代码之家 › 专栏 › 技术社区 › Jayendran

在Web API(.Net Framework)中创建自定义属性

authorize-attribute asp.net-web-api2 oauth-2.0 c#

9

Jayendran · 技术社区 · 6 年前

我正在使用OAuth2。我的WebAPI中的0 Owin(密码授予)。我最初的象征性回应如下

{
    "access_token": "_ramSlQYasdsRTWEWew.....................",
    "token_type": "bearer",
    "expires_in": 17999,
    "permissions": {
        "user": [
            "Add",
            "Update",
            "Delete"
        ],
        "Product": [
            "Read",
            "Create"
        ]
    }
}

我已经 customized 通过创建一个名为 permissions 它们拥有相应用户的权限。

从这里,我需要验证我的客户的每个请求 Resource server ,通过使用Authorize属性检查用户是否有足够的权限调用API。

我发现了一个类似的例子 here 它处理的是点网核心,这不适合我的情况。

困难的是 permission JSON密钥本身就与 ArrayList

[CustomAuthorize(PermissionItem.Product, PermissionAction.Read)]
    public async Task<IActionResult> Index()
    {
        return View(Index);
    }

public class CustomAuthorize : AuthorizeAttribute {
    public AuthorizeAttribute (PermissionItem item, PermissionAction action) {
        //Need to initalize the Permission Enums
    }
    public override void OnAuthorization (HttpActionContext actionContext) {
        //Code to get the value from Permissions ArrayList and compare it with the Enum values
    }
}

以上就是我的想法。但由于问题的复杂性 Permissions 键和枚举比较我无法前进。

此外,还有一个问题,比如用户的权限是否为“添加”以及“更新”,这意味着我需要在控制器之前创建两个属性条件。

喜欢

[CustomAuthorize(PermissionItem.User, PermissionAction.Add)]
[CustomAuthorize(PermissionItem.User, PermissionAction.Update)]

这会导致添加更多的属性行。那么,有没有办法让它成为一个单一的条件 | 分开了?

[CustomAuthorize(PermissionItem.User, PermissionAction.Update|PermissionAction.Add)]

3 回复 | 直到 6 年前

1

7

Dipen Shah 6 年前

为什么不允许CustomAuthorize构造函数有多个权限操作。

public class CustomAuthorize : AuthorizeAttribute
{
    private readonly PermissionAction[] permissionActions;

    public CustomAuthorize(PermissionItem item, params PermissionAction[] permissionActions)
    {
        this.permissionActions = permissionActions;
    }

    public override void OnAuthorization(HttpActionContext actionContext)
    {
        var currentIdentity = System.Threading.Thread.CurrentPrincipal.Identity;
        if (!currentIdentity.IsAuthenticated) {
            // redirect to access denied page
        }

        var userName = currentIdentity.Name;
        // step 1 : retrieve user object

        // step 2 : retrieve user permissions

        // step 3 : match user permission(s) agains class/method's required premissions

        // step 4 : continue/redirect to access denied page
    }
}

你将用以下内容为你的课堂做注解: [CustomAuthorize(PermissionItem.User, PermissionAction.Update, PermissionAction.Add)]

我不确定OP在这里想要实现什么。如果您依赖HTTP请求来提供访问权限,那么这是一个很大的安全漏洞。在每个请求中,您应该从数据库中检索用户的访问权限信息,然后根据类/方法的所需权限进行匹配。

CustomAttribute的实现

public class CustomAuthorize : System.Web.Http.AuthorizeAttribute
{
    private readonly PermissionAction[] permissionActions;

    public CustomAuthorize(PermissionItem item, params PermissionAction[] permissionActions)
    {
        this.permissionActions = permissionActions;
    }

    protected override Boolean IsAuthorized(HttpActionContext actionContext)
    {
        var currentIdentity = actionContext.RequestContext.Principal.Identity;
        if (!currentIdentity.IsAuthenticated)
            return false;

        var userName = currentIdentity.Name;
        using (var context = new DataContext())
        {
            var userStore = new UserStore<AppUser>(context);
            var userManager = new UserManager<AppUser>(userStore);
            var user = userManager.FindByName(userName);

            if (user == null)
                return false;

            foreach (var role in permissionActions)
                if (!userManager.IsInRole(user.Id, Convert.ToString(role)))
                    return false;

            return true;
        }
    }
}

2

1

3dd 6 年前

你可以让我们使用标志和二进制操作,让你把不同的操作放在一起。

下面的代码显示了一个如何实现的小示例

class Program {
    static void Main(string[] args) {
        Test test = new Test();
        CustomAuthorizeAttribute customAuthorizeAttribute = (CustomAuthorizeAttribute)Attribute.GetCustomAttribute(typeof(Test), typeof(CustomAuthorizeAttribute));

        customAuthorizeAttribute.Test();

        Console.ReadKey();
    }
}

[CustomAuthorize(PermissionActions = PermissionAction.Add | PermissionAction.Delete)]
public class Test {

}

public class CustomAuthorizeAttribute : Attribute {
    public PermissionAction PermissionActions { get; set; }

    public void Test() {
        if ((PermissionActions & PermissionAction.Add) == PermissionAction.Add) Console.WriteLine("Add");
        if ((PermissionActions & PermissionAction.Delete) == PermissionAction.Delete) Console.WriteLine("Delete");
        if ((PermissionActions & PermissionAction.Update) == PermissionAction.Update) Console.WriteLine("Update");
    }
}

public enum PermissionAction {
    Add = 1,
    Update = 2,
    Delete = 4
}

这将产生以下输出

3

1

Parth Akbari 6 年前

我们已经创建了下面的API过滤器进行身份验证。

这里,“SecretToken”、“MerchantKey”这两个密钥传递到API请求中。我们正在使用“IsValidMerchant”函数从数据库中验证这两个。

IsValidMerchant 此函数直接连接存储相应值的数据库表

public void OnAuthorization(AuthorizationFilterContext actionContext)
{
  const string secretTokenName = "SecretToken";
  const string merchentKeyName = "MerchantKey";
  bool isValid = false;

  if (!actionContext.Filters.Any(item => item is IAllowAnonymousFilter))
    {
     CPServiceResponse response = new CPServiceResponse();
     var secretToken = actionContext.HttpContext.Request.Headers[secretTokenName].FirstOrDefault();
     var merchentKey = actionContext.HttpContext.Request.Headers[merchentKeyName].FirstOrDefault();

      isValid = this.IsValidMerchant(merchentKey, secretToken,_productCode);

       if (isValid == false)
        {
          response.Status = (int)HttpStatusCode.Unauthorized;
          response.Message = Hegic.Shared.Resource.Common.UnauthorizedRequestError;
          actionContext.Result = new JsonResult("")
                {
                    Value = new { Status = response }
                };
         }
      }
  }