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# Part of rabbitears See LICENSE for permissions
# Copyright (C) 2022 Matt Arnold
import socket
import sys
import irctokens
import time
import base64
def create_sasl_plain_auth(username, password):
# per KICL this is the valid way to do it
auth_string = f"{username}\x00{username}\x00{password}"
auth_bytes = auth_string.encode("utf-8")
base64_auth = base64.b64encode(auth_bytes).decode("utf-8")
return base64_auth
def decode_sasl_plain_auth(base64_auth):
"""
Decode a SASL PLAIN authentication string for verification.
Args:
base64_auth (str): Base64 encoded SASL PLAIN authentication string
Returns:
tuple: (authorization_identity, username, password)
"""
# Decode base64
auth_bytes = base64.b64decode(base64_auth)
auth_string = auth_bytes.decode("utf-8")
# Split on null bytes
parts = auth_string.split("\x00")
# Return the three components
return tuple(parts)
class IRCBadMessage(Exception):
pass
class IRCError(Exception):
pass
def printred(s):
t = f"\033[1;31m {s} \033[0m\n"
print(t)
def parsemsg(s):
"""Breaks a message from an IRC server into its prefix, command, and arguments."""
prefix = ""
trailing = []
if not s:
raise IRCBadMessage("Empty line.")
if s[0] == ":":
prefix, s = s[1:].split(" ", 1)
if s.find(" :") != -1:
s, trailing = s.split(" :", 1)
args = s.split()
args.append(trailing)
else:
args = s.split()
command = args.pop(0)
return prefix, command, args
LINEEND = "\r\n"
class IRCBot:
irc = None
def __init__(self, sock, config=None):
self.irc = sock
self.connected = False
self.config = config
def send_cmd(self, line):
"""Send an IRC Command, takes an IRC command string without the CRLF
Returns encoded msg on success raises IRCError on failure"""
if not self.connected:
raise IRCError("Not Connected")
encmsg = bytes(line.format() + LINEEND, "UTF-8")
printred(encmsg)
expected = len(encmsg)
if self.irc.send(encmsg) == expected:
return str(encmsg)
else:
raise IRCError("Unexpected Send Length")
def on_welcome(self, *args, **kwargs):
authmsg = irctokens.build("NICKSERV", ["SET", "autoreplay-lines", "0"])
self.send_cmd(authmsg)
joinmsg = irctokens.build("JOIN", [self.config["channel"]])
self.send_cmd(joinmsg)
def send_privmsg(self, dst, msg):
msg = irctokens.build("PRIVMSG", [dst, msg])
self.send_cmd(msg)
def send_quit(self, quitmsg):
msg = irctokens.build("QUIT", [quitmsg])
print(msg)
self.send_cmd(msg)
def send_action(self, action_msg, dst):
pass
def connect(self, server, port, channel, botnick, botnickpass):
if self.config is None:
self.config = {}
self.config["hostname"] = server
self.config["port"] = port
self.config["nick"] = botnick
self.config["channel"] = channel
self.config["nickpass"] = botnickpass
print("Connecting to: " + server)
self.irc.connect((self.config["hostname"], self.config["port"]))
self.connected = True
# perform SASL
caps_msg = irctokens.build("CAP", ["REQ", "sasl"])
printred(caps_msg)
self.send_cmd(caps_msg)
# Perform user registration
cap = irctokens.build("CAP", ["LS", "302"])
self.send_cmd(cap)
password_msg = irctokens.build("PASS", [self.config["nickpass"]])
printred(password_msg)
token = create_sasl_plain_auth(botnick, botnickpass)
usermsg = irctokens.build("USER", [botnick, "0", "*", "frog"])
auth = irctokens.build("AUTHENTICATE", ["PLAIN"])
self.send_cmd(auth)
# auth_st2 = irctokens.build("AUTHENTICATE", ["+"])
# self.send_cmd(auth_st2)
auth_st3 = irctokens.build("AUTHENTICATE", [token])
self.send_cmd(auth_st3)
cmd = irctokens.build("CAP", ["END"])
self.send_cmd(cmd)
print(usermsg)
# s#elf.send_cmd(password_msg)
nickmsg = irctokens.build("NICK", [botnick]).format()
print(nickmsg)
self.send_cmd(nickmsg)
self.send_cmd(usermsg)
def get_response(self):
# Get the response
resp = self.irc.recv(4096).decode("UTF-8")
msg = parsemsg(resp)
nwmsg = irctokens.tokenise(resp)
printred(nwmsg.command)
if nwmsg.command == "001":
self.on_welcome(nwmsg.params)
if nwmsg.command == "ERROR":
raise IRCError(str(nwmsg.params[0]))
if nwmsg.command == "PING":
print("Sending pong")
self.irc.send(bytes("PONG " + nwmsg.params[0] + LINEEND, "UTF-8"))
return msg
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