from flask_babel import gettext import re from urlparse import urlparse, parse_qsl regex = re.compile(r'10\.\d{4,9}/[^\s]+') name = gettext('DOAI rewrite') description = gettext('Avoid paywalls by redirecting to open-access versions of publications when available') default_on = False 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 on_result(request, search, result): doi = extract_doi(result['parsed_url']) if doi and len(doi) < 50: for suffix in ('/', '.pdf', '/full', '/meta', '/abstract'): if doi.endswith(suffix): doi = doi[:-len(suffix)] result['url'] = 'http://doai.io/' + doi result['parsed_url'] = urlparse(ctx['result']['url']) return True