Callback handler that validates a password digest using an Acegi UserDetailsService. Logic based on
Acegi's DigestProcessingFilter.
An Acegi UserDetailService is used to load UserDetails from. The digest of the password
contained in this details object is then compared with the digest in the message.
This class only handles PasswordValidationCallbacks that contain a DigestPasswordRequest,
and throws an UnsupportedCallbackException for others.
UserDetailsService. Logic based on Acegi'sDigestProcessingFilter. An AcegiUserDetailServiceis used to loadUserDetailsfrom. The digest of the password contained in this details object is then compared with the digest in the message. This class only handlesPasswordValidationCallbacks that contain aDigestPasswordRequest, and throws anUnsupportedCallbackExceptionfor others.