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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Preview;
use OCP\Files\File;
use OCP\Files\FileInfo;
use OCP\IImage;
class TXT extends ProviderV2 {
/**
* {@inheritDoc}
*/
public function getMimeType(): string {
return '/text\/plain/';
}
/**
* {@inheritDoc}
*/
public function isAvailable(FileInfo $file): bool {
return $file->getSize() > 0;
}
/**
* {@inheritDoc}
*/
public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
if (!$this->isAvailable($file)) {
return null;
}
$content = $file->fopen('r');
if ($content === false) {
return null;
}
$content = stream_get_contents($content, 3000);
//don't create previews of empty text files
if (trim($content) === '') {
return null;
}
$lines = preg_split("/\r\n|\n|\r/", $content);
// Define text size of text file preview
$fontSize = $maxX ? (int) ((1 / 32) * $maxX) : 5; //5px
$lineSize = ceil($fontSize * 1.5);
$image = imagecreate($maxX, $maxY);
imagecolorallocate($image, 255, 255, 255);
$textColor = imagecolorallocate($image, 0, 0, 0);
$fontFile = __DIR__;
$fontFile .= '/../../../core';
$fontFile .= '/fonts/NotoSans-Regular.ttf';
$canUseTTF = function_exists('imagettftext');
foreach ($lines as $index => $line) {
$index = $index + 1;
$x = 1;
$y = (int) ($index * $lineSize);
if ($canUseTTF === true) {
imagettftext($image, $fontSize, 0, $x, $y, $textColor, $fontFile, $line);
} else {
$y -= $fontSize;
imagestring($image, 1, $x, $y, $line, $textColor);
}
if (($index * $lineSize) >= $maxY) {
break;
}
}
$imageObject = new \OCP\Image();
$imageObject->setResource($image);
return $imageObject->valid() ? $imageObject : null;
}
}
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