mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-23 02:35:36 +00:00
282 lines
11 KiB
Markdown
282 lines
11 KiB
Markdown
# Spam checker callbacks
|
|
|
|
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
|
|
`register_spam_checker_callbacks` method.
|
|
|
|
## Callbacks
|
|
|
|
The available spam checker callbacks are:
|
|
|
|
### `check_event_for_spam`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def check_event_for_spam(event: "synapse.events.EventBase") -> Union[bool, str]
|
|
```
|
|
|
|
Called when receiving an event from a client or via federation. The module can return
|
|
either a `bool` to indicate whether the event must be rejected because of spam, or a `str`
|
|
to indicate the event must be rejected because of spam and to give a rejection reason to
|
|
forward to clients.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `False`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `False` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_join_room`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def user_may_join_room(user: str, room: str, is_invited: bool) -> bool
|
|
```
|
|
|
|
Called when a user is trying to join a room. The module must return a `bool` to indicate
|
|
whether the user can join the room. The user is represented by their Matrix user ID (e.g.
|
|
`@alice:example.com`) and the room is represented by its Matrix ID (e.g.
|
|
`!room:example.com`). The module is also given a boolean to indicate whether the user
|
|
currently has a pending invite in the room.
|
|
|
|
This callback isn't called if the join is performed by a server administrator, or in the
|
|
context of a room creation.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_invite`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def user_may_invite(inviter: str, invitee: str, room_id: str) -> bool
|
|
```
|
|
|
|
Called when processing an invitation. The module must return a `bool` 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. `@alice:example.com`).
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_send_3pid_invite`
|
|
|
|
_First introduced in Synapse v1.45.0_
|
|
|
|
```python
|
|
async def user_may_send_3pid_invite(
|
|
inviter: str,
|
|
medium: str,
|
|
address: str,
|
|
room_id: str,
|
|
) -> bool
|
|
```
|
|
|
|
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 `bool` indicating
|
|
whether the inviter can invite the invitee to the given room.
|
|
|
|
The inviter is represented by their Matrix user ID (e.g. `@alice:example.com`), and the
|
|
invitee is represented by its medium (e.g. "email") and its address
|
|
(e.g. `alice@example.com`). See [the Matrix specification](https://matrix.org/docs/spec/appendices#pid-types)
|
|
for more information regarding third-party identifiers.
|
|
|
|
For example, a call to this callback to send an invitation to the email address
|
|
`alice@example.com` would look like this:
|
|
|
|
```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
|
|
)
|
|
```
|
|
|
|
**Note**: If the third-party identifier is already associated with a matrix user ID,
|
|
[`user_may_invite`](#user_may_invite) will be used instead.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_create_room`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def user_may_create_room(user: str) -> bool
|
|
```
|
|
|
|
Called when processing a room creation request. The module must return a `bool` indicating
|
|
whether the given user (represented by their Matrix user ID) is allowed to create a room.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_create_room_alias`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def user_may_create_room_alias(user: str, room_alias: "synapse.types.RoomAlias") -> bool
|
|
```
|
|
|
|
Called when trying to associate an alias with an existing room. The module must return a
|
|
`bool` indicating whether the given user (represented by their Matrix user ID) is allowed
|
|
to set the given alias.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `user_may_publish_room`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def user_may_publish_room(user: str, room_id: str) -> bool
|
|
```
|
|
|
|
Called when trying to publish a room to the homeserver's public rooms directory. The
|
|
module must return a `bool` indicating whether the given user (represented by their
|
|
Matrix user ID) is allowed to publish the given room.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `True`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `True` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `check_username_for_spam`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```python
|
|
async def check_username_for_spam(user_profile: Dict[str, str]) -> bool
|
|
```
|
|
|
|
Called when computing search results in the user directory. The module must return a
|
|
`bool` indicating whether the given user profile can appear in search results. The profile
|
|
is represented as a dictionary with the following keys:
|
|
|
|
* `user_id`: The Matrix ID for this user.
|
|
* `display_name`: The user's display name.
|
|
* `avatar_url`: The `mxc://` URL to the user's avatar.
|
|
|
|
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.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `False`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `False` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
### `check_registration_for_spam`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```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"
|
|
```
|
|
|
|
Called when registering a new user. The module must return a `RegistrationBehaviour`
|
|
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.
|
|
|
|
The arguments passed to this callback are:
|
|
|
|
* `email_threepid`: The email address used for registering, if any.
|
|
* `username`: The username the user would like to register. Can be `None`, meaning that
|
|
Synapse will generate one later.
|
|
* `request_info`: 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.
|
|
* `auth_provider_id`: The identifier of the SSO authentication provider, if any.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `RegistrationBehaviour.ALLOW`, Synapse falls through to the next one.
|
|
The value of the first callback that does not return `RegistrationBehaviour.ALLOW` will
|
|
be used. If this happens, Synapse will not call any of the subsequent implementations of
|
|
this callback.
|
|
|
|
### `check_media_file_for_spam`
|
|
|
|
_First introduced in Synapse v1.37.0_
|
|
|
|
```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
|
|
```
|
|
|
|
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.
|
|
|
|
If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns `False`, Synapse falls through to the next one. The value of the first
|
|
callback that does not return `False` will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.
|
|
|
|
## Example
|
|
|
|
The example below is a module that implements the spam checker callback
|
|
`check_event_for_spam` 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
|
|
`/_synapse/client/list_spam_checker/is_evil` that returns a JSON object indicating
|
|
whether the provided user appears in that list.
|
|
|
|
```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
|
|
```
|