mirror of
https://github.com/searxng/searxng.git
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407 lines
13 KiB
Python
407 lines
13 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""This is the implementation of the google WEB engine. Some of this
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implementations are shared by other engines:
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- :ref:`google images engine`
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- :ref:`google news engine`
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- :ref:`google videos engine`
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The google WEB engine itself has a special setup option:
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.. code:: yaml
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- name: google
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...
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use_mobile_ui: true
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``use_mobile_ui``: (default: ``true``)
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Enables to use *mobile endpoint* to bypass the google blocking (see
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:issue:`159`). On the mobile UI of Google Search, the button :guilabel:`More
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results` is not affected by Google rate limiting and we can still do requests
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while actively blocked by the original Google search. By activate
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``use_mobile_ui`` this behavior is simulated by adding the parameter
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``async=use_ac:true,_fmt:pc`` to the :py:func:`request`.
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"""
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# pylint: disable=invalid-name, missing-function-docstring
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from urllib.parse import urlencode
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from lxml import html
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from searx import logger
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from searx.utils import match_language, extract_text, eval_xpath, eval_xpath_list, eval_xpath_getindex
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from searx.exceptions import SearxEngineCaptchaException
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logger = logger.getChild('google engine')
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# about
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about = {
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"website": 'https://www.google.com',
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"wikidata_id": 'Q9366',
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"official_api_documentation": 'https://developers.google.com/custom-search/',
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"use_official_api": False,
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"require_api_key": False,
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"results": 'HTML',
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}
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# engine dependent config
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categories = ['general']
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paging = True
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time_range_support = True
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safesearch = True
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use_mobile_ui = False
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supported_languages_url = 'https://www.google.com/preferences?#languages'
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# based on https://en.wikipedia.org/wiki/List_of_Google_domains and tests
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google_domains = {
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'BG': 'google.bg', # Bulgaria
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'CZ': 'google.cz', # Czech Republic
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'DE': 'google.de', # Germany
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'DK': 'google.dk', # Denmark
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'AT': 'google.at', # Austria
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'CH': 'google.ch', # Switzerland
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'GR': 'google.gr', # Greece
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'AU': 'google.com.au', # Australia
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'CA': 'google.ca', # Canada
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'GB': 'google.co.uk', # United Kingdom
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'ID': 'google.co.id', # Indonesia
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'IE': 'google.ie', # Ireland
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'IN': 'google.co.in', # India
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'MY': 'google.com.my', # Malaysia
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'NZ': 'google.co.nz', # New Zealand
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'PH': 'google.com.ph', # Philippines
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'SG': 'google.com.sg', # Singapore
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'US': 'google.com', # United States (google.us) redirects to .com
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'ZA': 'google.co.za', # South Africa
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'AR': 'google.com.ar', # Argentina
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'CL': 'google.cl', # Chile
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'ES': 'google.es', # Spain
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'MX': 'google.com.mx', # Mexico
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'EE': 'google.ee', # Estonia
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'FI': 'google.fi', # Finland
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'BE': 'google.be', # Belgium
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'FR': 'google.fr', # France
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'IL': 'google.co.il', # Israel
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'HR': 'google.hr', # Croatia
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'HU': 'google.hu', # Hungary
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'IT': 'google.it', # Italy
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'JP': 'google.co.jp', # Japan
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'KR': 'google.co.kr', # South Korea
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'LT': 'google.lt', # Lithuania
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'LV': 'google.lv', # Latvia
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'NO': 'google.no', # Norway
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'NL': 'google.nl', # Netherlands
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'PL': 'google.pl', # Poland
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'BR': 'google.com.br', # Brazil
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'PT': 'google.pt', # Portugal
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'RO': 'google.ro', # Romania
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'RU': 'google.ru', # Russia
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'SK': 'google.sk', # Slovakia
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'SI': 'google.si', # Slovenia
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'SE': 'google.se', # Sweden
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'TH': 'google.co.th', # Thailand
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'TR': 'google.com.tr', # Turkey
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'UA': 'google.com.ua', # Ukraine
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'CN': 'google.com.hk', # There is no google.cn, we use .com.hk for zh-CN
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'HK': 'google.com.hk', # Hong Kong
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'TW': 'google.com.tw' # Taiwan
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}
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time_range_dict = {
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'day': 'd',
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'week': 'w',
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'month': 'm',
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'year': 'y'
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}
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# Filter results. 0: None, 1: Moderate, 2: Strict
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filter_mapping = {
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0: 'off',
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1: 'medium',
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2: 'high'
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}
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# specific xpath variables
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# ------------------------
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# google results are grouped into <div class="g" ../>
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results_xpath = '//div[@class="g"]'
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# google *sections* are no usual *results*, we ignore them
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g_section_with_header = './g-section-with-header'
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# the title is a h3 tag relative to the result group
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title_xpath = './/h3[1]'
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# in the result group there is <div class="yuRUbf" ../> it's first child is a <a
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# href=...>
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href_xpath = './/div[@class="yuRUbf"]//a/@href'
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# in the result group there is <div class="IsZvec" ../> containing he *content*
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content_xpath = './/div[@class="IsZvec"]'
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# Suggestions are links placed in a *card-section*, we extract only the text
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# from the links not the links itself.
