index.php

<?
/*
 * Copyright (C) 2013 Tony Gaitatzis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author: Tony Gaitatzis - http://www.linkedin.com/in/tonygaitatzis
 * This code complements the online tutorial:
 * http://20missionglass.tumblr.com/post/60787835108/programming-an-oauth2-client-app-in-php
 */

require('config.php');

$url = "https://accounts.google.com/o/oauth2/auth";
 
// build the HTTP GET query
$params = array(
    "response_type" => "code",
    "client_id" => $oauth2_client_id,
    "redirect_uri" => $oauth2_redirect,
    "scope" => "https://www.googleapis.com/auth/plus.me"
    );
 
$request_to = $url . '?' . http_build_query($params);
 
// forward the user to the login access page on the OAuth 2 server
header("Location: " . $request_to);

?>