feat(ap1): add vanilla SPA PKCE login

.gitignore

@@ -4,7 +4,6 @@
 *.iml
 
 backend/target/
-token-mediator/target/
 **/node_modules/
 frontend/dist/
 build/

README.md

@@ -97,15 +97,16 @@ Keycloak을 잠시 중지하고 export한 뒤 자동으로 다시 올립니다.
 runtime export에는 실제 client secret과 credential hash가 포함될 수 있어
 gitignored `build/keycloak-export/`에 권한 `0600`으로만 저장됩니다.
 
-## AP2: Token-Mediating Backend
+## AP1: SPA Direct + Resource Server
 
-`develop-keycloak-pattern2`의 Spring confidential client는
+`develop-keycloak-pattern1`은 vanilla JavaScript SPA가 `spa-public` client로
-`http://localhost:8082`에서 실행됩니다. 브라우저는 로그인 redirect와
+Authorization Code + PKCE S256 로그인을 수행하는 패턴입니다. access/refresh
-HttpOnly `AP2_SESSION`만 사용하고, authorization code 교환과
+token은 명시적인 in-memory store에만 보관되므로 새로고침하면 사라집니다.
-access/refresh token 보관은 backend가 담당합니다.
 
 ```bash
-./scripts/verify-pattern2.sh
+./scripts/verify-pattern1.sh
 ```
 
-`/token/boundary`는 실제 token 값을 반환하지 않고 서버 저장 여부만 보여줍니다.
+브라우저에서 `http://localhost:8088`을 열어 로그인한 뒤 보호 API를 호출할 수
+있습니다. SPA는 `http://localhost:8081/api/me`를 직접 호출하며 Spring
+Resource Server가 Bearer JWT를 검증합니다.

backend/src/main/java/com/example/keycloakpattern/SecurityConfig.java

@@ -1,11 +1,16 @@
 package com.example.keycloakpattern;
 
+import java.util.List;
+
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
 
 @Configuration
 public class SecurityConfig {
@@ -13,6 +18,7 @@ public class SecurityConfig {
     @Bean
     SecurityFilterChain apiSecurity(HttpSecurity http) throws Exception {
         return http
+            .cors(Customizer.withDefaults())
             .csrf(csrf -> csrf.disable())
             .sessionManagement(session ->
                 session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
@@ -24,4 +30,19 @@ public class SecurityConfig {
             .oauth2ResourceServer(oauth2 -> oauth2.jwt(Customizer.withDefaults()))
             .build();
     }
+
+    @Bean
+    CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration configuration = new CorsConfiguration();
+        configuration.setAllowedOrigins(List.of(
+            "http://localhost:8088",
+            "http://127.0.0.1:8088"
+        ));
+        configuration.setAllowedMethods(List.of("GET", "OPTIONS"));
+        configuration.setAllowedHeaders(List.of("Authorization", "Content-Type"));
+
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/api/**", configuration);
+        return source;
+    }
 }

docker-compose.yml

@@ -86,29 +86,6 @@ services:
       - keycloak-net
     restart: unless-stopped
 
-  token-mediator:
-    build:
-      context: ./token-mediator
-    environment:
-      SERVER_PORT: "8082"
-      KEYCLOAK_CLIENT_SECRET: ${TOKEN_MEDIATING_CLIENT_SECRET:?set TOKEN_MEDIATING_CLIENT_SECRET in .env}
-    ports:
-      - "127.0.0.1:8082:8082"
-    depends_on:
-      keycloak:
-        condition: service_healthy
-    healthcheck:
-      test:
-        - CMD-SHELL
-        - wget -q -O - http://127.0.0.1:8082/actuator/health | grep -q '"status":"UP"'
-      interval: 10s
-      timeout: 5s
-      retries: 12
-      start_period: 20s
-    networks:
-      - keycloak-net
-    restart: unless-stopped
-
   nginx:
     build:
       context: ./frontend

e2e/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "type": "module",
   "scripts": {
-    "test:pattern2": "node pattern2.mjs"
+    "test:pattern1": "node pattern1.mjs"
   },
   "devDependencies": {
     "playwright-core": "1.62.0"

