summaryrefslogtreecommitdiff
path: root/lib/rbot/ircbot.rb
blob: b2c7a88f91b4cef106066ed3946f831684e1bb67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
require 'thread'
require 'etc'
require 'fileutils'

$debug = false unless $debug
# print +message+ if debugging is enabled
def debug(message=nil)
  stamp = Time.now.strftime("%Y/%m/%d %H:%M:%S")
  print "D: [#{stamp}] #{message}\n" if($debug && message)
  #yield
end

# these first
require 'rbot/rbotconfig'
require 'rbot/config'
require 'rbot/utils'

require 'rbot/rfc2812'
require 'rbot/keywords'
require 'rbot/ircsocket'
require 'rbot/auth'
require 'rbot/timer'
require 'rbot/plugins'
require 'rbot/channel'
require 'rbot/message'
require 'rbot/language'
require 'rbot/dbhash'
require 'rbot/registry'
require 'rbot/httputil'

module Irc

# Main bot class, which manages the various components, receives messages,
# handles them or passes them to plugins, and contains core functionality.
class IrcBot
  # the bot's current nickname
  attr_reader :nick
  
  # the bot's IrcAuth data
  attr_reader :auth
  
  # the bot's BotConfig data
  attr_reader :config
  
  # the botclass for this bot (determines configdir among other things)
  attr_reader :botclass
  
  # used to perform actions periodically (saves configuration once per minute
  # by default)
  attr_reader :timer
  
  # bot's Language data
  attr_reader :lang

  # channel info for channels the bot is in
  attr_reader :channels

  # bot's irc socket
  attr_reader :socket

  # bot's object registry, plugins get an interface to this for persistant
  # storage (hash interface tied to a bdb file, plugins use Accessors to store
  # and restore objects in their own namespaces.)
  attr_reader :registry

  # bot's httputil help object, for fetching resources via http. Sets up
  # proxies etc as defined by the bot configuration/environment
  attr_reader :httputil

  # create a new IrcBot with botclass +botclass+
  def initialize(botclass, params = {})
    # BotConfig for the core bot
    BotConfig.register BotConfigStringValue.new('server.name',
      :default => "localhost", :requires_restart => true,
      :desc => "What server should the bot connect to?",
      :wizard => true)
    BotConfig.register BotConfigIntegerValue.new('server.port',
      :default => 6667, :type => :integer, :requires_restart => true,
      :desc => "What port should the bot connect to?", 
      :validate => Proc.new {|v| v > 0}, :wizard => true)
    BotConfig.register BotConfigStringValue.new('server.password',
      :default => false, :requires_restart => true,
      :desc => "Password for connecting to this server (if required)",
      :wizard => true)
    BotConfig.register BotConfigStringValue.new('server.bindhost',
      :default => false, :requires_restart => true,
      :desc => "Specific local host or IP for the bot to bind to (if required)",
      :wizard => true)
    BotConfig.register BotConfigIntegerValue.new('server.reconnect_wait',
      :default => 5, :validate => Proc.new{|v| v >= 0},
      :desc => "Seconds to wait before attempting to reconnect, on disconnect")
    BotConfig.register BotConfigStringValue.new('irc.nick', :default => "rbot",
      :desc => "IRC nickname the bot should attempt to use", :wizard => true,
      :on_change => Proc.new{|bot, v| bot.sendq "NICK #{v}" })
    BotConfig.register BotConfigStringValue.new('irc.user', :default => "rbot",
      :requires_restart => true,
      :desc => "local user the bot should appear to be", :wizard => true)
    BotConfig.register BotConfigArrayValue.new('irc.join_channels',
      :default => [], :wizard => true,
      :desc => "What channels the bot should always join at startup. List multiple channels using commas to separate. If a channel requires a password, use a space after the channel name. e.g: '#chan1, #chan2, #secretchan secritpass, #chan3'")
    BotConfig.register BotConfigIntegerValue.new('core.save_every',
      :default => 60, :validate => Proc.new{|v| v >= 0},
      # TODO change timer via on_change proc
      :desc => "How often the bot should persist all configuration to disk (in case of a server crash, for example")
    BotConfig.register BotConfigFloatValue.new('server.sendq_delay',
      :default => 2.0, :validate => Proc.new{|v| v >= 0},
      :desc => "(flood prevention) the delay between sending messages to the server (in seconds)",
      :on_change => Proc.new {|bot, v| bot.socket.sendq_delay = v })
    BotConfig.register BotConfigIntegerValue.new('server.sendq_burst',
      :default => 4, :validate => Proc.new{|v| v >= 0},
      :desc => "(flood prevention) max lines to burst to the server before throttling. Most ircd's allow bursts of up 5 lines, with non-burst limits of 512 bytes/2 seconds",
      :on_change => Proc.new {|bot, v| bot.socket.sendq_burst = v })
    BotConfig.register BotConfigIntegerValue.new('server.ping_timeout',
      :default => 10, :validate => Proc.new{|v| v >= 0},
      :on_change => Proc.new {|bot, v| bot.start_server_pings},
      :desc => "reconnect if server doesn't respond to PING within this many seconds (set to 0 to disable)")

