uc_pdf_invoice_mail.module

<?php

/**
 * @file
 * Generates PDF of order invoice and sends as attachment in mail.
 */

require_once libraries_get_path('dompdf') . '/autoload.inc.php';

use Dompdf\Dompdf;

/**
 * Implements hook_help().
 */
function uc_pdf_invoice_mail_help($path, $arg) {
  switch ($path) {
    case 'admin/help#uc_pdf_invoice_mail':

      $filepath = dirname(__FILE__) . '/README.md';
      if (file_exists($filepath)) {
        $readme = file_get_contents($filepath);
      }
      else {
        $filepath = dirname(__FILE__) . '/README.txt';
        if (file_exists($filepath)) {
          $readme = file_get_contents($filepath);
        }
      }
      if (!isset($readme)) {
        return NULL;
      }
      if (module_exists('markdown')) {
        $filters = module_invoke('markdown', 'filter_info');
        $info = $filters['filter_markdown'];
        if (function_exists($info['process callback'])) {
          $output = $info['process callback']($readme, NULL);
        }
        else {
          $output = '<pre>' . $readme . '</pre>';
        }
      }
      else {
        $output = '<pre>' . $readme . '</pre>';
      }

      return $output;
  }
}

/**
 * Implements hook_mail_alter().
 */
function uc_pdf_invoice_mail_mail_alter(&$message) {
  if (strpos($message['id'], 'uc_order_action-mail') !== FALSE) {
    if (file_exists(libraries_get_path('dompdf') . '/autoload.inc.php')) {
      $body        = $message['body'];
      $invoiceData = implode("", $body);
      if (!empty($invoiceData)) {
        $dompdf = new Dompdf();
        $dompdf->loadHtml($invoiceData);
        $dompdf->render();

        $filename = drupal_tempnam('temporary://', 'invoice_') . '.pdf';
        $output   = $dompdf->output();
        file_put_contents($filename, $output);

        $file            = new StdClass();
        $file->uid       = 1;
        $file->filename  = $filename;
        $file->uri       = $filename;
        $file->filemime  = file_get_mimetype($filename);
        $file->filesize  = filesize($filename);
        $file->timestamp = REQUEST_TIME;
        $file->status    = FILE_STATUS_PERMANENT;
        $file            = file_save($file);

        $pdf_attachment = array(
          'filecontent' => file_get_contents($file->uri),
          'filemime' => $file->filemime,
          'filename' => 'invoice.pdf',
        );
        $message['params']['attachment'] = $pdf_attachment;
        uc_pdf_invoice_mail_add_attachment($message);
      }
    }
  }
}

/**
 * Update Message ContentType.
 */
function uc_pdf_invoice_mail_add_attachment(array &$message) {
  if (!empty($message['params']['attachment'])) {
    $params = $message['params'];
    $attachment = $params['attachment'];
    $filename = basename($attachment['filename']);
    $filecontent = $attachment['filecontent'];
    $content = chunk_split(base64_encode($filecontent));
    $uid = md5(uniqid(time()));

    $messageHeader = &$message['headers'];
    $originalContentType = $messageHeader['Content-Type'];
    $messageHeader['Content-Type'] = "multipart/mixed; boundary=\"$uid\"";

    $header = "This is a multi-part message in MIME format.\r\n";
    $header .= "--$uid\r\n";
    $header .= "Content-Type: $originalContentType \r\n\r\n";
    $header .= wordwrap(implode('', $message['body'])) . "\r\n\r\n";
    $header .= "--$uid\r\n";
    $header .= "Content-Type: $attachment[filemime];
              name=\"" . $filename . "\"\r\n";
    $header .= "Content-Transfer-Encoding: base64\r\n";
    $header .= "Content-Disposition: attachment;
              filename=\"" . $filename . "\"\r\n\r\n";
    $header .= $content . "\r\n\r\n";
    $header .= "--$uid--";
    $message['body'] = [$header];
  }
}