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forked-synapse/synapse/config/server.py

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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2017-2018 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import os.path
import re
from textwrap import indent
import attr
import yaml
from netaddr import IPSet
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.http.endpoint import parse_and_validate_server_name
from synapse.python_dependencies import DependencyException, check_requirements
from ._base import Config, ConfigError
logger = logging.Logger(__name__)
# by default, we attempt to listen on both '::' *and* '0.0.0.0' because some OSes
# (Windows, macOS, other BSD/Linux where net.ipv6.bindv6only is set) will only listen
# on IPv6 when '::' is set.
#
# We later check for errors when binding to 0.0.0.0 and ignore them if :: is also in
# in the list.
DEFAULT_BIND_ADDRESSES = ["::", "0.0.0.0"]
DEFAULT_ROOM_VERSION = "4"
ROOM_COMPLEXITY_TOO_GREAT = (
"Your homeserver is unable to join rooms this large or complex. "
"Please speak to your server administrator, or upgrade your instance "
"to join this room."
)
METRICS_PORT_WARNING = """\
The metrics_port configuration option is deprecated in Synapse 0.31 in favour of
a listener. Please see
https://github.com/matrix-org/synapse/blob/master/docs/metrics-howto.md
on how to configure the new listener.
--------------------------------------------------------------------------------"""
class ServerConfig(Config):
def read_config(self, config, **kwargs):
self.server_name = config["server_name"]
self.server_context = config.get("server_context", None)
try:
parse_and_validate_server_name(self.server_name)
except ValueError as e:
raise ConfigError(str(e))
self.pid_file = self.abspath(config.get("pid_file"))
self.web_client_location = config.get("web_client_location", None)
self.soft_file_limit = config.get("soft_file_limit", 0)
self.daemonize = config.get("daemonize")
self.print_pidfile = config.get("print_pidfile")
self.user_agent_suffix = config.get("user_agent_suffix")
self.use_frozen_dicts = config.get("use_frozen_dicts", False)
self.public_baseurl = config.get("public_baseurl")
# Whether to send federation traffic out in this process. This only
# applies to some federation traffic, and so shouldn't be used to
# "disable" federation
self.send_federation = config.get("send_federation", True)
# Whether to enable user presence.
self.use_presence = config.get("use_presence", True)
# Whether to update the user directory or not. This should be set to
# false only if we are updating the user directory in a worker
self.update_user_directory = config.get("update_user_directory", True)
# whether to enable the media repository endpoints. This should be set
# to false if the media repository is running as a separate endpoint;
# doing so ensures that we will not run cache cleanup jobs on the
# master, potentially causing inconsistency.
self.enable_media_repo = config.get("enable_media_repo", True)
# Whether to require authentication to retrieve profile data (avatars,
# display names) of other users through the client API.
self.require_auth_for_profile_requests = config.get(
"require_auth_for_profile_requests", False
)
if "restrict_public_rooms_to_local_users" in config and (
"allow_public_rooms_without_auth" in config
or "allow_public_rooms_over_federation" in config
):
raise ConfigError(
"Can't use 'restrict_public_rooms_to_local_users' if"
" 'allow_public_rooms_without_auth' and/or"
" 'allow_public_rooms_over_federation' is set."
)
# Check if the legacy "restrict_public_rooms_to_local_users" flag is set. This
# flag is now obsolete but we need to check it for backward-compatibility.
if config.get("restrict_public_rooms_to_local_users", False):
self.allow_public_rooms_without_auth = False
self.allow_public_rooms_over_federation = False
else:
# If set to 'False', requires authentication to access the server's public
# rooms directory through the client API. Defaults to 'True'.
self.allow_public_rooms_without_auth = config.get(
"allow_public_rooms_without_auth", True
)
