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#!/usr/bin/env python

"""
    SleekXMPP: The Sleek XMPP Library
    Copyright (C) 2010  Nathanael C. Fritz
    This file is part of SleekXMPP.

    See the file LICENSE for copying permission.
"""
from __future__ import absolute_import
from . basexmpp import BaseXMPP
from xml.etree import cElementTree as ET

from . xmlstream.xmlstream import XMLStream
from . xmlstream.xmlstream import RestartStream
from . xmlstream.matcher.xmlmask import MatchXMLMask
from . xmlstream.matcher.xpath import MatchXPath
from . xmlstream.matcher.many import MatchMany
from . xmlstream.handler.callback import Callback
from . xmlstream.stanzabase import StanzaBase
from . xmlstream import xmlstream as xmlstreammod
import time
import logging
import base64
import sys
import random
import copy
from . import plugins
from . import stanza
import hashlib
srvsupport = True
try:
        import dns.resolver
except ImportError:
        srvsupport = False


class ComponentXMPP(basexmpp, XMLStream):
        """SleekXMPP's client class.  Use only for good, not evil."""

        def __init__(self, jid, secret, host, port, plugin_config = {}, plugin_whitelist=[], use_jc_ns=False):
                if use_jc_ns:
                        default_ns = 'jabber:client'
                else:
                        default_ns = 'jabber:component:accept'
                BaseXMPP.__init__(self, default_ns)
                self.auto_authorize = None
                self.stream_header = "<stream:stream xmlns='jabber:component:accept' xmlns:stream='http://etherx.jabber.org/streams' to='%s'>" % jid
                self.stream_footer = "</stream:stream>"
                self.server_host = host
                self.server_port = port
                self.set_jid(jid)
                self.secret = secret
                self.is_component = True
                self.registerHandler(Callback('Handshake', MatchXPath('{jabber:component:accept}handshake'), self._handleHandshake))

        def incoming_filter(self, xmlobj):
                if xmlobj.tag.startswith('{jabber:client}'):
                        xmlobj.tag = xmlobj.tag.replace('jabber:client', self.default_ns)
                for sub in xmlobj:
                        self.incoming_filter(sub)
                return xmlobj

        def start_stream_handler(self, xml):
                sid = xml.get('id', '')
                handshake = ET.Element('{jabber:component:accept}handshake')
                if sys.version_info < (3,0):
                        handshake.text = hashlib.sha1("%s%s" % (sid, self.secret)).hexdigest().lower()
                else:
                        handshake.text = hashlib.sha1(bytes("%s%s" % (sid, self.secret), 'utf-8')).hexdigest().lower()
                self.sendXML(handshake)

        def _handleHandshake(self, xml):
                self.event("session_start")

        def connect(self):
                logging.debug("Connecting to %s:%s" % (self.server_host, self.server_port))
                return xmlstreammod.XMLStream.connect(self, self.server_host, self.server_port)