Token.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\ResourceStorage\Consumer\StreamAccess;
 
class Token
{
    use Hasher;
 
    private bool $locked = false;
    private Encrypt $encrypt;
    private string $uri;
    private string $access_key;
    private ?\ILIAS\ResourceStorage\Consumer\StreamAccess\TokenStream $stream = null;
 
    public function __construct(
        string $uri,
        string $access_key,
        ?\ILIAS\ResourceStorage\Consumer\StreamAccess\TokenStream $stream = null
    ) {
        $this->uri = $uri;
        $this->access_key = $access_key;
        $this->stream = $stream;
        $this->sanityCheck();
    }
 
    private function sanityCheck(): void
    {
        if (!$this->hasInMemoryStream() && !is_file($this->uri)) {
            throw new \InvalidArgumentException('File does not exist');
        }
        // Check relative path
        $relative_uri = $this->unhash($this->access_key);
        if (strpos($this->uri, $relative_uri) === false) {
            throw new \InvalidArgumentException('Access key does not match');
        }
        if ($this->stream !== null && $this->stream->getMetadata()['uri'] !== $this->uri) {
            throw new \InvalidArgumentException('Stream does not match');
        }
        if ($this->stream !== null && strpos((string)$this->stream->getMetadata()['uri'], $relative_uri) === false) {
            throw new \InvalidArgumentException('Stream does not match');
        }
    }
 
    private function unlock(UnlockKey $unlock_key): bool
    {
        return $this->locked = $this->encrypt->check($this, $unlock_key);
    }
 
    private function isLocked(): bool
    {
        return $this->locked;
    }
 
 
    public function hasStreamableStream(): bool
    {
        return $this->stream !== null && !$this->hasInMemoryStream();
    }
 
 
    public function getAccessKey(): string
    {
        return $this->access_key;
    }
 
    public function resolveStream(): TokenStream
    {
        if ($this->locked) {
            throw new \BadMethodCallException('Token is locked und must be unlocked before resolving the stream.');
        }
 
        if ($this->stream === null) {
            $this->stream = new TokenStream(fopen($this->uri, 'rb'));
        }
        $this->sanityCheck();
 
        return $this->stream;
    }
 
    public function hasInMemoryStream(): bool
    {
        return $this->uri === StreamAccess::PHP_MEMORY;
    }
}