1 files changed, 47 insertions, 0 deletions
diff --git a/synapse/events/spamcheck.py b/synapse/events/spamcheck.py
new file mode 100644
index 0000000000..e739f105b2
--- /dev/null
+++ b/synapse/events/spamcheck.py
@@ -0,0 +1,47 @@
+# -*- 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:
+            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)