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How to get API key for user using Google's OAuth API?

Maybe I'm not understanding how the Youtube Data API is supposed to work. But if I have a PHP application that will generate the oauth request and receive the callback (which I have), the data it sends back is not a user's API key.

So I don't know if I am doing this wrong, or what, but their documentation is giving me a headache and I have searched and searched and I don't even know if my process is right here:

Web Server / OAuth Request (php)

require_once 'vendor/autoload.php';

$client = new Google_Client();
$client->setAuthConfig('oauth.json');
$client->setAccessType("offline"); // offline access
$client->setIncludeGrantedScopes(true); // incremental auth
$client->addScope(Google_Service_YouTube::YOUTUBE_READONLY);
$client->setRedirectUri('http://' . $_SERVER['HTTP_HOST'] . '/oauth2callback.php');

$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));


Client Authorizes my Application

Google sends back (whatever this is)

'code' => string 'BLABLABLABLABLA' (length=89)
'scope' => string 'https://www.googleapis.com/auth/youtube.readonly https://www.googleapis.com/auth/plus.me https://www.googleapis.com/auth/youtube https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile' (length=224)


Where is the user's API key, how do I get it? Is this not correct, or am I just jumbling stuff up here?

2 Answers
2

You don't get an API key when using OAuth. You get an access token. API key is obtained from a users's Google Developer Console.

Check the PHP Quickstart for a quick Youtube API OAuth reference in PHP.

your oauth2callback.php should look something like this. It will take the code and exchange it for an access token.

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/Oauth2Authentication.php';
// Start a session to persist credentials.
session_start();
// Handle authorization flow from the server.
if (! isset($_GET['code'])) {
$client = buildClient();
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
} else {
$client = buildClient();
$client->authenticate($_GET['code']); // Exchange the authencation code for a refresh token and access token.
// Add access token and refresh token to seession.
$_SESSION['access_token'] = $client->getAccessToken();
$_SESSION['refresh_token'] = $client->getRefreshToken();
//Redirect back to main script
$redirect_uri = str_replace("oauth2callback.php",$_SESSION['mainScript'],$client->getRedirectUri());
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}


Code ripped from my sample project on github

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