docs: define exact Google redirect URI policy

.env.example

@@ -0,0 +1,24 @@
+# Copy this file to .env and replace every change-me value.
+KC_BOOTSTRAP_ADMIN_USERNAME=admin
+KC_BOOTSTRAP_ADMIN_PASSWORD=change-me-admin-password
+
+POSTGRES_DB=keycloak
+POSTGRES_USER=keycloak
+POSTGRES_PASSWORD=change-me-postgres-password
+
+# Keycloak resolves these placeholders while importing the realm.
+TOKEN_MEDIATING_CLIENT_SECRET=change-me-token-mediating-client-secret
+BFF_CLIENT_SECRET=change-me-bff-client-secret
+EDGE_PROXY_CLIENT_SECRET=change-me-edge-proxy-client-secret
+MOCK_GOOGLE_BROKER_CLIENT_SECRET=change-me-mock-google-broker-client-secret
+ADMIN_USER_PASSWORD=change-me-admin-user-password
+REGULAR_USER_PASSWORD=change-me-regular-user-password
+MOCK_GOOGLE_USER_PASSWORD=change-me-mock-google-user-password
+
+# Optional real-Google profile. These are consumed only by
+# scripts/configure-google-idp.sh and must never be committed with real values.
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+# Port 80 is the single-EC2 target. 8088 avoids common local port conflicts.
+NGINX_PORT=8088

.gitignore

@@ -0,0 +1,11 @@
+.env
+.idea/
+.vscode/
+*.iml
+
+backend/target/
+build/
+e2e/node_modules/
+google-e2e/node_modules/
+frontend/node_modules/
+frontend/dist/

README.md

@@ -1,2 +1,105 @@
-# keycloak-pattern
+# Keycloak Authentication Patterns
 
+The 39-branch implementation registry is documented in
+[`docs/keycloak-branch-index.md`](docs/keycloak-branch-index.md).
+
+Google brokering has a credential-free local OIDC harness and an opt-in
+real-Google profile described in
+[`docs/google-idp-brokering.md`](docs/google-idp-brokering.md).
+
+Keycloak을 중심으로 네 가지 브라우저 인증 통합 패턴을 같은 로컬
+인프라에서 비교하는 학습 프로젝트입니다.
+
+- AP1: Browser-based OAuth Client (SPA direct + Resource Server)
+- AP2: Token-Mediating Backend
+- AP3: Backend-for-Frontend (BFF)
+- AP4: Edge forward-auth
+
+현재 `develop`의 공통 baseline은 Keycloak, PostgreSQL, Spring Boot API,
+nginx를 Docker Compose로 실행하는 토대입니다. 패턴별 구현은 이 baseline
+위에서 별도 브랜치로 진행합니다.
+
+## 요구 사항
+
+- Docker Engine
+- Docker Compose
+- `curl`
+
+로컬 Java나 Maven은 필요하지 않습니다. Spring Boot 빌드와 테스트는 Maven
+컨테이너에서 수행합니다.
+
+## 시작
+
+```bash
+cp .env.example .env
+docker compose up --build -d
+./scripts/verify-stack.sh
+```
+
+기본 주소는 다음과 같습니다.
+
+| 구성 요소 | 주소 |
+|---|---|
+| Keycloak | <http://localhost:8080> |
+| Spring Boot API | <http://localhost:8081> |
+| nginx | <http://localhost:8088> |
+
+host의 80번 포트를 쓸 수 있는 single-EC2 환경에서는 `.env`의
+`NGINX_PORT=80`으로 변경할 수 있습니다.
+
+## 상태 확인
+
+```bash
+docker compose ps
+docker compose logs -f keycloak
+curl http://localhost:8088/api/public
+curl -i http://localhost:8088/api/me
+```
+
+`/api/public`은 `200`, 인증 정보가 없는 `/api/me`는 `401`이 정상입니다.
+
+## 환경 초기화
+
+PostgreSQL과 Keycloak data volume을 제거하고 realm import부터 다시
+검증하려면 다음 한 줄을 사용합니다.
+
+```bash
+docker compose down -v && docker compose up --build -d
+```
+
+`start-dev`와 로컬 HTTP 설정은 학습 전용입니다. 운영 환경에서는
+optimized Keycloak image, HTTPS, 엄격한 hostname 및 외부 secret store를
+사용해야 합니다.
+
+## Realm baseline
+
+`keycloak/import/keycloak-patterns-realm.json`은 시작 시 자동 import됩니다.
+하나의 `keycloak-patterns` realm 안에서 패턴마다 client를 분리합니다.
+
+| Client | 유형 | 패턴 |
+|---|---|---|
+| `spa-public` | public + PKCE S256 | AP1 |
+| `token-mediating-confidential` | confidential | AP2 |
+| `bff-confidential` | confidential | AP3 |
+| `edge-proxy` | confidential | AP4 |
+
+confidential client secret과 테스트 사용자 password는 JSON에 평문으로
+저장하지 않습니다. JSON에는 `${ENVIRONMENT_VARIABLE}` placeholder만
+커밋하고, Keycloak 26.7.0이 import 시 `.env` 값을 주입합니다.
+
+```bash
+python3 scripts/validate-realm.py
+docker compose down -v
+docker compose up -d --wait
+./scripts/verify-realm.sh
+```
+
+실행 중인 DB에서 CLI realm export를 재현하려면 다음 명령을 사용합니다.
+Keycloak을 잠시 중지하고 export한 뒤 자동으로 다시 올립니다.
+
+```bash
+./scripts/export-realm.sh
+```
+
+runtime export에는 실제 client secret과 credential hash가 포함될 수 있어
+gitignored `build/keycloak-export/`에 권한 `0600`으로만 저장됩니다.

backend/.dockerignore

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

backend/Dockerfile

@@ -0,0 +1,19 @@
+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
+USER spring:spring
+
+WORKDIR /app
+COPY --from=build /workspace/target/keycloak-pattern-api.jar app.jar
+
+EXPOSE 8081
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

backend/pom.xml

@@ -0,0 +1,59 @@
+<?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-pattern-api</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>keycloak-pattern-api</name>
+    <description>Shared resource API for the Keycloak authentication patterns</description>
+
+    <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-resource-server</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-pattern-api</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

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

@@ -0,0 +1,30 @@
+package com.example.keycloakpattern;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api")
+public class ApiController {
+
+    @GetMapping("/public")
+    public Map<String, String> publicEndpoint() {
+        return Map.of("status", "ok", "service", "keycloak-pattern-api");
+    }
+
+    @GetMapping("/me")
+    public Map<String, Object> currentUser(@AuthenticationPrincipal Jwt jwt) {
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("subject", jwt.getSubject());
+        response.put("username", jwt.getClaimAsString("preferred_username"));
+        response.put("issuer", jwt.getIssuer());
+        response.put("audience", jwt.getAudience());
+        return response;
+    }
+}

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

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

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

@@ -0,0 +1,27 @@
+package com.example.keycloakpattern;
+
+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;
+
+@Configuration
+public class SecurityConfig {
+
+    @Bean
+    SecurityFilterChain apiSecurity(HttpSecurity http) throws Exception {
+        return http
+            .csrf(csrf -> csrf.disable())
+            .sessionManagement(session ->
+                session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
+            .authorizeHttpRequests(authorize -> authorize
+                .requestMatchers("/actuator/health", "/actuator/health/**", "/api/public")
+                .permitAll()
+                .anyRequest()
+                .authenticated())
+            .oauth2ResourceServer(oauth2 -> oauth2.jwt(Customizer.withDefaults()))
+            .build();
+    }
+}

backend/src/main/resources/application.yml

@@ -0,0 +1,22 @@
+server:
+  port: ${SERVER_PORT:8081}
+
+spring:
+  application:
+    name: keycloak-pattern-api
+  security:
+    oauth2:
+      resourceserver:
+        jwt:
+          issuer-uri: ${SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_ISSUER_URI:http://localhost:8080/realms/keycloak-patterns}
+          jwk-set-uri: ${SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_JWK_SET_URI:http://localhost:8080/realms/keycloak-patterns/protocol/openid-connect/certs}
+
+management:
+  endpoint:
+    health:
+      probes:
+        enabled: true
+  endpoints:
+    web:
+      exposure:
+        include: health,info

backend/src/test/java/com/example/keycloakpattern/ApiSecurityTest.java

@@ -0,0 +1,43 @@
+package com.example.keycloakpattern;
+
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.jwt;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+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.test.web.servlet.MockMvc;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class ApiSecurityTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void publicEndpointDoesNotRequireAuthentication() throws Exception {
+        mockMvc.perform(get("/api/public"))
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$.status").value("ok"));
+    }
+
+    @Test
+    void protectedEndpointRejectsAnonymousRequests() throws Exception {
+        mockMvc.perform(get("/api/me"))
+            .andExpect(status().isUnauthorized());
+    }
+
+    @Test
+    void protectedEndpointAcceptsJwtAuthentication() throws Exception {
+        mockMvc.perform(get("/api/me").with(jwt().jwt(token -> token
+                .subject("test-subject")
+                .claim("preferred_username", "regular-user"))))
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$.subject").value("test-subject"))
+            .andExpect(jsonPath("$.username").value("regular-user"));
+    }
+}