# If set to 'False', forbids any other homeserver to fetch the server's public
# rooms directory via federation. Defaults to 'True'.
self.allow_public_rooms_over_federation = config.get(
"allow_public_rooms_over_federation", True
)
default_room_version = config.get("default_room_version", DEFAULT_ROOM_VERSION)
# Ensure room version is a str
default_room_version = str(default_room_version)
if default_room_version not in KNOWN_ROOM_VERSIONS:
raise ConfigError(
"Unknown default_room_version: %s, known room versions: %s"
% (default_room_version, list(KNOWN_ROOM_VERSIONS.keys()))
)
# Get the actual room version object rather than just the identifier
self.default_room_version = KNOWN_ROOM_VERSIONS[default_room_version]
# whether to enable search. If disabled, new entries will not be inserted
# into the search tables and they will not be indexed. Users will receive
# errors when attempting to search for messages.
self.enable_search = config.get("enable_search", True)
self.filter_timeline_limit = config.get("filter_timeline_limit", -1)
# Whether we should block invites sent to users on this server
# (other than those sent by local server admins)
self.block_non_admin_invites = config.get("block_non_admin_invites", False)
# Whether to enable experimental MSC1849 (aka relations) support
self.experimental_msc1849_support_enabled = config.get(
"experimental_msc1849_support_enabled", True
)
# Options to control access by tracking MAU
self.limit_usage_by_mau = config.get("limit_usage_by_mau", False)
self.max_mau_value = 0
if self.limit_usage_by_mau:
self.max_mau_value = config.get("max_mau_value", 0)
self.mau_stats_only = config.get("mau_stats_only", False)
self.mau_limits_reserved_threepids = config.get(
"mau_limit_reserved_threepids", []
)
self.mau_trial_days = config.get("mau_trial_days", 0)
# How long to keep redacted events in the database in unredacted form
# before redacting them.
redaction_retention_period = config.get("redaction_retention_period", "7d")
if redaction_retention_period is not None:
self.redaction_retention_period = self.parse_duration(
redaction_retention_period
)
else:
self.redaction_retention_period = None
# How long to keep entries in the `users_ips` table.
user_ips_max_age = config.get("user_ips_max_age", "28d")
if user_ips_max_age is not None:
self.user_ips_max_age = self.parse_duration(user_ips_max_age)
else:
self.user_ips_max_age = None
# Options to disable HS
self.hs_disabled = config.get("hs_disabled", False)
self.hs_disabled_message = config.get("hs_disabled_message", "")
self.hs_disabled_limit_type = config.get("hs_disabled_limit_type", "")
# Admin uri to direct users at should their instance become blocked
# due to resource constraints
self.admin_contact = config.get("admin_contact", None)
# FIXME: federation_domain_whitelist needs sytests
self.federation_domain_whitelist = None
federation_domain_whitelist = config.get("federation_domain_whitelist", None)
if federation_domain_whitelist is not None:
# turn the whitelist into a hash for speed of lookup
self.federation_domain_whitelist = {}
for domain in federation_domain_whitelist:
self.federation_domain_whitelist[domain] = True
self.federation_ip_range_blacklist = config.get(
"federation_ip_range_blacklist", []
)
# Attempt to create an IPSet from the given ranges
try:
self.federation_ip_range_blacklist = IPSet(
self.federation_ip_range_blacklist
)
# Always blacklist 0.0.0.0, ::
self.federation_ip_range_blacklist.update(["0.0.0.0", "::"])
except Exception as e:
raise ConfigError(
"Invalid range(s) provided in " "federation_ip_range_blacklist: %s" % e
)
if self.public_baseurl is not None:
if self.public_baseurl[-1] != "/":
self.public_baseurl += "/"
self.start_pushers = config.get("start_pushers", True)
# (undocumented) option for torturing the worker-mode replication a bit,
# for testing. The value defines the number of milliseconds to pause before
# sending out any replication updates.
self.replication_torture_level = config.get("replication_torture_level")
