如何在ASP中限制用户只能访问一个令牌。网络标识

我在webApi应用程序中使用基于令牌的身份验证。对于每个登录,OAuth为用户生成一个访问令牌。如果用户尝试多次登录。它可能拥有一些更有效的令牌。 此过程是否有限制。

这是我的创业课程:

 public void Configuration(IAppBuilder app)
 {
     HttpConfiguration config = new HttpConfiguration();

     ConfigureOAuth(app);

     WebApiConfig.Register(config);
     app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
     app.UseWebApi(config);
     //Rest of code is here;
 }

 public void ConfigureOAuth(IAppBuilder app)
 {
     OAuthAuthorizationServerOptions OAuthServerOptions = new OAuthAuthorizationServerOptions()
     {
         AllowInsecureHttp = true,
         TokenEndpointPath = new PathString("/token"),
         AccessTokenExpireTimeSpan = TimeSpan.FromDays(1),
         Provider = new SimpleAuthorizationServerProvider()
     };

     // Token Generation
     app.UseOAuthAuthorizationServer(OAuthServerOptions);
     app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
 }

下面是“GrantResourceOwnerCredentials”方法:

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

 using (AuthRepository _repo = new AuthRepository())
 {
     IdentityUser user = await _repo.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("sub", context.UserName));
 identity.AddClaim(new Claim("role", "user"));

 context.Validated(identity);

 }