e2e/pattern1.mjs

@@ -0,0 +1,71 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const username = process.env.E2E_USERNAME ?? "regular-user";
+const password = process.env.E2E_PASSWORD;
+
+assert.ok(password, "E2E_PASSWORD must be set");
+
+const browser = await chromium.launch({
+  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
+  headless: true,
+  args: ["--no-sandbox"],
+});
+
+try {
+  const context = await browser.newContext();
+  const page = await context.newPage();
+  let authorizationUrl;
+
+  page.on("request", (request) => {
+    if (request.url().includes("/protocol/openid-connect/auth")) {
+      authorizationUrl = new URL(request.url());
+    }
+  });
+
+  await page.goto("http://localhost:8088");
+  await page.locator("#login").click();
+  await page.waitForURL(/localhost:8080/u);
+  await page.locator("#username").fill(username);
+  await page.locator("#password").fill(password);
+  await page.locator("#kc-login").click();
+  await page.waitForURL("http://localhost:8088/");
+  await page.locator('[data-authenticated="true"]').waitFor();
+
+  assert.equal(authorizationUrl?.searchParams.get("response_type"), "code");
+  assert.equal(authorizationUrl?.searchParams.get("code_challenge_method"), "S256");
+  assert.ok(authorizationUrl?.searchParams.get("code_challenge"));
+
+  const accessToken = await page.evaluate(() => window.__pattern1.getAccessToken());
+  assert.ok(accessToken, "access token must exist in browser memory");
+
+  const storageSnapshot = await page.evaluate(() => ({
+    localStorage: Object.values(localStorage),
+    sessionStorage: Object.values(sessionStorage),
+  }));
+  assert.equal(
+    JSON.stringify(storageSnapshot).includes(accessToken),
+    false,
+    "access token must not be persisted in Web Storage",
+  );
+
+  await page.locator("#call-api").click();
+  await page.waitForFunction(() => {
+    const text = document.querySelector("#result")?.textContent ?? "";
+    return text.includes('"httpStatus": 200');
+  });
+
+  await page.reload();
+  await page.locator('[data-authenticated="false"]').waitFor();
+  assert.equal(
+    await page.evaluate(() => window.__pattern1.getAccessToken()),
+    null,
+    "reload must clear the memory-only token",
+  );
+
+  console.log(
+    "pattern1 browser verified: code+PKCE S256, protected API 200, Web Storage token 0, reload clears token",
+  );
+} finally {
+  await browser.close();
+}

e2e/pattern2.mjs

@@ -1,57 +0,0 @@
-import assert from "node:assert/strict";
-import { chromium } from "playwright-core";
-
-const password = process.env.E2E_PASSWORD;
-assert.ok(password, "E2E_PASSWORD must be set");
-
-const browser = await chromium.launch({
-  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
-  headless: true,
-  args: ["--no-sandbox"],
-});
-
-try {
-  const context = await browser.newContext();
-  const page = await context.newPage();
-
-  await page.goto("http://localhost:8082");
-  await page.locator("#login").click();
-  await page.waitForURL(/localhost:8080/u);
-  await page.locator("#username").fill(
-    process.env.E2E_USERNAME ?? "regular-user",
-  );
-  await page.locator("#password").fill(password);
-  await page.locator("#kc-login").click();
-  await page.waitForURL("http://localhost:8082/");
-
-  const boundaryResponsePromise = page.waitForResponse((response) =>
-    response.url().endsWith("/token/boundary"),
-  );
-  await page.locator("#inspect").click();
-  const boundaryResponse = await boundaryResponsePromise;
-  assert.equal(boundaryResponse.status(), 200);
-  const boundary = await boundaryResponse.json();
-
-  assert.equal(boundary.accessTokenStored, true);
-  assert.equal(boundary.refreshTokenStored, true);
-  assert.equal(boundary.browserReceivesRefreshToken, false);
-  assert.equal(JSON.stringify(boundary).includes("refresh_token"), false);
-
-  const cookies = await context.cookies("http://localhost:8082/");
-  const sessionCookie = cookies.find((cookie) => cookie.name === "AP2_SESSION");
-  assert.ok(sessionCookie);
-  assert.equal(sessionCookie.httpOnly, true);
-  assert.equal(sessionCookie.sameSite, "Lax");
-
-  const storage = await page.evaluate(() => ({
-    localStorage: Object.values(localStorage),
-    sessionStorage: Object.values(sessionStorage),
-  }));
-  assert.equal(JSON.stringify(storage).includes("refresh_token"), false);
-
-  console.log(
-    "pattern2 confidential client verified: server code exchange, server access/refresh custody, HttpOnly session",
-  );
-} finally {
-  await browser.close();
-}

frontend/Dockerfile

@@ -1,4 +1,16 @@
+FROM node:24-alpine AS build
+
+WORKDIR /workspace
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY src ./src
+COPY test ./test
+RUN npm test && npm run build
+
 FROM nginx:1.29-alpine
 
