diff --git a/synapse/rest/client/_base.py b/synapse/rest/client/_base.py
new file mode 100644
index 0000000000..0443f4571c
--- /dev/null
+++ b/synapse/rest/client/_base.py
@@ -0,0 +1,100 @@
+# Copyright 2014-2016 OpenMarket 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.
+
+"""This module contains base REST classes for constructing client v1 servlets.
+"""
+import logging
+import re
+from typing import Iterable, Pattern
+
+from synapse.api.errors import InteractiveAuthIncompleteError
+from synapse.api.urls import CLIENT_API_PREFIX
+from synapse.types import JsonDict
+
+logger = logging.getLogger(__name__)
+
+
+def client_patterns(
+ path_regex: str,
+ releases: Iterable[int] = (0,),
+ unstable: bool = True,
+ v1: bool = False,
+) -> Iterable[Pattern]:
+ """Creates a regex compiled client path with the correct client path
+ prefix.
+
+ Args:
+ path_regex: The regex string to match. This should NOT have a ^
+ as this will be prefixed.
+ releases: An iterable of releases to include this endpoint under.
+ unstable: If true, include this endpoint under the "unstable" prefix.
+ v1: If true, include this endpoint under the "api/v1" prefix.
+ Returns:
+ An iterable of patterns.
+ """
+ patterns = []
+
+ if unstable:
+ unstable_prefix = CLIENT_API_PREFIX + "/unstable"
+ patterns.append(re.compile("^" + unstable_prefix + path_regex))
+ if v1:
+ v1_prefix = CLIENT_API_PREFIX + "/api/v1"
+ patterns.append(re.compile("^" + v1_prefix + path_regex))
+ for release in releases:
+ new_prefix = CLIENT_API_PREFIX + "/r%d" % (release,)
+ patterns.append(re.compile("^" + new_prefix + path_regex))
+
+ return patterns
+
+
+def set_timeline_upper_limit(filter_json: JsonDict, filter_timeline_limit: int) -> None:
+ """
+ Enforces a maximum limit of a timeline query.
+
+ Params:
+ filter_json: The timeline query to modify.
+ filter_timeline_limit: The maximum limit to allow, passing -1 will
+ disable enforcing a maximum limit.
+ """
+ if filter_timeline_limit < 0:
+ return # no upper limits
+ timeline = filter_json.get("room", {}).get("timeline", {})
+ if "limit" in timeline:
+ filter_json["room"]["timeline"]["limit"] = min(
+ filter_json["room"]["timeline"]["limit"], filter_timeline_limit
+ )
+
+
+def interactive_auth_handler(orig):
+ """Wraps an on_POST method to handle InteractiveAuthIncompleteErrors
+
+ Takes a on_POST method which returns an Awaitable (errcode, body) response
+ and adds exception handling to turn a InteractiveAuthIncompleteError into
+ a 401 response.
+
+ Normal usage is:
+
+ @interactive_auth_handler
+ async def on_POST(self, request):
+ # ...
+ await self.auth_handler.check_auth
+ """
+
+ async def wrapped(*args, **kwargs):
+ try:
+ return await orig(*args, **kwargs)
+ except InteractiveAuthIncompleteError as e:
+ return 401, e.result
+
+ return wrapped
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