mirror of
https://github.com/searxng/searxng.git
synced 2024-06-26 00:50:47 +00:00
d3aa690a7a
Implements a fetch_traits function for the Bing engines. .. note:: Does not include migration of the request methode from 'supported_languages' to 'traits' (EngineTraits) object! Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
281 lines
9.4 KiB
Python
281 lines
9.4 KiB
Python
# 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
|
||
|
||
import re
|
||
from urllib.parse import urlencode, urlparse, parse_qs
|
||
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
|
||
|
||
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',
|
||
}
|
||
|
||
# engine dependent config
|
||
categories = ['general', 'web']
|
||
paging = True
|
||
time_range_support = False
|
||
safesearch = False
|
||
send_accept_language_header = True
|
||
supported_languages_url = 'https://www.bing.com/account/general'
|
||
language_aliases = {}
|
||
|
||
# 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'
|
||
|
||
|
||
def _get_offset_from_pageno(pageno):
|
||
return (pageno - 1) * 10 + 1
|
||
|
||
|
||
def request(query, params):
|
||
|
||
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)
|
||
|
||
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)
|
||
|
||
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
|
||
|
||
|
||
def response(resp):
|
||
results = []
|
||
result_len = 0
|
||
|
||
dom = html.fromstring(resp.text)
|
||
|
||
# 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
|
||
url = link.attrib.get('href')
|
||
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)
|
||
|
||
# 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
|
||
|
||
# append result
|
||
results.append({'url': url, 'title': title, 'content': content})
|
||
# increment result pointer for the next iteration in this loop
|
||
i += 1
|
||
|
||
# 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:
|
||
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)
|
||
|
||
if result_len and _get_offset_from_pageno(resp.search_params.get("pageno", 0)) > result_len:
|
||
return []
|
||
|
||
results.append({'number_of_results': result_len})
|
||
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
|