大部分系统都会有权限模块，别人家系统的权限怎么生成的我不知道，我只知道这样做是可以并且挺好的。
文章中只对asp.net core的部分代码进行说明 呃 记录~，mvc版本自行前往仓库查阅
代码中的一些特性标记后面列出,或前往仓库查看~

1.根据特性标记生成模块权限

先上效果图，感兴趣的前往Demo仓库地址，不感兴趣的关闭页面吧~

模型定义

Demo中菜单分为三级，首先使用枚举定义模块,FirstModuleMenu为一级菜单，SecondModuleMenu为二级菜单，三级菜单在action方法上由PermissionDescription标识并IsMenu=true的方法
若是页面功能则为IsMenu=false
可使用的特性标记还包含以下几种，并且权限验证时依次递增：

• 免登录：AllowAnonymous
• 管理员默认权限： NonePermissionAttribute
• 指定权限： PermissionDescriptionAttribute
• 依赖权限(包含有这些的任一权限都将获得授权)： ParentPermissionAttribute

    //一级菜单public class FirstModuleMenu{public const string 系统管理 = "系统|icon-setting";public const string 用户管理 = "用户|icon-user";}//二级菜单public enum SecondModuleMenu{[Description(FirstModuleMenu.系统管理)]系统设置,[Description(FirstModuleMenu.用户管理)]用户管理,}//三级菜单[PermissionDescription(SecondModuleMenu.系统设置, "站点设置", true)]public ActionResult SiteSetting(){return Content("站点设置 System/SiteSetting");}

生成权限模型集合

定义权限模型 SysModule.cs
调用初始化权限方法

    private static List<SysModule> _AllAdminModule { get; set; } = new List<SysModule>();/// <summary>/// 初始化权限/// </summary>public static void InitPermission(){var result = new List<SysModule>();#region 通过反射读取Action方法写入对应权限至集合//读取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 = "";//默认未使用区域var now = DateTime.Now;var i = 1;foreach (var type in types){//获取所有action方法var members = type.GetMethods().Where(e => e.ReturnType.Name == nameof(ActionResult) || e.ReturnType.Name == nameof(IActionResult));foreach (var member in members){//获取功能列表var attrs = member.GetCustomAttributes(typeof(PermissionDescriptionAttribute), true);if (attrs.Length == 0)continue;//功能对应的二级菜单var parentMenuEnum = (attrs[0] as PermissionDescriptionAttribute).ParentMenu;var parentMenuName = parentMenuEnum.ToString();//功能对应的一级菜单 名称|icon类名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>();//添加一级菜单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);//添加二级菜单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 添加到数据库_AllAdminModule = result;}

2.使用过滤器拦截请求进行验证

新建特性标记 AdminAuthorizeAttribute 继承Attribute类以及实现IAuthorizationFilter接口的OnAuthorization方法
不多说，上图

不多说，上代码↓_↓

权限验证过滤器：AdminAuthorizeAttribute

    //后台权限验证public class AdminAuthorizeAttribute : Attribute,IAuthorizationFilter{public void OnAuthorization(AuthorizationFilterContext filterContext){//匿名标识 无需验证if (filterContext.Filters.Any(e => (e as AllowAnonymous) != null))return;var adminInfo = GlobalContext.AdminInfo;//此处应为获取的登录用户if (adminInfo == null){if(filterContext.HttpContext.Request.Headers["X-Requested-With"] == "XMLHttpRequest"){filterContext.Result = new JsonResult("未登录");}else{filterContext.Result =new ContentResult() { Content = "未登录" };}return;}//对应action方法或者Controller上若存在NonePermissionAttribute标识，即表示为管理员的默认权限,只要登录就有权限var isNone = filterContext.Filters.Any(e => (e as NonePermissionAttribute) != null);if (isNone)return;//获取请求的区域，控制器，action名称var area = filterContext.RouteData.DataTokens["area"]?.ToString();var controller = filterContext.RouteData.Values["controller"]?.ToString();var action = filterContext.RouteData.Values["action"]?.ToString();var isPermit = false;//校验权限isPermit = ServiceFactory.CheckAdminPermit(adminInfo.Id, area, controller, action);if (isPermit)return;//此action方法的父辈权限判断，只要有此action对应的父辈权限，皆有权限访问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 = "无权限访问" };return;}}}

自定义特性标记，用于权限校验

此处的自定义的特性标记不能继承Attribute，因无法在AdminAuthorizeAttribute中的上下文filterContext.Filters中获取到特性标记(不知道咋取特性标记，所以用这种方式代替，也更为简单 冏)
!!!!!!!!!修改： 之前脑袋没有转过弯来，要使过滤器上下文的Filters中发现自定义过滤器需要继承 Attribute, IFilterMetadata

    /// <summary>/// 管理员的默认权限/// </summary>public class NonePermissionAttribute : Attribute, IFilterMetadata{}/// <summary>/// 匿名验证/// </summary>public class AllowAnonymous : Attribute, IFilterMetadata{}/// <summary>/// 长辈权限/// </summary>[AttributeUsage(AttributeTargets.Method, AllowMultiple = true, Inherited = true)]public class ParentPermissionAttribute : Attribute, IFilterMetadata{/// <summary>/// 区域/// </summary>public string Area { get; set; }/// <summary>/// 控制器/// </summary>public string Controller { get; set; }/// <summary>/// Action名称/// </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;}}

若将代码全部贴出，有点略显多余，故，只贴出了部分核心代码.其他一些模型，扩展 请直奔仓库地址...
或使用git命令克隆MvcPermission分支到MvcPermission文件夹：git clone https://git.coding.net/yimocoding/WeDemo.git -b MvcPermission

补充

• 2017-09-29
  突然灵光一现，将文中的ResultFilterAttribute特性标记替换为Attribute, IFilterMetadata ，果然可以~
  故得出：实现了IFilterMetadata的特性标记能够在过滤器的上下文中获取到。