test(ap1): reproduce issuer mismatch

.env.example

@@ -10,8 +10,6 @@ POSTGRES_PASSWORD=change-me-postgres-password
 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
-OAUTH2_PROXY_COOKIE_SECRET=generate-a-base64-encoded-32-byte-secret
-INTERNAL_AUTH_TOKEN=generate-a-long-random-edge-to-backend-token
 ADMIN_USER_PASSWORD=change-me-admin-user-password
 REGULAR_USER_PASSWORD=change-me-regular-user-password
 

README.md

@@ -97,21 +97,28 @@ 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.
 
-## AP4: oauth2-proxy Edge Forward Auth
+## AP1: SPA Direct + Resource Server
 
-`develop-keycloak-pattern4`는 oauth2-proxy와 Nginx `auth_request`가
-인증을 edge에서 강제하는 패턴입니다.
+`develop-keycloak-pattern1`은 vanilla JavaScript SPA가 `spa-public` client로
+Authorization Code + PKCE S256 로그인을 수행하는 패턴입니다. access/refresh
+token은 명시적인 in-memory store에만 보관되므로 새로고침하면 사라집니다.
 
 ```bash
-./scripts/verify-pattern4.sh
+./scripts/verify-pattern1.sh
 ```
 
-첫 feature에서는 oauth2-proxy를 `http://localhost:4180`에 직접 노출해
-OIDC redirect/PKCE/callback과 forwarded-user를 분리 확인합니다. 두 번째
-feature부터 `http://localhost:8088` Nginx가 단일 진입점이며, 내부
-`auth_request`는 브라우저 요청을 login 302로, API 요청을 JSON 401로
-구분합니다. 최종 feature에서는 backend와 oauth2-proxy의 호스트 노출을
-제거하고 Nginx 헤더 덮어쓰기와 내부 토큰 검증으로 spoofing을 막습니다.
-자세한 내용은
-[`docs/ap4-edge-forward-auth.md`](docs/ap4-edge-forward-auth.md)를
-참고하세요.
+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.
+
+Keycloak의 dedicated audience mapper는 `spa-public` access token에
+`keycloak-pattern-api`를 추가합니다. Spring은 signature, `iss`, `exp`뿐
+아니라 이 `aud`도 검사합니다. `verify-pattern1.sh`는 같은 정상 토큰을
+`deliberately-wrong-audience`를 기대하는 진단 인스턴스에도 제출해 `401`을
+확인합니다.
+
+Keycloak은 `KC_HOSTNAME=http://localhost:8080`을 기준으로 token의 `iss`를
+발급합니다. 정상 Resource Server는 이 외부 issuer 문자열을 검증하되 JWKS는
+Docker 내부의 `http://keycloak:8080`에서 가져옵니다. 진단 인스턴스는 일부러
+`http://wrong-issuer.invalid`를 기대하도록 구성되어, 서명과 audience가
+정상이더라도 issuer mismatch로 `401`을 반환합니다.

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

@@ -0,0 +1,29 @@
+package com.example.keycloakpattern;
+
+import org.springframework.security.oauth2.core.OAuth2Error;
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+import org.springframework.security.oauth2.jwt.Jwt;
+
+final class AudienceValidator implements OAuth2TokenValidator<Jwt> {
+
+    private static final OAuth2Error MISSING_AUDIENCE = new OAuth2Error(
+        "invalid_token",
+        "The required resource audience is missing",
+        null
+    );
+
+    private final String expectedAudience;
+
+    AudienceValidator(String expectedAudience) {
+        this.expectedAudience = expectedAudience;
+    }
+
+    @Override
+    public OAuth2TokenValidatorResult validate(Jwt jwt) {
+        if (jwt.getAudience().contains(expectedAudience)) {
+            return OAuth2TokenValidatorResult.success();
+        }
+        return OAuth2TokenValidatorResult.failure(MISSING_AUDIENCE);
+    }
+}

