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* Account deletion cron job.
*
* Runs daily at 03:00 UTC:
* 1. Processes pending deletions past their execute date (hard delete)
* 2. Schedules inactive accounts for deletion (if enabled)
*
* Limited to 10 accounts per run for Firestore quota awareness.
*/
const { db, auth, FieldValue } = require('../utils/firebase');
const { generateId, now } = require('../utils/helpers');
const { queryDocs } = require('../utils/firestore-helpers');
const { sendEmail } = require('../utils/email');
const { buildDeletionCompleteEmail } = require('../utils/email-templates');
const r2 = require('../utils/r2');
const log = require('../utils/log');
const crypto = require('node:crypto');
const AUDIT_HASH_SECRET = process.env.AUDIT_HASH_SECRET;
Iif (!AUDIT_HASH_SECRET && process.env.NODE_ENV === 'production') {
log.error('cron', 'AUDIT_HASH_SECRET not set — audit log hashes will be insecure');
}
/**
* Delete docs in batches of 500.
*/
async function batchDeletePaths(paths) {
for (let i = 0; i < paths.length; i += 500) {
const batch = db.batch();
for (const path of paths.slice(i, i + 500)) {
batch.delete(db.doc(path));
}
await batch.commit();
}
}
/** Step 1: Send final email */
async function sendDeletionEmail(user, uniqueId) {
if (!user.email) return;
try {
const template = buildDeletionCompleteEmail();
await sendEmail(user.email, template.subject, template.html);
} catch (err) {
log.error('cron', 'Failed to send deletion complete email', { uniqueId, error: err.message });
}
}
/** Step 2: Delete R2 storage */
async function deleteUserR2Storage(uniqueId) {
const prefixes = [
`profiles/${uniqueId}/`,
`covers/${uniqueId}/`,
`messages/${uniqueId}/`,
`groups/${uniqueId}/`,
`evidence/${uniqueId}/`,
];
for (const prefix of prefixes) {
try {
const keys = await r2.listObjects(prefix);
if (keys.length > 0) await r2.deleteObjects(keys);
} catch (err) {
log.error('cron', 'Failed to delete R2 prefix', { prefix, error: err.message });
}
}
}
/** Delete a 1-on-1 conversation and all its subcollections. */
async function deleteOneOnOneConversation(convId) {
const [messages, userSettings, mutes] = await Promise.all([
queryDocs(db.collection(`conversations/${convId}/messages`)),
queryDocs(db.collection(`conversations/${convId}/userSettings`)),
queryDocs(db.collection(`conversations/${convId}/mutes`)),
]);
const allDocs = [
...messages.map((m) => `conversations/${convId}/messages/${m.id}`),
...userSettings.map((s) => `conversations/${convId}/userSettings/${s.id}`),
...mutes.map((m) => `conversations/${convId}/mutes/${m.id}`),
`conversations/${convId}`,
];
await batchDeletePaths(allDocs);
}
/** Remove user from a group conversation. */
async function removeUserFromGroupConversation(convId, uniqueId) {
await db.doc(`conversations/${convId}`).update({
participantIds: FieldValue.arrayRemove(Number(uniqueId)),
});
const [userSettings, mutes] = await Promise.all([
queryDocs(db.collection(`conversations/${convId}/userSettings`)),
queryDocs(db.collection(`conversations/${convId}/mutes`)),
]);
const toDelete = [
...userSettings
.filter((s) => s.userId === String(uniqueId))
.map((s) => `conversations/${convId}/userSettings/${s.id}`),
...mutes
.filter((m) => m.id === String(uniqueId))
.map((m) => `conversations/${convId}/mutes/${m.id}`),
];
for (const path of toDelete) {
await db.doc(path).delete();
}
}
/** Step 3: Cleanup conversations */
async function cleanupConversations(uniqueId) {
try {
const convSnap = await db