# Whether to require a user to be in the room to add an alias to it.
# Defaults to True.
self.require_membership_for_aliases = config.get(
"require_membership_for_aliases", True
)
# Whether to allow per-room membership profiles through the send of membership
# events with profile information that differ from the target's global profile.
self.allow_per_room_profiles = config.get("allow_per_room_profiles", True)
self.listeners = []
for listener in config.get("listeners", []):
if not isinstance(listener.get("port", None), int):
raise ConfigError(
"Listener configuration is lacking a valid 'port' option"
)
if listener.setdefault("tls", False):
# no_tls is not really supported any more, but let's grandfather it in
# here.
if config.get("no_tls", False):
logger.info(
"Ignoring TLS-enabled listener on port %i due to no_tls"
)
continue
bind_address = listener.pop("bind_address", None)
bind_addresses = listener.setdefault("bind_addresses", [])
# if bind_address was specified, add it to the list of addresses
if bind_address:
bind_addresses.append(bind_address)
# if we still have an empty list of addresses, use the default list
if not bind_addresses:
if listener["type"] == "metrics":
# the metrics listener doesn't support IPv6
bind_addresses.append("0.0.0.0")
else:
bind_addresses.extend(DEFAULT_BIND_ADDRESSES)
self.listeners.append(listener)
if not self.web_client_location:
_warn_if_webclient_configured(self.listeners)
self.gc_thresholds = read_gc_thresholds(config.get("gc_thresholds", None))
@attr.s
class LimitRemoteRoomsConfig(object):
enabled = attr.ib(
validator=attr.validators.instance_of(bool), default=False
)
complexity = attr.ib(
validator=attr.validators.instance_of((int, float)), default=1.0
)
complexity_error = attr.ib(
validator=attr.validators.instance_of(str),
default=ROOM_COMPLEXITY_TOO_GREAT,
)
self.limit_remote_rooms = LimitRemoteRoomsConfig(
**config.get("limit_remote_rooms", {})
)
bind_port = config.get("bind_port")
if bind_port:
if config.get("no_tls", False):
raise ConfigError("no_tls is incompatible with bind_port")
self.listeners = []
bind_host = config.get("bind_host", "")
gzip_responses = config.get("gzip_responses", True)
self.listeners.append(
{
"port": bind_port,
"bind_addresses": [bind_host],
"tls": True,
"type": "http",
"resources": [
{"names": ["client"], "compress": gzip_responses},
{"names": ["federation"], "compress": False},
],
}
)
unsecure_port = config.get("unsecure_port", bind_port - 400)
if unsecure_port:
self.listeners.append(
{
"port": unsecure_port,
"bind_addresses": [bind_host],
"tls": False,
"type": "http",
"resources": [
{"names": ["client"], "compress": gzip_responses},
{"names": ["federation"], "compress": False},
],
}
)
manhole = config.get("manhole")
if manhole:
self.listeners.append(
{
"port": manhole,
"bind_addresses": ["127.0.0.1"],
"type": "manhole",
"tls": False,
}
)
metrics_port = config.get("metrics_port")
if metrics_port:
logger.warning(METRICS_PORT_WARNING)
self.listeners.append(
{
"port": metrics_port,
"bind_addresses": [config.get("metrics_bind_host", "127.0.0.1")],
"tls": False,
"type": "http",
"resources": [{"names": ["metrics"], "compress": False}],
}
)
_check_resource_config(self.listeners)
self.cleanup_extremities_with_dummy_events = config.get(
"cleanup_extremities_with_dummy_events", True
)
def has_tls_listener(self):
return any(l["tls"] for l in self.listeners)
def generate_config_section(
self, server_name, data_dir_path, open_private_ports, listeners, **kwargs
):
_, bind_port = parse_and_validate_server_name(server_name)
if bind_port is not None:
unsecure_port = bind_port - 400
else:
bind_port = 8448
unsecure_port = 8008
pid_file = os.path.join(data_dir_path, "homeserver.pid")
# Bring DEFAULT_ROOM_VERSION into the local-scope for use in the
# default config string
default_room_version = DEFAULT_ROOM_VERSION
secure_listeners = []
unsecure_listeners = []
private_addresses = ["::1", "127.0.0.1"]
if listeners:
for listener in listeners:
if listener["tls"]:
secure_listeners.append(listener)
else:
