Feat: 구글 로그인 구현

Author: joyewon0705

src/main/java/com/back/global/security/oauth/CustomOAuth2UserService.java

@@ -44,6 +44,7 @@ public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2Authentic
             OAuth2UserInfo userInfo = switch (registrationId) {
                 case "kakao" -> new KakaoOAuth2UserInfo(attributes);
                 case "naver" -> new NaverOAuth2UserInfo(attributes);
+                case "google" -> new GoogleOAuth2UserInfo(attributes);
                 default -> throw new CustomException(ErrorCode.UNSUPPORTED_OAUTH_PROVIDER);
             };
 

src/main/java/com/back/global/security/oauth/GoogleOAuth2UserInfo.java

@@ -0,0 +1,39 @@
+package com.back.global.security.oauth;
+
+import java.util.Map;
+
+/**
+ * 구글 OAuth2 사용자 정보 구현체
+ */
+public class GoogleOAuth2UserInfo implements OAuth2UserInfo {
+    private final Map<String, Object> attributes;
+
+    public GoogleOAuth2UserInfo(Map<String, Object> attributes) {
+        this.attributes = attributes;
+    }
+
+    @Override
+    public String getProvider() {
+        return "google";
+    }
+
+    @Override
+    public String getProviderId() {
+        return (String) attributes.get("sub"); // 구글은 sub가 고유 ID
+    }
+
+    @Override
+    public String getEmail() {
+        return (String) attributes.get("email");
+    }
+
+    @Override
+    public String getNickname() {
+        return (String) attributes.get("name");
+    }
+
+    @Override
+    public String getProfileImageUrl() {
+        return (String) attributes.getOrDefault("picture", null);
+    }
+}

src/main/resources/application-dev.yml

@@ -31,16 +31,25 @@ spring:
           kakao:
             client-id: ${KAKAO_CLIENT_ID}
             authorization-grant-type: authorization_code
+            client-name: Kakao
             redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
             scope: profile_nickname, profile_image, account_email
-            client-name: Kakao
           naver:
             client-id: ${NAVER_CLIENT_ID}
             client-secret: ${NAVER_CLIENT_SECRET}
+            client-name: Naver
             authorization-grant-type: authorization_code
             redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
             scope: email, nickname, profile_image
-            client-name: Naver
+          google:
+            client-id: ${GOOGLE_CLIENT_ID}
+            client-secret: ${GOOGLE_CLIENT_SECRET}
+            client-name: Google
+            authorization-grant-type: authorization_code
+            redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
+            scope:
+              - email
+              - profile
         provider:
           kakao:
             authorization-uri: https://kauth.kakao.com/oauth/authorize
@@ -52,6 +61,11 @@ spring:
             token-uri: https://nid.naver.com/oauth2.0/token
             user-info-uri: https://openapi.naver.com/v1/nid/me
             user-name-attribute: response
+          google:
+            authorization-uri: https://accounts.google.com/o/oauth2/v2/auth
+            token-uri: https://oauth2.googleapis.com/token
+            user-info-uri: https://www.googleapis.com/oauth2/v3/userinfo
+            user-name-attribute: sub
 
 springdoc:
   default-produces-media-type: application/json;charset=UTF-8