diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index a0464ae5c..8580ada60 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -34,6 +34,7 @@ class DirectoryHandler(BaseHandler):
 
         self.state = hs.get_state_handler()
         self.appservice_handler = hs.get_application_service_handler()
+        self.event_creation_handler = hs.get_event_creation_handler()
 
         self.federation = hs.get_replication_layer()
         self.federation.register_query_handler(
@@ -249,8 +250,7 @@ class DirectoryHandler(BaseHandler):
     def send_room_alias_update_event(self, requester, user_id, room_id):
         aliases = yield self.store.get_aliases_for_room(room_id)
 
-        msg_handler = self.hs.get_handlers().message_handler
-        yield msg_handler.create_and_send_nonmember_event(
+        yield self.event_creation_handler.create_and_send_nonmember_event(
             requester,
             {
                 "type": EventTypes.Aliases,
@@ -272,8 +272,7 @@ class DirectoryHandler(BaseHandler):
         if not alias_event or alias_event.content.get("alias", "") != alias_str:
             return
 
-        msg_handler = self.hs.get_handlers().message_handler
-        yield msg_handler.create_and_send_nonmember_event(
+        yield self.event_creation_handler.create_and_send_nonmember_event(
             requester,
             {
                 "type": EventTypes.CanonicalAlias,
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 643e813b1..46bcf8b08 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# 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.
@@ -75,6 +76,7 @@ class FederationHandler(BaseHandler):
         self.is_mine_id = hs.is_mine_id
         self.pusher_pool = hs.get_pusherpool()
         self.spam_checker = hs.get_spam_checker()
+        self.event_creation_handler = hs.get_event_creation_handler()
 
         self.replication_layer.set_handler(self)
 
@@ -1007,8 +1009,7 @@ class FederationHandler(BaseHandler):
         })
 
         try:
-            message_handler = self.hs.get_handlers().message_handler
-            event, context = yield message_handler._create_new_client_event(
+            event, context = yield self.event_creation_handler.create_new_client_event(
                 builder=builder,
             )
         except AuthError as e:
@@ -1248,8 +1249,7 @@ class FederationHandler(BaseHandler):
             "state_key": user_id,
         })
 
-        message_handler = self.hs.get_handlers().message_handler
-        event, context = yield message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder=builder,
         )
 
@@ -2130,8 +2130,7 @@ class FederationHandler(BaseHandler):
         if (yield self.auth.check_host_in_room(room_id, self.hs.hostname)):
             builder = self.event_builder_factory.new(event_dict)
             EventValidator().validate_new(builder)
-            message_handler = self.hs.get_handlers().message_handler
-            event, context = yield message_handler._create_new_client_event(
+            event, context = yield self.event_creation_handler.create_new_client_event(
                 builder=builder
             )
 
@@ -2169,8 +2168,7 @@ class FederationHandler(BaseHandler):
         """
         builder = self.event_builder_factory.new(event_dict)
 
-        message_handler = self.hs.get_handlers().message_handler
-        event, context = yield message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder=builder,
         )
 
@@ -2220,8 +2218,9 @@ class FederationHandler(BaseHandler):
 
         builder = self.event_builder_factory.new(event_dict)
         EventValidator().validate_new(builder)
-        message_handler = self.hs.get_handlers().message_handler
-        event, context = yield message_handler._create_new_client_event(builder=builder)
+        event, context = yield self.event_creation_handler.create_new_client_event(
+            builder=builder,
+        )
         defer.returnValue((event, context))
 
     @defer.inlineCallbacks
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 21f1717dd..154072181 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014 - 2016 OpenMarket Ltd
-# Copyright 2017 New Vector Ltd
+# Copyright 2017 - 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.
@@ -47,21 +47,9 @@ class MessageHandler(BaseHandler):
         self.hs = hs
         self.state = hs.get_state_handler()
         self.clock = hs.get_clock()
-        self.validator = EventValidator()
-        self.profile_handler = hs.get_profile_handler()
 
         self.pagination_lock = ReadWriteLock()
 