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY index.html /usr/share/nginx/html/index.html
+COPY --from=build /workspace/dist/app.js /usr/share/nginx/html/app.js

frontend/index.html

@@ -3,31 +3,66 @@
 <head>
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <title>Keycloak Authentication Patterns</title>
+  <meta name="referrer" content="no-referrer">
+  <title>AP1 · SPA Direct + Resource Server</title>
   <style>
     :root {
       color-scheme: light dark;
       font-family: system-ui, sans-serif;
     }
     body {
-      max-width: 48rem;
+      max-width: 56rem;
-      margin: 8vh auto;
+      margin: 6vh auto;
       padding: 0 1.5rem;
-      line-height: 1.6;
+      line-height: 1.55;
+    }
+    button {
+      margin: 0 0.5rem 0.5rem 0;
+      padding: 0.6rem 0.9rem;
+      cursor: pointer;
+    }
+    code, pre {
+      border-radius: 0.35rem;
+      background: color-mix(in srgb, CanvasText 9%, Canvas);
     }
     code {
-      padding: 0.15rem 0.35rem;
+      padding: 0.1rem 0.3rem;
-      border-radius: 0.25rem;
+    }
-      background: color-mix(in srgb, CanvasText 10%, Canvas);
+    pre {
+      min-height: 8rem;
+      padding: 1rem;
+      overflow: auto;
+      white-space: pre-wrap;
+    }
+    .notice {
+      border-left: 0.3rem solid #e09f3e;
+      padding-left: 1rem;
     }
   </style>
 </head>
 <body>
-  <h1>Keycloak Authentication Patterns</h1>
+  <main>
-  <p>공통 Docker Compose baseline이 실행 중입니다.</p>
+    <h1>AP1 · SPA Direct + Resource Server</h1>
-  <p>
+    <p>
-    공개 API는 <code>/api/public</code>, 보호 API는
+      바닐라 JavaScript SPA가 <code>spa-public</code> client로 Authorization
-    <code>/api/me</code>에서 확인할 수 있습니다.
+      Code + PKCE를 수행하고, access token을 직접 Spring Resource Server에
-  </p>
+      전달합니다.
+    </p>
+    <p class="notice">
+      access/refresh token은 메모리에만 존재합니다. 새로고침하면 사라지는 것이
+      이 패턴의 의도된 보안 경계입니다.
+    </p>
+
+    <section>
+      <button id="login" type="button">Keycloak 로그인</button>
+      <button id="call-api" type="button" disabled>보호 API 호출</button>
+      <button id="pkce-demo" type="button">수동 PKCE 생성</button>
+      <button id="logout" type="button" disabled>로그아웃</button>
+    </section>
+
+    <p id="session-state" data-authenticated="false">세션 확인 중…</p>
+    <pre id="result" aria-live="polite"></pre>
+  </main>
+  <script type="module" src="/app.js"></script>
 </body>
 </html>

frontend/nginx.conf

@@ -21,6 +21,7 @@ server {
     }
 
     location / {
+        add_header Cache-Control "no-store";
         try_files $uri $uri/ /index.html;
     }
 }

frontend/package-lock.json

@@ -0,0 +1,523 @@
+{
+  "name": "keycloak-pattern1-spa",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "keycloak-pattern1-spa",
+      "version": "1.0.0",
+      "dependencies": {
+        "oidc-client-ts": "3.5.0"
+      },
+      "devDependencies": {
+        "esbuild": "0.28.1"
+      }
+    },
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+      ],
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+        "@esbuild/win32-arm64": "0.28.1",
+        "@esbuild/win32-ia32": "0.28.1",
+        "@esbuild/win32-x64": "0.28.1"
+      }
+    },
+    "node_modules/jwt-decode": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jwt-decode/-/jwt-decode-4.0.0.tgz",
+      "integrity": "sha512-+KJGIyHgkGuIq3IEBNftfhW/LfWhXUIY6OmyVWjliu5KH1y0fw7VQ8YndE2O4qZdMSd9SqbnC8GOcZEy0Om7sA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/oidc-client-ts": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/oidc-client-ts/-/oidc-client-ts-3.5.0.tgz",
+      "integrity": "sha512-l2q8l9CTCTOlbX+AnK4p3M+4CEpKpyQhle6blQkdFhm0IsBqsxm15bYaSa11G7pWdsYr6epdsRZxJpCyCRbT8A==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "jwt-decode": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}

