Forms login and friendly url

Sometimes (often) you need to switch the default EPiServer login page (~/util/login.aspx) with one of your own. And using EPiServer, sometimes you would like to use an EPiServer page (friendly url and all) as the login page. This can pose something of a problem.

This is caused by a combination of the Login control and the AuthenticationConfig (internal static class) which contains a method, that will do a string comparison on FormsAuthentication.LoginUrl  and Context.Request.Path (which will be the filename of the page).

To overcome this, you can for instance do…

<asp:Login ID="LoginControl" runat="server" OnLoggedIn="LoggedIn" />

And then in codebehind…

protected void LoggedIn(object sender, EventArgs e)
{
    Response.Redirect(GetRedirectUrl(), true);
}

private string GetRedirectUrl()
{
    string returnUrl = FormsAuthentication.GetRedirectUrl(string.Empty, false);

    if (!string.IsNullOrEmpty(returnUrl))
    {
        return returnUrl;
    }

    string str2 = LoginControl.DestinationPageUrl;

    if (!string.IsNullOrEmpty(str2))
    {
        return base.ResolveClientUrl(str2);
    }

    return FormsAuthentication.DefaultUrl;
}

Now your page will beautifylly redirect.