Untitled

<?php

/**
 * Downloader for a file which is embedded in an URL
 *
 * Free to use!
 *
 * @author  Fabian Rehhauße
 * @country Germany
 * @date    06-16-2018
 */

if(isset($_POST["submit"])) {
    $href = "#";
    $b64 = base64_encode(file_get_contents($_FILES["fileToUpload"]['tmp_name']));
    $name = base64_encode(basename($_FILES["fileToUpload"]['name']));
    $href = "?filename=$name&content=$b64";

    unlink($_FILES["fileToUpload"]['tmp_name']);

    echo("<!DOCTYPE html>\n");
    echo("<html>");
    echo("<body>");
    echo("<a href=\"$href?>\">Your file link</a>");
    echo("</body>");
    echo("</html>");
}
elseif(isset($_GET['content'])){
    $b64_content = str_replace(" ", "+", $_GET['content']);
    $filename = "File";

    if(isset($_GET['filename'])){
        $filename = str_replace("\"", "_", base64_decode($_GET['filename']));
        $filename = str_replace("\\", "_", $filename);
        $filename = str_replace("/", "_", $filename);
        $filename = str_replace(" ", "_", $filename);
    }

    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.basename($filename).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Content-Length: ' . strlen(base64_decode($b64_content)));
    header('Pragma: public');

    echo(base64_decode($b64_content));
}
else {
    echo("<!DOCTYPE html>\n");
    echo('<html>');
    echo('<body>');
    echo('<form action="?" method="post" enctype="multipart/form-data">');
    echo('Select file to upload:');
    echo('<input type="file" name="fileToUpload" id="fileToUpload">');
    echo('<input type="submit" value="Upload" name="submit">');
    echo('</form>');
    echo('</body>');
    echo('</html>');
}