/// <summary>
/// If the request is SPA request, we need to verify that the page contains the same SpaContentPlaceHolder.
/// Also we need to check that the placeholder is the same.
/// </summary>
protected void VerifySpaRequest(IDotvvmRequestContext context, DotvvmView page)
{
if (context.IsSpaRequest)
{
var spaContentPlaceHolders = page.GetAllDescendants().OfType <SpaContentPlaceHolder>().ToList();
if (spaContentPlaceHolders.Count > 1)
{
throw new Exception("Multiple controls of type <dot:SpaContentPlaceHolder /> found on the page! This control can be used only once!"); // TODO: exception handling
}
if (spaContentPlaceHolders.Count == 0 || spaContentPlaceHolders[0].GetSpaContentPlaceHolderUniqueId() != context.GetSpaContentPlaceHolderUniqueId())
{
// the client has loaded different page which does not contain current SpaContentPlaceHolder - he needs to be redirected
context.RedirectToUrl(context.HttpContext.Request.Url.AbsoluteUri.Replace("/" + HostingConstants.SpaUrlIdentifier, ""));
}
}
}