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https://github.com/searxng/searxng
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328 lines
11 KiB
Python
328 lines
11 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""This module implements the Wikipedia engine. Some of this implementations
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are shared by other engines:
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- :ref:`wikidata engine`
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The list of supported languages is :py:obj:`fetched <fetch_wikimedia_traits>` from
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the article linked by :py:obj:`list_of_wikipedias`.
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Unlike traditional search engines, wikipedia does not support one Wikipedia for
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all languages, but there is one Wikipedia for each supported language. Some of
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these Wikipedias have a LanguageConverter_ enabled
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(:py:obj:`rest_v1_summary_url`).
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A LanguageConverter_ (LC) is a system based on language variants that
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automatically converts the content of a page into a different variant. A variant
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is mostly the same language in a different script.
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- `Wikipedias in multiple writing systems`_
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- `Automatic conversion between traditional and simplified Chinese characters`_
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PR-2554_:
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The Wikipedia link returned by the API is still the same in all cases
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(`https://zh.wikipedia.org/wiki/出租車`_) but if your browser's
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``Accept-Language`` is set to any of ``zh``, ``zh-CN``, ``zh-TW``, ``zh-HK``
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or .. Wikipedia's LC automatically returns the desired script in their
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web-page.
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- You can test the API here: https://reqbin.com/gesg2kvx
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.. _https://zh.wikipedia.org/wiki/出租車:
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https://zh.wikipedia.org/wiki/%E5%87%BA%E7%A7%9F%E8%BB%8A
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To support Wikipedia's LanguageConverter_, a SearXNG request to Wikipedia uses
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:py:obj:`get_wiki_params` and :py:obj:`wiki_lc_locale_variants' in the
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:py:obj:`fetch_wikimedia_traits` function.
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To test in SearXNG, query for ``!wp 出租車`` with each of the available Chinese
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options:
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- ``!wp 出租車 :zh`` should show 出租車
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- ``!wp 出租車 :zh-CN`` should show 出租车
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- ``!wp 出租車 :zh-TW`` should show 計程車
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- ``!wp 出租車 :zh-HK`` should show 的士
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- ``!wp 出租車 :zh-SG`` should show 德士
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.. _LanguageConverter:
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https://www.mediawiki.org/wiki/Writing_systems#LanguageConverter
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.. _Wikipedias in multiple writing systems:
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https://meta.wikimedia.org/wiki/Wikipedias_in_multiple_writing_systems
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.. _Automatic conversion between traditional and simplified Chinese characters:
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https://en.wikipedia.org/wiki/Chinese_Wikipedia#Automatic_conversion_between_traditional_and_simplified_Chinese_characters
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.. _PR-2554: https://github.com/searx/searx/pull/2554
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"""
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import urllib.parse
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import babel
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from lxml import html
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from searx import utils
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from searx import network as _network
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from searx import locales
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from searx.enginelib.traits import EngineTraits
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traits: EngineTraits
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# about
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about = {
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"website": 'https://www.wikipedia.org/',
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"wikidata_id": 'Q52',
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"official_api_documentation": 'https://en.wikipedia.org/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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display_type = ["infobox"]
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"""A list of display types composed from ``infobox`` and ``list``. The latter
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one will add a hit to the result list. The first one will show a hit in the
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info box. Both values can be set, or one of the two can be set."""
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send_accept_language_header = True
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"""The HTTP ``Accept-Language`` header is needed for wikis where
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LanguageConverter_ is enabled."""
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list_of_wikipedias = 'https://meta.wikimedia.org/wiki/List_of_Wikipedias'
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"""`List of all wikipedias <https://meta.wikimedia.org/wiki/List_of_Wikipedias>`_
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"""
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wikipedia_article_depth = 'https://meta.wikimedia.org/wiki/Wikipedia_article_depth'
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"""The *editing depth* of Wikipedia is one of several possible rough indicators
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of the encyclopedia's collaborative quality, showing how frequently its articles
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are updated. The measurement of depth was introduced after some limitations of
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the classic measurement of article count were realized.
