mirror of
https://github.com/searxng/searxng.git
synced 2024-12-27 03:30:30 +00:00
5720844fcd
We have built up detailed documentation of the *settings* and the *engines* over the past few years. However, this documentation was still spread over various chapters and was difficult to navigate in its entirety. This patch rearranges the Settings & Engines documentation for better readability. To review new ordered docs:: make docs.clean docs.live Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
311 lines
8.3 KiB
Python
311 lines
8.3 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""The XPath engine is a *generic* engine with which it is possible to configure
|
|
engines in the settings.
|
|
|
|
.. _XPath selector: https://quickref.me/xpath.html#xpath-selectors
|
|
|
|
Configuration
|
|
=============
|
|
|
|
Request:
|
|
|
|
- :py:obj:`search_url`
|
|
- :py:obj:`lang_all`
|
|
- :py:obj:`soft_max_redirects`
|
|
- :py:obj:`cookies`
|
|
- :py:obj:`headers`
|
|
|
|
Paging:
|
|
|
|
- :py:obj:`paging`
|
|
- :py:obj:`page_size`
|
|
- :py:obj:`first_page_num`
|
|
|
|
Time Range:
|
|
|
|
- :py:obj:`time_range_support`
|
|
- :py:obj:`time_range_url`
|
|
- :py:obj:`time_range_map`
|
|
|
|
Safe-Search:
|
|
|
|
- :py:obj:`safe_search_support`
|
|
- :py:obj:`safe_search_map`
|
|
|
|
Response:
|
|
|
|
- :py:obj:`no_result_for_http_status`
|
|
|
|
`XPath selector`_:
|
|
|
|
- :py:obj:`results_xpath`
|
|
- :py:obj:`url_xpath`
|
|
- :py:obj:`title_xpath`
|
|
- :py:obj:`content_xpath`
|
|
- :py:obj:`thumbnail_xpath`
|
|
- :py:obj:`suggestion_xpath`
|
|
|
|
|
|
Example
|
|
=======
|
|
|
|
Here is a simple example of a XPath engine configured in the :ref:`settings
|
|
engine` section, further read :ref:`engines-dev`.
|
|
|
|
.. code:: yaml
|
|
|
|
- name : bitbucket
|
|
engine : xpath
|
|
paging : True
|
|
search_url : https://bitbucket.org/repo/all/{pageno}?name={query}
|
|
url_xpath : //article[@class="repo-summary"]//a[@class="repo-link"]/@href
|
|
title_xpath : //article[@class="repo-summary"]//a[@class="repo-link"]
|
|
content_xpath : //article[@class="repo-summary"]/p
|
|
|
|
Implementations
|
|
===============
|
|
|
|
"""
|
|
|
|
from urllib.parse import urlencode
|
|
|
|
from lxml import html
|
|
from searx.utils import extract_text, extract_url, eval_xpath, eval_xpath_list
|
|
from searx.network import raise_for_httperror
|
|
|
|
search_url = None
|
|
"""
|
|
Search URL of the engine. Example::
|
|
|
|
https://example.org/?search={query}&page={pageno}{time_range}{safe_search}
|
|
|
|
Replacements are:
|
|
|
|
``{query}``:
|
|
Search terms from user.
|
|
|
|
``{pageno}``:
|
|
Page number if engine supports pagging :py:obj:`paging`
|
|
|
|
``{lang}``:
|
|
ISO 639-1 language code (en, de, fr ..)
|
|
|
|
``{time_range}``:
|
|
:py:obj:`URL parameter <time_range_url>` if engine :py:obj:`supports time
|
|
range <time_range_support>`. The value for the parameter is taken from
|
|
:py:obj:`time_range_map`.
|
|
|
|
``{safe_search}``:
|
|
Safe-search :py:obj:`URL parameter <safe_search_map>` if engine
|
|
:py:obj:`supports safe-search <safe_search_support>`. The ``{safe_search}``
|
|
replacement is taken from the :py:obj:`safes_search_map`. Filter results::
|
|
|
|
0: none, 1: moderate, 2:strict
|
|
|
|
If not supported, the URL parameter is an empty string.
