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+ <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>
+<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>
+<h3 id="on_create_room"><a class="header" href="#on_create_room"><code>on_create_room</code></a></h3>
+<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>
+<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>
+<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>
+<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>
+<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>
+<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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