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-rw-r--r--synapse/api/auth.py16
1 files changed, 15 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 65ee1452ce..f7cf17e433 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -20,7 +20,7 @@ from twisted.internet import defer
 from synapse.api.constants import EventTypes, Membership, JoinRules
 from synapse.api.errors import AuthError, Codes, SynapseError
 from synapse.util.logutils import log_function
-from synapse.types import UserID
+from synapse.types import EventID, RoomID, UserID
 
 import logging
 
@@ -65,6 +65,15 @@ class Auth(object):
                 # FIXME
                 return True
 
+            creating_domain = RoomID.from_string(event.room_id).domain
+            originating_domain = EventID.from_string(event.event_id).domain
+            if creating_domain != originating_domain:
+                if not self.can_federate(event, auth_events):
+                    raise SynapseError(
+                        403,
+                        "This room has been marked as unfederatable."
+                    )
+
             # FIXME: Temp hack
             if event.type == EventTypes.Aliases:
                 return True
@@ -153,6 +162,11 @@ class Auth(object):
                 user_id, room_id, repr(member)
             ))
 
+    def can_federate(self, event, auth_events):
+        creation_event = auth_events.get((EventTypes.Create, ""))
+
+        return creation_event.content.get("m.federate", True) is True
+
     @log_function
     def is_membership_change_allowed(self, event, auth_events):
         membership = event.content["membership"]