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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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