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

@@ -1,59 +0,0 @@
-package com.example.keycloakpattern;
-
-import java.nio.charset.StandardCharsets;
-import java.security.MessageDigest;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-import jakarta.servlet.http.HttpServletRequest;
-
-import org.springframework.http.ResponseEntity;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class EdgeIdentityController {
-
-    private final byte[] internalAuthToken;
-
-    EdgeIdentityController(@Value("${edge.internal-auth-token}") String internalAuthToken) {
-        if (!hasText(internalAuthToken)) {
-            throw new IllegalStateException("edge.internal-auth-token must be configured");
-        }
-        this.internalAuthToken = internalAuthToken.getBytes(StandardCharsets.UTF_8);
-    }
-
-    @GetMapping("/edge/me")
-    ResponseEntity<Map<String, Object>> currentUser(HttpServletRequest request) {
-        String authRequestUser = request.getHeader("X-Auth-Request-User");
-        if (!hasText(authRequestUser) || !hasValidInternalToken(request)) {
-            return ResponseEntity.status(401).body(Map.of(
-                "error",
-                "trusted edge authentication is required"
-            ));
-        }
-
-        Map<String, Object> response = new LinkedHashMap<>();
-        response.put("pattern", "AP4-edge-forward-auth");
-        response.put("user", authRequestUser);
-        response.put("email", request.getHeader("X-Auth-Request-Email"));
-        response.put("identityHeader", "X-Auth-Request-User");
-        return ResponseEntity.ok(response);
-    }
-
-    private boolean hasValidInternalToken(HttpServletRequest request) {
-        String suppliedToken = request.getHeader("X-Internal-Auth-Token");
-        if (!hasText(suppliedToken)) {
-            return false;
-        }
-        return MessageDigest.isEqual(
-            internalAuthToken,
-            suppliedToken.getBytes(StandardCharsets.UTF_8)
-        );
-    }
-
-    private static boolean hasText(String value) {
-        return value != null && !value.isBlank();
-    }
-}

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

@@ -0,0 +1,31 @@
+package com.example.keycloakpattern;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.oauth2.core.DelegatingOAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtDecoder;
+import org.springframework.security.oauth2.jwt.JwtValidators;
+import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
+
+@Configuration
+public class JwtDecoderConfig {
+
+    @Bean
+    JwtDecoder jwtDecoder(
+        @Value("${spring.security.oauth2.resourceserver.jwt.issuer-uri}") String issuer,
+        @Value("${spring.security.oauth2.resourceserver.jwt.jwk-set-uri}") String jwkSetUri,
+        @Value("${security.expected-audience}") String expectedAudience
+    ) {
+        NimbusJwtDecoder decoder = NimbusJwtDecoder.withJwkSetUri(jwkSetUri).build();
+        OAuth2TokenValidator<Jwt> issuerAndTimestamp =
+            JwtValidators.createDefaultWithIssuer(issuer);
+        OAuth2TokenValidator<Jwt> audience = new AudienceValidator(expectedAudience);
+        decoder.setJwtValidator(
+            new DelegatingOAuth2TokenValidator<>(issuerAndTimestamp, audience)
+        );
+        return decoder;
+    }
+}

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 {
@@ -13,20 +18,31 @@ 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))
             .authorizeHttpRequests(authorize -> authorize
-                .requestMatchers(
-                    "/actuator/health",
-                    "/actuator/health/**",
-                    "/api/public",
-                    "/edge/**"
-                )
+                .requestMatchers("/actuator/health", "/actuator/health/**", "/api/public")
                 .permitAll()
                 .anyRequest()
                 .authenticated())
             .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;
+    }
 }

backend/src/main/resources/application.yml

@@ -1,9 +1,6 @@
 server:
   port: ${SERVER_PORT:8081}
 
-edge:
-  internal-auth-token: ${EDGE_INTERNAL_AUTH_TOKEN:}
-
 spring:
   application:
     name: keycloak-pattern-api
@@ -14,6 +11,9 @@ spring:
           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}
 
+security:
+  expected-audience: ${SECURITY_EXPECTED_AUDIENCE:keycloak-pattern-api}
+
 management:
   endpoint:
     health:

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

@@ -11,7 +11,7 @@ import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMock
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.web.servlet.MockMvc;
 
-@SpringBootTest(properties = "edge.internal-auth-token=test-internal-edge-token")
+@SpringBootTest
 @AutoConfigureMockMvc
 class ApiSecurityTest {
 
