RequestHandler

ResourceAuthorization.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using OpenBlog.Api.Authorization.Requirements;

namespace OpenBlog.Api.Authorization.Handlers
{
    public class ResourceOwnerHandler : AuthorizationHandler<ResourceOwnerRequirement, string>
    {

        protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, ResourceOwnerRequirement requirement,
            string resource)
        {
            if (context.User.HasClaim(claim => 
            claim.Type == "client_id" && claim.Value == resource))
                context.Succeed(requirement);

            return Task.CompletedTask;
        }

    }
}