Google Analytics API - problems with refreshing token - php

Question

I'm writing a Wordpress plugin which displays visits on a page. Everything's done and it works perfectly... for an hour. I can't refresh the token when it expires, so the end-user can't see Analytics results. I don't know what am I doing wrong, maybe I misunderstood the authentication process.
This is how I manage the first connection to the API:
$client->setClientId(get_option('client_ID'));
$client->setClientSecret(get_option('client_secret'));
$client->setRedirectUri(get_option('redirectURI'));
$client->setScopes(array('https://www.googleapis.com/auth/analytics.readonly'));
$client->setAccessType('offline');
$authUrl = $client->createAuthUrl();
print "<a class='login' href='$authUrl'><button>Authorize Google</button></a>";
And then i do this:
try {
if (isset($_GET['code'])) {
$client->authenticate();
$_SESSION['token'] = $client->getAccessToken();
update_option('token', $_SESSION['token']);
$tok = json_decode($_SESSION['token']);
update_option('refresh_token', $tok->refresh_token);
$redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
?><script type="text/javascript">
window.location="<?php filter_var($redirect, FILTER_SANITIZE_URL)?>";
</script><?php
}
if (isset($_SESSION['token'])) {
update_option('token', $_SESSION['token']);
$client->setAccessToken($_SESSION['token']);
}
} catch (Google_AuthException $e){
return FALSE;
}
This works fine. Now here's the part, where it should use the token thats stored as an option and if it expired, use refresh_token to get a new one automatically. Here's the code:
$client = new Google_Client();
$client->setApplicationName('AnalyticsPK Plugin for Wordpress');
$client->setClientId(get_option('client_ID'));
$client->setClientSecret(get_option('client_secret'));
$client->setRedirectUri(get_option('redirectURI'));
$client->setScopes(array('https://www.googleapis.com/auth/analytics.readonly'));
$client->setAccessType('offline');
$client->setApprovalPrompt("force");
echo "Token: ".get_option('token')."<br>";
echo "Refresh token: ".get_option('refresh_token')."<br>";
$client->setAccessToken(get_option('token'));
if ($client->isAccessTokenExpired()){
echo "Token expired <br>";
$client->refreshToken(get_option('refresh_token'));
echo "New token: ".$client->getAccessToken();
}
//echo "Token: ".get_option('token');
//echo "Refresh token: ".get_option('refresh_token');
// Magic. Returns objects from the Analytics Service instead of associative arrays.
$client->setUseObjects(true);
$analytics = new Google_AnalyticsService($client);
When the token expiration time passes, I get an error:
Fatal error: Uncaught exception 'Google_AuthException' with message
'Error refreshing the OAuth2 token, message: '{ "error" :
"invalid_request", "error_description" : "Client must specify either
client_id or client_assertion, not both" }'' in
/_wpsu/analytics/wp-content/plugins/AnalyticsPK/google-api-php-client/src/auth/Google_OAuth2.php:288
Stack trace: #0
/_wpsu/analytics/wp-content/plugins/AnalyticsPK/google-api-php-client/src/auth/Google_OAuth2.php(248):
Google_OAuth2->refreshTokenRequest(Array) #1
/_wpsu/analytics/wp-content/plugins/AnalyticsPK/google-api-php-client/src/Google_Client.php(311):
Google_OAuth2->refreshToken('1/XCyf8ofh6H3kL...') #2
/_wpsu/analytics/wp-content/plugins/AnalyticsPK/AnalyticsPK.php(90):
Google_Client->refreshToken('1/XCyf8ofh6H3kL...') #3
/_wpsu/analytics/wp-includes/widgets.php(182):
AnalyticsPK->widget(Array, Array) #4 [internal function]:
WP_Widget->display_callback(Array, Array) #5
/_wpsu/analytics/wp-includes/widgets.php(895):
call_user_func_array(Array, Array) #6 /_wpsu/analytics/ in
/_wpsu/analytics/wp-content/plugins/AnalyticsPK/google-api-php-client/src/auth/Google_OAuth2.php
on line 288
What am I doing wrong with refreshing the token?