在 MVC3 中使用自定义 IPrincipal 和 IIdentity

Question

我创建了自己的IPrincipal 和IIdentity 实现，如下所示：

[ComVisible(true)]
[Serializable]
public sealed class CustomIdentity : IIdentity {

    private readonly string _name;
    private readonly string _email;
    // and other stuffs

    public CustomIdentity(string name) {
        _name = name.Trim();
        if(string.IsNullOrWhiteSpace(name))
            return;
        _email = (connect to database and read email and other stuffs);
    }

    public string Name {
        get { return _name; }
    }

    public string Email {
        get { return _email; }
    }

    public string AuthenticationType {
        get { return "CustomIdentity"; }
    }

    public bool IsAuthenticated {
        get { return !string.IsNullOrWhiteSpace(_name); }
    }

}


[ComVisible(true)]
[Serializable]
public sealed class CustomPrincipal : IPrincipal {

    private readonly CustomIdentity _identity;

    public CustomPrincipal(CustomIdentity identity) {
        _identity = identity;
    }

    public bool IsInRole(string role) {
        return _identity != null && 
               _identity.IsAuthenticated &&
               !string.IsNullOrWhiteSpace(role) &&
               Roles.IsUserInRole(_identity.Name, role);
    }

    IIdentity IPrincipal.Identity {
        get { return _identity; }
    }

    public CustomIdentity Identity {
        get { return _identity; }
    }

}

另外，我创建了一个 HttpModule 并在其 AuthenticateRequest 事件中，我这样做：

    public void Init(HttpApplication context) {
        _application = context;
        _application.AuthenticateRequest += ApplicationAuthenticateRequest;
    }

    private void ApplicationAuthenticateRequest(object sender, EventArgs e) {
        var formsCookie = _application.Request.Cookies[FormsAuthentication.FormsCookieName];
        var identity = formsCookie != null
             ? new CustomIdentity(FormsAuthentication.Decrypt(formsCookie.Value).Name)
             : new CustomIdentity(string.Empty);
        var principal = new CustomPrincipal(identity);
        _application.Context.User = Thread.CurrentPrincipal = principal;
    }

另外，我创建了自己的 Controller 和 WebViewPage，如下所示：

public abstract class CustomController : Controller {
    public new CustomPrincipal User {
        get {
            var user = System.Web.HttpContext.Current.User as CustomPrincipal;
            return user;
        }
    }
}


public abstract class CustomWebViewPage<TModel> : WebViewPage<TModel> {
    public new CustomPrincipal User {
        get {
            // (Place number 1) here is the error I'm speaking about!!!
            var user = HttpContext.Current.User as CustomPrincipal;
            return user;
        }
    }
}

如上代码所示，似乎一切正常；但如您所见，在 Place number 1 我无法访问CustomPrincipal！意味着在这个地方，我有一个RolePrincipal 而不是CustomPrincipal。例如HttpContext.Current.User 是 RolePrincipal 而不是 CustomPrincipal。但是RolePrincipal.Identity 属性是CustomIdentity！

Answer 1

你的错误在这里：

_application.AuthenticateRequest += ApplicationAuthenticateRequest;

有一个名为RoleManagerModule 的HttpModule 调用HttpApplication.PostAuthenticateRequest 中的方法并将HttpContext.Current.User 设置为RolePrincipal。因此，您在AuthenticateRequest 中设置了User，而RoleManagerModule 在PostAuthenticateRequest 中设置了它，这意味着在您设置之后，因此覆盖您的设置。更改您的Module.Init：

public void Init(HttpApplication context) {
    _application = context;
    // change just this line:
    _application.PostAuthenticateRequest += ApplicationAuthenticateRequest;
}

重要更新：

请参阅this question - 再次由初学者提问，取决于当前的问题 - 如果此解决方案不起作用，请参阅第二个解决方案。