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searxng/searxng_extra/update/update_engine_descriptions.py

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#!/usr/bin/env python
# lint: pylint
# SPDX-License-Identifier: AGPL-3.0-or-later
"""Fetch website description from websites and from
:origin:`searx/engines/wikidata.py` engine.
Output file: :origin:`searx/data/engine_descriptions.json`.
"""
# pylint: disable=invalid-name, global-statement
import json
from urllib.parse import urlparse
from os.path import join
from lxml.html import fromstring
from searx.engines import wikidata, set_loggers
from searx.utils import extract_text, searx_useragent
from searx.locales import LOCALE_NAMES, locales_initialize, match_locale
from searx import searx_dir
from searx.utils import gen_useragent, detect_language
import searx.search
import searx.network
set_loggers(wikidata, 'wikidata')
locales_initialize()
# you can run the query in https://query.wikidata.org
# replace %IDS% by Wikidata entities separated by spaces with the prefix wd:
# for example wd:Q182496 wd:Q1540899
# replace %LANGUAGES_SPARQL% by languages
SPARQL_WIKIPEDIA_ARTICLE = """
SELECT DISTINCT ?item ?name ?article ?lang
WHERE {
hint:Query hint:optimizer "None".
VALUES ?item { %IDS% }
?article schema:about ?item ;
schema:inLanguage ?lang ;
schema:name ?name ;
schema:isPartOf [ wikibase:wikiGroup "wikipedia" ] .
FILTER(?lang in (%LANGUAGES_SPARQL%)) .
FILTER (!CONTAINS(?name, ':')) .
}
ORDER BY ?item ?lang
"""
SPARQL_DESCRIPTION = """
SELECT DISTINCT ?item ?itemDescription
WHERE {
VALUES ?item { %IDS% }
?item schema:description ?itemDescription .
FILTER (lang(?itemDescription) in (%LANGUAGES_SPARQL%))
}
ORDER BY ?itemLang
"""
NOT_A_DESCRIPTION = [
'web site',
'site web',
'komputa serĉilo',
'interreta serĉilo',
'bilaketa motor',
'web search engine',
'wikimedia täpsustuslehekülg',
]
SKIP_ENGINE_SOURCE = [
# fmt: off
('gitlab', 'wikidata')
# descriptions are about wikipedia disambiguation pages
# fmt: on
]
WIKIPEDIA_LANGUAGES = {}
LANGUAGES_SPARQL = ''
IDS = None
WIKIPEDIA_LANGUAGE_VARIANTS = {'zh_Hant': 'zh-tw'}
descriptions = {}
wd_to_engine_name = {}
def normalize_description(description):
for c in [chr(c) for c in range(0, 31)]:
description = description.replace(c, ' ')
description = ' '.join(description.strip().split())
return description
def update_description(engine_name, lang, description, source, replace=True):
if not isinstance(description, str):
return
description = normalize_description(description)
if description.lower() == engine_name.lower():
return
if description.lower() in NOT_A_DESCRIPTION:
return
if (engine_name, source) in SKIP_ENGINE_SOURCE:
return
if ' ' not in description:
# skip unique word description (like "website")
return
if replace or lang not in descriptions[engine_name]:
descriptions[engine_name][lang] = [description, source]
def get_wikipedia_summary(wikipedia_url, searxng_locale):
# get the REST API URL from the HTML URL
# Headers
headers = {'User-Agent': searx_useragent()}
if searxng_locale in WIKIPEDIA_LANGUAGE_VARIANTS:
headers['Accept-Language'] = WIKIPEDIA_LANGUAGE_VARIANTS.get(searxng_locale)
# URL path : from HTML URL to REST API URL
parsed_url = urlparse(wikipedia_url)
# remove the /wiki/ prefix
article_name = parsed_url.path.split('/wiki/')[1]
# article_name is already encoded but not the / which is required for the REST API call
encoded_article_name = article_name.replace('/', '%2F')
path = '/api/rest_v1/page/summary/' + encoded_article_name
wikipedia_rest_url = parsed_url._replace(path=path).geturl()
try:
response = searx.network.get(wikipedia_rest_url, headers=headers, timeout=10)
response.raise_for_status()
except Exception as e: # pylint: disable=broad-except
print(" ", wikipedia_url, e)
return None
api_result = json.loads(response.text)
return api_result.get('extract')
def get_website_description(url, lang1, lang2=None):
headers = {
'User-Agent': gen_useragent(),
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'DNT': '1',
'Upgrade-Insecure-Requests': '1',
'Sec-GPC': '1',
'Cache-Control': 'max-age=0',
}
if lang1 is not None:
