diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
new file mode 100644
index 0000000000..9720a3bab0
--- /dev/null
+++ b/synapse/rest/admin/users.py
@@ -0,0 +1,100 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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 re
+
+from twisted.internet import defer
+
+from synapse.api.errors import SynapseError
+from synapse.http.servlet import (
+ RestServlet,
+ assert_params_in_dict,
+ parse_json_object_from_request,
+)
+from synapse.rest.admin import assert_requester_is_admin, assert_user_is_admin
+from synapse.types import UserID
+
+
+class UserAdminServlet(RestServlet):
+ """
+ Get or set whether or not a user is a server administrator.
+
+ Note that only local users can be server administrators, and that an
+ administrator may not demote themselves.
+
+ Only server administrators can use this API.
+
+ Examples:
+ * Get
+ GET /_synapse/admin/v1/users/@nonadmin:example.com/admin
+ response on success:
+ {
+ "admin": false
+ }
+ * Set
+ PUT /_synapse/admin/v1/users/@reivilibre:librepush.net/admin
+ request body:
+ {
+ "admin": true
+ }
+ response on success:
+ {}
+ """
+
+ PATTERNS = (re.compile("^/_synapse/admin/v1/users/(?P<user_id>@[^/]*)/admin$"),)
+
+ def __init__(self, hs):
+ self.hs = hs
+ self.auth = hs.get_auth()
+ self.handlers = hs.get_handlers()
+
+ @defer.inlineCallbacks
+ def on_GET(self, request, user_id):
+ yield assert_requester_is_admin(self.auth, request)
+
+ target_user = UserID.from_string(user_id)
+
+ if not self.hs.is_mine(target_user):
+ raise SynapseError(400, "Only local users can be admins of this homeserver")
+
+ is_admin = yield self.handlers.admin_handler.get_user_server_admin(target_user)
+ is_admin = bool(is_admin)
+
+ return 200, {"admin": is_admin}
+
+ @defer.inlineCallbacks
+ def on_PUT(self, request, user_id):
+ requester = yield self.auth.get_user_by_req(request)
+ yield assert_user_is_admin(self.auth, requester.user)
+ auth_user = requester.user
+
+ target_user = UserID.from_string(user_id)
+
+ body = parse_json_object_from_request(request)
+
+ assert_params_in_dict(body, ["admin"])
+
+ if not self.hs.is_mine(target_user):
+ raise SynapseError(400, "Only local users can be admins of this homeserver")
+
+ set_admin_to = bool(body["admin"])
+
+ if target_user == auth_user and not set_admin_to:
+ raise SynapseError(400, "You may not demote yourself.")
+
+ yield self.handlers.admin_handler.set_user_server_admin(
+ target_user, set_admin_to
+ )
+
+ return 200, {}
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