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< h2 style = "color:red" >
This page of the Synapse documentation is now deprecated. For up to date
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documentation on setting up or writing a spam checker module, please see
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< a href = "modules.html" > this page< / a > .
< / h2 >
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< h1 id = "handling-spam-in-synapse" > < a class = "header" href = "#handling-spam-in-synapse" > Handling spam in Synapse< / a > < / h1 >
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< p > Synapse has support to customize spam checking behavior. It can plug into a
variety of events and affect how they are presented to users on your homeserver.< / p >
< p > The spam checking behavior is implemented as a Python class, which must be
able to be imported by the running Synapse.< / p >
< h2 id = "python-spam-checker-class" > < a class = "header" href = "#python-spam-checker-class" > Python spam checker class< / a > < / h2 >
< p > The Python class is instantiated with two objects:< / p >
< ul >
< li > Any configuration (see below).< / li >
< li > An instance of < code > synapse.module_api.ModuleApi< / code > .< / li >
< / ul >
< p > It then implements methods which return a boolean to alter behavior in Synapse.
All the methods must be defined.< / p >
< p > There's a generic method for checking every event (< code > check_event_for_spam< / code > ), as
well as some specific methods:< / p >
< ul >
< li > < code > user_may_invite< / code > < / li >
< li > < code > user_may_create_room< / code > < / li >
< li > < code > user_may_create_room_alias< / code > < / li >
< li > < code > user_may_publish_room< / code > < / li >
< li > < code > check_username_for_spam< / code > < / li >
< li > < code > check_registration_for_spam< / code > < / li >
< li > < code > check_media_file_for_spam< / code > < / li >
< / ul >
< p > The details of each of these methods (as well as their inputs and outputs)
are documented in the < code > synapse.events.spamcheck.SpamChecker< / code > class.< / p >
< p > The < code > ModuleApi< / code > class provides a way for the custom spam checker class to
call back into the homeserver internals.< / p >
< p > Additionally, a < code > parse_config< / code > method is mandatory and receives the plugin config
dictionary. After parsing, It must return an object which will be
passed to < code > __init__< / code > later.< / p >
< h3 id = "example" > < a class = "header" href = "#example" > Example< / a > < / h3 >
< pre > < code class = "language-python" > from synapse.spam_checker_api import RegistrationBehaviour
class ExampleSpamChecker:
def __init__(self, config, api):
self.config = config
self.api = api
@staticmethod
def parse_config(config):
return config
async def check_event_for_spam(self, foo):
return False # allow all events
async def user_may_invite(self, inviter_userid, invitee_userid, room_id):
return True # allow all invites
async def user_may_create_room(self, userid):
return True # allow all room creations
async def user_may_create_room_alias(self, userid, room_alias):
return True # allow all room aliases
async def user_may_publish_room(self, userid, room_id):
return True # allow publishing of all rooms
async def check_username_for_spam(self, user_profile):
return False # allow all usernames
async def check_registration_for_spam(
self,
email_threepid,
username,
request_info,
auth_provider_id,
):
return RegistrationBehaviour.ALLOW # allow all registrations
async def check_media_file_for_spam(self, file_wrapper, file_info):
return False # allow all media
< / code > < / pre >
< h2 id = "configuration" > < a class = "header" href = "#configuration" > Configuration< / a > < / h2 >
< p > Modify the < code > spam_checker< / code > section of your < code > homeserver.yaml< / code > in the following
manner:< / p >
< p > Create a list entry with the keys < code > module< / code > and < code > config< / code > .< / p >
< ul >
< li >
< p > < code > module< / code > should point to the fully qualified Python class that implements your
custom logic, e.g. < code > my_module.ExampleSpamChecker< / code > .< / p >
< / li >
< li >
< p > < code > config< / code > is a dictionary that gets passed to the spam checker class.< / p >
< / li >
< / ul >
< h3 id = "example-1" > < a class = "header" href = "#example-1" > Example< / a > < / h3 >
< p > This section might look like:< / p >
< pre > < code class = "language-yaml" > spam_checker:
- module: my_module.ExampleSpamChecker
config:
# Enable or disable a specific option in ExampleSpamChecker.
my_custom_option: true
< / code > < / pre >
< p > More spam checkers can be added in tandem by appending more items to the list. An
action is blocked when at least one of the configured spam checkers flags it.< / p >
< h2 id = "examples" > < a class = "header" href = "#examples" > Examples< / a > < / h2 >
< p > The < a href = "https://github.com/matrix-org/mjolnir" > Mjolnir< / a > project is a full fledged
example using the Synapse spam checking API, including a bot for dynamic
configuration.< / p >
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