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Sun GlassFish Web Space Server 10.0 Secure Web Access Add-On Guide

Sample for JavaScript EXPRESSION Variables

ProcedureTo Use the JavaScript Expression Variables Sample

  1. This sample can be accessed from:

    portal-server-URL/rewriter/JavaScript/variables/expr/expr.html

  2. Add the rule specified in this sample (if it does not already exist) to the default_gateway_ruleset in the section "Rules for Rewriting JavaScript Source".

  3. Edit the default_gateway_ruleset in the Rewriter service under Portal Server Configuration in the Portal Server administration console.

  4. If you added the rule, restart the Gateway:


    ./psadmin start-sra-instance –u amadmin – f  <password file> –N <profile name>– t  <gateway>

HTML Page Before Rewriting

<html>
<head>
<title>JavaScript EXPRESSION Variables Test Page</title>
</head>
<body>
<script LANGUAGE="Javascript">
<!--
//Expression variables
var expvar1="images";
var expvar2="/logo.gif";
var expvar = expvar1 + expvar2;
document.write("<A HREF="+expvar+">EXPRESSION</A><P>")
var expvar="/images/logo"+".gif";
document.write("<A HREF="+expvar+">EXPRESSION</A><P>")
//-->
</SCRIPT>
Testing JavaScript EXPRESSION variables
</body>
</html>

Rule

<Variable type=”EXPRESSION” name="expvar"/>

HTML Page After Rewriting

<html>
<head>
<title>JavaScript EXPRESSION Variables Test Page</title>
</head>
<body>
<SCRIPT>
// Rewriter appends the wrapper function 
psSRAPRewriter_convert_expression here
</SCRIPT>
<script LANGUAGE="Javascript">
<!--
//Expression variables
var expvar1="images";
var expvar2="/logo.gif";
var expvar =psSRAPRewriter_convert_expression( expvar1 + expvar2);

// Rewriter recognizes the right hand side of this statement to be a JavaScript EXPRESSION variable. Rewriter is not able to resolve the value of this expression at the server end. Hence, the psSRAPRewriter_convert_expression function is prefixed to the expression. The expression is evaluated at the client end, and rewritten as required.

document.write("<A HREF="+expvar+">EXPRESSION</A><P>")

// The rewritten value of expvar from the previous statement is used to arrive at the value of this expression. Because the result is a valid URL (a graphic exists at this location in the sample), the link will work.

var expvar="gateway URL/portal-server-URL/images/logo"+".gif";

// Rewriter recognizes the right hand side of expvar to be a string expression. This can be resolved at the server side, and hence is rewritten directly.

document.write("<A HREF="+expvar+">EXPRESSION</A><P>")

// The rewritten value of expvar from the previous statement is used to arrive at the value of this expression. Because the result is a not a valid URL (a graphic does not exist at the resultant location), the link will not work.

//-->
</SCRIPT>
Testing JavaScript EXPRESSION variables
</body>
</html>