공통 API 응답 및 JWT 보안 기반 구축

src/main/kotlin/team/cklob/arena/ArenaApplication.kt

@@ -1,9 +1,11 @@
 package team.cklob.arena
 
 import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.context.properties.ConfigurationPropertiesScan
 import org.springframework.boot.runApplication
 
 @SpringBootApplication
+@ConfigurationPropertiesScan
 class ArenaApplication
 
 fun main(args: Array<String>) {

src/main/kotlin/team/cklob/arena/challenge/ChallengeErrorCode.kt

@@ -0,0 +1,11 @@
+package team.cklob.arena.challenge
+
+import org.springframework.http.HttpStatus
+import team.cklob.arena.common.ErrorCode
+
+enum class ChallengeErrorCode(
+    override val status: HttpStatus,
+    override val message: String,
+) : ErrorCode {
+    CHALLENGE_ALREADY_ENDED(HttpStatus.CONFLICT, "이미 종료된 챌린지입니다."),
+}

src/main/kotlin/team/cklob/arena/common/ApiResponse.kt

@@ -0,0 +1,36 @@
+package team.cklob.arena.common
+
+data class CommonApiResponse<T>(
+    val code: String,
+    val message: String,
+    val data: T? = null,
+) {
+    companion object {
+        fun <T> success(data: T): CommonApiResponse<T> =
+            CommonApiResponse(
+                code = "SUCCESS",
+                message = "성공했습니다.",
+                data = data,
+            )
+
+        fun error(
+            errorCode: ErrorCode,
+            message: String = errorCode.message,
+            data: Any? = null,
+        ): CommonApiResponse<Any> =
+            CommonApiResponse(
+                code = errorCode.code,
+                message = message,
+                data = data,
+            )
+    }
+}
+
+data class FieldErrorDetail(
+    val field: String,
+    val reason: String,
+)
+
+data class ValidationErrorData(
+    val fieldErrors: List<FieldErrorDetail>,
+)

src/main/kotlin/team/cklob/arena/common/CommonErrorCode.kt

@@ -0,0 +1,15 @@
+package team.cklob.arena.common
+
+import org.springframework.http.HttpStatus
+
+enum class CommonErrorCode(
+    override val status: HttpStatus,
+    override val message: String,
+) : ErrorCode {
+    INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청입니다."),
+    MALFORMED_JSON(HttpStatus.BAD_REQUEST, "요청 본문 형식이 올바르지 않습니다."),
+    INVALID_TYPE_VALUE(HttpStatus.BAD_REQUEST, "요청 값의 형식이 올바르지 않습니다."),
+    METHOD_NOT_ALLOWED(HttpStatus.METHOD_NOT_ALLOWED, "지원하지 않는 HTTP 메서드입니다."),
+    RESOURCE_NOT_FOUND(HttpStatus.NOT_FOUND, "요청한 리소스를 찾을 수 없습니다."),
+    INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "서버 오류가 발생했습니다."),
+}

src/main/kotlin/team/cklob/arena/common/CommonResponseAdvice.kt

@@ -0,0 +1,34 @@
+package team.cklob.arena.common
+
+import org.springframework.core.MethodParameter
+import org.springframework.http.MediaType
+import org.springframework.http.ResponseEntity
+import org.springframework.http.converter.HttpMessageConverter
+import org.springframework.http.server.ServerHttpRequest
+import org.springframework.http.server.ServerHttpResponse
+import org.springframework.web.bind.annotation.RestControllerAdvice
+import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice
+
+@RestControllerAdvice
+class CommonResponseAdvice : ResponseBodyAdvice<Any> {
+    override fun supports(
+        returnType: MethodParameter,
+        converterType: Class<out HttpMessageConverter<*>>,
+    ): Boolean =
+        returnType.parameterType != String::class.java &&
+            !ResponseEntity::class.java.isAssignableFrom(returnType.parameterType)
+
+    override fun beforeBodyWrite(
+        body: Any?,
+        returnType: MethodParameter,
+        selectedContentType: MediaType,
+        selectedConverterType: Class<out HttpMessageConverter<*>>,
+        request: ServerHttpRequest,
+        response: ServerHttpResponse,
+    ): Any? =
+        if (body is CommonApiResponse<*>) {
+            body
+        } else {
+            CommonApiResponse.success(body)
+        }
+}

src/main/kotlin/team/cklob/arena/common/ErrorCode.kt

@@ -0,0 +1,10 @@
+package team.cklob.arena.common
+
+import org.springframework.http.HttpStatus
+
+interface ErrorCode {
+    val status: HttpStatus
+    val message: String
+    val code: String
+        get() = (this as Enum<*>).name
+}

src/main/kotlin/team/cklob/arena/common/ExpectedException.kt

@@ -0,0 +1,6 @@
+package team.cklob.arena.common
+
+class ExpectedException(
+    val errorCode: ErrorCode,
+    messageOverride: String? = null,
+) : RuntimeException(messageOverride ?: errorCode.message)