# If we don't want open ports we need to bind the listeners
# to some address other than 0.0.0.0. Here we chose to use
# localhost.
# If the addresses are already bound we won't overwrite them
# however.
if not open_private_ports:
listener.setdefault("bind_addresses", private_addresses)
unsecure_listeners.append(listener)
secure_http_bindings = indent(
yaml.dump(secure_listeners), " " * 10
).lstrip()
unsecure_http_bindings = indent(
yaml.dump(unsecure_listeners), " " * 10
).lstrip()
if not unsecure_listeners:
unsecure_http_bindings = (
"""- port: %(unsecure_port)s
tls: false
type: http
x_forwarded: true"""
% locals()
)
if not open_private_ports:
unsecure_http_bindings += (
"\n bind_addresses: ['::1', '127.0.0.1']"
)
unsecure_http_bindings += """
resources:
- names: [client, federation]
compress: false"""
if listeners:
# comment out this block
unsecure_http_bindings = "#" + re.sub(
"\n {10}",
lambda match: match.group(0) + "#",
unsecure_http_bindings,
)
if not secure_listeners:
secure_http_bindings = (
"""#- port: %(bind_port)s
# type: http
# tls: true
# resources:
# - names: [client, federation]"""
% locals()
)
return (
"""\
## Server ##
# The domain name of the server, with optional explicit port.
# This is used by remote servers to connect to this server,
# e.g. matrix.org, localhost:8080, etc.
# This is also the last part of your UserID.
#
server_name: "%(server_name)s"
# When running as a daemon, the file to store the pid in
#
pid_file: %(pid_file)s
# The path to the web client which will be served at /_matrix/client/
# if 'webclient' is configured under the 'listeners' configuration.
#
#web_client_location: "/path/to/web/root"
# The public-facing base URL that clients use to access this HS
# (not including _matrix/...). This is the same URL a user would
# enter into the 'custom HS URL' field on their client. If you
# use synapse with a reverse proxy, this should be the URL to reach
# synapse via the proxy.
#
#public_baseurl: https://example.com/
# Set the soft limit on the number of file descriptors synapse can use
# Zero is used to indicate synapse should set the soft limit to the
# hard limit.
#
#soft_file_limit: 0
# Set to false to disable presence tracking on this homeserver.
#
#use_presence: false
# Whether to require authentication to retrieve profile data (avatars,
# display names) of other users through the client API. Defaults to
# 'false'. Note that profile data is also available via the federation
# API, so this setting is of limited value if federation is enabled on
# the server.
#
#require_auth_for_profile_requests: true
# If set to 'false', requires authentication to access the server's public rooms
# directory through the client API. Defaults to 'true'.
#
#allow_public_rooms_without_auth: false
# If set to 'false', forbids any other homeserver to fetch the server's public
# rooms directory via federation. Defaults to 'true'.
#
#allow_public_rooms_over_federation: false
# The default room version for newly created rooms.
#
# Known room versions are listed here:
# https://matrix.org/docs/spec/#complete-list-of-room-versions
#
# For example, for room version 1, default_room_version should be set
# to "1".
#
#default_room_version: "%(default_room_version)s"
# The GC threshold parameters to pass to `gc.set_threshold`, if defined
#
#gc_thresholds: [700, 10, 10]
# Set the limit on the returned events in the timeline in the get
# and sync operations. The default value is -1, means no upper limit.
#
#filter_timeline_limit: 5000
# Whether room invites to users on this server should be blocked
# (except those sent by local server admins). The default is False.
#
#block_non_admin_invites: True
# Room searching
#
# If disabled, new messages will not be indexed for searching and users
# will receive errors when searching for messages. Defaults to enabled.
#
#enable_search: false
# Restrict federation to the following whitelist of domains.
# N.B. we recommend also firewalling your federation listener to limit
# inbound federation traffic as early as possible, rather than relying
# purely on this application-layer restriction. If not specified, the
# default is to whitelist everything.
#
#federation_domain_whitelist:
# - lon.example.com
# - nyc.example.com
# - syd.example.com
# Prevent federation requests from being sent to the following
# blacklist IP address CIDR ranges. If this option is not specified, or
# specified with an empty list, no ip range blacklist will be enforced.
#
# As of Synapse v1.4.0 this option also affects any outbound requests to identity
# servers provided by user input.
#
# (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
# listed here, since they correspond to unroutable addresses.)
#
federation_ip_range_blacklist:
- '127.0.0.0/8'
- '10.0.0.0/8'
- '172.16.0.0/12'
- '192.168.0.0/16'
- '100.64.0.0/10'
- '169.254.0.0/16'
- '::1/128'
- 'fe80::/64'
- 'fc00::/7'
