fix(iap): acknowledge Google Play purchases only after the entitlement is persisted

server/supabase/functions/_shared/google-play-apply.test.ts

@@ -0,0 +1,334 @@
+import {
+  applyGooglePlayPurchase,
+  GOOGLE_PLAY_ACKNOWLEDGED_STATE,
+  type GooglePlayPurchaseApi,
+  type GooglePlayPurchaseStore,
+  type StoredGooglePlayPurchase,
+  type VerifiedGooglePlayPurchaseRecord,
+} from './google-play-apply.ts'
+import { GooglePlayVerificationError, sha256Hex, type NormalizedGooglePlayPurchase } from './google-play.ts'
+import {
+  classifyGooglePlayPersistenceError,
+  createSupabaseGooglePlayPurchaseStore,
+  GooglePlayPurchasePersistenceError,
+} from './google-play-purchase-store.ts'
+
+function assert(condition: boolean, message: string): asserts condition {
+  if (!condition) throw new Error(message)
+}
+
+const USER_ID = '11111111-2222-3333-4444-555555555555'
+const PRODUCT_ID = 'd3ro_voice_pro_monthly'
+const TOKEN = 'purchase-token-0001'
+const PENDING_ACK = 'ACKNOWLEDGEMENT_STATE_PENDING'
+
+function purchase(overrides: Partial<NormalizedGooglePlayPurchase> = {}): NormalizedGooglePlayPurchase {
+  return {
+    platform: 'google_play',
+    productId: PRODUCT_ID,
+    tier: 'pro',
+    storeTransactionId: 'GPA.1234-5678-9012-34567',
+    purchaseState: 'purchased',
+    purchaseAt: '2029-12-01T00:00:00Z',
+    expiresAt: '2030-01-01T00:00:00Z',
+    autoRenewing: true,
+    acknowledged: false,
+    entitled: true,
+    verification: {
+      subscriptionState: 'SUBSCRIPTION_STATE_ACTIVE',
+      acknowledgementState: PENDING_ACK,
+      lineItems: [{ productId: PRODUCT_ID, expiryTime: '2030-01-01T00:00:00Z' }],
+    },
+    linkedPurchaseToken: null,
+    ...overrides,
+  }
+}
+
+class FakePlayApi implements GooglePlayPurchaseApi {
+  verifyCalls = 0
+  acknowledged: Array<{ productId: string; purchaseToken: string }> = []
+  failAcknowledge = false
+  ownsLookup: ((token: string) => Promise<boolean>) | null = null
+  constructor(private readonly log: string[], private readonly result: NormalizedGooglePlayPurchase) {}
+  verify(
+    _userId: string,
+    _productId: string,
+    _purchaseToken: string,
+    ownsExpiredPurchaseToken: (token: string) => Promise<boolean>,
+  ): Promise<NormalizedGooglePlayPurchase> {
+    this.verifyCalls += 1
+    this.ownsLookup = ownsExpiredPurchaseToken
+    this.log.push('verify')
+    return Promise.resolve(this.result)
+  }
+  acknowledge(productId: string, purchaseToken: string): Promise<void> {
+    this.log.push('acknowledge')
+    if (this.failAcknowledge) {
+      return Promise.reject(new GooglePlayVerificationError('google_play_acknowledgement_failed', 502))
+    }
+    this.acknowledged.push({ productId, purchaseToken })
+    return Promise.resolve()
+  }
+}
+
+class FakeStore implements GooglePlayPurchaseStore {
+  applied: VerifiedGooglePlayPurchaseRecord[] = []
+  marked: Array<{ userId: string; purchaseToken: string }> = []
+  ownsQueries: Array<{ userId: string; purchaseToken: string }> = []
+  reject: GooglePlayPurchasePersistenceError | null = null
+  result: StoredGooglePlayPurchase = { applied: true, purchase_id: 'p-1', acknowledged: false }
+  constructor(private readonly log: string[]) {}
+  ownsPurchaseToken(userId: string, purchaseToken: string): Promise<boolean> {
+    this.ownsQueries.push({ userId, purchaseToken })
+    return Promise.resolve(true)
+  }
+  applyVerified(record: VerifiedGooglePlayPurchaseRecord): Promise<StoredGooglePlayPurchase> {
+    this.log.push('apply')
+    if (this.reject) return Promise.reject(this.reject)
+    this.applied.push(record)
+    return Promise.resolve(this.result)
+  }
+  markAcknowledged(userId: string, purchaseToken: string): Promise<void> {
+    this.log.push('mark')
+    this.marked.push({ userId, purchaseToken })
+    return Promise.resolve()
+  }
+}
+
+function setup(verified: NormalizedGooglePlayPurchase = purchase()) {
+  const log: string[] = []
+  const playApi = new FakePlayApi(log, verified)
+  const store = new FakeStore(log)
+  return { log, playApi, store }
+}
+
+const input = { userId: USER_ID, productId: PRODUCT_ID, purchaseToken: TOKEN }
+
+Deno.test('purchase rejected by the database is never acknowledged with Google', async () => {
+  for (const code of ['active_subscription_other_provider', 'purchase_owned_by_other_user'] as const) {
+    const { log, playApi, store } = setup()
+    store.reject = new GooglePlayPurchasePersistenceError(code)
+    let caught: unknown = null
+    try {
+      await applyGooglePlayPurchase({ playApi, store }, input)
+    } catch (error) {
+      caught = error
+    }
+    assert(caught instanceof GooglePlayPurchasePersistenceError && caught.code === code, `${code} must propagate`)
+    assert(playApi.acknowledged.length === 0, `${code}: rejected purchase must stay unacknowledged`)
+    assert(store.marked.length === 0, `${code}: rejected purchase must not be marked acknowledged`)
+    assert(log.join(',') === 'verify,apply', `${code}: unexpected call order ${log.join(',')}`)
