#!/usr/bin/env python  
#coding=utf-8
#  
# Generate a list of dnsmasq rules with ipset for gfwlist
#  
# Copyright (C) 2014 http://www.shuyz.com   
# Ref https://code.google.com/p/autoproxy-gfwlist/wiki/Rules    
 
import urllib2 
import re
import os
import datetime
import base64

# the url of gfwlist
baseurl = 'https://raw.githubusercontent.com/gfwlist/gfwlist/master/gfwlist.txt'
# match comments/title/whitelist/ip address
comment_pattern = '^\!|\[|^@@|^\d+\.\d+\.\d+\.\d+'
domain_pattern = '([\w\-\_]+\.[\w\.\-\_]+)[\/\*]*' 
tmpfile = './gfwlisttmp'
# do not write to router internal flash directly
outfile = './gfwlist.conf'
 
fs =  file(outfile, 'w')
 
print 'fetching list...'
content = urllib2.urlopen(baseurl, timeout=15).read().decode('base64')

# write the decoded content to file then read line by line
tfs = open(tmpfile, 'w')
tfs.write(content)
tfs.close()
tfs = open(tmpfile, 'r')

print 'page content fetched, analysis...'

# remember all blocked domains, in case of duplicate records
domainlist = []

for line in tfs.readlines():	
	if re.findall(comment_pattern, line):
		print 'this is a comment line: ' + line
		#fs.write('#' + line)
	else:
		domain = re.findall(domain_pattern, line)
		if domain:
			try:
				found = domainlist.index(domain[0])
				print domain[0] + ' exists.'
			except ValueError:
				print 'saving ' + domain[0]
				domainlist.append(domain[0])
				fs.write('ipset=/.%s/vpn\n'%domain[0])
		else:
			print 'no valid domain in this line: ' + line
					
tfs.close()	
fs.close();
 
print 'done!'