로그 기능 추가

src/main/java/com/recyclestudy/common/log/ApiLogFilter.java

@@ -0,0 +1,96 @@
+package com.recyclestudy.common.log;
+
+import jakarta.servlet.Filter;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.Optional;
+import java.util.UUID;
+import lombok.extern.slf4j.Slf4j;
+import org.slf4j.MDC;
+import org.springframework.stereotype.Component;
+
+import static com.recyclestudy.common.log.MDCKey.CLIENT_IP;
+import static com.recyclestudy.common.log.MDCKey.HOST;
+import static com.recyclestudy.common.log.MDCKey.HTTP_METHOD;
+import static com.recyclestudy.common.log.MDCKey.QUERY_STRING;
+import static com.recyclestudy.common.log.MDCKey.REQUEST_URI;
+import static com.recyclestudy.common.log.MDCKey.TRACE_ID;
+import static com.recyclestudy.common.log.MDCKey.USER_AGENT;
+
+@Slf4j
+@Component
+public class ApiLogFilter implements Filter {
+
+    private static final String REQUEST_ID_HEADER = "X-Request-Id";
+
+    @Override
+    public void doFilter(
+            final ServletRequest servletRequest,
+            final ServletResponse servletResponse,
+            final FilterChain filterChain
+    ) throws IOException, ServletException {
+        final HttpServletRequest request = (HttpServletRequest) servletRequest;
+        final HttpServletResponse response = (HttpServletResponse) servletResponse;
+
+        final String traceId = Optional.ofNullable(request.getHeader(REQUEST_ID_HEADER))
+                .filter(header -> !header.isBlank())
+                .orElseGet(this::generateTraceId);
+
+        populateMDC(traceId, request);
+        response.setHeader(REQUEST_ID_HEADER, traceId);
+
+        final long startTime = System.currentTimeMillis();
+        logRequest(request);
+
+        int statusForLog = 200;
+        try {
+            filterChain.doFilter(servletRequest, servletResponse);
+            statusForLog = response.getStatus();
+        } catch (final Exception ex) {
+            statusForLog = 500;
+            throw ex;
+        } finally {
+            logResponse(response, startTime, statusForLog);
+            MDC.clear();
+        }
+    }
+
+    private void logRequest(final HttpServletRequest request) {
+        final String uri = request.getRequestURI();
+        final String method = request.getMethod();
+        final String ip = request.getRemoteAddr();
+
+        final String queryString = request.getQueryString();
+        final String userAgentHeader = request.getHeader("User-Agent");
+        final String query = (queryString != null ? "?" + queryString : "");
+        final String userAgent = (userAgentHeader != null ? userAgentHeader : "-");
+
+        log.info("[REQ] layer=filter | ip={} | method={} | uri={}{} | userAgent={}", ip, method, uri, query, userAgent);
+    }
+
+    private void logResponse(final HttpServletResponse response, final long startTime, final int status) {
+        final long duration = System.currentTimeMillis() - startTime;
+        final String contentType = Optional.ofNullable(response.getContentType()).orElse("-");
+
+        log.info("[RES] layer=filter | status={} | duration={}ms | contentType={}", status, duration, contentType);
+    }
+
+    private String generateTraceId() {
+        return UUID.randomUUID().toString().substring(0, 8);
+    }
+
+    private void populateMDC(final String traceId, final HttpServletRequest request) {
+        MDC.put(TRACE_ID.getKey(), traceId);
+        MDC.put(HOST.getKey(), request.getHeader("host"));
+        MDC.put(HTTP_METHOD.getKey(), request.getMethod());
+        MDC.put(REQUEST_URI.getKey(), request.getRequestURI());
+        MDC.put(QUERY_STRING.getKey(), request.getQueryString());
+        MDC.put(CLIENT_IP.getKey(), request.getRemoteAddr());
+        MDC.put(USER_AGENT.getKey(), request.getHeader("User-Agent"));
+    }
+}

