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| author | reivilibre <reivilibre@users.noreply.github.com> | 2021-08-31 13:20:39 +0000 |
|---|---|---|
| committer | reivilibre <reivilibre@users.noreply.github.com> | 2021-08-31 13:20:39 +0000 |
| commit | 3ed8770973ba251ae31f9389040af1c9ef6104d1 (patch) | |
| tree | d1fc7da9f48bc7edf43b9fb23ec0573113857b7f /v1.42/modules.html | |
| parent | deploy: 46ff99ef95592cd10f2c86ea4f4434c25707bea0 (diff) | |
| download | synapse-3ed8770973ba251ae31f9389040af1c9ef6104d1.tar.xz | |
deploy: 5d9e7e0c713b5c0057f9e53720f25ecf4d296e66
Diffstat (limited to 'v1.42/modules.html')
| -rw-r--r-- | v1.42/modules.html | 555 |
1 files changed, 555 insertions, 0 deletions
diff --git a/v1.42/modules.html b/v1.42/modules.html new file mode 100644 index 0000000000..4efb19d991 --- /dev/null +++ b/v1.42/modules.html @@ -0,0 +1,555 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>Pluggable Modules - Synapse</title> + + + + + <!-- Custom HTML head --> + + + + <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff" /> + + + <link rel="icon" href="favicon.svg"> + + + <link rel="shortcut icon" href="favicon.png"> + + <link rel="stylesheet" href="css/variables.css"> + <link rel="stylesheet" href="css/general.css"> + <link rel="stylesheet" href="css/chrome.css"> + + <link rel="stylesheet" href="css/print.css" media="print"> + + + <!-- Fonts --> + <link rel="stylesheet" href="FontAwesome/css/font-awesome.css"> + + <link rel="stylesheet" href="fonts/fonts.css"> + + + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="highlight.css"> + <link rel="stylesheet" href="tomorrow-night.css"> + <link rel="stylesheet" href="ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + + <link rel="stylesheet" href="docs/website_files/table-of-contents.css"> + + <link rel="stylesheet" href="docs/website_files/remove-nav-buttons.css"> + + <link rel="stylesheet" href="docs/website_files/indent-section-headers.css"> + + + + </head> + <body> + <!-- Provide site root to javascript --> + <script type="text/javascript"> + var path_to_root = ""; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light"; + </script> + + <!-- Work around some values being stored in localStorage wrapped in quotes --> + <script type="text/javascript"> + try { + var theme = localStorage.getItem('mdbook-theme'); + var sidebar = localStorage.getItem('mdbook-sidebar'); + if (theme.startsWith('"') && theme.endsWith('"')) { + localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1)); + } + if (sidebar.startsWith('"') && sidebar.endsWith('"')) { + localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1)); + } + } catch (e) { } + </script> + + <!-- Set the theme before any content is loaded, prevents flash --> + <script type="text/javascript"> + var theme; + try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } + if (theme === null || theme === undefined) { theme = default_theme; } + var html = document.querySelector('html'); + html.classList.remove('no-js') + html.classList.remove('light') + html.classList.add(theme); + html.classList.add('js'); + </script> + + <!-- Hide / unhide sidebar before it is displayed --> + <script type="text/javascript"> + var html = document.querySelector('html'); + var sidebar = 'hidden'; + if (document.body.clientWidth >= 1080) { + try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { } + sidebar = sidebar || 'visible'; + } + html.classList.remove('sidebar-visible'); + html.classList.add("sidebar-" + sidebar); + </script> + + <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 href="usage/configuration/user_authentication/index.html">User Authentication</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="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><div>SAML</div></li><li class="chapter-item expanded "><div>CAS</div></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></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="url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules.html" class="active">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Third Party Rules</div></li><li class="chapter-item expanded "><a href="spam_checker.html">Spam Checker</a></li><li class="chapter-item expanded "><a href="presence_router_module.html">Presence Router</a></li><li class="chapter-item expanded "><div>Media Storage Providers</div></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="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></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/request_log.html">Request log format</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 "><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></ol> + </div> + <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div> + </nav> + + <div id="page-wrapper" class="page-wrapper"> + + <div class="page"> + + <div id="menu-bar-hover-placeholder"></div> + <div id="menu-bar" class="menu-bar sticky bordered"> + <div class="left-buttons"> + <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> + <i class="fa fa-bars"></i> + </button> + <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list"> + <i class="fa