lang_list = [lang1]
if lang2 is not None:
lang_list.append(lang2)
headers['Accept-Language'] = f'{",".join(lang_list)};q=0.8'
try:
response = searx.network.get(url, headers=headers, timeout=10)
response.raise_for_status()
except Exception: # pylint: disable=broad-except
return (None, None)
try:
html = fromstring(response.text)
except ValueError:
html = fromstring(response.content)
description = extract_text(html.xpath('/html/head/meta[@name="description"]/@content'))
if not description:
description = extract_text(html.xpath('/html/head/meta[@property="og:description"]/@content'))
if not description:
description = extract_text(html.xpath('/html/head/title'))
lang = extract_text(html.xpath('/html/@lang'))
if lang is None and len(lang1) > 0:
lang = lang1
lang = detect_language(description) or lang or 'en'
lang = lang.split('_')[0]
lang = lang.split('-')[0]
return (lang, description)
def initialize():
global IDS, LANGUAGES_SPARQL
searx.search.initialize()
wikipedia_engine = searx.engines.engines['wikipedia']
locale2lang = {'nl-BE': 'nl'}
for sxng_ui_lang in LOCALE_NAMES:
sxng_ui_alias = locale2lang.get(sxng_ui_lang, sxng_ui_lang)
wiki_lang = None
if sxng_ui_alias in wikipedia_engine.traits.custom['WIKIPEDIA_LANGUAGES']:
wiki_lang = sxng_ui_alias
if not wiki_lang:
wiki_lang = wikipedia_engine.traits.get_language(sxng_ui_alias)
if not wiki_lang:
print(f"WIKIPEDIA_LANGUAGES missing {sxng_ui_lang}")
continue
WIKIPEDIA_LANGUAGES[sxng_ui_lang] = wiki_lang
LANGUAGES_SPARQL = ', '.join(f"'{l}'" for l in set(WIKIPEDIA_LANGUAGES.values()))
for engine_name, engine in searx.engines.engines.items():
descriptions[engine_name] = {}
wikidata_id = getattr(engine, "about", {}).get('wikidata_id')
if wikidata_id is not None:
wd_to_engine_name.setdefault(wikidata_id, set()).add(engine_name)
IDS = ' '.join(list(map(lambda wd_id: 'wd:' + wd_id, wd_to_engine_name.keys())))
def fetch_wikidata_descriptions():
print('Fetching wikidata descriptions')
searx.network.set_timeout_for_thread(60)
result = wikidata.send_wikidata_query(
SPARQL_DESCRIPTION.replace('%IDS%', IDS).replace('%LANGUAGES_SPARQL%', LANGUAGES_SPARQL)
)
if result is not None:
for binding in result['results']['bindings']:
wikidata_id = binding['item']['value'].replace('http://www.wikidata.org/entity/', '')
wikidata_lang = binding['itemDescription']['xml:lang']
desc = binding['itemDescription']['value']
for engine_name in wd_to_engine_name[wikidata_id]:
for searxng_locale in LOCALE_NAMES:
if WIKIPEDIA_LANGUAGES[searxng_locale] != wikidata_lang:
continue
print(
f" engine: {engine_name:20} / wikidata_lang: {wikidata_lang:5}",
f"/ len(wikidata_desc): {len(desc)}",
)
update_description(engine_name, searxng_locale, desc, 'wikidata')
def fetch_wikipedia_descriptions():
print('Fetching wikipedia descriptions')
result = wikidata.send_wikidata_query(
SPARQL_WIKIPEDIA_ARTICLE.replace('%IDS%', IDS).replace('%LANGUAGES_SPARQL%', LANGUAGES_SPARQL)
)
if result is not None:
for binding in result['results']['bindings']:
wikidata_id = binding['item']['value'].replace('http://www.wikidata.org/entity/', '')
wikidata_lang = binding['name']['xml:lang']
wikipedia_url = binding['article']['value'] # for example the URL https://de.wikipedia.org/wiki/PubMed
for engine_name in wd_to_engine_name[wikidata_id]:
for searxng_locale in LOCALE_NAMES:
if WIKIPEDIA_LANGUAGES[searxng_locale] != wikidata_lang:
continue
desc = get_wikipedia_summary(wikipedia_url, searxng_locale)
if not desc:
continue
print(
f" engine: {engine_name:20} / wikidata_lang: {wikidata_lang:5}",
f"/ len(wikipedia_desc): {len(desc)}",
)
update_description(engine_name, searxng_locale, desc, 'wikipedia')
def normalize_url(url):
url = url.replace('{language}', 'en')
url = urlparse(url)._replace(path='/', params='', query='', fragment='').geturl()
url = url.replace('https://api.', 'https://')
return url
def fetch_website_description(engine_name, website):
print(f"- fetch website descr: {engine_name} / {website}")
default_lang, default_description = get_website_description(website, None, None)
if default_lang is None or default_description is None:
