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const crypto = require('node:crypto');
const { authMiddlewareStrict } = require('../middleware/auth');
const { db, auth } = require('../utils/firebase');
const log = require('../utils/log');
const { sendEmail } = require('../utils/email');
const { buildOtpEmail } = require('../utils/email-templates');
const { encryptSecret, decryptSecret } = require('../utils/totp-crypto');
const { generateSecret, generateURI, verifySync } = require('otplib/functional');
const { NobleCryptoPlugin } = require('@otplib/plugin-crypto-noble');
const { ScureBase32Plugin } = require('@otplib/plugin-base32-scure');
// Instantiate otplib plugins once at module load
const otplibPlugins = { crypto: new NobleCryptoPlugin(), base32: new ScureBase32Plugin() };
// All portal routes use authMiddlewareStrict except totp-recovery (unauthenticated)
// Individual endpoints will be added in subsequent tasks
// Avatar URLs must be served from our CDN or localhost (local dev)
const TRUSTED_AVATAR_HOSTS = ['images.shytalk.shyden.co.uk', 'localhost', '127.0.0.1'];
const SUSPENSION_REASONS_ALLOWLIST = [
'Spamming',
'Harassment',
'Inappropriate content',
'Ban evasion',
'Terms violation',
'Other',
];
const TOTP_MAX_AGE_MS = 24 * 60 * 60 * 1000; // 24 hours
const TOTP_REPLAY_WINDOW_MS = 30_000;
const TOTP_CODE_FORMAT_RE = /^\d{6}$/;
// ═══════════════════════════════════════════════════════════════════
// Private helpers — shared TOTP lifecycle operations
//
// All helpers that can "fail" return { status, error } for the caller
// to forward via res.status(status).json({ error }), or null on success.
// Callers remain in full control of the response, matching the Express
// idiom used elsewhere in this codebase.
// ═══════════════════════════════════════════════════════════════════
/** Returns { status, error } if the code is not exactly 6 digits, else null. */
function validateCodeFormat(code) {
if (!code || typeof code !== 'string' || !TOTP_CODE_FORMAT_RE.test(code)) {
return { status: 400, error: 'Code must be exactly 6 digits' };
}
return null;
}
/** Returns true if this code was used within the replay window. */
function isReplay(totpData, code) {
return (
totpData.lastUsedCode === code &&
totpData.lastUsedAt &&
Date.now() - totpData.lastUsedAt < TOTP_REPLAY_WINDOW_MS
);
}
/** Reads the enrolled TOTP doc. Returns { data } on hit, { status, error } on miss. */
async function readEnrolledTotp(uniqueId) {
const snap = await db.doc(`users/${uniqueId}/private/totp`).get();
if (!snap.exists) {
return { status: 403, error: 'TOTP not enrolled' };
}
return { data: snap.data() };
}
/** Decrypts the stored secret and verifies the code via otplib. */
function verifyTotpCode(totpData, code) {
const secret = decryptSecret(totpData.encryptedSecret);
const result = verifySync({ token: code, secret, ...otplibPlugins });
return result.valid;
}
/**
* Clears totpVerified/totpVerifiedAt claims (preserving other claims like `admin`)
* and revokes all refresh tokens. Used by sign-out, revoke-all-sessions, and DELETE /portal/totp.
*/
async function clearTotpSessionAndRevoke(uid) {
const userRecord = await auth.getUser(uid);
const existingClaims = userRecord.customClaims || {};
await auth.setCustomUserClaims(uid, {
...existingClaims,
totpVerified: false,
totpVerifiedAt: null,
});
await auth.revokeRefreshTokens(uid);
}
/** Sets totpVerified:true with a fresh timestamp, preserving other claims. */
async function setTotpVerifiedClaim(uid) {
const userRecord = await auth.getUser(uid);
const existingClaims = userRecord.customClaims || {};
await auth.setCustomUserClaims(uid, {
...existingClaims,
totpVerified: true,
totpVerifiedAt: Date.now(),
});
}
/**
* GET /portal/me — Returns the authenticated user's portal-relevant data.
*
* This is the main portal entry point. Every portal page load calls this
* endpoint first. It determines what the user sees (dashboard, TOTP prompt,
* enrollment, suspension screen, or "download the app").
