mirror of
https://github.com/searxng/searxng.git
synced 2024-08-23 22:50:26 +02:00
434 lines
13 KiB
Python
434 lines
13 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""
|
|
DuckDuckGo Lite
|
|
~~~~~~~~~~~~~~~
|
|
"""
|
|
|
|
from typing import TYPE_CHECKING
|
|
import re
|
|
from urllib.parse import urlencode
|
|
import json
|
|
import babel
|
|
import lxml.html
|
|
|
|
from searx import (
|
|
locales,
|
|
redislib,
|
|
external_bang,
|
|
)
|
|
from searx.utils import (
|
|
eval_xpath,
|
|
eval_xpath_getindex,
|
|
extract_text,
|
|
)
|
|
from searx.network import get # see https://github.com/searxng/searxng/issues/762
|
|
from searx import redisdb
|
|
from searx.enginelib.traits import EngineTraits
|
|
|
|
if TYPE_CHECKING:
|
|
import logging
|
|
|
|
logger: logging.Logger
|
|
|
|
traits: EngineTraits
|
|
|
|
about = {
|
|
"website": 'https://lite.duckduckgo.com/lite/',
|
|
"wikidata_id": 'Q12805',
|
|
"use_official_api": False,
|
|
"require_api_key": False,
|
|
"results": 'HTML',
|
|
}
|
|
|
|
send_accept_language_header = True
|
|
"""DuckDuckGo-Lite tries to guess user's prefered language from the HTTP
|
|
``Accept-Language``. Optional the user can select a region filter (but not a
|
|
language).
|
|
"""
|
|
|
|
# engine dependent config
|
|
categories = ['general', 'web']
|
|
paging = True
|
|
time_range_support = True
|
|
safesearch = True # user can't select but the results are filtered
|
|
|
|
url = 'https://lite.duckduckgo.com/lite/'
|
|
# url_ping = 'https://duckduckgo.com/t/sl_l'
|
|
|
|
time_range_dict = {'day': 'd', 'week': 'w', 'month': 'm', 'year': 'y'}
|
|
form_data = {'v': 'l', 'api': 'd.js', 'o': 'json'}
|
|
|
|
|
|
def cache_vqd(query, value):
|
|
"""Caches a ``vqd`` value from a query.
|
|
|
|
The vqd value depends on the query string and is needed for the follow up
|
|
pages or the images loaded by a XMLHttpRequest:
|
|
|
|
- DuckDuckGo Web: `https://links.duckduckgo.com/d.js?q=...&vqd=...`
|
|
- DuckDuckGo Images: `https://duckduckgo.com/i.js??q=...&vqd=...`
|
|
|
|
"""
|
|
c = redisdb.client()
|
|
if c:
|
|
logger.debug("cache vqd value: %s", value)
|
|
key = 'SearXNG_ddg_vqd' + redislib.secret_hash(query)
|
|
c.set(key, value, ex=600)
|
|
|
|
|
|
def get_vqd(query):
|
|
"""Returns the ``vqd`` that fits to the *query*. If there is no ``vqd`` cached
|
|
(:py:obj:`cache_vqd`) the query is sent to DDG to get a vqd value from the
|
|
response.
|
|
|
|
"""
|
|
value = None
|
|
c = redisdb.client()
|
|
if c:
|
|
key = 'SearXNG_ddg_vqd' + redislib.secret_hash(query)
|
|
value = c.get(key)
|
|
if value:
|
|
value = value.decode('utf-8')
|
|
logger.debug("re-use cached vqd value: %s", value)
|
|
return value
|
|
|
|
query_url = 'https://lite.duckduckgo.com/lite/?{args}'.format(args=urlencode({'q': query}))
|
|
res = get(query_url)
|
|
doc = lxml.html.fromstring(res.text)
|
|
value = doc.xpath("//input[@name='vqd']/@value")[0]
|
|
logger.debug("new vqd value: %s", value)
|
|
cache_vqd(query, value)
|
|
return value
|
|
|
|
|
|
def get_ddg_lang(eng_traits: EngineTraits, sxng_locale, default='en_US'):
|
|
"""Get DuckDuckGo's language identifier from SearXNG's locale.
|
|
|
|
DuckDuckGo defines its languages by region codes (see
|
|
:py:obj:`fetch_traits`).
