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searxng/searx/engines/startpage.py
Markus Heiser 8205f170ff [mod] pylint all engines without PYLINT_SEARXNG_DISABLE_OPTION 
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2024-03-11 14:55:38 +01:00

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# SPDX-License-Identifier: AGPL-3.0-or-later
"""Startpage's language & region selectors are a mess ..
.. _startpage regions:
Startpage regions
=================
In the list of regions there are tags we need to map to common region tags::
pt-BR_BR --> pt_BR
zh-CN_CN --> zh_Hans_CN
zh-TW_TW --> zh_Hant_TW
zh-TW_HK --> zh_Hant_HK
en-GB_GB --> en_GB
and there is at least one tag with a three letter language tag (ISO 639-2)::
fil_PH --> fil_PH
The locale code ``no_NO`` from Startpage does not exists and is mapped to
``nb-NO``::
babel.core.UnknownLocaleError: unknown locale 'no_NO'
For reference see languages-subtag at iana; ``no`` is the macrolanguage [1]_ and
W3C recommends subtag over macrolanguage [2]_.
.. [1] `iana: language-subtag-registry
<https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry>`_ ::
type: language
Subtag: nb
Description: Norwegian Bokmål
Added: 2005-10-16
Suppress-Script: Latn
Macrolanguage: no
.. [2]
Use macrolanguages with care. Some language subtags have a Scope field set to
macrolanguage, i.e. this primary language subtag encompasses a number of more
specific primary language subtags in the registry. ... As we recommended for
the collection subtags mentioned above, in most cases you should try to use
the more specific subtags ... `W3: The primary language subtag
<https://www.w3.org/International/questions/qa-choosing-language-tags#langsubtag>`_
.. _startpage languages:
Startpage languages
===================
:py:obj:`send_accept_language_header`:
The displayed name in Startpage's settings page depend on the location of the
IP when ``Accept-Language`` HTTP header is unset. In :py:obj:`fetch_traits`
we use::
'Accept-Language': "en-US,en;q=0.5",
..
to get uniform names independent from the IP).
.. _startpage categories:
Startpage categories
====================
Startpage's category (for Web-search, News, Videos, ..) is set by
:py:obj:`startpage_categ` in settings.yml::
- name: startpage
engine: startpage
startpage_categ: web
...
.. hint::
The default category is ``web`` .. and other categories than ``web`` are not
yet implemented.
"""
from typing import TYPE_CHECKING
from collections import OrderedDict
import re
from unicodedata import normalize, combining
from time import time
from datetime import datetime, timedelta
import dateutil.parser
import lxml.html
import babel
from searx.utils import extract_text, eval_xpath, gen_useragent
from searx.network import get # see https://github.com/searxng/searxng/issues/762
from searx.exceptions import SearxEngineCaptchaException
from searx.locales import region_tag
from searx.enginelib.traits import EngineTraits
if TYPE_CHECKING:
import logging
logger: logging.Logger
traits: EngineTraits
# about
about = {
"website": 'https://startpage.com',
"wikidata_id": 'Q2333295',
"official_api_documentation": None,
"use_official_api": False,
"require_api_key": False,
"results": 'HTML',
}
startpage_categ = 'web'
"""Startpage's category, visit :ref:`startpage categories`.
"""
send_accept_language_header = True
"""Startpage tries to guess user's language and territory from the HTTP
``Accept-Language``. Optional the user can select a search-language (can be
different to the UI language) and a region filter.
