searxng/searx/preferences.py
2022-06-05 19:59:49 +02:00

533 lines
19 KiB
Python

# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""Searx preferences implementation.
"""
# pylint: disable=useless-object-inheritance
from base64 import urlsafe_b64encode, urlsafe_b64decode
from zlib import compress, decompress
from urllib.parse import parse_qs, urlencode
from typing import Iterable, Dict, List
import flask
from searx import settings, autocomplete
from searx.engines import Engine
from searx.plugins import Plugin
from searx.locales import LOCALE_NAMES
from searx.webutils import VALID_LANGUAGE_CODE
from searx.engines import OTHER_CATEGORY
COOKIE_MAX_AGE = 60 * 60 * 24 * 365 * 5 # 5 years
DOI_RESOLVERS = list(settings['doi_resolvers'])
class ValidationException(Exception):
"""Exption from ``cls.__init__`` when configuration value is invalid."""
class Setting:
"""Base class of user settings"""
def __init__(self, default_value, locked: bool = False):
super().__init__()
self.value = default_value
self.locked = locked
def parse(self, data: str):
"""Parse ``data`` and store the result at ``self.value``
If needed, its overwritten in the inheritance.
"""
self.value = data
def get_value(self):
"""Returns the value of the setting
If needed, its overwritten in the inheritance.
"""
return self.value
def save(self, name: str, resp: flask.Response):
"""Save cookie ``name`` in the HTTP reponse obect
If needed, its overwritten in the inheritance."""
resp.set_cookie(name, self.value, max_age=COOKIE_MAX_AGE)
class StringSetting(Setting):
"""Setting of plain string values"""
class EnumStringSetting(Setting):
"""Setting of a value which can only come from the given choices"""
def __init__(self, default_value: str, choices: Iterable[str], locked=False):
super().__init__(default_value, locked)
self.choices = choices
self._validate_selection(self.value)
def _validate_selection(self, selection: str):
if selection not in self.choices:
raise ValidationException('Invalid value: "{0}"'.format(selection))
def parse(self, data: str):
"""Parse and validate ``data`` and store the result at ``self.value``"""
self._validate_selection(data)
self.value = data
class MultipleChoiceSetting(Setting):
"""Setting of values which can only come from the given choices"""
def __init__(self, default_value: List[str], choices: Iterable[str], locked=False):
super().__init__(default_value, locked)
self.choices = choices
self._validate_selections(self.value)
def _validate_selections(self, selections: List[str]):
for item in selections:
if item not in self.choices:
raise ValidationException('Invalid value: "{0}"'.format(selections))
def parse(self, data: str):
"""Parse and validate ``data`` and store the result at ``self.value``"""
if data == '':
self.value = []
return
elements = data.split(',')
self._validate_selections(elements)
self.value = elements
def parse_form(self, data: List[str]):
if self.locked:
return
self.value = []
for choice in data:
if choice in self.choices and choice not in self.value:
self.value.append(choice)
def save(self, name: str, resp: flask.Response):
"""Save cookie ``name`` in the HTTP reponse obect"""
resp.set_cookie(name, ','.join(self.value), max_age=COOKIE_MAX_AGE)
class SetSetting(Setting):
"""Setting of values of type ``set`` (comma separated string)"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.values = set()
def get_value(self):
"""Returns a string with comma separated values."""
