.net MVC使用IPrincipal进行Form登录即权限验证，供大家参考，具体内容如下
1.在MVC项目中添加用户类，可以根据实际项目需求添加必要属性
public class UserData { /// <summary> /// ID /// </summary> public int UserId { get; set; } /// <summary> /// 用户名 /// </summary> public string UserName { get; set; } /// <summary> /// 角色ID列表 /// </summary> public List<int> Roles { get; set; } }
2.添加类Principal实现IPrincipal接口
public class Principal : IPrincipal { public IIdentity Identity { get; private set;} public UserData Account { get; set; } /// <summary> /// 构造函数 /// </summary> /// <param></param> /// <param></param> public Principal(FormsAuthenticationTicket ticket, UserData account) { if (ticket == null) throw new ArgumentNullException("ticket"); if (account == null) throw new ArgumentNullException("UserData"); this.Identity = new FormsIdentity(ticket); this.Account = account; } public bool IsInRole(string role) { if (string.IsNullOrEmpty(role)) return true; if (this.Account == null || this.Account.Roles == null) return false; return role.Split(',').Any(q => Account.Roles.Contains(int.Parse(q))); } }
IPrincipal接口有对象Identity已经需要实现验证角色方法IsInRole()。在我们的实现类中添加了"用户信息(UserData)"属性Account。
构造函数中进行了初始化，第一个对象为Form验证的票据对象，下面ticket会携带用户信息一起保存进cookie中。
3.创建存储cookie和读取cookie的类
/// <summary> /// 写入cookie和读取cookie /// </summary> public class HttpFormsAuthentication { //将用户信息通过ticket加密保存到cookie public static void SetAuthenticationCoolie(UserData account, int rememberDay = 0) { if (account == null) throw new ArgumentNullException("account"); //序列化account对象 string accountJson = JsonConvert.SerializeObject(account); //创建用户票据 var ticket = new FormsAuthenticationTicket(1, account.UserName, DateTime.Now, DateTime.Now.AddDays(rememberDay), false, accountJson); //加密 string encryptAccount = FormsAuthentication.Encrypt(ticket); //创建cookie var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptAccount) { HttpOnly = true, Secure = FormsAuthentication.RequireSSL, Domain = FormsAuthentication.CookieDomain, Path = FormsAuthentication.FormsCookiePath }; if (rememberDay > 0) cookie.Expires = DateTime.Now.AddDays(rememberDay); //写入Cookie HttpContext.Current.Response.Cookies.Remove(cookie.Name); HttpContext.Current.Response.Cookies.Add(cookie); } //获取cookie并解析出用户信息 public static Principal TryParsePrincipal(HttpContext context) { if (context == null) throw new ArgumentNullException("context"); HttpRequest request = context.Request; HttpCookie cookie = request.Cookies[FormsAuthentication.FormsCookieName]; if (cookie == null || string.IsNullOrEmpty(cookie.Value)) { return null; } //解密coolie值 FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value); UserData account = JsonConvert.DeserializeObject<UserData>(ticket.UserData); return new Principal(ticket, account); } }
存储cookie时将用户信息序列化后的字符串accountJson由ticket其携带加密后保存入cookie中，具体的accountJson被赋值给FormsAuthenticationTicket的UserData属性。
可看到解析时将ticket.UserData反序列化后得到了原始的用户信息对象，然后生成Principal对象。
解析cookie得到Principal对象的方法TryParsePrincipal，下面会在发起请求时用到，而返回的Principal对象被赋值给HttpContext.User。
4.在Global.asax中注册Application_PostAuthenticateRequest事件，保证权限验证前将cookie中的用户信息取出赋值给User
protected void Application_PostAuthenticateRequest(object sender, System.EventArgs e) { HttpContext.Current.User = HttpFormsAuthentication.TryParsePrincipal(HttpContext.Current); }
5.集成AuthorizeAttribute特性类并重写AuthorizeCore，HandleUnauthorizedRequest方法
public class FormAuthorizeAttribute : AuthorizeAttribute { /// <summary> /// 先进入此方法，此方法中会调用 AuthorizeCore 验证逻辑，验证不通过会调用 HandleUnauthorizedRequest 方法 /// </summary> /// <param></param> public override void OnAuthorization(AuthorizationContext filterContext) { base.OnAuthorization(filterContext); } /// <summary> /// 权限验证 /// </summary> /// <param></param> /// <returns></returns> protected override bool AuthorizeCore(HttpContextBase httpContext) { var user = httpContext.User as Principal; if (user != null) return user.IsInRole(base.Roles); return false; } protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext) { //验证不通过，直接跳转到相应页面，注意：如果不是哟娜那个以下跳转，则会继续执行Action方法 filterContext.Result = new RedirectResult("~/Login/Index"); } }
AuthorizeCore与HandleUnauthorizedRequest方法均是在方法OnAuthorization中调用，AuthorizeCore验证不通过才会调用HandleUnauthorizedRequest方法。
将验证代码在AuthorizeCore中实现，验证不通过的逻辑在HandleUnauthorizedRequest方法中实现。
6.添加LoginController实现登录逻辑