old

sharex.php

<?php
define('SHAREX_KEY', '>:(');
define('SHAREX_URL', 'https://mikoto.misaka.nl/i/%s');
define('SHAREX_DIR', __DIR__ . '/i/');

function die_better($text, $code = 418) {
    http_response_code($code);
    die($text);
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST')
    die_better('Invalid request method.', 405);

if (empty($_REQUEST['SHAREX_KEY']) || !hash_equals(SHAREX_KEY, $_REQUEST['SHAREX_KEY']))
    die_better('Invalid key.', 401);

if (!isset($_FILES['SHAREX_FILE']))
    die_better('No file supplied.', 400);

switch ($_FILES['SHAREX_FILE']['error']) {
    case UPLOAD_ERR_INI_SIZE:
        die_better('Filesize was too large (INI).', 400);
    case UPLOAD_ERR_FORM_SIZE:
        die_better('Filesize was too large (FORM).', 400);
    case UPLOAD_ERR_PARTIAL:
        die_better('Only partially uploaded.', 400);
    case UPLOAD_ERR_NO_FILE:
        die_better('No file supplied?', 400);
    case UPLOAD_ERR_NO_TMP_DIR:
        die_better('No temp folder.', 500);
    case UPLOAD_ERR_CANT_WRITE:
        die_better('Unable to save temporary file.', 500);
    case UPLOAD_ERR_EXTENSION:
        die_better('(((failed)))', 418);
}

$pathinfo = pathinfo($_FILES['SHAREX_FILE']['name']);
$file_ext = strtolower($pathinfo['extension']) === 'php' ? 'txt' : strtolower($pathinfo['extension']);
$filename = $pathinfo['filename'] . '.' . $file_ext;

if (file_exists(SHAREX_DIR . $filename))
    $filename = $pathinfo['filename'] . '-' . str_replace('.', '', microtime(true)) . '.' . $file_ext;

if (!move_uploaded_file($_FILES['SHAREX_FILE']['tmp_name'], SHAREX_DIR . $filename))
    die_better('Upload failed.', 500);

printf(SHAREX_URL, rawurlencode($filename));