    @argv = params[:argv]

    unless FileTest.directory? Config::datadir
      puts "data directory '#{Config::datadir}' not found, did you setup.rb?"
      exit 2
    end
    
    botclass = "#{Etc.getpwuid(Process::Sys.geteuid)[:dir]}/.rbot" unless botclass
    #botclass = "#{ENV['HOME']}/.rbot" unless botclass
    botclass = File.expand_path(botclass)
    @botclass = botclass.gsub(/\/$/, "")

    unless FileTest.directory? botclass
      puts "no #{botclass} directory found, creating from templates.."
      if FileTest.exist? botclass
        puts "Error: file #{botclass} exists but isn't a directory"
        exit 2
      end
      FileUtils.cp_r Config::datadir+'/templates', botclass
    end
    
    Dir.mkdir("#{botclass}/logs") unless File.exist?("#{botclass}/logs")
    Dir.mkdir("#{botclass}/registry") unless File.exist?("#{botclass}/registry")

    @ping_timer = nil
    @pong_timer = nil
    @last_ping = nil
    @startup_time = Time.new
    @config = BotConfig.new(self)
# TODO background self after botconfig has a chance to run wizard
    @timer = Timer::Timer.new(1.0) # only need per-second granularity
    @registry = BotRegistry.new self
    @timer.add(@config['core.save_every']) { save } if @config['core.save_every']
    @channels = Hash.new
    @logs = Hash.new
    @httputil = Utils::HttpUtil.new(self)
    @lang = Language::Language.new(@config['core.language'])
    @keywords = Keywords.new(self)
    @auth = IrcAuth.new(self)

    Dir.mkdir("#{botclass}/plugins") unless File.exist?("#{botclass}/plugins")
    @plugins = Plugins::Plugins.new(self, ["#{botclass}/plugins"])

    @socket = IrcSocket.new(@config['server.name'], @config['server.port'], @config['server.bindhost'], @config['server.sendq_delay'], @config['server.sendq_burst'])
    @nick = @config['irc.nick']

