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 import html.parser
  13
  14 # Defaults, may be overwritten by command line arguments.
  15 SERVER = "irc.freenode.net"
  16 PORT = 6667
  17 TIMEOUT = 240
  18 USERNAME = "plomlombot"
  19 NICKNAME = USERNAME
  20
  21
  22 class HTMLParser(html.parser.HTMLParser):
  23     def __init__(self, html, tag):
  24         super().__init__()
  25         self._tag = ""
  26         self.data = ""
  27         self.feed(html)
  28     def handle_starttag(self, tag, attrs):
  29         if self.data == "":
  30             self._tag = tag
  31     def handle_endtag(self, tag):
  32         self._tag = ""
  33     def handle_data(self, data):
  34         if self._tag != "":
  35             self.data = data
  36
  37
  38 class ExceptionForRestart(Exception):
  39     pass
  40
  41
  42 class IO:
  43
  44     def __init__(self, server, port, timeout):
  45         self.timeout = timeout
  46         self.socket = socket.socket()
  47         self.socket.connect((server, port))
  48         self.socket.setblocking(0)
  49         self.line_buffer = []
  50         self.rune_buffer = ""
  51         self.last_pong = time.time()
  52         self.servername = self.recv_line(send_ping=False).split(" ")[0][1:]
  53
  54     def _pingtest(self, send_ping=True):
  55         if self.last_pong + self.timeout < time.time():
  56             print("SERVER NOT ANSWERING")
  57             raise ExceptionForRestart
  58         if send_ping:
  59             self.send_line("PING " + self.servername)
  60
  61     def send_line(self, msg):
  62         msg = msg.replace("\r", " ")
  63         msg = msg.replace("\n", " ")
  64         if len(msg.encode("utf-8")) > 510:
  65             print("NOT SENT LINE TO SERVER (too long): " + msg)
  66         print("LINE TO SERVER: "
  67               + str(datetime.datetime.now()) + ": " + msg)
  68         msg = msg + "\r\n"
  69         msg_len = len(msg)
  70         total_sent_len = 0
  71         while total_sent_len < msg_len:
  72             sent_len = self.socket.send(bytes(msg[total_sent_len:], "UTF-8"))
  73             if sent_len == 0:
  74                 print("SOCKET CONNECTION BROKEN")
  75                 raise ExceptionForRestart
  76             total_sent_len += sent_len
  77
  78     def _recv_line_wrapped(self, send_ping=True):
  79         if len(self.line_buffer) > 0:
  80             return self.line_buffer.pop(0)
  81         while True:
  82             ready = select.select([self.socket], [], [], int(self.timeout / 2))
  83             if not ready[0]:
  84                 self._pingtest(send_ping)
  85                 return None
  86             self.last_pong = time.time()
  87             received_bytes = self.socket.recv(1024)
  88             try:
  89                 received_runes = received_bytes.decode("UTF-8")
  90             except UnicodeDecodeError:
  91                 received_runes = received_bytes.decode("latin1")
  92             if len(received_runes) == 0:
  93                 print("SOCKET CONNECTION BROKEN")
  94                 raise ExceptionForRestart
  95             self.rune_buffer += received_runes
  96             lines_split = str.split(self.rune_buffer, "\r\n")
  97             self.line_buffer += lines_split[:-1]
  98             self.rune_buffer = lines_split[-1]
  99             if len(self.line_buffer) > 0:
 100                 return self.line_buffer.pop(0)
 101
 102     def recv_line(self, send_ping=True):
 103         line = self._recv_line_wrapped(send_ping)
 104         if line:
 105             print("LINE FROM SERVER " + str(datetime.datetime.now()) + ": " +
 106                   line)
 107         return line
 108
 109
 110 def init_session(server, port, timeout, nickname, username, channel):
 111     print("CONNECTING TO " + server)
 112     io = IO(server, port, timeout)
 113     io.send_line("NICK " + nickname)
 114     io.send_line("USER " + username + " 0 * : ")
 115     io.send_line("JOIN " + channel)
 116     return io
 117
 118
 119 def lineparser_loop(io, nickname):
 120
 121     def act_on_privmsg(tokens):
 122
 123         def url_check(msg):
 124
 125             def notice(msg):
