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utils/accountLifecycle.js

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+const crypto = require('crypto')
+const mongoose = require('mongoose')
+const UserModel = require('../models/UserModel')
+const DeletedAccountTombstoneModel = require('../models/DeletedAccountTombstoneModel')
+const PostModel = require('../models/PostModel')
+const MessageModel = require('../models/MessageModel')
+const PostBookmarkModel = require('../models/PostBookmarkModel')
+const StoryModel = require('../models/StoryModel')
+const NotificationModel = require('../models/NotificationModel')
+const ExploreInteractionModel = require('../models/ExploreInteractionModel')
+const CourseModel = require('../models/CourseModel')
+const AdvertisingModel = require('../models/AdvertisingModel')
+const AcademyModel = require('../models/AcademyModel')
+
+const DEACTIVATION_LOCK_DAYS = 7
+const DEACTIVATION_PURGE_MONTHS = 6
+const DELETION_TOMBSTONE_DAYS = 30
+
+const MS_DAY = 24 * 60 * 60 * 1000
+
+function hashValue (value) {
+  if (!value) return null
+  return crypto
+    .createHash('sha256')
+    .update(String(value).trim().toLowerCase() + (process.env.APP_SECRET || 'modstagram'))
+    .digest('hex')
+}
+
+function isDeactivated (user) {
+  return user?.account_status === 'deactivated'
+}
+
+function isHiddenFromPublic (user) {
+  return isDeactivated(user)
+}
+
+function formatChatUserLabel (user) {
+  const name =
+    `${user?.first_name || ''} ${user?.last_name || ''}`.trim() ||
+    user?.user_name ||
+    'کاربر'
+  if (isDeactivated(user)) {
+    return `${name} (کاربر غیرفعال)`
+  }
+  return name
+}
+
+async function getHiddenUserIds () {
+  return UserModel.find({ account_status: 'deactivated' }).distinct('_id')
+}
+
+async function isMobileBlockedByTombstone (mobile) {
+  const hash = hashValue(mobile)
+  if (!hash) return false
+  const hit = await DeletedAccountTombstoneModel.findOne({
+    mobile_hash: hash,
+    expires_at: { $gt: new Date() }
+  }).lean()
+  return Boolean(hit)
+}
+
+async function isUsernameBlockedByTombstone (userName) {
+  const hash = hashValue(userName)
+  if (!hash) return false
+  const hit = await DeletedAccountTombstoneModel.findOne({
+    user_name_hash: hash,
+    expires_at: { $gt: new Date() }
+  }).lean()
+  return Boolean(hit)
+}
+
+async function createDeletionTombstone ({ mobile, userName }) {
+  const expiresAt = new Date(Date.now() + DELETION_TOMBSTONE_DAYS * MS_DAY)
+  await DeletedAccountTombstoneModel.create({
+    mobile_hash: hashValue(mobile),
+    user_name_hash: hashValue(userName),
+    expires_at: expiresAt
+  })
+}
+
+async function purgeUserData (userId) {
+  const uid = new mongoose.Types.ObjectId(String(userId))
+  await Promise.all([
+    PostModel.deleteMany({ user_id: uid }),
+    MessageModel.deleteMany({ $or: [{ senderId: uid }, { receiverId: uid }] }),
+    PostBookmarkModel.deleteMany({ userId: uid }),
+    StoryModel.deleteMany({ user_id: uid }),
+    NotificationModel.deleteMany({ user_id: uid }),
+    ExploreInteractionModel.deleteMany({
+      $or: [{ viewerId: uid }, { authorId: uid }]
+    }),
+    CourseModel.deleteMany({ user_id: uid }),
+    AdvertisingModel.deleteMany({ userId: uid }),
+    AcademyModel.deleteMany({ userId: uid })
+  ])
+}
+
+async function purgeExpiredDeactivatedAccounts () {
+  const now = new Date()
+  const due = await UserModel.find({
+    account_status: 'deactivated',
+    scheduled_purge_at: { $lte: now }
+  }).select('_id mobile user_name').lean()
+
+  for (const user of due) {
+    await purgeUserData(user._id)
+    await UserModel.deleteOne({ _id: user._id })
+  }
+  return due.length
+}
+
+async function purgeExpiredTombstones () {
+  await DeletedAccountTombstoneModel.deleteMany({
+    expires_at: { $lte: new Date() }
+  })
+}
+
+module.exports = {
+  DEACTIVATION_LOCK_DAYS,
+  DEACTIVATION_PURGE_MONTHS,
+  DELETION_TOMBSTONE_DAYS,
+  MS_DAY,
+  hashValue,
+  isDeactivated,
+  isHiddenFromPublic,
+  formatChatUserLabel,
+  getHiddenUserIds,
+  isMobileBlockedByTombstone,
+  isUsernameBlockedByTombstone,
+  createDeletionTombstone,
+  purgeUserData,
+  purgeExpiredDeactivatedAccounts,
+  purgeExpiredTombstones
+}