-        self.pusher_pool = hs.get_pusherpool()
-
-        # We arbitrarily limit concurrent event creation for a room to 5.
-        # This is to stop us from diverging history *too* much.
-        self.limiter = Limiter(max_count=5)
-
-        self.action_generator = hs.get_action_generator()
-
-        self.spam_checker = hs.get_spam_checker()
-
     @defer.inlineCallbacks
     def purge_history(self, room_id, event_id):
         event = yield self.store.get_event(event_id)
@@ -182,166 +170,6 @@ class MessageHandler(BaseHandler):
 
         defer.returnValue(chunk)
 
-    @defer.inlineCallbacks
-    def create_event(self, requester, event_dict, token_id=None, txn_id=None,
-                     prev_event_ids=None):
-        """
-        Given a dict from a client, create a new event.
-
-        Creates an FrozenEvent object, filling out auth_events, prev_events,
-        etc.
-
-        Adds display names to Join membership events.
-
-        Args:
-            requester
-            event_dict (dict): An entire event
-            token_id (str)
-            txn_id (str)
-            prev_event_ids (list): The prev event ids to use when creating the event
-
-        Returns:
-            Tuple of created event (FrozenEvent), Context
-        """
-        builder = self.event_builder_factory.new(event_dict)
-
-        with (yield self.limiter.queue(builder.room_id)):
-            self.validator.validate_new(builder)
-
-            if builder.type == EventTypes.Member:
-                membership = builder.content.get("membership", None)
-                target = UserID.from_string(builder.state_key)
-
-                if membership in {Membership.JOIN, Membership.INVITE}:
-                    # If event doesn't include a display name, add one.
-                    profile = self.profile_handler
-                    content = builder.content
-
-                    try:
-                        if "displayname" not in content:
-                            content["displayname"] = yield profile.get_displayname(target)
-                        if "avatar_url" not in content:
-                            content["avatar_url"] = yield profile.get_avatar_url(target)
-                    except Exception as e:
-                        logger.info(
-                            "Failed to get profile information for %r: %s",
-                            target, e
-                        )
-
-            if token_id is not None:
-                builder.internal_metadata.token_id = token_id
-
-            if txn_id is not None:
-                builder.internal_metadata.txn_id = txn_id
-
-            event, context = yield self._create_new_client_event(
-                builder=builder,
-                requester=requester,
-                prev_event_ids=prev_event_ids,
-            )
-
-        defer.returnValue((event, context))
-
-    @defer.inlineCallbacks
-    def send_nonmember_event(self, requester, event, context, ratelimit=True):
-        """
-        Persists and notifies local clients and federation of an event.
-
-        Args:
-            event (FrozenEvent) the event to send.
-            context (Context) the context of the event.
-            ratelimit (bool): Whether to rate limit this send.
-            is_guest (bool): Whether the sender is a guest.
-        """
-        if event.type == EventTypes.Member:
-            raise SynapseError(
-                500,
-                "Tried to send member event through non-member codepath"
-            )
-
-        # We check here if we are currently being rate limited, so that we
-        # don't do unnecessary work. We check again just before we actually
-        # send the event.
-        yield self.ratelimit(requester, update=False)
-
-        user = UserID.from_string(event.sender)
-
-        assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
-
-        if event.is_state():
-            prev_state = yield self.deduplicate_state_event(event, context)
-            if prev_state is not None:
-                defer.returnValue(prev_state)
-
-        yield self.handle_new_client_event(
-            requester=requester,
-            event=event,
-            context=context,
-            ratelimit=ratelimit,
-        )
-
-        if event.type == EventTypes.Message:
-            presence = self.hs.get_presence_handler()
-            # We don't want to block sending messages on any presence code. This
-            # matters as sometimes presence code can take a while.
-            preserve_fn(presence.bump_presence_active_time)(user)
-
-    @defer.inlineCallbacks
-    def deduplicate_state_event(self, event, context):
-        """
-        Checks whether event is in the latest resolved state in context.
-
-        If so, returns the version of the event in context.
-        Otherwise, returns None.
-        """
-        prev_event_id = context.prev_state_ids.get((event.type, event.state_key))
-        prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
-        if not prev_event:
-            return
-
-        if prev_event and event.user_id == prev_event.user_id:
-            prev_content = encode_canonical_json(prev_event.content)
-            next_content = encode_canonical_json(event.content)
-            if prev_content == next_content:
-                defer.returnValue(prev_event)
-        return
-
-    @defer.inlineCallbacks
-    def create_and_send_nonmember_event(
-        self,
-        requester,
-        event_dict,
-        ratelimit=True,
-        txn_id=None
-    ):
-        """
-        Creates an event, then sends it.
-
-        See self.create_event and self.send_nonmember_event.
-        """
-        event, context = yield self.create_event(
-            requester,
-            event_dict,
-            token_id=requester.access_token_id,
-            txn_id=txn_id
-        )
-
-        spam_error = self.spam_checker.check_event_for_spam(event)
-        if spam_error:
-            if not isinstance(spam_error, basestring):
-                spam_error = "Spam is not permitted here"
-            raise SynapseError(
-                403, spam_error, Codes.FORBIDDEN
-            )
-
-        yield self.send_nonmember_event(
-            requester,
-            event,
-            context,
-            ratelimit=ratelimit,
-        )
-        defer.returnValue(event)
-
     @defer.inlineCallbacks
     def get_room_data(self, user_id=None, room_id=None,
                       event_type=None, state_key="", is_guest=False):
@@ -470,9 +298,197 @@ class MessageHandler(BaseHandler):
             for user_id, profile in users_with_profile.iteritems()
         })
 
