A custom Sitecore pipeline processor for the SuccessAction of the WFFM module

SuccessGatedContentRedirect.cs

public class SuccessGatedContentRedirect : ClientPipelineArgs
{
    private List<string> _gatedContentSaveActionIds = new List<string>();

    public void Process(SubmitSuccessArgs args)
    {
        Assert.IsNotNull((object)args, "args");

        if (args.Form != null && !args.Form.SuccessRedirect && FormHasGrantGatedAccessSaveAction(args)))
        {
            string urlString = HttpContext.Current.Request.Url.AbsoluteUri;
            WebUtil.Redirect(urlString, true);
        }
    }

    private bool FormHasGrantGatedAccessSaveAction(SubmitSuccessArgs args)
    {
        bool isGatedForm = false;

        foreach (string gatedContentSaveActionId in _gatedContentSaveActionIds)
        {
            isGatedForm = args.Form.SaveActions.ToLower().Trim().Contains(gatedContentSaveActionId.Trim().ToLower());
            if (isGatedForm)
                break;
        }

        return isGatedForm;
    }

    public void AddGatedContentSaveActionIds(XmlNode configNode)
    {
        Assert.ArgumentNotNull(configNode, "configNode");
        string attributeValue = XmlUtil.GetAttribute("value", configNode);
        _gatedContentSaveActionIds.Add(attributeValue);
    }
}