deploy: 9be5aacc2d901f553ec972d0d62738bd42c87037

author: reivilibre <reivilibre@users.noreply.github.com> 2022-01-05 12:40:23 +0000
committer: reivilibre <reivilibre@users.noreply.github.com> 2022-01-05 12:40:23 +0000
commit: 405951e9c57c59b63bcdcefdc356dbd2bc50174a (patch)
tree: a6adfeb1516eaa5169da8cc709f1475b8d8b04da /v1.50/modules
parent: deploy: eedb4527f1524fc3b83cd4838774b04d6f1e3911 (diff)
download: synapse-405951e9c57c59b63bcdcefdc356dbd2bc50174a.tar.xz
9 files changed, 3070 insertions, 0 deletions
diff --git a/v1.50/modules/account_validity_callbacks.html b/v1.50/modules/account_validity_callbacks.html
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+                        <h1 id="account-validity-callbacks"><a class="header" href="#account-validity-callbacks">Account validity callbacks</a></h1>
+<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>
+<h3 id="is_user_expired"><a class="header" href="#is_user_expired"><code>is_user_expired</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def is_user_expired(user: str) -&gt; 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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>None</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>None</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="on_user_registration"><a class="header" href="#on_user_registration"><code>on_user_registration</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def on_user_registration(user: str) -&gt; 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>
+<p>If multiple modules implement this callback, Synapse runs them all in order.</p>
+
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diff --git a/v1.50/modules/background_update_controller_callbacks.html b/v1.50/modules/background_update_controller_callbacks.html
new file mode 100644
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+                        <h1 id="background-update-controller-callbacks"><a class="header" href="#background-update-controller-callbacks">Background update controller callbacks</a></h1>
+<p>Background update controller callbacks allow module developers to control (e.g. rate-limit)
+how database background updates are run. A database background update is an operation
+Synapse runs on its database in the background after it starts. It's usually used to run
+database operations that would take too long if they were run at the same time as schema
+updates (which are run on startup) and delay Synapse's startup too much: populating a
+table with a big amount of data, adding an index on a big table, deleting superfluous data,
+etc.</p>
+<p>Background update controller callbacks can be registered using the module API's
+<code>register_background_update_controller_callbacks</code> method. Only the first module (in order
+of appearance in Synapse's configuration file) calling this method can register background
+update controller callbacks, subsequent calls are ignored.</p>
+<p>The available background update controller callbacks are:</p>
+<h3 id="on_update"><a class="header" href="#on_update"><code>on_update</code></a></h3>
+<p><em>First introduced in Synapse v1.49.0</em></p>
+<pre><code class="language-python">def on_update(update_name: str, database_name: str, one_shot: bool) -&gt; AsyncContextManager[int]
+</code></pre>
+<p>Called when about to do an iteration of a background update. The module is given the name
+of the update, the name of the database, and a flag to indicate whether the background
+update will happen in one go and may take a long time (e.g. creating indices). If this last
+argument is set to <code>False</code>, the update will be run in batches.</p>
+<p>The module must return an async context manager. It will be entered before Synapse runs a 
+background update; this should return the desired duration of the iteration, in
+milliseconds.</p>
+<p>The context manager will be exited when the iteration completes. Note that the duration
+returned by the context manager is a target, and an iteration may take substantially longer
+or shorter. If the <code>one_shot</code> flag is set to <code>True</code>, the duration returned is ignored.</p>
+<p><strong>Note</strong>: Unlike most module callbacks in Synapse, this one is <em>synchronous</em>. This is
+because asynchronous operations are expected to be run by the async context manager.</p>
+<p>This callback is required when registering any other background update controller callback.</p>
+<h3 id="default_batch_size"><a class="header" href="#default_batch_size"><code>default_batch_size</code></a></h3>
+<p><em>First introduced in Synapse v1.49.0</em></p>
+<pre><code class="language-python">async def default_batch_size(update_name: str, database_name: str) -&gt; int
+</code></pre>
+<p>Called before the first iteration of a background update, with the name of the update and
+of the database. The module must return the number of elements to process in this first
+iteration.</p>
+<p>If this callback is not defined, Synapse will use a default value of 100.</p>
+<h3 id="min_batch_size"><a class="header" href="#min_batch_size"><code>min_batch_size</code></a></h3>
+<p><em>First introduced in Synapse v1.49.0</em></p>
+<pre><code class="language-python">async def min_batch_size(update_name: str, database_name: str) -&gt; int
+</code></pre>
+<p>Called before running a new batch for a background update, with the name of the update and