-    @measure_func("_create_new_client_event")
+
+class EventCreationHandler(object):
+    def __init__(self, hs):
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastore()
+        self.state = hs.get_state_handler()
+        self.clock = hs.get_clock()
+        self.validator = EventValidator()
+        self.profile_handler = hs.get_profile_handler()
+        self.event_builder_factory = hs.get_event_builder_factory()
+        self.server_name = hs.hostname
+        self.ratelimiter = hs.get_ratelimiter()
+        self.notifier = hs.get_notifier()
+
+        # This is only used to get at ratelimit function, and maybe_kick_guest_users
+        self.base_handler = BaseHandler(hs)
+
+        self.pusher_pool = hs.get_pusherpool()
+
+        # We arbitrarily limit concurrent event creation for a room to 5.
+        # This is to stop us from diverging history *too* much.
+        self.limiter = Limiter(max_count=5)
+
+        self.action_generator = hs.get_action_generator()
+
+        self.spam_checker = hs.get_spam_checker()
+
     @defer.inlineCallbacks
-    def _create_new_client_event(self, builder, requester=None, prev_event_ids=None):
+    def create_event(self, requester, event_dict, token_id=None, txn_id=None,
+                     prev_event_ids=None):
+        """
+        Given a dict from a client, create a new event.
+
+        Creates an FrozenEvent object, filling out auth_events, prev_events,
+        etc.
+
+        Adds display names to Join membership events.
+
+        Args:
+            requester
+            event_dict (dict): An entire event
+            token_id (str)
+            txn_id (str)
+            prev_event_ids (list): The prev event ids to use when creating the event
+
+        Returns:
+            Tuple of created event (FrozenEvent), Context
+        """
+        builder = self.event_builder_factory.new(event_dict)
+
+        with (yield self.limiter.queue(builder.room_id)):
+            self.validator.validate_new(builder)
+
+            if builder.type == EventTypes.Member:
+                membership = builder.content.get("membership", None)
+                target = UserID.from_string(builder.state_key)
+
+                if membership in {Membership.JOIN, Membership.INVITE}:
+                    # If event doesn't include a display name, add one.
+                    profile = self.profile_handler
+                    content = builder.content
+
+                    try:
+                        if "displayname" not in content:
+                            content["displayname"] = yield profile.get_displayname(target)
+                        if "avatar_url" not in content:
+                            content["avatar_url"] = yield profile.get_avatar_url(target)
+                    except Exception as e:
+                        logger.info(
+                            "Failed to get profile information for %r: %s",
+                            target, e
+                        )
+
+            if token_id is not None:
+                builder.internal_metadata.token_id = token_id
+
+            if txn_id is not None:
+                builder.internal_metadata.txn_id = txn_id
+
+            event, context = yield self.create_new_client_event(
+                builder=builder,
+                requester=requester,
+                prev_event_ids=prev_event_ids,
+            )
+
+        defer.returnValue((event, context))
+
+    @defer.inlineCallbacks
+    def send_nonmember_event(self, requester, event, context, ratelimit=True):
+        """
+        Persists and notifies local clients and federation of an event.
+
+        Args:
+            event (FrozenEvent) the event to send.
