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-rw-r--r--synapse/handlers/__init__.py5
-rw-r--r--synapse/handlers/_base.py57
-rw-r--r--synapse/handlers/auth.py3
-rw-r--r--synapse/handlers/federation.py227
-rw-r--r--synapse/handlers/message.py79
-rw-r--r--synapse/handlers/private_user_data.py46
-rw-r--r--synapse/handlers/room.py311
-rw-r--r--synapse/handlers/search.py154
-rw-r--r--synapse/handlers/sync.py352
9 files changed, 1017 insertions, 217 deletions
diff --git a/synapse/handlers/__init__.py b/synapse/handlers/__init__.py
index 8725c3c420..6a2339f2eb 100644
--- a/synapse/handlers/__init__.py
+++ b/synapse/handlers/__init__.py
@@ -17,7 +17,7 @@ from synapse.appservice.scheduler import AppServiceScheduler
 from synapse.appservice.api import ApplicationServiceApi
 from .register import RegistrationHandler
 from .room import (
-    RoomCreationHandler, RoomMemberHandler, RoomListHandler
+    RoomCreationHandler, RoomMemberHandler, RoomListHandler, RoomContextHandler,
 )
 from .message import MessageHandler
 from .events import EventStreamHandler, EventHandler
@@ -32,6 +32,7 @@ from .sync import SyncHandler
 from .auth import AuthHandler
 from .identity import IdentityHandler
 from .receipts import ReceiptsHandler
+from .search import SearchHandler
 
 
 class Handlers(object):
@@ -68,3 +69,5 @@ class Handlers(object):
         self.sync_handler = SyncHandler(hs)
         self.auth_handler = AuthHandler(hs)
         self.identity_handler = IdentityHandler(hs)
+        self.search_handler = SearchHandler(hs)
+        self.room_context_handler = RoomContextHandler(hs)
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index c488ee0f6d..6a26cb1879 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -21,6 +21,7 @@ from synapse.api.constants import Membership, EventTypes
 from synapse.types import UserID, RoomAlias
 
 from synapse.util.logcontext import PreserveLoggingContext
+from synapse.util import third_party_invites
 
 import logging
 
@@ -45,6 +46,52 @@ class BaseHandler(object):
 
         self.event_builder_factory = hs.get_event_builder_factory()
 
+    @defer.inlineCallbacks
+    def _filter_events_for_client(self, user_id, events):
+        event_id_to_state = yield self.store.get_state_for_events(
+            frozenset(e.event_id for e in events),
+            types=(
+                (EventTypes.RoomHistoryVisibility, ""),
+                (EventTypes.Member, user_id),
+            )
+        )
+
+        def allowed(event, state):
+            if event.type == EventTypes.RoomHistoryVisibility:
+                return True
+
+            membership_ev = state.get((EventTypes.Member, user_id), None)
+            if membership_ev:
+                membership = membership_ev.membership
+            else:
+                membership = Membership.LEAVE
+
+            if membership == Membership.JOIN:
+                return True
+
+            history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
+            if history:
+                visibility = history.content.get("history_visibility", "shared")
+            else:
+                visibility = "shared"
+
+            if visibility == "public":
+                return True
+            elif visibility == "shared":
+                return True
+            elif visibility == "joined":
+                return membership == Membership.JOIN
+            elif visibility == "invited":
+                return membership == Membership.INVITE
+
+            return True
+
+        defer.returnValue([
+            event
+            for event in events
+            if allowed(event, event_id_to_state[event.event_id])
+        ])
+
     def ratelimit(self, user_id):
         time_now = self.clock.time()
         allowed, time_allowed = self.ratelimiter.send_message(
@@ -123,6 +170,16 @@ class BaseHandler(object):
                         )
                     )
 
+        if (
+            event.type == EventTypes.Member and
+            event.content["membership"] == Membership.JOIN and
+            third_party_invites.join_has_third_party_invite(event.content)
+        ):
+            yield third_party_invites.check_key_valid(
+                self.hs.get_simple_http_client(),
+                event
+            )
+
         federation_handler = self.hs.get_handlers().federation_handler
 
         if event.type == EventTypes.Member:
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 484f719253..055d395b20 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -44,6 +44,7 @@ class AuthHandler(BaseHandler):
             LoginType.EMAIL_IDENTITY: self._check_email_identity,
             LoginType.DUMMY: self._check_dummy_auth,
         }
+        self.bcrypt_rounds = hs.config.bcrypt_rounds
         self.sessions = {}
 
     @defer.inlineCallbacks
@@ -432,7 +433,7 @@ class AuthHandler(BaseHandler):
         Returns:
             Hashed password (str).
         """
-        return bcrypt.hashpw(password, bcrypt.gensalt())
+        return bcrypt.hashpw(password, bcrypt.gensalt(self.bcrypt_rounds))
 
     def validate_hash(self, password, stored_hash):
         """Validates that self.hash(password) == stored_hash.
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index a710bdcfdb..ae9d227586 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -39,7 +39,7 @@ from twisted.internet import defer
 
 import itertools
 import logging
-
+from synapse.util import third_party_invites
 
 logger = logging.getLogger(__name__)
 
@@ -565,7 +565,7 @@ class FederationHandler(BaseHandler):
 
     @log_function
     @defer.inlineCallbacks
-    def do_invite_join(self, target_hosts, room_id, joinee, content, snapshot):
+    def do_invite_join(self, target_hosts, room_id, joinee, content):
         """ Attempts to join the `joinee` to the room `room_id` via the
         server `target_host`.
 
@@ -581,49 +581,19 @@ class FederationHandler(BaseHandler):
 
         yield self.store.clean_room_for_join(room_id)
 
-        origin, pdu = yield self.replication_layer.make_join(
+        origin, event = yield self._make_and_verify_event(
             target_hosts,
             room_id,
-            joinee
+            joinee,
+            "join",
+            content
         )
 
-        logger.debug("Got response to make_join: %s", pdu)
-
-        event = pdu
-
-        # We should assert some things.
-        # FIXME: Do this in a nicer way
-        assert(event.type == EventTypes.Member)
-        assert(event.user_id == joinee)
-        assert(event.state_key == joinee)
-        assert(event.room_id == room_id)
-
-        event.internal_metadata.outlier = False
-
         self.room_queues[room_id] = []
-
-        builder = self.event_builder_factory.new(
-            unfreeze(event.get_pdu_json())
-        )
-
         handled_events = set()
 
         try:
-            builder.event_id = self.event_builder_factory.create_event_id()
-            builder.origin = self.hs.hostname
-            builder.content = content
-
-            if not hasattr(event, "signatures"):
-                builder.signatures = {}
-
-            add_hashes_and_signatures(
-                builder,
-                self.hs.hostname,
-                self.hs.config.signing_key[0],
-            )
-
-            new_event = builder.build()
-
+            new_event = self._sign_event(event)
             # Try the host we successfully got a response to /make_join/
             # request first.
             try:
@@ -631,11 +601,7 @@ class FederationHandler(BaseHandler):
                 target_hosts.insert(0, origin)
             except ValueError:
                 pass
-
-            ret = yield self.replication_layer.send_join(
-                target_hosts,
-                new_event
-            )
+            ret = yield self.replication_layer.send_join(target_hosts, new_event)
 
             origin = ret["origin"]
             state = ret["state"]
@@ -697,14 +663,20 @@ class FederationHandler(BaseHandler):
 