@@ -40,36 +40,4 @@ class ApiSecurityTest {
             .andExpect(jsonPath("$.subject").value("test-subject"))
             .andExpect(jsonPath("$.username").value("regular-user"));
     }
-
-    @Test
-    void edgeEndpointRejectsMissingTrustedHeaders() throws Exception {
-        mockMvc.perform(get("/edge/me"))
-            .andExpect(status().isUnauthorized());
-    }
-
-    @Test
-    void edgeEndpointRejectsForgedIdentityWithoutInternalToken() throws Exception {
-        mockMvc.perform(get("/edge/me")
-                .header("X-Auth-Request-User", "spoofed-admin"))
-            .andExpect(status().isUnauthorized());
-    }
-
-    @Test
-    void edgeEndpointRejectsWrongInternalToken() throws Exception {
-        mockMvc.perform(get("/edge/me")
-                .header("X-Auth-Request-User", "spoofed-admin")
-                .header("X-Internal-Auth-Token", "wrong-token"))
-            .andExpect(status().isUnauthorized());
-    }
-
-    @Test
-    void edgeEndpointAcceptsIdentityFromTrustedEdge() throws Exception {
-        mockMvc.perform(get("/edge/me")
-                .header("X-Auth-Request-User", "regular-user")
-                .header("X-Auth-Request-Email", "regular-user@example.test")
-                .header("X-Internal-Auth-Token", "test-internal-edge-token"))
-            .andExpect(status().isOk())
-            .andExpect(jsonPath("$.user").value("regular-user"))
-            .andExpect(jsonPath("$.identityHeader").value("X-Auth-Request-User"));
-    }
 }

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

@@ -0,0 +1,49 @@
+package com.example.keycloakpattern;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+import org.springframework.security.oauth2.jwt.Jwt;
+
+class AudienceValidatorTest {
+
+    private final AudienceValidator validator =
+        new AudienceValidator("keycloak-pattern-api");
+
+    @Test
+    void acceptsRequiredAudience() {
+        OAuth2TokenValidatorResult result = validator.validate(jwtWithAudience(
+            List.of("account", "keycloak-pattern-api")
+        ));
+
+        assertThat(result.hasErrors()).isFalse();
+    }
+
+    @Test
+    void rejectsForeignAudience() {
+        OAuth2TokenValidatorResult result = validator.validate(jwtWithAudience(
+            List.of("another-resource")
+        ));
+
+        assertThat(result.hasErrors()).isTrue();
+        assertThat(result.getErrors())
+            .extracting(error -> error.getErrorCode())
+            .containsExactly("invalid_token");
+    }
+
+    private Jwt jwtWithAudience(List<String> audience) {
+        Instant now = Instant.now();
+        return new Jwt(
+            "test-token",
+            now,
+            now.plusSeconds(300),
+            Map.of("alg", "none"),
+            Map.of("sub", "test-subject", "aud", audience)
+        );
+    }
+}

docker-compose.yml

@@ -69,9 +69,8 @@ services:
       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
-      EDGE_INTERNAL_AUTH_TOKEN: ${INTERNAL_AUTH_TOKEN:?set INTERNAL_AUTH_TOKEN in .env}
-    expose:
-      - "8081"
+    ports:
+      - "127.0.0.1:8081:8081"
     depends_on:
       keycloak:
         condition: service_healthy
@@ -87,67 +86,65 @@ services:
       - keycloak-net
     restart: unless-stopped
 
-  oauth2-proxy:
-    image: quay.io/oauth2-proxy/oauth2-proxy:v7.15.2
-    command:
-      - --http-address=0.0.0.0:4180
-      - --provider=keycloak-oidc
-      - --oidc-issuer-url=http://localhost:8080/realms/keycloak-patterns
-      - --skip-oidc-discovery=true
-      - --login-url=http://localhost:8080/realms/keycloak-patterns/protocol/openid-connect/auth
-      - --redeem-url=http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/token
-      - --oidc-jwks-url=http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/certs
-      - --profile-url=http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/userinfo
-      - --validate-url=http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/userinfo
-      - --redirect-url=http://localhost:8088/oauth2/callback
-      - --upstream=http://app:8081
-      - --email-domain=*
-      - --scope=openid profile email
-      - --code-challenge-method=S256
-      - --reverse-proxy=true
-      - --trusted-proxy-ip=172.30.40.10/32
-      - --cookie-name=AP4_SESSION
-      - --cookie-secure=false
-      - --cookie-samesite=lax
-      - --cookie-expire=1h
-      - --skip-provider-button=true
-      - --set-xauthrequest=true
-      - --pass-user-headers=true
-      - --whitelist-domain=localhost:8088
-      - --whitelist-domain=localhost:8080
+  app-wrong-audience:
+    profiles:
+      - diagnostics
+    build:
+      context: ./backend
     environment:
-      OAUTH2_PROXY_CLIENT_ID: edge-proxy
-      OAUTH2_PROXY_CLIENT_SECRET: ${EDGE_PROXY_CLIENT_SECRET:?set EDGE_PROXY_CLIENT_SECRET in .env}
-      OAUTH2_PROXY_COOKIE_SECRET: ${OAUTH2_PROXY_COOKIE_SECRET:?set OAUTH2_PROXY_COOKIE_SECRET in .env}
-    expose:
-      - "4180"
+      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
+      SECURITY_EXPECTED_AUDIENCE: deliberately-wrong-audience
+    ports:
+      - "127.0.0.1:18081:8081"
     depends_on:
       keycloak:
         condition: service_healthy
-      app:
+    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
+
+  app-wrong-issuer:
+    profiles:
+      - diagnostics
+    build:
+      context: ./backend
+    environment:
+      SERVER_PORT: "8081"
+      SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_ISSUER_URI: http://wrong-issuer.invalid/realms/keycloak-patterns
+      SPRING_SECURITY_OAUTH2_RESOURCESERVER_JWT_JWK_SET_URI: http://keycloak:8080/realms/keycloak-patterns/protocol/openid-connect/certs
+      SECURITY_EXPECTED_AUDIENCE: keycloak-pattern-api
+    ports:
+      - "127.0.0.1:18082:8081"
+    depends_on:
+      keycloak:
         condition: service_healthy
     healthcheck:
       test:
-        - CMD
-        - /bin/oauth2-proxy
-        - --version
+        - CMD-SHELL
+        - wget -q -O - http://127.0.0.1:8081/actuator/health | grep -q '"status":"UP"'
       interval: 10s
       timeout: 5s
-      retries: 3
-      start_period: 5s
+      retries: 12
+      start_period: 20s
     networks:
       - keycloak-net
-    restart: unless-stopped
 
