Return if the user logged in is a new member

src/main/java/com/und/server/auth/dto/response/AuthResponse.java

@@ -17,5 +17,8 @@ public record AuthResponse(
 	String refreshToken,
 
 	@Schema(description = "Refresh Token expiration time in seconds", example = "604800")
-	Integer refreshTokenExpiresIn
+	Integer refreshTokenExpiresIn,
+
+	@Schema(description = "True if the member is newly registered, false if already registered", example = "true")
+	Boolean isNewMember
 ) { }

src/main/java/com/und/server/auth/service/AuthService.java

@@ -20,7 +20,7 @@
 import com.und.server.common.dto.request.TestAuthRequest;
 import com.und.server.common.exception.ServerException;
 import com.und.server.common.util.ProfileManager;
-import com.und.server.member.entity.Member;
+import com.und.server.member.dto.MemberCreationResult;
 import com.und.server.member.exception.MemberErrorResult;
 import com.und.server.member.service.MemberService;
 
@@ -44,9 +44,9 @@ public class AuthService {
 	public AuthResponse issueTokensForTest(final TestAuthRequest request) {
 		final Provider provider = convertToProvider(request.provider());
 		final String providerId = request.providerId();
-		final Member member = memberService.findOrCreateMember(provider, providerId);
+		final MemberCreationResult result = memberService.findOrCreateMember(provider, providerId);
 
-		return issueTokens(member.getId());
+		return issueTokens(result.member().getId(), result.isNewMember());
 	}
 
 	@Transactional
@@ -66,9 +66,9 @@ public AuthResponse login(final AuthRequest authRequest) {
 
 		verifyIdTokenNonce(provider, idToken);
 		final String providerId = getProviderIdFromIdToken(provider, idToken);
-		final Member member = memberService.findOrCreateMember(provider, providerId);
+		final MemberCreationResult result = memberService.findOrCreateMember(provider, providerId);
 
-		return issueTokens(member.getId());
+		return issueTokens(result.member().getId(), result.isNewMember());
 	}
 
 	@Transactional
@@ -92,7 +92,7 @@ public AuthResponse reissueTokens(final RefreshTokenRequest refreshTokenRequest)
 
 		refreshTokenService.verifyRefreshToken(memberId, providedRefreshToken);
 
-		return issueTokens(memberId);
+		return issueTokens(memberId, false);
 	}
 
 	@Transactional
@@ -120,7 +120,7 @@ private String getProviderIdFromIdToken(final Provider provider, final String id
 		return oidcProviderFactory.getProviderId(provider, idToken, oidcPublicKeys);
 	}
 
-	private AuthResponse issueTokens(final Long memberId) {
+	private AuthResponse issueTokens(final Long memberId, final boolean isNewMember) {
 		final String accessToken = jwtProvider.generateAccessToken(memberId);
 		final String refreshToken = refreshTokenService.generateRefreshToken();
 		refreshTokenService.saveRefreshToken(memberId, refreshToken);
@@ -130,7 +130,8 @@ private AuthResponse issueTokens(final Long memberId) {
 			accessToken,
 			jwtProperties.accessTokenExpireTime(),
 			refreshToken,
-			jwtProperties.refreshTokenExpireTime());
+			jwtProperties.refreshTokenExpireTime(),
+			isNewMember);
 	}
 
 	private Long getMemberIdForReissue(final String accessToken) {

src/main/java/com/und/server/member/dto/MemberCreationResult.java

@@ -0,0 +1,8 @@
+package com.und.server.member.dto;
+
+import com.und.server.member.entity.Member;
+
+public record MemberCreationResult(
+	Member member,
+	boolean isNewMember
+) { }

src/main/java/com/und/server/member/service/MemberService.java

@@ -10,6 +10,7 @@
 import com.und.server.auth.oauth.Provider;
 import com.und.server.auth.service.RefreshTokenService;
 import com.und.server.common.exception.ServerException;
+import com.und.server.member.dto.MemberCreationResult;
 import com.und.server.member.dto.request.NicknameRequest;
 import com.und.server.member.dto.response.MemberResponse;
 import com.und.server.member.entity.Member;
@@ -32,12 +33,13 @@ public List<MemberResponse> getMemberList() {
 	}
 
 	@Transactional
-	public Member findOrCreateMember(final Provider provider, final String providerId) {
+	public MemberCreationResult findOrCreateMember(final Provider provider, final String providerId) {
 		validateProviderIsNotNull(provider);
 		validateProviderIdIsNotNull(providerId);
 
 		return findMemberByProviderId(provider, providerId)
-			.orElseGet(() -> createMember(provider, providerId));
+			.map(member -> new MemberCreationResult(member, false))
+			.orElseGet(() -> new MemberCreationResult(createMember(provider, providerId), true));
 	}
 
 	public Member findMemberById(final Long memberId) {

src/test/java/com/und/server/auth/controller/AuthControllerTest.java

@@ -252,7 +252,8 @@ void Given_ValidKakaoLoginRequest_When_Login_Then_ReturnsOkWithTokens() throws E
 			"dummy.access.token",
 			10000,
 			"dummy.refresh.token",
-			20000
+			20000,
+			true
 		);
 
 		doReturn(authResponse).when(authService).login(authRequest);
@@ -278,6 +279,7 @@ void Given_ValidKakaoLoginRequest_When_Login_Then_ReturnsOkWithTokens() throws E
 		assertThat(response.accessTokenExpiresIn()).isEqualTo(10000);
 		assertThat(response.refreshToken()).isEqualTo("dummy.refresh.token");
 		assertThat(response.refreshTokenExpiresIn()).isEqualTo(20000);
+		assertThat(response.isNewMember()).isTrue();
 	}
 
 	@Test
@@ -291,7 +293,8 @@ void Given_ValidAppleLoginRequest_When_Login_Then_ReturnsOkWithTokens() throws E
 			"dummy.access.token",
 			10000,
 			"dummy.refresh.token",
-			20000
+			20000,
+			true
 		);
 
 		doReturn(authResponse).when(authService).login(authRequest);
@@ -315,6 +318,7 @@ void Given_ValidAppleLoginRequest_When_Login_Then_ReturnsOkWithTokens() throws E
 		assertThat(response.tokenType()).isEqualTo("Bearer");
 		assertThat(response.accessToken()).isEqualTo("dummy.access.token");
 		assertThat(response.refreshToken()).isEqualTo("dummy.refresh.token");
+		assertThat(response.isNewMember()).isTrue();
 	}
 
 	@Test
@@ -372,7 +376,8 @@ void Given_ValidRefreshTokenRequest_When_ReissueTokens_Then_ReturnsCreatedWithNe
 			"new.access.token",
 			10000,
 			"new.refresh.token",
-			7200
+			7200,
+			false
 		);
 
 		doReturn(authResponse).when(authService).reissueTokens(refreshTokenRequest);
@@ -396,6 +401,7 @@ void Given_ValidRefreshTokenRequest_When_ReissueTokens_Then_ReturnsCreatedWithNe
 		assertThat(response.tokenType()).isEqualTo("Bearer");
 		assertThat(response.accessToken()).isEqualTo("new.access.token");
 		assertThat(response.refreshToken()).isEqualTo("new.refresh.token");
+		assertThat(response.isNewMember()).isFalse();
 	}
 
 	@Test