return ','.join(self.values)
def parse(self, data: str):
"""Parse and validate ``data`` and store the result at ``self.value``"""
if data == '':
self.values = set()
return
elements = data.split(',')
for element in elements:
self.values.add(element)
def parse_form(self, data: str):
if self.locked:
return
elements = data.split(',')
self.values = set(elements)
def save(self, name: str, resp: flask.Response):
"""Save cookie ``name`` in the HTTP reponse obect"""
resp.set_cookie(name, ','.join(self.values), max_age=COOKIE_MAX_AGE)
class SearchLanguageSetting(EnumStringSetting):
"""Available choices may change, so user's value may not be in choices anymore"""
def _validate_selection(self, selection):
if selection != '' and not VALID_LANGUAGE_CODE.match(selection):
raise ValidationException('Invalid language code: "{0}"'.format(selection))
def parse(self, data: str):
"""Parse and validate ``data`` and store the result at ``self.value``"""
if data not in self.choices and data != self.value:
# hack to give some backwards compatibility with old language cookies
data = str(data).replace('_', '-')
lang = data.split('-', maxsplit=1)[0]
if data in self.choices:
pass
elif lang in self.choices:
data = lang
else:
data = self.value
self._validate_selection(data)
self.value = data
class MapSetting(Setting):
"""Setting of a value that has to be translated in order to be storable"""
def __init__(self, default_value, map: Dict[str, object], locked=False): # pylint: disable=redefined-builtin
super().__init__(default_value, locked)
self.map = map
if self.value not in self.map.values():
raise ValidationException('Invalid default value')
def parse(self, data: str):
"""Parse and validate ``data`` and store the result at ``self.value``"""
if data not in self.map:
raise ValidationException('Invalid choice: {0}'.format(data))
self.value = self.map[data]
self.key = data # pylint: disable=attribute-defined-outside-init
def save(self, name: str, resp: flask.Response):
"""Save cookie ``name`` in the HTTP reponse obect"""
if hasattr(self, 'key'):
resp.set_cookie(name, self.key, max_age=COOKIE_MAX_AGE)
class BooleanChoices:
"""Maps strings to booleans that are either true or false."""
def __init__(self, name: str, choices: Dict[str, bool], locked: bool = False):
self.name = name
self.choices = choices
self.locked = locked
self.default_choices = dict(choices)
def transform_form_items(self, items):
# pylint: disable=no-self-use
return items
def transform_values(self, values):
# pylint: disable=no-self-use
return values
def parse_cookie(self, data_disabled: str, data_enabled: str):
for disabled in data_disabled.split(','):
if disabled in self.choices:
self.choices[disabled] = False
for enabled in data_enabled.split(','):
if enabled in self.choices:
self.choices[enabled] = True
def parse_form(self, items: List[str]):
if self.locked:
return
disabled = self.transform_form_items(items)
for setting in self.choices:
self.choices[setting] = setting not in disabled
@property
def enabled(self):
return (k for k, v in self.choices.items() if v)
@property
def disabled(self):
return (k for k, v in self.choices.items() if not v)
def save(self, resp: flask.Response):
"""Save cookie in the HTTP reponse obect"""
disabled_changed = (k for k in self.disabled if self.default_choices[k])
enabled_changed = (k for k in self.enabled if not self.default_choices[k])
resp.set_cookie('disabled_{0}'.format(self.name), ','.join(disabled_changed), max_age=COOKIE_MAX_AGE)
resp.set_cookie('enabled_{0}'.format(self.name), ','.join(enabled_changed), max_age=COOKIE_MAX_AGE)
def get_disabled(self):
return self.transform_values(list(self.disabled))
def get_enabled(self):
return self.transform_values(list(self.enabled))
class EnginesSetting(BooleanChoices):
"""Engine settings"""
def __init__(self, default_value, engines: Iterable[Engine]):
choices = {}
for engine in engines:
for category in engine.categories:
