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diff --git a/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/XOAuth2Authenticator.php b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/XOAuth2Authenticator.php
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+++ b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/XOAuth2Authenticator.php
@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Handles XOAUTH2 authentication.
+ *
+ * Example:
+ * <code>
+ * $transport = Swift_SmtpTransport::newInstance('smtp.gmail.com', 587, 'tls')
+ * ->setAuthMode('XOAUTH2')
+ * ->setUsername('YOUR_EMAIL_ADDRESS')
+ * ->setPassword('YOUR_ACCESS_TOKEN');
+ * </code>
+ *
+ * @author xu.li<AthenaLightenedMyPath@gmail.com>
+ *
+ * @see https://developers.google.com/google-apps/gmail/xoauth2_protocol
+ */
+class Swift_Transport_Esmtp_Auth_XOAuth2Authenticator implements Swift_Transport_Esmtp_Authenticator
+{
+ /**
+ * Get the name of the AUTH mechanism this Authenticator handles.
+ *
+ * @return string
+ */
+ public function getAuthKeyword()
+ {
+ return 'XOAUTH2';
+ }
+
+ /**
+ * Try to authenticate the user with $email and $token.
+ *
+ * @param Swift_Transport_SmtpAgent $agent
+ * @param string $email
+ * @param string $token
+ *
+ * @return bool
+ */
+ public function authenticate(Swift_Transport_SmtpAgent $agent, $email, $token)
+ {
+ try {
+ $param = $this->constructXOAuth2Params($email, $token);
+ $agent->executeCommand('AUTH XOAUTH2 '.$param."\r\n", array(235));
+
+ return true;
+ } catch (Swift_TransportException $e) {
+ $agent->executeCommand("RSET\r\n", array(250));
+
+ return false;
+ }
+ }
+
+ /**
+ * Construct the auth parameter.
+ *
+ * @see https://developers.google.com/google-apps/gmail/xoauth2_protocol#the_sasl_xoauth2_mechanism
+ */
+ protected function constructXOAuth2Params($email, $token)
+ {
+ return base64_encode("user=$email\1auth=Bearer $token\1\1");
+ }
+}