*/
router.get('/portal/me', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, token } = req.auth;
// 1. Read user doc from Firestore
const userSnap = await db.doc('users/' + uniqueId).get();
// 2. If user doc doesn't exist → 404
if (!userSnap.exists) {
return res.status(404).json({ error: 'User not found' });
}
const userData = userSnap.data();
// 3. Avatar URL validation: only allow trusted domains
let avatarUrl = userData.avatarUrl || null;
if (avatarUrl && !TRUSTED_AVATAR_HOSTS.some((host) => avatarUrl.includes(host))) {
avatarUrl = null;
}
// 4. Suspension reason sanitization
let suspensionReason = userData.suspensionReason || null;
if (suspensionReason && !SUSPENSION_REASONS_ALLOWLIST.includes(suspensionReason)) {
suspensionReason = null;
}
// 5. Convert suspensionEndDate to ISO string
let suspensionEndDate = null;
if (userData.suspensionEndDate) {
if (typeof userData.suspensionEndDate.toDate === 'function') {
// Firestore Timestamp
suspensionEndDate = userData.suspensionEndDate.toDate().toISOString();
} else if (userData.suspensionEndDate instanceof Date) {
suspensionEndDate = userData.suspensionEndDate.toISOString();
} else Eif (typeof userData.suspensionEndDate === 'string') {
suspensionEndDate = userData.suspensionEndDate;
}
}
// 6. Suspension check first — return early with suspension data
// (do NOT check TOTP — suspension takes precedence so user can see appeal screen)
if (userData.isSuspended) {
return res.status(200).json({
uniqueId,
displayName: userData.displayName || '',
avatarUrl,
userType: userData.userType || 'MEMBER',
isAdmin: token.admin === true,
isSuspended: true,
suspensionReason,
suspensionEndDate,
totpEnrolled: false, // Don't reveal TOTP status for suspended users
});
}
// 7. Read TOTP doc
const totpSnap = await db.doc('users/' + uniqueId + '/private/totp').get();
const totpEnrolled = totpSnap.exists;
// 8. TOTP enforcement for password users
const signInProvider = token.firebase?.sign_in_provider;
if (signInProvider === 'password' && totpEnrolled) {
if (!token.totpVerified) {
// Not verified at all
return res.status(403).json({ error: 'MFA required' });
}
// Check if totpVerifiedAt is missing or expired (> 24h)
const totpVerifiedAt = token.totpVerifiedAt;
if (!totpVerifiedAt || Date.now() - totpVerifiedAt > TOTP_MAX_AGE_MS) {
// Clear the expired claim
try {
const userRecord = await auth.getUser(req.auth.uid);
const existingClaims = userRecord.customClaims || {};
await auth.setCustomUserClaims(req.auth.uid, {
...existingClaims,
totpVerified: false,
totpVerifiedAt: null,
});
} catch (err) {
log.error('portal', 'Failed to clear expired TOTP claims', { error: err.message });
}
return res.status(403).json({ error: 'Re-verify TOTP' });
}
}
// 9. Return success response
return res.status(200).json({
uniqueId,
displayName: userData.displayName || '',
avatarUrl,
userType: userData.userType || 'MEMBER',
isAdmin: token.admin === true,
isSuspended: false,
suspensionReason: null,
suspensionEndDate: null,
totpEnrolled,
});
} catch (err) {
log.error('portal', 'GET /portal/me failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/totp/setup — Begin TOTP enrollment.
*
* Generates a TOTP secret, stores it encrypted in a pending doc,
* and returns the secret + otpauth URI for QR code rendering.
* Password provider only. Overwrites any existing pending doc (page refresh).
*/
router.post('/portal/totp/setup', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, token } = req.auth;
// 1. Verify password provider
if (token.firebase?.sign_in_provider !== 'password') {
return res.status(400).json({ error: 'Password provider required' });
}
// 2. Check if already enrolled
const totpSnap = await db.doc(`users/${uniqueId}/private/totp`).get();
if (totpSnap.exists) {
return res.status(409).json({ error: 'Already enrolled' });
}
// 3. Generate TOTP secret (length: 20 bytes → 32 BASE32 chars)
const secret = generateSecret({ length: 20, ...otplibPlugins });
// 4. Generate otpauth URI (email is URI-encoded in the label by generateURI)
const userEmail = token.email || '';
const qrCodeUrl = generateURI({
issuer: 'ShyTalk',
label: userEmail,
secret,
type: 'totp',
});
// 5. Encrypt the secret
const encryptedSecret = encryptSecret(secret);
// 6. Store in totp-pending (overwrites if already exists — handles page refresh)
await db.doc(`users/${uniqueId}/private/totp-pending`).set({
encryptedSecret,
expiresAt: Date.now() + 600000, // 10 minutes
attempts: 0,
});
// 7. Return secret and QR code URL
return res.status(200).json({ secret, qrCodeUrl });
} catch (err) {
log.error('portal', 'POST /portal/totp/setup failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/totp/confirm-setup — Confirm TOTP enrollment with a code.