|
|
|
|
"""
|
|
|
|
lang_all = 'en'
|
|
'''Replacement ``{lang}`` in :py:obj:`search_url` if language ``all`` is
|
|
selected.
|
|
'''
|
|
|
|
no_result_for_http_status = []
|
|
'''Return empty result for these HTTP status codes instead of throwing an error.
|
|
|
|
.. code:: yaml
|
|
|
|
no_result_for_http_status: []
|
|
'''
|
|
|
|
soft_max_redirects = 0
|
|
'''Maximum redirects, soft limit. Record an error but don't stop the engine'''
|
|
|
|
results_xpath = ''
|
|
'''`XPath selector`_ for the list of result items'''
|
|
|
|
url_xpath = None
|
|
'''`XPath selector`_ of result's ``url``.'''
|
|
|
|
content_xpath = None
|
|
'''`XPath selector`_ of result's ``content``.'''
|
|
|
|
title_xpath = None
|
|
'''`XPath selector`_ of result's ``title``.'''
|
|
|
|
thumbnail_xpath = False
|
|
'''`XPath selector`_ of result's ``img_src``.'''
|
|
|
|
suggestion_xpath = ''
|
|
'''`XPath selector`_ of result's ``suggestion``.'''
|
|
|
|
cached_xpath = ''
|
|
cached_url = ''
|
|
|
|
cookies = {}
|
|
'''Some engines might offer different result based on cookies.
|
|
Possible use-case: To set safesearch cookie.'''
|
|
|
|
headers = {}
|
|
'''Some engines might offer different result based headers. Possible use-case:
|
|
To set header to moderate.'''
|
|
|
|
paging = False
|
|
'''Engine supports paging [True or False].'''
|
|
|
|
page_size = 1
|
|
'''Number of results on each page. Only needed if the site requires not a page
|
|
number, but an offset.'''
|
|
|
|
first_page_num = 1
|
|
'''Number of the first page (usually 0 or 1).'''
|
|
|
|
time_range_support = False
|
|
'''Engine supports search time range.'''
|
|
|
|
time_range_url = '&hours={time_range_val}'
|
|
'''Time range URL parameter in the in :py:obj:`search_url`. If no time range is
|
|
requested by the user, the URL parameter is an empty string. The
|
|
``{time_range_val}`` replacement is taken from the :py:obj:`time_range_map`.
|
|
|
|
.. code:: yaml
|
|
|
|
time_range_url : '&days={time_range_val}'
|
|
'''
|
|
|
|
time_range_map = {
|
|
'day': 24,
|
|
'week': 24 * 7,
|
|
'month': 24 * 30,
|
|
'year': 24 * 365,
|
|
}
|
|
'''Maps time range value from user to ``{time_range_val}`` in
|
|
:py:obj:`time_range_url`.
|
|
|
|
.. code:: yaml
|
|
|
|
time_range_map:
|
|
day: 1
|
|
week: 7
|
|
month: 30
|
|
year: 365
|
|
'''
|
|
|
|
safe_search_support = False
|
|
'''Engine supports safe-search.'''
|
|
|
|
safe_search_map = {0: '&filter=none', 1: '&filter=moderate', 2: '&filter=strict'}
|
|
'''Maps safe-search value to ``{safe_search}`` in :py:obj:`search_url`.
|
|
|
|
.. code:: yaml
|
|
|
|
safesearch: true
|
|
safes_search_map:
|
|
0: '&filter=none'
|
|
1: '&filter=moderate'
|
|
2: '&filter=strict'
|
|
|
|
'''
|
|
|
|
|
|
def request(query, params):
|
|
'''Build request parameters (see :ref:`engine request`).'''
