forked from zaclys/searxng
85b3723345
compile XPath only once avoid redundant call to urlparse get_locale(webapp.py): avoid useless call to request.accept_languages.best_match
144 lines
4.1 KiB
Python
144 lines
4.1 KiB
Python
"""
|
|
DuckDuckGo (Web)
|
|
|
|
@website https://duckduckgo.com/
|
|
@provide-api yes (https://duckduckgo.com/api),
|
|
but not all results from search-site
|
|
|
|
@using-api no
|
|
@results HTML (using search portal)
|
|
@stable no (HTML can change)
|
|
@parse url, title, content
|
|
|
|
@todo rewrite to api
|
|
"""
|
|
|
|
from lxml.html import fromstring
|
|
from json import loads
|
|
from searx.engines.xpath import extract_text
|
|
from searx.poolrequests import get
|
|
from searx.url_utils import urlencode
|
|
from searx.utils import match_language, eval_xpath
|
|
|
|
# engine dependent config
|
|
categories = ['general']
|
|
paging = True
|
|
language_support = True
|
|
supported_languages_url = 'https://duckduckgo.com/util/u172.js'
|
|
time_range_support = True
|
|
|
|
language_aliases = {
|
|
'ar-SA': 'ar-XA',
|
|
'es-419': 'es-XL',
|
|
'ja': 'jp-JP',
|
|
'ko': 'kr-KR',
|
|
'sl-SI': 'sl-SL',
|
|
'zh-TW': 'tzh-TW',
|
|
'zh-HK': 'tzh-HK'
|
|
}
|
|
|
|
# search-url
|
|
url = 'https://duckduckgo.com/html?{query}&s={offset}&dc={dc_param}'
|
|
time_range_url = '&df={range}'
|
|
|
|
time_range_dict = {'day': 'd',
|
|
'week': 'w',
|
|
'month': 'm'}
|
|
|
|
# specific xpath variables
|
|
result_xpath = '//div[@class="result results_links results_links_deep web-result "]' # noqa
|
|
url_xpath = './/a[@class="result__a"]/@href'
|
|
title_xpath = './/a[@class="result__a"]'
|
|
content_xpath = './/a[@class="result__snippet"]'
|
|
|
|
|
|
# match query's language to a region code that duckduckgo will accept
|
|
def get_region_code(lang, lang_list=[]):
|
|
if lang == 'all':
|
|
return None
|
|
|
|
lang_code = match_language(lang, lang_list, language_aliases, 'wt-WT')
|
|
lang_parts = lang_code.split('-')
|
|
|
|
# country code goes first
|
|
return lang_parts[1].lower() + '-' + lang_parts[0].lower()
|
|
|
|
|
|
def request(query, params):
|
|
if params['time_range'] not in (None, 'None', '') and params['time_range'] not in time_range_dict:
|
|
return params
|
|
|
|
offset = (params['pageno'] - 1) * 30
|
|
|
|
region_code = get_region_code(params['language'], supported_languages)
|
|
params['url'] = 'https://duckduckgo.com/html/'
|
|
if params['pageno'] > 1:
|
|
params['method'] = 'POST'
|
|
params['data']['q'] = query
|
|
params['data']['s'] = offset
|
|
params['data']['dc'] = 30
|
|
params['data']['nextParams'] = ''
|
|
params['data']['v'] = 'l'
|
|
params['data']['o'] = 'json'
|
|
params['data']['api'] = '/d.js'
|
|
if params['time_range'] in time_range_dict:
|
|
params['data']['df'] = time_range_dict[params['time_range']]
|
|
if region_code:
|
|
params['data']['kl'] = region_code
|
|
else:
|
|
if region_code:
|
|
params['url'] = url.format(
|
|
query=urlencode({'q': query, 'kl': region_code}), offset=offset, dc_param=offset)
|
|
else:
|
|
params['url'] = url.format(
|
|
query=urlencode({'q': query}), offset=offset, dc_param=offset)
|
|
|
|
if params['time_range'] in time_range_dict:
|
|
params['url'] += time_range_url.format(range=time_range_dict[params['time_range']])
|
|
|
|
return params
|
|
|
|
|
|
# get response from search-request
|
|
def response(resp):
|
|
results = []
|
|
|
|
doc = fromstring(resp.text)
|
|
|
|
# parse results
|
|
for i, r in enumerate(eval_xpath(doc, result_xpath)):
|
|
if i >= 30:
|
|
break
|
|
try:
|
|
res_url = eval_xpath(r, url_xpath)[-1]
|
|
except:
|
|
continue
|
|
|
|
if not res_url:
|
|
continue
|
|
|
|
title = extract_text(eval_xpath(r, title_xpath))
|
|
content = extract_text(eval_xpath(r, content_xpath))
|
|
|
|
# append result
|
|
results.append({'title': title,
|
|
'content': content,
|
|
'url': res_url})
|
|
|
|
# return results
|
|
return results
|
|
|
|
|
|
# get supported languages from their site
|
|
def _fetch_supported_languages(resp):
|
|
|
|
# response is a js file with regions as an embedded object
|
|
response_page = resp.text
|
|
response_page = response_page[response_page.find('regions:{') + 8:]
|
|
response_page = response_page[:response_page.find('}') + 1]
|
|
|
|
regions_json = loads(response_page)
|
|
supported_languages = map((lambda x: x[3:] + '-' + x[:2].upper()), regions_json.keys())
|
|
|
|
return list(supported_languages)
|