I have downloaded Google APIs Library Client for PHP and am now trying to make a connection with OAuth. However, with the following code in service-account.php:
<?php
/*
* Copyright 2013 Google Inc.
*
* 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.
*/
session_start();
include_once "templates/base.php";
/************************************************
Make an API request authenticated with a service
account.
************************************************/
set_include_path("../src/" . PATH_SEPARATOR . get_include_path());
require_once 'Google/Client.php';
require_once 'Google/Service/Books.php';
/************************************************
ATTENTION: Fill in these values! You can get
them by creating a new Service Account in the
API console. Be sure to store the key file
somewhere you can get to it - though in real
operations you'd want to make sure it wasn't
accessible from the webserver!
The name is the email address value provided
as part of the service account (not your
address!)
Make sure the Books API is enabled on this
account as well, or the call will fail.
************************************************/
$client_id = 'CLIENT-ID-GENERATED-FROM-GOOGLE-DEVELOPERS-CONSOLE.apps.googleusercontent.com';
$service_account_name = 'test';
$key_file_location = 'PRIVATE-KEY-FROM-GOOGLE-DEVELOPERS-CONSOLE-privatekey.p12';
echo pageHeader("Service Account Access");
if ($client_id == '<YOUR_CLIENT_ID>'
|| !strlen($service_account_name)
|| !strlen($key_file_location)) {
echo missingServiceAccountDetailsWarning();
}
$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/analytics.readonly'),
$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', $optParams);
echo "<h3>Results Of Call:</h3>";
foreach ($results as $item) {
echo $item['volumeInfo']['title'], "<br /> \n";
}
echo pageFooter(__FILE__);
I get this error:
Fatal error: Uncaught exception 'Google_Auth_Exception' with message 'Error refreshing the OAuth2 token, message: '{ "error" : "invalid_grant" }'' in /home/texterx1/public_html/google-api-php-client-master/src/Google/Auth/OAuth2.php:327 Stack trace: #0 /home/texterx1/public_html/google-api-php-client-master/src/Google/Auth/OAuth2.php(289): Google_Auth_OAuth2->refreshTokenRequest(Array) #1 /home/texterx1/public_html/google-api-php-client-master/examples/service-account.php(75): Google_Auth_OAuth2->refreshTokenWithAssertion(Object(Google_Auth_AssertionCredentials)) #2 {main} thrown in /home/texterx1/public_html/google-api-php-client-master/src/Google/Auth/OAuth2.php on line 327
What am I doing wrong?
Suspicion
One suspicion I have is that I have copy/pasted the wrong values to $client_id, $service_account_name and $key_file_location. I got $client_id from the field Service account Client ID, $service_account_name I took from Consent screen > product name and $key_file_location from the file name on the .p12 file downloaded to my PC when I clicked to generate a new key below Service Account. I opened the .p12 file on my computer first and followed the guide which did something like importing certificate (not sure if I were supposed to do that).
