Start supporting a server blocklist

app/boxes.py

@@ -26,6 +26,7 @@ from app.actor import fetch_actor
 from app.actor import save_actor
 from app.ap_object import RemoteObject
 from app.config import BASE_URL
+from app.config import BLOCKED_SERVERS
 from app.config import ID
 from app.config import MANUALLY_APPROVES_FOLLOWERS
 from app.database import AsyncSession
@@ -1447,6 +1448,10 @@ async def save_to_inbox(
         logger.exception("Failed to fetch actor")
         return
 
+    if actor.server in BLOCKED_SERVERS:
+        logger.warning(f"Server {actor.server} is blocked")
+        return
+
     if "id" not in raw_object:
         await _process_transient_object(db_session, raw_object, actor)
         return None