Blog.Common.Identity.OAuth.BlogOAuthAuthorizationServerProvider.GrantResourceOwnerCredentials C# (CSharp) Method

        public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
        {
            context.OwinContext.Response.Headers.Add("Access-Control-Allow-Origin", new[] { "*" });

            var userManager = context.OwinContext.GetUserManager<BlogUserManager>();
            var user = await userManager.FindAsync(context.UserName, context.Password);
            
            if (user == null)
            {
                context.SetError("invalid_grant", "The user name or password is incorrect.");
                return;
            }

            var oAuthIdentity = await user.GenerateUserIdentityAsync(userManager);
            var cookiesIdentity = await user.GenerateUserIdentityAsync(userManager);

            var properties = CreateProperties(user.UserName);
            var ticket = new AuthenticationTicket(oAuthIdentity, properties);
            context.Validated(ticket);
            context.Request.Context.Authentication.SignIn(cookiesIdentity);
        }