#!/usr/bin/env python
import os
import re
import urllib2
import subprocess

BUNDLE_URL="https://www.emulab.net/genica.bundle"

def get_bundle():
    u = urllib2.urlopen(BUNDLE_URL)
    upath = urllib2.urlparse.urlsplit(u.url)[2]
    bundle_fname = os.path.basename(upath)
    open(bundle_fname, 'w').write(u.read())
    print "Downloaded:", bundle_fname
    return bundle_fname

def get_CN(cert):
    p = subprocess.Popen(['openssl', 'x509', '-issuer'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    p.stdin.write(cert)
    m = re.search("(CN=)(.*)([\/ ])", p.stdout.readline())
    if m:
        return m.group(2)

def write_cert(cert):
    cn = get_CN(cert)
    if not cn: return
    fname = '%s.gid' % cn
    open(fname, 'w').write(cert)
    print "Wrote:", fname

def extract(fname):
    bundle = open(fname, 'r')
    in_cert = False
    cert = ""
    for line in bundle:
        if line.startswith("-----BEGIN CERTIFICATE-----"):
            in_cert = True
        elif line.startswith("-----END CERTIFICATE-----"):
            in_cert = False
            cert += line
            write_cert(cert)
            cert = ""

        if in_cert:
            cert += line

if __name__ == "__main__":
    bundle = get_bundle()
    extract(bundle)