src/main/kotlin/team/cklob/arena/common/GlobalExceptionHandler.kt

@@ -0,0 +1,87 @@
+package team.cklob.arena.common
+
+import com.fasterxml.jackson.databind.exc.InvalidFormatException
+import jakarta.validation.ConstraintViolationException
+import org.slf4j.LoggerFactory
+import org.springframework.http.ResponseEntity
+import org.springframework.http.converter.HttpMessageNotReadableException
+import org.springframework.validation.BindException
+import org.springframework.web.HttpRequestMethodNotSupportedException
+import org.springframework.web.bind.MethodArgumentNotValidException
+import org.springframework.web.bind.annotation.ExceptionHandler
+import org.springframework.web.bind.annotation.RestControllerAdvice
+import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException
+import org.springframework.web.servlet.NoHandlerFoundException
+import org.springframework.web.servlet.resource.NoResourceFoundException
+
+@RestControllerAdvice
+class GlobalExceptionHandler {
+    private val log = LoggerFactory.getLogger(javaClass)
+
+    @ExceptionHandler(ExpectedException::class)
+    fun handleExpectedException(exception: ExpectedException): ResponseEntity<CommonApiResponse<Any>> =
+        response(exception.errorCode, exception.message ?: exception.errorCode.message)
+
+    @ExceptionHandler(MethodArgumentNotValidException::class, BindException::class)
+    fun handleValidationException(exception: BindException): ResponseEntity<CommonApiResponse<Any>> {
+        val fieldErrors =
+            exception.bindingResult.fieldErrors.map {
+                FieldErrorDetail(field = it.field, reason = it.defaultMessage ?: "유효하지 않은 값입니다.")
+            }
+
+        return response(
+            errorCode = CommonErrorCode.INVALID_REQUEST,
+            data = ValidationErrorData(fieldErrors),
+        )
+    }
+
+    @ExceptionHandler(ConstraintViolationException::class)
+    fun handleConstraintViolation(exception: ConstraintViolationException): ResponseEntity<CommonApiResponse<Any>> =
+        response(
+            errorCode = CommonErrorCode.INVALID_REQUEST,
+            data =
+                ValidationErrorData(
+                    exception.constraintViolations.map {
+                        FieldErrorDetail(field = it.propertyPath.toString(), reason = it.message)
+                    },
+                ),
+        )
+
+    @ExceptionHandler(HttpMessageNotReadableException::class)
+    fun handleUnreadableMessage(exception: HttpMessageNotReadableException): ResponseEntity<CommonApiResponse<Any>> =
+        response(
+            if (exception.cause is InvalidFormatException) {
+                CommonErrorCode.INVALID_TYPE_VALUE
+            } else {
+                CommonErrorCode.MALFORMED_JSON
+            },
+        )
+
+    @ExceptionHandler(MethodArgumentTypeMismatchException::class)
+    fun handleTypeMismatch(exception: MethodArgumentTypeMismatchException): ResponseEntity<CommonApiResponse<Any>> =
+        response(CommonErrorCode.INVALID_TYPE_VALUE)
+
+    @ExceptionHandler(HttpRequestMethodNotSupportedException::class)
+    fun handleMethodNotSupported(exception: HttpRequestMethodNotSupportedException): ResponseEntity<CommonApiResponse<Any>> =
+        response(CommonErrorCode.METHOD_NOT_ALLOWED)
+
+    @ExceptionHandler(NoHandlerFoundException::class, NoResourceFoundException::class)
+    fun handleNotFound(exception: Exception): ResponseEntity<CommonApiResponse<Any>> {
+        return response(CommonErrorCode.RESOURCE_NOT_FOUND)
+    }
+
+    @ExceptionHandler(Exception::class)
+    fun handleUnexpectedException(exception: Exception): ResponseEntity<CommonApiResponse<Any>> {
+        log.error("Unhandled exception", exception)
+        return response(CommonErrorCode.INTERNAL_SERVER_ERROR)
+    }
+
+    private fun response(
+        errorCode: ErrorCode,
+        message: String = errorCode.message,
+        data: Any? = null,
+    ): ResponseEntity<CommonApiResponse<Any>> =
+        ResponseEntity
+            .status(errorCode.status)
+            .body(CommonApiResponse.error(errorCode, message, data))
+}

src/main/kotlin/team/cklob/arena/common/OpenApiConfig.kt

@@ -0,0 +1,31 @@
+package team.cklob.arena.common
+
+import io.swagger.v3.oas.models.Components
+import io.swagger.v3.oas.models.OpenAPI
+import io.swagger.v3.oas.models.media.ObjectSchema
+import io.swagger.v3.oas.models.media.StringSchema
+import io.swagger.v3.oas.models.security.SecurityScheme
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class OpenApiConfig {
+    @Bean
+    fun openApi(): OpenAPI =
+        OpenAPI().components(
+            Components()
+                .addSecuritySchemes(
+                    "bearerAuth",
+                    SecurityScheme()
+                        .type(SecurityScheme.Type.HTTP)
+                        .scheme("bearer")
+                        .bearerFormat("JWT"),
+                ).addSchemas(
+                    "CommonErrorResponse",
+                    ObjectSchema()
+                        .addProperty("code", StringSchema().example(CommonErrorCode.INVALID_REQUEST.code))
+                        .addProperty("message", StringSchema().example(CommonErrorCode.INVALID_REQUEST.message))
+                        .addProperty("data", ObjectSchema().nullable(true)),
+                ),
+        )
+}

