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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 href="upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded "><a href="MSC1711_certificates_FAQ.html">Upgrading from pre-Synapse 1.0</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/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 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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="admin_api/delete_group.html">Delete Group</a></li><li class="chapter-item expanded "><a href="admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="admin_api/purge_room.html">Purge Rooms</a></li><li class="chapter-item expanded "><a href="admin_api/register_api.html">Register Users</a></li><li 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"><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/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></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 Schemas</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li 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<h1 class="menu-title">Synapse</h1>
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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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<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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<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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<p>Also note that we are currently in the process of migrating module interfaces to this
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system. While some interfaces might be compatible with it, others still require
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configuring modules in another part of Synapse's configuration file. Currently, only the
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spam checker interface is compatible with this new system.</p>
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<h2 id="writing-a-module"><a class="header" href="#writing-a-module">Writing a module</a></h2>
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<p>A module is a Python class that uses Synapse's module API to interact with the
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homeserver. It can register callbacks that Synapse will call on specific operations, as
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well as web resources to attach to Synapse's web server.</p>
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<p>When instantiated, a module is given its parsed configuration as well as an instance of
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the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dictionary, and is
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either the output of the module's <code>parse_config</code> static method (see below), or the
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configuration associated with the module in Synapse's configuration file.</p>
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<p>See the documentation for the <code>ModuleApi</code> class
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<a href="https://github.com/matrix-org/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
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<h3 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h3>
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<p>A module can implement the following static method:</p>
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<pre><code class="language-python">@staticmethod
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def parse_config(config: dict) -> dict
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</code></pre>
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<p>This method is given a dictionary resulting from parsing the YAML configuration for the
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module. It may modify it (for example by parsing durations expressed as strings (e.g.
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"5d") into milliseconds, etc.), and return the modified dictionary. It may also verify
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that the configuration is correct, and raise an instance of
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<code>synapse.module_api.errors.ConfigError</code> if not.</p>
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<h3 id="registering-a-web-resource"><a class="header" href="#registering-a-web-resource">Registering a web resource</a></h3>
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<p>Modules can register web resources onto Synapse's web server using the following module
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API method:</p>
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<pre><code class="language-python">def ModuleApi.register_web_resource(path: str, resource: IResource) -> None
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</code></pre>
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<p>The path is the full absolute path to register the resource at. For example, if you
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register a resource for the path <code>/_synapse/client/my_super_module/say_hello</code>, Synapse
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will serve it at <code>http(s)://[HS_URL]/_synapse/client/my_super_module/say_hello</code>. Note
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that Synapse does not allow registering resources for several sub-paths in the <code>/_matrix</code>
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namespace (such as anything under <code>/_matrix/client</code> for example). It is strongly
