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* Data export routes — GDPR Article 20 data portability.
*
* POST /api/users/:uniqueId/data-export → Request export (owner, rate-limited)
* GET /api/users/:uniqueId/data-export/status → Poll export status (owner)
* GET /api/users/:uniqueId/data-export/download → Download ZIP (HMAC token)
*/
const node_crypto = require('node:crypto');
const router = require('express').Router();
const { db } = require('../utils/firebase');
const { generateId, now } = require('../utils/helpers');
const log = require('../utils/log');
const buildDataExport = require('../utils/data-export-builder');
const r2 = require('../utils/r2');
const { sendEmail } = require('../utils/email');
const { buildDataExportReadyEmail } = require('../utils/email-templates');
const RATE_LIMIT_MS = 24 * 60 * 60 * 1000; // 24 hours
const EXPORT_EXPIRY_MS = 48 * 60 * 60 * 1000; // 48 hours
Iif (!process.env.EXPORT_DOWNLOAD_SECRET && process.env.NODE_ENV === 'production') {
throw new Error('EXPORT_DOWNLOAD_SECRET is required in production');
}
const EXPORT_DOWNLOAD_SECRET = process.env.EXPORT_DOWNLOAD_SECRET || 'dev-export-secret';
// ─── Helper: ownership check ────────────────────────────────────
function requireOwner(req, res) {
const paramId = Number(req.params.uniqueId);
if (req.auth.uniqueId !== paramId) {
res.status(403).json({ error: "Cannot access another user's data" });
return true;
}
return false;
}
function generateDownloadToken(uniqueId, expiresAt) {
const data = `${uniqueId}:${expiresAt}`;
return node_crypto.createHmac('sha256', EXPORT_DOWNLOAD_SECRET).update(data).digest('hex');
}
function verifyDownloadToken(uniqueId, expiresAt, token) {
const expected = generateDownloadToken(uniqueId, expiresAt);
return node_crypto.timingSafeEqual(Buffer.from(token, 'hex'), Buffer.from(expected, 'hex'));
}
// ═══════════════════════════════════════════════════════════════
// POST /api/users/:uniqueId/data-export — Request export
// ═══════════════════════════════════════════════════════════════
router.post('/users/:uniqueId/data-export', async (req, res) => {
try {
if (requireOwner(req, res)) return;
const uniqueId = req.params.uniqueId;
const userSnap = await db.doc(`users/${uniqueId}`).get();
if (!userSnap.exists) {
return res.status(404).json({ error: 'User not found' });
}
const user = userSnap.data();
// Rate limit: 24 hours
if (user.lastDataExportRequestedAt) {
const elapsed = now() - user.lastDataExportRequestedAt;
if (elapsed < RATE_LIMIT_MS) {
return res.status(429).json({ error: 'Please wait 24 hours between export requests' });
}
}
const timestamp = now();
// Update user doc
await db.doc(`users/${uniqueId}`).update({
lastDataExportRequestedAt: timestamp,
dataExportStatus: 'pending',
});
// Fire-and-forget async export
(async () => {
try {
const result = await buildDataExport(uniqueId);
const r2Key = `exports/${uniqueId}/${generateId()}.zip`;
// Upload to R2 with private cache headers
await r2.putObject(
r2Key,
result.buffer,
'application/zip',
{ expiresAt: String(timestamp + EXPORT_EXPIRY_MS) },
{ cacheControl: 'private, no-cache, no-store' },
);
const expiresAt = timestamp + EXPORT_EXPIRY_MS;
const downloadToken = generateDownloadToken(uniqueId, expiresAt);
const apiBase =
process.env.API_BASE_URL ||
(process.env.NODE_ENV === 'production'
? 'https://api.shytalk.shyden.co.uk'
: 'https://dev-api.shytalk.shyden.co.uk');
const downloadUrl = `${apiBase}/api/users/${uniqueId}/data-export/download?token=${downloadToken}&expiresAt=${expiresAt}`;
await db.doc(`users/${uniqueId}`).update({
dataExportStatus: 'ready',
dataExportR2Key: r2Key,
dataExportExpiresAt: expiresAt,
});
// Send email with download link
Eif (user.email) {
try {
const template = buildDataExportReadyEmail(
downloadUrl,
new Date(expiresAt).toISOString(),
);
await sendEmail(user.email, template.subject, template.html);
} catch (emailErr) {
log.error('data-export', 'Failed to send export email', {
error: emailErr.message,
});
}
}
log.info('data-export', 'Export ready', { uniqueId, r2Key });
} catch (err) {
log.error('data-export', 'Export build failed', {
uniqueId,
error: err.message,
});
await db
.doc(`users/${uniqueId}`)
.update({ dataExportStatus: 'failed' })
.catch(() => {});
}
})();
res.status(202).json({ requestedAt: timestamp });
} catch (err) {
log.error('data-export', 'Failed to request export', {
error: err.message,
});
res.status(500).json({ error: 'Internal server error' });
}
});
// ═══════════════════════════════════════════════════════════════
// GET /api/users/:uniqueId/data-export/status — Poll status
// ═══════════════════════════════════════════════════════════════
router.get('/users/:uniqueId/data-export/status', async (req, res) => {
try {
if (requireOwner(req, res)) return;
const uniqueId = req.params.uniqueId;
const userSnap = await db.doc(`users/${uniqueId}`).get();
if (!userSnap.exists) {
return res.status(404).json({ error: 'User not found' });
}
const user = userSnap.data();
const status = user.dataExportStatus || 'none';
res.json({
status,
requestedAt: user.lastDataExportRequestedAt || null,
readyAt: status === 'ready' ? user.lastDataExportRequestedAt : null,
expiresAt: user.dataExportExpiresAt || null,
});
} catch (err) {
log.error('data-export', 'Failed to get export status', {
error: err.message,
});
res.status(500).json({ error: 'Internal server error' });
}
});
// ═══════════════════════════════════════════════════════════════
// GET /api/users/:uniqueId/data-export/download — Download ZIP
// ═══════════════════════════════════════════════════════════════
router.get('/users/:uniqueId/data-export/download', async (req, res) => {
try {
const { token, expiresAt } = req.query;
const uniqueId = req.params.uniqueId;
if (!token || !expiresAt) {
return res.status(401).json({ error: 'Missing token or expiresAt' });
}
// Check expiry
const expiry = Number(expiresAt);
if (expiry <= Date.now()) {
return res.status(410).json({ error: 'Download link has expired' });
}
// Verify HMAC
try {
Iif (!verifyDownloadToken(uniqueId, expiresAt, token)) {
return res.status(401).json({ error: 'Invalid token' });
}
} catch {
return res.status(401).json({ error: 'Invalid token' });
}
// Get R2 key from user doc
const userSnap = await db.doc(`users/${uniqueId}`).get();
if (!userSnap.exists) {
return res.status(404).json({ error: 'User not found' });
}
const user = userSnap.data();
if (!user.dataExportR2Key) {
return res.status(404).json({ error: 'No export available' });
}
// Stream from R2
const r2Obj = await r2.getObject(user.dataExportR2Key);
res.setHeader('Content-Type', 'application/zip');
res.setHeader(
'Content-Disposition',
`attachment; filename="shytalk-data-export-${uniqueId}.zip"`,
);
r2Obj.Body.pipe(res);
} catch (err) {
log.error('data-export', 'Failed to download export', {
error: err.message,
});
res.status(500).json({ error: 'Internal server error' });
}
});
module.exports = router;
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