+  }
+})
+
+Deno.test('accepted purchase is persisted unacknowledged, then acknowledged, then marked', async () => {
+  const { log, playApi, store } = setup()
+  const result = await applyGooglePlayPurchase({ playApi, store }, input)
+
+  assert(log.join(',') === 'verify,apply,acknowledge,mark', `unexpected call order ${log.join(',')}`)
+  assert(store.applied.length === 1, 'purchase must be persisted once')
+  const persisted = store.applied[0]
+  assert(persisted.userId === USER_ID && persisted.purchaseToken === TOKEN, 'persisted identity must match')
+  assert(persisted.purchase.acknowledged === false, 'persistence must record acknowledged=false before Google ack')
+  assert(
+    persisted.purchase.verification.acknowledgementState === GOOGLE_PLAY_ACKNOWLEDGED_STATE,
+    'entitled receipt must be stored in its canonical post-acknowledgement form',
+  )
+  assert(
+    playApi.acknowledged.length === 1
+      && playApi.acknowledged[0].productId === PRODUCT_ID
+      && playApi.acknowledged[0].purchaseToken === TOKEN,
+    'Google must be acknowledged for the verified product and token',
+  )
+  assert(store.marked.length === 1 && store.marked[0].userId === USER_ID, 'acknowledgement must be recorded')
+  assert(result.acknowledgedNow, 'result must report the acknowledgement')
+  assert(result.purchase.acknowledged, 'returned purchase must be acknowledged')
+  assert(
+    result.stored !== null && result.stored.acknowledged === true && result.stored.purchase_id === 'p-1',
+    'returned stored row must reflect the acknowledgement',
+  )
+})
+
+Deno.test('duplicate and stale persistence results are still acknowledged', async () => {
+  const results: StoredGooglePlayPurchase[] = [
+    { applied: false, duplicate: true, purchase_id: 'p-1', acknowledged: false },
+    { applied: false, duplicate: false, reason: 'stale_provider_event', purchase_id: 'p-1', acknowledged: false },
+  ]
+  for (const stored of results) {
+    const { playApi, store } = setup()
+    store.result = stored
+    await applyGooglePlayPurchase({ playApi, store }, input)
+    assert(playApi.acknowledged.length === 1, 'stored purchase must be acknowledged to avoid auto-refund')
+    assert(store.marked.length === 1, 'acknowledgement must be recorded')
+  }
+})
+
+Deno.test('failed Google acknowledgement leaves the stored purchase unacknowledged and propagates', async () => {
+  const { log, playApi, store } = setup()
+  playApi.failAcknowledge = true
+  let caught: unknown = null
+  try {
+    await applyGooglePlayPurchase({ playApi, store }, input)
+  } catch (error) {
+    caught = error
+  }
+  assert(
+    caught instanceof GooglePlayVerificationError && caught.code === 'google_play_acknowledgement_failed'
+      && caught.status === 502,
+    'acknowledgement failure must propagate as 502',
+  )
+  assert(store.applied.length === 1 && store.applied[0].purchase.acknowledged === false, 'row stays acknowledged=false')
+  assert(store.marked.length === 0, 'failed acknowledgement must not be recorded')
+  assert(log.join(',') === 'verify,apply,acknowledge', `unexpected call order ${log.join(',')}`)
+})
+
+Deno.test('already acknowledged purchase is persisted as acknowledged without another Google call', async () => {
+  const { playApi, store } = setup(purchase({
+    acknowledged: true,
+    verification: {
+      subscriptionState: 'SUBSCRIPTION_STATE_ACTIVE',
+      acknowledgementState: GOOGLE_PLAY_ACKNOWLEDGED_STATE,
+    },
+  }))
+  const result = await applyGooglePlayPurchase({ playApi, store }, input)
+  assert(store.applied[0].purchase.acknowledged === true, 'acknowledged purchase must persist acknowledged=true')
+  assert(playApi.acknowledged.length === 0 && store.marked.length === 0, 'no second acknowledgement')
+  assert(!result.acknowledgedNow && result.purchase.acknowledged, 'result must stay acknowledged')
+})
+
+Deno.test('non-entitled purchase is persisted verbatim and never acknowledged', async () => {
+  const { playApi, store } = setup(purchase({ entitled: false, purchaseState: 'pending' }))
+  const result = await applyGooglePlayPurchase({ playApi, store }, input)
+  assert(
+    store.applied[0].purchase.verification.acknowledgementState === PENDING_ACK,
+    'non-entitled receipt must keep Google acknowledgement state',
+  )
+  assert(playApi.acknowledged.length === 0 && store.marked.length === 0, 'non-entitled purchase must not be acknowledged')
+  assert(!result.purchase.acknowledged, 'result must stay unacknowledged')
+})
+
+Deno.test('preverified purchase skips Google verification but keeps the persist-then-acknowledge order', async () => {
+  const { log, playApi, store } = setup()
+  await applyGooglePlayPurchase({ playApi, store }, { ...input, preverified: purchase() })
+  assert(playApi.verifyCalls === 0, 'preverified purchase must not be verified again')
+  assert(log.join(',') === 'apply,acknowledge,mark', `unexpected call order ${log.join(',')}`)
+})
+
+Deno.test('expired-token ownership lookup is scoped to the purchasing user', async () => {
