Dieser Commit ist enthalten in:
2025-06-09 04:38:35 +02:00
Ursprung 888d27442c
Commit fa9d79089a
12 geänderte Dateien mit 1420 neuen und 19 gelöschten Zeilen

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{% extends "base.html" %}
{% block title %}Backup-Codes{% endblock %}
{% block extra_css %}
<style>
.success-icon {
font-size: 5rem;
animation: bounce 0.5s ease-in-out;
}
@keyframes bounce {
0%, 100% { transform: translateY(0); }
50% { transform: translateY(-20px); }
}
.backup-code {
font-family: 'Courier New', monospace;
font-size: 1.3rem;
font-weight: bold;
letter-spacing: 2px;
padding: 8px 15px;
background-color: #f8f9fa;
border: 2px dashed #dee2e6;
border-radius: 5px;
display: inline-block;
margin: 5px;
}
.backup-codes-container {
background-color: #fff;
border: 2px solid #dee2e6;
border-radius: 10px;
padding: 30px;
margin: 20px 0;
}
.action-buttons .btn {
margin: 5px;
}
@media print {
.no-print {
display: none !important;
}
.backup-codes-container {
border: 1px solid #000;
}
}
</style>
{% endblock %}
{% block content %}
<div class="container py-4">
<div class="row">
<div class="col-md-8 offset-md-2">
<!-- Success Message -->
<div class="text-center mb-4">
<div class="success-icon text-success"></div>
<h1 class="mt-3">2FA erfolgreich aktiviert!</h1>
<p class="lead text-muted">Ihre Zwei-Faktor-Authentifizierung ist jetzt aktiv.</p>
</div>
<!-- Backup Codes Card -->
<div class="card shadow">
<div class="card-header bg-warning text-dark">
<h4 class="mb-0">
<span style="font-size: 1.5rem; vertical-align: middle;">⚠️</span>
Wichtig: Ihre Backup-Codes
</h4>
</div>
<div class="card-body">
<div class="alert alert-info mb-4">
<strong>Was sind Backup-Codes?</strong><br>
Diese Codes ermöglichen Ihnen den Zugang zu Ihrem Account, falls Sie keinen Zugriff auf Ihre Authenticator-App haben.
<strong>Jeder Code kann nur einmal verwendet werden.</strong>
</div>
<!-- Backup Codes Display -->
<div class="backup-codes-container text-center">
<h5 class="mb-4">Ihre 8 Backup-Codes:</h5>
<div class="row justify-content-center">
{% for code in backup_codes %}
<div class="col-md-6 col-lg-4 mb-3">
<div class="backup-code">{{ code }}</div>
</div>
{% endfor %}
</div>
</div>
<!-- Action Buttons -->
<div class="text-center action-buttons no-print">
<button type="button" class="btn btn-primary btn-lg" onclick="downloadCodes()">
💾 Als Datei speichern
</button>
<button type="button" class="btn btn-secondary btn-lg" onclick="printCodes()">
🖨️ Drucken
</button>
<button type="button" class="btn btn-info btn-lg" onclick="copyCodes()">
📋 Alle kopieren
</button>
</div>
<hr class="my-4">
<!-- Security Tips -->
<div class="row">
<div class="col-md-6">
<div class="alert alert-danger">
<h6>❌ Nicht empfohlen:</h6>
<ul class="mb-0 small">
<li>Im selben Passwort-Manager wie Ihr Passwort</li>
<li>Als Foto auf Ihrem Handy</li>
<li>In einer unverschlüsselten Datei</li>
<li>Per E-Mail an sich selbst</li>
</ul>
</div>
</div>
<div class="col-md-6">
<div class="alert alert-success">
<h6>✅ Empfohlen:</h6>
<ul class="mb-0 small">
<li>Ausgedruckt in einem Safe</li>
<li>In einem separaten Passwort-Manager</li>
<li>Verschlüsselt auf einem USB-Stick</li>
<li>An einem sicheren Ort zu Hause</li>
</ul>
</div>
</div>
</div>
<!-- Confirmation -->
<div class="text-center mt-4 no-print">
<div class="form-check mb-3">
<input class="form-check-input" type="checkbox" id="confirmSaved" onchange="checkConfirmation()">
<label class="form-check-label" for="confirmSaved">
Ich habe die Backup-Codes sicher gespeichert
</label>
</div>
<a href="{{ url_for('profile') }}" class="btn btn-lg btn-success" id="continueBtn" style="display: none;">
✅ Weiter zum Profil
</a>
</div>
</div>
</div>
</div>
</div>
</div>
<script>
const backupCodes = {{ backup_codes | tojson }};
function checkConfirmation() {
const checkbox = document.getElementById('confirmSaved');
const continueBtn = document.getElementById('continueBtn');
continueBtn.style.display = checkbox.checked ? 'inline-block' : 'none';
}
function downloadCodes() {
const content = `V2 Admin Panel - Backup Codes
=====================================
Generiert am: ${new Date().toLocaleString('de-DE')}
WICHTIG: Bewahren Sie diese Codes sicher auf!
