
    :<json boolean ignore_unpaid: Specifies that the check-in should succeed even if the order is in pending state.
-                                 Defaults to ``false``.
+                                 Defaults to ``false`` and only works when ``include_pending`` is set on the check-in
+                                 list.
    :<json string nonce: You can set this parameter to a unique random value to identify this check-in. If you're sending
                         this request twice with the same nonce, the second request will also succeed but will always
                         create only one check-in object even when the previous request was successful as well. This

doc/api/resources/events.rst

@@ -50,6 +50,10 @@ plugins                               list                       A list of packa
 
    The ``testmode`` attribute has been added.
 
+.. versionchanged:: 2.8
+
+    When cloning events, the ``testmode`` attribute will now be cloned, too.
+
 Endpoints
 ---------
 
@@ -112,6 +116,9 @@ Endpoints
    :query is_future: If set to ``true`` (``false``), only events that happen currently or in the future are (not) returned. Event series are never (always) returned.
    :query is_past: If set to ``true`` (``false``), only events that are over are (not) returned. Event series are never (always) returned.
    :query ends_after: If set to a date and time, only events that happen during of after the given time are returned. Event series are never returned.
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``date_from`` and
+                           ``slug``. Keep in mind that ``date_from`` of event series does not really tell you anything.
+                           Default: ``slug``.
    :param organizer: The ``slug`` field of a valid organizer
    :statuscode 200: no error
    :statuscode 401: Authentication failure
@@ -246,7 +253,7 @@ Endpoints
 .. http:post:: /api/v1/organizers/(organizer)/events/(event)/clone/
 
    Creates a new event with properties as set in the request body. The properties that are copied are: 'is_public',
-   settings, plugin settings, items, variations, add-ons, quotas, categories, tax rules, questions.
+   `testmode`, settings, plugin settings, items, variations, add-ons, quotas, categories, tax rules, questions.
 
    If the 'plugins' and/or 'is_public' fields are present in the post body this will determine their value. Otherwise
    their value will be copied from the existing event.

doc/api/resources/index.rst

@@ -23,3 +23,4 @@ Resources and endpoints
    waitinglist
    carts
    webhooks
+   billing_invoices

doc/api/resources/item_variations.rst

@@ -18,12 +18,18 @@ default_price                         money (string)             The price set d
 price                                 money (string)             The price used for this variation. This is either the
                                                                  same as ``default_price`` if that value is set or equal
                                                                  to the item's ``default_price`` (read-only).
+original_price                        money (string)             An original price, shown for comparison, not used
+                                                                 for price calculations (or ``null``).
 active                                boolean                    If ``false``, this variation will not be sold or shown.
 description                           multi-lingual string       A public description of the variation. May contain
                                                                  Markdown syntax or can be ``null``.
 position                              integer                    An integer, used for sorting
 ===================================== ========================== =======================================================
 
+.. versionchanged:: 2.7
+
+   The attribute ``original_price`` has been added.
+
 .. versionchanged:: 1.12
 
    This resource has been added.
@@ -67,7 +73,8 @@ Endpoints
             },
             "position": 0,
             "default_price": "223.00",
-            "price": 223.0
+            "price": 223.0,
+            "original_price": null,
           },
           {
             "id": 3,
@@ -120,6 +127,7 @@ Endpoints
         },
         "default_price": "10.00",
         "price": "10.00",
+        "original_price": null,
         "active": true,
         "description": null,
         "position": 0
@@ -167,6 +175,7 @@ Endpoints
         "value": {"en": "Student"},
         "default_price": "10.00",
         "price": "10.00",
+        "original_price": null,
         "active": true,
         "description": null,
         "position": 0
@@ -216,6 +225,7 @@ Endpoints
         "value": {"en": "Student"},
         "default_price": "10.00",
         "price": "10.00",
+        "original_price": null,
         "active": false,
         "description": null,
         "position": 1

doc/api/resources/items.rst

@@ -29,7 +29,8 @@ free_price                            boolean                    If ``true``, cu
                                                                  they buy the product (however, the price can't be set
                                                                  lower than the price defined by ``default_price`` or
                                                                  otherwise).
-tax_rate                              decimal (string)           The VAT rate to be applied for this item.
+tax_rate                              decimal (string)           The VAT rate to be applied for this item (read-only,
+                                                                 set through ``tax_rule``).
 tax_rule                              integer                    The internal ID of the applied tax rule (or ``null``).
 admission                             boolean                    ``true`` for items that grant admission to the event
                                                                  (such as primary tickets) and ``false`` for others
@@ -81,6 +82,8 @@ variations                            list of objects            A list with one
 ├ price                               money (string)             The price used for this variation. This is either the
                                                                  same as ``default_price`` if that value is set or equal
                                                                  to the item's ``default_price``.
+├ original_price                      money (string)             An original price, shown for comparison, not used
+                                                                 for price calculations (or ``null``).
 ├ active                              boolean                    If ``false``, this variation will not be sold or shown.
 ├ description                         multi-lingual string       A public description of the variation. May contain
                                                                  Markdown syntax or can be ``null``.
@@ -105,6 +108,10 @@ bundles                               list of objects            Definition of b
                                                                  taxation. This is not added to the price.
 ===================================== ========================== =======================================================
 
+.. versionchanged:: 2.7
+
+   The attribute ``original_price`` has been added for ``variations``.
+
 .. versionchanged:: 1.7
 
    The attribute ``tax_rule`` has been added. ``tax_rate`` is kept for compatibility. The attribute
@@ -207,6 +214,7 @@ Endpoints
                  "value": {"en": "Student"},
                  "default_price": "10.00",
                  "price": "10.00",
+                 "original_price": null,
                  "active": true,
                  "description": null,
                  "position": 0
@@ -215,6 +223,7 @@ Endpoints
                  "value": {"en": "Regular"},
                  "default_price": null,
                  "price": "23.00",
+                 "original_price": null,
                  "active": true,
                  "description": null,
                  "position": 1
@@ -296,6 +305,7 @@ Endpoints
              "value": {"en": "Student"},
              "default_price": "10.00",
              "price": "10.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 0
@@ -304,6 +314,7 @@ Endpoints
              "value": {"en": "Regular"},
              "default_price": null,
              "price": "23.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 1
@@ -365,6 +376,7 @@ Endpoints
              "value": {"en": "Student"},
              "default_price": "10.00",
              "price": "10.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 0
@@ -373,6 +385,7 @@ Endpoints
              "value": {"en": "Regular"},
              "default_price": null,
              "price": "23.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 1
@@ -423,6 +436,7 @@ Endpoints
              "value": {"en": "Student"},
              "default_price": "10.00",
              "price": "10.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 0
@@ -431,6 +445,7 @@ Endpoints
              "value": {"en": "Regular"},
              "default_price": null,
              "price": "23.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 1
@@ -512,6 +527,7 @@ Endpoints
              "value": {"en": "Student"},
              "default_price": "10.00",
              "price": "10.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 0
@@ -520,6 +536,7 @@ Endpoints
              "value": {"en": "Regular"},
              "default_price": null,
              "price": "23.00",
+             "original_price": null,
              "active": true,
              "description": null,
              "position": 1

doc/api/resources/orders.rst

@@ -373,8 +373,8 @@ List of all orders
       }
 
    :query integer page: The page number in case of a multi-page result set, default is 1
-   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``datetime``, ``code`` and
-                           ``status``. Default: ``datetime``
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``datetime``, ``code``,
+                           ``last_modified``, and ``status``. Default: ``datetime``
    :query string code: Only return orders that match the given order code
    :query string status: Only return orders in the given order status (see above)
    :query boolean testmode: Only return orders with ``testmode`` set to ``true`` or ``false``
@@ -385,6 +385,7 @@ List of all orders
    :query datetime modified_since: Only return orders that have changed since the given date. Be careful: We only
        recommend using this in combination with ``testmode=false``, since test mode orders can vanish at any time and
        you will not notice it using this method.
+   :query datetime created_since: Only return orders that have been created since the given date.
    :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
@@ -749,6 +750,7 @@ Creating orders
      should only use this if you know the specific payment provider in detail. Please keep in mind that the payment
      provider will not be called to do anything about this (i.e. if you pass a bank account to a debit provider, *no*
      charge will be created), this is just informative in case you *handled the payment already*.
+   * ``payment_date`` (optional) – Date and time of the completion of the payment.
    * ``comment`` (optional)
    * ``checkin_attention`` (optional)
    * ``invoice_address`` (optional)
@@ -788,6 +790,8 @@ Creating orders
       * ``internal_type``
       * ``tax_rule``
 
+   * ``force`` (optional). If set to ``true``, quotas will be ignored.
+
    If you want to use add-on products, you need to set the ``positionid`` fields of all positions manually
    to incrementing integers starting with ``1``. Then, you can reference one of these
    IDs in the ``addon_to`` field of another position. Note that all add_ons for a specific position need to come

doc/api/resources/organizers.rst

@@ -56,6 +56,8 @@ Endpoints
       }
 
    :query page: The page number in case of a multi-page result set, default is 1
+   :query string ordering: Manually set the ordering of results. Valid fields to be used are ``slug`` and
+                           ``name``. Default: ``slug``.
    :statuscode 200: no error
    :statuscode 401: Authentication failure
 

doc/api/resources/questions.rst

@@ -30,6 +30,7 @@ type                                  string                     The expected ty
                                                                  * ``D`` – date
                                                                  * ``H`` – time
                                                                  * ``W`` – date and time
+                                                                 * ``CC`` – country code (ISO 3666-1 alpha-2)
 required                              boolean                    If ``true``, the question needs to be filled out.
 position                              integer                    An integer, used for sorting
 items                                 list of integers           List of item IDs this question is assigned to.
@@ -38,6 +39,8 @@ identifier                            string                     An arbitrary st
 ask_during_checkin                    boolean                    If ``true``, this question will not be asked while
                                                                  buying the ticket, but will show up when redeeming
                                                                  the ticket instead.
+hidden                                boolean                    If ``true``, the question will only be shown in the
+                                                                 backend.
 options                               list of objects            In case of question type ``C`` or ``M``, this lists the
                                                                  available objects. Only writable during creation,
                                                                  use separate endpoint to modify this later.
@@ -68,6 +71,10 @@ dependency_value                      string                     The value ``dep
   Write methods have been added. The attribute ``identifier`` has been added to both the resource itself and the
   options resource. The ``position`` attribute has been added to the options resource.
 
+.. versionchanged:: 2.7
+
+  The attribute ``hidden`` and the question type ``CC`` have been added.
+
 Endpoints
 ---------
 
@@ -110,6 +117,7 @@ Endpoints
             "position": 1,
             "identifier": "WY3TP9SL",
             "ask_during_checkin": false,
+            "hidden": false,
             "dependency_question": null,
             "dependency_value": null,
             "options": [
@@ -177,6 +185,7 @@ Endpoints
         "position": 1,
         "identifier": "WY3TP9SL",
         "ask_during_checkin": false,
+        "hidden": false,
         "dependency_question": null,
         "dependency_value": null,
         "options": [
@@ -228,6 +237,7 @@ Endpoints
         "items": [1, 2],
         "position": 1,
         "ask_during_checkin": false,
+        "hidden": false,
         "dependency_question": null,
         "dependency_value": null,
         "options": [
@@ -261,6 +271,7 @@ Endpoints
         "position": 1,
         "identifier": "WY3TP9SL",
         "ask_during_checkin": false,
+        "hidden": false,
         "dependency_question": null,
         "dependency_value": null,
         "options": [
@@ -332,6 +343,7 @@ Endpoints
         "position": 2,
         "identifier": "WY3TP9SL",
         "ask_during_checkin": false,
+        "hidden": false,
         "dependency_question": null,
         "dependency_value": null,
         "options": [

doc/api/resources/subevents.rst

@@ -20,6 +20,8 @@ name                                  multi-lingual string       The sub-event's
 event                                 string                     The slug of the parent event
 active                                boolean                    If ``true``, the sub-event ticket shop is publicly
                                                                  available.
+is_public                             boolean                    If ``true``, the sub-event ticket shop is publicly
+                                                                 shown in lists.
 date_from                             datetime                   The sub-event's start date
 date_to                               datetime                   The sub-event's end date (or ``null``)
 date_admission                        datetime                   The sub-event's admission date (or ``null``)
@@ -48,6 +50,10 @@ meta_data                             dict                       Values set for
 .. versionchanged:: 2.6
    The write operations ``POST``, ``PATCH``, ``PUT``, and ``DELETE`` have been added.
 
+.. versionchanged:: 2.7
+
+   The attribute ``is_public`` has been added.
+
 Endpoints
 ---------
 
@@ -81,6 +87,7 @@ Endpoints
             "name": {"en": "First Sample Conference"},
             "event": "sampleconf",
             "active": false,
+            "is_public": true,
             "date_from": "2017-12-27T10:00:00Z",
             "date_to": null,
             "date_admission": null,
@@ -128,6 +135,7 @@ Endpoints
       {
         "name": {"en": "First Sample Conference"},
         "active": false,
+        "is_public": true,
         "date_from": "2017-12-27T10:00:00Z",
         "date_to": null,
         "date_admission": null,
@@ -157,6 +165,7 @@ Endpoints
         "id": 1,
         "name": {"en": "First Sample Conference"},
         "active": false,
+        "is_public": true,
         "date_from": "2017-12-27T10:00:00Z",
         "date_to": null,
         "date_admission": null,
@@ -207,6 +216,7 @@ Endpoints
         "name": {"en": "First Sample Conference"},
         "event": "sampleconf",
         "active": false,
+        "is_public": true,
         "date_from": "2017-12-27T10:00:00Z",
         "date_to": null,
         "date_admission": null,
@@ -270,6 +280,7 @@ Endpoints
         "name": {"en": "New Subevent Name"},
         "event": "sampleconf",
         "active": false,
+        "is_public": true,
         "date_from": "2017-12-27T10:00:00Z",
         "date_to": null,
         "date_admission": null,
@@ -353,6 +364,7 @@ Endpoints
             "name": {"en": "First Sample Conference"},
             "event": "sampleconf",
             "active": false,
+            "is_public": true,
             "date_from": "2017-12-27T10:00:00Z",
             "date_to": null,
             "date_admission": null,

doc/conf.py

@@ -66,7 +66,7 @@ source_suffix = '.rst'
 #source_encoding = 'utf-8-sig'
 
 # The master toctree document.
-master_doc = 'contents'
+master_doc = 'index'
 
 # General information about the project.
 project = 'pretix'
@@ -234,7 +234,7 @@ latex_elements = {
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-  ('contents', 'pretix.tex', 'pretix Documentation',
+  ('index', 'pretix.tex', 'pretix Documentation',
    'Raphael Michel', 'manual'),
 ]
 

doc/development/api/general.rst

@@ -12,7 +12,7 @@ Core
 
 .. automodule:: pretix.base.signals
    :members: periodic_task, event_live_issues, event_copy_data, email_filter, register_notification_types,
-      item_copy_data, register_sales_channels
+      item_copy_data, register_sales_channels, register_global_settings
 
 Order events
 """"""""""""
@@ -20,17 +20,13 @@ Order events
 There are multiple signals that will be sent out in the ordering cycle:
 
 .. automodule:: pretix.base.signals
-   :members: validate_cart, order_fee_calculation, order_paid, order_placed, order_fee_type_name, allow_ticket_download
+   :members: validate_cart, validate_order, order_fee_calculation, order_paid, order_placed, order_canceled, order_expired, order_modified, order_changed, order_approved, order_denied, order_fee_type_name, allow_ticket_download
 
 Frontend
 --------
 
 .. automodule:: pretix.presale.signals
-   :members: html_head, html_footer, footer_link, front_page_top, front_page_bottom, fee_calculation_for_cart, contact_form_fields, question_form_fields, checkout_confirm_messages, checkout_confirm_page_content, checkout_all_optional, html_page_header, sass_preamble, sass_postamble
-
-
-.. automodule:: pretix.presale.signals
-   :members: order_info, order_meta_from_request
+   :members: html_head, html_footer, footer_link, front_page_top, front_page_bottom, fee_calculation_for_cart, contact_form_fields, question_form_fields, checkout_confirm_messages, checkout_confirm_page_content, checkout_all_optional, html_page_header, sass_preamble, sass_postamble, checkout_flow_steps, order_info, order_meta_from_request, position_info
 
 Request flow
 """"""""""""
@@ -53,7 +49,7 @@ Backend
 
 
 .. automodule:: pretix.base.signals
-   :members: logentry_display, logentry_object_link, requiredaction_display
+   :members: logentry_display, logentry_object_link, requiredaction_display, timeline_events
 
 Vouchers
 """"""""

doc/development/api/plugins.rst

@@ -49,15 +49,19 @@ description        string               A more verbose description of what your
 visible            boolean (optional)   ``True`` by default, can hide a plugin so it cannot be normally activated.
 restricted         boolean (optional)   ``False`` by default, restricts a plugin such that it can only be enabled
                                         for an event by system administrators / superusers.
+compatibility      string               Specifier for compatible pretix versions.
 ================== ==================== ===========================================================
 
 A working example would be::
 
-    from django.apps import AppConfig
+    try:
+        from pretix.base.plugins import PluginConfig
+    except ImportError:
+        raise RuntimeError("Please use pretix 2.7 or above to run this plugin!")
     from django.utils.translation import ugettext_lazy as _
 
 
-    class PaypalApp(AppConfig):
+    class PaypalApp(PluginConfig):
         name = 'pretix_paypal'
         verbose_name = _("PayPal")
 
@@ -68,6 +72,7 @@ A working example would be::
             visible = True
             restricted = False
             description = _("This plugin allows you to receive payments via PayPal")
+            compatibility = "pretix>=2.7.0"
 
 
     default_app_config = 'pretix_paypal.PaypalApp'

doc/development/implementation/models.rst

@@ -23,7 +23,7 @@ Organizers and events
    :members:
 
 .. autoclass:: pretix.base.models.Event
-   :members: get_date_from_display, get_time_from_display, get_date_to_display, get_date_range_display, presale_has_ended, presale_is_running, cache, lock, get_plugins, get_mail_backend, payment_term_last, get_payment_providers, get_invoice_renderers, active_subevents, invoice_renderer, settings
+   :members: get_date_from_display, get_time_from_display, get_date_to_display, get_date_range_display, presale_has_ended, presale_is_running, cache, lock, get_plugins, get_mail_backend, payment_term_last, get_payment_providers, get_invoice_renderers, invoice_renderer, settings
 
 .. autoclass:: pretix.base.models.SubEvent
    :members: get_date_from_display, get_time_from_display, get_date_to_display, get_date_range_display, presale_has_ended, presale_is_running

doc/development/setup.rst

@@ -21,10 +21,12 @@ Your should install the following on your system:
 * Python 3.5 or newer
 * ``pip`` for Python 3 (Debian package: ``python3-pip``)
 * ``python-dev`` for Python 3 (Debian package: ``python3-dev``)
+* On Debian/Ubuntu: ``python-venv`` for Python 3 (Debian package: ``python3-venv``)
 * ``libffi`` (Debian package: ``libffi-dev``)
 * ``libssl`` (Debian package: ``libssl-dev``)
 * ``libxml2`` (Debian package ``libxml2-dev``)
 * ``libxslt`` (Debian package ``libxslt1-dev``)
+* ``libenchant1c2a`` (Debian package ``libenchant1c2a``)
 * ``msgfmt`` (Debian package ``gettext``)
 * ``git``
 

doc/spelling_wordlist.txt

@@ -15,6 +15,7 @@ boolean
 booleans
 cancelled
 casted
+Ceph
 checkbox
 checksum
 config
@@ -53,6 +54,7 @@ linters
 memcached
 metadata
 middleware
+Minio
 mixin
 mixins
 multi
@@ -94,6 +96,7 @@ renderer
 renderers
 reportlab
 SaaS
+scalability
 screenshot
 scss
 searchable
@@ -124,6 +127,7 @@ unconfigured
 unix
 unprefixed
 untrusted
+uptime
 username
 url
 versa

src/pretix/__init__.py

@@ -1 +1 @@
-__version__ = "2.6.0.dev0"
+__version__ = "2.8.0"

src/pretix/api/auth/device.py

@@ -19,7 +19,7 @@ class DeviceTokenAuthentication(TokenAuthentication):
         if not device.initialized:
             raise exceptions.AuthenticationFailed('Device has not been initialized.')
 
-        if not device.api_token:
+        if device.revoked:
             raise exceptions.AuthenticationFailed('Device access has been revoked.')
 
         return AnonymousUser(), device

src/pretix/api/auth/permission.py

@@ -1,7 +1,8 @@
 from rest_framework.permissions import SAFE_METHODS, BasePermission
 
 from pretix.api.models import OAuthAccessToken
-from pretix.base.models import Device, Event
+from pretix.base.models import Device, Event, User
+from pretix.base.models.auth import SuperuserPermissionSet
 from pretix.base.models.organizer import Organizer, TeamAPIToken
 from pretix.helpers.security import (
     SessionInvalid, SessionReauthRequired, assert_session_valid,
@@ -37,10 +38,13 @@ class EventPermission(BasePermission):
                 slug=request.resolver_match.kwargs['event'],
                 organizer__slug=request.resolver_match.kwargs['organizer'],
             ).select_related('organizer').first()
-            if not request.event or not perm_holder.has_event_permission(request.event.organizer, request.event):
+            if not request.event or not perm_holder.has_event_permission(request.event.organizer, request.event, request=request):
                 return False
             request.organizer = request.event.organizer
-            request.eventpermset = perm_holder.get_event_permission_set(request.organizer, request.event)
+            if isinstance(perm_holder, User) and perm_holder.has_active_staff_session(request.session.session_key):
+                request.eventpermset = SuperuserPermissionSet()
+            else:
+                request.eventpermset = perm_holder.get_event_permission_set(request.organizer, request.event)
 
             if required_permission and required_permission not in request.eventpermset:
                 return False
@@ -49,9 +53,12 @@ class EventPermission(BasePermission):
             request.organizer = Organizer.objects.filter(
                 slug=request.resolver_match.kwargs['organizer'],
             ).first()
-            if not request.organizer or not perm_holder.has_organizer_permission(request.organizer):
+            if not request.organizer or not perm_holder.has_organizer_permission(request.organizer, request=request):
                 return False
-            request.orgapermset = perm_holder.get_organizer_permission_set(request.organizer)
+            if isinstance(perm_holder, User) and perm_holder.has_active_staff_session(request.session.session_key):
+                request.orgapermset = SuperuserPermissionSet()
+            else:
+                request.orgapermset = perm_holder.get_organizer_permission_set(request.organizer)
 
             if required_permission and required_permission not in request.orgapermset:
                 return False

src/pretix/api/middleware.py

@@ -0,0 +1,91 @@
+import json
+from hashlib import sha1
+
+from django.conf import settings
+from django.db import transaction
+from django.http import HttpRequest, HttpResponse, JsonResponse
+from django.utils.timezone import now
+from rest_framework import status
+
+from pretix.api.models import ApiCall
+
+
+class IdempotencyMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request: HttpRequest):
+        if request.method in ('GET', 'HEAD', 'OPTIONS'):
+            return self.get_response(request)
+
+        if not request.path.startswith('/api/'):
+            return self.get_response(request)
+
+        if not request.headers.get('X-Idempotency-Key'):
+            return self.get_response(request)
+
+        auth_hash_parts = '{}:{}'.format(
+            request.headers.get('Authorization', ''),
+            request.COOKIES.get(settings.SESSION_COOKIE_NAME, '')
+        )
+        auth_hash = sha1(auth_hash_parts.encode()).hexdigest()
+        idempotency_key = request.headers.get('X-Idempotency-Key', '')
+
+        with transaction.atomic():
+            call, created = ApiCall.objects.select_for_update().get_or_create(
+                auth_hash=auth_hash,
+                idempotency_key=idempotency_key,
+                defaults={
+                    'locked': now(),
+                    'request_method': request.method,
+                    'request_path': request.path,
+                    'response_code': 0,
+                    'response_headers': '{}',
+                    'response_body': b''
+                }
+            )
+
+        if created:
+            resp = self.get_response(request)
+            with transaction.atomic():
+                if resp.status_code in (409, 429, 503):
+                    # This is the exception: These calls are *meant* to be retried!
+                    call.delete()
+                else:
+                    call.response_code = resp.status_code
+                    if isinstance(resp.content, str):
+                        call.response_body = resp.content.encode()
+                    elif isinstance(resp.content, memoryview):
+                        call.response_body = resp.content.tobytes()
+                    elif isinstance(resp.content, bytes):
+                        call.response_body = resp.content
+                    elif hasattr(resp.content, 'read'):
+                        call.response_body = resp.read()
+                    elif hasattr(resp, 'data'):
+                        call.response_body = json.dumps(resp.data)
+                    else:
+                        call.response_body = repr(resp).encode()
+                    call.response_headers = json.dumps(resp._headers)
+                    call.locked = None
+                    call.save(update_fields=['locked', 'response_code', 'response_headers',
+                                             'response_body'])
+            return resp
+        else:
+            if call.locked:
+                r = JsonResponse(
+                    {'detail': 'Concurrent request with idempotency key.'},
+                    status=status.HTTP_409_CONFLICT,
+                )
+                r['Retry-After'] = 5
+                return r
+
+            content = call.response_body
+            if isinstance(content, memoryview):
+                content = content.tobytes()
+            r = HttpResponse(
+                content=content,
+                status=call.response_code,
+            )
+            for k, v in json.loads(call.response_headers).values():
+                r[k] = v
+            return r

src/pretix/api/migrations/0004_auto_20190405_1048.py

@@ -0,0 +1,44 @@
+# Generated by Django 2.1.5 on 2019-04-05 10:48
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('pretixbase', '0116_auto_20190402_0722'),
+        ('pretixapi', '0003_webhook_webhookcall_webhookeventlistener'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ApiCall',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('idempotency_key', models.CharField(db_index=True, max_length=190)),
+                ('auth_hash', models.CharField(db_index=True, max_length=190)),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('locked', models.DateTimeField(null=True)),
+                ('request_method', models.CharField(max_length=20)),
+                ('request_path', models.CharField(max_length=255)),
+                ('response_code', models.PositiveIntegerField()),
+                ('response_headers', models.TextField()),
+                ('response_body', models.BinaryField()),
+            ],
+        ),
+        migrations.AlterModelOptions(
+            name='webhookcall',
+            options={'ordering': ('-datetime',)},
+        ),
+        migrations.AlterModelOptions(
+            name='webhookeventlistener',
+            options={'ordering': ('action_type',)},
+        ),
+        migrations.AlterUniqueTogether(
+            name='apicall',
+            unique_together={('idempotency_key', 'auth_hash')},
+        ),
+    ]

src/pretix/api/models.py

@@ -77,6 +77,9 @@ class WebHook(models.Model):
     all_events = models.BooleanField(default=True, verbose_name=_("All events (including newly created ones)"))
     limit_events = models.ManyToManyField('pretixbase.Event', verbose_name=_("Limit to events"), blank=True)
 
