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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><ol class="section"><li class="chapter-item expanded "><a href="../setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="../setup/turn/eturnal.html">eturnal TURN server</a></li></ol></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 href="../upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="../federate.html">Federation</a></li><li class="chapter-item expanded "><a href="../usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../usage/configuration/config_documentation.html">Configuration Manual</a></li><li class="chapter-item expanded "><a href="../usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="../usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="../structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="../templates.html">Templates</a></li><li class="chapter-item expanded "><a href="../usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="../usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></li><li class="chapter-item expanded "><a href="../sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="../password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="../jwt.html">JSON Web Tokens</a></li><li class="chapter-item expanded "><a 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="../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-
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<main>
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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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</main>
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