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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 HTMLPurifier_URI; |
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use HTMLPurifier_URIFilter; |
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use HTMLPurifier_URIParser; |
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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 TransformImageSrc extends HTMLPurifier_AttrTransform { |
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/** |
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* @type HTMLPurifier_URIParser |
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*/ |
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private $parser; |
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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->parser = new HTMLPurifier_URIParser(); |
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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, $context) { |
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if ($context->get('CurrentToken')->name !== 'img' || |
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!isset($attr['src'])) { |
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return $attr; |
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} |
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// Block tracking pixels |
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if (isset($attr['width']) && isset($attr['height']) && |
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(int)$attr['width'] < 5 && (int)$attr['height'] < 5){ |
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// Replace with a transparent png in case it's important for the layout |
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$attr['src'] = $this->urlGenerator->imagePath('mail', 'blocked-image.png'); |
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$attr = $this->setDisplayNone($attr); |
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return $attr; |
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} |
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// Do not block images attached to the email |
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$url = $this->parser->parse($attr['src']); |
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if ($url->host === Util::getServerHostName() && $url->path === $this->urlGenerator->linkToRoute('mail.proxy.proxy')) { |
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$attr['data-original-src'] = $attr['src']; |
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$attr['src'] = $this->urlGenerator->imagePath('mail', 'blocked-image.png'); |
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$attr = $this->setDisplayNone($attr); |
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} |
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return $attr; |
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} |
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/** |
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* @param array $attr |
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* @return array |
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* |
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* Sets html attribute style="display: none;", keeps old style |
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* attributes |
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*/ |
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private function setDisplayNone($attr) { |
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if (isset($attr['style'])) { |
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$attr['style'] = 'display: none;'.$attr['style']; // the space is important for jquery! |
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} else { |
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$attr['style'] = 'display: none;'; |
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} |
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return $attr; |
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} |
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} |
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owncloud /
mail
