Grant ASes the ability to create alias in their own namespace.

Add a new errcode type M_EXCLUSIVE when users try to create aliases inside
AS namespaces, and when ASes try to create aliases outside their own
namespace.

synapse/api/auth.py

@@ -380,6 +380,18 @@ class Auth(object):
             raise AuthError(403, "Unrecognised access token.",
                             errcode=Codes.UNKNOWN_TOKEN)
 
+    @defer.inlineCallbacks
+    def get_appservice_by_req(self, request):
+        try:
+            token = request.args["access_token"][0]
+            service = yield self.store.get_app_service_by_token(token)
+            if not service:
+                raise AuthError(403, "Unrecognised access token.",
+                                errcode=Codes.UNKNOWN_TOKEN)
+            defer.returnValue(service)
+        except KeyError:
+            raise AuthError(403, "Missing access token.")
+
     def is_server_admin(self, user):
         return self.store.is_server_admin(user)
 

synapse/api/errors.py

@@ -36,7 +36,8 @@ class Codes(object):
     CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
     CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
     MISSING_PARAM = "M_MISSING_PARAM",
-    TOO_LARGE = "M_TOO_LARGE"
+    TOO_LARGE = "M_TOO_LARGE",
+    EXCLUSIVE = "M_EXCLUSIVE"
 
 
 class CodeMessageException(RuntimeError):

synapse/handlers/directory.py

@@ -37,24 +37,15 @@ class DirectoryHandler(BaseHandler):
         )
 
     @defer.inlineCallbacks
-    def create_association(self, user_id, room_alias, room_id, servers=None):
-
-        # TODO(erikj): Do auth.
+    def _create_association(self, room_alias, room_id, servers=None):
+        # general association creation for both human users and app services
 
         if not self.hs.is_mine(room_alias):
             raise SynapseError(400, "Room alias must be local")
             # TODO(erikj): Change this.
 
         # TODO(erikj): Add transactions.
-
         # TODO(erikj): Check if there is a current association.
-
-        is_claimed = yield self.is_alias_exclusive_to_appservices(room_alias)
-        if is_claimed:
-            raise SynapseError(
-                400, "This alias is reserved by an application service."
-            )
-
         if not servers:
             servers = yield self.store.get_joined_hosts_for_room(room_id)
 
@@ -67,6 +58,33 @@ class DirectoryHandler(BaseHandler):
             servers
         )
 
+
+    @defer.inlineCallbacks
+    def create_association(self, user_id, room_alias, room_id, servers=None):
+        # association creation for human users
+        # TODO(erikj): Do user auth.
+
+        is_claimed = yield self.is_alias_exclusive_to_appservices(room_alias)
+        if is_claimed:
+            raise SynapseError(
+                400, "This alias is reserved by an application service.",
+                errcode=Codes.EXCLUSIVE
+            )
+        yield self._create_association(room_alias, room_id, servers)
+
+
+    @defer.inlineCallbacks
+    def create_appservice_association(self, service, room_alias, room_id,
+                                      servers=None):
+        if not service.is_interested_in_alias(room_alias.to_string()):
+            raise SynapseError(
+                400, "This application service has not reserved"
+                " this kind of alias.", errcode=Codes.EXCLUSIVE
+            )
+
+        # association creation for app services
+        yield self._create_association(room_alias, room_id, servers)
+
     @defer.inlineCallbacks
     def delete_association(self, user_id, room_alias):
         # TODO Check if server admin
@@ -77,7 +95,8 @@ class DirectoryHandler(BaseHandler):
         is_claimed = yield self.is_alias_exclusive_to_appservices(room_alias)
         if is_claimed:
             raise SynapseError(
-                400, "This alias is reserved by an application service."
+                400, "This alias is reserved by an application service.",
+                errcode=Codes.EXCLUSIVE
             )
 
         room_id = yield self.store.delete_room_alias(room_alias)

synapse/rest/client/v1/directory.py

@@ -45,8 +45,6 @@ class ClientDirectoryServer(ClientV1RestServlet):
 
     @defer.inlineCallbacks
     def on_PUT(self, request, room_alias):
-        user, client = yield self.auth.get_user_by_req(request)
-
         content = _parse_json(request)
         if not "room_id" in content:
             raise SynapseError(400, "Missing room_id key",
@@ -70,16 +68,25 @@ class ClientDirectoryServer(ClientV1RestServlet):
         dir_handler = self.handlers.directory_handler
 
         try:
-            user_id = user.to_string()
-            yield dir_handler.create_association(
-                user_id, room_alias, room_id, servers
+            # try to auth as a user
+            user, client = yield self.auth.get_user_by_req(request)
+            try:
+                user_id = user.to_string()
+                yield dir_handler.create_association(
+                    user_id, room_alias, room_id, servers
+                )
+                yield dir_handler.send_room_alias_update_event(user_id, room_id)
+            except SynapseError as e:
+                raise e
+            except:
+                logger.exception("Failed to create association")
+                raise
+        except AuthError:
+            # try to auth as an application service
+            service = yield self.auth.get_appservice_by_req(request)
+            yield dir_handler.create_appservice_association(
+                service, room_alias, room_id, servers
             )
-            yield dir_handler.send_room_alias_update_event(user_id, room_id)
-        except SynapseError as e:
-            raise e
-        except:
-            logger.exception("Failed to create association")
-            raise
 
         defer.returnValue((200, {}))