mirror of
https://github.com/searxng/searxng.git
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61383edb27
Implements a fetch_traits function for the Startpage engine. .. 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>
430 lines
14 KiB
Python
430 lines
14 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""Startpage's language & region selectors are a mess ..
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.. _startpage regions:
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Startpage regions
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=================
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In the list of regions there are tags we need to map to common region tags::
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pt-BR_BR --> pt_BR
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zh-CN_CN --> zh_Hans_CN
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zh-TW_TW --> zh_Hant_TW
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zh-TW_HK --> zh_Hant_HK
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en-GB_GB --> en_GB
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and there is at least one tag with a three letter language tag (ISO 639-2)::
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fil_PH --> fil_PH
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The locale code ``no_NO`` from Startpage does not exists and is mapped to
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``nb-NO``::
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babel.core.UnknownLocaleError: unknown locale 'no_NO'
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For reference see languages-subtag at iana; ``no`` is the macrolanguage [1]_ and
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W3C recommends subtag over macrolanguage [2]_.
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.. [1] `iana: language-subtag-registry
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<https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry>`_ ::
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type: language
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Subtag: nb
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Description: Norwegian Bokmål
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Added: 2005-10-16
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Suppress-Script: Latn
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Macrolanguage: no
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.. [2]
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Use macrolanguages with care. Some language subtags have a Scope field set to
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macrolanguage, i.e. this primary language subtag encompasses a number of more
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specific primary language subtags in the registry. ... As we recommended for
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the collection subtags mentioned above, in most cases you should try to use
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the more specific subtags ... `W3: The primary language subtag
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<https://www.w3.org/International/questions/qa-choosing-language-tags#langsubtag>`_
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.. _startpage languages:
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Startpage languages
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===================
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The displayed name in Startpage's settings page depend on the location of the IP
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when the 'Accept-Language' HTTP header is unset (in the language update script
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we use "en-US,en;q=0.5" to get uniform names independent from the IP).
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Each option has a displayed name and a value, either of which may represent the
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language name in the native script, the language name in English, an English
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transliteration of the native name, the English name of the writing script used
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by the language, or occasionally something else entirely.
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"""
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import re
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from time import time
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from urllib.parse import urlencode
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from unicodedata import normalize, combining
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from datetime import datetime, timedelta
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from dateutil import parser
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from lxml import html
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from babel import Locale
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from babel.localedata import locale_identifiers
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from searx import network
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from searx.utils import extract_text, eval_xpath, match_language
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from searx.exceptions import (
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SearxEngineResponseException,
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SearxEngineCaptchaException,
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)
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from searx.enginelib.traits import EngineTraits
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traits: EngineTraits
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# about
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about = {
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"website": 'https://startpage.com',
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"wikidata_id": 'Q2333295',
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"official_api_documentation": None,
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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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# engine dependent config
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categories = ['general', 'web']
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# there is a mechanism to block "bot" search
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# (probably the parameter qid), require
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# storing of qid's between mulitble search-calls
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paging = True
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supported_languages_url = 'https://www.startpage.com/do/settings'
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# search-url
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base_url = 'https://startpage.com/'
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search_url = base_url + 'sp/search?'
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# specific xpath variables
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# ads xpath //div[@id="results"]/div[@id="sponsored"]//div[@class="result"]
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# not ads: div[@class="result"] are the direct childs of div[@id="results"]
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results_xpath = '//div[@class="w-gl__result__main"]'
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link_xpath = './/a[@class="w-gl__result-title result-link"]'
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content_xpath = './/p[@class="w-gl__description"]'
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# timestamp of the last fetch of 'sc' code
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sc_code_ts = 0
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sc_code = ''
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def raise_captcha(resp):
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if str(resp.url).startswith('https://www.startpage.com/sp/captcha'):
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raise SearxEngineCaptchaException()
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def get_sc_code(headers):
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"""Get an actual ``sc`` argument from Startpage's home page.
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Startpage puts a ``sc`` argument on every link. Without this argument
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Startpage considers the request is from a bot. We do not know what is
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encoded in the value of the ``sc`` argument, but it seems to be a kind of a
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*time-stamp*. This *time-stamp* is valid for a few hours.
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This function scrap a new *time-stamp* from startpage's home page every hour
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(3000 sec).
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"""
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global sc_code_ts, sc_code # pylint: disable=global-statement
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if time() > (sc_code_ts + 3000):
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logger.debug("query new sc time-stamp ...")