+  const { playApi, store } = setup()
+  await applyGooglePlayPurchase({ playApi, store }, input)
+  assert(playApi.ownsLookup !== null, 'verify must receive an ownership lookup')
+  assert(await playApi.ownsLookup('expired-token-0001'), 'lookup must delegate to the store')
+  assert(
+    store.ownsQueries.length === 1
+      && store.ownsQueries[0].userId === USER_ID
+      && store.ownsQueries[0].purchaseToken === 'expired-token-0001',
+    'lookup must be scoped to the purchasing user',
+  )
+})
+
+Deno.test('database exception messages map to stable persistence codes', () => {
+  assert(
+    classifyGooglePlayPersistenceError('purchase_owned_by_other_user') === 'purchase_owned_by_other_user',
+    'owner conflict must map',
+  )
+  assert(
+    classifyGooglePlayPersistenceError('linked_purchase_owned_by_other_user') === 'purchase_owned_by_other_user',
+    'linked owner conflict keeps its historical mapping',
+  )
+  assert(
+    classifyGooglePlayPersistenceError('active_subscription_other_provider') === 'active_subscription_other_provider',
+    'provider conflict must map',
+  )
+  assert(
+    classifyGooglePlayPersistenceError('provider_event_payload_mismatch') === 'purchase_persistence_failed',
+    'other failures must map to the generic code',
+  )
+})
+
+interface RecordedCall {
+  kind: 'rpc' | 'update'
+  name: string
+  args: Record<string, unknown>
+  filters: Array<[string, string, unknown]>
+}
+
+function fakeSupabaseClient(calls: RecordedCall[], rpcError: { message: string } | null = null) {
+  const client = {
+    rpc(name: string, args: Record<string, unknown>) {
+      calls.push({ kind: 'rpc', name, args, filters: [] })
+      return Promise.resolve(rpcError
+        ? { data: null, error: rpcError }
+        : { data: { applied: true, purchase_id: 'p-1', acknowledged: false }, error: null })
+    },
+    from(table: string) {
+      return {
+        update(values: Record<string, unknown>) {
+          const call: RecordedCall = { kind: 'update', name: table, args: values, filters: [] }
+          calls.push(call)
+          const chain = {
+            eq(column: string, value: unknown) {
+              call.filters.push(['eq', column, value])
+              return chain
+            },
+            is(column: string, value: unknown) {
+              call.filters.push(['is', column, value])
+              return Promise.resolve({ error: null })
+            },
+          }
+          return chain
+        },
+      }
+    },
+  }
+  return client as unknown as Parameters<typeof createSupabaseGooglePlayPurchaseStore>[0]
+}
+
+Deno.test('Supabase store maps the RPC with hashed tokens and records acknowledgement by direct update', async () => {
+  const calls: RecordedCall[] = []
+  const store = createSupabaseGooglePlayPurchaseStore(fakeSupabaseClient(calls))
+  const record = {
+    userId: USER_ID,
+    purchaseToken: TOKEN,
+    purchase: purchase({ linkedPurchaseToken: 'linked-token-0001' }),
+  }
+  const stored = await store.applyVerified(record)
+  await store.markAcknowledged(USER_ID, TOKEN)
+
+  const tokenHash = await sha256Hex(TOKEN)
+  const [rpc, update] = calls
+  assert(rpc.kind === 'rpc' && rpc.name === 'apply_verified_google_play_purchase', 'must call the purchase RPC')
+  assert(rpc.args.p_token_hash === tokenHash, 'token must be hashed')
+  assert(rpc.args.p_linked_token_hash === await sha256Hex('linked-token-0001'), 'linked token must be hashed')
+  assert(rpc.args.p_purchase_token === TOKEN && rpc.args.p_user_id === USER_ID, 'identity must be mapped')
+  assert(rpc.args.p_acknowledged === false, 'acknowledged flag must be forwarded')
+  assert(stored !== null && stored.purchase_id === 'p-1', 'RPC row must be returned')
+  assert(calls.filter((call) => call.kind === 'rpc').length === 1, 'acknowledgement must not re-enter the RPC')
+  assert(update.kind === 'update' && update.name === 'iap_purchases', 'acknowledgement must update iap_purchases')
+  assert(typeof update.args.acknowledged_at === 'string', 'acknowledged_at must be set')
+  assert(
+    JSON.stringify(update.filters) === JSON.stringify([
+      ['eq', 'platform', 'google_play'],
+      ['eq', 'user_id', USER_ID],
+      ['eq', 'token_hash', tokenHash],
+      ['is', 'acknowledged_at', null],
+    ]),
+    `unexpected update filters ${JSON.stringify(update.filters)}`,
+  )
+})
+
+Deno.test('Supabase store turns RPC rejections into persistence errors', async () => {
+  const store = createSupabaseGooglePlayPurchaseStore(
+    fakeSupabaseClient([], { message: 'active_subscription_other_provider' }),
+  )
+  let caught: unknown = null
+  try {
+    await store.applyVerified({ userId: USER_ID, purchaseToken: TOKEN, purchase: purchase() })
+  } catch (error) {
+    caught = error
+  }
+  assert(
+    caught instanceof GooglePlayPurchasePersistenceError && caught.code === 'active_subscription_other_provider',
+    'RPC rejection must surface as a typed persistence error',
+  )
+})

