ANNOUNCE: CAP::LinkIntegrity 0.02

CGI::Application::Plugin::LinkIntegrity should be available soon on a
CPAN mirror near you:

    http://search.cpan.org/dist/CGI-Application-Plugin-LinkIntegrity-0.02/

Thank you to the cgiapp list for all your help answering my questions
about QUERY_STRINGs and whatnot.

Thanks especially to Richard Dice.  This module is based on a feature
from CAF that he wrote.


CAP::LinkIntegrity is a plugin that makes it easy to create
tamper-resistant URLs in your application.

Basically, it adds a crytpographic checksum to each link you generate:

    my $link = $self->make_link("/account.cgi?rm=balance&acct_id=73");
    print $link; # 
/account.cgi?rm=balance&acct_id=73&_checksum=1d7c4b82d075785de04fa6b98b572691

If the user attempts to change part of the URL (e.g. a query string
parameter, or the PATH_INFO), then the checksum will not match.  The run
mode will be changed to link_tampered, and the invalid_checksum
hook will be called.

You can define the 'link_tampered' run mode yourself, or you can use
the default 'link_tampered' run mode built into
'CGI::Application::Plugin::LinkIntegrity'.

You can disable link checking during development by passing a flag at
configuration time.

You can choose the module you want to use to generate the checksum (e.g.
Digest::MD5 or Digest::SHA1), or you can create your own subroutine to
do the work.


Michael



---
Michael Graham <magog@xxxxxxxxxxxx>


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