     @defer.inlineCallbacks
     @log_function
-    def on_make_join_request(self, room_id, user_id):
+    def on_make_join_request(self, room_id, user_id, query):
         """ We've received a /make_join/ request, so we create a partial
-        join event for the room and return that. We don *not* persist or
+        join event for the room and return that. We do *not* persist or
         process it until the other server has signed it and sent it back.
         """
+        event_content = {"membership": Membership.JOIN}
+        if third_party_invites.has_join_keys(query):
+            event_content["third_party_invite"] = (
+                third_party_invites.extract_join_keys(query)
+            )
+
         builder = self.event_builder_factory.new({
             "type": EventTypes.Member,
-            "content": {"membership": Membership.JOIN},
+            "content": event_content,
             "room_id": room_id,
             "sender": user_id,
             "state_key": user_id,
@@ -716,6 +688,9 @@ class FederationHandler(BaseHandler):
 
         self.auth.check(event, auth_events=context.current_state)
 
+        if third_party_invites.join_has_third_party_invite(event.content):
+            third_party_invites.check_key_valid(self.hs.get_simple_http_client(), event)
+
         defer.returnValue(event)
 
     @defer.inlineCallbacks
@@ -850,6 +825,168 @@ class FederationHandler(BaseHandler):
         defer.returnValue(event)
 
     @defer.inlineCallbacks
+    def do_remotely_reject_invite(self, target_hosts, room_id, user_id):
+        origin, event = yield self._make_and_verify_event(
+            target_hosts,
+            room_id,
+            user_id,
+            "leave",
+            {}
+        )
+        signed_event = self._sign_event(event)
+
+        # Try the host we successfully got a response to /make_join/
+        # request first.
+        try:
+            target_hosts.remove(origin)
+            target_hosts.insert(0, origin)
+        except ValueError:
+            pass
+
+        yield self.replication_layer.send_leave(
+            target_hosts,
+            signed_event
+        )
+        defer.returnValue(None)
+
+    @defer.inlineCallbacks
+    def _make_and_verify_event(self, target_hosts, room_id, user_id, membership, content):
+        origin, pdu = yield self.replication_layer.make_membership_event(
+            target_hosts,
+            room_id,
+            user_id,
+            membership,
+            content
+        )
+
+        logger.debug("Got response to make_%s: %s", membership, pdu)
+
+        event = pdu
+
+        # We should assert some things.
+        # FIXME: Do this in a nicer way
+        assert(event.type == EventTypes.Member)
+        assert(event.user_id == user_id)
+        assert(event.state_key == user_id)
+        assert(event.room_id == room_id)
+        defer.returnValue((origin, event))
+
+    def _sign_event(self, event):
+        event.internal_metadata.outlier = False
+
+        builder = self.event_builder_factory.new(
+            unfreeze(event.get_pdu_json())
+        )
+
+        builder.event_id = self.event_builder_factory.create_event_id()
+        builder.origin = self.hs.hostname
+
+        if not hasattr(event, "signatures"):
+            builder.signatures = {}
+
+        add_hashes_and_signatures(
+            builder,
+            self.hs.hostname,
+            self.hs.config.signing_key[0],
+        )
+
+        return builder.build()
+
+    @defer.inlineCallbacks
+    @log_function
+    def on_make_leave_request(self, room_id, user_id):
+        """ We've received a /make_leave/ request, so we create a partial
+        join event for the room and return that. We do *not* persist or
+        process it until the other server has signed it and sent it back.
+        """
+        builder = self.event_builder_factory.new({
+            "type": EventTypes.Member,
+            "content": {"membership": Membership.LEAVE},
+            "room_id": room_id,
+            "sender": user_id,
+            "state_key": user_id,
+        })
+
+        event, context = yield self._create_new_client_event(
+            builder=builder,
+        )
+
+        self.auth.check(event, auth_events=context.current_state)
+
+        defer.returnValue(event)
+
+    @defer.inlineCallbacks
+    @log_function
+    def on_send_leave_request(self, origin, pdu):
+        """ We have received a leave event for a room. Fully process it."""
+        event = pdu
+
+        logger.debug(
+            "on_send_leave_request: Got event: %s, signatures: %s",
+            event.event_id,
+            event.signatures,
+        )
+
+        event.internal_metadata.outlier = False
+
+        context, event_stream_id, max_stream_id = yield self._handle_new_event(
+            origin, event
+        )
+
+        logger.debug(
+            "on_send_leave_request: After _handle_new_event: %s, sigs: %s",
+            event.event_id,
+            event.signatures,
+        )
+
+        extra_users = []
+        if event.type == EventTypes.Member:
+            target_user_id = event.state_key
+            target_user = UserID.from_string(target_user_id)
+            extra_users.append(target_user)
+
+        with PreserveLoggingContext():
+            d = self.notifier.on_new_room_event(
+                event, event_stream_id, max_stream_id, extra_users=extra_users
+            )
+
+        def log_failure(f):
+            logger.warn(
+                "Failed to notify about %s: %s",
+                event.event_id, f.value
+            )
+
+        d.addErrback(log_failure)
+
+        new_pdu = event
+
+        destinations = set()
+
+        for k, s in context.current_state.items():
+            try:
+                if k[0] == EventTypes.Member:
+                    if s.content["membership"] == Membership.LEAVE:
+                        destinations.add(
+                            UserID.from_string(s.state_key).domain
+                        )
+            except:
+                logger.warn(
+                    "Failed to get destination from event %s", s.event_id
+                )
+
+        destinations.discard(origin)
+
+        logger.debug(
+            "on_send_leave_request: Sending event: %s, signatures: %s",
+            event.event_id,
+            event.signatures,
+        )
+
+        self.replication_layer.send_pdu(new_pdu, destinations)
+
+        defer.returnValue(None)
+
+    @defer.inlineCallbacks
     def get_state_for_pdu(self, origin, room_id, event_id, do_auth=True):
         yield run_on_reactor()
 
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index dfeeae76db..0f947993d1 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -146,7 +146,7 @@ class MessageHandler(BaseHandler):
                 "end": next_token.to_string(),
             })
 
-        events = yield self._filter_events_for_client(user_id, room_id, events)
+        events = yield self._filter_events_for_client(user_id, events)
 
         time_now = self.clock.time_msec()
 
