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|
class UploadHandler
{
protected $options;
// PHP File Upload error message codes:
// http://php.net/manual/en/features.file-upload.errors.php
protected $error_messages = array(
1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
3 => 'The uploaded file was only partially uploaded',
4 => 'No file was uploaded',
6 => 'Missing a temporary folder',
7 => 'Failed to write file to disk',
8 => 'A PHP extension stopped the file upload',
'post_max_size' => 'The uploaded file exceeds the post_max_size directive in php.ini',
'max_file_size' => 'File is too big',
'min_file_size' => 'File is too small',
'accept_file_types' => 'Filetype not allowed',
'max_number_of_files' => 'Maximum number of files exceeded',
'max_width' => 'Image exceeds maximum width',
'min_width' => 'Image requires a minimum width',
'max_height' => 'Image exceeds maximum height',
'min_height' => 'Image requires a minimum height'
);
function __construct($options = null, $initialize = true, $error_messages = null) {
$this->options = array(
'script_url' => $this->get_full_url().'/',
'upload_dir' => dirname($_SERVER['SCRIPT_FILENAME']).'/files/',
'upload_url' => $this->get_full_url().'/files/',
'user_dirs' => false,
'mkdir_mode' => 0755,
'param_name' => 'files',
// Set the following option to 'POST', if your server does not support
// DELETE requests. This is a parameter sent to the client:
'delete_type' => 'DELETE',
'access_control_allow_origin' => '*',
'access_control_allow_credentials' => false,
'access_control_allow_methods' => array(
'OPTIONS',
'HEAD',
'GET',
'POST',
'PUT',
'PATCH',
'DELETE'
),
'access_control_allow_headers' => array(
'Content-Type',
'Content-Range',
'Content-Disposition'
),
// Enable to provide file downloads via GET requests to the PHP script:
'download_via_php' => false,
// Defines which files can be displayed inline when downloaded:
'inline_file_types' => '/\.(gif|jpe?g|png)$/i',
// Defines which files (based on their names) are accepted for upload:
'accept_file_types' => '/.+$/i',
// The php.ini settings upload_max_filesize and post_max_size
// take precedence over the following max_file_size setting:
'max_file_size' => null,
'min_file_size' => 1,
// The maximum number of files for the upload directory:
'max_number_of_files' => null,
// Image resolution restrictions:
'max_width' => null,
'max_height' => null,
'min_width' => 1,
'min_height' => 1,
// Set the following option to false to enable resumable uploads:
'discard_aborted_uploads' => true,
// Set to true to rotate images based on EXIF meta data, if available:
'orient_image' => false,
'image_versions' => array(
// Uncomment the following version to restrict the size of
// uploaded images:
/*
'' => array(
'max_width' => 1920,
'max_height' => 1200,
'jpeg_quality' => 95
),
*/
// Uncomment the following to create medium sized images:
/*
'medium' => array(
'max_width' => 800,
'max_height' => 600,
'jpeg_quality' => 80
),
*/
'thumbnail' => array(
'max_width' => 80,
'max_height' => 80
)
)
);
if ($options) {
$this->options = array_merge($this->options, $options);
}
if ($error_messages) {
$this->error_messages = array_merge($this->error_messages, $error_messages);
}
if ($initialize) {
$this->initialize();
}
}
protected function initialize() {
switch ($_SERVER['REQUEST_METHOD']) {
case 'OPTIONS':
case 'HEAD':
$this->head();
break;
case 'GET':
$this->get();
break;
case 'PATCH':
case 'PUT':
case 'POST':
$this->post();
break;
case 'DELETE':
$this->delete();
break;
default:
$this->header('HTTP/1.1 405 Method Not Allowed');
}
}
protected function get_full_url() {
$https = !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';
return
($https ? 'https://' : 'http://').
(!empty($_SERVER['REMOTE_USER']) ? $_SERVER['REMOTE_USER'].'@' : '').