*
* Validates the TOTP code against the pending secret, then promotes
* the secret to permanent storage and sets MFA claims.
*/
router.post('/portal/totp/confirm-setup', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, uid } = req.auth;
const { code } = req.body || {};
// 1. Validate code format
const formatErr = validateCodeFormat(code);
if (formatErr) return res.status(formatErr.status).json({ error: formatErr.error });
// 2. Read pending doc
const pendingSnap = await db.doc(`users/${uniqueId}/private/totp-pending`).get();
if (!pendingSnap.exists) {
return res.status(400).json({ error: 'No pending setup session' });
}
const pendingData = pendingSnap.data();
// 3. Check expiry
if (pendingData.expiresAt < Date.now()) {
return res.status(400).json({ error: 'Setup session expired' });
}
// 4. Check attempts (BEFORE incrementing)
if (pendingData.attempts >= 5) {
return res.status(429).json({ error: 'Too many attempts' });
}
// 5. Increment attempts
await db.doc(`users/${uniqueId}/private/totp-pending`).set({
...pendingData,
attempts: pendingData.attempts + 1,
});
// 6. Decrypt the pending secret (used both for verify and for re-encrypting on promote)
const secret = decryptSecret(pendingData.encryptedSecret);
// 7. Replay prevention against any pre-existing enrolled doc
const existingSnap = await db.doc(`users/${uniqueId}/private/totp`).get();
if (existingSnap.exists && isReplay(existingSnap.data(), code)) {
return res.status(401).json({ error: 'Code already used' });
}
// 8. Verify code (uses pending secret, not enrolled)
const result = verifySync({ token: code, secret, ...otplibPlugins });
if (!result.valid) {
return res.status(401).json({ error: 'Invalid code' });
}
// 9. Valid: store permanent doc (freshly encrypted), delete pending, set claim, revoke tokens
await db.doc(`users/${uniqueId}/private/totp`).set({
encryptedSecret: encryptSecret(secret),
createdAt: Date.now(),
lastUsedCode: code,
lastUsedAt: Date.now(),
});
await db.doc(`users/${uniqueId}/private/totp-pending`).delete();
await setTotpVerifiedClaim(uid);
await auth.revokeRefreshTokens(uid);
return res.status(200).json({ success: true });
} catch (err) {
log.error('portal', 'POST /portal/totp/confirm-setup failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/totp/verify — Verify TOTP code after sign-in.
*
* Called when a password user with TOTP enrolled signs in and needs
* to prove possession of their authenticator app. On success, sets
* the totpVerified custom claim so portal/me returns full dashboard data.
*/
router.post('/portal/totp/verify', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, uid, token } = req.auth;
const { code } = req.body || {};
// 1. Validate code format
const formatErr = validateCodeFormat(code);
if (formatErr) return res.status(formatErr.status).json({ error: formatErr.error });
// 2. Verify password provider
if (token.firebase?.sign_in_provider !== 'password') {
return res.status(400).json({ error: 'Password provider required' });
}
// 3. Read enrolled TOTP doc
const enrolled = await readEnrolledTotp(uniqueId);
if (enrolled.error) return res.status(enrolled.status).json({ error: enrolled.error });
const totpData = enrolled.data;
// 4. Replay prevention
if (isReplay(totpData, code)) {
return res.status(401).json({ error: 'Code already used' });
}
// 5. Decrypt + verify code
if (!verifyTotpCode(totpData, code)) {
return res.status(401).json({ error: 'Invalid code' });
}
// 6. Update TOTP doc with lastUsedCode/lastUsedAt
await db.doc(`users/${uniqueId}/private/totp`).set({
...totpData,
lastUsedCode: code,
lastUsedAt: Date.now(),
});
// 7. Set totpVerified claim
await setTotpVerifiedClaim(uid);
return res.status(200).json({ success: true });
} catch (err) {
log.error('portal', 'POST /portal/totp/verify failed', { error: err.message });
return res.status(503).json({ error: 'Internal server error' });
}
});
/**
* DELETE /portal/totp — Remove TOTP enrollment (re-enrollment flow).
