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334 lines
11 KiB
Python
334 lines
11 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 Bing-WEB engine. Some of this
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implementations are shared by other engines:
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- :ref:`bing images engine`
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- :ref:`bing news engine`
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- :ref:`bing videos engine`
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On the `preference page`_ Bing offers a lot of languages an regions (see section
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'Search results languages' and 'Country/region'). However, the abundant choice
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does not correspond to reality, where Bing has a full-text indexer only for a
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limited number of languages. By example: you can select a language like Māori
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but you never get a result in this language.
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What comes a bit closer to the truth are the `search-APIs`_ but they don`t seem
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to be completely correct either (if you take a closer look you will find some
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inaccuracies there too):
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- :py:obj:`searx.engines.bing.bing_traits_url`
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- :py:obj:`searx.engines.bing_videos.bing_traits_url`
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- :py:obj:`searx.engines.bing_images.bing_traits_url`
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- :py:obj:`searx.engines.bing_news.bing_traits_url`
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.. _preference page: https://www.bing.com/account/general
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.. _search-APIs: https://learn.microsoft.com/en-us/bing/search-apis/
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"""
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# pylint: disable=too-many-branches, invalid-name
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from typing import TYPE_CHECKING
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import datetime
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import re
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import uuid
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from urllib.parse import urlencode
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from lxml import html
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import babel
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import babel.languages
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from searx.utils import eval_xpath, extract_text, eval_xpath_list, eval_xpath_getindex
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from searx import network
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from searx.locales import language_tag, region_tag
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from searx.enginelib.traits import EngineTraits
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if TYPE_CHECKING:
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import logging
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logger: logging.Logger
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traits: EngineTraits
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about = {
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"website": 'https://www.bing.com',
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"wikidata_id": 'Q182496',
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"official_api_documentation": 'https://www.microsoft.com/en-us/bing/apis/bing-web-search-api',
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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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send_accept_language_header = True
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"""Bing tries to guess user's language and territory from the HTTP
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Accept-Language. Optional the user can select a search-language (can be
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different to the UI language) and a region (market code)."""
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# engine dependent config
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categories = ['general', 'web']
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paging = True
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time_range_support = True
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safesearch = True
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safesearch_types = {2: 'STRICT', 1: 'DEMOTE', 0: 'OFF'} # cookie: ADLT=STRICT
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base_url = 'https://www.bing.com/search'
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"""Bing (Web) search URL"""
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bing_traits_url = 'https://learn.microsoft.com/en-us/bing/search-apis/bing-web-search/reference/market-codes'
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"""Bing (Web) search API description"""
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def _get_offset_from_pageno(pageno):
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return (pageno - 1) * 10 + 1
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def set_bing_cookies(params, engine_language, engine_region, SID):
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# set cookies
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# -----------
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params['cookies']['_EDGE_V'] = '1'
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# _EDGE_S: F=1&SID=3A5253BD6BCA609509B741876AF961CA&mkt=zh-tw
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_EDGE_S = [
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'F=1',
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'SID=%s' % SID,
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'mkt=%s' % engine_region.lower(),
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'ui=%s' % engine_language.lower(),
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]
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params['cookies']['_EDGE_S'] = '&'.join(_EDGE_S)
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logger.debug("cookie _EDGE_S=%s", params['cookies']['_EDGE_S'])
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# "_EDGE_CD": "m=zh-tw",
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_EDGE_CD = [ # pylint: disable=invalid-name
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'm=%s' % engine_region.lower(), # search region: zh-cn
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'u=%s' % engine_language.lower(), # UI: en-us
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]
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params['cookies']['_EDGE_CD'] = '&'.join(_EDGE_CD) + ';'
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logger.debug("cookie _EDGE_CD=%s", params['cookies']['_EDGE_CD'])
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SRCHHPGUSR = [ # pylint: disable=invalid-name
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'SRCHLANG=%s' % engine_language,
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# Trying to set ADLT cookie here seems not to have any effect, I assume
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# there is some age verification by a cookie (and/or session ID) needed,
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# to disable the SafeSearch.
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'ADLT=%s' % safesearch_types.get(params['safesearch'], 'DEMOTE'),
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]
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params['cookies']['SRCHHPGUSR'] = '&'.join(SRCHHPGUSR)
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logger.debug("cookie SRCHHPGUSR=%s", params['cookies']['SRCHHPGUSR'])
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def request(query, params):
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"""Assemble a Bing-Web request."""