|
|
|
|
To get region and language of a DDG service use:
|
|
|
|
.. code: python
|
|
|
|
eng_region = traits.get_region(params['searxng_locale'], traits.all_locale)
|
|
eng_lang = get_ddg_lang(traits, params['searxng_locale'])
|
|
|
|
It might confuse, but the ``l`` value of the cookie is what SearXNG calls
|
|
the *region*:
|
|
|
|
.. code:: python
|
|
|
|
# !ddi paris :es-AR --> {'ad': 'es_AR', 'ah': 'ar-es', 'l': 'ar-es'}
|
|
params['cookies']['ad'] = eng_lang
|
|
params['cookies']['ah'] = eng_region
|
|
params['cookies']['l'] = eng_region
|
|
|
|
.. hint::
|
|
|
|
`DDG-lite <https://lite.duckduckgo.com/lite>`__ does not offer a language
|
|
selection to the user, only a region can be selected by the user
|
|
(``eng_region`` from the example above). DDG-lite stores the selected
|
|
region in a cookie::
|
|
|
|
params['cookies']['kl'] = eng_region # 'ar-es'
|
|
|
|
"""
|
|
return eng_traits.custom['lang_region'].get( # type: ignore
|
|
sxng_locale, eng_traits.get_language(sxng_locale, default)
|
|
)
|
|
|
|
|
|
ddg_reg_map = {
|
|
'tw-tzh': 'zh_TW',
|
|
'hk-tzh': 'zh_HK',
|
|
'ct-ca': 'skip', # ct-ca and es-ca both map to ca_ES
|
|
'es-ca': 'ca_ES',
|
|
'id-en': 'id_ID',
|
|
'no-no': 'nb_NO',
|
|
'jp-jp': 'ja_JP',
|
|
'kr-kr': 'ko_KR',
|
|
'xa-ar': 'ar_SA',
|
|
'sl-sl': 'sl_SI',
|
|
'th-en': 'th_TH',
|
|
'vn-en': 'vi_VN',
|
|
}
|
|
|
|
ddg_lang_map = {
|
|
# use ar --> ar_EG (Egypt's arabic)
|
|
"ar_DZ": 'lang_region',
|
|
"ar_JO": 'lang_region',
|
|
"ar_SA": 'lang_region',
|
|
# use bn --> bn_BD
|
|
'bn_IN': 'lang_region',
|
|
# use de --> de_DE
|
|
'de_CH': 'lang_region',
|
|
# use en --> en_US,
|
|
'en_AU': 'lang_region',
|
|
'en_CA': 'lang_region',
|
|
'en_GB': 'lang_region',
|
|
# Esperanto
|
|
'eo_XX': 'eo',
|
|
# use es --> es_ES,
|
|
'es_AR': 'lang_region',
|
|
'es_CL': 'lang_region',
|
|
'es_CO': 'lang_region',
|
|
'es_CR': 'lang_region',
|
|
'es_EC': 'lang_region',
|
|
'es_MX': 'lang_region',
|
|
'es_PE': 'lang_region',
|
|
'es_UY': 'lang_region',
|
|
'es_VE': 'lang_region',
|
|
# use fr --> rf_FR
|
|
'fr_CA': 'lang_region',
|
|
'fr_CH': 'lang_region',
|
|
'fr_BE': 'lang_region',
|
|
# use nl --> nl_NL
|
|
'nl_BE': 'lang_region',
|
|
# use pt --> pt_PT
|
|
'pt_BR': 'lang_region',
|
|
# skip these languages
|
|
'od_IN': 'skip',
|
|
'io_XX': 'skip',
|
|
'tokipona_XX': 'skip',
|
|
}
|
|
|
|
|
|
def request(query, params):
|
|
|
|
# quote ddg bangs
|
|
query_parts = []
|
|
# for val in re.split(r'(\s+)', query):
|
|
for val in re.split(r'(\s+)', query):
|
|
if not val.strip():
|
|
continue
|
|
if val.startswith('!') and external_bang.get_node(external_bang.EXTERNAL_BANGS, val[1:]):
|
|
val = f"'{val}'"
|
|
query_parts.append(val)
|
|
query = ' '.join(query_parts)
|
|
|
|
eng_region = traits.get_region(params['searxng_locale'], traits.all_locale)
|
|
# eng_lang = get_ddg_lang(traits, params['searxng_locale'])
|
|
|
|
params['url'] = url
|
|
params['method'] = 'POST'