server/supabase/functions/_shared/google-play-apply.ts

@@ -0,0 +1,144 @@
+// Google Play purchase-application use case shared by iap-verify (client
+// initiated) and google-play-rtdn (Pub/Sub initiated).
+//
+// Ordering policy (the reason this lives in one place):
+//   1. verify the token with Google (or reuse a caller-supplied verification),
+//   2. persist the purchase and route the entitlement with acknowledged=false,
+//   3. acknowledge with Google only after the database accepted the purchase,
+//   4. record the acknowledgement on the stored purchase row.
+// A purchase the database rejects (another user owns it, another payment
+// provider holds or is creating the subscription, ...) is never acknowledged,
+// so Google's automatic refund of unacknowledged purchases still applies.
+//
+// IO is behind two ports so the policy is unit-testable without Google or
+// Supabase: GooglePlayPurchaseApi (Google Play Developer API) and
+// GooglePlayPurchaseStore (iap_purchases + apply_verified_google_play_purchase).
+
+import type { NormalizedGooglePlayPurchase } from './google-play.ts'
+
+export const GOOGLE_PLAY_ACKNOWLEDGED_STATE = 'ACKNOWLEDGEMENT_STATE_ACKNOWLEDGED'
+
+export interface GooglePlayPurchaseApi {
+  verify(
+    userId: string,
+    productId: string,
+    purchaseToken: string,
+    ownsExpiredPurchaseToken: (expiredPurchaseToken: string) => Promise<boolean>,
+  ): Promise<NormalizedGooglePlayPurchase>
+  acknowledge(productId: string, purchaseToken: string): Promise<void>
+}
+
+export interface VerifiedGooglePlayPurchaseRecord {
+  userId: string
+  purchaseToken: string
+  purchase: NormalizedGooglePlayPurchase
+}
+
+/** Row returned by apply_verified_google_play_purchase (opaque to the use case). */
+export type StoredGooglePlayPurchase = Record<string, unknown> | null
+
+export interface GooglePlayPurchaseStore {
+  /** True when `purchaseToken` is a Google Play purchase already stored for `userId`. */
+  ownsPurchaseToken(userId: string, purchaseToken: string): Promise<boolean>
+  /**
+   * Persists the verified purchase and routes its entitlement. Throws when the
+   * database rejects the purchase; nothing is stored in that case.
+   */
+  applyVerified(record: VerifiedGooglePlayPurchaseRecord): Promise<StoredGooglePlayPurchase>
+  /** Records a successful Google acknowledgement on the stored purchase row. */
+  markAcknowledged(userId: string, purchaseToken: string): Promise<void>
+}
+
+export interface ApplyGooglePlayPurchaseDeps {
+  playApi: GooglePlayPurchaseApi
+  store: GooglePlayPurchaseStore
+}
+
+export interface ApplyGooglePlayPurchaseInput {
+  userId: string
+  productId: string
+  purchaseToken: string
+  /** Verification already performed by the caller (RTDN out-of-app path). */
+  preverified?: NormalizedGooglePlayPurchase | null
+}
+
+export interface ApplyGooglePlayPurchaseResult {
+  /** Purchase as it stands after this call (acknowledged when acknowledged here). */
+  purchase: NormalizedGooglePlayPurchase
+  stored: StoredGooglePlayPurchase
+  acknowledgedNow: boolean
+}
+
+function withAcknowledgedVerification(
+  purchase: NormalizedGooglePlayPurchase,
+): NormalizedGooglePlayPurchase {
+  return {
+    ...purchase,
+    verification: {
+      ...purchase.verification,
+      acknowledgementState: GOOGLE_PLAY_ACKNOWLEDGED_STATE,
+    },
+  }
+}
+
+/**
+ * Receipt snapshot persisted for a purchase.
+ *
+ * The provider-event id (platform, token hash, state, expiry, entitlement)
+ * does not include the acknowledgement state, but the provider-event payload
+ * digest covers the whole verification document. An entitled purchase is
+ * therefore stored in its post-acknowledgement form, which is the same form
+ * Google returns on every later verification (client retry, RTDN) and the form
+ * earlier deployments stored. Keeping one canonical form avoids
+ * `provider_event_payload_mismatch` across the acknowledgement transition.
+ * Whether Google actually acknowledged it is tracked by
+ * iap_purchases.acknowledged_at (p_acknowledged + markAcknowledged).
+ */
+export function persistableGooglePlayPurchase(
+  purchase: NormalizedGooglePlayPurchase,
+): NormalizedGooglePlayPurchase {
+  return purchase.entitled ? withAcknowledgedVerification(purchase) : purchase
+}
+
+export function requiresGooglePlayAcknowledgement(purchase: NormalizedGooglePlayPurchase): boolean {
+  return purchase.entitled && !purchase.acknowledged
+}
+
+export async function applyGooglePlayPurchase(
+  deps: ApplyGooglePlayPurchaseDeps,
+  input: ApplyGooglePlayPurchaseInput,
+): Promise<ApplyGooglePlayPurchaseResult> {
+  const { playApi, store } = deps
+  const { userId, productId, purchaseToken } = input
+
+  const verified = input.preverified ?? await playApi.verify(
+    userId,
+    productId,
+    purchaseToken,
+    (expiredPurchaseToken) => store.ownsPurchaseToken(userId, expiredPurchaseToken),
+  )
+
+  // Persist first. A rejection throws here, before Google is told anything.
+  const stored = await store.applyVerified({
+    userId,
+    purchaseToken,
+    purchase: persistableGooglePlayPurchase(verified),
+  })
+
+  // Any successful persistence (applied, duplicate, or ignored as stale) keeps
+  // a valid stored purchase, so it must be acknowledged to avoid an automatic
+  // refund. A failed acknowledgement propagates; the row stays unacknowledged
+  // and the next verification (client retry or RTDN) acknowledges it.
+  if (!requiresGooglePlayAcknowledgement(verified)) {
+    return { purchase: verified, stored, acknowledgedNow: false }
+  }
+
+  await playApi.acknowledge(verified.productId, purchaseToken)
+  await store.markAcknowledged(userId, purchaseToken)
+
+  return {
+    purchase: { ...withAcknowledgedVerification(verified), acknowledged: true },
+    stored: stored === null ? null : { ...stored, acknowledged: true },
+    acknowledgedNow: true,
+  }
+}

