gistfile1.txt

    public class LocalAuthenticationHandler : AuthenticationHandler<AuthenticationSchemeOptions>
    {
        /// <summary>
        /// The default user id, injected into the claims for all requests.
        /// </summary>
        public static readonly Guid UserId = Guid.Parse("687d7c63-9a15-4faf-af5a-140782baa24d");

        /// <summary>
        /// The name of the authorizaton scheme that this handler will respond to.
        /// </summary>
        public const string AuthScheme = "LocalAuth";

        private readonly Claim DefaultUserIdClaim = new Claim(
            UserIdClaimType, UserId.ToString());

        public LocalAuthenticationHandler(
            IOptionsMonitor<AuthenticationSchemeOptions> options, ILoggerFactory logger, 
            UrlEncoder encoder, ISystemClock clock) : base(options, logger, encoder, clock)
        {
        }

        /// <summary>
        /// Marks all authentication requests as successful, and injects the
        /// default company id into the user claims.
        /// </summary>
        protected override Task<AuthenticateResult> HandleAuthenticateAsync()
        {
            var authenticationTicket = new AuthenticationTicket(
                new ClaimsPrincipal(new ClaimsIdentity(new Claim[] { DefaultUserIdClaim }, AuthScheme)),
                new AuthenticationProperties(),
                AuthScheme);
            return Task.FromResult(AuthenticateResult.Success(authenticationTicket));
        }
    }