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A link checker written in Python that can crawl a web site and identify broken links
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# -*- coding: utf-8 -*-
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see
# <http://www.gnu.org/licenses/>.
"""
Web link checker script by Gergely Polonkai.
"""
import sys
from bs4 import BeautifulSoup
import requests
import re
import urlparse
import pprint
pp = pprint.PrettyPrinter(indent=4)
def _is_internal(base_parts, link_parts):
return base_parts.scheme == link_parts.scheme \
and base_parts.netloc == link_parts.netloc
def _update_link(checked_links, base_parts, link, checked=False, initial=False):
was_checked = False
link_parts = urlparse.urlparse(link)
if link in checked_links:
was_checked = checked_links[link]['checked']
checked_links[link]['checked'] = checked_links[link]['checked'] \
or checked
if not initial:
checked_links[link]['count'] += 1
else:
checked_links[link] = {
'checked': checked,
'count': 0 if initial else 1,
'external': not _is_internal(base_parts, link_parts),
}
return was_checked
def main(*args):
# We will store the links already checked here
checked_links = {}
if len(args) < 1:
print("Usage: %s <url>" % sys.argv[0])
return 1
base_url = args[0]
base_parts = urlparse.urlparse(base_url)
_update_link(checked_links, base_parts, base_url, initial=True)
while len([x for x in checked_links \
if checked_links[x]['checked'] == False]) > 0:
current_link = [x for x in checked_links \
if checked_links[x]['checked'] == False][0]
current_parts = urlparse.urlparse(current_link)
print("Checking %s" % current_link)
_update_link(checked_links, base_parts, current_link, checked=True)
checked_links[current_link]['uncheckable'] = current_parts.scheme \
not in ('http', 'httus',)
if checked_links[current_link]['uncheckable']:
continue
response = requests.get(current_link, allow_redirects=False)
if response.ok:
checked_links[current_link]['broken'] = False
# If we are being redirected, add the redirect link to
# link_cache. We will check them later
if response.is_redirect:
_update_link(
checked_links,
base_parts,
response.headers['location'],
initial=True)
checked_links[current_link]['redirect'] = True
continue
else:
checked_links[current_link]['redirect'] = False
# Don’t crawl external pages
if checked_links[current_link]['external']:
continue
soup = BeautifulSoup(response.content)
for a in soup.find_all('a'):
link = urlparse.urljoin(base_url, a.get('href'))
link_parts = urlparse.urlparse(link)
_update_link(checked_links, base_parts, link)
else:
checked_links[current_link]['broken'] = True
pp.pprint(checked_links)
if __name__ == '__main__':
main(*sys.argv[1:])