WhitelistFileHeaderPreProcessor.php

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<?php
 
namespace ILIAS\FileUpload\Processor;
 
use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\FileUpload\DTO\Metadata;
use ILIAS\FileUpload\DTO\ProcessingStatus;
use ILIAS\FileUpload\ScalarTypeCheckAware;
use Psr\Http\Message\StreamInterface;
 
final class WhitelistFileHeaderPreProcessor implements PreProcessor
{
    use ScalarTypeCheckAware;
 
    private $fileHeader;
    private $fileHeaderLength;
 
 
    public function __construct($fileHeader)
    {
        $this->stringTypeCheck($fileHeader, 'fileHeader');
 
        $this->fileHeaderLength = strlen($fileHeader);
        $this->fileHeader = $fileHeader;
    }
 
 
    public function process(FileStream $stream, Metadata $metadata)
    {
        $header = $stream->read($this->fileHeaderLength);
        if (strcmp($this->fileHeader, $header) === 0) {
            return new ProcessingStatus(ProcessingStatus::OK, 'File header complies with whitelist.');
        }
 
        return new ProcessingStatus(ProcessingStatus::REJECTED, 'File header don\'t complies with whitelist.');
    }
}