server/supabase/functions/_shared/google-play-purchase-store.ts

@@ -0,0 +1,124 @@
+// Supabase adapter for GooglePlayPurchaseStore: iap_purchases lookups, the
+// apply_verified_google_play_purchase RPC parameter mapping (token hashing
+// included), and acknowledgement bookkeeping.
+
+import type { createClient } from '@supabase/supabase-js'
+import { sha256Hex } from './google-play.ts'
+import type {
+  GooglePlayPurchaseStore,
+  StoredGooglePlayPurchase,
+  VerifiedGooglePlayPurchaseRecord,
+} from './google-play-apply.ts'
+
+type SupabaseClient = ReturnType<typeof createClient>
+
+export type GooglePlayPersistenceErrorCode =
+  | 'purchase_owned_by_other_user'
+  | 'active_subscription_other_provider'
+  | 'purchase_persistence_failed'
+
+export class GooglePlayPurchasePersistenceError extends Error {
+  constructor(public readonly code: GooglePlayPersistenceErrorCode) {
+    super(code)
+    this.name = 'GooglePlayPurchasePersistenceError'
+  }
+}
+
+/**
+ * Maps a database exception message to the domain code callers act on.
+ * `linked_purchase_owned_by_other_user` intentionally maps to
+ * `purchase_owned_by_other_user` (substring match, as before extraction).
+ */
+export function classifyGooglePlayPersistenceError(message: string): GooglePlayPersistenceErrorCode {
+  if (message.includes('purchase_owned_by_other_user')) return 'purchase_owned_by_other_user'
+  if (message.includes('active_subscription_other_provider')) return 'active_subscription_other_provider'
+  return 'purchase_persistence_failed'
+}
+
+export interface RegisteredGooglePlayPurchase {
+  userId: string
+  productId: string
+}
+
+export interface SupabaseGooglePlayPurchaseStore extends GooglePlayPurchaseStore {
+  /** Stored Google Play purchase for this token regardless of owner, or null. */
+  findPurchase(purchaseToken: string): Promise<RegisteredGooglePlayPurchase | null>
+}
+
+export function createSupabaseGooglePlayPurchaseStore(
+  client: SupabaseClient,
+): SupabaseGooglePlayPurchaseStore {
+  return {
+    async findPurchase(purchaseToken) {
+      const { data, error } = await client
+        .from('iap_purchases')
+        .select('user_id, product_id')
+        .eq('platform', 'google_play')
+        .eq('token_hash', await sha256Hex(purchaseToken))
+        .maybeSingle()
+      if (error) throw new Error('purchase_lookup_failed')
+      if (data === null) return null
+      const row = data as { user_id?: unknown; product_id?: unknown }
+      if (typeof row.user_id !== 'string' || typeof row.product_id !== 'string') {
+        throw new Error('purchase_lookup_failed')
+      }
+      return { userId: row.user_id, productId: row.product_id }
+    },
+
+    async ownsPurchaseToken(userId, purchaseToken) {
+      const { data, error } = await client
+        .from('iap_purchases')
+        .select('id')
+        .eq('platform', 'google_play')
+        .eq('user_id', userId)
+        .eq('token_hash', await sha256Hex(purchaseToken))
+        .maybeSingle()
+      if (error) throw new Error('expired_purchase_lookup_failed')
+      return data !== null
+    },
+
+    async applyVerified(record: VerifiedGooglePlayPurchaseRecord): Promise<StoredGooglePlayPurchase> {
+      const { userId, purchaseToken, purchase } = record
+      const { data, error } = await client.rpc('apply_verified_google_play_purchase', {
+        p_user_id: userId,
+        p_platform: purchase.platform,
+        p_product_id: purchase.productId,
+        p_store_transaction_id: purchase.storeTransactionId,
+        p_token_hash: await sha256Hex(purchaseToken),
+        p_linked_token_hash: purchase.linkedPurchaseToken
