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<h1 id="third-party-rules-callbacks"><a class="header" href="#third-party-rules-callbacks">Third party rules callbacks</a></h1>
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<p>Third party rules callbacks allow module developers to add extra checks to verify the
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validity of incoming events. Third party event rules callbacks can be registered using
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the module API's <code>register_third_party_rules_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 third party rules callbacks are:</p>
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<h3 id="check_event_allowed"><a class="header" href="#check_event_allowed"><code>check_event_allowed</code></a></h3>
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<p><em>First introduced in Synapse v1.39.0</em></p>
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<pre><code class="language-python">async def check_event_allowed(
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event: "synapse.events.EventBase",
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state_events: "synapse.types.StateMap",
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) -> Tuple[bool, Optional[dict]]
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</code></pre>
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<p><strong><span style="color:red">
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This callback is very experimental and can and will break without notice. Module developers
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are encouraged to implement <code>check_event_for_spam</code> from the spam checker category instead.
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</span></strong></p>
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<p>Called when processing any incoming event, with the event and a <code>StateMap</code>
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representing the current state of the room the event is being sent into. A <code>StateMap</code> is
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a dictionary that maps tuples containing an event type and a state key to the
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corresponding state event. For example retrieving the room's <code>m.room.create</code> event from
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the <code>state_events</code> argument would look like this: <code>state_events.get(("m.room.create", ""))</code>.
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The module must return a boolean indicating whether the event can be allowed.</p>
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<p>Note that this callback function processes incoming events coming via federation
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traffic (on top of client traffic). This means denying an event might cause the local
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copy of the room's history to diverge from that of remote servers. This may cause
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federation issues in the room. It is strongly recommended to only deny events using this
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callback function if the sender is a local user, or in a private federation in which all
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servers are using the same module, with the same configuration.</p>
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<p>If the boolean returned by the module is <code>True</code>, it may also tell Synapse to replace the
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event with new data by returning the new event's data as a dictionary. In order to do
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that, it is recommended the module calls <code>event.get_dict()</code> to get the current event as a
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dictionary, and modify the returned dictionary accordingly.</p>
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<p>If <code>check_event_allowed</code> raises an exception, the module is assumed to have failed.
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The event will not be accepted but is not treated as explicitly rejected, either.
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An HTTP request causing the module check will likely result in a 500 Internal
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Server Error.</p>
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<p>When the boolean returned by the module is <code>False</code>, the event is rejected.
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(Module developers should not use exceptions for rejection.)</p>
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<p>Note that replacing the event only works for events sent by local users, not for events
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received over federation.</p>
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<p>If multiple modules implement this callback, they will be considered in order. If a
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callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
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callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
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any of the subsequent implementations of this callback.</p>
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<h3 id="on_create_room"><a class="header" href="#on_create_room"><code>on_create_room</code></a></h3>
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<p><em>First introduced in Synapse v1.39.0</em></p>
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<pre><code class="language-python">async def on_create_room(
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requester: "synapse.types.Requester",
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request_content: dict,
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is_requester_admin: bool,
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) -> None
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</code></pre>
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<p>Called when processing a room creation request, with the <code>Requester</code> object for the user
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performing the request, a dictionary representing the room creation request's JSON body
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(see <a href="https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-createroom">the spec</a>
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for a list of possible parameters), and a boolean indicating whether the user performing
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the request is a server admin.</p>
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<p>Modules can modify the <code>request_content</code> (by e.g. adding events to its <code>initial_state</code>),
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or deny the room's creation by raising a <code>module_api.errors.SynapseError</code>.</p>
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<p>If multiple modules implement this callback, they will be considered in order. If a
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callback returns without raising an exception, Synapse falls through to the next one. The
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room creation will be forbidden as soon as one of the callbacks raises an exception. If
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this happens, Synapse will not call any of the subsequent implementations of this
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callback.</p>
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<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>
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<p><em>First introduced in Synapse v1.39.0</em></p>
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<pre><code class="language-python">async def check_threepid_can_be_invited(
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medium: str,
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address: str,
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state_events: "synapse.types.StateMap",
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) -> bool:
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</code></pre>
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<p>Called when processing an invite via a third-party identifier (i.e. email or phone number).
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The module must return a boolean indicating whether the invite can go through.</p>
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<p>If multiple modules implement this callback, they will be considered in order. If a
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callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
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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>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>
|
|
|
|
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