mirror of https://github.com/nextcloud/server
112 lines
2.8 KiB
PHP
112 lines
2.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Georg Ehrke <oc.list@georgehrke.com>
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* @author Jan-Christoph Borchardt <hey@jancborchardt.net>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Nmz <nemesiz@nmz.lt>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @license AGPL-3.0
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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 OC\Preview;
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use OCP\Files\File;
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use OCP\Files\FileInfo;
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use OCP\IImage;
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class TXT extends ProviderV2 {
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/**
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* {@inheritDoc}
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*/
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public function getMimeType(): string {
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return '/text\/plain/';
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}
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/**
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* {@inheritDoc}
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*/
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public function isAvailable(FileInfo $file): bool {
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return $file->getSize() > 0;
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}
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/**
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* {@inheritDoc}
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*/
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public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
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if (!$this->isAvailable($file)) {
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return null;
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}
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$content = $file->fopen('r');
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if ($content === false) {
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return null;
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}
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$content = stream_get_contents($content, 3000);
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//don't create previews of empty text files
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if (trim($content) === '') {
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return null;
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}
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$lines = preg_split("/\r\n|\n|\r/", $content);
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// Define text size of text file preview
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$fontSize = $maxX ? (int) ((1 / 32) * $maxX) : 5; //5px
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$lineSize = ceil($fontSize * 1.5);
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$image = imagecreate($maxX, $maxY);
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imagecolorallocate($image, 255, 255, 255);
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$textColor = imagecolorallocate($image, 0, 0, 0);
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$fontFile = __DIR__;
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$fontFile .= '/../../../core';
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$fontFile .= '/fonts/NotoSans-Regular.ttf';
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$canUseTTF = function_exists('imagettftext');
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foreach ($lines as $index => $line) {
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$index = $index + 1;
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$x = 1;
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$y = (int) ($index * $lineSize);
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if ($canUseTTF === true) {
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imagettftext($image, $fontSize, 0, $x, $y, $textColor, $fontFile, $line);
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} else {
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$y -= $fontSize;
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imagestring($image, 1, $x, $y, $line, $textColor);
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}
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if (($index * $lineSize) >= $maxY) {
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break;
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}
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}
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$imageObject = new \OC_Image();
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$imageObject->setResource($image);
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return $imageObject->valid() ? $imageObject : null;
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}
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}
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