Fetch latest files from Google Drive using PHP

fetch-files-google-drive.php

<?php

// Display erros if any on the page.
error_reporting(E_ALL);
ini_set("display_errors", 1);
session_start();

if(isset($_GET['action']) and $_GET['action'] == 'logout'){

	unset($_SESSION['accessToken']);
	$redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
  	header('Location: ' . filter_var($redirect, FILTER_SANITIZE_URL));
}

// Autoload Drive SDK
require 'lib/google-api-php-client/src/Google/autoload.php';

define('APPLICATION_NAME', 'Project Default Service Account');
define('CLIENT_SECRET_PATH', 'client_secret.json');
define('SCOPES', implode(' ', array(
	Google_Service_Drive::DRIVE_METADATA_READONLY)
));

$client = new Google_Client();
$client->setApplicationName(APPLICATION_NAME);
$client->setScopes(SCOPES);
$client->setAuthConfigFile(CLIENT_SECRET_PATH);
$client->setRedirectUri('http://localhost/drive/upload-images.php');
$client->setAccessType('offline');

//formatPre($_SESSION['accessToken']);


if( !isset($_GET['code']) and !isset($_SESSION['accessToken'])) {

	echo '<a target="_self" href="'. $client->createAuthUrl($client) . '">Click here to Authenticate</a>';

}

if( isset($_GET['code'])){

	$accessToken = $client->authenticate($_GET['code']);
	$client->setAccessToken($accessToken);
	$_SESSION['accessToken'] = $accessToken;

}



if(isset($_SESSION['accessToken'])){

	showLogOut();

	if($client->isAccessTokenExpired()){

		//$client->refreshToken($client->getRefreshToken());
		$client->setAccessToken($_SESSION['accessToken']);
	}


	$service = new Google_Service_Drive($client);

	// Print the names and IDs for up to 10 files.
	$optParams = array(
	  'maxResults' => 10,
	);
	$results = $service->files->listFiles($optParams);

	if (count($results->getItems()) == 0) {
	  echo "No files are stored in your Google Drive.\n";
	} else {
	  
	  echo "<br />Files:<br />";

	  foreach ($results->getItems() as $file) {
		echo "File ID => " . $file->getId() . " , Title => " . $file->getTitle() . '<br /><br />';
	  }
	}
} 


function showLogOut(){

	echo '<a target="_self" href="?action=logout">Logout</a>';
}


function formatPre($value){

	echo '<pre>';
	echo $value;
	echo '</pre>';
}

?>