@@ -162,52 +162,6 @@ class MessageHandler(BaseHandler):
         defer.returnValue(chunk)
 
     @defer.inlineCallbacks
-    def _filter_events_for_client(self, user_id, room_id, events):
-        event_id_to_state = yield self.store.get_state_for_events(
-            frozenset(e.event_id for e in events),
-            types=(
-                (EventTypes.RoomHistoryVisibility, ""),
-                (EventTypes.Member, user_id),
-            )
-        )
-
-        def allowed(event, state):
-            if event.type == EventTypes.RoomHistoryVisibility:
-                return True
-
-            membership_ev = state.get((EventTypes.Member, user_id), None)
-            if membership_ev:
-                membership = membership_ev.membership
-            else:
-                membership = Membership.LEAVE
-
-            if membership == Membership.JOIN:
-                return True
-
-            history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
-            if history:
-                visibility = history.content.get("history_visibility", "shared")
-            else:
-                visibility = "shared"
-
-            if visibility == "public":
-                return True
-            elif visibility == "shared":
-                return True
-            elif visibility == "joined":
-                return membership == Membership.JOIN
-            elif visibility == "invited":
-                return membership == Membership.INVITE
-
-            return True
-
-        defer.returnValue([
-            event
-            for event in events
-            if allowed(event, event_id_to_state[event.event_id])
-        ])
-
-    @defer.inlineCallbacks
     def create_and_send_event(self, event_dict, ratelimit=True,
                               token_id=None, txn_id=None):
         """ Given a dict from a client, create and handle a new event.
@@ -368,6 +322,8 @@ class MessageHandler(BaseHandler):
             user, pagination_config.get_source_config("receipt"), None
         )
 
+        tags_by_room = yield self.store.get_tags_for_user(user_id)
+
         public_room_ids = yield self.store.get_public_room_ids()
 
         limit = pagin_config.limit
@@ -424,7 +380,7 @@ class MessageHandler(BaseHandler):
                 ).addErrback(unwrapFirstError)
 
                 messages = yield self._filter_events_for_client(
-                    user_id, event.room_id, messages
+                    user_id, messages
                 )
 
                 start_token = now_token.copy_and_replace("room_key", token[0])
@@ -444,6 +400,15 @@ class MessageHandler(BaseHandler):
                     serialize_event(c, time_now, as_client_event)
                     for c in current_state.values()
                 ]
+
+                private_user_data = []
+                tags = tags_by_room.get(event.room_id)
+                if tags:
+                    private_user_data.append({
+                        "type": "m.tag",
+                        "content": {"tags": tags},
+                    })
+                d["private_user_data"] = private_user_data
             except:
                 logger.exception("Failed to get snapshot")
 
@@ -493,6 +458,16 @@ class MessageHandler(BaseHandler):
             result = yield self._room_initial_sync_parted(
                 user_id, room_id, pagin_config, member_event
             )
+
+        private_user_data = []
+        tags = yield self.store.get_tags_for_room(user_id, room_id)
+        if tags:
+            private_user_data.append({
+                "type": "m.tag",
+                "content": {"tags": tags},
+            })
+        result["private_user_data"] = private_user_data
+
         defer.returnValue(result)
 
     @defer.inlineCallbacks
@@ -519,11 +494,11 @@ class MessageHandler(BaseHandler):
         )
 
         messages = yield self._filter_events_for_client(
-            user_id, room_id, messages
+            user_id, messages
         )
 
-        start_token = StreamToken(token[0], 0, 0, 0)
-        end_token = StreamToken(token[1], 0, 0, 0)
+        start_token = StreamToken(token[0], 0, 0, 0, 0)
+        end_token = StreamToken(token[1], 0, 0, 0, 0)
 
         time_now = self.clock.time_msec()
 
@@ -599,7 +574,7 @@ class MessageHandler(BaseHandler):
         ).addErrback(unwrapFirstError)
 
         messages = yield self._filter_events_for_client(
-            user_id, room_id, messages
+            user_id, messages
         )
 
         start_token = now_token.copy_and_replace("room_key", token[0])
diff --git a/synapse/handlers/private_user_data.py b/synapse/handlers/private_user_data.py
new file mode 100644
index 0000000000..1778c71325
--- /dev/null
+++ b/synapse/handlers/private_user_data.py
@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 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.
+
+from twisted.internet import defer
+
+
+class PrivateUserDataEventSource(object):
+    def __init__(self, hs):
+        self.store = hs.get_datastore()
+
+    def get_current_key(self, direction='f'):
+        return self.store.get_max_private_user_data_stream_id()
+
+    @defer.inlineCallbacks
+    def get_new_events_for_user(self, user, from_key, limit):
+        user_id = user.to_string()
+        last_stream_id = from_key
+
+        current_stream_id = yield self.store.get_max_private_user_data_stream_id()
+        tags = yield self.store.get_updated_tags(user_id, last_stream_id)
+
+        results = []
+        for room_id, room_tags in tags.items():
+            results.append({
+                "type": "m.tag",
+                "content": {"tags": room_tags},
+                "room_id": room_id,
+            })
+
+        defer.returnValue((results, current_stream_id))
+
+    @defer.inlineCallbacks
+    def get_pagination_rows(self, user, config, key):
+        defer.returnValue(([], config.to_id))
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 3364a5de14..36878a6c20 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -22,12 +22,18 @@ from synapse.types import UserID, RoomAlias, RoomID
 from synapse.api.constants import (
     EventTypes, Membership, JoinRules, RoomCreationPreset,
 )
-from synapse.api.errors import StoreError, SynapseError
+from synapse.api.errors import AuthError, StoreError, SynapseError
 from synapse.util import stringutils, unwrapFirstError
 from synapse.util.async import run_on_reactor
 
+from signedjson.sign import verify_signed_json
+from signedjson.key import decode_verify_key_bytes
+
 from collections import OrderedDict
+from unpaddedbase64 import decode_base64
+
 import logging
+import math
 import string
 
 logger = logging.getLogger(__name__)
@@ -384,7 +390,22 @@ class RoomMemberHandler(BaseHandler):
         if event.membership == Membership.JOIN:
             yield self._do_join(event, context, do_auth=do_auth)
         else:
-            # This is not a JOIN, so we can handle it normally.
+            if event.membership == Membership.LEAVE:
+                is_host_in_room = yield self.is_host_in_room(room_id, context)
+                if not is_host_in_room:
+                    # Rejecting an invite, rather than leaving a joined room
+                    handler = self.hs.get_handlers().federation_handler
+                    inviter = yield self.get_inviter(event)
+                    if not inviter:
+                        # return the same error as join_room_alias does
+                        raise SynapseError(404, "No known servers")
+                    yield handler.do_remotely_reject_invite(
+                        [inviter.domain],
+                        room_id,
+                        event.user_id
+                    )
+                    defer.returnValue({"room_id": room_id})
+                    return
 
