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   1  <?php
   2  
   3  /**
   4   * PHPMailer - PHP email creation and transport class.
   5   * PHP Version 5.5.
   6   *
   7   * @see       https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
   8   *
   9   * @author    Marcus Bointon (Synchro/coolbru) <[email protected]>
  10   * @author    Jim Jagielski (jimjag) <[email protected]>
  11   * @author    Andy Prevost (codeworxtech) <[email protected]>
  12   * @author    Brent R. Matzelle (original founder)
  13   * @copyright 2012 - 2020 Marcus Bointon
  14   * @copyright 2010 - 2012 Jim Jagielski
  15   * @copyright 2004 - 2009 Andy Prevost
  16   * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
  17   * @note      This program is distributed in the hope that it will be useful - WITHOUT
  18   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19   * FITNESS FOR A PARTICULAR PURPOSE.
  20   */
  21  
  22  namespace PHPMailer\PHPMailer;
  23  
  24  use League\OAuth2\Client\Grant\RefreshToken;
  25  use League\OAuth2\Client\Provider\AbstractProvider;
  26  use League\OAuth2\Client\Token\AccessToken;
  27  
  28  /**
  29   * OAuth - OAuth2 authentication wrapper class.
  30   * Uses the oauth2-client package from the League of Extraordinary Packages.
  31   *
  32   * @see     http://oauth2-client.thephpleague.com
  33   *
  34   * @author  Marcus Bointon (Synchro/coolbru) <[email protected]>
  35   */
  36  class OAuth implements OAuthTokenProvider
  37  {
  38      /**
  39       * An instance of the League OAuth Client Provider.
  40       *
  41       * @var AbstractProvider
  42       */
  43      protected $provider;
  44  
  45      /**
  46       * The current OAuth access token.
  47       *
  48       * @var AccessToken
  49       */
  50      protected $oauthToken;
  51  
  52      /**
  53       * The user's email address, usually used as the login ID
  54       * and also the from address when sending email.
  55       *
  56       * @var string
  57       */
  58      protected $oauthUserEmail = '';
  59  
  60      /**
  61       * The client secret, generated in the app definition of the service you're connecting to.
  62       *
  63       * @var string
  64       */
  65      protected $oauthClientSecret = '';
  66  
  67      /**
  68       * The client ID, generated in the app definition of the service you're connecting to.
  69       *
  70       * @var string
  71       */
  72      protected $oauthClientId = '';
  73  
  74      /**
  75       * The refresh token, used to obtain new AccessTokens.
  76       *
  77       * @var string
  78       */
  79      protected $oauthRefreshToken = '';
  80  
  81      /**
  82       * OAuth constructor.
  83       *
  84       * @param array $options Associative array containing
  85       *                       `provider`, `userName`, `clientSecret`, `clientId` and `refreshToken` elements
  86       */
  87      public function __construct($options)
  88      {
  89          $this->provider = $options['provider'];
  90          $this->oauthUserEmail = $options['userName'];
  91          $this->oauthClientSecret = $options['clientSecret'];
  92          $this->oauthClientId = $options['clientId'];
  93          $this->oauthRefreshToken = $options['refreshToken'];
  94      }
  95  
  96      /**
  97       * Get a new RefreshToken.
  98       *
  99       * @return RefreshToken
 100       */
 101      protected function getGrant()
 102      {
 103          return new RefreshToken();
 104      }
 105  
 106      /**
 107       * Get a new AccessToken.
 108       *
 109       * @return AccessToken
 110       */
 111      protected function getToken()
 112      {
 113          return $this->provider->getAccessToken(
 114              $this->getGrant(),
 115              ['refresh_token' => $this->oauthRefreshToken]
 116          );
 117      }
 118  
 119      /**
 120       * Generate a base64-encoded OAuth token.
 121       *
 122       * @return string
 123       */
 124      public function getOauth64()
 125      {
 126          //Get a new token if it's not available or has expired
 127          if (null === $this->oauthToken || $this->oauthToken->hasExpired()) {
 128              $this->oauthToken = $this->getToken();
 129          }
 130  
 131          return base64_encode(
 132              'user=' .
 133              $this->oauthUserEmail .
 134              "\001auth=Bearer " .
 135              $this->oauthToken .
 136              "\001\001"
 137          );
 138      }
 139  }