POE::Component::IRC - A fully event-driven IRC client module

POE-Component-IRC documentation Contained in the POE-Component-IRC distribution.

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NAME

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POE::Component::IRC - A fully event-driven IRC client module

SYNOPSIS

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 # A simple Rot13 'encryption' bot

 use strict;
 use warnings;
 use POE qw(Component::IRC);

 my $nickname = 'Flibble' . $$;
 my $ircname  = 'Flibble the Sailor Bot';
 my $server   = 'irc.perl.org';

 my @channels = ('#Blah', '#Foo', '#Bar');

 # We create a new PoCo-IRC object
 my $irc = POE::Component::IRC->spawn(
    nick => $nickname,
    ircname => $ircname,
    server  => $server,
 ) or die "Oh noooo! $!";

 POE::Session->create(
     package_states => [
         main => [ qw(_default _start irc_001 irc_public) ],
     ],
     heap => { irc => $irc },
 );

 $poe_kernel->run();

 sub _start {
     my $heap = $_[HEAP];

     # retrieve our component's object from the heap where we stashed it
     my $irc = $heap->{irc};

     $irc->yield( register => 'all' );
     $irc->yield( connect => { } );
     return;
 }

 sub irc_001 {
     my $sender = $_[SENDER];

     # Since this is an irc_* event, we can get the component's object by
     # accessing the heap of the sender. Then we register and connect to the
     # specified server.
     my $irc = $sender->get_heap();

     print "Connected to ", $irc->server_name(), "\n";

     # we join our channels
     $irc->yield( join => $_ ) for @channels;
     return;
 }

 sub irc_public {
     my ($sender, $who, $where, $what) = @_[SENDER, ARG0 .. ARG2];
     my $nick = ( split /!/, $who )[0];
     my $channel = $where->[0];

     if ( my ($rot13) = $what =~ /^rot13 (.+)/ ) {
         $rot13 =~ tr[a-zA-Z][n-za-mN-ZA-M];
         $irc->yield( privmsg => $channel => "$nick: $rot13" );
     }
     return;
 }

 # We registered for all events, this will produce some debug info.
 sub _default {
     my ($event, $args) = @_[ARG0 .. $#_];
     my @output = ( "$event: " );

     for my $arg (@$args) {
         if ( ref $arg eq 'ARRAY' ) {
             push( @output, '[' . join(', ', @$arg ) . ']' );
         }
         else {
             push ( @output, "'$arg'" );
         }
     }
     print join ' ', @output, "\n";
     return;
 }

DESCRIPTION

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POE::Component::IRC is a POE component (who'd have guessed?) which acts as an easily controllable IRC client for your other POE components and sessions. You create an IRC component and tell it what events your session cares about and where to connect to, and it sends back interesting IRC events when they happen. You make the client do things by sending it events. That's all there is to it. Cool, no?

[Note that using this module requires some familiarity with the details of the IRC protocol. I'd advise you to read up on the gory details of RFC 1459 (http://www.faqs.org/rfcs/rfc1459.html) before you get started. Keep the list of server numeric codes handy while you program. Needless to say, you'll also need a good working knowledge of POE, or this document will be of very little use to you.]

The POE::Component::IRC distribution has a docs/ folder with a collection of salient documentation including the pertinent RFCs.

POE::Component::IRC consists of a POE::Session that manages the IRC connection and dispatches irc_ prefixed events to interested sessions and an object that can be used to access additional information using methods.

Sessions register their interest in receiving irc_ events by sending register|/register to the component. One would usually do this in your _start handler. Your session will continue to receive events until you unregister|/unregister. The component will continue to stay around until you tell it not to with shutdown|/shutdown.

The SYNOPSIS demonstrates a fairly basic bot.

See POE::Component::IRC::Cookbook (POE::Component::IRC::Cookbook) for more examples.

Useful subclasses

Included with POE::Component::IRC are a number of useful subclasses. As they are subclasses they support all the methods, etc. documented here and have additional methods and quirks which are documented separately:

* POE::Component::IRC::State

POE::Component::IRC::State provides all the functionality of POE::Component::IRC but also tracks IRC state entities such as nicks and channels.

* POE::Component::IRC::Qnet

POE::Component::IRC::Qnet is POE::Component::IRC tweaked for use on Quakenet IRC network.

* POE::Component::IRC::Qnet::State

POE::Component::IRC::Qnet::State is a tweaked version of POE::Component::IRC::State for use on the Quakenet IRC network.

The Plugin system

As of 3.7, PoCo-IRC sports a plugin system. The documentation for it can be read by looking at POE::Component::IRC::Plugin. That is not a subclass, just a placeholder for documentation!

A number of useful plugins have made their way into the core distribution:

* POE::Component::IRC::Plugin::DCC

Provides DCC support. Loaded by default.

* POE::Component::IRC::Plugin::AutoJoin

Keeps you on your favorite channels throughout reconnects and even kicks.

* POE::Component::IRC::Plugin::Connector

Glues an irc bot to an IRC network, i.e. deals with maintaining ircd connections.

* POE::Component::IRC::Plugin::BotTraffic

Under normal circumstances irc bots do not normal the msgs and public msgs that they generate themselves. This plugin enables you to handle those events.

* POE::Component::IRC::Plugin::BotAddressed

Generates irc_bot_addressed / irc_bot_mentioned / irc_bot_mentioned_action events whenever your bot's name comes up in channel discussion.

* POE::Component::IRC::Plugin::BotCommand

Provides an easy way to handle commands issued to your bot.

* POE::Component::IRC::Plugin::Console

See inside the component. See what events are being sent. Generate irc commands manually. A TCP based console.

* POE::Component::IRC::Plugin::FollowTail

Follow the tail of an ever-growing file.

* POE::Component::IRC::Plugin::Logger

Log public and private messages to disk.

* POE::Component::IRC::Plugin::NickServID

Identify with NickServ when needed.

*POE::Component::IRC::Plugin::Proxy

A lightweight IRC proxy/bouncer.

* POE::Component::IRC::Plugin::CTCP

Automagically generates replies to ctcp version, time and userinfo queries.

* POE::Component::IRC::Plugin::PlugMan

An experimental Plugin Manager plugin.

* POE::Component::IRC::Plugin::NickReclaim

Automagically deals with your nickname being in use and reclaiming it.

* POE::Component::IRC::Plugin::CycleEmpty

Cycles (parts and rejoins) channels if they become empty and opless, in order to gain ops.

CONSTRUCTORS

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Both constructors return an object. The object is also available within 'irc_' event handlers by using $_[SENDER]->get_heap(). See also register|/register and irc_registered|/irc_registered.

spawn

Takes a number of arguments, all of which are optional. All the options below may be supplied to the connect|/connect input event as well, except for 'alias', 'options', 'NoDNS', 'debug', and 'plugin_debug'.

* 'alias', a name (kernel alias) that this instance will be known by;
* 'options', a hashref containing POE::Session options;
* 'Server', the server name;
* 'Port', the remote port number;
* 'Password', an optional password for restricted servers;
* 'Nick', your client's IRC nickname;
* 'Username', your client's username;
* 'Ircname', some cute comment or something.
* 'Bitmode', an integer representing your initial user modes set in the USER command. See RFC 2812. If you do not set this, 8 (+i) will be used.
* 'UseSSL', set to some true value if you want to connect using SSL.
* 'Raw', set to some true value to enable the component to send irc_raw|/irc_raw and irc_raw_out|/irc_raw_out events.
* 'LocalAddr', which local IP address on a multihomed box to connect as;
* 'LocalPort', the local TCP port to open your socket on;
* 'NoDNS', set this to 1 to disable DNS lookups using PoCo-Client-DNS. (See note below).
* 'Flood', when true, it disables the component's flood protection algorithms, allowing it to send messages to an IRC server at full speed. Disconnects and k-lines are some common side effects of flooding IRC servers, so care should be used when enabling this option. Default is false.

Two new attributes are 'Proxy' and 'ProxyPort' for sending your =item * 'Proxy', IP address or server name of a proxy server to use.

* 'ProxyPort', which tcp port on the proxy to connect to.
* 'NATAddr', what other clients see as your IP address.
* 'DCCPorts', an arrayref containing tcp ports that can be used for DCC sends.
* 'Resolver', provide a POE::Component::Client::DNS object for the component to use.
* 'msg_length', the maximum length of IRC messages, in bytes. Default is 450. The IRC component shortens all messages longer than this value minus the length of your current nickname. IRC only allows raw protocol lines messages that are 512 bytes or shorter, including the trailing "\r\n". This is most relevant to long PRIVMSGs. The IRC component can't be sure how long your user@host mask will be every time you send a message, considering that most networks mangle the 'user' part and some even replace the whole string (think FreeNode cloaks). If you have an unusually long user@host mask you might want to decrease this value if you're prone to sending long messages. Conversely, if you have an unusually short one, you can increase this value if you want to be able to send as long a message as possible. Be careful though, increase it too much and the IRC server might disconnect you with a "Request too long" message when you try to send a message that's too long.
* 'debug', if set to a true value causes the IRC component to print every message sent to and from the server, as well as print some warnings when it receives malformed messages. This option will be enabled if the POCOIRC_DEBUG environment variable is set to a true value.
* 'plugin_debug', set to some true value to print plugin debug info, default 0. Plugins are processed inside an eval. When you enable this option, you will be notified when (and why) a plugin raises an exception. This option will be enabled if the POCOIRC_DEBUG environment variable is set to a true value.
* 'socks_proxy', specify a SOCKS4/SOCKS4a proxy to use.
* 'socks_port', the SOCKS port to use, defaults to 1080 if not specified.
* 'socks_id', specify a SOCKS user_id. Default is none.
* 'useipv6', enable the use of IPv6 for connections.

spawn will supply reasonable defaults for any of these attributes which are missing, so don't feel obliged to write them all out.

If the component finds that POE::Component::Client::DNS is installed it will use that to resolve the server name passed. Disable this behaviour if you like, by passing: NoDNS => 1.

IRC traffic through a proxy server. 'Proxy''s value should be the IP address or server name of the proxy. 'ProxyPort''s value should be the port on the proxy to connect to. connect|/connect will default to using the actual IRC server's port if you provide a proxy but omit the proxy's port. These are for HTTP Proxies. See 'socks_proxy' for SOCKS4 and SOCKS4a support.

For those people who run bots behind firewalls and/or Network Address Translation there are two additional attributes for DCC. 'DCCPorts', is an arrayref of ports to use when initiating DCC connections. 'NATAddr', is the NAT'ed IP address that your bot is hidden behind, this is sent whenever you do DCC.

SSL support requires POE::Component::SSLify, as well as an IRC server that supports SSL connections. If you're missing POE::Component::SSLify, specifying 'UseSSL' will do nothing. The default is to not try to use SSL.

'Resolver', requires a POE::Component::Client::DNS object. Useful when spawning multiple poco-irc sessions, saves the overhead of multiple dns sessions.

'NoDNS' has different results depending on whether it is set with spawn|/spawn or connect|/connect. Setting it with spawn, disables the creation of the POE::Component::Client::DNS completely. Setting it with connect|/connect on the other hand allows the PoCo-Client-DNS session to be spawned, but will disable any dns lookups using it.

SOCKS4 proxy support is provided by 'socks_proxy', 'socks_port' and 'socks_id' parameters. If something goes wrong with the SOCKS connection you should get a warning on STDERR. This is fairly experimental currently.