+of the database. The module must return an integer representing the minimum number of
+elements to process in this iteration. This number must be at least 1, and is used to
+ensure that progress is always made.</p>
+<p>If this callback is not defined, Synapse will use a default value of 100.</p>
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+
+                        <h1 id="modules"><a class="header" href="#modules">Modules</a></h1>
+<p>Synapse supports extending its functionality by configuring external modules.</p>
+<p><strong>Note</strong>: When using third-party modules, you effectively allow someone else to run
+custom code on your Synapse homeserver. Server admins are encouraged to verify the
+provenance of the modules they use on their homeserver and make sure the modules aren't
+running malicious code on their instance.</p>
+<h2 id="using-modules"><a class="header" href="#using-modules">Using modules</a></h2>
+<p>To use a module on Synapse, add it to the <code>modules</code> section of the configuration file:</p>
+<pre><code class="language-yaml">modules:
+  - module: my_super_module.MySuperClass
+    config:
+      do_thing: true
+  - module: my_other_super_module.SomeClass
+    config: {}
+</code></pre>
+<p>Each module is defined by a path to a Python class as well as a configuration. This
+information for a given module should be available in the module's own documentation.</p>
+<h2 id="using-multiple-modules"><a class="header" href="#using-multiple-modules">Using multiple modules</a></h2>
+<p>The order in which modules are listed in this section is important. When processing an
+action that can be handled by several modules, Synapse will always prioritise the module
+that appears first (i.e. is the highest in the list). This means:</p>
+<ul>
+<li>If several modules register the same callback, the callback registered by the module
+that appears first is used.</li>
+<li>If several modules try to register a handler for the same HTTP path, only the handler
+registered by the module that appears first is used. Handlers registered by the other
+module(s) are ignored and Synapse will log a warning message about them.</li>
+</ul>
+<p>Note that Synapse doesn't allow multiple modules implementing authentication checkers via
+the password auth provider feature for the same login type with different fields. If this
+happens, Synapse will refuse to start.</p>
+<h2 id="current-status"><a class="header" href="#current-status">Current status</a></h2>
+<p>We are currently in the process of migrating module interfaces to this system. While some
+interfaces might be compatible with it, others still require configuring modules in
+another part of Synapse's configuration file.</p>
+<p>Currently, only the following pre-existing interfaces are compatible with this new system:</p>
+<ul>
+<li>spam checker</li>
+<li>third-party rules</li>
+<li>presence router</li>
+<li>password auth providers</li>
+</ul>
+
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diff --git a/v1.50/modules/password_auth_provider_callbacks.html b/v1.50/modules/password_auth_provider_callbacks.html
new file mode 100644
index 0000000000..b68ee18177
--- /dev/null
+++ b/v1.50/modules/password_auth_provider_callbacks.html
@@ -0,0 +1,406 @@
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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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+                        <h1 id="password-auth-provider-callbacks"><a class="header" href="#password-auth-provider-callbacks">Password auth provider callbacks</a></h1>
+<p>Password auth providers offer a way for server administrators to integrate
+their Synapse installation with an external authentication system. The callbacks can be
+registered by using the Module API's <code>register_password_auth_provider_callbacks</code> method.</p>
+<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
+<h3 id="auth_checkers"><a class="header" href="#auth_checkers"><code>auth_checkers</code></a></h3>
+<p><em>First introduced in Synapse v1.46.0</em></p>
+<pre><code class="language-python">auth_checkers: Dict[Tuple[str, Tuple[str, ...]], Callable]
+</code></pre>
+<p>A dict mapping from tuples of a login type identifier (such as <code>m.login.password</code>) and a
+tuple of field names (such as <code>(&quot;password&quot;, &quot;secret_thing&quot;)</code>) to authentication checking
+callbacks, which should be of the following form:</p>
+<pre><code class="language-python">async def check_auth(
+    user: str,
+    login_type: str,
+    login_dict: &quot;synapse.module_api.JsonDict&quot;,
+) -&gt; Optional[
+    Tuple[
+        str, 
+        Optional[Callable[[&quot;synapse.module_api.LoginResponse&quot;], Awaitable[None]]]
+    ]
+]
+</code></pre>
+<p>The login type and field names should be provided by the user in the
+request to the <code>/login</code> API. <a href="https://matrix.org/docs/spec/client_server/latest#authentication-types">The Matrix specification</a>
+defines some types, however user defined ones are also allowed.</p>
+<p>The callback is passed the <code>user</code> field provided by the client (which might not be in
+<code>@username:server</code> form), the login type, and a dictionary of login secrets passed by
+the client.</p>
+<p>If the authentication is successful, the module must return the user's Matrix ID (e.g. 
