mirror of https://github.com/searxng/searxng.git
215 lines
6.2 KiB
Python
215 lines
6.2 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-function-docstring
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"""The XPath engine is a *generic* engine with which it is possible to configure
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engines in the settings.
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Here is a simple example of a XPath engine configured in the
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:ref:`settings engine` section, further read :ref:`engines-dev`.
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.. code:: yaml
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- name : bitbucket
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engine : xpath
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paging : True
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search_url : https://bitbucket.org/repo/all/{pageno}?name={query}
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url_xpath : //article[@class="repo-summary"]//a[@class="repo-link"]/@href
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title_xpath : //article[@class="repo-summary"]//a[@class="repo-link"]
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content_xpath : //article[@class="repo-summary"]/p
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"""
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from urllib.parse import urlencode
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from lxml import html
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from searx.utils import extract_text, extract_url, eval_xpath, eval_xpath_list
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from searx import logger
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logger = logger.getChild('XPath engine')
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search_url = None
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"""
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Search URL of the engine, replacements are:
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``{query}``:
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Search terms from user.
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``{pageno}``:
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Page number if engine supports pagging :py:obj:`paging`
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``{lang}``:
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ISO 639-1 language code (en, de, fr ..)
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``{time_range}``:
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:py:obj:`URL parameter <time_range_url>` if engine :py:obj:`supports time
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range <time_range_support>`. The value for the parameter is taken from
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:py:obj:`time_range_map`.
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"""
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lang_all='en'
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'''Replacement ``{lang}`` in :py:obj:`search_url` if language ``all`` is
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selected.
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'''
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soft_max_redirects = 0
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'''Maximum redirects, soft limit. Record an error but don't stop the engine'''
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results_xpath = ''
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'''XPath selector for the list of result items'''
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url_xpath = None
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'''XPath selector of result's ``url``.'''
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content_xpath = None
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'''XPath selector of result's ``content``.'''
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title_xpath = None
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'''XPath selector of result's ``title``.'''
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thumbnail_xpath = False
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'''XPath selector of result's ``img_src``.'''
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suggestion_xpath = ''
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'''XPath selector of result's ``suggestion``.'''
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cached_xpath = ''
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cached_url = ''
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paging = False
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'''Engine supports paging [True or False].'''
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page_size = 1
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'''Number of results on each page. Only needed if the site requires not a page
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number, but an offset.'''
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first_page_num = 1
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'''Number of the first page (usually 0 or 1).'''
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time_range_support = False
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'''Engine supports search time range.'''
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time_range_url = '&hours={time_range_val}'
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'''Time range URL parameter in the in :py:obj:`search_url`. If no time range is
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requested by the user, the URL paramter is an empty string. The
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``{time_range_val}`` replacement is taken from the :py:obj:`time_range_map`.
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.. code:: yaml
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time_range_url : '&days={time_range_val}'
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'''
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time_range_map = {
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'day': 24,
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'week': 24*7,
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'month': 24*30,
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'year': 24*365,
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}
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'''Maps time range value from user to ``{time_range_val}`` in
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:py:obj:`time_range_url`.
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.. code:: yaml
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time_range_map:
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day: 1
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week: 7
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month: 30
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year: 365
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'''
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def request(query, params):
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'''Build request parameters (see :ref:`engine request`).
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'''
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lang = lang_all
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if params['language'] != 'all':
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lang = params['language'][:2]
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time_range = ''
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if params.get('time_range'):
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time_range_val = time_range_map.get(params.get('time_range'))
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time_range = time_range_url.format(time_range_val=time_range_val)
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fargs = {
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'query': urlencode({'q': query})[2:],
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'lang': lang,
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'pageno': (params['pageno'] - 1) * page_size + first_page_num,
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'time_range' : time_range,
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}
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params['url'] = search_url.format(**fargs)
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params['soft_max_redirects'] = soft_max_redirects
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logger.debug("query_url --> %s", params['url'])
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return params
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def response(resp):
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'''Scrap *results* from the response (see :ref:`engine results`).
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'''
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results = []
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dom = html.fromstring(resp.text)
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is_onion = 'onions' in categories # pylint: disable=undefined-variable
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if results_xpath:
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for result in eval_xpath_list(dom, results_xpath):
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url = extract_url(eval_xpath_list(result, url_xpath, min_len=1), search_url)
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title = extract_text(eval_xpath_list(result, title_xpath, min_len=1))
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content = extract_text(eval_xpath_list(result, content_xpath, min_len=1))
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tmp_result = {'url': url, 'title': title, 'content': content}
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# add thumbnail if available
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if thumbnail_xpath:
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thumbnail_xpath_result = eval_xpath_list(result, thumbnail_xpath)
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if len(thumbnail_xpath_result) > 0:
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tmp_result['img_src'] = extract_url(thumbnail_xpath_result, search_url)
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# add alternative cached url if available
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if cached_xpath:
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tmp_result['cached_url'] = (
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cached_url
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+ extract_text(eval_xpath_list(result, cached_xpath, min_len=1))
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)
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if is_onion:
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tmp_result['is_onion'] = True
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results.append(tmp_result)
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else:
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if cached_xpath:
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for url, title, content, cached in zip(
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(extract_url(x, search_url) for
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x in eval_xpath_list(dom, url_xpath)),
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map(extract_text, eval_xpath_list(dom, title_xpath)),
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map(extract_text, eval_xpath_list(dom, content_xpath)),
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map(extract_text, eval_xpath_list(dom, cached_xpath))
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):
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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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'cached_url': cached_url + cached, 'is_onion': is_onion
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})
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else:
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for url, title, content in zip(
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(extract_url(x, search_url) for
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x in eval_xpath_list(dom, url_xpath)),
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map(extract_text, eval_xpath_list(dom, title_xpath)),
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map(extract_text, eval_xpath_list(dom, content_xpath))
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):
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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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'is_onion': is_onion
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})
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if suggestion_xpath:
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for suggestion in eval_xpath(dom, suggestion_xpath):
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results.append({'suggestion': extract_text(suggestion)})
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logger.debug("found %s results", len(results))
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return results
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