public override Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context) { string clientId = string.Empty; string clientSecret = string.Empty; Client client = null; if (!context.TryGetBasicCredentials(out clientId, out clientSecret)) { context.TryGetFormCredentials(out clientId, out clientSecret); } if (context.ClientId == null) { //Remove the comments from the below line context.SetError, and invalidate context //if you want to force sending clientId/secrects once obtain access tokens. context.Validated(); //context.SetError("invalid_clientId", "ClientId should be sent."); return Task.FromResult<object>(null); } using (AccountRepository _repo = new AccountRepository(new MyRoomDbContext())) { client = _repo.FindClient(context.ClientId); } if (client == null) { context.SetError("invalid_clientId", string.Format("Client '{0}' is not registered in the system.", context.ClientId)); return Task.FromResult<object>(null); } if (client.ApplicationType == ApplicationTypes.NativeConfidential) { if (string.IsNullOrWhiteSpace(clientSecret)) { context.SetError("invalid_clientId", "Client secret should be sent."); return Task.FromResult<object>(null); } else { if (client.Secret != Helper.GetHash(clientSecret)) { context.SetError("invalid_clientId", "Client secret is invalid."); return Task.FromResult<object>(null); } } } if (!client.Active) { context.SetError("invalid_clientId", "Client is inactive."); return Task.FromResult<object>(null); } context.OwinContext.Set<string>("as:clientAllowedOrigin", client.AllowedOrigin); context.OwinContext.Set<string>("as:clientRefreshTokenLifeTime", client.RefreshTokenLifeTime.ToString()); context.Validated(); return Task.FromResult<object>(null); }