Code Samples: Login to your site using google account php

Saturday, April 20, 2013

Login to your site using google account php

Step 1:
Create a Google APIs Console Account

Step 2:
Download php library

Step 3:
Write the following code to a php file:

<?php
session_start();
require_once './src/Google_Client.php';
require_once './src/contrib/Google_Oauth2Service.php';
$baseURL = "http://localhost/lightopenid/";
$client = new Google_Client();
$client->setApplicationName("Google User Info PHP Starter Application");
// Visit https://code.google.com/apis/console?api=plus to generate your
// oauth2_client_id, oauth2_client_secret, and to register your oauth2_redirect_uri.
$client->setClientId('rtrt.apps.googleusercontent.com');
$client->setClientSecret('RInoMtVa_rtrt-EQ2');
$client->setRedirectUri('http://localhost/lightopenid/');

$oauth2 = new Google_Oauth2Service($client);

if (isset($_GET['code'])) {
    $client->authenticate($_GET['code']);
    $_SESSION['token'] = $client->getAccessToken();
    header('Location: ' . filter_var($baseURL, FILTER_SANITIZE_URL));
    return;
}
if (isset($_SESSION['token'])) {
    $client->setAccessToken($_SESSION['token']);
}

if (isset($_REQUEST['logout'])) {
    unset($_SESSION['token']);
    $client->revokeToken();
}

if ($client->getAccessToken()) {
    $user = $oauth2->userinfo->get();

    // These fields are currently filtered through the PHP sanitize filters.
    // See http://www.php.net/manual/en/filter.filters.sanitize.php
    $email = filter_var($user['email'], FILTER_SANITIZE_EMAIL);
    $img = filter_var($user['picture'], FILTER_VALIDATE_URL);
    $personMarkup = "$email<div><img src='$img?sz=50'></div>";

    // The access token may have been updated lazily.
    $_SESSION['token'] = $client->getAccessToken();
} else {
    $authUrl = $client->createAuthUrl();
}
?>
<!doctype html>
<html>
<head><meta charset="utf-8"></head>
<body>
<header><h1>Google UserInfo Sample App</h1></header>
<?php if(isset($personMarkup)): ?>
<?php print $personMarkup ?>
<?php endif ?>
<?php
  if(isset($authUrl)) {
    print "<a class='login' href='$authUrl'>Connect Me!</a>";
  } else {
   print "<a class='logout' href='?logout'>Logout</a>";
  }
?>
</body></html>

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Saturday, April 20, 2013

Login to your site using google account php

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