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 http.client
  11 import html
  12
  13 # Defaults, may be overwritten by command line arguments.
  14 SERVER = "irc.freenode.net"
  15 PORT = 6667
  16 TIMEOUT = 240
  17 USERNAME = "plomlombot"
  18 NICKNAME = USERNAME
  19
  20
  21 class ExceptionForRestart(Exception):
  22     pass
  23
  24
  25 class IO:
  26
  27     def __init__(self, server, port, timeout):
  28         self.timeout = timeout
  29         self.socket = socket.socket()
  30         self.socket.connect((server, port))
  31         self.socket.setblocking(0)
  32         self.line_buffer = []
  33         self.rune_buffer = ""
  34         self.last_pong = time.time()
  35         self.servername = self.recv_line(send_ping=False).split(" ")[0][1:]
  36
  37     def _pingtest(self, send_ping=True):
  38         if self.last_pong + self.timeout < time.time():
  39             print("SERVER NOT ANSWERING")
  40             raise ExceptionForRestart
  41         if send_ping:
  42             self.send_line("PING " + self.servername)
  43
  44     def send_line(self, msg):
  45         msg = msg.replace("\r", " ")
  46         msg = msg.replace("\n", " ")
  47         if len(msg.encode("utf-8")) > 510:
  48             print("NOT SENT LINE TO SERVER (too long): " + msg)
  49         print("LINE TO SERVER: "
  50               + str(datetime.datetime.now()) + ": " + msg)
  51         msg = msg + "\r\n"
  52         msg_len = len(msg)
  53         total_sent_len = 0
  54         while total_sent_len < msg_len:
  55             sent_len = self.socket.send(bytes(msg[total_sent_len:], "UTF-8"))
  56             if sent_len == 0:
  57                 print("SOCKET CONNECTION BROKEN")
  58                 raise ExceptionForRestart
  59             total_sent_len += sent_len
  60
  61     def _recv_line_wrapped(self, send_ping=True):
  62         if len(self.line_buffer) > 0:
  63             return self.line_buffer.pop(0)
  64         while True:
  65             ready = select.select([self.socket], [], [], int(self.timeout / 2))
  66             if not ready[0]:
  67                 self._pingtest(send_ping)
  68                 return None
  69             self.last_pong = time.time()
  70             received_runes = self.socket.recv(1024).decode("UTF-8")
  71             if len(received_runes) == 0:
  72                 print("SOCKET CONNECTION BROKEN")
  73                 raise ExceptionForRestart
  74             self.rune_buffer += received_runes
  75             lines_split = str.split(self.rune_buffer, "\r\n")
  76             self.line_buffer += lines_split[:-1]
  77             self.rune_buffer = lines_split[-1]
  78             if len(self.line_buffer) > 0:
  79                 return self.line_buffer.pop(0)
  80
  81     def recv_line(self, send_ping=True):
  82         line = self._recv_line_wrapped(send_ping)
  83         if line:
  84             print("LINE FROM SERVER " + str(datetime.datetime.now()) + ": " +
  85                   line)
  86         return line
  87
  88
  89 def init_session(server, port, timeout, nickname, username, channel):
  90     print("CONNECTING TO " + server)
  91     io = IO(server, port, timeout)
  92     io.send_line("NICK " + nickname)
  93     io.send_line("USER " + username + " 0 * : ")
  94     io.send_line("JOIN " + channel)
  95     return io
  96
  97
  98 def lineparser_loop(io, nickname):
  99
 100     def act_on_privmsg(tokens):
 101
 102         def url_check(msg):
 103
 104             def notice(msg):
 105                 io.send_line("NOTICE " + target + " :" + msg)
 106
 107             matches = re.findall("(https?://[^\s>]+)", msg)
 108             for i in range(len(matches)):
 109                 url = matches[i]
 110                 request = urllib.request.Request(url, headers={
 111                     "User-Agent": "plomlombot"
 112                 })
 113                 try:
 114                     webpage = urllib.request.urlopen(request, timeout=15)
 115                 except (urllib.error.HTTPError, urllib.error.URLError,
 116                         UnicodeError, http.client.BadStatusLine) as error:
 117                     notice("TROUBLE FOLLOWING URL: " + str(error))
 118                     continue
 119                 charset = webpage.info().get_content_charset()
 120                 if not charset:
 121                     charset = "utf-8"
 122                 content_type = webpage.info().get_content_type()
 123                 if content_type not in ('text/html', 'text/xml',
 124                                         'application/xhtml+xml'):
 125                     notice("TROUBLE READING PAGE TITLE: bad content type "
 126                            + content_type)
 127                     continue
 128                 content = webpage.read().decode(charset)
 129                 title = str(content).split('<title>')[1].split('</title>')[0]
 130                 title = html.unescape(title)
 131                 notice("PAGE TITLE FOR URL: " + title)
 132
 133         sender = ""
 134         for rune in tokens[0]:
 135             if rune == "!":
 136                 break
 137             if rune != ":":
 138                 sender += rune
 139         receiver = ""
 140         for rune in tokens[2]:
 141             if rune == "!":
 142                 break
 143             if rune != ":":
 144                 receiver += rune
 145         target = sender
 146         if receiver != nickname:
 147             target = receiver
 148         msg = str.join(" ", tokens[3:])[1:]
 149         url_check(msg)
 150
 151     while True:
 152         line = io.recv_line()
 153         if not line:
 154             continue
 155         tokens = line.split(" ")
 156         if len(tokens) > 1:
 157             if tokens[1] == "PRIVMSG":
 158                 act_on_privmsg(tokens)
 159             if tokens[0] == "PING":
 160                 io.send_line("PONG " + tokens[1])
 161
 162
 163 def parse_command_line_arguments():
 164     parser = argparse.ArgumentParser()
 165     parser.add_argument("-s, --server", action="store", dest="server",
 166                         default=SERVER,
 167                         help="server or server net to connect to (default: "
 168                         + SERVER + ")")
 169     parser.add_argument("-p, --port", action="store", dest="port", type=int,
 170                         default=PORT, help="port to connect to (default : "
 171                         + str(PORT) + ")")
 172     parser.add_argument("-t, --timeout", action="store", dest="timeout",
 173                         type=int, default=TIMEOUT,
 174                         help="timeout in seconds after which to attempt " +
 175                         "reconnect (default: " + str(TIMEOUT) + ")")
 176     parser.add_argument("-u, --username", action="store", dest="username",
 177                         default=USERNAME, help="username to use (default: "
 178                         + USERNAME + ")")
 179     parser.add_argument("-n, --nickname", action="store", dest="nickname",
 180                         default=NICKNAME, help="nickname to use (default: "
 181                         + NICKNAME + ")")
 182     parser.add_argument("CHANNEL", action="store", help="channel to join")
 183     opts, unknown = parser.parse_known_args()
 184     return opts
 185
 186 opts = parse_command_line_arguments()
 187 while True:
 188     try:
 189         io = init_session(opts.server, opts.port, opts.timeout, opts.nickname,
 190                           opts.username, opts.CHANNEL)
 191         lineparser_loop(io, opts.nickname)
 192     except ExceptionForRestart:
 193         io.socket.close()
 194         continue