# SPDX-License-Identifier: AGPL-3.0-or-later
"""The JSON engine is a *generic* engine with which it is possible to configure
engines in the settings.
Configuration
=============
Request:
- :py:obj:`search_url`
- :py:obj:`lang_all`
- :py:obj:`soft_max_redirects`
- :py:obj:`method`
- :py:obj:`request_body`
- :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:`title_html_to_text`
- :py:obj:`content_html_to_text`
- :py:obj:`no_result_for_http_status`
JSON query:
- :py:obj:`results_query`
- :py:obj:`url_query`
- :py:obj:`url_prefix`
- :py:obj:`title_query`
- :py:obj:`content_query`
- :py:obj:`thumbnail_query`
- :py:obj:`thumbnail_prefix`
- :py:obj:`suggestion_query`
Example
=======
Here is a simple example of a JSON engine configure in the :ref:`settings
engine` section, further read :ref:`engines-dev`.
.. code:: yaml
- name : mdn
engine : json_engine
paging : True
search_url : https://developer.mozilla.org/api/v1/search?q={query}&page={pageno}
results_query : documents
url_query : mdn_url
url_prefix : https://developer.mozilla.org
title_query : title
content_query : summary
Implementations
===============
"""
from collections.abc import Iterable
from json import loads
from urllib.parse import urlencode
from searx.utils import to_string, html_to_text
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 paging :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'''
method = 'GET'
'''Some engines might require to do POST requests for search.'''
request_body = ''
'''The body of the request. This can only be used if different :py:obj:`method`
is set, e.g. ``POST``. For formatting see the documentation of :py:obj:`search_url`.
Note: Curly brackets which aren't encapsulating a replacement placeholder
must be escaped by doubling each ``{`` and ``}``.
.. code:: yaml
request_body: >-
{{
"search": "{query}",
"page": {pageno},
"extra": {{
"time_range": {time_range},
"rating": "{safe_search}"
}}
}}
'''
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 on cookies or headers.
Possible use-case: To set safesearch cookie or 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).'''
results_query = ''
'''JSON query for the list of result items.
The query string is a slash `/` separated path of JSON key names.
Array entries can be specified using the index or can be omitted entirely,
in which case each entry is considered -
most implementations will default to the first entry in this case.
'''
url_query = None
'''JSON query of result's ``url``. For the query string documentation see :py:obj:`results_query`'''
url_prefix = ""
'''String to prepend to the result's ``url``.'''
title_query = None
'''JSON query of result's ``title``. For the query string documentation see :py:obj:`results_query`'''
content_query = None
'''JSON query of result's ``content``. For the query string documentation see :py:obj:`results_query`'''
thumbnail_query = False
'''JSON query of result's ``thumbnail``. For the query string documentation see :py:obj:`results_query`'''
thumbnail_prefix = ''
'''String to prepend to the result's ``thumbnail``.'''
suggestion_query = ''
'''JSON query of result's ``suggestion``. For the query string documentation see :py:obj:`results_query`'''
title_html_to_text = False
'''Extract text from a HTML title string'''
content_html_to_text = False
'''Extract text from a HTML content string'''
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 iterate(iterable):
if isinstance(iterable, dict):
items = iterable.items()
else:
items = enumerate(iterable)
for index, value in items:
yield str(index), value
def is_iterable(obj):
if isinstance(obj, str):
return False
return isinstance(obj, Iterable)
def parse(query): # pylint: disable=redefined-outer-name
q = [] # pylint: disable=invalid-name
for part in query.split('/'):
if part == '':
continue
q.append(part)
return q
def do_query(data, q): # pylint: disable=invalid-name
ret = []
if not q:
return ret
qkey = q[0]
for key, value in iterate(data):
if len(q) == 1:
if key == qkey:
ret.append(value)
elif is_iterable(value):
ret.extend(do_query(value, q))
else:
if not is_iterable(value):
continue
if key == qkey:
ret.extend(do_query(value, q[1:]))
else:
ret.extend(do_query(value, q))
return ret
def query(data, query_string):
q = parse(query_string)
return do_query(data, q)
def request(query, params): # pylint: disable=redefined-outer-name
'''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']]
fp = { # pylint: disable=invalid-name
'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(**fp)
params['method'] = method
if request_body:
# don't url-encode the query if it's in the request body
fp['query'] = query
params['data'] = request_body.format(**fp)
params['soft_max_redirects'] = soft_max_redirects
params['raise_for_httperror'] = False
return params
def identity(arg):
return arg
def extract_response_info(result):
title_filter = html_to_text if title_html_to_text else identity
content_filter = html_to_text if content_html_to_text else identity
tmp_result = {}
try:
url = query(result, url_query)[0]
tmp_result['url'] = url_prefix + to_string(url)
title = query(result, title_query)[0]
tmp_result['title'] = title_filter(to_string(title))
except: # pylint: disable=bare-except
return None
try:
content = query(result, content_query)[0]
tmp_result['content'] = content_filter(to_string(content))
except: # pylint: disable=bare-except
tmp_result['content'] = ""
try:
if thumbnail_query:
thumbnail_query_result = query(result, thumbnail_query)[0]
tmp_result['thumbnail'] = thumbnail_prefix + to_string(thumbnail_query_result)
except: # pylint: disable=bare-except
pass
return tmp_result
def response(resp):
'''Scrap *results* from the response (see :ref:`engine results`).'''
results = []
if no_result_for_http_status and resp.status_code in no_result_for_http_status:
return results
raise_for_httperror(resp)
if not resp.text:
return results
json = loads(resp.text)
is_onion = 'onions' in categories
if results_query:
rs = query(json, results_query) # pylint: disable=invalid-name
if not rs:
return results
rs = rs[0] # pylint: disable=invalid-name
else:
rs = json # pylint: disable=invalid-name
for result in rs:
tmp_result = extract_response_info(result)
if not tmp_result:
continue
if is_onion:
tmp_result['is_onion'] = True
results.append(tmp_result)
if not suggestion_query:
return results
for suggestion in query(json, suggestion_query):
results.append({'suggestion': suggestion})
return results
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