# List of ports that Synapse should listen on, their purpose and their
# configuration.
#
# Options for each listener include:
#
# port: the TCP port to bind to
#
# bind_addresses: a list of local addresses to listen on. The default is
# 'all local interfaces'.
#
# type: the type of listener. Normally 'http', but other valid options are:
# 'manhole' (see docs/manhole.md),
# 'metrics' (see docs/metrics-howto.md),
# 'replication' (see docs/workers.md).
#
# tls: set to true to enable TLS for this listener. Will use the TLS
# key/cert specified in tls_private_key_path / tls_certificate_path.
#
# x_forwarded: Only valid for an 'http' listener. Set to true to use the
# X-Forwarded-For header as the client IP. Useful when Synapse is
# behind a reverse-proxy.
#
# resources: Only valid for an 'http' listener. A list of resources to host
# on this port. Options for each resource are:
#
# names: a list of names of HTTP resources. See below for a list of
# valid resource names.
#
# compress: set to true to enable HTTP comression for this resource.
#
# additional_resources: Only valid for an 'http' listener. A map of
# additional endpoints which should be loaded via dynamic modules.
#
# Valid resource names are:
#
# client: the client-server API (/_matrix/client), and the synapse admin
# API (/_synapse/admin). Also implies 'media' and 'static'.
#
# consent: user consent forms (/_matrix/consent). See
# docs/consent_tracking.md.
#
# federation: the server-server API (/_matrix/federation). Also implies
# 'media', 'keys', 'openid'
#
# keys: the key discovery API (/_matrix/keys).
#
# media: the media API (/_matrix/media).
#
# metrics: the metrics interface. See docs/metrics-howto.md.
#
# openid: OpenID authentication.
#
# replication: the HTTP replication API (/_synapse/replication). See
# docs/workers.md.
#
# static: static resources under synapse/static (/_matrix/static). (Mostly
# useful for 'fallback authentication'.)
#
# webclient: A web client. Requires web_client_location to be set.
#
listeners:
# TLS-enabled listener: for when matrix traffic is sent directly to synapse.
#
# Disabled by default. To enable it, uncomment the following. (Note that you
# will also need to give Synapse a TLS key and certificate: see the TLS section
# below.)
#
%(secure_http_bindings)s
# Unsecure HTTP listener: for when matrix traffic passes through a reverse proxy
# that unwraps TLS.
#
# If you plan to use a reverse proxy, please see
# https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.md.
#
%(unsecure_http_bindings)s
# example additional_resources:
#
#additional_resources:
# "/_matrix/my/custom/endpoint":
# module: my_module.CustomRequestHandler
# config: {}
# Turn on the twisted ssh manhole service on localhost on the given
# port.
#
#- port: 9000
# bind_addresses: ['::1', '127.0.0.1']
# type: manhole
## Homeserver blocking ##
# How to reach the server admin, used in ResourceLimitError
#
#admin_contact: 'mailto:admin@server.com'
# Global blocking
#
#hs_disabled: False
#hs_disabled_message: 'Human readable reason for why the HS is blocked'
#hs_disabled_limit_type: 'error code(str), to help clients decode reason'
