This post is on little tool mimeswacurl for sending an arbitrary file as attachment of a SOAP with Attachments file to a service endpoint.
This is really useful if developing a DataPower service dealing with SOAP with Attachments.

On DataPower the so called attachment-manifest gives details of the SOAP document as well as all atachments.

Stylesheet manifest.xsl which just outputs var://local/attachment-manifest for demo application below:

$ cat manifest.xsl
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:dp="http://www.datapower.com/extensions"
  extension-element-prefixes="dp"
>
  <xsl:output omit-xml-declaration="yes" />
    
  <xsl:template match="/">
    <xsl:copy-of select="dp:variable('var://local/attachment-manifest')" />
  </xsl:template>
  
</xsl:stylesheet>
$

On DataPower box dp3-l3 port 2051 there is a simple loopback XML FW:

Request Type: SOAP
Request Attachments: Allow
match all
transform action with manifest.xsl
Strip Attachments action removing all attachments

mimeswacurl tool just

creates a dummy SOAP document
attaches first argument file as binary attachment
sets Content-Type of the attachment in case of known MIME type, otherwise application/octet-stream
and sends this SOAP with Attachments file with tool curl to 2nd argument service endpoint

What you can see here is the output of attachment-manifest extraction service described above pretty printed by tidy tool:

$ mimeswacurl xslt.pdf http://dp3-l3:2051 | tidy -q -xml
<manifest>
  <package-headers />
  <root-headers>
    <header>
      <name>Content-Type</name>
      <value>application/soap+xml</value>
    </header>
    <header>
      <name>Content-Location</name>
      <value>root</value>
    </header>
  </root-headers>
  <media-type>
    <value>multipart/related; boundary="epoch-1299951959";
    type="text/xml"</value>
    <type>multipart</type>
    <sub-type>related</sub-type>
  </media-type>
  <attachments>
    <attachment>
      <uri>cid:binary</uri>
      <size>61806</size>
      <header>
        <name>Content-Type</name>
        <value>application/pdf</value>
      </header>
      <header>
        <name>Content-Transfer-Encoding</name>
        <value>binary</value>
      </header>
      <header>
        <name>Content-Id</name>
        <value><binary></value>
      </header>
    </attachment>
  </attachments>
</manifest>
 
$

As promised the Content-Type of attachment cid:binary (which is xslt.pdf) is application/pdf.

And this is the little Java application for detecting the MIME type:

$ cat MimeType.java 
import java.net.FileNameMap;
import java.net.URLConnection;
 
public class MimeType {
  public static void main(String args[]) throws Exception {

    String mimetype = URLConnection.getFileNameMap().getContentTypeFor(args[0]);
 
    System.out.println( (mimetype!=null) ? mimetype : "application/octet-stream" );
  }
}
$

Last, but not least, this is mimeswacurl tool -- a shell script working under Linux or Cygwin on Windows systems:

$ cat mimeswacurl 
#!/bin/bash
 
boundary=epoch-`date +%s`
 
echo "--$boundary 
Content-Type: application/soap+xml
Content-Location: root
 
<env:Envelope xmlns:env=\"http://schemas.xmlsoap.org/soap/envelope/\">
<env:Body>
<some_soap/>
</env:Body>

</env:Envelope>
--$boundary
Content-Type: `java -classpath ~/bin MimeType $1`
Content-Transfer-Encoding: binary
Content-Id: <binary>
 
" `cat $1` "
--$boundary--
" | curl -s --data-binary @- -H 'Content-Type: multipart/related; type="text/xml"; boundary="'$boundary'"' $2
 
$

For download:
manifest.xsl
mimeswacurl
MimeType.java

Hermann.