1<?php 2/** 3 * @copyright Copyright (c) 2016, ownCloud, Inc. 4 * 5 * @author Joas Schilling <coding@schilljs.com> 6 * @author Julius Härtl <jus@bitgrid.net> 7 * @author Morris Jobke <hey@morrisjobke.de> 8 * @author Robin Appelman <robin@icewind.nl> 9 * @author Roeland Jago Douma <roeland@famdouma.nl> 10 * 11 * @license AGPL-3.0 12 * 13 * This code is free software: you can redistribute it and/or modify 14 * it under the terms of the GNU Affero General Public License, version 3, 15 * as published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU Affero General Public License for more details. 21 * 22 * You should have received a copy of the GNU Affero General Public License, version 3, 23 * along with this program. If not, see <http://www.gnu.org/licenses/> 24 * 25 */ 26namespace OC\Preview; 27 28use OCP\Files\File; 29use OCP\IImage; 30 31class MarkDown extends TXT { 32 /** 33 * {@inheritDoc} 34 */ 35 public function getMimeType(): string { 36 return '/text\/(x-)?markdown/'; 37 } 38 39 public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage { 40 $content = $file->fopen('r'); 41 42 if ($content === false) { 43 return null; 44 } 45 46 $content = stream_get_contents($content,3000); 47 48 //don't create previews of empty text files 49 if (trim($content) === '') { 50 return null; 51 } 52 53 // Merge text paragraph lines that might belong together 54 $content = preg_replace('/^(\s*)\*\s/mU', '$1- ', $content); 55 56 $content = preg_replace('/((?!^(\s*-|#)).*)(\w|\\|\.)(\r\n|\n|\r)(\w|\*)/mU', '$1 $3', $content); 57 58 // Remove markdown symbols that we cannot easily represent in rendered text in the preview 59 $content = preg_replace('/\*\*(.*)\*\*/U', '$1', $content); 60 $content = preg_replace('/\*(.*)\*/U', '$1', $content); 61 $content = preg_replace('/\_\_(.*)\_\_/U', '$1', $content); 62 $content = preg_replace('/\_(.*)\_/U', '$1', $content); 63 $content = preg_replace('/\~\~(.*)\~\~/U', '$1', $content); 64 65 $content = preg_replace('/\!?\[((.|\n)*)\]\((.*)\)/mU', '$1 ($3)', $content); 66 $content = preg_replace('/\n\n+/', "\n", $content); 67 68 $content = preg_replace('/[\x{10000}-\x{10FFFF}]/u', '', $content); 69 70 $lines = preg_split("/\r\n|\n|\r/", $content); 71 72 // Define text size of text file preview 73 $fontSize = $maxX ? (int) ((1 / ($maxX >= 512 ? 60 : 40) * $maxX)) : 10; 74 75 $image = imagecreate($maxX, $maxY); 76 imagecolorallocate($image, 255, 255, 255); 77 $textColor = imagecolorallocate($image, 0, 0, 0); 78 79 $fontFile = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf'; 80 $fontFileBold = __DIR__ . '/../../../core/fonts/NotoSans-Bold.ttf'; 81 82 $canUseTTF = function_exists('imagettftext'); 83 84 $textOffset = (int)min($maxX * 0.05, $maxY * 0.05); 85 $nextLineStart = 0; 86 $y = $textOffset; 87 foreach ($lines as $line) { 88 $actualFontSize = $fontSize; 89 if (mb_strpos($line, '# ') === 0) { 90 $actualFontSize *= 2; 91 } 92 if (mb_strpos($line, '## ') === 0) { 93 $actualFontSize *= 1.8; 94 } 95 if (mb_strpos($line, '### ') === 0) { 96 $actualFontSize *= 1.6; 97 } 98 if (mb_strpos($line, '#### ') === 0) { 99 $actualFontSize *= 1.4; 100 } 101 if (mb_strpos($line, '##### ') === 0) { 102 $actualFontSize *= 1.2; 103 } 104 if (mb_strpos($line, '###### ') === 0) { 105 $actualFontSize *= 1.1; 106 } 107 108 // Add spacing before headlines 109 if ($actualFontSize !== $fontSize && $y !== $textOffset) { 110 $y += (int)($actualFontSize * 2); 111 } 112 113 $x = $textOffset; 114 $y += (int)($nextLineStart + $actualFontSize); 115 116 if ($canUseTTF === true) { 117 $wordWrap = (int)((1 / $actualFontSize * 1.3) * $maxX); 118 119 // Get rid of markdown symbols that we still needed for the font size 120 $line = preg_replace('/^#*\s/', '', $line); 121 122 $wrappedText = wordwrap($line, $wordWrap,"\n"); 123 $linesWrapped = count(explode("\n", $wrappedText)); 124 imagettftext($image, $actualFontSize, 0, $x, $y, $textColor, $actualFontSize === $fontSize ? $fontFile : $fontFileBold, $wrappedText); 125 $nextLineStart = (int)($linesWrapped * ceil($actualFontSize * 2)); 126 if ($actualFontSize !== $fontSize && $y !== $textOffset) { 127 $nextLineStart -= $actualFontSize; 128 } 129 } else { 130 $y -= $fontSize; 131 imagestring($image, 1, $x, $y, $line, $textColor); 132 $nextLineStart = $fontSize; 133 } 134 135 if ($y >= $maxY) { 136 break; 137 } 138 } 139 140 $imageObject = new \OC_Image(); 141 $imageObject->setResource($image); 142 143 return $imageObject->valid() ? $imageObject : null; 144 } 145} 146