# the front page can't be fetched: skip this engine
return
# to specify an order in where the most common languages are in front of the
# language list ..
languages = ['en', 'es', 'pt', 'ru', 'tr', 'fr']
languages = languages + [l for l in LOCALE_NAMES if l not in languages]
previous_matched_lang = None
previous_count = 0
for lang in languages:
if lang in descriptions[engine_name]:
continue
fetched_lang, desc = get_website_description(website, lang, WIKIPEDIA_LANGUAGES[lang])
if fetched_lang is None or desc is None:
continue
# check if desc changed with the different lang values
if fetched_lang == previous_matched_lang:
previous_count += 1
if previous_count == 6:
# the website has returned the same description for 6 different languages in Accept-Language header
# stop now
break
else:
previous_matched_lang = fetched_lang
previous_count = 0
# Don't trust in the value of fetched_lang, some websites return
# for some inappropriate values, by example bing-images::
#
# requested lang: zh-Hans-CN / fetched lang: ceb / desc: 查看根据您的兴趣量身定制的提要
#
# The lang ceb is "Cebuano" but the description is given in zh-Hans-CN
print(
f" engine: {engine_name:20} / requested lang:{lang:7}"
f" / fetched lang: {fetched_lang:7} / len(desc): {len(desc)}"
)
matched_lang = match_locale(fetched_lang, LOCALE_NAMES.keys(), fallback=lang)
update_description(engine_name, matched_lang, desc, website, replace=False)
def fetch_website_descriptions():
print('Fetching website descriptions')
for engine_name, engine in searx.engines.engines.items():
website = getattr(engine, "about", {}).get('website')
if website is None and hasattr(engine, "search_url"):
website = normalize_url(getattr(engine, "search_url"))
if website is None and hasattr(engine, "base_url"):
website = normalize_url(getattr(engine, "base_url"))
if website is not None:
fetch_website_description(engine_name, website)
def get_engine_descriptions_filename():
return join(join(searx_dir, "data"), "engine_descriptions.json")
def get_output():
"""
From descriptions[engine][language] = [description, source]
To
* output[language][engine] = description_and_source
* description_and_source can be:
* [description, source]
* description (if source = "wikipedia")
* [f"engine:lang", "ref"] (reference to another existing description)
"""
output = {locale: {} for locale in LOCALE_NAMES}
seen_descriptions = {}
for engine_name, lang_descriptions in descriptions.items():
for language, description in lang_descriptions.items():
if description[0] in seen_descriptions:
ref = seen_descriptions[description[0]]
description = [f'{ref[0]}:{ref[1]}', 'ref']
else:
seen_descriptions[description[0]] = (engine_name, language)
if description[1] == 'wikipedia':
description = description[0]
output.setdefault(language, {}).setdefault(engine_name, description)
return output
def main():
initialize()
fetch_wikidata_descriptions()
fetch_wikipedia_descriptions()
fetch_website_descriptions()
output = get_output()
with open(get_engine_descriptions_filename(), 'w', encoding='utf8') as f:
f.write(json.dumps(output, indent=1, separators=(',', ':'), ensure_ascii=False))
if __name__ == "__main__":
main()
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