asp.net mvc 权限过滤和单点登录，禁止重复登录
1.权限控制使用controller和 action来实现，权限方式有很多种，最近开发项目使用控制控制器方式实现代码如下
/// <summary>
/// 用户权限控制
/// </summary>
public class UserAuthorize : AuthorizeAttribute
{
/// <summary>
/// 授权失败时呈现的视图
/// </summary>
public string AuthorizationFailView { get; set; }
/// <summary>
/// 请求授权时执行
/// </summary>
/// <param name="filterContext">上下文</param>
public override void OnAuthorization(AuthorizationContext filterContext)
{
// 获取url请求里的 controller 和 action
string controllerName = filterContext.RouteData.Values["controller"].ToString();
string actionName = filterContext.RouteData.Values["action"].ToString();
// 获取用户信息
UserLoginBaseInfo _userLoginInfo = filterContext.HttpContext.Session[Property.UerLoginSession] as UserLoginBaseInfo;
//根据请求过来的controller和action去查询可以被哪些角色操作: 这是查询数据库 roleid使用 1,2,3,4格式
RoleWithControllerAction roleWithControllerAction =
SampleData.roleWithControllerAndAction.FirstOrDefault(r => r.ControllerName.ToLower() == controllerName.ToLower() && r.ActionName.ToLower() == actionName.ToLower() && r.RoleIds.contails("3"));
// 有值处理
if (roleWithControllerAction != null)
{
//有权限操作当前控制器和Action的角色id
this.Roles = roleWithControllerAction.RoleIds;
}
else
{
//请求失败输出空结果
filterContext.Result = new EmptyResult();
//打出提示文字
HttpContext.Current.Response.Write("对不起,你没有权限操作!");
}
base.OnAuthorization(filterContext);
}
/// <summary>
/// 自定义授权检查（返回False则授权失败）
/// </summary>
protected override bool AuthorizeCore(HttpContextBase httpContext)
{
//if (httpContext.User.Identity.IsAuthenticated)
//{
// string userName = httpContext.User.Identity.Name; //当前登录用户的用户名
// User user = SampleData.users.Find(u => u.UserName == userName); //当前登录用户对象
// if (user != null)
// {
// Role role = SampleData.roles.Find(r => r.Id == user.RoleId); //当前登录用户的角色
// foreach (string roleid in Roles.Split(','))
// {
// if (role.Id.ToString() == roleid)
// return true;
// }
// return false;
// }
// else
// return false;
//}
//else
// return false; //进入HandleUnauthorizedRequest
return true;
}
/// <summary>
/// 处理授权失败的HTTP请求
/// </summary>
protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
{
if (string.IsNullOrWhiteSpace(AuthorizationFailView))
AuthorizationFailView = "error";
filterContext.Result = new ViewResult { ViewName = AuthorizationFailView };
}
}
二.单点登录方式使用application方式来实现
1.用户登录成功后记录当前信息
/// <summary>
/// 限制一个用户只能登陆一次
/// </summary>
/// <returns></returns>
private void GetOnline()
{
string UserID = "1";
Hashtable SingleOnline = (Hashtable)System.Web.HttpContext.Current.Application[Property.Online];
if (SingleOnline == null)
SingleOnline = new Hashtable();
IDictionaryEnumerator idE = SingleOnline.GetEnumerator();
string strKey = string.Empty;
while (idE.MoveNext())
{
if (idE.Value != null && idE.Value.ToString().Equals(UserID))
{
//already login
strKey = idE.Key.ToString();
//当前用户已存在移除、
SingleOnline.Remove(strKey);
System.Web.HttpContext.Current.Application.Lock();
System.Web.HttpContext.Current.Application[Property.Online] = SingleOnline;
System.Web.HttpContext.Current.Application.UnLock();
break;
}
}
//SessionID
if (!SingleOnline.ContainsKey(Session.SessionID))
{
SingleOnline[Session.SessionID] = UserID;
System.Web.HttpContext.Current.Application.Lock();
System.Web.HttpContext.Current.Application[Property.Online] = SingleOnline;
System.Web.HttpContext.Current.Application.UnLock();
}
}
2.使用ActionFilter来实现单点登录，每次点击控制器都去查询过滤是否在其它地方登录
/// <summary>
/// 用户基础信息过滤器
/// </summary>
public class LoginActionFilter : ActionFilterAttribute
{
/// <summary>
/// 初始化地址
/// </summary>
public const string Url = "~/Login/Index?error=";
/// <summary>
/// 该方法会在action方法执行之前调用
/// </summary>
/// <param name="filterContext">上下文</param>
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
// 获取上一级url
// var url1 = filterContext.HttpContext.Request.UrlReferrer;
UserLoginBaseInfo _userLogin = filterContext.HttpContext.Session[Property.UerLoginSession] as UserLoginBaseInfo;
// 用户是否登陆
if (_userLogin == null)
{
filterContext.Result = new RedirectResult(Url + "登陆时间过期,请重新登陆!&url=" + filterContext.HttpContext.Request.RawUrl);
}
else
{
filterContext.HttpContext.Session.Timeout = 30;
}
//判断是否在其它地方登录
Hashtable singleOnline = (Hashtable)System.Web.HttpContext.Current.Application[Property.Online];
// 判断当前SessionID是否存在
if (singleOnline != null && !singleOnline.ContainsKey(HttpContext.Current.Session.SessionID))
filterContext.Result = new RedirectResult(Url + "你的帐号已在别处登陆，你被强迫下线!");
base.OnActionExecuting(filterContext);
}
/// <summary>
/// 执行后
/// </summary>
/// <param name="filterContext"></param>
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
//记录操作日志，写进操作日志中
var controllerName = filterContext.RouteData.Values["controller"];
var actionName = filterContext.RouteData.Values["action"];
base.OnResultExecuting(filterContext);
}
3.用户正常退出或则非正常退出处理当前用户信息销毁Session
/// <summary>
/// Session销毁
/// </summary>
protected void Session_End()
{
Hashtable SingleOnline = (Hashtable)Application[Property.Online];
if (SingleOnline != null && SingleOnline[Session.SessionID] != null)
{
SingleOnline.Remove(Session.SessionID);
Application.Lock();
Application[Property.Online] = SingleOnline;
Application.UnLock();
}
Session.Abandon();
}
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