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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 >
< pre > < code class = "language-python" > async def check_event_for_spam(event: " synapse.events.EventBase" ) -> Union[bool, str]
< / code > < / pre >
< p > Called when receiving an event from a client or via federation. The module can return
either a < code > bool< / code > to indicate whether the event must be rejected because of spam, or a < code > str< / code >
to indicate the event must be rejected because of spam and to give a rejection reason to
forward to clients.< / p >
< h3 id = "user_may_invite" > < a class = "header" href = "#user_may_invite" > < code > user_may_invite< / code > < / a > < / h3 >
< pre > < code class = "language-python" > async def user_may_invite(inviter: str, invitee: str, room_id: str) -> bool
< / code > < / pre >
< p > Called when processing an invitation. The module must return a < code > bool< / code > indicating whether
the inviter can invite the invitee to the given room. Both inviter and invitee are
represented by their Matrix user ID (e.g. < code > @alice:example.com< / code > ).< / p >
< h3 id = "user_may_create_room" > < a class = "header" href = "#user_may_create_room" > < code > user_may_create_room< / code > < / a > < / h3 >
< 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.< / p >
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< h3 id = "user_may_create_room_with_invites" > < a class = "header" href = "#user_may_create_room_with_invites" > < code > user_may_create_room_with_invites< / code > < / a > < / h3 >
< pre > < code class = "language-python" > async def user_may_create_room_with_invites(
user: str,
invites: List[str],
threepid_invites: List[Dict[str, str]],
) -> bool
< / code > < / pre >
< p > Called when processing a room creation request (right after < code > user_may_create_room< / code > ).
The module is given the Matrix user ID of the user trying to create a room, as well as a
list of Matrix users to invite and a list of third-party identifiers (3PID, e.g. email
addresses) to invite.< / p >
< p > An invited Matrix user to invite is represented by their Matrix user IDs, and an invited
3PIDs is represented by a dict that includes the 3PID medium (e.g. " email" ) through its
< code > medium< / code > key and its address (e.g. " alice@example.com" ) through its < code > address< / code > key.< / p >
< p > See < a href = "https://matrix.org/docs/spec/appendices#pid-types" > the Matrix specification< / a > for more
information regarding third-party identifiers.< / p >
< p > If no invite and/or 3PID invite were specified in the room creation request, the
corresponding list(s) will be empty.< / p >
< p > < strong > Note< / strong > : This callback is not called when a room is cloned (e.g. during a room upgrade)
since no invites are sent when cloning a room. To cover this case, modules also need to
implement < code > user_may_create_room< / code > .< / p >
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< 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 >
< 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.< / p >
< h3 id = "user_may_publish_room" > < a class = "header" href = "#user_may_publish_room" > < code > user_may_publish_room< / code > < / a > < / h3 >
< 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.< / p >
< h3 id = "check_username_for_spam" > < a class = "header" href = "#check_username_for_spam" > < code > check_username_for_spam< / code > < / a > < / h3 >
< pre > < code class = "language-python" > async def check_username_for_spam(user_profile: Dict[str, str]) -> 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 profile can appear in search results. The profile
is represented as a dictionary with the following keys:< / p >
< ul >
< li > < code > user_id< / code > : The Matrix ID for this user.< / li >
< li > < code > display_name< / code > : The user's display name.< / li >
< li > < code > avatar_url< / code > : The < code > mxc://< / code > URL to the user's 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 >
< h3 id = "check_registration_for_spam" > < a class = "header" href = "#check_registration_for_spam" > < code > check_registration_for_spam< / code > < / a > < / h3 >
< 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 >
< 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 >
< 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 boolean indicating
whether the given file can be stored in the homeserver's media store.< / 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):
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user = request.args.get(b" user" )[0].decode()
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request.setHeader(b" Content-Type" , b" application/json" )
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return json.dumps({" evil" : user in self.evil_users}).encode()
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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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