   nginx:
     build:
       context: ./frontend
-    environment:
-      INTERNAL_AUTH_TOKEN: ${INTERNAL_AUTH_TOKEN:?set INTERNAL_AUTH_TOKEN in .env}
     ports:
       - "127.0.0.1:${NGINX_PORT:-8088}:80"
     depends_on:
-      oauth2-proxy:
+      app:
         condition: service_healthy
     healthcheck:
       test:
@@ -157,8 +154,7 @@ services:
       timeout: 5s
       retries: 12
     networks:
-      keycloak-net:
-        ipv4_address: 172.30.40.10
+      - keycloak-net
     restart: unless-stopped
 
 volumes:
@@ -168,6 +164,3 @@ volumes:
 networks:
   keycloak-net:
     driver: bridge
-    ipam:
-      config:
-        - subnet: 172.30.40.0/24

docs/ap4-edge-forward-auth.md

@@ -1,70 +0,0 @@
-# AP4 · oauth2-proxy Edge Forward Auth
-
-## 첫 단계: oauth2-proxy 자체 OIDC 흐름
-
-`feature/keycloak-oauth2-proxy-oidc-flow`에서는 oauth2-proxy를
-`http://localhost:4180`에 직접 노출해 구성 요소를 분리해서 확인합니다.
-
-1. `/edge/me` 미인증 요청이 Keycloak로 redirect됩니다.
-2. oauth2-proxy는 confidential `edge-proxy` client와 PKCE S256을 사용합니다.
-3. callback에서 code/token 교환과 ID/access token 검증은 서버끼리
-   수행합니다.
-4. 브라우저에는 HttpOnly `AP4_SESSION` cookie만 남습니다.
-5. oauth2-proxy가 backend 요청에 `X-Forwarded-User`를 붙여 200을 받습니다.
-
-Keycloak이 발급하는 issuer는 브라우저 기준
-`http://localhost:8080/realms/keycloak-patterns`입니다. 컨테이너 내부의
-`localhost`는 oauth2-proxy 자신이므로 discovery endpoint에 도달할 수
-없습니다. 그래서 이 로컬 Compose 구성은 issuer 검증값은 외부 URL로
-유지하되, login URL은 브라우저용 외부 주소, token/JWKS/userinfo는
-`http://keycloak:8080` 내부 주소로 각각 명시합니다.
-
-HTTP 로컬 시연이라 `cookie-secure=false`를 사용합니다. 운영 HTTPS에서는
-반드시 secure cookie로 되돌려야 합니다.
-
-## 다음 단계의 보안 전제
-
-이 첫 feature의 backend는 전달된 사용자 헤더를 신뢰하며 8081도
-loopback에 publish되어 있습니다. 따라서 로컬에서 직접
-`X-Forwarded-User: spoofed-admin`을 보내면 우회가 재현됩니다. 이후
-Nginx `auth_request` 통합을 거쳐 최종 feature에서 backend no-publish와
-내부 shared-secret 검증을 함께 적용합니다.
-
-## 두 번째 단계: Nginx `auth_request`
-
-`feature/keycloak-nginx-auth-request-integration`부터 외부 진입점은
-`http://localhost:8088` Nginx 하나입니다. oauth2-proxy의 4180 포트는
-Compose 네트워크에만 expose됩니다.
-
-- Nginx의 정확 일치 `location = /oauth2/auth`는 `internal`이라 외부에서
-  직접 호출할 수 없습니다.
-- 인증 서브리퀘스트에는 본문을 보내지 않고 `Content-Length`도
-  비웁니다.
-- 일반 브라우저 요청의 401은 `/oauth2/start` 302로 변환합니다.
-- API 요청 `/api/edge`는 redirect하지 않고 JSON 401을 반환합니다.
-- 인증 성공 시 oauth2-proxy의 `X-Auth-Request-User`와 email만 backend로
-  전달합니다.
-
-Nginx 컨테이너 IP를 전용 Compose subnet에서 고정하고 oauth2-proxy의
-trusted proxy를 그 단일 IP로 제한합니다. 다만 이 단계에서는 backend
-8081이 로컬 호스트에 열려 있어 신뢰 헤더를 직접 위조할 수 있습니다.
-그 재현 조건은 마지막 feature에서 제거합니다.
-
-## 마지막 단계: 신뢰 경계와 헤더 스푸핑 방어
-
-`feature/keycloak-header-spoofing-defense`에서는 신뢰 경계를 실제
-네트워크와 application 양쪽에서 강제합니다.
-
-1. backend 8081과 oauth2-proxy 4180은 host에 publish하지 않습니다.
-   브라우저가 접근 가능한 application 포트는 Nginx 8088뿐입니다.
-2. Nginx는 client가 보낸 `X-Auth-Request-User`, email, 내부 토큰을
-   그대로 전달하지 않고 oauth2-proxy 결과와 server-side 토큰으로
-   항상 덮어씁니다.
-3. backend는 `X-Auth-Request-User`와 `X-Internal-Auth-Token`이 모두
-   유효할 때만 edge identity를 받아들이며 token은 constant-time으로
-   비교합니다.
-
-shared token은 방어 심층화 수단입니다. 운영에서는 Secret Manager나
-orchestrator secret으로 주입하고 주기적으로 교체해야 합니다. 서비스
-간 mTLS 또는 service mesh identity를 사용할 수 있다면 단순 shared
-token보다 강한 workload identity로 대체하는 편이 좋습니다.