Jeder Code kann nur einmal verwendet werden.
Ihre 8 Backup-Codes:
--------------------
${backupCodes.map((code, i) => `${i + 1}. ${code}`).join('\n')}
Sicherheitshinweise:
-------------------
✓ Bewahren Sie diese Codes getrennt von Ihrem Passwort auf
✓ Speichern Sie sie an einem sicheren physischen Ort
✓ Teilen Sie diese Codes niemals mit anderen
✓ Jeder Code funktioniert nur einmal
Bei Verlust Ihrer Authenticator-App:
------------------------------------
1. Gehen Sie zur Login-Seite
2. Geben Sie Benutzername und Passwort ein
3. Klicken Sie auf "Backup-Code verwenden"
4. Geben Sie einen dieser Codes ein
Nach Verwendung eines Codes sollten Sie neue Backup-Codes generieren.`;
const blob = new Blob([content], { type: 'text/plain;charset=utf-8' });
const url = window.URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `v2-backup-codes-${new Date().toISOString().split('T')[0]}.txt`;
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
document.body.removeChild(a);
// Visual feedback
const btn = event.target;
const originalText = btn.innerHTML;
btn.innerHTML = '✅ Heruntergeladen!';
btn.classList.remove('btn-primary');
btn.classList.add('btn-success');
setTimeout(() => {
btn.innerHTML = originalText;
btn.classList.remove('btn-success');
btn.classList.add('btn-primary');
}, 2000);
}
function printCodes() {
window.print();
}
function copyCodes() {
const codesText = backupCodes.join('\n');
navigator.clipboard.writeText(codesText).then(function() {
// Visual feedback
const btn = event.target;
const originalText = btn.innerHTML;
btn.innerHTML = '✅ Kopiert!';
btn.classList.remove('btn-info');
btn.classList.add('btn-success');
setTimeout(() => {
btn.innerHTML = originalText;
btn.classList.remove('btn-success');
btn.classList.add('btn-info');
}, 2000);
}).catch(function(err) {
alert('Fehler beim Kopieren. Bitte manuell kopieren.');
});
}
</script>
{% endblock %}

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⏱️ <span id="timer-display">5:00</span>
</div>
<span class="text-white me-3">Angemeldet als: {{ username }}</span>
<a href="/profile" class="btn btn-outline-light btn-sm me-2">👤 Profil</a>
<a href="/logout" class="btn btn-outline-light btn-sm">Abmelden</a>
</div>
</div>

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{% extends "base.html" %}
{% block title %}Benutzerprofil{% endblock %}
{% block extra_css %}
<style>
.profile-card {
transition: all 0.3s ease;
border: none;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.profile-card:hover {
box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}
.profile-icon {
font-size: 3rem;
margin-bottom: 1rem;
opacity: 0.8;
}
.security-badge {
font-size: 2rem;
margin-right: 1rem;
}
.form-control:focus {
border-color: #6c757d;
box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.25);
}
.password-strength {
height: 4px;
margin-top: 5px;
border-radius: 2px;
transition: all 0.3s ease;
}
.strength-very-weak { background-color: #dc3545; width: 20%; }
.strength-weak { background-color: #fd7e14; width: 40%; }
.strength-medium { background-color: #ffc107; width: 60%; }
.strength-strong { background-color: #28a745; width: 80%; }
.strength-very-strong { background-color: #0d6efd; width: 100%; }
</style>
{% endblock %}
{% block content %}
<div class="container py-4">
<div class="d-flex justify-content-between align-items-center mb-4">
<h1>👤 Benutzerprofil</h1>
<a href="{{ url_for('dashboard') }}" class="btn btn-secondary">← Zurück zum Dashboard</a>
</div>
{% with messages = get_flashed_messages(with_categories=true) %}
{% if messages %}
{% for category, message in messages %}
<div class="alert alert-{{ 'danger' if category == 'error' else category }} alert-dismissible fade show" role="alert">
{{ message }}