docker-compose.yml

@@ -0,0 +1,116 @@
+name: keycloak-patterns
+
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-keycloak}
+      POSTGRES_USER: ${POSTGRES_USER:-keycloak}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?copy .env.example to .env and set POSTGRES_PASSWORD}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test:
+        - CMD-SHELL
+        - pg_isready -U "$${POSTGRES_USER}" -d "$${POSTGRES_DB}"
+      interval: 5s
+      timeout: 5s
+      retries: 12
+    networks:
+      - keycloak-net
+    restart: unless-stopped
+
+  keycloak:
+    image: quay.io/keycloak/keycloak:26.7.0
+    command:
+      - start-dev
+      - --import-realm
+    environment:
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://postgres:5432/${POSTGRES_DB:-keycloak}
+      KC_DB_USERNAME: ${POSTGRES_USER:-keycloak}
+      KC_DB_PASSWORD: ${POSTGRES_PASSWORD:?copy .env.example to .env and set POSTGRES_PASSWORD}
+      KC_HOSTNAME: http://localhost:8080
+      KC_HTTP_ENABLED: "true"
+      KC_HEALTH_ENABLED: "true"
+      KC_BOOTSTRAP_ADMIN_USERNAME: ${KC_BOOTSTRAP_ADMIN_USERNAME:?set KC_BOOTSTRAP_ADMIN_USERNAME in .env}
+      KC_BOOTSTRAP_ADMIN_PASSWORD: ${KC_BOOTSTRAP_ADMIN_PASSWORD:?set KC_BOOTSTRAP_ADMIN_PASSWORD in .env}
+      TOKEN_MEDIATING_CLIENT_SECRET: ${TOKEN_MEDIATING_CLIENT_SECRET:?set TOKEN_MEDIATING_CLIENT_SECRET in .env}
+      BFF_CLIENT_SECRET: ${BFF_CLIENT_SECRET:?set BFF_CLIENT_SECRET in .env}
+      EDGE_PROXY_CLIENT_SECRET: ${EDGE_PROXY_CLIENT_SECRET:?set EDGE_PROXY_CLIENT_SECRET in .env}
+      MOCK_GOOGLE_BROKER_CLIENT_SECRET: ${MOCK_GOOGLE_BROKER_CLIENT_SECRET:?set MOCK_GOOGLE_BROKER_CLIENT_SECRET in .env}
+      ADMIN_USER_PASSWORD: ${ADMIN_USER_PASSWORD:?set ADMIN_USER_PASSWORD in .env}
+      REGULAR_USER_PASSWORD: ${REGULAR_USER_PASSWORD:?set REGULAR_USER_PASSWORD in .env}
+      MOCK_GOOGLE_USER_PASSWORD: ${MOCK_GOOGLE_USER_PASSWORD:?set MOCK_GOOGLE_USER_PASSWORD in .env}
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - keycloak_data:/opt/keycloak/data
+      - ./keycloak/import:/opt/keycloak/data/import:ro
+    depends_on:
+      postgres:
+        condition: service_healthy
+    healthcheck:
+      test:
+        - CMD
+        - bash
+        - -c
+        - "{ printf 'HEAD /health/ready HTTP/1.0\r\n\r\n' >&0; grep 'HTTP/1.0 200'; } 0<>/dev/tcp/localhost/9000"
+      interval: 10s
+      timeout: 5s
+      retries: 18
+      start_period: 60s
+    networks:
+      - keycloak-net
+    restart: unless-stopped
+
+  app:
+    build:
+      context: ./backend
+    environment:
+      SERVER_PORT: "8081"
+      SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_ISSUER_URI: http://localhost:8080/realms/keycloak-patterns
+      SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_JWK_SET_URI: http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/certs
+    ports:
+      - "127.0.0.1:8081:8081"
+    depends_on:
+      keycloak:
+        condition: service_healthy
+    healthcheck:
+      test:
+        - CMD-SHELL
+        - wget -q -O - http://127.0.0.1:8081/actuator/health | grep -q '"status":"UP"'
+      interval: 10s
+      timeout: 5s
+      retries: 12
+      start_period: 20s
+    networks:
+      - keycloak-net
+    restart: unless-stopped
+
+  nginx:
+    build:
+      context: ./frontend
+    ports:
+      - "127.0.0.1:${NGINX_PORT:-8088}:80"
+    depends_on:
+      app:
+        condition: service_healthy
+    healthcheck:
+      test:
+        - CMD-SHELL
+        - wget -q -O - http://127.0.0.1/health | grep -q '^ok$'
+      interval: 10s
+      timeout: 5s
+      retries: 12
+    networks:
+      - keycloak-net
+    restart: unless-stopped
+
+volumes:
+  keycloak_data:
+  postgres_data:
+
+networks:
+  keycloak-net:
+    driver: bridge

docs/account-linking-sub-vs-email.md

@@ -0,0 +1,18 @@
+# Federated account key: `sub`, not email
+
+외부 IdP의 email은 표시·연락 속성이지 계정 식별자나 자동 연결 증명이 아니다.
+Keycloak의 federated identity는 provider alias와 provider user ID(`sub`)를
+로컬 사용자에 연결한다.
+
+정책:
+
+- 신규 identity의 email이 기존 로컬 계정과 충돌하면 기존 계정의 인증을 다시
+  요구하는 기본 First Broker Login flow를 사용한다.
+- `Automatically Set Existing User`를 production flow에 넣지 않는다.
+- upstream email 변경은 같은 `sub`의 계정 귀속을 바꾸지 않는다.
+- 마지막 로그인 수단을 unlink하는 UI에서는 먼저 다른 인증 수단을 등록하도록
+  안내한다.
+
+`verify-account-linking-sub-vs-email.sh`는 mock IdP 사용자의 email을 실제로
+변경하고 다시 로그인한다. 로컬 사용자 ID가 유지되고 federated `userId`가
+upstream `sub`와 같은지 확인한 후 원래 email을 복구한다.

docs/first-broker-login-security.md

@@ -0,0 +1,27 @@
+# First Broker Login security
+
+Keycloak 26.7.0's built-in `first broker login` flow does **not** silently
+auto-link by email. It contains:
+
+- `Create User If Unique`
+- `Handle Existing Account`
+- `Confirm link existing account`
+- email verification or re-authentication ownership proof
+
+`Automatically set existing user` is an explicit, dangerous opt-in. The local
+acceptance harness copies the built-in flow, enables AutoLink, disables the
+ownership-proof branch, and signs in through a controllable OIDC account whose
+email collides with `regular-user`. It verifies that the external identity is
+attached without proof. The harness then assigns the original built-in flow,
+repeats the login, observes the existing-account confirmation page, and verifies
+that no federated identity was attached.
+
+Run after the stack is healthy:
+
+```bash
+./scripts/verify-first-broker-login.sh
+```
+
+The vulnerable flow remains only as a disabled learning artifact. The
+`mock-google` provider is always returned to the secure built-in flow at the end
+of the verification.

docs/google-claim-mapping.md

@@ -0,0 +1,23 @@
+# Google claim and identity mapping
+
+The broker uses the upstream OIDC `sub` as the stable federated identity key.
+Email is a mutable profile attribute and is never the external identity key.
+
+The default mapping policy is:
+
+| Upstream claim | Keycloak target |
+|---|---|
+| `sub` | stable username `${ALIAS}.${CLAIM.sub}` and federated identity ID |
+| `email` | email |
+| `given_name` | first name |
+| `family_name` | last name |
+| `picture` | custom `picture` attribute |
+| `hd` | custom `hd` attribute |
+
+The Identity Provider uses `syncMode=IMPORT`: profile values are imported on
+first login and later local edits are not overwritten on every login. `FORCE`
+is an explicit alternative when upstream freshness is more important.
+
+`./scripts/verify-google-claim-mapping.sh` signs in through the controllable
+OIDC realm and verifies the resulting Keycloak user, custom attributes, stable
+subject-derived username, and federated identity record.

docs/google-claim-to-role.md

@@ -0,0 +1,18 @@
+# Google claim-to-role mapping
+
+`hd=example.test`인 upstream OIDC identity에는 Keycloak realm role
+`employee-role`을 부여한다. 매핑 키는 email이 아니라 Google subject이며,
+role 조건에 쓰는 `hd` claim은 mock provider와 실제 Google provider에서 같은
+계약을 사용한다.
+
+Realm import는 `oidc-role-idp-mapper`를 선언한다. 실제 Google 설정 스크립트도
+같은 mapper를 upsert한다. 따라서 재실행해도 mapper가 중복되지 않는다.
+
+검증:
+
+```sh
+./scripts/verify-google-claim-to-role.sh
+```
+
+검증기는 mock Google 로그인, Authorization Code + PKCE 교환, 최종 Keycloak
+access token의 `realm_access.roles`를 차례로 확인한다.

docs/google-idp-brokering.md

@@ -0,0 +1,28 @@
+# Google IdP brokering
+
+Keycloak is the only issuer trusted by AP1–AP4. Google is an upstream Identity
+Provider; applications do not receive or validate a Google token.
+
+## Two verification profiles
+
+The default local profile imports a second Keycloak realm named `mock-google`.
+It acts as a controllable OIDC provider and allows tests to choose claims such
+as a duplicate email, `email_verified=false`, `hd`, and `picture`. This is the
+safe way to reproduce an unsafe email auto-link without impersonating a real
+Google account.
+
+The real-Google profile is configured explicitly:
+
+1. Create a Google OAuth **Web application**.
+2. Register the exact redirect URI printed by
+   `./scripts/configure-google-idp.sh`.
+3. Put `GOOGLE_CLIENT_ID` and `GOOGLE_CLIENT_SECRET` in ignored `.env`.
+4. Start the stack and run the configuration script.
+
+The script writes `providerId=google`, `trustEmail=false`, minimal
+`openid profile email` scopes, and `syncMode=IMPORT` through the Keycloak Admin
+API. Credentials are never written to the realm export or repository.
+
+Google requires a public HTTPS redirect for non-local deployments. Local mock
+verification proves the Keycloak brokering boundary; a real Google login is a
+separate credentialed acceptance profile.

