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<main>
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<h1 id="presence-router-callbacks"><a class="header" href="#presence-router-callbacks">Presence router callbacks</a></h1>
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<p>Presence router callbacks allow module developers to define additional users
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which receive presence updates from local users. The additional users
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can be local or remote.</p>
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<p>For example, it could be used to direct all of <code>@alice:example.com</code> (a local user)’s
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presence updates to <code>@bob:matrix.org</code> (a remote user), even though they don’t share a
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room. (Note that those presence updates might not make it to <code>@bob:matrix.org</code>’s client
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unless a similar presence router is running on that homeserver.)</p>
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<p>Presence router callbacks can be registered using the module API’s
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<code>register_presence_router_callbacks</code> method.</p>
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<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
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<p>The available presence router callbacks are:</p>
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<h3 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h3>
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<p><em>First introduced in Synapse v1.42.0</em></p>
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<pre><code class="language-python">async def get_users_for_states(
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state_updates: Iterable["synapse.api.UserPresenceState"],
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) -> dict[str, set["synapse.api.UserPresenceState"]]
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</code></pre>
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<p><strong>Requires</strong> <code>get_interested_users</code> to also be registered</p>
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<p>Called when processing updates to the presence state of one or more users. This callback can
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be used to instruct the server to forward that presence state to specific users. The module
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must return a dictionary that maps from Matrix user IDs (which can be local or remote) to the
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<code>UserPresenceState</code> changes that they should be forwarded.</p>
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<p>Synapse will then attempt to send the specified presence updates to each user when possible.</p>
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<p>If multiple modules implement this callback, Synapse merges all the dictionaries returned
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by the callbacks. If multiple callbacks return a dictionary containing the same key,
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Synapse concatenates the sets associated with this key from each dictionary.</p>
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<h3 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h3>
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<p><em>First introduced in Synapse v1.42.0</em></p>
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<pre><code class="language-python">async def get_interested_users(
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user_id: str
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) -> set[str] | "synapse.module_api.PRESENCE_ALL_USERS"
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</code></pre>
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<p><strong>Requires</strong> <code>get_users_for_states</code> to also be registered</p>
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<p>Called when determining which users someone should be able to see the presence state of. This
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callback should return complementary results to <code>get_users_for_state</code> or the presence information
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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 Iterable
|
||
|
||
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,
|
||
) -> 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>
|
||
|
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