+    class Meta:
+        ordering = ('id',)
+
     @property
     def action_types(self):
         return [
@@ -106,3 +109,20 @@ class WebHookCall(models.Model):
 
     class Meta:
         ordering = ("-datetime",)
+
+
+class ApiCall(models.Model):
+    idempotency_key = models.CharField(max_length=190, db_index=True)
+    auth_hash = models.CharField(max_length=190, db_index=True)
+    created = models.DateTimeField(auto_now_add=True)
+    locked = models.DateTimeField(null=True)
+
+    request_method = models.CharField(max_length=20)
+    request_path = models.CharField(max_length=255)
+
+    response_code = models.PositiveIntegerField()
+    response_headers = models.TextField()
+    response_body = models.BinaryField()
+
+    class Meta:
+        unique_together = (('idempotency_key', 'auth_hash'),)

src/pretix/api/serializers/event.py

@@ -31,10 +31,10 @@ class PluginsField(Field):
     def to_representation(self, obj):
         from pretix.base.plugins import get_all_plugins
 
-        return {
+        return sorted([
             p.module for p in get_all_plugins()
             if not p.name.startswith('.') and getattr(p, 'visible', True) and p.module in obj.get_plugins()
-        }
+        ])
 
     def to_internal_value(self, data):
         return {
@@ -164,6 +164,7 @@ class CloneEventSerializer(EventSerializer):
     def create(self, validated_data):
         plugins = validated_data.pop('plugins', None)
         is_public = validated_data.pop('is_public', None)
+        testmode = validated_data.pop('testmode', None)
         new_event = super().create(validated_data)
 
         event = Event.objects.filter(slug=self.context['event'], organizer=self.context['organizer'].pk).first()
@@ -173,6 +174,8 @@ class CloneEventSerializer(EventSerializer):
             new_event.set_active_plugins(plugins)
         if is_public is not None:
             new_event.is_public = is_public
+        if testmode is not None:
+            new_event.testmode = testmode
         new_event.save()
 
         return new_event
@@ -199,7 +202,7 @@ class SubEventSerializer(I18nAwareModelSerializer):
     class Meta:
         model = SubEvent
         fields = ('id', 'name', 'date_from', 'date_to', 'active', 'date_admission',
-                  'presale_start', 'presale_end', 'location', 'event',
+                  'presale_start', 'presale_end', 'location', 'event', 'is_public',
                   'item_price_overrides', 'variation_price_overrides', 'meta_data')
 
     def validate(self, data):
@@ -212,8 +215,8 @@ class SubEventSerializer(I18nAwareModelSerializer):
         Event.clean_dates(data.get('date_from'), data.get('date_to'))
         Event.clean_presale(data.get('presale_start'), data.get('presale_end'))
 
-        SubEvent.clean_items(event, [item['item'] for item in full_data.get('subeventitem_set')])
-        SubEvent.clean_variations(event, [item['variation'] for item in full_data.get('subeventitemvariation_set')])
+        SubEvent.clean_items(event, [item['item'] for item in full_data.get('subeventitem_set', [])])
+        SubEvent.clean_variations(event, [item['variation'] for item in full_data.get('subeventitemvariation_set', [])])
         return data
 
     def validate_item_price_overrides(self, data):

src/pretix/api/serializers/item.py

@@ -19,7 +19,7 @@ class InlineItemVariationSerializer(I18nAwareModelSerializer):
     class Meta:
         model = ItemVariation
         fields = ('id', 'value', 'active', 'description',
-                  'position', 'default_price', 'price')
+                  'position', 'default_price', 'price', 'original_price')
 
 
 class ItemVariationSerializer(I18nAwareModelSerializer):
@@ -29,7 +29,7 @@ class ItemVariationSerializer(I18nAwareModelSerializer):
     class Meta:
         model = ItemVariation
         fields = ('id', 'value', 'active', 'description',
-                  'position', 'default_price', 'price')
+                  'position', 'default_price', 'price', 'original_price')
 
 
 class InlineItemBundleSerializer(serializers.ModelSerializer):
@@ -207,7 +207,8 @@ class QuestionSerializer(I18nAwareModelSerializer):
     class Meta:
         model = Question
         fields = ('id', 'question', 'type', 'required', 'items', 'options', 'position',
-                  'ask_during_checkin', 'identifier', 'dependency_question', 'dependency_value')
+                  'ask_during_checkin', 'identifier', 'dependency_question', 'dependency_value',
+                  'hidden')
 
     def validate_identifier(self, value):
         Question._clean_identifier(self.context['event'], value, self.instance)

src/pretix/api/serializers/order.py

@@ -14,8 +14,8 @@ from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.i18n import language
 from pretix.base.models import (
-    Checkin, Invoice, InvoiceAddress, InvoiceLine, Order, OrderPosition,
-    Question, QuestionAnswer,
+    Checkin, Invoice, InvoiceAddress, InvoiceLine, Item, ItemVariation, Order,
+    OrderPosition, Question, QuestionAnswer, SubEvent,
 )
 from pretix.base.models.orders import (
     CartPosition, OrderFee, OrderPayment, OrderRefund,
@@ -179,6 +179,55 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
             self.fields.pop('pdf_data')
 
 
+class RequireAttentionField(serializers.Field):
+    def to_representation(self, instance: OrderPosition):
+        return instance.order.checkin_attention or instance.item.checkin_attention
+
+
+class AttendeeNameField(serializers.Field):
+    def to_representation(self, instance: OrderPosition):
+        an = instance.attendee_name
+        if not an:
+            if instance.addon_to_id:
+                an = instance.addon_to.attendee_name
+        if not an:
+            try:
+                an = instance.order.invoice_address.name
+            except InvoiceAddress.DoesNotExist:
+                pass
+        return an
+
+
+class AttendeeNamePartsField(serializers.Field):
+    def to_representation(self, instance: OrderPosition):
+        an = instance.attendee_name
+        p = instance.attendee_name_parts
+        if not an:
+            if instance.addon_to_id:
+                an = instance.addon_to.attendee_name
+                p = instance.addon_to.attendee_name_parts
+        if not an:
+            try:
+                p = instance.order.invoice_address.name_parts
+            except InvoiceAddress.DoesNotExist:
+                pass
+        return p
+
+
+class CheckinListOrderPositionSerializer(OrderPositionSerializer):
+    require_attention = RequireAttentionField(source='*')
+    attendee_name = AttendeeNameField(source='*')
+    attendee_name_parts = AttendeeNamePartsField(source='*')
+    order__status = serializers.SlugRelatedField(read_only=True, slug_field='status', source='order')
+
+    class Meta:
+        model = OrderPosition
+        fields = ('id', 'order', 'positionid', 'item', 'variation', 'price', 'attendee_name', 'attendee_name_parts',
+                  'attendee_email', 'voucher', 'tax_rate', 'tax_value', 'secret', 'addon_to', 'subevent', 'checkins',
+                  'downloads', 'answers', 'tax_rule', 'pseudonymization_id', 'pdf_data', 'require_attention',
+                  'order__status')
+
+
 class OrderPaymentTypeField(serializers.Field):
     # TODO: Remove after pretix 2.2
     def to_representation(self, instance: Order):
@@ -288,6 +337,23 @@ class OrderSerializer(I18nAwareModelSerializer):
         return instance
 
 
+class PriceCalcSerializer(serializers.Serializer):
+    item = serializers.PrimaryKeyRelatedField(queryset=Item.objects.none(), required=False, allow_null=True)
+    variation = serializers.PrimaryKeyRelatedField(queryset=ItemVariation.objects.none(), required=False, allow_null=True)
+    subevent = serializers.PrimaryKeyRelatedField(queryset=SubEvent.objects.none(), required=False, allow_null=True)
+    locale = serializers.CharField(allow_null=True, required=False)
+
+    def __init__(self, *args, **kwargs):
+        event = kwargs.pop('event')
+        super().__init__(*args, **kwargs)
+        self.fields['item'].queryset = event.items.all()
+        self.fields['variation'].queryset = ItemVariation.objects.filter(item__event=event)
+        if event.has_subevents:
+            self.fields['subevent'].queryset = event.subevents.all()
+        else:
+            del self.fields['subevent']
+
+
 class AnswerCreateSerializer(I18nAwareModelSerializer):
 
     class Meta:
@@ -457,11 +523,13 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
     payment_provider = serializers.CharField(required=True)
     payment_info = CompatibleJSONField(required=False)
     consume_carts = serializers.ListField(child=serializers.CharField(), required=False)
+    force = serializers.BooleanField(default=False, required=False)
+    payment_date = serializers.DateTimeField(required=False, allow_null=True)
 
     class Meta:
         model = Order
         fields = ('code', 'status', 'testmode', 'email', 'locale', 'payment_provider', 'fees', 'comment', 'sales_channel',
-                  'invoice_address', 'positions', 'checkin_attention', 'payment_info', 'consume_carts')
+                  'invoice_address', 'positions', 'checkin_attention', 'payment_info', 'payment_date', 'consume_carts', 'force')
 
     def validate_payment_provider(self, pp):
         if pp not in self.context['event'].get_payment_providers():
@@ -532,6 +600,8 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
         positions_data = validated_data.pop('positions') if 'positions' in validated_data else []
         payment_provider = validated_data.pop('payment_provider')
         payment_info = validated_data.pop('payment_info', '{}')
+        payment_date = validated_data.pop('payment_date', now())
+        force = validated_data.pop('force', False)
 
         if 'invoice_address' in validated_data:
             iadata = validated_data.pop('invoice_address')
@@ -565,29 +635,30 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
 
             errs = [{} for p in positions_data]
 
-            for i, pos_data in enumerate(positions_data):
-                new_quotas = (pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
-                              if pos_data.get('variation')
-                              else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent')))
-                if len(new_quotas) == 0:
-                    errs[i]['item'] = [ugettext_lazy('The product "{}" is not assigned to a quota.').format(
-                        str(pos_data.get('item'))
-                    )]
-                else:
-                    for quota in new_quotas:
-                        if quota not in quota_avail_cache:
-                            quota_avail_cache[quota] = list(quota.availability())
+            if not force:
+                for i, pos_data in enumerate(positions_data):
+                    new_quotas = (pos_data.get('variation').quotas.filter(subevent=pos_data.get('subevent'))
+                                  if pos_data.get('variation')
+                                  else pos_data.get('item').quotas.filter(subevent=pos_data.get('subevent')))
+                    if len(new_quotas) == 0:
+                        errs[i]['item'] = [ugettext_lazy('The product "{}" is not assigned to a quota.').format(
+                            str(pos_data.get('item'))
+                        )]
+                    else:
+                        for quota in new_quotas:
+                            if quota not in quota_avail_cache:
+                                quota_avail_cache[quota] = list(quota.availability())
 
-                        if quota_avail_cache[quota][1] is not None:
-                            quota_avail_cache[quota][1] -= 1
-                            if quota_avail_cache[quota][1] < 0:
-                                errs[i]['item'] = [
-                                    ugettext_lazy('There is not enough quota available on quota "{}" to perform the operation.').format(
-                                        quota.name
-                                    )
-                                ]
+                            if quota_avail_cache[quota][1] is not None:
+                                quota_avail_cache[quota][1] -= 1
+                                if quota_avail_cache[quota][1] < 0:
+                                    errs[i]['item'] = [
+                                        ugettext_lazy('There is not enough quota available on quota "{}" to perform the operation.').format(
+                                            quota.name
+                                        )
+                                    ]
 
-                quotadiff.update(new_quotas)
+                    quotadiff.update(new_quotas)
 
             if any(errs):
                 raise ValidationError({'positions': errs})
@@ -614,7 +685,7 @@ class OrderCreateSerializer(I18nAwareModelSerializer):
                     amount=order.total,
                     provider=payment_provider,
                     info=payment_info,
-                    payment_date=now(),
+                    payment_date=payment_date,
                     state=OrderPayment.PAYMENT_STATE_CONFIRMED
                 )
             elif payment_provider:

src/pretix/api/signals.py

@@ -3,7 +3,7 @@ from datetime import timedelta
 from django.dispatch import Signal, receiver
 from django.utils.timezone import now
 
-from pretix.api.models import WebHookCall
+from pretix.api.models import ApiCall, WebHookCall
 from pretix.base.signals import periodic_task
 
 register_webhook_events = Signal(
@@ -19,3 +19,8 @@ instances.
 @receiver(periodic_task)
 def cleanup_webhook_logs(sender, **kwargs):
     WebHookCall.objects.filter(datetime__lte=now() - timedelta(days=30)).delete()
+
+
+@receiver(periodic_task)
+def cleanup_api_logs(sender, **kwargs):
+    ApiCall.objects.filter(created__lte=now() - timedelta(hours=24)).delete()

src/pretix/api/views/__init__.py

@@ -31,10 +31,10 @@ class RichOrderingFilter(OrderingFilter):
 class ConditionalListView:
 
     def list(self, request, **kwargs):
-        if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE')
+        if_modified_since = request.headers.get('If-Modified-Since')
         if if_modified_since:
             if_modified_since = parse_http_date_safe(if_modified_since)
-        if_unmodified_since = request.META.get('HTTP_IF_UNMODIFIED_SINCE')
+        if_unmodified_since = request.headers.get('If-Unmodified-Since')
         if if_unmodified_since:
             if_unmodified_since = parse_http_date_safe(if_unmodified_since)
         if not hasattr(request, 'event'):

src/pretix/api/views/checkin.py

@@ -7,13 +7,13 @@ from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from rest_framework import viewsets
-from rest_framework.decorators import detail_route
+from rest_framework.decorators import action
 from rest_framework.fields import DateTimeField
 from rest_framework.response import Response
 
 from pretix.api.serializers.checkin import CheckinListSerializer
 from pretix.api.serializers.item import QuestionSerializer
-from pretix.api.serializers.order import OrderPositionSerializer
+from pretix.api.serializers.order import CheckinListOrderPositionSerializer
 from pretix.api.views import RichOrderingFilter
 from pretix.api.views.order import OrderPositionFilter
 from pretix.base.models import (
@@ -77,7 +77,7 @@ class CheckinListViewSet(viewsets.ModelViewSet):
         )
         super().perform_destroy(instance)
 
-    @detail_route(methods=['GET'])
+    @action(detail=True, methods=['GET'])
     def status(self, *args, **kwargs):
         clist = self.get_object()
         cqs = Checkin.objects.filter(
@@ -153,7 +153,7 @@ class CheckinOrderPositionFilter(OrderPositionFilter):
 
 
 class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
-    serializer_class = OrderPositionSerializer
+    serializer_class = CheckinListOrderPositionSerializer
     queryset = OrderPosition.objects.none()
     filter_backends = (DjangoFilterBackend, RichOrderingFilter)
     ordering = ('attendee_name_cached', 'positionid')
@@ -189,7 +189,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
         except ValueError:
             raise Http404()
 
-    def get_queryset(self):
+    def get_queryset(self, ignore_status=False):
         cqs = Checkin.objects.filter(
             position_id=OuterRef('pk'),
             list_id=self.checkinlist.pk
@@ -199,11 +199,15 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
 
         qs = OrderPosition.objects.filter(
             order__event=self.request.event,
-            order__status__in=[Order.STATUS_PAID, Order.STATUS_PENDING] if self.checkinlist.include_pending else [Order.STATUS_PAID],
             subevent=self.checkinlist.subevent
         ).annotate(
             last_checked_in=Subquery(cqs)
         )
+
+        if self.request.query_params.get('ignore_status', 'false') != 'true' and not ignore_status:
+            qs = qs.filter(
+                order__status__in=[Order.STATUS_PAID, Order.STATUS_PENDING] if self.checkinlist.include_pending else [Order.STATUS_PAID]
+            )
         if self.request.query_params.get('pdf_data', 'false') == 'true':
             qs = qs.prefetch_related(
                 Prefetch(
@@ -225,7 +229,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                     )
                 ))
             ).select_related(
-                'item', 'variation', 'item__category', 'addon_to'
+                'item', 'variation', 'item__category', 'addon_to', 'order', 'order__invoice_address'
             )
         else:
             qs = qs.prefetch_related(
@@ -235,19 +239,19 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                 ),
                 'answers', 'answers__options', 'answers__question',
                 Prefetch('addons', OrderPosition.objects.select_related('item', 'variation'))
-            ).select_related('item', 'variation', 'order', 'addon_to', 'order__invoice_address')
+            ).select_related('item', 'variation', 'order', 'addon_to', 'order__invoice_address', 'order')
 
         if not self.checkinlist.all_products:
             qs = qs.filter(item__in=self.checkinlist.limit_products.values_list('id', flat=True))
 
         return qs
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def redeem(self, *args, **kwargs):
         force = bool(self.request.data.get('force', False))
         ignore_unpaid = bool(self.request.data.get('ignore_unpaid', False))
         nonce = self.request.data.get('nonce')
-        op = self.get_object()
+        op = self.get_object(ignore_status=True)
 
         if 'datetime' in self.request.data:
             dt = DateTimeField().to_internal_value(self.request.data.get('datetime'))
@@ -281,7 +285,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
             return Response({
                 'status': 'incomplete',
                 'require_attention': op.item.checkin_attention or op.order.checkin_attention,
-                'position': OrderPositionSerializer(op, context=self.get_serializer_context()).data,
+                'position': CheckinListOrderPositionSerializer(op, context=self.get_serializer_context()).data,
                 'questions': [
                     QuestionSerializer(q).data for q in e.questions
                 ]
@@ -291,17 +295,17 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                 'status': 'error',
                 'reason': e.code,
                 'require_attention': op.item.checkin_attention or op.order.checkin_attention,
-                'position': OrderPositionSerializer(op, context=self.get_serializer_context()).data
+                'position': CheckinListOrderPositionSerializer(op, context=self.get_serializer_context()).data
             }, status=400)
         else:
             return Response({
                 'status': 'ok',
                 'require_attention': op.item.checkin_attention or op.order.checkin_attention,
-                'position': OrderPositionSerializer(op, context=self.get_serializer_context()).data
+                'position': CheckinListOrderPositionSerializer(op, context=self.get_serializer_context()).data
             }, status=201)
 
-    def get_object(self):
-        queryset = self.filter_queryset(self.get_queryset())
+    def get_object(self, ignore_status=False):
+        queryset = self.filter_queryset(self.get_queryset(ignore_status=ignore_status))
         if self.kwargs['pk'].isnumeric():
             obj = get_object_or_404(queryset, Q(pk=self.kwargs['pk']) | Q(secret=self.kwargs['pk']))
         else:

src/pretix/api/views/device.py

@@ -105,7 +105,7 @@ class RevokeKeyView(APIView):
 
     def post(self, request, format=None):
         device = request.auth
-        device.api_token = None
+        device.revoked = True
         device.save()
         device.log_action('pretix.device.revoked', auth=device)
 

src/pretix/api/views/event.py

@@ -13,7 +13,7 @@ from pretix.api.serializers.event import (
 )
 from pretix.api.views import ConditionalListView
 from pretix.base.models import (
-    Device, Event, ItemCategory, TaxRule, TeamAPIToken,
+    CartPosition, Device, Event, ItemCategory, TaxRule, TeamAPIToken,
 )
 from pretix.base.models.event import SubEvent
 from pretix.helpers.dicts import merge_dicts
@@ -72,6 +72,8 @@ class EventViewSet(viewsets.ModelViewSet):
     lookup_url_kwarg = 'event'
     permission_classes = (EventCRUDPermission,)
     filter_backends = (DjangoFilterBackend, filters.OrderingFilter)
+    ordering = ('slug',)
+    ordering_fields = ('date_from', 'slug')
     filterset_class = EventFilter
 
     def get_queryset(self):
@@ -272,6 +274,8 @@ class SubEventViewSet(ConditionalListView, viewsets.ModelViewSet):
                     auth=self.request.auth,
                     data=self.request.data
                 )
+                CartPosition.objects.filter(addon_to__subevent=instance).delete()
+                instance.cartposition_set.all().delete()
                 super().perform_destroy(instance)
         except ProtectedError:
             raise PermissionDenied('The sub-event could not be deleted as some constraints (e.g. data created by '

src/pretix/api/views/item.py

@@ -4,7 +4,7 @@ from django.shortcuts import get_object_or_404
 from django.utils.functional import cached_property
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from rest_framework import viewsets
-from rest_framework.decorators import detail_route
+from rest_framework.decorators import action
 from rest_framework.exceptions import PermissionDenied
 from rest_framework.filters import OrderingFilter
 from rest_framework.response import Response
@@ -16,8 +16,8 @@ from pretix.api.serializers.item import (
 )
 from pretix.api.views import ConditionalListView
 from pretix.base.models import (
-    Item, ItemAddOn, ItemBundle, ItemCategory, ItemVariation, Question,
-    QuestionOption, Quota,
+    CartPosition, Item, ItemAddOn, ItemBundle, ItemCategory, ItemVariation,
+    Question, QuestionOption, Quota,
 )
 from pretix.helpers.dicts import merge_dicts
 
@@ -84,7 +84,8 @@ class ItemViewSet(ConditionalListView, viewsets.ModelViewSet):
             user=self.request.user,
             auth=self.request.auth,
         )
-        self.get_object().cartposition_set.all().delete()
+        CartPosition.objects.filter(addon_to__item=instance).delete()
+        instance.cartposition_set.all().delete()
         super().perform_destroy(instance)
 
 
@@ -498,7 +499,7 @@ class QuotaViewSet(ConditionalListView, viewsets.ModelViewSet):
             )
         super().perform_destroy(instance)
 
-    @detail_route(methods=['get'])
+    @action(detail=True, methods=['get'])
     def availability(self, request, *args, **kwargs):
         quota = self.get_object()
 

src/pretix/api/views/order.py

@@ -12,7 +12,7 @@ from django.utils.timezone import make_aware, now
 from django.utils.translation import ugettext as _
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from rest_framework import mixins, serializers, status, viewsets
-from rest_framework.decorators import detail_route
+from rest_framework.decorators import action
 from rest_framework.exceptions import (
     APIException, NotFound, PermissionDenied, ValidationError,
 )
@@ -24,14 +24,16 @@ from pretix.api.models import OAuthAccessToken
 from pretix.api.serializers.order import (
     InvoiceSerializer, OrderCreateSerializer, OrderPaymentSerializer,
     OrderPositionSerializer, OrderRefundCreateSerializer,
-    OrderRefundSerializer, OrderSerializer,
+    OrderRefundSerializer, OrderSerializer, PriceCalcSerializer,
 )
+from pretix.base.i18n import language
 from pretix.base.models import (
-    CachedCombinedTicket, CachedTicket, Device, Event, Invoice, Order,
-    OrderPayment, OrderPosition, OrderRefund, Quota, TeamAPIToken,
+    CachedCombinedTicket, CachedTicket, Device, Event, Invoice, InvoiceAddress,
+    Order, OrderPayment, OrderPosition, OrderRefund, Quota, TeamAPIToken,
     generate_position_secret, generate_secret,
 )
 from pretix.base.payment import PaymentException
+from pretix.base.services import tickets
 from pretix.base.services.invoices import (
     generate_cancellation, generate_invoice, invoice_pdf, invoice_qualified,
     regenerate_invoice,
@@ -41,8 +43,12 @@ from pretix.base.services.orders import (
     OrderChangeManager, OrderError, approve_order, cancel_order, deny_order,
     extend_order, mark_order_expired, mark_order_refunded,
 )
+from pretix.base.services.pricing import get_price
 from pretix.base.services.tickets import generate
-from pretix.base.signals import order_placed, register_ticket_outputs
+from pretix.base.signals import (
+    order_modified, order_placed, register_ticket_outputs,
+)
+from pretix.base.templatetags.money import money_filter
 
 
 class OrderFilter(FilterSet):
@@ -50,6 +56,7 @@ class OrderFilter(FilterSet):
     code = django_filters.CharFilter(field_name='code', lookup_expr='iexact')
     status = django_filters.CharFilter(field_name='status', lookup_expr='iexact')
     modified_since = django_filters.IsoDateTimeFilter(field_name='last_modified', lookup_expr='gte')
+    created_since = django_filters.IsoDateTimeFilter(field_name='datetime', lookup_expr='gte')
 
     class Meta:
         model = Order
@@ -124,7 +131,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         serializer = self.get_serializer(queryset, many=True)
         return Response(serializer.data, headers={'X-Page-Generated': date})
 
-    @detail_route(url_name='download', url_path='download/(?P<output>[^/]+)')
+    @action(detail=True, url_name='download', url_path='download/(?P<output>[^/]+)')
     def download(self, request, output, **kwargs):
         provider = self._get_output_provider(output)
         order = self.get_object()
@@ -146,7 +153,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             )
             return resp
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def mark_paid(self, request, **kwargs):
         order = self.get_object()
 
@@ -187,7 +194,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             status=status.HTTP_400_BAD_REQUEST
         )
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def mark_canceled(self, request, **kwargs):
         send_mail = request.data.get('send_email', True)
         cancellation_fee = request.data.get('cancellation_fee', None)
@@ -221,7 +228,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             )
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def approve(self, request, **kwargs):
         send_mail = request.data.get('send_email', True)
 
@@ -239,7 +246,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             return Response({'detail': str(e)}, status=status.HTTP_400_BAD_REQUEST)
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def deny(self, request, **kwargs):
         send_mail = request.data.get('send_email', True)
         comment = request.data.get('comment', '')
@@ -257,7 +264,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             return Response({'detail': str(e)}, status=status.HTTP_400_BAD_REQUEST)
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def mark_pending(self, request, **kwargs):
         order = self.get_object()
 
@@ -276,7 +283,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         )
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def mark_expired(self, request, **kwargs):
         order = self.get_object()
 
@@ -293,7 +300,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         )
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def mark_refunded(self, request, **kwargs):
         order = self.get_object()
 
@@ -310,7 +317,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         )
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def create_invoice(self, request, **kwargs):
         order = self.get_object()
         has_inv = order.invoices.exists() and not (
@@ -342,7 +349,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             status=status.HTTP_201_CREATED
         )
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def resend_link(self, request, **kwargs):
         order = self.get_object()
         if not order.email:
@@ -356,7 +363,7 @@ class OrderViewSet(viewsets.ModelViewSet):
             status=status.HTTP_204_NO_CONTENT
         )
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     @transaction.atomic
     def regenerate_secrets(self, request, **kwargs):
         order = self.get_object()
@@ -367,6 +374,8 @@ class OrderViewSet(viewsets.ModelViewSet):
         order.save(update_fields=['secret'])
         CachedTicket.objects.filter(order_position__order=order).delete()
         CachedCombinedTicket.objects.filter(order=order).delete()
+        tickets.invalidate_cache.apply_async(kwargs={'event': self.request.event.pk,
+                                                     'order': order.pk})
         order.log_action(
             'pretix.event.order.secret.changed',
             user=self.request.user,
@@ -374,7 +383,7 @@ class OrderViewSet(viewsets.ModelViewSet):
         )
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def extend(self, request, **kwargs):
         new_date = request.data.get('expires', None)
         force = request.data.get('force', False)
@@ -450,61 +459,66 @@ class OrderViewSet(viewsets.ModelViewSet):
             )
         return super().update(request, *args, **kwargs)
 
-    @transaction.atomic
     def perform_update(self, serializer):
-        if 'comment' in self.request.data and serializer.instance.comment != self.request.data.get('comment'):
-            serializer.instance.log_action(
-                'pretix.event.order.comment',
-                user=self.request.user,
-                auth=self.request.auth,
-                data={
-                    'new_comment': self.request.data.get('comment')
-                }
-            )
+        with transaction.atomic():
+            if 'comment' in self.request.data and serializer.instance.comment != self.request.data.get('comment'):
+                serializer.instance.log_action(
+                    'pretix.event.order.comment',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'new_comment': self.request.data.get('comment')
+                    }
+                )
 
-        if 'checkin_attention' in self.request.data and serializer.instance.checkin_attention != self.request.data.get('checkin_attention'):
-            serializer.instance.log_action(
-                'pretix.event.order.checkin_attention',
-                user=self.request.user,
-                auth=self.request.auth,
-                data={
-                    'new_value': self.request.data.get('checkin_attention')
-                }
-            )
+            if 'checkin_attention' in self.request.data and serializer.instance.checkin_attention != self.request.data.get('checkin_attention'):
+                serializer.instance.log_action(
+                    'pretix.event.order.checkin_attention',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'new_value': self.request.data.get('checkin_attention')
+                    }
+                )
 
-        if 'email' in self.request.data and serializer.instance.email != self.request.data.get('email'):
-            serializer.instance.log_action(
-                'pretix.event.order.contact.changed',
-                user=self.request.user,
-                auth=self.request.auth,
-                data={
-                    'old_email': serializer.instance.email,
-                    'new_email': self.request.data.get('email'),
-                }
-            )
+            if 'email' in self.request.data and serializer.instance.email != self.request.data.get('email'):
+                serializer.instance.email_known_to_work = False
+                serializer.instance.log_action(
+                    'pretix.event.order.contact.changed',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'old_email': serializer.instance.email,
+                        'new_email': self.request.data.get('email'),
+                    }
+                )
 
-        if 'locale' in self.request.data and serializer.instance.locale != self.request.data.get('locale'):
-            serializer.instance.log_action(
-                'pretix.event.order.locale.changed',
-                user=self.request.user,
-                auth=self.request.auth,
-                data={
-                    'old_locale': serializer.instance.locale,
-                    'new_locale': self.request.data.get('locale'),
-                }
-            )
+            if 'locale' in self.request.data and serializer.instance.locale != self.request.data.get('locale'):
+                serializer.instance.log_action(
+                    'pretix.event.order.locale.changed',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'old_locale': serializer.instance.locale,
+                        'new_locale': self.request.data.get('locale'),
+                    }
+                )
+
+            if 'invoice_address' in self.request.data:
+                serializer.instance.log_action(
+                    'pretix.event.order.modified',
+                    user=self.request.user,
+                    auth=self.request.auth,
+                    data={
+                        'invoice_data': self.request.data.get('invoice_address'),
+                    }
+                )
+
+            serializer.save()
+            tickets.invalidate_cache.apply_async(kwargs={'event': serializer.instance.event.pk, 'order': serializer.instance.pk})
 
         if 'invoice_address' in self.request.data:
-            serializer.instance.log_action(
-                'pretix.event.order.modified',
-                user=self.request.user,
-                auth=self.request.auth,
-                data={
-                    'invoice_data': self.request.data.get('invoice_address'),
-                }
-            )
-
-        serializer.save()
+            order_modified.send(sender=serializer.instance.event, order=serializer.instance)
 
     def perform_create(self, serializer):
         serializer.save()
@@ -613,7 +627,84 @@ class OrderPositionViewSet(mixins.DestroyModelMixin, viewsets.ReadOnlyModelViewS
                 return prov
         raise NotFound('Unknown output provider.')
 
