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Filename : cl-link-to-cln
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#!/usr/libexec/platform-python

import sys
import optparse
import json
import time
from pyexpat import ExpatError

sys.path.append("/usr/share/rhn/")

from up2date_client import rhnserver
from up2date_client import up2dateAuth
from up2date_client import up2dateErrors
from up2date_client import rhnreg


def print_error_and_exit(error):
    print(json.dumps({'result': error,
                      'timestamp': time.time()}))
    sys.exit(-1)


def main():
    parser = optparse.OptionParser()

    parser.add_option('-t', '--linking-token', dest='token', help='Token to link the server')
    parser.add_option('-s', '--linking-status', dest='status', action='store_true', help='Show if status linked or not')

    options, args = parser.parse_args()

    if options.token and options.status:
        print_error_and_exit("Invalid usage, --linking-status and --linking-token could not "
                             "be specified simultaneously")

    if not options.token and not options.status:
        print_error_and_exit("Invalid usage, --linking-status or --linking-token must be specified")

    system_id_xml = up2dateAuth.getSystemId()
    if not system_id_xml:
        print_error_and_exit('Unable to read system id, please ensure your server is registered in CLN')

    if options.token:
        link_server(system_id_xml, options.token)
        print(json.dumps({'result': 'success', 'timestamp': time.time()}))
    elif options.status:
        linked_info = get_linked_info(system_id_xml)
        print(json.dumps({'result': 'success', 'timestamp': time.time(),
                          'linked': linked_info['linked'],
                          'linkable': linked_info['linkable']}))
    else:
        print_error_and_exit('Invalid usage, only supported options are: --linking-status or --linking-token')


def link_server(system_id, token):
    s = rhnserver.RhnServer()
    try:
        s.up2date.link_server(system_id, token)
    except ExpatError as e:
        # CLN returns empty response when success
        if 'no element found' not in e.message:
            raise
    rhnreg.getAndWriteJWTTokenToFile(system_id)


def get_linked_info(system_id):
    s = rhnserver.RhnServer()
    return {'linked': s.up2date.is_server_linked(system_id),
            'linkable': s.up2date.is_server_linkable(system_id)}


if __name__ == "__main__":
    try:
        main()
    except up2dateErrors.UnknownMethodException as e:
        print_error_and_exit('CLN does not support method for linking server. %s \n'
                             'Contact CloudLinux support in case you need help: '
                             'https://cloudlinux.zendesk.com/' % str(e))
    except up2dateErrors.RhnServerException as e:
        print_error_and_exit('Server exception, reason: %s \n'
                             'Contact CloudLinux support in case you need help: '
                             'https://cloudlinux.zendesk.com/' % str(e))
    except Exception as e:
        print_error_and_exit('Failed with common exception: %s \n'
                             'Contact CloudLinux support in case you need help: '
                             'https://cloudlinux.zendesk.com/' % str(e))