src/main/java/com/recyclestudy/common/log/ControllerLoggingAspect.java

@@ -0,0 +1,88 @@
+package com.recyclestudy.common.log;
+
+import jakarta.servlet.http.HttpServletRequest;
+import java.util.Arrays;
+import java.util.Optional;
+import lombok.extern.slf4j.Slf4j;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+import org.aspectj.lang.reflect.MethodSignature;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+@Aspect
+@Component
+@Slf4j
+public class ControllerLoggingAspect {
+
+    private static final int MAX_LOG_LENGTH = 500;
+
+    @Pointcut("execution(* com.recyclestudy..controller..*(..))")
+    public void controllerMethods() {
+    }
+
+    @Around("controllerMethods()")
+    public Object logController(final ProceedingJoinPoint joinPoint) throws Throwable {
+        final MethodSignature signature = (MethodSignature) joinPoint.getSignature();
+        final String className = signature.getDeclaringType().getSimpleName();
+        final String methodName = signature.getName();
+        final Object[] args = joinPoint.getArgs();
+
+        final HttpServletRequest request = getCurrentHttpRequest();
+        final String httpMethod = request != null ? request.getMethod() : "N/A";
+        final String uri = request != null ? request.getRequestURI() : "N/A";
+
+        final long startTime = System.currentTimeMillis();
+        logRequest(className, methodName, httpMethod, uri, args);
+
+        final Object result = joinPoint.proceed();
+        logResponse(className, methodName, httpMethod, uri, result, startTime);
+
+        return result;
+    }
+
+    private void logRequest(
+            final String className,
+            final String methodName,
+            final String httpMethod,
+            final String uri,
+            final Object[] args
+    ) {
+        log.info("[REQ] layer=controller | method={}.{} | httpMethod={} | uri={} | args={}",
+                className, methodName, httpMethod, uri, Arrays.toString(args));
+    }
+
+    private void logResponse(
+            final String className,
+            final String methodName,
+            final String httpMethod,
+            final String uri,
+            final Object result,
+            final long startTime
+    ) {
+        final long duration = System.currentTimeMillis() - startTime;
+        final String resultStr = formatResult(result);
+
+        log.info("[RES] layer=controller | method={}.{} | httpMethod={} | uri={} | duration={}ms | result={}",
+                className, methodName, httpMethod, uri, duration, resultStr);
+    }
+
+    private HttpServletRequest getCurrentHttpRequest() {
+        return Optional.ofNullable(RequestContextHolder.getRequestAttributes())
+                .filter(ServletRequestAttributes.class::isInstance)
+                .map(ServletRequestAttributes.class::cast)
+                .map(ServletRequestAttributes::getRequest)
+                .orElse(null);
+    }
+
+    private String formatResult(final Object result) {
+        if (result == null) {
+            return "null";
+        }
+        final String resultStr = result.toString();
+        return resultStr.length() <= MAX_LOG_LENGTH ? resultStr : resultStr.substring(0, MAX_LOG_LENGTH) + "...";
+    }
+}

src/main/java/com/recyclestudy/common/log/MDCKey.java

@@ -0,0 +1,20 @@
+package com.recyclestudy.common.log;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum MDCKey {
+
+    TRACE_ID("traceId"),
+    HOST("host"),
+    HTTP_METHOD("httpMethod"),
+    REQUEST_URI("requestUri"),
+    QUERY_STRING("queryString"),
+    CLIENT_IP("clientIp"),
+    USER_AGENT("userAgent");
+
+    private final String key;
+}
+

src/main/java/com/recyclestudy/email/DeviceAuthEmailSender.java

@@ -1,5 +1,7 @@
 package com.recyclestudy.email;
 
+import com.recyclestudy.member.domain.DeviceIdentifier;
+import com.recyclestudy.member.domain.Email;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
@@ -20,17 +22,18 @@ public class DeviceAuthEmailSender {
     private String baseUrl;
 
