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url.py
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Thu, Dec 19, 11:48

url.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2013 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
""" Bibcheck plugin that checks for invalid urls """
import urlparse
import re
try:
import requests
HAS_REQUESTS = True
except ImportError:
print "Requests module not available, no redirect/broken url detection"
HAS_REQUESTS = False
from invenio.config import CFG_SITE_URL, CFG_SITE_SECURE_URL
DOMAIN_REGEXP = r"^[a-zA-Z0-9\-\.]+\.([a-z]{2}|com|edu|gov|info|net|org)\/"
def clean_url(url):
"""
Return a canonical url, and add a http protocol if the url lacks protocol
"""
# Does it start with with something that looks like a domain?
if re.match(DOMAIN_REGEXP, url):
url = "http://" + url
# Canonicalize
parsed = list(urlparse.urlsplit(url))
if parsed[1] == "": # Relative or invalid URL
return None
if parsed[0] not in ("http", "https", "ftp"): # No/invalid schema
parsed[0] = "http"
return urlparse.urlunsplit(parsed)
def check_record(record, fields):
"""
Checks that the specified field contains a correctly formatted url, if it
doesn't it tries to figure out the correct url (for example by adding
http:// at the beginning) and amends the record.
It also makes a HEAD request to the url to check for broken links, server
errors etc...
If it encounters a permanent redirection (301) it will amend the record with
the new url of the resource.
"""
for (position, url) in record.iterfields(fields):
url_cleaned = clean_url(url)
if url_cleaned is None:
record.set_invalid('Field %s: invalid URL' % position[0])
continue
if HAS_REQUESTS:
try:
if any(url in url_cleaned for url in [CFG_SITE_URL, CFG_SITE_SECURE_URL]):
continue
response = requests.head(url_cleaned, allow_redirects=False,
verify=False)
code = response.status_code
if code >= 400 and code < 600:
record.set_invalid('Server error: %s - %s' % (code, url_cleaned))
elif code == 301:
url_cleaned = response.headers['Location']
except (requests.exceptions.ConnectionError,
requests.exceptions.HTTPError,
requests.exceptions.Timeout,
requests.exceptions.TooManyRedirects,
requests.exceptions.InvalidSchema,
requests.exceptions.InvalidURL) as e:
# Problem with the request occurred
record.set_invalid('Server error: %s - %s' % (e, url_cleaned))
record.amend_field(position, url_cleaned)

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