*
* A logged-in user who wants to switch their authenticator app. Requires
* verifying their current TOTP code first. On success, deletes the TOTP doc,
* clears the totpVerified claim, and revokes all refresh tokens so the user
* must re-authenticate and re-enroll.
*/
router.delete('/portal/totp', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, uid } = req.auth;
const { totpCode } = req.body || {};
// 1. Validate code format
const formatErr = validateCodeFormat(totpCode);
if (formatErr) return res.status(formatErr.status).json({ error: formatErr.error });
// 2. Read enrolled TOTP doc
const enrolled = await readEnrolledTotp(uniqueId);
if (enrolled.error) return res.status(enrolled.status).json({ error: enrolled.error });
const totpData = enrolled.data;
// 3. Replay prevention
if (isReplay(totpData, totpCode)) {
return res.status(401).json({ error: 'Code already used' });
}
// 4. Decrypt + verify code
if (!verifyTotpCode(totpData, totpCode)) {
return res.status(401).json({ error: 'Invalid code' });
}
// 5. Delete enrollment and any pending setup
await db.doc(`users/${uniqueId}/private/totp`).delete();
await db.doc(`users/${uniqueId}/private/totp-pending`).delete();
// 6. Clear session claim and revoke tokens
await clearTotpSessionAndRevoke(uid);
return res.status(200).json({ success: true });
} catch (err) {
log.error('portal', 'DELETE /portal/totp failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/sign-out — Server-side sign-out.
*
* Clears the TOTP session claim and revokes all refresh tokens so the
* client is fully signed out. Other custom claims (e.g. admin) are preserved.
*/
router.post('/portal/sign-out', authMiddlewareStrict, async (req, res) => {
try {
await clearTotpSessionAndRevoke(req.auth.uid);
return res.status(200).json({ success: true });
} catch (err) {
log.error('portal', 'POST /portal/sign-out failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/revoke-all-sessions — Sign out of all devices.
*
* Password users must provide their current TOTP code to prevent
* unauthorised session revocation with a stolen token.
* OAuth users bypass TOTP (their provider handles 2FA).
*/
router.post('/portal/revoke-all-sessions', authMiddlewareStrict, async (req, res) => {
try {
const { uniqueId, uid, token } = req.auth;
const { totpCode } = req.body || {};
// Password users must re-prove ownership via TOTP; OAuth users can proceed directly.
if (token.firebase?.sign_in_provider === 'password') {
const formatErr = validateCodeFormat(totpCode);
if (formatErr) return res.status(formatErr.status).json({ error: formatErr.error });
const enrolled = await readEnrolledTotp(uniqueId);
if (enrolled.error) return res.status(enrolled.status).json({ error: enrolled.error });
const totpData = enrolled.data;
Iif (isReplay(totpData, totpCode)) {
return res.status(401).json({ error: 'Code already used' });
}
if (!verifyTotpCode(totpData, totpCode)) {
return res.status(401).json({ error: 'Invalid code' });
}
}
await clearTotpSessionAndRevoke(uid);
return res.status(200).json({ success: true });
} catch (err) {
log.error('portal', 'POST /portal/revoke-all-sessions failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
// ═══════════════════════════════════════════════════════════════════
// TOTP Recovery Routes (UNAUTHENTICATED)
// ═══════════════════════════════════════════════════════════════════
const RECOVERY_OTP_EXPIRY_MS = 10 * 60 * 1000; // 10 minutes
const RECOVERY_MAX_ATTEMPTS = 3;
function generateRecoveryOtp() {
return crypto.randomInt(100000, 999999).toString();
}
/**
* POST /portal/totp-recovery/send — Send a recovery OTP to email.
*
* UNAUTHENTICATED. For users who have lost their TOTP device.
* Always returns 200 regardless of whether the email exists or TOTP
* is enrolled (anti-enumeration).
