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# 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.
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
"""
from urllib.parse import urlencode
from lxml import html
from searx.utils import extract_text, extract_url, eval_xpath, eval_xpath_list
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 paramter is an empty string.
"""
lang_all='en'
'''Replacement ``{lang}`` in :py:obj:`search_url` if language ``all`` is
selected.
'''
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 = ''
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 paramter 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['url'] = search_url.format(**fargs)
params['soft_max_redirects'] = soft_max_redirects
logger.debug("query_url --> %s", params['url'])
return params
def response(resp):
'''Scrap *results* from the response (see :ref:`engine results`).
'''
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
|
