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https://github.com/searxng/searxng.git
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c80e82a855
Partial reverse engineering of the DuckDuckGo (DDG) engines including a
improved language and region handling based on the enigne.traits_v1 data.
- DDG Lite
- DDG Instant Answer API
- DDG Images
- DDG Weather
docs/src/searx.engine.duckduckgo.rst:
Online documentation of the DDG engines (make docs.live)
searx/data/engine_traits.json
Add data type "traits_v1" generated by the fetch_traits() functions from:
- "duckduckgo" (WEB),
- "duckduckgo images" and
- "duckduckgo weather"
and remove data from obsolete data type "supported_languages".
searx/autocomplete.py:
Reversed engineered Autocomplete from DDG. Supports DDG's languages.
searx/engines/duckduckgo.py:
- fetch_traits(): Fetch languages & regions from DDG.
- get_ddg_lang(): Get DDG's language identifier from SearXNG's locale. DDG
defines its languages by region codes. DDG-Lite does not offer a language
selection to the user, only a region can be selected by the user.
- Cache ``vqd`` value: The vqd value depends on the query string and is needed
for the follow up pages or the images loaded by a XMLHttpRequest (DDG
images). The ``vqd`` value of a search term is stored for 10min in the
redis DB.
- DDG Lite engine: reversed engineered request method with improved Language
and region support and better ``vqd`` handling.
searx/engines/duckduckgo_definitions.py: DDG Instant Answer API
The *instant answers* API does not support languages, or at least we could not
find out how language support should work. It seems that most of the features
are based on English terms.
searx/engines/duckduckgo_images.py: DDG Images
Reversed engineered request method. Improved language and region handling
based on cookies and the enigne.traits_v1 data. Response: add image format to
the result list
searx/engines/duckduckgo_weather.py: DDG Weather
Improved language and region handling based on cookies and the
enigne.traits_v1 data.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
255 lines
9.5 KiB
Python
255 lines
9.5 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""
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DuckDuckGo Instant Answer API
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The `DDG-API <https://duckduckgo.com/api>`__ is no longer documented but from
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reverse engineering we can see that some services (e.g. instant answers) still
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in use from the DDG search engine.
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As far we can say the *instant answers* API does not support languages, or at
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least we could not find out how language support should work. It seems that
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most of the features are based on English terms.
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"""
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from typing import TYPE_CHECKING
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from urllib.parse import urlencode, urlparse, urljoin
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from lxml import html
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from searx.data import WIKIDATA_UNITS
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from searx.utils import extract_text, html_to_text, get_string_replaces_function
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from searx.external_urls import get_external_url, get_earth_coordinates_url, area_to_osm_zoom
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if TYPE_CHECKING:
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import logging
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logger: logging.Logger
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# about
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about = {
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"website": 'https://duckduckgo.com/',
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"wikidata_id": 'Q12805',
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"official_api_documentation": 'https://duckduckgo.com/api',
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"use_official_api": True,
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"require_api_key": False,
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"results": 'JSON',
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}
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send_accept_language_header = True
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URL = 'https://api.duckduckgo.com/' + '?{query}&format=json&pretty=0&no_redirect=1&d=1'
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WIKIDATA_PREFIX = ['http://www.wikidata.org/entity/', 'https://www.wikidata.org/entity/']
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replace_http_by_https = get_string_replaces_function({'http:': 'https:'})
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def is_broken_text(text):
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"""duckduckgo may return something like ``<a href="xxxx">http://somewhere Related website<a/>``
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The href URL is broken, the "Related website" may contains some HTML.
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The best solution seems to ignore these results.
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"""
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return text.startswith('http') and ' ' in text
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def result_to_text(text, htmlResult):
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# TODO : remove result ending with "Meaning" or "Category" # pylint: disable=fixme
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result = None
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dom = html.fromstring(htmlResult)
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a = dom.xpath('//a')
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if len(a) >= 1:
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result = extract_text(a[0])
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else:
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result = text
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if not is_broken_text(result):
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return result
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return None
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def request(query, params):
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params['url'] = URL.format(query=urlencode({'q': query}))
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return params
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def response(resp):
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# pylint: disable=too-many-locals, too-many-branches, too-many-statements
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results = []
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search_res = resp.json()
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# search_res.get('Entity') possible values (not exhaustive) :
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# * continent / country / department / location / waterfall
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# * actor / musician / artist
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# * book / performing art / film / television / media franchise / concert tour / playwright
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# * prepared food
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# * website / software / os / programming language / file format / software engineer
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# * company
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content = ''
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heading = search_res.get('Heading', '')
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attributes = []
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urls = []
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infobox_id = None
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relatedTopics = []
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# add answer if there is one
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answer = search_res.get('Answer', '')
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if answer:
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logger.debug('AnswerType="%s" Answer="%s"', search_res.get('AnswerType'), answer)
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if search_res.get('AnswerType') not in ['calc', 'ip']:
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results.append({'answer': html_to_text(answer)})
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# add infobox
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if 'Definition' in search_res:
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content = content + search_res.get('Definition', '')
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if 'Abstract' in search_res:
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content = content + search_res.get('Abstract', '')
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# image
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image = search_res.get('Image')
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image = None if image == '' else image
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if image is not None and urlparse(image).netloc == '':
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image = urljoin('https://duckduckgo.com', image)
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# urls
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# Official website, Wikipedia page
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for ddg_result in search_res.get('Results', []):
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firstURL = ddg_result.get('FirstURL')
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text = ddg_result.get('Text')
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if firstURL is not None and text is not None:
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urls.append({'title': text, 'url': firstURL})