# Monthly Active User Blocking
#
# Used in cases where the admin or server owner wants to limit to the
# number of monthly active users.
#
# 'limit_usage_by_mau' disables/enables monthly active user blocking. When
# anabled and a limit is reached the server returns a 'ResourceLimitError'
# with error type Codes.RESOURCE_LIMIT_EXCEEDED
#
# 'max_mau_value' is the hard limit of monthly active users above which
# the server will start blocking user actions.
#
# 'mau_trial_days' is a means to add a grace period for active users. It
# means that users must be active for this number of days before they
# can be considered active and guards against the case where lots of users
# sign up in a short space of time never to return after their initial
# session.
#
#limit_usage_by_mau: False
#max_mau_value: 50
#mau_trial_days: 2
# If enabled, the metrics for the number of monthly active users will
# be populated, however no one will be limited. If limit_usage_by_mau
# is true, this is implied to be true.
#
#mau_stats_only: False
# Sometimes the server admin will want to ensure certain accounts are
# never blocked by mau checking. These accounts are specified here.
#
#mau_limit_reserved_threepids:
# - medium: 'email'
# address: 'reserved_user@example.com'
# Used by phonehome stats to group together related servers.
#server_context: context
# Resource-constrained Homeserver Settings
#
# If limit_remote_rooms.enabled is True, the room complexity will be
# checked before a user joins a new remote room. If it is above
# limit_remote_rooms.complexity, it will disallow joining or
# instantly leave.
#
# limit_remote_rooms.complexity_error can be set to customise the text
# displayed to the user when a room above the complexity threshold has
# its join cancelled.
#
# Uncomment the below lines to enable:
#limit_remote_rooms:
# enabled: True
# complexity: 1.0
# complexity_error: "This room is too complex."
# Whether to require a user to be in the room to add an alias to it.
# Defaults to 'true'.
#
#require_membership_for_aliases: false
# Whether to allow per-room membership profiles through the send of membership
# events with profile information that differ from the target's global profile.
# Defaults to 'true'.
#
#allow_per_room_profiles: false
# How long to keep redacted events in unredacted form in the database. After
# this period redacted events get replaced with their redacted form in the DB.
#
# Defaults to `7d`. Set to `null` to disable.
#
#redaction_retention_period: 28d
# How long to track users' last seen time and IPs in the database.
#
# Defaults to `28d`. Set to `null` to disable clearing out of old rows.
#
#user_ips_max_age: 14d
"""
% locals()
)
def read_arguments(self, args):
if args.manhole is not None:
self.manhole = args.manhole
if args.daemonize is not None:
self.daemonize = args.daemonize
if args.print_pidfile is not None:
self.print_pidfile = args.print_pidfile
@staticmethod
def add_arguments(parser):
server_group = parser.add_argument_group("server")
server_group.add_argument(
"-D",
"--daemonize",
action="store_true",
default=None,
help="Daemonize the home server",
)
server_group.add_argument(
"--print-pidfile",
action="store_true",
default=None,
help="Print the path to the pidfile just" " before daemonizing",
)
server_group.add_argument(
"--manhole",
metavar="PORT",
dest="manhole",
type=int,
help="Turn on the twisted telnet manhole" " service on the given port.",
)
def is_threepid_reserved(reserved_threepids, threepid):
"""Check the threepid against the reserved threepid config
Args:
reserved_threepids([dict]) - list of reserved threepids
threepid(dict) - The threepid to test for
Returns:
boolean Is the threepid undertest reserved_user
"""
for tp in reserved_threepids:
if threepid["medium"] == tp["medium"] and threepid["address"] == tp["address"]:
return True
return False
def read_gc_thresholds(thresholds):
"""Reads the three integer thresholds for garbage collection. Ensures that
the thresholds are integers if thresholds are supplied.
"""
if thresholds is None:
return None
try:
assert len(thresholds) == 3
return (int(thresholds[0]), int(thresholds[1]), int(thresholds[2]))
except Exception:
raise ConfigError(
"Value of `gc_threshold` must be a list of three integers if set"
)
NO_MORE_WEB_CLIENT_WARNING = """
Synapse no longer includes a web client. To enable a web client, configure
web_client_location. To remove this warning, remove 'webclient' from the 'listeners'
configuration.
"""
def _warn_if_webclient_configured(listeners):
for listener in listeners:
for res in listener.get("resources", []):
for name in res.get("names", []):
if name == "webclient":
logger.warning(NO_MORE_WEB_CLIENT_WARNING)
return
KNOWN_RESOURCES = (
"client",
"consent",
"federation",
"keys",
"media",
"metrics",
"openid",
"replication",
"static",
"webclient",
)
def _check_resource_config(listeners):
resource_names = set(
res_name
for listener in listeners
for res in listener.get("resources", [])
for res_name in res.get("names", [])
)
for resource in resource_names:
if resource not in KNOWN_RESOURCES:
raise ConfigError("Unknown listener resource '%s'" % (resource,))
if resource == "consent":
try:
check_requirements("resources.consent")
except DependencyException as e:
raise ConfigError(e.message)
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