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Here is a Python 2 script that generates the session ID needed to log in with the new launcher.

import urllib2 import sys import getpass import json

if len(sys.argv) != 3:

       username = raw_input('Username: ')
       password = getpass.getpass('Password: ')

else:

       username = sys.argv[1]
       password = sys.argv[2]

data = {

       "agent": {
               "name": "Minecraft",
               "version": 1
       },
       "username": username,
       "password": password

}

req = urllib2.Request(url='https://authserver.mojang.com/authenticate', data=json.dumps(data), headers={"Content-Type": "application/json"}) json = json.loads(urllib2.urlopen(req).read())

username = json['selectedProfile']['name'] access_token = json['accessToken'] profile_id = json['selectedProfile']['id']

session_param = 'token:%s:%s' % (access_token, profile_id)

print username print session_param

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