require __DIR__ . '/vendor/autoload.php';

use League\OAuth2\Client\Provider\Google;

session_start(); // Remove if session.auto_start=1 in php.ini

$provider = new Google([
    'clientId'     => '{google-client-id}',
    'clientSecret' => '{google-client-secret}',
    'redirectUri'  => 'https://example.com/callback-url',
    'hostedDomain' => 'example.com', // optional; used to restrict access to users on your G Suite/Google Apps for Business accounts
]);

if (!empty($_GET['error'])) {

    // Got an error, probably user denied access
    exit('Got error: ' . htmlspecialchars($_GET['error'], ENT_QUOTES, 'UTF-8'));

} elseif (empty($_GET['code'])) {

    // If we don't have an authorization code then get one
    $authUrl = $provider->getAuthorizationUrl();
    $_SESSION['oauth2state'] = $provider->getState();
    header('Location: ' . $authUrl);
    exit;

} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {

    // State is invalid, possible CSRF attack in progress
    unset($_SESSION['oauth2state']);
    exit('Invalid state');

} else {

    // Try to get an access token (using the authorization code grant)
    $token = $provider->getAccessToken('authorization_code', [
        'code' => $_GET['code']
    ]);

    // Optional: Now you have a token you can look up a users profile data
    try {

        // We got an access token, let's now get the owner details
        $ownerDetails = $provider->getResourceOwner($token);

        // Use these details to create a new profile
        printf('Hello %s!', $ownerDetails->getFirstName());

    } catch (Exception $e) {

        // Failed to get user details
        exit('Something went wrong: ' . $e->getMessage());

    }

    // Use this to interact with an API on the users behalf
    echo $token->getToken();

    // Use this to get a new access token if the old one expires
    echo $token->getRefreshToken();

    // Unix timestamp at which the access token expires
    echo $token->getExpires();
}

/** @var League\OAuth2\Client\Token\AccessToken $token */
$values = $token->getValues();

/** @var string */
$jwt = $values['id_token'];

use League\OAuth2\Client\Provider\Google;

$provider = new Google([
    'clientId'     => '{google-client-id}',
    'clientSecret' => '{google-client-secret}',
    'redirectUri'  => 'https://example.com/callback-url',
    'accessType'   => 'offline',
]);

$token = $provider->getAccessToken('authorization_code', [
    'code' => $code
]);

// persist the token in a database
$refreshToken = $token->getRefreshToken();

$authUrl = $provider->getAuthorizationUrl(['prompt' => 'consent', 'access_type' => 'offline']);

use League\OAuth2\Client\Provider\Google;
use League\OAuth2\Client\Grant\RefreshToken;

$provider = new Google([
    'clientId'     => '{google-client-id}',
    'clientSecret' => '{google-client-secret}',
    'redirectUri'  => 'https://example.com/callback-url',
]);

$grant = new RefreshToken();
$token = $provider->getAccessToken($grant, ['refresh_token' => $refreshToken]);

$authorizationUrl = $provider->getAuthorizationUrl([
    'scope' => [
        'scope-url-here'
    ],
]);