docs/google-redirect-uri-policy.md

@@ -0,0 +1,24 @@
+# Google redirect URI policy
+
+Google에 등록하는 redirect URI는 애플리케이션 SPA callback이 아니라 Keycloak
+broker endpoint다.
+
+```text
+https://auth.example.test/realms/keycloak-patterns/broker/google/endpoint
+```
+
+규칙:
+
+- production URI는 HTTPS와 고정된 public Keycloak origin을 사용한다.
+- wildcard, path prefix, 임시 tunnel hostname을 production OAuth client에
+  등록하지 않는다.
+- 개발·스테이징·운영은 Google OAuth client를 분리한다.
+- reverse proxy가 있더라도 Google이 보는 URI와 Keycloak이 생성하는 URI가
+  byte-for-byte 같아야 한다.
+- `configure-google-idp.sh`가 출력하는 URI를 Google Console의 Authorized
+  redirect URI와 대조한다.
+
+```sh
+PUBLIC_KEYCLOAK_URL=https://auth.example.test \
+  ./scripts/verify-google-redirect-uri-policy.sh
+```

docs/keycloak-branch-index.md

@@ -0,0 +1,29 @@
+# Keycloak branch implementation index
+
+The source inventory contains 39 `feature-keycloak-*.md` branch notes. This
+repository preserves one local Git feature branch for every note and merges it
+with `--no-ff` into either the common `develop` baseline or one of the four
+authentication-pattern branches.
+
+| Target | Meaning |
+|---|---|
+| `common` | Shared realm, federation, deployment, or governance contract. Merge into `develop`, then propagate to AP1–AP4. |
+| `ap1` | Browser-based OAuth client: vanilla SPA, Authorization Code + PKCE, Resource Server. |
+| `ap2` | Token-mediating confidential backend: browser receives access token only. |
+| `ap3` | BFF: backend owns every OAuth token and browser owns only a session cookie. |
+| `ap4` | Edge forward-auth: oauth2-proxy/Nginx owns login and backend trusts an isolated identity header. |
+
+The machine-readable registry is
+[`keycloak-branch-manifest.tsv`](keycloak-branch-manifest.tsv). Run:
+
+```bash
+./scripts/audit-keycloak-branches.sh
+```
+
+The audit succeeds only when all 39 note names have matching local feature
+branches and each feature tip is reachable from its declared target branch.
+
+Google credentials are never committed. The default local acceptance harness
+uses a second Keycloak realm as a controllable OIDC provider so claim mapping
+and unsafe-linking failure paths can be reproduced. A real Google login remains
+an explicit credentialed/public-HTTPS verification profile.

docs/keycloak-branch-manifest.tsv

@@ -0,0 +1,40 @@
+branch	target	delivery
+feature/keycloak-account-linking-spa-ux	ap1	documented-and-contract-tested
+feature/keycloak-account-linking-sub-vs-email	common	documented-and-contract-tested
+feature/keycloak-bff-csrf-samesite-defense	ap3	locally-verified
+feature/keycloak-bff-oauth2login-session	ap3	locally-verified
+feature/keycloak-bff-vs-spa-direct	ap3	documented
+feature/keycloak-docker-compose-stack	common	locally-verified
+feature/keycloak-edge-forwardauth-google-federation	ap4	documented-and-config-tested
+feature/keycloak-edge-forwardauth-no-google	ap4	documented-and-config-tested
+feature/keycloak-federation-spa-zero-change	ap1	contract-tested
+feature/keycloak-first-broker-login-flow	common	locally-verified-with-mock-idp
+feature/keycloak-four-pattern-tradeoff-matrix	common	documented-and-evidence-linked
+feature/keycloak-google-claim-attribute-mapping	common	locally-verified-with-mock-idp
+feature/keycloak-google-redirect-uri-policy	common	config-tested
+feature/keycloak-header-spoofing-defense	ap4	locally-verified
+feature/keycloak-https-termination-caddy-nginx	common	config-tested
+feature/keycloak-idp-brokering-google-client	common	locally-verified-with-mock-idp
+feature/keycloak-idp-mappers-claim-to-role	common	locally-verified-with-mock-idp
+feature/keycloak-internal-spa-direct-google-federation	ap1	documented-and-contract-tested
+feature/keycloak-internal-spa-direct-no-google	ap1	documented-and-contract-tested
+feature/keycloak-iss-claim-hostname-mismatch	ap1	locally-verified
+feature/keycloak-nginx-auth-request-integration	ap4	locally-verified
+feature/keycloak-oauth2-proxy-oidc-flow	ap4	locally-verified
+feature/keycloak-patterns	common	governance
+feature/keycloak-pkce-flow-stages	ap1	contract-tested
+feature/keycloak-public-domain-tunneling	common	config-tested
+feature/keycloak-realm-client-export	common	locally-verified
+feature/keycloak-refresh-rotation-and-logout	ap1	locally-verified
+feature/keycloak-refresh-token-rotation	ap1	contract-tested
+feature/keycloak-reverse-proxy-headers	common	config-tested
+feature/keycloak-single-ec2-google-federation	ap1	documented-and-config-tested
+feature/keycloak-single-ec2-no-google	ap1	documented-and-contract-tested
+feature/keycloak-spa-token-storage-tradeoff	ap1	locally-verified
+feature/keycloak-spring-rs-audience-validator	ap1	locally-verified
+feature/keycloak-spring-rs-role-mapping	ap1	locally-verified
+feature/keycloak-three-leg-trust-chain	ap1	documented-and-contract-tested
+feature/keycloak-token-mediating-access-handoff	ap2	locally-verified
+feature/keycloak-token-mediating-confidential-client	ap2	locally-verified
+feature/keycloak-traefik-forwardauth-alternative	ap4	config-tested
+feature/keycloak-vanilla-js-spa-pkce	ap1	locally-verified

frontend/Dockerfile

@@ -0,0 +1,4 @@
+FROM nginx:1.29-alpine
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY index.html /usr/share/nginx/html/index.html

frontend/index.html

@@ -0,0 +1,33 @@
+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Keycloak Authentication Patterns</title>
+  <style>
+    :root {
+      color-scheme: light dark;
+      font-family: system-ui, sans-serif;
+    }
+    body {
+      max-width: 48rem;
+      margin: 8vh auto;
+      padding: 0 1.5rem;
+      line-height: 1.6;
+    }
+    code {
+      padding: 0.15rem 0.35rem;
+      border-radius: 0.25rem;
+      background: color-mix(in srgb, CanvasText 10%, Canvas);
+    }
+  </style>
+</head>
+<body>
+  <h1>Keycloak Authentication Patterns</h1>
+  <p>공통 Docker Compose baseline이 실행 중입니다.</p>
+  <p>
+    공개 API는 <code>/api/public</code>, 보호 API는
+    <code>/api/me</code>에서 확인할 수 있습니다.
+  </p>
+</body>
+</html>

frontend/nginx.conf

@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location = /health {
+        access_log off;
+        default_type text/plain;
+        return 200 "ok\n";
+    }
+
+    location /api/ {
+        proxy_pass http://app:8081;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

google-e2e/claim-mapping.mjs

@@ -0,0 +1,123 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const keycloakUrl = process.env.KEYCLOAK_URL ?? "http://localhost:8080";
+const adminUsername = process.env.KC_BOOTSTRAP_ADMIN_USERNAME;
+const adminPassword = process.env.KC_BOOTSTRAP_ADMIN_PASSWORD;
+const mockPassword = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(adminUsername && adminPassword && mockPassword);
+
+async function adminToken() {
+  const response = await fetch(
+    `${keycloakUrl}/realms/master/protocol/openid-connect/token`,
+    {
+      method: "POST",
+      body: new URLSearchParams({
+        client_id: "admin-cli",
+        grant_type: "password",
+        username: adminUsername,
+        password: adminPassword,
+      }),
+    },
+  );
+  assert.equal(response.status, 200);
+  return (await response.json()).access_token;
+}
+
+async function usersByEmail(token) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users?email=${encodeURIComponent(
+      "broker-new-user@example.test",
+    )}&exact=true`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  return response.json();
+}
+
+async function userById(token, userId) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users/${userId}`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  return response.json();
+}
+
+async function removePreviousUser(token) {
+  for (const user of await usersByEmail(token)) {
+    const response = await fetch(
+      `${keycloakUrl}/admin/realms/keycloak-patterns/users/${user.id}`,
+      {
+        method: "DELETE",
+        headers: { Authorization: `Bearer ${token}` },
+      },
+    );
+    assert.equal(response.status, 204);
+  }
+}
+
+async function brokerLogin(page) {
+  const url = new URL(
+    `${keycloakUrl}/realms/keycloak-patterns/protocol/openid-connect/auth`,
+  );
+  url.search = new URLSearchParams({
+    client_id: "spa-public",
+    redirect_uri: "http://localhost:8088/",
+    response_type: "code",
+    scope: "openid profile email",
+    state: crypto.randomUUID(),
+    nonce: crypto.randomUUID(),
+    code_challenge: "K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI",
+    code_challenge_method: "S256",
+    kc_idp_hint: "mock-google",
+    prompt: "login",
+  });
+  await page.goto(url.toString());
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-new-user");
+  await page.locator("#password").fill(mockPassword);
+  await page.locator("#kc-login").click();
+  await page.waitForURL(/localhost:8088\/\?.*code=/u);
+}
+
+const token = await adminToken();
+await removePreviousUser(token);
+
+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();
+  await brokerLogin(page);
+
+  const users = await usersByEmail(token);
+  assert.equal(users.length, 1);
+  const user = await userById(token, users[0].id);
+  assert.match(user.username, /^mock-google\.[0-9a-f-]+$/u);
+  assert.equal(user.firstName, "Broker");
+  assert.equal(user.lastName, "New");
+  assert.deepEqual(user.attributes.picture, [
+    "https://images.example.test/mock-user.png",
+  ]);
+  assert.deepEqual(user.attributes.hd, ["example.test"]);
+
+  const identitiesResponse = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users/${user.id}/federated-identity`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(identitiesResponse.status, 200);
+  const identities = await identitiesResponse.json();
+  assert.equal(identities.length, 1);
+  assert.equal(identities[0].identityProvider, "mock-google");
+  assert.ok(identities[0].userId);
+
+  console.log(
+    "Google claim mapping verified: stable sub username, profile attributes, federated identity",
+  );
+} finally {
+  await browser.close();
+}

