refactor: oauth2 resource server 도입

apis/build.gradle.kts

@@ -14,10 +14,6 @@ dependencies {
 
     implementation(Dependencies.Database.MYSQL_CONNECTOR)
 
-    implementation(Dependencies.Auth.JWT)
-    implementation(Dependencies.Auth.JWT_IMPL)
-    implementation(Dependencies.Auth.JWT_JACKSON)
-
     implementation(Dependencies.Swagger.SPRINGDOC_OPENAPI_STARTER_WEBMVC_UI)
 
     implementation(Dependencies.Logging.KOTLIN_LOGGING)

apis/src/main/kotlin/org/yapp/apis/auth/controller/AuthController.kt

@@ -29,7 +29,7 @@ class AuthController(
 
     @PostMapping("/refresh")
     override fun refreshToken(@RequestBody @Valid request: TokenRefreshRequest): ResponseEntity<AuthResponse> {
-        val tokenPair = authUseCase.refreshToken(request.validRefreshToken())
+        val tokenPair = authUseCase.reissueTokenPair(request.validRefreshToken())
         return ResponseEntity.ok(AuthResponse.fromTokenPair(tokenPair))
     }
 

apis/src/main/kotlin/org/yapp/apis/auth/helper/AuthTokenHelper.kt

@@ -4,16 +4,16 @@ import org.yapp.apis.auth.dto.response.TokenPairResponse
 import org.yapp.apis.auth.service.TokenService
 import org.yapp.gateway.jwt.JwtTokenService
 import org.yapp.globalutils.annotation.Helper
+import org.yapp.globalutils.auth.Role
 import java.util.*
 
 @Helper
 class AuthTokenHelper(
     private val tokenService: TokenService,
     private val jwtTokenService: JwtTokenService
 ) {
-
-    fun generateTokenPair(userId: UUID): TokenPairResponse {
-        val accessToken = jwtTokenService.generateAccessToken(userId)
+    fun generateTokenPair(userId: UUID, role: Role): TokenPairResponse {
+        val accessToken = jwtTokenService.generateAccessToken(userId, role)
         val refreshToken = jwtTokenService.generateRefreshToken(userId)
         val expiration = jwtTokenService.getRefreshTokenExpiration()
 
@@ -26,10 +26,6 @@ class AuthTokenHelper(
         return tokenService.getUserIdFromToken(refreshToken)
     }
 
-    fun getUserIdFromAccessToken(accessToken: String): UUID {
-        return jwtTokenService.getUserIdFromToken(accessToken)
-    }
-
     fun deleteToken(token: String) {
         tokenService.deleteByToken(token)
     }

apis/src/main/kotlin/org/yapp/apis/auth/usecase/AuthUseCase.kt

@@ -1,6 +1,5 @@
 package org.yapp.apis.auth.usecase
 
-import org.springframework.transaction.annotation.Propagation
 import org.springframework.transaction.annotation.Transactional
 import org.yapp.apis.auth.dto.AuthCredentials
 import org.yapp.apis.auth.dto.response.TokenPairResponse
@@ -20,20 +19,20 @@ class AuthUseCase(
     private val tokenService: TokenService,
     private val authTokenHelper: AuthTokenHelper
 ) {
-
     @Transactional
     fun signIn(credentials: AuthCredentials): TokenPairResponse {
         val strategy = socialAuthService.resolve(credentials)
         val userInfo = strategy.authenticate(credentials)
         val user = userAuthService.findOrCreateUser(userInfo)
-        return authTokenHelper.generateTokenPair(user.id)
+        return authTokenHelper.generateTokenPair(user.id, user.role)
     }
 
     @Transactional
-    fun refreshToken(refreshToken: String): TokenPairResponse {
+    fun reissueTokenPair(refreshToken: String): TokenPairResponse {
         val userId = authTokenHelper.validateAndGetUserIdFromRefreshToken(refreshToken)
         authTokenHelper.deleteToken(refreshToken)
-        return authTokenHelper.generateTokenPair(userId)
+        val user = userAuthService.findUserById(userId)
+        return authTokenHelper.generateTokenPair(user.id, user.role)
     }
 
     @Transactional

buildSrc/src/main/kotlin/Dependencies.kt

@@ -8,19 +8,14 @@ object Dependencies {
         const val BOOT_STARTER_ACTUATOR = "org.springframework.boot:spring-boot-starter-actuator"
         const val BOOT_STARTER_TEST = "org.springframework.boot:spring-boot-starter-test"
         const val BOOT_STARTER_DATA_REDIS = "org.springframework.boot:spring-boot-starter-data-redis"
+        const val BOOT_STARTER_OAUTH2_RESOURCE_SERVER = "org.springframework.boot:spring-boot-starter-oauth2-resource-server"
         const val KOTLIN_REFLECT = "org.jetbrains.kotlin:kotlin-reflect"
     }
 
     object Database {
         const val MYSQL_CONNECTOR = "com.mysql:mysql-connector-j"
     }
 
