NAME Catalyst::Plugin::Session::State::URI - Saves session IDs by rewriting URIs delivered to the client, and extracting the session ID from requested URIs. SYNOPSIS use Catalyst qw/Session Session::State::URI Session::Store::Foo/; # If you want the param style rewriting, set the parameter MyApp->config->{session} = { param => 'sessionid', # or whatever you like }; DESCRIPTION In order for Catalyst::Plugin::Session to work the session ID needs to be stored on the client, and the session data needs to be stored on the server. This plugin cheats and instead of storing the session id on the client, it simply embeds the session id into every URI sent to the user. METHODS session_should_rewrite This method is consulted by "finalize". The body will be rewritten only if it returns a true value. It will read "$c->config->{session}{rewrite}" which will be set 1 at first if not defined. In the future this may be conditional based on the type of the body, or other factors. And it's separate so that you can overload it. session_should_rewrite_uri $uri_text This method is to determine whether a URI should be rewritten. It will return true for URIs under "$c->req->base", and it will also use MIME::Types to filter the links which point to png, pdf and etc with the file extension. uri_with_sessionid $uri_text By path style rewriting, it will appends "/-/$sessionid" to the uri path. http://myapp/link -> http://myapp/link/-/$sessionid By param style rewriting, it will add a parameter key/value pair after the uri path. http://myapp/link -> http://myapp/link?$param=$sessionid EXTENDED METHODS prepare_action Will restore the session if the request URI is formatted accordingly, and rewrite the URI to remove the additional part. finalize If "session_should_rewrite" returns a true value, HTML::TokePaser::Simple is used to traverse the body to replace all URLs which get true returned by "session_should_rewrite_uri" so that they contain the session ID. CAVEATS Session Hijacking URI sessions are very prone to session hijacking problems. Make sure your users know not to copy and paste URIs to prevent these problems, and always provide a way to safely link to public resources. Also make sure to never link to external sites without going through a gateway page that does not have session data in it's URI, so that the external site doesn't get any session IDs in the http referrer header. Due to these issues this plugin should be used as a last resort, as Catalyst::Plugin::Session::State::Cookie is more appropriate 99% of the time. Take a look at the IP address limiting features in Catalyst::Plugin::Session to see make some of these problems less dangerous. Goodbye page recipe To exclude some sections of your application, like a goodbye page (see "CAVEATS") you should make extend the "session_should_rewrite_uri" method to return true if the URI does not point to the goodbye page, extend "prepare_action" to not rewrite URIs that match "/-/" (so that external URIs with that in their path as a parameter to the goodbye page will not be destroyed) and finally extend "uri_with_sessionid" to rewrite URIs with the following logic: * URIs that match "/^$base/" are appended with session data ( "$c->NEXT::uri_with_sessionid"). * External URIs (everything else) should be prepended by the goodbye page. (e.g. "http://myapp/link/http://the_url_of_whatever/foo.html"). But note that this behavior will be problematic when you are e.g. submitting POSTs to forms on external sites. SEE ALSO Catalyst, Catalyst::Plugin::Session,Catalyst::Plugin::Session::FastMmap "HTML::TokeParser::Simple", "MIME::Types". AUTHORS This module is derived from Catalyst::Plugin::Session::FastMmap code, and has been heavily modified since. Andrew Ford Andy Grundman Christian Hansen Yuval Kogman, "nothingmuch@woobling.org" Marcus Ramberg Sebastian Riedel Hu Hailin COPYRIGHT This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.