+<code>@alice:example.com</code>) and optionally a callback to be called with the response to the
+<code>/login</code> request. If the module doesn't wish to return a callback, it must return <code>None</code>
+instead.</p>
+<p>If the authentication is unsuccessful, the module must return <code>None</code>.</p>
+<p>If multiple modules register an auth checker for the same login type but with different
+fields, Synapse will refuse to start.</p>
+<p>If multiple modules register an auth checker for the same login type with the same fields,
+then the callbacks will be executed in order, until one returns a Matrix User ID (and
+optionally a callback). In that case, the return value of that callback will be accepted
+and subsequent callbacks will not be fired. If every callback returns <code>None</code>, then the
+authentication fails.</p>
+<h3 id="check_3pid_auth"><a class="header" href="#check_3pid_auth"><code>check_3pid_auth</code></a></h3>
+<p><em>First introduced in Synapse v1.46.0</em></p>
+<pre><code class="language-python">async def check_3pid_auth(
+    medium: str, 
+    address: str,
+    password: str,
+) -&gt; Optional[
+    Tuple[
+        str, 
+        Optional[Callable[[&quot;synapse.module_api.LoginResponse&quot;], Awaitable[None]]]
+    ]
+]
+</code></pre>
+<p>Called when a user attempts to register or log in with a third party identifier,
+such as email. It is passed the medium (eg. <code>email</code>), an address (eg. <code>jdoe@example.com</code>)
+and the user's password.</p>
+<p>If the authentication is successful, the module must return the user's Matrix ID (e.g. 
+<code>@alice:example.com</code>) and optionally a callback to be called with the response to the <code>/login</code> request.
+If the module doesn't wish to return a callback, it must return None instead.</p>
+<p>If the authentication is unsuccessful, the module must return <code>None</code>.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>None</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>None</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback. If every callback return <code>None</code>,
+the authentication is denied.</p>
+<h3 id="on_logged_out"><a class="header" href="#on_logged_out"><code>on_logged_out</code></a></h3>
+<p><em>First introduced in Synapse v1.46.0</em></p>
+<pre><code class="language-python">async def on_logged_out(
+    user_id: str,
+    device_id: Optional[str],
+    access_token: str
+) -&gt; None
+</code></pre>
+<p>Called during a logout request for a user. It is passed the qualified user ID, the ID of the
+deactivated device (if any: access tokens are occasionally created without an associated
+device ID), and the (now deactivated) access token.</p>
+<p>If multiple modules implement this callback, Synapse runs them all in order.</p>
+<h2 id="example"><a class="header" href="#example">Example</a></h2>
+<p>The example module below implements authentication checkers for two different login types: </p>
+<ul>
+<li><code>my.login.type</code> 
+<ul>
+<li>Expects a <code>my_field</code> field to be sent to <code>/login</code></li>
+<li>Is checked by the method: <code>self.check_my_login</code></li>
+</ul>
+</li>
+<li><code>m.login.password</code> (defined in <a href="https://matrix.org/docs/spec/client_server/latest#password-based">the spec</a>)
+<ul>
+<li>Expects a <code>password</code> field to be sent to <code>/login</code></li>
+<li>Is checked by the method: <code>self.check_pass</code> </li>
+</ul>
+</li>
+</ul>
+<pre><code class="language-python">from typing import Awaitable, Callable, Optional, Tuple
+
+import synapse
+from synapse import module_api
+
+
+class MyAuthProvider:
+    def __init__(self, config: dict, api: module_api):
+
+        self.api = api
+
+        self.credentials = {
+            &quot;bob&quot;: &quot;building&quot;,
+            &quot;@scoop:matrix.org&quot;: &quot;digging&quot;,
+        }
+
+        api.register_password_auth_provider_callbacks(
+            auth_checkers={
+                (&quot;my.login_type&quot;, (&quot;my_field&quot;,)): self.check_my_login,
+                (&quot;m.login.password&quot;, (&quot;password&quot;,)): self.check_pass,
+            },
+        )
+
+    async def check_my_login(
+        self,
+        username: str,
+        login_type: str,
+        login_dict: &quot;synapse.module_api.JsonDict&quot;,
+    ) -&gt; Optional[
+        Tuple[
+            str,
+            Optional[Callable[[&quot;synapse.module_api.LoginResponse&quot;], Awaitable[None]]],
+        ]
+    ]:
+        if login_type != &quot;my.login_type&quot;:
+            return None
+
+        if self.credentials.get(username) == login_dict.get(&quot;my_field&quot;):
+            return self.api.get_qualified_user_id(username)
+
+    async def check_pass(
+        self,
+        username: str,
+        login_type: str,
+        login_dict: &quot;synapse.module_api.JsonDict&quot;,
+    ) -&gt; Optional[
+        Tuple[
+            str,
+            Optional[Callable[[&quot;synapse.module_api.LoginResponse&quot;], Awaitable[None]]],
+        ]
+    ]:
+        if login_type != &quot;m.login.password&quot;:
+            return None
+
+        if self.credentials.get(username) == login_dict.get(&quot;password&quot;):
+            return self.api.get_qualified_user_id(username)
+</code></pre>
