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# SPDX-License-Identifier: AGPL-3.0-or-later
# pylint: disable=missing-module-docstring
import re
from urllib.parse import urlparse, parse_qsl
from flask_babel import gettext
from searx import settings
regex = re.compile(r'10\.\d{4,9}/[^\s]+')
name = gettext('Open Access DOI rewrite')
description = gettext('Avoid paywalls by redirecting to open-access versions of publications when available')
default_on = False
preference_section = 'general'
def extract_doi(url):
match = regex.search(url.path)
if match:
return match.group(0)
for _, v in parse_qsl(url.query):
match = regex.search(v)
if match:
return match.group(0)
return None
def get_doi_resolver(preferences):
doi_resolvers = settings['doi_resolvers']
selected_resolver = preferences.get_value('doi_resolver')[0]
if selected_resolver not in doi_resolvers:
selected_resolver = settings['default_doi_resolver']
return doi_resolvers[selected_resolver]
def on_result(request, _search, result):
if 'parsed_url' not in result:
return True
doi = extract_doi(result['parsed_url'])
if doi and len(doi) < 50:
for suffix in ('/', '.pdf', '.xml', '/full', '/meta', '/abstract'):
if doi.endswith(suffix):
doi = doi[: -len(suffix)]
result['url'] = get_doi_resolver(request.preferences) + doi
result['parsed_url'] = urlparse(result['url'])
if 'doi' not in result:
result['doi'] = doi
return True
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