AntiForgeryToken Expiration Blank Page

Question

I\'m using IdentityServer4 with ASP.NET Core 2.2. On the Post Login method I have applied the ValidateAntiForgeryToken. Generally after 20 minutes to 2 hours of sitting on the l

Answer 1

This was my final solution. I added a attribute using the IAntifogery dependency injection.

public class CustomValidationAttribute : ActionFilterAttribute
{
    private IAntiforgery _antiForgery { get; }

    public CustomValidationAttribute(IAntiforgery antiforgery)
    {
        _antiForgery = antiforgery;
    }

    public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {
        var isRequestValid = await this._antiForgery.IsRequestValidAsync(context.HttpContext);
        if (!isRequestValid)
        {
            //Add Code here if token is not valid

            return;         
        }

        await next();
    }
}

Add the attribute to your controller methods that also use [HttpPost]

[TypeFilter(typeof(CustomValidationAttribute))]