IPv6 support is available for connecting to IPv6 enabled ircds (it won't work for DCC though). To enable it, specify 'useipv6'. Perl >=5.14 or Socket6 (for older Perls) is required. If you that and POE::Component::Client::DNS installed and specify a hostname that resolves to an IPv6 address then IPv6 will be used. If you specify an ipv6 'localaddr' then IPv6 will be used.

new

This method is deprecated. See the spawn|/spawn method instead. The first argument should be a name (kernel alias) which this new connection will be known by. Optionally takes more arguments (see spawn|/spawn as name/value pairs. Returns a POE::Component::IRC object. :)

Note: Use of this method will generate a warning. There are currently no plans to make it die() >;]

METHODS

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Information

server

Takes no arguments. Returns the server host we are currently connected to (or trying to connect to).

port

Takes no arguments. Returns the server port we are currently connected to (or trying to connect to).

server_name

Takes no arguments. Returns the name of the IRC server that the component is currently connected to.

server_version

Takes no arguments. Returns the IRC server version.

nick_name

Takes no arguments. Returns a scalar containing the current nickname that the bot is using.

localaddr

Takes no arguments. Returns the IP address being used.

send_queue

The component provides anti-flood throttling. This method takes no arguments and returns a scalar representing the number of messages that are queued up waiting for dispatch to the irc server.

logged_in

Takes no arguments. Returns true or false depending on whether the IRC component is logged into an IRC network.

connected

Takes no arguments. Returns true or false depending on whether the component's socket is currently connected.

disconnect

Takes no arguments. Terminates the socket connection disgracefully >;o]

isupport

Takes one argument, a server capability to query. Returns undef on failure or a value representing the applicable capability. A full list of capabilities is available at http://www.irc.org/tech_docs/005.html.

isupport_dump_keys

Takes no arguments, returns a list of the available server capabilities keys, which can be used with isupport|/isupport.

resolver

Returns a reference to the POE::Component::Client::DNS object that is internally created by the component.

Events

session_id

Inherited from POE::Component::Syndicator

Takes no arguments. Returns the ID of the component's session. Ideal for posting events to the component.

 $kernel->post($irc->session_id() => 'mode' => $channel => '+o' => $dude);

session_alias

Inherited from POE::Component::Syndicator

Takes no arguments. Returns the session alias that has been set through spawn|/spawn's 'alias' argument.

raw_events

With no arguments, returns true or false depending on whether irc_raw|/irc_raw and irc_raw_out|/irc_raw_out events are being generated or not. Provide a true or false argument to enable or disable this feature accordingly.

yield

Inherited from POE::Component::Syndicator

This method provides an alternative object based means of posting events to the component. First argument is the event to post, following arguments are sent as arguments to the resultant post.

 $irc->yield(mode => $channel => '+o' => $dude);

call

Inherited from POE::Component::Syndicator

This method provides an alternative object based means of calling events to the component. First argument is the event to call, following arguments are sent as arguments to the resultant call.

 $irc->call(mode => $channel => '+o' => $dude);

delay

Inherited from POE::Component::Syndicator

This method provides a way of posting delayed events to the component. The first argument is an arrayref consisting of the delayed command to post and any command arguments. The second argument is the time in seconds that one wishes to delay the command being posted.

 my $alarm_id = $irc->delay( [ mode => $channel => '+o' => $dude ], 60 );

Returns an alarm ID that can be used with delay_remove|/delay_remove to cancel the delayed event. This will be undefined if something went wrong.

delay_remove

Inherited from POE::Component::Syndicator

This method removes a previously scheduled delayed event from the component. Takes one argument, the alarm_id that was returned by a delay|/delay method call.

 my $arrayref = $irc->delay_remove( $alarm_id );

Returns an arrayref that was originally requested to be delayed.

send_event

Inherited from POE::Component::Syndicator

Sends an event through the component's event handling system. These will get processed by plugins then by registered sessions. First argument is the event name, followed by any parameters for that event.

send_event_next

Inherited from POE::Component::Syndicator

This sends an event right after the one that's currently being processed. Useful if you want to generate some event which is directly related to another event so you want them to appear together. This method can only be called when POE::Component::IRC is processing an event, e.g. from one of your event handlers. Takes the same arguments as send_event|/send_event.

send_event_now

Inherited from POE::Component::Syndicator

This will send an event to be processed immediately. This means that if an event is currently being processed and there are plugins or sessions which will receive it after you do, then an event sent with send_event_now will be received by those plugins/sessions before the current event. Takes the same arguments as send_event|/send_event.

Plugins

pipeline

Inherited from Object::Pluggable

Returns the Object::Pluggable::Pipeline object.

plugin_add

Inherited from Object::Pluggable

Accepts two arguments:

 The alias for the plugin
 The actual plugin object
 Any number of extra arguments

The alias is there for the user to refer to it, as it is possible to have multiple plugins of the same kind active in one Object::Pluggable object.

This method goes through the pipeline's push() method, which will call $plugin->plugin_register($pluggable, @args).

Returns the number of plugins now in the pipeline if plugin was initialized, undef/an empty list if not.

plugin_del

Inherited from Object::Pluggable

Accepts the following arguments:

 The alias for the plugin or the plugin object itself
 Any number of extra arguments

This method goes through the pipeline's remove() method, which will call $plugin->plugin_unregister($pluggable, @args).

Returns the plugin object if the plugin was removed, undef/an empty list if not.

plugin_get

Inherited from Object::Pluggable

Accepts the following arguments:

 The alias for the plugin

This method goes through the pipeline's get() method.

Returns the plugin object if it was found, undef/an empty list if not.

plugin_list

Inherited from Object::Pluggable

Takes no arguments.

Returns a hashref of plugin objects, keyed on alias, or an empty list if there are no plugins loaded.

plugin_order

Inherited from Object::Pluggable

Takes no arguments.

Returns an arrayref of plugin objects, in the order which they are encountered in the pipeline.

plugin_register

Inherited from Object::Pluggable

Accepts the following arguments:

 The plugin object
 The type of the hook (the hook types are specified with _pluggable_init()'s 'types')
 The event name[s] to watch

The event names can be as many as possible, or an arrayref. They correspond to the prefixed events and naturally, arbitrary events too.

You do not need to supply events with the prefix in front of them, just the names.

It is possible to register for all events by specifying 'all' as an event.

Returns 1 if everything checked out fine, undef/an empty list if something is seriously wrong.

plugin_unregister

Inherited from Object::Pluggable

Accepts the following arguments:

 The plugin object
 The type of the hook (the hook types are specified with _pluggable_init()'s 'types')
 The event name[s] to unwatch

The event names can be as many as possible, or an arrayref. They correspond to the prefixed events and naturally, arbitrary events too.

You do not need to supply events with the prefix in front of them, just the names.

It is possible to register for all events by specifying 'all' as an event.

Returns 1 if all the event name[s] was unregistered, undef if some was not found.

INPUT EVENTS

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How to talk to your new IRC component... here's the events we'll accept. These are events that are posted to the component, either via $poe_kernel->post() or via the object method yield|/yield.

So the following would be functionally equivalent:

 sub irc_001 {
     my ($kernel,$sender) = @_[KERNEL,SENDER];
     my $irc = $sender->get_heap(); # obtain the poco's object

     $irc->yield( privmsg => 'foo' => 'Howdy!' );
     $kernel->post( $sender => privmsg => 'foo' => 'Howdy!' );
     $kernel->post( $irc->session_id() => privmsg => 'foo' => 'Howdy!' );
     $kernel->post( $irc->session_alias() => privmsg => 'foo' => 'Howdy!' );

     return;
 }

Important Commands

register

Inherited from POE::Component::Syndicator

Takes N arguments: a list of event names that your session wants to listen for, minus the irc_ prefix. So, for instance, if you just want a bot that keeps track of which people are on a channel, you'll need to listen for JOINs, PARTs, QUITs, and KICKs to people on the channel you're in. You'd tell POE::Component::IRC that you want those events by saying this:

 $kernel->post('my client', 'register', qw(join part quit kick));

Then, whenever people enter or leave a channel your bot is on (forcibly or not), your session will receive events with names like irc_join|/irc_join, irc_kick|/irc_kick, etc., which you can use to update a list of people on the channel.

Registering for 'all' will cause it to send all IRC-related events to you; this is the easiest way to handle it. See the test script for an example.

Registering will generate an irc_registered|/irc_registered event that your session can trap. ARG0 is the components object. Useful if you want to bolt PoCo-IRC's new features such as Plugins into a bot coded to the older deprecated API. If you are using the new API, ignore this :)

Registering with multiple component sessions can be tricky, especially if one wants to marry up sessions/objects, etc. Check the SIGNALS section for an alternative method of registering with multiple poco-ircs.

Starting with version 4.96, if you spawn the component from inside another POE session, the component will automatically register that session as wanting 'all' irc events. That session will receive an irc_registered|/irc_registered event indicating that the component is up and ready to go.

unregister

Inherited from POE::Component::Syndicator

Takes N arguments: a list of event names which you don't want to receive. If you've previously done a register|/register for a particular event which you no longer care about, this event will tell the IRC connection to stop sending them to you. (If you haven't, it just ignores you. No big deal.)

If you have registered with 'all', attempting to unregister individual events such as 'mode', etc. will not work. This is a 'feature'.

connect

Takes one argument: a hash reference of attributes for the new connection, see spawn|/spawn for details. This event tells the IRC client to connect to a new/different server. If it has a connection already open, it'll close it gracefully before reconnecting.

ctcp and ctcpreply

Sends a CTCP query or response to the nick(s) or channel(s) which you specify. Takes 2 arguments: the nick or channel to send a message to (use an array reference here to specify multiple recipients), and the plain text of the message to send (the CTCP quoting will be handled for you). The "/me" command in popular IRC clients is actually a CTCP action.

 # Doing a /me
 $irc->yield(ctcp => $channel => 'ACTION dances.');

join

Tells your IRC client to join a single channel of your choice. Takes at least one arg: the channel name (required) and the channel key (optional, for password-protected channels).

kick

Tell the IRC server to forcibly evict a user from a particular channel. Takes at least 2 arguments: a channel name, the nick of the user to boot, and an optional witty message to show them as they sail out the door.

remove

Tell the IRC server to forcibly evict a user from a particular channel. Takes at least 2 arguments: a channel name, the nick of the user to boot, and an optional witty message to show them as they sail out the door. Similar to KICK but does an enforced PART instead. Not supported by all servers.

mode

Request a mode change on a particular channel or user. Takes at least one argument: the mode changes to effect, as a single string (e.g. "#mychan +sm-p+o"), and any number of optional operands to the mode changes (nicks, hostmasks, channel keys, whatever.) Or just pass them all as one big string and it'll still work, whatever. I regret that I haven't the patience now to write a detailed explanation, but serious IRC users know the details anyhow.

nick

Allows you to change your nickname. Takes exactly one argument: the new username that you'd like to be known as.

nickserv

Talks to NickServ, on networks which have it. Takes any number of arguments.

notice

Sends a NOTICE message to the nick(s) or channel(s) which you specify. Takes 2 arguments: the nick or channel to send a notice to (use an array reference here to specify multiple recipients), and the text of the notice to send.

part

Tell your IRC client to leave the channels which you pass to it. Takes any number of arguments: channel names to depart from. If the last argument doesn't begin with a channel name identifier or contains a space character, it will be treated as a PART message and dealt with accordingly.

privmsg

Sends a public or private message to the nick(s) or channel(s) which you specify. Takes 2 arguments: the nick or channel to send a message to (use an array reference here to specify multiple recipients), and the text of the message to send.