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+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <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 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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/porting_legacy_module.html" class="active">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 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/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="../usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="../admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="../admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="../admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="../usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="../usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="../usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="../usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="../usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="../usage/administration/request_log.html">Request log 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/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 "><a href="../development/experimental_features.html">Experimental features</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 class="chapter-item expanded "><a href="../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="../development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="../other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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+                <script type="text/javascript">
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+                        <!-- Page table of contents -->
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+                            <nav class="pagetoc"></nav>
+                        </div>
+
+                        <h1 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></h1>
+<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="writing_a_module.html#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="writing_a_module.html#registering-a-web-resource">this section</a> for
+more info).</p>
+<p>There is no longer a <code>get_db_schema_files</code> callback provided for password auth provider modules. Any
+changes to the database should now be made by the module using the module API class.</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="index.html#using-modules">this section</a>
+for more info).</p>
+
+                    </main>
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\ No newline at end of file
diff --git a/v1.50/modules/presence_router_callbacks.html b/v1.50/modules/presence_router_callbacks.html
new file mode 100644
index 0000000000..eddd9d992c
--- /dev/null
+++ b/v1.50/modules/presence_router_callbacks.html
@@ -0,0 +1,337 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Presence router callbacks - Synapse</title>
+        
+        
+
+
+        <!-- Custom HTML head -->
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+
+
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+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
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+                        <h1 id="presence-router-callbacks"><a class="header" href="#presence-router-callbacks">Presence router callbacks</a></h1>
+<p>Presence router callbacks allow module developers to specify additional users (local or remote)
+to receive certain presence updates from local users. Presence router callbacks can be 
+registered using the module API's <code>register_presence_router_callbacks</code> method.</p>
+<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
+<p>The available presence router callbacks are:</p>
+<h3 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h3>
+<p><em>First introduced in Synapse v1.42.0</em></p>
+<pre><code class="language-python">async def get_users_for_states(
+    state_updates: Iterable[&quot;synapse.api.UserPresenceState&quot;],
+) -&gt; Dict[str, Set[&quot;synapse.api.UserPresenceState&quot;]]
+</code></pre>
+<p><strong>Requires</strong> <code>get_interested_users</code> to also be registered</p>
+<p>Called when processing updates to the presence state of one or more users. This callback can
+be used to instruct the server to forward that presence state to specific users. The module
+must return a dictionary that maps from Matrix user IDs (which can be local or remote) to the
+<code>UserPresenceState</code> changes that they should be forwarded.</p>
+<p>Synapse will then attempt to send the specified presence updates to each user when possible.</p>
+<p>If multiple modules implement this callback, Synapse merges all the dictionaries returned
+by the callbacks. If multiple callbacks return a dictionary containing the same key,
+Synapse concatenates the sets associated with this key from each dictionary. </p>
+<h3 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h3>
+<p><em>First introduced in Synapse v1.42.0</em></p>
+<pre><code class="language-python">async def get_interested_users(
+    user_id: str
+) -&gt; Union[Set[str], &quot;synapse.module_api.PRESENCE_ALL_USERS&quot;]
+</code></pre>
+<p><strong>Requires</strong> <code>get_users_for_states</code> to also be registered</p>
+<p>Called when determining which users someone should be able to see the presence state of. This
+callback should return complementary results to <code>get_users_for_state</code> or the presence information 
+may not be properly forwarded.</p>
+<p>The callback is given the Matrix user ID for a local user that is requesting presence data and
+should return the Matrix user IDs of the users whose presence state they are allowed to
+query. The returned users can be local or remote. </p>
+<p>Alternatively the callback can return <code>synapse.module_api.PRESENCE_ALL_USERS</code>
+to indicate that the user should receive updates from all known users.</p>
+<p>If multiple modules implement this callback, they will be considered in order. Synapse
+calls each callback one by one, and use a concatenation of all the <code>set</code>s returned by the
+callbacks. If one callback returns <code>synapse.module_api.PRESENCE_ALL_USERS</code>, Synapse uses
+this value instead. If this happens, Synapse does not call any of the subsequent