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suggestion_xpath = '//div[contains(@class, "card-section")]//a'
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# Since google does *auto-correction* on the first query these are not really
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# *spelling suggestions*, we use them anyway.
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spelling_suggestion_xpath = '//div[@class="med"]/p/a'
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def get_lang_info(params, lang_list, custom_aliases, supported_any_language):
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"""Composing various language properties for the google engines.
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This function is called by the various google engines (:ref:`google web
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engine`, :ref:`google images engine`, :ref:`google news engine` and
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:ref:`google videos engine`).
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:param dict param: request parameters of the engine
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:param list lang_list: list of supported languages of the engine
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:py:obj:`ENGINES_LANGUAGES[engine-name] <searx.data.ENGINES_LANGUAGES>`
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:param dict lang_list: custom aliases for non standard language codes
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(used when calling :py:func:`searx.utils.match_language`)
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:param bool supported_any_language: When a language is not specified, the
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language interpretation is left up to Google to decide how the search
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results should be delivered. This argument is ``True`` for the google
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engine and ``False`` for the other engines (google-images, -news,
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-scholar, -videos).
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:rtype: dict
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:returns:
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Py-Dictionary with the key/value pairs:
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language:
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Return value from :py:func:`searx.utils.match_language`
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country:
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The country code (e.g. US, AT, CA, FR, DE ..)
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subdomain:
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Google subdomain :py:obj:`google_domains` that fits to the country
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code.
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params:
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Py-Dictionary with additional request arguments (can be passed to
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:py:func:`urllib.parse.urlencode`).
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headers:
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Py-Dictionary with additional HTTP headers (can be passed to
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request's headers)
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"""
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ret_val = {
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'language' : None,
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'country' : None,
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'subdomain' : None,
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'params' : {},
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'headers' : {},
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}
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# language ...
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_lang = params['language']
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_any_language = _lang.lower() == 'all'
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if _any_language:
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_lang = 'en-US'
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language = match_language(_lang, lang_list, custom_aliases)
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ret_val['language'] = language
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# country ...
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_l = _lang.split('-')
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if len(_l) == 2:
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country = _l[1]
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else:
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country = _l[0].upper()
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if country == 'EN':
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country = 'US'
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ret_val['country'] = country
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# subdomain ...
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ret_val['subdomain'] = 'www.' + google_domains.get(country.upper(), 'google.com')
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# params & headers
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lang_country = '%s-%s' % (language, country) # (en-US, en-EN, de-DE, de-AU, fr-FR ..)
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# hl parameter:
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# https://developers.google.com/custom-search/docs/xml_results#hlsp The
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# Interface Language:
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# https://developers.google.com/custom-search/docs/xml_results_appendices#interfaceLanguages
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ret_val['params']['hl'] = lang_list.get(lang_country, language)
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# lr parameter:
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# The lr (language restrict) parameter restricts search results to
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# documents written in a particular language.
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# https://developers.google.com/custom-search/docs/xml_results#lrsp
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# Language Collection Values:
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# https://developers.google.com/custom-search/docs/xml_results_appendices#languageCollections
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if _any_language and supported_any_language:
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# interpretation is left up to Google (based on whoogle)
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#
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# - add parameter ``source=lnt``
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# - don't use parameter ``lr``
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# - don't add a ``Accept-Language`` HTTP header.
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ret_val['params']['source'] = 'lnt'
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else:
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# restricts search results to documents written in a particular
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# language.
