Re: newbie: p:http-request/SOAP

Pierre LINDENBAUM <plindenbaum@yahoo.fr> writes:
> I'm a new with XPROC. I'm currently tryinhg to send a SOAP request
> to a server using a p:http-request with a custom c:header It worked
> fine when the message was inline:
>
> <p:http-request>
>   <p:input port="source">
>     <p:inline>
>       <c:request method="POST" href="http://example.com" >
>         <c:header name="Soapaction" value="http://example.com"/>
>         <c:body content-type="application/xml">
>           <soap:Envelope>(...)</soap:Envelope>
>         </c:body>
>       </c:request>
>     </p:inline>
>   </p:input>
> </p:http-request>
>
> But, now, I would like to send a custom XML document that was build
> elsewhere in the pipeline. How can I achieve this ?

There are a couple of ways. Neither is what you'd call beautiful.
Inserting content into the middle of an XML document turns out to be a
little tricky.

One way is with XSLT:

<p:pipeline xmlns:p="http://www.w3.org/ns/xproc"
	    xmlns:c="http://www.w3.org/ns/xproc-step">

<p:xslt>
  <p:input port="source">
    <p:inline>
      <c:request method="POST" href="http://example.com" >
	<c:header name="Soapaction" value="http://example.com"/>
	<c:body content-type="application/xml"/>
      </c:request>
    </p:inline>
  </p:input>
  <p:input port="stylesheet">
    <p:inline>
      <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
		      version="2.0">
	<xsl:output method="xml" encoding="utf-8" indent="no"
		    omit-xml-declaration="yes"/>
	<xsl:preserve-space elements="*"/>
	<xsl:template match="/">
	  <xsl:apply-templates/>
	</xsl:template>
	<xsl:template match="c:body">
	  <xsl:copy>
	    <xsl:copy-of select="@*"/>
	    <xsl:copy-of select="doc('soap.xml')"/>
	  </xsl:copy>
	</xsl:template>
	<xsl:template match="*">
	  <xsl:copy>
	    <xsl:copy-of select="@*"/>
	    <xsl:apply-templates/>
	  </xsl:copy>
	</xsl:template>
	<xsl:template match="comment()|processing-instruction()|text()">
	  <xsl:copy/>
	</xsl:template>
      </xsl:stylesheet>
    </p:inline>
  </p:input>
</p:xslt>

<p:http-request/>

</p:pipeline>

Another, and one that will be easier if you want to make the name of
the file that contains the payload dynamic, is to use a combination of
wrap-sequence and set-attributes:

<p:pipeline xmlns:p="http://www.w3.org/ns/xproc"
	    xmlns:c="http://www.w3.org/ns/xproc-step">

<p:identity name="headers">
  <p:input port="source">
    <p:inline>
      <c:header name="Soapaction" value="http://example.com"/>
    </p:inline>
    <p:inline>
      <c:header name="Otherheader" value="otherValue"/>
    </p:inline>
  </p:input>
</p:identity>

<p:load name="payload" href="soap.xml"/>

<p:wrap-sequence wrapper="c:request">
  <p:input port="source">
    <p:pipe step="headers" port="result"/>
    <p:pipe step="payload" port="result"/>
  </p:input>
</p:wrap-sequence>

<p:set-attributes match="/c:request">
  <p:input port="attributes">
    <p:inline>
      <irrelevantElementName method="POST" href="http://example.com"/>
    </p:inline>
  </p:input>
</p:set-attributes>

<p:http-request/>

</p:pipeline>

I hope that helps.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | 5% of the world's population consumes a
http://nwalsh.com/            | third of its resources and makes nearly
                              | half its waste. That 5% is US.