Already having the token, send mail using ms office oauth2 authentication

[nettunodev]

Hi there, is there already a way to authenticate using xoauth2 authentication without the need to get a token?
I already have the token and to get PHPMailer to use it I had to:

• set the AuthType parameter to XOAUTH2;
  $mail->oauth = $oauthToken;

• modify the SMTP.php implementation (line 598) like this:

  // $oauth = $OAuth->getOauth64();

  // Adding new lines, username and token base64 encoding
  $oauth = base64_encode(
                'user=' .
               $username .
                "\001auth=Bearer " .
                $OAuth .
                "\001\001");
  

• modify the PHPMailer.php implementation making the $oauth variable (line 365) public
  public $oauth;

• set the now available oauth parameter, like this
  $mail->oauth = $oauthToken;

This way I was able to authenticate to the MS server and send an email.
Maybe there's already another way to do it but I didn't find it.

[decomplexity]

One problem with driving PHPMailer with an externally-generated access token is that the token expires very quickly. Using a refresh token (which MSFT expires after 90 days for most clients) is far more manageable.

[nettunodev]

One problem with driving PHPMailer with an externally-generated access token is that the token expires very quickly. Using a refresh token (which MSFT expires after 90 days for most clients) is far more manageable.

I already have a function that I call before using the token and that check the validity and eventually refresh it. I don't need PHPMailer to do it for me. Maybe that's also the case for other users...

[greew]

Well... you could of course create your own class, that implements PHPMailer\PHPMailer\OAuthTokenProvider and use that instead of an actual oauth library.

That ought to give you, what you need?

Something like

<?php

class Provider implements \PHPMailer\PHPMailer\OAuthTokenProvider {
    private string $username;
    private string $oauth;

    public function __construct($username, $oauth) {
        $this->username = $username;
        $this->oauth = $oauth;
    }

    public function getOauth64() {
        return base64_encode(
              'user=' .
             $this->username .
              "\001auth=Bearer " .
              $this->oauth .
              "\001\001");
    }
}

And then use that in your mailer

<?php

$provider = new Provider('username', 'token');

$mailer = new PHPMailer();
...
$mailer->setOAuth($provider);
$mailer->send();