Using Gmail API to Send Rich Text Emails Easy Guide!

The new HTML Mail app involves Using Gmail API to Send Rich Text Emails, to send rich-text emails to anyone on your behalf. You can sign up via OAuth by using your Google or Gmail account, and then you’ll see an HTML5 form where you can send emails. The new Gmail API only needs permissions to compose and send messages and does not need access to your Gmail messages or folders, in contrast to Apps Script-based solutions that need full access to your Gmail account. Thus, Using Gmail API to Send Rich Text Emails is easy and quick as well as safe.

Although the app can be easily converted to JavaScript, Python, or Java, it currently uses the Google PHP library to connect to the Gmail API. TinyMCE powers the text editor in the HTML Mail application. Here is the code given and you just need to copy and paste it for Using Gmail API to Send Rich Text Emails.

Code for Using Gmail API to Send Rich Text Emails:

<?php

session_start();

require_once 'Google/Client.php';
require_once 'Google/Service/Gmail.php';

// Replace this with your Google Client ID
$client_id     = 'apps.googleusercontent.com';
$client_secret = 'Your Google Client Secret';
$redirect_uri  = 'http://ctrlq.org/'; // Change this

$client = new Google_Client();
$client->setClientId($client_id);
$client->setClientSecret($client_secret);
$client->setRedirectUri($redirect_uri);

// We only need permissions to compose and send emails
$client->addScope("https://www.googleapis.com/auth/gmail.compose");
$service = new Google_Service_Gmail($client);

// Redirect the URL after OAuth
if (isset($_GET['code'])) {
  $client->authenticate($_GET['code']);
  $_SESSION['access_token'] = $client->getAccessToken();
  $redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
  header('Location: ' . filter_var($redirect, FILTER_SANITIZE_URL));
}

// If Access Toket is not set, show the OAuth URL
if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
  $client->setAccessToken($_SESSION['access_token']);
} else {
  $authUrl = $client->createAuthUrl();
}

if ($client->getAccessToken() && isset($_POST['message'])) {

  $_SESSION['access_token'] = $client->getAccessToken();

  // Prepare the message in message/rfc822
  try {

      // The message needs to be encoded in Base64URL
      $mime = rtrim(strtr(base64_encode($_POST["message"]), '+/', '-_'), '=');
      $msg = new Google_Service_Gmail_Message();
      $msg->setRaw($mime);
      $service->users_messages->send("me", $msg);

  } catch (Exception $e) {
      print($e->getMessage());
      unset($_SESSION['access_token']);
  }

} ?>

<? if ( isset ( $authUrl ) ) { ?>
<a href="<?= $authUrl; ?>"><img src="google.png" title="Sign-in with Google" /></a>
<? } else { ?>
<form method="POST" action="">
  <textarea name="message" required></textarea>
  <input type="email" required name="to">
  <input type="text"  required name="subject">
  <a href="#" onclick="document.forms.htmlmail.submit();return false;">Send Mail</a>
</form>
<? } ?>

Also see Extract Text from PDF files with Google Apps Script Easy Guide!

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