[KAN-38] 유저 조회 API 개발

src/main/kotlin/com/restaurant/be/common/exception/ServerException.kt

@@ -48,3 +48,7 @@ data class InvalidUserResetPasswordStateException(
 data class NotEqualTokenException(
     override val message: String = "토큰이 일치 하지 않습니다."
 ) : ServerException(400, message)
+
+data class NotFoundUserException(
+    override val message: String = "존재 하지 않는 유저 입니다."
+) : ServerException(400, message)

src/main/kotlin/com/restaurant/be/user/domain/service/GetUserService.kt

@@ -0,0 +1,20 @@
+package com.restaurant.be.user.domain.service
+
+import com.restaurant.be.common.exception.NotFoundUserException
+import com.restaurant.be.user.presentation.dto.GetUserResponse
+import com.restaurant.be.user.repository.UserRepository
+import org.springframework.stereotype.Service
+
+@Service
+class GetUserService(
+    private val userRepository: UserRepository
+) {
+
+    fun getUser(userId: Long): GetUserResponse {
+        val user = userRepository.findById(userId).orElseThrow {
+            NotFoundUserException()
+        }
+
+        return GetUserResponse(user = user)
+    }
+}

src/main/kotlin/com/restaurant/be/user/presentation/controller/GetUserController.kt

@@ -1,6 +1,7 @@
 package com.restaurant.be.user.presentation.controller
 
 import com.restaurant.be.common.response.CommonResponse
+import com.restaurant.be.user.domain.service.GetUserService
 import com.restaurant.be.user.presentation.dto.GetUserResponse
 import io.swagger.annotations.Api
 import io.swagger.annotations.ApiOperation
@@ -16,7 +17,9 @@ import org.springframework.web.bind.annotation.RestController
 @Api(tags = ["01. User Info"], description = "유저 서비스")
 @RestController
 @RequestMapping("/api/v1/users")
-class GetUserController {
+class GetUserController(
+    private val getUserService: GetUserService
+) {
 
     @GetMapping("/{userId}")
     @PreAuthorize("hasRole('USER')")
@@ -26,7 +29,8 @@ class GetUserController {
         description = "성공",
         content = [Content(schema = Schema(implementation = GetUserResponse::class))]
     )
-    fun getUser(@PathVariable userId: String): CommonResponse<GetUserResponse> {
-        return CommonResponse.success()
+    fun getUser(@PathVariable userId: Long): CommonResponse<GetUserResponse> {
+        val response = getUserService.getUser(userId)
+        return CommonResponse.success(response)
     }
 }

src/main/kotlin/com/restaurant/be/user/presentation/dto/GetUserDto.kt

@@ -2,10 +2,20 @@
 
 package com.restaurant.be.user.presentation.dto
 
+import com.restaurant.be.user.domain.entity.User
 import com.restaurant.be.user.presentation.dto.common.UserDto
 import io.swagger.v3.oas.annotations.media.Schema
 
 data class GetUserResponse(
     @Schema(description = "유저 정보")
     val userDto: UserDto
-)
+) {
+    constructor(user: User) : this(
+        userDto = UserDto(
+            id = user.id ?: 0,
+            email = user.email,
+            nickname = user.nickname,
+            profileImageUrl = user.profileImageUrl
+        )
+    )
+}