1 files changed, 76 insertions, 0 deletions
diff --git a/synapse/rest/client/mutual_rooms.py b/synapse/rest/client/mutual_rooms.py
new file mode 100644
index 0000000000..d3872a76c8
--- /dev/null
+++ b/synapse/rest/client/mutual_rooms.py
@@ -0,0 +1,76 @@
+# Copyright 2020 Half-Shot
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import TYPE_CHECKING, Tuple
+
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.server import HttpServer
+from synapse.http.servlet import RestServlet
+from synapse.http.site import SynapseRequest
+from synapse.types import JsonDict, UserID
+
+from ._base import client_patterns
+
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class UserMutualRoomsServlet(RestServlet):
+    """
+    GET /uk.half-shot.msc2666/user/mutual_rooms/{user_id} HTTP/1.1
+    """
+
+    PATTERNS = client_patterns(
+        "/uk.half-shot.msc2666/user/mutual_rooms/(?P<user_id>[^/]*)",
+        releases=(),  # This is an unstable feature
+    )
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__()
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastores().main
+        self.user_directory_active = hs.config.server.update_user_directory
+
+    async def on_GET(
+        self, request: SynapseRequest, user_id: str
+    ) -> Tuple[int, JsonDict]:
+
+        if not self.user_directory_active:
+            raise SynapseError(
+                code=400,
+                msg="The user directory is disabled on this server. Cannot determine shared rooms.",
+                errcode=Codes.FORBIDDEN,
+            )
+
+        UserID.from_string(user_id)
+
+        requester = await self.auth.get_user_by_req(request)
+        if user_id == requester.user.to_string():
+            raise SynapseError(
+                code=400,
+                msg="You cannot request a list of shared rooms with yourself",
+                errcode=Codes.FORBIDDEN,
+            )
+
+        rooms = await self.store.get_mutual_rooms_for_users(
+            requester.user.to_string(), user_id
+        )
+
+        return 200, {"joined": list(rooms)}
+
+
+def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
+    UserMutualRoomsServlet(hs).register(http_server)