<!DOCTYPE HTML> <html lang="en" class="sidebar-visible no-js light"> <head> <!-- Book generated using mdBook --> <meta charset="UTF-8"> <title>Third-party rules callbacks - 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"> <link rel="stylesheet" href="../docs/website_files/version-picker.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 ? 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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> <i class="fa fa-search"></i> </button> <div class="version-picker"> <div class="dropdown"> <div class="select"> <span></span> <i class="fa fa-chevron-down"></i> </div> <input type="hidden" name="version"> <ul class="dropdown-menu"> <!-- Versions will be added dynamically in version-picker.js --> </ul> </div> </div> </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/element-hq/synapse" title="Git repository" aria-label="Git repository"> <i id="git-repository-button" class="fa fa-github"></i> </a> <a href="https://github.com/element-hq/synapse/edit/develop/docs/modules/third_party_rules_callbacks.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="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: "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>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: "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> <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: "synapse.types.StateMap", ) -> 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: "synapse.types.StateMap", new_visibility: str, ) -> 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 "public" or "private". 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: "synapse.events.EventBase", state_events: "synapse.types.StateMap", ) -> 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>For any given event, this callback will be called on every worker process, even if that worker will not end up acting on that event. This callback will not be called for events that are marked as rejected.</p> <p>If multiple modules implement this callback, Synapse runs them all in order.</p> <h3 id="check_can_shutdown_room"><a class="header" href="#check_can_shutdown_room"><code>check_can_shutdown_room</code></a></h3> <p><em>First introduced in Synapse v1.55.0</em></p> <pre><code class="language-python">async def check_can_shutdown_room( user_id: str, room_id: str, ) -> bool: </code></pre> <p>Called when an admin user requests the shutdown of a room. The module must return a boolean indicating whether the shutdown can go through. If the callback returns <code>False</code>, the shutdown will not proceed and the caller will see a <code>M_FORBIDDEN</code> error.</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_can_deactivate_user"><a class="header" href="#check_can_deactivate_user"><code>check_can_deactivate_user</code></a></h3> <p><em>First introduced in Synapse v1.55.0</em></p> <pre><code class="language-python">async def check_can_deactivate_user( user_id: str, by_admin: bool, ) -> bool: </code></pre> <p>Called when the deactivation of a user is requested. User deactivation can be performed by an admin or the user themselves, so developers are encouraged to check the requester when implementing this callback. The module must return a boolean indicating whether the deactivation can go through. If the callback returns <code>False</code>, the deactivation will not proceed and the caller will see a <code>M_FORBIDDEN</code> error.</p> <p>The module is passed two parameters, <code>user_id</code> which is the ID of the user being deactivated, and <code>by_admin</code> which is <code>True</code> if the request is made by a serve admin, and <code>False</code> otherwise.</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_profile_update"><a class="header" href="#on_profile_update"><code>on_profile_update</code></a></h3> <p><em>First introduced in Synapse v1.54.0</em></p> <pre><code class="language-python">async def on_profile_update( user_id: str, new_profile: "synapse.module_api.ProfileInfo", by_admin: bool, deactivation: bool, ) -> None: </code></pre> <p>Called after updating a local user's profile. The update can be triggered either by the user themselves or a server admin. The update can also be triggered by a user being deactivated (in which case their display name is set to an empty string (<code>""</code>) and the avatar URL is set to <code>None</code>). The module is passed the Matrix ID of the user whose profile has been updated, their new profile, as well as a <code>by_admin</code> boolean that is <code>True</code> if the update was triggered by a server admin (and <code>False</code> otherwise), and a <code>deactivated</code> boolean that is <code>True</code> if the update is a result of the user being deactivated.</p> <p>Note that the <code>by_admin</code> boolean is also <code>True</code> if the profile change happens as a result of the user logging in through Single Sign-On, or if a server admin updates their own profile.</p> <p>Per-room profile changes do not trigger this callback to be called. Synapse administrators wishing this callback to be called on every profile change are encouraged to disable per-room profiles globally using the <code>allow_per_room_profiles</code> configuration setting in Synapse's configuration file. This callback is not called when registering a user, even when setting it through the <a href="https://element-hq.github.io/synapse/latest/modules/password_auth_provider_callbacks.html#get_displayname_for_registration"><code>get_displayname_for_registration</code></a> module callback.