# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""Implementation of the default settings.
"""
import typing
import numbers
import errno
import os
import logging
from base64 import b64decode
from os.path import dirname, abspath
from .sxng_locales import sxng_locales
searx_dir = abspath(dirname(__file__))
logger = logging.getLogger('searx')
OUTPUT_FORMATS = ['html', 'csv', 'json', 'rss']
SXNG_LOCALE_TAGS = ['all', 'auto'] + list(l[0] for l in sxng_locales)
SIMPLE_STYLE = ('auto', 'light', 'dark')
CATEGORIES_AS_TABS = {
'general': {},
'images': {},
'videos': {},
'news': {},
'map': {},
'music': {},
'it': {},
'science': {},
'files': {},
'social media': {},
}
STR_TO_BOOL = {
'0': False,
'false': False,
'off': False,
'1': True,
'true': True,
'on': True,
}
_UNDEFINED = object()
class SettingsValue:
"""Check and update a setting value"""
def __init__(
self,
type_definition: typing.Union[None, typing.Any, typing.Tuple[typing.Any]] = None,
default: typing.Any = None,
environ_name: str = None,
):
self.type_definition = (
type_definition if type_definition is None or isinstance(type_definition, tuple) else (type_definition,)
)
self.default = default
self.environ_name = environ_name
@property
def type_definition_repr(self):
types_str = [t.__name__ if isinstance(t, type) else repr(t) for t in self.type_definition]
return ', '.join(types_str)
def check_type_definition(self, value: typing.Any) -> None:
if value in self.type_definition:
return
type_list = tuple(t for t in self.type_definition if isinstance(t, type))
if not isinstance(value, type_list):
raise ValueError('The value has to be one of these types/values: {}'.format(self.type_definition_repr))
def __call__(self, value: typing.Any) -> typing.Any:
if value == _UNDEFINED:
value = self.default
# override existing value with environ
if self.environ_name and self.environ_name in os.environ:
value = os.environ[self.environ_name]
if self.type_definition == (bool,):
value = STR_TO_BOOL[value.lower()]
self.check_type_definition(value)
return value
class SettingSublistValue(SettingsValue):
"""Check the value is a sublist of type definition."""
def check_type_definition(self, value: typing.Any) -> typing.Any:
if not isinstance(value, list):
raise ValueError('The value has to a list')
for item in value:
if not item in self.type_definition[0]:
raise ValueError('{} not in {}'.format(item, self.type_definition))
class SettingsDirectoryValue(SettingsValue):
"""Check and update a setting value that is a directory path"""
def check_type_definition(self, value: typing.Any) -> typing.Any:
super().check_type_definition(value)
if not os.path.isdir(value):
raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), value)
def __call__(self, value: typing.Any) -> typing.Any:
if value == '':
value = self.default
return super().__call__(value)
class SettingsBytesValue(SettingsValue):
"""str are base64 decoded"""
def __call__(self, value: typing.Any) -> typing.Any:
if isinstance(value, str):
value = b64decode(value)
return super().__call__(value)
def apply_schema(settings, schema, path_list):
error = False
for key, value in schema.items():
if isinstance(value, SettingsValue):
try:
settings[key] = value(settings.get(key, _UNDEFINED))
except Exception as e: # pylint: disable=broad-except
# don't stop now: check other values
logger.error('%s: %s', '.'.join([*path_list, key]), e)
error = True
elif isinstance(value, dict):
error = error or apply_schema(settings.setdefault(key, {}), schema[key], [*path_list, key])
else:
settings.setdefault(key, value)
if len(path_list) == 0 and error:
raise ValueError('Invalid settings.yml')
return error
SCHEMA = {
'general': {
'debug': SettingsValue(bool, False, 'SEARXNG_DEBUG'),
'instance_name': SettingsValue(str, 'SearXNG'),
'privacypolicy_url': SettingsValue((None, False, str), None),
'contact_url': SettingsValue((None, False, str), None),
'donation_url': SettingsValue((bool, str), "https://docs.searxng.org/donate.html"),
'enable_metrics': SettingsValue(bool, True),
},
'brand': {
'issue_url': SettingsValue(str, 'https://github.com/searxng/searxng/issues'),
'new_issue_url': SettingsValue(str, 'https://github.com/searxng/searxng/issues/new'),
