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<h1 id="spam-checker-callbacks"><a class="header" href="#spam-checker-callbacks">Spam checker callbacks</a></h1>
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<p>Spam checker callbacks allow module developers to implement spam mitigation actions for
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Synapse instances. Spam checker callbacks can be registered using the module API's
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<code>register_spam_checker_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 spam checker callbacks are:</p>
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<h3 id="check_event_for_spam"><a class="header" href="#check_event_for_spam"><code>check_event_for_spam</code></a></h3>
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<p><em>First introduced in Synapse v1.37.0</em></p>
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<p><em>Changed in Synapse v1.60.0: <code>synapse.module_api.NOT_SPAM</code> and <code>synapse.module_api.errors.Codes</code> can be returned by this callback. Returning a boolean or a string is now deprecated.</em> </p>
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<pre><code class="language-python">async def check_event_for_spam(event: "synapse.module_api.EventBase") -> Union["synapse.module_api.NOT_SPAM", "synapse.module_api.errors.Codes", str, bool]
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</code></pre>
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<p>Called when receiving an event from a client or via federation. The callback must return one of:</p>
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<ul>
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<li><code>synapse.module_api.NOT_SPAM</code>, to allow the operation. Other callbacks may still
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decide to reject it.</li>
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<li><code>synapse.module_api.errors.Codes</code> to reject the operation with an error code. In case
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of doubt, <code>synapse.module_api.errors.Codes.FORBIDDEN</code> is a good error code.</li>
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<li>(deprecated) a non-<code>Codes</code> <code>str</code> to reject the operation and specify an error message. Note that clients
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typically will not localize the error message to the user's preferred locale.</li>
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<li>(deprecated) <code>False</code>, which is the same as returning <code>synapse.module_api.NOT_SPAM</code>.</li>
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<li>(deprecated) <code>True</code>, which is the same as returning <code>synapse.module_api.errors.Codes.FORBIDDEN</code>.</li>
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</ul>
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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>synapse.module_api.NOT_SPAM</code>, Synapse falls through to the next one.
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The value of the first callback that does not return <code>synapse.module_api.NOT_SPAM</code> will
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be used. If this happens, Synapse will not call any of the subsequent implementations of
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this callback.</p>
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<h3 id="user_may_join_room"><a class="header" href="#user_may_join_room"><code>user_may_join_room</code></a></h3>
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<p><em>First introduced in Synapse v1.37.0</em></p>
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<pre><code class="language-python">async def user_may_join_room(user: str, room: str, is_invited: bool) -> bool
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</code></pre>
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<p>Called when a user is trying to join a room. The module must return a <code>bool</code> to indicate
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whether the user can join the room. Return <code>False</code> to prevent the user from joining the
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room; otherwise return <code>True</code> to permit the joining.</p>
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<p>The user is represented by their Matrix user ID (e.g.
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<code>@alice:example.com</code>) and the room is represented by its Matrix ID (e.g.
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<code>!room:example.com</code>). The module is also given a boolean to indicate whether the user
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currently has a pending invite in the room.</p>
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<p>This callback isn't called if the join is performed by a server administrator, or in the
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context of a room creation.</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="user_may_invite"><a class="header" href="#user_may_invite"><code>user_may_invite</code></a></h3>
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<p><em>First introduced in Synapse v1.37.0</em></p>
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<pre><code class="language-python">async def user_may_invite(inviter: str, invitee: str, room_id: str) -> bool
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</code></pre>
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<p>Called when processing an invitation. The module must return a <code>bool</code> indicating whether
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the inviter can invite the invitee to the given room. Both inviter and invitee are
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represented by their Matrix user ID (e.g. <code>@alice:example.com</code>). Return <code>False</code> to prevent
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the invitation; otherwise return <code>True</code> to permit it.</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="user_may_send_3pid_invite"><a class="header" href="#user_may_send_3pid_invite"><code>user_may_send_3pid_invite</code></a></h3>
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<p><em>First introduced in Synapse v1.45.0</em></p>
|