    @client = IrcClient.new
    @client[:privmsg] = proc { |data|
      message = PrivMessage.new(self, data[:source], data[:target], data[:message])
      onprivmsg(message)
    }
    @client[:notice] = proc { |data|
      message = NoticeMessage.new(self, data[:source], data[:target], data[:message])
      # pass it off to plugins that want to hear everything
      @plugins.delegate "listen", message
    }
    @client[:motd] = proc { |data|
      data[:motd].each_line { |line|
        log "MOTD: #{line}", "server"
      }
    }
    @client[:nicktaken] = proc { |data| 
      nickchg "#{data[:nick]}_"
    }
    @client[:badnick] = proc {|data| 
      puts "WARNING, bad nick (#{data[:nick]})"
    }
    @client[:ping] = proc {|data|
      # (jump the queue for pongs)
      @socket.puts "PONG #{data[:pingid]}"
    }
    @client[:pong] = proc {|data|
      @last_ping = nil
    }
    @client[:nick] = proc {|data|
      sourcenick = data[:sourcenick]
      nick = data[:nick]
      m = NickMessage.new(self, data[:source], data[:sourcenick], data[:nick])
      if(sourcenick == @nick)
        debug "my nick is now #{nick}"
        @nick = nick
      end
      @channels.each {|k,v|
        if(v.users.has_key?(sourcenick))
          log "@ #{sourcenick} is now known as #{nick}", k
          v.users[nick] = v.users[sourcenick]
          v.users.delete(sourcenick)
        end
      }
      @plugins.delegate("listen", m)
      @plugins.delegate("nick", m)
    }
    @client[:quit] = proc {|data|
      source = data[:source]
      sourcenick = data[:sourcenick]
      sourceurl = data[:sourceaddress]
      message = data[:message]
      m = QuitMessage.new(self, data[:source], data[:sourcenick], data[:message])
      if(data[:sourcenick] =~ /#{Regexp.escape(@nick)}/i)
      else
        @channels.each {|k,v|
          if(v.users.has_key?(sourcenick))
            log "@ Quit: #{sourcenick}: #{message}", k
            v.users.delete(sourcenick)
          end
        }
      end
      @plugins.delegate("listen", m)
      @plugins.delegate("quit", m)
    }
    @client[:mode] = proc {|data|
      source = data[:source]
      sourcenick = data[:sourcenick]
      sourceurl = data[:sourceaddress]
      channel = data[:channel]
      targets = data[:targets]
      modestring = data[:modestring]
      log "@ Mode #{modestring} #{targets} by #{sourcenick}", channel
    }
    @client[:welcome] = proc {|data|
      log "joined server #{data[:source]} as #{data[:nick]}", "server"
      debug "I think my nick is #{@nick}, server thinks #{data[:nick]}"
      if data[:nick] && data[:nick].length > 0
        @nick = data[:nick]
      end

      @plugins.delegate("connect")

      @config['irc.join_channels'].each {|c|
        debug "autojoining channel #{c}"
        if(c =~ /^(\S+)\s+(\S+)$/i)
          join $1, $2
        else
          join c if(c)
        end
      }
    }
    @client[:join] = proc {|data|
      m = JoinMessage.new(self, data[:source], data[:channel], data[:message])
      onjoin(m)
    }
    @client[:part] = proc {|data|
      m = PartMessage.new(self, data[:source], data[:channel], data[:message])
      onpart(m)
    }
    @client[:kick] = proc {|data|
      m = KickMessage.new(self, data[:source], data[:target],data[:channel],data[:message]) 
      onkick(m)
    }
    @client[:invite] = proc {|data|
      if(data[:target] =~ /^#{Regexp.escape(@nick)}$/i)
        join data[:channel] if (@auth.allow?("join", data[:source], data[:sourcenick]))
      end
    }
    @client[:changetopic] = proc {|data|
      channel = data[:channel]
      sourcenick = data[:sourcenick]
      topic = data[:topic]
      timestamp = data[:unixtime] || Time.now.to_i
      if(sourcenick == @nick)
        log "@ I set topic \"#{topic}\"", channel
      else
        log "@ #{sourcenick} set topic \"#{topic}\"", channel
      end
      m = TopicMessage.new(self, data[:source], data[:channel], timestamp, data[:topic])

      ontopic(m)
      @plugins.delegate("listen", m)
      @plugins.delegate("topic", m)
    }
    @client[:topic] = @client[:topicinfo] = proc {|data|
      channel = data[:channel]
      m = TopicMessage.new(self, data[:source], data[:channel], data[:unixtime], data[:topic])
        ontopic(m)
    }
    @client[:names] = proc {|data|
      channel = data[:channel]
      users = data[:users]
      unless(@channels[channel])
        puts "bug: got names for channel '#{channel}' I didn't think I was in\n"
        exit 2
      end
      @channels[channel].users.clear
      users.each {|u|
        @channels[channel].users[u[0].sub(/^[@&~+]/, '')] = ["mode", u[1]]
      }
    }
    @client[:unknown] = proc {|data|
      #debug "UNKNOWN: #{data[:serverstring]}"
      log data[:serverstring], ".unknown"
    }
  end