frontend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "keycloak-pattern1-spa",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "build": "esbuild src/app.js --bundle --format=esm --outfile=dist/app.js --minify --sourcemap",
+    "test": "node --test test/*.test.mjs"
+  },
+  "dependencies": {
+    "oidc-client-ts": "3.5.0"
+  },
+  "devDependencies": {
+    "esbuild": "0.28.1"
+  }
+}

frontend/src/app.js

@@ -0,0 +1,138 @@
+import {
+  InMemoryWebStorage,
+  UserManager,
+  WebStorageStateStore,
+} from "oidc-client-ts";
+
+import { createPkcePair } from "./pkce.js";
+
+const authority = "http://localhost:8080/realms/keycloak-patterns";
+const backendBaseUrl = "http://localhost:8081";
+
+const userManager = new UserManager({
+  authority,
+  client_id: "spa-public",
+  redirect_uri: "http://localhost:8088/callback.html",
+  post_logout_redirect_uri: "http://localhost:8088/",
+  response_type: "code",
+  scope: "openid profile email",
+  automaticSilentRenew: true,
+  monitorSession: false,
+  loadUserInfo: false,
+  userStore: new WebStorageStateStore({
+    store: new InMemoryWebStorage(),
+  }),
+  stateStore: new WebStorageStateStore({
+    store: window.sessionStorage,
+  }),
+});
+
+const loginButton = document.querySelector("#login");
+const logoutButton = document.querySelector("#logout");
+const apiButton = document.querySelector("#call-api");
+const pkceButton = document.querySelector("#pkce-demo");
+const sessionState = document.querySelector("#session-state");
+const result = document.querySelector("#result");
+
+let currentUser = null;
+
+function renderJson(value) {
+  result.textContent = JSON.stringify(value, null, 2);
+}
+
+function tokenMetadata(user) {
+  return {
+    subject: user.profile.sub,
+    username: user.profile.preferred_username,
+    expiresAt: new Date(user.expires_at * 1000).toISOString(),
+    accessTokenHeldBy: "browser memory",
+    refreshTokenHeldBy: user.refresh_token ? "browser memory" : "not issued",
+  };
+}
+
+function renderSession(user) {
+  currentUser = user;
+  const authenticated = Boolean(user && !user.expired);
+  sessionState.dataset.authenticated = String(authenticated);
+  sessionState.textContent = authenticated
+    ? `${user.profile.preferred_username} 로그인됨 · token은 메모리에만 보관`
+    : "로그인되지 않음 · 브라우저 저장소에 token 없음";
+  loginButton.disabled = authenticated;
+  logoutButton.disabled = !authenticated;
+  apiButton.disabled = !authenticated;
+
+  if (authenticated) {
+    renderJson(tokenMetadata(user));
+  }
+}
+
+async function finishSigninCallback() {
+  const params = new URLSearchParams(window.location.search);
+  const isCallback = window.location.pathname === "/callback.html"
+    && (params.has("code") || params.has("error"));
+
+  if (!isCallback) {
+    return null;
+  }
+
+  const user = await userManager.signinRedirectCallback();
+  window.history.replaceState({}, document.title, "/");
+  return user;
+}
+
+async function callProtectedApi() {
+  if (!currentUser || currentUser.expired) {
+    throw new Error("로그인이 필요합니다.");
+  }
+
+  const response = await fetch(`${backendBaseUrl}/api/me`, {
+    headers: {
+      Authorization: `Bearer ${currentUser.access_token}`,
+    },
+  });
+  const body = await response.json();
+  renderJson({
+    httpStatus: response.status,
+    resourceServerResponse: body,
+    tokenBoundary: tokenMetadata(currentUser),
+  });
+
+  if (!response.ok) {
+    throw new Error(`보호 API가 ${response.status}를 반환했습니다.`);
+  }
+}
+
+loginButton.addEventListener("click", () => userManager.signinRedirect());
+logoutButton.addEventListener("click", () => userManager.signoutRedirect());
+apiButton.addEventListener("click", () => {
+  callProtectedApi().catch((error) => renderJson({ error: error.message }));
+});
+pkceButton.addEventListener("click", () => {
+  createPkcePair()
+    .then(({ verifier, challenge, method }) => renderJson({
+      method,
+      verifierLength: verifier.length,
+      challengeLength: challenge.length,
+      note: "실제 로그인에서는 oidc-client-ts가 같은 S256 단계를 수행합니다.",
+    }))
+    .catch((error) => renderJson({ error: error.message }));
+});
+
+userManager.events.addUserLoaded(renderSession);
+userManager.events.addUserUnloaded(() => renderSession(null));
+userManager.events.addAccessTokenExpired(() => renderSession(null));
+
+window.__pattern1 = {
+  getAccessToken: () => currentUser?.access_token ?? null,
+  getRefreshToken: () => currentUser?.refresh_token ?? null,
+  getIdToken: () => currentUser?.id_token ?? null,
+  callProtectedApi,
+};
+
+try {
+  const callbackUser = await finishSigninCallback();
+  renderSession(callbackUser ?? await userManager.getUser());
+} catch (error) {
+  renderSession(null);
+  renderJson({ error: error.message });
+}