-    object Auth {
-        const val JWT = "io.jsonwebtoken:jjwt-api:0.11.5"
-        const val JWT_IMPL = "io.jsonwebtoken:jjwt-impl:0.11.5"
-        const val JWT_JACKSON = "io.jsonwebtoken:jjwt-jackson:0.11.5"
-    }
-
     object Swagger {
         const val SPRINGDOC_OPENAPI_STARTER_WEBMVC_UI = "org.springdoc:springdoc-openapi-starter-webmvc-ui:2.3.0"
     }

domain/src/main/kotlin/org/yapp/domain/user/User.kt

@@ -1,6 +1,6 @@
 package org.yapp.domain.user
 
-import org.yapp.domain.user.ProviderType
+import org.yapp.globalutils.auth.Role
 import java.time.LocalDateTime
 import java.util.*
 
@@ -13,6 +13,7 @@ import java.util.*
  * @property profileImageUrl The URL of the user's profile image.
  * @property providerType The type of authentication provider.
  * @property providerId The ID from the authentication provider.
+ * @property role The roles of the user (e.g., USER, ADMIN).
  * @property createdAt The timestamp when the user was created.
  * @property updatedAt The timestamp when the user was last updated.
  * @property deletedAt The timestamp when the user was soft-deleted, or null if the user is not deleted.
@@ -24,6 +25,7 @@ data class User private constructor(
     val profileImageUrl: String?,
     val providerType: ProviderType,
     val providerId: String,
+    val role: Role,
     val createdAt: LocalDateTime,
     val updatedAt: LocalDateTime,
     val deletedAt: LocalDateTime? = null
@@ -37,15 +39,14 @@ data class User private constructor(
         )
     }
 
-    fun isDeleted(): Boolean = deletedAt != null
-
     companion object {
         fun create(
             email: String,
             nickname: String,
             profileImageUrl: String?,
             providerType: ProviderType,
             providerId: String,
+            role: Role,
             createdAt: LocalDateTime,
             updatedAt: LocalDateTime,
             deletedAt: LocalDateTime? = null
@@ -57,6 +58,7 @@ data class User private constructor(
                 profileImageUrl = profileImageUrl,
                 providerType = providerType,
                 providerId = providerId,
+                role = role,
                 createdAt = createdAt,
                 updatedAt = updatedAt,
                 deletedAt = deletedAt
@@ -70,6 +72,7 @@ data class User private constructor(
             profileImageUrl: String?,
             providerType: ProviderType,
             providerId: String,
+            role: Role,
             createdAt: LocalDateTime,
             updatedAt: LocalDateTime,
             deletedAt: LocalDateTime? = null
@@ -81,10 +84,13 @@ data class User private constructor(
                 profileImageUrl = profileImageUrl,
                 providerType = providerType,
                 providerId = providerId,
+                role = role,
                 createdAt = createdAt,
                 updatedAt = updatedAt,
                 deletedAt = deletedAt
             )
         }
     }
+
+    private fun isDeleted(): Boolean = deletedAt != null
 }

domain/src/main/kotlin/org/yapp/domain/user/UserDomainService.kt

@@ -2,6 +2,7 @@ package org.yapp.domain.user
 
 import org.yapp.domain.user.vo.SocialUserProfile
 import org.yapp.globalutils.annotation.DomainService
+import org.yapp.globalutils.auth.Role
 import org.yapp.globalutils.util.TimeProvider
 import java.util.UUID
 
@@ -34,6 +35,7 @@ class UserDomainService(
             profileImageUrl = profile.profileImageUrl,
             providerType = profile.providerType,
             providerId = profile.providerId,
+            role = Role.USER,
             createdAt = now,
             updatedAt = now
         )

gateway/build.gradle.kts

@@ -4,9 +4,7 @@ dependencies {
     implementation(project(Dependencies.Projects.GLOBAL_UTILS))
     implementation(Dependencies.Spring.BOOT_STARTER_WEB)
     implementation(Dependencies.Spring.BOOT_STARTER_SECURITY)
-    implementation(Dependencies.Auth.JWT)
-    implementation(Dependencies.Auth.JWT_IMPL)
-    implementation(Dependencies.Auth.JWT_JACKSON)
+    implementation(Dependencies.Spring.BOOT_STARTER_OAUTH2_RESOURCE_SERVER)
     testImplementation(Dependencies.Spring.BOOT_STARTER_TEST)
 }
 