+implementations of this callback.</p>
+<h2 id="example"><a class="header" href="#example">Example</a></h2>
+<p>The example below is a module that implements both presence router callbacks, and ensures
+that <code>@alice:example.org</code> receives all presence updates from <code>@bob:example.com</code> and
+<code>@charlie:somewhere.org</code>, regardless of whether Alice shares a room with any of them.</p>
+<pre><code class="language-python">from typing import Dict, Iterable, Set, Union
+
+from synapse.module_api import ModuleApi
+
+
+class CustomPresenceRouter:
+    def __init__(self, config: dict, api: ModuleApi):
+        self.api = api
+
+        self.api.register_presence_router_callbacks(
+            get_users_for_states=self.get_users_for_states,
+            get_interested_users=self.get_interested_users,
+        )
+
+    async def get_users_for_states(
+        self,
+        state_updates: Iterable[&quot;synapse.api.UserPresenceState&quot;],
+    ) -&gt; Dict[str, Set[&quot;synapse.api.UserPresenceState&quot;]]:
+        res = {}
+        for update in state_updates:
+            if (
+                update.user_id == &quot;@bob:example.com&quot;
+                or update.user_id == &quot;@charlie:somewhere.org&quot;
+            ):
+                res.setdefault(&quot;@alice:example.com&quot;, set()).add(update)
+
+        return res
+
+    async def get_interested_users(
+        self,
+        user_id: str,
+    ) -&gt; Union[Set[str], &quot;synapse.module_api.PRESENCE_ALL_USERS&quot;]:
+        if user_id == &quot;@alice:example.com&quot;:
+            return {&quot;@bob:example.com&quot;, &quot;@charlie:somewhere.org&quot;}
+
+        return set()
+</code></pre>
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+                        <h1 id="spam-checker-callbacks"><a class="header" href="#spam-checker-callbacks">Spam checker callbacks</a></h1>
+<p>Spam checker callbacks allow module developers to implement spam mitigation actions for
+Synapse instances. Spam checker callbacks can be registered using the module API's
+<code>register_spam_checker_callbacks</code> method.</p>
+<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
+<p>The available spam checker callbacks are:</p>
+<h3 id="check_event_for_spam"><a class="header" href="#check_event_for_spam"><code>check_event_for_spam</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def check_event_for_spam(event: &quot;synapse.events.EventBase&quot;) -&gt; Union[bool, str]
+</code></pre>
+<p>Called when receiving an event from a client or via federation. The module can return
+either a <code>bool</code> to indicate whether the event must be rejected because of spam, or a <code>str</code>
+to indicate the event must be rejected because of spam and to give a rejection reason to
+forward to clients.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>False</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_join_room"><a class="header" href="#user_may_join_room"><code>user_may_join_room</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def user_may_join_room(user: str, room: str, is_invited: bool) -&gt; bool
+</code></pre>
+<p>Called when a user is trying to join a room. The module must return a <code>bool</code> to indicate
+whether the user can join the room. The user is represented by their Matrix user ID (e.g.
+<code>@alice:example.com</code>) and the room is represented by its Matrix ID (e.g.
+<code>!room:example.com</code>). The module is also given a boolean to indicate whether the user
+currently has a pending invite in the room.</p>
+<p>This callback isn't called if the join is performed by a server administrator, or in the
+context of a room creation.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_invite"><a class="header" href="#user_may_invite"><code>user_may_invite</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def user_may_invite(inviter: str, invitee: str, room_id: str) -&gt; bool
+</code></pre>
+<p>Called when processing an invitation. The module must return a <code>bool</code> indicating whether
+the inviter can invite the invitee to the given room. Both inviter and invitee are
+represented by their Matrix user ID (e.g. <code>@alice:example.com</code>).</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_send_3pid_invite"><a class="header" href="#user_may_send_3pid_invite"><code>user_may_send_3pid_invite</code></a></h3>
+<p><em>First introduced in Synapse v1.45.0</em></p>
+<pre><code class="language-python">async def user_may_send_3pid_invite(
+    inviter: str,
+    medium: str,
+    address: str,
+    room_id: str,
+) -&gt; bool
+</code></pre>
+<p>Called when processing an invitation using a third-party identifier (also called a 3PID,
+e.g. an email address or a phone number). The module must return a <code>bool</code> indicating
+whether the inviter can invite the invitee to the given room.</p>
+<p>The inviter is represented by their Matrix user ID (e.g. <code>@alice:example.com</code>), and the
+invitee is represented by its medium (e.g. &quot;email&quot;) and its address
+(e.g. <code>alice@example.com</code>). See <a href="https://matrix.org/docs/spec/appendices#pid-types">the Matrix specification</a>
+for more information regarding third-party identifiers.</p>
+<p>For example, a call to this callback to send an invitation to the email address
+<code>alice@example.com</code> would look like this:</p>
+<pre><code class="language-python">await user_may_send_3pid_invite(
+    &quot;@bob:example.com&quot;,  # The inviter's user ID
+    &quot;email&quot;,  # The medium of the 3PID to invite
+    &quot;alice@example.com&quot;,  # The address of the 3PID to invite
+    &quot;!some_room:example.com&quot;,  # The ID of the room to send the invite into
+)
+</code></pre>
+<p><strong>Note</strong>: If the third-party identifier is already associated with a matrix user ID,
