NAME

Catalyst::Plugin::Session::PerUser - Per user sessions (instead of per browser sessions).

SYNOPSIS

        use Catalyst qw/
                Session
                Authentication
                Authentication::Store::Foo
                Session::PerUser
        /;

        sub action : Local {
                my ( $self, $c ) = @_;
                $c->user_session->{foo} = "bar";
        }

DESCRIPTION

This plugin allows you to write e.g. shopping cart code which should behave well for guests as well as permanent users.

The basic idea is both logged in and not logged in users can get the same benefits from sessions where it doesn't matter, but that logged in users can keep their sessions accross logins, and will even get the data they added/changed assimilated to their permanent account if they made the changes as guests and then logged in.

This is probably most useful for e-commerce sites, where the shopping cart is typically used before login, and should be equally accessible to both guests and logged in users.

STORING SESSION DATA

This module can store session data in two ways:

Within the User

If <$c-user->supports("session_data")>> then <$c-user->session_data>> is used as an accessor to store the per-user session hash reference.

This is useful for Catalyst::Plugin::Authentication::Store implementations that rely on a database or another fast, extensible format.

Within the Session Store

If the user does not support the session_data feature, the Catalyst::Plugin::Session::Store plugin in use will be used to save the session data instead.

The session ID used to save this data is set by user_session_sid.

Note that this method could potentially have security issues if you override the default user_session_sid or "validate_session_id" in Catalyst::Plugin::Session. See "CAVEATS" for details.

METHODS

user_session

If no user is logged in, returns <$c-session>>.

If a user is logged in, and <$user-supports("session_data")>> it will return <$c-user->session_data>>. Otherwise it will return <$c-user_session_from_session_store>>.

INTERNAL METHODS

merge_session_to_user

Uses Hash::Merge with the RETAINMENT_PRECEDENT and no cloning mode, omitting the special keys from session itself.

Should be overloaded to e.g. merge shopping cart items more smartly.

get_user_session_from_session_store

Uses the Catalyst::Plugin::Session::Store api to get a session data chunk whose session ID is user_session_sid.

store_user_session_in_session_store

Stores the session data cached by user_session_from_session_store.

user_session_sid

Returns

        "user:" . $c->user->id

EXTENDED METHODS

set_authenticated

Calls merge_session_to_user

CONFIGURATION

        $c->config->{user_session};

migrate

Whether $c->session should be merged over $c->user_session on login. On by default.

CAVEATS

If you override "validate_session_id" in Catalyst::Plugin::Session make sure it's format DOES NOT ALLOW the format returned by user_session_sid, or malicious users could potentially set their cookies to have sessions formatted like a string returned by user_session_sid, and steal or destroy another user's session without authenticating. =back

SEE ALSO

Catalyst::Plugin::Authentication, Catalyst::Plugin::Session

AUTHORS

David Kamholz, dkamholz@cpan.org

Yuval Kogman, nothingmuch@woobling.org

COPYRIGHT & LICNESE

        Copyright (c) 2005 the aforementioned authors. All rights
        reserved. This program is free software; you can redistribute
        it and/or modify it under the same terms as Perl itself.