gateway/src/main/kotlin/org/yapp/gateway/config/JwtConfig.kt

@@ -0,0 +1,83 @@
+package org.yapp.gateway.config
+
+import com.nimbusds.jose.jwk.JWKSet
+import com.nimbusds.jose.jwk.OctetSequenceKey
+import com.nimbusds.jose.jwk.source.ImmutableJWKSet
+import com.nimbusds.jose.jwk.source.JWKSource
+import com.nimbusds.jose.proc.SecurityContext
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.core.authority.SimpleGrantedAuthority
+import org.springframework.security.oauth2.jose.jws.MacAlgorithm
+import org.springframework.security.oauth2.jwt.*
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter
+import org.yapp.gateway.constants.JwtConstants
+import javax.crypto.spec.SecretKeySpec
+
+@Configuration
+class JwtConfig(
+    @Value("\${jwt.secret-key}")
+    private val secretKey: String
+) {
+    companion object {
+        private val SIGNATURE_ALGORITHM = MacAlgorithm.HS256
+        private const val PRINCIPAL_CLAIM = "sub"
+    }
+
+    /**
+     * JWT를 암호화하고 서명하는 데 사용될 키의 소스(`JWKSource`)를 생성하여 Bean으로 등록합니다.
+     * HMAC-SHA 알고리즘에 사용될 대칭 키를 `OctetSequenceKey` 형태로 래핑하여 제공합니다.
+     *
+     * @return 생성된 `JWKSource<SecurityContext>` 객체
+     */
+    @Bean
+    fun jwkSource(): JWKSource<SecurityContext> {
+        val jwk: OctetSequenceKey = OctetSequenceKey.Builder(secretKey.toByteArray()).build()
+        return ImmutableJWKSet(JWKSet(jwk))
+    }
+
+    /**
+     * JWT를 생성(인코딩)하는 `JwtEncoder`를 생성하여 Bean으로 등록합니다.
+     * 주입받은 `JWKSource`를 사용하여 토큰에 디지털 서명을 수행합니다.
+     *
+     * @param jwkSource 토큰 서명에 사용될 키 소스
+     * @return 생성된 `JwtEncoder` 객체
+     */
+    @Bean
+    fun jwtEncoder(jwkSource: JWKSource<SecurityContext>): JwtEncoder {
+        return NimbusJwtEncoder(jwkSource)
+    }
+
+    /**
+     * 클라이언트로부터 받은 JWT를 검증(디코딩)하는 `JwtDecoder`를 생성하여 Bean으로 등록합니다.
+     * 토큰의 서명, 만료 시간(기본 검증) 및 발급자(issuer)가 일치하는지 확인합니다.
+     *
+     * @return 생성된 `JwtDecoder` 객체
+     */
+    @Bean
+    fun jwtDecoder(): JwtDecoder {
+        val secretKeySpec = SecretKeySpec(secretKey.toByteArray(), SIGNATURE_ALGORITHM.name)
+        val decoder = NimbusJwtDecoder.withSecretKey(secretKeySpec).build()
+        val validator = JwtValidators.createDefaultWithIssuer(JwtConstants.ISSUER)
+        decoder.setJwtValidator(validator)
+        return decoder
+    }
+
+    /**
+     * 유효성이 검증된 JWT를 Spring Security의 `Authentication` 객체로 변환하는 `JwtAuthenticationConverter`를 등록합니다.
+     * JWT의 'roles' 클레임을 애플리케이션의 권한 정보(`GrantedAuthority`)로 매핑하고, 'sub' 클레임을 사용자의 주체(Principal)로 설정합니다.
+     *
+     * @return 생성된 `JwtAuthenticationConverter` 객체
+     */
+    @Bean
+    fun jwtAuthenticationConverter(): JwtAuthenticationConverter {
+        val converter = JwtAuthenticationConverter()
+        converter.setJwtGrantedAuthoritiesConverter { jwt ->
+            val roles = jwt.getClaimAsStringList(JwtConstants.ROLES_CLAIM) ?: emptyList()
+            roles.map { role -> SimpleGrantedAuthority(role) }
+        }
+        converter.setPrincipalClaimName(PRINCIPAL_CLAIM)
+        return converter
+    }
+}

gateway/src/main/kotlin/org/yapp/gateway/constants/JwtConstants.kt

@@ -0,0 +1,6 @@
+package org.yapp.gateway.constants
+
+object JwtConstants {
+    const val ROLES_CLAIM = "roles"
+    const val ISSUER = "gateway"
+}