#!/usr/bin/python

# -*- coding: utf-8 -*-

import os

import pwd

import sys

import optparse

import urlparse

import requests

from getpass import getpass

from centos import CentOSUserCert

from centos import defaults

def download_cert(username, password, topurl=None, servercacert=None, uploadcacert=None):

    if not topurl:

        topurl = defaults.FAS_TOPURL

    if not servercacert:

        servercacert = defaults.SERVER_CA_CERT_FILE

    if not uploadcacert:

        uploadcacert = defaults.UPLOAD_CA_CERT_FILE

    splittopurl = urlparse.urlsplit(topurl)

    usercertpath = os.path.join(splittopurl.path, 'user/dogencert')

    params = {'user_name': username, 'password': password, 'login': 'Login'}

    userspliturl = urlparse.SplitResult(splittopurl.scheme,

                                        splittopurl.netloc,

                                        usercertpath,

                                        None,

                                        None)

    servercapath = os.path.join(splittopurl.path, 'ca/ca-cert.pem')

    servercaspliturl = urlparse.SplitResult(splittopurl.scheme,

                                            splittopurl.netloc,

                                            servercapath,

                                            None,

                                            None)

    userurl = urlparse.urlunsplit(userspliturl)

    servercaurl = urlparse.urlunsplit(servercaspliturl)

    with open(os.path.expanduser(defaults.USER_CERT_FILE), 'w') as usercertfile:

        r = requests.post(userurl, params=params)

        try:

            r.raise_for_status()

        except requests.exceptions.HTTPError as e:

            print("""Could not generate certificate!

Response Code: {0}

Message: {1}""".format(e.response.status_code, e.response.reason)).strip()

            sys.exit(1)

        response = r.text

        usercertfile.write(response)

    with open(os.path.expanduser(defaults.SERVER_CA_CERT_FILE), 'w') as servercacertfile:

        r = requests.get(servercaurl, params=params)

        try:

            r.raise_for_status()

        except requests.exceptions.HTTPError as e:

            print("""Could not download CA Certificate!

Response Code: {0}

Message: {1}""".format(e.response.status_code, e.response.reason)).strip()

            sys.exit(1)

        response = r.text

        servercacertfile.write(response)

    # for now upload-ca.cert is the same as the server-ca cert. let's link them here

    if os.path.exists(os.path.expanduser(defaults.UPLOAD_CA_CERT_FILE)):

        os.unlink(os.path.expanduser(defaults.UPLOAD_CA_CERT_FILE))

    os.symlink(os.path.expanduser(defaults.SERVER_CA_CERT_FILE),

               os.path.expanduser(defaults.UPLOAD_CA_CERT_FILE))

    os.chmod(os.path.expanduser(defaults.USER_CERT_FILE), 0o600)

def main(opts):

    if not opts.certfile:

        certfile = defaults.USER_CERT_FILE

    else:

        certfile = opts.certfile

    if opts.username and not opts.verifycert:

        username = opts.username

    else:

        try:

            cert = CentOSUserCert(certfile)

            username = cert.CN

        except IOError, e:

            if opts.verifycert:

                print "{0}: {1}".format(os.path.expanduser(certfile), e.strerror)

                exit(1)

            username = pwd.getpwuid(os.geteuid())[0]

    if opts.verifycert:

        if not cert.valid:

            print "Your certificate is not valid"

            sys.exit(1)

        else:

            print "Your certificate is valid"

            sys.exit(0)

    if opts.newcert:

        password = getpass('FAS Password: ')

        download_cert(username, password)

if __name__ == '__main__':

    parser = optparse.OptionParser(usage="%prog [OPTIONS] ")

    parser.add_option('-u', '--username', action='store', dest='username',

                      default=False, help="ACO Username.")

    parser.add_option('-n', '--new-cert', action='store_true', dest='newcert',

                      default=False, help="Generate a new User Certificate.")

    parser.add_option('-f', '--file', action='store', dest='certfile',

                      default=None, help="User Certificate.")

    parser.add_option('-v', '--verify-cert', action='store_true', dest='verifycert',

                      default=False, help="Verify Certificate.")

    opts, args = parser.parse_args()

    if not opts.newcert and not opts.verifycert:

        print "Must specify one of arguments: -v or -n"

        parser.print_help()

        sys.exit(1)

    main(opts)