Class-Management-Portal/view-document.php at main · VigneshMP21/Class-Management-Portal · GitHub

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<?php
include 'includes/db.php';

if (!isset($_GET['file'])) {
    die('File not found');
}

$fileParam = $_GET['file'];

// Security: Validate file path
$file = realpath($fileParam);
$allowed_dir = realpath(__DIR__);

if ($file === false || strpos($file, $allowed_dir) !== 0 || !file_exists($file)) {
    http_response_code(404);
    die('Access denied or file not found');
}

$ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
$filename = basename($file);

// If caller requested the raw file bytes, serve inline (prevents direct-download behavior)
if (isset($_GET['raw'])) {
    $mimeTypes = [
        'pdf'  => 'application/pdf',
        'doc'  => 'application/msword',
        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
        'odt'  => 'application/vnd.oasis.opendocument.text'
    ];
    $mime = $mimeTypes[$ext] ?? 'application/octet-stream';

    // Serve inline so fetch() returns bytes instead of triggering browser download
    header('Content-Type: ' . $mime);
    header('Content-Disposition: inline; filename="' . $filename . '"');
    header('Content-Length: ' . filesize($file));
    readfile($file);
    exit;
}

// For direct PDF serving (viewer page will directly stream PDFs)
if ($ext === 'pdf') {
    $scheme = (!empty($_SERVER['REQUEST_SCHEME'])) ? $_SERVER['REQUEST_SCHEME'] : (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
    $baseUrl = $scheme . '://' . $_SERVER['HTTP_HOST'] . rtrim(dirname($_SERVER['REQUEST_URI']), '/');
    $viewerFileUrl = $baseUrl . '/view-document.php?file=' . urlencode($fileParam) . '&raw=1';
    $downloadUrl = $baseUrl . '/view-document.php?file=' . urlencode($fileParam) . '&raw=1&download=1';

    $viewerFileUrlEsc = htmlspecialchars($viewerFileUrl, ENT_QUOTES);
    $title = htmlspecialchars($filename, ENT_QUOTES | ENT_SUBSTITUTE);
    ?>
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width,initial-scale=1">
        <title><?php echo $title; ?></title>
        <style>
            /* remove any page header and let the PDF fill the viewport */
            html, body { height: 100%; margin: 0; }
            /* full-bleed PDF */
            embed#pdfEmbed { width: 100%; height: 100vh; border: 0; display: block; }
            /* ensure tab title stays */
        </style>
    </head>
    <body>
        <!-- header removed: only embed shown -->
        <embed id="pdfEmbed" src="<?php echo $viewerFileUrlEsc; ?>" type="application/pdf">

        <script>
        (function(){
            var forcedTitle = <?php echo json_encode($title); ?>;
            document.title = forcedTitle;
            var keep = setInterval(function(){
                if (document.title !== forcedTitle) document.title = forcedTitle;
            }, 200);
            setTimeout(function(){ clearInterval(keep); }, 5000);
            try { history.replaceState(history.state, forcedTitle, window.location.href); } catch(e) {}
        })();
        </script>
    </body>
    </html>
    <?php
    exit;
}

// For Word documents, show HTML viewer
if (in_array($ext, ['doc', 'docx'])) {
    // Build a URL that fetches the raw bytes via this same script (raw=1)
    $scheme = (!empty($_SERVER['REQUEST_SCHEME'])) ? $_SERVER['REQUEST_SCHEME'] : (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
    $baseUrl = $scheme . '://' . $_SERVER['HTTP_HOST'] . rtrim(dirname($_SERVER['REQUEST_URI']), '/');
    $viewerFileUrl = $baseUrl . '/view-document.php?file=' . urlencode($fileParam) . '&raw=1';

    // Safely encode for JS
    $viewerFileUrlJs = json_encode($viewerFileUrl);
    $title = htmlspecialchars($filename, ENT_QUOTES | ENT_SUBSTITUTE);
    ?>
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width,initial-scale=1">
        <title><?php echo $title; ?></title>
        <style>
            /* ... minimal styles (kept short) ... */
            body{font-family:Arial,Helvetica,sans-serif;background:#f5f7fa;margin:0;padding:20px}
            .container{max-width:1000px;margin:0 auto;background:#fff;border-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,.06);overflow:hidden}
            .header{background:#185a9d;color:#fff;padding:12px 16px;display:flex;justify-content:space-between;align-items:center}
            .content{padding:24px;min-height:320px}
            .error{background:#fff0f0;color:#c33;padding:12px;border-radius:4px}
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <div><?php echo $title; ?></div>
                <div><button onclick="window.close()">Close</button></div>
            </div>
            <div class="content" id="content">
                <div>Loading document…</div>
            </div>
        </div>

        <script>
        (function() {
            const fileUrl = <?php echo $viewerFileUrlJs; ?>;

            function showError(msg) {
                document.getElementById('content').innerHTML =
                    '<div class="error"><strong>Error loading document:</strong> ' + msg +
                    '<br><br>Please try downloading the file instead.</div>';
            }

            function loadDocument() {
                fetch(fileUrl).then(resp => {
                    if (!resp.ok) throw new Error('Failed to fetch document (' + resp.status + ')');
                    return resp.arrayBuffer();
                }).then(arrayBuffer => {
                    // mammoth should be defined by the CDN script loaded below
                    if (typeof mammoth === 'undefined') {
                        throw new Error('mammoth library not available');
                    }
                    return mammoth.convertToHtml({ arrayBuffer: arrayBuffer });
                }).then(result => {
                    document.getElementById('content').innerHTML =
                        '<div>' + result.value + '</div>';
                }).catch(err => {
                    showError(err.message);
                });
            }

            // Dynamically load Mammoth and call loadDocument on success, show error on failure
            var s = document.createElement('script');
            s.src = 'assets/js/mammoth.min.js'; // relative to current viewer page
            s.onload = loadDocument;
            s.onerror = function(){ showError('Failed to load local mammoth.js library. Check that assets/js/mammoth.min.js exists and is reachable.'); };
            document.head.appendChild(s);
        })();
        </script>
    </body>
    </html>
    <?php
    exit;
}

// Unsupported file type
http_response_code(400);
die('Unsupported file type: ' . htmlspecialchars($ext));
?>