From 49863532e16c592fefdae8518e434495e25cf24b Mon Sep 17 00:00:00 2001
From: donghyeon-ka <ehdgus6435@kumoh.ac.kr>
Date: Sat, 25 Jul 2026 16:39:01 +0900
Subject: [PATCH] test: verify federation keeps the AP1 contract

---
 docs/federation-spa-zero-change.md           | 16 +++++++
 e2e/federation-zero-change.mjs               | 46 ++++++++++++++++++++
 e2e/package.json                             |  3 +-
 scripts/verify-federation-spa-zero-change.sh | 11 +++++
 4 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 docs/federation-spa-zero-change.md
 create mode 100644 e2e/federation-zero-change.mjs
 create mode 100755 scripts/verify-federation-spa-zero-change.sh

diff --git a/docs/federation-spa-zero-change.md b/docs/federation-spa-zero-change.md
new file mode 100644
index 0000000..c8953b4
--- /dev/null
+++ b/docs/federation-spa-zero-change.md
@@ -0,0 +1,16 @@
+# Google federation without an AP1 application fork
+
+SPA는 Google SDK나 Google token endpoint를 알지 않는다. 기존 `spa-public`
+client로 Keycloak authorization endpoint를 호출하고, Keycloak 로그인
+화면에서 mock Google을 선택해도 callback, PKCE 교환, access token audience,
+Spring API 호출은 로컬 사용자 로그인과 동일하다.
+
+달라지는 곳은 Keycloak 앞단뿐이다.
+
+```text
+SPA -> Keycloak -> Google/mock OIDC
+SPA <- Keycloak access token <- Keycloak
+```
+
+`verify-federation-spa-zero-change.sh`는 기존 SPA 로그인 버튼에서 broker를
+선택하고, 변경 없는 callback과 `/api/me`가 200인지 실제 브라우저로 검증한다.
diff --git a/e2e/federation-zero-change.mjs b/e2e/federation-zero-change.mjs
new file mode 100644
index 0000000..f9f1be5
--- /dev/null
+++ b/e2e/federation-zero-change.mjs
@@ -0,0 +1,46 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const password = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(password);
+
+const browser = await chromium.launch({
+  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
+  headless: true,
+  args: ["--no-sandbox"],
+});
+
+try {
+  const page = await browser.newPage();
+  const tokenResponse = page.waitForResponse((response) =>
+    response.url().includes("/protocol/openid-connect/token")
+    && response.request().postData()?.includes("grant_type=authorization_code"),
+  );
+
+  await page.goto("http://localhost:8088/");
+  await page.locator("#login").click();
+  await page.locator('a[href*="/broker/mock-google/login"]').click();
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-new-user");
+  await page.locator("#password").fill(password);
+  await page.locator("#kc-login").click();
+
+  const response = await tokenResponse;
+  assert.equal(response.status(), 200);
+  const token = (await response.json()).access_token;
+  const payload = JSON.parse(
+    Buffer.from(token.split(".")[1], "base64url").toString(),
+  );
+  assert.match(payload.preferred_username, /^mock-google\./u);
+  assert.ok(payload.aud.includes("keycloak-pattern-api"));
+
+  await page.waitForURL("http://localhost:8088/");
+  await page.locator('[data-authenticated="true"]').waitFor();
+  await page.locator("#call-api").click();
+  await page.waitForFunction(() =>
+    document.querySelector("#result")?.textContent.includes('"httpStatus": 200'),
+  );
+  console.log("Google federation verified with the unchanged AP1 SPA/API contract");
+} finally {
+  await browser.close();
+}
diff --git a/e2e/package.json b/e2e/package.json
index 3f4a3a9..8edd6cc 100644
--- a/e2e/package.json
+++ b/e2e/package.json
@@ -5,7 +5,8 @@
   "type": "module",
   "scripts": {
     "test:pattern1": "node pattern1.mjs",
-    "test:role-mapping": "node role-mapping.mjs"
+    "test:role-mapping": "node role-mapping.mjs",
+    "test:federation-zero-change": "node federation-zero-change.mjs"
   },
   "devDependencies": {
     "playwright-core": "1.62.0"
diff --git a/scripts/verify-federation-spa-zero-change.sh b/scripts/verify-federation-spa-zero-change.sh
new file mode 100755
index 0000000..5533677
--- /dev/null
+++ b/scripts/verify-federation-spa-zero-change.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+set -eu
+
+set -a
+. ./.env
+set +a
+
+./scripts/set-first-broker-login-mode.sh secure
+npm --prefix e2e ci
+MOCK_GOOGLE_USER_PASSWORD="$MOCK_GOOGLE_USER_PASSWORD" \
+  npm --prefix e2e run test:federation-zero-change