Add sales channels (#1103)

- [x] Data model
- [x] Enforce constraint
- [x] Filter order list
- [x] Set channel on created order
- [x] Products API
- [x] Order API
- [x] Tests
- [x] Filter reports
- [x] Resellers
- [ ] deploy plugins
  - [ ] posbackend
  - [ ] resellers
  - [ ] reports
- [x] Ticketlayouts
- [x] Support in pretixPOS

doc/api/resources/items.rst

@@ -37,6 +37,8 @@ admission                             boolean                    ``True`` for it
 position                              integer                    An integer, used for sorting
 picture                               string                     A product picture to be displayed in the shop
                                                                  (read-only).
+sales_channels                        list of strings            Sales channels this product is available on, such as
+                                                                 ``"web"`` or ``"resellers"``. Defaults to ``["web"]``.
 available_from                        datetime                   The first date time at which this item can be bought
                                                                  (or ``null``).
 available_until                       datetime                   The last date time at which this item can be bought
@@ -105,6 +107,10 @@ addons                                list of objects            Definition of a
 
    The field ``require_approval`` has been added.
 
+.. versionchanged:: 2.3
+
+   The ``sales_channels`` attribute has been added.
+
 Notes
 -----
 Please note that an item either always has variations or never has. Once created with variations the item can never
@@ -147,6 +153,7 @@ Endpoints
             "id": 1,
             "name": {"en": "Standard ticket"},
             "internal_name": "",
+            "sales_channels": ["web"],
             "default_price": "23.00",
             "original_price": null,
             "category": null,
@@ -232,6 +239,7 @@ Endpoints
         "id": 1,
         "name": {"en": "Standard ticket"},
         "internal_name": "",
+        "sales_channels": ["web"],
         "default_price": "23.00",
         "original_price": null,
         "category": null,
@@ -298,6 +306,7 @@ Endpoints
         "id": 1,
         "name": {"en": "Standard ticket"},
         "internal_name": "",
+        "sales_channels": ["web"],
         "default_price": "23.00",
         "original_price": null,
         "category": null,
@@ -351,6 +360,7 @@ Endpoints
         "id": 1,
         "name": {"en": "Standard ticket"},
         "internal_name": "",
+        "sales_channels": ["web"],
         "default_price": "23.00",
         "original_price": null,
         "category": null,
@@ -436,6 +446,7 @@ Endpoints
         "id": 1,
         "name": {"en": "Ticket"},
         "internal_name": "",
+        "sales_channels": ["web"],
         "default_price": "25.00",
         "original_price": null,
         "category": null,

doc/api/resources/orders.rst

@@ -30,6 +30,8 @@ status                                string                     Order status, o
 secret                                string                     The secret contained in the link sent to the customer
 email                                 string                     The customer email address
 locale                                string                     The locale used for communication with this customer
+sales_channel                         string                     Channel this sale was created through, such as
+                                                                 ``"web"``.
 datetime                              datetime                   Time of order creation
 expires                               datetime                   The order will expire, if it is still pending by this time
 payment_date                          date                       **DEPRECATED AND INACCURATE** Date of payment receipt
@@ -121,6 +123,10 @@ last_modified                         datetime                   Last modificati
    nested ``payments`` and ``refunds`` resources, but will still be served and removed in 2.2. The ``require_approval``
    attribute has been added, as have been the ``…/approve/`` and ``…/deny/`` endpoints.
 
+.. versionchanged:: 2.3
+
+   The ``sales_channel`` attribute has been added.
+
 .. _order-position-resource:
 
 Order position resource
@@ -265,6 +271,7 @@ List of all orders
             "secret": "k24fiuwvu8kxz3y1",
             "email": "tester@example.org",
             "locale": "en",
+            "sales_channel": "web",
             "datetime": "2017-12-01T10:00:00Z",
             "expires": "2017-12-10T10:00:00Z",
             "last_modified": "2017-12-01T10:00:00Z",
@@ -401,6 +408,7 @@ Fetching individual orders
         "secret": "k24fiuwvu8kxz3y1",
         "email": "tester@example.org",
         "locale": "en",
+        "sales_channel": "web",
         "datetime": "2017-12-01T10:00:00Z",
         "expires": "2017-12-10T10:00:00Z",
         "last_modified": "2017-12-01T10:00:00Z",
@@ -561,6 +569,8 @@ Creating orders
 
        * does not validate if products are only to be sold in a specific time frame
 
+       * does not validate if products are only to be sold on other sales channels
+
        * does not validate if the event's ticket sales are already over or haven't started
 
        * does not validate the number of items per order or the number of times an item can be included in an order
@@ -597,6 +607,7 @@ Creating orders
      creation.
    * ``email``
    * ``locale``
+   * ``sales_channel``
    * ``payment_provider`` – The identifier of the payment provider set for this order. This needs to be an existing
      payment provider. You should use ``"free"`` for free orders, and we strongly advise to use ``"manual"`` for all
      orders you create as paid.
@@ -661,6 +672,7 @@ Creating orders
       {
         "email": "dummy@example.org",
         "locale": "en",
+        "sales_channel": "web",
         "fees": [
           {
             "fee_type": "payment",