e2e/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "type": "module",
   "scripts": {
-    "test:pattern4": "node pattern4.mjs"
+    "test:pattern1": "node pattern1.mjs"
   },
   "devDependencies": {
     "playwright-core": "1.62.0"

e2e/pattern1.mjs

@@ -0,0 +1,101 @@
+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 payload = JSON.parse(
+    Buffer.from(accessToken.split(".")[1], "base64url").toString("utf8"),
+  );
+  const audiences = Array.isArray(payload.aud) ? payload.aud : [payload.aud];
+  assert.ok(
+    audiences.includes("keycloak-pattern-api"),
+    "access token must target keycloak-pattern-api",
+  );
+
+  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');
+  });
+
+  if (process.env.WRONG_AUDIENCE_URL) {
+    const response = await fetch(process.env.WRONG_AUDIENCE_URL, {
+      headers: { Authorization: `Bearer ${accessToken}` },
+    });
+    assert.equal(
+      response.status,
+      401,
+      "the same signed token must fail when the Resource Server expects another audience",
+    );
+  }
+
+  if (process.env.WRONG_ISSUER_URL) {
+    const response = await fetch(process.env.WRONG_ISSUER_URL, {
+      headers: { Authorization: `Bearer ${accessToken}` },
+    });
+    assert.equal(
+      response.status,
+      401,
+      "the same signed token must fail when the Resource Server expects another issuer",
+    );
+  }
+
+  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, audience/issuer negatives 401, Web Storage token 0, reload clears token",
+  );
+} finally {
+  await browser.close();
+}

