class PreloadedFile {

public static $PRELOADED_CLOUDINARY_PATH = "/^([^\/]+)\/([^\/]+)\/v(\d+)\/([^#]+)#([^\/]+)$/";

public $filename, $version, $public_id, $signature, $resource_type, $type;

public function __construct($file_info) {

if (preg_match(\Cloudinary\PreloadedFile::$PRELOADED_CLOUDINARY_PATH, $file_info, $matches)) {

$this->resource_type = $matches[1];

$this->type = $matches[2];

$this->version = $matches[3];

$this->filename = $matches[4];

$this->signature = $matches[5];

$public_id_and_format = $this->split_format($this->filename);

$this->public_id = $public_id_and_format[0];

$this->format = $public_id_and_format[1];

} else {

throw new \InvalidArgumentException("Invalid preloaded file info");

}

}

public function is_valid() {

$public_id = $this->resource_type == "raw" ? $this->filename : $this->public_id;

$expected_signature = \Cloudinary::api_sign_request(array("public_id" => $public_id, "version" => $this->version), \Cloudinary::config_get("api_secret"));

return $this->signature == $expected_signature;

}

protected function split_format($identifier) {

$last_dot = strrpos($identifier, ".");

if ($last_dot === false) {

return array($identifier, NULL);

}

$public_id = substr($identifier, 0, $last_dot);

$format = substr($identifier, $last_dot+1);

return array($public_id, $format);

}

public function identifier() {

return "v" . $this->version . "/" . $this->filename;

}

public function extended_identifier() {

return $this->resource_type . "/" . $this->type . "/" . $this->identifier();

}

public function __toString() {

return $this->resource_type . "/" . $this->type . "/v" . $this->version . "/" . $this->filename . "#" . $this->signature;

}

}