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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""Google (Scholar)
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For detailed description of the *REST-full* API see: `Query Parameter
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Definitions`_.
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.. _Query Parameter Definitions:
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https://developers.google.com/custom-search/docs/xml_results#WebSearch_Query_Parameter_Definitions
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"""
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# pylint: disable=invalid-name
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from urllib.parse import urlencode
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from datetime import datetime
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from lxml import html
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from searx.utils import (
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eval_xpath,
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eval_xpath_list,
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extract_text,
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)
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from searx.engines.google import (
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get_lang_info,
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time_range_dict,
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detect_google_sorry,
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)
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# pylint: disable=unused-import
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from searx.engines.google import (
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supported_languages_url,
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_fetch_supported_languages,
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)
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# pylint: enable=unused-import
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# about
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about = {
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"website": 'https://scholar.google.com',
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"wikidata_id": 'Q494817',
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"official_api_documentation": 'https://developers.google.com/custom-search',
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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 = ['science']
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paging = True
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language_support = True
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use_locale_domain = True
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time_range_support = True
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safesearch = False
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def time_range_url(params):
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"""Returns a URL query component for a google-Scholar time range based on
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``params['time_range']``. Google-Scholar does only support ranges in years.
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To have any effect, all the Searx ranges (*day*, *week*, *month*, *year*)
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are mapped to *year*. If no range is set, an empty string is returned.
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Example::
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&as_ylo=2019
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"""
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# as_ylo=2016&as_yhi=2019
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ret_val = ''
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if params['time_range'] in time_range_dict:
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ret_val= urlencode({'as_ylo': datetime.now().year -1 })
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return '&' + ret_val
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def request(query, params):
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"""Google-Scholar search request"""
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offset = (params['pageno'] - 1) * 10
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lang_info = get_lang_info(
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params, supported_languages, language_aliases, False
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)
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logger.debug(
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"HTTP header Accept-Language --> %s", lang_info['headers']['Accept-Language'])
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# subdomain is: scholar.google.xy
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lang_info['subdomain'] = lang_info['subdomain'].replace("www.", "scholar.")
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query_url = 'https://'+ lang_info['subdomain'] + '/scholar' + "?" + urlencode({
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'q': query,
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**lang_info['params'],
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'ie': "utf8",
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'oe': "utf8",
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'start' : offset,
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})
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query_url += time_range_url(params)
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params['url'] = query_url
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params['headers'].update(lang_info['headers'])
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params['headers']['Accept'] = (
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'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
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)
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#params['google_subdomain'] = subdomain
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return params
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def response(resp):
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"""Get response from google's search request"""
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results = []
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detect_google_sorry(resp)
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# which subdomain ?
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# subdomain = resp.search_params.get('google_subdomain')
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# convert the text to dom
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dom = html.fromstring(resp.text)
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# parse results
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for result in eval_xpath_list(dom, '//div[@class="gs_ri"]'):
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title = extract_text(eval_xpath(result, './h3[1]//a'))
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if not title:
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# this is a [ZITATION] block
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continue
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url = eval_xpath(result, './h3[1]//a/@href')[0]
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content = extract_text(eval_xpath(result, './div[@class="gs_rs"]')) or ''
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pub_info = extract_text(eval_xpath(result, './div[@class="gs_a"]'))
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if pub_info:
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content += "[%s]" % pub_info
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pub_type = extract_text(eval_xpath(result, './/span[@class="gs_ct1"]'))
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if pub_type:
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title = title + " " + pub_type
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results.append({
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'url': url,
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'title': title,
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'content': content,
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})
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# parse suggestion
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for suggestion in eval_xpath(dom, '//div[contains(@class, "gs_qsuggest_wrap")]//li//a'):
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# append suggestion
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results.append({'suggestion': extract_text(suggestion)})
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for correction in eval_xpath(dom, '//div[@class="gs_r gs_pda"]/a'):
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results.append({'correction': extract_text(correction)})
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return results
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