.Net Core 權限驗證與授權（AuthorizeFilter、ActionFilterAttribute）

在.Net Core 中使用AuthorizeFilter或者ActionFilterAttribute來實現登錄權限驗證和授權

一、AuthorizeFilter

新建授權類AllowAnonymous繼承AuthorizeFilter，IAllowAnonymousFilter

public class AllowAnonymous : AuthorizeFilter, IAllowAnonymousFilter
{
 
 }

新建攔截類繼承AuthorizeFilter

public class LoginAuthorzation : AuthorizeFilter
{
 
}

在攔截類里加入處理請求的方法

/// <summary>
  /// 請求驗證，當前驗證部分不要拋出異常，ExceptionFilter不會處理
  /// </summary>
  /// <param name="context">請求內容信息</param>
  public override async Task OnAuthorizationAsync(AuthorizationFilterContext context)
  {
   if (IsHaveAllow(context.Filters))
   {
    return;
   }
  
 
   //解析url
   // {/ Home / Index}
   var url = context.HttpContext.Request.Path.Value;
   if (string.IsNullOrWhiteSpace(url))
   {
    return;
   }
 
   var list = url.Split("/");
   if (list.Length<=0||url=="/")
   {
    return;
   }
   var controllerName = list[1].ToString().Trim();
   var actionName = list[2].ToString().Trim();
  
 
   //驗證
   var flag=PowerIsTrue.IsHavePower(controllerName, actionName);
   if (flag.Item1!=0)
   {
 
    context.Result = new RedirectResult("/Home/Index");
   }
  }
  
 
//判斷是否不需要權限
 
public static bool IsHaveAllow(IList<IFilterMetadata> filers)
  {
   for (int i = 0; i < filers.Count; i++)
   {
    if (filers[i] is IAllowAnonymousFilter)
    {
     return true;
    }
   }
   return false;
 
  } 

 

新建一個業務邏輯判斷的類

public static (int,string) IsHavePower(string controllerName,string actionName)
  {
 
   return (0,"通過");
 
  }

在Startup注冊

services.AddMvc(options =>
  {
 
   options.Filters.Add<LoginAuthorzation>(); // 添加身份驗證過濾器
 
  }

context.HttpContext.Request.Path.Value   獲取請求過來的url

二、ActionFilterAttribute

創建權限判斷類繼承ActionFilterAttribute

public class ActionFilterAttributeLogin: ActionFilterAttribute
 {
  public override void OnActionExecuting(ActionExecutingContext filterContext)
 
   {
   var isDefined = false;
   var controllerActionDescriptor = filterContext.ActionDescriptor as ControllerActionDescriptor;
   if (controllerActionDescriptor != null)
   {
    isDefined = controllerActionDescriptor.MethodInfo.GetCustomAttributes(inherit: true)
     .Any(a => a.GetType().Equals(typeof(NoPermissionRequiredAttribute)));
   }
   if (isDefined) return;
   if (string.IsNullOrWhiteSpace(filterContext.HttpContext.Request.Query["LoginInfo"].ToString()))
   {
    var item = new ContentResult();
    item.Content = "沒得權限";
     
    filterContext.Result = new RedirectResult("/Account/Login");
   }
   base.OnActionExecuting(filterContext);
  }
 
  public class NoPermissionRequiredAttribute : ActionFilterAttribute
  {
   public override void OnActionExecuting(ActionExecutingContext filterContext)
   {
    base.OnActionExecuting(filterContext);
 
   }
 
  }
 }

在Startup注冊

services.AddMvc(options =>
   {
    options.Filters.Add<ActionFilterAttributeLogin>(); // 添加身份驗證過濾器 -- 菜單操作權限
 
   }

filterContext.ActionDescriptor as ControllerActionDescriptor    獲取請求進來的控制器與方法

controllerActionDescriptor.MethodInfo.GetCustomAttributes(inherit: true )

.Any(a => a.GetType().Equals( typeof (NoPermissionRequiredAttribute)))      判斷請求的控制器和方法有沒有加上NoPermissionRequiredAttribute（不需要權限）

string.IsNullOrWhiteSpace(filterContext.HttpContext.Request.Query["LoginInfo"].ToString())     判斷請求頭是否有標識