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"""
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rest_v1_summary_url = 'https://{wiki_netloc}/api/rest_v1/page/summary/{title}'
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"""
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`wikipedia rest_v1 summary API`_:
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The summary response includes an extract of the first paragraph of the page in
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plain text and HTML as well as the type of page. This is useful for page
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previews (fka. Hovercards, aka. Popups) on the web and link previews in the
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apps.
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HTTP ``Accept-Language`` header (:py:obj:`send_accept_language_header`):
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The desired language variant code for wikis where LanguageConverter_ is
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enabled.
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.. _wikipedia rest_v1 summary API:
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https://en.wikipedia.org/api/rest_v1/#/Page%20content/get_page_summary__title_
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"""
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wiki_lc_locale_variants = {
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"zh": (
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"zh-CN",
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"zh-HK",
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"zh-MO",
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"zh-MY",
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"zh-SG",
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"zh-TW",
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),
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"zh-classical": ("zh-classical",),
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}
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"""Mapping rule of the LanguageConverter_ to map a language and its variants to
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a Locale (used in the HTTP ``Accept-Language`` header). For example see `LC
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Chinese`_.
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.. _LC Chinese:
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https://meta.wikimedia.org/wiki/Wikipedias_in_multiple_writing_systems#Chinese
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"""
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wikipedia_script_variants = {
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"zh": (
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"zh_Hant",
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"zh_Hans",
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)
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}
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def get_wiki_params(sxng_locale, eng_traits):
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"""Returns the Wikipedia language tag and the netloc that fits to the
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``sxng_locale``. To support LanguageConverter_ this function rates a locale
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(region) higher than a language (compare :py:obj:`wiki_lc_locale_variants`).
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"""
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eng_tag = eng_traits.get_region(sxng_locale, eng_traits.get_language(sxng_locale, 'en'))
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wiki_netloc = eng_traits.custom['wiki_netloc'].get(eng_tag, 'en.wikipedia.org')
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return eng_tag, wiki_netloc
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def request(query, params):
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"""Assemble a request (`wikipedia rest_v1 summary API`_)."""
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if query.islower():
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query = query.title()
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_eng_tag, wiki_netloc = get_wiki_params(params['searxng_locale'], traits)
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title = urllib.parse.quote(query)
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params['url'] = rest_v1_summary_url.format(wiki_netloc=wiki_netloc, title=title)
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params['raise_for_httperror'] = False
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params['soft_max_redirects'] = 2
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return params
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# get response from search-request
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def response(resp):
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results = []
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if resp.status_code == 404:
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return []
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if resp.status_code == 400:
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try:
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api_result = resp.json()
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except Exception: # pylint: disable=broad-except
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pass
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else:
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if (
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api_result['type'] == 'https://mediawiki.org/wiki/HyperSwitch/errors/bad_request'
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and api_result['detail'] == 'title-invalid-characters'
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):
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return []
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_network.raise_for_httperror(resp)
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api_result = resp.json()
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title = utils.html_to_text(api_result.get('titles', {}).get('display') or api_result.get('title'))
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wikipedia_link = api_result['content_urls']['desktop']['page']
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if "list" in display_type or api_result.get('type') != 'standard':
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# show item in the result list if 'list' is in the display options or it
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# is a item that can't be displayed in a infobox.
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results.append({'url': wikipedia_link, 'title': title, 'content': api_result.get('description', '')})
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if "infobox" in display_type:
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if api_result.get('type') == 'standard':
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results.append(
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{
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'infobox': title,
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'id': wikipedia_link,
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'content': api_result.get('extract', ''),
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'img_src': api_result.get('thumbnail', {}).get('source'),
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'urls': [{'title': 'Wikipedia', 'url': wikipedia_link}],
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}
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)
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return results
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# Nonstandard language codes
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#
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# These Wikipedias use language codes that do not conform to the ISO 639
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# standard (which is how wiki subdomains are chosen nowadays).
