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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> + + <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/presence_router_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="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["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> +<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 +) -> 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>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["synapse.api.UserPresenceState"], + ) -> Dict[str, Set["synapse.api.UserPresenceState"]]: + res = {} + for update in state_updates: + if ( + update.user_id == "@bob:example.com" + or update.user_id == "@charlie:somewhere.org" + ): + res.setdefault("@alice:example.com", set()).add(update) + + return res + + async def get_interested_users( + self, + user_id: str, + ) -> Union[Set[str], "synapse.module_api.PRESENCE_ALL_USERS"]: + if user_id == "@alice:example.com": + return {"@bob:example.com", "@charlie:somewhere.org"} + + return set() +</code></pre> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="../modules/third_party_rules_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/account_validity_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/third_party_rules_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/account_validity_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> + + + + + </body> +</html> \ No newline at end of file |