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<pre><code class="language-python">async def user_may_send_3pid_invite(
|
|
inviter: str,
|
|
medium: str,
|
|
address: str,
|
|
room_id: str,
|
|
) -> bool
|
|
</code></pre>
|
|
<p>Called when processing an invitation using a third-party identifier (also called a 3PID,
|
|
e.g. an email address or a phone number). The module must return a <code>bool</code> indicating
|
|
whether the inviter can invite the invitee to the given room. Return <code>False</code> to prevent
|
|
the invitation; otherwise return <code>True</code> to permit it.</p>
|
|
<p>The inviter is represented by their Matrix user ID (e.g. <code>@alice:example.com</code>), and the
|
|
invitee is represented by its medium (e.g. "email") and its address
|
|
(e.g. <code>alice@example.com</code>). See <a href="https://matrix.org/docs/spec/appendices#pid-types">the Matrix specification</a>
|
|
for more information regarding third-party identifiers.</p>
|
|
<p>For example, a call to this callback to send an invitation to the email address
|
|
<code>alice@example.com</code> would look like this:</p>
|
|
<pre><code class="language-python">await user_may_send_3pid_invite(
|
|
"@bob:example.com", # The inviter's user ID
|
|
"email", # The medium of the 3PID to invite
|
|
"alice@example.com", # The address of the 3PID to invite
|
|
"!some_room:example.com", # The ID of the room to send the invite into
|
|
)
|
|
</code></pre>
|
|
<p><strong>Note</strong>: If the third-party identifier is already associated with a matrix user ID,
|
|
<a href="#user_may_invite"><code>user_may_invite</code></a> will be used instead.</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="user_may_create_room"><a class="header" href="#user_may_create_room"><code>user_may_create_room</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def user_may_create_room(user: str) -> bool
|
|
</code></pre>
|
|
<p>Called when processing a room creation request. The module must return a <code>bool</code> indicating
|
|
whether the given user (represented by their Matrix user ID) is allowed to create a room.
|
|
Return <code>False</code> to prevent room creation; otherwise return <code>True</code> to permit it.</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="user_may_create_room_alias"><a class="header" href="#user_may_create_room_alias"><code>user_may_create_room_alias</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def user_may_create_room_alias(user: str, room_alias: "synapse.types.RoomAlias") -> bool
|
|
</code></pre>
|
|
<p>Called when trying to associate an alias with an existing room. The module must return a
|
|
<code>bool</code> indicating whether the given user (represented by their Matrix user ID) is allowed
|
|
to set the given alias. Return <code>False</code> to prevent the alias creation; otherwise return
|
|
<code>True</code> to permit it.</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="user_may_publish_room"><a class="header" href="#user_may_publish_room"><code>user_may_publish_room</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def user_may_publish_room(user: str, room_id: str) -> bool
|
|
</code></pre>
|
|
<p>Called when trying to publish a room to the homeserver's public rooms directory. The
|
|
module must return a <code>bool</code> indicating whether the given user (represented by their
|
|
Matrix user ID) is allowed to publish the given room. Return <code>False</code> to prevent the
|
|
room from being published; otherwise return <code>True</code> to permit its publication.</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="check_username_for_spam"><a class="header" href="#check_username_for_spam"><code>check_username_for_spam</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def check_username_for_spam(user_profile: synapse.module_api.UserProfile) -> bool
|
|
</code></pre>
|
|
<p>Called when computing search results in the user directory. The module must return a
|
|
<code>bool</code> indicating whether the given user should be excluded from user directory
|
|
searches. Return <code>True</code> to indicate that the user is spammy and exclude them from
|
|
search results; otherwise return <code>False</code>.</p>
|
|
<p>The profile is represented as a dictionary with the following keys:</p>
|
|
<ul>
|
|
<li><code>user_id: str</code>. The Matrix ID for this user.</li>
|
|
<li><code>display_name: Optional[str]</code>. The user's display name, or <code>None</code> if this user
|
|
has not set a display name.</li>
|
|
<li><code>avatar_url: Optional[str]</code>. The <code>mxc://</code> URL to the user's avatar, or <code>None</code>
|
|
if this user has not set an avatar.</li>
|
|
</ul>
|
|
<p>The module is given a copy of the original dictionary, so modifying it from within the
|
|
module cannot modify a user's profile when included in user directory search results.</p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>False</code> will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.</p>
|
|
<h3 id="check_registration_for_spam"><a class="header" href="#check_registration_for_spam"><code>check_registration_for_spam</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def check_registration_for_spam(
|
|
email_threepid: Optional[dict],
|
|
username: Optional[str],
|
|
request_info: Collection[Tuple[str, str]],
|
|
auth_provider_id: Optional[str] = None,
|
|
) -> "synapse.spam_checker_api.RegistrationBehaviour"
|
|
</code></pre>
|
|
<p>Called when registering a new user. The module must return a <code>RegistrationBehaviour</code>
|
|
indicating whether the registration can go through or must be denied, or whether the user
|
|
may be allowed to register but will be shadow banned.</p>
|
|
<p>The arguments passed to this callback are:</p>
|
|
<ul>
|
|
<li><code>email_threepid</code>: The email address used for registering, if any.</li>
|
|
<li><code>username</code>: The username the user would like to register. Can be <code>None</code>, meaning that
|
|
Synapse will generate one later.</li>
|
|
<li><code>request_info</code>: A collection of tuples, which first item is a user agent, and which
|
|
second item is an IP address. These user agents and IP addresses are the ones that were
|
|
used during the registration process.</li>
|
|
<li><code>auth_provider_id</code>: The identifier of the SSO authentication provider, if any.</li>
|
|
</ul>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>RegistrationBehaviour.ALLOW</code>, Synapse falls through to the next one.