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resp = network.get(base_url, headers=headers)
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raise_captcha(resp)
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dom = html.fromstring(resp.text)
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try:
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# <input type="hidden" name="sc" value="...">
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sc_code = eval_xpath(dom, '//input[@name="sc"]/@value')[0]
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except IndexError as exc:
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# suspend startpage API --> https://github.com/searxng/searxng/pull/695
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raise SearxEngineResponseException(
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suspended_time=7 * 24 * 3600, message="PR-695: query new sc time-stamp failed!"
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) from exc
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sc_code_ts = time()
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logger.debug("new value is: %s", sc_code)
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return sc_code
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# do search-request
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def request(query, params):
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# pylint: disable=line-too-long
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# The format string from Startpage's FFox add-on [1]::
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#
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# https://www.startpage.com/do/dsearch?query={searchTerms}&cat=web&pl=ext-ff&language=__MSG_extensionUrlLanguage__&extVersion=1.3.0
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#
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# [1] https://addons.mozilla.org/en-US/firefox/addon/startpage-private-search/
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args = {
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'query': query,
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'page': params['pageno'],
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'cat': 'web',
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# 'pl': 'ext-ff',
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# 'extVersion': '1.3.0',
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# 'abp': "-1",
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'sc': get_sc_code(params['headers']),
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}
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# set language if specified
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if params['language'] != 'all':
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lang_code = match_language(params['language'], supported_languages, fallback=None)
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if lang_code:
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language_name = supported_languages[lang_code]['alias']
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args['language'] = language_name
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args['lui'] = language_name
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params['url'] = search_url + urlencode(args)
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return params
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# get response from search-request
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def response(resp):
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results = []
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dom = html.fromstring(resp.text)
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# parse results
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for result in eval_xpath(dom, results_xpath):
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links = eval_xpath(result, link_xpath)
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if not links:
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continue
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link = links[0]
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url = link.attrib.get('href')
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# block google-ad url's
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if re.match(r"^http(s|)://(www\.)?google\.[a-z]+/aclk.*$", url):
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continue
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# block startpage search url's
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if re.match(r"^http(s|)://(www\.)?startpage\.com/do/search\?.*$", url):
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continue
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title = extract_text(link)
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if eval_xpath(result, content_xpath):
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content = extract_text(eval_xpath(result, content_xpath))
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else:
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content = ''
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published_date = None
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# check if search result starts with something like: "2 Sep 2014 ... "
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if re.match(r"^([1-9]|[1-2][0-9]|3[0-1]) [A-Z][a-z]{2} [0-9]{4} \.\.\. ", content):
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date_pos = content.find('...') + 4
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date_string = content[0 : date_pos - 5]
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# fix content string
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content = content[date_pos:]
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try:
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published_date = parser.parse(date_string, dayfirst=True)
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except ValueError:
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pass
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# check if search result starts with something like: "5 days ago ... "
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elif re.match(r"^[0-9]+ days? ago \.\.\. ", content):
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date_pos = content.find('...') + 4
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date_string = content[0 : date_pos - 5]
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# calculate datetime
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published_date = datetime.now() - timedelta(days=int(re.match(r'\d+', date_string).group()))
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# fix content string
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content = content[date_pos:]
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if published_date:
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# append result
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results.append({'url': url, 'title': title, 'content': content, 'publishedDate': published_date})
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else:
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# append result
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results.append({'url': url, 'title': title, 'content': content})
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# return results
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return results
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# get supported languages from their site
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def _fetch_supported_languages(resp):
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# startpage's language selector is a mess each option has a displayed name
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# and a value, either of which may represent the language name in the native
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# script, the language name in English, an English transliteration of the
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# native name, the English name of the writing script used by the language,
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# or occasionally something else entirely.
