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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a 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href="../usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="../CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="../application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="../server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="../development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="../user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="../message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="../modules/index.html" class="active">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a href="../modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="../modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="../modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="../modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="../modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="../modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="../modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="../systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item expanded "><a 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format</a></li><li class="chapter-item expanded "><a href="../usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="../development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="../opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="../development/database_schema.html">Database 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<h1 id="modules"><a class="header" href="#modules">Modules</a></h1>
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<p>Synapse supports extending its functionality by configuring external modules.</p>
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<p><strong>Note</strong>: When using third-party modules, you effectively allow someone else to run
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custom code on your Synapse homeserver. Server admins are encouraged to verify the
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provenance of the modules they use on their homeserver and make sure the modules aren't
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running malicious code on their instance.</p>
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<h2 id="using-modules"><a class="header" href="#using-modules">Using modules</a></h2>
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<p>To use a module on Synapse, add it to the <code>modules</code> section of the configuration file:</p>
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<pre><code class="language-yaml">modules:
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- module: my_super_module.MySuperClass
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config:
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do_thing: true
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- module: my_other_super_module.SomeClass
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config: {}
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</code></pre>
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<p>Each module is defined by a path to a Python class as well as a configuration. This
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information for a given module should be available in the module's own documentation.</p>
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<h2 id="using-multiple-modules"><a class="header" href="#using-multiple-modules">Using multiple modules</a></h2>
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<p>The order in which modules are listed in this section is important. When processing an
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action that can be handled by several modules, Synapse will always prioritise the module
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that appears first (i.e. is the highest in the list). This means:</p>
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<ul>
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<li>If several modules register the same callback, the callback registered by the module
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that appears first is used.</li>
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<li>If several modules try to register a handler for the same HTTP path, only the handler
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registered by the module that appears first is used. Handlers registered by the other
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module(s) are ignored and Synapse will log a warning message about them.</li>
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</ul>
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<p>Note that Synapse doesn't allow multiple modules implementing authentication checkers via
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the password auth provider feature for the same login type with different fields. If this
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happens, Synapse will refuse to start.</p>
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<h2 id="current-status"><a class="header" href="#current-status">Current status</a></h2>
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<p>We are currently in the process of migrating module interfaces to this system. While some
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interfaces might be compatible with it, others still require configuring modules in
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another part of Synapse's configuration file.</p>
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<p>Currently, only the following pre-existing interfaces are compatible with this new system:</p>
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<ul>
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<li>spam checker</li>
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<li>third-party rules</li>
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<li>presence router</li>
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<li>password auth providers</li>
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</ul>
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