How to get a data in xslt from the context variable which was set in javascript policy.

Google Cloud Apigee
1

How to get a data in xslt from the context variable which was set in javascript policy.

I have javascript policy which is modifying data and set to some context variable named (headers) then I have xslt policy .I need to use the data(headers)in xslt.

2

Can you clarify further?

What is contained within the context variable ā€œheadersā€?

When you say ā€œI need to use the data(headers) in xsltā€ā€¦ do you mean you wish to use the data as XSLT parameters? Or as the source (input) to the XSLT ?

Parameters

If you want to use the value of a context variable inside an XSL parameter, then the syntax is like this:

XSL policy:

<XSL name="XSL-XformRequest">
  <OutputVariable>request.content</OutputVariable>
  <Parameters ignoreUnresolvedVariables="true">
    <Parameter name="param1" ref="context-variable-goes-here"/>
    <Parameter name="param2" ref="another-context-variable-here"/>
  </Parameters>
  <ResourceURL>xsl://XformRequest.xsl</ResourceURL>
  <Source>request</Source>
</XSL>

and the XSL itself looks like:

<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
    >
  <xsl:param name="param1" select="''"/>
  <xsl:param name="param2" select="''"/>
  <xsl:output
      method="xml"
      omit-xml-declaration="yes"
      indent="no"
      media-type="string"/>
  ...

Source

If you want to use the context variable as an XML source for the XSLT, then you need to store it in the content of a Message. The XSL policy accepts a Source element, and the value of the Source element must be a variable name. The variable must be of type ā€œMessageā€. The body of the Message must be XML and the content-type must be application/xml. In JS, setting the appropriate Message looks like this:

  var bodyXml = '<root><child1/><child2/></root>'; 

  var req = new Request('http://foo/bar', // value does not matter
                'POST', 
                {'Content-Type':'application/xml'}, 
                bodyXml);
  context.setVariable('myRequest', myRequest);

ā€¦and then you would configure your XSL policy like this:

<XSL name="XSL-XformRequest">
  <OutputVariable>request.content</OutputVariable>
  <ResourceURL>xsl://XformRequest.xsl</ResourceURL>
  <Source>myRequest</Source>
</XSL>

ā€¦and the XSL can be whatever you like.

The actual values for the verb (ā€˜POSTā€™ in my example) and the URL (ā€˜http://foo/barā€™ in my example) donā€™t matter, for the purposes of the XSL. You just need the body content and the content-type.

On further consideration, I think the verb should not matter butā€¦ a body applies only to PUT or POST, so it is possible that one of those two verbs is required.