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< h1 id = "spam-checker-callbacks" > < a class = "header" href = "#spam-checker-callbacks" > Spam checker callbacks< / a > < / h1 >
< p > Spam checker callbacks allow module developers to implement spam mitigation actions for
Synapse instances. Spam checker callbacks can be registered using the module API's
< code > register_spam_checker_callbacks< / code > method.< / p >
< h2 id = "callbacks" > < a class = "header" href = "#callbacks" > Callbacks< / a > < / h2 >
< p > The available spam checker callbacks are:< / p >
< h3 id = "check_event_for_spam" > < a class = "header" href = "#check_event_for_spam" > < code > check_event_for_spam< / code > < / a > < / h3 >
< p > < em > First introduced in Synapse v1.37.0< / em > < / p >
< 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 >
< 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]
< / code > < / pre >
< p > Called when receiving an event from a client or via federation. The callback must return one of:< / p >
< ul >
< li > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / li >
< li > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / li >
< li > (deprecated) a non-< code > Codes< / code > < code > str< / code > to reject the operation and specify an error message. Note that clients
typically will not localize the error message to the user's preferred locale.< / li >
< li > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / li >
< li > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / code > will
be used. If this happens, Synapse will not call any of the subsequent implementations of
this callback.< / p >
< h3 id = "user_may_join_room" > < a class = "header" href = "#user_may_join_room" > < code > user_may_join_room< / code > < / a > < / h3 >
< p > < em > First introduced in Synapse v1.37.0< / em > < / p >
< p > < em > Changed in Synapse v1.61.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_join_room(user: str, room: str, is_invited: bool) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when a user is trying to join a room. The user is represented by their Matrix user ID (e.g.
< code > @alice:example.com< / code > ) and the room is represented by its Matrix ID (e.g.
< code > !room:example.com< / code > ). The module is also given a boolean to indicate whether the user
currently has a pending invite in the room.< / p >
< p > This callback isn't called if the join is performed by a server administrator, or in the
context of a room creation.< / p >
< p > The callback must return one of:< / p >
< ul >
< li > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / li >
< li > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / li >
< li > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / li >
< li > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / code > will
be used. If this happens, Synapse will not call any of the subsequent implementations of
this callback.< / p >
< h3 id = "user_may_invite" > < a class = "header" href = "#user_may_invite" > < code > user_may_invite< / code > < / a > < / h3 >
< p > < em > First introduced in Synapse v1.37.0< / em > < / p >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_invite(inviter: str, invitee: str, room_id: str) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when processing an invitation. Both inviter and invitee are
represented by their Matrix user ID (e.g. < code > @alice:example.com< / code > ).< / p >
< p > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / code > will
be used. If this happens, Synapse will not call any of the subsequent implementations of
this callback.< / p >
< 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 >
< p > < em > First introduced in Synapse v1.45.0< / em > < / p >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_send_3pid_invite(
inviter: str,
medium: str,
address: str,
room_id: str,
) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , 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). < / 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 > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / 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 >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_create_room(user_id: str) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when processing a room creation request.< / p >
< p > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / 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 >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_create_room_alias(user_id: str, room_alias: " synapse.module_api.RoomAlias" ) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when trying to associate an alias with an existing room.< / p >
< p > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / 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 >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def user_may_publish_room(user_id: str, room_id: str) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when trying to publish a room to the homeserver's public rooms directory.< / p >
< p > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / 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 >
< p > < em > Changed in Synapse v1.62.0: < code > synapse.module_api.NOT_SPAM< / code > and < code > synapse.module_api.errors.Codes< / code > can be returned by this callback. Returning a boolean is now deprecated.< / em > < / p >
< pre > < code class = "language-python" > async def check_media_file_for_spam(
file_wrapper: " synapse.media.media_storage.ReadableFileWrapper" ,
file_info: " synapse.media._base.FileInfo" ,
) -> Union[" synapse.module_api.NOT_SPAM" , " synapse.module_api.errors.Codes" , bool]
< / code > < / pre >
< p > Called when storing a local or remote file.< / p >
< p > The callback must return one of:< / p >
< ul >
< li >
< p > < code > synapse.module_api.NOT_SPAM< / code > , to allow the operation. Other callbacks may still
decide to reject it.< / p >
< / li >
< li >
< p > < code > synapse.module_api.errors.Codes< / code > to reject the operation with an error code. In case
of doubt, < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > is a good error code.< / p >
< / li >
< li >
< p > (deprecated) < code > False< / code > , which is the same as returning < code > synapse.module_api.NOT_SPAM< / code > .< / p >
< / li >
< li >
< p > (deprecated) < code > True< / code > , which is the same as returning < code > synapse.module_api.errors.Codes.FORBIDDEN< / code > .< / p >
< / li >
< / ul >
< p > If multiple modules implement this callback, they will be considered in order. If a
callback returns < code > synapse.module_api.NOT_SPAM< / code > , Synapse falls through to the next one.
The value of the first callback that does not return < code > synapse.module_api.NOT_SPAM< / 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[Literal[" NOT_SPAM" ], Codes]:
if event.sender in self.evil_users:
return Codes.FORBIDDEN
else:
return synapse.module_api.NOT_SPAM
< / code > < / pre >
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