|
|
lang = lang_all
|
|
if params['language'] != 'all':
|
|
lang = params['language'][:2]
|
|
|
|
time_range = ''
|
|
if params.get('time_range'):
|
|
time_range_val = time_range_map.get(params.get('time_range'))
|
|
time_range = time_range_url.format(time_range_val=time_range_val)
|
|
|
|
safe_search = ''
|
|
if params['safesearch']:
|
|
safe_search = safe_search_map[params['safesearch']]
|
|
|
|
fargs = {
|
|
'query': urlencode({'q': query})[2:],
|
|
'lang': lang,
|
|
'pageno': (params['pageno'] - 1) * page_size + first_page_num,
|
|
'time_range': time_range,
|
|
'safe_search': safe_search,
|
|
}
|
|
|
|
params['cookies'].update(cookies)
|
|
params['headers'].update(headers)
|
|
|
|
params['url'] = search_url.format(**fargs)
|
|
params['soft_max_redirects'] = soft_max_redirects
|
|
|
|
params['raise_for_httperror'] = False
|
|
|
|
return params
|
|
|
|
|
|
def response(resp): # pylint: disable=too-many-branches
|
|
'''Scrap *results* from the response (see :ref:`engine results`).'''
|
|
if no_result_for_http_status and resp.status_code in no_result_for_http_status:
|
|
return []
|
|
|
|
raise_for_httperror(resp)
|
|
|
|
results = []
|
|
dom = html.fromstring(resp.text)
|
|
is_onion = 'onions' in categories
|
|
|
|
if results_xpath:
|
|
for result in eval_xpath_list(dom, results_xpath):
|
|
|
|
url = extract_url(eval_xpath_list(result, url_xpath, min_len=1), search_url)
|
|
title = extract_text(eval_xpath_list(result, title_xpath, min_len=1))
|
|
content = extract_text(eval_xpath_list(result, content_xpath))
|
|
tmp_result = {'url': url, 'title': title, 'content': content}
|
|
|
|
# add thumbnail if available
|
|
if thumbnail_xpath:
|
|
thumbnail_xpath_result = eval_xpath_list(result, thumbnail_xpath)
|
|
if len(thumbnail_xpath_result) > 0:
|
|
tmp_result['img_src'] = extract_url(thumbnail_xpath_result, search_url)
|
|
|
|
# add alternative cached url if available
|
|
if cached_xpath:
|
|
tmp_result['cached_url'] = cached_url + extract_text(eval_xpath_list(result, cached_xpath, min_len=1))
|
|
|
|
if is_onion:
|
|
tmp_result['is_onion'] = True
|
|
|
|
results.append(tmp_result)
|
|
|
|
else:
|
|
if cached_xpath:
|
|
for url, title, content, cached in zip(
|
|
(extract_url(x, search_url) for x in eval_xpath_list(dom, url_xpath)),
|
|
map(extract_text, eval_xpath_list(dom, title_xpath)),
|
|
map(extract_text, eval_xpath_list(dom, content_xpath)),
|
|
map(extract_text, eval_xpath_list(dom, cached_xpath)),
|
|
):
|
|
results.append(
|
|
{
|
|
'url': url,
|
|
'title': title,
|
|
'content': content,
|
|
'cached_url': cached_url + cached,
|
|
'is_onion': is_onion,
|
|
}
|
|
)
|
|
else:
|
|
for url, title, content in zip(
|
|
(extract_url(x, search_url) for x in eval_xpath_list(dom, url_xpath)),
|
|
map(extract_text, eval_xpath_list(dom, title_xpath)),
|
|
map(extract_text, eval_xpath_list(dom, content_xpath)),
|
|
):
|
|
results.append({'url': url, 'title': title, 'content': content, 'is_onion': is_onion})
|
|
|
|
if suggestion_xpath:
|
|
for suggestion in eval_xpath(dom, suggestion_xpath):
|
|
results.append({'suggestion': extract_text(suggestion)})
|
|
|
|
logger.debug("found %s results", len(results))
|
|
return results
|