.collection('conversations')
.where('participantIds', 'array-contains', Number(uniqueId))
.get();
for (const convDoc of convSnap.docs) {
const participantCount = (convDoc.data().participantIds || []).length;
if (participantCount <= 2) {
await deleteOneOnOneConversation(convDoc.id);
} else {
await removeUserFromGroupConversation(convDoc.id, uniqueId);
}
}
} catch (err) {
log.error('cron', 'Failed to cleanup conversations', { uniqueId, error: err.message });
}
}
/** Delete a room and all its subcollections. */
async function deleteOwnedRoom(roomDocId) {
const [messages, seatRequests] = await Promise.all([
queryDocs(db.collection(`rooms/${roomDocId}/messages`)),
queryDocs(db.collection(`rooms/${roomDocId}/seatRequests`)),
]);
const allDocs = [
...messages.map((m) => `rooms/${roomDocId}/messages/${m.id}`),
...seatRequests.map((s) => `rooms/${roomDocId}/seatRequests/${s.id}`),
`rooms/${roomDocId}`,
];
await batchDeletePaths(allDocs);
}
/** Step 4: Cleanup rooms */
async function cleanupRooms(uniqueId) {
try {
const roomSnap = await db
.collection('rooms')
.where('participantIds', 'array-contains', Number(uniqueId))
.get();
for (const roomDoc of roomSnap.docs) {
if (String(roomDoc.data().ownerId) === uniqueId) {
await deleteOwnedRoom(roomDoc.id);
} else {
await db.doc(`rooms/${roomDoc.id}`).update({
participantIds: FieldValue.arrayRemove(Number(uniqueId)),
});
}
}
} catch (err) {
log.error('cron', 'Failed to cleanup rooms', { uniqueId, error: err.message });
}
}
/** Step 5: Remove from follower/following arrays */
async function cleanupFollowerFollowing(uniqueId) {
try {
const followerSnap = await db
.collection('users')
.where('followerIds', 'array-contains', Number(uniqueId))
.get();
for (const doc of followerSnap.docs) {
await db.doc(`users/${doc.id}`).update({
followerIds: FieldValue.arrayRemove(Number(uniqueId)),
});
}
const followingSnap = await db
.collection('users')
.where('followingIds', 'array-contains', Number(uniqueId))
.get();
for (const doc of followingSnap.docs) {
await db.doc(`users/${doc.id}`).update({
followingIds: FieldValue.arrayRemove(Number(uniqueId)),
});
}
} catch (err) {
log.error('cron', 'Failed to cleanup follower/following', { uniqueId, error: err.message });
}
}
/** Step 5b: Gift rankings cleanup */
async function cleanupGiftRankings(uniqueId) {
try {
const rankSnap = await db.collection('giftRankings').where('userId', '==', uniqueId).get();
for (const doc of rankSnap.docs) {
await db.doc(`giftRankings/${doc.id}`).delete();
}
} catch (err) {
log.error('cron', 'Failed to cleanup gift rankings', { uniqueId, error: err.message });
}
}
/** Step 6: Reports & appeals */
async function cleanupReportsAndAppeals(uniqueId) {
try {
const collections = ['reports', 'reportsArchive', 'suspensionAppeals'];
for (const col of collections) {
const snap1 = await db.collection(col).where('reportedUserId', '==', uniqueId).get();
for (const doc of snap1.docs) await db.doc(`${col}/${doc.id}`).delete();
const snap2 = await db.collection(col).where('reporterId', '==', uniqueId).get();
for (const doc of snap2.docs) await db.doc(`${col}/${doc.id}`).delete();
if (col === 'suspensionAppeals') {
const snap3 = await db.collection(col).where('userId', '==', uniqueId).get();
for (const doc of snap3.docs) await db.doc(`${col}/${doc.id}`).delete();
}
}
} catch (err) {
log.error('cron', 'Failed to cleanup reports/appeals', { uniqueId, error: err.message });
}
}
/**
* Step 6b: Suggestions-content cleanup (GDPR right-to-erasure cascade).
