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[enh] google scholar - python implementation of the engine
The old xpath configuration for google scholar did not work and is replaced by a python implementation. Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This commit is contained in:
Markus Heiser
parent
e2fb500892
commit
d48e2e7b0b
4 changed files with 300 additions and 19 deletions
3
Makefile
3
Makefile
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@ -195,7 +195,8 @@ PYLINT_FILES=\
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searx/engines/google_videos.py \
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searx/engines/google_images.py \
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searx/engines/mediathekviewweb.py \
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utils/fetch_external_bangs.py
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utils/fetch_external_bangs.py \
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searx/engines/google_scholar.py
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test.pylint: pyenvinstall
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$(call cmd,pylint,$(PYLINT_FILES))
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@ -25176,6 +25176,146 @@
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"name": "\u4e2d\u6587 (\u7e41\u9ad4)"
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}
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},
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"google scholar": {
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"af": {
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"name": "Afrikaans"
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},
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"ar": {
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"name": "\u0627\u0644\u0639\u0631\u0628\u064a\u0629"
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},
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"be": {
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"name": "\u0431\u0435\u043b\u0430\u0440\u0443\u0441\u043a\u0430\u044f"
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},
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"bg": {
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"name": "\u0431\u044a\u043b\u0433\u0430\u0440\u0441\u043a\u0438"
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},
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"ca": {
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"name": "catal\u00e0"
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},
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"cs": {
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"name": "\u010de\u0161tina"
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},
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"da": {
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"name": "dansk"
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},
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"de": {
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"name": "Deutsch"
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},
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"el": {
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"name": "\u0395\u03bb\u03bb\u03b7\u03bd\u03b9\u03ba\u03ac"
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},
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"en": {
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"name": "English"
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},
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"eo": {
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"name": "esperanto"
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},
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"es": {
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"name": "espa\u00f1ol"
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},
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"et": {
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"name": "eesti"
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},
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"fa": {
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"name": "\u0641\u0627\u0631\u0633\u06cc"
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},
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"fi": {
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"name": "suomi"
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},
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"fr": {
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"name": "fran\u00e7ais"
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},
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"hi": {
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"name": "\u0939\u093f\u0928\u094d\u0926\u0940"
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},
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"hr": {
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"name": "hrvatski"
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},
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"hu": {
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"name": "magyar"
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},
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"hy": {
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"name": "\u0570\u0561\u0575\u0565\u0580\u0565\u0576"
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},
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"id": {
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"name": "Indonesia"
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},
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"is": {
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"name": "\u00edslenska"
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},
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"it": {
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"name": "italiano"
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},
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"iw": {
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"name": "\u05e2\u05d1\u05e8\u05d9\u05ea"
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},
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"ja": {
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"name": "\u65e5\u672c\u8a9e"
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},
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"ko": {
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"name": "\ud55c\uad6d\uc5b4"
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},
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"lt": {
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"name": "lietuvi\u0173"
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},
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"lv": {
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"name": "latvie\u0161u"
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},
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"nl": {
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"name": "Nederlands"
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},
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"no": {
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"name": "norsk"
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},
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"pl": {
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"name": "polski"
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},
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"pt": {
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"name": "portugu\u00eas"
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},
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"ro": {
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"name": "rom\u00e2n\u0103"
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},
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"ru": {
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"name": "\u0440\u0443\u0441\u0441\u043a\u0438\u0439"
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},
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"sk": {
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"name": "sloven\u010dina"
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},
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"sl": {
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"name": "sloven\u0161\u010dina"
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},
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"sr": {
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"name": "\u0441\u0440\u043f\u0441\u043a\u0438"
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},
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"sv": {
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"name": "svenska"
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},
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"sw": {
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"name": "Kiswahili"
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},
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"th": {
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"name": "\u0e44\u0e17\u0e22"
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},
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"tl": {
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"name": "Filipino"
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},
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"tr": {
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"name": "T\u00fcrk\u00e7e"
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},
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"uk": {
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"name": "\u0443\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430"
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},
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"vi": {
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"name": "Ti\u1ebfng Vi\u1ec7t"
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},
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"zh-CN": {
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"name": "\u4e2d\u6587 (\u7b80\u4f53)"
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},
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"zh-TW": {
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"name": "\u4e2d\u6587 (\u7e41\u9ad4)"
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}
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},
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"google videos": {
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"af": {
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"name": "Afrikaans"
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157
searx/engines/google_scholar.py
Normal file
157
searx/engines/google_scholar.py
Normal file
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@ -0,0 +1,157 @@
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# SPDX-License-Identifier: AGPL-3.0-or-later
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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, missing-function-docstring
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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 import logger
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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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logger = logger.getChild('google scholar')
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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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# pylint: disable=undefined-variable
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# params, {}, language_aliases
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params, supported_languages, language_aliases
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)
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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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'hl': lang_info['hl'],
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'lr': lang_info['lr'],
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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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logger.debug("query_url --> %s", query_url)
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params['url'] = query_url
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logger.debug("HTTP header Accept-Language --> %s", lang_info['Accept-Language'])
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params['headers']['Accept-Language'] = lang_info['Accept-Language']
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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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@ -535,25 +535,8 @@ engines:
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# android: *test_android
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- name : google scholar
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engine : xpath
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paging : True
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search_url : https://scholar.google.com/scholar?start={pageno}&q={query}&hl=en&as_sdt=0,5&as_vis=1
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results_xpath : //div[contains(@class, "gs_r")]/div[@class="gs_ri"]
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url_xpath : .//h3/a/@href
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title_xpath : .//h3/a
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content_xpath : .//div[@class="gs_rs"]
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suggestion_xpath : //div[@id="gs_res_ccl_top"]//a/b
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page_size : 10
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first_page_num : 0
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categories : science
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engine : google_scholar
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shortcut : gos
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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:
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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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- name : google play apps
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engine : xpath
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