<button type="button" class="btn-close" data-bs-dismiss="alert"></button>
</div>
{% endfor %}
{% endif %}
{% endwith %}
<!-- User Info Stats -->
<div class="row g-3 mb-4">
<div class="col-md-6">
<div class="card profile-card h-100">
<div class="card-body text-center">
<div class="profile-icon text-primary">👤</div>
<h5 class="card-title">{{ user.username }}</h5>
<p class="text-muted mb-0">{{ user.email or 'Keine E-Mail angegeben' }}</p>
<small class="text-muted">Mitglied seit: {{ user.created_at.strftime('%d.%m.%Y') if user.created_at else 'Unbekannt' }}</small>
</div>
</div>
</div>
<div class="col-md-6">
<div class="card profile-card h-100">
<div class="card-body text-center">
<div class="profile-icon text-info">🔐</div>
<h5 class="card-title">Sicherheitsstatus</h5>
{% if user.totp_enabled %}
<span class="badge bg-success">2FA Aktiv</span>
{% else %}
<span class="badge bg-warning text-dark">2FA Inaktiv</span>
{% endif %}
<p class="text-muted mb-0 mt-2">
<small>Letztes Passwort-Update:<br>{{ user.last_password_change.strftime('%d.%m.%Y') if user.last_password_change else 'Noch nie' }}</small>
</p>
</div>
</div>
</div>
</div>
<!-- Password Change Card -->
<div class="card profile-card mb-4">
<div class="card-body">
<h5 class="card-title d-flex align-items-center">
<span class="security-badge">🔑</span>
Passwort ändern
</h5>
<hr>
<form method="POST" action="{{ url_for('change_password') }}">
<div class="mb-3">
<label for="current_password" class="form-label">Aktuelles Passwort</label>
<input type="password" class="form-control" id="current_password" name="current_password" required>
</div>
<div class="mb-3">
<label for="new_password" class="form-label">Neues Passwort</label>
<input type="password" class="form-control" id="new_password" name="new_password" required minlength="8">
<div class="password-strength" id="password-strength"></div>
<div class="form-text" id="password-help">Mindestens 8 Zeichen</div>
</div>
<div class="mb-3">
<label for="confirm_password" class="form-label">Neues Passwort bestätigen</label>
<input type="password" class="form-control" id="confirm_password" name="confirm_password" required>
<div class="invalid-feedback">Passwörter stimmen nicht überein</div>
</div>
<button type="submit" class="btn btn-primary">🔄 Passwort ändern</button>
</form>
</div>
</div>
<!-- 2FA Card -->
<div class="card profile-card mb-4">
<div class="card-body">
<h5 class="card-title d-flex align-items-center">
<span class="security-badge">🔐</span>
Zwei-Faktor-Authentifizierung (2FA)
</h5>
<hr>
{% if user.totp_enabled %}
<div class="d-flex align-items-center mb-3">
<div class="flex-grow-1">
<h6 class="mb-1">Status: <span class="badge bg-success">Aktiv</span></h6>
<p class="text-muted mb-0">Ihr Account ist durch 2FA geschützt</p>
</div>
<div class="text-success" style="font-size: 3rem;"></div>
</div>
<form method="POST" action="{{ url_for('disable_2fa') }}" onsubmit="return confirm('Sind Sie sicher, dass Sie 2FA deaktivieren möchten? Dies verringert die Sicherheit Ihres Accounts.');">
<div class="mb-3">
<label for="password" class="form-label">Passwort zur Bestätigung</label>
<input type="password" class="form-control" id="password" name="password" required placeholder="Ihr aktuelles Passwort">
</div>
<button type="submit" class="btn btn-danger">🚫 2FA deaktivieren</button>
</form>
{% else %}
<div class="d-flex align-items-center mb-3">
<div class="flex-grow-1">
<h6 class="mb-1">Status: <span class="badge bg-warning text-dark">Inaktiv</span></h6>
<p class="text-muted mb-0">Aktivieren Sie 2FA für zusätzliche Sicherheit</p>
</div>
<div class="text-warning" style="font-size: 3rem;">⚠️</div>
</div>
<p class="text-muted">
Mit 2FA wird bei jeder Anmeldung zusätzlich ein Code aus Ihrer Authenticator-App benötigt.
