test: 建立桌面端自动化回归测试体系并完善跨平台 CI

(cherry picked from commit 74267ae2f63f8256c3da84b04f5b330e6e9d4c67)

tests/unit/image-decrypt.test.ts

@@ -0,0 +1,56 @@
+import crypto from 'crypto'
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'fs'
+import { tmpdir } from 'os'
+import { join } from 'path'
+import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest'
+
+const root = mkdtempSync(join(tmpdir(), 'wxe-image-test-'))
+
+vi.mock('electron', () => ({ app: { getPath: () => root } }))
+vi.mock('../../src/main/services/settings-store', () => ({
+  loadSettings: () => ({ ffmpegPath: '' })
+}))
+vi.mock('../../src/main/wcdb4-client', () => ({ Wcdb4Client: class {} }))
+
+import { ImageDecryptService } from '../../src/main/image-decrypt-service'
+
+const aesKey = '0123456789abcdef'
+const xorKey = 0x40
+
+function writeV2Dat(file: string): Buffer {
+  const aesPlain = Buffer.from([0x89, 0x50, 0x4e, 0x47, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
+  const padded = Buffer.concat([aesPlain, Buffer.alloc(16, 16)])
+  const cipher = crypto.createCipheriv('aes-128-ecb', Buffer.from(aesKey, 'ascii'), null)
+  cipher.setAutoPadding(false)
+  const encrypted = Buffer.concat([cipher.update(padded), cipher.final()])
+  const raw = Buffer.from([13, 14])
+  const tailPlain = Buffer.from([15, 16])
+  const tailCipher = Buffer.from(tailPlain.map((value) => value ^ xorKey))
+  const header = Buffer.alloc(15)
+  Buffer.from([0x07, 0x08, 0x56, 0x32, 0x08, 0x07]).copy(header)
+  header.writeInt32LE(aesPlain.length, 6)
+  header.writeInt32LE(tailPlain.length, 10)
+  writeFileSync(file, Buffer.concat([header, encrypted, raw, tailCipher]))
+  return Buffer.concat([aesPlain, raw, tailPlain])
+}
+
+describe('DAT image decryption', () => {
+  beforeAll(() => mkdirSync(root, { recursive: true }))
+  afterAll(() => rmSync(root, { recursive: true, force: true }))
+
+  it('decrypts a synthetic V2 AES/raw/XOR fixture', () => {
+    const file = join(root, 'fixture.dat')
+    const expected = writeV2Dat(file)
+    expect(new ImageDecryptService('0x40', aesKey).decryptImage(file)).toEqual(expected)
+  })
+
+  it('rejects the wrong AES key and unsupported legacy signatures accurately', () => {
+    const file = join(root, 'fixture.dat')
+    writeV2Dat(file)
+    expect(new ImageDecryptService('0x40', 'fedcba9876543210').decryptImage(file)).toBeNull()
+
+    const legacy = join(root, 'legacy.dat')
+    writeFileSync(legacy, Buffer.from([0xff, 0xd8, 0xff, 0x00]))
+    expect(new ImageDecryptService('0x40', aesKey).decryptImage(legacy)).toBeNull()
+  })
+})