1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Georg Ehrke <oc.list@georgehrke.com>
* @author Jan-Christoph Borchardt <hey@jancborchardt.net>
* @author Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Nmz <nemesiz@nmz.lt>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
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;
}
}
|