(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ($_SERVER['SERVER_NAME'].
($https && $_SERVER['SERVER_PORT'] === 443 ||
$_SERVER['SERVER_PORT'] === 80 ? '' : ':'.$_SERVER['SERVER_PORT']))).
substr($_SERVER['SCRIPT_NAME'],0, strrpos($_SERVER['SCRIPT_NAME'], '/'));
}
protected function get_user_id() {
@session_start();
return session_id();
}
protected function get_user_path() {
if ($this->options['user_dirs']) {
return $this->get_user_id().'/';
}
return '';
}
protected function get_upload_path($file_name = null, $version = null) {
$file_name = $file_name ? $file_name : '';
$version_path = empty($version) ? '' : $version.'/';
return $this->options['upload_dir'].$this->get_user_path()
.$version_path.$file_name;
}
protected function get_query_separator($url) {
return strpos($url, '?') === false ? '?' : '&';
}
protected function get_download_url($file_name, $version = null) {
if ($this->options['download_via_php']) {
$url = $this->options['script_url']
.$this->get_query_separator($this->options['script_url'])
.'file='.rawurlencode($file_name);
if ($version) {
$url .= '&version='.rawurlencode($version);
}
return $url.'&download=1';
}
$version_path = empty($version) ? '' : rawurlencode($version).'/';
return $this->options['upload_url'].$this->get_user_path()
.$version_path.rawurlencode($file_name);
}
protected function set_file_delete_properties($file) {
$file->delete_url = $this->options['script_url']
.$this->get_query_separator($this->options['script_url'])
.'file='.rawurlencode($file->name);
$file->delete_type = $this->options['delete_type'];
if ($file->delete_type !== 'DELETE') {
$file->delete_url .= '&_method=DELETE';
}
if ($this->options['access_control_allow_credentials']) {
$file->delete_with_credentials = true;
}
}
// Fix for overflowing signed 32 bit integers,
// works for sizes up to 2^32-1 bytes (4 GiB - 1):
protected function fix_integer_overflow($size) {
if ($size < 0) {
$size += 2.0 * (PHP_INT_MAX + 1);
}
return $size;
}
protected function get_file_size($file_path, $clear_stat_cache = false) {
if ($clear_stat_cache) {
clearstatcache(true, $file_path);
}
return $this->fix_integer_overflow(filesize($file_path));
}
protected function is_valid_file_object($file_name) {
$file_path = $this->get_upload_path($file_name);
if (is_file($file_path) && $file_name[0] !== '.') {
return true;
}
return false;
}
protected function get_file_object($file_name) {
if ($this->is_valid_file_object($file_name)) {
$file = new stdClass();
$file->name = $file_name;
$file->size = $this->get_file_size(
$this->get_upload_path($file_name)
);
$file->url = $this->get_download_url($file->name);
foreach($this->options['image_versions'] as $version => $options) {
if (!empty($version)) {
if (is_file($this->get_upload_path($file_name, $version))) {
$file->{$version.'_url'} = $this->get_download_url(
$file->name,
$version
);
}
}
}
$this->set_file_delete_properties($file);
return $file;
}
return null;
}
protected function get_file_objects($iteration_method = 'get_file_object') {
$upload_dir = $this->get_upload_path();
if (!is_dir($upload_dir)) {
return array();
}
return array_values(array_filter(array_map(
array($this, $iteration_method),
scandir($upload_dir)
)));
}
protected function count_file_objects() {
return count($this->get_file_objects('is_valid_file_object'));
}
protected function create_scaled_image($file_name, $version, $options) {
$file_path = $this->get_upload_path($file_name);
if (!empty($version)) {
$version_dir = $this->get_upload_path(null, $version);
if (!is_dir($version_dir)) {
mkdir($version_dir, $this->options['mkdir_mode'], true);
}
$new_file_path = $version_dir.'/'.$file_name;
} else {
$new_file_path = $file_path;
}
list($img_width, $img_height) = @getimagesize($file_path);
if (!$img_width || !$img_height) {
return false;
}
$scale = min(
$options['max_width'] / $img_width,
$options['max_height'] / $img_height
);
if ($scale >= 1) {
if ($file_path !== $new_file_path) {
return copy($file_path, $new_file_path);
}
return true;
}
$new_width = $img_width * $scale;
$new_height = $img_height * $scale;
$new_img = @imagecreatetruecolor($new_width, $new_height);
switch (strtolower(substr(strrchr($file_name, '.'), 1))) {
case 'jpg':
case 'jpeg':
$src_img = @imagecreatefromjpeg($file_path);
$write_image = 'imagejpeg';
$image_quality = isset($options['jpeg_quality']) ?
