php

<?php
// Created by sakulmore
// https://sakulmore.eu/

// --- Nastavenia adresára ---
$dirNameUrl    = 'txt_files';                 // URL časť (v prehliadači bude /txt_files/...)
$dirFilesystem = __DIR__ . '/txt_files';      // ABSOLÚTNA cesta na disku k priečinku
$filenameLen   = 9;
$maxTries      = 10;

// --- Limit veľkosti súboru ---
$maxSizeMB     = 10;                           // limit v MB
$maxSizeBytes  = $maxSizeMB * 1024 * 1024;

// --- Expirácia ---
$retentionDays = 3;                            // po koľkých dňoch sa má súbor zmazať
$retentionSec  = $retentionDays * 24 * 60 * 60;

$pasteMessage = '';

// URL prefix (bez zapečenej domény)
function baseUrlToDir(string $dirNameUrl): string
{
    $scheme = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
    $host   = $_SERVER['HTTP_HOST'] ?? 'localhost';
    $base   = rtrim(dirname($_SERVER['SCRIPT_NAME']), '/\\');
    return $scheme . '://' . $host . ($base ? $base : '') . '/' . trim($dirNameUrl, '/') . '/';
}

function randName(int $len): string
{
    $alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $out = '';
    for ($i = 0; $i < $len; $i++) {
        $out .= $alphabet[random_int(0, strlen($alphabet) - 1)];
    }
    return $out;
}

function purgeExpiredTxt(string $dirFilesystem, int $olderThanSec): void
{
    if (!is_dir($dirFilesystem)) return;
    $now = time();
    foreach (glob($dirFilesystem . '/*.txt') ?: [] as $path) {
        if (!is_file($path)) continue;
        $age = $now - @filemtime($path);
        if ($age >= $olderThanSec) {
            @unlink($path);
        }
    }
}

purgeExpiredTxt($dirFilesystem, $retentionSec);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $content = $_POST['content'] ?? '';
    $content = str_replace(["\r\n", "\r"], "\n", $content);

    $detected = mb_detect_encoding($content, ['UTF-8', 'Windows-1250', 'ISO-8859-2', 'Windows-1252', 'ISO-8859-1'], true);
    if ($detected === false) {
        $detected = 'UTF-8';
    }
    $content = iconv($detected, 'UTF-8//IGNORE', $content);

    // Voliteľný BOM pre starší Windows Notepad
    if (!isset($ADD_UTF8_BOM)) {
        $ADD_UTF8_BOM = true;
    } // fallback ak nie je definované
    if ($ADD_UTF8_BOM && !str_starts_with($content, "\xEF\xBB\xBF")) {
        $content = "\xEF\xBB\xBF" . $content;
    }

    if (trim($content) === '') {
        $pasteMessage = 'Area can\'t be empty!';
    } else {
        // 1) Skontroluj / vytvor priečinok (ABS FS cesta)
        if (!is_dir($dirFilesystem)) {
            if (!@mkdir($dirFilesystem, 0755, true) && !is_dir($dirFilesystem)) {
                $pasteMessage = 'Failed to create the txt\_files directory.';
            }
        }

        // 2) Skontroluj zapisovateľnosť
        if ($pasteMessage === '' && !is_writable($dirFilesystem)) {
            $pasteMessage = 'The directory is not writable. Check CHMOD/owner.';
        }

        if ($pasteMessage === '') {
            // 3) Najdi voľný názov
            $filePath = null;
            $fileName = null;
            for ($i = 0; $i < $maxTries; $i++) {
                $fileName  = randName($filenameLen) . '.txt';
                $candidate = $dirFilesystem . '/' . $fileName;
                if (!file_exists($candidate)) {
                    $filePath = $candidate;
                    break;
                }
            }

            if ($filePath === null) {
                $pasteMessage = 'Failed to generate a free filename. Please try again.';
            } else {
                // 4) Zápis obsahu
                $bytes = @file_put_contents($filePath, $content, LOCK_EX);
                if ($bytes === false) {
                    $pasteMessage = 'Writing to the file failed.';
                } else {
                    @touch($filePath, time());

                    // Kontrola veľkosti súboru po zápise
                    $size = @filesize($filePath);
                    if ($size === false) {
                        // nevie zistiť veľkosť – zmaž a vypíš chybu
                        @unlink($filePath);
                        $pasteMessage = 'An error occurred while reading the file size.';
                    } elseif ($size >= $maxSizeBytes) {
                        // prekročený limit
                        @unlink($filePath);
                        $pasteMessage = 'You have exceeded the ' . (int)$maxSizeMB . ' MB limit!';
                    } else {
                        $fileUrl   = htmlspecialchars(baseUrlToDir($dirNameUrl) . $fileName, ENT_QUOTES, 'UTF-8');
                        $expiresAt = date('Y-m-d H:i', time() + $retentionSec);
                        $pasteMessage = 'Done! Your link (expire in: ' . htmlspecialchars($expiresAt, ENT_QUOTES, 'UTF-8') . '):' . '<button type="button" class="form-submit-btn" onclick="navigator.clipboard.writeText(\'' . $fileUrl . '\');">Click to Copy URL</button>';
                    }
                }
            }
        }
    }
}
?>