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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
<?php
// Check if we can compress our output; if we can, we'll do it
if (ini_get('zlib.output_compression') !== 'Off'
&& isset($_SERVER["HTTP_ACCEPT_ENCODING"])
&& strpos($_SERVER["HTTP_ACCEPT_ENCODING"], 'gzip') !== false)
ob_start("ob_gzhandler");
session_start();
include_once 'classes/Response.class.php';
include_once 'classes/UploadException.class.php';
include_once 'classes/UploadedFile.class.php';
include_once 'includes/database.inc.php';
/**
* Generates a random name for the file, retrying until we get an unused one
*
* @param UploadedFile $file
* @return string
*/
function generate_name ($file) {
global $db;
global $doubledots;
// We start at N retries, and --N until we give up
$tries = POMF_FILES_RETRIES;
$ext = pathinfo($file->name, PATHINFO_EXTENSION);
// Check if extension is a double-dot extension and, if true, override $ext
$revname = strrev($file->name);
foreach ($doubledots as $ddot) {
if (stripos($revname, $ddot) === 0) {
$ext = strrev($ddot);
}
}
do {
// Iterate until we reach the maximum number of retries
if ($tries-- == 0) throw new Exception('Gave up trying to find an unused name', 500);
$chars = 'abcdefghijklmnopqrstuvwxyz';
$name = '';
for ($i = 0; $i < 6; $i++) {
$name .= $chars[mt_rand(0, 25)];
// $chars string length is hardcoded, should use a variable to store it?
}
// Add the extension to the file name
if (isset($ext) && $ext !== '')
$name .= '.' . strip_tags($ext);
// Check if a file with the same name does already exist in the database
$q = $db->prepare('SELECT COUNT(name) FROM pomf WHERE name = (:name)');
$q->bindValue(':name', $name, PDO::PARAM_STR);
$q->execute();
$result = $q->fetchColumn();
// If it does, generate a new name
} while($result > 0);
return $name;
}
/**
* Handles the uploading and db entry for a file
*
* @param UploadedFile $file
* @return array
*/
function upload_file ($file) {
global $db;
// Handle file errors
if ($file->error) throw new UploadException($file->error);
// Check if a file with the same hash and size (a file which is the same) does already exist in
// the database; if it does, delete the file just uploaded and return the proper link and data.
$q = $db->prepare('SELECT filename, COUNT(*) AS count FROM files WHERE hash = (:hash) ' .
'AND size = (:size)');
$q->bindValue(':hash', $file->get_sha1(), PDO::PARAM_STR);
$q->bindValue(':size', $file->size, PDO::PARAM_INT);
$q->execute();
$result = $q->fetch();
if ($result['count'] > 0) {
unlink($file->tempfile);
return array(
'hash' => $file->get_sha1(),
'name' => $file->name,
'url' => POMF_URL . $result['filename'],
'size' => $file->size
);
}
// Generate a name for the file
$newname = generate_name($file);
// Attempt to move it to the static directory
if (move_uploaded_file($file->tempfile, POMF_FILES_ROOT . $newname)) {
// Need to change permissions for the new file to make it world readable
if (chmod(POMF_FILES_ROOT . $newname, 0644)) {
// Add it to the database
if (empty($_SESSION['id'])) {
// Query if user is NOT logged in
$q = $db->prepare('INSERT INTO files (hash, originalname, filename, size, date, ' .
'expire, delid) VALUES (:hash, :orig, :name, :size, :date, ' .
':exp, :del)');
} else {
// Query if user is logged in (insert user id together with other data)
$q = $db->prepare('INSERT INTO files (hash, originalname, filename, size, date, ' .
'expire, delid, user) VALUES (:hash, :orig, :name, :size, ' .
':date, :expires, :delid, :user)');
$q->bindValue(':user', $_SESSION['id'], PDO::PARAM_INT);
}
// Common parameters binding
$q->bindValue(':hash', $file->get_sha1(), PDO::PARAM_STR);
$q->bindValue(':orig', strip_tags($file->name), PDO::PARAM_STR);
$q->bindValue(':name', $newname, PDO::PARAM_STR);
$q->bindValue(':size', $file->size, PDO::PARAM_INT);
$q->bindValue(':date', date('Y-m-d'), PDO::PARAM_STR);
$q->bindValue(':exp', null, PDO::PARAM_STR);
$q->bindValue(':del', sha1($file->tempfile), PDO::PARAM_STR);
$q->execute();
return array(
'hash' => $file->get_sha1(),
'name' => $file->name,
'url' => $newname,
'size' => $file->size
);
} else {
throw new Exception('Failed to change file permissions', 500);
}
} else {
throw new Exception('Failed to move file to destination', 500);
}
}
/**
* Reorder files array by file
*
* @param $_FILES
* @return array
*/
function diverse_array ($files) {
$result = array();
foreach ($files as $key1 => $value1)
foreach ($value1 as $key2 => $value2)
$result[$key2][$key1] = $value2;
return $result;
}
/**
* Reorganize the $_FILES array into something saner
*
* @param $_FILES
* @return array
*/
function refiles ($files) {
$result = array();
$files = diverse_array($files);
foreach ($files as $file) {
$f = new UploadedFile();
$f->name = $file['name'];
$f->mime = $file['type'];
$f->size = $file['size'];
$f->tempfile = $file['tmp_name'];
$f->error = $file['error'];
// 'expire' doesn't exist neither in $_FILES nor in UploadedFile;
// commented out for future implementation
//$f->expire = $file['expire'];
$result[] = $f;
}
return $result;
}
$type = isset($_GET['output']) ? $_GET['output'] : 'json';
$response = new Response($type);
if (isset($_FILES['files'])) {
$uploads = refiles($_FILES['files']);
try {
foreach ($uploads as $upload)
$res[] = upload_file($upload);
$response->send($res);
} catch (Exception $e) {
$response->error($e->getCode(), $e->getMessage());
}
} else {
$response->error(400, 'No input file(s)');
}
?>
|