Have a look at the constants in IRC::Utils if you would like to use formatting and color codes in your messages.

quit

Tells the IRC server to disconnect you. Takes one optional argument: some clever, witty string that other users in your channels will see as you leave. You can expect to get an irc_disconnected|/irc_disconnected event shortly after sending this.

shutdown

By default, POE::Component::IRC sessions never go away. Even after they're disconnected, they're still sitting around in the background, waiting for you to call connect|/connect on them again to reconnect. (Whether this behavior is the Right Thing is doubtful, but I don't want to break backwards compatibility at this point.) You can send the IRC session a shutdown event manually to make it delete itself.

If you are logged into an IRC server, shutdown first will send a quit message and wait to be disconnected. It will wait for up to 5 seconds before forcibly disconnecting from the IRC server. If you provide an argument, that will be used as the QUIT message. If you provide two arguments, the second one will be used as the timeout (in seconds).

Terminating multiple components can be tricky. Check the SIGNALS section for a method of shutting down multiple poco-ircs.

topic

Retrieves or sets the topic for particular channel. If called with just the channel name as an argument, it will ask the server to return the current topic. If called with the channel name and a string, it will set the channel topic to that string. Supply an empty string to unset a channel topic.

debug

Takes one argument: 0 to turn debugging off or 1 to turn debugging on. This flips the debugging flag in POE::Filter::IRCD, POE::Filter::IRC::Compat, and POE::Component::IRC. This has the same effect as setting Debug in spawn|/spawn or connect|/connect.

Not-So-Important Commands

admin

Asks your server who your friendly neighborhood server administrators are. If you prefer, you can pass it a server name to query, instead of asking the server you're currently on.

away

When sent with an argument (a message describig where you went), the server will note that you're now away from your machine or otherwise preoccupied, and pass your message along to anyone who tries to communicate with you. When sent without arguments, it tells the server that you're back and paying attention.

cap

Used to query/enable/disable IRC protocol capabilities. Takes any number of arguments.

dcc*

See the DCC plugin (loaded by default) documentation for DCC-related commands.

info

Basically the same as the version|/version command, except that the server is permitted to return any information about itself that it thinks is relevant. There's some nice, specific standards-writing for ya, eh?

invite

Invites another user onto an invite-only channel. Takes 2 arguments: the nick of the user you wish to admit, and the name of the channel to invite them to.

ison

Asks the IRC server which users out of a list of nicknames are currently online. Takes any number of arguments: a list of nicknames to query the IRC server about.

Asks the server for a list of servers connected to the IRC network. Takes two optional arguments, which I'm too lazy to document here, so all you would-be linklooker writers should probably go dig up the RFC.

list

Asks the server for a list of visible channels and their topics. Takes any number of optional arguments: names of channels to get topic information for. If called without any channel names, it'll list every visible channel on the IRC network. This is usually a really big list, so don't do this often.

motd

Request the server's "Message of the Day", a document which typically contains stuff like the server's acceptable use policy and admin contact email addresses, et cetera. Normally you'll automatically receive this when you log into a server, but if you want it again, here's how to do it. If you'd like to get the MOTD for a server other than the one you're logged into, pass it the server's hostname as an argument; otherwise, no arguments.

names

Asks the server for a list of nicknames on particular channels. Takes any number of arguments: names of channels to get lists of users for. If called without any channel names, it'll tell you the nicks of everyone on the IRC network. This is a really big list, so don't do this much.

quote

Sends a raw line of text to the server. Takes one argument: a string of a raw IRC command to send to the server. It is more optimal to use the events this module supplies instead of writing raw IRC commands yourself.

stats

Returns some information about a server. Kinda complicated and not terribly commonly used, so look it up in the RFC if you're curious. Takes as many arguments as you please.

time

Asks the server what time it thinks it is, which it will return in a human-readable form. Takes one optional argument: a server name to query. If not supplied, defaults to current server.

trace

If you pass a server name or nick along with this request, it asks the server for the list of servers in between you and the thing you mentioned. If sent with no arguments, it will show you all the servers which are connected to your current server.

users

Asks the server how many users are logged into it. Defaults to the server you're currently logged into; however, you can pass a server name as the first argument to query some other machine instead.

version

Asks the server about the version of ircd that it's running. Takes one optional argument: a server name to query. If not supplied, defaults to current server.

who

Lists the logged-on users matching a particular channel name, hostname, nickname, or what-have-you. Takes one optional argument: a string for it to search for. Wildcards are allowed; in the absence of this argument, it will return everyone who's currently logged in (bad move). Tack an "o" on the end if you want to list only IRCops, as per the RFC.

whois

Queries the IRC server for detailed information about a particular user. Takes any number of arguments: nicknames or hostmasks to ask for information about. As of version 3.2, you will receive an irc_whois|/irc_whois event in addition to the usual numeric responses. See below for details.

whowas

Asks the server for information about nickname which is no longer connected. Takes at least one argument: a nickname to look up (no wildcards allowed), the optional maximum number of history entries to return, and the optional server hostname to query. As of version 3.2, you will receive an irc_whowas|/irc_whowas event in addition to the usual numeric responses. See below for details.

ping and pong

Included for completeness sake. The component will deal with ponging to pings automatically. Don't worry about it.

Purely Esoteric Commands

die

Tells the IRC server you're connect to, to terminate. Only useful for IRCops, thank goodness. Takes no arguments.

locops

Opers-only command. This one sends a message to all currently logged-on local-opers (+l). This option is specific to EFNet.

oper

In the exceedingly unlikely event that you happen to be an IRC operator, you can use this command to authenticate with your IRC server. Takes 2 arguments: your username and your password.

operwall

Opers-only command. This one sends a message to all currently logged-on global opers. This option is specific to EFNet.

rehash

Tells the IRC server you're connected to, to rehash its configuration files. Only useful for IRCops. Takes no arguments.

restart

Tells the IRC server you're connected to, to shut down and restart itself. Only useful for IRCops, thank goodness. Takes no arguments.

sconnect

Tells one IRC server (which you have operator status on) to connect to another. This is actually the CONNECT command, but I already had an event called connect|/connect, so too bad. Takes the args you'd expect: a server to connect to, an optional port to connect on, and an optional remote server to connect with, instead of the one you're currently on.

squit

Operator-only command used to disconnect server links. Takes two arguments, the server to disconnect and a message explaining your action.

summon

Don't even ask.

servlist

Lists the currently connected services on the network that are visible to you. Takes two optional arguments, a mask for matching service names against, and a service type.

squery

Sends a message to a service. Takes the same arguments as privmsg|/privmsg.

userhost

Asks the IRC server for information about particular nicknames. (The RFC doesn't define exactly what this is supposed to return.) Takes any number of arguments: the nicknames to look up.

wallops

Another opers-only command. This one sends a message to all currently logged-on opers (and +w users); sort of a mass PA system for the IRC server administrators. Takes one argument: some clever, witty message to send.

OUTPUT EVENTS

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The events you will receive (or can ask to receive) from your running IRC component. Note that all incoming event names your session will receive are prefixed by irc_, to inhibit event namespace pollution.

If you wish, you can ask the client to send you every event it generates. Simply register for the event name "all". This is a lot easier than writing a huge list of things you specifically want to listen for.

FIXME: I'd really like to classify these somewhat ("basic", "oper", "ctcp", "dcc", "raw" or some such), and I'd welcome suggestions for ways to make this easier on the user, if you can think of some.

In your event handlers, $_[SENDER] is the particular component session that sent you the event. $_[SENDER]->get_heap() will retrieve the component's object. Useful if you want on-the-fly access to the object and its methods.

Important Events

irc_registered

Inherited from POE::Component::Syndicator

Sent once to the requesting session on registration (see register|/register). ARG0 is a reference tothe component's object.

irc_shutdown

Inherited from POE::Component::Syndicator

Sent to all registered sessions when the component has been asked to shutdown|/shutdown. ARG0 will be the session ID of the requesting session.

irc_connected

The IRC component will send an irc_connected event as soon as it establishes a connection to an IRC server, before attempting to log in. ARG0 is the server name.

NOTE: When you get an irc_connected event, this doesn't mean you can start sending commands to the server yet. Wait until you receive an irc_001|/All numeric events event (the server welcome message) before actually sending anything back to the server.

irc_ctcp

irc_ctcp events are generated upon receipt of CTCP messages, in addition to the irc_ctcp_* events mentioned below. They are identical in every way to these, with one difference: instead of the * being in the method name, it is prepended to the argument list. For example, if someone types /ctcp Flibble foo bar, an irc_ctcp event will be sent with 'foo' as ARG0, and the rest as given below.

It is not recommended that you register for both irc_ctcp and irc_ctcp_* events, since they will both be fired and presumably cause duplication.

irc_ctcp_*

irc_ctcp_whatever events are generated upon receipt of CTCP messages. For instance, receiving a CTCP PING request generates an irc_ctcp_ping event, CTCP ACTION (produced by typing "/me" in most IRC clients) generates an irc_ctcp_action event, blah blah, so on and so forth. ARG0 is the nick!hostmask of the sender. ARG1 is the channel/recipient name(s). ARG2 is the text of the CTCP message. On servers supporting the IDENTIFY-MSG feature (e.g. FreeNode), CTCP ACTIONs will have ARG3, which will be 1 if the sender has identified with NickServ, 0 otherwise.

Note that DCCs are handled separately -- see the DCC plugin.

irc_ctcpreply_*

irc_ctcpreply_whatever messages are just like irc_ctcp_whatever messages, described above, except that they're generated when a response to one of your CTCP queries comes back. They have the same arguments and such as irc_ctcp_* events.

irc_disconnected

The counterpart to irc_connected|/irc_connected, sent whenever a socket connection to an IRC server closes down (whether intentionally or unintentionally). ARG0 is the server name.

irc_error

You get this whenever the server sends you an ERROR message. Expect this to usually be accompanied by the sudden dropping of your connection. ARG0 is the server's explanation of the error.

irc_join

Sent whenever someone joins a channel that you're on. ARG0 is the person's nick!hostmask. ARG1 is the channel name.

irc_invite

Sent whenever someone offers you an invitation to another channel. ARG0 is the person's nick!hostmask. ARG1 is the name of the channel they want you to join.

irc_kick

Sent whenever someone gets booted off a channel that you're on. ARG0 is the kicker's nick!hostmask. ARG1 is the channel name. ARG2 is the nick of the unfortunate kickee. ARG3 is the explanation string for the kick.

irc_mode

Sent whenever someone changes a channel mode in your presence, or when you change your own user mode. ARG0 is the nick!hostmask of that someone. ARG1 is the channel it affects (or your nick, if it's a user mode change). ARG2 is the mode string (i.e., "+o-b"). The rest of the args (ARG3 .. $#_) are the operands to the mode string (nicks, hostmasks, channel keys, whatever).

irc_msg

Sent whenever you receive a PRIVMSG command that was addressed to you privately. ARG0 is the nick!hostmask of the sender. ARG1 is an array reference containing the nick(s) of the recipients. ARG2 is the text of the message. On servers supporting the IDENTIFY-MSG feature (e.g. FreeNode), there will be an additional argument, ARG3, which will be 1 if the sender has identified with NickServ, 0 otherwise.