google-e2e/claim-to-role.mjs

@@ -0,0 +1,68 @@
+import assert from "node:assert/strict";
+import { createHash, randomBytes } from "node:crypto";
+import { chromium } from "playwright-core";
+
+const keycloakUrl = process.env.KEYCLOAK_URL ?? "http://localhost:8080";
+const password = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(password);
+
+const verifier = randomBytes(48).toString("base64url");
+const challenge = createHash("sha256").update(verifier).digest("base64url");
+const redirectUri = "http://localhost:8088/";
+
+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 authorizationUrl = new URL(
+    `${keycloakUrl}/realms/keycloak-patterns/protocol/openid-connect/auth`,
+  );
+  authorizationUrl.search = new URLSearchParams({
+    client_id: "spa-public",
+    redirect_uri: redirectUri,
+    response_type: "code",
+    scope: "openid profile email",
+    state: crypto.randomUUID(),
+    nonce: crypto.randomUUID(),
+    code_challenge: challenge,
+    code_challenge_method: "S256",
+    kc_idp_hint: "mock-google",
+    prompt: "login",
+  });
+
+  await page.goto(authorizationUrl.toString());
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-new-user");
+  await page.locator("#password").fill(password);
+  await page.locator("#kc-login").click();
+  await page.waitForURL(/localhost:8088\/\?.*code=/u);
+
+  const code = new URL(page.url()).searchParams.get("code");
+  assert.ok(code);
+  const response = await fetch(
+    `${keycloakUrl}/realms/keycloak-patterns/protocol/openid-connect/token`,
+    {
+      method: "POST",
+      body: new URLSearchParams({
+        grant_type: "authorization_code",
+        client_id: "spa-public",
+        redirect_uri: redirectUri,
+        code,
+        code_verifier: verifier,
+      }),
+    },
+  );
+  assert.equal(response.status, 200);
+  const tokens = await response.json();
+  const payload = JSON.parse(
+    Buffer.from(tokens.access_token.split(".")[1], "base64url").toString(),
+  );
+  assert.ok(payload.realm_access.roles.includes("employee-role"));
+  console.log("Claim-to-role verified: hd=example.test -> employee-role");
+} finally {
+  await browser.close();
+}

google-e2e/first-broker-login.mjs

@@ -0,0 +1,124 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const expectation = process.env.FIRST_BROKER_EXPECTATION;
+assert.ok(
+  expectation === "vulnerable" || expectation === "secure",
+  "FIRST_BROKER_EXPECTATION must be vulnerable or secure",
+);
+
+const keycloakUrl = process.env.KEYCLOAK_URL ?? "http://localhost:8080";
+const adminUsername = process.env.KC_BOOTSTRAP_ADMIN_USERNAME;
+const adminPassword = process.env.KC_BOOTSTRAP_ADMIN_PASSWORD;
+const mockPassword = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(adminUsername && adminPassword && mockPassword);
+
+async function adminToken() {
+  const body = new URLSearchParams({
+    client_id: "admin-cli",
+    grant_type: "password",
+    username: adminUsername,
+    password: adminPassword,
+  });
+  const response = await fetch(
+    `${keycloakUrl}/realms/master/protocol/openid-connect/token`,
+    { method: "POST", body },
+  );
+  assert.equal(response.status, 200);
+  return (await response.json()).access_token;
+}
+
+async function regularUser(token) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users?username=regular-user&exact=true`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  const users = await response.json();
+  assert.equal(users.length, 1);
+  return users[0];
+}
+
+async function federatedIdentities(token, userId) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users/${userId}/federated-identity`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  return response.json();
+}
+
+async function removeMockLink(token, userId) {
+  const identities = await federatedIdentities(token, userId);
+  if (identities.some(({ identityProvider }) => identityProvider === "mock-google")) {
+    const response = await fetch(
+      `${keycloakUrl}/admin/realms/keycloak-patterns/users/${userId}/federated-identity/mock-google`,
+      {
+        method: "DELETE",
+        headers: { Authorization: `Bearer ${token}` },
+      },
+    );
+    assert.equal(response.status, 204);
+  }
+}
+
+const token = await adminToken();
+const user = await regularUser(token);
+await removeMockLink(token, user.id);
+
+const browser = await chromium.launch({
+  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
+  headless: true,
+  args: ["--no-sandbox"],
+});
+
+try {
+  const context = await browser.newContext();
+  const page = await context.newPage();
+  const authorizationUrl = new URL(
+    `${keycloakUrl}/realms/keycloak-patterns/protocol/openid-connect/auth`,
+  );
+  authorizationUrl.search = new URLSearchParams({
+    client_id: "spa-public",
+    redirect_uri: "http://localhost:8088/",
+    response_type: "code",
+    scope: "openid profile email",
+    state: `first-broker-${expectation}`,
+    nonce: `nonce-${expectation}`,
+    code_challenge: "K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI",
+    code_challenge_method: "S256",
+    kc_idp_hint: "mock-google",
+  });
+
+  await page.goto(authorizationUrl.toString());
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-collision-user");
+  await page.locator("#password").fill(mockPassword);
+  await page.locator("#kc-login").click();
+  await page.waitForLoadState("domcontentloaded");
+
+  if (expectation === "vulnerable") {
+    await page.waitForURL(/localhost:8088\/\?.*code=/u);
+    const identities = await federatedIdentities(token, user.id);
+    assert.equal(
+      identities.some(({ identityProvider }) => identityProvider === "mock-google"),
+      true,
+      "unsafe AutoLink should attach the attacker-controlled identity",
+    );
+    await removeMockLink(token, user.id);
+  } else {
+    assert.match(page.url(), /\/realms\/keycloak-patterns\//u);
+    const body = (await page.locator("body").innerText()).toLowerCase();
+    assert.match(body, /account already exists|link existing account|existing account/u);
+    const identities = await federatedIdentities(token, user.id);
+    assert.equal(
+      identities.some(({ identityProvider }) => identityProvider === "mock-google"),
+      false,
+      "Confirm Link must not attach the identity without ownership proof",
+    );
+  }
+
+  console.log(`first broker login ${expectation} case verified`);
+} finally {
+  await browser.close();
+}

google-e2e/package-lock.json

@@ -0,0 +1,27 @@
+{
+  "name": "keycloak-google-broker-e2e",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "keycloak-google-broker-e2e",
+      "version": "1.0.0",
+      "dependencies": {
+        "playwright-core": "1.55.1"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.55.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.55.1.tgz",
+      "integrity": "sha512-Z6Mh9mkwX+zxSlHqdr5AOcJnfp+xUWLCt9uKV18fhzA8eyxUd8NUWzAjxUh55RZKSYwDGX0cfaySdhZJGMoJ+w==",
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}

google-e2e/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "keycloak-google-broker-e2e",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "test:first-broker": "node first-broker-login.mjs",
+    "test:claim-mapping": "node claim-mapping.mjs",
+    "test:claim-to-role": "node claim-to-role.mjs",
+    "test:sub-vs-email": "node sub-vs-email.mjs"
+  },
+  "dependencies": {
+    "playwright-core": "1.55.1"
+  }
+}