e2e/pattern4.mjs

@@ -1,138 +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 edgeBaseUrl = "http://localhost:8088";
-const edgeEntryUrl = `${edgeBaseUrl}/`;
-
-async function completeKeycloakLogin(page) {
-  for (let attempt = 1; attempt <= 2; attempt += 1) {
-    await page.locator("#username").fill(
-      process.env.E2E_USERNAME ?? "regular-user",
-    );
-    await page.locator("#password").fill(password);
-    await page.locator("#kc-login").click();
-    await page.waitForLoadState("domcontentloaded");
-
-    if (page.url() === edgeEntryUrl) {
-      return;
-    }
-    if (attempt === 1) {
-      await page.goto(`${edgeBaseUrl}/oauth2/start?rd=${encodeURIComponent(edgeEntryUrl)}`);
-      await page.waitForURL(/localhost:8080/u);
-    }
-  }
-  throw new Error(`Keycloak login did not return to AP4: ${page.url()}`);
-}
-
-const browser = await chromium.launch({
-  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
-  headless: true,
-  args: ["--no-sandbox"],
-});
-
-try {
-  const context = await browser.newContext();
-  const page = await context.newPage();
-  const browserRequests = [];
-  page.on("request", (request) =>
-    browserRequests.push({ method: request.method(), url: request.url() }),
-  );
-
-  const edgeResponsePromise = page.waitForResponse(
-    (response) =>
-      response.url() === edgeEntryUrl &&
-      response.status() === 302,
-  );
-  const authorizationRequestPromise = page.waitForRequest((request) =>
-    request.url().includes(
-      "/protocol/openid-connect/auth?approval_prompt=",
-    ),
-  );
-  await page.goto(edgeEntryUrl);
-  const unauthenticatedEdgeResponse = await edgeResponsePromise;
-  assert.equal(unauthenticatedEdgeResponse.status(), 302);
-
-  const authorizationRequest = await authorizationRequestPromise;
-  const authorizationUrl = new URL(authorizationRequest.url());
-  assert.equal(authorizationUrl.searchParams.get("client_id"), "edge-proxy");
-  assert.equal(authorizationUrl.searchParams.get("code_challenge_method"), "S256");
-  assert.ok(authorizationUrl.searchParams.get("code_challenge"));
-
-  await page.waitForURL(/localhost:8080/u);
-  await completeKeycloakLogin(page);
-  const edgeIdentity = JSON.parse(await page.locator("body").innerText());
-  assert.equal(edgeIdentity.pattern, "AP4-edge-forward-auth");
-  assert.ok(edgeIdentity.user);
-  assert.equal(edgeIdentity.identityHeader, "X-Auth-Request-User");
-
-  const callbackRequest = browserRequests.find(({ url }) =>
-    url.startsWith(`${edgeBaseUrl}/oauth2/callback?`),
-  );
-  assert.ok(callbackRequest);
-  assert.equal(callbackRequest.method, "GET");
-  assert.equal(
-    browserRequests.some(({ url }) =>
-      url.includes("/protocol/openid-connect/token"),
-    ),
-    false,
-    "the confidential token exchange must be server-to-server",
-  );
-
-  const cookies = await context.cookies(edgeEntryUrl);
-  const sessionCookie = cookies.find((cookie) => cookie.name === "AP4_SESSION");
-  assert.ok(sessionCookie);
-  assert.equal(sessionCookie.httpOnly, true);
-  assert.equal(sessionCookie.sameSite, "Lax");
-  assert.equal(sessionCookie.secure, false);
-
-  const storage = await page.evaluate(() => ({
-    localStorage: Object.values(localStorage),
-    sessionStorage: Object.values(sessionStorage),
-    readableCookies: document.cookie,
-  }));
-  assert.deepEqual(storage.localStorage, []);
-  assert.deepEqual(storage.sessionStorage, []);
-  assert.equal(storage.readableCookies.includes("AP4_SESSION"), false);
-
-  const spoofAttempt = await page.evaluate(async () => {
-    const response = await fetch("/", {
-      headers: {
-        "X-Auth-Request-User": "spoofed-admin",
-        "X-Auth-Request-Email": "spoofed-admin@example.test",
-        "X-Internal-Auth-Token": "attacker-controlled-token",
-      },
-    });
-    return { status: response.status, body: await response.json() };
-  });
-  assert.equal(spoofAttempt.status, 200);
-  assert.equal(spoofAttempt.body.user, edgeIdentity.user);
-  assert.notEqual(spoofAttempt.body.user, "spoofed-admin");
-
-  const externalAuthSubrequest = await fetch(`${edgeBaseUrl}/oauth2/auth`);
-  assert.equal(externalAuthSubrequest.status, 404);
-
-  const apiResponse = await fetch(`${edgeBaseUrl}/api/edge`, {
-    redirect: "manual",
-  });
-  assert.equal(apiResponse.status, 401);
-  assert.equal(apiResponse.headers.get("location"), null);
-
-  await assert.rejects(
-    fetch("http://localhost:4180/ping"),
-    "oauth2-proxy must not be published on the host",
-  );
-
-  await assert.rejects(
-    fetch("http://localhost:8081/edge/me"),
-    "backend must not be published on the host",
-  );
-
-  console.log(
-    "pattern4 hardened edge verified: auth_request, no backend publish, spoofed headers overwritten",
-  );
-} 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 default.conf.template /etc/nginx/templates/default.conf.template
+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/default.conf.template