     @Async
-    public void sendDeviceAuthMail(final String email, final String deviceId) {
-        final String authUrl = createAuthUrl(email, deviceId);
+    public void sendDeviceAuthMail(final Email email, final DeviceIdentifier deviceIdentifier) {
+        final String authUrl = createAuthUrl(email, deviceIdentifier);
         final String message = createMessage(authUrl);
 
         emailSender.send(email, "[Recycle Study] 디바이스 인증을 완료해주세요.", message);
 
-        log.info("인증 메일 발송 성공: {}", email);
+        log.info("[AUTH_MAIL_SENT] 인증 메일 발송 성공: {}", email);
     }
 
-    private String createAuthUrl(final String email, final String deviceId) {
-        return String.format("%s/api/v1/device/auth?email=%s&identifier=%s", baseUrl, email, deviceId);
+    private String createAuthUrl(final Email email, final DeviceIdentifier deviceIdentifier) {
+        return String.format("%s/api/v1/device/auth?email=%s&identifier=%s",
+                baseUrl, email.getValue(), deviceIdentifier.getValue());
     }
 
     private String createMessage(final String authUrl) {

src/main/java/com/recyclestudy/email/EmailSender.java

@@ -1,6 +1,7 @@
 package com.recyclestudy.email;
 
 import com.recyclestudy.exception.EmailSendException;
+import com.recyclestudy.member.domain.Email;
 import jakarta.mail.MessagingException;
 import jakarta.mail.internet.MimeMessage;
 import lombok.RequiredArgsConstructor;
@@ -16,21 +17,21 @@ public class EmailSender {
 
     private final JavaMailSender javaMailSender;
 
-    public void send(final String targetEmail, final String subject, final String content) {
+    public void send(final Email targetEmail, final String subject, final String content) {
         try {
             final MimeMessage mimeMessage = javaMailSender.createMimeMessage();
             final MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, false, "UTF-8");
 
-            helper.setTo(targetEmail);
+            helper.setTo(targetEmail.getValue());
             helper.setSubject(subject);
             helper.setText(content, true);
 
             javaMailSender.send(mimeMessage);
 
-            log.info("메일 발송 성공: email={}", targetEmail);
+            log.info("[MAIL_SENT] 메일 발송 성공: email={}", targetEmail.toMaskedValue());
 
         } catch (MessagingException e) {
-            log.error("메일 발송 실패: email={}", targetEmail, e);
+            log.error("[MAIL_SEND_FAILED] 메일 발송 실패: email={}", targetEmail, e);
             throw new EmailSendException("메일 전송 중 오류가 발생했습니다.", e);
         }
     }

src/main/java/com/recyclestudy/email/ReviewEmailSender.java

@@ -40,7 +40,7 @@ public void sendReviewMail() {
                 ReviewSendInput.from(targetDate, targetTime));
 
         final List<ReviewSendElement> elements = targetReviewCycle.elements();
-        log.info("복습 메일 발송 시작: 대상 {}명", elements.size());
+        log.info("[REVIEW_MAIL_SENT] 복습 메일 발송 시작: date={}, time={}, size={}", targetDate, targetTime, elements.size());
 
         int successCount = 0;
         int failCount = 0;
@@ -60,14 +60,15 @@ public void sendReviewMail() {
             }
         }
 
-        log.info("복습 메일 발송 처리 완료: 성공 {}명, 실패 {}명", successCount, failCount);
+        log.info("[REVIEW_MAIL_SENT] 복습 메일 발송 처리 완료: success={}, fail={}", successCount, failCount);
     }
 
     private boolean sendToTargetEmail(final Email targetEmail, final String message) {
         try {
-            emailSender.send(targetEmail.getValue(), "[Recycle Study] 오늘의 복습 목록이 도착했습니다", message);
+            emailSender.send(targetEmail, "[Recycle Study] 오늘의 복습 목록이 도착했습니다", message);
             return true;
         } catch (final Exception e) {
+            log.error("[REVIEW_MAIL_SEND_FAILED] 복습 메일 발송 실패: email={}", targetEmail.getValue(), e);
             return false;
         }
     }

src/main/java/com/recyclestudy/exception/GlobalControllerAdvice.java

@@ -1,54 +1,63 @@
 package com.recyclestudy.exception;
 
 import com.recyclestudy.exception.dto.ErrorResponse;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.MissingServletRequestParameterException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
+@Slf4j
 @RestControllerAdvice
 public class GlobalControllerAdvice {
 