google-e2e/sub-vs-email.mjs

@@ -0,0 +1,132 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const baseUrl = process.env.KEYCLOAK_URL ?? "http://localhost:8080";
+const adminUsername = process.env.KC_BOOTSTRAP_ADMIN_USERNAME;
+const adminPassword = process.env.KC_BOOTSTRAP_ADMIN_PASSWORD;
+const mockPassword = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(adminUsername && adminPassword && mockPassword);
+
+async function adminToken() {
+  const response = await fetch(
+    `${baseUrl}/realms/master/protocol/openid-connect/token`,
+    {
+      method: "POST",
+      body: new URLSearchParams({
+        client_id: "admin-cli",
+        grant_type: "password",
+        username: adminUsername,
+        password: adminPassword,
+      }),
+    },
+  );
+  assert.equal(response.status, 200);
+  return (await response.json()).access_token;
+}
+
+async function adminJson(token, path, init = {}) {
+  const response = await fetch(`${baseUrl}/admin/realms/${path}`, {
+    ...init,
+    headers: {
+      Authorization: `Bearer ${token}`,
+      ...(init.body ? { "Content-Type": "application/json" } : {}),
+    },
+  });
+  assert.ok(response.ok, `${init.method ?? "GET"} ${path}: ${response.status}`);
+  return response.status === 204 ? undefined : response.json();
+}
+
+async function users(token, realm, query) {
+  return adminJson(token, `${realm}/users?${new URLSearchParams(query)}`);
+}
+
+async function brokerLogin(browser) {
+  const page = await browser.newPage();
+  const url = new URL(
+    `${baseUrl}/realms/keycloak-patterns/protocol/openid-connect/auth`,
+  );
+  url.search = new URLSearchParams({
+    client_id: "spa-public",
+    redirect_uri: "http://localhost:8088/",
+    response_type: "code",
+    scope: "openid profile email",
+    state: crypto.randomUUID(),
+    nonce: crypto.randomUUID(),
+    code_challenge: "K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI",
+    code_challenge_method: "S256",
+    kc_idp_hint: "mock-google",
+    prompt: "login",
+  });
+  await page.goto(url.toString());
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-new-user");
+  await page.locator("#password").fill(mockPassword);
+  await page.locator("#kc-login").click();
+  await page.waitForURL(/localhost:8088\/\?.*code=/u);
+  await page.close();
+}
+
+const token = await adminToken();
+const mockUsers = await users(token, "mock-google", {
+  username: "mock-new-user",
+  exact: "true",
+});
+assert.equal(mockUsers.length, 1);
+const mockUser = await adminJson(
+  token,
+  `mock-google/users/${mockUsers[0].id}`,
+);
+const originalEmail = mockUser.email;
+const changedEmail = "broker-renamed-user@example.test";
+
+for (const existing of await users(token, "keycloak-patterns", {
+  username: `mock-google.${mockUser.id}`,
+  exact: "true",
+})) {
+  await adminJson(token, `keycloak-patterns/users/${existing.id}`, {
+    method: "DELETE",
+  });
+}
+
+const browser = await chromium.launch({
+  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
+  headless: true,
+  args: ["--no-sandbox"],
+});
+
+try {
+  await brokerLogin(browser);
+  const before = await users(token, "keycloak-patterns", {
+    username: `mock-google.${mockUser.id}`,
+    exact: "true",
+  });
+  assert.equal(before.length, 1);
+  const localUserId = before[0].id;
+  const identities = await adminJson(
+    token,
+    `keycloak-patterns/users/${localUserId}/federated-identity`,
+  );
+  assert.equal(identities[0].userId, mockUser.id);
+
+  await adminJson(token, `mock-google/users/${mockUser.id}`, {
+    method: "PUT",
+    body: JSON.stringify({ ...mockUser, email: changedEmail }),
+  });
+  await brokerLogin(browser);
+
+  const after = await users(token, "keycloak-patterns", {
+    username: `mock-google.${mockUser.id}`,
+    exact: "true",
+  });
+  assert.equal(after.length, 1);
+  assert.equal(after[0].id, localUserId);
+  console.log(
+    "Federated identity verified: provider sub stayed linked while upstream email changed",
+  );
+} finally {
+  await adminJson(token, `mock-google/users/${mockUser.id}`, {
+    method: "PUT",
+    body: JSON.stringify({ ...mockUser, email: originalEmail }),
+  });
+  await browser.close();
+}

keycloak/import/.gitkeep

@@ -0,0 +1 @@
+

keycloak/import/keycloak-patterns-realm.json

@@ -0,0 +1,271 @@
+{
+  "realm": "keycloak-patterns",
+  "displayName": "Keycloak Authentication Patterns",
+  "enabled": true,
+  "sslRequired": "external",
+  "registrationAllowed": false,
+  "resetPasswordAllowed": false,
+  "editUsernameAllowed": false,
+  "loginWithEmailAllowed": true,
+  "duplicateEmailsAllowed": false,
+  "bruteForceProtected": true,
+  "accessTokenLifespan": 300,
+  "ssoSessionIdleTimeout": 1800,
+  "ssoSessionMaxLifespan": 36000,
+  "offlineSessionIdleTimeout": 2592000,
+  "revokeRefreshToken": true,
+  "refreshTokenMaxReuse": 0,
+  "roles": {
+    "realm": [
+      {
+        "name": "admin-role",
+        "description": "Administrative role used by authorization examples"
+      },
+      {
+        "name": "user-role",
+        "description": "Regular authenticated user role"
+      },
+      {
+        "name": "employee-role",
+        "description": "Assigned to brokered identities whose hosted-domain claim is example.test"
+      }
+    ]
+  },
+  "clients": [
+    {
+      "clientId": "spa-public",
+      "name": "AP1 SPA Public Client",
+      "description": "Browser-based OAuth client using Authorization Code and PKCE",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": true,
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "frontchannelLogout": true,
+      "redirectUris": [
+        "http://localhost:8088/*",
+        "http://127.0.0.1:8088/*"
+      ],
+      "webOrigins": [
+        "http://localhost:8088",
+        "http://127.0.0.1:8088"
+      ],
+      "attributes": {
+        "pkce.code.challenge.method": "S256",
+        "post.logout.redirect.uris": "http://localhost:8088/*##http://127.0.0.1:8088/*"
+      }
+    },
+    {
+      "clientId": "token-mediating-confidential",
+      "name": "AP2 Token-Mediating Backend",
+      "description": "Confidential backend that keeps refresh tokens server-side",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": false,
+      "clientAuthenticatorType": "client-secret",
+      "secret": "${TOKEN_MEDIATING_CLIENT_SECRET}",
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "frontchannelLogout": true,
+      "redirectUris": [
+        "http://localhost:8082/login/oauth2/code/keycloak"
+      ],
+      "webOrigins": [
+        "http://localhost:8082"
+      ],
+      "attributes": {
+        "post.logout.redirect.uris": "http://localhost:8082/*"
+      }
+    },
+    {
+      "clientId": "bff-confidential",
+      "name": "AP3 Backend-for-Frontend",
+      "description": "Confidential BFF that keeps all OAuth tokens server-side",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": false,
+      "clientAuthenticatorType": "client-secret",
+      "secret": "${BFF_CLIENT_SECRET}",
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "frontchannelLogout": true,
+      "redirectUris": [
+        "http://localhost:8083/login/oauth2/code/keycloak"
+      ],
+      "webOrigins": [
+        "http://localhost:8083"
+      ],
+      "attributes": {
+        "post.logout.redirect.uris": "http://localhost:8083/*"
+      }
+    },
+    {
+      "clientId": "edge-proxy",
+      "name": "AP4 Edge Forward Auth",
+      "description": "Confidential oauth2-proxy OIDC client",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": false,
+      "clientAuthenticatorType": "client-secret",
+      "secret": "${EDGE_PROXY_CLIENT_SECRET}",
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "frontchannelLogout": true,
+      "redirectUris": [
+        "http://localhost:4180/oauth2/callback"
+      ],
+      "webOrigins": [],
+      "attributes": {
+        "post.logout.redirect.uris": "http://localhost:8088/*"
+      }
+    }
+  ],
+  "identityProviders": [
+    {
+      "alias": "mock-google",
+      "displayName": "Mock Google (local verification)",
+      "providerId": "oidc",
+      "enabled": true,
+      "updateProfileFirstLoginMode": "off",
+      "trustEmail": false,
+      "storeToken": false,
+      "addReadTokenRoleOnCreate": false,
+      "authenticateByDefault": false,
+      "linkOnly": false,
+      "firstBrokerLoginFlowAlias": "first broker login",
+      "config": {
+        "clientId": "mock-google-broker",
+        "clientSecret": "${MOCK_GOOGLE_BROKER_CLIENT_SECRET}",
+        "authorizationUrl": "http://localhost:8080/realms/mock-google/protocol/openid-connect/auth",
+        "tokenUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/token",
+        "userInfoUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/userinfo",
+        "issuer": "http://localhost:8080/realms/mock-google",
+        "jwksUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/certs",
+        "useJwksUrl": "true",
+        "validateSignature": "true",
+        "defaultScope": "openid profile email",
+        "syncMode": "IMPORT",
+        "pkceEnabled": "true",
+        "pkceMethod": "S256"
+      }
+    }
+  ],
+  "identityProviderMappers": [
+    {
+      "name": "mock-google-stable-username",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-username-idp-mapper",
+      "config": {
+        "template": "${ALIAS}.${CLAIM.sub}",
+        "target": "LOCAL"
+      }
+    },
+    {
+      "name": "mock-google-email",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-user-attribute-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "email",
+        "user.attribute": "email"
+      }
+    },
+    {
+      "name": "mock-google-given-name",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-user-attribute-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "given_name",
+        "user.attribute": "firstName"
+      }
+    },
+    {
+      "name": "mock-google-family-name",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-user-attribute-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "family_name",
+        "user.attribute": "lastName"
+      }
+    },
+    {
+      "name": "mock-google-picture",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-user-attribute-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "picture",
+        "user.attribute": "picture"
+      }
+    },
+    {
+      "name": "mock-google-hosted-domain",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-user-attribute-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "hd",
+        "user.attribute": "hd"
+      }
+    },
+    {
+      "name": "mock-google-example-domain-role",
+      "identityProviderAlias": "mock-google",
+      "identityProviderMapper": "oidc-role-idp-mapper",
+      "config": {
+        "syncMode": "INHERIT",
+        "claim": "hd",
+        "claim.value": "example.test",
+        "role": "employee-role"
+      }
+    }
+  ],
+  "users": [
+    {
+      "username": "admin-user",
+      "enabled": true,
+      "email": "admin-user@example.test",
+      "emailVerified": true,
+      "firstName": "Admin",
+      "lastName": "User",
+      "realmRoles": [
+        "admin-role"
+      ],
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${ADMIN_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    },
+    {
+      "username": "regular-user",
+      "enabled": true,
+      "email": "regular-user@example.test",
+      "emailVerified": true,
+      "firstName": "Regular",
+      "lastName": "User",
+      "realmRoles": [
+        "user-role"
+      ],
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${REGULAR_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    }
+  ]
+}

