feat: 유저 조회 API 개발 (#12)

* feat: 유저 조회 API를 개발한다

* feat: ErrorResponse를 정의한다

gradle/spring.gradle

@@ -13,6 +13,7 @@ allprojects {
     dependencies {
         implementation "org.springframework.boot:spring-boot-starter"
         implementation 'org.springframework.boot:spring-boot-starter-web'
+        implementation "org.springframework.boot:spring-boot-starter-webflux"
         implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
         implementation "org.springframework.boot:spring-boot-starter-actuator"
 

src/main/java/net/teumteum/core/error/ErrorResponse.java

@@ -0,0 +1,19 @@
+package net.teumteum.core.error;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class ErrorResponse {
+
+    private String message;
+
+    public static ErrorResponse of(Throwable exception) {
+        return new ErrorResponse(exception.getMessage());
+    }
+}

src/main/java/net/teumteum/user/controller/UserController.java

@@ -0,0 +1,33 @@
+package net.teumteum.user.controller;
+
+import lombok.RequiredArgsConstructor;
+import net.teumteum.core.error.ErrorResponse;
+import net.teumteum.user.domain.response.UserGetResponse;
+import net.teumteum.user.service.UserService;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/users")
+public class UserController {
+
+    private final UserService userService;
+
+    @GetMapping("/{userId}")
+    @ResponseStatus(HttpStatus.OK)
+    public UserGetResponse getUserById(@PathVariable("userId") Long userId) {
+        return userService.getUserById(userId);
+    }
+
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ErrorResponse handleIllegalArgumentException(IllegalArgumentException illegalArgumentException) {
+        return ErrorResponse.of(illegalArgumentException);
+    }
+}

src/main/java/net/teumteum/user/domain/ActivityArea.java

@@ -4,6 +4,7 @@
 import jakarta.persistence.Column;
 import jakarta.persistence.ElementCollection;
 import jakarta.persistence.Embeddable;
+import jakarta.persistence.FetchType;
 import java.util.ArrayList;
 import java.util.List;
 import lombok.AllArgsConstructor;
@@ -19,6 +20,6 @@ public class ActivityArea {
     @Column(name = "city")
     private String city;
 
-    @ElementCollection
+    @ElementCollection(fetch = FetchType.EAGER)
     private List<String> street = new ArrayList<>();
 }

src/main/java/net/teumteum/user/domain/User.java

@@ -6,6 +6,9 @@
 import jakarta.persistence.Entity;
 import jakarta.persistence.EnumType;
 import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.PrePersist;
 import java.util.ArrayList;
@@ -25,6 +28,7 @@ public class User extends TimeBaseEntity {
 
     @Id
     @Column(name = "id")
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     @Column(name = "name", length = 10)
@@ -59,7 +63,7 @@ public class User extends TimeBaseEntity {
     @Embedded
     private Job job;
 
-    @ElementCollection
+    @ElementCollection(fetch = FetchType.EAGER)
     private List<String> interests = new ArrayList<>();
 
     @Embedded

src/main/java/net/teumteum/user/domain/response/UserGetResponse.java

@@ -0,0 +1,70 @@
+package net.teumteum.user.domain.response;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.List;
+import net.teumteum.user.domain.User;
+
+public record UserGetResponse(
+    Long id,
+    String name,
+    String birth,
+    Long characterId,
+    int mannerTemperature,
+    String authenticated,
+    ActivityArea activityArea,
+    String mbti,
+    String status,
+    String goal,
+    Job job,
+    List<String> interests
+) {
+
+    public static UserGetResponse of(User user) {
+        return new UserGetResponse(
+            user.getId(),
+            user.getName(),
+            user.getBirth(),
+            user.getCharacterId(),
+            user.getMannerTemperature(),
+            user.getOauth().getAuthenticated(),
+            ActivityArea.of(user),
+            user.getMbti(),
+            user.getStatus().name(),
+            user.getGoal(),
+            Job.of(user),
+            user.getInterests()
+        );
+    }
+
+    public record ActivityArea(
+        String city,
+        List<String> streets
+    ) {
+
+        public static ActivityArea of(User user) {
+            return new ActivityArea(
+                user.getActivityArea().getCity(),
+                user.getActivityArea().getStreet()
+            );
+        }
+
+    }
+
+    public record Job(
+        String name,
+        boolean certificated,
+        @JsonProperty("class")
+        String jobClass,
+        String detailClass
+    ) {
+
+        public static Job of(User user) {
+            return new Job(
+                user.getJob().getName(),
+                user.getJob().isCertificated(),
+                user.getJob().getJobClass(),
+                user.getJob().getDetailJobClass()
+            );
+        }
+    }
+}

