Extension/EmailTag

Extension

{{Extension |name=EmailTag |purpose=Protects email addresses from spam using

Source Code 2021

<?php

/**
 * Copyright (C) 2021 Dr. Jesper Zedlitz
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * @package MediaWiki
 * @subpackage Extensions
 * @author Dr. Jesper Zedlitz <jesper at zedlitz dot de>
 * @copyright © 2022 Dr. Jesper Zedlitz
 */

if (!defined('MEDIAWIKI')) die();

/* email tag */
$wgExtensionFunctions[] = 'wfEmailTag';
$wgExtensionCredits['parserhook'][] = array(
        'name'    => 'EmailTag',
        'author'  => 'Jesper Zedlitz',
        'version' => '0.1',
        'url'     => ''
);

function wfEmailTag() {
  global $wgParser;
  $wgParser->setHook( "email", "wfEmailTagDoit" );
}

function wfEmailTagDoit($text="") {
  $size=4;

  $fontwidth = imagefontwidth($size);
  $fontheight = imagefontheight($size);
  $width = strlen($text) * $fontwidth + 4;
  $height = $fontheight + 2;
  $im = @imagecreatetruecolor ($width, $height) or exit;
  $trans = imagecolorallocate ($im, 255,255,255); /* must be black! */
  $color = imagecolorallocate ($im, 1,1,1); /* nearly black ;) */
  imagefill ( $im, 0, 0, $trans );
  imagestring($im, $size, 2, 0, $text, $color);

  ob_start();
  imagepng($im);
  $image_data = ob_get_contents();
  ob_end_clean();
  imageDestroy($im);

  $png = base64_encode($image_data);

  $text  = "<img src=\"data:image/png;base64,$png\" alt=\"some mail\" />";

  return $text;
}