+          ? await sha256Hex(purchase.linkedPurchaseToken)
+          : null,
+        p_purchase_token: purchaseToken,
+        p_purchase_state: purchase.purchaseState,
+        p_purchase_at: purchase.purchaseAt,
+        p_expires_at: purchase.expiresAt,
+        p_auto_renewing: purchase.autoRenewing,
+        p_acknowledged: purchase.acknowledged,
+        p_tier: purchase.tier,
+        p_entitled: purchase.entitled,
+        p_verification: purchase.verification,
+      })
+      if (error) {
+        throw new GooglePlayPurchasePersistenceError(
+          classifyGooglePlayPersistenceError(error.message ?? ''),
+        )
+      }
+      return data !== null && typeof data === 'object' && !Array.isArray(data)
+        ? data as Record<string, unknown>
+        : null
+    },
+
+    async markAcknowledged(userId, purchaseToken) {
+      // Direct update, not a second RPC call: re-applying the purchase would
+      // re-enter the provider-event ledger for bookkeeping only.
+      const { error } = await client
+        .from('iap_purchases')
+        .update({ acknowledged_at: new Date().toISOString() })
+        .eq('platform', 'google_play')
+        .eq('user_id', userId)
+        .eq('token_hash', await sha256Hex(purchaseToken))
+        .is('acknowledged_at', null)
+      if (error) throw new Error('purchase_acknowledgement_record_failed')
+    },
+  }
+}

server/supabase/functions/_shared/google-play.ts

@@ -416,3 +416,24 @@ export async function verifyGooglePlaySubscription(
     ownsExpiredPurchaseToken,
   )
 }
+
+/**
+ * Google Play Developer API adapter for the purchase-application use case
+ * (structurally satisfies GooglePlayPurchaseApi in google-play-apply.ts).
+ */
+export function createGooglePlayPurchaseApi(fetchImpl: typeof fetch = fetch): {
+  verify(
+    userId: string,
+    productId: string,
+    purchaseToken: string,
+    ownsExpiredPurchaseToken: (expiredPurchaseToken: string) => Promise<boolean>,
+  ): Promise<NormalizedGooglePlayPurchase>
+  acknowledge(productId: string, purchaseToken: string): Promise<void>
+} {
+  return {
+    verify: (userId, productId, purchaseToken, ownsExpiredPurchaseToken) =>
+      verifyGooglePlaySubscription(userId, productId, purchaseToken, fetchImpl, ownsExpiredPurchaseToken),
+    acknowledge: (productId, purchaseToken) =>
+      acknowledgeGooglePlaySubscription(productId, purchaseToken, fetchImpl),
+  }
+}

server/supabase/functions/google-play-rtdn/index.ts

@@ -1,14 +1,17 @@
 import { createServiceRoleClient } from '../_shared/quota.ts'
 import {
-  acknowledgeGooglePlaySubscription,
+  createGooglePlayPurchaseApi,
   fetchGooglePlaySubscription,
   GOOGLE_PLAY_PRODUCT_TIERS,
   GooglePlayVerificationError,
-  sha256Hex,
-  verifyGooglePlaySubscription,
   verifyGooglePlaySubscriptionPayload,
   type NormalizedGooglePlayPurchase,
 } from '../_shared/google-play.ts'
+import { applyGooglePlayPurchase } from '../_shared/google-play-apply.ts'
+import {
+  createSupabaseGooglePlayPurchaseStore,
+  type RegisteredGooglePlayPurchase,
+} from '../_shared/google-play-purchase-store.ts'
 import {
   GooglePubSubError,
   parseGooglePlayRtdn,
@@ -27,6 +30,7 @@ Deno.serve(async (req: Request) => {
 
   let eventId: string | null = null
   const serviceClient = createServiceRoleClient()
+  const purchaseStore = createSupabaseGooglePlayPurchaseStore(serviceClient)
   try {
     await verifyGooglePubSubIdentity(req)
     const notification = parseGooglePlayRtdn(await req.json())
@@ -34,16 +38,9 @@ Deno.serve(async (req: Request) => {
       return jsonResponse({ success: true, test: true })
     }
 
