Rebecca Searls created CXF-5521:
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             Summary: Setting SecurityConstants.STS_TOKEN_ON_BEHALF_OF as 
CallbackHander requires better documentation.
                 Key: CXF-5521
                 URL: https://issues.apache.org/jira/browse/CXF-5521
             Project: CXF
          Issue Type: Improvement
          Components: Documentation
    Affects Versions: 2.7.8, 3.0.0-milestone1
            Reporter: Rebecca Searls



Using: cxf-tr-ws-security-2.7.8

The current documentation states that SecurityConstants.STS_TOKEN_ON_BEHALF_OF
declared with "a CallbackHandler object to use to obtain the token"

A very specific CallbackHandler implementation is required.  It MUST be
an implementation that supports processing DelegationCallback as input and
generating a org.w3c.dom.Element.
  
Existing examples are 
    org.apache.cxf.ws.security.trust.delegation.ReceivedTokenCallbackHandler 
    org.apache.cxf.ws.security.trust.delegation.WSSUsernameCallbackHandler
    

The code in org.apache.cxf.ws.security.trust.AbstractSTSClient requires this.

814     DelegationCallback callback = new DelegationCallback(message);
815     ((CallbackHandler)delegationObject).handle(new Callback[]{callback});
816     return callback.getToken();





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