refreshTokenWithAssertion Permission Denied - google-oauth

Question

I am trying to use google-api-client in PHP for a project.
I got a "permission denied" response while at this statement:
$client->getAuth()->refreshTokenWithAssertion();
Google_IO_Exception, Message:Failed to connect to 74.125.193.84: Permission denied
File: /home/www/blah.com/restful/libs/Google/IO/Curl.php
Line:81
/home/www/blah.com/restful/libs/Google/IO/Abstract.php(125): Google_IO_Curl->executeRequest(Object(Google_Http_Request))
#1 /home/www/blah.com/restful/libs/Google/Auth/OAuth2.php(326): Google_IO_Abstract->makeRequest(Object(Google_Http_Request))
#2 /home/www/blah.com/restful/libs/Google/Auth/OAuth2.php(306): Google_Auth_OAuth2->refreshTokenRequest(Array)
#3 /home/www/blah.com/restful/v2/index.php(122): Google_Auth_OAuth2->refreshTokenWithAssertion()
I checked all my credentials and they look correct, what could be the problem?
Thanks,
John
code:
$client_id = '1234blahblahblah.apps.googleusercontent.com'; //Client ID
$service_account_name = '1234blahblah#developer.gserviceaccount.com'; //Email Address
$key_file_location = 'blahblah-1234.p12'; //key.p12
$client = new Google_Client();
$client->setApplicationName("test");
$service = new Google_Service_Calendar($client);
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/calendar'),
$key
);
print_r($cred);
$client->setAssertionCredentials($cred);
$client->setClientId($client_id);
if($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion(); //<<<<<failed here.
}
$_SESSION['service_token'] = $client->getAccessToken();
echo $_SESSION['service_token'];
}

Answer 1

Hi John I´ve the same problem and finally this works for me:
Before the lines:
if($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion(); //<<<<<failed here.
}
I put a try catch and that returns me that I had a writtin permissions problem:
try {
$client->getAuth()->refreshTokenWithAssertion($cred);
} catch (Exception $e) {
var_dump($e->getMessage());
}
I could do 2 things:
1) Go to Google/src/Config.php and change line 94: 'directory' => sys_get_temp_dir() . '/Google_Client'and change the directory to save cache temp files
2) or like me, made a echo sys_get_temp_dir(); before the try catch and give a chmod 777 permission to that dir
This solution works for me, I hope also for you. Anyway made an try/catch waiting for the exception message

Answer 2

See the service-account.php sample in the examples/ directory of the Google APIs Client Library for PHP on Github.com:
if($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion($cred); // set credentials there
}