             # FIXME: This isn't idempotency.
             if prev_state and prev_state.membership == event.membership:
@@ -408,7 +429,7 @@ class RoomMemberHandler(BaseHandler):
         defer.returnValue({"room_id": room_id})
 
     @defer.inlineCallbacks
-    def join_room_alias(self, joinee, room_alias, do_auth=True, content={}):
+    def join_room_alias(self, joinee, room_alias, content={}):
         directory_handler = self.hs.get_handlers().directory_handler
         mapping = yield directory_handler.get_association(room_alias)
 
@@ -442,8 +463,6 @@ class RoomMemberHandler(BaseHandler):
 
     @defer.inlineCallbacks
     def _do_join(self, event, context, room_hosts=None, do_auth=True):
-        joinee = UserID.from_string(event.state_key)
-        # room_id = RoomID.from_string(event.room_id, self.hs)
         room_id = event.room_id
 
         # XXX: We don't do an auth check if we are doing an invite
@@ -451,41 +470,18 @@ class RoomMemberHandler(BaseHandler):
         # that we are allowed to join when we decide whether or not we
         # need to do the invite/join dance.
 
-        is_host_in_room = yield self.auth.check_host_in_room(
-            event.room_id,
-            self.hs.hostname
-        )
-        if not is_host_in_room:
-            # is *anyone* in the room?
-            room_member_keys = [
-                v for (k, v) in context.current_state.keys() if (
-                    k == "m.room.member"
-                )
-            ]
-            if len(room_member_keys) == 0:
-                # has the room been created so we can join it?
-                create_event = context.current_state.get(("m.room.create", ""))
-                if create_event:
-                    is_host_in_room = True
-
+        is_host_in_room = yield self.is_host_in_room(room_id, context)
         if is_host_in_room:
             should_do_dance = False
         elif room_hosts:  # TODO: Shouldn't this be remote_room_host?
             should_do_dance = True
         else:
-            # TODO(markjh): get prev_state from snapshot
-            prev_state = yield self.store.get_room_member(
-                joinee.to_string(), room_id
-            )
-
-            if prev_state and prev_state.membership == Membership.INVITE:
-                inviter = UserID.from_string(prev_state.user_id)
-
-                should_do_dance = not self.hs.is_mine(inviter)
-                room_hosts = [inviter.domain]
-            else:
+            inviter = yield self.get_inviter(event)
+            if not inviter:
                 # return the same error as join_room_alias does
                 raise SynapseError(404, "No known servers")
+            should_do_dance = not self.hs.is_mine(inviter)
+            room_hosts = [inviter.domain]
 
         if should_do_dance:
             handler = self.hs.get_handlers().federation_handler
@@ -493,8 +489,7 @@ class RoomMemberHandler(BaseHandler):
                 room_hosts,
                 room_id,
                 event.user_id,
-                event.content,  # FIXME To get a non-frozen dict
-                context
+                event.content  # FIXME To get a non-frozen dict
             )
         else:
             logger.debug("Doing normal join")
@@ -512,6 +507,44 @@ class RoomMemberHandler(BaseHandler):
         )
 
     @defer.inlineCallbacks
+    def get_inviter(self, event):
+        # TODO(markjh): get prev_state from snapshot
+        prev_state = yield self.store.get_room_member(
+            event.user_id, event.room_id
+        )
+
+        if prev_state and prev_state.membership == Membership.INVITE:
+            defer.returnValue(UserID.from_string(prev_state.user_id))
+            return
+        elif "third_party_invite" in event.content:
+            if "sender" in event.content["third_party_invite"]:
+                inviter = UserID.from_string(
+                    event.content["third_party_invite"]["sender"]
+                )
+                defer.returnValue(inviter)
+        defer.returnValue(None)
+
+    @defer.inlineCallbacks
+    def is_host_in_room(self, room_id, context):
+        is_host_in_room = yield self.auth.check_host_in_room(
+            room_id,
+            self.hs.hostname
+        )
+        if not is_host_in_room:
+            # is *anyone* in the room?
+            room_member_keys = [
+                v for (k, v) in context.current_state.keys() if (
+                    k == "m.room.member"
+                )
+            ]
+            if len(room_member_keys) == 0:
+                # has the room been created so we can join it?
+                create_event = context.current_state.get(("m.room.create", ""))
+                if create_event:
+                    is_host_in_room = True
+        defer.returnValue(is_host_in_room)
+
+    @defer.inlineCallbacks
     def get_joined_rooms_for_user(self, user):
         """Returns a list of roomids that the user has any of the given
         membership states in."""
@@ -540,6 +573,160 @@ class RoomMemberHandler(BaseHandler):
             suppress_auth=(not do_auth),
         )
 