+<a href="#user_may_invite"><code>user_may_invite</code></a> will be used instead.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_create_room"><a class="header" href="#user_may_create_room"><code>user_may_create_room</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def user_may_create_room(user: str) -&gt; bool
+</code></pre>
+<p>Called when processing a room creation request. The module must return a <code>bool</code> indicating
+whether the given user (represented by their Matrix user ID) is allowed to create a room.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_create_room_alias"><a class="header" href="#user_may_create_room_alias"><code>user_may_create_room_alias</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def user_may_create_room_alias(user: str, room_alias: &quot;synapse.types.RoomAlias&quot;) -&gt; bool
+</code></pre>
+<p>Called when trying to associate an alias with an existing room. The module must return a
+<code>bool</code> indicating whether the given user (represented by their Matrix user ID) is allowed
+to set the given alias.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="user_may_publish_room"><a class="header" href="#user_may_publish_room"><code>user_may_publish_room</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def user_may_publish_room(user: str, room_id: str) -&gt; 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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="check_username_for_spam"><a class="header" href="#check_username_for_spam"><code>check_username_for_spam</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def check_username_for_spam(user_profile: Dict[str, str]) -&gt; 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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>False</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="check_registration_for_spam"><a class="header" href="#check_registration_for_spam"><code>check_registration_for_spam</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></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,
+) -&gt; &quot;synapse.spam_checker_api.RegistrationBehaviour&quot;
+</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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>RegistrationBehaviour.ALLOW</code>, Synapse falls through to the next one.
+The value of the first callback that does not return <code>RegistrationBehaviour.ALLOW</code> will
+be used. If this happens, Synapse will not call any of the subsequent implementations of
+this callback.</p>
+<h3 id="check_media_file_for_spam"><a class="header" href="#check_media_file_for_spam"><code>check_media_file_for_spam</code></a></h3>
+<p><em>First introduced in Synapse v1.37.0</em></p>
+<pre><code class="language-python">async def check_media_file_for_spam(
+    file_wrapper: &quot;synapse.rest.media.v1.media_storage.ReadableFileWrapper&quot;,
+    file_info: &quot;synapse.rest.media.v1._base.FileInfo&quot;,
+) -&gt; 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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>False</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h2 id="example"><a class="header" href="#example">Example</a></h2>
+<p>The example below is a module that implements the spam checker callback
+<code>check_event_for_spam</code> to deny any message sent by users whose Matrix user IDs are
+mentioned in a configured list, and registers a web resource to the path
+<code>/_synapse/client/list_spam_checker/is_evil</code> that returns a JSON object indicating
+whether the provided user appears in that list.</p>
+<pre><code class="language-python">import json
+from typing import Union
+
+from twisted.web.resource import Resource
+from twisted.web.server import Request
+
+from synapse.module_api import ModuleApi
+
+
+class IsUserEvilResource(Resource):
+    def __init__(self, config):
+        super(IsUserEvilResource, self).__init__()
+        self.evil_users = config.get(&quot;evil_users&quot;) or []
+
+    def render_GET(self, request: Request):
+        user = request.args.get(b&quot;user&quot;)[0].decode()
+        request.setHeader(b&quot;Content-Type&quot;, b&quot;application/json&quot;)
+        return json.dumps({&quot;evil&quot;: user in self.evil_users}).encode()
+
+
+class ListSpamChecker:
+    def __init__(self, config: dict, api: ModuleApi):
+        self.api = api
+        self.evil_users = config.get(&quot;evil_users&quot;) or []
+
+        self.api.register_spam_checker_callbacks(
+            check_event_for_spam=self.check_event_for_spam,
+        )
+
+        self.api.register_web_resource(
+            path=&quot;/_synapse/client/list_spam_checker/is_evil&quot;,
+            resource=IsUserEvilResource(config),
+        )
+
+    async def check_event_for_spam(self, event: &quot;synapse.events.EventBase&quot;) -&gt; Union[bool, str]:
+        return event.sender not in self.evil_users
+</code></pre>
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+                        <h1 id="third-party-rules-callbacks"><a class="header" href="#third-party-rules-callbacks">Third party rules callbacks</a></h1>
+<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>
+<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
+<p>The available third party rules callbacks are:</p>
+<h3 id="check_event_allowed"><a class="header" href="#check_event_allowed"><code>check_event_allowed</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def check_event_allowed(
+    event: &quot;synapse.events.EventBase&quot;,
+    state_events: &quot;synapse.types.StateMap&quot;,
+) -&gt; 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((&quot;m.room.create&quot;, &quot;&quot;))</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>If <code>check_event_allowed</code> raises an exception, the module is assumed to have failed.
