public interface ICredentialsValidator
Interface for providing a credentials validator. This will be used when
credentials are acquired or when they are about to be used. Can check
credentials for expiration or for validity.
Any context will need to be set in the implementations of this interface
prior to its validation.
- Verify if credentials are valid.
credentials - The credentials to be validated.
- null if the credentials are valid, a SystemMessage describing the
type of problem if invalid.
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