if not category in list(settings['categories_as_tabs'].keys()) + [OTHER_CATEGORY]:
continue
choices['{}__{}'.format(engine.name, category)] = not engine.disabled
super().__init__(default_value, choices)
def transform_form_items(self, items):
return [item[len('engine_') :].replace('_', ' ').replace(' ', '__') for item in items]
def transform_values(self, values):
if len(values) == 1 and next(iter(values)) == '':
return []
transformed_values = []
for value in values:
engine, category = value.split('__')
transformed_values.append((engine, category))
return transformed_values
class PluginsSetting(BooleanChoices):
"""Plugin settings"""
def __init__(self, default_value, plugins: Iterable[Plugin]):
super().__init__(default_value, {plugin.id: plugin.default_on for plugin in plugins})
def transform_form_items(self, items):
return [item[len('plugin_') :] for item in items]
class Preferences:
"""Validates and saves preferences to cookies"""
def __init__(self, themes: List[str], categories: List[str], engines: Dict[str, Engine], plugins: Iterable[Plugin]):
super().__init__()
self.key_value_settings: Dict[str, Setting] = {
# fmt: off
'categories': MultipleChoiceSetting(
['general'],
locked=is_locked('categories'),
choices=categories + ['none']
),
'language': SearchLanguageSetting(
settings['search']['default_lang'],
locked=is_locked('language'),
choices=settings['search']['languages'] + ['']
),
'locale': EnumStringSetting(
settings['ui']['default_locale'],
locked=is_locked('locale'),
choices=list(LOCALE_NAMES.keys()) + ['']
),
'autocomplete': EnumStringSetting(
settings['search']['autocomplete'],
locked=is_locked('autocomplete'),
choices=list(autocomplete.backends.keys()) + ['']
),
'image_proxy': MapSetting(
settings['server']['image_proxy'],
locked=is_locked('image_proxy'),
map={
'': settings['server']['image_proxy'],
'0': False,
'1': True,
'True': True,
'False': False
}
),
'method': EnumStringSetting(
settings['server']['method'],
locked=is_locked('method'),
choices=('GET', 'POST')
),
'safesearch': MapSetting(
settings['search']['safe_search'],
locked=is_locked('safesearch'),
map={
'0': 0,
'1': 1,
'2': 2
}
),
'theme': EnumStringSetting(
settings['ui']['default_theme'],
locked=is_locked('theme'),
choices=themes
),
'results_on_new_tab': MapSetting(
settings['ui']['results_on_new_tab'],
locked=is_locked('results_on_new_tab'),
map={
'0': False,
'1': True,
'False': False,
'True': True
}
),
'doi_resolver': MultipleChoiceSetting(
[settings['default_doi_resolver'], ],
locked=is_locked('doi_resolver'),
choices=DOI_RESOLVERS
),
'simple_style': EnumStringSetting(
settings['ui']['theme_args']['simple_style'],
locked=is_locked('simple_style'),
choices=['', 'auto', 'light', 'dark']
),
'center_aligment': MapSetting(
settings['ui']['center_aligment'],
locked=is_locked('center_aligment'),
map={
'0': False,
'1': True,
'False': False,
'True': True
}
),
'advanced_search': MapSetting(
settings['ui']['advanced_search'],
locked=is_locked('advanced_search'),
map={
'0': False,
'1': True,
'False': False,
'True': True,
'on': True,
}
),
'query_in_title': MapSetting(
settings['ui']['query_in_title'],
locked=is_locked('query_in_title'),
map={
'': settings['ui']['query_in_title'],
'0': False,
'1': True,
'True': True,
'False': False
}
),
'infinite_scroll': MapSetting(
settings['ui']['infinite_scroll'],
locked=is_locked('infinite_scroll'),
map={
'': settings['ui']['infinite_scroll'],
'0': False,
'1': True,
'True': True,
'False': False
}
),
# fmt: on
}
self.engines = EnginesSetting('engines', engines=engines.values())
self.plugins = PluginsSetting('plugins', plugins=plugins)
self.tokens = SetSetting('tokens')
self.unknown_params: Dict[str, str] = {}
def get_as_url_params(self):
"""Return preferences as URL parameters"""
settings_kv = {}
for k, v in self.key_value_settings.items():
if v.locked:
continue
if isinstance(v, MultipleChoiceSetting):
settings_kv[k] = ','.join(v.get_value())