+The event will not be accepted but is not treated as explicitly rejected, either.
+An HTTP request causing the module check will likely result in a 500 Internal
+Server Error.</p>
+<p>When the boolean returned by the module is <code>False</code>, the event is rejected.
+(Module developers should not use exceptions for rejection.)</p>
+<p>Note that replacing the event only works for events sent by local users, not for events
+received over federation.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="on_create_room"><a class="header" href="#on_create_room"><code>on_create_room</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def on_create_room(
+    requester: &quot;synapse.types.Requester&quot;,
+    request_content: dict,
+    is_requester_admin: bool,
+) -&gt; 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>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns without raising an exception, Synapse falls through to the next one. The
+room creation will be forbidden as soon as one of the callbacks raises an exception. If
+this happens, Synapse will not call any of the subsequent implementations of this
+callback.</p>
+<h3 id="check_threepid_can_be_invited"><a class="header" href="#check_threepid_can_be_invited"><code>check_threepid_can_be_invited</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def check_threepid_can_be_invited(
+    medium: str,
+    address: str,
+    state_events: &quot;synapse.types.StateMap&quot;,
+) -&gt; bool:
+</code></pre>
+<p>Called when processing an invite via a third-party identifier (i.e. email or phone number).
+The module must return a boolean indicating whether the invite can go through.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="check_visibility_can_be_modified"><a class="header" href="#check_visibility_can_be_modified"><code>check_visibility_can_be_modified</code></a></h3>
+<p><em>First introduced in Synapse v1.39.0</em></p>
+<pre><code class="language-python">async def check_visibility_can_be_modified(
+    room_id: str,
+    state_events: &quot;synapse.types.StateMap&quot;,
+    new_visibility: str,
+) -&gt; bool:
+</code></pre>
+<p>Called when changing the visibility of a room in the local public room directory. The
+visibility is a string that's either &quot;public&quot; or &quot;private&quot;. The module must return a
+boolean indicating whether the change can go through.</p>
+<p>If multiple modules implement this callback, they will be considered in order. If a
+callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
+callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback.</p>
+<h3 id="on_new_event"><a class="header" href="#on_new_event"><code>on_new_event</code></a></h3>
+<p><em>First introduced in Synapse v1.47.0</em></p>
+<pre><code class="language-python">async def on_new_event(
+    event: &quot;synapse.events.EventBase&quot;,
+    state_events: &quot;synapse.types.StateMap&quot;,
+) -&gt; None:
+</code></pre>
+<p>Called after sending an event into a room. The module is passed the event, as well
+as the state of the room <em>after</em> the event. This means that if the event is a state event,
+it will be included in this state.</p>
+<p>Note that this callback is called when the event has already been processed and stored
+into the room, which means this callback cannot be used to deny persisting the event. To
+deny an incoming event, see <a href="spam_checker_callbacks.html#check_event_for_spam"><code>check_event_for_spam</code></a> instead.</p>
+<p>If multiple modules implement this callback, Synapse runs them all in order.</p>
+<h2 id="example"><a class="header" href="#example">Example</a></h2>
+<p>The example below is a module that implements the third-party rules callback
+<code>check_event_allowed</code> to censor incoming messages as dictated by a third-party service.</p>
+<pre><code class="language-python">from typing import Optional, Tuple
+
+from synapse.module_api import ModuleApi
+
+_DEFAULT_CENSOR_ENDPOINT = &quot;https://my-internal-service.local/censor-event&quot;
+
+class EventCensorer:
+    def __init__(self, config: dict, api: ModuleApi):
+        self.api = api
+        self._endpoint = config.get(&quot;endpoint&quot;, _DEFAULT_CENSOR_ENDPOINT)
+
+        self.api.register_third_party_rules_callbacks(
+            check_event_allowed=self.check_event_allowed,
+        )
+
+    async def check_event_allowed(
+        self,
+        event: &quot;synapse.events.EventBase&quot;,
+        state_events: &quot;synapse.types.StateMap&quot;,
+    ) -&gt; Tuple[bool, Optional[dict]]:
+        event_dict = event.get_dict()
+        new_event_content = await self.api.http_client.post_json_get_json(
+            uri=self._endpoint, post_json=event_dict,
+        )
+        event_dict[&quot;content&quot;] = new_event_content
+        return event_dict
+</code></pre>
+
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+
+                        <h1 id="writing-a-module"><a class="header" href="#writing-a-module">Writing a module</a></h1>
+<p>A module is a Python class that uses Synapse's module API to interact with the