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recommended that modules register their web resources under the <code>/_synapse/client</code>
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namespace.</p>
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<p>The provided resource is a Python class that implements Twisted's <a href="https://twistedmatrix.com/documents/current/api/twisted.web.resource.IResource.html">IResource</a>
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interface (such as <a href="https://twistedmatrix.com/documents/current/api/twisted.web.resource.Resource.html">Resource</a>).</p>
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<p>Only one resource can be registered for a given path. If several modules attempt to
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register a resource for the same path, the module that appears first in Synapse's
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configuration file takes priority.</p>
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<p>Modules <strong>must</strong> register their web resources in their <code>__init__</code> method.</p>
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<h3 id="registering-a-callback"><a class="header" href="#registering-a-callback">Registering a callback</a></h3>
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<p>Modules can use Synapse's module API to register callbacks. Callbacks are functions that
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Synapse will call when performing specific actions. Callbacks must be asynchronous, and
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are split in categories. A single module may implement callbacks from multiple categories,
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and is under no obligation to implement all callbacks from the categories it registers
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callbacks for.</p>
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<p>Modules can register callbacks using one of the module API's <code>register_[...]_callbacks</code>
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methods. The callback functions are passed to these methods as keyword arguments, with
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the callback name as the argument name and the function as its value. This is demonstrated
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in the example below. A <code>register_[...]_callbacks</code> method exists for each module type
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documented in this section.</p>
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<h4 id="spam-checker-callbacks"><a class="header" href="#spam-checker-callbacks">Spam checker callbacks</a></h4>
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<p>Spam checker callbacks allow module developers to implement spam mitigation actions for
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Synapse instances. Spam checker callbacks can be registered using the module API's
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<code>register_spam_checker_callbacks</code> method.</p>
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<p>The available spam checker callbacks are:</p>
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<pre><code class="language-python">async def check_event_for_spam(event: "synapse.events.EventBase") -> Union[bool, str]
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</code></pre>
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<p>Called when receiving an event from a client or via federation. The module can return
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either a <code>bool</code> to indicate whether the event must be rejected because of spam, or a <code>str</code>
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to indicate the event must be rejected because of spam and to give a rejection reason to
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forward to clients.</p>
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<pre><code class="language-python">async def user_may_invite(inviter: str, invitee: str, room_id: str) -> bool
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</code></pre>
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<p>Called when processing an invitation. The module must return a <code>bool</code> indicating whether
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the inviter can invite the invitee to the given room. Both inviter and invitee are
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represented by their Matrix user ID (e.g. <code>@alice:example.com</code>).</p>
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<pre><code class="language-python">async def user_may_create_room(user: str) -> bool
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</code></pre>
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<p>Called when processing a room creation request. The module must return a <code>bool</code> indicating
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whether the given user (represented by their Matrix user ID) is allowed to create a room.</p>
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<pre><code class="language-python">async def user_may_create_room_alias(user: str, room_alias: "synapse.types.RoomAlias") -> bool
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</code></pre>
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<p>Called when trying to associate an alias with an existing room. The module must return a
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<code>bool</code> indicating whether the given user (represented by their Matrix user ID) is allowed
|
|
to set the given alias.</p>
|
|
