Persisted Grant Service

    /// <summary>
    /// Implements persisted grant logic
    /// </summary>
    public interface IPersistedGrantService
    {
        /// <summary>
        /// Gets all grants for a given subject ID.
        /// </summary>
        /// <param name="subjectId">The subject identifier.</param>
        /// <returns></returns>
        Task<IEnumerable<Grant>> GetAllGrantsAsync(string subjectId);

        /// <summary>
        /// Removes all grants for a given subject id, and optionally client id and session id combination.
        /// </summary>
        /// <param name="subjectId">The subject identifier.</param>
        /// <param name="clientId">The client identifier (optional).</param>
        /// <param name="sessionId">The session id (optional).</param>
        /// <returns></returns>
        Task RemoveAllGrantsAsync(string subjectId, string clientId = null, string sessionId = null);
    }

    /// <summary>
    /// Models a grant the user has given.
    /// </summary>
    public class Grant
    {
        /// <summary>
        /// Gets or sets the subject identifier.
        /// </summary>
        /// <value>
        /// The subject identifier.
        /// </value>
        public string SubjectId { get; set; }

        /// <summary>
        /// Gets or sets the client identifier.
        /// </summary>
        /// <value>
        /// The client identifier.
        /// </value>
        public string ClientId { get; set; }

        /// <summary>
        /// Gets the description the user assigned to the device being authorized.
        /// </summary>
        /// <value>
        /// The description.
        /// </value>
        public string Description { get; set; }

        /// <summary>
        /// Gets or sets the scopes.
        /// </summary>
        /// <value>
        /// The scopes.
        /// </value>
        public IEnumerable<string> Scopes { get; set; }

        /// <summary>
        /// Gets or sets the creation time.
        /// </summary>
        /// <value>
        /// The creation time.
        /// </value>
        public DateTime CreationTime { get; set; }

        /// <summary>
        /// Gets or sets the expiration.
        /// </summary>
        /// <value>
        /// The expiration.
        /// </value>
        public DateTime? Expiration { get; set; }
    }