+    @defer.inlineCallbacks
+    def do_3pid_invite(
+            self,
+            room_id,
+            inviter,
+            medium,
+            address,
+            id_server,
+            display_name,
+            token_id,
+            txn_id
+    ):
+        invitee = yield self._lookup_3pid(
+            id_server, medium, address
+        )
+
+        if invitee:
+            # make sure it looks like a user ID; it'll throw if it's invalid.
+            UserID.from_string(invitee)
+            yield self.hs.get_handlers().message_handler.create_and_send_event(
+                {
+                    "type": EventTypes.Member,
+                    "content": {
+                        "membership": unicode("invite")
+                    },
+                    "room_id": room_id,
+                    "sender": inviter.to_string(),
+                    "state_key": invitee,
+                },
+                token_id=token_id,
+                txn_id=txn_id,
+            )
+        else:
+            yield self._make_and_store_3pid_invite(
+                id_server,
+                display_name,
+                medium,
+                address,
+                room_id,
+                inviter,
+                token_id,
+                txn_id=txn_id
+            )
+
+    @defer.inlineCallbacks
+    def _lookup_3pid(self, id_server, medium, address):
+        """Looks up a 3pid in the passed identity server.
+
+        Args:
+            id_server (str): The server name (including port, if required)
+                of the identity server to use.
+            medium (str): The type of the third party identifier (e.g. "email").
+            address (str): The third party identifier (e.g. "foo@example.com").
+
+        Returns:
+            (str) the matrix ID of the 3pid, or None if it is not recognized.
+        """
+        try:
+            data = yield self.hs.get_simple_http_client().get_json(
+                "https://%s/_matrix/identity/api/v1/lookup" % (id_server,),
+                {
+                    "medium": medium,
+                    "address": address,
+                }
+            )
+
+            if "mxid" in data:
+                if "signatures" not in data:
+                    raise AuthError(401, "No signatures on 3pid binding")
+                self.verify_any_signature(data, id_server)
+                defer.returnValue(data["mxid"])
+
+        except IOError as e:
+            logger.warn("Error from identity server lookup: %s" % (e,))
+            defer.returnValue(None)
+
+    @defer.inlineCallbacks
+    def verify_any_signature(self, data, server_hostname):
+        if server_hostname not in data["signatures"]:
+            raise AuthError(401, "No signature from server %s" % (server_hostname,))
+        for key_name, signature in data["signatures"][server_hostname].items():
+            key_data = yield self.hs.get_simple_http_client().get_json(
+                "https://%s/_matrix/identity/api/v1/pubkey/%s" %
+                (server_hostname, key_name,),
+            )
+            if "public_key" not in key_data:
+                raise AuthError(401, "No public key named %s from %s" %
+                                (key_name, server_hostname,))
+            verify_signed_json(
+                data,
+                server_hostname,
+                decode_verify_key_bytes(key_name, decode_base64(key_data["public_key"]))
+            )
+            return
+
+    @defer.inlineCallbacks
+    def _make_and_store_3pid_invite(
+            self,
+            id_server,
+            display_name,
+            medium,
+            address,
+            room_id,
+            user,
+            token_id,
+            txn_id
+    ):
+        token, public_key, key_validity_url = (
+            yield self._ask_id_server_for_third_party_invite(
+                id_server,
+                medium,
+                address,
+                room_id,
+                user.to_string()
+            )
+        )
+        msg_handler = self.hs.get_handlers().message_handler
+        yield msg_handler.create_and_send_event(
+            {
+                "type": EventTypes.ThirdPartyInvite,
+                "content": {
+                    "display_name": display_name,
+                    "key_validity_url": key_validity_url,
+                    "public_key": public_key,
+                },
+                "room_id": room_id,
+                "sender": user.to_string(),
+                "state_key": token,
+            },
+            token_id=token_id,
+            txn_id=txn_id,
+        )
+
+    @defer.inlineCallbacks
+    def _ask_id_server_for_third_party_invite(
+            self, id_server, medium, address, room_id, sender):
+        is_url = "https://%s/_matrix/identity/api/v1/store-invite" % (id_server,)
+        data = yield self.hs.get_simple_http_client().post_urlencoded_get_json(
+            is_url,
+            {
+                "medium": medium,
+                "address": address,
+                "room_id": room_id,
+                "sender": sender,
+            }
+        )
+        # TODO: Check for success
+        token = data["token"]
+        public_key = data["public_key"]
+        key_validity_url = "https://%s/_matrix/identity/api/v1/pubkey/isvalid" % (
+            id_server,
+        )
+        defer.returnValue((token, public_key, key_validity_url))
+
 
 class RoomListHandler(BaseHandler):
 
@@ -561,6 +748,60 @@ class RoomListHandler(BaseHandler):
         defer.returnValue({"start": "START", "end": "END", "chunk": chunk})
 
 
+class RoomContextHandler(BaseHandler):
+    @defer.inlineCallbacks
+    def get_event_context(self, user, room_id, event_id, limit):
+        """Retrieves events, pagination tokens and state around a given event
+        in a room.
+
+        Args:
+            user (UserID)
+            room_id (str)
+            event_id (str)
+            limit (int): The maximum number of events to return in total
+                (excluding state).
+
+        Returns:
+            dict
+        """
+        before_limit = math.floor(limit/2.)
+        after_limit = limit - before_limit
+
+        now_token = yield self.hs.get_event_sources().get_current_token()
+
+        results = yield self.store.get_events_around(
+            room_id, event_id, before_limit, after_limit
+        )
+
+        results["events_before"] = yield self._filter_events_for_client(
+            user.to_string(), results["events_before"]
+        )
+
+        results["events_after"] = yield self._filter_events_for_client(
+            user.to_string(), results["events_after"]
+        )
+
+        if results["events_after"]:
+            last_event_id = results["events_after"][-1].event_id
+        else:
+            last_event_id = event_id
+
+        state = yield self.store.get_state_for_events(
+            [last_event_id], None
+        )
+        results["state"] = state[last_event_id].values()
+
+        results["start"] = now_token.copy_and_replace(
+            "room_key", results["start"]
+        ).to_string()
+
+        results["end"] = now_token.copy_and_replace(
+            "room_key", results["end"]
+        ).to_string()
+
+        defer.returnValue(results)
+
+
 class RoomEventSource(object):
     def __init__(self, hs):
         self.store = hs.get_datastore()
diff --git a/synapse/handlers/search.py b/synapse/handlers/search.py
new file mode 100644
index 0000000000..2718e9482e
--- /dev/null
+++ b/synapse/handlers/search.py
@@ -0,0 +1,154 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 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.
+
+from twisted.internet import defer
+
+from ._base import BaseHandler
+
+from synapse.api.constants import Membership
+from synapse.api.filtering import Filter
+from synapse.api.errors import SynapseError
+from synapse.events.utils import serialize_event
+
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class SearchHandler(BaseHandler):
+
+    def __init__(self, hs):
+        super(SearchHandler, self).__init__(hs)
+
+    @defer.inlineCallbacks
+    def search(self, user, content):
+        """Performs a full text search for a user.
+
+        Args:
+            user (UserID)
+            content (dict): Search parameters
+
+        Returns:
+            dict to be returned to the client with results of search
+        """
+
+        try:
+            search_term = content["search_categories"]["room_events"]["search_term"]
+            keys = content["search_categories"]["room_events"].get("keys", [
+                "content.body", "content.name", "content.topic",
+            ])
+            filter_dict = content["search_categories"]["room_events"].get("filter", {})
+            event_context = content["search_categories"]["room_events"].get(
+                "event_context", None
+            )
+
+            if event_context is not None:
+                before_limit = int(event_context.get(
+                    "before_limit", 5
+                ))
+                after_limit = int(event_context.get(
+                    "after_limit", 5
+                ))
+        except KeyError:
+            raise SynapseError(400, "Invalid search query")
+
+        search_filter = Filter(filter_dict)
+
+        # TODO: Search through left rooms too
+        rooms = yield self.store.get_rooms_for_user_where_membership_is(
+            user.to_string(),
+            membership_list=[Membership.JOIN],
+            # membership_list=[Membership.JOIN, Membership.LEAVE, Membership.Ban],
+        )
+        room_ids = set(r.room_id for r in rooms)
+
+        room_ids = search_filter.filter_rooms(room_ids)
+
+        rank_map, event_map, _ = yield self.store.search_msgs(
+            room_ids, search_term, keys
+        )
+
+        filtered_events = search_filter.filter(event_map.values())
+
+        allowed_events = yield self._filter_events_for_client(
+            user.to_string(), filtered_events
+        )
+
+        allowed_events.sort(key=lambda e: -rank_map[e.event_id])
+        allowed_events = allowed_events[:search_filter.limit()]
+
+        if event_context is not None:
+            now_token = yield self.hs.get_event_sources().get_current_token()
+
+            contexts = {}
+            for event in allowed_events:
+                res = yield self.store.get_events_around(
+                    event.room_id, event.event_id, before_limit, after_limit
+                )
+
+                res["events_before"] = yield self._filter_events_for_client(
+                    user.to_string(), res["events_before"]
+                )
+
+                res["events_after"] = yield self._filter_events_for_client(
+                    user.to_string(), res["events_after"]
+                )
+
+                res["start"] = now_token.copy_and_replace(
+                    "room_key", res["start"]
+                ).to_string()
+
+                res["end"] = now_token.copy_and_replace(
+                    "room_key", res["end"]
+                ).to_string()
+
+                contexts[event.event_id] = res
+        else:
+            contexts = {}
+
+        # TODO: Add a limit
+
+        time_now = self.clock.time_msec()
+
+        for context in contexts.values():
+            context["events_before"] = [
+                serialize_event(e, time_now)
+                for e in context["events_before"]
+            ]
+            context["events_after"] = [
+                serialize_event(e, time_now)
+                for e in context["events_after"]
+            ]
+
+        results = {
+            e.event_id: {
+                "rank": rank_map[e.event_id],
+                "result": serialize_event(e, time_now),
+                "context": contexts.get(e.event_id, {}),
+            }
+            for e in allowed_events
+        }
+
+        logger.info("Found %d results", len(results))
+
+        defer.returnValue({
+            "search_categories": {
+                "room_events": {
+                    "results": results,
+                    "count": len(results)
+                }
+            }
+        })
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 21cf50101a..d6527c1ae8 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -51,6 +51,7 @@ class JoinedSyncResult(collections.namedtuple("JoinedSyncResult", [
     "timeline",
     "state",
     "ephemeral",
+    "private_user_data",
 ])):
     __slots__ = []
 