-    @detail_route(url_name='download', url_path='download/(?P<output>[^/]+)')
+    @action(detail=True, methods=['POST'], url_name='price_calc')
+    def price_calc(self, request, *args, **kwargs):
+        """
+        This calculates the price assuming a change of product or subevent. This endpoint
+        is deliberately not documented and considered a private API, only to be used by
+        pretix' web interface.
+
+        Sample input:
+
+        {
+            "item": 2,
+            "variation": null,
+            "subevent": 3
+        }
+
+        Sample output:
+
+        {
+            "gross": "2.34",
+            "gross_formatted": "2,34",
+            "net": "2.34",
+            "tax": "0.00",
+            "rate": "0.00",
+            "name": "VAT"
+        }
+        """
+        serializer = PriceCalcSerializer(data=request.data, event=request.event)
+        serializer.is_valid(raise_exception=True)
+        data = serializer.validated_data
+        pos = self.get_object()
+
+        try:
+            ia = pos.order.invoice_address
+        except InvoiceAddress.DoesNotExist:
+            ia = InvoiceAddress()
+
+        kwargs = {
+            'item': pos.item,
+            'variation': pos.variation,
+            'voucher': pos.voucher,
+            'subevent': pos.subevent,
+            'addon_to': pos.addon_to,
+            'invoice_address': ia,
+        }
+
+        if data.get('item'):
+            item = data.get('item')
+            kwargs['item'] = item
+
+            if item.has_variations:
+                variation = data.get('variation') or pos.variation
+                if not variation:
+                    raise ValidationError('No variation given')
+                if variation.item != item:
+                    raise ValidationError('Variation does not belong to item')
+                kwargs['variation'] = variation
+            else:
+                variation = None
+                kwargs['variation'] = None
+
+            if pos.voucher and not pos.voucher.applies_to(item, variation):
+                kwargs['voucher'] = None
+
+        if data.get('subevent'):
+            kwargs['subevent'] = data.get('subevent')
+
+        price = get_price(**kwargs)
+        with language(data.get('locale') or self.request.event.settings.locale):
+            return Response({
+                'gross': price.gross,
+                'gross_formatted': money_filter(price.gross, self.request.event.currency, hide_currency=True),
+                'net': price.net,
+                'rate': price.rate,
+                'name': str(price.name),
+                'tax': price.tax,
+            })
+
+    @action(detail=True, url_name='download', url_path='download/(?P<output>[^/]+)')
     def download(self, request, output, **kwargs):
         provider = self._get_output_provider(output)
         pos = self.get_object()
@@ -664,7 +755,7 @@ class PaymentViewSet(viewsets.ReadOnlyModelViewSet):
         order = get_object_or_404(Order, code=self.kwargs['order'], event=self.request.event)
         return order.payments.all()
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def confirm(self, request, **kwargs):
         payment = self.get_object()
         force = request.data.get('force', False)
@@ -685,7 +776,7 @@ class PaymentViewSet(viewsets.ReadOnlyModelViewSet):
             pass
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def refund(self, request, **kwargs):
         payment = self.get_object()
         amount = serializers.DecimalField(max_digits=10, decimal_places=2).to_internal_value(
@@ -750,7 +841,7 @@ class PaymentViewSet(viewsets.ReadOnlyModelViewSet):
                     payment.order.save(update_fields=['status', 'expires'])
             return Response(OrderRefundSerializer(r).data, status=status.HTTP_200_OK)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def cancel(self, request, **kwargs):
         payment = self.get_object()
 
@@ -778,7 +869,7 @@ class RefundViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
         order = get_object_or_404(Order, code=self.kwargs['order'], event=self.request.event)
         return order.refunds.all()
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def cancel(self, request, **kwargs):
         refund = self.get_object()
 
@@ -795,7 +886,7 @@ class RefundViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
             }, user=self.request.user if self.request.user.is_authenticated else None, auth=self.request.auth)
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def process(self, request, **kwargs):
         refund = self.get_object()
 
@@ -820,7 +911,7 @@ class RefundViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
             refund.order.save(update_fields=['status', 'expires'])
         return self.retrieve(request, [], **kwargs)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def done(self, request, **kwargs):
         refund = self.get_object()
 
@@ -910,7 +1001,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
             nr=Concat('prefix', 'invoice_no')
         )
 
-    @detail_route()
+    @action(detail=True, )
     def download(self, request, **kwargs):
         invoice = self.get_object()
 
@@ -928,7 +1019,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
         resp['Content-Disposition'] = 'attachment; filename="{}.pdf"'.format(invoice.number)
         return resp
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def regenerate(self, request, **kwarts):
         inv = self.get_object()
         if inv.canceled:
@@ -947,7 +1038,7 @@ class InvoiceViewSet(viewsets.ReadOnlyModelViewSet):
             )
             return Response(status=204)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def reissue(self, request, **kwarts):
         inv = self.get_object()
         if inv.canceled:

src/pretix/api/views/organizer.py

@@ -1,4 +1,4 @@
-from rest_framework import viewsets
+from rest_framework import filters, viewsets
 
 from pretix.api.models import OAuthAccessToken
 from pretix.api.serializers.organizer import OrganizerSerializer
@@ -10,6 +10,9 @@ class OrganizerViewSet(viewsets.ReadOnlyModelViewSet):
     queryset = Organizer.objects.none()
     lookup_field = 'slug'
     lookup_url_kwarg = 'organizer'
+    filter_backends = (filters.OrderingFilter,)
+    ordering = ('slug',)
+    ordering_fields = ('name', 'slug')
 
     def get_queryset(self):
         if self.request.user.is_authenticated:

src/pretix/api/views/voucher.py

@@ -7,7 +7,7 @@ from django_filters.rest_framework import (
     BooleanFilter, DjangoFilterBackend, FilterSet,
 )
 from rest_framework import status, viewsets
-from rest_framework.decorators import list_route
+from rest_framework.decorators import action
 from rest_framework.exceptions import PermissionDenied
 from rest_framework.filters import OrderingFilter
 from rest_framework.response import Response
@@ -111,9 +111,12 @@ class VoucherViewSet(viewsets.ModelViewSet):
             user=self.request.user,
             auth=self.request.auth,
         )
-        super().perform_destroy(instance)
+        with transaction.atomic():
+            instance.cartposition_set.filter(addon_to__isnull=False).delete()
+            instance.cartposition_set.all().delete()
+            super().perform_destroy(instance)
 
-    @list_route(methods=['POST'])
+    @action(detail=False, methods=['POST'])
     def batch_create(self, request, *args, **kwargs):
         if any(self._predict_quota_check(d, None) for d in request.data):
             lockfn = request.event.lock

src/pretix/api/views/waitinglist.py

@@ -1,7 +1,7 @@
 import django_filters
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from rest_framework import viewsets
-from rest_framework.decorators import detail_route
+from rest_framework.decorators import action
 from rest_framework.exceptions import PermissionDenied, ValidationError
 from rest_framework.filters import OrderingFilter
 from rest_framework.response import Response
@@ -69,7 +69,7 @@ class WaitingListViewSet(viewsets.ModelViewSet):
         )
         super().perform_destroy(instance)
 
-    @detail_route(methods=['POST'])
+    @action(detail=True, methods=['POST'])
     def send_voucher(self, *args, **kwargs):
         try:
             self.get_object().send_voucher(

src/pretix/base/email.py

@@ -8,7 +8,7 @@ from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
 from inlinestyler.utils import inline_css
 
-from pretix.base.models import Event, Order
+from pretix.base.models import Event, Order, OrderPosition
 from pretix.base.signals import register_html_mail_renderers
 from pretix.base.templatetags.rich_text import markdown_compile_email
 
@@ -44,7 +44,8 @@ class BaseHTMLMailRenderer:
     def __str__(self):
         return self.identifier
 
-    def render(self, plain_body: str, plain_signature: str, subject: str, order: Order=None) -> str:
+    def render(self, plain_body: str, plain_signature: str, subject: str, order: Order=None,
+               position: OrderPosition=None) -> str:
         """
         This method should generate the HTML part of the email.
 
@@ -52,6 +53,7 @@ class BaseHTMLMailRenderer:
         :param plain_signature: The signature with event organizer contact details in plain text.
         :param subject: The email subject.
         :param order: The order if this email is connected to one, otherwise ``None``.
+        :param position: The order position if this email is connected to one, otherwise ``None``.
         :return: An HTML string
         """
         raise NotImplementedError()
@@ -95,7 +97,7 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
     def template_name(self):
         raise NotImplementedError()
 
-    def render(self, plain_body: str, plain_signature: str, subject: str, order: Order) -> str:
+    def render(self, plain_body: str, plain_signature: str, subject: str, order: Order, position: OrderPosition) -> str:
         body_md = markdown_compile_email(plain_body)
         htmlctx = {
             'site': settings.PRETIX_INSTANCE_NAME,
@@ -116,6 +118,9 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
         if order:
             htmlctx['order'] = order
 
+        if position:
+            htmlctx['position'] = position
+
         tpl = get_template(self.template_name)
         body_html = inline_css(tpl.render(htmlctx))
         return body_html

src/pretix/base/exporters/__init__.py

@@ -1,4 +1,5 @@
 from .answers import *  # noqa
+from .dekodi import *  # noqa
 from .invoices import *  # noqa
 from .json import *  # noqa
 from .mail import *  # noqa

src/pretix/base/exporters/answers.py

@@ -40,6 +40,7 @@ class AnswerFilesExporter(BaseExporter):
         if form_data.get('questions'):
             qs = qs.filter(question__in=form_data['questions'])
         with tempfile.TemporaryDirectory() as d:
+            any = False
             with ZipFile(os.path.join(d, 'tmp.zip'), 'w') as zipf:
                 for i in qs:
                     if i.file:
@@ -51,9 +52,12 @@ class AnswerFilesExporter(BaseExporter):
                             i.question.pk,
                             os.path.basename(i.file.name).split('.', 1)[1]
                         )
+                        any = True
                         zipf.writestr(fname, i.file.read())
                         i.file.close()
 
+            if not any:
+                return None
             with open(os.path.join(d, 'tmp.zip'), 'rb') as zipf:
                 return '{}_answers.zip'.format(self.event.slug), 'application/zip', zipf.read()
 

src/pretix/base/exporters/dekodi.py

@@ -0,0 +1,219 @@
+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 ugettext, ugettext_lazy
+
+from pretix.base.i18n import language
+from pretix.base.models import Invoice, OrderPayment
+
+from ..exporter import BaseExporter
+from ..signals import register_data_exporters
+
+
+class DekodiNREIExporter(BaseExporter):
+    identifier = 'dekodi_nrei'
+    verbose_name = 'dekodi NREI (JSON)'
+
+    # Specification: http://manuals.dekodi.de/nexuspub/schnittstellenbuch/
+
+    def _encode_invoice(self, invoice: Invoice):
+        p_last = invoice.order.payments.filter(state=[OrderPayment.PAYMENT_STATE_CONFIRMED, OrderPayment.PAYMENT_STATE_REFUNDED]).last()
+        gross_total = Decimal('0.00')
+        net_total = Decimal('0.00')
+
+        positions = []
+        for l in invoice.lines.all():
+            positions.append({
+                'ADes': l.description.replace("<br />", "\n"),
+                'ANetA': round(float((-1 if invoice.is_cancellation else 1) * l.net_value), 2),
+                'ANo': self.event.slug,
+                'AQ': -1 if invoice.is_cancellation else 1,
+                'AVatP': round(float(l.tax_rate), 2),
+                'DIDt': (l.subevent or invoice.order.event).date_from.isoformat().replace('Z', '+00:00'),
+                'PosGrossA': round(float(l.gross_value), 2),
+                'PosNetA': round(float(l.net_value), 2),
+            })
+            gross_total += l.gross_value
+            net_total += l.net_value
+
+        payments = []
+        paypal_email = None
+        for p in invoice.order.payments.filter(
+                state__in=(OrderPayment.PAYMENT_STATE_CONFIRMED, OrderPayment.PAYMENT_STATE_PENDING,
+                           OrderPayment.PAYMENT_STATE_CREATED, OrderPayment.PAYMENT_STATE_REFUNDED)
+        ):
+            if p.provider == 'paypal':
+                paypal_email = p.info_data.get('payer', {}).get('payer_info', {}).get('email')
+                try:
+                    ppid = p.info_data['transactions'][0]['related_resources'][0]['sale']['id']
+                except:
+                    ppid = p.info_data.get('id')
+                payments.append({
+                    'PTID': '1',
+                    'PTN': 'PayPal',
+                    'PTNo1': ppid,
+                    'PTNo2': p.info_data.get('id'),
+                    'PTNo7': round(float(p.amount), 2),
+                    'PTNo8': str(self.event.currency),
+                    'PTNo11': paypal_email or '',
+                    'PTNo15': p.full_id or '',
+                })
+            elif p.provider == 'banktransfer':
+                payments.append({
+                    'PTID': '4',
+                    'PTN': 'Vorkasse',
+                    'PTNo4': p.info_data.get('reference') or p.payment_provider._code(invoice.order),
+                    'PTNo7': round(float(p.amount), 2),
+                    'PTNo8': str(self.event.currency),
+                    'PTNo10': p.info_data.get('payer') or '',
+                    'PTNo14': p.info_data.get('date') or '',
+                    'PTNo15': p.full_id or '',
+                })
+            elif p.provider == 'sepadebit':
+                with language(invoice.order.locale):
+                    payments.append({
+                        'PTID': '5',
+                        'PTN': 'Lastschrift',
+                        'PTNo4': ugettext('Event ticket {event}-{code}').format(
+                            event=self.event.slug.upper(),
+                            code=invoice.order.code
+                        ),
+                        'PTNo5': p.info_data.get('iban') or '',
+                        'PTNo6': p.info_data.get('bic') or '',
+                        'PTNo7': round(float(p.amount), 2),
+                        'PTNo8': str(self.event.currency) or '',
+                        'PTNo9': p.info_data.get('date') or '',
+                        'PTNo10': p.info_data.get('account') or '',
+                        'PTNo14': p.info_data.get('reference') or '',
+                        'PTNo15': p.full_id or '',
+                    })
+            elif p.provider.startswith('stripe'):
+                src = p.info_data.get("source", p.info_data)
+                payments.append({
+                    'PTID': '81',
+                    'PTN': 'Stripe',
+                    'PTNo1': p.info_data.get("id") or '',
+                    'PTNo5': src.get("card", {}).get("last4") or '',
+                    'PTNo7': round(float(p.amount), 2) or '',
+                    'PTNo8': str(self.event.currency) or '',
+                    'PTNo10': src.get('owner', {}).get('verified_name') or src.get('owner', {}).get('name') or '',
+                    'PTNo15': p.full_id or '',
+                })
+            else:
+                payments.append({
+                    'PTID': '0',
+                    'PTN': p.provider,
+                    'PTNo7': round(float(p.amount), 2) or '',
+                    'PTNo8': str(self.event.currency) or '',
+                    'PTNo15': p.full_id or '',
+                })
+
+        payments = [
+            {
+                k: v for k, v in p.items() if v is not None
+            } for p in payments
+        ]
+
+        hdr = {
+            'C': str(invoice.invoice_to_country) or self.event.settings.invoice_address_from_country,
+            'CC': self.event.currency,
+            'City': invoice.invoice_to_city,
+            'CN': invoice.invoice_to_company,
+            'DIC': self.event.settings.invoice_address_from_country,
+            # DIC is  a little bit unclean, should be the event location's country
+            'DIDt': invoice.order.datetime.isoformat().replace('Z', '+00:00'),
+            'DT': '30' if invoice.is_cancellation else '10',
+            'EM': invoice.order.email,
+            'FamN': invoice.invoice_to_name.rsplit(' ', 1)[-1],
+            'FN': invoice.invoice_to_name.rsplit(' ', 1)[0] if ' ' in invoice.invoice_to_name else '',
+            'IDt': invoice.date.isoformat() + 'T08:00:00+01:00',
+            'INo': invoice.full_invoice_no,
+            'IsNet': invoice.reverse_charge,
+            'ODt': invoice.order.datetime.isoformat().replace('Z', '+00:00'),
+            'OID': invoice.order.code,
+            'SID': self.event.slug,
+            'SN': str(self.event),
+            'Str': invoice.invoice_to_street or '',
+            'TGrossA': round(float(gross_total), 2),
+            'TNetA': round(float(net_total), 2),
+            'TVatA': round(float(gross_total - net_total), 2),
+            'VatDp': False,
+            'Zip': invoice.invoice_to_zipcode
+        }
+        if not hdr['FamN'] and not hdr['CN']:
+            hdr['CN'] = "Unbekannter Kunde"
+
+        if invoice.refers:
+            hdr['PvrINo'] = invoice.refers.full_invoice_no
+        if p_last:
+            hdr['PmDt'] = p_last.payment_date.isoformat().replace('Z', '+00:00')
+        if paypal_email:
+            hdr['PPEm'] = paypal_email
+        if invoice.invoice_to_vat_id:
+            hdr['VatID'] = invoice.invoice_to_vat_id
+
+        return {
+            'IsValid': True,
+            'Hdr': hdr,
+            'InvcPstns': positions,
+            'PmIs': payments,
+            'ValidationMessage': ''
+        }
+
+    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)
+
+        jo = {
+            'Format': 'NREI',
+            'Version': '18.10.2.0',
+            'SourceSystem': 'pretix',
+            'Data': [
+                self._encode_invoice(i) for i in qs
+            ]
+        }
+        return '{}_nrei.json'.format(self.event.slug), 'application/json', json.dumps(jo, cls=DjangoJSONEncoder, indent=4)
+
+    @property
+    def export_form_fields(self):
+        return OrderedDict(
+            [
+                ('date_from',
+                 forms.DateField(
+                     label=ugettext_lazy('Start date'),
+                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+                     required=False,
+                     help_text=ugettext_lazy('Only include invoices issued on or after this date. Note that the invoice date does '
+                                             'not always correspond to the order or payment date.')
+                 )),
+                ('date_to',
+                 forms.DateField(
+                     label=ugettext_lazy('End date'),
+                     widget=forms.DateInput(attrs={'class': 'datepickerfield'}),
+                     required=False,
+                     help_text=ugettext_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.')
+                 )),
+            ]
+        )
+
+
+@receiver(register_data_exporters, dispatch_uid="exporter_dekodi_nrei")
+def register_dekodi_export(sender, **kwargs):
+    return DekodiNREIExporter

src/pretix/base/exporters/invoices.py

@@ -46,6 +46,7 @@ class InvoiceExporter(BaseExporter):
             qs = qs.filter(date__lte=date_value)
 
         with tempfile.TemporaryDirectory() as d:
+            any = False
             with ZipFile(os.path.join(d, 'tmp.zip'), 'w') as zipf:
                 for i in qs:
                     try:
@@ -54,14 +55,19 @@ class InvoiceExporter(BaseExporter):
                             i.refresh_from_db()
                         i.file.open('rb')
                         zipf.writestr('{}.pdf'.format(i.number), i.file.read())
+                        any = True
                         i.file.close()
                     except FileNotFoundError:
                         invoice_pdf_task.apply(args=(i.pk,))
                         i.refresh_from_db()
                         i.file.open('rb')
                         zipf.writestr('{}.pdf'.format(i.number), i.file.read())
+                        any = True
                         i.file.close()
 
+            if not any:
+                return None
+
             with open(os.path.join(d, 'tmp.zip'), 'rb') as zipf:
                 return '{}_invoices.zip'.format(self.event.slug), 'application/zip', zipf.read()
 

src/pretix/base/exporters/orderlist.py

@@ -6,7 +6,7 @@ from django import forms
 from django.db.models import DateTimeField, F, Max, OuterRef, Subquery, Sum
 from django.dispatch import receiver
 from django.utils.formats import date_format, localize
-from django.utils.translation import ugettext as _, ugettext_lazy
+from django.utils.translation import pgettext, ugettext as _, ugettext_lazy
 
 from pretix.base.models import (
     InvoiceAddress, InvoiceLine, Order, OrderPosition,
@@ -269,6 +269,10 @@ class OrderListExporter(MultiSheetListExporter):
             _('Status'),
             _('Email'),
             _('Order date'),
+        ]
+        if self.event.has_subevents:
+            headers.append(pgettext('subevent', 'Date'))
+        headers += [
             _('Product'),
             _('Variation'),
             _('Price'),
@@ -311,6 +315,10 @@ class OrderListExporter(MultiSheetListExporter):
                 order.get_status_display(),
                 order.email,
                 order.datetime.astimezone(tz).strftime('%Y-%m-%d'),
+            ]
+            if self.event.has_subevents:
+                row.append(op.subevent)
+            row += [
                 str(op.item),
                 str(op.variation) if op.variation else '',
                 op.price,

src/pretix/base/forms/questions.py

@@ -11,7 +11,9 @@ from django.contrib import messages
 from django.core.exceptions import ValidationError
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import get_language, ugettext_lazy as _
+from django_countries import countries
+from django_countries.fields import Country, CountryField
 
 from pretix.base.forms.widgets import (
     BusinessBooleanRadio, DatePickerWidget, SplitDateTimePickerWidget,
@@ -173,7 +175,6 @@ class BaseQuestionsForm(forms.Form):
                 initial = None
             tz = pytz.timezone(event.settings.timezone)
             help_text = rich_text(q.help_text)
-            default = q.default_value
             label = escape(q.question)  # django-bootstrap3 calls mark_safe
             required = q.required and not self.all_optional
             if q.type == Question.TYPE_BOOLEAN:
@@ -186,8 +187,6 @@ class BaseQuestionsForm(forms.Form):
 
                 if initial:
                     initialbool = (initial.answer == "True")
-                elif default:
-                    initialbool = (default == "True")
                 else:
                     initialbool = False
 
@@ -200,21 +199,29 @@ class BaseQuestionsForm(forms.Form):
                 field = forms.DecimalField(
                     label=label, required=required,
                     help_text=q.help_text,
-                    initial=initial.answer if initial else (default if default else None),
+                    initial=initial.answer if initial else None,
                     min_value=Decimal('0.00'),
                 )
             elif q.type == Question.TYPE_STRING:
                 field = forms.CharField(
                     label=label, required=required,
                     help_text=help_text,
-                    initial=initial.answer if initial else (default if default else None),
+                    initial=initial.answer if initial else None,
                 )
             elif q.type == Question.TYPE_TEXT:
                 field = forms.CharField(
                     label=label, required=required,
                     help_text=help_text,
                     widget=forms.Textarea,
-                    initial=initial.answer if initial else (default if default else None),
+                    initial=initial.answer if initial else None,
+                )
+            elif q.type == Question.TYPE_COUNTRYCODE:
+                field = CountryField().formfield(
+                    label=label, required=required,
+                    help_text=help_text,
+                    widget=forms.Select,
+                    empty_label='',
+                    initial=initial.answer if initial else None,
                 )
             elif q.type == Question.TYPE_CHOICE:
                 field = forms.ModelChoiceField(
@@ -246,24 +253,21 @@ class BaseQuestionsForm(forms.Form):
                 field = forms.DateField(
                     label=label, required=required,
                     help_text=help_text,
-                    initial=dateutil.parser.parse(initial.answer).date() if initial and initial.answer else (
-                        dateutil.parser.parse(default).date() if default else None),
+                    initial=dateutil.parser.parse(initial.answer).date() if initial and initial.answer else None,
                     widget=DatePickerWidget(),
                 )
             elif q.type == Question.TYPE_TIME:
                 field = forms.TimeField(
                     label=label, required=required,
                     help_text=help_text,
-                    initial=dateutil.parser.parse(initial.answer).time() if initial and initial.answer else (
-                        dateutil.parser.parse(default).time() if default else None),
+                    initial=dateutil.parser.parse(initial.answer).time() if initial and initial.answer else None,
                     widget=TimePickerWidget(time_format=get_format_without_seconds('TIME_INPUT_FORMATS')),
                 )
             elif q.type == Question.TYPE_DATETIME:
                 field = SplitDateTimeField(
                     label=label, required=required,
                     help_text=help_text,
-                    initial=dateutil.parser.parse(initial.answer).astimezone(tz) if initial and initial.answer else (
-                        dateutil.parser.parse(default).astimezone(tz) if default else None),
+                    initial=dateutil.parser.parse(initial.answer).astimezone(tz) if initial and initial.answer else None,
                     widget=SplitDateTimePickerWidget(time_format=get_format_without_seconds('TIME_INPUT_FORMATS')),
                 )
             field.question = q
@@ -348,6 +352,27 @@ class BaseInvoiceAddressForm(forms.ModelForm):
         self.request = kwargs.pop('request', None)
         self.validate_vat_id = kwargs.pop('validate_vat_id')
         self.all_optional = kwargs.pop('all_optional', False)
+
+        kwargs.setdefault('initial', {})
+        if not kwargs.get('instance') or not kwargs['instance'].country:
+            # Try to guess the initial country from either the country of the merchant
+            # or the locale. This will hopefully save at least some users some scrolling :)
+            locale = get_language()
+            country = event.settings.invoice_address_from_country
+            if not country:
+                valid_countries = countries.countries
+                if '-' in locale:
+                    parts = locale.split('-')
+                    if parts[1].upper() in valid_countries:
+                        country = Country(parts[1].upper())
+                    elif parts[0].upper() in valid_countries:
+                        country = Country(parts[0].upper())
+                else:
+                    if locale in valid_countries:
+                        country = Country(locale.upper())
+
+            kwargs['initial']['country'] = country
+
         super().__init__(*args, **kwargs)
         if not event.settings.invoice_address_vatid:
             del self.fields['vat_id']
@@ -399,6 +424,12 @@ class BaseInvoiceAddressForm(forms.ModelForm):
 
         self.instance.name_parts = data.get('name_parts')
 
