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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, ctx):
doi = extract_doi(ctx['result']['parsed_url'])
if doi and len(doi) < 50:
for suffix in ('/', '.pdf', '/full', '/meta', '/abstract'):
if doi.endswith(suffix):
doi = doi[:-len(suffix)]
ctx['result']['url'] = 'http://doai.io/' + doi
ctx['result']['parsed_url'] = urlparse(ctx['result']['url'])
return True
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