forked from zaclys/searxng
dba8977b09
Implements a fetch_traits function for the DuckDuckGo 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>
252 lines
7.2 KiB
Python
252 lines
7.2 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""DuckDuckGo Lite
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"""
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import json
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from lxml import html
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from searx.utils import (
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dict_subset,
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eval_xpath,
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eval_xpath_getindex,
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extract_text,
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match_language,
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)
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from searx import network
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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://lite.duckduckgo.com/lite/',
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"wikidata_id": 'Q12805',
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"official_api_documentation": 'https://duckduckgo.com/api',
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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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paging = True
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supported_languages_url = 'https://duckduckgo.com/util/u588.js'
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time_range_support = True
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send_accept_language_header = True
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language_aliases = {
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'ar-SA': 'ar-XA',
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'es-419': 'es-XL',
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'ja': 'jp-JP',
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'ko': 'kr-KR',
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'sl-SI': 'sl-SL',
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'zh-TW': 'tzh-TW',
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'zh-HK': 'tzh-HK',
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}
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time_range_dict = {'day': 'd', 'week': 'w', 'month': 'm', 'year': 'y'}
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# search-url
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url = 'https://lite.duckduckgo.com/lite/'
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url_ping = 'https://duckduckgo.com/t/sl_l'
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# match query's language to a region code that duckduckgo will accept
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def get_region_code(lang, lang_list=None):
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if lang == 'all':
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return None
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lang_code = match_language(lang, lang_list or [], language_aliases, 'wt-WT')
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lang_parts = lang_code.split('-')
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# country code goes first
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return lang_parts[1].lower() + '-' + lang_parts[0].lower()
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def request(query, params):
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params['url'] = url
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params['method'] = 'POST'
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params['data']['q'] = query
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# The API is not documented, so we do some reverse engineering and emulate
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# what https://lite.duckduckgo.com/lite/ does when you press "next Page"
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# link again and again ..
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params['headers']['Content-Type'] = 'application/x-www-form-urlencoded'
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params['headers']['Referer'] = 'https://google.com/'
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# initial page does not have an offset
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if params['pageno'] == 2:
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# second page does have an offset of 30
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offset = (params['pageno'] - 1) * 30
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params['data']['s'] = offset
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params['data']['dc'] = offset + 1
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elif params['pageno'] > 2:
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# third and following pages do have an offset of 30 + n*50
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offset = 30 + (params['pageno'] - 2) * 50
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params['data']['s'] = offset
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params['data']['dc'] = offset + 1
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# initial page does not have additional data in the input form
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if params['pageno'] > 1:
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# request the second page (and more pages) needs 'o' and 'api' arguments
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params['data']['o'] = 'json'
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params['data']['api'] = 'd.js'
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# initial page does not have additional data in the input form
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if params['pageno'] > 2:
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# request the third page (and more pages) some more arguments
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params['data']['nextParams'] = ''
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params['data']['v'] = ''
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params['data']['vqd'] = ''
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region_code = get_region_code(params['language'], supported_languages)
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if region_code:
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params['data']['kl'] = region_code
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params['cookies']['kl'] = region_code
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params['data']['df'] = ''
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if params['time_range'] in time_range_dict:
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params['data']['df'] = time_range_dict[params['time_range']]
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params['cookies']['df'] = time_range_dict[params['time_range']]
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logger.debug("param data: %s", params['data'])
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logger.debug("param cookies: %s", params['cookies'])
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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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headers_ping = dict_subset(resp.request.headers, ['User-Agent', 'Accept-Encoding', 'Accept', 'Cookie'])
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network.get(url_ping, headers=headers_ping)
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if resp.status_code == 303:
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return []
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results = []
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doc = html.fromstring(resp.text)
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result_table = eval_xpath(doc, '//html/body/form/div[@class="filters"]/table')
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if not len(result_table) >= 3:
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# no more results
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return []
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result_table = result_table[2]
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tr_rows = eval_xpath(result_table, './/tr')
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# In the last <tr> is the form of the 'previous/next page' links
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tr_rows = tr_rows[:-1]
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len_tr_rows = len(tr_rows)
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offset = 0
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while len_tr_rows >= offset + 4:
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# assemble table rows we need to scrap
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tr_title = tr_rows[offset]
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tr_content = tr_rows[offset + 1]
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offset += 4
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# ignore sponsored Adds <tr class="result-sponsored">
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if tr_content.get('class') == 'result-sponsored':
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continue
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a_tag = eval_xpath_getindex(tr_title, './/td//a[@class="result-link"]', 0, None)
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if a_tag is None:
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continue
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td_content = eval_xpath_getindex(tr_content, './/td[@class="result-snippet"]', 0, None)
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if td_content is None:
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continue
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results.append(
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{
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'title': a_tag.text_content(),
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'content': extract_text(td_content),
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'url': a_tag.get('href'),
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}
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)
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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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# response is a js file with regions as an embedded object
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response_page = resp.text
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response_page = response_page[response_page.find('regions:{') + 8 :]
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response_page = response_page[: response_page.find('}') + 1]
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regions_json = json.loads(response_page)
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supported_languages = map((lambda x: x[3:] + '-' + x[:2].upper()), regions_json.keys())
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return list(supported_languages)
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def fetch_traits(engine_traits: EngineTraits):
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"""Fetch regions from DuckDuckGo."""
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# pylint: disable=import-outside-toplevel
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engine_traits.data_type = 'supported_languages' # deprecated
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import babel
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from searx.locales import region_tag
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engine_traits.all_locale = 'wt-wt'
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resp = network.get('https://duckduckgo.com/util/u588.js')
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if not resp.ok:
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print("ERROR: response from DuckDuckGo is not OK.")
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pos = resp.text.find('regions:{') + 8
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js_code = resp.text[pos:]
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pos = js_code.find('}') + 1
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regions = json.loads(js_code[:pos])
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reg_map = {
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'tw-tzh': 'zh_TW',
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'hk-tzh': 'zh_HK',
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'ct-ca': 'skip', # ct-ca and es-ca both map to ca_ES
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'es-ca': 'ca_ES',
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'id-en': 'id_ID',
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'no-no': 'nb_NO',
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'jp-jp': 'ja_JP',
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'kr-kr': 'ko_KR',
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'xa-ar': 'ar_SA',
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'sl-sl': 'sl_SI',
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'th-en': 'th_TH',
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'vn-en': 'vi_VN',
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}
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for eng_tag, name in regions.items():
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if eng_tag == 'wt-wt':
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engine_traits.all_locale = 'wt-wt'
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continue
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region = reg_map.get(eng_tag)
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if region == 'skip':
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continue
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if not region:
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eng_territory, eng_lang = eng_tag.split('-')
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region = eng_lang + '_' + eng_territory.upper()
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try:
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sxng_tag = region_tag(babel.Locale.parse(region))
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except babel.UnknownLocaleError:
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print("ERROR: %s (%s) -> %s is unknown by babel" % (name, eng_tag, region))
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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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