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results.append({'title': heading, 'url': firstURL})
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# related topics
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for ddg_result in search_res.get('RelatedTopics', []):
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if 'FirstURL' in ddg_result:
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firstURL = ddg_result.get('FirstURL')
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text = ddg_result.get('Text')
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if not is_broken_text(text):
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suggestion = result_to_text(text, ddg_result.get('Result'))
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if suggestion != heading and suggestion is not None:
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results.append({'suggestion': suggestion})
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elif 'Topics' in ddg_result:
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suggestions = []
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relatedTopics.append({'name': ddg_result.get('Name', ''), 'suggestions': suggestions})
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for topic_result in ddg_result.get('Topics', []):
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suggestion = result_to_text(topic_result.get('Text'), topic_result.get('Result'))
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if suggestion != heading and suggestion is not None:
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suggestions.append(suggestion)
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# abstract
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abstractURL = search_res.get('AbstractURL', '')
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if abstractURL != '':
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# add as result ? problem always in english
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infobox_id = abstractURL
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urls.append({'title': search_res.get('AbstractSource'), 'url': abstractURL, 'official': True})
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results.append({'url': abstractURL, 'title': heading})
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# definition
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definitionURL = search_res.get('DefinitionURL', '')
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if definitionURL != '':
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# add as result ? as answer ? problem always in english
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infobox_id = definitionURL
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urls.append({'title': search_res.get('DefinitionSource'), 'url': definitionURL})
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# to merge with wikidata's infobox
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if infobox_id:
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infobox_id = replace_http_by_https(infobox_id)
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# attributes
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# some will be converted to urls
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if 'Infobox' in search_res:
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infobox = search_res.get('Infobox')
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if 'content' in infobox:
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osm_zoom = 17
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coordinates = None
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for info in infobox.get('content'):
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data_type = info.get('data_type')
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data_label = info.get('label')
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data_value = info.get('value')
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# Workaround: ddg may return a double quote
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if data_value == '""':
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continue
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# Is it an external URL ?
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# * imdb_id / facebook_profile / youtube_channel / youtube_video / twitter_profile
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# * instagram_profile / rotten_tomatoes / spotify_artist_id / itunes_artist_id / soundcloud_id
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# * netflix_id
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external_url = get_external_url(data_type, data_value)
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if external_url is not None:
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urls.append({'title': data_label, 'url': external_url})
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elif data_type in ['instance', 'wiki_maps_trigger', 'google_play_artist_id']:
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# ignore instance: Wikidata value from "Instance Of" (Qxxxx)
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# ignore wiki_maps_trigger: reference to a javascript
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# ignore google_play_artist_id: service shutdown
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pass
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elif data_type == 'string' and data_label == 'Website':
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# There is already an URL for the website
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pass
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elif data_type == 'area':
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attributes.append({'label': data_label, 'value': area_to_str(data_value), 'entity': 'P2046'})
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osm_zoom = area_to_osm_zoom(data_value.get('amount'))
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elif data_type == 'coordinates':
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if data_value.get('globe') == 'http://www.wikidata.org/entity/Q2':
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# coordinate on Earth
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# get the zoom information from the area
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coordinates = info
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else:
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# coordinate NOT on Earth
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attributes.append({'label': data_label, 'value': data_value, 'entity': 'P625'})
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elif data_type == 'string':
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attributes.append({'label': data_label, 'value': data_value})
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if coordinates:
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data_label = coordinates.get('label')
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data_value = coordinates.get('value')
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latitude = data_value.get('latitude')
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longitude = data_value.get('longitude')
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url = get_earth_coordinates_url(latitude, longitude, osm_zoom)
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urls.append({'title': 'OpenStreetMap', 'url': url, 'entity': 'P625'})
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if len(heading) > 0:
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# TODO get infobox.meta.value where .label='article_title' # pylint: disable=fixme
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if image is None and len(attributes) == 0 and len(urls) == 1 and len(relatedTopics) == 0 and len(content) == 0:
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results.append({'url': urls[0]['url'], 'title': heading, 'content': content})
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else:
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results.append(
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{
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'infobox': heading,
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'id': infobox_id,
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'content': content,
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'img_src': image,
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'attributes': attributes,
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'urls': urls,
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'relatedTopics': relatedTopics,
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}
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)
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return results
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def unit_to_str(unit):
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for prefix in WIKIDATA_PREFIX:
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if unit.startswith(prefix):
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wikidata_entity = unit[len(prefix) :]
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return WIKIDATA_UNITS.get(wikidata_entity, unit)
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return unit
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def area_to_str(area):
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"""parse ``{'unit': 'https://www.wikidata.org/entity/Q712226', 'amount': '+20.99'}``"""
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unit = unit_to_str(area.get('unit'))
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if unit is not None:
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try:
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amount = float(area.get('amount'))
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return '{} {}'.format(amount, unit)
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except ValueError:
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pass
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return '{} {}'.format(area.get('amount', ''), area.get('unit', ''))
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