$options['jpeg_quality'] : 75;
break;
case 'gif':
@imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
$src_img = @imagecreatefromgif($file_path);
$write_image = 'imagegif';
$image_quality = null;
break;
case 'png':
@imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
@imagealphablending($new_img, false);
@imagesavealpha($new_img, true);
$src_img = @imagecreatefrompng($file_path);
$write_image = 'imagepng';
$image_quality = isset($options['png_quality']) ?
$options['png_quality'] : 9;
break;
default:
$src_img = null;
}
$success = $src_img && @imagecopyresampled(
$new_img,
$src_img,
0, 0, 0, 0,
$new_width,
$new_height,
$img_width,
$img_height
) && $write_image($new_img, $new_file_path, $image_quality);
// Free up memory (imagedestroy does not delete files):
@imagedestroy($src_img);
@imagedestroy($new_img);
return $success;
}
protected function get_error_message($error) {
return array_key_exists($error, $this->error_messages) ?
$this->error_messages[$error] : $error;
}
function get_config_bytes($val) {
$val = trim($val);
$last = strtolower($val[strlen($val)-1]);
switch($last) {
case 'g':
$val *= 1024;
case 'm':
$val *= 1024;
case 'k':
$val *= 1024;
}
return $this->fix_integer_overflow($val);
}
protected function validate($uploaded_file, $file, $error, $index) {
if ($error) {
$file->error = $this->get_error_message($error);
return false;
}
$content_length = $this->fix_integer_overflow(intval($_SERVER['CONTENT_LENGTH']));
$post_max_size = $this->get_config_bytes(ini_get('post_max_size'));
if ($post_max_size && ($content_length > $post_max_size)) {
$file->error = $this->get_error_message('post_max_size');
return false;
}
if (!preg_match($this->options['accept_file_types'], $file->name)) {
$file->error = $this->get_error_message('accept_file_types');
return false;
}
if ($uploaded_file && is_uploaded_file($uploaded_file)) {
$file_size = $this->get_file_size($uploaded_file);
} else {
$file_size = $content_length;
}
if ($this->options['max_file_size'] && (
$file_size > $this->options['max_file_size'] ||
$file->size > $this->options['max_file_size'])
) {
$file->error = $this->get_error_message('max_file_size');
return false;
}
if ($this->options['min_file_size'] &&
$file_size < $this->options['min_file_size']) {
$file->error = $this->get_error_message('min_file_size');
return false;
}
if (is_int($this->options['max_number_of_files']) && (
$this->count_file_objects() >= $this->options['max_number_of_files'])
) {
$file->error = $this->get_error_message('max_number_of_files');
return false;
}
list($img_width, $img_height) = @getimagesize($uploaded_file);
if (is_int($img_width)) {
if ($this->options['max_width'] && $img_width > $this->options['max_width']) {
$file->error = $this->get_error_message('max_width');
return false;
}
if ($this->options['max_height'] && $img_height > $this->options['max_height']) {
$file->error = $this->get_error_message('max_height');
return false;
}
if ($this->options['min_width'] && $img_width < $this->options['min_width']) {
$file->error = $this->get_error_message('min_width');
return false;
}
if ($this->options['min_height'] && $img_height < $this->options['min_height']) {
$file->error = $this->get_error_message('min_height');
return false;
}
}
return true;
}
protected function upcount_name_callback($matches) {
$index = isset($matches[1]) ? intval($matches[1]) + 1 : 1;
$ext = isset($matches[2]) ? $matches[2] : '';
return ' ('.$index.')'.$ext;
}
protected function upcount_name($name) {
return preg_replace_callback(