"""
# engine dependent config
categories = ['general', 'web']
paging = True
max_page = 18
"""Tested 18 pages maximum (argument ``page``), to be save max is set to 20."""
time_range_support = True
safesearch = True
time_range_dict = {'day': 'd', 'week': 'w', 'month': 'm', 'year': 'y'}
safesearch_dict = {0: '0', 1: '1', 2: '1'}
# search-url
base_url = 'https://www.startpage.com'
search_url = base_url + '/sp/search'
# specific xpath variables
# ads xpath //div[@id="results"]/div[@id="sponsored"]//div[@class="result"]
# not ads: div[@class="result"] are the direct childs of div[@id="results"]
results_xpath = '//div[@class="w-gl__result__main"]'
link_xpath = './/a[@class="w-gl__result-title result-link"]'
content_xpath = './/p[@class="w-gl__description"]'
search_form_xpath = '//form[@id="search"]'
"""XPath of Startpage's origin search form
.. code: html
<form action="/sp/search" method="post">
<input type="text" name="query" value="" ..>
<input type="hidden" name="t" value="device">
<input type="hidden" name="lui" value="english">
<input type="hidden" name="sc" value="Q7Mt5TRqowKB00">
<input type="hidden" name="cat" value="web">
<input type="hidden" class="abp" id="abp-input" name="abp" value="1">
</form>
"""
# timestamp of the last fetch of 'sc' code
sc_code_ts = 0
sc_code = ''
sc_code_cache_sec = 30
"""Time in seconds the sc-code is cached in memory :py:obj:`get_sc_code`."""
def get_sc_code(searxng_locale, params):
"""Get an actual ``sc`` argument from Startpage's search form (HTML page).
Startpage puts a ``sc`` argument on every HTML :py:obj:`search form
<search_form_xpath>`. Without this argument Startpage considers the request
is from a bot. We do not know what is encoded in the value of the ``sc``
argument, but it seems to be a kind of a *time-stamp*.
Startpage's search form generates a new sc-code on each request. This
function scrap a new sc-code from Startpage's home page every
:py:obj:`sc_code_cache_sec` seconds.
"""
global sc_code_ts, sc_code # pylint: disable=global-statement
if sc_code and (time() < (sc_code_ts + sc_code_cache_sec)):
logger.debug("get_sc_code: reuse '%s'", sc_code)
return sc_code
headers = {**params['headers']}
headers['Origin'] = base_url
headers['Referer'] = base_url + '/'
# headers['Connection'] = 'keep-alive'
# headers['Accept-Encoding'] = 'gzip, deflate, br'
# headers['Accept'] = 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8'
# headers['User-Agent'] = 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:105.0) Gecko/20100101 Firefox/105.0'
# add Accept-Language header
if searxng_locale == 'all':
searxng_locale = 'en-US'
locale = babel.Locale.parse(searxng_locale, sep='-')
if send_accept_language_header:
ac_lang = locale.language
if locale.territory:
ac_lang = "%s-%s,%s;q=0.9,*;q=0.5" % (
locale.language,
locale.territory,
locale.language,
)
headers['Accept-Language'] = ac_lang
get_sc_url = base_url + '/?sc=%s' % (sc_code)
logger.debug("query new sc time-stamp ... %s", get_sc_url)
logger.debug("headers: %s", headers)
resp = get(get_sc_url, headers=headers)
# ?? x = network.get('https://www.startpage.com/sp/cdn/images/filter-chevron.svg', headers=headers)
# ?? https://www.startpage.com/sp/cdn/images/filter-chevron.svg
# ?? ping-back URL: https://www.startpage.com/sp/pb?sc=TLsB0oITjZ8F21
if str(resp.url).startswith('https://www.startpage.com/sp/captcha'): # type: ignore
raise SearxEngineCaptchaException(
message="get_sc_code: got redirected to https://www.startpage.com/sp/captcha",
)
dom = lxml.html.fromstring(resp.text) # type: ignore
try:
sc_code = eval_xpath(dom, search_form_xpath + '//input[@name="sc"]/@value')[0]
except IndexError as exc:
logger.debug("suspend startpage API --> https://github.com/searxng/searxng/pull/695")
raise SearxEngineCaptchaException(
message="get_sc_code: [PR-695] query new sc time-stamp failed! (%s)" % resp.url, # type: ignore
) from exc
sc_code_ts = time()
logger.debug("get_sc_code: new value is: %s", sc_code)
return sc_code
def request(query, params):
"""Assemble a Startpage request.
