Merge stub presence servlet into real servlet.

This is because a) its no longer needed and b) the tests around it
broke.

synapse/app/generic_worker.py

@@ -121,26 +121,6 @@
 logger = logging.getLogger("synapse.app.generic_worker")
 
 
-class PresenceStatusStubServlet(RestServlet):
-    """If presence is disabled this servlet can be used to stub out setting
-    presence status.
-    """
-
-    PATTERNS = client_patterns("/presence/(?P<user_id>[^/]*)/status")
-
-    def __init__(self, hs):
-        super().__init__()
-        self.auth = hs.get_auth()
-
-    async def on_GET(self, request, user_id):
-        await self.auth.get_user_by_req(request)
-        return 200, {"presence": "offline"}
-
-    async def on_PUT(self, request, user_id):
-        await self.auth.get_user_by_req(request)
-        return 200, {}
-
-
 class KeyUploadServlet(RestServlet):
     """An implementation of the `KeyUploadServlet` that responds to read only
     requests, but otherwise proxies through to the master instance.
@@ -329,11 +309,6 @@ def _listen_http(self, listener_config: ListenerConfig):
 
                     presence.register_servlets(self, resource)
 
-                    # If presence is disabled, use the stub servlet that does
-                    # not allow sending presence
-                    if not self.config.use_presence:
-                        PresenceStatusStubServlet(self).register(resource)
-
                     groups.register_servlets(self, resource)
 
                     resources.update({CLIENT_API_PREFIX: resource})

synapse/rest/client/v1/presence.py

@@ -35,10 +35,15 @@ def __init__(self, hs):
         self.clock = hs.get_clock()
         self.auth = hs.get_auth()
 
+        self._use_presence = hs.config.server.use_presence
+
     async def on_GET(self, request, user_id):
         requester = await self.auth.get_user_by_req(request)
         user = UserID.from_string(user_id)
 
+        if not self._use_presence:
+            return 200, {"presence": "offline"}
+
         if requester.user != user:
             allowed = await self.presence_handler.is_visible(
                 observed_user=user, observer_user=requester.user
@@ -80,7 +85,7 @@ async def on_PUT(self, request, user_id):
         except Exception:
             raise SynapseError(400, "Unable to parse state")
 
-        if self.hs.config.use_presence:
+        if self._use_presence:
             await self.presence_handler.set_state(user, state)
 
         return 200, {}

tests/rest/client/v1/test_presence.py

@@ -60,12 +60,12 @@ def test_put_presence(self):
         self.assertEqual(channel.code, 200)
         self.assertEqual(self.hs.get_presence_handler().set_state.call_count, 1)
 
+    @unittest.override_config({"use_presence": False})
     def test_put_presence_disabled(self):
         """
         PUT to the status endpoint with use_presence disabled will NOT call
         set_state on the presence handler.
         """
-        self.hs.config.use_presence = False
 
         body = {"presence": "here", "status_msg": "beep boop"}
         channel = self.make_request(