test: split Nostr backup integration cases

src/lnurlcash/nostrBackup.transport.cases.ts

@@ -0,0 +1,160 @@
+// Nostr backup: key derivation stability, event build/parse round-trips,
+// tamper rejection, publish/fetch and restore against an in-memory relay
+// (the transport is injected - no network), and the debounced publisher.
+
+import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest'
+import {bytesToHex} from '@noble/hashes/utils.js'
+import type {NostrEvent} from 'nostr-tools/core'
+import {finalizeEvent, getPublicKey} from 'nostr-tools/pure'
+import {v2 as nip44v2} from 'nostr-tools/nip44'
+import {buildNoteUrl} from 'lnurlcash-kit'
+
+import {deriveBearerAesKey, linkingPubKeyHex, saveLinkingKey} from './keys'
+import {
+  BACKUP_EVENT_KIND,
+  backupPubkey,
+  buildBackupEvent,
+  buildBackupEvents,
+  createBackupPublisher,
+  deriveBackupKey,
+  fetchBackup,
+  parseBackupEvent,
+  publishBackup,
+  restoreFromNostr,
+} from './nostrBackup'
+import type {BackupPartPayload, BackupTransport} from './nostrBackup'
+import {
+  loadBearers,
+  loadSettings,
+  mergeBearers,
+  persistBearer,
+  persistSettings,
+  readEncryptedBearers,
+} from './storage'
+import type {Bearer} from './types'
+import {addTrustedMint, isMintUnconfirmed, readTrustedMints} from './trustedMints'
+import {requiredValue, stubLocalStorage} from './test-utils'
+
+const LINKING_KEY = new Uint8Array(32).fill(7)
+const OTHER_KEY = new Uint8Array(32).fill(9)
+const OWNER_ID = linkingPubKeyHex(LINKING_KEY)
+
+const K1_A = 'aa'.repeat(32)
+const K1_B = 'bb'.repeat(32)
+const MINT_PUBKEY = 'ab'.repeat(33)
+
+// never connected - the recording transport below stands in for the relays
+const RELAYS = ['wss://relay-a.example', 'wss://relay-b.example']
+
+const bearerFixture = (overrides: Partial<Bearer> = {}): Bearer => ({
+  id: 'fixture',
+  url: buildNoteUrl('https://mint.example/w', K1_A, 21_000),
+  callback: 'https://mint.example/w/cb',
+  amount: 21_000,
+  verified: true,
+  createdAt: 1000,
+  updatedAt: 1000,
+  ...overrides,
+})
+
+// an in-memory relay set. It serves EVERY event it ever accepted, older
+// addressable copies included - like a relay that never replaces - which
+// is exactly the case fetchBackup's client-side latest-pick exists for
+const createRecordingTransport = (): {
+  transport: BackupTransport
+  events: NostrEvent[]
+} => {
+  const events: NostrEvent[] = []
+  const transport: BackupTransport = {
+    publish: (_relays, event) => {
+      events.push(event)
+      return Promise.resolve()
+    },
+    fetch: (_relays, filter) =>
+      Promise.resolve(
+        events.filter(
+          (e) =>
+            (!filter.kinds || filter.kinds.includes(e.kind)) &&
+            (!filter.authors || filter.authors.includes(e.pubkey)),
+        ),
+      ),
+  }
+  return {transport, events}
+}
+
+// flips the end of a base64 payload to different-but-valid characters
+const tamperContent = (content: string): string =>
+  content.slice(0, -4) + (content.endsWith('AAAA') ? 'BBBB' : 'AAAA')
+
+beforeEach(() => {
+  stubLocalStorage()
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+})
+
+describe('publishBackup / fetchBackup', () => {
+  const secretKey = deriveBackupKey(LINKING_KEY)
+
+  it('publishes every part and fetches them back decrypted', async () => {
+    const {transport} = createRecordingTransport()
+    const parts = {
+      notes: [{id: 'r1', iv: '00'.repeat(12), ciphertext: 'ab'.repeat(40)}],
+      mints: [{server: 'mint.example', mintPubkey: MINT_PUBKEY, addedAt: 1000, locked: false}],
+      settings: {defaultMint: 'mint.example'},
+    }
+    const published = await publishBackup(secretKey, parts, RELAYS, {transport})
+    expect(published.published).toEqual(['notes', 'mints', 'settings'])
+
+    const fetched = await fetchBackup(backupPubkey(secretKey), RELAYS, {
+      secretKey,
+      transport,
+    })
+    expect(fetched).toEqual(parts)
+  })
+
+  it('publishes nothing when no parts are given', async () => {
+    const {transport, events} = createRecordingTransport()
+    const result = await publishBackup(secretKey, {}, RELAYS, {transport})
+    expect(result.published).toEqual([])
+    expect(events).toEqual([])
+  })
+
+  it('picks the newest event per d-tag when a relay serves stale copies', async () => {
+    const {transport} = createRecordingTransport()
+    await publishBackup(secretKey, {settings: {defaultMint: 'old.example'}}, RELAYS, {
+      transport,
+      createdAt: 1000,
+    })
+    await publishBackup(secretKey, {settings: {defaultMint: 'new.example'}}, RELAYS, {
+      transport,
+      createdAt: 2000,
+    })
+    // the recording transport serves BOTH - the newer must win
+    const parts = await fetchBackup(backupPubkey(secretKey), RELAYS, {
+      secretKey,
+      transport,
+    })
+    expect(parts.settings).toEqual({defaultMint: 'new.example'})
+  })
+
+  it('falls back to an older valid copy when the newest event is tampered', async () => {
+    const {transport, events} = createRecordingTransport()
+    await publishBackup(secretKey, {settings: {defaultMint: 'mint.example'}}, RELAYS, {
+      transport,
+      createdAt: 1000,
+    })
+    const latest = requiredValue(events[0])
+    events.push({
+      ...latest,
+      content: tamperContent(latest.content),
+      created_at: 3000,
+    })
+    const parts = await fetchBackup(backupPubkey(secretKey), RELAYS, {
+      secretKey,
+      transport,
+    })
+    expect(parts.settings).toEqual({defaultMint: 'mint.example'})
+  })
+})