'/(?:(?: \(([\d]+)\))?(\.[^.]+))?$/',
array($this, 'upcount_name_callback'),
$name,
1
);
}
protected function get_unique_filename($name, $type, $index, $content_range) {
while(is_dir($this->get_upload_path($name))) {
$name = $this->upcount_name($name);
}
// Keep an existing filename if this is part of a chunked upload:
$uploaded_bytes = $this->fix_integer_overflow(intval($content_range[1]));
while(is_file($this->get_upload_path($name))) {
if ($uploaded_bytes === $this->get_file_size(
$this->get_upload_path($name))) {
break;
}
$name = $this->upcount_name($name);
}
return $name;
}
protected function trim_file_name($name, $type, $index, $content_range) {
// Remove path information and dots around the filename, to prevent uploading
// into different directories or replacing hidden system files.
// Also remove control characters and spaces (\x00..\x20) around the filename:
$name = trim(basename(stripslashes($name)), ".\x00..\x20");
// Use a timestamp for empty filenames:
if (!$name) {
$name = str_replace('.', '-', microtime(true));
}
// Add missing file extension for known image types:
if (strpos($name, '.') === false &&
preg_match('/^image\/(gif|jpe?g|png)/', $type, $matches)) {
$name .= '.'.$matches[1];
}
return $name;
}
protected function get_file_name($name, $type, $index, $content_range) {
return $this->get_unique_filename(
$this->trim_file_name($name, $type, $index, $content_range),
$type,
$index,
$content_range
);
}
protected function handle_form_data($file, $index) {
// Handle form data, e.g. $_REQUEST['description'][$index]
}
protected function orient_image($file_path) {
if (!function_exists('exif_read_data')) {
return false;
}
$exif = @exif_read_data($file_path);
if ($exif === false) {
return false;
}
$orientation = intval(@$exif['Orientation']);
if (!in_array($orientation, array(3, 6, 8))) {
return false;
}
$image = @imagecreatefromjpeg($file_path);
switch ($orientation) {
case 3:
$image = @imagerotate($image, 180, 0);
break;
case 6:
$image = @imagerotate($image, 270, 0);
break;
case 8:
$image = @imagerotate($image, 90, 0);
break;
default:
return false;
}
$success = imagejpeg($image, $file_path);
// Free up memory (imagedestroy does not delete files):
@imagedestroy($image);
return $success;
}
protected function handle_file_upload($uploaded_file, $name, $size, $type, $error,
$index = null, $content_range = null) {
$file = new stdClass();
$file->name = $this->get_file_name($name, $type, $index, $content_range);
$file->size = $this->fix_integer_overflow(intval($size));
$file->type = $type;
if ($this->validate($uploaded_file, $file, $error, $index)) {
$this->handle_form_data($file, $index);
$upload_dir = $this->get_upload_path();
if (!is_dir($upload_dir)) {
mkdir($upload_dir, $this->options['mkdir_mode'], true);
}
$file_path = $this->get_upload_path($file->name);
$append_file = $content_range && is_file($file_path) &&
$file->size > $this->get_file_size($file_path);
if ($uploaded_file && is_uploaded_file($uploaded_file)) {
// multipart/formdata uploads (POST method uploads)
if ($append_file) {
file_put_contents(
$file_path,
fopen($uploaded_file, 'r'),
FILE_APPEND
);
} else {
move_uploaded_file($uploaded_file, $file_path);
}
} else {
// Non-multipart uploads (PUT method support)
file_put_contents(
$file_path,
fopen('php://input', 'r'),
$append_file ? FILE_APPEND : 0
);
}
$file_size = $this->get_file_size($file_path, $append_file);
if ($file_size === $file->size) {
if ($this->options['orient_image']) {
$this->orient_image($file_path);
