searxng/searx/engines/bing.py

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# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""Bing (Web)
- https://github.com/searx/searx/issues/2019#issuecomment-648227442
"""
# pylint: disable=too-many-branches
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import re
from urllib.parse import urlencode, urlparse, parse_qs
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from lxml import html
from searx.utils import eval_xpath, extract_text, eval_xpath_list, match_language, eval_xpath_getindex
from searx.network import multi_requests, Request
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from searx.enginelib.traits import EngineTraits
traits: EngineTraits
about = {
"website": 'https://www.bing.com',
"wikidata_id": 'Q182496',
"official_api_documentation": 'https://www.microsoft.com/en-us/bing/apis/bing-web-search-api',
"use_official_api": False,
"require_api_key": False,
"results": 'HTML',
}
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# engine dependent config
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categories = ['general', 'web']
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paging = True
time_range_support = False
safesearch = False
send_accept_language_header = True
supported_languages_url = 'https://www.bing.com/account/general'
language_aliases = {}
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# search-url
base_url = 'https://www.bing.com/'
# initial query: https://www.bing.com/search?q=foo&search=&form=QBLH
inital_query = 'search?{query}&search=&form=QBLH'
# following queries: https://www.bing.com/search?q=foo&search=&first=11&FORM=PERE
page_query = 'search?{query}&search=&first={offset}&FORM=PERE'
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def _get_offset_from_pageno(pageno):
return (pageno - 1) * 10 + 1
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def request(query, params):
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offset = _get_offset_from_pageno(params.get('pageno', 1))
# logger.debug("params['pageno'] --> %s", params.get('pageno'))
# logger.debug(" offset --> %s", offset)
search_string = page_query
if offset == 1:
search_string = inital_query
if params['language'] == 'all':
lang = 'EN'
else:
lang = match_language(params['language'], supported_languages, language_aliases)
query = 'language:{} {}'.format(lang.split('-')[0].upper(), query)
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search_path = search_string.format(query=urlencode({'q': query}), offset=offset)
if offset > 1:
referer = base_url + inital_query.format(query=urlencode({'q': query}))
params['headers']['Referer'] = referer
logger.debug("headers.Referer --> %s", referer)
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params['url'] = base_url + search_path
params['headers']['Accept'] = 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
return params
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def response(resp):
results = []
result_len = 0
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dom = html.fromstring(resp.text)
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# parse results again if nothing is found yet
url_to_resolve = []
url_to_resolve_index = []
i = 0
for result in eval_xpath_list(dom, '//ol[@id="b_results"]/li[contains(@class, "b_algo")]'):
link = eval_xpath_getindex(result, './/h2/a', 0, None)
if link is None:
continue
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url = link.attrib.get('href')
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title = extract_text(link)
# Make sure that the element is free of <a href> links and <span class='algoSlug_icon'>
content = eval_xpath(result, '(.//p)[1]')
for p in content:
for e in p.xpath('.//a'):
e.getparent().remove(e)
for e in p.xpath('.//span[@class="algoSlug_icon"]'):
e.getparent().remove(e)
content = extract_text(content)
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# get the real URL either using the URL shown to user or following the Bing URL
if url.startswith('https://www.bing.com/ck/a?'):
url_cite = extract_text(eval_xpath(result, './/div[@class="b_attribution"]/cite'))
# Bing can shorten the URL either at the end or in the middle of the string
if (
url_cite.startswith('https://')
and '' not in url_cite
and '...' not in url_cite
and '' not in url_cite
):
# no need for an additional HTTP request
url = url_cite
else:
# resolve the URL with an additional HTTP request
url_to_resolve.append(url.replace('&ntb=1', '&ntb=F'))
url_to_resolve_index.append(i)
url = None # remove the result if the HTTP Bing redirect raise an exception
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# append result
results.append({'url': url, 'title': title, 'content': content})
# increment result pointer for the next iteration in this loop
i += 1
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# resolve all Bing redirections in parallel
request_list = [
Request.get(u, allow_redirects=False, headers=resp.search_params['headers']) for u in url_to_resolve
]
response_list = multi_requests(request_list)
for i, redirect_response in enumerate(response_list):
if not isinstance(redirect_response, Exception):
results[url_to_resolve_index[i]]['url'] = redirect_response.headers['location']
# get number_of_results
try:
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result_len_container = "".join(eval_xpath(dom, '//span[@class="sb_count"]//text()'))
if "-" in result_len_container:
