forked from zaclys/searxng
Merge pull request #2347 from return42/mod-lang-detection
If language recognition fails use the Accept-Language
This commit is contained in:
Markus Heiser
GitHub
commit
45529f51a1
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@ -8,9 +8,10 @@
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from base64 import urlsafe_b64encode, urlsafe_b64decode
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from zlib import compress, decompress
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from urllib.parse import parse_qs, urlencode
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from typing import Iterable, Dict, List
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from typing import Iterable, Dict, List, Optional
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import flask
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import babel
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from searx import settings, autocomplete
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from searx.enginelib import Engine
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@ -287,10 +288,65 @@ class PluginsSetting(BooleanChoices):
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return [item[len('plugin_') :] for item in items]
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class ClientPref:
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"""Container to assemble client prefferences and settings."""
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# hint: searx.webapp.get_client_settings should be moved into this class
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locale: babel.Locale
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"""Locale prefered by the client."""
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def __init__(self, locale: Optional[babel.Locale] = None):
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self.locale = locale
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@property
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def locale_tag(self):
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if self.locale is None:
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return None
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tag = self.locale.language
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if self.locale.territory:
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tag += '-' + self.locale.territory
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return tag
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@classmethod
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def from_http_request(cls, http_request: flask.Request):
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"""Build ClientPref object from HTTP request.
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- `Accept-Language used for locale setting
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<https://www.w3.org/International/questions/qa-accept-lang-locales.en>`__
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"""
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al_header = http_request.headers.get("Accept-Language")
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if not al_header:
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return cls(locale=None)
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pairs = []
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for l in al_header.split(','):
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# fmt: off
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lang, qvalue = [_.strip() for _ in (l.split(';') + ['q=1',])[:2]]
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# fmt: on
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try:
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qvalue = float(qvalue.split('=')[-1])
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locale = babel.Locale.parse(lang, sep='-')
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except (ValueError, babel.core.UnknownLocaleError):
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continue
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pairs.append((locale, qvalue))
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pairs.sort(reverse=True, key=lambda x: x[1])
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return cls(locale=pairs[0][0])
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class Preferences:
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"""Validates and saves preferences to cookies"""
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def __init__(self, themes: List[str], categories: List[str], engines: Dict[str, Engine], plugins: Iterable[Plugin]):
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def __init__(
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self,
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themes: List[str],
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categories: List[str],
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engines: Dict[str, Engine],
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plugins: Iterable[Plugin],
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client: Optional[ClientPref] = None,
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):
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super().__init__()
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self.key_value_settings: Dict[str, Setting] = {
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@ -414,6 +470,7 @@ class Preferences:
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self.engines = EnginesSetting('engines', engines=engines.values())
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self.plugins = PluginsSetting('plugins', plugins=plugins)
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self.tokens = SetSetting('tokens')
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self.client = client or ClientPref()
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self.unknown_params: Dict[str, str] = {}
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def get_as_url_params(self):
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@ -22,7 +22,6 @@ from searx.network import initialize as initialize_network, check_network_config
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from searx.metrics import initialize as initialize_metrics, counter_inc, histogram_observe_time
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from searx.search.processors import PROCESSORS, initialize as initialize_processors
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from searx.search.checker import initialize as initialize_checker
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from searx.utils import detect_language
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logger = logger.getChild('search')
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@ -40,57 +39,19 @@ def initialize(settings_engines=None, enable_checker=False, check_network=False,
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initialize_checker()
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def replace_auto_language(search_query: SearchQuery):
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"""
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Do nothing except if `search_query.lang` is "auto".
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In this case:
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* the value "auto" is replaced by the detected language of the query.
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The default value is "all" when no language is detected.
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* `search_query.locale` is updated accordingly
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Use :py:obj:`searx.utils.detect_language` with `only_search_languages=True` to keep
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only languages supported by the engines.
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"""
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if search_query.lang != 'auto':
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return
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detected_lang = detect_language(search_query.query, threshold=0.3, only_search_languages=True)
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if detected_lang is None:
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# fallback to 'all' if no language has been detected
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search_query.lang = 'all'
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search_query.locale = None
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return
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search_query.lang = detected_lang
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try:
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search_query.locale = babel.Locale.parse(search_query.lang)
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except babel.core.UnknownLocaleError:
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search_query.locale = None
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class Search:
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"""Search information container"""
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__slots__ = "search_query", "result_container", "start_time", "actual_timeout"
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def __init__(self, search_query: SearchQuery):
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"""Initialize the Search
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search_query is copied
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"""
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"""Initialize the Search"""
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# init vars
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super().__init__()
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self.search_query = search_query
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self.result_container = ResultContainer()
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self.start_time = None
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self.actual_timeout = None
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self.search_query = copy(search_query)
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self.update_search_query(self.search_query)
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def update_search_query(self, search_query: SearchQuery):
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"""Update search_query.
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call replace_auto_language to replace the "auto" language
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"""
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replace_auto_language(search_query)
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def search_external_bang(self):
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"""
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@ -31,7 +31,7 @@ search:
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autocomplete_min: 4
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# Default search language - leave blank to detect from browser information or
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# use codes from 'languages.py'
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default_lang: ""
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default_lang: "auto"
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# Available languages
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# languages:
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# - all
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@ -6,6 +6,7 @@ from searx.query import RawTextQuery
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from searx.engines import categories, engines
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from searx.search import SearchQuery, EngineRef
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from searx.preferences import Preferences, is_locked
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from searx.utils import detect_language
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# remove duplicate queries.
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@ -214,7 +215,27 @@ def parse_engine_data(form):
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def get_search_query_from_webapp(
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preferences: Preferences, form: Dict[str, str]
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) -> Tuple[SearchQuery, RawTextQuery, List[EngineRef], List[EngineRef]]:
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) -> Tuple[SearchQuery, RawTextQuery, List[EngineRef], List[EngineRef], str]:
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"""Assemble data from preferences and request.form (from the HTML form) needed
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in a search query.