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engine_region = traits.get_region(params['searxng_locale'], 'en-US')
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engine_language = traits.get_language(params['searxng_locale'], 'en')
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SID = uuid.uuid1().hex.upper()
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CVID = uuid.uuid1().hex.upper()
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set_bing_cookies(params, engine_language, engine_region, SID)
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# build URL query
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# ---------------
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# query term
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page = int(params.get('pageno', 1))
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query_params = {
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# fmt: off
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'q': query,
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'pq': query,
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'cvid': CVID,
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'qs': 'n',
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'sp': '-1'
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# fmt: on
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}
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# page
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if page > 1:
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referer = base_url + '?' + urlencode(query_params)
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params['headers']['Referer'] = referer
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logger.debug("headers.Referer --> %s", referer)
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query_params['first'] = _get_offset_from_pageno(page)
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if page == 2:
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query_params['FORM'] = 'PERE'
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elif page > 2:
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query_params['FORM'] = 'PERE%s' % (page - 2)
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filters = ''
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if params['time_range']:
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query_params['filt'] = 'custom'
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if params['time_range'] == 'day':
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filters = 'ex1:"ez1"'
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elif params['time_range'] == 'week':
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filters = 'ex1:"ez2"'
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elif params['time_range'] == 'month':
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filters = 'ex1:"ez3"'
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elif params['time_range'] == 'year':
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epoch_1970 = datetime.date(1970, 1, 1)
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today_no = (datetime.date.today() - epoch_1970).days
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filters = 'ex1:"ez5_%s_%s"' % (today_no - 365, today_no)
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params['url'] = base_url + '?' + urlencode(query_params)
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if filters:
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params['url'] = params['url'] + '&filters=' + filters
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return params
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def response(resp):
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results = []
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result_len = 0
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dom = html.fromstring(resp.text)
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# parse results again if nothing is found yet
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url_to_resolve = []
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url_to_resolve_index = []
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i = 0
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for result in eval_xpath_list(dom, '//ol[@id="b_results"]/li[contains(@class, "b_algo")]'):
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link = eval_xpath_getindex(result, './/h2/a', 0, None)
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if link is None:
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continue
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url = link.attrib.get('href')
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title = extract_text(link)
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# Make sure that the element is free of <a href> links and <span class='algoSlug_icon'>
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content = eval_xpath(result, '(.//p)[1]')
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for p in content:
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for e in p.xpath('.//a'):
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e.getparent().remove(e)
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for e in p.xpath('.//span[@class="algoSlug_icon"]'):
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e.getparent().remove(e)
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content = extract_text(content)
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# get the real URL either using the URL shown to user or following the Bing URL
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if url.startswith('https://www.bing.com/ck/a?'):
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url_cite = extract_text(eval_xpath(result, './/div[@class="b_attribution"]/cite'))
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# Bing can shorten the URL either at the end or in the middle of the string
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if (
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url_cite
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and url_cite.startswith('https://')
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and '…' not in url_cite
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and '...' not in url_cite
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and '›' not in url_cite
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):
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# no need for an additional HTTP request
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url = url_cite
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else:
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# resolve the URL with an additional HTTP request
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url_to_resolve.append(url.replace('&ntb=1', '&ntb=F'))
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url_to_resolve_index.append(i)
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url = None # remove the result if the HTTP Bing redirect raise an exception
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# append result
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results.append({'url': url, 'title': title, 'content': content})
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# increment result pointer for the next iteration in this loop
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i += 1
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# resolve all Bing redirections in parallel
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request_list = [
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network.Request.get(u, allow_redirects=False, headers=resp.search_params['headers']) for u in url_to_resolve
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]
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response_list = network.multi_requests(request_list)
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for i, redirect_response in enumerate(response_list):
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if not isinstance(redirect_response, Exception):
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results[url_to_resolve_index[i]]['url'] = redirect_response.headers['location']
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# get number_of_results
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try:
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result_len_container = "".join(eval_xpath(dom, '//span[@class="sb_count"]//text()'))
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if "-" in result_len_container:
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# Remove the part "from-to" for paginated request ...
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result_len_container = result_len_container[result_len_container.find("-") * 2 + 2 :]
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result_len_container = re.sub('[^0-9]', '', result_len_container)
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if len(result_len_container) > 0:
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result_len = int(result_len_container)
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except Exception as e: # pylint: disable=broad-except
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logger.debug('result error :\n%s', e)
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if result_len and _get_offset_from_pageno(resp.search_params.get("pageno", 0)) > result_len:
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return []
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results.append({'number_of_results': result_len})
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return results
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def fetch_traits(engine_traits: EngineTraits):
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"""Fetch languages and regions from Bing-Web."""
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xpath_market_codes = '//table[1]/tbody/tr/td[3]'
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# xpath_country_codes = '//table[2]/tbody/tr/td[2]'
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xpath_language_codes = '//table[3]/tbody/tr/td[2]'
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_fetch_traits(engine_traits, bing_traits_url, xpath_language_codes, xpath_market_codes)
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def _fetch_traits(engine_traits: EngineTraits, url: str, xpath_language_codes: str, xpath_market_codes: str):
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# insert alias to map from a language (zh) to a language + script (zh_Hans)
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engine_traits.languages['zh'] = 'zh-hans'
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resp = network.get(url)
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if not resp.ok:
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print("ERROR: response from peertube is not OK.")
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dom = html.fromstring(resp.text)
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map_lang = {'jp': 'ja'}
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for td in eval_xpath(dom, xpath_language_codes):
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eng_lang = td.text
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if eng_lang in ('en-gb', 'pt-br'):
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# language 'en' is already in the list and a language 'en-gb' can't
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# be handled in SearXNG, same with pt-br which is covered by pt-pt.
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continue
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babel_lang = map_lang.get(eng_lang, eng_lang).replace('-', '_')
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try:
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sxng_tag = language_tag(babel.Locale.parse(babel_lang))
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except babel.UnknownLocaleError:
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print("ERROR: language (%s) is unknown by babel" % (eng_lang))
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continue
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conflict = engine_traits.languages.get(sxng_tag)
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if conflict:
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if conflict != eng_lang:
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print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_lang))
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continue
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engine_traits.languages[sxng_tag] = eng_lang
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map_region = {
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'en-ID': 'id_ID',
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'no-NO': 'nb_NO',
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}
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for td in eval_xpath(dom, xpath_market_codes):
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eng_region = td.text
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babel_region = map_region.get(eng_region, eng_region).replace('-', '_')
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if eng_region == 'en-WW':
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engine_traits.all_locale = eng_region
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continue
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try:
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sxng_tag = region_tag(babel.Locale.parse(babel_region))
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except babel.UnknownLocaleError:
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print("ERROR: region (%s) is unknown by babel" % (eng_region))
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continue
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conflict = engine_traits.regions.get(sxng_tag)
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if conflict:
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if conflict != eng_region:
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print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_region))
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continue
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engine_traits.regions[sxng_tag] = eng_region
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