'docs_url': SettingsValue(str, 'https://docs.searxng.org'),
'public_instances': SettingsValue((False, str), 'https://searx.space'),
'wiki_url': SettingsValue(str, 'https://github.com/searxng/searxng/wiki'),
'custom': SettingsValue(dict, {'links': {}}),
},
'search': {
'safe_search': SettingsValue((0, 1, 2), 0),
'autocomplete': SettingsValue(str, ''),
'autocomplete_min': SettingsValue(int, 4),
'default_lang': SettingsValue(tuple(SXNG_LOCALE_TAGS + ['']), ''),
'languages': SettingSublistValue(SXNG_LOCALE_TAGS, SXNG_LOCALE_TAGS),
'ban_time_on_fail': SettingsValue(numbers.Real, 5),
'max_ban_time_on_fail': SettingsValue(numbers.Real, 120),
'suspended_times': {
'SearxEngineAccessDenied': SettingsValue(numbers.Real, 86400),
'SearxEngineCaptcha': SettingsValue(numbers.Real, 86400),
'SearxEngineTooManyRequests': SettingsValue(numbers.Real, 3600),
'cf_SearxEngineCaptcha': SettingsValue(numbers.Real, 1296000),
'cf_SearxEngineAccessDenied': SettingsValue(numbers.Real, 86400),
'recaptcha_SearxEngineCaptcha': SettingsValue(numbers.Real, 604800),
},
'formats': SettingsValue(list, OUTPUT_FORMATS),
'max_page': SettingsValue(int, 0),
},
'server': {
'port': SettingsValue((int, str), 8888, 'SEARXNG_PORT'),
'bind_address': SettingsValue(str, '127.0.0.1', 'SEARXNG_BIND_ADDRESS'),
'limiter': SettingsValue(bool, False),
'public_instance': SettingsValue(bool, False),
'secret_key': SettingsValue(str, environ_name='SEARXNG_SECRET'),
'base_url': SettingsValue((False, str), False, 'SEARXNG_BASE_URL'),
'image_proxy': SettingsValue(bool, False),
'http_protocol_version': SettingsValue(('1.0', '1.1'), '1.0'),
'method': SettingsValue(('POST', 'GET'), 'POST'),
'default_http_headers': SettingsValue(dict, {}),
},
'redis': {
'url': SettingsValue((None, False, str), False, 'SEARXNG_REDIS_URL'),
},
'ui': {
'static_path': SettingsDirectoryValue(str, os.path.join(searx_dir, 'static')),
'static_use_hash': SettingsValue(bool, False),
'templates_path': SettingsDirectoryValue(str, os.path.join(searx_dir, 'templates')),
'default_theme': SettingsValue(str, 'simple'),
'default_locale': SettingsValue(str, ''),
'theme_args': {
'simple_style': SettingsValue(SIMPLE_STYLE, 'auto'),
},
'center_alignment': SettingsValue(bool, False),
'results_on_new_tab': SettingsValue(bool, False),
'advanced_search': SettingsValue(bool, False),
'query_in_title': SettingsValue(bool, False),
'infinite_scroll': SettingsValue(bool, False),
'cache_url': SettingsValue(str, 'https://web.archive.org/web/'),
'search_on_category_select': SettingsValue(bool, True),
'hotkeys': SettingsValue(('default', 'vim'), 'default'),
},
'preferences': {
'lock': SettingsValue(list, []),
},
'outgoing': {
'useragent_suffix': SettingsValue(str, ''),
'request_timeout': SettingsValue(numbers.Real, 3.0),
'enable_http2': SettingsValue(bool, True),
'verify': SettingsValue((bool, str), True),
'max_request_timeout': SettingsValue((None, numbers.Real), None),
'pool_connections': SettingsValue(int, 100),
'pool_maxsize': SettingsValue(int, 10),
'keepalive_expiry': SettingsValue(numbers.Real, 5.0),
# default maximum redirect
# from https://github.com/psf/requests/blob/8c211a96cdbe9fe320d63d9e1ae15c5c07e179f8/requests/models.py#L55
'max_redirects': SettingsValue(int, 30),
'retries': SettingsValue(int, 0),
'proxies': SettingsValue((None, str, dict), None),
'source_ips': SettingsValue((None, str, list), None),
# Tor configuration
'using_tor_proxy': SettingsValue(bool, False),
'extra_proxy_timeout': SettingsValue(int, 0),
'networks': {},
},
'result_proxy': {
'url': SettingsValue((None, str), None),
'key': SettingsBytesValue((None, bytes), None),
'proxify_results': SettingsValue(bool, False),
},
'plugins': SettingsValue(list, []),
'enabled_plugins': SettingsValue((None, list), None),
'checker': {
'off_when_debug': SettingsValue(bool, True, None),
'scheduling': SettingsValue((None, dict), None, None),
},
'categories_as_tabs': SettingsValue(dict, CATEGORIES_AS_TABS),
'engines': SettingsValue(list, []),
'doi_resolvers': {},
}
def settings_set_defaults(settings):
apply_schema(settings, SCHEMA, [])
return settings
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