WS-Security Username Tokens in Groovy

The  simplest of WS-Security tokens:  just send a username and password in the SOAP header. Ignoring the usual arguments about how insecure this might be, there are a number of systems that actually utitlise this and if you are using groovy-wslite, you might need to add it. The following code snippet generates the appropriate XML fix can be placed in the header.

If you place this in a seperate closure, the just call it from your message closure as using mkp.yieldUnescaped.