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101 lines
3.1 KiB
Markdown
101 lines
3.1 KiB
Markdown
# Handling spam in Synapse
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Synapse has support to customize spam checking behavior. It can plug into a
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variety of events and affect how they are presented to users on your homeserver.
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The spam checking behavior is implemented as a Python class, which must be
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able to be imported by the running Synapse.
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## Python spam checker class
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The Python class is instantiated with two objects:
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* Any configuration (see below).
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* An instance of `synapse.module_api.ModuleApi`.
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It then implements methods which return a boolean to alter behavior in Synapse.
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There's a generic method for checking every event (`check_event_for_spam`), as
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well as some specific methods:
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* `user_may_invite`
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* `user_may_create_room`
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* `user_may_create_room_alias`
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* `user_may_publish_room`
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* `check_username_for_spam`
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* `check_registration_for_spam`
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The details of each of these methods (as well as their inputs and outputs)
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are documented in the `synapse.events.spamcheck.SpamChecker` class.
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The `ModuleApi` class provides a way for the custom spam checker class to
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call back into the homeserver internals.
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### Example
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```python
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from synapse.spam_checker_api import RegistrationBehaviour
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class ExampleSpamChecker:
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def __init__(self, config, api):
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self.config = config
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self.api = api
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async def check_event_for_spam(self, foo):
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return False # allow all events
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async def user_may_invite(self, inviter_userid, invitee_userid, room_id):
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return True # allow all invites
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async def user_may_create_room(self, userid):
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return True # allow all room creations
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async def user_may_create_room_alias(self, userid, room_alias):
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return True # allow all room aliases
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async def user_may_publish_room(self, userid, room_id):
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return True # allow publishing of all rooms
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async def check_username_for_spam(self, user_profile):
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return False # allow all usernames
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async def check_registration_for_spam(self, email_threepid, username, request_info):
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return RegistrationBehaviour.ALLOW # allow all registrations
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async def check_media_file_for_spam(self, file_wrapper, file_info):
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return False # allow all media
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```
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## Configuration
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Modify the `spam_checker` section of your `homeserver.yaml` in the following
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manner:
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Create a list entry with the keys `module` and `config`.
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* `module` should point to the fully qualified Python class that implements your
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custom logic, e.g. `my_module.ExampleSpamChecker`.
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* `config` is a dictionary that gets passed to the spam checker class.
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### Example
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This section might look like:
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```yaml
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spam_checker:
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- module: my_module.ExampleSpamChecker
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config:
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# Enable or disable a specific option in ExampleSpamChecker.
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my_custom_option: true
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```
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More spam checkers can be added in tandem by appending more items to the list. An
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action is blocked when at least one of the configured spam checkers flags it.
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## Examples
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The [Mjolnir](https://github.com/matrix-org/mjolnir) project is a full fledged
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example using the Synapse spam checking API, including a bot for dynamic
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configuration.
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