#!/usr/bin/env python

import sys
import os.path
import configparser
import http.client
import xml.etree.ElementTree as ET
import hmac

class cps_ups:
    def __init__(self, address, secret_key, port = 3052):
        self.address = address
        self.port = port
        self.secret_key = secret_key
        self.connection = http.client.HTTPConnection(self.address, self.port)
    def __get_keepalive_data__(self):
        self.connection.request("GET", "/keepalive.xml?ip=" + self.host_address + "&id=-1&type=1")
        for i in ET.fromstring(self.connection.getresponse().read()).iter("data"):
            keepalive_data=i.attrib
        self.connection.close()
        return(keepalive_data)
    def __genxml__(self, keepalive_data):
        data_tag = '<data ver="1.1"'\
            'hash="hmac-md5-128" '\
            'boot="' + keepalive_data['boot'] + \
            '" upt="' + keepalive_data['upt'] + \
            '" ip="' + self.host_address + \
            '" id="' + keepalive_data['id'] + \
            '" st="' + self.shutdown_time + \
            '" dt="' + self.delay_time + \
            '" bedt="' + self.bedt + \
            '" name="' + self.hostname + \
            '" loc="' + self.location + \
            '" cont="' + self.contact + \
            '" oid="' + self.outlet_id + \
            '" isps="' + self.isps + \
            '" bid="' + self.bank_id + \
            '" sa="' + self.sa + \
            '" event="' + self.event + \
            '"/>'
        digest = hmac.new(self.secret_key.encode(), msg = data_tag.encode('utf-8')).hexdigest().upper()
        xml = '<?xml version="1.0" ' \
            'encoding="UTF-8" ' \
            'standalone="yes"?>' \
            '<setup>' + data_tag + \
            '<auth code="' + digest + \
            '"/></setup>'
        return(xml)
    def register(self,
                 ip_address,
                 shutdown_time,
                 delay_time,
                 hostname,
                 outlet_id,
                 bank_id,
                 sa,
                 event,
                 isps = "true",
                 contact = "",
                 location = "",
                 bedt = "0", ):
        self.host_address = ip_address
        self.shutdown_time = shutdown_time
        self.delay_time = delay_time
        self.hostname = hostname
        self.outlet_id = outlet_id
        self.bank_id = bank_id
        self.isps = isps
        self.contact = contact
        self.location = location
        self.bedt = bedt
        self.sa = sa
        self.event = event
        try:
            post_data = self.__genxml__(self.__get_keepalive_data__())
            self.connection.request("POST", "/setup.xml", body = post_data)
        except (OSError, ConnectionError) as err:
            print('Unable to register: ' + str(err))
            sys.exit(3)
        response = self.connection.getresponse().read()
        self.connection.close()
        return(response)

def help():
    print('Usage: ' + sys.argv[0] + ' <path-to-configuration-file>')

configuration_structure = {'UPS': ['address',
                                   'secret_key',
                                   'port'],
                           'HOST': ['ip_address',
                                    'shutdown_time',
                                    'delay_time',
                                    'hostname',
                                    'outlet_id',
                                    'bank_id',
                                    'isps',
                                    'contact',
                                    'location',
                                    'bedt',
                                    'sa',
                                    'event']}
try:
    configfile = sys.argv[1]
except IndexError:
    help()
    sys.exit(1)
if not os.path.isfile(configfile):
    print('Error: configuration file ' + configfile + ' doesn\'t exists')
    sys.exit(2)
configuration = {}
try:
    config = configparser.ConfigParser()
    config.read(configfile)
    for section in configuration_structure:
        configuration[section] = {}
        for param in configuration_structure[section]:
            configuration[section][param] = config.get(section, param)
except (configparser.NoOptionError,
        configparser.MissingSectionHeaderError,
        configparser.ParsingError,
        configparser.NoSectionError) as err:
    print('Configuration file parsing error:\n' + str(err))
    sys.exit(3)

u = cps_ups(address = configuration['UPS']['address'],
            secret_key = configuration['UPS']['secret_key'],
            port = int(configuration['UPS']['port']))

u.register(ip_address = configuration['HOST']['ip_address'],
           shutdown_time = configuration['HOST']['shutdown_time'],
           delay_time = configuration['HOST']['delay_time'],
           hostname = configuration['HOST']['hostname'],
           outlet_id = configuration['HOST']['outlet_id'],
           bank_id = configuration['HOST']['bank_id'],
           isps = configuration['HOST']['isps'],
           contact = configuration['HOST']['contact'],
           location = configuration['HOST']['location'],
           bedt = configuration['HOST']['bedt'],
           sa = configuration['HOST']['sa'],
           event = configuration['HOST']['event'])