*
* The original hardDeleteAccount sequence omitted the suggestions footprint
* entirely, leaving deleted users still identifiable across the corpus via
* submitterUid / voterId / authorUid. This step closes that gap:
*
* 1. Anonymise own suggestions (preserve community value, redact identity)
* 2. Delete own votes via collectionGroup + decrement parent voteCount
* 3. Anonymise own comments via collectionGroup (preserve thread structure)
* 4. Delete subscription preferences doc
* 5. Delete inbox notifications
*
* Each sub-step is independently try/wrapped so a single failure does not
* abort the wider cron. Defensive parent-id check on collectionGroup hits
* future-proofs against unrelated `votes` / `comments` subcollections.
*
* Uses an anonymous sentinel of `submitterUid: 0` (no real user has uniqueId
* 0 — the floor is ≥1, with Officia=1) plus an explicit `submitterDeleted`
* flag so read-side code can distinguish anonymisation from a legitimate
* never-existed user.
*/
async function cleanupSuggestionsContent(uniqueId) {
const numericUid = Number(uniqueId);
const ANON = { uid: 0, deletedAt: now() };
try {
const sugSnap = await db
.collection('suggestions')
.where('submitterUid', '==', numericUid)
.get();
if (sugSnap.docs && sugSnap.docs.length > 0) {
let batch = db.batch();
let count = 0;
for (const doc of sugSnap.docs) {
batch.update(doc.ref, {
submitterUid: ANON.uid,
submitterDeleted: true,
submitterDeletedAt: ANON.deletedAt,
});
count++;
Iif (count === 500) {
await batch.commit();
batch = db.batch();
count = 0;
}
}
Eif (count > 0) await batch.commit();
}
} catch (err) {
log.error('cron', 'Failed to anonymise own suggestions', {
uniqueId,
error: err.message,
});
}
try {
const votesSnap = await db.collectionGroup('votes').where('voterId', '==', numericUid).get();
let batch = db.batch();
let count = 0;
for (const voteDoc of votesSnap.docs || []) {
const suggestionRef = voteDoc.ref.parent?.parent;
if (!suggestionRef || suggestionRef.parent?.id !== 'suggestions') continue;
const vote = voteDoc.data().vote;
const delta = vote === 'up' ? -1 : vote === 'down' ? 1 : 0;
batch.delete(voteDoc.ref);
if (delta !== 0) {
batch.update(suggestionRef, { voteCount: FieldValue.increment(delta) });
}
count++;
Iif (count >= 250) {
await batch.commit();
batch = db.batch();
count = 0;
}
}
if (count > 0) await batch.commit();
} catch (err) {
log.error('cron', 'Failed to delete suggestion votes', {
uniqueId,
error: err.message,
});
}
try {
const commentsSnap = await db
.collectionGroup('comments')
.where('authorUid', '==', numericUid)
.get();
let batch = db.batch();
let count = 0;
for (const commentDoc of commentsSnap.docs || []) {
const suggestionRef = commentDoc.ref.parent?.parent;
Iif (!suggestionRef || suggestionRef.parent?.id !== 'suggestions') continue;
batch.update(commentDoc.ref, {
authorUid: ANON.uid,
authorDeleted: true,
authorDeletedAt: ANON.deletedAt,
text: '[Comment from deleted user]',
});
count++;
Iif (count === 500) {
await batch.commit();
batch = db.batch();
count = 0;
}
}
if (count > 0) await batch.commit();
} catch (err) {
log.error('cron', 'Failed to anonymise suggestion comments', {
uniqueId,
error: err.message,
});
}
try {
await db.doc(`subscriptions/${uniqueId}`).delete();
} catch (err) {
log.error('cron', 'Failed to delete subscription preferences', {
uniqueId,
error: err.message,
});
}
try {
// Notifications today set both `uid` and `recipientUid` to the same value
// on every write path. Querying both fields and deduplicating by ref makes
// erasure forward-safe: if a future path writes only `recipientUid`, that
// record still gets deleted instead of silently surviving the cascade.