}
$file->url = $this->get_download_url($file->name);
foreach($this->options['image_versions'] as $version => $options) {
if ($this->create_scaled_image($file->name, $version, $options)) {
if (!empty($version)) {
$file->{$version.'_url'} = $this->get_download_url(
$file->name,
$version
);
} else {
$file_size = $this->get_file_size($file_path, true);
}
}
}
} else if (!$content_range && $this->options['discard_aborted_uploads']) {
unlink($file_path);
$file->error = 'abort';
}
$file->size = $file_size;
$this->set_file_delete_properties($file);
}
return $file;
}
protected function readfile($file_path) {
return readfile($file_path);
}
protected function body($str) {
echo $str;
}
protected function header($str) {
header($str);
}
protected function generate_response($content, $print_response = true) {
if ($print_response) {
$json = json_encode($content);
$redirect = isset($_REQUEST['redirect']) ?
stripslashes($_REQUEST['redirect']) : null;
if ($redirect) {
$this->header('Location: '.sprintf($redirect, rawurlencode($json)));
return;
}
$this->head();
if (isset($_SERVER['HTTP_CONTENT_RANGE'])) {
$files = isset($content[$this->options['param_name']]) ?
$content[$this->options['param_name']] : null;
if ($files && is_array($files) && is_object($files[0]) && $files[0]->size) {
$this->header('Range: 0-'.($this->fix_integer_overflow(intval($files[0]->size)) - 1));
}
}
$this->body($json);
}
return $content;
}
protected function get_version_param() {
return isset($_GET['version']) ? basename(stripslashes($_GET['version'])) : null;
}
protected function get_file_name_param() {
return isset($_GET['file']) ? basename(stripslashes($_GET['file'])) : null;
}
protected function get_file_type($file_path) {
switch (strtolower(pathinfo($file_path, PATHINFO_EXTENSION))) {
case 'jpeg':
case 'jpg':
return 'image/jpeg';
case 'png':
return 'image/png';
case 'gif':
return 'image/gif';
default:
return '';
}
}
protected function download() {
if (!$this->options['download_via_php']) {
$this->header('HTTP/1.1 403 Forbidden');
return;
}
$file_name = $this->get_file_name_param();
if ($this->is_valid_file_object($file_name)) {
$file_path = $this->get_upload_path($file_name, $this->get_version_param());
if (is_file($file_path)) {
if (!preg_match($this->options['inline_file_types'], $file_name)) {
$this->header('Content-Description: File Transfer');
$this->header('Content-Type: application/octet-stream');
$this->header('Content-Disposition: attachment; filename="'.$file_name.'"');
$this->header('Content-Transfer-Encoding: binary');
} else {
// Prevent Internet Explorer from MIME-sniffing the content-type:
$this->header('X-Content-Type-Options: nosniff');
$this->header('Content-Type: '.$this->get_file_type($file_path));
$this->header('Content-Disposition: inline; filename="'.$file_name.'"');
}
$this->header('Content-Length: '.$this->get_file_size($file_path));
$this->header('Last-Modified: '.gmdate('D, d M Y H:i:s T', filemtime($file_path)));
$this->readfile($file_path);
}
}
}
protected function send_content_type_header() {
$this->header('Vary: Accept');
if (isset($_SERVER['HTTP_ACCEPT']) &&
(strpos($_SERVER['HTTP_ACCEPT'], 'application/json') !== false)) {
$this->header('Content-type: application/json');
} else {
$this->header('Content-type: text/plain');
}
}
protected function send_access_control_headers() {
$this->header('Access-Control-Allow-Origin: '.$this->options['access_control_allow_origin']);
$this->header('Access-Control-Allow-Credentials: '