@@ -58,7 +59,31 @@ class JoinedSyncResult(collections.namedtuple("JoinedSyncResult", [
         """Make the result appear empty if there are no updates. This is used
         to tell if room needs to be part of the sync result.
         """
-        return bool(self.timeline or self.state or self.ephemeral)
+        return bool(
+            self.timeline
+            or self.state
+            or self.ephemeral
+            or self.private_user_data
+        )
+
+
+class ArchivedSyncResult(collections.namedtuple("JoinedSyncResult", [
+    "room_id",
+    "timeline",
+    "state",
+    "private_user_data",
+])):
+    __slots__ = []
+
+    def __nonzero__(self):
+        """Make the result appear empty if there are no updates. This is used
+        to tell if room needs to be part of the sync result.
+        """
+        return bool(
+            self.timeline
+            or self.state
+            or self.private_user_data
+        )
 
 
 class InvitedSyncResult(collections.namedtuple("InvitedSyncResult", [
@@ -67,12 +92,17 @@ class InvitedSyncResult(collections.namedtuple("InvitedSyncResult", [
 ])):
     __slots__ = []
 
+    def __nonzero__(self):
+        """Invited rooms should always be reported to the client"""
+        return True
+
 
 class SyncResult(collections.namedtuple("SyncResult", [
     "next_batch",  # Token for the next sync
     "presence",  # List of presence events for the user.
     "joined",  # JoinedSyncResult for each joined room.
     "invited",  # InvitedSyncResult for each invited room.
+    "archived",  # ArchivedSyncResult for each archived room.
 ])):
     __slots__ = []
 
@@ -94,15 +124,20 @@ class SyncHandler(BaseHandler):
         self.clock = hs.get_clock()
 
     @defer.inlineCallbacks
-    def wait_for_sync_for_user(self, sync_config, since_token=None, timeout=0):
+    def wait_for_sync_for_user(self, sync_config, since_token=None, timeout=0,
+                               full_state=False):
         """Get the sync for a client if we have new data for it now. Otherwise
         wait for new data to arrive on the server. If the timeout expires, then
         return an empty sync result.
         Returns:
             A Deferred SyncResult.
         """
-        if timeout == 0 or since_token is None:
-            result = yield self.current_sync_for_user(sync_config, since_token)
+
+        if timeout == 0 or since_token is None or full_state:
+            # we are going to return immediately, so don't bother calling
+            # notifier.wait_for_events.
+            result = yield self.current_sync_for_user(sync_config, since_token,
+                                                      full_state=full_state)
             defer.returnValue(result)
         else:
             def current_sync_callback(before_token, after_token):
@@ -127,24 +162,33 @@ class SyncHandler(BaseHandler):
             )
             defer.returnValue(result)
 
-    def current_sync_for_user(self, sync_config, since_token=None):
+    def current_sync_for_user(self, sync_config, since_token=None,
+                              full_state=False):
         """Get the sync for client needed to match what the server has now.
         Returns:
             A Deferred SyncResult.
         """
-        if since_token is None:
-            return self.initial_sync(sync_config)
+        if since_token is None or full_state:
+            return self.full_state_sync(sync_config, since_token)
         else:
             return self.incremental_sync_with_gap(sync_config, since_token)
 
     @defer.inlineCallbacks
-    def initial_sync(self, sync_config):
-        """Get a sync for a client which is starting without any state
+    def full_state_sync(self, sync_config, timeline_since_token):
+        """Get a sync for a client which is starting without any state.
+
+        If a 'message_since_token' is given, only timeline events which have
+        happened since that token will be returned.
+
         Returns:
             A Deferred SyncResult.
         """
         now_token = yield self.event_sources.get_current_token()
 
+        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
+            sync_config, now_token
+        )
+
         presence_stream = self.event_sources.sources["presence"]
         # TODO (mjark): This looks wrong, shouldn't we be getting the presence
         # UP to the present rather than after the present?
@@ -156,15 +200,30 @@ class SyncHandler(BaseHandler):
         )
         room_list = yield self.store.get_rooms_for_user_where_membership_is(
             user_id=sync_config.user.to_string(),
-            membership_list=[Membership.INVITE, Membership.JOIN]
+            membership_list=(
+                Membership.INVITE,
+                Membership.JOIN,
+                Membership.LEAVE,
+                Membership.BAN
+            )
+        )
+
+        tags_by_room = yield self.store.get_tags_for_user(
+            sync_config.user.to_string()
         )
 
         joined = []
         invited = []
+        archived = []
         for event in room_list:
             if event.membership == Membership.JOIN:
-                room_sync = yield self.initial_sync_for_joined_room(
-                    event.room_id, sync_config, now_token,
+                room_sync = yield self.full_state_sync_for_joined_room(
+                    room_id=event.room_id,
+                    sync_config=sync_config,
+                    now_token=now_token,
+                    timeline_since_token=timeline_since_token,
+                    ephemeral_by_room=ephemeral_by_room,
+                    tags_by_room=tags_by_room,
                 )
                 joined.append(room_sync)
             elif event.membership == Membership.INVITE:
@@ -173,23 +232,39 @@ class SyncHandler(BaseHandler):
                     room_id=event.room_id,
                     invite=invite,
                 ))
+            elif event.membership in (Membership.LEAVE, Membership.BAN):
+                leave_token = now_token.copy_and_replace(
+                    "room_key", "s%d" % (event.stream_ordering,)
+                )
+                room_sync = yield self.full_state_sync_for_archived_room(
+                    sync_config=sync_config,
+                    room_id=event.room_id,
+                    leave_event_id=event.event_id,
+                    leave_token=leave_token,
+                    timeline_since_token=timeline_since_token,
+                    tags_by_room=tags_by_room,
+                )
+                archived.append(room_sync)
 
         defer.returnValue(SyncResult(
             presence=presence,
             joined=joined,
             invited=invited,
+            archived=archived,
             next_batch=now_token,
         ))
 