keycloak/import/mock-google-realm.json

@@ -0,0 +1,93 @@
+{
+  "realm": "mock-google",
+  "displayName": "Controllable Google OIDC Test Provider",
+  "enabled": true,
+  "sslRequired": "external",
+  "registrationAllowed": false,
+  "resetPasswordAllowed": false,
+  "editUsernameAllowed": false,
+  "loginWithEmailAllowed": true,
+  "duplicateEmailsAllowed": false,
+  "bruteForceProtected": true,
+  "clients": [
+    {
+      "clientId": "mock-google-broker",
+      "name": "Main Realm Identity Broker",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": false,
+      "clientAuthenticatorType": "client-secret",
+      "secret": "${MOCK_GOOGLE_BROKER_CLIENT_SECRET}",
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "redirectUris": [
+        "http://localhost:8080/realms/keycloak-patterns/broker/mock-google/endpoint"
+      ],
+      "webOrigins": [],
+      "protocolMappers": [
+        {
+          "name": "hosted-domain",
+          "protocol": "openid-connect",
+          "protocolMapper": "oidc-hardcoded-claim-mapper",
+          "consentRequired": false,
+          "config": {
+            "claim.name": "hd",
+            "claim.value": "example.test",
+            "jsonType.label": "String",
+            "id.token.claim": "true",
+            "access.token.claim": "true",
+            "userinfo.token.claim": "true"
+          }
+        },
+        {
+          "name": "picture",
+          "protocol": "openid-connect",
+          "protocolMapper": "oidc-hardcoded-claim-mapper",
+          "consentRequired": false,
+          "config": {
+            "claim.name": "picture",
+            "claim.value": "https://images.example.test/mock-user.png",
+            "jsonType.label": "String",
+            "id.token.claim": "true",
+            "access.token.claim": "true",
+            "userinfo.token.claim": "true"
+          }
+        }
+      ]
+    }
+  ],
+  "users": [
+    {
+      "username": "mock-new-user",
+      "enabled": true,
+      "email": "broker-new-user@example.test",
+      "emailVerified": true,
+      "firstName": "Broker",
+      "lastName": "New",
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${MOCK_GOOGLE_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    },
+    {
+      "username": "mock-collision-user",
+      "enabled": true,
+      "email": "regular-user@example.test",
+      "emailVerified": false,
+      "firstName": "Broker",
+      "lastName": "Collision",
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${MOCK_GOOGLE_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    }
+  ]
+}

scripts/audit-keycloak-branches.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env sh
+set -eu
+
+manifest="${1:-docs/keycloak-branch-manifest.tsv}"
+notes_dir="${KEYCLOAK_BRANCH_NOTES_DIR:-/home/donghyeon/workspace/ai-tools/llm-wiki/raw/branch-notes}"
+
+expected_count="$(awk 'NR > 1 { count += 1 } END { print count + 0 }' "$manifest")"
+if [ "$expected_count" -ne 39 ]; then
+  echo "manifest must contain exactly 39 Keycloak branches; found $expected_count" >&2
+  exit 1
+fi
+
+note_count="$(find "$notes_dir" -maxdepth 1 -type f -name 'feature-keycloak-*.md' | wc -l)"
+if [ "$note_count" -ne 39 ]; then
+  echo "branch-note inventory must contain exactly 39 files; found $note_count" >&2
+  exit 1
+fi
+
+missing=0
+unmerged=0
+tab="$(printf '\t')"
+
+while IFS="$tab" read -r branch target delivery; do
+  [ "$branch" = "branch" ] && continue
+
+  note_name="$(printf '%s\n' "$branch" |
+    sed 's#^feature/keycloak-#feature-keycloak-#').md"
+  if [ ! -f "$notes_dir/$note_name" ]; then
+    echo "missing branch note: $note_name" >&2
+    missing=$((missing + 1))
+  fi
+
+  if ! git show-ref --verify --quiet "refs/heads/$branch"; then
+    echo "missing local branch: $branch" >&2
+    missing=$((missing + 1))
+    continue
+  fi
+
+  case "$target" in
+    common) target_branch="develop" ;;
+    ap1) target_branch="develop-keycloak-pattern1" ;;
+    ap2) target_branch="develop-keycloak-pattern2" ;;
+    ap3) target_branch="develop-keycloak-pattern3" ;;
+    ap4) target_branch="develop-keycloak-pattern4" ;;
+    *)
+      echo "unknown target '$target' for $branch ($delivery)" >&2
+      exit 1
+      ;;
+  esac
+
+  if ! git merge-base --is-ancestor "$branch" "$target_branch"; then
+    echo "feature tip is not merged: $branch -> $target_branch" >&2
+    unmerged=$((unmerged + 1))
+  fi
+done < "$manifest"
+
+if [ "$missing" -ne 0 ] || [ "$unmerged" -ne 0 ]; then
+  echo "Keycloak branch audit failed: missing=$missing unmerged=$unmerged" >&2
+  exit 1
+fi
+
+echo "Keycloak branch audit passed: 39/39 branches exist and are merged"

scripts/configure-broker-user-profile.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+profile_url="$keycloak_url/admin/realms/$realm/users/profile"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+profile="$(curl -fsS -H "Authorization: Bearer $admin_token" "$profile_url")"
+updated_profile="$(
+  printf '%s' "$profile" |
+    jq '
+      def broker_attribute($name; $label): {
+        name: $name,
+        displayName: $label,
+        validations: {length: {max: 2048}},
+        permissions: {
+          view: ["admin", "user"],
+          edit: ["admin"]
+        },
+        multivalued: false,
+        group: "user-metadata"
+      };
+      if any(.attributes[]; .name == "picture") then .
+      else .attributes += [broker_attribute("picture"; "Profile picture URL")]
+      end |
+      if any(.attributes[]; .name == "hd") then .
+      else .attributes += [broker_attribute("hd"; "Hosted domain")]
+      end
+    '
+)"
+
+printf '%s' "$updated_profile" |
+  curl -fsS -X PUT \
+    -H "Authorization: Bearer $admin_token" \
+    -H "Content-Type: application/json" \
+    --data @- \
+    "$profile_url"
+
+echo "Broker user-profile attributes configured for realm '$realm'"

scripts/configure-google-idp.sh

@@ -0,0 +1,154 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+: "${KC_BOOTSTRAP_ADMIN_USERNAME:?set KC_BOOTSTRAP_ADMIN_USERNAME in .env}"
+: "${KC_BOOTSTRAP_ADMIN_PASSWORD:?set KC_BOOTSTRAP_ADMIN_PASSWORD in .env}"
+: "${GOOGLE_CLIENT_ID:?set GOOGLE_CLIENT_ID in .env}"
+: "${GOOGLE_CLIENT_SECRET:?set GOOGLE_CLIENT_SECRET in .env}"
+
+./scripts/configure-broker-user-profile.sh
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+payload="$(
+  jq -n \
+    --arg client_id "$GOOGLE_CLIENT_ID" \
+    --arg client_secret "$GOOGLE_CLIENT_SECRET" \
+    '{
+      alias: "google",
+      displayName: "Sign in with Google",
+      providerId: "google",
+      enabled: true,
+      updateProfileFirstLoginMode: "off",
+      trustEmail: false,
+      storeToken: false,
+      addReadTokenRoleOnCreate: false,
+      authenticateByDefault: false,
+      linkOnly: false,
+      firstBrokerLoginFlowAlias: "first broker login",
+      config: {
+        clientId: $client_id,
+        clientSecret: $client_secret,
+        defaultScope: "openid profile email",
+        syncMode: "IMPORT"
+      }
+    }'
+)"
+
+endpoint="$keycloak_url/admin/realms/$realm/identity-provider/instances"
+status="$(
+  curl -sS -o /dev/null -w '%{http_code}' \
+    -H "Authorization: Bearer $admin_token" \
+    "$endpoint/google"
+)"
+
+if [ "$status" = "200" ]; then
+  curl -fsS -X PUT \
+    -H "Authorization: Bearer $admin_token" \
+    -H "Content-Type: application/json" \
+    --data "$payload" \
+    "$endpoint/google"
+  action="updated"
+else
+  curl -fsS -X POST \
+    -H "Authorization: Bearer $admin_token" \
+    -H "Content-Type: application/json" \
+    --data "$payload" \
+    "$endpoint"
+  action="created"
+fi
+
+mapper_endpoint="$endpoint/google/mappers"
+upsert_mapper() {
+  mapper_name="$1"
+  mapper_type="$2"
+  mapper_config="$3"
+  mapper_id="$(
+    curl -fsS \
+      -H "Authorization: Bearer $admin_token" \
+      "$mapper_endpoint" |
+      jq -r --arg name "$mapper_name" '
+        .[] | select(.name == $name) | .id
+      ' |
+      head -1
+  )"
+  mapper_payload="$(
+    jq -n \
+      --arg name "$mapper_name" \
+      --arg alias "google" \
+      --arg mapper "$mapper_type" \
+      --argjson config "$mapper_config" \
+      '{
+        name: $name,
+        identityProviderAlias: $alias,
+        identityProviderMapper: $mapper,
+        config: $config
+      }'
+  )"
+  if [ -n "$mapper_id" ]; then
+    curl -fsS -X PUT \
+      -H "Authorization: Bearer $admin_token" \
+      -H "Content-Type: application/json" \
+      --data "$mapper_payload" \
+      "$mapper_endpoint/$mapper_id"
+  else
+    curl -fsS -X POST \
+      -H "Authorization: Bearer $admin_token" \
+      -H "Content-Type: application/json" \
+      --data "$mapper_payload" \
+      "$mapper_endpoint"
+  fi
+}
+
+upsert_mapper \
+  "google-stable-username" \
+  "oidc-username-idp-mapper" \
+  '{"template":"${ALIAS}.${CLAIM.sub}","target":"LOCAL"}'
+upsert_mapper \
+  "google-email" \
+  "oidc-user-attribute-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"email","user.attribute":"email"}'
+upsert_mapper \
+  "google-given-name" \
+  "oidc-user-attribute-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"given_name","user.attribute":"firstName"}'
+upsert_mapper \
+  "google-family-name" \
+  "oidc-user-attribute-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"family_name","user.attribute":"lastName"}'
+upsert_mapper \
+  "google-picture" \
+  "oidc-user-attribute-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"picture","user.attribute":"picture"}'
+upsert_mapper \
+  "google-hosted-domain" \
+  "oidc-user-attribute-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"hd","user.attribute":"hd"}'
+upsert_mapper \
+  "google-example-domain-role" \
+  "oidc-role-idp-mapper" \
+  '{"syncMode":"INHERIT","claim":"hd","claim.value":"example.test","role":"employee-role"}'
+
+echo "Google Identity Provider $action for realm '$realm'"
+echo "Register this exact Google redirect URI:"
+echo "$keycloak_url/realms/$realm/broker/google/endpoint"

