requirement.cs

public class IsWeathermanAuthorizationHandler : AuthorizationHandler<IsWeathermanAuthorizationRequirement>
{
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, IsWeathermanAuthorizationRequirement requirement)
    {
        var permission = context.User?.Claims?.FirstOrDefault(x => x.Type == "permissions" && x.Value == requirement.ValidPermission);
        if (permission != null)
            context.Succeed(requirement);
        
        return Task.CompletedTask;
    }
}
public class IsWeathermanAuthorizationRequirement : IAuthorizationRequirement
{
    public string ValidPermission = "read:weather";
}