# Remove the part "from-to" for paginated request ...
result_len_container = result_len_container[result_len_container.find("-") * 2 + 2 :]
result_len_container = re.sub('[^0-9]', '', result_len_container)
if len(result_len_container) > 0:
result_len = int(result_len_container)
except Exception as e: # pylint: disable=broad-except
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:
return []
results.append({'number_of_results': result_len})
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return results
# get supported languages from their site
def _fetch_supported_languages(resp):
lang_tags = set()
dom = html.fromstring(resp.text)
lang_links = eval_xpath(dom, '//div[@id="language-section"]//li')
for _li in lang_links:
href = eval_xpath(_li, './/@href')[0]
(_scheme, _netloc, _path, _params, query, _fragment) = urlparse(href)
query = parse_qs(query, keep_blank_values=True)
# fmt: off
setlang = query.get('setlang', [None, ])[0]
# example: 'mn-Cyrl-MN' --> '['mn', 'Cyrl-MN']
lang, nation = (setlang.split('-', maxsplit=1) + [None,])[:2] # fmt: skip
# fmt: on
tag = lang + '-' + nation if nation else lang
lang_tags.add(tag)
return list(lang_tags)
def fetch_traits(engine_traits: EngineTraits):
"""Fetch languages and regions from bing."""
# pylint: disable=import-outside-toplevel, disable=too-many-branches,
# pylint: disable=too-many-locals, too-many-statements
engine_traits.data_type = 'supported_languages' # deprecated
import babel
import babel.languages
from searx import network
from searx.locales import get_offical_locales, language_tag, region_tag
from searx.utils import gen_useragent
headers = {
'User-Agent': gen_useragent(),
'Accept-Language': "en-US,en;q=0.5", # bing needs to set the English language
}
resp = network.get('https://www.bing.com/account/general', headers=headers)
if not resp.ok:
print("ERROR: response from peertube is not OK.")
dom = html.fromstring(resp.text)
# Selector to get items from "Display language"
lang_map = {
'prs': 'fa', # Persian
'pt_BR': 'pt', # Portuguese (Brasil)
'pt_PT': 'pt', # Portuguese (Portugal)
'ca-ES-VALENCIA': 'ca', # Catalan (Spain, Valencian)
}
unknow_langs = [
'quc', # K'iche'
'nso', # Sesotho sa Leboa
'tn', # Setswana
]
for div in eval_xpath(dom, '//div[@id="limit-languages"]//input/..'):
eng_lang = eval_xpath(div, './/input/@value')[0]
if eng_lang in unknow_langs:
continue
eng_lang = lang_map.get(eng_lang, eng_lang)
label = extract_text(eval_xpath(div, './/label'))
# The 'language:xx' query string in the request function (above) does
# only support the language codes from the "Display languages" list.
# Examples of items from the "Display languages" not sopported in the
# query string: zh_Hans --> zh / sr_latn --> sr
#
# eng_lang = eng_lang.split('_')[0]
try:
sxng_tag = language_tag(babel.Locale.parse(eng_lang.replace('-', '_'), sep='_'))
except babel.UnknownLocaleError:
print("ERROR: %s (%s) is unknown by babel" % (label, eng_lang))
continue
conflict = engine_traits.languages.get(sxng_tag)
if conflict:
if conflict != eng_lang:
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_lang))
continue
engine_traits.languages[sxng_tag] = eng_lang
engine_traits.languages['zh'] = 'zh_Hans'
# regiones
for a in eval_xpath(dom, '//div[@id="region-section-content"]//li/a'):
href = eval_xpath(a, './/@href')[0]
# lang_name = extract_text(a)
query = urlparse(href)[4]
query = parse_qs(query, keep_blank_values=True)
cc = query.get('cc')[0] # pylint:disable=invalid-name
if cc == 'clear':
continue
# Assert babel supports this locales
sxng_locales = get_offical_locales(cc.upper(), engine_traits.languages.keys())
if not sxng_locales:
# print("ERROR: can't map from bing country %s (%s) to a babel region." % (a.text_content().strip(), cc))
continue
for sxng_locale in sxng_locales:
engine_traits.regions[region_tag(sxng_locale)] = cc