frontend/src/pkce.js

@@ -0,0 +1,26 @@
+function base64Url(bytes) {
+  let binary = "";
+  for (const byte of bytes) {
+    binary += String.fromCharCode(byte);
+  }
+  return btoa(binary)
+    .replaceAll("+", "-")
+    .replaceAll("/", "_")
+    .replace(/=+$/u, "");
+}
+
+export async function createPkcePair(cryptoApi = globalThis.crypto) {
+  const verifierBytes = new Uint8Array(32);
+  cryptoApi.getRandomValues(verifierBytes);
+  const verifier = base64Url(verifierBytes);
+  const digest = await cryptoApi.subtle.digest(
+    "SHA-256",
+    new TextEncoder().encode(verifier),
+  );
+
+  return {
+    verifier,
+    challenge: base64Url(new Uint8Array(digest)),
+    method: "S256",
+  };
+}

frontend/test/pkce.test.mjs

@@ -0,0 +1,18 @@
+import assert from "node:assert/strict";
+import { webcrypto } from "node:crypto";
+import test from "node:test";
+
+globalThis.btoa = (value) => Buffer.from(value, "binary").toString("base64");
+
+const { createPkcePair } = await import("../src/pkce.js");
+
+test("manual PKCE helper creates an RFC 7636 S256 pair", async () => {
+  const pair = await createPkcePair(webcrypto);
+
+  assert.equal(pair.method, "S256");
+  assert.equal(pair.verifier.length, 43);
+  assert.equal(pair.challenge.length, 43);
+  assert.match(pair.verifier, /^[A-Za-z0-9_-]+$/u);
+  assert.match(pair.challenge, /^[A-Za-z0-9_-]+$/u);
+  assert.notEqual(pair.verifier, pair.challenge);
+});

scripts/verify-pattern1.sh

@@ -2,7 +2,7 @@
 set -eu
 
 if [ ! -f .env ]; then
-  echo "missing .env; copy .env.example and set development values" >&2
+  echo "missing .env; copy .env.example and set local-only values" >&2
   exit 1
 fi
 
@@ -16,6 +16,6 @@ docker compose up --build -d --wait
 npm --prefix e2e ci
 E2E_USERNAME=regular-user \
 E2E_PASSWORD="$REGULAR_USER_PASSWORD" \
-  npm --prefix e2e run test:pattern2
+  npm --prefix e2e run test:pattern1
 
-echo "AP2 confidential client boundary verified"
+echo "AP1 verified end to end"

token-mediator/.dockerignore

@@ -1 +0,0 @@
-target/

token-mediator/Dockerfile

@@ -1,17 +0,0 @@
-FROM maven:3.9.11-eclipse-temurin-21-alpine AS build
-
-WORKDIR /workspace
-COPY pom.xml .
-RUN mvn --batch-mode dependency:go-offline
-COPY src src
-RUN mvn --batch-mode verify
-
-FROM eclipse-temurin:21-jre-alpine
-
-RUN addgroup -S spring && adduser -S spring -G spring
-WORKDIR /app
-COPY --from=build /workspace/target/keycloak-token-mediator.jar app.jar
-USER spring:spring
-
-EXPOSE 8082
-ENTRYPOINT ["java", "-jar", "/app/app.jar"]

