我试图使一个自定义授权属性在ASP。净的核心。在以前的版本中,可以重写bool AuthorizeCore(HttpContextBase httpContext)。但是这在AuthorizeAttribute中不再存在。

当前制作自定义AuthorizeAttribute的方法是什么?

我想要完成的:我正在头授权中接收会话ID。通过该ID,我将知道特定操作是否有效。


当前回答

您可以创建自己的AuthorizationHandler,它将在控制器和动作上找到自定义属性,并将它们传递给handlerrequirementasync方法。

public abstract class AttributeAuthorizationHandler<TRequirement, TAttribute> : AuthorizationHandler<TRequirement> where TRequirement : IAuthorizationRequirement where TAttribute : Attribute
{
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, TRequirement requirement)
    {
        var attributes = new List<TAttribute>();

        var action = (context.Resource as AuthorizationFilterContext)?.ActionDescriptor as ControllerActionDescriptor;
        if (action != null)
        {
            attributes.AddRange(GetAttributes(action.ControllerTypeInfo.UnderlyingSystemType));
            attributes.AddRange(GetAttributes(action.MethodInfo));
        }

        return HandleRequirementAsync(context, requirement, attributes);
    }

    protected abstract Task HandleRequirementAsync(AuthorizationHandlerContext context, TRequirement requirement, IEnumerable<TAttribute> attributes);

    private static IEnumerable<TAttribute> GetAttributes(MemberInfo memberInfo)
    {
        return memberInfo.GetCustomAttributes(typeof(TAttribute), false).Cast<TAttribute>();
    }
}

然后你可以在你的控制器或动作上使用它的任何自定义属性。例如,添加权限要求。只需创建您的自定义属性。

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true)]
public class PermissionAttribute : AuthorizeAttribute
{
    public string Name { get; }

    public PermissionAttribute(string name) : base("Permission")
    {
        Name = name;
    }
}

然后创建一个需求,添加到您的策略

public class PermissionAuthorizationRequirement : IAuthorizationRequirement
{
    //Add any custom requirement properties if you have them
}

然后为您的自定义属性创建AuthorizationHandler,继承我们之前创建的AttributeAuthorizationHandler。它将被传递一个IEnumerable,用于handlerrequirementsasync方法中的所有自定义属性,这些属性是由控制器和动作积累而来的。

public class PermissionAuthorizationHandler : AttributeAuthorizationHandler<PermissionAuthorizationRequirement, PermissionAttribute>
{
    protected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, PermissionAuthorizationRequirement requirement, IEnumerable<PermissionAttribute> attributes)
    {
        foreach (var permissionAttribute in attributes)
        {
            if (!await AuthorizeAsync(context.User, permissionAttribute.Name))
            {
                return;
            }
        }

        context.Succeed(requirement);
    }

    private Task<bool> AuthorizeAsync(ClaimsPrincipal user, string permission)
    {
        //Implement your custom user permission logic here
    }
}

最后,在Startup.cs ConfigureServices方法中,将您的自定义AuthorizationHandler添加到服务中,并添加您的Policy。

        services.AddSingleton<IAuthorizationHandler, PermissionAuthorizationHandler>();

        services.AddAuthorization(options =>
        {
            options.AddPolicy("Permission", policyBuilder =>
            {
                policyBuilder.Requirements.Add(new PermissionAuthorizationRequirement());
            });
        });

现在你可以简单地用你的自定义属性装饰你的控制器和动作。

[Permission("AccessCustomers")]
public class CustomersController
{
    [Permission("AddCustomer")]
    IActionResult AddCustomer([FromBody] Customer customer)
    {
        //Add customer
    }
}

其他回答

您可以创建自己的AuthorizationHandler,它将在控制器和动作上找到自定义属性,并将它们传递给handlerrequirementasync方法。

public abstract class AttributeAuthorizationHandler<TRequirement, TAttribute> : AuthorizationHandler<TRequirement> where TRequirement : IAuthorizationRequirement where TAttribute : Attribute
{
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, TRequirement requirement)
    {
        var attributes = new List<TAttribute>();

        var action = (context.Resource as AuthorizationFilterContext)?.ActionDescriptor as ControllerActionDescriptor;
        if (action != null)
        {
            attributes.AddRange(GetAttributes(action.ControllerTypeInfo.UnderlyingSystemType));
            attributes.AddRange(GetAttributes(action.MethodInfo));
        }

        return HandleRequirementAsync(context, requirement, attributes);
    }

    protected abstract Task HandleRequirementAsync(AuthorizationHandlerContext context, TRequirement requirement, IEnumerable<TAttribute> attributes);

    private static IEnumerable<TAttribute> GetAttributes(MemberInfo memberInfo)
    {
        return memberInfo.GetCustomAttributes(typeof(TAttribute), false).Cast<TAttribute>();
    }
}

