Introduce RequiredAction model

Fix #343 by no longer marking as refunded automatically

src/pretix/base/models/__init__.py

@@ -1,7 +1,9 @@
 from .auth import U2FDevice, User
 from .base import CachedFile, LoggedModel, cachedfile_name
 from .checkin import Checkin
-from .event import Event, EventLock, EventPermission, EventSetting
+from .event import (
+    Event, EventLock, EventPermission, EventSetting, RequiredAction,
+)
 from .invoices import Invoice, InvoiceLine, invoice_filename
 from .items import (
     Item, ItemCategory, ItemVariation, Question, QuestionOption, Quota,

src/pretix/base/models/event.py

@@ -359,3 +359,42 @@ class EventLock(models.Model):
     event = models.CharField(max_length=36, primary_key=True)
     date = models.DateTimeField(auto_now=True)
     token = models.UUIDField(default=uuid.uuid4)
+
+
+class RequiredAction(models.Model):
+    """
+    Represents an action that is to be done by an admin. The admin will be
+    displayed a list of actions to do.
+
+    :param datatime: The timestamp of the required action
+    :type datetime: datetime
+    :param user: The user that performed the action
+    :type user: User
+    :param done: If this action has been completed or dismissed
+    :type done: bool
+    :param action_type: The type of action that has to be performed. This is
+       used to look up the renderer used to describe the action in a human-
+       readable way. This should be some namespaced value using dotted
+       notation to avoid duplicates, e.g.
+       ``"pretix.plugins.banktransfer.incoming_transfer"``.
+    :type action_type: str
+    :param data: Arbitrary data that can be used by the log action renderer
+    :type data: str
+    """
+    datetime = models.DateTimeField(auto_now_add=True, db_index=True)
+    done = models.BooleanField(default=False)
+    user = models.ForeignKey('User', null=True, blank=True, on_delete=models.PROTECT)
+    event = models.ForeignKey('Event', null=True, blank=True, on_delete=models.CASCADE)
+    action_type = models.CharField(max_length=255)
+    data = models.TextField(default='{}')
+
+    class Meta:
+        ordering = ('datetime',)
+
+    def display(self, request):
+        from ..signals import requiredaction_display
+
+        for receiver, response in requiredaction_display.send(self.event, action=self, request=request):
+            if response:
+                return response
+        return self.action_type