from urllib.parse import urlparse, parse_qsl from flask_babel import gettext import re 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']) return True