plomlombot.py

   1 import argparse
   2 import socket
   3 import datetime
   4 import select
   5 import time
   6 import re
   7 import urllib.request
   8 import html
   9
  10 # Defaults, may be overwritten by command line arguments.
  11 SERVER = "irc.freenode.net"
  12 PORT = 6667
  13 TIMEOUT = 240
  14 USERNAME = "plomlombot"
  15 NICKNAME = USERNAME
  16
  17 class ExceptionForRestart(Exception):
  18     pass
  19
  20 class IO:
  21
  22     def __init__(self, server, port, timeout):
  23         self.timeout = timeout
  24         self.socket = socket.socket()
  25         self.socket.connect((server, port))
  26         self.socket.setblocking(0)
  27         self.line_buffer = []
  28         self.rune_buffer = ""
  29         self.last_pong = time.time()
  30         self.servername = self.recv_line(send_ping=False).split(" ")[0][1:]
  31
  32     def _pingtest(self, send_ping=True):
  33         if self.last_pong + self.timeout < time.time():
  34             print("SERVER NOT ANSWERING")
  35             raise ExceptionForRestart
  36         if send_ping:
  37             self.send_line("PING " + self.servername)
  38
  39     def send_line(self, msg):
  40         msg = msg.replace("\r", " ")
  41         msg = msg.replace("\n", " ")
  42         if len(msg.encode("utf-8")) > 510:
  43             print("NOT SENT LINE TO SERVER (too long): " + msg)
  44         print("LINE TO SERVER: "
  45             + str(datetime.datetime.now()) + ": " + msg)
  46         msg = msg + "\r\n"
  47         msg_len = len(msg)
  48         total_sent_len = 0
  49         while total_sent_len < msg_len:
  50             sent_len = self.socket.send(bytes(msg[total_sent_len:], "UTF-8"))
  51             if sent_len == 0:
  52                 print("SOCKET CONNECTION BROKEN")
  53                 raise ExceptionForRestart
  54             total_sent_len += sent_len
  55
  56     def _recv_line_wrapped(self, send_ping=True):
  57         if len(self.line_buffer) > 0:
  58             return self.line_buffer.pop(0)
  59         while True:
  60             ready = select.select([self.socket], [], [], int(self.timeout / 2))
  61             if not ready[0]:
  62                 self._pingtest(send_ping)
  63                 return None
  64             self.last_pong = time.time()
  65             received_runes = self.socket.recv(1024).decode("UTF-8")
  66             if len(received_runes) == 0:
  67                 print("SOCKET CONNECTION BROKEN")
  68                 raise ExceptionForRestart
  69             self.rune_buffer += received_runes
  70             lines_split = str.split(self.rune_buffer, "\r\n")
  71             self.line_buffer += lines_split[:-1]
  72             self.rune_buffer = lines_split[-1]
  73             if len(self.line_buffer) > 0:
  74                 return self.line_buffer.pop(0)
  75
  76     def recv_line(self, send_ping=True):
  77         line = self._recv_line_wrapped(send_ping)
  78         if line:
  79             print("LINE FROM SERVER " + str(datetime.datetime.now()) + ": " +
  80             line)
  81         return line
  82
  83 def init_session(server, port, timeout, nickname, username, channel):
  84     print("CONNECTING TO " + server)
  85     io = IO(server, port, timeout)
  86     io.send_line("NICK " + nickname)
  87     io.send_line("USER " + username + " 0 * : ")
  88     io.send_line("JOIN " + channel)
  89     return io
  90
  91 def lineparser_loop(io, nickname):
  92
  93     def act_on_privmsg(tokens):
  94
  95         def url_check(msg):
  96             matches = re.findall("(https?://[^\s]+)", msg)
  97             for i in range(len(matches)):
  98                 url = matches[i]
  99                 try:
 100                     webpage = urllib.request.urlopen(url, timeout=15)
 101                 except urllib.error.HTTPError as error:
 102                     print("TROUBLE FOLLOWING URL: " + str(error))
 103                     continue
 104                 charset = webpage.info().get_content_charset()
 105                 if not charset:
 106                     charset="utf-8"
 107                 content_type = webpage.info().get_content_type()
 108                 if not content_type in ('text/html', 'text/xml',
 109                         'application/xhtml+xml'):
 110                     print("TROUBLE INTERPRETING URL: bad content type "
 111                             + content_type)
 112                     continue
 113                 content = webpage.read().decode(charset)
 114                 title = str(content).split('<title>')[1].split('</title>')[0]
 115                 title = html.unescape(title)
 116                 io.send_line("PRIVMSG " + target + " :page title for url: "
 117                     + title)
 118
 119         sender = ""
 120         for rune in tokens[0]:
 121             if rune == "!":
 122                 break
 123             if rune != ":":
 124                 sender += rune
 125         receiver = ""
 126         for rune in tokens[2]:
 127             if rune == "!":
 128                 break
 129             if rune != ":":
 130                 receiver += rune
 131         target = sender
 132         if receiver != nickname:
 133             target = receiver
 134         msg = str.join(" ", tokens[3:])[1:]
 135         url_check(msg)
 136
 137     while 1:
 138         line = io.recv_line()
 139         if not line:
 140             continue
 141         tokens = line.split(" ")
 142         if len(tokens) > 1:
 143             if tokens[1] == "PRIVMSG":
 144                 act_on_privmsg(tokens)
 145             if tokens[0] == "PING":
 146                 io.send_line("PONG " + tokens[1])
 147
 148 def parse_command_line_arguments():
 149     parser = argparse.ArgumentParser()
 150     parser.add_argument("-s, --server", action="store", dest="server",
 151             default=SERVER,
 152             help="server or server net to connect to (default: " + SERVER +
 153             ")")
 154     parser.add_argument("-p, --port", action="store", dest="port", type=int,
 155             default=PORT, help="port to connect to (default : " + str(PORT) +
 156             ")")
 157     parser.add_argument("-t, --timeout", action="store", dest="timeout",
 158             type=int, default=TIMEOUT,
 159             help="timeout in seconds after which to attempt reconnect " +
 160             "(default: " + str(TIMEOUT) + ")")
 161     parser.add_argument("-u, --username", action="store", dest="username",
 162             default=USERNAME, help="username to use (default: " + USERNAME +
 163             ")")
 164     parser.add_argument("-n, --nickname", action="store", dest="nickname",
 165             default=NICKNAME, help="nickname to use (default: " + NICKNAME +
 166             ")")
 167     parser.add_argument("CHANNEL", action="store", help="channel to join")
 168     opts, unknown = parser.parse_known_args()
 169     return opts
 170
 171 opts = parse_command_line_arguments()
 172 while 1:
 173     try:
 174         io = init_session(opts.server, opts.port, opts.timeout, opts.nickname,
 175                 opts.username, opts.CHANNEL)
 176         lineparser_loop(io, opts.nickname)
 177     except ExceptionForRestart:
 178         io.socket.close()
 179         continue