</p> <p>If multiple modules implement this callback, Synapse runs them all in order.</p> <h3 id="on_user_deactivation_status_changed"><a class="header" href="#on_user_deactivation_status_changed"><code>on_user_deactivation_status_changed</code></a></h3> <p><em>First introduced in Synapse v1.54.0</em></p> <pre><code class="language-python">async def on_user_deactivation_status_changed( user_id: str, deactivated: bool, by_admin: bool ) -> None: </code></pre> <p>Called after deactivating a local user, or reactivating them through the admin API. The deactivation can be triggered either by the user themselves or a server admin. The module is passed the Matrix ID of the user whose status is changed, as well as a <code>deactivated</code> boolean that is <code>True</code> if the user is being deactivated and <code>False</code> if they're being reactivated, and a <code>by_admin</code> boolean that is <code>True</code> if the deactivation was triggered by a server admin (and <code>False</code> otherwise). This latter <code>by_admin</code> boolean is always <code>True</code> if the user is being reactivated, as this operation can only be performed through the admin API.</p> <p>If multiple modules implement this callback, Synapse runs them all in order.</p> <h3 id="on_threepid_bind"><a class="header" href="#on_threepid_bind"><code>on_threepid_bind</code></a></h3> <p><em>First introduced in Synapse v1.56.0</em></p> <p><strong><span style="color:red"> This callback is deprecated in favour of the <code>on_add_user_third_party_identifier</code> callback, which features the same functionality. The only difference is in name. </span></strong></p> <pre><code class="language-python">async def on_threepid_bind(user_id: str, medium: str, address: str) -> None: </code></pre> <p>Called after creating an association between a local user and a third-party identifier (email address, phone number). The module is given the Matrix ID of the user the association is for, as well as the medium (<code>email</code> or <code>msisdn</code>) and address of the third-party identifier.</p> <p>Note that this callback is <em>not</em> called after a successful association on an <em>identity server</em>.</p> <p>If multiple modules implement this callback, Synapse runs them all in order.</p> <h3 id="on_add_user_third_party_identifier"><a class="header" href="#on_add_user_third_party_identifier"><code>on_add_user_third_party_identifier</code></a></h3> <p><em>First introduced in Synapse v1.79.0</em></p> <pre><code class="language-python">async def on_add_user_third_party_identifier(user_id: str, medium: str, address: str) -> None: </code></pre> <p>Called after successfully creating an association between a user and a third-party identifier (email address, phone number). The module is given the Matrix ID of the user the association is for, as well as the medium (<code>email</code> or <code>msisdn</code>) and address of the third-party identifier (i.e. an email address).</p> <p>Note that this callback is <em>not</em> called if a user attempts to bind their third-party identifier to an identity server (via a call to <a href="https://spec.matrix.org/v1.5/client-server-api/#post_matrixclientv3account3pidbind"><code>POST /_matrix/client/v3/account/3pid/bind</code></a>).</p> <p>If multiple modules implement this callback, Synapse runs them all in order.</p> <h3 id="on_remove_user_third_party_identifier"><a class="header" href="#on_remove_user_third_party_identifier"><code>on_remove_user_third_party_identifier</code></a></h3> <p><em>First introduced in Synapse v1.79.0</em></p> <pre><code class="language-python">async def on_remove_user_third_party_identifier(user_id: str, medium: str, address: str) -> None: </code></pre> <p>Called after successfully removing an association between a user and a third-party identifier (email address, phone number). The module is given the Matrix ID of the user the association is for, as well as the medium (<code>email</code> or <code>msisdn</code>) and address of the third-party identifier (i.e. an email address).</p> <p>Note that this callback is <em>not</em> called if a user attempts to unbind their third-party identifier from an identity server (via a call to <a href="https://spec.matrix.org/v1.5/client-server-api/#post_matrixclientv3account3pidunbind"><code>POST /_matrix/client/v3/account/3pid/unbind</code></a>).</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 = "https://my-internal-service.local/censor-event" class EventCensorer: def __init__(self, config: dict, api: ModuleApi): self.api = api self._endpoint = config.get("endpoint", _DEFAULT_CENSOR_ENDPOINT) self.api.register_third_party_rules_callbacks( check_event_allowed=self.check_event_allowed, ) async def check_event_allowed( self, event: "synapse.events.EventBase", state_events: "synapse.types.StateMap", ) -> 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["content"] = new_event_content return event_dict </code></pre> </main> <nav class="nav-wrapper" aria-label="Page navigation"> <!-- Mobile navigation buttons --> <a rel="prev" href="../modules/spam_checker_callbacks.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="../modules/presence_router_callbacks.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="../modules/spam_checker_callbacks.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="../modules/presence_router_callbacks.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> <script type="text/javascript" src="../docs/website_files/version-picker.js"></script> <script type="text/javascript" src="../docs/website_files/version.js"></script> </body> </html>