forked from zaclys/searxng
263 lines
9.6 KiB
Python
263 lines
9.6 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""This is the implementation of the Bing-WEB engine. Some of this
|
|
implementations are shared by other engines:
|
|
|
|
- :ref:`bing images engine`
|
|
- :ref:`bing news engine`
|
|
- :ref:`bing videos engine`
|
|
|
|
On the `preference page`_ Bing offers a lot of languages an regions (see section
|
|
LANGUAGE and COUNTRY/REGION). The Language is the language of the UI, we need
|
|
in SearXNG to get the translations of data such as *"published last week"*.
|
|
|
|
There is a description of the offical search-APIs_, unfortunately this is not
|
|
the API we can use or that bing itself would use. You can look up some things
|
|
in the API to get a better picture of bing, but the value specifications like
|
|
the market codes are usually outdated or at least no longer used by bing itself.
|
|
|
|
The market codes have been harmonized and are identical for web, video and
|
|
images. The news area has also been harmonized with the other categories. Only
|
|
political adjustments still seem to be made -- for example, there is no news
|
|
category for the Chinese market.
|
|
|
|
.. _preference page: https://www.bing.com/account/general
|
|
.. _search-APIs: https://learn.microsoft.com/en-us/bing/search-apis/
|
|
|
|
"""
|
|
# pylint: disable=too-many-branches, invalid-name
|
|
|
|
from typing import TYPE_CHECKING
|
|
import base64
|
|
import re
|
|
import time
|
|
from urllib.parse import parse_qs, urlencode, urlparse
|
|
from lxml import html
|
|
import babel
|
|
import babel.languages
|
|
|
|
from searx.utils import eval_xpath, extract_text, eval_xpath_list, eval_xpath_getindex
|
|
from searx.locales import language_tag, region_tag
|
|
from searx.enginelib.traits import EngineTraits
|
|
|
|
if TYPE_CHECKING:
|
|
import logging
|
|
|
|
logger = logging.getLogger()
|
|
|
|
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 = True
|
|
safesearch = True
|
|
"""Bing results are always SFW. To get NSFW links from bing some age
|
|
verification by a cookie is needed / thats not possible in SearXNG.
|
|
"""
|
|
|
|
base_url = 'https://www.bing.com/search'
|
|
"""Bing (Web) search URL"""
|
|
|
|
|
|
def _page_offset(pageno):
|
|
return (int(pageno) - 1) * 10 + 1
|
|
|
|
|
|
def set_bing_cookies(params, engine_language, engine_region):
|
|
params['cookies']['_EDGE_CD'] = f'm={engine_region}&u={engine_language}'
|
|
params['cookies']['_EDGE_S'] = f'mkt={engine_region}&ui={engine_language}'
|
|
logger.debug("bing cookies: %s", params['cookies'])
|
|
|
|
|
|
def request(query, params):
|
|
"""Assemble a Bing-Web request."""
|
|
|
|
engine_region = traits.get_region(params['searxng_locale'], traits.all_locale) # type: ignore
|
|
engine_language = traits.get_language(params['searxng_locale'], 'en') # type: ignore
|
|
set_bing_cookies(params, engine_language, engine_region)
|
|
|
|
page = params.get('pageno', 1)
|
|
query_params = {
|
|
'q': query,
|
|
# if arg 'pq' is missed, somtimes on page 4 we get results from page 1,
|
|
# don't ask why it is only sometimes / its M$ and they have never been
|
|
# deterministic ;)
|
|
'pq': query,
|
|
}
|
|
|
|
# To get correct page, arg first and this arg FORM is needed, the value PERE
|
|
# is on page 2, on page 3 its PERE1 and on page 4 its PERE2 .. and so forth.
|
|
# The 'first' arg should never send on page 1.
|
|
|
|
if page > 1:
|
|
query_params['first'] = _page_offset(page) # see also arg FORM
|
|
if page == 2:
|
|
query_params['FORM'] = 'PERE'
|
|
elif page > 2:
|
|
query_params['FORM'] = 'PERE%s' % (page - 2)
|
|
|
|
params['url'] = f'{base_url}?{urlencode(query_params)}'
|
|
|
|
if params.get('time_range'):
|
|
unix_day = int(time.time() / 86400)
|
|
time_ranges = {'day': '1', 'week': '2', 'month': '3', 'year': f'5_{unix_day-365}_{unix_day}'}
|
|
params['url'] += f'&filters=ex1:"ez{time_ranges[params["time_range"]]}"'
|
|
|
|
return params
|
|
|
|
|
|
def response(resp):
|
|
# pylint: disable=too-many-locals
|
|
|
|
results = []
|
|
result_len = 0
|
|
|
|
dom = html.fromstring(resp.text)
|
|
|
|
# parse results again if nothing is found yet
|
|
|
|
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)
|
|
|
|
content = eval_xpath(result, './/p')
|
|
for p in content:
|
|
# Make sure that the element is free of:
|
|
# <span class="algoSlug_icon" # data-priority="2">Web</span>
|
|
for e in p.xpath('.//span[@class="algoSlug_icon"]'):
|
|
e.getparent().remove(e)
|
|
content = extract_text(content)
|
|
|
|
# get the real URL
|
|
if url.startswith('https://www.bing.com/ck/a?'):
|
|
# get the first value of u parameter
|
|
url_query = urlparse(url).query
|
|
parsed_url_query = parse_qs(url_query)
|
|
param_u = parsed_url_query["u"][0]
|
|
# remove "a1" in front
|
|
encoded_url = param_u[2:]
|
|
# add padding
|
|
encoded_url = encoded_url + '=' * (-len(encoded_url) % 4)
|
|
# decode base64 encoded URL
|
|
url = base64.urlsafe_b64decode(encoded_url).decode()
|
|
|
|
# append result
|
|
results.append({'url': url, 'title': title, 'content': content})
