URLSafeSplitPathTransport.php

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<?php

namespace ILIAS\FileDelivery\Token\Transport;

class URLSafeSplitPathTransport implements Transport
{
    public function __construct(private int $max_length = 128)
    {
    }

    public function prepareForTransport(string $compressed_token): string
    {
        $string = rtrim(str_replace(['+', '/'], ['-', '_'], base64_encode($compressed_token)), '=');
        // split string into chunks of 255 characters and separate them with a slash
        $string = chunk_split($string, $this->max_length, "/");

        return $string;
    }

    public function readFromTransport(string $compressed_token): string
    {
        // combine chunks
        $compressed_token = str_replace("/", "", $compressed_token);

        $string = base64_decode(str_replace(['-', '_'], ['+', '/'], $compressed_token . '=='));

        return $string;
    }

}