const [byUid, byRecipient] = await Promise.all([
db.collection('notifications').where('uid', '==', numericUid).get(),
db.collection('notifications').where('recipientUid', '==', numericUid).get(),
]);
const seen = new Set();
let batch = db.batch();
let count = 0;
for (const notifDoc of [...(byUid.docs || []), ...(byRecipient.docs || [])]) {
const path = notifDoc.ref.path;
if (seen.has(path)) continue;
seen.add(path);
batch.delete(notifDoc.ref);
count++;
Iif (count === 500) {
await batch.commit();
batch = db.batch();
count = 0;
}
}
if (count > 0) await batch.commit();
} catch (err) {
log.error('cron', 'Failed to delete notification inbox', {
uniqueId,
error: err.message,
});
}
}
/** Step 7: Auth-related cleanup */
async function cleanupAuthData(user, uniqueId) {
try {
const bioSnap = await db
.collection('biometricKeys')
.where('uniqueId', '==', Number(uniqueId))
.get();
for (const doc of bioSnap.docs) await db.doc(`biometricKeys/${doc.id}`).delete();
} catch (err) {
log.error('cron', 'Failed to cleanup biometric keys', { uniqueId, error: err.message });
}
if (user.email) {
try {
const otpSnap = await db.doc(`otpCodes/${user.email.toLowerCase()}`).get();
if (otpSnap.exists) await db.doc(`otpCodes/${user.email.toLowerCase()}`).delete();
const metricsSnap = await db.doc(`emailMetrics/${user.email.toLowerCase()}`).get();
if (metricsSnap.exists) await db.doc(`emailMetrics/${user.email.toLowerCase()}`).delete();
} catch (err) {
log.error('cron', 'Failed to cleanup OTP/email data', { uniqueId, error: err.message });
}
}
try {
const receiptSnap = await db
.collection('purchaseReceipts')
.where('userId', '==', uniqueId)
.get();
for (const doc of receiptSnap.docs) {
await db.doc(`purchaseReceipts/${doc.id}`).update({
markedForDeletion: true,
deletionScheduledAt: now() + 180 * 86400000,
});
}
} catch (err) {
log.error('cron', 'Failed to mark purchase receipts for deletion', {
uniqueId,
error: err.message,
});
}
}
/** Step 8: User doc + subcollections */
async function deleteUserDocAndSubcollections(uniqueId) {
try {
const subcollections = ['backpack', 'giftWall', 'transactions', 'warnings', 'stalkers'];
for (const sub of subcollections) {
const subDocs = await queryDocs(db.collection(`users/${uniqueId}/${sub}`));
await batchDeletePaths(subDocs.map((doc) => `users/${uniqueId}/${sub}/${doc.id}`));
}
await db.doc(`users/${uniqueId}`).delete();
} catch (err) {
log.error('cron', 'Failed to delete user doc', { uniqueId, error: err.message });
}
}
/** Step 9: Identity map soft-delete */
async function softDeleteIdentityMap(user, uniqueId) {
try {
const identitySnap = await db
.collection('identityMap')
.where('uniqueId', '==', Number(uniqueId))
.get();
for (const doc of identitySnap.docs) {
await db.doc(`identityMap/${doc.id}`).update({
unlinked: true,
unlinkedAt: now(),
deletedAccount: true,
deletionStanding: user.isSuspended ? 'suspended' : 'clean',
});
}
} catch (err) {
log.error('cron', 'Failed to soft-delete identity map', { uniqueId, error: err.message });
}
}
/** Step 10: Device bindings */
async function deleteDeviceBindings(uniqueId) {
try {
const bindingSnap = await db
.collection('deviceBindings')
.where('uniqueId', '==', Number(uniqueId))
.get();
for (const doc of bindingSnap.docs) await db.doc(`deviceBindings/${doc.id}`).delete();
} catch (err) {
log.error('cron', 'Failed to delete device bindings', { uniqueId, error: err.message });
}
}
/** Step 11: Firebase Auth user */
async function deleteFirebaseAuthUser(firebaseUid, uniqueId) {
try {
await auth.deleteUser(firebaseUid);
} catch (err) {
log.error('cron', 'Failed to delete Firebase Auth user', { uniqueId, error: err.message });
}
}
/**
* Hard-delete all data for a single user account.