+homeserver. It can register callbacks that Synapse will call on specific operations, as
+well as web resources to attach to Synapse's web server.</p>
+<p>When instantiated, a module is given its parsed configuration as well as an instance of
+the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dictionary, and is
+either the output of the module's <code>parse_config</code> static method (see below), or the
+configuration associated with the module in Synapse's configuration file.</p>
+<p>See the documentation for the <code>ModuleApi</code> class
+<a href="https://github.com/matrix-org/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
+<h2 id="when-synapse-runs-with-several-modules-configured"><a class="header" href="#when-synapse-runs-with-several-modules-configured">When Synapse runs with several modules configured</a></h2>
+<p>If Synapse is running with other modules configured, the order each module appears in
+within the <code>modules</code> section of the Synapse configuration file might restrict what it can
+or cannot register. See <a href="index.html#using-multiple-modules">this section</a> for more
+information.</p>
+<p>On top of the rules listed in the link above, if a callback returns a value that should
+cause the current operation to fail (e.g. if a callback checking an event returns with a
+value that should cause the event to be denied), Synapse will fail the operation and
+ignore any subsequent callbacks that should have been run after this one.</p>
+<p>The documentation for each callback mentions how Synapse behaves when
+multiple modules implement it.</p>
+<h2 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h2>
+<p>A module can implement the following static method:</p>
+<pre><code class="language-python">@staticmethod
+def parse_config(config: dict) -&gt; dict
+</code></pre>
+<p>This method is given a dictionary resulting from parsing the YAML configuration for the
+module. It may modify it (for example by parsing durations expressed as strings (e.g.
+&quot;5d&quot;) into milliseconds, etc.), and return the modified dictionary. It may also verify
+that the configuration is correct, and raise an instance of
+<code>synapse.module_api.errors.ConfigError</code> if not.</p>
+<h2 id="registering-a-web-resource"><a class="header" href="#registering-a-web-resource">Registering a web resource</a></h2>
+<p>Modules can register web resources onto Synapse's web server using the following module
+API method:</p>
+<pre><code class="language-python">def ModuleApi.register_web_resource(path: str, resource: IResource) -&gt; None
+</code></pre>
+<p>The path is the full absolute path to register the resource at. For example, if you
+register a resource for the path <code>/_synapse/client/my_super_module/say_hello</code>, Synapse
+will serve it at <code>http(s)://[HS_URL]/_synapse/client/my_super_module/say_hello</code>. Note
+that Synapse does not allow registering resources for several sub-paths in the <code>/_matrix</code>
+namespace (such as anything under <code>/_matrix/client</code> for example). It is strongly
+recommended that modules register their web resources under the <code>/_synapse/client</code>
+namespace.</p>
+<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>
+interface (such as <a href="https://twistedmatrix.com/documents/current/api/twisted.web.resource.Resource.html">Resource</a>).</p>
+<p>Only one resource can be registered for a given path. If several modules attempt to
+register a resource for the same path, the module that appears first in Synapse's
+configuration file takes priority.</p>
+<p>Modules <strong>must</strong> register their web resources in their <code>__init__</code> method.</p>
+<h2 id="registering-a-callback"><a class="header" href="#registering-a-callback">Registering a callback</a></h2>
+<p>Modules can use Synapse's module API to register callbacks. Callbacks are functions that
+Synapse will call when performing specific actions. Callbacks must be asynchronous (unless
+specified otherwise), and are split in categories. A single module may implement callbacks
+from multiple categories, and is under no obligation to implement all callbacks from the
+categories it registers callbacks for.</p>
+<p>Modules can register callbacks using one of the module API's <code>register_[...]_callbacks</code>
+methods. The callback functions are passed to these methods as keyword arguments, with
+the callback name as the argument name and the function as its value. A
+<code>register_[...]_callbacks</code> method exists for each category.</p>
+<p>Callbacks for each category can be found on their respective page of the
+<a href="https://matrix-org.github.io/synapse">Synapse documentation website</a>.</p>
+
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author	reivilibre <reivilibre@users.noreply.github.com>	2022-01-05 12:40:23 +0000
committer	reivilibre <reivilibre@users.noreply.github.com>	2022-01-05 12:40:23 +0000
commit	405951e9c57c59b63bcdcefdc356dbd2bc50174a (patch)
tree	a6adfeb1516eaa5169da8cc709f1475b8d8b04da /v1.50/modules
parent	deploy: eedb4527f1524fc3b83cd4838774b04d6f1e3911 (diff)
download	synapse-405951e9c57c59b63bcdcefdc356dbd2bc50174a.tar.xz