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<?php |
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/** |
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* This file contains functionality related to parsing Markdown across BZiON |
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* |
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* @package BZiON |
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* @license https://github.com/allejo/bzion/blob/master/LICENSE.md GNU General Public License Version 3 |
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*/ |
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namespace BZIon; |
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/** |
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* This class extends Parsedown and adds functionality to enable or disable functionality |
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*/ |
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class MarkdownEngine extends \Parsedown |
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{ |
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/** |
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* Whether or not to allow images to be rendered. If set to false, it'll be rendered as a hyperlink |
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* @var bool |
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*/ |
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protected $allowImages; |
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/** |
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* Store all of the settings related to Camo |
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* @var array |
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*/ |
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private $camo; |
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/** |
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* Constructor for our extension of Parsedown |
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*/ |
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public function __construct() |
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{ |
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$this->camo = array(); |
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$this->camo['enabled'] = \Service::getParameter('bzion.features.camo.enabled'); |
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if ($this->camo['enabled']) { |
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$this->camo['key'] = \Service::getParameter('bzion.features.camo.key'); |
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$this->camo['base_url'] = \Service::getParameter('bzion.features.camo.base_url'); |
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$this->camo['whitelisted_domains'] = \Service::getParameter('bzion.features.camo.whitelisted_domains'); |
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} |
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} |
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/** |
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* Overload the function to either return nothing (if image image rendering is disable) or return the |
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* rendered image by calling the Parsedown function |
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* |
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* @param string $Excerpt The excerpt of text to be processed as an image |
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* |
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* @return array|null|void |
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*/ |
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protected function inlineImage($Excerpt) |
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{ |
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if ($this->allowImages) { |
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$Image = parent::inlineImage($Excerpt); |
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if ($this->camo['enabled']) { |
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$parts = parse_url($Image['element']['attributes']['src']); |
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if (!isset($parts['host']) || strlen($parts['host']) === 0) { |
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return null; |
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} |
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if (!in_array($parts['host'], $this->camo['whitelisted_domains'])) { |
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$Image['element']['attributes']['src'] = $this->camo['base_url'] . hash_hmac('sha1', $Image['element']['attributes']['src'], $this->camo['key']) . '/' . bin2hex($Image['element']['attributes']['src']); |
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} |
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} |
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return $Image; |
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} |
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return null; |
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} |
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/** |
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* Overload the function replace the scheme + host of the link if belongs to the current website serving the link. |
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* This will prevent CSS rules from treating full URLs as external links. |
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* |
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* @param array $Excerpt The structure of the link to be processed |
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* |
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* @return array |
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*/ |
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protected function inlineLink($Excerpt) |
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{ |
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$link = parent::inlineLink($Excerpt); |
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if (isset($link['element']['attributes']['href'])) { |
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$href = &$link['element']['attributes']['href']; |
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if (strpos($href, $scheme = \Service::getRequest()->getSchemeAndHttpHost()) === 0) { |
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$href = str_replace($scheme, '', $href); |
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} |
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} |
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return $link; |
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} |
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/** |
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* Overload this function to add IDs to the headings (with pound signs) so they can be used as anchors |
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* |
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* @param array $Line |
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* |
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* @return array|null |
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*/ |
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protected function blockHeader($Line) |
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{ |
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$Block = parent::blockHeader($Line); |
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if (isset($Block['element']['text'])) |
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{ |
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$Block['element']['attributes']['id'] = $this->slugifyHeader($Block); |
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} |
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return $Block; |
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} |
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/** |
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* Overload this function to add IDs to headings (with horizontal dashes) so they can be used as anchors |
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* |
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* @param array $Line |
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* @param array|null $Block |
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* |
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* @return array|null |
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*/ |
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protected function blockSetextHeader($Line, array $Block = null) |
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{ |
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$Block = parent::blockSetextHeader($Line, $Block); |
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if (isset($Block['element']['name'])) |
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{ |
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$element = $Block['element']['name']; |
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if ($element == 'h1' || $element == 'h2') |
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{ |
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$Block['element']['attributes']['id'] = $this->slugifyHeader($Block); |
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} |
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} |
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return $Block; |
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} |
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private function slugifyHeader($Block) |
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{ |
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$id = strtolower($Block['element']['text']); |
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$id = str_replace(' ', '-', $id); |
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$id = preg_replace('/[^0-9a-zA-Z-_]/', '', $id); |
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return preg_replace('/-+/', '-', $id); |
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} |
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/** |
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* Disable or enable Parsedown from rendering images |
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* |
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* @param bool $allowImages Whether to allow images to be rendered or not |
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*/ |
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1 |
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public function setAllowImages($allowImages) |
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{ |
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$this->allowImages = $allowImages; |
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1 |
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} |
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} |
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160
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allejo /
bzion