* Follows the 12-step sequence from the design spec.
*/
async function hardDeleteAccount(userDoc) {
const user = userDoc.data();
const uniqueId = userDoc.id;
const firebaseUid = user.firebaseUid;
await sendDeletionEmail(user, uniqueId);
await deleteUserR2Storage(uniqueId);
await cleanupConversations(uniqueId);
await cleanupRooms(uniqueId);
await cleanupFollowerFollowing(uniqueId);
await cleanupGiftRankings(uniqueId);
await cleanupReportsAndAppeals(uniqueId);
await cleanupSuggestionsContent(uniqueId);
await cleanupAuthData(user, uniqueId);
await deleteUserDocAndSubcollections(uniqueId);
await softDeleteIdentityMap(user, uniqueId);
await deleteDeviceBindings(uniqueId);
await deleteFirebaseAuthUser(firebaseUid, uniqueId);
// Step 12: Audit log (zero PII)
const hashedUniqueId = crypto
.createHmac('sha256', AUDIT_HASH_SECRET || 'dev-audit-secret')
.update(String(uniqueId))
.digest('hex');
await db.doc(`adminAuditLog/${generateId()}`).set({
action: 'account_deleted',
timestamp: now(),
hashedUniqueId,
reason: user.deletionReason || 'unknown',
triggeredBy: 'system',
dataDeleted: [
'user',
'conversations',
'rooms',
'r2',
'reports',
'appeals',
'suggestions',
'votes',
'comments',
'subscriptions',
'notifications',
'auth',
'identity',
'deviceBindings',
],
standing: user.isSuspended ? 'suspended' : 'clean',
});
log.info('cron', 'Account hard-deleted', { uniqueId });
}
/**
* Main cron function: process pending deletions + schedule inactive accounts.
*/
async function accountDeletion() {
const timestamp = now();
// 1. Process pending deletions past their execute date
const pendingSnap = await db
.collection('users')
.where('deletionExecuteAt', '>', 0)
.where('deletionExecuteAt', '<=', timestamp)
.limit(10)
.get();
for (const doc of pendingSnap.docs) {
try {
// Re-read fresh doc to check if cancelled during processing
const freshSnap = await db.doc(`users/${doc.id}`).get();
Iif (!freshSnap.exists || !freshSnap.data().deletionExecuteAt) {
continue;
}
await hardDeleteAccount(freshSnap);
} catch (err) {
log.error('cron', 'Account deletion failed', { uniqueId: doc.id, error: err.message });
}
}
// 2. Schedule inactive accounts (if enabled)
const configSnap = await db.doc('config/app').get();
const config = configSnap.exists ? configSnap.data() : {};
const thresholdMonths = config.inactiveAccountDeleteMonths || 0;
if (thresholdMonths > 0) {
const cutoff = timestamp - thresholdMonths * 30 * 86400000;
const graceDays = config.accountDeletionGracePeriodDays || 30;
const inactiveSnap = await db
.collection('users')
.where('lastActiveAt', '<', cutoff)
.where('deletionScheduledAt', '==', null)
.where('isSuspended', '==', false)
.limit(10)
.get();
for (const doc of inactiveSnap.docs) {
try {
await db.doc(`users/${doc.id}`).update({
deletionScheduledAt: timestamp,
deletionReason: 'inactivity',
deletionExecuteAt: timestamp + graceDays * 86400000,
});
log.info('cron', 'Inactive account scheduled for deletion', { uniqueId: doc.id });
} catch (err) {
log.error('cron', 'Failed to schedule inactive account', {
uniqueId: doc.id,
error: err.message,
});
}
}
}
}
module.exports = accountDeletion;
module.exports.hardDeleteAccount = hardDeleteAccount;
module.exports._hardDeleteAccount = hardDeleteAccount;
|