irc_nick

Sent whenever you, or someone around you, changes nicks. ARG0 is the nick!hostmask of the changer. ARG1 is the new nick that they changed to.

irc_notice

Sent whenever you receive a NOTICE command. ARG0 is the nick!hostmask of the sender. ARG1 is an array reference containing the nick(s) or channel name(s) of the recipients. ARG2 is the text of the NOTICE message.

irc_part

Sent whenever someone leaves a channel that you're on. ARG0 is the person's nick!hostmask. ARG1 is the channel name. ARG2 is the part message.

irc_public

Sent whenever you receive a PRIVMSG command that was sent to a channel. ARG0 is the nick!hostmask of the sender. ARG1 is an array reference containing the channel name(s) of the recipients. ARG2 is the text of the message. On servers supporting the IDENTIFY-MSG feature (e.g. FreeNode), there will be an additional argument, ARG3, which will be 1 if the sender has identified with NickServ, 0 otherwise.

irc_quit

Sent whenever someone on a channel with you quits IRC (or gets KILLed). ARG0 is the nick!hostmask of the person in question. ARG1 is the clever, witty message they left behind on the way out.

irc_socketerr

Sent when a connection couldn't be established to the IRC server. ARG0 is probably some vague and/or misleading reason for what failed.

irc_topic

Sent when a channel topic is set or unset. ARG0 is the nick!hostmask of the sender. ARG1 is the channel affected. ARG2 will be either: a string if the topic is being set; or a zero-length string (i.e. '') if the topic is being unset. Note: replies to queries about what a channel topic *is* (i.e. TOPIC #channel), are returned as numerics, not with this event.

irc_whois

Sent in response to a WHOIS query. ARG0 is a hashref, with the following keys:

* 'nick', the users nickname;
* 'user', the users username;
* 'host', their hostname;
* 'real', their real name;
* 'idle', their idle time in seconds;
* 'signon', the epoch time they signed on (will be undef if ircd does not support this);
* 'channels', an arrayref listing visible channels they are on, the channel is prefixed with '@','+','%' depending on whether they have +o +v or +h;
* 'server', their server (might not be useful on some networks);
* 'oper', whether they are an IRCop, contains the IRC operator string if they are, undef if they aren't.
* 'actually', some ircds report the users actual ip address, that'll be here;
* 'account' , if the user has registered with services (only on ircu/seven IRCDs, such as FreeNode)
* 'identified'. if the user has identified with NICKSERV (only on Hyperion IRCDs)

irc_whowas

Similar to the above, except some keys will be missing.

irc_raw

Enabled by passing Raw => 1 to spawn|/spawn or connect|/connect, or by calling raw_events|/raw_events with a true argument. ARG0 is the raw IRC string received by the component from the IRC server, before it has been mangled by filters and such like.

irc_raw_out

Enabled by passing Raw => 1 to spawn|/spawn or connect|/connect, or by calling raw_events|/raw_events with a true argument. ARG0 is the raw IRC string sent by the component to the the IRC server.

irc_isupport

Emitted by the first event after an irc_005|/All numeric events, to indicate that isupport information has been gathered. ARG0 is the POE::Component::IRC::Plugin::ISupport object.

irc_socks_failed

Emitted whenever we fail to connect successfully to a SOCKS server or the SOCKS server is not actually a SOCKS server. ARG0 will be some vague reason as to what went wrong. Hopefully.

irc_socks_rejected

Emitted whenever a SOCKS connection is rejected by a SOCKS server. ARG0 is the SOCKS code, ARG1 the SOCKS server address, ARG2 the SOCKS port and ARG3 the SOCKS user id (if defined).

irc_plugin_add

Inherited from Object::Pluggable

Emitted whenever a new plugin is added to the pipeline. ARG0 is the plugin alias. ARG1 is the plugin object.

irc_plugin_del

Inherited from Object::Pluggable

Emitted whenever a plugin is removed from the pipeline. ARG0 is the plugin alias. ARG1 is the plugin object.

irc_plugin_error

Inherited from Object::Pluggable

Emitted when an error occurs while executing a plugin handler. ARG0 is the error message. ARG1 is the plugin alias. ARG2 is the plugin object.

Somewhat Less Important Events

irc_cap

A reply from the server regarding protocol capabilities. ARG0 is the CAP subcommand (e.g. 'LS'). ARG1 is the result of the subcommand, unless this is a multi-part reply, in which case ARG1 is '*' and ARG2 contains the result.

irc_dcc_*

See the DCC plugin (loaded by default) documentation for DCC-related events.

irc_ping

An event sent whenever the server sends a PING query to the client. (Don't confuse this with a CTCP PING, which is another beast entirely. If unclear, read the RFC.) Note that POE::Component::IRC will automatically take care of sending the PONG response back to the server for you, although you can still register to catch the event for informational purposes.

irc_snotice

A weird, non-RFC-compliant message from an IRC server. Usually sent during to you during an authentication phase right after you connect, while the server does a hostname lookup or similar tasks. ARG0 is the text of the server's message. ARG1 is the target, which could be '*' or 'AUTH' or whatever. Servers vary as to whether these notices include a server name as the sender, or no sender at all. ARG1 is the sender, if any.

irc_delay_set

Inherited from POE::Component::Syndicator

Emitted on a successful addition of a delayed event using the delay|/delay method. ARG0 will be the alarm_id which can be used later with delay_remove|/delay_remove. Subsequent parameters are the arguments that were passed to delay|/delay.

irc_delay_removed

Inherited from POE::Component::Syndicator

Emitted when a delayed command is successfully removed. ARG0 will be the alarm_id that was removed. Subsequent parameters are the arguments that were passed to delay|/delay.

All numeric events

Most messages from IRC servers are identified only by three-digit numeric codes with undescriptive constant names like RPL_UMODEIS and ERR_NOTOPLEVEL. (Actually, the list of codes in the RFC is kind of out-of-date... the list in the back of Net::IRC::Event.pm is more complete, and different IRC networks have different and incompatible lists. Ack!) As an example, say you wanted to handle event 376 (RPL_ENDOFMOTD, which signals the end of the MOTD message). You'd register for '376', and listen for irc_376 events. Simple, no? ARG0 is the name of the server which sent the message. ARG1 is the text of the message. ARG2 is an array reference of the parsed message, so there is no need to parse ARG1 yourself.

SIGNALS

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The component will handle a number of custom signals that you may send using POE::Kernel's signal method.

POCOIRC_REGISTER

Inherited from POE::Component::Syndicator

Registering with multiple PoCo-IRC components has been a pita. Well, no more, using the power of POE::Kernel signals.

If the component receives a POCOIRC_REGISTER signal it'll register the requesting session and trigger an irc_registered|/irc_registered event. From that event one can get all the information necessary such as the poco-irc object and the SENDER session to do whatever one needs to build a poco-irc dispatch table.

The way the signal handler in PoCo-IRC is written also supports sending the POCOIRC_REGISTER to multiple sessions simultaneously, by sending the signal to the POE Kernel itself.

Pass the signal your session, session ID or alias, and the IRC events (as specified to register|/register).

To register with multiple PoCo-IRCs one can do the following in your session's _start handler:

 sub _start {
     my ($kernel, $session) = @_[KERNEL, SESSION];

     # Registering with multiple pocoircs for 'all' IRC events
     $kernel->signal($kernel, 'POCOIRC_REGISTER', $session->ID(), 'all');

     return:
 }

Each poco-irc will send your session an irc_registered|/irc_registered event:

 sub irc_registered {
     my ($kernel, $sender, $heap, $irc_object) = @_[KERNEL, SENDER, HEAP, ARG0];

     # Get the poco-irc session ID
     my $sender_id = $sender->ID();

     # Or it's alias
     my $poco_alias = $irc_object->session_alias();

     # Store it in our heap maybe
     $heap->{irc_objects}->{ $sender_id } = $irc_object;

     # Make the poco connect
     $irc_object->yield(connect => { });

     return;
 }

POCOIRC_SHUTDOWN

Inherited from POE::Component::Syndicator

Telling multiple poco-ircs to shutdown was a pita as well. The same principle as with registering applies to shutdown too.

Send a POCOIRC_SHUTDOWN to the POE Kernel to terminate all the active poco-ircs simultaneously.

 $poe_kernel->signal($poe_kernel, 'POCOIRC_SHUTDOWN');

Any additional parameters passed to the signal will become your quit messages on each IRC network.

ENCODING

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This can be an issue. Take a look at IRC::Utils' section on it.

BUGS

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A few have turned up in the past and they are sure to again. Please use http://rt.cpan.org/ to report any. Alternatively, email the current maintainer.

DEVELOPMENT

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You can find the latest source on github: http://github.com/bingos/poe-component-irc

The project's developers usually hang out in the #poe IRC channel on irc.perl.org. Do drop us a line.

MAINTAINERS

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Chris BinGOs Williams <chris@bingosnet.co.uk>

Hinrik Örn Sigurðsson <hinrik.sig@gmail.com>

AUTHOR

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Dennis Taylor.

LICENCE

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Copyright (c) Dennis Taylor, Chris Williams and Hinrik Örn Sigurðsson

This module may be used, modified, and distributed under the same terms as Perl itself. Please see the license that came with your Perl distribution for details.

MAD PROPS

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The maddest of mad props go out to Rocco "dngor" Caputo <troc@netrus.net>, for inventing something as mind-bogglingly cool as POE, and to Kevin "oznoid" Lenzo <lenzo@cs.cmu.edu>, for being the attentive parent of our precocious little infobot on #perl.

Further props to a few of the studly bughunters who made this module not suck: Abys <abys@web1-2-3.com>, Addi <addi@umich.edu>, ResDev <ben@reser.org>, and Roderick <roderick@argon.org>. Woohoo!

Kudos to Apocalypse, <apocal@cpan.org>, for the plugin system and to Jeff 'japhy' Pinyan, <japhy@perlmonk.org>, for Pipeline.

Thanks to the merry band of POE pixies from #PoE @ irc.perl.org, including ( but not limited to ), ketas, ct, dec, integral, webfox, immute, perigrin, paulv, alias.

IP functions are shamelessly 'borrowed' from Net::IP by Manuel Valente

Check out the Changes file for further contributors.

SEE ALSO

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RFC 1459 http://www.faqs.org/rfcs/rfc1459.html

http://www.irchelp.org/,

http://poe.perl.org/,

http://www.infobot.org/,

Some good examples reside in the POE cookbook which has a whole section devoted to IRC programming http://poe.perl.org/?POE_Cookbook.

The examples/ folder of this distribution.

