Google OAuth: can't get refresh token with authorization code - google-api

Question

I am using Google API Client for Google Analytics with OAuth 2.0
I read this to get the refresh token but it doesn't appears: https://developers.google.com/identity/protocols/OAuth2WebServer#offline
I only get this instead:
{
"access_token": "ya29.twHFi4LsiF-AITwzCpupMmie-fljyTIzD9lG8y_OYUdEGKSDL7vD8LPKIqdzRwvoQAWd",
"token_type": "Bearer",
"expires_in": 3599,
"id_token": "very long string"
}
Here is the code:
Javascript (to get the Authorization Code): that works
gapi.analytics.ready(function() {
gapi.analytics.auth.authorize({
container: 'embed-api-auth-container',
clientid: '257497260674-ji56vq885ohe9cdr1j6u0bcpr6hu7rde.apps.googleusercontent.com',
});
gapi.analytics.auth.on('success', function(response) {
var code = response.code;
$.ajax({
url: "getTokensFromCode.php",
method: "GET",
data: {
"code": code
},
success: function (tokens) {
// I can't get refresh token here, only get "access_token" and "id_token"
console.log(tokens);
}
});
});
});
PHP (to exchange Authorization Code for tokens): that doesn't work
// I get the authorization code in Javascript
$code = $_GET['code'];
$redirectURI = "postmessage";
$client = new Google_Client();
$client->setClientId($clientID);
$client->setClientSecret($clientSecret);
$client->setRedirectUri($redirectURI);
$client->addScope(Google_Service_Analytics::ANALYTICS_READONLY);
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$client->authenticate($code);
$tokens = $client->getAccessToken();
echo $tokens;
I need the refresh token in Javascript, that's why I get the authorization code in Javascript and make an Ajax request to get the refresh token.

Answer 1

You will only get the refresh_token the very first time that a user grants access to your app. You'll need to store the refresh_token somewhere to be able to use it afterwards. You won't get a new refresh token the next time a user logs in to your app.
FWIW: using a refresh token in a Javascript client doesn't make a lot of sense since a Javascript client can't store it in a safe (confidential) way. Since Javascript clients live in browsers and users are present in browsers, you can just redirect the browser to the authorization endpoint again and you'll get a new access token (which is also the purpose of a refresh token). The SSO session for the user at Google will make sure that the user doesn't need to login again and that the experience is seamless.

Answer 2

Check out this response by #curious_coder
Google API Refresh Token
He explains a way to get the Refresh Token every time :) Life saver. This post helped me get there so I figured I'd share this for any one else trying to find their refresh token. Add the last two lines of this code to your Auth process
$client = new Google_Client();
$client->setAuthConfigFile(__DIR__ . '/client_secrets.json');
$client->setRedirectUri('http://' . $_SERVER['HTTP_HOST'] . '/dashboard/oauthcallbacks');
$client->addScope(Google_Service_Analytics::ANALYTICS_READONLY);
$client->setAccessType('offline'); //To fetch refresh token(Refresh token issued only first time)
$client->setApprovalPrompt('force'); //Adding this will force for refresh token
Also I used var_dump($tokens) to get the contents instead of echo. Dont remember if it makes a difference in PHP but $tokens will be an array of objects.