diff --git a/synapse/replication/http/membership.py b/synapse/replication/http/membership.py
new file mode 100644
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+++ b/synapse/replication/http/membership.py
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+# -*- coding: utf-8 -*-
+# Copyright 2018 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.
+
+import logging
+import re
+
+from twisted.internet import defer
+
+from synapse.api.errors import SynapseError, MatrixCodeMessageException
+from synapse.http.servlet import RestServlet, parse_json_object_from_request
+from synapse.types import Requester, UserID
+from synapse.util.distributor import user_left_room, user_joined_room
+
+logger = logging.getLogger(__name__)
+
+
+@defer.inlineCallbacks
+def remote_join(client, host, port, requester, remote_room_hosts,
+ room_id, user_id, content):
+ """Ask the master to do a remote join for the given user to the given room
+
+ Args:
+ client (SimpleHttpClient)
+ host (str): host of master
+ port (int): port on master listening for HTTP replication
+ requester (Requester)
+ remote_room_hosts (list[str]): Servers to try and join via
+ room_id (str)
+ user_id (str)
+ content (dict): The event content to use for the join event
+
+ Returns:
+ Deferred
+ """
+ uri = "http://%s:%s/_synapse/replication/remote_join" % (host, port)
+
+ payload = {
+ "requester": requester.serialize(),
+ "remote_room_hosts": remote_room_hosts,
+ "room_id": room_id,
+ "user_id": user_id,
+ "content": content,
+ }
+
+ try:
+ result = yield client.post_json_get_json(uri, payload)
+ except MatrixCodeMessageException as e:
+ # We convert to SynapseError as we know that it was a SynapseError
+ # on the master process that we should send to the client. (And
+ # importantly, not stack traces everywhere)
+ raise SynapseError(e.code, e.msg, e.errcode)
+ defer.returnValue(result)
+
+
+@defer.inlineCallbacks
+def remote_reject_invite(client, host, port, requester, remote_room_hosts,
+ room_id, user_id):
+ """Ask master to reject the invite for the user and room.
+
+ Args:
+ client (SimpleHttpClient)
+ host (str): host of master
+ port (int): port on master listening for HTTP replication
+ requester (Requester)
+ remote_room_hosts (list[str]): Servers to try and reject via
+ room_id (str)
+ user_id (str)
+
+ Returns:
+ Deferred
+ """
+ uri = "http://%s:%s/_synapse/replication/remote_reject_invite" % (host, port)
+
+ payload = {
+ "requester": requester.serialize(),
+ "remote_room_hosts": remote_room_hosts,
+ "room_id": room_id,
+ "user_id": user_id,
+ }
+
+ try:
+ result = yield client.post_json_get_json(uri, payload)
+ except MatrixCodeMessageException as e:
+ # We convert to SynapseError as we know that it was a SynapseError
+ # on the master process that we should send to the client. (And
+ # importantly, not stack traces everywhere)
+ raise SynapseError(e.code, e.msg, e.errcode)
+ defer.returnValue(result)
+
+
+@defer.inlineCallbacks
+def get_or_register_3pid_guest(client, host, port, requester,
+ medium, address, inviter_user_id):
+ """Ask the master to get/create a guest account for given 3PID.
+
+ Args:
+ client (SimpleHttpClient)
+ host (str): host of master
+ port (int): port on master listening for HTTP replication
+ requester (Requester)
+ medium (str)
+ address (str)
+ inviter_user_id (str): The user ID who is trying to invite the
+ 3PID
+
+ Returns:
+ Deferred[(str, str)]: A 2-tuple of `(user_id, access_token)` of the
+ 3PID guest account.
+ """
+
+ uri = "http://%s:%s/_synapse/replication/get_or_register_3pid_guest" % (host, port)
+
+ payload = {
+ "requester": requester.serialize(),
+ "medium": medium,
+ "address": address,
+ "inviter_user_id": inviter_user_id,
+ }
+
+ try:
+ result = yield client.post_json_get_json(uri, payload)
+ except MatrixCodeMessageException as e:
+ # We convert to SynapseError as we know that it was a SynapseError
+ # on the master process that we should send to the client. (And
+ # importantly, not stack traces everywhere)
+ raise SynapseError(e.code, e.msg, e.errcode)
+ defer.returnValue(result)
+
+
+@defer.inlineCallbacks
+def notify_user_membership_change(client, host, port, user_id, room_id, change):
+ """Notify master that a user has joined or left the room
+
+ Args:
+ client (SimpleHttpClient)
+ host (str): host of master
+ port (int): port on master listening for HTTP replication.
