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                        <p><strong>Note: this page of the Synapse documentation is now deprecated. For up to date
documentation on setting up or writing a spam checker module, please see
<a href="https://matrix-org.github.io/synapse/develop/modules.html">this page</a>.</strong></p>
<h1 id="handling-spam-in-synapse"><a class="header" href="#handling-spam-in-synapse">Handling spam in Synapse</a></h1>
<p>Synapse has support to customize spam checking behavior. It can plug into a
variety of events and affect how they are presented to users on your homeserver.</p>
<p>The spam checking behavior is implemented as a Python class, which must be
able to be imported by the running Synapse.</p>
<h2 id="python-spam-checker-class"><a class="header" href="#python-spam-checker-class">Python spam checker class</a></h2>
<p>The Python class is instantiated with two objects:</p>
<ul>
<li>Any configuration (see below).</li>
<li>An instance of <code>synapse.module_api.ModuleApi</code>.</li>
</ul>
<p>It then implements methods which return a boolean to alter behavior in Synapse.
All the methods must be defined.</p>
<p>There's a generic method for checking every event (<code>check_event_for_spam</code>), as
well as some specific methods:</p>
<ul>
<li><code>user_may_invite</code></li>
<li><code>user_may_create_room</code></li>
<li><code>user_may_create_room_alias</code></li>
<li><code>user_may_publish_room</code></li>
<li><code>check_username_for_spam</code></li>
<li><code>check_registration_for_spam</code></li>
<li><code>check_media_file_for_spam</code></li>
</ul>
<p>The details of each of these methods (as well as their inputs and outputs)
are documented in the <code>synapse.events.spamcheck.SpamChecker</code> class.</p>
<p>The <code>ModuleApi</code> class provides a way for the custom spam checker class to
call back into the homeserver internals.</p>
<p>Additionally, a <code>parse_config</code> method is mandatory and receives the plugin config
dictionary. After parsing, It must return an object which will be
passed to <code>__init__</code> later.</p>
<h3 id="example"><a class="header" href="#example">Example</a></h3>
<pre><code class="language-python">from synapse.spam_checker_api import RegistrationBehaviour

class ExampleSpamChecker:
    def __init__(self, config, api):
        self.config = config
        self.api = api

    @staticmethod
    def parse_config(config):
        return config
        
    async def check_event_for_spam(self, foo):
        return False  # allow all events

    async def user_may_invite(self, inviter_userid, invitee_userid, room_id):
        return True  # allow all invites

    async def user_may_create_room(self, userid):
        return True  # allow all room creations

    async def user_may_create_room_alias(self, userid, room_alias):
        return True  # allow all room aliases

    async def user_may_publish_room(self, userid, room_id):
        return True  # allow publishing of all rooms

    async def check_username_for_spam(self, user_profile):
        return False  # allow all usernames

    async def check_registration_for_spam(
        self,
        email_threepid,
        username,
        request_info,
        auth_provider_id,
    ):
        return RegistrationBehaviour.ALLOW  # allow all registrations

    async def check_media_file_for_spam(self, file_wrapper, file_info):
        return False  # allow all media
</code></pre>
<h2 id="configuration"><a class="header" href="#configuration">Configuration</a></h2>
<p>Modify the <code>spam_checker</code> section of your <code>homeserver.yaml</code> in the following
manner:</p>
<p>Create a list entry with the keys <code>module</code> and <code>config</code>.</p>
<ul>
<li>
<p><code>module</code> should point to the fully qualified Python class that implements your
custom logic, e.g. <code>my_module.ExampleSpamChecker</code>.</p>
</li>
<li>
<p><code>config</code> is a dictionary that gets passed to the spam checker class.</p>
</li>
</ul>
<h3 id="example-1"><a class="header" href="#example-1">Example</a></h3>
<p>This section might look like:</p>
<pre><code class="language-yaml">spam_checker:
  - module: my_module.ExampleSpamChecker
    config:
      # Enable or disable a specific option in ExampleSpamChecker.
      my_custom_option: true
</code></pre>
<p>More spam checkers can be added in tandem by appending more items to the list. An
action is blocked when at least one of the configured spam checkers flags it.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<p>The <a href="https://github.com/matrix-org/mjolnir">Mjolnir</a> project is a full fledged
example using the Synapse spam checking API, including a bot for dynamic
configuration.</p>

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