[BE] refactor: KakaoOAuth2Client UserInfo 반환 KakaoOpenIdClient 사용하도록 변경 (#994)

backend/src/main/java/com/festago/auth/application/OAuth2Client.java

@@ -5,9 +5,7 @@
 
 public interface OAuth2Client {
 
-    String getAccessToken(String code);
-
-    UserInfo getUserInfo(String accessToken);
+    UserInfo getUserInfo(String code);
 
     SocialType getSocialType();
 }

backend/src/main/java/com/festago/auth/application/command/MemberAuthFacadeService.java

@@ -28,8 +28,7 @@ public class MemberAuthFacadeService {
 
     public LoginV1Response oAuth2Login(SocialType socialType, String code) {
         OAuth2Client oAuth2Client = oAuth2Clients.getClient(socialType);
-        String oAuth2AccessToken = oAuth2Client.getAccessToken(code);
-        UserInfo userInfo = oAuth2Client.getUserInfo(oAuth2AccessToken);
+        UserInfo userInfo = oAuth2Client.getUserInfo(code);
         return login(userInfo);
     }
 

backend/src/main/java/com/festago/auth/dto/KakaoAccessTokenResponse.java → backend/src/main/java/com/festago/auth/dto/KakaoOAuth2TokenResponse.java

@@ -4,12 +4,9 @@
 import com.fasterxml.jackson.databind.annotation.JsonNaming;
 
 @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
-public record KakaoAccessTokenResponse(
-    String tokenType,
+public record KakaoOAuth2TokenResponse(
     String accessToken,
-    Integer expiresIn,
-    String refreshToken,
-    Integer refreshTokenExpiresIn
+    String idToken
 ) {
 
 }

backend/src/main/java/com/festago/auth/infrastructure/oauth2/FestagoOAuth2Client.java

@@ -7,34 +7,28 @@
 import com.festago.common.exception.ErrorCode;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.function.Supplier;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 
 @Component
 @Profile("!prod")
 public class FestagoOAuth2Client implements OAuth2Client {
 
-    private static final String PROFILE_IMAGE = "https://placehold.co/150x150";
-
-    private final Map<String, Supplier<UserInfo>> userInfoMap = new HashMap<>();
+    private final Map<String, UserInfo> userInfoMap = new HashMap<>();
 
     public FestagoOAuth2Client() {
-        userInfoMap.put("1", () -> new UserInfo("1", getSocialType(), "member1", PROFILE_IMAGE));
-        userInfoMap.put("2", () -> new UserInfo("2", getSocialType(), "member2", PROFILE_IMAGE));
-        userInfoMap.put("3", () -> new UserInfo("3", getSocialType(), "member3", PROFILE_IMAGE));
-    }
-
-    @Override
-    public String getAccessToken(String code) {
-        return code;
+        userInfoMap.put("1", new UserInfo("1", getSocialType(), "member1", null));
+        userInfoMap.put("2", new UserInfo("2", getSocialType(), "member2", null));
+        userInfoMap.put("3", new UserInfo("3", getSocialType(), "member3", null));
     }
 
     @Override
-    public UserInfo getUserInfo(String accessToken) {
-        return userInfoMap.getOrDefault(accessToken, () -> {
+    public UserInfo getUserInfo(String code) {
+        UserInfo userInfo = userInfoMap.get(code);
+        if (userInfo == null) {
             throw new BadRequestException(ErrorCode.OAUTH2_INVALID_TOKEN);
-        }).get();
+        }
+        return userInfo;
     }
 
     @Override

backend/src/main/java/com/festago/auth/infrastructure/oauth2/KakaoOAuth2Client.java

@@ -3,24 +3,21 @@
 import com.festago.auth.application.OAuth2Client;
 import com.festago.auth.domain.SocialType;
 import com.festago.auth.domain.UserInfo;
+import com.festago.auth.infrastructure.openid.KakaoOpenIdClient;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
 
 @Component
 @RequiredArgsConstructor
 public class KakaoOAuth2Client implements OAuth2Client {
 
-    private final KakaoOAuth2AccessTokenClient accessTokenClient;
-    private final KakaoOAuth2UserInfoClient userInfoClient;
+    private final KakaoOAuth2TokenClient kakaoOAuth2TokenClient;
+    private final KakaoOpenIdClient kakaoOpenIdClient;
 
     @Override
-    public String getAccessToken(String code) {
-        return accessTokenClient.getAccessToken(code);
-    }
-
-    @Override
-    public UserInfo getUserInfo(String accessToken) {
-        return userInfoClient.getUserInfo(accessToken);
+    public UserInfo getUserInfo(String code) {
+        String idToken = kakaoOAuth2TokenClient.getIdToken(code);
+        return kakaoOpenIdClient.getUserInfo(idToken);
     }
 