 126                 io.send_line("NOTICE " + target + " :" + msg)
 127
 128             matches = re.findall("(https?://[^\s>]+)", msg)
 129             for i in range(len(matches)):
 130                 url = matches[i]
 131                 request = urllib.request.Request(url, headers={
 132                     "User-Agent": "plomlombot"
 133                 })
 134                 try:
 135                     webpage = urllib.request.urlopen(request, timeout=15)
 136                 except (urllib.error.HTTPError, urllib.error.URLError,
 137                         UnicodeError, http.client.BadStatusLine) as error:
 138                     notice("TROUBLE FOLLOWING URL: " + str(error))
 139                     continue
 140                 charset = webpage.info().get_content_charset()
 141                 if not charset:
 142                     notice("TROUBLE READING PAGE TITLE: no charset in header")
 143                     continue
 144                 content_type = webpage.info().get_content_type()
 145                 if content_type not in ('text/html', 'text/xml',
 146                                         'application/xhtml+xml'):
 147                     notice("TROUBLE READING PAGE TITLE: bad content type "
 148                            + content_type)
 149                     continue
 150                 content = webpage.read().decode(charset)
 151                 title = HTMLParser(content, "title").data
 152                 title = html.unescape(title)
 153                 notice("PAGE TITLE FOR URL: " + title)
 154
 155         sender = ""
 156         for rune in tokens[0]:
 157             if rune == "!":
 158                 break
 159             if rune != ":":
 160                 sender += rune
 161         receiver = ""
 162         for rune in tokens[2]:
 163             if rune == "!":
 164                 break
 165             if rune != ":":
 166                 receiver += rune
 167         target = sender
 168         if receiver != nickname:
 169             target = receiver
 170         msg = str.join(" ", tokens[3:])[1:]
 171         url_check(msg)
 172
 173     while True:
 174         line = io.recv_line()
 175         if not line:
 176             continue
 177         tokens = line.split(" ")
 178         if len(tokens) > 1:
 179             if tokens[1] == "PRIVMSG":
 180                 act_on_privmsg(tokens)
 181             if tokens[0] == "PING":
 182                 io.send_line("PONG " + tokens[1])
 183
 184
 185 def parse_command_line_arguments():
 186     parser = argparse.ArgumentParser()
 187     parser.add_argument("-s, --server", action="store", dest="server",
 188                         default=SERVER,
 189                         help="server or server net to connect to (default: "
 190                         + SERVER + ")")
 191     parser.add_argument("-p, --port", action="store", dest="port", type=int,
 192                         default=PORT, help="port to connect to (default : "
 193                         + str(PORT) + ")")
 194     parser.add_argument("-t, --timeout", action="store", dest="timeout",
 195                         type=int, default=TIMEOUT,
 196                         help="timeout in seconds after which to attempt " +
 197                         "reconnect (default: " + str(TIMEOUT) + ")")
 198     parser.add_argument("-u, --username", action="store", dest="username",
 199                         default=USERNAME, help="username to use (default: "
 200                         + USERNAME + ")")
 201     parser.add_argument("-n, --nickname", action="store", dest="nickname",
 202                         default=NICKNAME, help="nickname to use (default: "
 203                         + NICKNAME + ")")
 204     parser.add_argument("CHANNEL", action="store", help="channel to join")
 205     opts, unknown = parser.parse_known_args()
 206     return opts
 207
 208 opts = parse_command_line_arguments()
 209 while True:
 210     try:
 211         io = init_session(opts.server, opts.port, opts.timeout, opts.nickname,
 212                           opts.username, opts.CHANNEL)
 213         lineparser_loop(io, opts.nickname)
 214     except ExceptionForRestart:
 215         io.socket.close()
 216         continue