plomlombot.py

   1 #!/usr/bin/python3
   2
   3 import argparse
   4 import socket
   5 import datetime
   6 import select
   7 import time
   8 import re
   9 import urllib.request
  10 import html
  11
  12 # Defaults, may be overwritten by command line arguments.
  13 SERVER = "irc.freenode.net"
  14 PORT = 6667
  15 TIMEOUT = 240
  16 USERNAME = "plomlombot"
  17 NICKNAME = USERNAME
  18
  19 class ExceptionForRestart(Exception):
  20     pass
  21
  22 class IO:
  23
  24     def __init__(self, server, port, timeout):
  25         self.timeout = timeout
  26         self.socket = socket.socket()
  27         self.socket.connect((server, port))
  28         self.socket.setblocking(0)
  29         self.line_buffer = []
  30         self.rune_buffer = ""
  31         self.last_pong = time.time()
  32         self.servername = self.recv_line(send_ping=False).split(" ")[0][1:]
  33
  34     def _pingtest(self, send_ping=True):
  35         if self.last_pong + self.timeout < time.time():
  36             print("SERVER NOT ANSWERING")
  37             raise ExceptionForRestart
  38         if send_ping:
  39             self.send_line("PING " + self.servername)
  40
  41     def send_line(self, msg):
  42         msg = msg.replace("\r", " ")
  43         msg = msg.replace("\n", " ")
  44         if len(msg.encode("utf-8")) > 510:
  45             print("NOT SENT LINE TO SERVER (too long): " + msg)
  46         print("LINE TO SERVER: "
  47             + str(datetime.datetime.now()) + ": " + msg)
  48         msg = msg + "\r\n"
  49         msg_len = len(msg)
  50         total_sent_len = 0
  51         while total_sent_len < msg_len:
  52             sent_len = self.socket.send(bytes(msg[total_sent_len:], "UTF-8"))
  53             if sent_len == 0:
  54                 print("SOCKET CONNECTION BROKEN")
  55                 raise ExceptionForRestart
  56             total_sent_len += sent_len
  57
  58     def _recv_line_wrapped(self, send_ping=True):
  59         if len(self.line_buffer) > 0:
  60             return self.line_buffer.pop(0)
  61         while True:
  62             ready = select.select([self.socket], [], [], int(self.timeout / 2))
  63             if not ready[0]:
  64                 self._pingtest(send_ping)
  65                 return None
  66             self.last_pong = time.time()
  67             received_runes = self.socket.recv(1024).decode("UTF-8")
  68             if len(received_runes) == 0:
  69                 print("SOCKET CONNECTION BROKEN")
  70                 raise ExceptionForRestart
  71             self.rune_buffer += received_runes
  72             lines_split = str.split(self.rune_buffer, "\r\n")
  73             self.line_buffer += lines_split[:-1]
  74             self.rune_buffer = lines_split[-1]
  75             if len(self.line_buffer) > 0:
  76                 return self.line_buffer.pop(0)
  77
  78     def recv_line(self, send_ping=True):
  79         line = self._recv_line_wrapped(send_ping)
  80         if line:
  81             print("LINE FROM SERVER " + str(datetime.datetime.now()) + ": " +
  82             line)
  83         return line
  84
  85 def init_session(server, port, timeout, nickname, username, channel):
  86     print("CONNECTING TO " + server)
  87     io = IO(server, port, timeout)
  88     io.send_line("NICK " + nickname)
  89     io.send_line("USER " + username + " 0 * : ")
  90     io.send_line("JOIN " + channel)
  91     return io
  92
  93 def lineparser_loop(io, nickname):
  94
  95     def act_on_privmsg(tokens):
  96
  97         def url_check(msg):
  98             matches = re.findall("(https?://[^\s]+)", msg)
  99             for i in range(len(matches)):
 100                 url = matches[i]
 101                 try:
 102                     webpage = urllib.request.urlopen(url, timeout=15)
 103                 except (urllib.error.HTTPError, urllib.error.URLError,
 104                         UnicodeError) as error:
 105                     print("TROUBLE FOLLOWING URL: " + str(error))
 106                     continue
 107                 charset = webpage.info().get_content_charset()
 108                 if not charset:
 109                     charset="utf-8"
 110                 content_type = webpage.info().get_content_type()
 111                 if not content_type in ('text/html', 'text/xml',
 112                         'application/xhtml+xml'):
 113                     print("TROUBLE INTERPRETING URL: bad content type "
 114                             + content_type)
 115                     continue
 116                 content = webpage.read().decode(charset)
 117                 title = str(content).split('<title>')[1].split('</title>')[0]
 118                 title = html.unescape(title)
 119                 io.send_line("PRIVMSG " + target + " :page title for url: "
 120                     + title)
 121
 122         sender = ""
 123         for rune in tokens[0]:
 124             if rune == "!":
 125                 break
 126             if rune != ":":
 127                 sender += rune
 128         receiver = ""
 129         for rune in tokens[2]:
 130             if rune == "!":
 131                 break
 132             if rune != ":":
 133                 receiver += rune
 134         target = sender
 135         if receiver != nickname:
 136             target = receiver
 137         msg = str.join(" ", tokens[3:])[1:]
 138         url_check(msg)
 139
 140     while 1:
 141         line = io.recv_line()
 142         if not line:
 143             continue
 144         tokens = line.split(" ")
 145         if len(tokens) > 1:
 146             if tokens[1] == "PRIVMSG":
 147                 act_on_privmsg(tokens)
 148             if tokens[0] == "PING":
 149                 io.send_line("PONG " + tokens[1])
 150
 151 def parse_command_line_arguments():
 152     parser = argparse.ArgumentParser()
 153     parser.add_argument("-s, --server", action="store", dest="server",
 154             default=SERVER,
 155             help="server or server net to connect to (default: " + SERVER +
 156             ")")
 157     parser.add_argument("-p, --port", action="store", dest="port", type=int,
 158             default=PORT, help="port to connect to (default : " + str(PORT) +
 159             ")")
 160     parser.add_argument("-t, --timeout", action="store", dest="timeout",
 161             type=int, default=TIMEOUT,
 162             help="timeout in seconds after which to attempt reconnect " +
 163             "(default: " + str(TIMEOUT) + ")")
 164     parser.add_argument("-u, --username", action="store", dest="username",
 165             default=USERNAME, help="username to use (default: " + USERNAME +
 166             ")")
 167     parser.add_argument("-n, --nickname", action="store", dest="nickname",
 168             default=NICKNAME, help="nickname to use (default: " + NICKNAME +
 169             ")")
 170     parser.add_argument("CHANNEL", action="store", help="channel to join")
 171     opts, unknown = parser.parse_known_args()
 172     return opts
 173
 174 opts = parse_command_line_arguments()
 175 while 1:
 176     try:
 177         io = init_session(opts.server, opts.port, opts.timeout, opts.nickname,
 178                 opts.username, opts.CHANNEL)
 179         lineparser_loop(io, opts.nickname)
 180     except ExceptionForRestart:
 181         io.socket.close()
 182         continue