Add Exception and Handler for handle error and send message for front…

… server

backend/build.gradle

@@ -2,13 +2,13 @@ plugins {
 	id 'java'
 	id 'org.springframework.boot' version '3.2.0'
 	id 'io.spring.dependency-management' version '1.1.4'
+	id 'org.jetbrains.kotlin.jvm'
 }
 
 group = 'kr.co'
 version = '0.0.1-SNAPSHOT'
 
 java {
-	sourceCompatibility = '21'
 }
 
 configurations {
@@ -44,3 +44,6 @@ dependencies {
 tasks.named('test') {
 	useJUnitPlatform()
 }
+kotlin {
+	jvmToolchain(21)
+}

backend/settings.gradle

@@ -1 +1,9 @@
+pluginManagement {
+    plugins {
+        id 'org.jetbrains.kotlin.jvm' version '1.9.21'
+    }
+}
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.5.0'
+}
 rootProject.name = 'yigil'

backend/src/main/java/kr/co/yigil/global/exception/AuthException.java

@@ -0,0 +1,15 @@
+package kr.co.yigil.global.exception;
+
+import lombok.Getter;
+
+@Getter
+public class AuthException extends RuntimeException{
+
+    private final int code;
+    private final String message;
+
+    public AuthException(final ExceptionCode exceptionCode) {
+        this.code = exceptionCode.getCode();
+        this.message = exceptionCode.getMessage();
+    }
+}

backend/src/main/java/kr/co/yigil/global/exception/ExceptionCode.java

@@ -7,7 +7,9 @@
 @Getter
 public enum ExceptionCode {
 
-    INVALID_REQUEST(1000, "올바르지 않은 요청입니다.");
+    INVALID_REQUEST(1000, "올바르지 않은 요청입니다."),
+
+    INVALID_ACCESS_TOKEN(9101, "올바르지 않은 형식의 Access Token입니다.");
 
     private final int code;
     private final String message;

backend/src/main/java/kr/co/yigil/global/exception/ExceptionResponse.java

@@ -0,0 +1,11 @@
+package kr.co.yigil.global.exception;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public class ExceptionResponse {
+    private final int code;
+    private final String message;
+}

backend/src/main/java/kr/co/yigil/global/exception/GlobalExceptionHandler.java

@@ -0,0 +1,41 @@
+package kr.co.yigil.global.exception;
+
+import static kr.co.yigil.global.exception.ExceptionCode.INVALID_REQUEST;
+
+import java.util.Objects;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+@RestControllerAdvice
+@Slf4j
+public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @Override
+    protected ResponseEntity<Object> handleMethodArgumentNotValid(
+            final MethodArgumentNotValidException e,
+            final HttpHeaders headers,
+            final HttpStatusCode status,
+            final WebRequest request
+    ) {
+        log.warn(e.getMessage(), e);
+
+        final String errorMessage = Objects.requireNonNull(e.getBindingResult().getFieldError()).getDefaultMessage();
+        return ResponseEntity.badRequest()
+                .body(new ExceptionResponse(INVALID_REQUEST.getCode(), errorMessage));
+    }
+
+    @ExceptionHandler(AuthException.class)
+    public ResponseEntity<ExceptionResponse> handleAuthException(final AuthException e) {
+        log.warn(e.getMessage(), e);
+
+        return ResponseEntity.badRequest()
+                .body(new ExceptionResponse(e.getCode(), e.getMessage()));
+    }
+}

backend/src/main/java/kr/co/yigil/global/exception/InvalidTokenException.java

@@ -0,0 +1,11 @@
+package kr.co.yigil.global.exception;
+
+import lombok.Getter;
+
+@Getter
+public class InvalidTokenException extends AuthException {
+
+    public InvalidTokenException(final ExceptionCode exceptionCode) {
+        super(exceptionCode);
+    }
+}

backend/src/main/java/kr/co/yigil/login/application/strategy/GoogleLoginStratgy.java

@@ -7,7 +7,7 @@
 public class GoogleLoginStratgy implements LoginStrategy{
 
     @Override
-    public LoginResponse login(LoginRequest request) {
+    public LoginResponse login(LoginRequest request, String accessToken) {
         return new GoogleLoginResponse();
     }
 

backend/src/main/java/kr/co/yigil/login/application/strategy/KakaoLoginStrategy.java

@@ -1,20 +1,40 @@
 package kr.co.yigil.login.application.strategy;
 
+import static kr.co.yigil.global.exception.ExceptionCode.INVALID_ACCESS_TOKEN;
+
+import kr.co.yigil.global.exception.InvalidTokenException;
+import kr.co.yigil.login.dto.request.KakaoLoginRequest;
 import kr.co.yigil.login.dto.request.LoginRequest;
 import kr.co.yigil.login.dto.response.KakaoLoginResponse;
 import kr.co.yigil.login.dto.response.LoginResponse;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.PropertySource;
 
+@PropertySource("classpath:url.properties")
 public class KakaoLoginStrategy implements LoginStrategy {
 
     private final String PROVIDER_NAME = "kakao";
 
+    @Value("${Kakao-Token-Info-Url}")
+    private String KAKAO_TOKEN_INFO_URL;
+
     @Override
-    public LoginResponse login(LoginRequest request) {
+    public LoginResponse login(LoginRequest request, String accessToken) {
+        KakaoLoginRequest loginRequest = (KakaoLoginRequest) request;
+
+        if(!isTokenValid(accessToken)) {
+            throw new InvalidTokenException(INVALID_ACCESS_TOKEN);
+        }
         return new KakaoLoginResponse();
     }
 
     @Override
     public String getProviderName() {
         return PROVIDER_NAME;
     }
+
+    private boolean isTokenValid(String accessToken) {
+        return true;
+    }
+
 }

backend/src/main/java/kr/co/yigil/login/application/strategy/LoginStrategy.java

@@ -4,6 +4,6 @@
 import kr.co.yigil.login.dto.response.LoginResponse;
 
 public interface LoginStrategy {
-    LoginResponse login(LoginRequest request);
+    LoginResponse login(LoginRequest request, String accessToken);
     String getProviderName();
 }

backend/src/main/java/kr/co/yigil/login/presentation/LoginController.java

@@ -1,5 +1,7 @@
 package kr.co.yigil.login.presentation;
 
+import static kr.co.yigil.login.util.LoginUtils.extractToken;
+
 import jakarta.servlet.http.HttpSession;
 import kr.co.yigil.login.application.LoginStrategyManager;
 import kr.co.yigil.login.application.strategy.LoginStrategy;
@@ -25,8 +27,9 @@ public ResponseEntity<LoginResponse> login(
             @RequestHeader("Authorization") String authorizationHeader,
             @RequestBody LoginRequest loginRequest) {
 
+        String accessToken = extractToken(authorizationHeader);
         LoginStrategy strategy = loginStrategyManager.getLoginStrategy(provider);
-        LoginResponse response = strategy.login(loginRequest);
+        LoginResponse response = strategy.login(loginRequest, accessToken);
         return ResponseEntity.ok(response);
     }
 }

backend/src/main/java/kr/co/yigil/login/util/LoginUtils.java

@@ -0,0 +1,10 @@
+package kr.co.yigil.login.util;
+
+public class LoginUtils {
+    public static String extractToken(String authorizationHeader) {
+        if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) {
+            return authorizationHeader.substring(7); // "Bearer " 다음부터가 실제 토큰
+        }
+        return null;
+    }
+}

backend/src/main/resources/url.properties

@@ -0,0 +1 @@
+Kakao-Token-Info-Url=https://kapi.kakao.com/v1/user/access_token_info