+        if all(
+                not v for k, v in data.items() if k not in ('is_business', 'country', 'name_parts')
+        ) and len(data.get('name_parts', {})) == 1:
+            # Do not save the country if it is the only field set -- we don't know the user even checked it!
+            self.cleaned_data['country'] = ''
+
         if self.validate_vat_id and self.instance.vat_id_validated and 'vat_id' not in self.changed_data:
             pass
         elif self.validate_vat_id and data.get('is_business') and data.get('country') in EU_COUNTRIES and data.get('vat_id'):

src/pretix/base/invoice.py

@@ -9,14 +9,17 @@ import vat_moss.exchange_rates
 from django.contrib.staticfiles import finders
 from django.dispatch import receiver
 from django.utils.formats import date_format, localize
-from django.utils.translation import get_language, pgettext, ugettext
+from django.utils.translation import (
+    get_language, pgettext, ugettext, ugettext_lazy,
+)
 from PIL.Image import BICUBIC
 from reportlab.lib import pagesizes
-from reportlab.lib.enums import TA_LEFT
+from reportlab.lib.enums import TA_LEFT, TA_RIGHT
 from reportlab.lib.styles import ParagraphStyle, StyleSheet1
 from reportlab.lib.units import mm
 from reportlab.lib.utils import ImageReader
 from reportlab.pdfbase import pdfmetrics
+from reportlab.pdfbase.pdfmetrics import stringWidth
 from reportlab.pdfbase.ttfonts import TTFont
 from reportlab.pdfgen.canvas import Canvas
 from reportlab.platypus import (
@@ -122,6 +125,7 @@ class BaseReportlabInvoiceRenderer(BaseInvoiceRenderer):
         """
         stylesheet = StyleSheet1()
         stylesheet.add(ParagraphStyle(name='Normal', fontName=self.font_regular, fontSize=10, leading=12))
+        stylesheet.add(ParagraphStyle(name='InvoiceFrom', parent=stylesheet['Normal']))
         stylesheet.add(ParagraphStyle(name='Heading1', fontName=self.font_bold, fontSize=15, leading=15 * 1.2))
         stylesheet.add(ParagraphStyle(name='FineprintHeading', fontName=self.font_bold, fontSize=8, leading=12))
         stylesheet.add(ParagraphStyle(name='Fineprint', fontName=self.font_regular, fontSize=8, leading=10))
@@ -254,49 +258,64 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
 
         canvas.restoreState()
 
+    invoice_to_width = 85 * mm
+    invoice_to_height = 50 * mm
+    invoice_to_left = 25 * mm
+    invoice_to_top = 52 * mm
+
     def _draw_invoice_to(self, canvas):
-        p = Paragraph(self.invoice.invoice_to.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
-        p.wrapOn(canvas, 85 * mm, 50 * mm)
-        p_size = p.wrap(85 * mm, 50 * mm)
-        p.drawOn(canvas, 25 * mm, (297 - 52) * mm - p_size[1])
+        p = Paragraph(self.invoice.address_invoice_to.strip().replace('\n', '<br />\n'), 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)
+        p.drawOn(canvas, self.invoice_to_left, self.pagesize[1] - p_size[1] - self.invoice_to_top)
+
+    invoice_from_width = 70 * mm
+    invoice_from_height = 50 * mm
+    invoice_from_left = 25 * mm
+    invoice_from_top = 17 * mm
 
     def _draw_invoice_from(self, canvas):
-        p = Paragraph(self.invoice.full_invoice_from.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
-        p.wrapOn(canvas, 70 * mm, 50 * mm)
-        p_size = p.wrap(70 * mm, 50 * mm)
-        p.drawOn(canvas, 25 * mm, (297 - 17) * mm - p_size[1])
-
-    def _on_first_page(self, canvas: Canvas, doc):
-        canvas.setCreator('pretix.eu')
-        canvas.setTitle(pgettext('invoice', 'Invoice {num}').format(num=self.invoice.number))
-
-        canvas.saveState()
-        canvas.setFont(self.font_regular, 8)
-
-        if self.invoice.order.testmode:
-            canvas.saveState()
-            canvas.setFont('OpenSansBd', 30)
-            canvas.setFillColorRGB(32, 0, 0)
-            canvas.drawRightString(self.pagesize[0] - 20 * mm, (297 - 100) * mm, ugettext('TEST MODE'))
-            canvas.restoreState()
-
-        for i, line in enumerate(self.invoice.footer_text.split('\n')[::-1]):
-            canvas.drawCentredString(self.pagesize[0] / 2, 25 + (3.5 * i) * mm, line.strip())
+        p = Paragraph(self.invoice.full_invoice_from.strip().replace('\n', '<br />\n'), style=self.stylesheet[
+            'InvoiceFrom'])
+        p.wrapOn(canvas, self.invoice_from_width, self.invoice_from_height)
+        p_size = p.wrap(self.invoice_from_width, self.invoice_from_height)
+        p.drawOn(canvas, self.invoice_from_left, self.pagesize[1] - p_size[1] - self.invoice_from_top)
 
+    def _draw_invoice_from_label(self, canvas):
         textobject = canvas.beginText(25 * mm, (297 - 15) * mm)
         textobject.setFont(self.font_bold, 8)
         textobject.textLine(self._upper(pgettext('invoice', 'Invoice from')))
         canvas.drawText(textobject)
 
-        self._draw_invoice_from(canvas)
-
+    def _draw_invoice_to_label(self, canvas):
         textobject = canvas.beginText(25 * mm, (297 - 50) * mm)
         textobject.setFont(self.font_bold, 8)
         textobject.textLine(self._upper(pgettext('invoice', 'Invoice to')))
         canvas.drawText(textobject)
 
-        self._draw_invoice_to(canvas)
+    logo_width = 25 * mm
+    logo_height = 25 * mm
+    logo_left = 95 * mm
+    logo_top = 13 * mm
+    logo_anchor = 'n'
 
+    def _draw_logo(self, canvas):
+        if self.invoice.event.settings.invoice_logo_image:
+            logo_file = self.invoice.event.settings.get('invoice_logo_image', binary_file=True)
+            ir = ThumbnailingImageReader(logo_file)
+            try:
+                ir.resize(self.logo_width, self.logo_height, 300)
+            except:
+                logger.exception("Can not resize image")
+                pass
+            canvas.drawImage(ir,
+                             self.logo_left,
+                             self.pagesize[1] - self.logo_height - self.logo_top,
+                             width=self.logo_width, height=self.logo_height,
+                             preserveAspectRatio=True, anchor=self.logo_anchor,
+                             mask='auto')
+
+    def _draw_metadata(self, canvas):
         textobject = canvas.beginText(125 * mm, (297 - 38) * mm)
         textobject.setFont(self.font_bold, 8)
         textobject.textLine(self._upper(pgettext('invoice', 'Order code')))
@@ -348,37 +367,37 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
 
         canvas.drawText(textobject)
 
-        if self.invoice.event.settings.invoice_logo_image:
-            logo_file = self.invoice.event.settings.get('invoice_logo_image', binary_file=True)
-            ir = ThumbnailingImageReader(logo_file)
-            try:
-                ir.resize(25 * mm, 25 * mm, 300)
-            except:
-                logger.exception("Can not resize image")
-                pass
-            canvas.drawImage(ir,
-                             95 * mm, (297 - 38) * mm,
-                             width=25 * mm, height=25 * mm,
-                             preserveAspectRatio=True, anchor='n',
-                             mask='auto')
+    event_left = 125 * mm
+    event_top = 17 * mm
+    event_width = 65 * mm
+    event_height = 50 * mm
 
+    def _draw_event_label(self, canvas):
+        textobject = canvas.beginText(125 * mm, (297 - 15) * mm)
+        textobject.setFont(self.font_bold, 8)
+        textobject.textLine(self._upper(pgettext('invoice', 'Event')))
+        canvas.drawText(textobject)
+
+    def _draw_event(self, canvas):
         def shorten(txt):
             txt = str(txt)
             p = Paragraph(txt.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
-            p_size = p.wrap(65 * mm, 50 * mm)
+            p_size = p.wrap(self.event_width, self.event_height)
 
             while p_size[1] > 2 * self.stylesheet['Normal'].leading:
                 txt = ' '.join(txt.replace('…', '').split()[:-1]) + '…'
                 p = Paragraph(txt.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
-                p_size = p.wrap(65 * mm, 50 * mm)
+                p_size = p.wrap(self.event_width, self.event_height)
             return txt
 
         if not self.invoice.event.has_subevents:
             if self.invoice.event.settings.show_date_to and self.invoice.event.date_to:
                 p_str = (
-                    shorten(self.invoice.event.name) + '\n' + pgettext('invoice', '{from_date}\nuntil {to_date}').format(
+                    shorten(self.invoice.event.name) + '\n' +
+                    pgettext('invoice', '{from_date}\nuntil {to_date}').format(
                         from_date=self.invoice.event.get_date_from_display(),
-                        to_date=self.invoice.event.get_date_to_display())
+                        to_date=self.invoice.event.get_date_to_display()
+                    )
                 )
             else:
                 p_str = (
@@ -388,15 +407,38 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
             p_str = shorten(self.invoice.event.name)
 
         p = Paragraph(p_str.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
-        p.wrapOn(canvas, 65 * mm, 50 * mm)
-        p_size = p.wrap(65 * mm, 50 * mm)
-        p.drawOn(canvas, 125 * mm, (297 - 17) * mm - p_size[1])
+        p.wrapOn(canvas, self.event_width, self.event_height)
+        p_size = p.wrap(self.event_width, self.event_height)
+        p.drawOn(canvas, self.event_left, self.pagesize[1] - self.event_top - p_size[1])
+        self._draw_event_label(canvas)
 
-        textobject = canvas.beginText(125 * mm, (297 - 15) * mm)
-        textobject.setFont(self.font_bold, 8)
-        textobject.textLine(self._upper(pgettext('invoice', 'Event')))
-        canvas.drawText(textobject)
+    def _draw_footer(self, canvas):
+        canvas.setFont(self.font_regular, 8)
+        for i, line in enumerate(self.invoice.footer_text.split('\n')[::-1]):
+            canvas.drawCentredString(self.pagesize[0] / 2, 25 + (3.5 * i) * mm, line.strip())
 
+    def _draw_testmode(self, canvas):
+        if self.invoice.order.testmode:
+            canvas.saveState()
+            canvas.setFont('OpenSansBd', 30)
+            canvas.setFillColorRGB(32, 0, 0)
+            canvas.drawRightString(self.pagesize[0] - 20 * mm, (297 - 100) * mm, ugettext('TEST MODE'))
+            canvas.restoreState()
+
+    def _on_first_page(self, canvas: Canvas, doc):
+        canvas.setCreator('pretix.eu')
+        canvas.setTitle(pgettext('invoice', 'Invoice {num}').format(num=self.invoice.number))
+
+        canvas.saveState()
+        self._draw_footer(canvas)
+        self._draw_testmode(canvas)
+        self._draw_invoice_from_label(canvas)
+        self._draw_invoice_from(canvas)
+        self._draw_invoice_to_label(canvas)
+        self._draw_invoice_to(canvas)
+        self._draw_metadata(canvas)
+        self._draw_logo(canvas)
+        self._draw_event(canvas)
         canvas.restoreState()
 
     def _get_first_page_frames(self, doc):
@@ -434,6 +476,13 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
                 self.stylesheet['Normal']
             ))
 
+        if self.invoice.invoice_to_vat_id:
+            story.append(Paragraph(
+                pgettext('invoice', 'Customer VAT ID') + ':<br />' +
+                bleach.clean(self.invoice.invoice_to_vat_id, tags=[]).replace("\n", "<br />\n"),
+                self.stylesheet['Normal']
+            ))
+
         if self.invoice.invoice_to_beneficiary:
             story.append(Paragraph(
                 pgettext('invoice', 'Beneficiary') + ':<br />' +
@@ -554,6 +603,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
             colwidths = [a * doc.width for a in (.25, .15, .15, .15, .3)]
             table = Table(tdata, colWidths=colwidths, repeatRows=2, hAlign=TA_LEFT)
             table.setStyle(TableStyle(tstyledata))
+            story.append(Spacer(5 * mm, 5 * mm))
             story.append(KeepTogether([
                 Paragraph(pgettext('invoice', 'Included taxes'), self.stylesheet['FineprintHeading']),
                 table
@@ -607,6 +657,114 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
         return story
 
 
+class Modern1Renderer(ClassicInvoiceRenderer):
+    identifier = 'modern1'
+    verbose_name = ugettext_lazy('Modern Invoice Renderer (pretix 2.7)')
+    bottom_margin = 16.9 * mm
+    top_margin = 16.9 * mm
+    right_margin = 20 * mm
+    invoice_to_height = 27.3 * mm
+    invoice_to_width = 80 * mm
+    invoice_to_left = 25 * mm
+    invoice_to_top = (40 + 17.7) * mm
+    invoice_from_left = 125 * mm
+    invoice_from_top = 50 * mm
+    invoice_from_width = pagesizes.A4[0] - invoice_from_left - right_margin
+    invoice_from_height = 50 * mm
+
+    logo_width = 75 * mm
+    logo_height = 25 * mm
+    logo_left = pagesizes.A4[0] - logo_width - right_margin
+    logo_top = top_margin
+    logo_anchor = 'e'
+
+    event_left = 25 * mm
+    event_top = top_margin
+    event_width = 80 * mm
+    event_height = 25 * mm
+
+    def _get_stylesheet(self):
+        stylesheet = super()._get_stylesheet()
+        stylesheet.add(ParagraphStyle(name='Sender', fontName=self.font_regular, fontSize=8, leading=10))
+        stylesheet['InvoiceFrom'].alignment = TA_RIGHT
+        return stylesheet
+
+    def _draw_invoice_from(self, canvas):
+        if not self.invoice.invoice_from:
+            return
+        c = self.invoice.address_invoice_from.strip().split('\n')
+        p = Paragraph(' · '.join(c), style=self.stylesheet['Sender'])
+        p.wrapOn(canvas, self.invoice_to_width, 15.7 * mm)
+        p.drawOn(canvas, self.invoice_to_left, self.pagesize[1] - self.invoice_to_top + 2 * mm)
+        super()._draw_invoice_from(canvas)
+
+    def _draw_invoice_to_label(self, canvas):
+        pass
+
+    def _draw_invoice_from_label(self, canvas):
+        pass
+
+    def _draw_event_label(self, canvas):
+        pass
+
+    def _get_first_page_frames(self, doc):
+        footer_length = 3.5 * len(self.invoice.footer_text.split('\n')) * mm
+        return [
+            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height - 95 * mm,
+                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=footer_length,
+                  id='normal')
+        ]
+
+    def _draw_metadata(self, canvas):
+        begin_top = 100 * mm
+
+        textobject = canvas.beginText(self.left_margin, self.pagesize[1] - begin_top)
+        textobject.setFont(self.font_regular, 8)
+        textobject.textLine(pgettext('invoice', 'Order code'))
+        textobject.moveCursor(0, 5)
+        textobject.setFont(self.font_regular, 10)
+        textobject.textLine(self.invoice.order.full_code)
+        canvas.drawText(textobject)
+
+        if self.invoice.is_cancellation:
+            textobject = canvas.beginText(self.left_margin + 50 * mm, self.pagesize[1] - begin_top)
+            textobject.setFont(self.font_regular, 8)
+            textobject.textLine(pgettext('invoice', 'Cancellation number'))
+            textobject.moveCursor(0, 5)
+            textobject.setFont(self.font_regular, 10)
+            textobject.textLine(self.invoice.number)
+            canvas.drawText(textobject)
+
+            textobject = canvas.beginText(self.left_margin + 100 * mm, self.pagesize[1] - begin_top)
+            textobject.setFont(self.font_regular, 8)
+            textobject.textLine(pgettext('invoice', 'Original invoice'))
+            textobject.moveCursor(0, 5)
+            textobject.setFont(self.font_regular, 10)
+            textobject.textLine(self.invoice.refers.number)
+            canvas.drawText(textobject)
+        else:
+            textobject = canvas.beginText(self.left_margin + 70 * mm, self.pagesize[1] - begin_top)
+            textobject.textLine(pgettext('invoice', 'Invoice number'))
+            textobject.moveCursor(0, 5)
+            textobject.setFont(self.font_regular, 10)
+            textobject.textLine(self.invoice.number)
+            canvas.drawText(textobject)
+
+        p = Paragraph(date_format(self.invoice.date, "DATE_FORMAT"), style=self.stylesheet['Normal'])
+        w = stringWidth(p.text, p.frags[0].fontName, p.frags[0].fontSize)
+        p.wrapOn(canvas, w, 15 * mm)
+        date_x = self.pagesize[0] - w - self.right_margin
+        p.drawOn(canvas, date_x, self.pagesize[1] - begin_top - 10 - 6)
+
+        textobject = canvas.beginText(date_x, self.pagesize[1] - begin_top)
+        textobject.setFont(self.font_regular, 8)
+        if self.invoice.is_cancellation:
+            textobject.textLine(pgettext('invoice', 'Cancellation date'))
+        else:
+            textobject.textLine(pgettext('invoice', 'Invoice date'))
+        canvas.drawText(textobject)
+
+
 @receiver(register_invoice_renderers, dispatch_uid="invoice_renderer_classic")
 def recv_classic(sender, **kwargs):
-    return ClassicInvoiceRenderer
+    return [ClassicInvoiceRenderer, Modern1Renderer]

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

@@ -0,0 +1,51 @@
+"""
+Django, for theoretically very valid reasons, creates migrations for *every single thing*
+we change on a model. Even the `help_text`! This makes sense, as we don't know if any
+database backend unknown to us might actually use this information for its database schema.
+
+However, pretix only supports PostgreSQL, MySQL, MariaDB and SQLite and we can be pretty
+certain that some changes to models will never require a change to the database. In this case,
+not creating a migration for certain changes will save us some performance while applying them
+*and* allow for a cleaner git history. Win-win!
+
+Only caveat is that we need to do some dirty monkeypatching to achieve it...
+"""
+from django.core.management.commands.makemigrations import Command as Parent
+from django.db import models
+from django.db.migrations.operations import models as modelops
+from django_countries.fields import CountryField
+
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("verbose_name")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("verbose_name_plural")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("ordering")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("get_latest_by")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("default_manager_name")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("permissions")
+modelops.AlterModelOptions.ALTER_OPTION_KEYS.remove("default_permissions")
+IGNORED_ATTRS = [
+    # (field type, attribute name, blacklist of field sub-types)
+    (models.Field, 'verbose_name', []),
+    (models.Field, 'help_text', []),
+    (models.Field, 'validators', []),
+    (models.Field, 'editable', [models.DateField, models.DateTimeField, models.DateField, models.BinaryField]),
+    (models.Field, 'blank', [models.DateField, models.DateTimeField, models.AutoField, models.NullBooleanField,
+                             models.TimeField]),
+    (models.CharField, 'choices', [CountryField])
+]
+
+original_deconstruct = models.Field.deconstruct
+
+
+def new_deconstruct(self):
+    name, path, args, kwargs = original_deconstruct(self)
+    for ftype, attr, blacklist in IGNORED_ATTRS:
+        if isinstance(self, ftype) and not any(isinstance(self, ft) for ft in blacklist):
+            kwargs.pop(attr, None)
+    return name, path, args, kwargs
+
+
+models.Field.deconstruct = new_deconstruct
+
+
+class Command(Parent):
+    pass

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

@@ -0,0 +1,28 @@
+"""
+Django tries to be helpful by suggesting to run "makemigrations" in red font on every "migrate"
+run when there are things we have no migrations for. Usually, this is intended, and running
+"makemigrations" can really screw up the environment of a user, so we want to prevent novice
+users from doing that by going really dirty and fitlering it from the output.
+"""
+import sys
+
+from django.core.management.base import OutputWrapper
+from django.core.management.commands.migrate import Command as Parent
+
+
+class OutputFilter(OutputWrapper):
+    blacklist = (
+        "Your models have changes that are not yet reflected",
+        "Run 'manage.py makemigrations' to make new "
+    )
+
+    def write(self, msg, style_func=None, ending=None):
+        if any(b in msg for b in self.blacklist):
+            return
+        super().write(msg, style_func, ending)
+
+
+class Command(Parent):
+    def __init__(self, stdout=None, stderr=None, no_color=False, force_color=False):
+        super().__init__(stdout, stderr, no_color, force_color)
+        self.stdout = OutputFilter(stdout or sys.stdout)

src/pretix/base/middleware.py

@@ -97,7 +97,7 @@ def get_language_from_event(request: HttpRequest) -> str:
 
 
 def get_language_from_browser(request: HttpRequest) -> str:
-    accept = request.META.get('HTTP_ACCEPT_LANGUAGE', '')
+    accept = request.headers.get('Accept-Language', '')
     for accept_lang, unused in parse_accept_lang_header(accept):
         if accept_lang == '*':
             break

src/pretix/base/migrations/0116_auto_20180531_1739.py

@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-05-31 15:39
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('pretixbase', '0115_auto_20190323_2238'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='question',
-            name='default_value',
-            field=models.TextField(blank=True, help_text='The question will be filled with this response by default', null=True, verbose_name='Default answer'),
-        ),
-    ]

src/pretix/base/migrations/0116_auto_20190402_0722.py

@@ -0,0 +1,22 @@
+# Generated by Django 2.1.5 on 2019-04-02 07:22
+
+import django.db.models.deletion
+import jsonfallback.fields
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0115_auto_20190323_2238'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='device',
+            name='revoked',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/migrations/0117_auto_20190418_1149.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.2 on 2019-04-18 11:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0116_auto_20190402_0722'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='itemvariation',
+            name='original_price',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='If set, this will be displayed next to '
+                                                                              'the current price to show that the '
+                                                                              'current price is a discounted one. '
+                                                                              'This is just a cosmetic setting and '
+                                                                              'will not actually impact pricing.',
+                                      max_digits=7, null=True, verbose_name='Original price'),
+        ),
+    ]

src/pretix/base/migrations/0118_auto_20190423_0839.py

@@ -0,0 +1,22 @@
+# Generated by Django 2.2 on 2019-04-23 08:39
+
+import django.db.models.deletion
+import jsonfallback.fields
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0117_auto_20190418_1149'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='subevent',
+            name='is_public',
+            field=models.BooleanField(default=True, help_text='If selected, this event will show up publicly on the list of dates for your event.', verbose_name='Show in lists'),
+        ),
+    ]

src/pretix/base/migrations/0119_auto_20190509_0654.py

@@ -0,0 +1,22 @@
+# Generated by Django 2.2 on 2019-05-09 06:54
+
+import django.db.models.deletion
+import jsonfallback.fields
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0118_auto_20190423_0839'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='hidden',
+            field=models.BooleanField(default=False, help_text='This question will only show up in the backend.', verbose_name='Hidden question'),
+        ),
+    ]

src/pretix/base/migrations/0120_auto_20190509_0736.py

@@ -0,0 +1,77 @@
+# Generated by Django 2.2 on 2019-05-09 07:36
+
+import django.db.models.deletion
+import jsonfallback.fields
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0119_auto_20190509_0654'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cartposition',
+            name='attendee_name_parts',
+            field=jsonfallback.fields.FallbackJSONField(default=dict),
+        ),
+        migrations.AlterField(
+            model_name='cartposition',
+            name='subevent',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.SubEvent'),
+        ),
+        migrations.AlterField(
+            model_name='cartposition',
+            name='voucher',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.Voucher'),
+        ),
+        migrations.AlterField(
+            model_name='event',
+            name='is_public',
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AlterField(
+            model_name='invoiceaddress',
+            name='name_parts',
+            field=jsonfallback.fields.FallbackJSONField(default=dict),
+        ),
+        migrations.AlterField(
+            model_name='item',
+            name='sales_channels',
+            field=pretix.base.models.fields.MultiStringField(default=['web']),
+        ),
+        migrations.AlterField(
+            model_name='order',
+            name='sales_channel',
+            field=models.CharField(default='web', max_length=190),
+        ),
+        migrations.AlterField(
+            model_name='orderposition',
+            name='attendee_name_parts',
+            field=jsonfallback.fields.FallbackJSONField(default=dict),
+        ),
+        migrations.AlterField(
+            model_name='orderposition',
+            name='subevent',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.SubEvent'),
+        ),
+        migrations.AlterField(
+            model_name='orderposition',
+            name='voucher',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.Voucher'),
+        ),
+        migrations.AlterField(
+            model_name='staffsessionauditlog',
+            name='method',
+            field=models.CharField(max_length=255),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='email',
+            field=models.EmailField(db_index=True, max_length=190, null=True, unique=True),
+        ),
+    ]

src/pretix/base/migrations/0121_order_email_known_to_work.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.1 on 2019-05-15 05:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0120_auto_20190509_0736'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='email_known_to_work',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/migrations/0122_orderposition_web_secret.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.2.1 on 2019-05-15 13:23
+
+from django.db import migrations, models
+
+import pretix.base.models.orders
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0121_order_email_known_to_work'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='orderposition',
+            name='web_secret',
+            field=models.CharField(db_index=True, default=pretix.base.models.orders.generate_secret, max_length=32),
+        ),
+    ]

src/pretix/base/models/auth.py

@@ -111,6 +111,7 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
     class Meta:
         verbose_name = _("User")
         verbose_name_plural = _("Users")
+        ordering = ('email',)
 
     def save(self, *args, **kwargs):
         self.email = self.email.lower()

src/pretix/base/models/base.py

@@ -6,7 +6,9 @@ from django.db import models
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.signals import post_delete
 from django.dispatch import receiver
+from django.urls import reverse
 from django.utils.crypto import get_random_string
+from django.utils.functional import cached_property
 
 from pretix.helpers.json import CustomJSONEncoder
 
@@ -113,6 +115,40 @@ class LoggedModel(models.Model, LoggingMixin):
     class Meta:
         abstract = True
 