-    const currentTokenHash = await sha256Hex(notification.purchaseToken)
-    const { data: knownPurchase, error: purchaseError } = await serviceClient
-      .from('iap_purchases')
-      .select('user_id, product_id')
-      .eq('platform', 'google_play')
-      .eq('token_hash', currentTokenHash)
-      .maybeSingle()
-    if (purchaseError) throw new Error('purchase_lookup_failed')
-
-    let purchaseRecord = knownPurchase as { user_id?: unknown; product_id?: unknown } | null
+    let purchaseRecord: RegisteredGooglePlayPurchase | null = await purchaseStore.findPurchase(
+      notification.purchaseToken,
+    )
     let preverifiedPurchase: NormalizedGooglePlayPurchase | null = null
 
     // Google Play subscriptions-center re-subscriptions can notify the server
@@ -65,46 +62,21 @@ Deno.serve(async (req: Request) => {
         throw new GooglePubSubError('purchase_not_registered', 503)
       }
 
-      const { data: previousPurchase, error: previousError } = await serviceClient
-        .from('iap_purchases')
-        .select('user_id')
-        .eq('platform', 'google_play')
-        .eq('token_hash', await sha256Hex(expiredToken))
-        .maybeSingle()
-      if (previousError) throw new Error('previous_purchase_lookup_failed')
-      const previous = previousPurchase as { user_id?: unknown } | null
-      if (typeof previous?.user_id !== 'string') {
+      const previous = await purchaseStore.findPurchase(expiredToken)
+      if (!previous) {
         throw new GooglePubSubError('purchase_not_registered', 503)
       }
 
-      purchaseRecord = {
-        user_id: previous.user_id,
-        product_id: recognizedItems[0].productId,
-      }
+      const productId = recognizedItems[0].productId as string
+      purchaseRecord = { userId: previous.userId, productId }
       preverifiedPurchase = await verifyGooglePlaySubscriptionPayload(
-        previous.user_id,
-        recognizedItems[0].productId as string,
+        previous.userId,
+        productId,
         verification,
         (candidate) => Promise.resolve(candidate === expiredToken),
       )
     }
 
-    if (typeof purchaseRecord.user_id !== 'string' || typeof purchaseRecord.product_id !== 'string') {
-      throw new Error('purchase_lookup_failed')
-    }
-
-    const ownsExpiredPurchaseToken = async (expiredToken: string): Promise<boolean> => {
-      const { data: prior, error: priorError } = await serviceClient
-        .from('iap_purchases')
-        .select('id')
-        .eq('platform', 'google_play')
-        .eq('user_id', purchaseRecord.user_id as string)
-        .eq('token_hash', await sha256Hex(expiredToken))
-        .maybeSingle()
-      if (priorError) throw new Error('previous_purchase_lookup_failed')
-      return prior !== null
-    }
-
     const { data: insertedEvent, error: insertError } = await serviceClient
       .from('store_notification_events')
       .insert({
@@ -133,44 +105,15 @@ Deno.serve(async (req: Request) => {
       eventId = insertedRecord.id
     }
 
-    let purchase = preverifiedPurchase ?? await verifyGooglePlaySubscription(
-      purchaseRecord.user_id,
-      purchaseRecord.product_id,
-      notification.purchaseToken,
-      fetch,
-      ownsExpiredPurchaseToken,
-    )
-    if (purchase.entitled && !purchase.acknowledged) {
-      await acknowledgeGooglePlaySubscription(purchase.productId, notification.purchaseToken)
-      purchase = {
-        ...purchase,
-        acknowledged: true,
-        verification: {
-          ...purchase.verification,
-          acknowledgementState: 'ACKNOWLEDGEMENT_STATE_ACKNOWLEDGED',
+    await applyGooglePlayPurchase(
+      { playApi: createGooglePlayPurchaseApi(fetch), store: purchaseStore },
+      {
+        userId: purchaseRecord.userId,
+        productId: purchaseRecord.productId,
+        purchaseToken: notification.purchaseToken,
+        preverified: preverifiedPurchase,
       },
-      }
-    }
-    const { error: applyError } = await serviceClient.rpc('apply_verified_google_play_purchase', {
-      p_user_id: purchaseRecord.user_id,
-      p_platform: purchase.platform,
-      p_product_id: purchase.productId,
-      p_store_transaction_id: purchase.storeTransactionId,
-      p_token_hash: currentTokenHash,
-      p_linked_token_hash: purchase.linkedPurchaseToken
-        ? await sha256Hex(purchase.linkedPurchaseToken)
-        : null,
-      p_purchase_token: notification.purchaseToken,
-      p_purchase_state: purchase.purchaseState,
-      p_purchase_at: purchase.purchaseAt,
-      p_expires_at: purchase.expiresAt,
-      p_auto_renewing: purchase.autoRenewing,
-      p_acknowledged: purchase.acknowledged,
-      p_tier: purchase.tier,
-      p_entitled: purchase.entitled,
-      p_verification: purchase.verification,
-    })
-    if (applyError) throw new Error('purchase_persistence_failed')
+    )
     if (!eventId) throw new Error('notification_lookup_failed')
 
