소셜로그인 구현

src/main/java/kimandhong/oxox/controller/UserController.java

@@ -8,6 +8,7 @@
 import kimandhong.oxox.domain.User;
 import kimandhong.oxox.dto.user.JoinDto;
 import kimandhong.oxox.dto.user.LoginDto;
+import kimandhong.oxox.dto.user.SocialLoginDto;
 import kimandhong.oxox.dto.user.UserDto;
 import kimandhong.oxox.service.UserService;
 import lombok.RequiredArgsConstructor;
@@ -46,4 +47,16 @@ public ResponseEntity<UserDto> login(@RequestBody @Valid final LoginDto loginDto
         .header("Access-Control-Expose-Headers", "X-Access-Token")
         .body(UserDto.from(user));
   }
+
+  @PostMapping("login/social")
+  @SwaggerCreated(summary = "소셜로그인")
+  public ResponseEntity<UserDto> socialLogin(@RequestBody @Valid final SocialLoginDto loginDto) {
+    final User user = userService.socialLogin(loginDto);
+    final String token = jwtUtil.createAccessToken(user);
+
+    return ResponseEntity.status(HttpStatus.OK)
+        .header("X-Access-Token", token)
+        .header("Access-Control-Expose-Headers", "X-Access-Token")
+        .body(UserDto.from(user));
+  }
 }

src/main/java/kimandhong/oxox/domain/Profile.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
 import kimandhong.oxox.dto.user.JoinDto;
+import kimandhong.oxox.dto.user.SocialLoginDto;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
@@ -40,6 +41,15 @@ public static Profile from(final JoinDto joinDto, final User user, final Long se
         .build();
   }
 
+  public static Profile from(final SocialLoginDto loginDto, final Long sequence, final User user) {
+    return Profile.builder()
+        .nickname(loginDto.displayName())
+        .sequence(sequence)
+        .image(loginDto.photoUrl())
+        .user(user)
+        .build();
+  }
+
   public void updateProfile(final String nickname, final Long sequence, final String image) {
     this.image = image;
     this.nickname = nickname;

src/main/java/kimandhong/oxox/domain/User.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
 import kimandhong.oxox.dto.user.JoinDto;
+import kimandhong.oxox.dto.user.SocialLoginDto;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
@@ -24,7 +25,6 @@ public class User extends TimeEntity {
   @Column(nullable = false)
   private String email;
 
-  @Column(nullable = false)
   private String password;
   private String uid;
 
@@ -50,7 +50,17 @@ private User(final JoinDto joinDto, final String password, final Long sequence,
     this.profile = Profile.from(joinDto, this, sequence, profileImage);
   }
 
+  private User(final SocialLoginDto loginDto, final Long sequence) {
+    this.email = loginDto.email();
+    this.uid = loginDto.uid();
+    this.profile = Profile.from(loginDto, sequence, this);
+  }
+
   public static User from(final JoinDto joinDto, final String password, final Long sequence, final String profileImage) {
     return new User(joinDto, password, sequence, profileImage);
   }
+
+  public static User from(final SocialLoginDto loginDto, final Long sequence) {
+    return new User(loginDto, sequence);
+  }
 }

src/main/java/kimandhong/oxox/dto/user/SocialLoginDto.java

@@ -0,0 +1,9 @@
+package kimandhong.oxox.dto.user;
+
+public record SocialLoginDto(
+    String email,
+    String displayName,
+    String photoUrl,
+    String uid
+) {
+}

src/main/java/kimandhong/oxox/repository/UserRepository.java

@@ -14,4 +14,6 @@ public interface UserRepository extends JpaRepository<User, Long> {
 
   @EntityGraph(attributePaths = "profile")
   List<User> findAll();
+
+  Optional<User> findByUid(final String uid);
 }

src/main/java/kimandhong/oxox/service/UserService.java

@@ -4,6 +4,7 @@
 import kimandhong.oxox.domain.User;
 import kimandhong.oxox.dto.user.JoinDto;
 import kimandhong.oxox.dto.user.LoginDto;
+import kimandhong.oxox.dto.user.SocialLoginDto;
 import kimandhong.oxox.handler.error.ErrorCode;
 import kimandhong.oxox.handler.error.exception.ConflictException;
 import kimandhong.oxox.handler.error.exception.NotFoundException;
@@ -51,4 +52,12 @@ public User login(final LoginDto loginDto) {
         .filter(foundUser -> passwordEncoder.matches(loginDto.password(), foundUser.getPassword()))
         .orElseThrow(() -> new NotFoundException(ErrorCode.BAD_REQUEST_LOGIN));
   }
+
+  public User socialLogin(final SocialLoginDto loginDto) {
+    return userRepository.findByUid(loginDto.uid()).orElseGet(() -> {
+      final Long sequence = profileCustomRepository.findMaxSequenceByNickname(loginDto.displayName()) + 1;
+      final User user = User.from(loginDto, sequence);
+      return userRepository.save(user);
+    });
+  }
 }

src/main/resources/db/migration/V5__change_user_password_able_null.sql

@@ -0,0 +1,2 @@
+ALTER TABLE users
+MODIFY COLUMN password VARCHAR(255) NULL;