else:
settings_kv[k] = v.get_value()
settings_kv['disabled_engines'] = ','.join(self.engines.disabled)
settings_kv['enabled_engines'] = ','.join(self.engines.enabled)
settings_kv['disabled_plugins'] = ','.join(self.plugins.disabled)
settings_kv['enabled_plugins'] = ','.join(self.plugins.enabled)
settings_kv['tokens'] = ','.join(self.tokens.values)
return urlsafe_b64encode(compress(urlencode(settings_kv).encode())).decode()
def parse_encoded_data(self, input_data: str):
"""parse (base64) preferences from request (``flask.request.form['preferences']``)"""
bin_data = decompress(urlsafe_b64decode(input_data))
dict_data = {}
for x, y in parse_qs(bin_data.decode('ascii')).items():
dict_data[x] = y[0]
self.parse_dict(dict_data)
def parse_dict(self, input_data: Dict[str, str]):
"""parse preferences from request (``flask.request.form``)"""
for user_setting_name, user_setting in input_data.items():
if user_setting_name in self.key_value_settings:
if self.key_value_settings[user_setting_name].locked:
continue
self.key_value_settings[user_setting_name].parse(user_setting)
elif user_setting_name == 'disabled_engines':
self.engines.parse_cookie(input_data.get('disabled_engines', ''), input_data.get('enabled_engines', ''))
elif user_setting_name == 'disabled_plugins':
self.plugins.parse_cookie(input_data.get('disabled_plugins', ''), input_data.get('enabled_plugins', ''))
elif user_setting_name == 'tokens':
self.tokens.parse(user_setting)
elif not any(
user_setting_name.startswith(x) for x in ['enabled_', 'disabled_', 'engine_', 'category_', 'plugin_']
):
self.unknown_params[user_setting_name] = user_setting
def parse_form(self, input_data: Dict[str, str]):
"""Parse formular (``<input>``) data from a ``flask.request.form``"""
disabled_engines = []
enabled_categories = []
disabled_plugins = []
for user_setting_name, user_setting in input_data.items():
if user_setting_name in self.key_value_settings:
self.key_value_settings[user_setting_name].parse(user_setting)
elif user_setting_name.startswith('engine_'):
disabled_engines.append(user_setting_name)
elif user_setting_name.startswith('category_'):
enabled_categories.append(user_setting_name[len('category_') :])
elif user_setting_name.startswith('plugin_'):
disabled_plugins.append(user_setting_name)
elif user_setting_name == 'tokens':
self.tokens.parse_form(user_setting)
else:
self.unknown_params[user_setting_name] = user_setting
self.key_value_settings['categories'].parse_form(enabled_categories)
self.engines.parse_form(disabled_engines)
self.plugins.parse_form(disabled_plugins)
# cannot be used in case of engines or plugins
def get_value(self, user_setting_name: str):
"""Returns the value for ``user_setting_name``"""
ret_val = None
if user_setting_name in self.key_value_settings:
ret_val = self.key_value_settings[user_setting_name].get_value()
if user_setting_name in self.unknown_params:
ret_val = self.unknown_params[user_setting_name]
return ret_val
def save(self, resp: flask.Response):
"""Save cookie in the HTTP reponse obect"""
for user_setting_name, user_setting in self.key_value_settings.items():
# pylint: disable=unnecessary-dict-index-lookup
if self.key_value_settings[user_setting_name].locked:
continue
user_setting.save(user_setting_name, resp)
self.engines.save(resp)
self.plugins.save(resp)
self.tokens.save('tokens', resp)
for k, v in self.unknown_params.items():
resp.set_cookie(k, v, max_age=COOKIE_MAX_AGE)
return resp
def validate_token(self, engine):
valid = True
if hasattr(engine, 'tokens') and engine.tokens:
valid = False
for token in self.tokens.values:
if token in engine.tokens:
valid = True
break
return valid
def is_locked(setting_name: str):
"""Checks if a given setting name is locked by settings.yml"""
if 'preferences' not in settings:
return False
if 'lock' not in settings['preferences']:
return False
return setting_name in settings['preferences']['lock']