Add BaseExporter.available_for_user()

src/pretix/base/exporter.py

@@ -157,6 +157,13 @@ class BaseExporter:
         """
         raise NotImplementedError()  # NOQA
 
+    def available_for_user(self, user) -> bool:
+        """
+        Allows to do additional checks whether an exporter is available based on the user who calls it. Note that
+        ``user`` may be ``None`` e.g. during API usage.
+        """
+        return True
+
 
 class OrganizerLevelExportMixin:
     @property

src/pretix/base/services/export.py

@@ -290,6 +290,8 @@ def scheduled_organizer_export(self, organizer: Organizer, schedule: int) -> Non
     if isinstance(exporter, OrganizerLevelExportMixin):
         if not schedule.owner.has_organizer_permission(organizer, exporter.organizer_required_permission):
             has_permission = False
+    if exporter and not exporter.available_for_user(schedule.owner):
+        has_permission = False
 
     _run_scheduled_export(
         schedule,