+    @cached_property
+    def logs_content_type(self):
+        return ContentType.objects.get_for_model(type(self))
+
+    @cached_property
+    def all_logentries_link(self):
+        from pretix.base.models import Event
+
+        if isinstance(self, Event):
+            event = self
+        elif hasattr(self, 'event'):
+            event = self.event
+        else:
+            return None
+        return reverse(
+            'control:event.log',
+            kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug,
+            }
+        ) + '?content_type={}&object={}'.format(
+            self.logs_content_type.pk,
+            self.pk
+        )
+
+    def top_logentries(self):
+        qs = self.all_logentries()
+        if self.all_logentries_link:
+            qs = qs[:25]
+        return qs
+
+    def top_logentries_has_more(self):
+        return self.all_logentries().count() > 25
+
     def all_logentries(self):
         """
         Returns all log entries that are attached to this object.
@@ -122,7 +158,7 @@ class LoggedModel(models.Model, LoggingMixin):
         from .log import LogEntry
 
         return LogEntry.objects.filter(
-            content_type=ContentType.objects.get_for_model(type(self)), object_id=self.pk
+            content_type=self.logs_content_type, object_id=self.pk
         ).select_related('user', 'event', 'oauth_application', 'api_token', 'device')
 
 

src/pretix/base/models/devices.py

@@ -41,6 +41,7 @@ class Device(LoggedModel):
     api_token = models.CharField(max_length=190, unique=True, null=True)
     all_events = models.BooleanField(default=False, verbose_name=_("All events (including newly created ones)"))
     limit_events = models.ManyToManyField('Event', verbose_name=_("Limit to events"), blank=True)
+    revoked = models.BooleanField(default=False)
     name = models.CharField(
         max_length=190,
         verbose_name=_('Name')

src/pretix/base/models/event.py

@@ -164,7 +164,7 @@ class EventMixin:
     def annotated(cls, qs, channel='web'):
         from pretix.base.models import Item, ItemVariation, Quota
 
-        sq_active_item = Item.objects.filter_available(channel=channel).filter(
+        sq_active_item = Item.objects.using(settings.DATABASE_REPLICA).filter_available(channel=channel).filter(
             Q(variations__isnull=True)
             & Q(quotas__pk=OuterRef('pk'))
         ).order_by().values_list('quotas__pk').annotate(
@@ -186,7 +186,7 @@ class EventMixin:
             Prefetch(
                 'quotas',
                 to_attr='active_quotas',
-                queryset=Quota.objects.annotate(
+                queryset=Quota.objects.using(settings.DATABASE_REPLICA).annotate(
                     active_items=Subquery(sq_active_item, output_field=models.TextField()),
                     active_variations=Subquery(sq_active_variation, output_field=models.TextField()),
                 ).exclude(
@@ -445,6 +445,7 @@ class Event(EventMixin, LoggedModel):
 
         self.plugins = other.plugins
         self.is_public = other.is_public
+        self.testmode = other.testmode
         self.save()
 
         tax_map = {}
@@ -639,22 +640,6 @@ class Event(EventMixin, LoggedModel):
         irs = self.get_invoice_renderers()
         return irs[self.settings.invoice_renderer]
 
-    @property
-    def active_subevents(self):
-        """
-        Returns a queryset of active subevents.
-        """
-        return self.subevents.filter(active=True).order_by('-date_from', 'name')
-
-    @property
-    def active_future_subevents(self):
-        return self.subevents.filter(
-            Q(active=True) & (
-                Q(Q(date_to__isnull=True) & Q(date_from__gte=now()))
-                | Q(date_to__gte=now())
-            )
-        ).order_by('date_from', 'name')
-
     def subevents_annotated(self, channel):
         return SubEvent.annotated(self.subevents, channel)
 
@@ -667,7 +652,7 @@ class Event(EventMixin, LoggedModel):
             'name_descending': ('-name', 'date_from'),
         }[ordering]
         subevs = queryset.filter(
-            Q(active=True) & (
+            Q(active=True) & Q(is_public=True) & (
                 Q(Q(date_to__isnull=True) & Q(date_from__gte=now() - timedelta(hours=24)))
                 | Q(date_to__gte=now() - timedelta(hours=24))
             )
@@ -759,6 +744,7 @@ class Event(EventMixin, LoggedModel):
         return not self.orders.exists() and not self.invoices.exists()
 
     def delete_sub_objects(self):
+        self.cartposition_set.filter(addon_to__isnull=False).delete()
         self.cartposition_set.all().delete()
         self.items.all().delete()
         self.subevents.all().delete()
@@ -832,6 +818,8 @@ class SubEvent(EventMixin, LoggedModel):
     :type event: Event
     :param active: Whether to show the subevent
     :type active: bool
+    :param is_public: Whether to show the subevent in lists
+    :type is_public: bool
     :param name: This event's full title
     :type name: str
     :param date_from: The datetime this event starts
@@ -850,6 +838,10 @@ class SubEvent(EventMixin, LoggedModel):
     active = models.BooleanField(default=False, verbose_name=_("Active"),
                                  help_text=_("Only with this checkbox enabled, this date is visible in the "
                                              "frontend to users."))
+    is_public = models.BooleanField(default=True,
+                                    verbose_name=_("Show in lists"),
+                                    help_text=_("If selected, this event will show up publicly on the list of dates "
+                                                "for your event."))
     name = I18nCharField(
         max_length=200,
         verbose_name=_("Name"),

src/pretix/base/models/fields.py

@@ -37,7 +37,7 @@ class MultiStringField(TextField):
     def get_prep_lookup(self, lookup_type, value):  # NOQA
         raise TypeError('Lookups on multi strings are currently not supported.')
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection):
         if value:
             return [v for v in value.split(DELIMITER) if v]
         else:

src/pretix/base/models/invoices.py

@@ -117,12 +117,35 @@ class Invoice(models.Model):
             self.invoice_from_name,
             self.invoice_from,
             (self.invoice_from_zipcode or "") + " " + (self.invoice_from_city or ""),
-            str(self.invoice_from_country),
+            self.invoice_from_country.name if self.invoice_from_country else "",
             pgettext("invoice", "VAT-ID: %s") % self.invoice_from_vat_id if self.invoice_from_vat_id else "",
             pgettext("invoice", "Tax ID: %s") % self.invoice_from_tax_id if self.invoice_from_tax_id else "",
         ]
         return '\n'.join([p.strip() for p in parts if p and p.strip()])
 
+    @property
+    def address_invoice_from(self):
+        parts = [
+            self.invoice_from_name,
+            self.invoice_from,
+            (self.invoice_from_zipcode or "") + " " + (self.invoice_from_city or ""),
+            self.invoice_from_country.name if self.invoice_from_country else "",
+        ]
+        return '\n'.join([p.strip() for p in parts if p and p.strip()])
+
+    @property
+    def address_invoice_to(self):
+        if self.invoice_to and not self.invoice_to_company and not self.invoice_to_name:
+            return self.invoice_to
+        parts = [
+            self.invoice_to_company,
+            self.invoice_to_name,
+            self.invoice_to_street,
+            (self.invoice_to_zipcode or "") + " " + (self.invoice_to_city or ""),
+            self.invoice_to_country.name if self.invoice_to_country else "",
+        ]
+        return '\n'.join([p.strip() for p in parts if p and p.strip()])
+
     def _get_numeric_invoice_number(self):
         numeric_invoices = Invoice.objects.filter(
             event__organizer=self.event.organizer,

src/pretix/base/models/items.py

@@ -16,6 +16,7 @@ from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
 from django.utils.timezone import is_naive, make_aware, now
 from django.utils.translation import pgettext_lazy, ugettext_lazy as _
+from django_countries.fields import Country
 from i18nfield.fields import I18nCharField, I18nTextField
 
 from pretix.base.models import fields
@@ -332,7 +333,9 @@ class Item(LoggedModel):
     require_bundling = models.BooleanField(
         verbose_name=_('Only sell this product as part of a bundle'),
         default=False,
-        help_text=_('If this option is set, the product will only be sold as part of bundle products.')
+        help_text=_('If this option is set, the product will only be sold as part of bundle products. Do '
+                    '<strong>not</strong> check this option if you want to use this product as an add-on product, '
+                    'but only for fixed bundles!')
     )
     allow_cancel = models.BooleanField(
         verbose_name=_('Allow product to be canceled'),
@@ -550,6 +553,8 @@ class ItemVariation(models.Model):
     :type active: bool
     :param default_price: This variation's default price
     :type default_price: decimal.Decimal
+    :param original_price: The item's "original" price. Will not be used for any calculations, will just be shown.
+    :type original_price: decimal.Decimal
     """
     item = models.ForeignKey(
         Item,
@@ -578,6 +583,13 @@ class ItemVariation(models.Model):
         null=True, blank=True,
         verbose_name=_("Default price"),
     )
+    original_price = models.DecimalField(
+        verbose_name=_('Original price'),
+        blank=True, null=True,
+        max_digits=7, decimal_places=2,
+        help_text=_('If set, this will be displayed next to the current price to show that the current price is a '
+                    'discounted one. This is just a cosmetic setting and will not actually impact pricing.')
+    )
 
     class Meta:
         verbose_name = _("Product variation")
@@ -884,6 +896,8 @@ class Question(LoggedModel):
     :param items: A set of ``Items`` objects that this question should be applied to
     :param ask_during_checkin: Whether to ask this question during check-in instead of during check-out.
     :type ask_during_checkin: bool
+    :param hidden: Whether to only show the question in the backend
+    :type hidden: bool
     :param identifier: An arbitrary, internal identifier
     :type identifier: str
     :param dependency_question: This question will only show up if the referenced question is set to `dependency_value`.
@@ -901,6 +915,7 @@ class Question(LoggedModel):
     TYPE_DATE = "D"
     TYPE_TIME = "H"
     TYPE_DATETIME = "W"
+    TYPE_COUNTRYCODE = "CC"
     TYPE_CHOICES = (
         (TYPE_NUMBER, _("Number")),
         (TYPE_STRING, _("Text (one line)")),
@@ -912,6 +927,7 @@ class Question(LoggedModel):
         (TYPE_DATE, _("Date")),
         (TYPE_TIME, _("Time")),
         (TYPE_DATETIME, _("Date and time")),
+        (TYPE_COUNTRYCODE, _("Country code (ISO 3166-1 alpha-2)")),
     )
 
     event = models.ForeignKey(
@@ -959,15 +975,15 @@ class Question(LoggedModel):
                     'pretixdesk 0.2 or newer.'),
         default=False
     )
+    hidden = models.BooleanField(
+        verbose_name=_('Hidden question'),
+        help_text=_('This question will only show up in the backend.'),
+        default=False
+    )
     dependency_question = models.ForeignKey(
         'Question', null=True, blank=True, on_delete=models.SET_NULL, related_name='dependent_questions'
     )
     dependency_value = models.TextField(null=True, blank=True)
-    default_value = models.TextField(
-        verbose_name=_('Default answer'),
-        help_text=_('The question will be filled with this response by default'),
-        null=True, blank=True,
-    )
 
     class Meta:
         verbose_name = _("Question")
@@ -985,10 +1001,6 @@ class Question(LoggedModel):
     def clean_identifier(self, code):
         Question._clean_identifier(self.event, code, self)
 
-    def clean(self):
-        if self.default_value is not None:
-            self.clean_answer(self.default_value, check_required=False)
-
     @staticmethod
     def _clean_identifier(event, code, instance=None):
         qs = Question.objects.filter(event=event, identifier__iexact=code)
@@ -1016,8 +1028,8 @@ class Question(LoggedModel):
     def __lt__(self, other) -> bool:
         return self.sortkey < other.sortkey
 
-    def clean_answer(self, answer, check_required=True):
-        if self.required and check_required:
+    def clean_answer(self, answer):
+        if self.required:
             if not answer or (self.type == Question.TYPE_BOOLEAN and answer not in ("true", "True", True)):
                 raise ValidationError(_('An answer to this question is required to proceed.'))
         if not answer:
@@ -1071,6 +1083,12 @@ class Question(LoggedModel):
                 return dt
             except:
                 raise ValidationError(_('Invalid datetime input.'))
+        elif self.type == Question.TYPE_COUNTRYCODE and answer:
+            c = Country(answer.upper())
+            if c.name:
+                return answer
+            else:
+                raise ValidationError(_('Unknown country code.'))
 
         return answer
 
@@ -1290,7 +1308,8 @@ class Quota(LoggedModel):
                     'cached_availability_state', 'cached_availability_number', 'cached_availability_time',
                     'cached_availability_paid_orders'
                 ],
-                clear_cache=False
+                clear_cache=False,
+                using='default'
             )
 
         if _cache is not None:
@@ -1400,7 +1419,7 @@ class Quota(LoggedModel):
 
     @staticmethod
     def clean_variations(items, variations):
-        for variation in variations:
+        for variation in (variations or []):
             if variation.item not in items:
                 raise ValidationError(_('All variations must belong to an item contained in the items list.'))
                 break

src/pretix/base/models/orders.py

@@ -1,4 +1,5 @@
 import copy
+import hashlib
 import json
 import logging
 import os
@@ -24,7 +25,7 @@ from django.utils.formats import date_format
 from django.utils.functional import cached_property
 from django.utils.timezone import make_aware, now
 from django.utils.translation import pgettext_lazy, ugettext_lazy as _
-from django_countries.fields import CountryField
+from django_countries.fields import Country, CountryField
 from i18nfield.strings import LazyI18nString
 from jsonfallback.fields import FallbackJSONField
 
@@ -32,6 +33,7 @@ from pretix.base.decimal import round_decimal
 from pretix.base.i18n import language
 from pretix.base.models import User
 from pretix.base.reldate import RelativeDateWrapper
+from pretix.base.services.locking import NoLockManager
 from pretix.base.settings import PERSON_NAME_SCHEMES
 
 from .base import LockModel, LoggedModel
@@ -179,6 +181,10 @@ class Order(LockModel, LoggedModel):
         default=False
     )
     sales_channel = models.CharField(max_length=190, default="web")
+    email_known_to_work = models.BooleanField(
+        default=False,
+        verbose_name=_('E-mail address verified')
+    )
 
     class Meta:
         verbose_name = _("Order")
@@ -205,6 +211,9 @@ class Order(LockModel, LoggedModel):
         self.event.cache.delete('complain_testmode_orders')
         self.delete()
 
+    def email_confirm_hash(self):
+        return hashlib.sha256(settings.SECRET_KEY.encode() + self.secret.encode()).hexdigest()[:9]
+
     @property
     def fees(self):
         """
@@ -606,7 +615,7 @@ class Order(LockModel, LoggedModel):
             ), tz)
         return term_last
 
-    def _can_be_paid(self, count_waitinglist=True) -> Union[bool, str]:
+    def _can_be_paid(self, count_waitinglist=True, ignore_date=False) -> Union[bool, str]:
         error_messages = {
             'late_lastdate': _("The payment can not be accepted as the last date of payments configured in the "
                                "payment settings is over."),
@@ -617,13 +626,13 @@ class Order(LockModel, LoggedModel):
         if self.require_approval:
             return error_messages['require_approval']
         term_last = self.payment_term_last
-        if term_last:
+        if term_last and not ignore_date:
             if now() > term_last:
                 return error_messages['late_lastdate']
 
         if self.status == self.STATUS_PENDING:
             return True
-        if not self.event.settings.get('payment_term_accept_late'):
+        if not self.event.settings.get('payment_term_accept_late') and not ignore_date:
             return error_messages['late']
 
         return self._is_still_available(count_waitinglist=count_waitinglist)
@@ -664,7 +673,7 @@ class Order(LockModel, LoggedModel):
     def send_mail(self, subject: str, template: Union[str, LazyI18nString],
                   context: Dict[str, Any]=None, log_entry_type: str='pretix.event.order.email.sent',
                   user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
-                  auth=None, attach_tickets=False):
+                  auth=None, attach_tickets=False, position: 'OrderPosition'=None):
         """
         Sends an email to the user that placed this order. Basically, this method does two things:
 
@@ -681,6 +690,9 @@ class Order(LockModel, LoggedModel):
         :param headers: Dictionary with additional mail headers
         :param sender: Custom email sender.
         :param attach_tickets: Attach tickets of this order, if they are existing and ready to download
+        :param position: An order position this refers to. If given, no invoices will be attached, the tickets will
+                         only be attached for this position and child positions, the link will only point to the
+                         position and the attendee email will be used if available.
         """
         from pretix.base.services.mail import SendMailException, mail, render_mail
 
@@ -692,12 +704,16 @@ class Order(LockModel, LoggedModel):
 
         with language(self.locale):
             recipient = self.email
+            if position and position.attendee_email:
+                recipient = position.attendee_email
+
             try:
                 email_content = render_mail(template, context)
                 mail(
                     recipient, subject, template, context,
-                    self.event, self.locale, self, headers, sender,
-                    invoices=invoices, attach_tickets=attach_tickets
+                    self.event, self.locale, self, headers=headers, sender=sender,
+                    invoices=invoices, attach_tickets=attach_tickets,
+                    position=position
                 )
             except SendMailException:
                 raise
@@ -709,6 +725,7 @@ class Order(LockModel, LoggedModel):
                     data={
                         'subject': subject,
                         'message': email_content,
+                        'position': position.positionid if position else None,
                         'recipient': recipient,
                         'invoices': [i.pk for i in invoices] if invoices else [],
                         'attach_tickets': attach_tickets,
@@ -728,9 +745,10 @@ class Order(LockModel, LoggedModel):
             email_template = self.event.settings.mail_text_resend_link
             email_context = {
                 'event': self.event.name,
-                'url': build_absolute_uri(self.event, 'presale:event.order', kwargs={
+                'url': build_absolute_uri(self.event, 'presale:event.order.open', kwargs={
                     'order': self.code,
-                    'secret': self.secret
+                    'secret': self.secret,
+                    'hash': self.email_confirm_hash()
                 }),
                 'invoice_name': invoice_name,
                 'invoice_company': invoice_company,
@@ -859,6 +877,8 @@ class QuestionAnswer(models.Model):
                 return date_format(d, "TIME_FORMAT")
             except ValueError:
                 return self.answer
+        elif self.question.type == Question.TYPE_COUNTRYCODE and self.answer:
+            return Country(self.answer).name or self.answer
         else:
             return self.answer
 
@@ -958,6 +978,10 @@ class AbstractPosition(models.Model):
         else:
             return {}
 
+    @meta_info_data.setter
+    def meta_info_data(self, d):
+        self.meta_info = json.dumps(d)
+
     def cache_answers(self, all=True):
         """
         Creates two properties on the object.
@@ -975,7 +999,8 @@ class AbstractPosition(models.Model):
             if hasattr(self.item, 'questions_to_ask'):
                 questions = list(copy.copy(q) for q in self.item.questions_to_ask)
             else:
-                questions = list(copy.copy(q) for q in self.item.questions.filter(ask_during_checkin=False))
+                questions = list(copy.copy(q) for q in self.item.questions.filter(ask_during_checkin=False,
+                                                                                  hidden=False))
         else:
             questions = list(copy.copy(q) for q in self.item.questions.all())
 
@@ -1137,9 +1162,9 @@ class OrderPayment(models.Model):
         """
         return self.order.event.get_payment_providers().get(self.provider)
 
-    def _mark_paid(self, force, count_waitinglist, user, auth, overpaid=False):
+    def _mark_paid(self, force, count_waitinglist, user, auth, ignore_date=False, overpaid=False):
         from pretix.base.signals import order_paid
-        can_be_paid = self.order._can_be_paid(count_waitinglist=count_waitinglist)
+        can_be_paid = self.order._can_be_paid(count_waitinglist=count_waitinglist, ignore_date=ignore_date)
         if not force and can_be_paid is not True:
             self.order.log_action('pretix.event.order.quotaexceeded', {
                 'message': can_be_paid
@@ -1159,7 +1184,8 @@ class OrderPayment(models.Model):
             self.order.log_action('pretix.event.order.overpaid', {}, user=user, auth=auth)
         order_paid.send(self.order.event, order=self.order)
 
-    def confirm(self, count_waitinglist=True, send_mail=True, force=False, user=None, auth=None, mail_text=''):
+    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):
         """
         Marks the payment as complete. If possible, this also marks the order as paid if no further
         payment is required
@@ -1169,6 +1195,7 @@ class OrderPayment(models.Model):
         :type count_waitinglist: boolean
         :param force: Whether this payment should be marked as paid even if no remaining
                       quota is available (default: ``False``).
+        :param ignore_date: Whether this order should be marked as paid even when the last date of payments is over.
         :type force: boolean
         :param send_mail: Whether an email should be sent to the user about this event (default: ``True``).
         :type send_mail: boolean
@@ -1179,8 +1206,6 @@ class OrderPayment(models.Model):
         :raises Quota.QuotaExceededException: if the quota is exceeded and ``force`` is ``False``
         """
         from pretix.base.services.invoices import generate_invoice, invoice_qualified
-        from pretix.base.services.mail import SendMailException
-        from pretix.multidomain.urlreverse import build_absolute_uri
 
         with transaction.atomic():
             locked_instance = OrderPayment.objects.select_for_update().get(pk=self.pk)
@@ -1189,7 +1214,7 @@ class OrderPayment(models.Model):
                 return
 
             locked_instance.state = self.PAYMENT_STATE_CONFIRMED
-            locked_instance.payment_date = now()
+            locked_instance.payment_date = payment_date or now()
             locked_instance.info = self.info  # required for backwards compatibility
             locked_instance.save(update_fields=['state', 'payment_date', 'info'])
 
@@ -1218,14 +1243,16 @@ class OrderPayment(models.Model):
         if payment_sum - refund_sum < self.order.total:
             return
 
-        if self.order.status == Order.STATUS_PENDING and self.order.expires > now() + timedelta(hours=12):
+        if (self.order.status == Order.STATUS_PENDING and self.order.expires > now() + timedelta(hours=12)) or not lock:
             # Performance optimization. In this case, there's really no reason to lock everything and an atomic
             # database transaction is more than enough.
-            with transaction.atomic():
-                self._mark_paid(force, count_waitinglist, user, auth, overpaid=payment_sum - refund_sum > self.order.total)
+            lockfn = NoLockManager
         else:
-            with self.order.event.lock():
-                self._mark_paid(force, count_waitinglist, user, auth, overpaid=payment_sum - refund_sum > self.order.total)
+            lockfn = self.order.event.lock
+
+        with lockfn():
+            self._mark_paid(force, count_waitinglist, user, auth, overpaid=payment_sum - refund_sum > self.order.total,
+                            ignore_date=ignore_date)
 
         invoice = None
         if invoice_qualified(self.order):
@@ -1242,35 +1269,77 @@ class OrderPayment(models.Model):
                 )
 
         if send_mail:
-            with language(self.order.locale):
-                try:
-                    invoice_name = self.order.invoice_address.name
-                    invoice_company = self.order.invoice_address.company
-                except InvoiceAddress.DoesNotExist:
-                    invoice_name = ""
-                    invoice_company = ""
-                email_template = self.order.event.settings.mail_text_order_paid
-                email_context = {
-                    'event': self.order.event.name,
-                    'url': build_absolute_uri(self.order.event, 'presale:event.order', kwargs={
-                        'order': self.order.code,
-                        'secret': self.order.secret
-                    }),
-                    'downloads': self.order.event.settings.get('ticket_download', as_type=bool),
-                    'invoice_name': invoice_name,
-                    'invoice_company': invoice_company,
-                    '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,
-                        'pretix.event.order.email.order_paid', user,
-                        invoices=[invoice] if invoice and self.order.event.settings.invoice_email_attachment else [],
-                        attach_tickets=True
-                    )
-                except SendMailException:
-                    logger.exception('Order paid email could not be sent')
+            self._send_paid_mail(invoice, user, mail_text)
+            if self.order.event.settings.mail_send_order_paid_attendee:
+                for p in self.order.positions.all():
+                    if p.addon_to_id is None and p.attendee_email and p.attendee_email != self.order.email:
+                        self._send_paid_mail_attendee(p, user)
+
+    def _send_paid_mail_attendee(self, position, user):
+        from pretix.base.services.mail import SendMailException
+        from pretix.multidomain.urlreverse import build_absolute_uri
+
+        with language(self.order.locale):
+            name_scheme = PERSON_NAME_SCHEMES[self.order.event.settings.name_scheme]
+            email_template = self.order.event.settings.mail_text_order_paid_attendee
+            email_context = {
+                'event': self.order.event.name,
+                'downloads': self.order.event.settings.get('ticket_download', as_type=bool),
+                'url': build_absolute_uri(self.order.event, 'presale:event.order.position', kwargs={
+                    'order': self.order.code,
+                    'secret': position.web_secret,
+                    'position': position.positionid
+                }),
+                'attendee_name': position.attendee_name,
+            }
+            for f, l, w in name_scheme['fields']:
+                email_context['attendee_name_%s' % f] = position.attendee_name_parts.get(f, '')
+
+            email_subject = _('Event registration confirmed: %(code)s') % {'code': self.order.code}
+            try:
+                self.order.send_mail(
+                    email_subject, email_template, email_context,
+                    'pretix.event.order.email.order_paid', user,
+                    invoices=[], position=position,
+                    attach_tickets=True
+                )
+            except SendMailException:
+                logger.exception('Order paid email could not be sent')
+
+    def _send_paid_mail(self, invoice, user, mail_text):
+        from pretix.base.services.mail import SendMailException
+        from pretix.multidomain.urlreverse import build_absolute_uri
+
+        with language(self.order.locale):
+            try:
+                invoice_name = self.order.invoice_address.name
+                invoice_company = self.order.invoice_address.company
+            except InvoiceAddress.DoesNotExist:
+                invoice_name = ""
+                invoice_company = ""
+            email_template = self.order.event.settings.mail_text_order_paid
+            email_context = {
+                'event': self.order.event.name,
+                'url': build_absolute_uri(self.order.event, 'presale:event.order.open', kwargs={
+                    'order': self.order.code,
+                    'secret': self.order.secret,
+                    'hash': self.order.email_confirm_hash()
+                }),
+                'downloads': self.order.event.settings.get('ticket_download', as_type=bool),
+                'invoice_name': invoice_name,
+                'invoice_company': invoice_company,
+                '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,
+                    'pretix.event.order.email.order_paid', user,
+                    invoices=[invoice] if invoice and self.order.event.settings.invoice_email_attachment else [],
+                    attach_tickets=True
+                )
+            except SendMailException:
+                logger.exception('Order paid email could not be sent')
 
     @property
     def refunded_amount(self):
@@ -1659,6 +1728,7 @@ class OrderPosition(AbstractPosition):
         verbose_name=_('Tax value')
     )
     secret = models.CharField(max_length=64, default=generate_position_secret, db_index=True)
+    web_secret = models.CharField(max_length=32, default=generate_secret, db_index=True)
     pseudonymization_id = models.CharField(
         max_length=16,
         unique=True,
@@ -1782,6 +1852,60 @@ class OrderPosition(AbstractPosition):
     def event(self):
         return self.order.event
 