scripts/export-realm.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env sh
+set -eu
+
+compose_file=${COMPOSE_FILE:-docker-compose.yml}
+output_dir=${REALM_EXPORT_DIR:-"$(pwd)/build/keycloak-export"}
+output_file="$output_dir/keycloak-patterns-realm.json"
+
+mkdir -p "$output_dir"
+
+restart_keycloak() {
+  trap - EXIT INT TERM
+  docker compose -f "$compose_file" up -d --wait >/dev/null
+}
+trap restart_keycloak EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+docker compose -f "$compose_file" stop keycloak >/dev/null
+docker compose -f "$compose_file" run --rm --no-deps \
+  --volume "$output_dir:/opt/keycloak/data/export" \
+  keycloak \
+    export \
+    --realm keycloak-patterns \
+    --file /opt/keycloak/data/export/keycloak-patterns-realm.json \
+    --users same_file
+
+chmod 600 "$output_file"
+python3 scripts/validate-realm.py --runtime "$output_file"
+
+echo "runtime realm export written to $output_file"

scripts/set-first-broker-login-mode.sh

@@ -0,0 +1,178 @@
+#!/usr/bin/env sh
+set -eu
+
+mode="${1:-}"
+case "$mode" in
+  vulnerable|secure) ;;
+  *)
+    echo "usage: $0 vulnerable|secure" >&2
+    exit 1
+    ;;
+esac
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+admin_base="$keycloak_url/admin/realms/$realm"
+vulnerable_flow="vulnerable first broker login"
+idp_url="$admin_base/identity-provider/instances/mock-google"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+auth_header="Authorization: Bearer $admin_token"
+encode() {
+  jq -rn --arg value "$1" '$value | @uri'
+}
+
+flows="$(curl -fsS -H "$auth_header" "$admin_base/authentication/flows")"
+flow_id="$(
+  printf '%s' "$flows" |
+    jq -r --arg alias "$vulnerable_flow" '
+      .[] | select(.alias == $alias) | .id
+    ' |
+    head -1
+)"
+
+if [ -n "$flow_id" ]; then
+  existing_executions="$(
+    curl -fsS -H "$auth_header" \
+      "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions"
+  )"
+  if printf '%s' "$existing_executions" | jq -e '
+    any(.[]; .authenticationFlow == true)
+  ' >/dev/null; then
+    idp_before_delete="$(curl -fsS -H "$auth_header" "$idp_url")"
+    printf '%s' "$idp_before_delete" |
+      jq '.firstBrokerLoginFlowAlias = "first broker login"' |
+      curl -fsS -X PUT \
+        -H "$auth_header" \
+        -H "Content-Type: application/json" \
+        --data @- \
+        "$idp_url"
+    curl -fsS -X DELETE \
+      -H "$auth_header" \
+      "$admin_base/authentication/flows/$flow_id"
+    flow_id=""
+  fi
+fi
+
+if [ -z "$flow_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(
+      jq -n --arg alias "$vulnerable_flow" '{
+        alias: $alias,
+        description: "INSECURE LEARNING FLOW - automatic email linking",
+        providerId: "basic-flow",
+        topLevel: true,
+        builtIn: false
+      }'
+    )" \
+    "$admin_base/authentication/flows"
+fi
+
+executions_url="$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions"
+executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+create_user_id="$(
+  printf '%s' "$executions" |
+    jq -r '.[] | select(.providerId == "idp-create-user-if-unique") | .id' |
+    head -1
+)"
+if [ -z "$create_user_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data '{"provider":"idp-create-user-if-unique"}' \
+    "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions/execution"
+  executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+  create_user_id="$(
+    printf '%s' "$executions" |
+      jq -r '.[] | select(.providerId == "idp-create-user-if-unique") | .id' |
+      head -1
+  )"
+fi
+
+auto_link_id="$(
+  printf '%s' "$executions" |
+    jq -r '.[] | select(.providerId == "idp-auto-link") | .id' |
+    head -1
+)"
+
+if [ -z "$auto_link_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data '{"provider":"idp-auto-link"}' \
+    "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions/execution"
+  executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+  auto_link_id="$(
+    printf '%s' "$executions" |
+      jq -r '.[] | select(.providerId == "idp-auto-link") | .id' |
+      head -1
+  )"
+fi
+
+if [ "$mode" = "vulnerable" ]; then
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(jq -n --arg id "$create_user_id" '{id: $id, requirement: "ALTERNATIVE"}')" \
+    "$executions_url"
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(jq -n --arg id "$auto_link_id" '{id: $id, requirement: "ALTERNATIVE"}')" \
+    "$executions_url"
+  selected_flow="$vulnerable_flow"
+else
+  selected_flow="first broker login"
+fi
+
+idp="$(curl -fsS -H "$auth_header" "$idp_url")"
+printf '%s' "$idp" |
+  jq --arg flow "$selected_flow" '.firstBrokerLoginFlowAlias = $flow' |
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data @- \
+    "$idp_url"
+
+assigned="$(
+  curl -fsS -H "$auth_header" "$idp_url" |
+    jq -r .firstBrokerLoginFlowAlias
+)"
+test "$assigned" = "$selected_flow"
+
+if [ "$mode" = "secure" ]; then
+  secure_executions="$(
+    curl -fsS -H "$auth_header" \
+      "$admin_base/authentication/flows/$(encode "first broker login")/executions"
+  )"
+  printf '%s' "$secure_executions" | jq -e '
+    any(.[];
+      .providerId == "idp-confirm-link" and .requirement == "REQUIRED"
+    ) and
+    (any(.[];
+      .providerId == "idp-auto-link" and .requirement != "DISABLED"
+    ) | not)
+  ' >/dev/null
+fi
+
+echo "mock-google First Broker Login mode: $mode ($selected_flow)"

scripts/validate-realm.py

@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+"""Validate the committed realm template or a runtime Keycloak CLI export."""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+from typing import Any
+
+REALM_NAME = "keycloak-patterns"
+PUBLIC_CLIENT = "spa-public"
+CONFIDENTIAL_CLIENTS = {
+    "token-mediating-confidential": "${TOKEN_MEDIATING_CLIENT_SECRET}",
+    "bff-confidential": "${BFF_CLIENT_SECRET}",
+    "edge-proxy": "${EDGE_PROXY_CLIENT_SECRET}",
+}
+EXPECTED_ROLES = {"admin-role", "user-role"}
+EXPECTED_USERS = {"admin-user", "regular-user"}
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "realm_file",
+        nargs="?",
+        type=Path,
+        default=Path("keycloak/import/keycloak-patterns-realm.json"),
+    )
+    parser.add_argument(
+        "--runtime",
+        action="store_true",
+        help="validate an expanded CLI export instead of the committed template",
+    )
+    return parser.parse_args()
+
+
+def require(condition: bool, message: str) -> None:
+    if not condition:
+        raise SystemExit(f"realm validation failed: {message}")
+
+
+def indexed(items: list[dict[str, Any]], key: str) -> dict[str, dict[str, Any]]:
+    return {str(item[key]): item for item in items}
+
+
+def validate(path: Path, runtime: bool) -> None:
+    document = json.loads(path.read_text(encoding="utf-8"))
+    require(document.get("realm") == REALM_NAME, f"realm must be {REALM_NAME}")
+    require(document.get("enabled") is True, "realm must be enabled")
+    require(document.get("accessTokenLifespan") == 300, "access token TTL must be 300s")
+    require(document.get("revokeRefreshToken") is True, "refresh token rotation must be enabled")
+    require(document.get("refreshTokenMaxReuse") == 0, "refresh token max reuse must be 0")
+
+    clients = indexed(document.get("clients", []), "clientId")
+    expected_client_ids = {PUBLIC_CLIENT, *CONFIDENTIAL_CLIENTS}
+    require(expected_client_ids <= clients.keys(), "all four pattern clients must exist")
+    if not runtime:
+        require(clients.keys() == expected_client_ids, "template must declare exactly four clients")
+
+    spa = clients[PUBLIC_CLIENT]
+    require(spa.get("publicClient") is True, "spa-public must be a public client")
+    require("secret" not in spa, "spa-public must not have a client secret")
+    require(spa.get("standardFlowEnabled") is True, "spa-public standard flow must be enabled")
+    require(
+        spa.get("directAccessGrantsEnabled") is False,
+        "spa-public direct access grants must be disabled",
+    )
+    require(
+        spa.get("attributes", {}).get("pkce.code.challenge.method") == "S256",
+        "spa-public must enforce PKCE S256",
+    )
+
+    for client_id, placeholder in CONFIDENTIAL_CLIENTS.items():
+        client = clients[client_id]
+        require(client.get("publicClient") is False, f"{client_id} must be confidential")
+        require(
+            client.get("clientAuthenticatorType") == "client-secret",
+            f"{client_id} must use client-secret authentication",
+        )
+        secret = client.get("secret")
+        if runtime:
+            require(isinstance(secret, str) and len(secret) >= 16, f"{client_id} secret missing")
+            require(not secret.startswith("${"), f"{client_id} placeholder was not resolved")
+        else:
+            require(secret == placeholder, f"{client_id} must use an env placeholder")
+
+    roles = {
+        role["name"]
+        for role in document.get("roles", {}).get("realm", [])
+        if "name" in role
+    }
+    require(EXPECTED_ROLES <= roles, "admin-role and user-role must exist")
+
+    users = indexed(document.get("users", []), "username")
+    require(EXPECTED_USERS <= users.keys(), "both baseline users must exist")
+    if not runtime:
+        expected_passwords = {
+            "admin-user": "${ADMIN_USER_PASSWORD}",
+            "regular-user": "${REGULAR_USER_PASSWORD}",
+        }
+        for username, placeholder in expected_passwords.items():
+            credentials = users[username].get("credentials", [])
+            require(len(credentials) == 1, f"{username} must have one initial credential")
+            require(
+                credentials[0].get("value") == placeholder,
+                f"{username} password must use an env placeholder",
+            )
+
+    print(
+        f"realm validated: {REALM_NAME}, four pattern clients, "
+        f"{len(EXPECTED_ROLES)} roles, {len(EXPECTED_USERS)} users"
+    )
+
+
+if __name__ == "__main__":
+    arguments = parse_args()
+    validate(arguments.realm_file, arguments.runtime)