*/
router.post('/portal/totp-recovery/send', async (req, res) => {
try {
const { email } = req.body || {};
// 1. Validate email field
if (!email || typeof email !== 'string' || email.trim().length === 0) {
return res.status(400).json({ error: 'Email is required' });
}
// 2. Validate email length
if (email.trim().length > 254) {
return res.status(400).json({ error: 'Email is too long' });
}
// 3. Normalize email
const normalizedEmail = email.trim().toLowerCase();
// 4. Look up Firebase user by email
let firebaseUser;
try {
firebaseUser = await auth.getUserByEmail(normalizedEmail);
} catch (_err) {
// User not found → return 200 (anti-enumeration)
return res.status(200).json({ message: 'Recovery code sent' });
}
// 5. Check if user has password provider
const providers = (firebaseUser.providerData || []).map((p) => p.providerId);
if (!providers.includes('password')) {
// No password provider → return 200 (same response, no email sent)
return res.status(200).json({ message: 'Recovery code sent' });
}
// 6. Resolve uniqueId from Firebase UID
const snap = await db
.collection('users')
.where('firebaseUid', '==', firebaseUser.uid)
.limit(1)
.get();
Iif (snap.empty) {
return res.status(200).json({ message: 'Recovery code sent' });
}
const uniqueId = snap.docs[0].data().uniqueId;
// 7. Check if TOTP is enrolled
const totpSnap = await db.doc(`users/${uniqueId}/private/totp`).get();
if (!totpSnap.exists) {
return res.status(200).json({ message: 'Recovery code sent' });
}
// 8. Generate OTP and store recovery code
const code = generateRecoveryOtp();
await db.doc(`totpRecoveryCodes/${normalizedEmail}`).set({
code,
expiresAt: Date.now() + RECOVERY_OTP_EXPIRY_MS,
attempts: 0,
});
// 9. Send email with recovery code
const template = buildOtpEmail(code);
await sendEmail(normalizedEmail, template.subject, template.html);
// 10. Return success
return res.status(200).json({ message: 'Recovery code sent' });
} catch (err) {
log.error('portal', 'POST /portal/totp-recovery/send failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
/**
* POST /portal/totp-recovery/verify — Verify recovery OTP and remove TOTP.
*
* UNAUTHENTICATED. On success, removes TOTP enrollment so the user
* can sign in with just their password and re-enroll.
*/
router.post('/portal/totp-recovery/verify', async (req, res) => {
try {
const { email, code } = req.body || {};
// 1. Validate fields
if (!email || typeof email !== 'string' || email.trim().length === 0) {
return res.status(400).json({ error: 'Email is required' });
}
if (!code || typeof code !== 'string' || code.trim().length === 0) {
return res.status(400).json({ error: 'Code is required' });
}
// 2. Normalize email
const normalizedEmail = email.trim().toLowerCase();
// 3. Read recovery code doc
const recoveryRef = db.doc(`totpRecoveryCodes/${normalizedEmail}`);
const recoverySnap = await recoveryRef.get();
if (!recoverySnap.exists) {
return res.status(401).json({ error: 'Invalid or expired code' });
}
const recoveryData = recoverySnap.data();
// 4. Check expiry
if (recoveryData.expiresAt < Date.now()) {
return res.status(401).json({ error: 'Invalid or expired code' });
}
// 5. Check attempts (rate limit per code)
if (recoveryData.attempts >= RECOVERY_MAX_ATTEMPTS) {
return res.status(429).json({ error: 'Too many attempts' });
}
// 6. Increment attempts
await recoveryRef.set({
...recoveryData,
attempts: recoveryData.attempts + 1,
});
// 7. Check code
if (recoveryData.code !== code) {
return res.status(401).json({ error: 'Invalid or expired code' });
}
// 8. Code matches — consume it
await recoveryRef.delete();
// 9. Look up Firebase user by email
const firebaseUser = await auth.getUserByEmail(normalizedEmail);
// 10. Resolve uniqueId from Firebase UID
const snap = await db
.collection('users')
.where('firebaseUid', '==', firebaseUser.uid)
.limit(1)
.get();
Eif (!snap.empty) {
const uniqueId = snap.docs[0].data().uniqueId;
// 11. Delete TOTP enrollment
await db.doc(`users/${uniqueId}/private/totp`).delete();
// 12. Delete pending TOTP (cleanup)
await db.doc(`users/${uniqueId}/private/totp-pending`).delete();
}
// 13. Revoke all refresh tokens
await auth.revokeRefreshTokens(firebaseUser.uid);
// 14. Return success
return res.status(200).json({
success: true,
message: 'Authenticator removed. Sign in and set up a new one.',
});
} catch (err) {
log.error('portal', 'POST /portal/totp-recovery/verify failed', { error: err.message });
return res.status(500).json({ error: 'Internal server error' });
}
});
module.exports = router;
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