+    def send_mail(self, subject: str, template: Union[str, LazyI18nString],
+                  context: Dict[str, Any]=None, log_entry_type: str='pretix.event.order.email.sent',
+                  user: User=None, headers: dict=None, sender: str=None, invoices: list=None,
+                  auth=None, attach_tickets=False):
+        """
+        Sends an email to the user that placed this order. Basically, this method does two things:
+
+        * Call ``pretix.base.services.mail.mail`` with useful values for the ``event``, ``locale``, ``recipient`` and
+          ``order`` 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.
+        :param attach_tickets: Attach tickets of this order, if they are existing and ready to download
+        """
+        from pretix.base.services.mail import SendMailException, mail, render_mail
+
+        if not self.email:
+            return
+
+        for k, v in self.event.meta_data.items():
+            context['meta_' + k] = v
+
+        with language(self.locale):
+            recipient = self.email
+            try:
+                email_content = render_mail(template, context)
+                mail(
+                    recipient, subject, template, context,
+                    self.event, self.locale, self, headers, sender,
+                    invoices=invoices, attach_tickets=attach_tickets
+                )
+            except SendMailException:
+                raise
+            else:
+                self.log_action(
+                    log_entry_type,
+                    user=user,
+                    auth=auth,
+                    data={
+                        'subject': subject,
+                        'message': email_content,
+                        'recipient': recipient,
+                        'invoices': [i.pk for i in invoices] if invoices else [],
+                        'attach_tickets': attach_tickets,
+                    }
+                )
+
 
 class CartPosition(AbstractPosition):
     """

src/pretix/base/models/tax.py

@@ -118,6 +118,9 @@ class TaxRule(LoggedModel):
     )
     custom_rules = models.TextField(blank=True, null=True)
 
+    class Meta:
+        ordering = ('event', 'rate', 'id')
+
     def allow_delete(self):
         from pretix.base.models.orders import OrderFee, OrderPosition
 

src/pretix/base/models/vouchers.py

@@ -344,6 +344,8 @@ class Voucher(LoggedModel):
         a variation).
         """
         if self.quota_id:
+            if variation:
+                return variation.quotas.filter(pk=self.quota_id).exists()
             return item.quotas.filter(pk=self.quota_id).exists()
         if self.item_id and not self.variation_id:
             return self.item_id == item.pk

src/pretix/base/payment.py

@@ -721,13 +721,10 @@ class BoxOfficeProvider(BasePaymentProvider):
         return False
 
     def payment_control_render(self, request, payment) -> str:
-        template = None
-        payment_info = None
-
-        if payment.info:
-            payment_info = json.loads(payment.info)
-            if payment_info['payment_type'] == "sumup":
-                template = get_template('pretixcontrol/boxoffice/payment_sumup.html')
+        if not payment.info:
+            return
+        payment_info = json.loads(payment.info)
+        template = get_template('pretixcontrol/boxoffice/payment.html')
 
         ctx = {
             'request': request,
@@ -737,11 +734,7 @@ class BoxOfficeProvider(BasePaymentProvider):
             'payment': payment,
             'provider': self,
         }
-
-        if template:
-            return template.render(ctx)
-        else:
-            return
+        return template.render(ctx)
 
 
 class ManualPayment(BasePaymentProvider):

src/pretix/base/pdf.py

@@ -87,6 +87,15 @@ DEFAULT_VARIABLES = OrderedDict((
         "editor_sample": _("123.45 EUR"),
         "evaluate": lambda op, order, event: money_filter(op.price, event.currency)
     }),
+    ("price_with_addons", {
+        "label": _("Price including add-ons"),
+        "editor_sample": _("123.45 EUR"),
+        "evaluate": lambda op, order, event: money_filter(op.price + sum(
+            p.price
+            for p in op.addons.all()
+            if not p.canceled
+        ), event.currency)
+    }),
     ("attendee_name", {
         "label": _("Attendee name"),
         "editor_sample": _("John Doe"),

src/pretix/base/plugins.py

@@ -1,8 +1,10 @@
+import sys
 from enum import Enum
 from typing import List
 
-from django.apps import apps
+from django.apps import AppConfig, apps
 from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured
 
 
 class PluginType(Enum):
@@ -39,3 +41,22 @@ def get_all_plugins(event=None) -> List[type]:
         plugins,
         key=lambda m: (0 if m.module.startswith('pretix.') else 1, str(m.name).lower().replace('pretix ', ''))
     )
+
+
+class PluginConfig(AppConfig):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        if not hasattr(self, 'PretixPluginMeta'):
+            raise ImproperlyConfigured("A pretix plugin config should have a PretixPluginMeta inner class.")
+
+        if hasattr(self.PretixPluginMeta, 'compatibility'):
+            import pkg_resources
+            try:
+                pkg_resources.require(self.PretixPluginMeta.compatibility)
+            except pkg_resources.VersionConflict as e:
+                print("Incompatible plugins found!")
+                print("Plugin {} requires you to have {}, but you installed {}.".format(
+                    self.name, e.req, e.dist
+                ))
+                sys.exit(1)

src/pretix/base/reldate.py

@@ -71,7 +71,7 @@ class RelativeDateWrapper:
             else:
                 base_date = getattr(event, self.data.base_date_name) or event.date_from
 
-            oldoffset = base_date.utcoffset()
+            oldoffset = base_date.astimezone(tz).utcoffset()
             new_date = base_date.astimezone(tz) - datetime.timedelta(days=self.data.days_before)
             if self.data.time:
                 new_date = new_date.replace(

src/pretix/base/services/cart.py

@@ -1,14 +1,14 @@
 from collections import Counter, defaultdict, namedtuple
-from datetime import timedelta
+from datetime import datetime, time, timedelta
 from decimal import Decimal
 from typing import List, Optional
 
 from celery.exceptions import MaxRetriesExceededError
 from django.core.exceptions import ValidationError
-from django.db import transaction
+from django.db import DatabaseError, transaction
 from django.db.models import Q
 from django.dispatch import receiver
-from django.utils.timezone import now
+from django.utils.timezone import make_aware, now
 from django.utils.translation import pgettext_lazy, ugettext as _
 
 from pretix.base.i18n import language
@@ -19,8 +19,9 @@ from pretix.base.models import (
 from pretix.base.models.event import SubEvent
 from pretix.base.models.orders import OrderFee
 from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule
+from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.services.checkin import _save_answers
-from pretix.base.services.locking import LockTimeoutException
+from pretix.base.services.locking import LockTimeoutException, NoLockManager
 from pretix.base.services.pricing import get_price
 from pretix.base.services.tasks import ProfiledTask
 from pretix.base.settings import PERSON_NAME_SCHEMES
@@ -134,6 +135,15 @@ class CartManager:
             raise CartError(error_messages['not_started'])
         if self.event.presale_has_ended:
             raise CartError(error_messages['ended'])
+        if not self.event.has_subevents:
+            tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+            if tlv:
+                term_last = make_aware(datetime.combine(
+                    tlv.datetime(self.event).date(),
+                    time(hour=23, minute=59, second=59)
+                ), self.event.timezone)
+                if term_last < self.now_dt:
+                    raise CartError(error_messages['ended'])
 
     def _extend_expiry_of_valid_existing_positions(self):
         # Extend this user's cart session to ensure all items in the cart expire at the same time
@@ -152,6 +162,18 @@ class CartManager:
                 err = error_messages['some_subevent_ended']
                 cp.addons.all().delete()
                 cp.delete()
+
+            if cp.subevent:
+                tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+                if tlv:
+                    term_last = make_aware(datetime.combine(
+                        tlv.datetime(cp.subevent).date(),
+                        time(hour=23, minute=59, second=59)
+                    ), self.event.timezone)
+                    if term_last < self.now_dt:
+                        err = error_messages['some_subevent_ended']
+                        cp.addons.all().delete()
+                        cp.delete()
         return err
 
     def _update_subevents_cache(self, se_ids: List[int]):
@@ -216,6 +238,16 @@ class CartManager:
             if op.subevent and op.subevent.presale_has_ended:
                 raise CartError(error_messages['ended'])
 
+            if op.subevent:
+                tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+                if tlv:
+                    term_last = make_aware(datetime.combine(
+                        tlv.datetime(op.subevent).date(),
+                        time(hour=23, minute=59, second=59)
+                    ), self.event.timezone)
+                    if term_last < self.now_dt:
+                        raise CartError(error_messages['ended'])
+
         if isinstance(op, self.AddOperation):
             if op.item.category and op.item.category.is_addon and not (op.addon_to and op.addon_to != 'FAKE'):
                 raise CartError(error_messages['addon_only'])
@@ -276,6 +308,10 @@ class CartManager:
         err = None
         changed_prices = {}
         for cp in expired:
+            removed_positions = {op.position.pk for op in self._operations if isinstance(op, self.RemoveOperation)}
+            if cp.pk in removed_positions or (cp.addon_to_id and cp.addon_to_id in removed_positions):
+                continue
+
             if cp.is_bundled:
                 try:
                     bundle = cp.addon_to.item.bundles.get(bundled_item=cp.item, bundled_variation=cp.variation)
@@ -598,7 +634,7 @@ class CartManager:
                 Q(voucher=voucher) & Q(event=self.event) &
                 Q(expires__gte=self.now_dt)
             ).exclude(pk__in=[
-                op.position.voucher_id for op in self._operations if isinstance(op, self.ExtendOperation)
+                op.position.id for op in self._operations if isinstance(op, self.ExtendOperation)
             ])
             cart_count = redeemed_in_carts.count()
             v_avail = voucher.max_usages - voucher.redeemed - cart_count
@@ -755,7 +791,11 @@ class CartManager:
                     if available_count == 1:
                         op.position.expires = self._expiry
                         op.position.price = op.price.gross
-                        op.position.save()
+                        try:
+                            op.position.save(force_update=True)
+                        except DatabaseError:
+                            # Best effort... The position might have been deleted in the meantime!
+                            pass
                     elif available_count == 0:
                         op.position.addons.all().delete()
                         op.position.delete()
@@ -770,17 +810,33 @@ class CartManager:
         CartPosition.objects.bulk_create([p for p in new_cart_positions if not getattr(p, '_answers', None) and not p.pk])
         return err
 
+    def _require_locking(self):
+        if self._voucher_use_diff:
+            # If any vouchers are used, we lock to make sure we don't redeem them to often
+            return True
+
+        if self._quota_diff and any(q.size is not None for q in self._quota_diff):
+            # If any quotas are affected that are not unlimited, we lock
+            return True
+
+        return False
+
     def commit(self):
         self._check_presale_dates()
         self._check_max_cart_size()
         self._calculate_expiry()
 
-        with self.event.lock() as now_dt:
+        err = self._delete_out_of_timeframe()
+        err = self.extend_expired_positions() or err
+
+        lockfn = NoLockManager
+        if self._require_locking():
+            lockfn = self.event.lock
+
+        with lockfn() as now_dt:
             with transaction.atomic():
                 self.now_dt = now_dt
                 self._extend_expiry_of_valid_existing_positions()
-                err = self._delete_out_of_timeframe()
-                err = self.extend_expired_positions() or err
                 err = self._perform_operations() or err
             if err:
                 raise CartError(err)

src/pretix/base/services/export.py

@@ -2,15 +2,20 @@ from typing import Any, Dict
 
 from django.core.files.base import ContentFile
 from django.utils.timezone import override
+from django.utils.translation import ugettext
 
-from pretix.base.i18n import language
+from pretix.base.i18n import LazyLocaleException, language
 from pretix.base.models import CachedFile, Event, cachedfile_name
 from pretix.base.services.tasks import ProfiledTask
 from pretix.base.signals import register_data_exporters
 from pretix.celery_app import app
 
 
-@app.task(base=ProfiledTask)
+class ExportError(LazyLocaleException):
+    pass
+
+
+@app.task(base=ProfiledTask, throws=(ExportError,))
 def export(event: str, fileid: str, provider: str, form_data: Dict[str, Any]) -> None:
     event = Event.objects.get(id=event)
     file = CachedFile.objects.get(id=fileid)
@@ -19,7 +24,12 @@ def export(event: str, fileid: str, provider: str, form_data: Dict[str, Any]) ->
         for receiver, response in responses:
             ex = response(event)
             if ex.identifier == provider:
-                file.filename, file.type, data = ex.render(form_data)
+                d = ex.render(form_data)
+                if d is None:
+                    raise ExportError(
+                        ugettext('Your export did not contain any data.')
+                    )
+                file.filename, file.type, data = d
                 file.file.save(cachedfile_name(file, file.filename), ContentFile(data))
                 file.save()
     return file.pk

src/pretix/base/services/invoices.py

@@ -120,7 +120,7 @@ def build_invoice(invoice: Invoice) -> Invoice:
         positions = list(
             invoice.order.positions.select_related('addon_to', 'item', 'tax_rule', 'subevent', 'variation').annotate(
                 addon_c=Count('addons')
-            )
+            ).order_by('positionid', 'id')
         )
 
         reverse_charge = False
@@ -257,7 +257,8 @@ def invoice_pdf_task(invoice: int):
 
 
 def invoice_qualified(order: Order):
-    if order.total == Decimal('0.00') or order.require_approval:
+    if order.total == Decimal('0.00') or order.require_approval or \
+            order.sales_channel not in order.event.settings.get('invoice_generate_sales_channels'):
         return False
     return True
 

src/pretix/base/services/locking.py

@@ -13,6 +13,18 @@ logger = logging.getLogger('pretix.base.locking')
 LOCK_TIMEOUT = 120
 
 
+class NoLockManager:
+    def __init__(self):
+        pass
+
+    def __enter__(self):
+        return now()
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if exc_type is not None:
+            return False
+
+
 class LockManager:
     def __init__(self, event):
         self.event = event

src/pretix/base/services/mail.py

@@ -1,5 +1,6 @@
 import logging
 import smtplib
+import warnings
 from email.utils import formataddr
 from typing import Any, Dict, List, Union
 
@@ -13,8 +14,11 @@ from i18nfield.strings import LazyI18nString
 
 from pretix.base.email import ClassicMailRenderer
 from pretix.base.i18n import language
-from pretix.base.models import Event, Invoice, InvoiceAddress, Order
+from pretix.base.models import (
+    Event, Invoice, InvoiceAddress, Order, OrderPosition,
+)
 from pretix.base.services.invoices import invoice_pdf_task
+from pretix.base.services.tasks import TransactionAwareTask
 from pretix.base.services.tickets import get_tickets_for_order
 from pretix.base.signals import email_filter
 from pretix.celery_app import app
@@ -37,8 +41,8 @@ class SendMailException(Exception):
 
 def mail(email: str, subject: str, template: Union[str, LazyI18nString],
          context: Dict[str, Any]=None, event: Event=None, locale: str=None,
-         order: Order=None, headers: dict=None, sender: str=None, invoices: list=None,
-         attach_tickets=False):
+         order: Order=None, position: OrderPosition=None, headers: dict=None, sender: str=None,
+         invoices: list=None, attach_tickets=False):
     """
     Sends out an email to a user. The mail will be sent synchronously or asynchronously depending on the installation.
 
@@ -59,6 +63,9 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
     :param order: The order this email is related to (optional). If set, this will be used to include a link to the
         order below the email.
 
+    :param order: The order position this email is related to (optional). If set, this will be used to include a link
+        to the order position instead of the order below the email.
+
     :param headers: A dict of custom mail headers to add to the mail
 
     :param locale: The locale to be used while evaluating the subject and the template
@@ -99,7 +106,8 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
         subject = str(subject).format_map(context)
         sender = sender or (event.settings.get('mail_from') if event else settings.MAIL_FROM)
         if event:
-            sender = formataddr((str(event.name), sender))
+            sender_name = event.settings.mail_from_name or str(event.name)
+            sender = formataddr((sender_name, sender))
         else:
             sender = formataddr((settings.PRETIX_INSTANCE_NAME, sender))
 
@@ -110,7 +118,8 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
         if event:
             renderer = event.get_html_mail_renderer()
             if event.settings.mail_bcc:
-                bcc.append(event.settings.mail_bcc)
+                for bcc_mail in event.settings.mail_bcc.split(','):
+                    bcc.append(bcc_mail.strip())
 
             if event.settings.mail_from == settings.DEFAULT_FROM_EMAIL and event.settings.contact_mail and not headers.get('Reply-To'):
                 headers['Reply-To'] = event.settings.contact_mail
@@ -129,9 +138,26 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
                 body_plain += signature
                 body_plain += "\r\n\r\n-- \r\n"
 
-            if order:
-                if order.testmode:
-                    subject = "[TESTMODE] " + subject
+            if order and order.testmode:
+                subject = "[TESTMODE] " + subject
+
+            if order and position:
+                body_plain += _(
+                    "You are receiving this email because someone placed an order for {event} for you."
+                ).format(event=event.name)
+                body_plain += "\r\n"
+                body_plain += _(
+                    "You can view your order details at the following URL:\n{orderurl}."
+                ).replace("\n", "\r\n").format(
+                    event=event.name, orderurl=build_absolute_uri(
+                        order.event, 'presale:event.order.position', kwargs={
+                            'order': order.code,
+                            'secret': position.web_secret,
+                            'position': position.positionid,
+                        }
+                    )
+                )
+            elif order:
                 body_plain += _(
                     "You are receiving this email because you placed an order for {event}."
                 ).format(event=event.name)
@@ -140,16 +166,24 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
                     "You can view your order details at the following URL:\n{orderurl}."
                 ).replace("\n", "\r\n").format(
                     event=event.name, orderurl=build_absolute_uri(
-                        order.event, 'presale:event.order', kwargs={
+                        order.event, 'presale:event.order.open', kwargs={
                             'order': order.code,
-                            'secret': order.secret
+                            'secret': order.secret,
+                            'hash': order.email_confirm_hash()
                         }
                     )
                 )
             body_plain += "\r\n"
 
         try:
-            body_html = renderer.render(content_plain, signature, str(subject), order)
+            try:
+                body_html = renderer.render(content_plain, signature, str(subject), order, position)
+            except TypeError:
+                # Backwards compatibility
+                warnings.warn('E-mail renderer called without position argument because position argument is not '
+                              'supported.',
+                              DeprecationWarning)
+                body_html = renderer.render(content_plain, signature, str(subject), order)
         except:
             logger.exception('Could not render HTML body')
             body_html = None
@@ -163,8 +197,9 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
             sender=sender,
             event=event.id if event else None,
             headers=headers,
-            invoices=[i.pk for i in invoices] if invoices else [],
+            invoices=[i.pk for i in invoices] if invoices and not position else [],
             order=order.pk if order else None,
+            position=position.pk if position else None,
             attach_tickets=attach_tickets
         )
 
@@ -177,10 +212,10 @@ def mail(email: str, subject: str, template: Union[str, LazyI18nString],
         chain(*task_chain).apply_async()
 
 
-@app.task(bind=True)
+@app.task(base=TransactionAwareTask, bind=True)
 def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: str, sender: str,
-                   event: int=None, headers: dict=None, bcc: List[str]=None, invoices: List[int]=None,
-                   order: int=None, attach_tickets=False) -> bool:
+                   event: int=None, position: int=None, headers: dict=None, bcc: List[str]=None,
+                   invoices: List[int]=None, order: int=None, attach_tickets=False) -> bool:
     email = EmailMultiAlternatives(subject, body, sender, to=to, bcc=bcc, headers=headers)
     if html is not None:
         email.attach_alternative(html, "text/html")
@@ -211,16 +246,36 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
             except Order.DoesNotExist:
                 order = None
             else:
+                if position:
+                    try:
+                        position = order.positions.get(pk=position)
+                    except OrderPosition.DoesNotExist:
+                        attach_tickets = False
                 if attach_tickets:
-                    for name, ct in get_tickets_for_order(order):
-                        try:
-                            email.attach(
-                                name,
-                                ct.file.read(),
-                                ct.type
-                            )
-                        except:
-                            pass
+                    args = []
+                    attach_size = 0
+                    for name, ct in get_tickets_for_order(order, base_position=position):
+                        content = ct.file.read()
+                        args.append((name, content, ct.type))
+                        attach_size += len(content)
+
+                    if attach_size < 4 * 1024 * 1024:
+                        # Do not attach more than 4MB, it will bounce way to often.
+                        for a in args:
+                            try:
+                                email.attach(*a)
+                            except:
+                                pass
+                    else:
+                        order.log_action(
+                            'pretix.event.order.email.attachments.skipped',
+                            data={
+                                'subject': 'Attachments skipped',
+                                'message': 'Attachment have not been send because {} bytes are likely too large to arrive.'.format(attach_size),
+                                'recipient': '',
+                                'invoices': [],
+                            }
+                        )
 
         email = email_filter.send_chained(event, 'message', message=email, order=order)
 

src/pretix/base/services/notifications.py

@@ -104,7 +104,11 @@ def send_notification_mail(notification: Notification, user: User):
 
     mail_send_task.apply_async(kwargs={
         'to': [user.email],
-        'subject': '[{}] {}'.format(settings.PRETIX_INSTANCE_NAME, notification.title),
+        'subject': '[{}] {}: {}'.format(
+            settings.PRETIX_INSTANCE_NAME,
+            notification.event.settings.mail_prefix or notification.event.slug.upper(),
+            notification.title
+        ),
         'body': body_plain,
         'html': body_html,
         'sender': settings.MAIL_FROM,

src/pretix/base/services/orders.py

@@ -1,7 +1,7 @@
 import json
 import logging
 from collections import Counter, namedtuple
-from datetime import datetime, timedelta
+from datetime import datetime, time, timedelta
 from decimal import Decimal
 from typing import List, Optional
 
@@ -14,7 +14,7 @@ from django.db.models.functions import Greatest
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.functional import cached_property
-from django.utils.timezone import now
+from django.utils.timezone import make_aware, now
 from django.utils.translation import ugettext as _
 
 from pretix.api.models import OAuthApplication
@@ -28,21 +28,26 @@ from pretix.base.models import (
 from pretix.base.models.event import SubEvent
 from pretix.base.models.items import ItemBundle
 from pretix.base.models.orders import (
-    CachedCombinedTicket, CachedTicket, InvoiceAddress, OrderFee, OrderRefund,
-    generate_position_secret, generate_secret,
+    InvoiceAddress, OrderFee, OrderRefund, generate_position_secret,
+    generate_secret,
 )
 from pretix.base.models.organizer import TeamAPIToken
 from pretix.base.models.tax import TaxedPrice
 from pretix.base.payment import BasePaymentProvider, PaymentException
+from pretix.base.reldate import RelativeDateWrapper
+from pretix.base.services import tickets
 from pretix.base.services.invoices import (
     generate_cancellation, generate_invoice, invoice_qualified,
 )
-from pretix.base.services.locking import LockTimeoutException
+from pretix.base.services.locking import LockTimeoutException, NoLockManager
 from pretix.base.services.mail import SendMailException
 from pretix.base.services.pricing import get_price
 from pretix.base.services.tasks import ProfiledTask
+from pretix.base.settings import PERSON_NAME_SCHEMES
 from pretix.base.signals import (
-    allow_ticket_download, order_fee_calculation, order_placed, periodic_task,
+    allow_ticket_download, order_approved, order_canceled, order_changed,
+    order_denied, order_expired, order_fee_calculation, order_placed,
+    periodic_task, validate_order,
 )
 from pretix.celery_app import app
 from pretix.helpers.models import modelcopy
@@ -134,55 +139,58 @@ def mark_order_refunded(order, user=None, auth=None, api_token=None):
     )
 
 
-@transaction.atomic
 def mark_order_expired(order, user=None, auth=None):
     """
     Mark this order as expired. This sets the payment status and returns the order object.
     :param order: The order to change
     :param user: The user that performed the change
     """
-    if isinstance(order, int):
-        order = Order.objects.get(pk=order)
-    if isinstance(user, int):
-        user = User.objects.get(pk=user)
-    with order.event.lock():
-        order.status = Order.STATUS_EXPIRED
-        order.save(update_fields=['status'])
+    with transaction.atomic():
+        if isinstance(order, int):
+            order = Order.objects.get(pk=order)
+        if isinstance(user, int):
+            user = User.objects.get(pk=user)
+        with order.event.lock():
+            order.status = Order.STATUS_EXPIRED
+            order.save(update_fields=['status'])
 
-    order.log_action('pretix.event.order.expired', user=user, auth=auth)
-    i = order.invoices.filter(is_cancellation=False).last()
-    if i:
-        generate_cancellation(i)
+        order.log_action('pretix.event.order.expired', user=user, auth=auth)
+        i = order.invoices.filter(is_cancellation=False).last()
+        if i:
+            generate_cancellation(i)
 
+    order_expired.send(order.event, order=order)
     return order
 
 
-@transaction.atomic
-def approve_order(order, user=None, send_mail: bool=True, auth=None):
+def approve_order(order, user=None, send_mail: bool=True, auth=None, force=False):
     """
     Mark this order as approved
     :param order: The order to change
     :param user: The user that performed the change
     """
-    if not order.require_approval or not order.status == Order.STATUS_PENDING:
-        raise OrderError(_('This order is not pending approval.'))
+    with transaction.atomic():
+        if not order.require_approval or not order.status == Order.STATUS_PENDING:
+            raise OrderError(_('This order is not pending approval.'))
 
-    order.require_approval = False
-    order.set_expires(now(), order.event.subevents.filter(id__in=[p.subevent_id for p in order.positions.all()]))
-    order.save(update_fields=['require_approval', 'expires'])
+        order.require_approval = False
+        order.set_expires(now(), order.event.subevents.filter(id__in=[p.subevent_id for p in order.positions.all()]))
+        order.save(update_fields=['require_approval', 'expires'])
 
-    order.log_action('pretix.event.order.approved', user=user, auth=auth)
-    if order.total == Decimal('0.00'):
-        p = order.payments.create(
-            state=OrderPayment.PAYMENT_STATE_CREATED,
-            provider='free',
-            amount=0,
-            fee=None
-        )
-        try:
-            p.confirm(send_mail=False, count_waitinglist=False, user=user, auth=auth)
-        except Quota.QuotaExceededException:
-            raise OrderError(error_messages['unavailable'])
+        order.log_action('pretix.event.order.approved', user=user, auth=auth)
+        if order.total == Decimal('0.00'):
+            p = order.payments.create(
+                state=OrderPayment.PAYMENT_STATE_CREATED,
+                provider='free',
+                amount=0,
+                fee=None
+            )
+            try:
+                p.confirm(send_mail=False, count_waitinglist=False, user=user, auth=auth, ignore_date=True, force=force)
+            except Quota.QuotaExceededException:
+                raise OrderError(error_messages['unavailable'])
+
+    order_approved.send(order.event, order=order)
 
     invoice = order.invoices.last()  # Might be generated by plugin already
     if order.event.settings.get('invoice_generate') == 'True' and invoice_qualified(order):
@@ -215,9 +223,10 @@ def approve_order(order, user=None, send_mail: bool=True, auth=None):
                 'total_with_currency': LazyCurrencyNumber(order.total, order.event.currency),
                 'date': LazyDate(order.expires),
                 'event': order.event.name,
-                'url': build_absolute_uri(order.event, 'presale:event.order', kwargs={
+                'url': build_absolute_uri(order.event, 'presale:event.order.open', kwargs={
                     'order': order.code,
-                    'secret': order.secret
+                    'secret': order.secret,
+                    'hash': order.email_confirm_hash()
                 }),
                 'invoice_name': invoice_name,
                 'invoice_company': invoice_company,
@@ -234,30 +243,32 @@ def approve_order(order, user=None, send_mail: bool=True, auth=None):
     return order.pk
 
 
-@transaction.atomic
 def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
     """
     Mark this order as canceled
     :param order: The order to change
     :param user: The user that performed the change
     """
-    if not order.require_approval or not order.status == Order.STATUS_PENDING:
-        raise OrderError(_('This order is not pending approval.'))
+    with transaction.atomic():
+        if not order.require_approval or not order.status == Order.STATUS_PENDING:
+            raise OrderError(_('This order is not pending approval.'))
 
