NAME

       Plack::Session::State - Basic parameter-based session state

SYNOPSIS

         use Plack::Builder;
         use Plack::Middleware::Session;
         use Plack::Session::State;

         my $app = sub {
             return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ];
         };

         builder {
             enable 'Session',
                 state => Plack::Session::State->new;
             $app;
         };

DESCRIPTION

       This will maintain session state by passing the session through the request params. It
       does not do this automatically though, you are responsible for passing the session param.

       This should be considered the state "base" class (although subclassing is not a
       requirement) and defines the spec for all Plack::Session::State::* modules. You will only
       need to override a couple methods if you do subclass. See Plack::Session::State::Cookie
       for an example of this.

       WARNING: parameter based session ID management makes session fixation really easy, and
       that makes your website vulnerable. You should really avoid using this state in the
       production environment except when you have to deal with legacy HTTP clients that do not
       support cookies.

       In the future this parameter based state handling will be removed from this base class and
       will be moved to its own State class.

METHODS

       new ( %params )
           The %params can include session_key, sid_generator and sid_checker however in both
           cases a default will be provided for you.

       session_key
           This is the name of the session key, it defaults to 'plack_session'.

       sid_generator
           This is a CODE ref used to generate unique session ids, by default it will generate a
           SHA1 using fairly sufficient entropy. If you are concerned or interested, just read
           the source.

       sid_validator
           This is a regex used to validate requested session id.

   Session ID Managment
       get_session_id ( $env )
           This is the method used to extract the session id from a $env.  Subclasses will often
           only need to override this method and the "finalize" method.

       validate_session_id ( $session_id )
           This will use the "sid_validator" regex and confirm that the $session_id is valid.

       extract ( $env )
           This will attempt to extract the session from a $env by looking for the "session_key"
           in the request params. It will then check to see if the session is valid and that it
           has not expired. It will return the session id if everything is good or undef
           otherwise.

       generate ( $request )
           This will generate a new session id using the "sid_generator" callback.  The $request
           argument is not used by this method but is there for use by subclasses. The $request
           is expected to be a Plack::Request instance or an object with an equivalent interface.

       finalize ( $session_id, $response )
           Given a $session_id and a $response this will perform any finalization necessary to
           preserve state. This method is called by the Plack::Session "finalize" method. The
           $response is expected to be a Plack::Response instance or an object with an equivalent
           interface.

   Session Expiration Handling
       expire_session_id ( $id, $response )
           This will mark the session for $id as expired. This method is called by the
           Plack::Session "expire" method.

BUGS

       All complex software has bugs lurking in it, and this module is no exception. If you find
       a bug please either email me, or add the bug to cpan-RT.

AUTHOR

       Stevan Little <stevan.little@iinteractive.com>

COPYRIGHT AND LICENSE

       Copyright 2009, 2010 Infinity Interactive, Inc.

       <http://www.iinteractive.com>

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.