  # connect the bot to IRC
  def connect
    begin
      trap("SIGINT") { quit }
      trap("SIGTERM") { quit }
      trap("SIGHUP") { quit }
    rescue
      debug "failed to trap signals, probably running on windows?"
    end
    begin
      @socket.connect
    rescue => e
      raise "failed to connect to IRC server at #{@config['server.name']} #{@config['server.port']}: " + e
    end
    @socket.puts "PASS " + @config['server.password'] if @config['server.password']
    @socket.puts "NICK #{@nick}\nUSER #{@config['irc.user']} 4 #{@config['server.name']} :Ruby bot. (c) Tom Gilbert"
    start_server_pings
  end

  # begin event handling loop
  def mainloop
    while true
      begin
        connect
        @timer.start
      
        while true
          if @socket.select
            break unless reply = @socket.gets
            @client.process reply
          end
        end
      # I despair of this. Some of my users get "connection reset by peer"
      # exceptions that ARENT SocketError's. How am I supposed to handle
      # that?
      #rescue TimeoutError, SocketError => e
      rescue SystemExit
        exit 0
      rescue Exception => e
        puts "network exception: connection closed: #{e.inspect}"
        puts e.backtrace.join("\n")
        @socket.shutdown # now we reconnect
      rescue => e
        puts "unexpected exception: connection closed: #{e.inspect}"
        puts e.backtrace.join("\n")
        exit 2
      end
      
      puts "disconnected"
      @last_ping = nil
      @channels.clear
      @socket.clearq
      
      puts "waiting to reconnect"
      sleep @config['server.reconnect_wait']
    end
  end
  
  # type:: message type
  # where:: message target
  # message:: message text
  # send message +message+ of type +type+ to target +where+
  # Type can be PRIVMSG, NOTICE, etc, but those you should really use the
  # relevant say() or notice() methods. This one should be used for IRCd
  # extensions you want to use in modules.
  def sendmsg(type, where, message)
    # limit it 440 chars + CRLF.. so we have to split long lines
    left = 440 - type.length - where.length - 3
    begin
      if(left >= message.length)
        sendq("#{type} #{where} :#{message}")
        log_sent(type, where, message)
        return
      end
      line = message.slice!(0, left)
      lastspace = line.rindex(/\s+/)
      if(lastspace)
        message = line.slice!(lastspace, line.length) + message
        message.gsub!(/^\s+/, "")
      end
      sendq("#{type} #{where} :#{line}")
      log_sent(type, where, line)
    end while(message.length > 0)
  end

  # queue an arbitraty message for the server
  def sendq(message="")
    # temporary
    @socket.queue(message)
  end

  # send a notice message to channel/nick +where+
  def notice(where, message)
    message.each_line { |line|
      line.chomp!
      next unless(line.length > 0)
      sendmsg("NOTICE", where, line)
    }
  end

  # say something (PRIVMSG) to channel/nick +where+
  def say(where, message)
    message.to_s.gsub(/[\r\n]+/, "\n").each_line { |line|
      line.chomp!
      next unless(line.length > 0)
      unless((where =~ /^#/) && (@channels.has_key?(where) && @channels[where].quiet))
        sendmsg("PRIVMSG", where, line)
      end
    }
  end

  # perform a CTCP action with message +message+ to channel/nick +where+
  def action(where, message)
    sendq("PRIVMSG #{where} :\001ACTION #{message}\001")
    if(where =~ /^#/)
      log "* #{@nick} #{message}", where
    elsif (where =~ /^(\S*)!.*$/)
         log "* #{@nick}[#{where}] #{message}", $1
    else
         log "* #{@nick}[#{where}] #{message}", where
    end
  end

