Install pyCraft and copy start.py

requirements.txt

@@ -0,0 +1,11 @@
+certifi==2020.6.20
+cffi==1.14.2
+chardet==3.0.4
+cryptography==3.1
+idna==2.10
+pycparser==2.20
+pyCraft @ git+https://github.com/ammaraskar/pyCraft.git@cf93923acc2dcfbc076379b43842228d77aea188
+PyNBT==3.0.0
+requests==2.24.0
+six==1.15.0
+urllib3==1.25.10

start.py

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+#!/usr/bin/env python
+
+import getpass
+import sys
+import re
+from optparse import OptionParser
+
+from minecraft import authentication
+from minecraft.exceptions import YggdrasilError
+from minecraft.networking.connection import Connection
+from minecraft.networking.packets import Packet, clientbound, serverbound
+
+
+def get_options():
+    parser = OptionParser()
+
+    parser.add_option("-u", "--username", dest="username", default=None,
+                      help="username to log in with")
+
+    parser.add_option("-p", "--password", dest="password", default=None,
+                      help="password to log in with")
+
+    parser.add_option("-s", "--server", dest="server", default=None,
+                      help="server host or host:port "
+                           "(enclose IPv6 addresses in square brackets)")
+
+    parser.add_option("-o", "--offline", dest="offline", action="store_true",
+                      help="connect to a server in offline mode "
+                           "(no password required)")
+
+    parser.add_option("-d", "--dump-packets", dest="dump_packets",
+                      action="store_true",
+                      help="print sent and received packets to standard error")
+
+    parser.add_option("-v", "--dump-unknown-packets", dest="dump_unknown",
+                      action="store_true",
+                      help="include unknown packets in --dump-packets output")
+
+    (options, args) = parser.parse_args()
+
+    if not options.username:
+        options.username = input("Enter your username: ")
+
+    if not options.password and not options.offline:
+        options.password = getpass.getpass("Enter your password (leave "
+                                           "blank for offline mode): ")
+        options.offline = options.offline or (options.password == "")
+
+    if not options.server:
+        options.server = input("Enter server host or host:port "
+                               "(enclose IPv6 addresses in square brackets): ")
+    # Try to split out port and address
+    match = re.match(r"((?P<host>[^\[\]:]+)|\[(?P<addr>[^\[\]]+)\])"
+                     r"(:(?P<port>\d+))?$", options.server)
+    if match is None:
+        raise ValueError("Invalid server address: '%s'." % options.server)
+    options.address = match.group("host") or match.group("addr")
+    options.port = int(match.group("port") or 25565)
+
+    return options
+
+
+def main():
+    options = get_options()
+
+    if options.offline:
+        print("Connecting in offline mode...")
+        connection = Connection(
+            options.address, options.port, username=options.username)
+    else:
+        auth_token = authentication.AuthenticationToken()
+        try:
+            auth_token.authenticate(options.username, options.password)
+        except YggdrasilError as e:
+            print(e)
+            sys.exit()
+        print("Logged in as %s..." % auth_token.username)
+        connection = Connection(
+            options.address, options.port, auth_token=auth_token)
+
+    if options.dump_packets:
+        def print_incoming(packet):
+            if type(packet) is Packet:
+                # This is a direct instance of the base Packet type, meaning
+                # that it is a packet of unknown type, so we do not print it
+                # unless explicitly requested by the user.
+                if options.dump_unknown:
+                    print('--> [unknown packet] %s' % packet, file=sys.stderr)
+            else:
+                print('--> %s' % packet, file=sys.stderr)
+
+        def print_outgoing(packet):
+            print('<-- %s' % packet, file=sys.stderr)
+
+        connection.register_packet_listener(
+            print_incoming, Packet, early=True)
+        connection.register_packet_listener(
+            print_outgoing, Packet, outgoing=True)
+
+    def handle_join_game(join_game_packet):
+        print('Connected.')
+
+    connection.register_packet_listener(
+        handle_join_game, clientbound.play.JoinGamePacket)
+
+    def print_chat(chat_packet):
+        print("Message (%s): %s" % (
+            chat_packet.field_string('position'), chat_packet.json_data))
+
+    connection.register_packet_listener(
+        print_chat, clientbound.play.ChatMessagePacket)
+
+    connection.connect()
+
+    while True:
+        try:
+            text = input()
+            if text == "/respawn":
+                print("respawning...")
+                packet = serverbound.play.ClientStatusPacket()
+                packet.action_id = serverbound.play.ClientStatusPacket.RESPAWN
+                connection.write_packet(packet)
+            else:
+                packet = serverbound.play.ChatPacket()
+                packet.message = text
+                connection.write_packet(packet)
+        except KeyboardInterrupt:
+            print("Bye!")
+            sys.exit()
+
+
+if __name__ == "__main__":
+    main()