|
|
params['data']['q'] = query
|
|
|
|
# The API is not documented, so we do some reverse engineering and emulate
|
|
# what https://lite.duckduckgo.com/lite/ does when you press "next Page"
|
|
# link again and again ..
|
|
|
|
params['headers']['Content-Type'] = 'application/x-www-form-urlencoded'
|
|
params['headers']['Referer'] = 'https://google.com/'
|
|
|
|
# initial page does not have an offset
|
|
if params['pageno'] == 2:
|
|
# second page does have an offset of 30
|
|
offset = (params['pageno'] - 1) * 30
|
|
params['data']['s'] = offset
|
|
params['data']['dc'] = offset + 1
|
|
|
|
elif params['pageno'] > 2:
|
|
# third and following pages do have an offset of 30 + n*50
|
|
offset = 30 + (params['pageno'] - 2) * 50
|
|
params['data']['s'] = offset
|
|
params['data']['dc'] = offset + 1
|
|
|
|
# request needs a vqd argument
|
|
params['data']['vqd'] = get_vqd(query)
|
|
|
|
# initial page does not have additional data in the input form
|
|
if params['pageno'] > 1:
|
|
|
|
params['data']['o'] = form_data.get('o', 'json')
|
|
params['data']['api'] = form_data.get('api', 'd.js')
|
|
params['data']['nextParams'] = form_data.get('nextParams', '')
|
|
params['data']['v'] = form_data.get('v', 'l')
|
|
|
|
params['data']['kl'] = eng_region
|
|
params['cookies']['kl'] = eng_region
|
|
|
|
params['data']['df'] = ''
|
|
if params['time_range'] in time_range_dict:
|
|
params['data']['df'] = time_range_dict[params['time_range']]
|
|
params['cookies']['df'] = time_range_dict[params['time_range']]
|
|
|
|
logger.debug("param data: %s", params['data'])
|
|
logger.debug("param cookies: %s", params['cookies'])
|
|
return params
|
|
|
|
|
|
def response(resp):
|
|
|
|
if resp.status_code == 303:
|
|
return []
|
|
|
|
results = []
|
|
doc = lxml.html.fromstring(resp.text)
|
|
|
|
result_table = eval_xpath(doc, '//html/body/form/div[@class="filters"]/table')
|
|
|
|
if len(result_table) == 2:
|
|
# some locales (at least China) does not have a "next page" button and
|
|
# the layout of the HTML tables is different.
|
|
result_table = result_table[1]
|
|
elif not len(result_table) >= 3:
|
|
# no more results
|
|
return []
|
|
else:
|
|
result_table = result_table[2]
|
|
# update form data from response
|
|
form = eval_xpath(doc, '//html/body/form/div[@class="filters"]/table//input/..')
|
|
if len(form):
|
|
|
|
form = form[0]
|
|
form_data['v'] = eval_xpath(form, '//input[@name="v"]/@value')[0]
|
|
form_data['api'] = eval_xpath(form, '//input[@name="api"]/@value')[0]
|
|
form_data['o'] = eval_xpath(form, '//input[@name="o"]/@value')[0]
|
|
logger.debug('form_data: %s', form_data)
|
|
|
|
value = eval_xpath(form, '//input[@name="vqd"]/@value')[0]
|
|
query = resp.search_params['data']['q']
|
|
cache_vqd(query, value)
|
|
|
|
tr_rows = eval_xpath(result_table, './/tr')
|
|
# In the last <tr> is the form of the 'previous/next page' links
|
|
tr_rows = tr_rows[:-1]
|
|
|
|
len_tr_rows = len(tr_rows)
|
|
offset = 0
|
|
|
|
while len_tr_rows >= offset + 4:
|
|
|
|
# assemble table rows we need to scrap
|
|
tr_title = tr_rows[offset]
|
|
tr_content = tr_rows[offset + 1]
|
|
offset += 4
|
|
|
|
# ignore sponsored Adds <tr class="result-sponsored">
|
|
if tr_content.get('class') == 'result-sponsored':
|
|
continue
|
|
|
|
a_tag = eval_xpath_getindex(tr_title, './/td//a[@class="result-link"]', 0, None)
|
|
if a_tag is None:
|
|
continue
|
|
|
|
td_content = eval_xpath_getindex(tr_content, './/td[@class="result-snippet"]', 0, None)
|
|
if td_content is None:
|
|
continue
|
|
|
|
results.append(
|
|
{
|
|
'title': a_tag.text_content(),
|
|
'content': extract_text(td_content),
|
|
'url': a_tag.get('href'),
|
|
}
|
|
)
|
|
|
|
return results
|
|
|
|
|
|
def fetch_traits(engine_traits: EngineTraits):
|
|
"""Fetch languages & regions from DuckDuckGo.
