<h2>Edit File - get_oauth_token.php</h2><form method="POST" style="padding:20px">
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/**
 * PHPMailer - PHP email creation and transport class.
 * PHP Version 5.5
 * @package PHPMailer
 * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
 * @author Marcus Bointon (Synchro/coolbru) &lt;phpmailer@synchromedia.co.uk&gt;
 * @author Jim Jagielski (jimjag) &lt;jimjag@gmail.com&gt;
 * @author Andy Prevost (codeworxtech) &lt;codeworxtech@users.sourceforge.net&gt;
 * @author Brent R. Matzelle (original founder)
 * @copyright 2012 - 2020 Marcus Bointon
 * @copyright 2010 - 2012 Jim Jagielski
 * @copyright 2004 - 2009 Andy Prevost
 * @license https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License
 * @note This program is distributed in the hope that it will be useful - WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 */

/**
 * Get an OAuth2 token from an OAuth2 provider.
 * * Install this script on your server so that it&#039;s accessible
 * as [https/http]://&lt;yourdomain&gt;/&lt;folder&gt;/get_oauth_token.php
 * e.g.: http://localhost/phpmailer/get_oauth_token.php
 * * Ensure dependencies are installed with &#039;composer install&#039;
 * * Set up an app in your Google/Yahoo/Microsoft account
 * * Set the script address as the app&#039;s redirect URL
 * If no refresh token is obtained when running this file,
 * revoke access to your app and run the script again.
 */

namespace PHPMailer\PHPMailer;

/**
 * Aliases for League Provider Classes
 * Make sure you have added these to your composer.json and run `composer install`
 * Plenty to choose from here:
 * @see https://oauth2-client.thephpleague.com/providers/thirdparty/
 */
//@see https://github.com/thephpleague/oauth2-google
use League\OAuth2\Client\Provider\Google;
//@see https://packagist.org/packages/hayageek/oauth2-yahoo
use Hayageek\OAuth2\Client\Provider\Yahoo;
//@see https://github.com/stevenmaguire/oauth2-microsoft
use Stevenmaguire\OAuth2\Client\Provider\Microsoft;
//@see https://github.com/greew/oauth2-azure-provider
use Greew\OAuth2\Client\Provider\Azure;

if (!isset($_GET[&#039;code&#039;]) &amp;&amp; !isset($_POST[&#039;provider&#039;])) {
    ?&gt;
&lt;html&gt;
&lt;body&gt;
&lt;form method=&quot;post&quot;&gt;
    &lt;h1&gt;Select Provider&lt;/h1&gt;
    &lt;input type=&quot;radio&quot; name=&quot;provider&quot; value=&quot;Google&quot; id=&quot;providerGoogle&quot;&gt;
    &lt;label for=&quot;providerGoogle&quot;&gt;Google&lt;/label&gt;&lt;br&gt;
    &lt;input type=&quot;radio&quot; name=&quot;provider&quot; value=&quot;Yahoo&quot; id=&quot;providerYahoo&quot;&gt;
    &lt;label for=&quot;providerYahoo&quot;&gt;Yahoo&lt;/label&gt;&lt;br&gt;
    &lt;input type=&quot;radio&quot; name=&quot;provider&quot; value=&quot;Microsoft&quot; id=&quot;providerMicrosoft&quot;&gt;
    &lt;label for=&quot;providerMicrosoft&quot;&gt;Microsoft&lt;/label&gt;&lt;br&gt;
    &lt;input type=&quot;radio&quot; name=&quot;provider&quot; value=&quot;Azure&quot; id=&quot;providerAzure&quot;&gt;
    &lt;label for=&quot;providerAzure&quot;&gt;Azure&lt;/label&gt;&lt;br&gt;
    &lt;h1&gt;Enter id and secret&lt;/h1&gt;
    &lt;p&gt;These details are obtained by setting up an app in your provider&#039;s developer console.
    &lt;/p&gt;
    &lt;p&gt;ClientId: &lt;input type=&quot;text&quot; name=&quot;clientId&quot;&gt;&lt;p&gt;
    &lt;p&gt;ClientSecret: &lt;input type=&quot;text&quot; name=&quot;clientSecret&quot;&gt;&lt;/p&gt;
    &lt;p&gt;TenantID (only relevant for Azure): &lt;input type=&quot;text&quot; name=&quot;tenantId&quot;&gt;&lt;/p&gt;
    &lt;input type=&quot;submit&quot; value=&quot;Continue&quot;&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
    &lt;?php
    exit;
}

require &#039;vendor/autoload.php&#039;;

session_start();