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# this cases are so special they need to be hardcoded, a couple of them are misspellings
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language_names = {
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'english_uk': 'en-GB',
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'fantizhengwen': ['zh-TW', 'zh-HK'],
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'hangul': 'ko',
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'malayam': 'ml',
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'norsk': 'nb',
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'sinhalese': 'si',
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'sudanese': 'su',
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}
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# get the English name of every language known by babel
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language_names.update(
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{
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# fmt: off
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name.lower(): lang_code
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# pylint: disable=protected-access
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for lang_code, name in Locale('en')._data['languages'].items()
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# fmt: on
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}
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)
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# get the native name of every language known by babel
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for lang_code in filter(lambda lang_code: lang_code.find('_') == -1, locale_identifiers()):
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native_name = Locale(lang_code).get_language_name().lower()
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# add native name exactly as it is
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language_names[native_name] = lang_code
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# add "normalized" language name (i.e. français becomes francais and español becomes espanol)
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unaccented_name = ''.join(filter(lambda c: not combining(c), normalize('NFKD', native_name)))
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if len(unaccented_name) == len(unaccented_name.encode()):
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# add only if result is ascii (otherwise "normalization" didn't work)
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language_names[unaccented_name] = lang_code
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dom = html.fromstring(resp.text)
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sp_lang_names = []
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for option in dom.xpath('//form[@name="settings"]//select[@name="language"]/option'):
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sp_lang_names.append((option.get('value'), extract_text(option).lower()))
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supported_languages = {}
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for sp_option_value, sp_option_text in sp_lang_names:
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lang_code = language_names.get(sp_option_value) or language_names.get(sp_option_text)
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if isinstance(lang_code, str):
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supported_languages[lang_code] = {'alias': sp_option_value}
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elif isinstance(lang_code, list):
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for _lc in lang_code:
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supported_languages[_lc] = {'alias': sp_option_value}
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else:
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print('Unknown language option in Startpage: {} ({})'.format(sp_option_value, sp_option_text))
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return supported_languages
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def fetch_traits(engine_traits: EngineTraits):
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"""Fetch :ref:`languages <startpage languages>` and :ref:`regions <startpage
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regions>` from Startpage."""
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# pylint: disable=import-outside-toplevel, too-many-locals, too-many-branches
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# pylint: disable=too-many-statements
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engine_traits.data_type = 'supported_languages' # deprecated
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import babel
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from searx.utils import gen_useragent
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from searx.locales import region_tag
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headers = {
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'User-Agent': gen_useragent(),
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'Accept-Language': "en-US,en;q=0.5", # bing needs to set the English language
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}
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resp = network.get('https://www.startpage.com/do/settings', headers=headers)
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if not resp.ok:
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print("ERROR: response from Startpage is not OK.")
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dom = html.fromstring(resp.text)
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# regions
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sp_region_names = []
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for option in dom.xpath('//form[@name="settings"]//select[@name="search_results_region"]/option'):
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sp_region_names.append(option.get('value'))
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for eng_tag in sp_region_names:
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if eng_tag == 'all':
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continue
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babel_region_tag = {'no_NO': 'nb_NO'}.get(eng_tag, eng_tag) # norway
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if '-' in babel_region_tag:
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l, r = babel_region_tag.split('-')
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r = r.split('_')[-1]
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sxng_tag = region_tag(babel.Locale.parse(l + '_' + r, sep='_'))
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else:
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try:
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sxng_tag = region_tag(babel.Locale.parse(babel_region_tag, sep='_'))
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except babel.UnknownLocaleError:
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print("ERROR: can't determine babel locale of startpage's locale %s" % eng_tag)
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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_tag:
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print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
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continue
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engine_traits.regions[sxng_tag] = eng_tag
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# languages
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catalog_engine2code = {name.lower(): lang_code for lang_code, name in babel.Locale('en').languages.items()}
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# get the native name of every language known by babel
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for lang_code in filter(lambda lang_code: lang_code.find('_') == -1, babel.localedata.locale_identifiers()):
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native_name = babel.Locale(lang_code).get_language_name().lower()
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# add native name exactly as it is
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catalog_engine2code[native_name] = lang_code
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# add "normalized" language name (i.e. français becomes francais and español becomes espanol)
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unaccented_name = ''.join(filter(lambda c: not combining(c), normalize('NFKD', native_name)))
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if len(unaccented_name) == len(unaccented_name.encode()):
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# add only if result is ascii (otherwise "normalization" didn't work)
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catalog_engine2code[unaccented_name] = lang_code
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# values that can't be determined by babel's languages names
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catalog_engine2code.update(
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{
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# traditional chinese used in ..
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'fantizhengwen': 'zh_Hant',
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# Korean alphabet
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'hangul': 'ko',
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# Malayalam is one of 22 scheduled languages of India.
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'malayam': 'ml',
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'norsk': 'nb',
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'sinhalese': 'si',
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}
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)
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skip_eng_tags = {
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'english_uk', # SearXNG lang 'en' already maps to 'english'
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}
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for option in dom.xpath('//form[@name="settings"]//select[@name="language"]/option'):
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eng_tag = option.get('value')
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if eng_tag in skip_eng_tags:
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continue
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name = extract_text(option).lower()
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sxng_tag = catalog_engine2code.get(eng_tag)
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if sxng_tag is None:
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sxng_tag = catalog_engine2code[name]
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conflict = engine_traits.languages.get(sxng_tag)
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if conflict:
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if conflict != eng_tag:
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print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
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continue
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engine_traits.languages[sxng_tag] = eng_tag
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