  # quick way to say "okay" (or equivalent) to +where+
  def okay(where)
    say where, @lang.get("okay")
  end

  # log message +message+ to a file determined by +where+. +where+ can be a
  # channel name, or a nick for private message logging
  def log(message, where="server")
    message = message.chomp
    stamp = Time.now.strftime("%Y/%m/%d %H:%M:%S")
    where = where.gsub(/[:!?$*()\/\\<>|"']/, "_")
    unless(@logs.has_key?(where))
      @logs[where] = File.new("#{@botclass}/logs/#{where}", "a")
      @logs[where].sync = true
    end
    @logs[where].puts "[#{stamp}] #{message}"
    #debug "[#{stamp}] <#{where}> #{message}"
  end
  
  # set topic of channel +where+ to +topic+
  def topic(where, topic)
    sendq "TOPIC #{where} :#{topic}"
  end

  # disconnect from the server and cleanup all plugins and modules
  def shutdown(message = nil)
    begin
      trap("SIGINT", "DEFAULT")
      trap("SIGTERM", "DEFAULT")
      trap("SIGHUP", "DEFAULT")
    rescue
      debug "failed to trap signals, probably running on windows?"
    end
    message = @lang.get("quit") if (message.nil? || message.empty?)
    debug "Clearing socket"
    @socket.clearq
    debug "Saving"
    save
    debug "Cleaning up"
    @plugins.cleanup
    debug "Logging quits"
    @channels.each_value {|v|
      log "@ quit (#{message})", v.name
    }
    # debug "Closing registries"
    # @registry.close
    debug "Cleaning up the db environment"
    DBTree.cleanup_env
    debug "Sending quit message"
    @socket.puts "QUIT :#{message}"
    debug "Flushing socket"
    @socket.flush
    debug "Shutting down socket"
    @socket.shutdown
    puts "rbot quit (#{message})"
  end
  
  # message:: optional IRC quit message
  # quit IRC, shutdown the bot
  def quit(message=nil)
    begin
      shutdown(message)
    ensure
      exit 0
    end
  end

  # totally shutdown and respawn the bot
  def restart(message = false)
    msg = message ? message : "restarting, back in #{@config['server.reconnect_wait']}..."
    shutdown(msg)
    sleep @config['server.reconnect_wait']
    # now we re-exec
    exec($0, *@argv)
  end

  # call the save method for bot's config, keywords, auth and all plugins
  def save
    @config.save
    @keywords.save
    @auth.save
    @plugins.save
    DBTree.cleanup_logs
  end

  # call the rescan method for the bot's lang, keywords and all plugins
  def rescan
    @lang.rescan
    @plugins.rescan
    @keywords.rescan
  end
  
  # channel:: channel to join
  # key::     optional channel key if channel is +s
  # join a channel
  def join(channel, key=nil)
    if(key)
      sendq "JOIN #{channel} :#{key}"
    else
      sendq "JOIN #{channel}"
    end
  end

  # part a channel
  def part(channel, message="")
    sendq "PART #{channel} :#{message}"
  end

  # attempt to change bot's nick to +name+
  def nickchg(name)
      sendq "NICK #{name}"
  end

  # changing mode
  def mode(channel, mode, target)
      sendq "MODE #{channel} #{mode} #{target}"
  end
  
  # m::     message asking for help
  # topic:: optional topic help is requested for
  # respond to online help requests
  def help(topic=nil)
    topic = nil if topic == ""
    case topic
    when nil
      helpstr = "help topics: core, auth, keywords"
      helpstr += @plugins.helptopics
      helpstr += " (help <topic> for more info)"
    when /^core$/i
      helpstr = corehelp
    when /^core\s+(.+)$/i
      helpstr = corehelp $1
    when /^auth$/i
      helpstr = @auth.help
    when /^auth\s+(.+)$/i
      helpstr = @auth.help $1
    when /^keywords$/i
      helpstr = @keywords.help
    when /^keywords\s+(.+)$/i
      helpstr = @keywords.help $1
    else
      unless(helpstr = @plugins.help(topic))
        helpstr = "no help for topic #{topic}"
      end
    end
    return helpstr
  end

