NAME

        CGI::SSI - Use SSI from CGI scripts

SYNOPSIS

        # autotie STDOUT or any other open filehandle

          use CGI::SSI (autotie => 'STDOUT');

          print $shtml; # browser sees resulting HTML

        # or tie it yourself to any open filehandle

          use CGI::SSI;

          open(FILE,'+>'.$html_file) or die $!;
          $ssi = tie(*FILE, 'CGI::SSI', filehandle => 'FILE');
          print FILE $shtml; # HTML arrives in the file

        # or use the object-oriented interface

          use CGI::SSI;

          $ssi = CGI::SSI->new();

          $ssi->if('"$varname" =~ /^foo/');
             $html .= $ssi->process($shtml);
          $ssi->else();
             $html .= $ssi->include(file => $filename);
          $ssi->endif();

          print $ssi->exec(cgi => $url);
          print $ssi->flastmod(file => $filename);

        #
        # or roll your own favorite flavor of SSI
        #

          package CGI::SSI::MySSI;
          use CGI::SSI;
          @CGI::SSI::MySSI::ISA = qw(CGI::SSI);

          sub include {
             my($self,$type,$file_or_url) = @_;
             # my idea of include goes something like this...
             return $html;
          }
          1;
          __END__

        #
        # or use .htaccess to include all files in a dir
        #

          # in .htaccess
          Action cgi-ssi /cgi-bin/ssi/process.cgi
          <FilesMatch "\.shtml">
             SetHandler cgi-ssi
          </FilesMatch>

          # in /cgi-bin/ssi/process.cgi
          #!/usr/local/bin/perl
          use CGI::SSI;
          CGI::SSI->handler();
          __END__

DESCRIPTION

       CGI::SSI is meant to be used as an easy way to filter shtml through CGI scripts in a loose
       imitation of Apache's mod_include.  If you're using Apache, you may want to use either
       mod_include or the Apache::SSI module instead of CGI::SSI. Limitations in a CGI script's
       knowledge of how the server behaves make some SSI directives impossible to imitate from a
       CGI script.

       Most of the time, you'll simply want to filter shtml through STDOUT or some other open
       filehandle. "autotie" is available for STDOUT, but in general, you'll want to tie other
       filehandles yourself:

           $ssi = tie(*FH, 'CGI::SSI', filehandle => 'FH');
           print FH $shtml;

       Note that you'll need to pass the name of the filehandle to "tie()" as a named parameter.
       Other named parameters are possible, as detailed below. These parameters are the same as
       those passed to the "new()" method. However, "new()" will not tie a filehandle for you.

       CGI::SSI has it's own flavor of SSI. Test expressions are Perlish.  You may create and use
       multiple CGI::SSI objects; they will not step on each others' variables.

       Object-Oriented methods use the same general format so as to imitate SSI directives:

           <!--#include virtual="/foo/bar.footer" -->

         would be

           $ssi->include(virtual => '/foo/bar.footer');

       likewise,

           <!--#exec cgi="/cgi-bin/foo.cgi" -->

         would be

           $ssi->exec(cgi => '/cgi-bin/foo.cgi');

       Usually, if there's no chance for ambiguity, the first argument may be left out:

           <!--#echo var="var_name" -->

         could be either

           $ssi->echo(var => 'var_name');

         or

           $ssi->echo('var_name');

       Likewise,

           $ssi->set(var => $varname, value => $value)

         is the same as

           $ssi->set($varname => $value)

       $ssi->new([%args])
           Creates a new CGI::SSI object. The following are valid (optional) arguments:

            DOCUMENT_URI    => $doc_uri,
            DOCUMENT_NAME   => $doc_name,
            DOCUMENT_ROOT   => $doc_root,
            errmsg          => $oops,
            sizefmt         => ('bytes' || 'abbrev'),
            timefmt         => $time_fmt,
            MAX_RECURSIONS  => $default_100, # when to stop infinite loops w/ error msg
            COOKIE_JAR      => HTTP::Cookies->new,

       $ssi->config($type, $arg)
           $type is either 'sizefmt', 'timefmt', or 'errmsg'. $arg is similar to those of the SSI
           "spec", referenced below.

       $ssi->set($varname => $value)
           Sets variables internal to the CGI::SSI object. (Not to be confused with the normal
           variables your script uses!) These variables may be used in test expressions, and
           retreived using $ssi->echo($varname). These variables also will not be available in
           external, included resources.

       $ssi->echo($varname)
           Returns the value of the variable named $varname. Such variables may be set manually
           using the "set()" method. There are also several built-in variables:

            DOCUMENT_URI  - the URI of this document
            DOCUMENT_NAME - the name of the current document
            DATE_GMT      - the same as 'gmtime'
            DATE_LOCAL    - the same as 'localtime'
            LAST_MODIFIED - the last time this script was modified

       $ssi->exec($type, $arg)
           $type is either 'cmd' or 'cgi'. $arg is similar to the SSI "spec" (see below).

       $ssi->include($type, $arg)
           Similar to "exec", but "virtual" and "file" are the two valid types.  SSI variables
           will not be available outside of your CGI::SSI object, regardless of whether the
           virtual resource is on the local system or a remote system.

       $ssi->flastmod($type, $filename)
           Similar to "include".

       $ssi->fsize($type, $filename)
           Same as "flastmod".

       $ssi->printenv
           Returns the environment similar to Apache's mod_include.

       $ssi->cookie_jar([$jar])
           Returns the currently-used HTTP::Cookies object. You may optionally pass in a new
           HTTP::Cookies object. The jar is used for web requests in exec cgi and include virtual
           directives.

   FLOW-CONTROL METHODS
       The following methods may be used to test expressions. During a "block" where the test
       $expr is false, nothing will be returned (or printed, if tied).

       $ssi->if($expr)
           The expr can be anything Perl, but care should be taken. This causes problems:

            $ssi->set(varname => "foo");
            <!--#if expr="'\$varname' =~ /^foo$/" -->ok<!--#endif -->

           The $varname is expanded as you would expect. (We escape it so as to use the $varname
           within the CGI::SSI object, instead of that within our progam.) But the $/ inside the
           regex is also expanded. This is fixed by escaping the "$":

            <!--#if expr="'\$varname' =~ /^value\$/" -->ok<!--#endif -->

           The expressions used in if and elif tags/calls are tricky due to the number of escapes
           required. In some cases, you'll need to write "\\\\" to mean "\".

       $ssi->elif($expr)
       $ssi->else
       $ssi->endif

SEE ALSO

       "Apache::SSI" and the SSI "spec" at http://www.apache.org/docs/mod/mod_include.html

AUTHOR

       (c) 2000-2005 James Tolley <james@bitperfect.com> All Rights Reserved.

       This is free software. You may copy and/or modify it under the same terms as perl itself.

CREDITS

       Many Thanks to Corey Wilson and Fitz Elliot for bug reports and fixes.