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<?php
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/**
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 * PHPMailer - PHP email creation and transport class.
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 * PHP Version 5.5.
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 *
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 * @see       https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
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 *
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 * @author    Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
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 * @author    Jim Jagielski (jimjag) <jimjag@gmail.com>
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 * @author    Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
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 * @author    Brent R. Matzelle (original founder)
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 * @copyright 2012 - 2015 Marcus Bointon
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 * @copyright 2010 - 2012 Jim Jagielski
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 * @copyright 2004 - 2009 Andy Prevost
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 * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
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 * @note      This program is distributed in the hope that it will be useful - WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.
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 */
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namespace PHPMailer\PHPMailer;
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use League\OAuth2\Client\Grant\RefreshToken;
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use League\OAuth2\Client\Provider\AbstractProvider;
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use League\OAuth2\Client\Token\AccessToken;
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/**
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 * OAuth - OAuth2 authentication wrapper class.
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 * Uses the oauth2-client package from the League of Extraordinary Packages.
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 *
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 * @see     http://oauth2-client.thephpleague.com
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 *
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 * @author  Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
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 */
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class OAuth
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{
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    /**
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     * An instance of the League OAuth Client Provider.
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     *
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     * @var AbstractProvider
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     */
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    protected $provider;
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    /**
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     * The current OAuth access token.
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     *
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     * @var AccessToken
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     */
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    protected $oauthToken;
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    /**
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     * The user's email address, usually used as the login ID
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     * and also the from address when sending email.
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     *
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     * @var string
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     */
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    protected $oauthUserEmail = '';
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    /**
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     * The client secret, generated in the app definition of the service you're connecting to.
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     *
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     * @var string
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     */
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    protected $oauthClientSecret = '';
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    /**
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     * The client ID, generated in the app definition of the service you're connecting to.
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     *
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     * @var string
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     */
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    protected $oauthClientId = '';
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    /**
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     * The refresh token, used to obtain new AccessTokens.
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     *
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     * @var string
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     */
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    protected $oauthRefreshToken = '';
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    /**
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     * OAuth constructor.
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     *
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     * @param array $options Associative array containing
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     *                       `provider`, `userName`, `clientSecret`, `clientId` and `refreshToken` elements
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     */
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    public function __construct($options)
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    {
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        $this->provider = $options['provider'];
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        $this->oauthUserEmail = $options['userName'];
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        $this->oauthClientSecret = $options['clientSecret'];
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        $this->oauthClientId = $options['clientId'];
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        $this->oauthRefreshToken = $options['refreshToken'];
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    }
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    /**
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     * Get a new RefreshToken.
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     *
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     * @return RefreshToken
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     */
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    protected function getGrant()
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    {
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        return new RefreshToken();
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    }
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    /**
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     * Get a new AccessToken.
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     *
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     * @return AccessToken
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     */
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    protected function getToken()
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    {
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        return $this->provider->getAccessToken(
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            $this->getGrant(),
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            ['refresh_token' => $this->oauthRefreshToken]
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        );
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    }
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    /**
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     * Generate a base64-encoded OAuth token.
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     *
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     * @return string
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     */
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    public function getOauth64()
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    {
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        // Get a new token if it's not available or has expired
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        if (null === $this->oauthToken or $this->oauthToken->hasExpired()) {
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            $this->oauthToken = $this->getToken();
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        }
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        return base64_encode(
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            'user=' .
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            $this->oauthUserEmail .
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            "\001auth=Bearer " .
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            $this->oauthToken .
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            "\001\001"
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        );
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    }
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}