channel.dm_checks: add restricted_guilds checking

litecord/blueprints/channel/dm_checks.py

@@ -22,5 +22,24 @@ async def dm_pre_check(user_id: int, channel_id: int, peer_id: int):
     if blockrow is not None:
         raise ForbiddenDM()
 
-    # TODO: check mutual guilds and guild settings for
-    # each user
+    # now comes the fun part, which is guild settings.
+    mutual_guilds = await app.user_storage.get_mutual_guilds(user_id, peer_id)
+
+    # user_settings.restricted_guilds gives us the dms a user doesn't
+    # want dms from, so we use that setting from both user and peer
+
+    user_settings = await app.user_storage.get_user_settings(user_id)
+    peer_settings = await app.user_storage.get_user_settings(peer_id)
+
+    restricted_user = [int(v) for v in user_settings['restricted_guilds']]
+    restricted_peer = [int(v) for v in peer_settings['restricted_guilds']]
+
+    restricted_user = set(restricted_user)
+    restricted_peer = set(restricted_peer)
+
+    mutual_guilds -= restricted_user
+    mutual_guilds -= restricted_peer
+
+    # if after this filtering we don't have any more guilds, error
+    if not mutual_guilds:
+        raise ForbiddenDM()