fix : 구글 소셜 로그인 문제되었던 부분들 수정 #13 (#14)

Author: minhyuk2

src/main/java/com/backend/crame/domain/google/controller/GoogleController.java

@@ -15,7 +15,7 @@
 import reactor.core.publisher.Mono;
 
 @RestController
-@RequestMapping("/api/v1/google")
+@RequestMapping("/api/v1/auth/google")
 @Tag(name = "구글 로그인 API", description = "구글 로그인 관련 API입니다.")
 @RequiredArgsConstructor
 public class GoogleController {

src/main/java/com/backend/crame/domain/google/service/GoogleOAuthService.java

@@ -8,7 +8,12 @@
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.MediaType;
 import org.springframework.stereotype.Service;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.reactive.function.BodyInserters;
 import org.springframework.web.reactive.function.client.WebClient;
 
 import com.backend.crame.domain.user.entitiy.Domain;
@@ -57,24 +62,25 @@ private Mono<String> exchangeCodeForAccessToken(String code) {
 
 		return webClient.post()
 			.uri("https://oauth2.googleapis.com/token")
-			.bodyValue(Map.of(
-				"code", decodedCode,
-				"client_id", clientId,
-				"client_secret", clientSecret,
-				"redirect_uri", redirectUri,
-				"grant_type", "authorization_code"
-			))
+			.contentType(MediaType.APPLICATION_FORM_URLENCODED)
+			.body(BodyInserters.fromFormData("grant_type", "authorization_code")
+				.with("client_id", clientId)
+				.with("client_secret", clientSecret)
+				.with("redirect_uri", redirectUri)
+				.with("code", decodedCode))
 			.retrieve()
-			.bodyToMono(new ParameterizedTypeReference<Map<String, Object>>() {})
+			.bodyToMono(Map.class)
 			.map(body -> {
-				if (!body.containsKey("access_token")) {
-					throw new BaseException(ErrorCode.LOGIN_FAIL);
+				String token = (String)body.get("access_token");
+				if (token == null) {
+					throw new BaseException(ErrorCode.GOOGLE_LOGIN_FAIL);
 				}
-				return (String) body.get("access_token");
-			});
-
+				return token;
+			})
+			.onErrorMap(e -> new BaseException(ErrorCode.GOOGLE_LOGIN_FAIL));
 	}
 
+
 	private Mono<Map<String, Object>> fetchUserInfo(String accessToken) {
 		return webClient.get()
 			.uri("https://www.googleapis.com/oauth2/v3/userinfo")

src/main/java/com/backend/crame/domain/user/utils/BirthdateParser.java

@@ -10,7 +10,7 @@ public static LocalDate parseToLocalDate(String input) {
 		// 숫자만 추출
 		String digits = input.replaceAll("\\D", "");
 		if (digits.length() < 7) {
-			throw new IllegalArgumentException("형식 오류: 최소 7자리(YYMMDD + 코드)가 필요합니다.");
+			throw new IllegalArgumentException("형식 오류: 최소 7자리(YYMMDD + 뒷자리 한자리)가 필요합니다.");
 		}
 
 		String yymmdd = digits.substring(0, 6);

src/main/java/com/backend/crame/global/exception/ErrorCode.java

@@ -14,7 +14,7 @@
 @Getter
 public enum ErrorCode {
 
-
+	GOOGLE_LOGIN_FAIL(BAD_REQUEST,404,"구글 로그인에 실패하였습니다."),
 	LOGIN_FAIL(HttpStatus.BAD_REQUEST,400,"로그인에 오류가 발생하였습니다."),
 	INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR,500,"서버에 오류가 발생하였습니다."),
 	JWT_KEY_GENERATION_FAILED(HttpStatus.BAD_REQUEST,400,"JWT 키 생성에 실패하였습니다."),