POE-Component-IRC documentation Contained in the POE-Component-IRC distribution. 
package POE::Component::IRC;
BEGIN {
  $POE::Component::IRC::AUTHORITY = 'cpan:HINRIK';
}
BEGIN {
  $POE::Component::IRC::VERSION = '6.68';
}

use strict;
use warnings FATAL => 'all';
use Carp;
use POE qw(Wheel::SocketFactory Wheel::ReadWrite Driver::SysRW
           Filter::Line Filter::Stream Filter::Stackable);
use POE::Filter::IRCD;
use POE::Filter::IRC::Compat;
use POE::Component::IRC::Constants qw(:ALL);
use POE::Component::IRC::Plugin qw(:ALL);
use POE::Component::IRC::Plugin::DCC;
use POE::Component::IRC::Plugin::ISupport;
use POE::Component::IRC::Plugin::Whois;
use Socket qw(AF_INET SOCK_STREAM unpack_sockaddr_in inet_ntoa inet_aton);
use base qw(POE::Component::Syndicator);

our ($GOT_SSL, $GOT_CLIENT_DNS, $GOT_SOCKET6, $GOT_ZLIB);

BEGIN {
    eval {
        require POE::Component::SSLify;
        import POE::Component::SSLify qw( Client_SSLify );
        $GOT_SSL = 1;
    };
    eval {
        require POE::Component::Client::DNS;
        $GOT_CLIENT_DNS = 1 if $POE::Component::Client::DNS::VERSION >= 0.99;
    };
    eval {
        require POE::Filter::Zlib::Stream;
        $GOT_ZLIB = 1 if $POE::Filter::Zlib::Stream::VERSION >= 1.96;
    };
    # Socket6 provides AF_INET6 where earlier Perls' Socket don't.
    eval {
        Socket->import(qw(AF_INET6 unpack_sockaddr_in6 inet_ntop));
        $GOT_SOCKET6 = 1;
    };
    if (!$GOT_SOCKET6) {
        eval {
            require Socket6;
            Socket6->import(qw(AF_INET6 unpack_sockaddr_in6 inet_ntop));
            $GOT_SOCKET6 = 1;
        };
        if (!$GOT_SOCKET6) {
            # provide a dummy sub so code compiles
            *AF_INET6 = sub { ~0 };
        }
    }
}

# BINGOS: I have bundled up all the stuff that needs changing
# for inherited classes into _create. This gets called from 'spawn'.
# $self->{OBJECT_STATES_ARRAYREF} contains event mappings to methods that have
# the same name, gets passed to POE::Session->create as $self => [ ];
# $self->{OBJECT_STATES_HASHREF} contains event mappings to methods, where the
# event and the method have diferent names.
# $self->{IRC_CMDS} contains the traditional %irc_commands, mapping commands
# to events and the priority that the command has.
sub _create {
    my ($self) = @_;

    $self->{IRC_CMDS} = {
        rehash    => [ PRI_HIGH,     'noargs',        ],
        die       => [ PRI_HIGH,     'noargs',        ],
        restart   => [ PRI_HIGH,     'noargs',        ],
        quit      => [ PRI_NORMAL,   'oneoptarg',     ],
        version   => [ PRI_HIGH,     'oneoptarg',     ],
        time      => [ PRI_HIGH,     'oneoptarg',     ],
        trace     => [ PRI_HIGH,     'oneoptarg',     ],
        admin     => [ PRI_HIGH,     'oneoptarg',     ],
        info      => [ PRI_HIGH,     'oneoptarg',     ],
        away      => [ PRI_HIGH,     'oneoptarg',     ],
        users     => [ PRI_HIGH,     'oneoptarg',     ],
        lusers    => [ PRI_HIGH,     'oneoptarg',     ],
        locops    => [ PRI_HIGH,     'oneoptarg',     ],
        operwall  => [ PRI_HIGH,     'oneoptarg',     ],
        wallops   => [ PRI_HIGH,     'oneoptarg',     ],
        motd      => [ PRI_HIGH,     'oneoptarg',     ],
        who       => [ PRI_HIGH,     'oneoptarg',     ],
        nick      => [ PRI_HIGH,     'onlyonearg',    ],
        oper      => [ PRI_HIGH,     'onlytwoargs',   ],
        invite    => [ PRI_HIGH,     'onlytwoargs',   ],
        squit     => [ PRI_HIGH,     'onlytwoargs',   ],
        kill      => [ PRI_HIGH,     'onlytwoargs',   ],
        privmsg   => [ PRI_NORMAL,   'privandnotice', ],
        privmsglo => [ PRI_NORMAL+1, 'privandnotice', ],
        privmsghi => [ PRI_NORMAL-1, 'privandnotice', ],
        notice    => [ PRI_NORMAL,   'privandnotice', ],
        noticelo  => [ PRI_NORMAL+1, 'privandnotice', ],
        noticehi  => [ PRI_NORMAL-1, 'privandnotice', ],
        squery    => [ PRI_NORMAL,   'privandnotice', ],
        join      => [ PRI_HIGH,     'oneortwo',      ],
        summon    => [ PRI_HIGH,     'oneortwo',      ],
        sconnect  => [ PRI_HIGH,     'oneandtwoopt',  ],
        whowas    => [ PRI_HIGH,     'oneandtwoopt',  ],
        stats     => [ PRI_HIGH,     'spacesep',      ],
        links     => [ PRI_HIGH,     'spacesep',      ],
        mode      => [ PRI_HIGH,     'spacesep',      ],
        servlist  => [ PRI_HIGH,     'spacesep',      ],
        cap       => [ PRI_HIGH,     'spacesep',      ],
        part      => [ PRI_HIGH,     'commasep',      ],
        names     => [ PRI_HIGH,     'commasep',      ],
        list      => [ PRI_HIGH,     'commasep',      ],
        whois     => [ PRI_HIGH,     'commasep',      ],
        ctcp      => [ PRI_HIGH,     'ctcp',          ],
        ctcpreply => [ PRI_HIGH,     'ctcp',          ],
        ping      => [ PRI_HIGH,     'oneortwo',      ],
        pong      => [ PRI_HIGH,     'oneortwo',      ],
    };

    my %event_map = map {($_ => $self->{IRC_CMDS}->{$_}->[CMD_SUB])}
        keys %{ $self->{IRC_CMDS} };

    $self->{OBJECT_STATES_HASHREF} = {
        %event_map,
        quote => 'sl',
    };

    $self->{OBJECT_STATES_ARRAYREF} = [qw(
        syndicator_started
        _parseline
        _sock_down
        _sock_failed
        _sock_up
        _socks_proxy_connect
        _socks_proxy_response
        debug
        connect
        _resolve_addresses
        _do_connect
        _quit_timeout
        _send_login
        _got_dns_response
        ison
        kick
        remove
        nickserv
        shutdown
        sl
        sl_login
        sl_high
        sl_delayed
        sl_prioritized
        topic
        userhost
    )];

    return;
}

# BINGOS: the component can now configure itself via _configure() from
# either spawn() or connect()
## no critic (Subroutines::ProhibitExcessComplexity)
sub _configure {
    my ($self, $args) = @_;
    my $spawned = 0;

    if (ref $args eq 'HASH' && keys %{ $args }) {
        $spawned = delete $args->{spawned};
        @{ $self }{ keys %{ $args } } = values %{ $args };
    }

    if ($ENV{POCOIRC_DEBUG}) {
        $self->{debug} = 1;
        $self->{plugin_debug} = 1;
    }

    if ($self->{debug}) {
        $self->{ircd_filter}->debug(1);
        $self->{ircd_compat}->debug(1);
    }

    if ($self->{useipv6} && !$GOT_SOCKET6) {
        warn "'useipv6' option specified, but Socket6 was not found\n";
    }

    if ($self->{usessl} && !$GOT_SSL) {
        warn "'usessl' option specified, but POE::Component::SSLify was not found\n";
    }

    $self->{dcc}->nataddr($self->{nataddr}) if exists $self->{nataddr};
    $self->{dcc}->dccports($self->{dccports}) if exists $self->{dccports};

    $self->{port} = 6667 if !$self->{port};
    $self->{msg_length} = 450 if !defined $self->{msg_length};

    if ($self->{localaddr} && $self->{localport}) {
        $self->{localaddr} .= ':' . $self->{localport};
    }

    # Make sure that we have reasonable defaults for all the attributes.
    # The "IRC*" variables are ircII environment variables.
    if (!defined $self->{nick}) {
        $self->{nick} = $ENV{IRCNICK} || eval { scalar getpwuid($>) }
            || $ENV{USER} || $ENV{LOGNAME} || 'WankerBot';
    }

    if (!defined $self->{username}) {
        $self->{username} = eval { scalar getpwuid($>) } || $ENV{USER}
            || $ENV{LOGNAME} || 'foolio';
    }

    if (!defined $self->{ircname}) {
        $self->{ircname} = $ENV{IRCNAME} || eval { (getpwuid $>)[6] }
            || 'Just Another Perl Hacker';
    }

    if (!defined $self->{server} && !$spawned) {
        die "No IRC server specified\n" if !$ENV{IRCSERVER};
        $self->{server} = $ENV{IRCSERVER};
    }

    return;
}

sub debug {
    my ($self, $switch) = @_[OBJECT, ARG0];

    $self->{debug} = $switch;
    $self->{ircd_filter}->debug( $switch );
    $self->{ircd_compat}->debug( $switch );
    return;
}

# Parse a message from the IRC server and generate the appropriate
# event(s) for listening sessions.
sub _parseline {
    my ($session, $self, $ev) = @_[SESSION, OBJECT, ARG0];

    return if !$ev->{name};
    $self->send_event(irc_raw => $ev->{raw_line} ) if $self->{raw};

    # record our nickname
    if ( $ev->{name} eq '001' ) {
        $self->{INFO}{RealNick} = ( split / /, $ev->{raw_line} )[2];
    }

    $ev->{name} = 'irc_' . $ev->{name};
    $self->send_event( $ev->{name}, @{$ev->{args}} );

    if ($ev->{name} =~ /^irc_ctcp_(.+)$/) {
        $self->send_event(irc_ctcp => $1 => @{$ev->{args}});
    }

    return;
}

# Internal function called when a socket is closed.
sub _sock_down {
    my ($kernel, $self) = @_[KERNEL, OBJECT];

    # Destroy the RW wheel for the socket.
    delete $self->{socket};
    $self->{connected} = 0;

    # Stop any delayed sends.
    $self->{send_queue} = [ ];
    $self->{send_time}  = 0;
    $kernel->delay( sl_delayed => undef );

    # Reset the filters if necessary
    $self->_compress_uplink( 0 );
    $self->_compress_downlink( 0 );
    $self->{ircd_compat}->chantypes( [ '#', '&' ] );
    $self->{ircd_compat}->identifymsg(0);

    # post a 'irc_disconnected' to each session that cares
    $self->send_event(irc_disconnected => $self->{server} );
    return;
}

sub disconnect {
    my ($self) = @_;
    $self->yield('_sock_down');
    return;
}

# Internal function called when a socket fails to be properly opened.
sub _sock_failed {
    my ($self, $op, $errno, $errstr) = @_[OBJECT, ARG0..ARG2];

    delete $self->{socketfactory};
    $self->send_event(irc_socketerr => "$op error $errno: $errstr" );
    return;
}

# Internal function called when a connection is established.
sub _sock_up {
    my ($kernel, $self, $session, $socket) = @_[KERNEL, OBJECT, SESSION, ARG0];

    # We no longer need the SocketFactory wheel. Scrap it.
    delete $self->{socketfactory};

    # Remember what IP address we're connected through, for multihomed boxes.
    my $localaddr;
    if ($GOT_SOCKET6) {
        eval {
                $localaddr = (unpack_sockaddr_in6( getsockname $socket ))[1];
                $localaddr = inet_ntop( AF_INET6, $localaddr );
        };
    }

    if ( !$localaddr ) {
        $localaddr = (unpack_sockaddr_in( getsockname $socket ))[1];
        $localaddr = inet_ntoa($localaddr);
    }