|
|
|
|
# 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 _page_offset(resp.search_params.get("pageno", 0)) > result_len:
|
|
# Avoid reading more results than avalaible.
|
|
# For example, if there is 100 results from some search and we try to get results from 120 to 130,
|
|
# Bing will send back the results from 0 to 10 and no error.
|
|
# If we compare results count with the first parameter of the request we can avoid this "invalid" results.
|
|
return []
|
|
|
|
results.append({'number_of_results': result_len})
|
|
return results
|
|
|
|
|
|
def fetch_traits(engine_traits: EngineTraits):
|
|
"""Fetch languages and regions from Bing-Web."""
|
|
# pylint: disable=import-outside-toplevel
|
|
|
|
from searx.network import get # see https://github.com/searxng/searxng/issues/762
|
|
|
|
resp = get("https://www.bing.com/account/general")
|
|
if not resp.ok: # type: ignore
|
|
print("ERROR: response from bing is not OK.")
|
|
|
|
dom = html.fromstring(resp.text) # type: ignore
|
|
|
|
# languages
|
|
|
|
engine_traits.languages['zh'] = 'zh-hans'
|
|
|
|
map_lang = {'prs': 'fa-AF', 'en': 'en-us'}
|
|
bing_ui_lang_map = {
|
|
# HINT: this list probably needs to be supplemented
|
|
'en': 'us', # en --> en-us
|
|
'da': 'dk', # da --> da-dk
|
|
}
|
|
|
|
for href in eval_xpath(dom, '//div[@id="language-section"]//li/a/@href'):
|
|
eng_lang = parse_qs(urlparse(href).query)['setlang'][0]
|
|
babel_lang = map_lang.get(eng_lang, eng_lang)
|
|
try:
|
|
sxng_tag = language_tag(babel.Locale.parse(babel_lang.replace('-', '_')))
|
|
except babel.UnknownLocaleError:
|
|
print("ERROR: language (%s) is unknown by babel" % (babel_lang))
|
|
continue
|
|
# Language (e.g. 'en' or 'de') from https://www.bing.com/account/general
|
|
# is converted by bing to 'en-us' or 'de-de'. But only if there is not
|
|
# already a '-' delemitter in the language. For instance 'pt-PT' -->
|
|
# 'pt-pt' and 'pt-br' --> 'pt-br'
|
|
bing_ui_lang = eng_lang.lower()
|
|
if '-' not in bing_ui_lang:
|
|
bing_ui_lang = bing_ui_lang + '-' + bing_ui_lang_map.get(bing_ui_lang, bing_ui_lang)
|
|
|
|
conflict = engine_traits.languages.get(sxng_tag)
|
|
if conflict:
|
|
if conflict != bing_ui_lang:
|
|
print(f"CONFLICT: babel {sxng_tag} --> {conflict}, {bing_ui_lang}")
|
|
continue
|
|
engine_traits.languages[sxng_tag] = bing_ui_lang
|
|
|
|
# regions (aka "market codes")
|
|
|
|
engine_traits.regions['zh-CN'] = 'zh-cn'
|
|
|
|
map_market_codes = {
|
|
'zh-hk': 'en-hk', # not sure why, but at M$ this is the market code for Hongkong
|
|
}
|
|
for href in eval_xpath(dom, '//div[@id="region-section"]//li/a/@href'):
|
|
cc_tag = parse_qs(urlparse(href).query)['cc'][0]
|
|
if cc_tag == 'clear':
|
|
engine_traits.all_locale = cc_tag
|
|
continue
|
|
|
|
# add market codes from official languages of the country ..
|
|
for lang_tag in babel.languages.get_official_languages(cc_tag, de_facto=True):
|
|
if lang_tag not in engine_traits.languages.keys():
|
|
# print("ignore lang: %s <-- %s" % (cc_tag, lang_tag))
|
|
continue
|
|
lang_tag = lang_tag.split('_')[0] # zh_Hant --> zh
|
|
market_code = f"{lang_tag}-{cc_tag}" # zh-tw
|
|
|
|
market_code = map_market_codes.get(market_code, market_code)
|
|
sxng_tag = region_tag(babel.Locale.parse('%s_%s' % (lang_tag, cc_tag.upper())))
|
|
conflict = engine_traits.regions.get(sxng_tag)
|
|
if conflict:
|
|
if conflict != market_code:
|
|
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, market_code))
|
|
continue
|
|
engine_traits.regions[sxng_tag] = market_code
|