Dies schützt Ihren Account auch bei kompromittiertem Passwort.
</p>
<a href="{{ url_for('setup_2fa') }}" class="btn btn-success">✨ 2FA einrichten</a>
{% endif %}
</div>
</div>
</div>
<script>
// Password strength indicator
document.getElementById('new_password').addEventListener('input', function(e) {
const password = e.target.value;
let strength = 0;
if (password.length >= 8) strength++;
if (password.match(/[a-z]/) && password.match(/[A-Z]/)) strength++;
if (password.match(/[0-9]/)) strength++;
if (password.match(/[^a-zA-Z0-9]/)) strength++;
const strengthText = ['Sehr schwach', 'Schwach', 'Mittel', 'Stark', 'Sehr stark'];
const strengthClass = ['strength-very-weak', 'strength-weak', 'strength-medium', 'strength-strong', 'strength-very-strong'];
const textClass = ['text-danger', 'text-warning', 'text-warning', 'text-success', 'text-primary'];
const strengthBar = document.getElementById('password-strength');
const helpText = document.getElementById('password-help');
if (password.length > 0) {
strengthBar.className = `password-strength ${strengthClass[strength]}`;
strengthBar.style.display = 'block';
helpText.textContent = `Stärke: ${strengthText[strength]}`;
helpText.className = `form-text ${textClass[strength]}`;
} else {
strengthBar.style.display = 'none';
helpText.textContent = 'Mindestens 8 Zeichen';
helpText.className = 'form-text';
}
});
// Confirm password validation
document.getElementById('confirm_password').addEventListener('input', function(e) {
const password = document.getElementById('new_password').value;
const confirm = e.target.value;
if (confirm.length > 0) {
if (password !== confirm) {
e.target.classList.add('is-invalid');
e.target.setCustomValidity('Passwörter stimmen nicht überein');
} else {
e.target.classList.remove('is-invalid');
e.target.classList.add('is-valid');
e.target.setCustomValidity('');
}
} else {
e.target.classList.remove('is-invalid', 'is-valid');
}
});
// Also check when password field changes
document.getElementById('new_password').addEventListener('input', function(e) {
const confirm = document.getElementById('confirm_password');
if (confirm.value.length > 0) {
confirm.dispatchEvent(new Event('input'));
}
});
</script>
{% endblock %}

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{% extends "base.html" %}
{% block title %}2FA Einrichten{% endblock %}
{% block extra_css %}
<style>
.setup-card {
transition: all 0.3s ease;
border: none;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.setup-card:hover {
box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}
.step-number {
display: inline-flex;
align-items: center;
justify-content: center;
width: 35px;
height: 35px;
background-color: #0d6efd;
color: white;
border-radius: 50%;
font-weight: bold;
margin-right: 10px;
}
.app-icon {
width: 40px;
height: 40px;
object-fit: contain;
margin-right: 10px;
}
.qr-container {
background: white;
padding: 20px;
border-radius: 10px;
display: inline-block;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.secret-code {
font-family: monospace;
font-size: 1.2rem;
letter-spacing: 2px;
background-color: #f8f9fa;