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The returned tuple consits of:
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1. instance of :py:obj:`searx.search.SearchQuery`
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2. instance of :py:obj:`searx.query.RawTextQuery`
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3. list of :py:obj:`searx.search.EngineRef` instances
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4. string with the *selected locale* of the query
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About language/locale: if the client selects the alias ``auto`` the
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``SearchQuery`` object is build up by the :py:obj:`detected language
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<searx.utils.detect_language>`. If language recognition does not have a
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match the language preferred by the :py:obj:`Preferences.client` is used.
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If client does not have a preference, the default ``all`` is used.
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The *selected locale* in the tuple always represents the selected
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language/locale and might differ from the language recognition.
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"""
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# no text for the query ?
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if not form.get('q'):
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raise SearxParameterException('q', '')
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@ -229,13 +250,19 @@ def get_search_query_from_webapp(
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# set query
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query = raw_text_query.getQuery()
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query_pageno = parse_pageno(form)
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query_lang = parse_lang(preferences, form, raw_text_query)
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query_safesearch = parse_safesearch(preferences, form)
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query_time_range = parse_time_range(form)
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query_timeout = parse_timeout(form, raw_text_query)
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external_bang = raw_text_query.external_bang
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engine_data = parse_engine_data(form)
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query_lang = parse_lang(preferences, form, raw_text_query)
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selected_locale = query_lang
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if query_lang == 'auto':
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query_lang = detect_language(query, threshold=0.8, only_search_languages=True)
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query_lang = query_lang or preferences.client.locale_tag or 'all'
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if not is_locked('categories') and raw_text_query.specific:
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# if engines are calculated from query,
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# set categories by using that information
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@ -265,4 +292,5 @@ def get_search_query_from_webapp(
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raw_text_query,
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query_engineref_list_unknown,
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query_engineref_list_notoken,
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selected_locale,
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)
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@ -84,6 +84,7 @@ from searx.webutils import (
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from searx.webadapter import (
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get_search_query_from_webapp,
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get_selected_categories,
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parse_lang,
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)
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from searx.utils import (
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html_to_text,
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@ -96,6 +97,7 @@ from searx.plugins import Plugin, plugins, initialize as plugin_initialize
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from searx.plugins.oa_doi_rewrite import get_doi_resolver
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from searx.preferences import (
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Preferences,
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ClientPref,
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ValidationException,
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)
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from searx.answerers import (
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@ -221,16 +223,9 @@ babel = Babel(app, locale_selector=get_locale)
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def _get_browser_language(req, lang_list):
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for lang in req.headers.get("Accept-Language", "en").split(","):
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if ';' in lang:
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lang = lang.split(';')[0]
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if '-' in lang:
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lang_parts = lang.split('-')
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lang = "{}-{}".format(lang_parts[0], lang_parts[-1].upper())
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locale = match_locale(lang, lang_list, fallback=None)
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if locale is not None:
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return locale
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return 'en'
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client = ClientPref.from_http_request(req)
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locale = match_locale(client.locale_tag, lang_list, fallback='en')
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return locale
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def _get_locale_rfc5646(locale):
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@ -446,11 +441,7 @@ def render(template_name: str, **kwargs):
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kwargs['rtl'] = True
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if 'current_language' not in kwargs:
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_locale = request.preferences.get_value('language')
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if _locale in ('auto', 'all'):
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kwargs['current_language'] = _locale
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else:
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kwargs['current_language'] = match_locale(_locale, settings['search']['languages'])
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kwargs['current_language'] = parse_lang(request.preferences, {}, RawTextQuery('', []))
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# values from settings
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kwargs['search_formats'] = [x for x in settings['search']['formats'] if x != 'html']
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@ -512,7 +503,10 @@ def pre_request():
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request.timings = [] # pylint: disable=assigning-non-slot
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request.errors = [] # pylint: disable=assigning-non-slot
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preferences = Preferences(themes, list(categories.keys()), engines, plugins) # pylint: disable=redefined-outer-name
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client_pref = ClientPref.from_http_request(request)
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# pylint: disable=redefined-outer-name
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preferences = Preferences(themes, list(categories.keys()), engines, plugins, client_pref)
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user_agent = request.headers.get('User-Agent', '').lower()
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if 'webkit' in user_agent and 'android' in user_agent:
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preferences.key_value_settings['method'].value = 'GET'
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@ -681,7 +675,9 @@ def search():
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raw_text_query = None
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result_container = None
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try:
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search_query, raw_text_query, _, _ = get_search_query_from_webapp(request.preferences, request.form)
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search_query, raw_text_query, _, _, selected_locale = get_search_query_from_webapp(
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request.preferences, request.form
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)
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# search = Search(search_query) # without plugins
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search = SearchWithPlugins(search_query, request.user_plugins, request) # pylint: disable=redefined-outer-name
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@ -812,13 +808,6 @@ def search():
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)
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)
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if search_query.lang in ('auto', 'all'):
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current_language = search_query.lang
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else:
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current_language = match_locale(
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search_query.lang, settings['search']['languages'], fallback=request.preferences.get_value("language")
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)
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# search_query.lang contains the user choice (all, auto, en, ...)
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# when the user choice is "auto", search.search_query.lang contains the detected language
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# otherwise it is equals to search_query.lang
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@ -841,7 +830,7 @@ def search():
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result_container.unresponsive_engines
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),
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current_locale = request.preferences.get_value("locale"),
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current_language = current_language,
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current_language = selected_locale,
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search_language = match_locale(
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search.search_query.lang,
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settings['search']['languages'],
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