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<?php |
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/** |
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* @author Jakob Sack <[email protected]> |
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* @author Jakob Sack <[email protected]> |
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* |
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* Mail |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OCA\Mail\Service\HtmlPurify; |
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use HTMLPurifier_AttrTransform; |
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use HTMLPurifier_Config; |
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use HTMLPurifier_Context; |
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use OCP\IURLGenerator; |
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use OCP\Util; |
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/** |
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* Adds copies src to data-src on all img tags. |
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*/ |
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class TransformCSSBackground extends HTMLPurifier_AttrTransform { |
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/** @var IURLGenerator */ |
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private $urlGenerator; |
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public function __construct(IURLGenerator $urlGenerator) { |
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$this->urlGenerator = $urlGenerator; |
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} |
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/** |
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* @param array $attr |
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* @param HTMLPurifier_Config $config |
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* @param HTMLPurifier_Context $context |
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* @return array |
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*/ |
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public function transform($attr, $config, $context) { |
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if (!isset($attr['style']) || |
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strpos($attr['style'], 'background') === false) { |
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return $attr; |
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} |
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// Check if there is a background image given |
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$cssAttributes = explode(';', $attr['style']); |
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$func = function($cssAttribute) { |
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if (preg_match('/\S/', $cssAttribute) === 0) { |
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// empty or whitespace |
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return ''; |
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} |
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list($name, $value) = explode(':', $cssAttribute, 2); |
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if(strpos($name, 'background') !== false && |
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strpos($value, 'url(') !== false) { |
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// Replace image URL |
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$value = preg_replace('/url\("?http.*\)/i', |
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'url(' . $this->urlGenerator->imagePath('mail', 'blocked-image.png') . ')', |
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$value); |
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return $name.':'.$value; |
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} else { |
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return $cssAttribute; |
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} |
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}; |
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// Reassemble style |
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$cssAttributes = array_map($func, $cssAttributes); |
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$newStyle = implode(';', $cssAttributes); |
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// Replace style if required |
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if ($newStyle !== $attr['style']) { |
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$attr['data-original-style'] = $attr['style']; |
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$attr['style'] = $newStyle; |
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} |
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return $attr; |
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} |
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} |
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owncloud /
mail