|
|
|
|
SearXNG's ``all`` locale maps DuckDuckGo's "Alle regions" (``wt-wt``).
|
|
DuckDuckGo's language "Browsers prefered language" (``wt_WT``) makes no
|
|
sense in a SearXNG request since SearXNG's ``all`` will not add a
|
|
``Accept-Language`` HTTP header. The value in ``engine_traits.all_locale``
|
|
is ``wt-wt`` (the region).
|
|
|
|
Beside regions DuckDuckGo also defines its languages by region codes. By
|
|
example these are the english languages in DuckDuckGo:
|
|
|
|
- en_US
|
|
- en_AU
|
|
- en_CA
|
|
- en_GB
|
|
|
|
The function :py:obj:`get_ddg_lang` evaluates DuckDuckGo's language from
|
|
SearXNG's locale.
|
|
|
|
"""
|
|
# pylint: disable=too-many-branches, too-many-statements
|
|
# fetch regions
|
|
|
|
engine_traits.all_locale = 'wt-wt'
|
|
|
|
# updated from u588 to u661 / should be updated automatically?
|
|
resp = get('https://duckduckgo.com/util/u661.js')
|
|
|
|
if not resp.ok: # type: ignore
|
|
print("ERROR: response from DuckDuckGo is not OK.")
|
|
|
|
pos = resp.text.find('regions:{') + 8 # type: ignore
|
|
js_code = resp.text[pos:] # type: ignore
|
|
pos = js_code.find('}') + 1
|
|
regions = json.loads(js_code[:pos])
|
|
|
|
for eng_tag, name in regions.items():
|
|
|
|
if eng_tag == 'wt-wt':
|
|
engine_traits.all_locale = 'wt-wt'
|
|
continue
|
|
|
|
region = ddg_reg_map.get(eng_tag)
|
|
if region == 'skip':
|
|
continue
|
|
|
|
if not region:
|
|
eng_territory, eng_lang = eng_tag.split('-')
|
|
region = eng_lang + '_' + eng_territory.upper()
|
|
|
|
try:
|
|
sxng_tag = locales.region_tag(babel.Locale.parse(region))
|
|
except babel.UnknownLocaleError:
|
|
print("ERROR: %s (%s) -> %s is unknown by babel" % (name, eng_tag, region))
|
|
continue
|
|
|
|
conflict = engine_traits.regions.get(sxng_tag)
|
|
if conflict:
|
|
if conflict != eng_tag:
|
|
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
|
|
continue
|
|
engine_traits.regions[sxng_tag] = eng_tag
|
|
|
|
# fetch languages
|
|
|
|
engine_traits.custom['lang_region'] = {}
|
|
|
|
pos = resp.text.find('languages:{') + 10 # type: ignore
|
|
js_code = resp.text[pos:] # type: ignore
|
|
pos = js_code.find('}') + 1
|
|
js_code = '{"' + js_code[1:pos].replace(':', '":').replace(',', ',"')
|
|
languages = json.loads(js_code)
|
|
|
|
for eng_lang, name in languages.items():
|
|
|
|
if eng_lang == 'wt_WT':
|
|
continue
|
|
|
|
babel_tag = ddg_lang_map.get(eng_lang, eng_lang)
|
|
if babel_tag == 'skip':
|
|
continue
|
|
|
|
try:
|
|
|
|
if babel_tag == 'lang_region':
|
|
sxng_tag = locales.region_tag(babel.Locale.parse(eng_lang))
|
|
engine_traits.custom['lang_region'][sxng_tag] = eng_lang
|
|
continue
|
|
|
|
sxng_tag = locales.language_tag(babel.Locale.parse(babel_tag))
|
|
|
|
except babel.UnknownLocaleError:
|
|
print("ERROR: language %s (%s) is unknown by babel" % (name, eng_lang))
|
|
continue
|
|
|
|
conflict = engine_traits.languages.get(sxng_tag)
|
|
if conflict:
|
|
if conflict != eng_lang:
|
|
print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_lang))
|
|
continue
|
|
engine_traits.languages[sxng_tag] = eng_lang
|