|
|
The value of the first callback that does not return <code>RegistrationBehaviour.ALLOW</code> will
|
|
be used. If this happens, Synapse will not call any of the subsequent implementations of
|
|
this callback.</p>
|
|
<h3 id="check_media_file_for_spam"><a class="header" href="#check_media_file_for_spam"><code>check_media_file_for_spam</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.37.0</em></p>
|
|
<pre><code class="language-python">async def check_media_file_for_spam(
|
|
file_wrapper: "synapse.rest.media.v1.media_storage.ReadableFileWrapper",
|
|
file_info: "synapse.rest.media.v1._base.FileInfo",
|
|
) -> bool
|
|
</code></pre>
|
|
<p>Called when storing a local or remote file. The module must return a <code>bool</code> indicating
|
|
whether the given file should be excluded from the homeserver's media store. Return
|
|
<code>True</code> to prevent this file from being stored; otherwise return <code>False</code>.</p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>False</code> will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.</p>
|
|
<h3 id="should_drop_federated_event"><a class="header" href="#should_drop_federated_event"><code>should_drop_federated_event</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.60.0</em></p>
|
|
<pre><code class="language-python">async def should_drop_federated_event(event: "synapse.events.EventBase") -> bool
|
|
</code></pre>
|
|
<p>Called when checking whether a remote server can federate an event with us. <strong>Returning
|
|
<code>True</code> from this function will silently drop a federated event and split-brain our view
|
|
of a room's DAG, and thus you shouldn't use this callback unless you know what you are
|
|
doing.</strong></p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>False</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>False</code> will be used. If this happens, Synapse will 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 the spam checker callback
|
|
<code>check_event_for_spam</code> to deny any message sent by users whose Matrix user IDs are
|
|
mentioned in a configured list, and registers a web resource to the path
|
|
<code>/_synapse/client/list_spam_checker/is_evil</code> that returns a JSON object indicating
|
|
whether the provided user appears in that list.</p>
|
|
<pre><code class="language-python">import json
|
|
from typing import Union
|
|
|
|
from twisted.web.resource import Resource
|
|
from twisted.web.server import Request
|
|
|
|
from synapse.module_api import ModuleApi
|
|
|
|
|
|
class IsUserEvilResource(Resource):
|
|
def __init__(self, config):
|
|
super(IsUserEvilResource, self).__init__()
|
|
self.evil_users = config.get("evil_users") or []
|
|
|
|
def render_GET(self, request: Request):
|
|
user = request.args.get(b"user")[0].decode()
|
|
request.setHeader(b"Content-Type", b"application/json")
|
|
return json.dumps({"evil": user in self.evil_users}).encode()
|
|
|
|
|
|
class ListSpamChecker:
|
|
def __init__(self, config: dict, api: ModuleApi):
|
|
self.api = api
|
|
self.evil_users = config.get("evil_users") or []
|
|
|
|
self.api.register_spam_checker_callbacks(
|
|
check_event_for_spam=self.check_event_for_spam,
|
|
)
|
|
|
|
self.api.register_web_resource(
|
|
path="/_synapse/client/list_spam_checker/is_evil",
|
|
resource=IsUserEvilResource(config),
|
|
)
|
|
|
|
async def check_event_for_spam(self, event: "synapse.events.EventBase") -> Union[bool, str]:
|
|
return event.sender not in self.evil_users
|
|
</code></pre>
|
|
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