Interface TokenService

  • All Known Implementing Classes:

    public interface TokenService
    Provides a mechanism to allocate and rebuild secure, randomised tokens.

    Implementations are solely concern with issuing a new Token on demand. The issued Token may contain user-specified extended information. The token also contains a cryptographically strong, byte array-based key. This permits the token to be used to identify a user session, if desired. The key can subsequently be re-presented to the TokenService for verification and reconstruction of a Token equal to the original Token.

    Given the tightly-focused behaviour provided by this interface, it can serve as a building block for more sophisticated token-based solutions. For example, authentication systems that depend on stateless session keys. These could, for instance, place the username inside the user-specified extended information associated with the key). It is important to recognise that we do not intend for this interface to be expanded to provide such capabilities directly.

    • Method Detail

      • allocateToken

        Token allocateToken​(java.lang.String extendedInformation)
        Forces the allocation of a new Token.
        extendedInformation - the extended information desired in the token (cannot be null, but can be empty)
        a new token that has not been issued previously, and is guaranteed to be recognised by this implementation's verifyToken(String) at any future time.
      • verifyToken

        Token verifyToken​(java.lang.String key)
        Permits verification the Token.getKey() was issued by this TokenService and reconstructs the corresponding Token.
        key - as obtained from Token.getKey() and created by this implementation
        the token, or null if the token was not issued by this TokenService