Kakao 로그인(카카오 SDK · 서버 커스텀 토큰)과 LINE 로그인(Firebase OIDC) 연결 · SNS 연동 · 인증 취소 처리

2026-10-05 19:01:28 +09:00
parent f483e8d94b
commit c301f3a1db
23 changed files with 1179 additions and 53 deletions
@@ -0,0 +1,106 @@
+import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { getAuth } from 'firebase-admin/auth';
+
+import { bootAdmin, shutdownAdmin } from './support.js';
+import { fnAuthKakao, KAKAO_PROVIDER_ID, kakaoUidOf } from '../src/account/kakao.js';
+
+/** 카카오 커스텀 토큰 — 토큰 검증 · 기존 oidc.kakao 사용자 매핑 · 신규 UID · SNS 연동. */
+
+const APP_ID = '123456';
+const KAKAO_ID = '987654321';
+const OLD_UID = 'test-kakao-oidc-user';
+const GOOGLE_UID = 'test-kakao-google-user';
+
+type Req = Parameters<typeof fnAuthKakao.run>[0];
+const call = (data: Record<string, unknown>, uid?: string) =>
+  fnAuthKakao.run({ data, ...(uid ? { auth: { uid, token: {} } } : {}) } as Req);
+const codeOf = async (p: Promise<unknown>) => {
+  try { await p; return 'ok'; } catch (e) {
+    const d = (e as { details?: { code?: string; reason?: string } }).details;
+    return d?.reason ?? d?.code;
+  }
+};
+
+/** 카카오 API 흉내. 토큰 'good' 만 우리 앱 것, 'other-app' 은 남의 앱 토큰이다. */
+function stubKakao(email?: string) {
+  vi.stubGlobal('fetch', vi.fn(async (url: string, init: { headers: Record<string, string> }) => {
+    const token = init.headers.Authorization?.replace('Bearer ', '');
+    if (token === 'expired') return new Response('{}', { status: 401 });
+    if (url.endsWith('/v1/user/access_token_info')) {
+      return Response.json({ id: Number(KAKAO_ID), expires_in: 100, app_id: token === 'other-app' ? 1 : Number(APP_ID) });
+    }
+    return Response.json({
+      id: Number(KAKAO_ID),
+      kakao_account: {
+        profile: { nickname: '카카오팬' },
+        ...(email ? { email, is_email_valid: true, is_email_verified: true } : {}),
+      },
+    });
+  }));
+}
+
+async function wipe() {
+  const uids = [OLD_UID, GOOGLE_UID, kakaoUidOf(KAKAO_ID)];
+  await getAuth().deleteUsers(uids);
+}
+
+beforeAll(() => {
+  if (!process.env.FIREBASE_AUTH_EMULATOR_HOST) {
+    throw new Error('FIREBASE_AUTH_EMULATOR_HOST 가 없습니다. `npm run test:emulator` 로 실행하십시오.');
+  }
+  process.env.KAKAO_APP_ID = APP_ID;
+  bootAdmin();
+});
+afterAll(async () => { await wipe(); await shutdownAdmin(); });
+beforeEach(async () => { await wipe(); stubKakao(); });
+afterEach(() => { vi.unstubAllGlobals(); });
+
+describe('토큰 검증', () => {
+  it('만료·무효 토큰과 남의 앱 토큰은 E-AUTH-03', async () => {
+    expect(await codeOf(call({ accessToken: 'expired' }))).toBe('E-AUTH-03');
+    expect(await codeOf(call({ accessToken: 'other-app' }))).toBe('E-AUTH-03');
+  });
+});
+
+describe('로그인', () => {
+  it('OIDC 시절 oidc.kakao 가입자는 같은 UID 로 들어온다', async () => {
+    await getAuth().createUser({ uid: OLD_UID });
+    await getAuth().updateUser(OLD_UID, { providerToLink: { providerId: KAKAO_PROVIDER_ID, uid: KAKAO_ID } });
+    const { token } = await call({ accessToken: 'good' }) as { token: string };
+    expect(JSON.parse(Buffer.from(token.split('.')[1]!, 'base64url').toString()).uid).toBe(OLD_UID);
+  });
+
+  it('신규는 kakao:<회원번호> 로 만들고 oidc.kakao 를 붙인다 · 두 번째도 같은 UID', async () => {
+    const first = await call({ accessToken: 'good' }) as { token: string };
+    await call({ accessToken: 'good' });
+    const uid = JSON.parse(Buffer.from(first.token.split('.')[1]!, 'base64url').toString()).uid;
+    expect(uid).toBe(kakaoUidOf(KAKAO_ID));
+    const user = await getAuth().getUser(uid);
+    expect(user.displayName).toBe('카카오팬');
+    expect(user.providerData.map((d) => [d.providerId, d.uid])).toEqual([[KAKAO_PROVIDER_ID, KAKAO_ID]]);
+  });
+});
+
+describe('SNS 연동', () => {
+  it('로그인 없이 link 는 E-AUTH-03', async () => {
+    expect(await codeOf(call({ accessToken: 'good', link: true }))).toBe('E-AUTH-03');
+  });
+
+  it('Google 사용자에 붙인다 · 다른 UID 가 쓰는 카카오는 E-AUTH-08', async () => {
+    await getAuth().createUser({ uid: GOOGLE_UID, email: 'fan@fanuzu.co.kr' });
+    expect(await call({ accessToken: 'good', link: true }, GOOGLE_UID)).toEqual({ linked: true });
+    const user = await getAuth().getUser(GOOGLE_UID);
+    expect(user.providerData.some((d) => d.providerId === KAKAO_PROVIDER_ID && d.uid === KAKAO_ID)).toBe(true);
+
+    await getAuth().createUser({ uid: OLD_UID });
+    expect(await codeOf(call({ accessToken: 'good', link: true }, OLD_UID))).toBe('E-AUTH-08');
+  });
+
+  it('이메일이 다르면 붙이지 않는다(different-email) · 카카오 이메일이 없으면 비교를 건너뛴다', async () => {
+    await getAuth().createUser({ uid: GOOGLE_UID, email: 'fan@fanuzu.co.kr' });
+    stubKakao('other@kakao.com');
+    expect(await codeOf(call({ accessToken: 'good', link: true }, GOOGLE_UID))).toBe('different-email');
+    stubKakao('FAN@fanuzu.co.kr');
+    expect(await call({ accessToken: 'good', link: true }, GOOGLE_UID)).toEqual({ linked: true });
+  });
+});