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。