POE::Component::Jabber - A POE Component for communicating over Jabber
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README

NAME
    POE::Component::Jabber - A POE Component for communicating over Jabber

VERSION
    3.00

DESCRIPTION
    PCJ is a communications component that fits within the POE framework and
    provides the raw low level footwork of initiating a connection,
    negotiatating various protocol layers, and authentication necessary for
    the end developer to focus more on the business end of implementing a
    client or service.

METHODS
    new()
        Accepts many named, required arguments which are listed below. new()
        will return a reference to the newly created reference to a PCJ
        object and should be stored. There are many useful methods that can
        be called on the object to gather various bits of information such
        as your negotiated JID.

        IP
          The IP address in dotted quad, or the FQDN for the server.

        PORT
          The remote port of the server to connect.

        HOSTNAME
          The hostname of the server. Used in addressing.

        USERNAME
          The username to be used in authentication (OPTIONAL for jabberd14
          service connections).

        PASSWORD
          The password to be used in authentication.

        RESOURCE
          The resource that will be used for binding and session
          establishment (OPTIONAL: resources aren't necessary for
          initialization of service oriented connections, and if not
          provided for client connections will be automagically generated).

        ALIAS
          The alias the component should register for use within POE.
          Defaults to the class name.

        CONNECTIONTYPE
          This is the type of connection you wish to esablish. There four
          possible types available for use. One must be selected. Each item
          is exported by default.

          XMPP (XMPP.pm)
            This connection type is for use with XMPP 1.0 compliant servers.
            It implements all of the necessary functionality for TLS,
            binding, and session negotiation.

          LEGACY (Legacy.pm)
            LEGACY is for use with pre-XMPP Jabber servers. It uses the old
            style authentication and non-secured socket communication.

          JABBERD14_COMPONENT (J14.pm)
            Use this connection type if designing a backbone level component
            for a server that implements XEP-114 for router level
            communication.

          JABBERD20_COMPONENT (J2.pm)
            If making a router level connection to the jabberd2 server, use
            this connection type. It implements the modified XMPP protocol,
            which does most of it except the session negotiation.

          Each connection type has a corresponding module. See their
          respective documentation for more information each protocol
          dialect.

        VERSION
          If for whatever reason you want to override the protocol version
          gathered from your ConnectionType, this is the place to do it.
          Please understand that this value SHOULD NOT be altered, but it is
          documented here just in case.

        XMLNS
          If for whatever reason you want to override the protocol's default
          XML namespace that is gathered from your ConnectionType, use this
          variable. Please understand that this value SHOULD NOT be altered,
          but is documented here just in case.

        STREAM
          If for whatever reason you want to override the xmlns:stream
          attribute in the <stream:stream/> this is the argument to use.
          This SHOULD NOT ever need to be altered, but it is available and
          documented just in case.

        DEBUG
          If bool true, will enable debugging and tracing within the
          component. All XML sent or received through the component will be
          printed to STDERR

    wheel() [Protected]
        wheel() returns the currently stored POE::Wheel reference. If
        provided an argument, that argument will replace the current
        POE::Wheel stored.

    sock() [Protected]
        sock() returns the current socket being used for communication. If
        provided an argument, that argument will replace the current socket
        stored.

    sid() [Protected]
        sid() returns the session ID that was given by the server upon the
        initial connection. If provided an argument, that argument will
        replace the current session id stored.

    config() [Protected]
        config() returns the configuration structure (HASH reference) of PCJ
        that is used internally. It contains values that are either defaults
        or were calculated based on arguments provided in the constructor.
        If provided an argument, that argument will replace the current
        configuration.

    pending() [Protected]
        pending() returns a hash reference to the currently pending
        return_to_sender transactions keyed by the 'id' attribute of the XML
        node. If provided an argument, that argument will replace the
        pending queue.

    queue() [Protected]
        queue() returns an array reference containing the Nodes sent when
        there was no suitable initialized connection available. Index zero
        is the first Node placed into the queue with index one being the
        second, and so on. See under the EVENTS section, 'purge_queue' for
        more information.

    _reset() [Private]
        _reset() returns PCJ back to its initial state and returns nothing.

    _gather_options() [Private]
        _gather_options() takes an array reference of the arguments provided
        to new() (ie. \@_) and populates its internal configuration with the
        values (the same configuration returned by config()).

    relinquish_states() [Protected]
        relinquish_states() is used by Protocol subclasses to return control
        of the events back to the core of PCJ. It is typically called when
        the event PCJ_READY is fired to the events handler.

PUBLISHED INPUT EVENTS
    'output'
        This is the event that you use to push data over the wire. It
        accepts only one argument, a reference to a POE::Filter::XML::Node.

    'return_to_sender'
        This event takes (1) a POE::Filter::XML::Node and gives it a unique
        id, and (2) a return event and places it in the state machine. Upon
        receipt of response to the request, the return event is fired with
        the response packet.

        POE::Component::Jabber will publish the return event upon receipt,
        and rescind the event once the the return event is fired.

        In the context POE::Component::PubSub, this means that a
        subscription must exist to the return event. Subscriptions can be
        made prior to publishing.

        Please note that return_to_sender short circuits before XPATH filter
        and normal node received events.

    'xpath_filter'
        This event takes (1) a command of either 'add' or 'remove', (2) and
        event name to be called upon a successful match, and (3) an XPATH
        expression.

        With 'add', all three arguments are required. With 'remove', only
        the event name is required.

        Like return_to_sender, POE::Component::Jabber will publish the
        return event upon receipt, but will NOT rescind once the filter
        matches something. This allows for persistent filters and event
        dispatching.

        Every filter is evaluated for every packet (if not applicable to
        return_to_sender processing), allowing multiple overlapping filters.
        And event names are not checked to be unique, so be careful when
        adding filters that go to the same event, because 'remove' will
        remove all instances of that particular event.

    'shutdown'
        The shutdown event terminates the XML stream which in turn will
        trigger the end of the socket's life.

    'connect' and 'reconnect'
        This event can take (1) the ip address of a new server and (2) the
        port. This event may also be called without any arguments and it
        will force the component to [re]connect.

        This event must be posted before the component will initiate a
        connection.

    'purge_queue'
        If Nodes are sent to the output event when there isn't a fully
        initialized connection, the Nodes are placed into a queue. PCJ will
        not automatically purge this queue when a suitable connection DOES
        become available because there is no way to tell if the packets are
        still valid or not. It is up to the end developer to decide this and
        fire this event. Packets will be sent in the order in which they
        were received.

PUBLISHED OUTPUT EVENTS
    Please see POE::Component::Jabber::Events for a list of published events
    to which subscriptions can be made.

CHANGES
    From the 2.X branch, several changes have been made improve event
    management.

    The guts are now based around POE::Component::PubSub. This enables very
    specific subscriptions to status events rather than all of the status
    events being delivered to a single event.

    Also, using the new POE::Filter::XML means that the underlying XML
    parser and Node implementation has changed for the better but also
    introduced API incompatibilities. For the most part, a simple
    search-and-replace will suffice. Well worth it for the power to apply
    XPATH expressions to nodes.

NOTES
    This is a connection broker. This should not be considered a first class
    client or service. This broker basically implements whatever core
    functionality is required to get the end developer to the point of
    writing upper level functionality quickly.

EXAMPLES
    For example implementations using all four current aspects, please see
    the examples/ directory in the distribution.

AUTHOR
    Copyright (c) 2003-2009 Nicholas Perez. Distributed under the GPL.