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