+ user_id (str)
+ room_id (str)
+ change (str): Either "join" or "left"
+
+ Returns:
+ Deferred
+ """
+ assert change in ("joined", "left")
+
+ uri = "http://%s:%s/_synapse/replication/user_%s_room" % (host, port, change)
+
+ payload = {
+ "user_id": user_id,
+ "room_id": room_id,
+ }
+
+ try:
+ result = yield client.post_json_get_json(uri, payload)
+ except MatrixCodeMessageException as e:
+ # We convert to SynapseError as we know that it was a SynapseError
+ # on the master process that we should send to the client. (And
+ # importantly, not stack traces everywhere)
+ raise SynapseError(e.code, e.msg, e.errcode)
+ defer.returnValue(result)
+
+
+class ReplicationRemoteJoinRestServlet(RestServlet):
+ PATTERNS = [re.compile("^/_synapse/replication/remote_join$")]
+
+ def __init__(self, hs):
+ super(ReplicationRemoteJoinRestServlet, self).__init__()
+
+ self.federation_handler = hs.get_handlers().federation_handler
+ self.store = hs.get_datastore()
+ self.clock = hs.get_clock()
+
+ @defer.inlineCallbacks
+ def on_POST(self, request):
+ content = parse_json_object_from_request(request)
+
+ remote_room_hosts = content["remote_room_hosts"]
+ room_id = content["room_id"]
+ user_id = content["user_id"]
+ event_content = content["content"]
+
+ requester = Requester.deserialize(self.store, content["requester"])
+
+ if requester.user:
+ request.authenticated_entity = requester.user.to_string()
+
+ logger.info(
+ "remote_join: %s into room: %s",
+ user_id, room_id,
+ )
+
+ yield self.federation_handler.do_invite_join(
+ remote_room_hosts,
+ room_id,
+ user_id,
+ event_content,
+ )
+
+ defer.returnValue((200, {}))
+
+
+class ReplicationRemoteRejectInviteRestServlet(RestServlet):
+ PATTERNS = [re.compile("^/_synapse/replication/remote_reject_invite$")]
+
+ def __init__(self, hs):
+ super(ReplicationRemoteRejectInviteRestServlet, self).__init__()
+
+ self.federation_handler = hs.get_handlers().federation_handler
+ self.store = hs.get_datastore()
+ self.clock = hs.get_clock()
+
+ @defer.inlineCallbacks
+ def on_POST(self, request):
+ content = parse_json_object_from_request(request)
+
+ remote_room_hosts = content["remote_room_hosts"]
+ room_id = content["room_id"]
+ user_id = content["user_id"]
+
+ requester = Requester.deserialize(self.store, content["requester"])
+
+ if requester.user:
+ request.authenticated_entity = requester.user.to_string()
+
+ logger.info(
+ "remote_reject_invite: %s out of room: %s",
+ user_id, room_id,
+ )
+
+ try:
+ event = yield self.federation_handler.do_remotely_reject_invite(
+ remote_room_hosts,
+ room_id,
+ user_id,
+ )
+ ret = event.get_pdu_json()
+ except Exception as e:
+ # if we were unable to reject the exception, just mark
+ # it as rejected on our end and plough ahead.
+ #
+ # The 'except' clause is very broad, but we need to
+ # capture everything from DNS failures upwards
+ #
+ logger.warn("Failed to reject invite: %s", e)
+
+ yield self.store.locally_reject_invite(
+ user_id, room_id
+ )
+ ret = {}
+
+ defer.returnValue((200, ret))
+
+
+class ReplicationRegister3PIDGuestRestServlet(RestServlet):
+ PATTERNS = [re.compile("^/_synapse/replication/get_or_register_3pid_guest$")]
+
+ def __init__(self, hs):
+ super(ReplicationRegister3PIDGuestRestServlet, self).__init__()
+
+ self.registeration_handler = hs.get_handlers().registration_handler
+ self.store = hs.get_datastore()
+ self.clock = hs.get_clock()
+
+ @defer.inlineCallbacks
+ def on_POST(self, request):
+ content = parse_json_object_from_request(request)
+
+ medium = content["medium"]
+ address = content["address"]
+ inviter_user_id = content["inviter_user_id"]
+
+ requester = Requester.deserialize(self.store, content["requester"])
+
+ if requester.user:
+ request.authenticated_entity = requester.user.to_string()
+
+ logger.info("get_or_register_3pid_guest: %r", content)
+
+ ret = yield self.registeration_handler.get_or_register_3pid_guest(
+ medium, address, inviter_user_id,
+ )
+
+ defer.returnValue((200, ret))
+
+
+class ReplicationUserJoinedLeftRoomRestServlet(RestServlet):
+ PATTERNS = [re.compile("^/_synapse/replication/user_(?P<change>joined|left)_room$")]
+
+ def __init__(self, hs):
+ super(ReplicationUserJoinedLeftRoomRestServlet, self).__init__()
+
+ self.registeration_handler = hs.get_handlers().registration_handler
+ self.store = hs.get_datastore()
+ self.clock = hs.get_clock()
+ self.distributor = hs.get_distributor()
+
+ def on_POST(self, request, change):
+ content = parse_json_object_from_request(request)
+
+ user_id = content["user_id"]
+ room_id = content["room_id"]
+
+ logger.info("user membership change: %s in %s", user_id, room_id)
+
+ user = UserID.from_string(user_id)
+
+ if change == "joined":
+ user_joined_room(self.distributor, user, room_id)
+ elif change == "left":
+ user_left_room(self.distributor, user, room_id)
+ else:
+ raise Exception("Unrecognized change: %r", change)
+
+ return (200, {})
+
+
+def register_servlets(hs, http_server):
+ ReplicationRemoteJoinRestServlet(hs).register(http_server)
+ ReplicationRemoteRejectInviteRestServlet(hs).register(http_server)
+ ReplicationRegister3PIDGuestRestServlet(hs).register(http_server)
+ ReplicationUserJoinedLeftRoomRestServlet(hs).register(http_server)
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