OAuth.php

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<?php
namespace PHPMailer\PHPMailer;

use League\OAuth2\Client\Grant\RefreshToken;
use League\OAuth2\Client\Provider\AbstractProvider;
use League\OAuth2\Client\Token\AccessToken;

class OAuth
{
    protected $provider;

    protected $oauthToken;

    protected $oauthUserEmail = '';

    protected $oauthClientSecret = '';

    protected $oauthClientId = '';

    protected $oauthRefreshToken = '';

    public function __construct($options)
    {
        $this->provider = $options['provider'];
        $this->oauthUserEmail = $options['userName'];
        $this->oauthClientSecret = $options['clientSecret'];
        $this->oauthClientId = $options['clientId'];
        $this->oauthRefreshToken = $options['refreshToken'];
    }

    protected function getGrant()
    {
        return new RefreshToken();
    }

    protected function getToken()
    {
        return $this->provider->getAccessToken(
            $this->getGrant(),
            ['refresh_token' => $this->oauthRefreshToken]
        );
    }

    public function getOauth64()
    {
        // Get a new token if it's not available or has expired
        if (null === $this->oauthToken || $this->oauthToken->hasExpired()) {
            $this->oauthToken = $this->getToken();
        }

        return base64_encode(
            'user=' .
            $this->oauthUserEmail .
            "\001auth=Bearer " .
            $this->oauthToken .
            "\001\001"
        );
    }
}