src/main/kotlin/team/cklob/arena/recommendation/RecommendationErrorCode.kt

@@ -0,0 +1,11 @@
+package team.cklob.arena.recommendation
+
+import org.springframework.http.HttpStatus
+import team.cklob.arena.common.ErrorCode
+
+enum class RecommendationErrorCode(
+    override val status: HttpStatus,
+    override val message: String,
+) : ErrorCode {
+    RECOMMENDATION_ALREADY_REACTED(HttpStatus.CONFLICT, "이미 반응한 추천입니다."),
+}

src/main/kotlin/team/cklob/arena/security/JwtAuthenticationFilter.kt

@@ -0,0 +1,51 @@
+package team.cklob.arena.security
+
+import io.jsonwebtoken.ExpiredJwtException
+import io.jsonwebtoken.JwtException
+import jakarta.servlet.FilterChain
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
+import org.springframework.http.HttpHeaders
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken
+import org.springframework.security.core.context.SecurityContextHolder
+import org.springframework.web.filter.OncePerRequestFilter
+
+class JwtAuthenticationFilter(
+    private val jwtTokenProvider: JwtTokenProvider,
+    private val securityErrorHandler: SecurityErrorHandler,
+) : OncePerRequestFilter() {
+    override fun doFilterInternal(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        filterChain: FilterChain,
+    ) {
+        val authorization = request.getHeader(HttpHeaders.AUTHORIZATION)
+        if (authorization == null || !authorization.startsWith(BEARER_PREFIX)) {
+            filterChain.doFilter(request, response)
+            return
+        }
+
+        val token = authorization.removePrefix(BEARER_PREFIX)
+        if (token.isBlank()) {
+            securityErrorHandler.write(response, SecurityErrorCode.INVALID_TOKEN)
+            return
+        }
+
+        try {
+            val userId = jwtTokenProvider.getUserId(token)
+            val authentication = UsernamePasswordAuthenticationToken(userId, null, emptyList())
+            SecurityContextHolder.getContext().authentication = authentication
+            filterChain.doFilter(request, response)
+        } catch (exception: ExpiredJwtException) {
+            securityErrorHandler.write(response, SecurityErrorCode.EXPIRED_TOKEN)
+        } catch (exception: JwtException) {
+            securityErrorHandler.write(response, SecurityErrorCode.INVALID_TOKEN)
+        } catch (exception: IllegalArgumentException) {
+            securityErrorHandler.write(response, SecurityErrorCode.INVALID_TOKEN)
+        }
+    }
+
+    companion object {
+        private const val BEARER_PREFIX = "Bearer "
+    }
+}

src/main/kotlin/team/cklob/arena/security/JwtProperties.kt

@@ -0,0 +1,15 @@
+package team.cklob.arena.security
+
+import jakarta.validation.constraints.NotBlank
+import org.springframework.boot.context.properties.ConfigurationProperties
+import org.springframework.validation.annotation.Validated
+import java.time.Duration
+
+@Validated
+@ConfigurationProperties("security.jwt")
+data class JwtProperties(
+    /** Base64-encoded secret with at least 32 bytes before encoding. */
+    @field:NotBlank
+    val secret: String,
+    val accessTokenExpiration: Duration,
+)

src/main/kotlin/team/cklob/arena/security/JwtTokenProvider.kt

@@ -0,0 +1,36 @@
+package team.cklob.arena.security
+
+import io.jsonwebtoken.Claims
+import io.jsonwebtoken.Jwts
+import io.jsonwebtoken.io.Decoders
+import io.jsonwebtoken.security.Keys
+import java.time.Instant
+import java.util.Date
+import javax.crypto.SecretKey
+
+class JwtTokenProvider(
+    private val jwtProperties: JwtProperties,
+) {
+    fun createAccessToken(userId: Long): String {
+        val now = Instant.now()
+        return Jwts
+            .builder()
+            .subject(userId.toString())
+            .issuedAt(Date.from(now))
+            .expiration(Date.from(now.plus(jwtProperties.accessTokenExpiration)))
+            .signWith(signingKey())
+            .compact()
+    }
+
+    fun getUserId(token: String): Long = parseClaims(token).subject.toLong()
+
+    private fun parseClaims(token: String): Claims =
+        Jwts
+            .parser()
+            .verifyWith(signingKey())
+            .build()
+            .parseSignedClaims(token)
+            .payload
+
+    private fun signingKey(): SecretKey = Keys.hmacShaKeyFor(Decoders.BASE64.decode(jwtProperties.secret))
+}