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<?php
/**
* Handles POST uploads, generates filenames, moves files around and commits
* uploaded metadata to database.
*/
require_once 'classes/Response.class.php';
require_once 'classes/UploadException.class.php';
require_once 'classes/UploadedFile.class.php';
require_once 'includes/database.inc.php';
/**
* Generates a random name for the file, retrying until we get an unused one.
*
* @param UploadedFile $file
*
* @return string
*/
function generateName($file)
{
global $db;
global $doubledots;
// We start at N retries, and --N until we give up
$tries = POMF_FILES_RETRIES;
$length = POMF_FILES_LENGTH;
$ext = pathinfo($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); // HTTP status code "500 Internal Server Error"
}
$chars = range('a', 'z');
$name = '';
for ($i = 0; $i < $length; ++$i) {
$name .= $chars[array_rand($chars)];
}
// 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(filename) FROM files WHERE filename = (: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 $file
*
* @return array
*/
function uploadFile($file)
{
global $db;
// Handle file errors
if ($file->error) {
throw new UploadException($file->error);
}
// Check if mime type is blocked
if (!in_array(mime_content_type($file), $FILTER_MIME)) {
throw new UploadException(UPLOAD_ERR_EXTENSION);
}
if WHITELIST == true {
if (!in_array(mime_content_type($file), $WHITELIST_MIME)) {
throw new UploadException(UPLOAD_ERR_EXTENSION);
}
// 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, return the proper link
// and data. PHP deletes the temporary file just uploaded automatically.
$q = $db->prepare('SELECT filename, COUNT(*) AS count FROM files WHERE hash = (:hash) '.
'AND size = (:size)');
$q->bindValue(':hash', $file->getSha1(), PDO::PARAM_STR);
$q->bindValue(':size', $file->size, PDO::PARAM_INT);
$q->execute();
$result = $q->fetch();
if ($result['count'] > 0) {
return array(
'hash' => $file->getSha1(),
'name' => $file->name,
'url' => POMF_URL.$result['filename'],
'size' => $file->size,
);
}
// Generate a name for the file
$newname = generateName($file);
// Store the file's full file path in memory
$uploadFile = POMF_FILES_ROOT . $newname;
// Attempt to move it to the static directory
if (!move_uploaded_file($file->tempfile, $uploadFile)) {
throw new Exception('Failed to move file to destination',
500); // HTTP status code "500 Internal Server Error"
}
// Need to change permissions for the new file to make it world readable
if (!chmod($uploadFile, 0644)) {
throw new Exception('Failed to change file permissions',
500); // HTTP status code "500 Internal Server Error"
}
// Add it to the database
// 'expire' support is deprecated since version 2.1.0. It may be
// removed in a future release.
$q = $db->prepare('INSERT INTO files (hash, originalname, filename, size, date, '.
'expire, delid) VALUES (:hash, :orig, :name, :size, :date, '.
':exp, :del)');
// Common parameters binding
$q->bindValue(':hash', $file->getSha1(), 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); // Deprecated since version 2.1.0
$q->bindValue(':del', sha1($file->tempfile), PDO::PARAM_STR);
$q->execute();
return array(
'hash' => $file->getSha1(),
'name' => $file->name,
'url' => POMF_URL.$newname,
'size' => $file->size,
);
}
/**
* Reorder files array by file.
*
* @param $_FILES
*
* @return array
*/
function diverseArray($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();
$files = diverseArray($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 $_FILES nor in UploadedFile;
// it was never implemented and has been deprecated since version 2.1.0.
//$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) {
$res[] = uploadFile($upload);
}
$response->send($res);
} catch (Exception $e) {
$response->error($e->getCode(), $e->getMessage());
}
} else {
$response->error(400, 'No input file(s)');
}
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