TokenFactory.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\ResourceStorage\Consumer\StreamAccess;
 
use ILIAS\Filesystem\Stream\FileStream;
 
class TokenFactory
{
    use Hasher;
 
    private string $storage_dir;
 
    public function __construct(string $storage_dir)
    {
        $this->storage_dir = $storage_dir;
    }
 
    public function check(string $access_key): Token
    {
        $uri = $this->unhash($access_key);
        $expanded_uri = $this->expandUri($uri);
        $this->checkURI($expanded_uri);
 
        return new Token($expanded_uri, $access_key);
    }
 
    public function lease(FileStream $stream, bool $with_stream_attached = false): Token
    {
        $uri = $stream->getMetadata()['uri'] ?? '';
        $this->checkURI($uri);
        $reduced_uri = $this->reduceURI($uri);
        $access_key = $this->hash($reduced_uri);
 
        if ($with_stream_attached) {
            $token_stream = new TokenStream($stream->detach());
 
            return new Token($uri, $access_key, $token_stream);
        }
 
        return new Token($uri, $access_key);
    }
 
 
    private function checkURI(string $uri): void
    {
        if (!is_dir($this->storage_dir)) {
            throw new \InvalidArgumentException('Storage directory does not exist');
        }
        if ($this->isMemoryStream($uri)) {
            return;
        }
 
        if (
            strpos($uri, $this->storage_dir) === false
            || !is_readable($uri)
            || !file_exists($uri)
        ) {
            throw new \InvalidArgumentException("Invalid access key or path: $uri");
        }
    }
 
    private function reduceURI(string $uri): string
    {
        if (!$this->isMemoryStream($uri)) {
            return str_replace($this->storage_dir, '', $uri);
        }
        return $uri;
    }
 
    private function expandURI(string $uri): string
    {
        if (!$this->isMemoryStream($uri)) {
            return $this->storage_dir . $uri;
        }
        return $uri;
    }
 
    protected function isMemoryStream(string $path): bool
    {
        return $path === StreamAccess::PHP_MEMORY;
    }
}