+            context (Context) the context of the event.
+            ratelimit (bool): Whether to rate limit this send.
+            is_guest (bool): Whether the sender is a guest.
+        """
+        if event.type == EventTypes.Member:
+            raise SynapseError(
+                500,
+                "Tried to send member event through non-member codepath"
+            )
+
+        # We check here if we are currently being rate limited, so that we
+        # don't do unnecessary work. We check again just before we actually
+        # send the event.
+        yield self.base_handler.ratelimit(requester, update=False)
+
+        user = UserID.from_string(event.sender)
+
+        assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
+
+        if event.is_state():
+            prev_state = yield self.deduplicate_state_event(event, context)
+            if prev_state is not None:
+                defer.returnValue(prev_state)
+
+        yield self.handle_new_client_event(
+            requester=requester,
+            event=event,
+            context=context,
+            ratelimit=ratelimit,
+        )
+
+        if event.type == EventTypes.Message:
+            presence = self.hs.get_presence_handler()
+            # We don't want to block sending messages on any presence code. This
+            # matters as sometimes presence code can take a while.
+            preserve_fn(presence.bump_presence_active_time)(user)
+
+    @defer.inlineCallbacks
+    def deduplicate_state_event(self, event, context):
+        """
+        Checks whether event is in the latest resolved state in context.
+
+        If so, returns the version of the event in context.
+        Otherwise, returns None.
+        """
+        prev_event_id = context.prev_state_ids.get((event.type, event.state_key))
+        prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
+        if not prev_event:
+            return
+
+        if prev_event and event.user_id == prev_event.user_id:
+            prev_content = encode_canonical_json(prev_event.content)
+            next_content = encode_canonical_json(event.content)
+            if prev_content == next_content:
+                defer.returnValue(prev_event)
+        return
+
+    @defer.inlineCallbacks
+    def create_and_send_nonmember_event(
+        self,
+        requester,
+        event_dict,
+        ratelimit=True,
+        txn_id=None
+    ):
+        """
+        Creates an event, then sends it.
+
+        See self.create_event and self.send_nonmember_event.
+        """
+        event, context = yield self.create_event(
+            requester,
+            event_dict,
+            token_id=requester.access_token_id,
+            txn_id=txn_id
+        )
+
+        spam_error = self.spam_checker.check_event_for_spam(event)
+        if spam_error:
+            if not isinstance(spam_error, basestring):
+                spam_error = "Spam is not permitted here"
+            raise SynapseError(
+                403, spam_error, Codes.FORBIDDEN
+            )
+
+        yield self.send_nonmember_event(
+            requester,
+            event,
+            context,
+            ratelimit=ratelimit,
+        )
+        defer.returnValue(event)
+
+    @measure_func("create_new_client_event")
+    @defer.inlineCallbacks
+    def create_new_client_event(self, builder, requester=None, prev_event_ids=None):
         if prev_event_ids:
             prev_events = yield self.store.add_event_hashes(prev_event_ids)
             prev_max_depth = yield self.store.get_max_depth_of_events(prev_event_ids)
@@ -509,9 +525,7 @@ class MessageHandler(BaseHandler):
         builder.prev_events = prev_events
         builder.depth = depth
 