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ret_val['params']['lr'] = "lang_" + lang_list.get(lang_country, language)
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# Accept-Language: fr-CH, fr;q=0.8, en;q=0.6, *;q=0.5
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ret_val['headers']['Accept-Language'] = ','.join([
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lang_country,
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language + ';q=0.8,',
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'en;q=0.6',
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'*;q=0.5',
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])
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return ret_val
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def detect_google_sorry(resp):
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if resp.url.host == 'sorry.google.com' or resp.url.path.startswith('/sorry'):
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raise SearxEngineCaptchaException()
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def request(query, params):
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"""Google search request"""
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offset = (params['pageno'] - 1) * 10
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lang_info = get_lang_info(
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# pylint: disable=undefined-variable
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params, supported_languages, language_aliases, True
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)
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additional_parameters = {}
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if use_mobile_ui:
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additional_parameters = {
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'asearch': 'arc',
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'async': 'use_ac:true,_fmt:pc',
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}
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# https://www.google.de/search?q=corona&hl=de&lr=lang_de&start=0&tbs=qdr%3Ad&safe=medium
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query_url = 'https://' + lang_info['subdomain'] + '/search' + "?" + urlencode({
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'q': query,
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**lang_info['params'],
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'ie': "utf8",
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'oe': "utf8",
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'start': offset,
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**additional_parameters,
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})
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if params['time_range'] in time_range_dict:
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query_url += '&' + urlencode({'tbs': 'qdr:' + time_range_dict[params['time_range']]})
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if params['safesearch']:
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query_url += '&' + urlencode({'safe': filter_mapping[params['safesearch']]})
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params['url'] = query_url
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params['headers'].update(lang_info['headers'])
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if use_mobile_ui:
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params['headers']['Accept'] = '*/*'
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else:
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params['headers']['Accept'] = (
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'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
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)
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return params
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def response(resp):
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"""Get response from google's search request"""
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detect_google_sorry(resp)
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results = []
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# convert the text to dom
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dom = html.fromstring(resp.text)
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# results --> answer
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answer_list = eval_xpath(dom, '//div[contains(@class, "LGOjhe")]')
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if answer_list:
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answer_list = [_.xpath("normalize-space()") for _ in answer_list]
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results.append({'answer': ' '.join(answer_list)})
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else:
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logger.debug("did not find 'answer'")
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# results --> number_of_results
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if not use_mobile_ui:
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try:
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_txt = eval_xpath_getindex(dom, '//div[@id="result-stats"]//text()', 0)
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_digit = ''.join([n for n in _txt if n.isdigit()])
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number_of_results = int(_digit)
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results.append({'number_of_results': number_of_results})
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except Exception as e: # pylint: disable=broad-except
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logger.debug("did not 'number_of_results'")
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logger.error(e, exc_info=True)
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# parse results
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for result in eval_xpath_list(dom, results_xpath):
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# google *sections*
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if extract_text(eval_xpath(result, g_section_with_header)):
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logger.debug("ingoring <g-section-with-header>")
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continue
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try:
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title_tag = eval_xpath_getindex(result, title_xpath, 0, default=None)
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if title_tag is None:
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# this not one of the common google results *section*
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logger.debug('ingoring <div class="g" ../> section: missing title')
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continue
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title = extract_text(title_tag)
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url = eval_xpath_getindex(result, href_xpath, 0, None)
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if url is None:
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continue
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content = extract_text(eval_xpath_getindex(result, content_xpath, 0, default=None), allow_none=True)
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results.append({
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'url': url,
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'title': title,
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'content': content
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})
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except Exception as e: # pylint: disable=broad-except
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logger.error(e, exc_info=True)
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# from lxml import etree
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# logger.debug(etree.tostring(result, pretty_print=True))
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# import pdb
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# pdb.set_trace()
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continue
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# parse suggestion
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for suggestion in eval_xpath_list(dom, suggestion_xpath):
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# append suggestion
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results.append({'suggestion': extract_text(suggestion)})
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for correction in eval_xpath_list(dom, spelling_suggestion_xpath):
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results.append({'correction': extract_text(correction)})
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# return results
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return results
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# get supported languages from their site
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def _fetch_supported_languages(resp):
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ret_val = {}
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dom = html.fromstring(resp.text)
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radio_buttons = eval_xpath_list(dom, '//*[@id="langSec"]//input[@name="lr"]')
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for x in radio_buttons:
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name = x.get("data-name")
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code = x.get("value").split('_')[-1]
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ret_val[code] = {"name": name}
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return ret_val
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