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main.py
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main.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import pkgutil
import urlparse
import json
import logging
import urllib2
from argparse import ArgumentParser
import copy
__all__ = ['main']
gfwlist_url = 'https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt' # ban with gfw, you need proxy to access
def parse_args():
parser = ArgumentParser()
parser.add_argument('-i', '--input', dest='input',
help='path to gfwlist', metavar='GFWLIST')
parser.add_argument('-f', '--file', dest='output', required=True,
help='path to output pac', metavar='PAC')
parser.add_argument('-p', '--proxy', dest='proxy', required=True,
help='the proxy parameter in the pac file, for example,\
"SOCKS5 127.0.0.1:1080;"', metavar='PROXY')
parser.add_argument('--user-rule', dest='user_rule',
help='user rule file, which will be appended to gfwlist')
return parser.parse_args()
def decode_gfwlist(content):
# decode base64 if have to
try:
if '.' in content:
raise
return content.decode('base64')
except:
return content
def get_hostname(something):
try:
# quite enough for GFW
if not something.startswith('http:'):
something = 'http://' + something
r = urlparse.urlparse(something)
return r.hostname
except Exception as e:
logging.error(e)
return None
def add_domain_to_set(s, something):
hostname = get_hostname(something)
if hostname is not None:
if hostname.startswith('.'):
hostname = hostname.lstrip('.')
if hostname.endswith('/'):
hostname = hostname.rstrip('/')
if hostname:
s.add(hostname)
def parse_gfwlist(content, user_rule=None):
builtin_rules = pkgutil.get_data('gfwlist2pac', 'resources/builtin.txt').splitlines(False)
gfwlist = content.splitlines(False)
if user_rule:
gfwlist.extend(user_rule.splitlines(False))
domains = set(builtin_rules)
for line in gfwlist:
if line.find('.*') >= 0:
continue
elif line.find('*') >= 0:
line = line.replace('*', '/')
if line.startswith('!'):
continue
elif line.startswith('['):
continue
elif line.startswith('@'):
# ignore white list
continue
elif line.startswith('||'):
add_domain_to_set(domains, line.lstrip('||'))
elif line.startswith('|'):
add_domain_to_set(domains, line.lstrip('|'))
elif line.startswith('.'):
add_domain_to_set(domains, line.lstrip('.'))
else:
add_domain_to_set(domains, line)
return domains
def reduce_domains(domains):
# reduce 'www.google.com' to 'google.com'
# remove invalid domains
tld_content = pkgutil.get_data('gfwlist2pac', 'resources/tld.txt')
tlds = set(tld_content.splitlines(False))
cus_content = pkgutil.get_data('gfwlist2pac', 'resources/custom.txt')
cuss = cus_content.splitlines(False)
ban_content = pkgutil.get_data('gfwlist2pac', 'resources/ban.txt')
bans = set(ban_content.splitlines(False))
new_domains = set()
for cus in cuss:
new_domains.add(cus)
for domain in domains:
domain_parts = domain.split('.')
last_root_domain = None
for i in xrange(0, len(domain_parts)):
root_domain = '.'.join(domain_parts[len(domain_parts) - i - 1:])
if i == 0:
if not tlds.__contains__(root_domain):
# root_domain is not a valid tld
break
last_root_domain = root_domain
if tlds.__contains__(root_domain):
continue
else:
break
if last_root_domain is not None \
and last_root_domain not in bans \
and last_root_domain not in new_domains:
same = False
for cus in new_domains:
if len(cus) < len(last_root_domain):
if cmp(cus[::-1] + '.', last_root_domain[::-1][0:len(cus)+1]) == 0 :
same = True
break
elif len(cus) > len(last_root_domain):
if cmp(last_root_domain[::-1] + '.', cus[::-1][0:len(last_root_domain)+1]) == 0 :
new_domains.remove(cus)
break
if not same :
new_domains.add(last_root_domain)
return new_domains
def generate_pac(domains, proxy):
# render the pac file
proxy_content = pkgutil.get_data('gfwlist2pac', 'resources/proxy.pac')
domains_dict = {}
for domain in domains:
domains_dict[domain] = 1
proxy_content = proxy_content.replace('__PROXY__', json.dumps(str(proxy)))
proxy_content = proxy_content.replace('__DOMAINS__', json.dumps(domains_dict, indent=2))
return proxy_content
def main():
args = parse_args()
user_rule = None
if (args.input):
with open(args.input, 'r') as f:
content = f.read()
else:
print 'Downloading gfwlist from %s' % gfwlist_url
content = urllib2.urlopen(gfwlist_url, timeout=10).read()
with open('gfwlist.txt', 'w') as f:
f.write(content)
if args.user_rule:
userrule_parts = urlparse.urlsplit(args.user_rule)
if not userrule_parts.scheme or not userrule_parts.netloc:
# It's not an URL, deal it as local file
with open(args.user_rule, 'rb') as f:
user_rule = f.read()
else:
# Yeah, it's an URL, try to download it
print 'Downloading user rules file from %s' % args.user_rule
user_rule = urllib2.urlopen(args.user_rule, timeout=10).read()
content = decode_gfwlist(content)
domains = parse_gfwlist(content, user_rule)
domains = reduce_domains(domains)
pac_content = generate_pac(domains, args.proxy)
with open(args.output, 'w') as f:
f.write(pac_content)
if __name__ == '__main__':
main()