     @Override

backend/src/main/java/com/festago/auth/infrastructure/oauth2/KakaoOAuth2AccessTokenClient.java → backend/src/main/java/com/festago/auth/infrastructure/oauth2/KakaoOAuth2TokenClient.java

@@ -1,6 +1,6 @@
 package com.festago.auth.infrastructure.oauth2;
 
-import com.festago.auth.dto.KakaoAccessTokenResponse;
+import com.festago.auth.dto.KakaoOAuth2TokenResponse;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.http.HttpHeaders;
@@ -9,7 +9,7 @@
 import org.springframework.web.client.RestTemplate;
 
 @Component
-public class KakaoOAuth2AccessTokenClient {
+public class KakaoOAuth2TokenClient {
 
     private static final String URL = "https://kauth.kakao.com/oauth/token";
 
@@ -19,7 +19,7 @@ public class KakaoOAuth2AccessTokenClient {
     private final String redirectUri;
     private final String clientSecret;
 
-    public KakaoOAuth2AccessTokenClient(
+    public KakaoOAuth2TokenClient(
         @Value("${festago.oauth2.kakao.grant-type}") String grantType,
         @Value("${festago.oauth2.kakao.rest-api-key}") String clientId,
         @Value("${festago.oauth2.kakao.redirect-uri}") String redirectUri,
@@ -35,12 +35,13 @@ public KakaoOAuth2AccessTokenClient(
             .build();
     }
 
-    public String getAccessToken(String code) {
-        HttpHeaders headers = getAccessTokenHeaders(code);
-        return requestAccessToken(headers);
+    public String getIdToken(String code) {
+        KakaoOAuth2TokenResponse response = restTemplate.postForEntity(URL, getHeaders(code),
+            KakaoOAuth2TokenResponse.class).getBody();
+        return response.idToken();
     }
 
-    private HttpHeaders getAccessTokenHeaders(String code) {
+    private HttpHeaders getHeaders(String code) {
         HttpHeaders headers = new HttpHeaders();
         headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
         headers.set("grant_type", grantType);
@@ -50,10 +51,4 @@ private HttpHeaders getAccessTokenHeaders(String code) {
         headers.set("code", code);
         return headers;
     }
-
-    private String requestAccessToken(HttpHeaders headers) {
-        KakaoAccessTokenResponse response = restTemplate.postForEntity(URL, headers,
-            KakaoAccessTokenResponse.class).getBody();
-        return response.accessToken();
-    }
 }

backend/src/main/java/com/festago/auth/infrastructure/openid/KakaoOpenIdClient.java

@@ -48,8 +48,6 @@ public UserInfo getUserInfo(String idToken) {
         return UserInfo.builder()
             .socialType(SocialType.KAKAO)
             .socialId(payload.getSubject())
-            .nickname(payload.get("nickname", String.class))
-            .profileImage(payload.get("picture", String.class))
             .build();
     }
 

backend/src/test/java/com/festago/auth/domain/OAuth2ClientsTest.java

@@ -9,9 +9,7 @@
 import com.festago.auth.application.OAuth2Clients;
 import com.festago.auth.application.OAuth2Clients.OAuth2ClientsBuilder;
 import com.festago.auth.infrastructure.oauth2.FestagoOAuth2Client;
-import com.festago.auth.infrastructure.oauth2.KakaoOAuth2AccessTokenClient;
 import com.festago.auth.infrastructure.oauth2.KakaoOAuth2Client;
-import com.festago.auth.infrastructure.oauth2.KakaoOAuth2UserInfoClient;
 import com.festago.common.exception.BadRequestException;
 import com.festago.common.exception.UnexpectedException;
 import org.junit.jupiter.api.DisplayNameGeneration;
@@ -53,10 +51,7 @@ class OAuth2ClientsTest {
     void 여러_타입의_클라이언트가_주어졌을때_타입으로_찾기_성공() {
         // given
         FestagoOAuth2Client festagoOAuth2Client = new FestagoOAuth2Client();
-        KakaoOAuth2Client kakaoOAuth2Client = new KakaoOAuth2Client(
-            mock(KakaoOAuth2AccessTokenClient.class),
-            mock(KakaoOAuth2UserInfoClient.class)
-        );
+        KakaoOAuth2Client kakaoOAuth2Client = new KakaoOAuth2Client(mock(), mock());
 
