diff --git a/synapse/events/spamcheck.py b/synapse/events/spamcheck.py
new file mode 100644
index 0000000000..633e068eb8
--- /dev/null
+++ b/synapse/events/spamcheck.py
@@ -0,0 +1,113 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 New Vector Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+class SpamChecker(object):
+ def __init__(self, hs):
+ self.spam_checker = None
+
+ module = None
+ config = None
+ try:
+ module, config = hs.config.spam_checker
+ except Exception:
+ pass
+
+ if module is not None:
+ self.spam_checker = module(config=config)
+
+ def check_event_for_spam(self, event):
+ """Checks if a given event is considered "spammy" by this server.
+
+ If the server considers an event spammy, then it will be rejected if
+ sent by a local user. If it is sent by a user on another server, then
+ users receive a blank event.
+
+ Args:
+ event (synapse.events.EventBase): the event to be checked
+
+ Returns:
+ bool: True if the event is spammy.
+ """
+ if self.spam_checker is None:
+ return False
+
+ return self.spam_checker.check_event_for_spam(event)
+
+ def user_may_invite(self, inviter_userid, invitee_userid, room_id):
+ """Checks if a given user may send an invite
+
+ If this method returns false, the invite will be rejected.
+
+ Args:
+ userid (string): The sender's user ID
+
+ Returns:
+ bool: True if the user may send an invite, otherwise False
+ """
+ if self.spam_checker is None:
+ return True
+
+ return self.spam_checker.user_may_invite(inviter_userid, invitee_userid, room_id)
+
+ def user_may_create_room(self, userid):
+ """Checks if a given user may create a room
+
+ If this method returns false, the creation request will be rejected.
+
+ Args:
+ userid (string): The sender's user ID
+
+ Returns:
+ bool: True if the user may create a room, otherwise False
+ """
+ if self.spam_checker is None:
+ return True
+
+ return self.spam_checker.user_may_create_room(userid)
+
+ def user_may_create_room_alias(self, userid, room_alias):
+ """Checks if a given user may create a room alias
+
+ If this method returns false, the association request will be rejected.
+
+ Args:
+ userid (string): The sender's user ID
+ room_alias (string): The alias to be created
+
+ Returns:
+ bool: True if the user may create a room alias, otherwise False
+ """
+ if self.spam_checker is None:
+ return True
+
+ return self.spam_checker.user_may_create_room_alias(userid, room_alias)
+
+ def user_may_publish_room(self, userid, room_id):
+ """Checks if a given user may publish a room to the directory
+
+ If this method returns false, the publish request will be rejected.
+
+ Args:
+ userid (string): The sender's user ID
+ room_id (string): The ID of the room that would be published
+
+ Returns:
+ bool: True if the user may publish the room, otherwise False
+ """
+ if self.spam_checker is None:
+ return True
+
+ return self.spam_checker.user_may_publish_room(userid, room_id)
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