'; //Client ID
$service_account_name = ''; //Email Address
$key_file_location = ''; //key.p12
echo pageHeader("Service Account Access");
if (strpos($client_id, "googleusercontent") == false
|| !strlen($service_account_name)
|| !strlen($key_file_location)) {
echo missingServiceAccountDetailsWarning();
exit;
}
$client = new Google_Client();
$client->setApplicationName("Client_Library_Examples");
$service = new Google_Service_Books($client);
/************************************************
If we have an access token, we can carry on.
Otherwise, we'll get one with the help of an
assertion credential. In other examples the list
of scopes was managed by the Client, but here
we have to list them manually. We also supply
the service account
************************************************/
if (isset($_SESSION['service_token'])) {
$client->setAccessToken($_SESSION['service_token']);
}
$key = file_get_contents($key_file_location);
$cred = new Google_Auth_AssertionCredentials(
$service_account_name,
array('https://www.googleapis.com/auth/books'),
$key
);
$client->setAssertionCredentials($cred);
if ($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion($cred);
}
$_SESSION['service_token'] = $client->getAccessToken();
/************************************************
We're just going to make the same call as in the
simple query as an example.
************************************************/
$optParams = array('filter' => 'free-ebooks');
$results = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
echo "Results Of Call:
";
foreach ($results as $item) {
echo $item['volumeInfo']['title'], "
\n";
}
echo pageFooter(__FILE__);