     @ExceptionHandler(NotFoundException.class)
     public ResponseEntity<ErrorResponse> handleNotFound(final NotFoundException e) {
+        log.warn("[NOT_FOUND] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response);
     }
 
     @ExceptionHandler(BadRequestException.class)
     public ResponseEntity<ErrorResponse> handleBadRequest(final BadRequestException e) {
+        log.warn("[BAD_REQUEST] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
     }
 
     @ExceptionHandler(DeviceActivationExpiredException.class)
     public ResponseEntity<ErrorResponse> handleDeviceActivationExpired(final DeviceActivationExpiredException e) {
+        log.warn("[DEVICE_ACTIVATION_EXPIRED] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
     }
 
     @ExceptionHandler(UnauthorizedException.class)
     public ResponseEntity<ErrorResponse> handleUnauthorized(final UnauthorizedException e) {
+        log.warn("[UNAUTHORIZED] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(response);
     }
 
     @ExceptionHandler(IllegalArgumentException.class)
     public ResponseEntity<ErrorResponse> handleIllegalArgument(final IllegalArgumentException e) {
+        log.warn("[ILLEGAL_ARGUMENT] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
     }
 
     @ExceptionHandler(MissingServletRequestParameterException.class)
     public ResponseEntity<ErrorResponse> handleMissingServletRequestParameter(
             final MissingServletRequestParameterException e) {
+        log.warn("[MISSING_PARAMETER] {}", e.getMessage());
         final ErrorResponse response = ErrorResponse.from(e.getMessage());
         return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
     }
 
     @ExceptionHandler(Exception.class)
     public ResponseEntity<ErrorResponse> handleException(final Exception e) {
+        log.error("[INTERNAL_ERROR] 예기치 못한 에러 발생", e);
         final ErrorResponse response = ErrorResponse.from("예기치 못한 에러가 발생했습니다");
         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(response);
     }

src/main/java/com/recyclestudy/member/controller/MemberController.java

@@ -32,7 +32,7 @@ public ResponseEntity<MemberSaveResponse> saveMember(@RequestBody final MemberSa
         final MemberSaveInput input = request.toInput();
         final MemberSaveOutput output = memberService.saveDevice(input);
 
-        deviceAuthEmailSender.sendDeviceAuthMail(output.email().getValue(), output.identifier().getValue());
+        deviceAuthEmailSender.sendDeviceAuthMail(output.email(), output.identifier());
 
         final MemberSaveResponse response = MemberSaveResponse.from(output);
         return ResponseEntity.status(HttpStatus.CREATED).body(response);

src/main/java/com/recyclestudy/member/domain/Email.java

@@ -42,4 +42,24 @@ private static void validateEmailFormat(final String emailValue) {
             throw new IllegalArgumentException("유효하지 않은 이메일 형식입니다.");
         }
     }
+
+    public String toMaskedValue() {
+        final String[] split = value.split("@");
+        final String maskedLocalPart = maskLocalPart(split[0]);
+        return maskedLocalPart + "@" + split[1];
+    }
+
+    private String maskLocalPart(final String localPart) {
+        int length = localPart.length();
+
+        if (length <= 2) {
+            return localPart.charAt(0) + "*";
+        }
+
+        int visibleLength = Math.min(3, length / 2);
+        String visiblePart = localPart.substring(0, visibleLength);
+        String maskedPart = "*".repeat(length - visibleLength);
+
+        return visiblePart + maskedPart;
+    }
 }