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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/../config.php';
function is_swf_file($filename)
{
if (!is_readable($filename)) {
return false;
}
$fh = fopen($filename, 'rb');
if (!$fh)
return false;
$header = fread($fh, 8);
fclose($fh);
if (strlen($header) < 8) {
return false;
}
$signature = substr($header, 0, 3);
$version = ord($header[3]);
if (in_array($signature, ['FWS', 'CWS', 'ZWS'])) {
if ($version >= 6 && $version <= 50) {
return true;
}
}
return false;
}
function parse_swf_file(string $file_path): array
{
$fh = fopen($file_path, 'rb');
if (!$fh) {
throw new RuntimeException('Failed to open the file!');
}
$chunk = fread($fh, 512 * 1024);
fclose($fh);
if (strlen($chunk) < 9) {
throw new RuntimeException('File too short.');
}
$signature = substr($chunk, 0, 3);
if (!in_array($signature, ['FWS', 'CWS', 'ZWS'])) {
throw new RuntimeException('Not a valid SWF.');
}
if ($signature === 'CWS') {
$decompressed = gzuncompress(substr($chunk, 8));
if ($decompressed === false) {
throw new RuntimeException('Bad compressed SWF.');
}
$data = $decompressed;
} else if ($signature === 'ZWS') {
throw new RuntimeException('LZMA SWF is not supported');
} else {
$data = substr($chunk, 8);
}
$bits = ord($data[0]) >> 3;
$bitstr = '';
for ($i = 0; $i < ceil((5 + 4 * $bits) / 8); $i++) {
$bitstr .= str_pad(decbin(ord($data[$i])), 8, '0', STR_PAD_LEFT);
}
$nbits = bindec(substr($bitstr, 0, 5));
$pos = 5;
$xmin = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$xmax = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$ymin = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$ymax = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$width = ($xmax - $xmin) / 20;
$height = ($ymax - $ymin) / 20;
return [$width, $height];
}
function verify_mimetype(string $file_path, string $mimetype): bool
{
$path = escapeshellarg($file_path);
$output = [];
$exitCode = 0;
if (str_starts_with($mimetype, 'image/')) {
$output = shell_exec("identify -quiet -ping $path");
return !empty($output);
} else if (str_starts_with($mimetype, 'video/') || str_starts_with($mimetype, 'audio/')) {
$cmd = "ffprobe -v error -i $path 2>&1";
exec($cmd, $output, $exitCode);
return $exitCode === 0;
} else if ($mimetype == 'application/x-shockwave-flash') {
return is_swf_file($file_path);
}
throw new RuntimeException("Illegal type for MIME verifications: $mimetype");
}
function delete_file(string $file_id, string $file_extension, PDO|null $db = null): bool
{
$paths = [
FILE_UPLOAD_DIRECTORY . "/{$file_id}.{$file_extension}",
FILE_THUMBNAIL_DIRECTORY . "/{$file_id}.webp"
];
foreach ($paths as $path) {
if (is_file($path) && !unlink($path)) {
return false;
}
}
if ($db) {
$db->prepare('DELETE FROM files WHERE id = ? AND extension = ?')->execute([$file_id, $file_extension]);
}
return true;
}
function strip_exif(string $file_path)
{
$file_path = escapeshellarg($file_path);
$output = shell_exec("exiftool -q -EXIF= $file_path $file_path");
return empty($output);
}
function remove_video_letterbox(string $input_path, string $output_path)
{
$input_path = escapeshellarg($input_path);
$output_path = escapeshellarg($output_path);
$output = shell_exec("ffmpeg -nostdin -i $input_path -vf cropdetect=24:16:0 -f null - 2>&1");
if (preg_match_all('/crop=\d+:\d+:\d+:\d+/', $output, $matches)) {
$area = end($matches);
$area = end($area);
} else {
throw new RuntimeException('Could not detect crop parameters. Try upload the video without "Remove letterbox" option.');
}
$area = escapeshellarg($area);
$output = [];
exec("ffmpeg -nostdin -i $input_path -vf $area -c:a copy $output_path 2>&1", $output, $code);
return $code == 0;
}
|
