Server capabilities support

changelog.d/4472.feature

@@ -0,0 +1 @@
+Support exposing server capabilities in CS API (MSC1753, MSC1804)

synapse/api/constants.py

@@ -108,6 +108,11 @@ class RoomVersions(object):
     STATE_V2_TEST = "state-v2-test"
 
 
+class RoomDisposition(object):
+    STABLE = "stable",
+    UNSTABLE = "unstable"
+
+
 # the version we will give rooms which are created on this server
 DEFAULT_ROOM_VERSION = RoomVersions.V1
 
@@ -118,6 +123,7 @@ class RoomVersions(object):
     RoomVersions.V2,
     RoomVersions.V3,
     RoomVersions.STATE_V2_TEST,
+    RoomVersions.V3,
 }
 
 

synapse/rest/__init__.py

@@ -34,6 +34,7 @@
     account,
     account_data,
     auth,
+    capabilities,
     devices,
     filter,
     groups,
@@ -107,3 +108,4 @@ def register_servlets(client_resource, hs):
         user_directory.register_servlets(hs, client_resource)
         groups.register_servlets(hs, client_resource)
         room_upgrade_rest_servlet.register_servlets(hs, client_resource)
+        capabilities.register_servlets(hs, client_resource)

synapse/rest/client/v2_alpha/capabilities.py

@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector
+#
+# 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 twisted.internet import defer
+
+from synapse.api.constants import DEFAULT_ROOM_VERSION, RoomDisposition, RoomVersions
+from synapse.http.servlet import RestServlet
+
+from ._base import client_v2_patterns
+
+logger = logging.getLogger(__name__)
+
+
+class CapabilitiesRestServlet(RestServlet):
+    """End point to expose the capabilities of the server."""
+
+    PATTERNS = client_v2_patterns("/capabilities$")
+
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
+        super(CapabilitiesRestServlet, self).__init__()
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastore()
+
+    @defer.inlineCallbacks
+    def on_GET(self, request):
+        requester = yield self.auth.get_user_by_req(request, allow_guest=True)
+        user = yield self.store.get_user_by_id(requester.user.to_string())
+        change_password = bool(user["password_hash"])
+
+        response = {
+            "capabilities": {
+                "m.room_versions": {
+                    "default": DEFAULT_ROOM_VERSION,
+                    "available": {
+                        RoomVersions.V1: RoomDisposition.STABLE,
+                        RoomVersions.V2: RoomDisposition.STABLE,
+                        RoomVersions.STATE_V2_TEST: RoomDisposition.UNSTABLE,
+                        RoomVersions.V3: RoomDisposition.STABLE,
+                    },
+                },
+                "m.change_password": {"enabled": change_password},
+            }
+        }
+        defer.returnValue((200, response))
+
+
+def register_servlets(hs, http_server):
+    CapabilitiesRestServlet(hs).register(http_server)

tests/rest/client/v2_alpha/test_capabilities.py

@@ -0,0 +1,78 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector Ltd
+#
+# 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.
+
+from synapse.api.constants import DEFAULT_ROOM_VERSION, KNOWN_ROOM_VERSIONS
+from synapse.rest.client.v1 import admin, login
+from synapse.rest.client.v2_alpha import capabilities
+
+from tests import unittest
+
+
+class CapabilitiesTestCase(unittest.HomeserverTestCase):
+
+    servlets = [
+        admin.register_servlets,
+        capabilities.register_servlets,
+        login.register_servlets,
+    ]
+
+    def make_homeserver(self, reactor, clock):
+        self.url = b"/_matrix/client/r0/capabilities"
+        hs = self.setup_test_homeserver()
+        self.store = hs.get_datastore()
+        return hs
+
+    def test_check_auth_required(self):
+        request, channel = self.make_request("GET", self.url)
+        self.render(request)
+
+        self.assertEqual(channel.code, 401)
+
+    def test_get_room_version_capabilities(self):
+        self.register_user("user", "pass")
+        access_token = self.login("user", "pass")
+
+        request, channel = self.make_request("GET", self.url, access_token=access_token)
+        self.render(request)
+        capabilities = channel.json_body['capabilities']
+
+        self.assertEqual(channel.code, 200)
+        for room_version in capabilities['m.room_versions']['available'].keys():
+            self.assertTrue(room_version in KNOWN_ROOM_VERSIONS, "" + room_version)
+        self.assertEqual(
+            DEFAULT_ROOM_VERSION, capabilities['m.room_versions']['default']
+        )
+
+    def test_get_change_password_capabilities(self):
+        localpart = "user"
+        password = "pass"
+        user = self.register_user(localpart, password)
+        access_token = self.login(user, password)
+
+        request, channel = self.make_request("GET", self.url, access_token=access_token)
+        self.render(request)
+        capabilities = channel.json_body['capabilities']
+
+        self.assertEqual(channel.code, 200)
+
+        # Test case where password is handled outside of Synapse
+        self.assertTrue(capabilities['m.change_password']['enabled'])
+        self.get_success(self.store.user_set_password_hash(user, None))
+        request, channel = self.make_request("GET", self.url, access_token=access_token)
+        self.render(request)
+        capabilities = channel.json_body['capabilities']
+
+        self.assertEqual(channel.code, 200)
+        self.assertFalse(capabilities['m.change_password']['enabled'])