@@ -1,75 +0,0 @@
-server {
-    listen 80;
-    server_name _;
-
-    large_client_header_buffers 4 16k;
-
-    location = /health {
-        access_log off;
-        default_type text/plain;
-        return 200 "ok\n";
-    }
-
-    location = /oauth2/auth {
-        internal;
-        proxy_pass http://oauth2-proxy:4180;
-        proxy_pass_request_body off;
-        proxy_set_header Content-Length "";
-        proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
-        proxy_set_header X-Real-IP $remote_addr;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header X-Forwarded-Host $http_host;
-        proxy_set_header X-Forwarded-Proto $scheme;
-        proxy_set_header X-Forwarded-Uri $request_uri;
-    }
-
-    location /oauth2/ {
-        proxy_pass http://oauth2-proxy:4180;
-        proxy_http_version 1.1;
-        proxy_set_header Host $http_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-Host $http_host;
-        proxy_set_header X-Forwarded-Proto $scheme;
-        proxy_set_header X-Auth-Request-Redirect $scheme://$http_host$request_uri;
-    }
-
-    location = /api/edge {
-        auth_request /oauth2/auth;
-        error_page 401 = @api_unauthorized;
-
-        auth_request_set $auth_user $upstream_http_x_auth_request_user;
-        auth_request_set $auth_email $upstream_http_x_auth_request_email;
-        auth_request_set $auth_cookie $upstream_http_set_cookie;
-        add_header Set-Cookie $auth_cookie always;
-
-        proxy_pass http://app:8081/edge/me;
-        proxy_set_header X-Auth-Request-User $auth_user;
-        proxy_set_header X-Auth-Request-Email $auth_email;
-        proxy_set_header X-Internal-Auth-Token "${INTERNAL_AUTH_TOKEN}";
-    }
-
-    location / {
-        auth_request /oauth2/auth;
-        error_page 401 = @oauth2_signin;
-
-        auth_request_set $auth_user $upstream_http_x_auth_request_user;
-        auth_request_set $auth_email $upstream_http_x_auth_request_email;
-        auth_request_set $auth_cookie $upstream_http_set_cookie;
-        add_header Set-Cookie $auth_cookie always;
-
-        proxy_pass http://app:8081/edge/me;
-        proxy_set_header X-Auth-Request-User $auth_user;
-        proxy_set_header X-Auth-Request-Email $auth_email;
-        proxy_set_header X-Internal-Auth-Token "${INTERNAL_AUTH_TOKEN}";
-    }
-
-    location @oauth2_signin {
-        return 302 $scheme://$http_host/oauth2/start?rd=$scheme://$http_host$request_uri;
-    }
-
-    location @api_unauthorized {
-        default_type application/json;
-        return 401 '{"error":"authentication required"}';
-    }
-}

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;
-      margin: 8vh auto;
+      max-width: 56rem;
+      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;
-      border-radius: 0.25rem;
-      background: color-mix(in srgb, CanvasText 10%, Canvas);
+      padding: 0.1rem 0.3rem;
+    }
+    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>
-  <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>
+  <main>
+    <h1>AP1 · SPA Direct + Resource Server</h1>
+    <p>
+      바닐라 JavaScript SPA가 <code>spa-public</code> client로 Authorization
+      Code + PKCE를 수행하고, access token을 직접 Spring Resource Server에
+      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

@@ -0,0 +1,27 @@
+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 / {
+        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"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.1.tgz",
+      "integrity": "sha512-Svl7tq8k/08+p6CXPpRjQ1fKX+1odH/BQbb48fV6fj3CWHhsoIOoY87w1oHXm0qEpkIK3ZfVgp0hed3XBXzXMQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.28.1.tgz",
+      "integrity": "sha512-0k2F129Xdio1TdJfzJ8sy1Q47vUD2NnwdhiAf7drUN1EBTfPf4hsFCtmMgu/6m8JSzsBrlmVjudMBQqOfG8usQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.28.1.tgz",
+      "integrity": "sha512-34EGEbCIAgosYz6goLcopX6Mo7NyGv9tfwEM2/7Ce2VcVRk568iSvniGWcUXIy7wEDR1wzolcxcriFVrWYcwBg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.28.1.tgz",
+      "integrity": "sha512-dbwY7ltSMDWsRatcRpCnES4F+im88OCUgGZjy52shC7GqHRE/cYlxNbB4Z4UpJswpcc4Qxd2oE/ufM0p61IKng==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.28.1.tgz",
+      "integrity": "sha512-TZbWkQY7kvTAXbXUT7uVACR5cMHsDiSz9z7ZKAX/RTq/WJEk3QyRr0wZpNhBDX+/0CtdqUIJlOiodQcta6tY3Q==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
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+      "license": "MIT",
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+}