     @defer.inlineCallbacks
-    def initial_sync_for_joined_room(self, room_id, sync_config, now_token):
+    def full_state_sync_for_joined_room(self, room_id, sync_config,
+                                        now_token, timeline_since_token,
+                                        ephemeral_by_room, tags_by_room):
         """Sync a room for a client which is starting without any state
         Returns:
             A Deferred JoinedSyncResult.
         """
 
         batch = yield self.load_filtered_recents(
-            room_id, sync_config, now_token,
+            room_id, sync_config, now_token, since_token=timeline_since_token
         )
 
         current_state = yield self.state_handler.get_current_state(
@@ -201,7 +276,92 @@ class SyncHandler(BaseHandler):
             room_id=room_id,
             timeline=batch,
             state=current_state_events,
-            ephemeral=[],
+            ephemeral=ephemeral_by_room.get(room_id, []),
+            private_user_data=self.private_user_data_for_room(
+                room_id, tags_by_room
+            ),
+        ))
+
+    def private_user_data_for_room(self, room_id, tags_by_room):
+        private_user_data = []
+        tags = tags_by_room.get(room_id)
+        if tags:
+            private_user_data.append({
+                "type": "m.tag",
+                "content": {"tags": tags},
+            })
+        return private_user_data
+
+    @defer.inlineCallbacks
+    def ephemeral_by_room(self, sync_config, now_token, since_token=None):
+        """Get the ephemeral events for each room the user is in
+        Args:
+            sync_config (SyncConfig): The flags, filters and user for the sync.
+            now_token (StreamToken): Where the server is currently up to.
+            since_token (StreamToken): Where the server was when the client
+                last synced.
+        Returns:
+            A tuple of the now StreamToken, updated to reflect the which typing
+            events are included, and a dict mapping from room_id to a list of
+            typing events for that room.
+        """
+
+        typing_key = since_token.typing_key if since_token else "0"
+
+        typing_source = self.event_sources.sources["typing"]
+        typing, typing_key = yield typing_source.get_new_events_for_user(
+            user=sync_config.user,
+            from_key=typing_key,
+            limit=sync_config.filter.ephemeral_limit(),
+        )
+        now_token = now_token.copy_and_replace("typing_key", typing_key)
+
+        ephemeral_by_room = {}
+
+        for event in typing:
+            room_id = event.pop("room_id")
+            ephemeral_by_room.setdefault(room_id, []).append(event)
+
+        receipt_key = since_token.receipt_key if since_token else "0"
+
+        receipt_source = self.event_sources.sources["receipt"]
+        receipts, receipt_key = yield receipt_source.get_new_events_for_user(
+            user=sync_config.user,
+            from_key=receipt_key,
+            limit=sync_config.filter.ephemeral_limit(),
+        )
+        now_token = now_token.copy_and_replace("receipt_key", receipt_key)
+
+        for event in receipts:
+            room_id = event.pop("room_id")
+            ephemeral_by_room.setdefault(room_id, []).append(event)
+
+        defer.returnValue((now_token, ephemeral_by_room))
+
+    @defer.inlineCallbacks
+    def full_state_sync_for_archived_room(self, room_id, sync_config,
+                                          leave_event_id, leave_token,
+                                          timeline_since_token, tags_by_room):
+        """Sync a room for a client which is starting without any state
+        Returns:
+            A Deferred JoinedSyncResult.
+        """
+
+        batch = yield self.load_filtered_recents(
+            room_id, sync_config, leave_token, since_token=timeline_since_token
+        )
+
+        leave_state = yield self.store.get_state_for_events(
+            [leave_event_id], None
+        )
+
+        defer.returnValue(ArchivedSyncResult(
+            room_id=room_id,
+            timeline=batch,
+            state=leave_state[leave_event_id].values(),
+            private_user_data=self.private_user_data_for_room(
+                room_id, tags_by_room
+            ),
         ))
 
     @defer.inlineCallbacks
@@ -221,18 +381,9 @@ class SyncHandler(BaseHandler):
         )
         now_token = now_token.copy_and_replace("presence_key", presence_key)
 
-        typing_source = self.event_sources.sources["typing"]
-        typing, typing_key = yield typing_source.get_new_events_for_user(
-            user=sync_config.user,
-            from_key=since_token.typing_key,
-            limit=sync_config.filter.ephemeral_limit(),
+        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
+            sync_config, now_token, since_token
         )
-        now_token = now_token.copy_and_replace("typing_key", typing_key)
-
-        typing_by_room = {event["room_id"]: [event] for event in typing}
-        for event in typing:
-            event.pop("room_id")
-        logger.debug("Typing %r", typing_by_room)
 
         rm_handler = self.hs.get_handlers().room_member_handler
         app_service = yield self.store.get_app_service_by_user_id(
@@ -256,19 +407,28 @@ class SyncHandler(BaseHandler):
             limit=timeline_limit + 1,
         )
 
+        tags_by_room = yield self.store.get_updated_tags(
+            sync_config.user.to_string(),
+            since_token.private_user_data_key,
+        )
+
         joined = []
+        archived = []
         if len(room_events) <= timeline_limit:
             # There is no gap in any of the rooms. Therefore we can just
             # partition the new events by room and return them.
             invite_events = []
+            leave_events = []
             events_by_room_id = {}
             for event in room_events:
                 events_by_room_id.setdefault(event.room_id, []).append(event)
                 if event.room_id not in joined_room_ids:
                     if (event.type == EventTypes.Member
-                            and event.membership == Membership.INVITE
                             and event.state_key == sync_config.user.to_string()):
-                        invite_events.append(event)
+                        if event.membership == Membership.INVITE:
+                            invite_events.append(event)
+                        elif event.membership in (Membership.LEAVE, Membership.BAN):
+                            leave_events.append(event)
 
             for room_id in joined_room_ids:
                 recents = events_by_room_id.get(room_id, [])
@@ -280,7 +440,7 @@ class SyncHandler(BaseHandler):
                 else:
                     prev_batch = now_token
 
-                state = yield self.check_joined_room(
+                state, limited = yield self.check_joined_room(
                     sync_config, room_id, state
                 )
 