src/main/java/net/teumteum/user/service/UserService.java

@@ -0,0 +1,23 @@
+package net.teumteum.user.service;
+
+import lombok.RequiredArgsConstructor;
+import net.teumteum.user.domain.UserRepository;
+import net.teumteum.user.domain.response.UserGetResponse;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class UserService {
+
+    private final UserRepository userRepository;
+
+    public UserGetResponse getUserById(Long userId) {
+        var existUser = userRepository.findById(userId)
+            .orElseThrow(() -> new IllegalArgumentException("userId에 해당하는 user를 찾을 수 없습니다. \"" + userId + "\""));
+
+        return UserGetResponse.of(existUser);
+    }
+
+}

src/test/java/net/teumteum/user/domain/UserFixture.java

@@ -5,6 +5,12 @@
 
 public class UserFixture {
 
+    public static User getNullIdUser() {
+        return newUserByBuilder(UserBuilder.builder()
+            .id(null)
+            .build());
+    }
+
     public static User getUserWithId(Long id) {
         return newUserByBuilder(UserBuilder.builder()
             .id(id)

src/test/java/net/teumteum/user/integration/Api.java

@@ -0,0 +1,27 @@
+package net.teumteum.user.integration;
+
+import org.springframework.boot.test.context.TestComponent;
+import org.springframework.context.ApplicationContext;
+import org.springframework.http.HttpHeaders;
+import org.springframework.stereotype.Controller;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.test.web.reactive.server.WebTestClient.ResponseSpec;
+
+@TestComponent
+class Api {
+
+    private final WebTestClient webTestClient;
+
+    public Api(ApplicationContext applicationContext) {
+        var controllers = applicationContext.getBeansWithAnnotation(Controller.class).values();
+        webTestClient = WebTestClient.bindToController(controllers.toArray()).build();
+    }
+
+    ResponseSpec getUser(String token, Long userId) {
+        return webTestClient.get()
+            .uri("/users/" + userId)
+            .header(HttpHeaders.AUTHORIZATION, token)
+            .exchange();
+    }
+
+}

src/test/java/net/teumteum/user/integration/IntegrationTest.java

@@ -0,0 +1,19 @@
+package net.teumteum.user.integration;
+
+import net.teumteum.Application;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.test.context.ContextConfiguration;
+
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@ContextConfiguration(classes = {Application.class, Api.class, Repository.class})
+abstract class IntegrationTest {
+
+    @Autowired
+    protected Api api;
+
+    @Autowired
+    protected Repository repository;
+
+}

src/test/java/net/teumteum/user/integration/Repository.java

@@ -0,0 +1,24 @@
+package net.teumteum.user.integration;
+
+import lombok.RequiredArgsConstructor;
+import net.teumteum.user.domain.User;
+import net.teumteum.user.domain.UserFixture;
+import net.teumteum.user.domain.UserRepository;
+import org.springframework.boot.test.context.TestComponent;
+
+@TestComponent
+@RequiredArgsConstructor
+class Repository {
+
+    private final UserRepository userRepository;
+
+    User saveAndGetUser() {
+        var user = UserFixture.getNullIdUser();
+        return userRepository.saveAndFlush(user);
+    }
+
+    void clear() {
+        userRepository.deleteAll();
+    }
+
+}

src/test/java/net/teumteum/user/integration/UserIntegrationTest.java

@@ -0,0 +1,61 @@
+package net.teumteum.user.integration;
+
+import net.teumteum.core.error.ErrorResponse;
+import net.teumteum.user.domain.response.UserGetResponse;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+@DisplayName("유저 통합테스트의")
+class UserIntegrationTest extends IntegrationTest {
+
+    private static final String VALID_TOKEN = "VALID_TOKEN";
+    private static final String INVALID_TOKEN = "IN_VALID_TOKEN";
+
+    @AfterEach
+    @BeforeEach
+    void clearAll() {
+        repository.clear();
+    }
+
+    @Nested
+    @DisplayName("유저 조회 API는")
+    class Find_user_api {
+
+        @Test
+        @DisplayName("존재하는 유저의 id가 주어지면, 유저 정보를 응답한다.")
+        void Return_user_info_if_exist_user_id_received() {
+            // given
+            var user = repository.saveAndGetUser();
+            var expected = UserGetResponse.of(user);
+
+            // when
+            var result = api.getUser(VALID_TOKEN, user.getId());
+
+            // then
+            Assertions.assertThat(
+                    result.expectStatus().isOk()
+                        .expectBody(UserGetResponse.class)
+                        .returnResult().getResponseBody())
+                .usingRecursiveComparison()
+                .isEqualTo(expected);
+        }
+
+        @Test
+        @DisplayName("존재하지 않는 유저의 id가 주어지면, 400 Bad Request를 응답한다.")
+        void Return_400_bad_request_if_not_exists_user_id_received() {
+            // given
+            var notExistUserId = 1L;
+
+            // when
+            var result = api.getUser(VALID_TOKEN, notExistUserId);
+
+            // then
+            result.expectStatus().isBadRequest()
+                .expectBody(ErrorResponse.class);
+        }
+    }
+}