  # returns a string describing the current status of the bot (uptime etc)
  def status
    secs_up = Time.new - @startup_time
    uptime = Utils.secs_to_string secs_up
    # return "Uptime #{uptime}, #{@plugins.length} plugins active, #{@registry.length} items stored in registry, #{@socket.lines_sent} lines sent, #{@socket.lines_received} received."
    return "Uptime #{uptime}, #{@plugins.length} plugins active, #{@socket.lines_sent} lines sent, #{@socket.lines_received} received."
  end

  # we'll ping the server every 30 seconds or so, and expect a response
  # before the next one come around..
  def start_server_pings
    @last_ping = nil
    # stop existing timers if running
    unless @ping_timer.nil?
      @timer.remove @ping_timer
      @ping_timer = nil
    end
    unless @pong_timer.nil?
      @timer.remove @pong_timer
      @pong_timer = nil
    end
    return unless @config['server.ping_timeout'] > 0
    # we want to respond to a hung server within 30 secs or so
    @ping_timer = @timer.add(30) {
      @last_ping = Time.now
      @socket.puts "PING :rbot"
    }
    @pong_timer = @timer.add(10) {
      unless @last_ping.nil?
        diff = Time.now - @last_ping
        unless diff < @config['server.ping_timeout']
          debug "no PONG from server for #{diff} seconds, reconnecting"
          begin
            @socket.shutdown
            # TODO
            # raise an exception to get back to the mainloop
          rescue
            debug "couldn't shutdown connection (already shutdown?)"
          end
          @last_ping = nil
        end
      end
    }
  end

  private

  # handle help requests for "core" topics
  def corehelp(topic="")
    case topic
      when "quit"
        return "quit [<message>] => quit IRC with message <message>"
      when "restart"
        return "restart => completely stop and restart the bot (including reconnect)"
      when "join"
        return "join <channel> [<key>] => join channel <channel> with secret key <key> if specified. #{@nick} also responds to invites if you have the required access level"
      when "part"
        return "part <channel> => part channel <channel>"
      when "hide"
        return "hide => part all channels"
      when "save"
        return "save => save current dynamic data and configuration"
      when "rescan"
        return "rescan => reload modules and static facts"
      when "nick"
        return "nick <nick> => attempt to change nick to <nick>"
      when "say"
        return "say <channel>|<nick> <message> => say <message> to <channel> or in private message to <nick>"
      when "action"
        return "action <channel>|<nick> <message> => does a /me <message> to <channel> or in private message to <nick>"
	#       when "topic"
	#         return "topic <channel> <message> => set topic of <channel> to <message>"
      when "quiet"
        return "quiet [in here|<channel>] => with no arguments, stop speaking in all channels, if \"in here\", stop speaking in this channel, or stop speaking in <channel>"
      when "talk"
        return "talk [in here|<channel>] => with no arguments, resume speaking in all channels, if \"in here\", resume speaking in this channel, or resume speaking in <channel>"
      when "version"
        return "version => describes software version"
      when "botsnack"
        return "botsnack => reward #{@nick} for being good"
      when "hello"
        return "hello|hi|hey|yo [#{@nick}] => greet the bot"
      else
        return "Core help topics: quit, restart, config, join, part, hide, save, rescan, nick, say, action, topic, quiet, talk, version, botsnack, hello"
    end
  end

  # handle incoming IRC PRIVMSG +m+
  def onprivmsg(m)
    # log it first
    if(m.action?)
      if(m.private?)
        log "* [#{m.sourcenick}(#{m.sourceaddress})] #{m.message}", m.sourcenick
      else
        log "* #{m.sourcenick} #{m.message}", m.target
      end
    else
      if(m.public?)
        log "<#{m.sourcenick}> #{m.message}", m.target
      else
        log "[#{m.sourcenick}(#{m.sourceaddress})] #{m.message}", m.sourcenick
      end
    end