<pre><code class="language-python">async def user_may_publish_room(user: str, room_id: str) -> bool
|
|
</code></pre>
|
|
<p>Called when trying to publish a room to the homeserver's public rooms directory. The
|
|
module must return a <code>bool</code> indicating whether the given user (represented by their
|
|
Matrix user ID) is allowed to publish the given room.</p>
|
|
<pre><code class="language-python">async def check_username_for_spam(user_profile: Dict[str, str]) -> bool
|
|
</code></pre>
|
|
<p>Called when computing search results in the user directory. The module must return a
|
|
<code>bool</code> indicating whether the given user profile can appear in search results. The profile
|
|
is represented as a dictionary with the following keys:</p>
|
|
<ul>
|
|
<li><code>user_id</code>: The Matrix ID for this user.</li>
|
|
<li><code>display_name</code>: The user's display name.</li>
|
|
<li><code>avatar_url</code>: The <code>mxc://</code> URL to the user's avatar.</li>
|
|
</ul>
|
|
<p>The module is given a copy of the original dictionary, so modifying it from within the
|
|
module cannot modify a user's profile when included in user directory search results.</p>
|
|
<pre><code class="language-python">async def check_registration_for_spam(
|
|
email_threepid: Optional[dict],
|
|
username: Optional[str],
|
|
request_info: Collection[Tuple[str, str]],
|
|
auth_provider_id: Optional[str] = None,
|
|
) -> "synapse.spam_checker_api.RegistrationBehaviour"
|
|
</code></pre>
|
|
<p>Called when registering a new user. The module must return a <code>RegistrationBehaviour</code>
|
|
indicating whether the registration can go through or must be denied, or whether the user
|
|
may be allowed to register but will be shadow banned.</p>
|
|
<p>The arguments passed to this callback are:</p>
|
|
<ul>
|
|
<li><code>email_threepid</code>: The email address used for registering, if any.</li>
|
|
<li><code>username</code>: The username the user would like to register. Can be <code>None</code>, meaning that
|
|
Synapse will generate one later.</li>
|
|
<li><code>request_info</code>: A collection of tuples, which first item is a user agent, and which
|
|
second item is an IP address. These user agents and IP addresses are the ones that were
|
|
used during the registration process.</li>
|
|
<li><code>auth_provider_id</code>: The identifier of the SSO authentication provider, if any.</li>
|
|
</ul>
|
|
<pre><code class="language-python">async def check_media_file_for_spam(
|
|
file_wrapper: "synapse.rest.media.v1.media_storage.ReadableFileWrapper",
|
|
file_info: "synapse.rest.media.v1._base.FileInfo",
|
|
) -> bool
|
|
</code></pre>
|
|
<p>Called when storing a local or remote file. The module must return a boolean indicating
|
|
whether the given file can be stored in the homeserver's media store.</p>
|
|
<h4 id="account-validity-callbacks"><a class="header" href="#account-validity-callbacks">Account validity callbacks</a></h4>
|
|
<p>Account validity callbacks allow module developers to add extra steps to verify the
|
|
validity on an account, i.e. see if a user can be granted access to their account on the
|
|
Synapse instance. Account validity callbacks can be registered using the module API's
|
|
<code>register_account_validity_callbacks</code> method.</p>
|
|
<p>The available account validity callbacks are:</p>
|
|
<pre><code class="language-python">async def is_user_expired(user: str) -> Optional[bool]
|
|
</code></pre>
|
|
<p>Called when processing any authenticated request (except for logout requests). The module
|
|
can return a <code>bool</code> to indicate whether the user has expired and should be locked out of
|
|
their account, or <code>None</code> if the module wasn't able to figure it out. The user is
|
|
represented by their Matrix user ID (e.g. <code>@alice:example.com</code>).</p>
|
|
<p>If the module returns <code>True</code>, the current request will be denied with the error code
|
|
<code>ORG_MATRIX_EXPIRED_ACCOUNT</code> and the HTTP status code 403. Note that this doesn't
|
|
invalidate the user's access token.</p>
|
|
<pre><code class="language-python">async def on_user_registration(user: str) -> None
|
|
</code></pre>
|
|
<p>Called after successfully registering a user, in case the module needs to perform extra
|
|
operations to keep track of them. (e.g. add them to a database table). The user is
|
|
represented by their Matrix user ID.</p>
|
|
<h4 id="third-party-rules-callbacks"><a class="header" href="#third-party-rules-callbacks">Third party rules callbacks</a></h4>
|
|
<p>Third party rules callbacks allow module developers to add extra checks to verify the
|
|
validity of incoming events. Third party event rules callbacks can be registered using
|
|
the module API's <code>register_third_party_rules_callbacks</code> method.</p>
|
|
<p>The available third party rules callbacks are:</p>
|
|
<pre><code class="language-python">async def check_event_allowed(
|
|
event: "synapse.events.EventBase",
|
|
state_events: "synapse.types.StateMap",
|
|
) -> Tuple[bool, Optional[dict]]
|
|
</code></pre>
|
|
<p><strong><span style="color:red">
|
|
This callback is very experimental and can and will break without notice. Module developers
|
|
are encouraged to implement <code>check_event_for_spam</code> from the spam checker category instead.
|
|
</span></strong></p>
|
|
<p>Called when processing any incoming event, with the event and a <code>StateMap</code>
|
|
representing the current state of the room the event is being sent into. A <code>StateMap</code> is
|
|
a dictionary that maps tuples containing an event type and a state key to the
|
|
corresponding state event. For example retrieving the room's <code>m.room.create</code> event from
|
|
the <code>state_events</code> argument would look like this: <code>state_events.get(("m.room.create", ""))</code>.
