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from flask_babel import gettext
import re
from searx.url_utils import urlparse, parse_qsl
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 = 'privacy'
doi_resolvers = settings['doi_resolvers']
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(args, preference_doi_resolver):
doi_resolvers = settings['doi_resolvers']
doi_resolver = args.get('doi_resolver', preference_doi_resolver)[0]
if doi_resolver not in doi_resolvers:
doi_resolvers = settings['default_doi_resolver']
return doi_resolver
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'] = get_doi_resolver(request.args, request.preferences.get_value('doi_resolver')) + doi
result['parsed_url'] = urlparse(result['url'])
return True
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