-        state_handler = self.state_handler
-
-        context = yield state_handler.compute_event_context(builder)
+        context = yield self.state.compute_event_context(builder)
         if requester:
             context.app_service = requester.app_service
 
@@ -551,7 +565,7 @@ class MessageHandler(BaseHandler):
         # We now need to go and hit out to wherever we need to hit out to.
 
         if ratelimit:
-            yield self.ratelimit(requester)
+            yield self.base_handler.ratelimit(requester)
 
         try:
             yield self.auth.check_from_context(event, context)
@@ -567,7 +581,7 @@ class MessageHandler(BaseHandler):
             logger.exception("Failed to encode content: %r", event.content)
             raise
 
-        yield self.maybe_kick_guest_users(event, context)
+        yield self.base_handler.maybe_kick_guest_users(event, context)
 
         if event.type == EventTypes.CanonicalAlias:
             # Check the alias is acually valid (at this time at least)
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index d1cc87a01..6ab020bf4 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014 - 2016 OpenMarket Ltd
+# 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.
@@ -64,6 +65,7 @@ class RoomCreationHandler(BaseHandler):
         super(RoomCreationHandler, self).__init__(hs)
 
         self.spam_checker = hs.get_spam_checker()
+        self.event_creation_handler = hs.get_event_creation_handler()
 
     @defer.inlineCallbacks
     def create_room(self, requester, config, ratelimit=True):
@@ -163,13 +165,11 @@ class RoomCreationHandler(BaseHandler):
 
         creation_content = config.get("creation_content", {})
 
-        msg_handler = self.hs.get_handlers().message_handler
         room_member_handler = self.hs.get_handlers().room_member_handler
 
         yield self._send_events_for_new_room(
             requester,
             room_id,
-            msg_handler,
             room_member_handler,
             preset_config=preset_config,
             invite_list=invite_list,
@@ -181,7 +181,7 @@ class RoomCreationHandler(BaseHandler):
 
         if "name" in config:
             name = config["name"]
-            yield msg_handler.create_and_send_nonmember_event(
+            yield self.event_creation_handler.create_and_send_nonmember_event(
                 requester,
                 {
                     "type": EventTypes.Name,
@@ -194,7 +194,7 @@ class RoomCreationHandler(BaseHandler):
 
         if "topic" in config:
             topic = config["topic"]
-            yield msg_handler.create_and_send_nonmember_event(
+            yield self.event_creation_handler.create_and_send_nonmember_event(
                 requester,
                 {
                     "type": EventTypes.Topic,
@@ -249,7 +249,6 @@ class RoomCreationHandler(BaseHandler):
             self,
             creator,  # A Requester object.
             room_id,
-            msg_handler,
             room_member_handler,
             preset_config,
             invite_list,
@@ -272,7 +271,7 @@ class RoomCreationHandler(BaseHandler):
         @defer.inlineCallbacks
         def send(etype, content, **kwargs):
             event = create(etype, content, **kwargs)
-            yield msg_handler.create_and_send_nonmember_event(
+            yield self.event_creation_handler.create_and_send_nonmember_event(
                 creator,
                 event,
                 ratelimit=False
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 7e6467cd1..37dc5e99a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2016 OpenMarket Ltd
+# 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.
@@ -46,6 +47,7 @@ class RoomMemberHandler(BaseHandler):
         super(RoomMemberHandler, self).__init__(hs)
 
         self.profile_handler = hs.get_profile_handler()
+        self.event_creation_hander = hs.get_event_creation_handler()
 
         self.member_linearizer = Linearizer(name="member")
 
@@ -66,13 +68,12 @@ class RoomMemberHandler(BaseHandler):
     ):
         if content is None:
             content = {}
-        msg_handler = self.hs.get_handlers().message_handler
 
         content["membership"] = membership
         if requester.is_guest:
             content["kind"] = "guest"
 
-        event, context = yield msg_handler.create_event(
+        event, context = yield self.event_creation_hander.create_event(
             requester,
             {
                 "type": EventTypes.Member,
@@ -90,12 +91,14 @@ class RoomMemberHandler(BaseHandler):
         )
 
         # Check if this event matches the previous membership event for the user.
-        duplicate = yield msg_handler.deduplicate_state_event(event, context)
+        duplicate = yield self.event_creation_hander.deduplicate_state_event(
+            event, context,
+        )
         if duplicate is not None:
             # Discard the new event since this membership change is a no-op.
             defer.returnValue(duplicate)
 
-        yield msg_handler.handle_new_client_event(
+        yield self.event_creation_hander.handle_new_client_event(
             requester,
             event,
             context,
@@ -394,8 +397,9 @@ class RoomMemberHandler(BaseHandler):
         else:
             requester = synapse.types.create_requester(target_user)
 
