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public class WSBasicAuthenticationServicePolicyInterceptor implements Interceptor {
    public static final QName policySetQName = new QName(Constants.SCA10_TUSCANY_NS, "wsBasicAuthentication");

    private Invoker next;
    private Operation operation;
    private PolicySet policySet = null;
    private String context;
    private WSBasicAuthenticationPolicy policy;

    public WSBasicAuthenticationServicePolicyInterceptor(String context, Operation operation, PolicySet policySet) {
        super();
        this.operation = operation;
        this.policySet = policySet;
        this.context = context;
        init();
    }

    private void init() {
        if (policySet != null) {
            for (Object policyObject : policySet.getPolicies()){
                if (policyObject instanceof WSBasicAuthenticationPolicy){
                    policy = (WSBasicAuthenticationPolicy)policyObject;
                    break;
                }
            }
        }
    }

    public Message invoke(Message msg) {
        Object[] header = msg.getHeader();
        
        Map httpHeaderProperties = (Map)Object[0];
        
        String basicAuthString = (String)httpHeaderProperties.get("Authorization");
        String decodedBasicAuthString = null;
        String username = null;
        String password = null;
        
        if (basicAuthString != null) {
            basicAuthString = basicAuthString.trim();
            
            if (basicAuthString.startsWith("Basic ")) {
                decodedBasicAuthString = new String(Base64.decode(basicAuthString.substring(6)));
            }
            
            int collonIndex = decodedBasicAuthString.indexOf(':');
            
            if (collonIndex == -1){
                username = decodedBasicAuthString;
            } else {
                username = decodedBasicAuthString.substring(0, collonIndex);
                password = decodedBasicAuthString.substring(collonIndex + 1);
            }
            
            // could call out here to some 3rd part system to do whatever you 
            // need to turn credentials into a principal
        String username = (String)msg.getQoSContext().get(WSBasicAuthenticationPolicy.WS_BASIC_AUTHENTICATION_USERNAME);
 a principal         String password = (String)msg.getQoSContext().get(WSBasicAuthenticationPolicy.WS_BASIC_AUTHENTICATION_PASSWORD);

            
            msg.getQoSContext().put(Message.QOS_CTX_SECURITY_PRINCIPAL, username);             
        }
    
        return getNext().invoke(msg);
    }

    public Invoker getNext() {
        return next;
    }

    public void setNext(Invoker next) {
        this.next = next;
    }
}