Gmail API: 400 bad request when trying to send an email (PHP code)

Question

I expected the code below to send an email, but I\'m only getting this:

An error occurred: Error calling POST https://www.googleapis.com/gmail/v1/us

Answer 1

This is a full working example, just make sure to change all the appropriate info and use PHPMailer to format a valid mail.

sub = FROM;

$client = new Google_Client();

$client->setAssertionCredentials($credentials);
if ($client->getAuth()->isAccessTokenExpired()) {
    $client->getAuth()->refreshTokenWithAssertion();
}

function create_message() {
    $mail = new PHPMailer();
    $mail->setFrom(FROM, 'John Doe 1');
    $mail->addAddress(TO, 'John Doe 2');
    $mail->Subject = 'Saying Hello';
    $mail->Body = 'This is a message just to say hello. So, "Hello"';
    $mail->preSend();
    $mime = $mail->getSentMIMEMessage();
    return urlsafe_b64encode($mime);
}

function sendMessage($service, $userId, $message) {
    try {
        $message = $service->users_messages->send($userId, $message);
        print 'Message with ID: ' . $message->getId() . ' sent.';
        return $message;
    }
    catch(Exception $e) {
        print 'An error occurred: ' . $e->getMessage();
    }
}

function urlsafe_b64encode($string) {
    $data = base64_encode($string);
    $data = str_replace(array('+','/','=') , array('-','_','') , $data);
    return $data;
}

$service = new \Google_Service_Gmail($client);

$msg = new \Google_Service_Gmail_Message();
$msg->setRaw(create_message());

sendMessage($service, 'me', $msg);
?>