"""Handle telnet: links"""
# Copyright (C) 2000,2001  Bastian Kleineidam
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

import telnetlib, urlparse
from linkcheck import Config, error, i18n
from urllib import splituser, splithost, splitport, splitpasswd
from HostCheckingUrlData import HostCheckingUrlData
from UrlData import is_valid_port

class TelnetUrlData (HostCheckingUrlData):
    "Url link with telnet scheme"

    def buildUrl (self):
        HostCheckingUrlData.buildUrl(self)
        parts = urlparse.urlsplit(self.url)
        userinfo, self.host = splituser(parts[1])
        self.host, self.port = splitport(self.host)
        if self.port is not None:
            if not is_valid_port(self.port):
                raise error(i18n._("URL has invalid port number %s")\
                                      % self.port)
            self.port = int(self.port)
        else:
            self.port = 23
        if userinfo:
            self.user, self.password = splitpasswd(userinfo)
        else:
            self.user, self.password = self.getUserPassword()


    def checkConnection (self):
        HostCheckingUrlData.checkConnection(self)
        self.urlConnection = telnetlib.Telnet()
        self.urlConnection.set_debuglevel(Config.DebugLevel)
        self.urlConnection.open(self.host, self.port)
        if self.user:
            self.urlConnection.read_until("login: ", 10)
            self.urlConnection.write(self.user+"\n")
            if self.password:
                self.urlConnection.read_until("Password: ", 10)
                self.urlConnection.write(self.password+"\n")
                # XXX how to tell if we are logged in??
        self.urlConnection.write("exit\n")