text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  """
      SleekXMPP: The Sleek XMPP Library
      Copyright (C) 2010  Nathanael C. Fritz,
                    2017  Mario Hock
      This file is part of SleekXMPP.
  
      See the file LICENSE for copying permission.
  """
  
  import sys
  import logging
  import getpass
  from optparse import OptionParser
  
  import sleekxmpp
  
  # Python versions before 3.0 do not use UTF-8 encoding
  # by default. To ensure that Unicode is handled properly
  # throughout SleekXMPP, we will set the default encoding
  # ourselves to UTF-8.
  if sys.version_info < (3, 0):
      from sleekxmpp.util.misc_ops import setdefaultencoding
      setdefaultencoding('utf8')
  else:
      raw_input = input
  
  
  class EchoBot(sleekxmpp.ClientXMPP):
  
      """
      A simple SleekXMPP bot that will echo messages it
      receives, along with a short thank you message.
      """
  
      def __init__(self, jid, password):
          sleekxmpp.ClientXMPP.__init__(self, jid, password)
  
          # The session_start event will be triggered when
          # the bot establishes its connection with the server
          # and the XML streams are ready for use. We want to
          # listen for this event so that we we can initialize
          # our roster.
          self.add_event_handler("session_start", self.start)
  
          # The message event is triggered whenever a message
          # stanza is received. Be aware that that includes
          # MUC messages and error messages.
          self.add_event_handler("message", self.message)
  
      def start(self, event):
          """
          Process the session_start event.
  
          Typical actions for the session_start event are
          requesting the roster and broadcasting an initial
          presence stanza.
  
          Arguments:
              event -- An empty dictionary. The session_start
                       event does not provide any additional
                       data.
          """
          self.send_presence()
          self.get_roster()
  
  
          print("Start MAM")
          ret = self["xep_0313"].get_preferences()
          print("Archiving default is: ", ret["mam_prefs"]["default"])
          # self["xep_0313"].set_preferences(default="always", block=True)
  
          # async non-blocking
          # answer = self["xep_0313"].retrieve(block=False, callback=self.__handle_mam_result)
  
          # blocking
          answer = self["xep_0313"].retrieve(block=True, callback=None,
                                             # start="2017-06-05T12:00:00+00:00",
                                             # end="2017-06-05T23:59:59+00:00",
                                             number_of_queried_elements=1,
                                             collect_all=True)
  
          # If no callback is used, the handler function is called here to
          # display the results.
          self.__handle_mam_result(answer)
  
          # Note that a blocking call will finish before this,
          #  an async call will finish after this.
          print("End MAM")
  
  
      def __handle_mam_result(self, response):
          print("Answer for query {}".format(response['mam_answer']['queryid']))
          print("  - answer is: {}".format("complete" if response["mam_answer"]["complete"] else "incomplete"))
          print("  - last message is: {}".format(response["mam_answer"]["rsm"]["last"]))
          
          result = response['mam_answer']['results']
  
          for x in result:
              msg = x["mam_result"]["forwarded"]["message"]
              delay = x["mam_result"]["forwarded"]["delay"]
              if msg["body"]:
                  print("==========")
                  print("From:", msg["from"])
                  print("Time:", delay["stamp"])
                  print("--------")
                  print(msg["body"])
                  print("--------")
                  print()
  
  
      def message(self, msg):
          """
          Process incoming message stanzas. Be aware that this also
          includes MUC messages and error messages. It is usually
          a good idea to check the messages's type before processing
          or sending replies.
  
          Arguments:
              msg -- The received message stanza. See the documentation
                     for stanza objects and the Message stanza to see
                     how it may be used.
          """
          if msg['type'] in ('chat', 'normal'):
              msg.reply("Thanks for sending\n%(body)s" % msg).send()
  
  
  if __name__ == '__main__':
      # Setup the command line arguments.
      optp = OptionParser()
  
      # Output verbosity options.
      optp.add_option('-q', '--quiet', help='set logging to ERROR',
                      action='store_const', dest='loglevel',
                      const=logging.ERROR, default=logging.INFO)
      optp.add_option('-d', '--debug', help='set logging to DEBUG',
                      action='store_const', dest='loglevel',
                      const=logging.DEBUG, default=logging.INFO)
      optp.add_option('-v', '--verbose', help='set logging to COMM',
                      action='store_const', dest='loglevel',
                      const=5, default=logging.INFO)
  
      # JID and password options.
      optp.add_option("-j", "--jid", dest="jid",
                      help="JID to use")
      optp.add_option("-p", "--password", dest="password",
                      help="password to use")
  
      opts, args = optp.parse_args()
  
      # Setup logging.
      logging.basicConfig(level=opts.loglevel,
                          format='%(levelname)-8s %(message)s')
  
      if opts.jid is None:
          opts.jid = raw_input("Username: ")
      if opts.password is None:
          opts.password = getpass.getpass("Password: ")
  
      # Setup the EchoBot and register plugins. Note that while plugins may
      # have interdependencies, the order in which you register them does
      # not matter.
      xmpp = EchoBot(opts.jid, opts.password)
      xmpp.register_plugin('xep_0199')  # XMPP Ping
      xmpp.register_plugin("xep_0313")  # MAM
      xmpp.register_plugin("xep_0004")  # Data Form (required by xep_0313)
  
      # If you are connecting to Facebook and wish to use the
      # X-FACEBOOK-PLATFORM authentication mechanism, you will need
      # your API key and an access token. Then you'll set:
      # xmpp.credentials['api_key'] = 'THE_API_KEY'
      # xmpp.credentials['access_token'] = 'THE_ACCESS_TOKEN'
  
      # If you are connecting to MSN, then you will need an
      # access token, and it does not matter what JID you
      # specify other than that the domain is 'messenger.live.com',
      # so '_@messenger.live.com' will work. You can specify
      # the access token as so:
      # xmpp.credentials['access_token'] = 'THE_ACCESS_TOKEN'
  
      # If you are working with an OpenFire server, you may need
      # to adjust the SSL version used:
      # xmpp.ssl_version = ssl.PROTOCOL_SSLv3
  
      # If you want to verify the SSL certificates offered by a server:
      # xmpp.ca_certs = "path/to/ca/cert"
  
      # Connect to the XMPP server and start processing XMPP stanzas.
      if xmpp.connect():
          # If you do not have the dnspython library installed, you will need
          # to manually specify the name of the server if it does not match
          # the one in the JID. For example, to use Google Talk you would
          # need to use:
          #
          # if xmpp.connect(('talk.google.com', 5222)):
          #     ...
          xmpp.process(block=True)
          print("Done")
      else:
          print("Unable to connect.")
  