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<?php
/**
* Copyright notice
*
* (c) in2code <info@in2code.de>
*
* All rights reserved
*
* This script is part of the TYPO3 project. The TYPO3 project is
* free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* The GNU General Public License can be found at
* http://www.gnu.org/copyleft/gpl.html.
*
* This script 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.
*
* This copyright notice MUST APPEAR in all copies of the script!
*/
declare(strict_types=1);
namespace SGalinski\SgMail\Service;
/**
* Class PlaintextService
*/
class PlaintextService
{
/**
* Function makePlain() removes html tags and add linebreaks
* Easy generate a plain email bodytext from a html bodytext
*
* @param string $content HTML Mail bodytext
* @return string $content
*/
public function makePlain($content)
{
$content = $this->removeInvisibleElements($content);
$content = $this->removeLinebreaksAndTabs($content);
$content = $this->addLineBreaks($content);
$content = $this->addSpaceToTableCells($content);
$content = $this->extractLinkForPlainTextContent($content);
$content = $this->removeTags($content);
$array = [
'<br >',
'<br>',
'<br/>',
'<br />'
];
return trim(str_replace($array, PHP_EOL, $content));
}
/**
* Remove all invisible elements
*
* @param string $content
* @return string
*/
protected function removeInvisibleElements($content)
{
$content = preg_replace(
[
'/<head[^>]*?>.*?<\/head>/siu',
'/<style[^>]*?>.*?<\/style>/siu',
'/<script[^>]*?>.*?<\/script>/siu',
'/<object[^>]*?>.*?<\/object>/siu',
'/<embed[^>]*?>.*?<\/embed>/siu',
'/<applet[^>]*?>.*?<\/applet>/siu',
'/<noframes[^>]*?>.*?<\/noframes>/siu',
'/<noscript[^>]*?>.*?<\/noscript>/siu',
'/<noembed[^>]*?>.*?<\/noembed>/siu',
],
[
'', '', '', '', '', '', '', '', ''
],
$content
);
return $content;
}
/**
* Remove linebreaks and tabs
*
* @param string $content
* @return string
*/
protected function removeLinebreaksAndTabs($content)
{
$content = trim(str_replace(["\n", "\r", "\t"], '', $content));
return $content;
}
/**
* add linebreaks on some parts (</p> => </p><br />)
*
* @param string $content
* @return array
*/
protected function addLineBreaks($content)
{
$tags2LineBreaks = [
'</p>',
'</tr>',
'<ul>',
'</li>',
'</h1>',
'</h2>',
'</h3>',
'</h4>',
'</h5>',
'</h6>',
'</div>',
'</legend>',
'</fieldset>',
'</dd>',
'</dt>'
];
return str_replace($tags2LineBreaks, '</p><br />', $content);
}
/**
* Add a space character to a table cell
*
* @param string $content
* @return string
*/
protected function addSpaceToTableCells($content)
{
return str_replace(['</td>', '</th>'], '</td> ', $content);
}
/**
* Remove all tags but keep br and address
*
* @param string $content
* @return string
*/
protected function removeTags($content)
{
return strip_tags($content, '<br><address>');
}
/**
* Extract uri from href attributes and decode it
*
* replace links
* <a href="xyz">LINK</a>
* ->
* LINK [xyz]
*
* @param string $content
* @return string
*/
protected function extractLinkForPlainTextContent($content)
{
$pattern = '/<a[^>]+href\s*=\s*["\']([^"\']+)["\'][^>]*>(.*?)<\/a>/misu';
return preg_replace_callback($pattern, function ($matches) {
return $matches[2] . ' [' . htmlspecialchars_decode($matches[1]) . ']';
}, $content);
}
}