Add is_available hook for plugin configs

doc/development/api/plugins.rst

@@ -79,6 +79,9 @@ human-readable error messages. We recommend using the ``django.utils.functional.
 decorator, as it might get called a lot. You can also implement ``compatibility_warnings``,
 those will be displayed but not block the plugin execution.
 
+The ``AppConfig`` class may implement a method ``is_available(event)`` that checks if a plugin
+is available for a specific event. If not, it will not be shown in the plugin list of that event.
+
 Plugin registration
 -------------------
 

src/pretix/api/serializers/event.py

@@ -95,7 +95,7 @@ class EventSerializer(I18nAwareModelSerializer):
         from pretix.base.plugins import get_all_plugins
 
         plugins_available = {
-            p.module for p in get_all_plugins()
+            p.module for p in get_all_plugins(self.instance)
             if not p.name.startswith('.') and getattr(p, 'visible', True)
         }
 

src/pretix/base/models/event.py

@@ -759,7 +759,7 @@ class Event(EventMixin, LoggedModel):
 
         plugins_active = self.get_plugins()
         plugins_available = {
-            p.module: p for p in get_all_plugins()
+            p.module: p for p in get_all_plugins(self)
             if not p.name.startswith('.') and getattr(p, 'visible', True)
         }
 

src/pretix/base/plugins.py

@@ -17,7 +17,7 @@ class PluginType(Enum):
     EXPORT = 4
 
 
-def get_all_plugins() -> List[type]:
+def get_all_plugins(event=None) -> List[type]:
     """
     Returns the PretixPluginMeta classes of all plugins found in the installed Django apps.
     """
@@ -29,6 +29,11 @@ def get_all_plugins() -> List[type]:
             meta.app = app
             if app.name in settings.PRETIX_PLUGINS_EXCLUDE:
                 continue
+
+            if hasattr(app, 'is_available') and event:
+                if not app.is_available(event):
+                    continue
+
             plugins.append(meta)
     return sorted(
         plugins,

src/pretix/control/views/event.py

@@ -188,7 +188,7 @@ class EventPlugins(EventSettingsViewMixin, EventPermissionRequiredMixin, Templat
         from pretix.base.plugins import get_all_plugins
 
         context = super().get_context_data(*args, **kwargs)
-        context['plugins'] = [p for p in get_all_plugins() if not p.name.startswith('.')
+        context['plugins'] = [p for p in get_all_plugins(self.object) if not p.name.startswith('.')
                               and getattr(p, 'visible', True)]
         context['plugins_active'] = self.object.get_plugins()
         return context
@@ -204,7 +204,7 @@ class EventPlugins(EventSettingsViewMixin, EventPermissionRequiredMixin, Templat
         self.object = self.get_object()
 
         plugins_available = {
-            p.module: p for p in get_all_plugins()
+            p.module: p for p in get_all_plugins(self.object)
             if not p.name.startswith('.') and getattr(p, 'visible', True)
         }