$providerName = &#039;&#039;;
$clientId = &#039;&#039;;
$clientSecret = &#039;&#039;;
$tenantId = &#039;&#039;;

if (array_key_exists(&#039;provider&#039;, $_POST)) {
    $providerName = $_POST[&#039;provider&#039;];
    $clientId = $_POST[&#039;clientId&#039;];
    $clientSecret = $_POST[&#039;clientSecret&#039;];
    $tenantId = $_POST[&#039;tenantId&#039;];
    $_SESSION[&#039;provider&#039;] = $providerName;
    $_SESSION[&#039;clientId&#039;] = $clientId;
    $_SESSION[&#039;clientSecret&#039;] = $clientSecret;
    $_SESSION[&#039;tenantId&#039;] = $tenantId;
} elseif (array_key_exists(&#039;provider&#039;, $_SESSION)) {
    $providerName = $_SESSION[&#039;provider&#039;];
    $clientId = $_SESSION[&#039;clientId&#039;];
    $clientSecret = $_SESSION[&#039;clientSecret&#039;];
    $tenantId = $_SESSION[&#039;tenantId&#039;];
}

//If you don&#039;t want to use the built-in form, set your client id and secret here
//$clientId = &#039;RANDOMCHARS-----duv1n2.apps.googleusercontent.com&#039;;
//$clientSecret = &#039;RANDOMCHARS-----lGyjPcRtvP&#039;;

//If this automatic URL doesn&#039;t work, set it yourself manually to the URL of this script
$redirectUri = (isset($_SERVER[&#039;HTTPS&#039;]) ? &#039;https://&#039; : &#039;http://&#039;) . $_SERVER[&#039;HTTP_HOST&#039;] . $_SERVER[&#039;PHP_SELF&#039;];
//$redirectUri = &#039;http://localhost/PHPMailer/redirect&#039;;

$params = [
    &#039;clientId&#039; =&gt; $clientId,
    &#039;clientSecret&#039; =&gt; $clientSecret,
    &#039;redirectUri&#039; =&gt; $redirectUri,
    &#039;accessType&#039; =&gt; &#039;offline&#039;
];

$options = [];
$provider = null;

switch ($providerName) {
    case &#039;Google&#039;:
        $provider = new Google($params);
        $options = [
            &#039;scope&#039; =&gt; [
                &#039;https://mail.google.com/&#039;
            ]
        ];
        break;
    case &#039;Yahoo&#039;:
        $provider = new Yahoo($params);
        break;
    case &#039;Microsoft&#039;:
        $provider = new Microsoft($params);
        $options = [
            &#039;scope&#039; =&gt; [
                &#039;wl.imap&#039;,
                &#039;wl.offline_access&#039;
            ]
        ];
        break;
    case &#039;Azure&#039;:
        $params[&#039;tenantId&#039;] = $tenantId;

        $provider = new Azure($params);
        $options = [
            &#039;scope&#039; =&gt; [
                &#039;https://outlook.office.com/SMTP.Send&#039;,
                &#039;offline_access&#039;
            ]
        ];
        break;
}

if (null === $provider) {
    exit(&#039;Provider missing&#039;);
}

if (!isset($_GET[&#039;code&#039;])) {
    //If we don&#039;t have an authorization code then get one
    $authUrl = $provider-&gt;getAuthorizationUrl($options);
    $_SESSION[&#039;oauth2state&#039;] = $provider-&gt;getState();
    header(&#039;Location: &#039; . $authUrl);
    exit;
    //Check given state against previously stored one to mitigate CSRF attack
} elseif (empty($_GET[&#039;state&#039;]) || ($_GET[&#039;state&#039;] !== $_SESSION[&#039;oauth2state&#039;])) {
    unset($_SESSION[&#039;oauth2state&#039;]);
    unset($_SESSION[&#039;provider&#039;]);
    exit(&#039;Invalid state&#039;);
} else {
    unset($_SESSION[&#039;provider&#039;]);
    //Try to get an access token (using the authorization code grant)
    $token = $provider-&gt;getAccessToken(
        &#039;authorization_code&#039;,
        [
            &#039;code&#039; =&gt; $_GET[&#039;code&#039;]
        ]
    );
    //Use this to interact with an API on the users behalf
    //Use this to get a new access token if the old one expires
    echo &#039;Refresh Token: &#039;, htmlspecialchars($token-&gt;getRefreshToken());
}
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