public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context) { var allowedOrigin = context.OwinContext.Get <string>("ou:clientAllowedOrigin"); if (allowedOrigin == null) { allowedOrigin = "*"; } //context.OwinContext.Response.Headers.Add("Access-Control-Allow-Origin", new[] { allowedOrigin }); using (IdentityUserRepository _identityUserRepository = new IdentityUserRepository()) { IdentityUser user = await _identityUserRepository.FindUser(context.UserName, context.Password); if (user == null) { context.SetError("invalid_grant", "The user name or password is incorrect."); return; } } var identity = new ClaimsIdentity(context.Options.AuthenticationType); identity.AddClaim(new Claim(ClaimTypes.Name, context.UserName)); identity.AddClaim(new Claim(ClaimTypes.Role, "user")); identity.AddClaim(new Claim("sub", context.UserName)); var props = new AuthenticationProperties(new Dictionary <string, string> { { "ou:client_id", (context.ClientId == null) ? string.Empty : context.ClientId }, { "userName", context.UserName } }); var ticket = new AuthenticationTicket(identity, props); context.Validated(ticket); }