@@ -289,26 +449,40 @@ class SyncHandler(BaseHandler):
                     timeline=TimelineBatch(
                         events=recents,
                         prev_batch=prev_batch,
-                        limited=False,
+                        limited=limited,
                     ),
                     state=state,
-                    ephemeral=typing_by_room.get(room_id, [])
+                    ephemeral=ephemeral_by_room.get(room_id, []),
+                    private_user_data=self.private_user_data_for_room(
+                        room_id, tags_by_room
+                    ),
                 )
                 if room_sync:
                     joined.append(room_sync)
+
         else:
             invite_events = yield self.store.get_invites_for_user(
                 sync_config.user.to_string()
             )
 
+            leave_events = yield self.store.get_leave_and_ban_events_for_user(
+                sync_config.user.to_string()
+            )
+
             for room_id in joined_room_ids:
                 room_sync = yield self.incremental_sync_with_gap_for_room(
                     room_id, sync_config, since_token, now_token,
-                    typing_by_room
+                    ephemeral_by_room, tags_by_room
                 )
                 if room_sync:
                     joined.append(room_sync)
 
+        for leave_event in leave_events:
+            room_sync = yield self.incremental_sync_for_archived_room(
+                sync_config, leave_event, since_token, tags_by_room
+            )
+            archived.append(room_sync)
+
         invited = [
             InvitedSyncResult(room_id=event.room_id, invite=event)
             for event in invite_events
@@ -318,56 +492,11 @@ class SyncHandler(BaseHandler):
             presence=presence,
             joined=joined,
             invited=invited,
+            archived=archived,
             next_batch=now_token,
         ))
 
     @defer.inlineCallbacks
-    def _filter_events_for_client(self, user_id, room_id, events):
-        event_id_to_state = yield self.store.get_state_for_events(
-            frozenset(e.event_id for e in events),
-            types=(
-                (EventTypes.RoomHistoryVisibility, ""),
-                (EventTypes.Member, user_id),
-            )
-        )
-
-        def allowed(event, state):
-            if event.type == EventTypes.RoomHistoryVisibility:
-                return True
-
-            membership_ev = state.get((EventTypes.Member, user_id), None)
-            if membership_ev:
-                membership = membership_ev.membership
-            else:
-                membership = Membership.LEAVE
-
-            if membership == Membership.JOIN:
-                return True
-
-            history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
-            if history:
-                visibility = history.content.get("history_visibility", "shared")
-            else:
-                visibility = "shared"
-
-            if visibility == "public":
-                return True
-            elif visibility == "shared":
-                return True
-            elif visibility == "joined":
-                return membership == Membership.JOIN
-            elif visibility == "invited":
-                return membership == Membership.INVITE
-
-            return True
-
-        defer.returnValue([
-            event
-            for event in events
-            if allowed(event, event_id_to_state[event.event_id])
-        ])
-
-    @defer.inlineCallbacks
     def load_filtered_recents(self, room_id, sync_config, now_token,
                               since_token=None):
         limited = True
@@ -390,7 +519,7 @@ class SyncHandler(BaseHandler):
             end_key = "s" + room_key.split('-')[-1]
             loaded_recents = sync_config.filter.filter_room_timeline(events)
             loaded_recents = yield self._filter_events_for_client(
-                sync_config.user.to_string(), room_id, loaded_recents,
+                sync_config.user.to_string(), loaded_recents,
             )
             loaded_recents.extend(recents)
             recents = loaded_recents
@@ -414,7 +543,7 @@ class SyncHandler(BaseHandler):
     @defer.inlineCallbacks
     def incremental_sync_with_gap_for_room(self, room_id, sync_config,
                                            since_token, now_token,
-                                           typing_by_room):
+                                           ephemeral_by_room, tags_by_room):
         """ Get the incremental delta needed to bring the client up to date for
         the room. Gives the client the most recent events and the changes to
         state.
@@ -447,7 +576,7 @@ class SyncHandler(BaseHandler):
             current_state=current_state_events,
         )
 
-        state_events_delta = yield self.check_joined_room(
+        state_events_delta, _ = yield self.check_joined_room(
             sync_config, room_id, state_events_delta
         )
 
@@ -455,7 +584,62 @@ class SyncHandler(BaseHandler):
             room_id=room_id,
             timeline=batch,
             state=state_events_delta,
-            ephemeral=typing_by_room.get(room_id, [])
+            ephemeral=ephemeral_by_room.get(room_id, []),
+            private_user_data=self.private_user_data_for_room(
+                room_id, tags_by_room
+            ),
+        )
+
+        logging.debug("Room sync: %r", room_sync)
+
+        defer.returnValue(room_sync)
+
+    @defer.inlineCallbacks
+    def incremental_sync_for_archived_room(self, sync_config, leave_event,
+                                           since_token, tags_by_room):
+        """ Get the incremental delta needed to bring the client up to date for
+        the archived room.
+        Returns:
+            A Deferred ArchivedSyncResult
+        """
+
+        stream_token = yield self.store.get_stream_token_for_event(
+            leave_event.event_id
+        )
+
+        leave_token = since_token.copy_and_replace("room_key", stream_token)
+
+        batch = yield self.load_filtered_recents(
+            leave_event.room_id, sync_config, leave_token, since_token,
+        )
+
+        logging.debug("Recents %r", batch)
+
+        # TODO(mjark): This seems racy since this isn't being passed a
+        # token to indicate what point in the stream this is
+        leave_state = yield self.store.get_state_for_events(
+            [leave_event.event_id], None
+        )
+
+        state_events_at_leave = leave_state[leave_event.event_id].values()
+
+        state_at_previous_sync = yield self.get_state_at_previous_sync(
+            leave_event.room_id, since_token=since_token
+        )
+
+        state_events_delta = yield self.compute_state_delta(
+            since_token=since_token,
+            previous_state=state_at_previous_sync,
+            current_state=state_events_at_leave,
+        )
+
+        room_sync = ArchivedSyncResult(
+            room_id=leave_event.room_id,
+            timeline=batch,
+            state=state_events_delta,
+            private_user_data=self.private_user_data_for_room(
+                leave_event.room_id, tags_by_room
+            ),
         )
 
         logging.debug("Room sync: %r", room_sync)
@@ -505,6 +689,7 @@ class SyncHandler(BaseHandler):
     @defer.inlineCallbacks
     def check_joined_room(self, sync_config, room_id, state_delta):
         joined = False
+        limited = False
         for event in state_delta:
             if (
                 event.type == EventTypes.Member
@@ -516,5 +701,6 @@ class SyncHandler(BaseHandler):
         if joined:
             res = yield self.state_handler.get_current_state(room_id)
             state_delta = res.values()
+            limited = True
 
-        defer.returnValue(state_delta)
+        defer.returnValue((state_delta, limited))