fa-paint-brush"></i> + </button> + <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu"> + <li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li> + <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li> + <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li> + <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li> + <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li> + </ul> + + <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + + </div> + + <h1 class="menu-title">Synapse</h1> + + <div class="right-buttons"> + + <a href="print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + + + <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository"> + <i id="git-repository-button" class="fa fa-github"></i> + </a> + + + <a href="https://github.com/matrix-org/synapse/edit/develop/docs/modules.md" title="Suggest an edit" aria-label="Suggest an edit"> + <i id="git-edit-button" class="fa fa-edit"></i> + </a> + + + </div> + </div> + + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + + + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script type="text/javascript"> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <!-- Page table of contents --> + <div class="sidetoc"> + <nav class="pagetoc"></nav> + </div> + + <h1 id="modules"><a class="header" href="#modules">Modules</a></h1> +<p>Synapse supports extending its functionality by configuring external modules.</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> +<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> +<p>Also note that 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. Currently, only the +spam checker interface is compatible with this new system.</p> +<h2 id="writing-a-module"><a class="header" href="#writing-a-module">Writing a module</a></h2> +<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> +<h3 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h3> +<p>A module can implement the following static method:</p> +<pre><code class="language-python">@staticmethod +def parse_config(config: dict) -> 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. +"5d") 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> +<h3 id="registering-a-web-resource"><a class="header" href="#registering-a-web-resource">Registering a web resource</a></h3> +<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) -> 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> +<h3 id="registering-a-callback"><a class="header" href="#registering-a-callback">Registering a callback</a></h3> +<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, 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. This is demonstrated +in the example below. A <code>register_[...]_callbacks</code> method exists for each module type +documented in this section.</p> +<h4 id="spam-checker-callbacks"><a class="header" href="#spam-checker-callbacks">Spam checker callbacks</a></h4> +<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> +<p>The available spam checker callbacks are:</p> +<pre><code class="language-python">async def check_event_for_spam(event: "synapse.events.EventBase") -> 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> +<pre><code class="language-python">async def user_may_invite(inviter: str, invitee: str, room_id: str) -> 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> +<pre><code class="language-python">async def user_may_create_room(user: str) -> 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> +<pre><code class="language-python">async def user_may_create_room_alias(user: str, room_alias: "synapse.types.RoomAlias") -> 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> +<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> +<h4 id="presence-router-callbacks"><a class="header" href="#presence-router-callbacks">Presence router callbacks</a></h4> +<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> +<p>The available presence router callbacks are:</p> +<pre><code class="language-python">async def get_users_for_states( + self, + state_updates: Iterable["synapse.api.UserPresenceState"], +) -> Dict[str, Set["synapse.api.UserPresenceState"]]: +</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> +<pre><code class="language-python">async def get_interested_users( + self, + user_id: str +) -> Union[Set[str], "synapse.module_api.PRESENCE_ALL_USERS"] +</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>For example, if the user <code>@alice:example.org</code> is passed to this method, and the Set +<code>{"@bob:example.com", "@charlie:somewhere.org"}</code> is returned, this signifies that Alice +should receive presence updates sent by Bob and Charlie, regardless of whether these users +share a room.</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> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="message_retention_policies.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="spam_checker.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + + <a rel="prev" href="message_retention_policies.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="spam_checker.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + </nav> + + </div> + + + + + + + + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + + + + + + <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="searcher.js" type="text/javascript" charset="utf-8"></script> + + + <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + + <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> + + + + + </body> +</html> \ No newline at end of file |