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);
+});

keycloak/import/keycloak-patterns-realm.json

@@ -51,7 +51,22 @@
       "attributes": {
         "pkce.code.challenge.method": "S256",
         "post.logout.redirect.uris": "http://localhost:8088/*##http://127.0.0.1:8088/*"
-      }
+      },
+      "protocolMappers": [
+        {
+          "name": "keycloak-pattern-api-audience",
+          "protocol": "openid-connect",
+          "protocolMapper": "oidc-audience-mapper",
+          "consentRequired": false,
+          "config": {
+            "included.custom.audience": "keycloak-pattern-api",
+            "id.token.claim": "false",
+            "access.token.claim": "true",
+            "userinfo.token.claim": "false",
+            "introspection.token.claim": "true"
+          }
+        }
+      ]
     },
     {
       "clientId": "token-mediating-confidential",
@@ -116,11 +131,10 @@
       "serviceAccountsEnabled": false,
       "frontchannelLogout": true,
       "redirectUris": [
-        "http://localhost:8088/oauth2/callback"
+        "http://localhost:4180/oauth2/callback"
       ],
       "webOrigins": [],
       "attributes": {
-        "pkce.code.challenge.method": "S256",
         "post.logout.redirect.uris": "http://localhost:8088/*"
       }
     }

scripts/validate-realm.py

@@ -70,6 +70,18 @@ def validate(path: Path, runtime: bool) -> None:
         spa.get("attributes", {}).get("pkce.code.challenge.method") == "S256",
         "spa-public must enforce PKCE S256",
     )
+    audience_mappers = [
+        mapper
+        for mapper in spa.get("protocolMappers", [])
+        if mapper.get("protocolMapper") == "oidc-audience-mapper"
+    ]
+    if not runtime:
+        require(len(audience_mappers) == 1, "spa-public must declare one audience mapper")
+        require(
+            audience_mappers[0].get("config", {}).get("included.custom.audience")
+            == "keycloak-pattern-api",
+            "spa-public access token must target keycloak-pattern-api",
+        )
 
     for client_id, placeholder in CONFIDENTIAL_CLIENTS.items():
         client = clients[client_id]

scripts/verify-pattern1.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env; copy .env.example and set local-only values" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+docker compose down --volumes --remove-orphans
+docker compose up --build -d --wait
+docker compose --profile diagnostics up -d --wait \
+  app-wrong-audience \
+  app-wrong-issuer
+
+npm --prefix e2e ci
+E2E_USERNAME=regular-user \
+E2E_PASSWORD="$REGULAR_USER_PASSWORD" \
+WRONG_AUDIENCE_URL=http://localhost:18081/api/me \
+WRONG_ISSUER_URL=http://localhost:18082/api/me \
+  npm --prefix e2e run test:pattern1
+
+echo "AP1 verified end to end"

scripts/verify-pattern4.sh

@@ -1,41 +0,0 @@
-#!/usr/bin/env sh
-set -eu
-
-if [ ! -f .env ]; then
-  echo "missing .env; copy .env.example and set development values" >&2
-  exit 1
-fi
-
-set -a
-. ./.env
-set +a
-
-docker compose down --volumes --remove-orphans
-docker compose up --build -d --wait
-
-docker compose exec -T nginx nginx -V 2>&1 |
-  grep -q -- '--with-http_auth_request_module'
-docker compose exec -T nginx nginx -T 2>&1 |
-  grep -q 'proxy_pass_request_body off'
-
-app_container_id="$(docker compose ps -q app)"
-published_app_port="$(docker inspect "$app_container_id" \
-  --format '{{with (index .NetworkSettings.Ports "8081/tcp")}}{{json .}}{{end}}')"
-if [ -n "$published_app_port" ]; then
-  echo "backend port 8081 must not be published on the host" >&2
-  exit 1
-fi
-
-if docker compose exec -T nginx wget -q -O /dev/null \
-  --header 'X-Auth-Request-User: spoofed-admin' \
-  http://app:8081/edge/me 2>/dev/null; then
-  echo "backend accepted a forged identity without the internal token" >&2
-  exit 1
-fi
-
-npm --prefix e2e ci
-E2E_USERNAME=regular-user \
-E2E_PASSWORD="$REGULAR_USER_PASSWORD" \
-  npm --prefix e2e run test:pattern4
-
-echo "AP4 hardened Nginx auth_request edge flow verified"