-        message_handler = self.hs.get_handlers().message_handler
-        prev_event = yield message_handler.deduplicate_state_event(event, context)
+        prev_event = yield self.event_creation_hander.deduplicate_state_event(
+            event, context,
+        )
         if prev_event is not None:
             return
 
@@ -412,7 +416,7 @@ class RoomMemberHandler(BaseHandler):
             if is_blocked:
                 raise SynapseError(403, "This room has been blocked on this server")
 
-        yield message_handler.handle_new_client_event(
+        yield self.event_creation_hander.handle_new_client_event(
             requester,
             event,
             context,
@@ -644,8 +648,7 @@ class RoomMemberHandler(BaseHandler):
             )
         )
 
-        msg_handler = self.hs.get_handlers().message_handler
-        yield msg_handler.create_and_send_nonmember_event(
+        yield self.event_creation_hander.create_and_send_nonmember_event(
             requester,
             {
                 "type": EventTypes.ThirdPartyInvite,
diff --git a/synapse/rest/client/v1/admin.py b/synapse/rest/client/v1/admin.py
index 0615e5d80..20c5c6663 100644
--- a/synapse/rest/client/v1/admin.py
+++ b/synapse/rest/client/v1/admin.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# 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.
@@ -171,6 +172,7 @@ class ShutdownRoomRestServlet(ClientV1RestServlet):
         self.store = hs.get_datastore()
         self.handlers = hs.get_handlers()
         self.state = hs.get_state_handler()
+        self.event_creation_handler = hs.get_event_creation_handler()
 
     @defer.inlineCallbacks
     def on_POST(self, request, room_id):
@@ -203,8 +205,7 @@ class ShutdownRoomRestServlet(ClientV1RestServlet):
         )
         new_room_id = info["room_id"]
 
-        msg_handler = self.handlers.message_handler
-        yield msg_handler.create_and_send_nonmember_event(
+        yield self.event_creation_handler.create_and_send_nonmember_event(
             room_creator_requester,
             {
                 "type": "m.room.message",
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 867ec8602..fbb2fc36e 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# 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.
@@ -82,6 +83,7 @@ class RoomStateEventRestServlet(ClientV1RestServlet):
     def __init__(self, hs):
         super(RoomStateEventRestServlet, self).__init__(hs)
         self.handlers = hs.get_handlers()
+        self.event_creation_hander = hs.get_event_creation_handler()
 
     def register(self, http_server):
         # /room/$roomid/state/$eventtype
@@ -162,15 +164,16 @@ class RoomStateEventRestServlet(ClientV1RestServlet):
                 content=content,
             )
         else:
-            msg_handler = self.handlers.message_handler
-            event, context = yield msg_handler.create_event(
+            event, context = yield self.event_creation_hander.create_event(
                 requester,
                 event_dict,
                 token_id=requester.access_token_id,
                 txn_id=txn_id,
             )
 
-            yield msg_handler.send_nonmember_event(requester, event, context)
+            yield self.event_creation_hander.send_nonmember_event(
+                requester, event, context,
+            )
 
         ret = {}
         if event:
@@ -184,6 +187,7 @@ class RoomSendEventRestServlet(ClientV1RestServlet):
     def __init__(self, hs):
         super(RoomSendEventRestServlet, self).__init__(hs)
         self.handlers = hs.get_handlers()
+        self.event_creation_hander = hs.get_event_creation_handler()
 
     def register(self, http_server):
         # /rooms/$roomid/send/$event_type[/$txn_id]
@@ -205,8 +209,7 @@ class RoomSendEventRestServlet(ClientV1RestServlet):
         if 'ts' in request.args and requester.app_service:
             event_dict['origin_server_ts'] = parse_integer(request, "ts", 0)
 
-        msg_handler = self.handlers.message_handler
-        event = yield msg_handler.create_and_send_nonmember_event(
+        event = yield self.event_creation_hander.create_and_send_nonmember_event(
             requester,
             event_dict,
             txn_id=txn_id,
@@ -670,6 +673,7 @@ class RoomRedactEventRestServlet(ClientV1RestServlet):
     def __init__(self, hs):
         super(RoomRedactEventRestServlet, self).__init__(hs)
         self.handlers = hs.get_handlers()
+        self.event_creation_handler = hs.get_event_creation_handler()
 
     def register(self, http_server):
         PATTERNS = ("/rooms/(?P<room_id>[^/]*)/redact/(?P<event_id>[^/]*)")
@@ -680,8 +684,7 @@ class RoomRedactEventRestServlet(ClientV1RestServlet):
         requester = yield self.auth.get_user_by_req(request)
         content = parse_json_object_from_request(request)
 
