1<?php 2/** 3 * DokuWiki Plugin diagrams (Helper Component) 4 * 5 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html 6 * @author Innovakom + CosmoCode <dokuwiki@cosmocode.de> 7 */ 8class helper_plugin_diagrams extends \dokuwiki\Extension\Plugin 9{ 10 /** 11 * Check if the given file is a diagrams.net diagram 12 * 13 * @param string $file 14 * @return bool 15 */ 16 public function isDiagramFile($file) { 17 $svg = file_get_contents($file, false, null, 0, 500); 18 return $this->isDiagram($svg); 19 } 20 21 /** 22 * Check if the given SVG is a diagrams.net diagram 23 * 24 * This is done by ensuring that the service host is part of the SVG header 25 * 26 * @param string $svg The raw SVG data (first 500 bytes are enough) 27 * @return bool 28 */ 29 public function isDiagram($svg) { 30 $svg = substr($svg, 0, 500); // makes checking a tiny bit faster 31 $svg = preg_replace('/^<!DOCTYPE.*?>/', '', $svg); 32 $svg = ltrim($svg); 33 34 if (empty($svg) || substr($svg, 0, 4) !== '<svg') return false; 35 $confServiceUrl = $this->getConf('service_url'); // like "https://diagrams.xyz.org/?embed=1&..." 36 $serviceHost = parse_url($confServiceUrl, PHP_URL_HOST); // Host-Portion of the Url, e.g. "diagrams.xyz.org" 37 return strpos($svg, 'embed.diagrams.net') || strpos($svg, 'draw.io') || strpos($svg, $serviceHost); 38 } 39} 40