     const { error: completeError } = await serviceClient

server/supabase/functions/iap-verify/index.ts

@@ -2,11 +2,14 @@ import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
 import { authErrorResponse, requireUser, type AuthError } from '../_shared/auth.ts'
 import { createServiceRoleClient } from '../_shared/quota.ts'
 import {
-  acknowledgeGooglePlaySubscription,
+  createGooglePlayPurchaseApi,
   GooglePlayVerificationError,
-  sha256Hex,
-  verifyGooglePlaySubscription,
 } from '../_shared/google-play.ts'
+import { applyGooglePlayPurchase } from '../_shared/google-play-apply.ts'
+import {
+  createSupabaseGooglePlayPurchaseStore,
+  GooglePlayPurchasePersistenceError,
+} from '../_shared/google-play-purchase-store.ts'
 
 interface VerifyPurchaseRequest {
   platform?: unknown
@@ -40,69 +43,20 @@ Deno.serve(async (req: Request) => {
       return jsonResponse({ error: 'invalid_request' }, 400)
     }
 
-    const serviceClient = createServiceRoleClient()
-    const ownsExpiredPurchaseToken = async (expiredToken: string): Promise<boolean> => {
-      const { data: previous, error: previousError } = await serviceClient
-        .from('iap_purchases')
-        .select('id')
-        .eq('platform', 'google_play')
-        .eq('user_id', user.id)
-        .eq('token_hash', await sha256Hex(expiredToken))
-        .maybeSingle()
-      if (previousError) throw new Error('expired_purchase_lookup_failed')
-      return previous !== null
-    }
-
-    let purchase = await verifyGooglePlaySubscription(
-      user.id,
-      body.productId,
-      body.purchaseToken,
-      fetch,
-      ownsExpiredPurchaseToken,
-    )
-    if (purchase.entitled && !purchase.acknowledged) {
-      await acknowledgeGooglePlaySubscription(purchase.productId, body.purchaseToken)
-      purchase = {
-        ...purchase,
-        acknowledged: true,
-        verification: {
-          ...purchase.verification,
-          acknowledgementState: 'ACKNOWLEDGEMENT_STATE_ACKNOWLEDGED',
+    const { purchase, stored } = await applyGooglePlayPurchase(
+      {
+        playApi: createGooglePlayPurchaseApi(fetch),
+        store: createSupabaseGooglePlayPurchaseStore(createServiceRoleClient()),
       },
-      }
-    }
-    const { data, error } = await serviceClient.rpc('apply_verified_google_play_purchase', {
-      p_user_id: user.id,
-      p_platform: purchase.platform,
-      p_product_id: purchase.productId,
-      p_store_transaction_id: purchase.storeTransactionId,
-      p_token_hash: await sha256Hex(body.purchaseToken),
-      p_linked_token_hash: purchase.linkedPurchaseToken
-        ? await sha256Hex(purchase.linkedPurchaseToken)
-        : null,
-      p_purchase_token: body.purchaseToken,
-      p_purchase_state: purchase.purchaseState,
-      p_purchase_at: purchase.purchaseAt,
-      p_expires_at: purchase.expiresAt,
-      p_auto_renewing: purchase.autoRenewing,
-      p_acknowledged: purchase.acknowledged,
-      p_tier: purchase.tier,
-      p_entitled: purchase.entitled,
-      p_verification: purchase.verification,
-    })
-
-    if (error) {
-      if (error.message.includes('purchase_owned_by_other_user')) {
-        return jsonResponse({ error: 'purchase_owned_by_other_user' }, 409)
-      }
-      if (error.message.includes('active_subscription_other_provider')) {
-        return jsonResponse({ error: 'active_subscription_other_provider' }, 409)
-      }
-      throw new Error('purchase_persistence_failed')
-    }
+      {
+        userId: user.id,
+        productId: body.productId,
+        purchaseToken: body.purchaseToken,
+      },
+    )
 
     return jsonResponse({
-      purchase: data,
+      purchase: stored,
       verification: {
         product_id: purchase.productId,
         purchase_state: purchase.purchaseState,
@@ -122,6 +76,9 @@ Deno.serve(async (req: Request) => {
         return authErrorResponse(error as AuthError, corsHeaders)
       }
     }
+    if (error instanceof GooglePlayPurchasePersistenceError && error.code !== 'purchase_persistence_failed') {
+      return jsonResponse({ error: error.code }, 409)
+    }
     if (error instanceof GooglePlayVerificationError) {
       return jsonResponse({ error: error.code }, error.status)
     }