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311 lines
8.3 KiB
Python
311 lines
8.3 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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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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.. _XPath selector: https://quickref.me/xpath.html#xpath-selectors
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Configuration
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=============
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Request:
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- :py:obj:`search_url`
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- :py:obj:`lang_all`
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- :py:obj:`soft_max_redirects`
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- :py:obj:`cookies`
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- :py:obj:`headers`
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Paging:
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- :py:obj:`paging`
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- :py:obj:`page_size`
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- :py:obj:`first_page_num`
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Time Range:
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- :py:obj:`time_range_support`
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- :py:obj:`time_range_url`
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- :py:obj:`time_range_map`
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Safe-Search:
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- :py:obj:`safe_search_support`
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- :py:obj:`safe_search_map`
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Response:
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- :py:obj:`no_result_for_http_status`
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`XPath selector`_:
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- :py:obj:`results_xpath`
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- :py:obj:`url_xpath`
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- :py:obj:`title_xpath`
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- :py:obj:`content_xpath`
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- :py:obj:`thumbnail_xpath`
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- :py:obj:`suggestion_xpath`
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Example
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=======
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Here is a simple example of a XPath engine configured in the :ref:`settings
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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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Implementations
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===============
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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.network import raise_for_httperror
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search_url = None
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"""
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Search URL of the engine. Example::
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https://example.org/?search={query}&page={pageno}{time_range}{safe_search}
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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 paging :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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``{safe_search}``:
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Safe-search :py:obj:`URL parameter <safe_search_map>` if engine
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:py:obj:`supports safe-search <safe_search_support>`. The ``{safe_search}``
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replacement is taken from the :py:obj:`safes_search_map`. Filter results::
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0: none, 1: moderate, 2:strict
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If not supported, the URL parameter is an empty string.
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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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no_result_for_http_status = []
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'''Return empty result for these HTTP status codes instead of throwing an error.
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.. code:: yaml
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no_result_for_http_status: []
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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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cookies = {}
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'''Some engines might offer different result based on cookies.
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Possible use-case: To set safesearch cookie.'''
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headers = {}
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'''Some engines might offer different result based headers. Possible use-case:
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To set header to moderate.'''
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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 parameter 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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safe_search_support = False
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'''Engine supports safe-search.'''
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safe_search_map = {0: '&filter=none', 1: '&filter=moderate', 2: '&filter=strict'}
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'''Maps safe-search value to ``{safe_search}`` in :py:obj:`search_url`.
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.. code:: yaml
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safesearch: true
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safes_search_map:
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0: '&filter=none'
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1: '&filter=moderate'
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2: '&filter=strict'
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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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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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safe_search = ''
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if params['safesearch']:
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safe_search = safe_search_map[params['safesearch']]
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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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'safe_search': safe_search,
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}
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params['cookies'].update(cookies)
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params['headers'].update(headers)
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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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params['raise_for_httperror'] = False
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return params
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def response(resp): # pylint: disable=too-many-branches
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'''Scrap *results* from the response (see :ref:`engine results`).'''
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if no_result_for_http_status and resp.status_code in no_result_for_http_status:
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return []
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raise_for_httperror(resp)
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results = []
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dom = html.fromstring(resp.text)
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is_onion = 'onions' in categories
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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))
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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'] = cached_url + extract_text(eval_xpath_list(result, cached_xpath, min_len=1))
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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 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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{
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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,
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'is_onion': is_onion,
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}
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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 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({'url': url, 'title': title, 'content': content, 'is_onion': is_onion})
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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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