然后你可以在你的控制器或动作上使用它的任何自定义属性。例如,添加权限要求。只需创建您的自定义属性。

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true)]
public class PermissionAttribute : AuthorizeAttribute
{
    public string Name { get; }

    public PermissionAttribute(string name) : base("Permission")
    {
        Name = name;
    }
}

然后创建一个需求,添加到您的策略

public class PermissionAuthorizationRequirement : IAuthorizationRequirement
{
    //Add any custom requirement properties if you have them
}

然后为您的自定义属性创建AuthorizationHandler,继承我们之前创建的AttributeAuthorizationHandler。它将被传递一个IEnumerable,用于handlerrequirementsasync方法中的所有自定义属性,这些属性是由控制器和动作积累而来的。

public class PermissionAuthorizationHandler : AttributeAuthorizationHandler<PermissionAuthorizationRequirement, PermissionAttribute>
{
    protected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, PermissionAuthorizationRequirement requirement, IEnumerable<PermissionAttribute> attributes)
    {
        foreach (var permissionAttribute in attributes)
        {
            if (!await AuthorizeAsync(context.User, permissionAttribute.Name))
            {
                return;
            }
        }

        context.Succeed(requirement);
    }

    private Task<bool> AuthorizeAsync(ClaimsPrincipal user, string permission)
    {
        //Implement your custom user permission logic here
    }
}

最后,在Startup.cs ConfigureServices方法中,将您的自定义AuthorizationHandler添加到服务中,并添加您的Policy。

        services.AddSingleton<IAuthorizationHandler, PermissionAuthorizationHandler>();

        services.AddAuthorization(options =>
        {
            options.AddPolicy("Permission", policyBuilder =>
            {
                policyBuilder.Requirements.Add(new PermissionAuthorizationRequirement());
            });
        });

现在你可以简单地用你的自定义属性装饰你的控制器和动作。

[Permission("AccessCustomers")]
public class CustomersController
{
    [Permission("AddCustomer")]
    IActionResult AddCustomer([FromBody] Customer customer)
    {
        //Add customer
    }
}

下面的代码适合我在。net Core 5中使用

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class AccessAuthorizationAttribute : AuthorizeAttribute, IAuthorizationFilter
{
    public string Module { get; set; } //Permission string to get from controller

    public AccessAuthorizationAttribute(string module)
    {
        Module = module;
    }
    public void OnAuthorization(AuthorizationFilterContext context)
    {
        //Validate if any permissions are passed when using attribute at controller or action level

        if (string.IsNullOrEmpty(Module))
        {
            //Validation cannot take place without any permissions so returning unauthorized
            context.Result = new UnauthorizedResult();
            return;
        }
       
        if (hasAccess)
        {
            return;
        }

        context.Result = new UnauthorizedResult();
        return;
    }
}

我有不记名令牌,我可以阅读索赔。 我在控制器和动作上使用该属性

public class CustomAuthorizationAttribute : ActionFilterAttribute
{
    public string[] Claims;

    public override void OnActionExecuting(ActionExecutingContext context)
    {
        // check user 
        var contextUser = context?.HttpContext?.User;
        if (contextUser == null)
        {
            throw new BusinessException("Forbidden");
        }


        // check roles
        var roles = contextUser.FindAll("http://schemas.microsoft.com/ws/2008/06/identity/claims/role").Select(c => c.Value).ToList();
        if (!roles.Any(s => Claims.Contains(s)))
        {
            throw new BusinessException("Forbidden");
        }

        base.OnActionExecuting(context);
    }
}

例子

[CustomAuthorization(Claims = new string[]
    {
        nameof(AuthorizationRole.HR_ADMIN),
        nameof(AuthorizationRole.HR_SETTING)
    })]
[Route("api/[controller]")]
[ApiController]
public class SomeAdminController : ControllerBase
{
    private readonly IMediator _mediator;

    public SomeAdminController(IMediator mediator)
    {
        _mediator = mediator;
    }