-    with order.event.lock():
-        order.status = Order.STATUS_CANCELED
-        order.save(update_fields=['status'])
+        with order.event.lock():
+            order.status = Order.STATUS_CANCELED
+            order.save(update_fields=['status'])
 
-    order.log_action('pretix.event.order.denied', user=user, auth=auth, data={
-        'comment': comment
-    })
-    i = order.invoices.filter(is_cancellation=False).last()
-    if i:
-        generate_cancellation(i)
+        order.log_action('pretix.event.order.denied', user=user, auth=auth, data={
+            'comment': comment
+        })
+        i = order.invoices.filter(is_cancellation=False).last()
+        if i:
+            generate_cancellation(i)
 
-    for position in order.positions.all():
-        if position.voucher:
-            Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
+        for position in order.positions.all():
+            if position.voucher:
+                Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
+
+    order_denied.send(order.event, order=order)
 
     if send_mail:
         try:
@@ -273,9 +284,10 @@ def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
             'total_with_currency': LazyCurrencyNumber(order.total, order.event.currency),
             'date': LazyDate(order.expires),
             'event': order.event.name,
-            'url': build_absolute_uri(order.event, 'presale:event.order', kwargs={
+            'url': build_absolute_uri(order.event, 'presale:event.order.open', kwargs={
                 'order': order.code,
-                'secret': order.secret
+                'secret': order.secret,
+                'hash': order.email_confirm_hash()
             }),
             'comment': comment,
             'invoice_name': invoice_name,
@@ -294,7 +306,6 @@ def deny_order(order, comment='', user=None, send_mail: bool=True, auth=None):
     return order.pk
 
 
-@transaction.atomic
 def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device=None, oauth_application=None,
                   cancellation_fee=None):
     """
@@ -302,85 +313,88 @@ def _cancel_order(order, user=None, send_mail: bool=True, api_token=None, device
     :param order: The order to change
     :param user: The user that performed the change
     """
-    if isinstance(order, int):
-        order = Order.objects.get(pk=order)
-    if isinstance(user, int):
-        user = User.objects.get(pk=user)
-    if isinstance(api_token, int):
-        api_token = TeamAPIToken.objects.get(pk=api_token)
-    if isinstance(device, int):
-        device = Device.objects.get(pk=device)
-    if isinstance(oauth_application, int):
-        oauth_application = OAuthApplication.objects.get(pk=oauth_application)
-    if isinstance(cancellation_fee, str):
-        cancellation_fee = Decimal(cancellation_fee)
+    with transaction.atomic():
+        if isinstance(order, int):
+            order = Order.objects.get(pk=order)
+        if isinstance(user, int):
+            user = User.objects.get(pk=user)
+        if isinstance(api_token, int):
+            api_token = TeamAPIToken.objects.get(pk=api_token)
+        if isinstance(device, int):
+            device = Device.objects.get(pk=device)
+        if isinstance(oauth_application, int):
+            oauth_application = OAuthApplication.objects.get(pk=oauth_application)
+        if isinstance(cancellation_fee, str):
+            cancellation_fee = Decimal(cancellation_fee)
 
-    if not order.cancel_allowed():
-        raise OrderError(_('You cannot cancel this order.'))
-    i = order.invoices.filter(is_cancellation=False).last()
-    if i:
-        generate_cancellation(i)
+        if not order.cancel_allowed():
+            raise OrderError(_('You cannot cancel this order.'))
+        i = order.invoices.filter(is_cancellation=False).last()
+        if i:
+            generate_cancellation(i)
+
+        if cancellation_fee:
+            with order.event.lock():
+                for position in order.positions.all():
+                    if position.voucher:
+                        Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
+                    position.canceled = True
+                    position.save(update_fields=['canceled'])
+                for fee in order.fees.all():
+                    fee.canceled = True
+                    fee.save(update_fields=['canceled'])
+
+                f = OrderFee(
+                    fee_type=OrderFee.FEE_TYPE_CANCELLATION,
+                    value=cancellation_fee,
+                    tax_rule=order.event.settings.tax_rate_default,
+                    order=order,
+                )
+                f._calculate_tax()
+                f.save()
+
+                if order.payment_refund_sum < cancellation_fee:
+                    raise OrderError(_('The cancellation fee cannot be higher than the payment credit of this order.'))
+                order.status = Order.STATUS_PAID
+                order.total = f.value
+                order.save(update_fields=['status', 'total'])
+
+            if i:
+                generate_invoice(order)
+        else:
+            with order.event.lock():
+                order.status = Order.STATUS_CANCELED
+                order.save(update_fields=['status'])
 
-    if cancellation_fee:
-        with order.event.lock():
             for position in order.positions.all():
                 if position.voucher:
                     Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
-                position.canceled = True
-                position.save(update_fields=['canceled'])
-            for fee in order.fees.all():
-                fee.canceled = True
-                fee.save(update_fields=['canceled'])
 
-            f = OrderFee(
-                fee_type=OrderFee.FEE_TYPE_CANCELLATION,
-                value=cancellation_fee,
-                tax_rule=order.event.settings.tax_rate_default,
-                order=order,
-            )
-            f._calculate_tax()
-            f.save()
+        order.log_action('pretix.event.order.canceled', user=user, auth=api_token or oauth_application or device,
+                         data={'cancellation_fee': cancellation_fee})
 
-            if order.payment_refund_sum < cancellation_fee:
-                raise OrderError(_('The cancellation fee cannot be higher than the payment credit of this order.'))
-            order.status = Order.STATUS_PAID
-            order.total = f.value
-            order.save(update_fields=['status', 'total'])
-
-        if i:
-            generate_invoice(order)
-    else:
-        with order.event.lock():
-            order.status = Order.STATUS_CANCELED
-            order.save(update_fields=['status'])
-
-        for position in order.positions.all():
-            if position.voucher:
-                Voucher.objects.filter(pk=position.voucher.pk).update(redeemed=Greatest(0, F('redeemed') - 1))
-
-    order.log_action('pretix.event.order.canceled', user=user, auth=api_token or oauth_application or device,
-                     data={'cancellation_fee': cancellation_fee})
-
-    if send_mail:
-        email_template = order.event.settings.mail_text_order_canceled
-        email_context = {
-            'event': order.event.name,
-            'code': order.code,
-            'url': build_absolute_uri(order.event, 'presale:event.order', kwargs={
-                'order': order.code,
-                'secret': order.secret
-            })
-        }
-        with language(order.locale):
-            email_subject = _('Order canceled: %(code)s') % {'code': order.code}
-            try:
-                order.send_mail(
-                    email_subject, email_template, email_context,
-                    'pretix.event.order.email.order_canceled', user
-                )
-            except SendMailException:
-                logger.exception('Order canceled email could not be sent')
+        if send_mail:
+            email_template = order.event.settings.mail_text_order_canceled
+            email_context = {
+                'event': order.event.name,
+                'code': order.code,
+                'url': build_absolute_uri(order.event, 'presale:event.order.open', kwargs={
+                    'order': order.code,
+                    'secret': order.secret,
+                    'hash': order.email_confirm_hash()
+                })
+            }
+            with language(order.locale):
+                email_subject = _('Order canceled: %(code)s') % {'code': order.code}
+                try:
+                    order.send_mail(
+                        email_subject, email_template, email_context,
+                        'pretix.event.order.email.order_canceled', user
+                    )
+                except SendMailException:
+                    logger.exception('Order canceled email could not be sent')
 
+    order_canceled.send(order.event, order=order)
     return order.pk
 
 
@@ -394,6 +408,16 @@ def _check_date(event: Event, now_dt: datetime):
     if event.presale_has_ended:
         raise OrderError(error_messages['ended'])
 
+    if not event.has_subevents:
+        tlv = event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+        if tlv:
+            term_last = make_aware(datetime.combine(
+                tlv.datetime(event).date(),
+                time(hour=23, minute=59, second=59)
+            ), event.timezone)
+            if term_last < now_dt:
+                raise OrderError(error_messages['ended'])
+
 
 def _check_positions(event: Event, now_dt: datetime, positions: List[CartPosition], address: InvoiceAddress=None):
     err = None
@@ -448,6 +472,18 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
             delete(cp)
             break
 
+        if cp.subevent:
+            tlv = event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+            if tlv:
+                term_last = make_aware(datetime.combine(
+                    tlv.datetime(cp.subevent).date(),
+                    time(hour=23, minute=59, second=59)
+                ), event.timezone)
+                if term_last < now_dt:
+                    err = err or error_messages['some_subevent_ended']
+                    delete(cp)
+                    break
+
         if cp.subevent and cp.subevent.presale_has_ended:
             err = err or error_messages['some_subevent_ended']
             delete(cp)
@@ -499,7 +535,6 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
                 continue
 
         if price.gross != cp.price and not (cp.item.free_price and cp.price > price.gross):
-            positions[i] = cp
             cp.price = price.gross
             cp.includes_tax = bool(price.rate)
             cp.save()
@@ -523,7 +558,6 @@ def _check_positions(event: Event, now_dt: datetime, positions: List[CartPositio
                     break
 
         if quota_ok:
-            positions[i] = cp
             cp.expires = now_dt + timedelta(
                 minutes=event.settings.get('reservation_time', as_type=int))
             cp.save()
@@ -559,6 +593,7 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
                   meta_info: dict=None, sales_channel: str='web'):
     fees, pf = _get_fees(positions, payment_provider, address, meta_info, event)
     total = sum([c.price for c in positions]) + sum([c.value for c in fees])
+    p = None
 
     with transaction.atomic():
         order = Order(
@@ -592,7 +627,7 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
             fee.save()
 
         if payment_provider and not order.require_approval:
-            order.payments.create(
+            p = order.payments.create(
                 state=OrderPayment.PAYMENT_STATE_CREATED,
                 provider=payment_provider.identifier,
                 amount=total,
@@ -608,7 +643,76 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
                 order.log_action('pretix.event.order.consent', data={'msg': msg})
 
     order_placed.send(event, order=order)
-    return order
+    return order, p
+
+
+def _order_placed_email(event: Event, order: Order, pprov: BasePaymentProvider, email_template, log_entry: str,
+                        invoice):
+    try:
+        invoice_name = order.invoice_address.name
+        invoice_company = order.invoice_address.company
+    except InvoiceAddress.DoesNotExist:
+        invoice_name = ""
+        invoice_company = ""
+
+    if pprov:
+        payment_info = str(pprov.order_pending_mail_render(order))
+    else:
+        payment_info = None
+
+    email_context = {
+        'total': LazyNumber(order.total),
+        'currency': event.currency,
+        'total_with_currency': LazyCurrencyNumber(order.total, event.currency),
+        'date': LazyDate(order.expires),
+        'event': event.name,
+        'url': build_absolute_uri(event, 'presale:event.order.open', kwargs={
+            'order': order.code,
+            'secret': order.secret,
+            'hash': order.email_confirm_hash()
+        }),
+        'payment_info': payment_info,
+        'invoice_name': invoice_name,
+        'invoice_company': invoice_company,
+    }
+    email_subject = _('Your order: %(code)s') % {'code': order.code}
+    try:
+        order.send_mail(
+            email_subject, email_template, email_context,
+            log_entry,
+            invoices=[invoice] if invoice and event.settings.invoice_email_attachment else [],
+            attach_tickets=True
+        )
+    except SendMailException:
+        logger.exception('Order received email could not be sent')
+
+
+def _order_placed_email_attendee(event: Event, order: Order, position: OrderPosition, email_template, log_entry: str):
+    name_scheme = PERSON_NAME_SCHEMES[event.settings.name_scheme]
+    email_context = {
+        'event': event.name,
+        'url': build_absolute_uri(event, 'presale:event.order.position', kwargs={
+            'order': order.code,
+            'secret': position.web_secret,
+            'position': position.positionid
+        }),
+        'attendee_name': position.attendee_name,
+    }
+    for f, l, w in name_scheme['fields']:
+        email_context['attendee_name_%s' % f] = position.attendee_name_parts.get(f, '')
+
+    email_subject = _('Your event registration: %(code)s') % {'code': order.code}
+
+    try:
+        order.send_mail(
+            email_subject, email_template, email_context,
+            log_entry,
+            invoices=[],
+            attach_tickets=True,
+            position=position
+        )
+    except SendMailException:
+        logger.exception('Order received email could not be sent to attendee')
 
 
 def _perform_order(event: str, payment_provider: str, position_ids: List[str],
@@ -632,16 +736,35 @@ def _perform_order(event: str, payment_provider: str, position_ids: List[str],
         except InvoiceAddress.DoesNotExist:
             pass
 
-    with event.lock() as now_dt:
-        positions = list(CartPosition.objects.filter(
-            id__in=position_ids).select_related('item', 'variation', 'subevent', 'addon_to').prefetch_related('addons'))
+    positions = CartPosition.objects.filter(id__in=position_ids, event=event)
+
+    validate_order.send(event, payment_provider=pprov, email=email, positions=positions,
+                        locale=locale, invoice_address=addr, meta_info=meta_info)
+
+    lockfn = NoLockManager
+    locked = False
+    if positions.filter(Q(voucher__isnull=False) | Q(expires__lt=now() + timedelta(minutes=2))).exists():
+        # Performance optimization: If no voucher is used and no cart position is dangerously close to its expiry date,
+        # creating this order shouldn't be prone to any race conditions and we don't need to lock the event.
+        locked = True
+        lockfn = event.lock
+
+    with lockfn() as now_dt:
+        positions = list(positions.select_related('item', 'variation', 'subevent', 'addon_to').prefetch_related('addons'))
         if len(positions) == 0:
             raise OrderError(error_messages['empty'])
         if len(position_ids) != len(positions):
             raise OrderError(error_messages['internal'])
         _check_positions(event, now_dt, positions, address=addr)
-        order = _create_order(event, email, positions, now_dt, pprov,
-                              locale=locale, address=addr, meta_info=meta_info, sales_channel=sales_channel)
+        order, payment = _create_order(event, email, positions, now_dt, pprov,
+                                       locale=locale, address=addr, meta_info=meta_info, sales_channel=sales_channel)
+
+        free_order_flow = payment and payment_provider == 'free' and order.total == Decimal('0.00') and not order.require_approval
+        if free_order_flow:
+            try:
+                payment.confirm(send_mail=False, lock=not locked)
+            except Quota.QuotaExceededException:
+                pass
 
     invoice = order.invoices.last()  # Might be generated by plugin already
     if event.settings.get('invoice_generate') == 'True' and invoice_qualified(order):
@@ -656,49 +779,26 @@ def _perform_order(event: str, payment_provider: str, position_ids: List[str],
         if order.require_approval:
             email_template = event.settings.mail_text_order_placed_require_approval
             log_entry = 'pretix.event.order.email.order_placed_require_approval'
-        elif payment_provider == 'free':
+
+            email_attendees = False
+        elif free_order_flow:
             email_template = event.settings.mail_text_order_free
             log_entry = 'pretix.event.order.email.order_free'
+
+            email_attendees = event.settings.mail_send_order_free_attendee
+            email_attendees_template = event.settings.mail_text_order_free_attendee
         else:
             email_template = event.settings.mail_text_order_placed
             log_entry = 'pretix.event.order.email.order_placed'
 
-        try:
-            invoice_name = order.invoice_address.name
-            invoice_company = order.invoice_address.company
-        except InvoiceAddress.DoesNotExist:
-            invoice_name = ""
-            invoice_company = ""
+            email_attendees = event.settings.mail_send_order_placed_attendee
+            email_attendees_template = event.settings.mail_text_order_placed_attendee
 
-        if pprov:
-            payment_info = str(pprov.order_pending_mail_render(order))
-        else:
-            payment_info = None
-
-        email_context = {
-            'total': LazyNumber(order.total),
-            'currency': event.currency,
-            'total_with_currency': LazyCurrencyNumber(order.total, event.currency),
-            'date': LazyDate(order.expires),
-            'event': event.name,
-            'url': build_absolute_uri(event, 'presale:event.order', kwargs={
-                'order': order.code,
-                'secret': order.secret
-            }),
-            'payment_info': payment_info,
-            'invoice_name': invoice_name,
-            'invoice_company': invoice_company,
-        }
-        email_subject = _('Your order: %(code)s') % {'code': order.code}
-        try:
-            order.send_mail(
-                email_subject, email_template, email_context,
-                log_entry,
-                invoices=[invoice] if invoice and event.settings.invoice_email_attachment else [],
-                attach_tickets=True
-            )
-        except SendMailException:
-            logger.exception('Order received email could not be sent')
+        _order_placed_email(event, order, pprov, email_template, log_entry, invoice)
+        if email_attendees:
+            for p in order.positions.all():
+                if p.addon_to_id is None and p.attendee_email and p.attendee_email != order.email:
+                    _order_placed_email_attendee(event, order, p, email_attendees_template, log_entry)
 
     return order.id
 
@@ -751,9 +851,10 @@ def send_expiry_warnings(sender, **kwargs):
                     email_template = eventsettings.mail_text_order_expire_warning
                     email_context = {
                         'event': o.event.name,
-                        'url': build_absolute_uri(o.event, 'presale:event.order', kwargs={
+                        'url': build_absolute_uri(o.event, 'presale:event.order.open', kwargs={
                             'order': o.code,
-                            'secret': o.secret
+                            'secret': o.secret,
+                            'hash': o.email_confirm_hash()
                         }),
                         'expire_date': date_format(o.expires.astimezone(tz), 'SHORT_DATE_FORMAT'),
                         'invoice_name': invoice_name,
@@ -802,9 +903,10 @@ def send_download_reminders(sender, **kwargs):
                     email_template = e.settings.mail_text_download_reminder
                     email_context = {
                         'event': o.event.name,
-                        'url': build_absolute_uri(o.event, 'presale:event.order', kwargs={
+                        'url': build_absolute_uri(o.event, 'presale:event.order.open', kwargs={
                             'order': o.code,
-                            'secret': o.secret
+                            'secret': o.secret,
+                            'hash': o.email_confirm_hash()
                         }),
                     }
                     email_subject = _('Your ticket is ready for download: %(code)s') % {'code': o.code}
@@ -817,6 +919,31 @@ def send_download_reminders(sender, **kwargs):
                     except SendMailException:
                         logger.exception('Reminder email could not be sent')
 
+                    if e.settings.mail_send_download_reminder_attendee:
+                        name_scheme = PERSON_NAME_SCHEMES[e.settings.name_scheme]
+                        for p in o.positions.all():
+                            if p.addon_to_id is None and p.attendee_email and p.attendee_email != o.email:
+                                email_template = e.settings.mail_text_download_reminder_attendee
+                                email_context = {
+                                    'event': e.name,
+                                    'url': build_absolute_uri(e, 'presale:event.order.position', kwargs={
+                                        'order': o.code,
+                                        'secret': p.web_secret,
+                                        'position': p.positionid
+                                    }),
+                                    'attendee_name': p.attendee_name,
+                                }
+                                for f, l, w in name_scheme['fields']:
+                                    email_context['attendee_name_%s' % f] = p.attendee_name_parts.get(f, '')
+                                try:
+                                    o.send_mail(
+                                        email_subject, email_template, email_context,
+                                        'pretix.event.order.email.download_reminder_sent',
+                                        attach_tickets=True, position=p
+                                    )
+                                except SendMailException:
+                                    logger.exception('Reminder email could not be sent to attendee')
+
 
 class OrderChangeManager:
     error_messages = {
@@ -832,8 +959,8 @@ class OrderChangeManager:
         'addon_invalid': _('The selected base position does not allow you to add this product as an add-on.'),
         'subevent_required': _('You need to choose a subevent for the new position.'),
     }
-    ItemOperation = namedtuple('ItemOperation', ('position', 'item', 'variation', 'price'))
-    SubeventOperation = namedtuple('SubeventOperation', ('position', 'subevent', 'price'))
+    ItemOperation = namedtuple('ItemOperation', ('position', 'item', 'variation'))
+    SubeventOperation = namedtuple('SubeventOperation', ('position', 'subevent'))
     PriceOperation = namedtuple('PriceOperation', ('position', 'price'))
     CancelOperation = namedtuple('CancelOperation', ('position',))
     AddOperation = namedtuple('AddOperation', ('item', 'variation', 'price', 'addon_to', 'subevent'))
@@ -844,6 +971,7 @@ class OrderChangeManager:
         self.order = order
         self.user = user
         self.auth = auth
+        self.event = order.event
         self.split_order = None
         self._committed = False
         self._totaldiff = 0
@@ -852,33 +980,18 @@ class OrderChangeManager:
         self.notify = notify
         self._invoice_dirty = False
 
-    def change_item(self, position: OrderPosition, item: Item, variation: Optional[ItemVariation], keep_price=False):
+    def change_item(self, position: OrderPosition, item: Item, variation: Optional[ItemVariation]):
         if (not variation and item.has_variations) or (variation and variation.item_id != item.pk):
             raise OrderError(self.error_messages['product_without_variation'])
 
-        if keep_price:
-            price = TaxedPrice(gross=position.price, net=position.price - position.tax_value,
-                               tax=position.tax_value, rate=position.tax_rate,
-                               name=position.tax_rule.name if position.tax_rule else None)
-        else:
-            price = get_price(item, variation, voucher=position.voucher, subevent=position.subevent,
-                              invoice_address=self._invoice_address)
-
-        if price is None:  # NOQA
-            raise OrderError(self.error_messages['product_invalid'])
-
         new_quotas = (variation.quotas.filter(subevent=position.subevent)
                       if variation else item.quotas.filter(subevent=position.subevent))
         if not new_quotas:
             raise OrderError(self.error_messages['quota_missing'])
 
-        if self.order.event.settings.invoice_include_free or price.gross != Decimal('0.00') or position.price != Decimal('0.00'):
-            self._invoice_dirty = True
-
-        self._totaldiff += price.gross - position.price
         self._quotadiff.update(new_quotas)
         self._quotadiff.subtract(position.quotas)
-        self._operations.append(self.ItemOperation(position, item, variation, price))
+        self._operations.append(self.ItemOperation(position, item, variation))
 
     def change_subevent(self, position: OrderPosition, subevent: SubEvent):
         price = get_price(position.item, position.variation, voucher=position.voucher, subevent=subevent,
@@ -892,19 +1005,15 @@ class OrderChangeManager:
         if not new_quotas:
             raise OrderError(self.error_messages['quota_missing'])
 
-        if self.order.event.settings.invoice_include_free or price.gross != Decimal('0.00') or position.price != Decimal('0.00'):
-            self._invoice_dirty = True
-
-        self._totaldiff += price.gross - position.price
         self._quotadiff.update(new_quotas)
         self._quotadiff.subtract(position.quotas)
-        self._operations.append(self.SubeventOperation(position, subevent, price))
+        self._operations.append(self.SubeventOperation(position, subevent))
 
     def regenerate_secret(self, position: OrderPosition):
         self._operations.append(self.RegenerateSecretOperation(position))
 
     def change_price(self, position: OrderPosition, price: Decimal):
-        price = position.item.tax(price)
+        price = position.item.tax(price, base_price_is='gross')
 
         self._totaldiff += price.gross - position.price
 
@@ -1061,14 +1170,11 @@ class OrderChangeManager:
                     'new_variation': op.variation.pk if op.variation else None,
                     'old_price': op.position.price,
                     'addon_to': op.position.addon_to_id,
-                    'new_price': op.price.gross
+                    'new_price': op.position.price
                 })
                 op.position.item = op.item
                 op.position.variation = op.variation
-                op.position.price = op.price.gross
-                op.position.tax_rate = op.price.rate
-                op.position.tax_value = op.price.tax
-                op.position.tax_rule = op.item.tax_rule
+                op.position._calculate_tax()
                 op.position.save()
             elif isinstance(op, self.SubeventOperation):
                 self.order.log_action('pretix.event.order.changed.subevent', user=self.user, auth=self.auth, data={
@@ -1077,13 +1183,9 @@ class OrderChangeManager:
                     'old_subevent': op.position.subevent.pk,
                     'new_subevent': op.subevent.pk,
                     'old_price': op.position.price,
-                    'new_price': op.price.gross
+                    'new_price': op.position.price
                 })
                 op.position.subevent = op.subevent
-                op.position.price = op.price.gross
-                op.position.tax_rate = op.price.rate
-                op.position.tax_value = op.price.tax
-                op.position.tax_rule = op.position.item.tax_rule
                 op.position.save()
             elif isinstance(op, self.PriceOperation):
                 self.order.log_action('pretix.event.order.changed.price', user=self.user, auth=self.auth, data={
@@ -1094,9 +1196,7 @@ class OrderChangeManager:
                     'new_price': op.price.gross
                 })
                 op.position.price = op.price.gross
-                op.position.tax_rate = op.price.rate
-                op.position.tax_value = op.price.tax
-                op.position.tax_rule = op.position.item.tax_rule
+                op.position._calculate_tax()
                 op.position.save()
             elif isinstance(op, self.CancelOperation):
                 for opa in op.position.addons.all():
@@ -1146,8 +1246,8 @@ class OrderChangeManager:
             elif isinstance(op, self.RegenerateSecretOperation):
                 op.position.secret = generate_position_secret()
                 op.position.save()
-                CachedTicket.objects.filter(order_position__order=self.order).delete()
-                CachedCombinedTicket.objects.filter(order=self.order).delete()
+                tickets.invalidate_cache.apply_async(kwargs={'event': self.event.pk,
+                                                             'order': self.order.pk})
                 self.order.log_action('pretix.event.order.changed.secret', user=self.user, auth=self.auth, data={
                     'position': op.position.pk,
                     'positionid': op.position.positionid,
@@ -1328,9 +1428,10 @@ class OrderChangeManager:
             email_template = order.event.settings.mail_text_order_changed
             email_context = {
                 'event': order.event.name,
-                'url': build_absolute_uri(self.order.event, 'presale:event.order', kwargs={
+                'url': build_absolute_uri(self.order.event, 'presale:event.order.open', kwargs={
                     'order': order.code,
-                    'secret': order.secret
+                    'secret': order.secret,
+                    'hash': order.email_confirm_hash()
                 }),
                 'invoice_name': invoice_name,
                 'invoice_company': invoice_company,
@@ -1377,12 +1478,14 @@ class OrderChangeManager:
             if self.split_order:
                 self._notify_user(self.split_order)
 
+        order_changed.send(self.order.event, order=self.order)
+
     def _clear_tickets_cache(self):
-        CachedTicket.objects.filter(order_position__order=self.order).delete()
-        CachedCombinedTicket.objects.filter(order=self.order).delete()
+        tickets.invalidate_cache.apply_async(kwargs={'event': self.event.pk,
+                                                     'order': self.order.pk})
         if self.split_order:
-            CachedTicket.objects.filter(order_position__order=self.split_order).delete()
-            CachedCombinedTicket.objects.filter(order=self.split_order).delete()
+            tickets.invalidate_cache.apply_async(kwargs={'event': self.event.pk,
+                                                         'order': self.split_order.pk})
 
     def _get_payment_provider(self):
         lp = self.order.payments.last()

src/pretix/base/services/quotas.py

@@ -1,11 +1,11 @@
 from datetime import timedelta
 
-from django.db import models
-from django.db.models import F, Max, OuterRef, Q, Subquery
+from django.conf import settings
+from django.db.models import Max, Q
 from django.dispatch import receiver
 from django.utils.timezone import now
 