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lang_map = locales.LOCALE_BEST_MATCH.copy()
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lang_map.update(
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{
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'be-tarask': 'bel',
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'ak': 'aka',
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'als': 'gsw',
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'bat-smg': 'sgs',
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'cbk-zam': 'cbk',
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'fiu-vro': 'vro',
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'map-bms': 'map',
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'no': 'nb-NO',
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'nrm': 'nrf',
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'roa-rup': 'rup',
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'nds-nl': 'nds',
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#'simple: – invented code used for the Simple English Wikipedia (not the official IETF code en-simple)
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'zh-min-nan': 'nan',
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'zh-yue': 'yue',
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'an': 'arg',
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}
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)
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def fetch_traits(engine_traits: EngineTraits):
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fetch_wikimedia_traits(engine_traits)
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print("WIKIPEDIA_LANGUAGES: %s" % len(engine_traits.custom['WIKIPEDIA_LANGUAGES']))
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def fetch_wikimedia_traits(engine_traits: EngineTraits):
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"""Fetch languages from Wikipedia. Not all languages from the
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:py:obj:`list_of_wikipedias` are supported by SearXNG locales, only those
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known from :py:obj:`searx.locales.LOCALE_NAMES` or those with a minimal
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:py:obj:`editing depth <wikipedia_article_depth>`.
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The location of the Wikipedia address of a language is mapped in a
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:py:obj:`custom field <searx.enginelib.traits.EngineTraits.custom>`
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(``wiki_netloc``). Here is a reduced example:
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.. code:: python
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traits.custom['wiki_netloc'] = {
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"en": "en.wikipedia.org",
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..
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"gsw": "als.wikipedia.org",
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..
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"zh": "zh.wikipedia.org",
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"zh-classical": "zh-classical.wikipedia.org"
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}
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"""
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# pylint: disable=too-many-branches
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engine_traits.custom['wiki_netloc'] = {}
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engine_traits.custom['WIKIPEDIA_LANGUAGES'] = []
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# insert alias to map from a script or region to a wikipedia variant
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for eng_tag, sxng_tag_list in wikipedia_script_variants.items():
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for sxng_tag in sxng_tag_list:
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engine_traits.languages[sxng_tag] = eng_tag
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for eng_tag, sxng_tag_list in wiki_lc_locale_variants.items():
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for sxng_tag in sxng_tag_list:
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engine_traits.regions[sxng_tag] = eng_tag
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resp = _network.get(list_of_wikipedias)
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if not resp.ok:
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print("ERROR: response from Wikipedia is not OK.")
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dom = html.fromstring(resp.text)
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for row in dom.xpath('//table[contains(@class,"sortable")]//tbody/tr'):
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cols = row.xpath('./td')
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if not cols:
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continue
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cols = [c.text_content().strip() for c in cols]
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depth = float(cols[11].replace('-', '0').replace(',', ''))
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articles = int(cols[4].replace(',', '').replace(',', ''))
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eng_tag = cols[3]
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wiki_url = row.xpath('./td[4]/a/@href')[0]
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wiki_url = urllib.parse.urlparse(wiki_url)
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try:
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sxng_tag = locales.language_tag(babel.Locale.parse(lang_map.get(eng_tag, eng_tag), sep='-'))
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except babel.UnknownLocaleError:
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# print("ERROR: %s [%s] is unknown by babel" % (cols[0], eng_tag))
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continue
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finally:
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engine_traits.custom['WIKIPEDIA_LANGUAGES'].append(eng_tag)
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if sxng_tag not in locales.LOCALE_NAMES:
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if articles < 10000:
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# exclude languages with too few articles
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continue
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if int(depth) < 20:
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# Rough indicator of a Wikipedia’s quality, showing how
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# frequently its articles are updated.
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continue
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conflict = engine_traits.languages.get(sxng_tag)
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if conflict:
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if conflict != eng_tag:
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print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, eng_tag))
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continue
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engine_traits.languages[sxng_tag] = eng_tag
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engine_traits.custom['wiki_netloc'][eng_tag] = wiki_url.netloc
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engine_traits.custom['WIKIPEDIA_LANGUAGES'].sort()
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