mirror of
https://github.com/searxng/searxng
synced 2024-01-01 19:24:07 +01:00
2b48584bb4
Bing page numbering doesn't increase by 10 each time. The first page returns 10 results, and all pages thereafter return 14 results. This means we need to update the page numbering Next, the 'sc' parameter, whatever it means, needs to be present in order to not return the same results. Finally, the code to check the page had some duplicate checks, so I refactored the code in this section which is low-risk.
274 lines
10 KiB
Python
274 lines
10 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
"""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the market codes are usually outdated or at least no longer used by bing itself.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
|
|
max_page = 200
|
|
"""200 pages maximum (``&first=1991``)"""
|
|
|
|
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):
|
|
"""
|
|
Page 1 => 1 (returns 10 results)
|
|
Page 2 => 11 (returns 14 results)
|
|
Page 3 => 25 (returns 14 results)
|
|
Page 4 => 39 (returns 14 results)
|
|
"""
|
|
pageno_int = int(pageno)
|
|
if pageno_int <= 1:
|
|
return 1
|
|
return 11 + (pageno_int - 2) * 14
|
|
|
|
|
|
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,
|
|
# Unsure meaning of sc, but breaks bing if not present
|
|
'sc': '0-0',
|
|
}
|
|
|
|
# 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'
|
|
else: # 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
|