这篇文章主要介绍.net MVC如何使用IPrincipal进行Form登录即权限验证，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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
{
///
/// ID
///
public int UserId { get; set; }
///
/// 用户名
///
public string UserName { get; set; }
///
/// 角色ID列表
///
public List 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; }
///
/// 构造函数
///
///
///
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
////// 写入cookie和读取cookie /// 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(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
{
///
/// 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
///
///
public override void OnAuthorization(AuthorizationContext filterContext)
{
base.OnAuthorization(filterContext);
}
///
/// 权限验证
///
///
/// 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
namespace MVCAuthorizeTest.Controllers
{
public class LoginController : Controller
{
[AllowAnonymous]
// GET: Login
public ActionResult Index(string returnUrl)
{
ViewBag.ReturnUrl = returnUrl;
return View();
}
[HttpPost]
[AllowAnonymous]
public ActionResult Index(string name, string password, bool rememberMe, string returnUrl)
{
var account = new UserData()
{
UserName = name,
UserId = 110,
Roles = new List() { 1, 2, 3 }
};
HttpFormsAuthentication.SetAuthenticationCoolie(account, rememberMe ? 7 : 0);
if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/") && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
{
return Redirect(returnUrl);
}
else
{
return RedirectToAction("Index", "Home");
}
}
// POST: /Account/LogOff
[HttpPost]
public ActionResult LogOff()
{
System.Web.Security.FormsAuthentication.SignOut();
return RedirectToAction("Index", "Home");
}
}
} 7.对需要验证的controller或action添加特性标签
[FormAuthorize(Roles = "1,2")]
public class HomeController : Controller
{
[FormAuthorize]
public ActionResult Index()
{
return View();
}
}如图
8.在添加FilterConfig中添加全局注册filter，减少每个action分别设置。如果有不需要验证的页面，添加[AllowAnonymous]特性即可
public class FilterConfig
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new HandleErrorAttribute());
//全局注册filter
filters.Add(new FormAuthorizeAttribute());
}
}以上是“.net MVC如何使用IPrincipal进行Form登录即权限验证”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注创新互联行业资讯频道！