    $self->{localaddr} = $localaddr;

    if ( $self->{socks_proxy} ) {
        $self->{socket} = POE::Wheel::ReadWrite->new(
            Handle       => $socket,
            Driver       => POE::Driver::SysRW->new(),
            Filter       => POE::Filter::Stream->new(),
            InputEvent   => '_socks_proxy_response',
            ErrorEvent   => '_sock_down',
        );

        if ( !$self->{socket} ) {
            $self->send_event(irc_socketerr =>
                "Couldn't create ReadWrite wheel for SOCKS socket" );
            return;
        }

        my $packet;
        if ( _ip_is_ipv4( $self->{server} ) ) {
            # SOCKS 4
            $packet = pack ('CCn', 4, 1, $self->{port}) .
            inet_aton($self->{server}) . ($self->{socks_id} || '') . (pack 'x');
        }
        else {
            # SOCKS 4a
            $packet = pack ('CCn', 4, 1, $self->{port}) .
            inet_aton('0.0.0.1') . ($self->{socks_id} || '') . (pack 'x') .
            $self->{server} . (pack 'x');
        }

        $self->{socket}->put( $packet );
        return;
    }

    # ssl!
    if ($GOT_SSL and $self->{usessl}) {
        eval {
            $socket = Client_SSLify($socket);
        };

        if ($@) {
            chomp $@;
            warn "Couldn't use an SSL socket: $@\n";
            $self->{usessl} = 0;
        }
    }

    if ( $self->{compress} ) {
        $self->_compress_uplink(1);
        $self->_compress_downlink(1);
    }

    # Create a new ReadWrite wheel for the connected socket.
    $self->{socket} = POE::Wheel::ReadWrite->new(
        Handle       => $socket,
        Driver       => POE::Driver::SysRW->new(),
        InputFilter  => $self->{srv_filter},
        OutputFilter => $self->{out_filter},
        InputEvent   => '_parseline',
        ErrorEvent   => '_sock_down',
    );

    if ($self->{socket}) {
        $self->{connected} = 1;
    }
    else {
        $self->send_event(irc_socketerr => "Couldn't create ReadWrite wheel for IRC socket");
        return;
    }

    # Post a 'irc_connected' event to each session that cares
    $self->send_event(irc_connected => $self->{server} );

    # CONNECT if we're using a proxy
    if ($self->{proxy}) {
        # The original proxy code, AFAIK, did not actually work
        # with an HTTP proxy.
        $self->call(
            'sl_login',
            'CONNECT ' . $self->{server} . ':' . $self->{port} . " HTTP/1.0\n\n",
        );

        # KLUDGE: Also, the original proxy code assumes the connection
        # is instantaneous Since this is not always the case, mess with
        # the queueing so that the sent text is delayed...
        $self->{send_time} = time() + 10;
    }

    $kernel->yield('_send_login');
    return;
}

sub _socks_proxy_response {
    my ($kernel, $self, $session, $input) = @_[KERNEL, OBJECT, SESSION, ARG0];

    if (length $input != 8) {
        $self->send_event(
            'irc_socks_failed',
            'Mangled response from SOCKS proxy',
            $input,
        );
        $self->disconnect();
        return;
    }

    my @resp = unpack 'CCnN', $input;
    if (@resp != 4 || $resp[0] ne '0' || $resp[1] !~ /^(?:90|91|92|93)$/) {
        $self->send_event(
            'irc_socks_failed',
            'Mangled response from SOCKS proxy',
            $input,
        );
        $self->disconnect();
        return;
    }

    if ( $resp[1] eq '90' ) {
        $kernel->call($session => '_socks_proxy_connect');
        $self->{connected} = 1;
        $self->send_event( 'irc_connected', $self->{server} );
        $kernel->yield('_send_login');
    }
    else {
        $self->send_event(
            'irc_socks_rejected',
            $resp[1],
            $self->{socks_proxy},
            $self->{socks_port},
            $self->{socks_id},
        );
        $self->disconnect();
    }

    return;
}

sub _socks_proxy_connect {
    my ($kernel, $self) = @_[KERNEL, OBJECT];
    $self->{socket}->event( InputEvent => '_parseline' );
    $self->{socket}->set_input_filter( $self->{srv_filter} );
    $self->{socket}->set_output_filter( $self->{out_filter} );
    return;
}

sub _send_login {
    my ($kernel, $self, $session) = @_[KERNEL, OBJECT, SESSION];

    # Now that we're connected, attempt to log into the server.

    # for servers which support CAP, it's customary to start with that
    $kernel->call($session, 'sl_login', 'CAP REQ identify-msg');
    $kernel->call($session, 'sl_login', 'CAP LS');
    $kernel->call($session, 'sl_login', 'CAP END');

    if (defined $self->{password}) {
        $kernel->call($session => sl_login => 'PASS ' . $self->{password});
    }
    $kernel->call($session => sl_login => 'NICK ' . $self->{nick});
    $kernel->call(
        $session,
        'sl_login',
        'USER ' .
        join(' ', $self->{username},
            (defined $self->{bitmode} ? $self->{bitmode} : 8),
            '*',
            ':' . $self->{ircname}
        ),
    );

    # If we have queued data waiting, its flush loop has stopped
    # while we were disconnected.  Start that up again.
    $kernel->delay(sl_delayed => 0);

    return;
}

# Set up the component's IRC session.
sub syndicator_started {
    my ($kernel, $session, $sender, $self, $alias)
        = @_[KERNEL, SESSION, SENDER, OBJECT, ARG0, ARG1 .. $#_];

    # Send queue is used to hold pending lines so we don't flood off.
    # The count is used to track the number of lines sent at any time.
    $self->{send_queue} = [ ];
    $self->{send_time}  = 0;

    $self->{ircd_filter} = POE::Filter::IRCD->new(debug => $self->{debug});
    $self->{ircd_compat} = POE::Filter::IRC::Compat->new(debug => $self->{debug});

    my $srv_filters = [
        POE::Filter::Line->new(
            InputRegexp => '\015?\012',
            OutputLiteral => '\015\012',
        ),
        $self->{ircd_filter},
        $self->{ircd_compat},
    ];

    $self->{srv_filter} = POE::Filter::Stackable->new(Filters => $srv_filters);
    $self->{out_filter} = POE::Filter::Stackable->new(Filters => [
        POE::Filter::Line->new( OutputLiteral => "\015\012" ),
    ]);

    # Plugin 'irc_whois' and 'irc_whowas' support
    $self->plugin_add('Whois_' . $self->session_id(),
        POE::Component::IRC::Plugin::Whois->new()
    );

    $self->{isupport} = POE::Component::IRC::Plugin::ISupport->new();
    $self->plugin_add('ISupport_' . $self->session_id(), $self->{isupport});
    $self->{dcc} = POE::Component::IRC::Plugin::DCC->new();
    $self->plugin_add('DCC_' . $self->session_id(), $self->{dcc});

    return 1;
}

# The handler for commands which have N arguments, separated by commas.
sub commasep {
    my ($kernel, $self, $state, @args) = @_[KERNEL, OBJECT, STATE, ARG0 .. $#_];
    my $args;

    if ($state eq 'whois' and @args > 1 ) {
        $args = shift @args;
        $args .= ' ' . join ',', @args;
    }
    elsif ( $state eq 'part' and @args > 1 ) {
        my $chantypes = join('', @{ $self->isupport('CHANTYPES') || ['#', '&']});
        my $message;
        if ($args[-1] =~ / +/ || $args[-1] !~ /^[$chantypes]/) {
            $message = pop @args;
        }
        $args = join(',', @args);
        $args .= " :$message" if defined $message;
    }
    else {
        $args = join ',', @args;
    }

    my $pri = $self->{IRC_CMDS}->{$state}->[CMD_PRI];
    $state = uc $state;
    $state .= " $args" if defined $args;
    $kernel->yield(sl_prioritized => $pri, $state );

    return;
}

# Get variables in order for openning a connection
sub connect {
    my ($kernel, $self, $session, $sender, $args)
        = @_[KERNEL, OBJECT, SESSION, SENDER, ARG0];

    if ($args) {
        my %arg;
        %arg = @{ $args } if ref $args eq 'ARRAY';
        %arg = %{ $args } if ref $args eq 'HASH';
        $arg{ lc $_ } = delete $arg{$_} for keys %arg;
        $self->_configure( \%arg );
    }

    if ( $self->{resolver} && $self->{res_addresses}
        && @{ $self->{res_addresses} } ) {
        push @{ $self->{res_addresses} }, $self->{server};
        $self->{resolved_server} = shift @{ $self->{res_addresses} };
    }

    # try and use non-blocking resolver if needed
    if ( $self->{resolver} && !_ip_get_version( $self->{server} )
        && !$self->{nodns} ) {
        $kernel->yield(
            '_resolve_addresses',
             $self->{server},
             ( $self->{useipv6} && $GOT_SOCKET6 ? 'AAAA' : 'A' ),
        );
    }
    else {
        $kernel->yield('_do_connect');
    }

    $self->{INFO}{RealNick} = $self->{nick};
    return;
}

sub _resolve_addresses {
    my ($kernel, $self, $hostname, $type) = @_[KERNEL, OBJECT, ARG0 .. ARG1];

    my $response = $self->{resolver}->resolve(
        event => '_got_dns_response',
        host => $hostname,
        type => $type,
        context => { },
    );

    $kernel->yield(_got_dns_response => $response) if $response;
    return;
}

# open the connection
sub _do_connect {
    my ($kernel, $self, $session) = @_[KERNEL, OBJECT, SESSION];
    my $domain = AF_INET;

    # Disconnect if we're already logged into a server.
    $kernel->call($session => 'quit') if $self->{socket};

    if ($self->{socks_proxy} && !$self->{socks_port}) {
        $self->{socks_port} = 1080;
    }

    for my $address (qw(socks_proxy proxy server resolved_server localaddr)) {
        next if !$self->{$address} || !_ip_is_ipv6( $self->{$address} );
        if (!$GOT_SOCKET6) {
            warn "IPv6 address specified for '$address' but Socket6 not found\n";
            return;
        }
        $domain = AF_INET6;
    }

    $self->{socketfactory} = POE::Wheel::SocketFactory->new(
        SocketDomain   => $domain,
        SocketType     => SOCK_STREAM,
        SocketProtocol => 'tcp',
        RemoteAddress  => $self->{socks_proxy} || $self->{proxy} || $self->{resolved_server} || $self->{server},
        RemotePort     => $self->{socks_port} || $self->{proxyport} || $self->{port},
        SuccessEvent   => '_sock_up',
        FailureEvent   => '_sock_failed',
        ($self->{localaddr} ? (BindAddress => $self->{localaddr}) : ()),
    );

    return;
}

# got response from POE::Component::Client::DNS
sub _got_dns_response {
    my ($kernel, $self, $response) = @_[KERNEL, OBJECT, ARG0];

    my $type = uc $response->{type};
    my $net_dns_packet = $response->{response};
    my $net_dns_errorstring = $response->{error};
    $self->{res_addresses} = [ ];

    if (!defined $net_dns_packet) {
        $self->send_event(irc_socketerr => $net_dns_errorstring );
        return;
    }

    my @net_dns_answers = $net_dns_packet->answer;

    for my $net_dns_answer (@net_dns_answers) {
        next if $net_dns_answer->type !~ /^A/;
        push @{ $self->{res_addresses} }, $net_dns_answer->rdatastr;
    }

    if ( !@{ $self->{res_addresses} } && $type eq 'AAAA') {
        $kernel->yield(_resolve_addresses => $self->{server}, 'A');
        return;
    }

    if ( !@{ $self->{res_addresses} } ) {
        $self->send_event(irc_socketerr => 'Unable to resolve ' . $self->{server});
        return;
      }

    if ( my $address = shift @{ $self->{res_addresses} } ) {
        $self->{resolved_server} = $address;
        $kernel->yield('_do_connect');
        return;
    }

