handle empty backups according to latest spec proposal (#4123)

fixes #4056

1 files changed, 15 insertions, 7 deletions

diff --git a/synapse/handlers/e2e_room_keys.py b/synapse/handlers/e2e_room_keys.py
index 5edb3cfe04..42b040375f 100644
--- a/synapse/handlers/e2e_room_keys.py
+++ b/synapse/handlers/e2e_room_keys.py
@@ -19,7 +19,7 @@ from six import iteritems
 
 from twisted.internet import defer
 
-from synapse.api.errors import RoomKeysVersionError, StoreError, SynapseError
+from synapse.api.errors import NotFoundError, RoomKeysVersionError, StoreError
 from synapse.util.async_helpers import Linearizer
 
 logger = logging.getLogger(__name__)
@@ -55,6 +55,8 @@ class E2eRoomKeysHandler(object):
             room_id(string): room ID to get keys for, for None to get keys for all rooms
             session_id(string): session ID to get keys for, for None to get keys for all
                 sessions
+        Raises:
+            NotFoundError: if the backup version does not exist
         Returns:
             A deferred list of dicts giving the session_data and message metadata for
             these room keys.
@@ -63,13 +65,19 @@ class E2eRoomKeysHandler(object):
         # we deliberately take the lock to get keys so that changing the version
         # works atomically
         with (yield self._upload_linearizer.queue(user_id)):
+            # make sure the backup version exists
+            try:
+                yield self.store.get_e2e_room_keys_version_info(user_id, version)
+            except StoreError as e:
+                if e.code == 404:
+                    raise NotFoundError("Unknown backup version")
+                else:
+                    raise
+
             results = yield self.store.get_e2e_room_keys(
                 user_id, version, room_id, session_id
             )
 
-            if results['rooms'] == {}:
-                raise SynapseError(404, "No room_keys found")
-
             defer.returnValue(results)
 
     @defer.inlineCallbacks
@@ -120,7 +128,7 @@ class E2eRoomKeysHandler(object):
         }
 
         Raises:
-            SynapseError: with code 404 if there are no versions defined
+            NotFoundError: if there are no versions defined
             RoomKeysVersionError: if the uploaded version is not the current version
         """
 
@@ -134,7 +142,7 @@ class E2eRoomKeysHandler(object):
                 version_info = yield self.store.get_e2e_room_keys_version_info(user_id)
             except StoreError as e:
                 if e.code == 404:
-                    raise SynapseError(404, "Version '%s' not found" % (version,))
+                    raise NotFoundError("Version '%s' not found" % (version,))
                 else:
                     raise
 
@@ -148,7 +156,7 @@ class E2eRoomKeysHandler(object):
                     raise RoomKeysVersionError(current_version=version_info['version'])
                 except StoreError as e:
                     if e.code == 404:
-                        raise SynapseError(404, "Version '%s' not found" % (version,))
+                        raise NotFoundError("Version '%s' not found" % (version,))
                     else:
                         raise