token-mediator/pom.xml

@@ -1,58 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <parent>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.16</version>
-        <relativePath/>
-    </parent>
-
-    <groupId>com.example</groupId>
-    <artifactId>keycloak-token-mediator</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>keycloak-token-mediator</name>
-
-    <properties>
-        <java.version>21</java.version>
-    </properties>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-actuator</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-oauth2-client</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
-
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.security</groupId>
-            <artifactId>spring-security-test</artifactId>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <finalName>keycloak-token-mediator</finalName>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-            </plugin>
-        </plugins>
-    </build>
-</project>

token-mediator/src/main/java/com/example/keycloakpattern/mediator/SecurityConfig.java

@@ -1,29 +0,0 @@
-package com.example.keycloakpattern.mediator;
-
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.security.config.annotation.web.builders.HttpSecurity;
-import org.springframework.security.web.SecurityFilterChain;
-
-@Configuration
-public class SecurityConfig {
-
-    @Bean
-    SecurityFilterChain mediatorSecurity(HttpSecurity http) throws Exception {
-        return http
-            .authorizeHttpRequests(authorize -> authorize
-                .requestMatchers(
-                    "/",
-                    "/index.html",
-                    "/app.js",
-                    "/favicon.ico",
-                    "/actuator/health",
-                    "/actuator/health/**"
-                )
-                .permitAll()
-                .anyRequest()
-                .authenticated())
-            .oauth2Login(oauth2 -> oauth2.defaultSuccessUrl("/", true))
-            .build();
-    }
-}

token-mediator/src/main/java/com/example/keycloakpattern/mediator/TokenBoundaryController.java

@@ -1,44 +0,0 @@
-package com.example.keycloakpattern.mediator;
-
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-import org.springframework.http.CacheControl;
-import org.springframework.http.ResponseEntity;
-import org.springframework.security.core.Authentication;
-import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
-import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class TokenBoundaryController {
-
-    private final OAuth2AuthorizedClientService authorizedClientService;
-
-    public TokenBoundaryController(
-        OAuth2AuthorizedClientService authorizedClientService
-    ) {
-        this.authorizedClientService = authorizedClientService;
-    }
-
-    @GetMapping("/token/boundary")
-    ResponseEntity<Map<String, Object>> tokenBoundary(Authentication authentication) {
-        OAuth2AuthorizedClient client = authorizedClientService.loadAuthorizedClient(
-            "keycloak",
-            authentication.getName()
-        );
-
-        Map<String, Object> response = new LinkedHashMap<>();
-        response.put("pattern", "AP2-token-mediating-backend");
-        response.put("principal", authentication.getName());
-        response.put("accessTokenStored", client != null && client.getAccessToken() != null);
-        response.put("refreshTokenStored", client != null && client.getRefreshToken() != null);
-        response.put("browserReceivesRefreshToken", false);
-
-        return ResponseEntity.ok()
-            .cacheControl(CacheControl.noStore())
-            .header("Pragma", "no-cache")
-            .body(response);
-    }
-}

token-mediator/src/main/java/com/example/keycloakpattern/mediator/TokenMediatorApplication.java

@@ -1,12 +0,0 @@
-package com.example.keycloakpattern.mediator;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class TokenMediatorApplication {
-
-    public static void main(String[] args) {
-        SpringApplication.run(TokenMediatorApplication.class, args);
-    }
-}

token-mediator/src/main/resources/application.yml

@@ -1,44 +0,0 @@
-server:
-  port: ${SERVER_PORT:8082}
-  servlet:
-    session:
-      cookie:
-        name: AP2_SESSION
-        http-only: true
-        same-site: lax
-
-spring:
-  application:
-    name: keycloak-token-mediator
-  security:
-    oauth2:
-      client:
-        registration:
-          keycloak:
-            provider: keycloak
-            client-id: token-mediating-confidential
-            client-secret: ${KEYCLOAK_CLIENT_SECRET}
-            client-authentication-method: client_secret_basic
-            authorization-grant-type: authorization_code
-            redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
-            scope:
-              - openid
-              - profile
-              - email
-        provider:
-          keycloak:
-            authorization-uri: http://localhost:8080/realms/keycloak-patterns/protocol/openid-connect/auth
-            token-uri: http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/token
-            jwk-set-uri: http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/certs
-            user-info-uri: http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/userinfo
-            user-name-attribute: preferred_username
-
-management:
-  endpoint:
-    health:
-      probes:
-        enabled: true
-  endpoints:
-    web:
-      exposure:
-        include: health,info

