1 files changed, 146 insertions, 0 deletions
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
new file mode 100644
index 0000000000..9d38a7336e
--- /dev/null
+++ b/synapse/handlers/typing.py
@@ -0,0 +1,146 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 matrix.org
+#
+# 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.
+
+from twisted.internet import defer
+
+from ._base import BaseHandler
+
+import logging
+
+from collections import namedtuple
+
+
+logger = logging.getLogger(__name__)
+
+
+# A tiny object useful for storing a user's membership in a room, as a mapping
+# key
+RoomMember = namedtuple("RoomMember", ("room_id", "user"))
+
+
+class TypingNotificationHandler(BaseHandler):
+    def __init__(self, hs):
+        super(TypingNotificationHandler, self).__init__(hs)
+
+        self.homeserver = hs
+
+        self.clock = hs.get_clock()
+
+        self.federation = hs.get_replication_layer()
+
+        self.federation.register_edu_handler("m.typing", self._recv_edu)
+
+        self._member_typing_until = {}
+
+    @defer.inlineCallbacks
+    def started_typing(self, target_user, auth_user, room_id, timeout):
+        if not target_user.is_mine:
+            raise SynapseError(400, "User is not hosted on this Home Server")
+
+        if target_user != auth_user:
+            raise AuthError(400, "Cannot set another user's typing state")
+
+        until = self.clock.time_msec() + timeout
+        member = RoomMember(room_id=room_id, user=target_user)
+
+        was_present = member in self._member_typing_until
+
+        self._member_typing_until[member] = until
+
+        if was_present:
+            # No point sending another notification
+            defer.returnValue(None)
+
+        yield self._push_update(
+            room_id=room_id,
+            user=target_user,
+            typing=True,
+        )
+
+    @defer.inlineCallbacks
+    def stopped_typing(self, target_user, auth_user, room_id):
+        if not target_user.is_mine:
+            raise SynapseError(400, "User is not hosted on this Home Server")
+
+        if target_user != auth_user:
+            raise AuthError(400, "Cannot set another user's typing state")
+
+        member = RoomMember(room_id=room_id, user=target_user)
+
+        if member not in self._member_typing_until:
+            # No point
+            defer.returnValue(None)
+
+        yield self._push_update(
+            room_id=room_id,
+            user=target_user,
+            typing=False,
+        )
+
+    @defer.inlineCallbacks
+    def _push_update(self, room_id, user, typing):
+        localusers = set()
+        remotedomains = set()
+
+        rm_handler = self.homeserver.get_handlers().room_member_handler
+        yield rm_handler.fetch_room_distributions_into(room_id,
+                localusers=localusers, remotedomains=remotedomains,
+                ignore_user=user)
+
+        for u in localusers:
+            self.push_update_to_clients(
+                room_id=room_id,
+                observer_user=u,
+                observed_user=user,
+                typing=typing,
+            )
+
+        deferreds = []
+        for domain in remotedomains:
+            deferreds.append(self.federation.send_edu(
+                destination=domain,
+                edu_type="m.typing",
+                content={
+                    "room_id": room_id,
+                    "user_id": user.to_string(),
+                    "typing": typing,
+                },
+            ))
+
+        yield defer.DeferredList(deferreds, consumeErrors=False)
+
+    @defer.inlineCallbacks
+    def _recv_edu(self, origin, content):
+        room_id = content["room_id"]
+        user = self.homeserver.parse_userid(content["user_id"])
+
+        localusers = set()
+
+        rm_handler = self.homeserver.get_handlers().room_member_handler
+        yield rm_handler.fetch_room_distributions_into(room_id,
+                localusers=localusers)
+
+        for u in localusers:
+            self.push_update_to_clients(
+                room_id=room_id,
+                observer_user=u,
+                observed_user=user,
+                typing=content["typing"]
+            )
+
+    def push_update_to_clients(self, room_id, observer_user, observed_user,
+            typing):
+        # TODO(paul) steal this from presence.py
+        pass