|
|
The module must return a boolean indicating whether the event can be allowed.</p>
|
|
<p>Note that this callback function processes incoming events coming via federation
|
|
traffic (on top of client traffic). This means denying an event might cause the local
|
|
copy of the room's history to diverge from that of remote servers. This may cause
|
|
federation issues in the room. It is strongly recommended to only deny events using this
|
|
callback function if the sender is a local user, or in a private federation in which all
|
|
servers are using the same module, with the same configuration.</p>
|
|
<p>If the boolean returned by the module is <code>True</code>, it may also tell Synapse to replace the
|
|
event with new data by returning the new event's data as a dictionary. In order to do
|
|
that, it is recommended the module calls <code>event.get_dict()</code> to get the current event as a
|
|
dictionary, and modify the returned dictionary accordingly.</p>
|
|
<p>Note that replacing the event only works for events sent by local users, not for events
|
|
received over federation.</p>
|
|
<pre><code class="language-python">async def on_create_room(
|
|
requester: "synapse.types.Requester",
|
|
request_content: dict,
|
|
is_requester_admin: bool,
|
|
) -> None
|
|
</code></pre>
|
|
<p>Called when processing a room creation request, with the <code>Requester</code> object for the user
|
|
performing the request, a dictionary representing the room creation request's JSON body
|
|
(see <a href="https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-createroom">the spec</a>
|
|
for a list of possible parameters), and a boolean indicating whether the user performing
|
|
the request is a server admin.</p>
|
|
<p>Modules can modify the <code>request_content</code> (by e.g. adding events to its <code>initial_state</code>),
|
|
or deny the room's creation by raising a <code>module_api.errors.SynapseError</code>.</p>
|
|
<h3 id="porting-an-existing-module-that-uses-the-old-interface"><a class="header" href="#porting-an-existing-module-that-uses-the-old-interface">Porting an existing module that uses the old interface</a></h3>
|
|
<p>In order to port a module that uses Synapse's old module interface, its author needs to:</p>
|
|
<ul>
|
|
<li>ensure the module's callbacks are all asynchronous.</li>
|
|
<li>register their callbacks using one or more of the <code>register_[...]_callbacks</code> methods
|
|
from the <code>ModuleApi</code> class in the module's <code>__init__</code> method (see <a href="#registering-a-callback">this section</a>
|
|
for more info).</li>
|
|
</ul>
|
|
<p>Additionally, if the module is packaged with an additional web resource, the module
|
|
should register this resource in its <code>__init__</code> method using the <code>register_web_resource</code>
|
|
method from the <code>ModuleApi</code> class (see <a href="#registering-a-web-resource">this section</a> for
|
|
more info).</p>
|
|
<p>The module's author should also update any example in the module's configuration to only
|
|
use the new <code>modules</code> section in Synapse's configuration file (see <a href="#using-modules">this section</a>
|
|
for more info).</p>
|
|
<h3 id="example"><a class="header" href="#example">Example</a></h3>
|
|
<p>The example below is a module that implements the spam checker callback
|
|
<code>user_may_create_room</code> to deny room creation to user <code>@evilguy:example.com</code>, and registers
|
|
a web resource to the path <code>/_synapse/client/demo/hello</code> that returns a JSON object.</p>
|
|
<pre><code class="language-python">import json
|
|
|
|
from twisted.web.resource import Resource
|
|
from twisted.web.server import Request
|
|
|
|
from synapse.module_api import ModuleApi
|
|
|
|
|
|
class DemoResource(Resource):
|
|
def __init__(self, config):
|
|
super(DemoResource, self).__init__()
|
|
self.config = config
|
|
|
|
def render_GET(self, request: Request):
|
|
name = request.args.get(b"name")[0]
|
|
request.setHeader(b"Content-Type", b"application/json")
|
|
return json.dumps({"hello": name})
|
|
|
|
|
|
class DemoModule:
|
|
def __init__(self, config: dict, api: ModuleApi):
|
|
self.config = config
|
|
self.api = api
|
|
|
|
self.api.register_web_resource(
|
|
path="/_synapse/client/demo/hello",
|
|
resource=DemoResource(self.config),
|
|
)
|
|
|
|
self.api.register_spam_checker_callbacks(
|
|
user_may_create_room=self.user_may_create_room,
|
|
)
|
|
|
|
@staticmethod
|
|
def parse_config(config):
|
|
return config
|
|
|
|
async def user_may_create_room(self, user: str) -> bool:
|
|
if user == "@evilguy:example.com":
|
|
return False
|
|
|
|
return True
|
|
</code></pre>
|
|
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|
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