    [HttpGet("list/SomeList")]
    public async Task<IActionResult> SomeList()
        => Ok(await _mediator.Send(new SomeListQuery()));
}

这就是角色

public struct AuthorizationRole
{
    public static string HR_ADMIN;
    public static string HR_SETTING;
}

在写这篇文章时,我相信这可以用asp.net core 2及以上的iclaimstrtransform接口来完成。我刚刚实现了一个概念的证明,可以分享到这里。

public class PrivilegesToClaimsTransformer : IClaimsTransformation
{
    private readonly IPrivilegeProvider privilegeProvider;
    public const string DidItClaim = "http://foo.bar/privileges/resolved";

    public PrivilegesToClaimsTransformer(IPrivilegeProvider privilegeProvider)
    {
        this.privilegeProvider = privilegeProvider;
    }

    public async Task<ClaimsPrincipal> TransformAsync(ClaimsPrincipal principal)
    {
        if (principal.Identity is ClaimsIdentity claimer)
        {
            if (claimer.HasClaim(DidItClaim, bool.TrueString))
            {
                return principal;
            }

            var privileges = await this.privilegeProvider.GetPrivileges( ... );
            claimer.AddClaim(new Claim(DidItClaim, bool.TrueString));

            foreach (var privilegeAsRole in privileges)
            {
                claimer.AddClaim(new Claim(ClaimTypes.Role /*"http://schemas.microsoft.com/ws/2008/06/identity/claims/role" */, privilegeAsRole));
            }
        }

        return principal;
    }
}

要在你的控制器中使用它,只需在你的方法中添加适当的[授权(角色="whatever")]。

[HttpGet]
[Route("poc")]
[Authorize(Roles = "plugh,blast")]
public JsonResult PocAuthorization()
{
    var result = Json(new
    {
        when = DateTime.UtcNow,
    });

    result.StatusCode = (int)HttpStatusCode.OK;

    return result;
}

在我们的例子中,每个请求都包含一个JWT的授权标头。这是原型,我相信下周我们会在我们的生产系统中做一些非常接近的东西。

未来的选民,在投票时,请考虑投票日期。到今天为止,这在我的机器上还能用。您可能需要在实现上进行更多的错误处理和日志记录。

为了在我们的应用程序中进行授权。我们必须根据在授权属性中传递的参数调用服务。

例如,如果我们想检查登录的医生是否可以查看病人的预约,我们将传递“View_Appointment”到自定义授权属性,并在DB服务中检查该权利,并根据结果进行审查。下面是这个场景的代码:

    public class PatientAuthorizeAttribute : TypeFilterAttribute
    {
    public PatientAuthorizeAttribute(params PatientAccessRights[] right) : base(typeof(AuthFilter)) //PatientAccessRights is an enum
    {
        Arguments = new object[] { right };
    }

    private class AuthFilter : IActionFilter
    {
        PatientAccessRights[] right;

        IAuthService authService;

        public AuthFilter(IAuthService authService, PatientAccessRights[] right)
        {
            this.right = right;
            this.authService = authService;
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
        }

        public void OnActionExecuting(ActionExecutingContext context)
        {
            var allparameters = context.ActionArguments.Values;
            if (allparameters.Count() == 1)
            {
                var param = allparameters.First();
                if (typeof(IPatientRequest).IsAssignableFrom(param.GetType()))
                {
                    IPatientRequest patientRequestInfo = (IPatientRequest)param;
                    PatientAccessRequest userAccessRequest = new PatientAccessRequest();
                    userAccessRequest.Rights = right;
                    userAccessRequest.MemberID = patientRequestInfo.PatientID;
                    var result = authService.CheckUserPatientAccess(userAccessRequest).Result; //this calls DB service to check from DB
                    if (result.Status == ReturnType.Failure)
                    {
                        //TODO: return apirepsonse
                        context.Result = new StatusCodeResult((int)System.Net.HttpStatusCode.Forbidden);
                    }
                }
                else
                {
                    throw new AppSystemException("PatientAuthorizeAttribute not supported");
                }
            }
            else
            {
                throw new AppSystemException("PatientAuthorizeAttribute not supported");
            }
        }
    }
}

在API操作中,我们像这样使用它:

    [PatientAuthorize(PatientAccessRights.PATIENT_VIEW_APPOINTMENTS)] //this is enum, we can pass multiple
    [HttpPost]
    public SomeReturnType ViewAppointments()
    {

    }