    # pass it off to plugins that want to hear everything
    @plugins.delegate "listen", m

    if(m.private? && m.message =~ /^\001PING\s+(.+)\001/)
      notice m.sourcenick, "\001PING #$1\001"
      log "@ #{m.sourcenick} pinged me"
      return
    end

    if(m.address?)
      delegate_privmsg(m)
      case m.message
        when (/^join\s+(\S+)\s+(\S+)$/i)
          join $1, $2 if(@auth.allow?("join", m.source, m.replyto))
        when (/^join\s+(\S+)$/i)
          join $1 if(@auth.allow?("join", m.source, m.replyto))
        when (/^part$/i)
          part m.target if(m.public? && @auth.allow?("join", m.source, m.replyto))
        when (/^part\s+(\S+)$/i)
          part $1 if(@auth.allow?("join", m.source, m.replyto))
        when (/^quit(?:\s+(.*))?$/i)
          quit $1 if(@auth.allow?("quit", m.source, m.replyto))
        when (/^restart(?:\s+(.*))?$/i)
          restart $1 if(@auth.allow?("quit", m.source, m.replyto))
        when (/^hide$/i)
          join 0 if(@auth.allow?("join", m.source, m.replyto))
        when (/^save$/i)
          if(@auth.allow?("config", m.source, m.replyto))
            save
            m.okay
          end
        when (/^nick\s+(\S+)$/i)
          nickchg($1) if(@auth.allow?("nick", m.source, m.replyto))
        when (/^say\s+(\S+)\s+(.*)$/i)
          say $1, $2 if(@auth.allow?("say", m.source, m.replyto))
        when (/^action\s+(\S+)\s+(.*)$/i)
          action $1, $2 if(@auth.allow?("say", m.source, m.replyto))
	  # when (/^topic\s+(\S+)\s+(.*)$/i)
          #   topic $1, $2 if(@auth.allow?("topic", m.source, m.replyto))
        when (/^mode\s+(\S+)\s+(\S+)\s+(.*)$/i)
          mode $1, $2, $3 if(@auth.allow?("mode", m.source, m.replyto))
        when (/^ping$/i)
          say m.replyto, "pong"
        when (/^rescan$/i)
          if(@auth.allow?("config", m.source, m.replyto))
            m.reply "Saving ..."
            save
            m.reply "Rescanning ..."
            rescan
            m.okay
          end
        when (/^quiet$/i)
          if(auth.allow?("talk", m.source, m.replyto))
            m.okay
            @channels.each_value {|c| c.quiet = true }
          end
        when (/^quiet in (\S+)$/i)
          where = $1
          if(auth.allow?("talk", m.source, m.replyto))
            m.okay
            where.gsub!(/^here$/, m.target) if m.public?
            @channels[where].quiet = true if(@channels.has_key?(where))
          end
        when (/^talk$/i)
          if(auth.allow?("talk", m.source, m.replyto))
            @channels.each_value {|c| c.quiet = false }
            m.okay
          end
        when (/^talk in (\S+)$/i)
          where = $1
          if(auth.allow?("talk", m.source, m.replyto))
            where.gsub!(/^here$/, m.target) if m.public?
            @channels[where].quiet = false if(@channels.has_key?(where))
            m.okay
          end
        when (/^status\??$/i)
          m.reply status if auth.allow?("status", m.source, m.replyto)
        when (/^registry stats$/i)
          if auth.allow?("config", m.source, m.replyto)
            m.reply @registry.stat.inspect
          end
        when (/^(help\s+)?config(\s+|$)/)
          @config.privmsg(m)
        when (/^(version)|(introduce yourself)$/i)
          say m.replyto, "I'm a v. #{$version} rubybot, (c) Tom Gilbert - http://linuxbrit.co.uk/rbot/"
        when (/^help(?:\s+(.*))?$/i)
          say m.replyto, help($1)
          #TODO move these to a "chatback" plugin
        when (/^(botsnack|ciggie)$/i)
          say m.replyto, @lang.get("thanks_X") % m.sourcenick if(m.public?)
          say m.replyto, @lang.get("thanks") if(m.private?)
        when (/^(hello|howdy|hola|salut|bonjour|sup|niihau|hey|hi(\W|$)|yo(\W|$)).*/i)
          say m.replyto, @lang.get("hello_X") % m.sourcenick if(m.public?)
          say m.replyto, @lang.get("hello") if(m.private?)
      end
    else
      # stuff to handle when not addressed
      case m.message
        when (/^\s*(hello|howdy|hola|salut|bonjour|sup|niihau|hey|hi|yo(\W|$))[\s,-.]+#{Regexp.escape(@nick)}$/i)
          say m.replyto, @lang.get("hello_X") % m.sourcenick
        when (/^#{Regexp.escape(@nick)}!*$/)
          say m.replyto, @lang.get("hello_X") % m.sourcenick
        else
          @keywords.privmsg(m)
      end
    end
  end

