<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="login.aspx.cs" Inherits="GoogleLogin.login" %>
<%
//if the user logs out, this clears the session and reloads the page.
if (Request.QueryString["logout"] == "yes")
{
Session.Clear();
Response.Redirect("/login.aspx");
}
%>
Google OAuth2 Authentication Demo, by A Better Geek
<%
string code = Request.QueryString["code"];
if (code != null && Session["loggedin"] != "yes")
{
//if there is a "code" value in the querystring and no login session present
//then log in using Google
string client_id = Request.Cookies["client_id"].Value;
string client_secret = Request.Cookies["client_secret"].Value;
string redirect_uri = Request.Cookies["redirect_uri"].Value;
string grant_type = "authorization_code";
//the state token in the return URL needs to be verified first.
string gState = Request["state"];
if (gState == Convert.ToString(Session["state"]))
{
string gurl = "code=" + code + "&client_id=" + client_id +
"&client_secret=" + client_secret + "&redirect_uri=" + redirect_uri + "&grant_type=" + grant_type;
Response.Write(GoogleLogin(gurl));
}
else
{
Response.Write("
Please start over. If you're seeing this message, the session ID verification failed.
");
}
}
else if (Session["loggedin"] == "yes")
{
Response.Write("