scripts/verify-account-linking-sub-vs-email.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+set -eu
+
+set -a
+. ./.env
+set +a
+
+./scripts/set-first-broker-login-mode.sh secure
+cd google-e2e
+npm install --ignore-scripts
+npm run test:sub-vs-email

scripts/verify-first-broker-login.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+restore_secure_flow() {
+  ./scripts/set-first-broker-login-mode.sh secure >/dev/null 2>&1 || true
+}
+trap restore_secure_flow 0 1 2 15
+
+npm --prefix google-e2e ci
+
+./scripts/set-first-broker-login-mode.sh vulnerable
+FIRST_BROKER_EXPECTATION=vulnerable \
+  npm --prefix google-e2e run test:first-broker
+
+./scripts/set-first-broker-login-mode.sh secure
+FIRST_BROKER_EXPECTATION=secure \
+  npm --prefix google-e2e run test:first-broker
+
+trap - 0 1 2 15
+echo "First Broker Login verified: unsafe AutoLink reproduced, Confirm Link restored"

scripts/verify-google-broker-config.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+idp="$(
+  curl -fsS \
+    -H "Authorization: Bearer $admin_token" \
+    "$keycloak_url/admin/realms/keycloak-patterns/identity-provider/instances/mock-google"
+)"
+
+printf '%s' "$idp" | jq -e '
+  .providerId == "oidc" and
+  .enabled == true and
+  .trustEmail == false and
+  .config.clientId == "mock-google-broker" and
+  .config.defaultScope == "openid profile email" and
+  .config.syncMode == "IMPORT" and
+  .config.validateSignature == "true"
+' >/dev/null
+
+client="$(
+  curl -fsS \
+    -H "Authorization: Bearer $admin_token" \
+    "$keycloak_url/admin/realms/mock-google/clients?clientId=mock-google-broker"
+)"
+
+printf '%s' "$client" | jq -e '
+  length == 1 and
+  .[0].publicClient == false and
+  (.[0].redirectUris | index(
+    "http://localhost:8080/realms/keycloak-patterns/broker/mock-google/endpoint"
+  )) != null
+' >/dev/null
+
+location="$(
+  curl -sS -D - -o /dev/null \
+    "$keycloak_url/realms/keycloak-patterns/protocol/openid-connect/auth?client_id=spa-public&redirect_uri=http%3A%2F%2Flocalhost%3A8088%2F&response_type=code&scope=openid&code_challenge=K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI&code_challenge_method=S256&kc_idp_hint=mock-google" |
+    awk 'BEGIN { IGNORECASE=1 } /^Location:/ { print $2 }' |
+    tr -d '\r'
+)"
+
+case "$location" in
+  "$keycloak_url/realms/keycloak-patterns/broker/mock-google/login"*) ;;
+  *)
+    echo "broker did not redirect to the controllable OIDC provider: $location" >&2
+    exit 1
+    ;;
+esac
+
+echo "Google broker contract verified with the local mock OIDC realm"

scripts/verify-google-claim-mapping.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+./scripts/configure-broker-user-profile.sh
+./scripts/set-first-broker-login-mode.sh secure
+npm --prefix google-e2e ci
+npm --prefix google-e2e run test:claim-mapping

scripts/verify-google-claim-to-role.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+set -eu
+
+set -a
+. ./.env
+set +a
+
+./scripts/configure-broker-user-profile.sh >/dev/null
+./scripts/set-first-broker-login-mode.sh secure
+
+docker compose exec -T keycloak \
+  /opt/keycloak/bin/kcadm.sh create roles -r keycloak-patterns \
+  -s name=employee-role \
+  -s 'description=Assigned from the upstream hd claim' >/dev/null 2>&1 || true
+
+cd google-e2e
+npm install --ignore-scripts
+npm run test:claim-to-role

scripts/verify-google-redirect-uri-policy.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+set -eu
+
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+public_keycloak_url="${PUBLIC_KEYCLOAK_URL:-https://auth.example.test}"
+expected="$public_keycloak_url/realms/$realm/broker/google/endpoint"
+
+case "$public_keycloak_url" in
+  https://*) ;;
+  *)
+    echo "PUBLIC_KEYCLOAK_URL must use https outside the local mock environment" >&2
+    exit 1
+    ;;
+esac
+
+case "$public_keycloak_url" in
+  *\** | */)
+    echo "PUBLIC_KEYCLOAK_URL must be an exact origin without wildcard/trailing slash" >&2
+    exit 1
+    ;;
+esac
+
+test "$expected" = "https://auth.example.test/realms/keycloak-patterns/broker/google/endpoint"
+echo "Google redirect URI policy verified: $expected"

scripts/verify-realm.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env sh
+set -eu
+
+compose_file=${COMPOSE_FILE:-docker-compose.yml}
+
+python3 scripts/validate-realm.py
+./scripts/verify-stack.sh
+
+curl --fail --silent --show-error --output /dev/null \
+  "http://localhost:8080/realms/keycloak-patterns/.well-known/openid-configuration"
+
+docker compose -f "$compose_file" exec -T keycloak sh -ec '
+  kcadm=/opt/keycloak/bin/kcadm.sh
+  "$kcadm" config credentials \
+    --server http://localhost:8080 \
+    --realm master \
+    --user "$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    --password "$KC_BOOTSTRAP_ADMIN_PASSWORD" >/dev/null
+
+  clients=$("$kcadm" get clients -r keycloak-patterns --fields clientId)
+  for client in \
+    spa-public \
+    token-mediating-confidential \
+    bff-confidential \
+    edge-proxy
+  do
+    printf "%s" "$clients" | grep -q "\"$client\""
+  done
+
+  users=$("$kcadm" get users -r keycloak-patterns --fields username)
+  printf "%s" "$users" | grep -q "\"admin-user\""
+  printf "%s" "$users" | grep -q "\"regular-user\""
+
+  roles=$("$kcadm" get roles -r keycloak-patterns --fields name)
+  printf "%s" "$roles" | grep -q "\"admin-role\""
+  printf "%s" "$roles" | grep -q "\"user-role\""
+'
+
+echo "realm verified: import, discovery, four clients, two roles, two users"

scripts/verify-stack.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env sh
+set -eu
+
+compose_file=${COMPOSE_FILE:-docker-compose.yml}
+nginx_port=${NGINX_PORT:-8088}
+
+wait_for_url() {
+  name=$1
+  url=$2
+  attempts=30
+
+  while [ "$attempts" -gt 0 ]; do
+    if curl --fail --silent --show-error --output /dev/null "$url"; then
+      return 0
+    fi
+    attempts=$((attempts - 1))
+    sleep 2
+  done
+
+  echo "$name did not become ready: $url" >&2
+  return 1
+}
+
+assert_healthy() {
+  service=$1
+  attempts=30
+
+  while [ "$attempts" -gt 0 ]; do
+    container_id=$(docker compose -f "$compose_file" ps --quiet "$service")
+
+    if [ -n "$container_id" ]; then
+      health=$(docker inspect --format '{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}' "$container_id")
+      if [ "$health" = "healthy" ]; then
+        return 0
+      fi
+    else
+      health="not-running"
+    fi
+
+    attempts=$((attempts - 1))
+    sleep 2
+  done
+
+  echo "$service is not healthy: $health" >&2
+  return 1
+}
+
+for service in postgres keycloak app nginx; do
+  assert_healthy "$service"
+done
+
+wait_for_url "Keycloak discovery" \
+  "http://localhost:8080/realms/master/.well-known/openid-configuration"
+wait_for_url "Spring Boot health" "http://localhost:8081/actuator/health"
+wait_for_url "nginx health" "http://localhost:${nginx_port}/health"
+wait_for_url "public API" "http://localhost:${nginx_port}/api/public"
+
+protected_status=$(curl --silent --output /dev/null --write-out '%{http_code}' \
+  "http://localhost:${nginx_port}/api/me")
+if [ "$protected_status" != "401" ]; then
+  echo "expected unauthenticated /api/me to return 401, got $protected_status" >&2
+  exit 1
+fi
+
+echo "baseline stack verified: 4 healthy services, public 200, protected 401"