See #170: limit the amount of channels allowed per user

api/funkwhale_api/audio/dynamic_preferences_registry.py

@@ -14,3 +14,12 @@ class ChannelsEnabled(types.BooleanPreference):
         "If disabled, the channels feature will be completely switched off, "
         "and users won't be able to create channels or subscribe to them."
     )
+
+
+@global_preferences_registry.register
+class MaxChannels(types.IntegerPreference):
+    show_in_api = True
+    section = audio
+    default = 20
+    name = "max_channels"
+    verbose_name = "Max channels allowed per user"

api/funkwhale_api/audio/serializers.py

@@ -5,6 +5,7 @@ from rest_framework import serializers
 from funkwhale_api.common import serializers as common_serializers
 from funkwhale_api.common import utils as common_utils
 from funkwhale_api.common import locales
+from funkwhale_api.common import preferences
 from funkwhale_api.federation import serializers as federation_serializers
 from funkwhale_api.federation import utils as federation_utils
 from funkwhale_api.music import models as music_models
@@ -59,6 +60,11 @@ class ChannelCreateSerializer(serializers.Serializer):
     metadata = serializers.DictField(required=False)
 
     def validate(self, validated_data):
+        existing_channels = self.context["actor"].owned_channels.count()
+        if existing_channels >= preferences.get("audio__max_channels"):
+            raise serializers.ValidationError(
+                "You have reached the maximum amount of allowed channels"
+            )
         validated_data = super().validate(validated_data)
         metadata = validated_data.pop("metadata", {})
         if validated_data["content_category"] == "podcast":

api/funkwhale_api/audio/views.py

@@ -138,6 +138,8 @@ class ChannelViewSet(
             "update",
             "partial_update",
         ]
+        if self.request.user.is_authenticated:
+            context["actor"] = self.request.user.actor
         return context