<?php declare(strict_types=1); namespace openvk\Web\Presenters; final class BlobPresenter extends OpenVKPresenter { private function getDirName($dir): string { if(gettype($dir) === "integer") { $dir = (string) $dir; if(strlen($dir) < 2) #Must have been a number with 1 digit $dir = "0$dir"; } return $dir; } function renderFile(/*string*/ $dir, string $name, string $format) { $dir = $this->getDirName($dir); $base = realpath(OPENVK_ROOT . "/storage/$dir"); $path = realpath(OPENVK_ROOT . "/storage/$dir/$name.$format"); if(!$path) # Will also check if file exists since realpath fails on ENOENT $this->notFound(); else if(strpos($path, $path) !== 0) # Prevent directory traversal and storage container escape $this->notFound(); if(isset($_SERVER["HTTP_IF_NONE_MATCH"])) exit(header("HTTP/1.1 304 Not Modified")); header("Content-Type: " . mime_content_type($path)); header("Content-Size: " . filesize($path)); header("Cache-Control: public, max-age=1210000"); header("X-Accel-Expires: 1210000"); header("ETag: W/\"" . hash_file("snefru", $path) . "\""); readfile($path); exit; } }