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[mod] engine duckduckgo - use DuckDuckGo-Lite
Implement a scrapper for DuckDuckGo-Lite [1]. The existing DuckDuckGo [2] engine does not support paging. DuckDuckgo-Lite is much faster, less verbose and does have a paging option (reversed engineered from the input form of [1]). [1] https://lite.duckduckgo.com/lite [2] https://duckduckgo.com/ Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This commit is contained in:
Markus Heiser
Noémi Ványi
parent
762c1c4189
commit
c218fb76b8
@ -1,16 +1,24 @@
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# SPDX-License-Identifier: AGPL-3.0-or-later
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"""
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DuckDuckGo (Web)
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# lint: pylint
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"""DuckDuckGo Lite
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"""
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from lxml.html import fromstring
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from json import loads
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from searx.utils import extract_text, match_language, eval_xpath, dict_subset
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from lxml.html import fromstring
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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.network import get
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# about
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about = {
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"website": 'https://duckduckgo.com/',
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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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@ -20,7 +28,7 @@ about = {
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# engine dependent config
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categories = ['general']
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paging = False
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paging = True
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supported_languages_url = 'https://duckduckgo.com/util/u172.js'
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time_range_support = True
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@ -34,21 +42,16 @@ language_aliases = {
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'zh-HK': 'tzh-HK'
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}
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time_range_dict = {
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'day': 'd',
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'week': 'w',
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'month': 'm',
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'year': 'y'
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}
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# search-url
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url = 'https://html.duckduckgo.com/html'
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url_ping = 'https://duckduckgo.com/t/sl_h'
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time_range_dict = {'day': 'd',
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'week': 'w',
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'month': 'm',
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'year': 'y'}
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# specific xpath variables
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result_xpath = '//div[@class="result results_links results_links_deep web-result "]' # noqa
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url_xpath = './/a[@class="result__a"]/@href'
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title_xpath = './/a[@class="result__a"]'
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content_xpath = './/a[@class="result__snippet"]'
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correction_xpath = '//div[@id="did_you_mean"]//a'
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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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@ -63,66 +66,111 @@ def get_region_code(lang, lang_list=None):
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def request(query, params):
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if params['time_range'] is not None and params['time_range'] not in time_range_dict:
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return 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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params['data']['b'] = ''
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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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# 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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params['allow_redirects'] = False
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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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if resp.status_code == 303:
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return []
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# ping
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headers_ping = dict_subset(resp.request.headers, ['User-Agent', 'Accept-Encoding', 'Accept', 'Cookie'])
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get(url_ping, headers=headers_ping)
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# parse the response
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if resp.status_code == 303:
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return []
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results = []
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doc = fromstring(resp.text)
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for i, r in enumerate(eval_xpath(doc, result_xpath)):
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if i >= 30:
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break
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try:
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res_url = eval_xpath(r, url_xpath)[-1]
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except:
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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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if not res_url:
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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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title = extract_text(eval_xpath(r, title_xpath))
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content = extract_text(eval_xpath(r, content_xpath))
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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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# append result
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results.append({'title': title,
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'content': content,
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'url': res_url})
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results.append({
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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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# parse correction
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for correction in eval_xpath(doc, correction_xpath):
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# append correction
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results.append({'correction': extract_text(correction)})
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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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