To avoid CAPTCHA we need to send a well formed HTTP POST request with a
cookie. We need to form a request that is identical to the request build by
Startpage's search form:
- in the cookie the **region** is selected
- in the HTTP POST data the **language** is selected
Additionally the arguments form Startpage's search form needs to be set in
HTML POST data / compare ``<input>`` elements: :py:obj:`search_form_xpath`.
"""
if startpage_categ == 'web':
return _request_cat_web(query, params)
logger.error("Startpages's category '%' is not yet implemented.", startpage_categ)
return params
def _request_cat_web(query, params):
engine_region = traits.get_region(params['searxng_locale'], 'en-US')
engine_language = traits.get_language(params['searxng_locale'], 'en')
# build arguments
args = {
'query': query,
'cat': 'web',
't': 'device',
'sc': get_sc_code(params['searxng_locale'], params), # hint: this func needs HTTP headers,
'with_date': time_range_dict.get(params['time_range'], ''),
}
if engine_language:
args['language'] = engine_language
args['lui'] = engine_language
args['abp'] = '1'
if params['pageno'] > 1:
args['page'] = params['pageno']
# build cookie
lang_homepage = 'en'
cookie = OrderedDict()
cookie['date_time'] = 'world'
cookie['disable_family_filter'] = safesearch_dict[params['safesearch']]
cookie['disable_open_in_new_window'] = '0'
cookie['enable_post_method'] = '1' # hint: POST
cookie['enable_proxy_safety_suggest'] = '1'
cookie['enable_stay_control'] = '1'
cookie['instant_answers'] = '1'
cookie['lang_homepage'] = 's/device/%s/' % lang_homepage
cookie['num_of_results'] = '10'
cookie['suggestions'] = '1'
cookie['wt_unit'] = 'celsius'
if engine_language:
cookie['language'] = engine_language
cookie['language_ui'] = engine_language
if engine_region:
cookie['search_results_region'] = engine_region
params['cookies']['preferences'] = 'N1N'.join(["%sEEE%s" % x for x in cookie.items()])
logger.debug('cookie preferences: %s', params['cookies']['preferences'])
# POST request
logger.debug("data: %s", args)
params['data'] = args
params['method'] = 'POST'
params['url'] = search_url
params['headers']['Origin'] = base_url
params['headers']['Referer'] = base_url + '/'
# is the Accept header needed?
# params['headers']['Accept'] = 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
return params
# get response from search-request
def response(resp):
dom = lxml.html.fromstring(resp.text)
if startpage_categ == 'web':
return _response_cat_web(dom)
logger.error("Startpages's category '%' is not yet implemented.", startpage_categ)
return []
def _response_cat_web(dom):
results = []
# parse results
for result in eval_xpath(dom, results_xpath):
links = eval_xpath(result, link_xpath)
if not links:
continue
link = links[0]
url = link.attrib.get('href')
# block google-ad url's
if re.match(r"^http(s|)://(www\.)?google\.[a-z]+/aclk.*$", url):
continue
# block startpage search url's
if re.match(r"^http(s|)://(www\.)?startpage\.com/do/search\?.*$", url):
continue
title = extract_text(link)
if eval_xpath(result, content_xpath):
content: str = extract_text(eval_xpath(result, content_xpath)) # type: ignore
else:
content = ''
published_date = None
# check if search result starts with something like: "2 Sep 2014 ... "
if re.match(r"^([1-9]|[1-2][0-9]|3[0-1]) [A-Z][a-z]{2} [0-9]{4} \.\.\. ", content):
date_pos = content.find('...') + 4
date_string = content[0 : date_pos - 5]
# fix content string
content = content[date_pos:]
try:
published_date = dateutil.parser.parse(date_string, dayfirst=True)
except ValueError:
pass
# check if search result starts with something like: "5 days ago ... "
elif re.match(r"^[0-9]+ days? ago \.\.\. ", content):
date_pos = content.find('...') + 4
date_string = content[0 : date_pos - 5]
# calculate datetime
published_date = datetime.now() - timedelta(days=int(re.match(r'\d+', date_string).group())) # type: ignore
# fix content string
content = content[date_pos:]
if published_date:
# append result
results.append({'url': url, 'title': title, 'content': content, 'publishedDate': published_date})
else:
# append result
results.append({'url': url, 'title': title, 'content': content})
# return results
return results
def fetch_traits(engine_traits: EngineTraits):
"""Fetch :ref:`languages <startpage languages>` and :ref:`regions <startpage
regions>` from Startpage."""