  # log a message. Internal use only.
  def log_sent(type, where, message)
    case type
      when "NOTICE"
        if(where =~ /^#/)
          log "-=#{@nick}=- #{message}", where
        elsif (where =~ /(\S*)!.*/)
             log "[-=#{where}=-] #{message}", $1
        else
             log "[-=#{where}=-] #{message}"
        end
      when "PRIVMSG"
        if(where =~ /^#/)
          log "<#{@nick}> #{message}", where
        elsif (where =~ /^(\S*)!.*$/)
          log "[msg(#{where})] #{message}", $1
        else
          log "[msg(#{where})] #{message}", where
        end
    end
  end

  def onjoin(m)
    @channels[m.channel] = IRCChannel.new(m.channel) unless(@channels.has_key?(m.channel))
    if(m.address?)
      debug "joined channel #{m.channel}"
      log "@ Joined channel #{m.channel}", m.channel
    else
      log "@ #{m.sourcenick} joined channel #{m.channel}", m.channel
      @channels[m.channel].users[m.sourcenick] = Hash.new
      @channels[m.channel].users[m.sourcenick]["mode"] = ""
    end

    @plugins.delegate("listen", m)
    @plugins.delegate("join", m)
  end

  def onpart(m)
    if(m.address?)
      debug "left channel #{m.channel}"
      log "@ Left channel #{m.channel} (#{m.message})", m.channel
      @channels.delete(m.channel)
    else
      log "@ #{m.sourcenick} left channel #{m.channel} (#{m.message})", m.channel
      @channels[m.channel].users.delete(m.sourcenick)
    end
    
    # delegate to plugins
    @plugins.delegate("listen", m)
    @plugins.delegate("part", m)
  end

  # respond to being kicked from a channel
  def onkick(m)
    if(m.address?)
      debug "kicked from channel #{m.channel}"
      @channels.delete(m.channel)
      log "@ You have been kicked from #{m.channel} by #{m.sourcenick} (#{m.message})", m.channel
    else
      @channels[m.channel].users.delete(m.sourcenick)
      log "@ #{m.target} has been kicked from #{m.channel} by #{m.sourcenick} (#{m.message})", m.channel
    end

    @plugins.delegate("listen", m)
    @plugins.delegate("kick", m)
  end

  def ontopic(m)
    @channels[m.channel] = IRCChannel.new(m.channel) unless(@channels.has_key?(m.channel))
    @channels[m.channel].topic = m.topic if !m.topic.nil?
    @channels[m.channel].topic.timestamp = m.timestamp if !m.timestamp.nil?
    @channels[m.channel].topic.by = m.source if !m.source.nil?

	  debug "topic of channel #{m.channel} is now #{@channels[m.channel].topic}"
  end

  # delegate a privmsg to auth, keyword or plugin handlers
  def delegate_privmsg(message)
    [@auth, @plugins, @keywords].each {|m|
      break if m.privmsg(message)
    }
  end
end

end