token-mediator/src/main/resources/static/app.js

@@ -1,20 +0,0 @@
-const result = document.querySelector("#result");
-
-function render(value) {
-  result.textContent = JSON.stringify(value, null, 2);
-}
-
-document.querySelector("#login").addEventListener("click", () => {
-  window.location.assign("/oauth2/authorization/keycloak");
-});
-
-document.querySelector("#inspect").addEventListener("click", async () => {
-  const response = await fetch("/token/boundary", {
-    headers: { Accept: "application/json" },
-  });
-  if (response.redirected || response.status === 401) {
-    window.location.assign("/oauth2/authorization/keycloak");
-    return;
-  }
-  render(await response.json());
-});

token-mediator/src/main/resources/static/index.html

@@ -1,29 +0,0 @@
-<!doctype html>
-<html lang="ko">
-<head>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <title>AP2 · Token-Mediating Backend</title>
-  <style>
-    :root { color-scheme: light dark; font-family: system-ui, sans-serif; }
-    body { max-width: 52rem; margin: 6vh auto; padding: 0 1.5rem; line-height: 1.6; }
-    button { margin-right: 0.5rem; padding: 0.6rem 0.9rem; cursor: pointer; }
-    pre { min-height: 8rem; padding: 1rem; border-radius: 0.4rem;
-      background: color-mix(in srgb, CanvasText 9%, Canvas); white-space: pre-wrap; }
-  </style>
-</head>
-<body>
-  <main>
-    <h1>AP2 · Token-Mediating Backend</h1>
-    <p>
-      confidential backend가 authorization code를 token으로 교환합니다.
-      refresh token은 서버의 <code>OAuth2AuthorizedClientService</code>에만
-      보관됩니다.
-    </p>
-    <button id="login" type="button">Keycloak 로그인</button>
-    <button id="inspect" type="button">서버 token 경계 확인</button>
-    <pre id="result" aria-live="polite"></pre>
-  </main>
-  <script type="module" src="/app.js"></script>
-</body>
-</html>

token-mediator/src/test/java/com/example/keycloakpattern/mediator/TokenBoundaryControllerTest.java

@@ -1,50 +0,0 @@
-package com.example.keycloakpattern.mediator;
-
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.oidcLogin;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-
-import org.junit.jupiter.api.Test;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
-import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
-import org.springframework.security.oauth2.core.OAuth2AccessToken;
-import org.springframework.security.oauth2.core.OAuth2RefreshToken;
-import org.springframework.test.context.bean.override.mockito.MockitoBean;
-import org.springframework.test.web.servlet.MockMvc;
-
-@SpringBootTest(properties = "KEYCLOAK_CLIENT_SECRET=test-only-secret")
-@AutoConfigureMockMvc
-class TokenBoundaryControllerTest {
-
-    @Autowired
-    private MockMvc mockMvc;
-
-    @MockitoBean
-    private OAuth2AuthorizedClientService authorizedClientService;
-
-    @Test
-    void reportsServerSideTokensWithoutReturningTheirValues() throws Exception {
-        OAuth2AuthorizedClient client = mock(OAuth2AuthorizedClient.class);
-        when(client.getAccessToken()).thenReturn(mock(OAuth2AccessToken.class));
-        when(client.getRefreshToken()).thenReturn(mock(OAuth2RefreshToken.class));
-        when(authorizedClientService.loadAuthorizedClient("keycloak", "test-subject"))
-            .thenReturn(client);
-
-        mockMvc.perform(get("/token/boundary").with(oidcLogin()
-                .idToken(token -> token.subject("test-subject"))))
-            .andExpect(status().isOk())
-            .andExpect(header().string("Cache-Control", "no-store"))
-            .andExpect(jsonPath("$.accessTokenStored").value(true))
-            .andExpect(jsonPath("$.refreshTokenStored").value(true))
-            .andExpect(jsonPath("$.browserReceivesRefreshToken").value(false))
-            .andExpect(jsonPath("$.access_token").doesNotExist())
-            .andExpect(jsonPath("$.refresh_token").doesNotExist());
-    }
-}