-        msg_handler = self.handlers.message_handler
-        event = yield msg_handler.create_and_send_nonmember_event(
+        event = yield self.event_creation_handler.create_and_send_nonmember_event(
             requester,
             {
                 "type": EventTypes.Redaction,
diff --git a/synapse/server.py b/synapse/server.py
index 3173aed1d..fbd602d40 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -55,6 +55,7 @@ from synapse.handlers.read_marker import ReadMarkerHandler
 from synapse.handlers.user_directory import UserDirectoryHandler
 from synapse.handlers.groups_local import GroupsLocalHandler
 from synapse.handlers.profile import ProfileHandler
+from synapse.handlers.message import EventCreationHandler
 from synapse.groups.groups_server import GroupsServerHandler
 from synapse.groups.attestations import GroupAttestionRenewer, GroupAttestationSigning
 from synapse.http.client import SimpleHttpClient, InsecureInterceptableContextFactory
@@ -118,6 +119,7 @@ class HomeServer(object):
         'application_service_handler',
         'device_message_handler',
         'profile_handler',
+        'event_creation_handler',
         'deactivate_account_handler',
         'set_password_handler',
         'notifier',
@@ -276,6 +278,9 @@ class HomeServer(object):
     def build_profile_handler(self):
         return ProfileHandler(self)
 
+    def build_event_creation_handler(self):
+        return EventCreationHandler(self)
+
     def build_deactivate_account_handler(self):
         return DeactivateAccountHandler(self)
 
diff --git a/tests/storage/test_redaction.py b/tests/storage/test_redaction.py
index 6afaca3a6..888ddfadd 100644
--- a/tests/storage/test_redaction.py
+++ b/tests/storage/test_redaction.py
@@ -36,8 +36,7 @@ class RedactionTestCase(unittest.TestCase):
 
         self.store = hs.get_datastore()
         self.event_builder_factory = hs.get_event_builder_factory()
-        self.handlers = hs.get_handlers()
-        self.message_handler = self.handlers.message_handler
+        self.event_creation_handler = hs.get_event_creation_handler()
 
         self.u_alice = UserID.from_string("@alice:test")
         self.u_bob = UserID.from_string("@bob:test")
@@ -59,7 +58,7 @@ class RedactionTestCase(unittest.TestCase):
             "content": content,
         })
 
-        event, context = yield self.message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder
         )
 
@@ -79,7 +78,7 @@ class RedactionTestCase(unittest.TestCase):
             "content": {"body": body, "msgtype": u"message"},
         })
 
-        event, context = yield self.message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder
         )
 
@@ -98,7 +97,7 @@ class RedactionTestCase(unittest.TestCase):
             "redacts": event_id,
         })
 
-        event, context = yield self.message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder
         )
 
diff --git a/tests/storage/test_roommember.py b/tests/storage/test_roommember.py
index 1be7d932f..657b279e5 100644
--- a/tests/storage/test_roommember.py
+++ b/tests/storage/test_roommember.py
@@ -37,8 +37,7 @@ class RoomMemberStoreTestCase(unittest.TestCase):
         # storage logic
         self.store = hs.get_datastore()
         self.event_builder_factory = hs.get_event_builder_factory()
-        self.handlers = hs.get_handlers()
-        self.message_handler = self.handlers.message_handler
+        self.event_creation_handler = hs.get_event_creation_handler()
 
         self.u_alice = UserID.from_string("@alice:test")
         self.u_bob = UserID.from_string("@bob:test")
@@ -58,7 +57,7 @@ class RoomMemberStoreTestCase(unittest.TestCase):
             "content": {"membership": membership},
         })
 
-        event, context = yield self.message_handler._create_new_client_event(
+        event, context = yield self.event_creation_handler.create_new_client_event(
             builder
         )