Link Rewriting


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Link Rewriting

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JSP Tag Libraries with XTP

Rewriting links to encode sessions is a tedious and error-prone task. If you use URL-encoded sessions, every <a> link and every <form> action needs a rewritten link using response.encodeURL(). XTP can rewrite those for you automatically.

stylesheet.xsl

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

  <!-- make sure '<' is not printed as '&lt;' -->
  <xsl:output disable-output-escaping='true'/>

  <!-- copy input to output -->
  <xsl:template match='*|@*'>
    <xsl:copy>
      <xsl:apply-templates select='node()|@*'/>
    </xsl:copy>
  </xsl:template>

  <!-- rewrite <a href> -->
  <xsl:template match="a[@href]">
    <a href='<%= response.encodeURL("{@href}") %>'>
      <xsl:apply-templates select="node()|@*[name(.)!="href"]"/>
    </a>
  </xsl:template>
</xsl:stylesheet>

Your XTP page may look something like:

test.xtp
<?xml-stylesheet href='stylesheet.xsl'?> <h1>My test</h1> Adding: 2 + 2 = <%= 2 + 2 %> <p>New? <%= session.isNew() %> <p>And <a href='test.xtp'>linking</a>

The transformed file will look like:

<?xml-stylesheet href='stylesheet.xsl'?> <h1>My test</h1> Adding: 2 + 2 = <%= 2 + 2 %> <p>New? <%= session.isNew() %> <p>And <a href='<%= response.encodeURL("test.xtp") %>'>linking</a>

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