    $self->send_event(irc_socketerr => 'Unable to resolve ' . $self->{server});
    return;
}

# Send a CTCP query or reply, with the same syntax as a PRIVMSG event.
sub ctcp {
    my ($kernel, $state, $self, $to) = @_[KERNEL, STATE, OBJECT, ARG0];
    my $message = join ' ', @_[ARG1 .. $#_];

    if (!defined $to || !defined $message) {
        warn "The '$state' event requires two arguments\n";
        return;
    }

    # CTCP-quote the message text.
    ($message) = @{$self->{ircd_compat}->put([ $message ])};

    # Should we send this as a CTCP request or reply?
    $state = $state eq 'ctcpreply' ? 'notice' : 'privmsg';

    $kernel->yield($state, $to, $message);
    return;
}

# The way /notify is implemented in IRC clients.
sub ison {
    my ($kernel, @nicks) = @_[KERNEL, ARG0 .. $#_];
    my $tmp = 'ISON';

    if (!@nicks) {
        warn "The 'ison' event requires one or more nicknames\n";
        return;
    }

    # We can pass as many nicks as we want, as long as it's shorter than
    # the maximum command length (510). If the list we get is too long,
    # w'll break it into multiple ISON commands.
    while (@nicks) {
        my $nick = shift @nicks;
        if (length($tmp) + length($nick) >= 509) {
            $kernel->yield(sl_high => $tmp);
            $tmp = 'ISON';
        }
        $tmp .= " $nick";
    }

    $kernel->yield(sl_high => $tmp);
    return;
}

# Tell the IRC server to forcibly remove a user from a channel.
sub kick {
    my ($kernel, $chan, $nick) = @_[KERNEL, ARG0, ARG1];
    my $message = join '', @_[ARG2 .. $#_];

    if (!defined $chan || !defined $nick) {
        warn "The 'kick' event requires at least two arguments\n";
        return;
    }

    $nick .= " :$message" if defined $message;
    $kernel->yield(sl_high => "KICK $chan $nick");
    return;
}

# Tell the IRC server to forcibly remove a user from a channel. Freenode extension
sub remove {
    my ($kernel, $chan, $nick) = @_[KERNEL, ARG0, ARG1];
    my $message = join '', @_[ARG2 .. $#_];

    if (!defined $chan || !defined $nick) {
        warn "The 'remove' event requires at least two arguments\n";
        return;
    }

    $nick .= " :$message" if defined $message;
    $kernel->yield(sl_high => "REMOVE $chan $nick");
    return;
}

# Interact with NickServ
sub nickserv {
    my ($kernel, $self, $state) = @_[KERNEL, OBJECT, STATE];
    my $args = join ' ', @_[ARG0 .. $#_];

    my $command = 'NICKSERV';
    my $version = $self->server_version();
    $command = 'NS' if defined $version && $version =~ /ratbox/i;
    $command .= " $args" if defined $args;

    $kernel->yield(sl_high => $command);
    return;
}

# Set up a new IRC component. Deprecated.
sub new {
    my ($package, $alias) = splice @_, 0, 2;
    croak "$package options should be an even-sized list" if @_ & 1;
    my %options = @_;

    if (!defined $alias) {
        croak 'Not enough arguments to POE::Component::IRC::new()';
    }

    carp "Use of ${package}->new() is deprecated, please use spawn()";

    my $self = $package->spawn ( alias => $alias, options => \%options );
    return $self;
}

# Set up a new IRC component. New interface.
sub spawn {
    my ($package) = shift;
    croak "$package requires an even number of arguments" if @_ & 1;
    my %params = @_;

    $params{ lc $_ } = delete $params{$_} for keys %params;
    delete $params{options} if ref $params{options} ne 'HASH';

    my $self = bless { }, $package;
    $self->_create();

    if ($ENV{POCOIRC_DEBUG}) {
        $params{debug} = 1;
        $params{plugin_debug} = 1;
    }

    my $options      = delete $params{options};
    my $alias        = delete $params{alias};
    my $plugin_debug = delete $params{plugin_debug};

    $self->_syndicator_init(
        prefix          => 'irc_',
        reg_prefix      => 'PCI_',
        types           => [SERVER => 'S', USER => 'U'],
        alias           => $alias,
        register_signal => 'POCOIRC_REGISTER',
        shutdown_signal => 'POCOIRC_SHUTDOWN',
        object_states   => [
            $self => delete $self->{OBJECT_STATES_HASHREF},
            $self => delete $self->{OBJECT_STATES_ARRAYREF},
        ],
        ($plugin_debug ? (debug => 1) : () ),
        (ref $options eq 'HASH' ? ( options => $options ) : ()),
    );

    $params{spawned} = 1;
    $self->_configure(\%params);

    if (!$params{nodns} && $GOT_CLIENT_DNS && !$self->{resolver}) {
        $self->{resolver} = POE::Component::Client::DNS->spawn(
            Alias => 'resolver' . $self->session_id()
        );
        $self->{mydns} = 1;
    }

    return $self;
}

# The handler for all IRC commands that take no arguments.
sub noargs {
    my ($kernel, $state, $arg) = @_[KERNEL, STATE, ARG0];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    if (defined $arg) {
        warn "The '$state' event takes no arguments\n";
        return;
    }

    $state = uc $state;
    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# The handler for commands that take one required and two optional arguments.
sub oneandtwoopt {
    my ($kernel, $state) = @_[KERNEL, STATE];
    my $arg = join '', @_[ARG0 .. $#_];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    $state = 'connect' if $state eq 'sconnect';
    $state = uc $state;
    if (defined $arg) {
        $arg = ':' . $arg if $arg =~ /\x20/;
        $state .= " $arg";
    }

    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# The handler for commands that take at least one optional argument.
sub oneoptarg {
    my ($kernel, $state) = @_[KERNEL, STATE];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];
    $state = uc $state;

    if (defined $_[ARG0]) {
        my $arg = join '', @_[ARG0 .. $#_];
        $arg = ':' . $arg if $arg =~ /\x20/;
        $state .= " $arg";
    }

    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# The handler for commands which take one required and one optional argument.
sub oneortwo {
    my ($kernel, $state, $one) = @_[KERNEL, STATE, ARG0];
    my $two = join '', @_[ARG1 .. $#_];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    if (!defined $one) {
        warn "The '$state' event requires at least one argument\n";
        return;
    }

    $state = uc( $state ) . " $one";
    $state .= " $two" if defined $two;
    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# Handler for commands that take exactly one argument.
sub onlyonearg {
    my ($kernel, $state) = @_[KERNEL, STATE];
    my $arg = join '', @_[ARG0 .. $#_];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    if (!defined $arg) {
        warn "The '$state' event requires one argument\n";
        return;
    }

    $state = uc $state;
    $arg = ':' . $arg if $arg =~ /\x20/;
    $state .= " $arg";
    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# Handler for commands that take exactly two arguments.
sub onlytwoargs {
    my ($kernel, $state, $one) = @_[KERNEL, STATE, ARG0];
    my ($two) = join '', @_[ARG1 .. $#_];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    if (!defined $one || !defined $two) {
        warn "The '$state' event requires two arguments\n";
        return;
    }

    $state = uc $state;
    $two = ':' . $two if $two =~ /\x20/;
    $state .= " $one $two";
    $kernel->yield(sl_prioritized => $pri, $state);
    return;
}

# Handler for privmsg or notice events.
sub privandnotice {
    my ($kernel, $state, $to, $msg) = @_[KERNEL, STATE, ARG0, ARG1];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    $state =~ s/privmsglo/privmsg/;
    $state =~ s/privmsghi/privmsg/;
    $state =~ s/noticelo/notice/;
    $state =~ s/noticehi/notice/;

    if (!defined $to || !defined $msg) {
        warn "The '$state' event requires two arguments\n";
        return;
    }

    $to = join ',', @$to if ref $to eq 'ARRAY';
    $state = uc $state;

    $kernel->yield(sl_prioritized => $pri, "$state $to :$msg");
    return;
}

# Tell the IRC session to go away.
sub shutdown {
    my ($kernel, $self, $sender, $session) = @_[KERNEL, OBJECT, SENDER, SESSION];
    return if $self->{_shutdown};
    $self->{_shutdown} = $sender->ID();

    if ($self->logged_in()) {
        my ($msg, $timeout) = @_[ARG0, ARG1];
        $msg = '' if !defined $msg;
        $timeout = 5 if !defined $timeout;
        $msg = ":$msg" if $msg =~ /\x20/;
        my $cmd = "QUIT $msg";
        $kernel->call($session => sl_high => $cmd);
        $kernel->delay('_quit_timeout', $timeout);
        $self->{_waiting} = 1;
    }
    elsif ($self->connected()) {
        $self->disconnect();
    }
    else {
        $self->_shutdown();
    }

    return;
}

sub _quit_timeout {
    my ($self) = $_[OBJECT];
    $self->disconnect();
    return;
}

sub _shutdown {
    my ($self) = @_;

    $self->_syndicator_destroy($self->{_shutdown});
    delete $self->{$_} for qw(socketfactory dcc wheelmap);
    $self->{resolver}->shutdown() if $self->{resolver} && $self->{mydns};
    return;
}

# Send a line of login-priority IRC output.  These are things which
# must go first.
sub sl_login {
    my ($kernel, $self) = @_[KERNEL, OBJECT];
    my $arg = join ' ', @_[ARG0 .. $#_];
    $kernel->yield(sl_prioritized => PRI_LOGIN, $arg );
    return;
}

# Send a line of high-priority IRC output.  Things like channel/user
# modes, kick messages, and whatever.
sub sl_high {
    my ($kernel, $self) = @_[KERNEL, OBJECT];
    my $arg = join ' ', @_[ARG0 .. $#_];
    $kernel->yield(sl_prioritized => PRI_HIGH, $arg );
    return;
}

# Send a line of normal-priority IRC output to the server.  PRIVMSG
# and other random chatter.  Uses sl() for compatibility with existing
# code.
sub sl {
    my ($kernel, $self) = @_[KERNEL, OBJECT];
    my $arg = join ' ', @_[ARG0 .. $#_];
    $kernel->yield(sl_prioritized => PRI_NORMAL, $arg );
    return;
}

# Prioritized sl().  This keeps the queue ordered by priority, low to
# high in the UNIX tradition.  It also throttles transmission
# following the hybrid ircd's algorithm, so you can't accidentally
# flood yourself off.  Thanks to Raistlin for explaining how ircd
# throttles messages.
sub sl_prioritized {
    my ($kernel, $self, $priority, @args) = @_[KERNEL, OBJECT, ARG0, ARG1];

    if (my ($event) = $args[0] =~ /^(\w+)/ ) {
        # Let the plugin system process this
        return 1 if $self->send_user_event($event, \@args) == PCI_EAT_ALL;
    }
    else {
        warn "Unable to extract the event name from '$args[0]'\n";
    }

    my $msg = $args[0];
    my $now = time();
    $self->{send_time} = $now if $self->{send_time} < $now;

