大部分系統都會有權限模塊，別人家系統的權限怎么生成的我不知道，我只知道這樣做是可以并且挺好的。
文章中只對asp.net core的部分代碼進行說明 呃 記錄~，mvc版本自行前往倉庫查閱
代碼中的一些特性標記后面列出,或前往倉庫查看~

1.根據特性標記生成模塊權限

先上效果圖，感興趣的前往Demo倉庫地址，不感興趣的關閉頁面吧~

模型定義

Demo中菜單分為三級，首先使用枚舉定義模塊,FirstModuleMenu為一級菜單，SecondModuleMenu為二級菜單，三級菜單在action方法上由PermissionDescription標識并IsMenu=true的方法
若是頁面功能則為IsMenu=false
可使用的特性標記還包含以下幾種，并且權限驗證時依次遞增：

• 免登錄：AllowAnonymous
• 管理員默認權限： NonePermissionAttribute
• 指定權限： PermissionDescriptionAttribute
• 依賴權限(包含有這些的任一權限都將獲得授權)： ParentPermissionAttribute

//一級菜單public class FirstModuleMenu{public const string 系統管理 = "系統|icon-setting";public const string 用戶管理 = "用戶|icon-user";}//二級菜單public enum SecondModuleMenu{[Description(FirstModuleMenu.系統管理)]系統設置,[Description(FirstModuleMenu.用戶管理)]用戶管理,}//三級菜單[PermissionDescription(SecondModuleMenu.系統設置, "站點設置", true)]public ActionResult SiteSetting(){return Content("站點設置 System/SiteSetting");}

生成權限模型集合

定義權限模型 SysModule.cs
調用初始化權限方法

private static List<SysModule> _AllAdminModule { get; set; } = new List<SysModule>();/// <summary>/// 初始化權限/// </summary>public static void InitPermission(){var result = new List<SysModule>();#region 通過反射讀取Action方法寫入對應權限至集合//讀取CoreDemo程序集中集成自AdminController的控制器var types = Assembly.Load("CoreDemo").GetTypes().Where(e => e.BaseType.Name == nameof(AdminController));var area = "";//默認未使用區域var now = DateTime.Now;var i = 1;foreach (var type in types){//獲取所有action方法var members = type.GetMethods().Where(e => e.ReturnType.Name == nameof(ActionResult) || e.ReturnType.Name == nameof(IActionResult));foreach (var member in members){//獲取功能列表var attrs = member.GetCustomAttributes(typeof(PermissionDescriptionAttribute), true);if (attrs.Length == 0)continue;//功能對應的二級菜單var parentMenuEnum = (attrs[0] as PermissionDescriptionAttribute).ParentMenu;var parentMenuName = parentMenuEnum.ToString();//功能對應的一級菜單 名稱|icon類名var enumArry = parentMenuEnum.GetEnumDescription().Split('|');var mainMenuName = enumArry[0];var existMainMenu = result.Where(e => e.ModuleName == mainMenuName).FirstOrDefault();if (existMainMenu == null){var mainMenu = new SysModule(){Id = i,ParentId = 0,ModuleName = mainMenuName,Icon = enumArry[1] ?? "",Area = area,Controller=string.Empty,Action=string.Empty,IsMenu = true,IsVisible = true,Remark = string.Empty,DisplayOrder = i,CreateTime = now};i++;existMainMenu = mainMenu;existMainMenu.Children = new List<SysModule>();//添加一級菜單result.Add(existMainMenu);}var existParentMenu = existMainMenu.Children.Where(e => e.ModuleName == parentMenuName).FirstOrDefault();if (existParentMenu == null){var parentMenu = new SysModule(){Id = i,ParentId = existMainMenu.Id,ModuleName = parentMenuName,Icon=string.Empty,Area = area,Controller = string.Empty,Action = string.Empty,IsMenu = enumArry.Length != 3 || bool.Parse(enumArry[2]),IsVisible = true,DisplayOrder = i,CreateTime = now,Children = new List<SysModule>()};i++;existParentMenu = parentMenu;existParentMenu.Children = new List<SysModule>();existMainMenu.Children.Add(existParentMenu);//添加二級菜單result.Add(existParentMenu);}var menu = new SysModule(){Id = i,ParentId = existParentMenu.Id,Area = area,Action = member.Name,DisplayOrder = i,CreateTime = now,Controller = member.DeclaringType.Name.Substring(0, member.DeclaringType.Name.Length - 10),IsMenu = (attrs[0] as PermissionDescriptionAttribute).IsMenu,Children = new List<SysModule>(),};if (menu.IsMenu)menu.IsVisible = true;menu.ModuleName = (attrs[0] as PermissionDescriptionAttribute).FuncName;i++;existParentMenu.Children.Add(menu);result.Add(menu);}}#endregion//todo 添加到數據庫_AllAdminModule = result;}