padding: 10px 15px;
border-radius: 5px;
word-break: break-all;
}
.code-input {
font-size: 2rem;
letter-spacing: 0.5rem;
text-align: center;
font-family: monospace;
font-weight: bold;
}
</style>
{% endblock %}
{% block content %}
<div class="container py-4">
<div class="d-flex justify-content-between align-items-center mb-4">
<h1>🔐 2FA einrichten</h1>
<a href="{{ url_for('profile') }}" class="btn btn-secondary">← Zurück zum Profil</a>
</div>
{% with messages = get_flashed_messages(with_categories=true) %}
{% if messages %}
{% for category, message in messages %}
<div class="alert alert-{{ 'danger' if category == 'error' else category }} alert-dismissible fade show" role="alert">
{{ message }}
<button type="button" class="btn-close" data-bs-dismiss="alert"></button>
</div>
{% endfor %}
{% endif %}
{% endwith %}
<!-- Step 1: Install App -->
<div class="card setup-card mb-4">
<div class="card-body">
<h5 class="card-title">
<span class="step-number">1</span>
Authenticator-App installieren
</h5>
<p class="ms-5">Wählen Sie eine der folgenden Apps für Ihr Smartphone:</p>
<div class="row ms-4">
<div class="col-md-4 mb-2">
<div class="d-flex align-items-center">
<span style="font-size: 2rem; margin-right: 10px;">📱</span>
<div>
<strong>Google Authenticator</strong><br>
<small class="text-muted">Android / iOS</small>
</div>
</div>
</div>
<div class="col-md-4 mb-2">
<div class="d-flex align-items-center">
<span style="font-size: 2rem; margin-right: 10px;">🔷</span>
<div>
<strong>Microsoft Authenticator</strong><br>
<small class="text-muted">Android / iOS</small>
</div>
</div>
</div>
<div class="col-md-4 mb-2">
<div class="d-flex align-items-center">
<span style="font-size: 2rem; margin-right: 10px;">🔴</span>
<div>
<strong>Authy</strong><br>
<small class="text-muted">Android / iOS / Desktop</small>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Step 2: Scan QR Code -->
<div class="card setup-card mb-4">
<div class="card-body">
<h5 class="card-title">
<span class="step-number">2</span>
QR-Code scannen oder Code eingeben
</h5>
<div class="row mt-4">
<div class="col-md-6 text-center mb-4">
<p class="fw-bold">Option A: QR-Code scannen</p>
<div class="qr-container">
<img src="data:image/png;base64,{{ qr_code }}" alt="2FA QR Code" style="max-width: 250px;">
</div>
<p class="text-muted mt-2">
<small>Öffnen Sie Ihre Authenticator-App und scannen Sie diesen Code</small>
</p>
</div>
<div class="col-md-6 mb-4">
<p class="fw-bold">Option B: Code manuell eingeben</p>
<div class="mb-3">
<label class="text-muted small">Account-Name:</label>
<div class="alert alert-light py-2">
<strong>V2 Admin Panel</strong>
</div>
</div>
<div class="mb-3">
<label class="text-muted small">Geheimer Schlüssel:</label>
<div class="secret-code">{{ totp_secret }}</div>
<button type="button" class="btn btn-sm btn-outline-primary mt-2" onclick="copySecret()">
📋 Schlüssel kopieren
</button>
</div>
<div class="alert alert-warning">
<small>
<strong>⚠️ Wichtiger Hinweis:</strong><br>
Speichern Sie diesen Code sicher. Er ist Ihre einzige Möglichkeit,
2FA auf einem neuen Gerät einzurichten.
