{

const THUMB_W = 476;

const THUMB_H = 476;

const PHP_FILE_UPLOAD_ERRORS = [

0 => 'There is no error, the file uploaded with success.',

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.',

];

private static function random_str($len = 10){

$chr = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

$chr_len = strlen($chr);

$random_str = '';

for($i = 0; $i < $len; $i ){

$random_str .= $chr[rand(0, $chr_len - 1)];

}

return $random_str;

}

private static function fix_orientation($path, $img){

if(!function_exists('exif_read_data')){

return $img;

}

$exif = exif_read_data($path);

if(!$exif || !isset($exif['Orientation'])){

return $img;

}

$deg = 0;

switch($exif['Orientation']){

case 3:

$deg = 180;

break;

case 6:

$deg = 270;

break;

case 8:

$deg = 90;

break;

}

if($deg){

return imagerotate($img, $deg, 0);

}

return $img;

}

private static function thumb($source_path, $thumb_path){

ini_set('memory_limit', '128M');

$source_details = getimagesize($source_path);

$source_w = $source_details[0];

$source_h = $source_details[1];

if($source_w > $source_h){

$new_w = self::THUMB_W;

$new_h = intval($source_h * $new_w / $source_w);

} else {

$new_h = self::THUMB_H;

$new_w = intval($source_w * $new_h / $source_h);

}

switch($source_details[2]){

case IMAGETYPE_GIF:

$imgt = "imagegif";

$imgcreatefrom = "imagecreatefromgif";

break;

case IMAGETYPE_JPEG:

$imgt = "imagejpeg";

$imgcreatefrom = "imagecreatefromjpeg";

break;

case IMAGETYPE_PNG:

$imgt = "imagepng";

$imgcreatefrom = "imagecreatefrompng";

break;

case IMAGETYPE_WEBP:

$imgt = "imagewebp";

$imgcreatefrom = "imagecreatefromwebp";

break;

case IMAGETYPE_WBMP:

$imgt = "imagewbmp";

$imgcreatefrom = "imagecreatefromwbmp";

break;

case IMAGETYPE_BMP:

$imgt = "imagebmp";

$imgcreatefrom = "imagecreatefrombmp";

break;

default:

return false;

}

$old_image = $imgcreatefrom($source_path);

if ($old_image === false) return false;

$new_image = imagecreatetruecolor($new_w, $new_h);

imagecopyresampled($new_image, $old_image, 0, 0, 0, 0, $new_w, $new_h, $source_w, $source_h);

$new_image = self::fix_orientation($source_path, $new_image);

$old_image = self::fix_orientation($source_path, $old_image);

return $imgt($new_image, $thumb_path)

&& $imgt($old_image, $source_path);

}

public static function upload(){

if(!$_FILES){

throw new Exception("No file.");

}

// Create MD5

$md5 = md5_file($_FILES['file']['tmp_name']);

// Find duplicate

if($d = DB::get_instance()->query("SELECT `path`, `thumb` FROM `images` WHERE `md5` = ? AND `status` = 1 LIMIT 1", $md5)->first()){

return $d;

}

// Ensure, that directories exists

$_images_path = Config::get('images_path');

$_thumbnails_path = Config::get('thumbnails_path');

if(

(!is_dir($_images_path) && !mkdir($_images_path, 0755, true)) ||

(!is_dir($_thumbnails_path) && !mkdir($_thumbnails_path, 0755, true))

){

throw new Exception("Images or thumbnails directory could not be created.");

}

// Get metadata

$name = $_FILES['file']['name'];

$ext = pathinfo($name, PATHINFO_EXTENSION);

// Save to DB

$id = DB::get_instance()->insert('images', [

'name' => $name,

'type' => $ext,

'md5' => $md5,

'datetime' => 'NOW()',

'status' => 0,

])->last_id();

// Create path name

$name = dechex($id).self::random_str(3).".".$ext;

$path = $_images_path.$name;

$thumb = $_thumbnails_path.$name;

// Save path

if(!move_uploaded_file($_FILES['file']['tmp_name'], $path)){

throw new Exception(self::PHP_FILE_UPLOAD_ERRORS[$_FILES['file']['error']]);

}

// Create thumb

if(!self::thumb($path, $thumb)){

unlink($path);

unlink($thumb);

throw new Exception("File is not valid image.");

}

// Save to DB

DB::get_instance()->update('images', [

'path' => $path,

'thumb' => $thumb,

'status' => 1,

], "WHERE `id` = ?", $id);

return [

"path" => $path,

"thumb" => $thumb

];

}

}