.($this->options['access_control_allow_credentials'] ? 'true' : 'false'));
$this->header('Access-Control-Allow-Methods: '
.implode(', ', $this->options['access_control_allow_methods']));
$this->header('Access-Control-Allow-Headers: '
.implode(', ', $this->options['access_control_allow_headers']));
}
public function head() {
$this->header('Pragma: no-cache');
$this->header('Cache-Control: no-store, no-cache, must-revalidate');
$this->header('Content-Disposition: inline; filename="files.json"');
// Prevent Internet Explorer from MIME-sniffing the content-type:
$this->header('X-Content-Type-Options: nosniff');
if ($this->options['access_control_allow_origin']) {
$this->send_access_control_headers();
}
$this->send_content_type_header();
}
public function get($print_response = true) {
if ($print_response && isset($_GET['download'])) {
return $this->download();
}
$file_name = $this->get_file_name_param();
if ($file_name) {
$response = array(
substr($this->options['param_name'], 0, -1) => $this->get_file_object($file_name)
);
} else {
$response = array(
$this->options['param_name'] => $this->get_file_objects()
);
}
return $this->generate_response($response, $print_response);
}
public function post($print_response = true) {
if (isset($_REQUEST['_method']) && $_REQUEST['_method'] === 'DELETE') {
return $this->delete($print_response);
}
$upload = isset($_FILES[$this->options['param_name']]) ?
$_FILES[$this->options['param_name']] : null;
// Parse the Content-Disposition header, if available:
$file_name = isset($_SERVER['HTTP_CONTENT_DISPOSITION']) ?
rawurldecode(preg_replace(
'/(^[^"]+")|("$)/',
'',
$_SERVER['HTTP_CONTENT_DISPOSITION']
)) : null;
// Parse the Content-Range header, which has the following form:
// Content-Range: bytes 0-524287/2000000
$content_range = isset($_SERVER['HTTP_CONTENT_RANGE']) ?
preg_split('/[^0-9]+/', $_SERVER['HTTP_CONTENT_RANGE']) : null;
$size = $content_range ? $content_range[3] : null;
$files = array();
if ($upload && is_array($upload['tmp_name'])) {
// param_name is an array identifier like "files[]",
// $_FILES is a multi-dimensional array:
foreach ($upload['tmp_name'] as $index => $value) {
$files[] = $this->handle_file_upload(
$upload['tmp_name'][$index],
$file_name ? $file_name : $upload['name'][$index],
$size ? $size : $upload['size'][$index],
$upload['type'][$index],
$upload['error'][$index],
$index,
$content_range
);
}
} else {
// param_name is a single object identifier like "file",
// $_FILES is a one-dimensional array:
$files[] = $this->handle_file_upload(
isset($upload['tmp_name']) ? $upload['tmp_name'] : null,
$file_name ? $file_name : (isset($upload['name']) ?
$upload['name'] : null),
$size ? $size : (isset($upload['size']) ?
$upload['size'] : $_SERVER['CONTENT_LENGTH']),
isset($upload['type']) ?
$upload['type'] : $_SERVER['CONTENT_TYPE'],
isset($upload['error']) ? $upload['error'] : null,
null,
$content_range
);
}
return $this->generate_response(
array($this->options['param_name'] => $files),
$print_response
);
}
public function delete($print_response = true) {
$file_name = $this->get_file_name_param();
$file_path = $this->get_upload_path($file_name);
$success = is_file($file_path) && $file_name[0] !== '.' && unlink($file_path);
if ($success) {
foreach($this->options['image_versions'] as $version => $options) {
if (!empty($version)) {
$file = $this->get_upload_path($file_name, $version);
if (is_file($file)) {
unlink($file);
}
}
}
}
return $this->generate_response(array('success' => $success), $print_response);
}
} |