    # if we find a newline in the message, take that to be the end of it
    $msg =~ s/[\015\012].*//s;

    if (bytes::length($msg) > $self->{msg_length} - bytes::length($self->nick_name())) {
        $msg = bytes::substr($msg, 0, $self->{msg_length} - bytes::length($self->nick_name()));
    }

    if (@{ $self->{send_queue} }) {
        my $i = @{ $self->{send_queue} };
        $i-- while ($i && $priority < $self->{send_queue}->[$i-1]->[MSG_PRI]);
        splice( @{ $self->{send_queue} }, $i, 0, [ $priority, $msg ] );
    }
    elsif ( !$self->{flood} && $self->{send_time} - $now >= 10
        || !defined $self->{socket} ) {
        push( @{$self->{send_queue}}, [ $priority, $msg ] );
        $kernel->delay( sl_delayed => $self->{send_time} - $now - 10 );
    }
    else {
        warn ">>> $msg\n" if $self->{debug};
        $self->send_event(irc_raw_out => $msg) if $self->{raw};
        $self->{send_time} += 2 + length($msg) / 120;
        $self->{socket}->put($msg);
    }

    return;
}

# Send delayed lines to the ircd.  We manage a virtual "send time"
# that progresses into the future based on hybrid ircd's rules every
# time a message is sent.  Once we find it ten or more seconds into
# the future, we wait for the realtime clock to catch up.
sub sl_delayed {
    my ($kernel, $self) = @_[KERNEL, OBJECT];

    return if !defined $self->{socket};

    my $now = time();
    $self->{send_time} = $now if $self->{send_time} < $now;

    while (@{ $self->{send_queue} } && ($self->{send_time} - $now < 10)) {
        my $arg = (shift @{$self->{send_queue}})->[MSG_TEXT];
        warn ">>> $arg\n" if $self->{debug};
        $self->send_event(irc_raw_out => $arg) if $self->{raw};
        $self->{send_time} += 2 + length($arg) / 120;
        $self->{socket}->put($arg);
    }

    if (@{ $self->{send_queue} }) {
        $kernel->delay( sl_delayed => $self->{send_time} - $now - 10 );
    }

    return;
}

# The handler for commands which have N arguments, separated by spaces.
sub spacesep {
    my ($kernel, $state) = @_[KERNEL, STATE];
    my $args = join ' ', @_[ARG0 .. $#_];
    my $pri = $_[OBJECT]->{IRC_CMDS}->{$state}->[CMD_PRI];

    $state = uc $state;
    $state .= " $args" if defined $args;
    $kernel->yield(sl_prioritized => $pri, $state );
    return;
}

# Set or query the current topic on a channel.
sub topic {
    my ($kernel, $chan, @args) = @_[KERNEL, ARG0..$#_];
    my $topic;
    $topic = join '', @args if @args;

    if (defined $topic) {
        $chan .= " :";
        $chan .= $topic if length $topic;
    }

    $kernel->yield(sl_prioritized => PRI_NORMAL, "TOPIC $chan");
    return;
}

# Asks the IRC server for some random information about particular nicks.
sub userhost {
    my ($kernel, @nicks) = @_[KERNEL, ARG0 .. $#_];

    if (!@nicks) {
        warn "The 'userhost' event requires at least one nickname\n";
        return;
    }

    # According to the RFC, you can only send 5 nicks at a time.
    while (@nicks) {
        $kernel->yield(
            'sl_prioritized',
            PRI_HIGH,
            'USERHOST ' . join(' ', splice(@nicks, 0, 5)),
        );
    }

    return;
}

# Non-event methods

sub server {
    my ($self) = @_;
    return $self->{server};
}

sub port {
    my ($self) = @_;
    return $self->{port};
}

sub server_name {
    my ($self) = @_;
    return $self->{INFO}{ServerName};
}

sub server_version {
    my ($self) = @_;
    return $self->{INFO}{ServerVersion};
}

sub localaddr {
    my ($self) = @_;
    return $self->{localaddr};
}

sub nick_name {
    my ($self) = @_;
    return $self->{INFO}{RealNick};
}

sub send_queue {
    my ($self) = @_;

    if (defined $self->{send_queue} && ref $self->{send_queue} eq 'ARRAY' ) {
        return scalar @{ $self->{send_queue} };
    }
    return;
}

sub raw_events {
    my ($self, $value) = @_;
    return $self->{raw} if !defined $value;
    $self->{raw} = $value;
    return;
}

sub connected {
    my ($self) = @_;
    return $self->{connected};
}

sub logged_in {
    my ($self) = @_;
    return 1 if $self->{INFO}{LoggedIn};
    return;
}

sub _compress_uplink {
    my ($self, $value) = @_;

    return if !$GOT_ZLIB;
    return $self->{uplink} if !defined $value;

    if ($value) {
        $self->{out_filter}->unshift( POE::Filter::Zlib::Stream->new() ) if !$self->{uplink};
        $self->{uplink} = 1;
    }
    else {
        $self->{out_filter}->shift() if $self->{uplink};
        $self->{uplink} = 0;
    }

    return $self->{uplink};
}

sub _compress_downlink {
    my ($self, $value) = @_;

    return if !$GOT_ZLIB;
    return $self->{downlink} if !defined $value;

    if ($value) {
        $self->{srv_filter}->unshift( POE::Filter::Zlib::Stream->new() ) if !$self->{downlink};
        $self->{downlink} = 1;
    }
    else {
        $self->{srv_filter}->shift() if $self->{uplink};
        $self->{downlink} = 0;
    }

    return $self->{downlink};
}

sub S_001 {
    my ($self, $irc) = splice @_, 0, 2;
    $self->{INFO}{ServerName} = ${ $_[0] };
    $self->{INFO}{LoggedIn}   = 1;
    return PCI_EAT_NONE;
}

sub S_004 {
    my ($self, $irc) = splice @_, 0, 2;
    my $args = ${ $_[2] };
    $self->{INFO}{ServerVersion} = $args->[1];
    return PCI_EAT_NONE;
}

sub S_error {
    my ($self, $irc) = splice @_, 0, 2;
    $self->{INFO}{LoggedIn} = 0;
    return PCI_EAT_NONE;
}

sub S_disconnected {
    my ($self, $irc) = splice @_, 0, 2;
    $self->{INFO}{LoggedIn} = 0;

    if ($self->{_waiting}) {
        $poe_kernel->delay('_quit_timeout');
        delete $self->{_waiting};
    }

    $self->_shutdown() if $self->{_shutdown};
    return PCI_EAT_NONE;
}

sub S_shutdown {
    my ($self, $irc) = splice @_, 0, 2;
    $self->{INFO}{LoggedIn} = 0;
    return PCI_EAT_NONE;
}

# Automatically replies to a PING from the server. Do not confuse this
# with CTCP PINGs, which are a wholly different animal that evolved
# much later on the technological timeline.
sub S_ping {
    my ($self, $irc) = splice @_, 0, 2;
    my $arg = ${ $_[0] };
    $irc->yield(sl_login => "PONG :$arg");
    return PCI_EAT_NONE;
}

# NICK messages for the purposes of determining our current nickname
sub S_nick {
    my ($self, $irc) = splice @_, 0, 2;
    my $nick = ( split /!/, ${ $_[0] } )[0];
    my $new = ${ $_[1] };
    $self->{INFO}{RealNick} = $new if ( $nick eq $self->{INFO}{RealNick} );
    return PCI_EAT_NONE;
}

# tell POE::Filter::IRC::Compat to handle IDENTIFY-MSG
sub S_290 {
    my ($self, $irc) = splice @_, 0, 2;
    my $text = ${ $_[1] };
    $self->{ircd_compat}->identifymsg(1) if $text eq 'IDENTIFY-MSG';
    return PCI_EAT_NONE;
}

sub S_cap {
    my ($self, $irc) = splice @_, 0, 2;
    my $cmd = ${ $_[0] };

    if ($cmd eq 'ACK') {
        my $list = ${ $_[1] } eq '*' ? ${ $_[2] } : ${ $_[1] };
        my @enabled = split / /, $list;

        if (grep { $_ =~ /^=?identify-msg$/ } @enabled) {
            $self->{ircd_compat}->identifymsg(1);
        }
        if (grep { $_ =~ /^-identify-msg$/ } @enabled) {
            $self->{ircd_compat}->identifymsg(0);
        }
    }
    return PCI_EAT_NONE;
}

sub S_isupport {
    my ($self, $irc) = splice @_, 0, 2;
    my $isupport = ${ $_[0] };
    $self->{ircd_compat}->chantypes( $isupport->isupport('CHANTYPES') || [ '#', '&' ] );
    $irc->yield(sl_login => 'CAPAB IDENTIFY-MSG') if $isupport->isupport('CAPAB');
    return PCI_EAT_NONE;
}

# accesses the ISupport plugin
sub isupport {
    my ($self, @args) = @_;
    return $self->{isupport}->isupport(@args);
}

sub isupport_dump_keys {
    return $_[0]->{isupport}->isupport_dump_keys();
}

sub resolver {
    return $_[0]->{resolver};
}

sub _ip_get_version {
    my ($ip) = @_;
    return if !defined $ip;

    # If the address does not contain any ':', maybe it's IPv4
    return 4 if $ip !~ /:/ && _ip_is_ipv4($ip);

    # Is it IPv6 ?
    return 6 if _ip_is_ipv6($ip);

    return;
}

sub _ip_is_ipv4 {
    my ($ip) = @_;
    return if !defined $ip;

    # Check for invalid chars
    return if $ip !~ /^[\d\.]+$/;
    return if $ip =~ /^\./;
    return if $ip =~ /\.$/;

    # Single Numbers are considered to be IPv4
    return 1 if $ip =~ /^(\d+)$/ && $1 < 256;

    # Count quads
    my $n = ($ip =~ tr/\./\./);

    # IPv4 must have from 1 to 4 quads
    return if $n <= 0 || $n > 4;

    # Check for empty quads
    return if $ip =~ /\.\./;

    for my $quad (split /\./, $ip) {
        # Check for invalid quads
        return if $quad < 0 || $quad >= 256;
    }
    return 1;
}

sub _ip_is_ipv6 {
    my ($ip) = @_;
    return if !defined $ip;

    # Count octets
    my $n = ($ip =~ tr/:/:/);
    return if ($n <= 0 || $n >= 8);

    # $k is a counter
    my $k;

    for my $octet (split /:/, $ip) {
        $k++;

        # Empty octet ?
        next if $octet eq '';

        # Normal v6 octet ?
        next if $octet =~ /^[a-f\d]{1,4}$/i;

        # Last octet - is it IPv4 ?
        if ($k == $n + 1) {
            next if (ip_is_ipv4($octet));
        }

        return;
    }

    # Does the IP address start with : ?
    return if $ip =~ m/^:[^:]/;

    # Does the IP address finish with : ?
    return if $ip =~ m/[^:]:$/;

    # Does the IP address have more than one '::' pattern ?
    return if $ip =~ s/:(?=:)//g > 1;

    return 1;
}

1;