-from pretix.base.models import LogEntry, Quota
+from pretix.base.models import Event, LogEntry
 from pretix.celery_app import app
 
 from ..signals import periodic_task
@@ -18,19 +18,25 @@ def build_all_quota_caches(sender, **kwargs):
 
 @app.task
 def refresh_quota_caches():
-    last_activity = LogEntry.objects.filter(
-        event=OuterRef('event_id'),
+    # Active events
+    active = LogEntry.objects.using(settings.DATABASE_REPLICA).filter(
+        datetime__gt=now() - timedelta(days=7)
     ).order_by().values('event').annotate(
-        m=Max('datetime')
-    ).values(
-        'm'
+        last_activity=Max('datetime')
     )
-    quotas = Quota.objects.annotate(
-        last_activity=Subquery(last_activity, output_field=models.DateTimeField())
-    ).filter(
-        Q(cached_availability_time__isnull=True) |
-        Q(cached_availability_time__lt=F('last_activity')) |
-        Q(cached_availability_time__lt=now() - timedelta(hours=2), last_activity__gt=now() - timedelta(days=7))
-    ).select_related('subevent')
-    for q in quotas:
-        q.availability()
+    for a in active:
+        try:
+            e = Event.objects.using(settings.DATABASE_REPLICA).get(pk=a['event'])
+        except Event.DoesNotExist:
+            continue
+        quotas = e.quotas.filter(
+            Q(cached_availability_time__isnull=True) |
+            Q(cached_availability_time__lt=a['last_activity']) |
+            Q(cached_availability_time__lt=now() - timedelta(hours=2))
+        ).filter(
+            Q(subevent__isnull=True) |
+            Q(subevent__date_to__isnull=False, subevent__date_to__gte=now() - timedelta(days=14)) |
+            Q(subevent__date_from__gte=now() - timedelta(days=14))
+        )
+        for q in quotas:
+            q.availability()

src/pretix/base/services/tickets.py

@@ -96,7 +96,7 @@ def preview(event: int, provider: str):
                 return prov.generate(p)
 
 
-def get_tickets_for_order(order):
+def get_tickets_for_order(order, base_position=None):
     can_download = all([r for rr, r in allow_ticket_download.send(order.event, order=order)])
     if not can_download:
         return []
@@ -111,20 +111,29 @@ def get_tickets_for_order(order):
 
     tickets = []
 
+    positions = list(order.positions_with_tickets)
+    if base_position:
+        # Only the given position and its children
+        positions = [
+            p for p in positions if p.pk == base_position.pk or p.addon_to_id == base_position.pk
+        ]
+
     for p in providers:
         if not p.is_enabled:
             continue
 
-        if p.multi_download_enabled:
+        if p.multi_download_enabled and not base_position:
             try:
-                if len(list(order.positions_with_tickets)) == 0:
+                if len(positions) == 0:
                     continue
                 ct = CachedCombinedTicket.objects.filter(
                     order=order, provider=p.identifier, file__isnull=False
                 ).last()
                 if not ct or not ct.file:
-                    retval = generate.apply(args=('order', order.pk, p.identifier))
-                    ct = CachedCombinedTicket.objects.get(pk=retval.get())
+                    retval = generate_order(order.pk, p.identifier)
+                    if not retval:
+                        continue
+                    ct = CachedCombinedTicket.objects.get(pk=retval)
                 tickets.append((
                     "{}-{}-{}{}".format(
                         order.event.slug.upper(), order.code, ct.provider, ct.extension,
@@ -134,14 +143,16 @@ def get_tickets_for_order(order):
             except:
                 logger.exception('Failed to generate ticket.')
         else:
-            for pos in order.positions_with_tickets:
+            for pos in positions:
                 try:
                     ct = CachedTicket.objects.filter(
                         order_position=pos, provider=p.identifier, file__isnull=False
                     ).last()
                     if not ct or not ct.file:
-                        retval = generate.apply(args=('orderposition', pos.pk, p.identifier))
-                        ct = CachedTicket.objects.get(pk=retval.get())
+                        retval = generate_orderposition(pos.pk, p.identifier)
+                        if not retval:
+                            continue
+                        ct = CachedTicket.objects.get(pk=retval)
                     tickets.append((
                         "{}-{}-{}-{}{}".format(
                             order.event.slug.upper(), order.code, pos.positionid, ct.provider, ct.extension,
@@ -152,3 +163,26 @@ def get_tickets_for_order(order):
                     logger.exception('Failed to generate ticket.')
 
     return tickets
+
+
+@app.task(base=ProfiledTask)
+def invalidate_cache(event: int, item: int=None, provider: str=None, order: int=None, **kwargs):
+    event = Event.objects.get(id=event)
+    qs = CachedTicket.objects.filter(order_position__order__event=event)
+    qsc = CachedCombinedTicket.objects.filter(order__event=event)
+
+    if item:
+        qs = qs.filter(order_position__item_id=item)
+
+    if provider:
+        qs = qs.filter(provider=provider)
+        qsc = qsc.filter(provider=provider)
+
+    if order:
+        qs = qs.filter(order_position__order_id=order)
+        qsc = qsc.filter(order_id=order)
+
+    for ct in qs:
+        ct.delete()
+    for ct in qsc:
+        ct.delete()

src/pretix/base/settings.py

@@ -49,6 +49,10 @@ DEFAULTS = {
         'default': 'True',
         'type': bool,
     },
+    'invoice_address_not_asked_free': {
+        'default': 'False',
+        'type': bool,
+    },
     'invoice_name_required': {
         'default': 'False',
         'type': bool,
@@ -101,6 +105,10 @@ DEFAULTS = {
         'default': 'False',
         'type': bool
     },
+    'presale_has_ended_text': {
+        'default': '',
+        'type': LazyI18nString
+    },
     'payment_explanation': {
         'default': '',
         'type': LazyI18nString
@@ -137,6 +145,10 @@ DEFAULTS = {
         'default': 'False',
         'type': str
     },
+    'invoice_generate_sales_channels': {
+        'default': json.dumps(['web']),
+        'type': list
+    },
     'invoice_address_from': {
         'default': '',
         'type': str
@@ -289,6 +301,10 @@ DEFAULTS = {
         'default': settings.MAIL_FROM,
         'type': str
     },
+    'mail_from_name': {
+        'default': None,
+        'type': str
+    },
     'mail_text_signature': {
         'type': LazyI18nString,
         'default': ""
@@ -315,6 +331,18 @@ The list is as follows:
 
 {orders}
 
+Best regards,
+Your {event} team"""))
+    },
+    'mail_text_order_free_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(ugettext_noop("""Hello {attendee_name},
+
+you have been registered for {event} successfully.
+
+You can view the details and status of your ticket here:
+{url}
+
 Best regards,
 Your {event} team"""))
     },
@@ -331,6 +359,10 @@ You can change your order details and view the status of your order at
 Best regards,
 Your {event} team"""))
     },
+    'mail_send_order_free_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
     'mail_text_order_placed_require_approval': {
         'type': LazyI18nString,
         'default': LazyI18nString.from_gettext(ugettext_noop("""Hello,
@@ -357,6 +389,22 @@ of {total_with_currency}. Please complete your payment before {date}.
 You can change your order details and view the status of your order at
 {url}
 
+Best regards,
+Your {event} team"""))
+    },
+    'mail_send_order_placed_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
+    'mail_text_order_placed_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(ugettext_noop("""Hello {attendee_name},
+
+a ticket for {event} has been ordered for you.
+
+You can view the details and status of your ticket here:
+{url}
+
 Best regards,
 Your {event} team"""))
     },
@@ -383,6 +431,22 @@ we successfully received your payment for {event}. Thank you!
 You can change your order details and view the status of your order at
 {url}
 
+Best regards,
+Your {event} team"""))
+    },
+    'mail_send_order_paid_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
+    'mail_text_order_paid_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(ugettext_noop("""Hello {attendee_name},
+
+a ticket for {event} that has been ordered for you is now paid.
+
+You can view the details and status of your ticket here:
+{url}
+
 Best regards,
 Your {event} team"""))
     },
@@ -484,6 +548,22 @@ Your {event} team"""))
         'type': int,
         'default': None
     },
+    'mail_send_download_reminder_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
+    'mail_text_download_reminder_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(ugettext_noop("""Hello {attendee_name},
+
+you are registered for {event}.
+
+If you did not do so already, you can download your ticket here:
+{url}
+
+Best regards,
+Your {event} team"""))
+    },
     'mail_text_download_reminder': {
         'type': LazyI18nString,
         'default': LazyI18nString.from_gettext(ugettext_noop("""Hello,

src/pretix/base/signals.py

@@ -240,6 +240,19 @@ subclass of pretix.base.exporter.BaseExporter
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """
 
+validate_order = EventPluginSignal(
+    providing_args=["payment_provider", "positions", "email", "locale", "invoice_address",
+                    "meta_info"]
+)
+"""
+This signal is sent out when the user tries to confirm the order, before we actually create
+the order. It allows you to inspect the cart positions. Your return value will be ignored,
+but you can raise an OrderError with an appropriate exception message if you like to block
+the order. We strongly discourage making changes to the order here.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
 validate_cart = EventPluginSignal(
     providing_args=["positions"]
 )
@@ -275,6 +288,66 @@ because an already-paid order has been split.
 As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
 """
 
+order_canceled = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order is canceled. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
+order_expired = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order is marked as expired. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
+order_modified = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order's information is modified. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
+order_changed = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order's content is changed. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
+order_approved = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order is being approved. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
+order_denied = EventPluginSignal(
+    providing_args=["order"]
+)
+"""
+This signal is sent out every time an order is being denied. The order object is given
+as the first argument.
+
+As with all event-plugin signals, the ``sender`` keyword argument will contain the event.
+"""
+
 logentry_display = EventPluginSignal(
     providing_args=["logentry"]
 )
@@ -442,3 +515,12 @@ dictionaries as values that contain keys like in the following example::
 The evaluate member will be called with the order position, order and event as arguments. The event might
 also be a subevent, if applicable.
 """
+
+
+timeline_events = EventPluginSignal()
+"""
+This signal is sent out to collect events for the time line shown on event dashboards. You are passed
+a ``subevent`` argument which might be none and you are expected to return a list of instances of
+``pretix.base.timeline.TimelineEvent``, which is a ``namedtuple`` with the fields ``event``, ``subevent``,
+``datetime``, ``description`` and ``edit_url``.
+"""

src/pretix/base/templates/400.html

@@ -1,6 +1,6 @@
 {% extends "error.html" %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Bad Request" %}{% endblock %}
 {% block content %}
     <i class="fa fa-frown-o fa-fw big-icon"></i>

src/pretix/base/templates/403.html

@@ -1,6 +1,6 @@
 {% extends "error.html" %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Permission denied" %}{% endblock %}
 {% block content %}
     <i class="fa fa-fw fa-lock big-icon"></i>

src/pretix/base/templates/404.html

@@ -1,6 +1,6 @@
 {% extends "error.html" %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Not found" %}{% endblock %}
 {% block content %}
     <i class="fa fa-meh-o fa-fw big-icon"></i>

src/pretix/base/templates/500.html

@@ -1,6 +1,6 @@
 {% extends "error.html" %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Internal Server Error" %}{% endblock %}
 {% block content %}
     <i class="fa fa-bolt big-icon fa-fw"></i>

src/pretix/base/templates/csrffail.html

@@ -1,6 +1,6 @@
 {% extends "error.html" %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Verification failed" %}{% endblock %}
 {% block content %}
     <i class="fa fa-frown-o big-icon fa-fw"></i>

src/pretix/base/templates/debug_toolbar/base.html

@@ -1,66 +0,0 @@
-{% load i18n %}{% load static from staticfiles %}
-<link rel="stylesheet" href="{% static 'debug_toolbar/css/print.css' %}" type="text/css" media="print" />
-<link rel="stylesheet" href="{% static 'debug_toolbar/css/toolbar.css' %}" type="text/css" />
-
-<!-- Prevent our copy of jQuery from registering as an AMD module on sites that use RequireJS. -->
-    <script src="{% static 'debug_toolbar/js/jquery_pre.js' %}"></script>
-    <script type="text/javascript" src="{% static "jquery/js/jquery-2.1.1.min.js" %}"></script>
-    <script src="{% static 'debug_toolbar/js/jquery_post.js' %}"></script>
-
-<script src="{% static 'debug_toolbar/js/toolbar.js' %}"></script>
-<div id="djDebug" class="djdt-hidden" dir="ltr"
-     data-store-id="{{ toolbar.store_id }}" data-render-panel-url="{% url 'djdt:render_panel' %}"
-     {{ toolbar.config.ROOT_TAG_EXTRA_ATTRS|safe }}>
-	<div class="djdt-hidden" id="djDebugToolbar">
-		<ul id="djDebugPanelList">
-			{% if toolbar.panels %}
-			<li><a id="djHideToolBarButton" href="#" title="{% trans "Hide toolbar" %}">{% trans "Hide" %} &#187;</a></li>
-			{% else %}
-			<li id="djDebugButton">DEBUG</li>
-			{% endif %}
-			{% for panel in toolbar.panels %}
-				<li class="djDebugPanelButton">
-					<input type="checkbox" data-cookie="djdt{{ panel.panel_id }}" {% if panel.enabled %}checked="checked" title="{% trans "Disable for next and successive requests" %}"{% else %}title="{% trans "Enable for next and successive requests" %}"{% endif %} />
-					{% if panel.has_content and panel.enabled %}
-						<a href="#" title="{{ panel.title }}" class="{{ panel.panel_id }}">
-					{% else %}
-						<div class="djdt-contentless{% if not panel.enabled %} djdt-disabled{% endif %}">
-					{% endif %}
-					{{ panel.nav_title }}
-					{% if panel.enabled %}
-					{% with panel.nav_subtitle as subtitle %}
-						{% if subtitle %}<br /><small>{{ subtitle }}</small>{% endif %}
-					{% endwith %}
-					{% endif %}
-					{% if panel.has_content and panel.enabled %}
-						</a>
-					{% else %}
-						</div>
-					{% endif %}
-				</li>
-			{% endfor %}
-		</ul>
-	</div>
-	<div class="djdt-hidden" id="djDebugToolbarHandle">
-		<span title="{% trans "Show toolbar" %}" id="djShowToolBarButton">&#171;</span>
-	</div>
-	{% for panel in toolbar.panels %}
-		{% if panel.has_content and panel.enabled %}
-			<div id="{{ panel.panel_id }}" class="djdt-panelContent">
-				<div class="djDebugPanelTitle">
-					<a href="" class="djDebugClose"></a>
-					<h3>{{ panel.title|safe }}</h3>
-				</div>
-				<div class="djDebugPanelContent">
-					{% if toolbar.store_id %}
-					<img src="{% static 'debug_toolbar/img/ajax-loader.gif' %}" alt="loading" class="djdt-loader" />
-					<div class="djdt-scroll"></div>
-					{% else %}
-					<div class="djdt-scroll">{{ panel.content }}</div>
-					{% endif %}
-				</div>
-			</div>
-		{% endif %}
-	{% endfor %}
-	<div id="djDebugWindow" class="djdt-panelContent"></div>
-</div>

src/pretix/base/templates/error.html

@@ -1,6 +1,6 @@
 {% load compress %}
 {% load i18n %}
-{% load staticfiles %}
+{% load static %}
 <!DOCTYPE html>
 <html>
 <head>

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

@@ -23,13 +23,23 @@
                     <table cellpadding="20"><tr><td>
                 <![endif]-->
                 <div class="content">
-                    {% trans "You are receiving this email because you placed an order for the following event:" %}<br>
-                    <strong>{% trans "Event:" %}</strong> {{ event.name }}<br>
-                    <strong>{% trans "Order code:" %}</strong> {{ order.code }}<br>
-                    <strong>{% trans "Order date:" %}</strong> {{ order.datetime|date:"SHORT_DATE_FORMAT" }}<br>
-                    <a href="{% abseventurl event "presale:event.order" order=order.code secret=order.secret %}">
-                        {% trans "View order details" %}
-                    </a>
+                    {% if position %}
+                        {% trans "You are receiving this email because someone signed you up for the following event:" %}<br>
+                        <strong>{% trans "Event:" %}</strong> {{ event.name }}<br>
+                        <strong>{% trans "Order code:" %}</strong> {{ order.code }}<br>
+                        <strong>{% trans "Order date:" %}</strong> {{ order.datetime|date:"SHORT_DATE_FORMAT" }}<br>
+                        <a href="{% abseventurl event "presale:event.order.position" order=order.code secret=position.web_secret position=position.positionid %}">
+                            {% trans "View registration details" %}
+                        </a>
+                    {% else %}
+                        {% trans "You are receiving this email because you placed an order for the following event:" %}<br>
+                        <strong>{% trans "Event:" %}</strong> {{ event.name }}<br>
+                        <strong>{% trans "Order code:" %}</strong> {{ order.code }}<br>
+                        <strong>{% trans "Order date:" %}</strong> {{ order.datetime|date:"SHORT_DATE_FORMAT" }}<br>
+                        <a href="{% abseventurl event "presale:event.order.open" hash=order.email_confirm_hash order=order.code secret=order.secret %}">
+                            {% trans "View order details" %}
+                        </a>
+                    {% endif %}
                 </div>
                 <!--[if gte mso 9]>
                     </td></tr></table>

src/pretix/base/templates/pretixbase/forms/widgets/thumbnailed_file_input.html

@@ -0,0 +1,6 @@
+{% load thumb %}
+{% if widget.is_initial %}{{ widget.initial_text }}: <a href="{{ widget.value.url }}">{{ widget.value }}</a>{% if not widget.required %}
+    <input type="checkbox" name="{{ widget.checkbox_name }}" id="{{ widget.checkbox_id }}">
+    <label for="{{ widget.checkbox_id }}">{{ widget.clear_checkbox_label }}</label>{% endif %}{% if widget.value.is_img %}<br><a href="{{ widget.value.url }}" data-lightbox="{{ widget.value.name }}"><img src="{{ widget.value|thumb:"200x100" }}" /></a>{% endif %}<br>
+    {{ widget.input_text }}:{% endif %}
+<input type="{{ widget.type }}" name="{{ widget.name }}"{% include "django/forms/widgets/attrs.html" %}>

src/pretix/base/templatetags/money.py

@@ -17,6 +17,7 @@ def money_filter(value: Decimal, arg='', hide_currency=False):
         raise TypeError("Invalid data type passed to money filter: %r" % type(value))
     if not arg:
         raise ValueError("No currency passed.")
+    arg = arg.upper()
 
     places = settings.CURRENCY_PLACES.get(arg, 2)
     rounded = value.quantize(Decimal('1') / 10 ** places, ROUND_HALF_UP)

src/pretix/base/templatetags/rich_text.py

@@ -47,7 +47,7 @@ ALLOWED_TAGS = [
 ]
 
 ALLOWED_ATTRIBUTES = {
-    'a': ['href', 'title'],
+    'a': ['href', 'title', 'class'],
     'abbr': ['title'],
     'acronym': ['title'],
     'table': ['width'],
@@ -72,9 +72,11 @@ def safelink_callback(attrs, new=False):
 
 
 def abslink_callback(attrs, new=False):
-    attrs[None, 'href'] = urllib.parse.urljoin(settings.SITE_URL, attrs.get((None, 'href'), '/'))
-    attrs[None, 'target'] = '_blank'
-    attrs[None, 'rel'] = 'noopener'
+    url = attrs.get((None, 'href'), '/')
+    if not url.startswith('mailto:') and not url.startswith('tel:'):
+        attrs[None, 'href'] = urllib.parse.urljoin(settings.SITE_URL, url)
+        attrs[None, 'target'] = '_blank'
+        attrs[None, 'rel'] = 'noopener'
     return attrs
 
 
@@ -90,7 +92,7 @@ def markdown_compile_email(source):
         tags=ALLOWED_TAGS,
         attributes=ALLOWED_ATTRIBUTES,
         protocols=ALLOWED_PROTOCOLS,
-    ))
+    ), parse_email=True)
 
 
 def markdown_compile(source):
@@ -116,6 +118,7 @@ def rich_text(text: str, **kwargs):
     text = str(text)
     body_md = bleach.linkify(
         markdown_compile(text),
-        callbacks=DEFAULT_CALLBACKS + ([safelink_callback] if kwargs.get('safelinks', True) else [abslink_callback])
+        callbacks=DEFAULT_CALLBACKS + ([safelink_callback] if kwargs.get('safelinks', True) else [abslink_callback]),
+        parse_email=True
     )
     return mark_safe(body_md)

src/pretix/base/timeline.py

@@ -0,0 +1,200 @@
+from collections import namedtuple
+from datetime import datetime, time, timedelta
+
+from django.db.models import Q
+from django.urls import reverse
+from django.utils.timezone import make_aware
+from django.utils.translation import pgettext_lazy
+
+from pretix.base.reldate import RelativeDateWrapper
+from pretix.base.signals import timeline_events
+
+TimelineEvent = namedtuple('TimelineEvent', ('event', 'subevent', 'datetime', 'description', 'edit_url'))
+
+
+def timeline_for_event(event, subevent=None):
+    tl = []
+    ev = subevent or event
+    if subevent:
+        ev_edit_url = reverse(
+            'control:event.subevent', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug,
+                'subevent': subevent.pk
+            }
+        )
+    else:
+        ev_edit_url = reverse(
+            'control:event.settings', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug
+            }
+        )
+
+    tl.append(TimelineEvent(
+        event=event, subevent=subevent,
+        datetime=ev.date_from,
+        description=pgettext_lazy('timeline', 'Your event starts'),
+        edit_url=ev_edit_url
+    ))
+
+    if ev.date_to:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=ev.date_to,
+            description=pgettext_lazy('timeline', 'Your event ends'),
+            edit_url=ev_edit_url
+        ))
+
+    if ev.date_admission:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=ev.date_admission,
+            description=pgettext_lazy('timeline', 'Admissions for your event start'),
+            edit_url=ev_edit_url
+        ))
+
+    if ev.presale_start:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=ev.presale_start,
+            description=pgettext_lazy('timeline', 'Start of ticket sales'),
+            edit_url=ev_edit_url
+        ))
+
+    if ev.presale_end:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=ev.presale_end,
+            description=pgettext_lazy('timeline', 'End of ticket sales'),
+            edit_url=ev_edit_url
+        ))
+
+    rd = event.settings.get('last_order_modification_date', as_type=RelativeDateWrapper)
+    if rd:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=rd.datetime(ev),
+            description=pgettext_lazy('timeline', 'Customers can no longer modify their orders'),
+            edit_url=ev_edit_url
+        ))
+
+    rd = event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+    if rd:
+        d = make_aware(datetime.combine(
+            rd.date(ev),
+            time(hour=23, minute=59, second=59)
+        ), event.timezone)
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=d,
+            description=pgettext_lazy('timeline', 'No more payments can be completed'),
+            edit_url=reverse('control:event.settings.payment', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug
+            })
+        ))
+
+    rd = event.settings.get('ticket_download_date', as_type=RelativeDateWrapper)
+    if rd and event.settings.ticket_download:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=rd.datetime(ev),
+            description=pgettext_lazy('timeline', 'Tickets can be downloaded'),
+            edit_url=reverse('control:event.settings.tickets', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug
+            })
+        ))
+
+    rd = event.settings.get('cancel_allow_user_until', as_type=RelativeDateWrapper)
+    if rd and event.settings.cancel_allow_user:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=rd.datetime(ev),
+            description=pgettext_lazy('timeline', 'Customers can no longer cancel free or unpaid orders'),
+            edit_url=reverse('control:event.settings.tickets', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug
+            })
+        ))
+
+    rd = event.settings.get('cancel_allow_user_paid_until', as_type=RelativeDateWrapper)
+    if rd and event.settings.cancel_allow_user_paid:
+        tl.append(TimelineEvent(
+            event=event, subevent=subevent,
+            datetime=rd.datetime(ev),
+            description=pgettext_lazy('timeline', 'Customers can no longer cancel paid orders'),
+            edit_url=reverse('control:event.settings.tickets', kwargs={
+                'event': event.slug,
+                'organizer': event.organizer.slug
+            })
+        ))
+
+    if not event.has_subevents:
+        days = event.settings.get('mail_days_download_reminder', as_type=int)
+        if days is not None:
+            reminder_date = (ev.date_from - timedelta(days=days)).replace(hour=0, minute=0, second=0, microsecond=0)
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=reminder_date,
+                description=pgettext_lazy('timeline', 'Download reminders are being sent out'),
+                edit_url=reverse('control:event.settings.mail', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug
+                })
+            ))
+
+    for p in event.items.filter(Q(available_from__isnull=False) | Q(available_until__isnull=False)):
+        if p.available_from:
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=p.available_from,
+                description=pgettext_lazy('timeline', 'Product "{name}" becomes available').format(name=str(p)),
+                edit_url=reverse('control:event.item', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug,
+                    'item': p.pk,
+                })
+            ))
+        if p.available_until:
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=p.available_until,
+                description=pgettext_lazy('timeline', 'Product "{name}" becomes unavailable').format(name=str(p)),
+                edit_url=reverse('control:event.item', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug,
+                    'item': p.pk,
+                })
+            ))
+
+    pprovs = event.get_payment_providers()
+    # This is a special case, depending on payment providers not overriding BasePaymentProvider by too much, but it's
+    # preferrable to having all plugins implement this spearately.
+    for pprov in pprovs.values():
+        if not pprov.settings.get('_enabled', as_type=bool):
+            continue
+        availability_date = pprov.settings.get('_availability_date', as_type=RelativeDateWrapper)
+        if availability_date:
+            d = make_aware(datetime.combine(
+                availability_date.date(ev),
+                time(hour=23, minute=59, second=59)
+            ), event.timezone)
+            tl.append(TimelineEvent(
+                event=event, subevent=subevent,
+                datetime=d,
+                description=pgettext_lazy('timeline', 'Payment provider "{name}" can no longer be selected').format(
+                    name=str(pprov.verbose_name)
+                ),
+                edit_url=reverse('control:event.settings.payment.provider', kwargs={
+                    'event': event.slug,
+                    'organizer': event.organizer.slug,
+                    'provider': pprov.identifier,
+                })
+            ))
+
+    for recv, resp in timeline_events.send(sender=event, subevent=subevent):
+        tl += resp
+
+    return sorted(tl, key=lambda e: e.datetime)

src/pretix/base/views/errors.py

@@ -56,7 +56,9 @@ def page_not_found(request, exception):
     }
     template = get_template('404.html')
     body = template.render(context, request)
-    return HttpResponseNotFound(body)
+    r = HttpResponseNotFound(body)
+    r.xframe_options_exempt = True
+    return r
 
 
 @requires_csrf_token
@@ -65,7 +67,9 @@ def server_error(request):
         template = loader.get_template('500.html')
     except TemplateDoesNotExist:
         return HttpResponseServerError('<h1>Server Error (500)</h1>', content_type='text/html')
-    return HttpResponseServerError(template.render({
+    r = HttpResponseServerError(template.render({
         'request': request,
         'sentry_event_id': last_event_id(),
     }))
+    r.xframe_options_exempt = True
+    return r