         OAuth2Clients oAuth2Clients = OAuth2Clients.builder()
             .add(festagoOAuth2Client)

backend/src/test/java/com/festago/auth/infrastructure/KakaoOAuth2AccessTokenClientTest.java → backend/src/test/java/com/festago/auth/infrastructure/KakaoOAuth2TokenClientTest.java

@@ -6,8 +6,8 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.festago.auth.dto.KakaoAccessTokenResponse;
-import com.festago.auth.infrastructure.oauth2.KakaoOAuth2AccessTokenClient;
+import com.festago.auth.dto.KakaoOAuth2TokenResponse;
+import com.festago.auth.infrastructure.oauth2.KakaoOAuth2TokenClient;
 import com.festago.auth.infrastructure.oauth2.KakaoOAuth2AccessTokenErrorHandler.KakaoOAuth2ErrorResponse;
 import com.festago.common.exception.BadRequestException;
 import com.festago.common.exception.ErrorCode;
@@ -24,13 +24,13 @@
 
 @DisplayNameGeneration(ReplaceUnderscores.class)
 @SuppressWarnings("NonAsciiCharacters")
-@RestClientTest(KakaoOAuth2AccessTokenClient.class)
-class KakaoOAuth2AccessTokenClientTest {
+@RestClientTest(KakaoOAuth2TokenClient.class)
+class KakaoOAuth2TokenClientTest {
 
     private static final String URL = "https://kauth.kakao.com/oauth/token";
 
     @Autowired
-    KakaoOAuth2AccessTokenClient kakaoOAuth2AccessTokenClient;
+    KakaoOAuth2TokenClient kakaoOAuth2TokenClient;
 
     @Autowired
     MockRestServiceServer mockServer;
@@ -48,7 +48,7 @@ class KakaoOAuth2AccessTokenClientTest {
                 .body(objectMapper.writeValueAsString(expected)));
 
         // when & then
-        assertThatThrownBy(() -> kakaoOAuth2AccessTokenClient.getAccessToken("code"))
+        assertThatThrownBy(() -> kakaoOAuth2TokenClient.getIdToken("code"))
             .isInstanceOf(BadRequestException.class)
             .hasMessage(ErrorCode.OAUTH2_INVALID_CODE.getMessage());
     }
@@ -63,7 +63,7 @@ class KakaoOAuth2AccessTokenClientTest {
                 .body(objectMapper.writeValueAsString(expected)));
 
         // when & then
-        assertThatThrownBy(() -> kakaoOAuth2AccessTokenClient.getAccessToken("code"))
+        assertThatThrownBy(() -> kakaoOAuth2TokenClient.getIdToken("code"))
             .isInstanceOf(InternalServerException.class)
             .hasMessage(ErrorCode.OAUTH2_INVALID_REQUEST.getMessage());
     }
@@ -76,7 +76,7 @@ class KakaoOAuth2AccessTokenClientTest {
                 .contentType(MediaType.APPLICATION_JSON));
 
         // when & then
-        assertThatThrownBy(() -> kakaoOAuth2AccessTokenClient.getAccessToken("code"))
+        assertThatThrownBy(() -> kakaoOAuth2TokenClient.getIdToken("code"))
             .isInstanceOf(InternalServerException.class)
             .hasMessage(ErrorCode.OAUTH2_INVALID_REQUEST.getMessage());
     }
@@ -89,24 +89,23 @@ class KakaoOAuth2AccessTokenClientTest {
                 .contentType(MediaType.APPLICATION_JSON));
 
         // when & then
-        assertThatThrownBy(() -> kakaoOAuth2AccessTokenClient.getAccessToken("code"))
+        assertThatThrownBy(() -> kakaoOAuth2TokenClient.getIdToken("code"))
             .isInstanceOf(InternalServerException.class)
             .hasMessage(ErrorCode.OAUTH2_PROVIDER_NOT_RESPONSE.getMessage());
     }
 
     @Test
     void 성공() throws JsonProcessingException {
         // given
-        KakaoAccessTokenResponse expected = new KakaoAccessTokenResponse("tokenType", "accessToken",
-            100, "refreshToken", 50);
+        KakaoOAuth2TokenResponse expected = new KakaoOAuth2TokenResponse("accessToken", "idToken");
         mockServer.expect(requestTo(URL))
             .andRespond(MockRestResponseCreators.withSuccess()
                 .contentType(MediaType.APPLICATION_JSON)
                 .body(objectMapper.writeValueAsString(expected)));
         // when
-        String actual = kakaoOAuth2AccessTokenClient.getAccessToken("code");
+        String actual = kakaoOAuth2TokenClient.getIdToken("code");
 
         // then
-        assertThat(actual).isEqualTo(expected.accessToken());
+        assertThat(actual).isEqualTo(expected.idToken());
     }
 }