2.使用過濾器攔截請求進行驗證

新建特性標記 AdminAuthorizeAttribute 繼承Attribute類以及實現IAuthorizationFilter接口的OnAuthorization方法
不多說，上圖

不多說，上代碼↓_↓

權限驗證過濾器：AdminAuthorizeAttribute

//后臺權限驗證public class AdminAuthorizeAttribute : Attribute,IAuthorizationFilter{public void OnAuthorization(AuthorizationFilterContext filterContext){//匿名標識 無需驗證if (filterContext.Filters.Any(e => (e as AllowAnonymous) != null))return;var adminInfo = GlobalContext.AdminInfo;//此處應為獲取的登錄用戶if (adminInfo == null){if(filterContext.HttpContext.Request.Headers["X-Requested-With"] == "XMLHttpRequest"){filterContext.Result = new JsonResult("未登錄");}else{filterContext.Result =new ContentResult() { Content = "未登錄" };}return;}//對應action方法或者Controller上若存在NonePermissionAttribute標識，即表示為管理員的默認權限,只要登錄就有權限var isNone = filterContext.Filters.Any(e => (e as NonePermissionAttribute) != null);if (isNone)return;//獲取請求的區域，控制器，action名稱var area = filterContext.RouteData.DataTokens["area"]?.ToString();var controller = filterContext.RouteData.Values["controller"]?.ToString();var action = filterContext.RouteData.Values["action"]?.ToString();var isPermit = false;//校驗權限isPermit = ServiceFactory.CheckAdminPermit(adminInfo.Id, area, controller, action);if (isPermit)return;//此action方法的父輩權限判斷，只要有此action對應的父輩權限，皆有權限訪問var pAttrs = filterContext.Filters.Where(e => (e as ParentPermissionAttribute) != null).ToList();if (pAttrs.Count > 0){foreach (ParentPermissionAttribute pattr in pAttrs){if (!string.IsNullOrEmpty(pattr.Area))area = pattr.Area;isPermit = ServiceFactory.CheckAdminPermit(adminInfo.Id, area, pattr.Controller, pattr.Action);if (isPermit)return;}}if (!isPermit){filterContext.Result = new ContentResult() { Content = "無權限訪問" };return;}}}

自定義特性標記，用于權限校驗

此處的自定義的特性標記不能繼承Attribute，因無法在AdminAuthorizeAttribute中的上下文filterContext.Filters中獲取到特性標記(不知道咋取特性標記，所以用這種方式代替，也更為簡單 冏)
!!!!!!!!!修改： 之前腦袋沒有轉過彎來，要使過濾器上下文的Filters中發現自定義過濾器需要繼承 Attribute, IFilterMetadata

/// <summary>/// 管理員的默認權限/// </summary>public class NonePermissionAttribute : Attribute, IFilterMetadata{}/// <summary>/// 匿名驗證/// </summary>public class AllowAnonymous : Attribute, IFilterMetadata{}/// <summary>/// 長輩權限/// </summary>[AttributeUsage(AttributeTargets.Method, AllowMultiple = true, Inherited = true)]public class ParentPermissionAttribute : Attribute, IFilterMetadata{/// <summary>/// 區域/// </summary>public string Area { get; set; }/// <summary>/// 控制器/// </summary>public string Controller { get; set; }/// <summary>/// Action名稱/// </summary>public string Action { get; set; }public ParentPermissionAttribute(string area, string controller, string action){this.Area = area;this.Controller = controller;this.Action = action;}public ParentPermissionAttribute(string controller, string action){this.Controller = controller;this.Action = action;}}

若將代碼全部貼出，有點略顯多余，故，只貼出了部分核心代碼.其他一些模型，擴展 請直奔倉庫地址...
或使用git命令克隆MvcPermission分支到MvcPermission文件夾：git clone https://git.coding.net/yimocoding/WeDemo.git -b MvcPermission

補充

• 2017-09-29
  突然靈光一現，將文中的ResultFilterAttribute特性標記替換為Attribute, IFilterMetadata ，果然可以~
  故得出：實現了IFilterMetadata的特性標記能夠在過濾器的上下文中獲取到。

轉載于:https://www.cnblogs.com/morang/p/7606843.html

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