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CrudApiFilterAttribute.cs
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CrudApiFilterAttribute.cs
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using System;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Locker.Domain.Features.Auth.Entities;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
namespace Locker.Api.Web.Filters
{
public class CrudApiFilterAttribute : AuthorizeAttribute, IAsyncAuthorizationFilter
{
/// <summary>
/// It can contain placeholders which will be bound from route data. Ex. Users@{userId}
/// </summary>
private readonly string _resourceName;
private readonly ResourceAccessRight _requiredAccessRight;
public CrudApiFilterAttribute(string resourceName, ResourceAccessRight requiredAccessRight)
{
_resourceName = resourceName;
_requiredAccessRight = requiredAccessRight;
}
public Task OnAuthorizationAsync(AuthorizationFilterContext context)
{
var user = context.HttpContext.User;
if (!user.Identity.IsAuthenticated)
{
return Task.CompletedTask;
}
var (rootResource, subResource) = GetResourceName(context);
if (HasAccessToResource(user.Claims.FirstOrDefault(it => it.Type == rootResource)) ||
HasAccessToResource(user.Claims.FirstOrDefault(it => it.Type == subResource)))
{
return Task.CompletedTask;
}
context.Result = new ForbidResult();
return Task.CompletedTask;
}
private bool HasAccessToResource(Claim claim)
{
if (claim == null)
{
return false;
}
var accessRight = (ResourceAccessRight)Enum.Parse(typeof(ResourceAccessRight), claim.Value);
return (accessRight & ResourceAccessRight.All) == ResourceAccessRight.All || (accessRight & _requiredAccessRight) == _requiredAccessRight;
}
/// <summary>
/// When resource requirement has no placeholder, result contains no sub resource.
/// Example. Resource: "Users", Result: (rootResource: "Users", "subResource" : null)
/// When resource requirement has placeholder, result contains sub resource bound to RouteData.
/// Example. Resource: "Users@{userId}", Result: (rootResource: "Users", "subResource" : User@12) where 12 is bound from route data
/// </summary>
private (string rootResource, string subResource) GetResourceName(AuthorizationFilterContext context)
{
if (!_resourceName.Contains("@"))
{
return (_resourceName, null);
}
var resourceName = new StringBuilder(_resourceName);
foreach (Match match in Regex.Matches(_resourceName, @"\{(?<value>\w+)}"))
{
var value = match.Groups["value"].Value;
var routeValue = context.RouteData.Values[value].ToString();
resourceName.Replace(match.Value, routeValue);
}
return (_resourceName.Substring(0, _resourceName.IndexOf("@")), resourceName.ToString());
}
}
}