# pylint: disable=too-many-branches
headers = {
'User-Agent': gen_useragent(),
'Accept-Language': "en-US,en;q=0.5", # bing needs to set the English language
}
resp = get('https://www.startpage.com/do/settings', headers=headers)
if not resp.ok: # type: ignore
print("ERROR: response from Startpage is not OK.")
dom = lxml.html.fromstring(resp.text) # type: ignore
# regions
sp_region_names = []
for option in dom.xpath('//form[@name="settings"]//select[@name="search_results_region"]/option'):
sp_region_names.append(option.get('value'))
for eng_tag in sp_region_names:
if eng_tag == 'all':
continue
babel_region_tag = {'no_NO': 'nb_NO'}.get(eng_tag, eng_tag) # norway
if '-' in babel_region_tag:
l, r = babel_region_tag.split('-')
r = r.split('_')[-1]
sxng_tag = region_tag(babel.Locale.parse(l + '_' + r, sep='_'))
else:
try:
sxng_tag = region_tag(babel.Locale.parse(babel_region_tag, sep='_'))
except babel.UnknownLocaleError:
print("ERROR: can't determine babel locale of startpage's locale %s" % eng_tag)
continue
conflict = engine_traits.regions.get(sxng_tag)
if conflict:
if conflict != eng_tag:
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
continue
engine_traits.regions[sxng_tag] = eng_tag
# languages
catalog_engine2code = {name.lower(): lang_code for lang_code, name in babel.Locale('en').languages.items()}
# get the native name of every language known by babel
for lang_code in filter(
lambda lang_code: lang_code.find('_') == -1, babel.localedata.locale_identifiers() # type: ignore
):
native_name = babel.Locale(lang_code).get_language_name().lower() # type: ignore
# add native name exactly as it is
catalog_engine2code[native_name] = lang_code
# add "normalized" language name (i.e. français becomes francais and español becomes espanol)
unaccented_name = ''.join(filter(lambda c: not combining(c), normalize('NFKD', native_name)))
if len(unaccented_name) == len(unaccented_name.encode()):
# add only if result is ascii (otherwise "normalization" didn't work)
catalog_engine2code[unaccented_name] = lang_code
# values that can't be determined by babel's languages names
catalog_engine2code.update(
{
# traditional chinese used in ..
'fantizhengwen': 'zh_Hant',
# Korean alphabet
'hangul': 'ko',
# Malayalam is one of 22 scheduled languages of India.
'malayam': 'ml',
'norsk': 'nb',
'sinhalese': 'si',
}
)
skip_eng_tags = {
'english_uk', # SearXNG lang 'en' already maps to 'english'
}
for option in dom.xpath('//form[@name="settings"]//select[@name="language"]/option'):
eng_tag = option.get('value')
if eng_tag in skip_eng_tags:
continue
name = extract_text(option).lower() # type: ignore
sxng_tag = catalog_engine2code.get(eng_tag)
if sxng_tag is None:
sxng_tag = catalog_engine2code[name]
conflict = engine_traits.languages.get(sxng_tag)
if conflict:
if conflict != eng_tag:
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
continue
engine_traits.languages[sxng_tag] = eng_tag
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