1 files changed, 33 insertions, 5 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 8f32191b57..9bfd25c86e 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -19,7 +19,9 @@ from twisted.internet import defer
 
 from synapse.api.constants import Membership, JoinRules
 from synapse.api.errors import AuthError, StoreError, Codes, SynapseError
-from synapse.api.events.room import RoomMemberEvent, RoomPowerLevelsEvent
+from synapse.api.events.room import (
+    RoomMemberEvent, RoomPowerLevelsEvent, RoomRedactionEvent,
+)
 from synapse.util.logutils import log_function
 
 import logging
@@ -70,6 +72,9 @@ class Auth(object):
                 if event.type == RoomPowerLevelsEvent.TYPE:
                     yield self._check_power_levels(event)
 
+                if event.type == RoomRedactionEvent.TYPE:
+                    yield self._check_redaction(event)
+
                 defer.returnValue(True)
             else:
                 raise AuthError(500, "Unknown event: %s" % event)
@@ -170,7 +175,7 @@ class Auth(object):
                     event.room_id,
                     event.user_id,
                 )
-                _, kick_level = yield self.store.get_ops_levels(event.room_id)
+                _, kick_level, _ = yield self.store.get_ops_levels(event.room_id)
 
                 if kick_level:
                     kick_level = int(kick_level)
@@ -187,7 +192,7 @@ class Auth(object):
                 event.user_id,
             )
 
-            ban_level, _ = yield self.store.get_ops_levels(event.room_id)
+            ban_level, _, _  = yield self.store.get_ops_levels(event.room_id)
 
             if ban_level:
                 ban_level = int(ban_level)
@@ -322,6 +327,29 @@ class Auth(object):
                 )
 
     @defer.inlineCallbacks
+    def _check_redaction(self, event):
+        user_level = yield self.store.get_power_level(
+            event.room_id,
+            event.user_id,
+        )
+
+        if user_level:
+            user_level = int(user_level)
+        else:
+            user_level = 0
+
+        _, _, redact_level  = yield self.store.get_ops_levels(event.room_id)
+
+        if not redact_level:
+            redact_level = 50
+
+        if user_level < redact_level:
+            raise AuthError(
+                403,
+                "You don't have permission to redact events"
+            )
+
+    @defer.inlineCallbacks
     def _check_power_levels(self, event):
         for k, v in event.content.items():
             if k == "default":
@@ -372,11 +400,11 @@ class Auth(object):
         }
 
         removed = set(old_people.keys()) - set(new_people.keys())
-        added = set(old_people.keys()) - set(new_people.keys())
+        added = set(new_people.keys()) - set(old_people.keys())
         same = set(old_people.keys()) & set(new_people.keys())
 
         for r in removed:
-            if int(old_list.content[r]) > user_level:
+            if int(old_list[r]) > user_level:
                 raise AuthError(
                     403,
                     "You don't have permission to remove user: %s" % (r, )