#! /usr/bin/env python
import sys, getopt, boto.iam

def usage():
    print 'find_user_by_access_key.py -k <access_key>'
    sys.exit(1)

def main(argv):
    target_access_key = None
    try:
        opts, args = getopt.getopt(argv, 'k:', 'access-key=')
        for opt, arg in opts:
            if opt in ('-k', '--access-key'):
                target_access_key = arg
    except getopt.GetoptError:
        usage()

    if target_access_key is None:
        usage()

    user = find_user_by_access_key(target_access_key)
    if user is None:
        print 'None found'
    else:
        print user.user_name

def iam():
    return boto.connect_iam()

def users():
    return iam().get_all_users('/')['list_users_response']['list_users_result']['users']

def find_user_by_access_key(target_access_key):
    for user in users():
        for key_result in iam().get_all_access_keys(user['user_name'])['list_access_keys_response']['list_access_keys_result']['access_key_metadata']:
            user_access_key = key_result['access_key_id']
            if user_access_key == target_access_key:
                return user
    return None

if __name__ == '__main__':
    main(sys.argv[1:])