</small>
</div>
</div>
</div>
</div>
</div>
<!-- Step 3: Verify -->
<div class="card setup-card mb-4">
<div class="card-body">
<h5 class="card-title">
<span class="step-number">3</span>
Code verifizieren
</h5>
<p class="ms-5">Geben Sie den 6-stelligen Code aus Ihrer Authenticator-App ein:</p>
<form method="POST" action="{{ url_for('enable_2fa') }}" class="ms-5 me-5">
<div class="row align-items-center">
<div class="col-md-6 mb-3">
<input type="text"
class="form-control code-input"
id="token"
name="token"
placeholder="000000"
maxlength="6"
pattern="[0-9]{6}"
autocomplete="off"
autofocus
required>
<div class="form-text text-center">Der Code ändert sich alle 30 Sekunden</div>
</div>
<div class="col-md-6 mb-3">
<button type="submit" class="btn btn-success btn-lg w-100">
✅ 2FA aktivieren
</button>
</div>
</div>
</form>
</div>
</div>
</div>
<script>
function copySecret() {
const secret = '{{ totp_secret }}';
navigator.clipboard.writeText(secret).then(function() {
alert('Code wurde in die Zwischenablage kopiert!');
});
}
// Auto-format the code input
document.getElementById('token').addEventListener('input', function(e) {
// Remove non-digits
e.target.value = e.target.value.replace(/\D/g, '');
});
</script>
{% endblock %}

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<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>2FA Verifizierung - Admin Panel</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
<style>
body {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
}
.login-container {
background: white;
padding: 2rem;
border-radius: 10px;
box-shadow: 0 0 20px rgba(0,0,0,0.1);
width: 100%;
max-width: 400px;
}
.logo {
text-align: center;
font-size: 3rem;
margin-bottom: 1rem;
}
.code-input {
text-align: center;
font-size: 1.5rem;
letter-spacing: 0.5rem;
font-family: monospace;
}
</style>
</head>
<body>
<div class="login-container">
<div class="logo">🔐</div>
<h2 class="text-center mb-4">Zwei-Faktor-Authentifizierung</h2>
{% with messages = get_flashed_messages(with_categories=true) %}
{% if messages %}
{% for category, message in messages %}
<div class="alert alert-{{ 'danger' if category == 'error' else category }} alert-dismissible fade show" role="alert">
{{ message }}
<button type="button" class="btn-close" data-bs-dismiss="alert"></button>
</div>
{% endfor %}
{% endif %}
{% endwith %}
<form method="POST">
<div class="mb-3">
<label for="token" class="form-label">Authentifizierungscode eingeben</label>
<input type="text"
class="form-control code-input"
id="token"
name="token"
placeholder="000000"
maxlength="6"
pattern="[0-9]{6}"
autocomplete="off"
autofocus
required>
<div class="form-text text-center mt-2">
Geben Sie den 6-stelligen Code aus Ihrer Authenticator-App ein
</div>
</div>
<div class="d-grid gap-2">
<button type="submit" class="btn btn-primary btn-lg">Verifizieren</button>
</div>
<div class="text-center mt-3">
<details>
<summary class="text-muted" style="cursor: pointer;">Backup-Code verwenden</summary>
<div class="mt-2">
<p class="small text-muted">
Falls Sie keinen Zugriff auf Ihre Authenticator-App haben,
können Sie einen 8-stelligen Backup-Code eingeben.
</p>
<input type="text"
class="form-control code-input mt-2"
id="backup-token"
placeholder="ABCD1234"
maxlength="8"
pattern="[A-Z0-9]{8}"
style="letter-spacing: 0.25rem;">
</div>
</details>
</div>
<hr class="my-4">
<div class="text-center">
<a href="/logout" class="text-muted">Abbrechen und zur Anmeldung zurück</a>
</div>
</form>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
<script>
// Auto-format the code input
document.getElementById('token').addEventListener('input', function(e) {
// Remove non-digits
e.target.value = e.target.value.replace(/\D/g, '');
});
// Handle backup code input
document.getElementById('backup-token').addEventListener('input', function(e) {
// Convert to uppercase and remove non-alphanumeric
e.target.value = e.target.value.toUpperCase().replace(/[^A-Z0-9]/g, '');
// If backup code is being used, copy to main token field
if (e.target.value.length > 0) {
document.getElementById('token').value = e.target.value;
document.getElementById('token').removeAttribute('pattern');
document.getElementById('token').setAttribute('maxlength', '8');
}
});
// Reset main field when typing in it
document.getElementById('token').addEventListener('focus', function(e) {
document.getElementById('backup-token').value = '';
e.target.setAttribute('pattern', '[0-9]{6}');
e.target.setAttribute('maxlength', '6');
});
</script>
</body>
</html>