[refactor] 로그인/회원가입 구현 관련 리팩토링 진행

src/main/java/com/wayble/server/common/config/security/jwt/JwtAuthentication.java

@@ -5,14 +5,15 @@
 import java.util.List;
 
 public class JwtAuthentication extends AbstractAuthenticationToken {
-    private final String email;
+    private final Long userId;
 
-    public JwtAuthentication(String email) {
+
+    public JwtAuthentication(Long userId) {
         super(List.of(new SimpleGrantedAuthority("ROLE_USER")));
-        this.email = email;
+        this.userId = userId;
         setAuthenticated(true);
     }
 
     @Override public Object getCredentials() { return ""; }
-    @Override public Object getPrincipal() { return email; }
+    @Override public Object getPrincipal() {  return userId; }
 }

src/main/java/com/wayble/server/common/config/security/jwt/JwtAuthenticationFilter.java

@@ -26,10 +26,16 @@ protected void doFilterInternal(HttpServletRequest req,
             String token = header.substring(7);
 
             if (jwtProvider.validateToken(token)) {
-                String email = jwtProvider.getEmail(token);
-                var authentication = new JwtAuthentication(email);
+                Long userId = jwtProvider.getUserId(token);
+                var authentication = new JwtAuthentication(userId);
                 SecurityContextHolder.getContext().setAuthentication(authentication);
+            } else {
+                // 토큰이 유효하지 않으면 Context 클리어
+                SecurityContextHolder.clearContext();
             }
+        } else {
+            // Authorization 헤더가 아예 없을 때도 Context 클리어
+            SecurityContextHolder.clearContext();
         }
 
         chain.doFilter(req, res);

src/main/java/com/wayble/server/common/config/security/jwt/JwtTokenProvider.java

@@ -13,14 +13,18 @@
 @RequiredArgsConstructor
 public class JwtTokenProvider {
     private final JwtProperties jwtProperties;
+    private Key signingKey;
 
     private Key getSigningKey() {
-        return Keys.hmacShaKeyFor(jwtProperties.getSecret().getBytes());
+        if (signingKey == null) {
+            signingKey = Keys.hmacShaKeyFor(jwtProperties.getSecret().getBytes());
+        }
+        return signingKey;
     }
 
-    public String generateToken(String email, String role) {
+    public String generateToken(Long userId, String role) {
         return Jwts.builder()
-                .setSubject(email)
+                .setSubject(String.valueOf(userId)) // email -> userId로 변경
                 .claim("role", role)
                 .setIssuedAt(new Date())
                 .setExpiration(new Date(System.currentTimeMillis() + jwtProperties.getAccessExp()))
@@ -37,8 +41,13 @@ public boolean validateToken(String token) {
         }
     }
 
-    public String getEmail(String token) {
-        return Jwts.parserBuilder().setSigningKey(getSigningKey()).build()
+    // userId 파싱 메서드 추가
+    public Long getUserId(String token) {
+        if (!validateToken(token)) {
+            throw new IllegalArgumentException("Invalid token");
+        }
+        String subject = Jwts.parserBuilder().setSigningKey(getSigningKey()).build()
                 .parseClaimsJws(token).getBody().getSubject();
+        return Long.parseLong(subject);
     }
-}
+}

src/main/java/com/wayble/server/user/dto/UserLoginRequestDto.java

@@ -1,7 +1,9 @@
 package com.wayble.server.user.dto;
 
+import com.wayble.server.user.entity.LoginType;
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
 
 public record UserLoginRequestDto(
         @NotBlank(message = "이름 또는 닉네임은 필수입니다")
@@ -12,5 +14,8 @@ public record UserLoginRequestDto(
         String email,
 
         @NotBlank(message = "비밀번호는 필수입니다")
-        String password
+        String password,
+
+        @NotNull(message = "로그인 타입은 필수입니다")
+        LoginType loginType
 ) {}

src/main/java/com/wayble/server/user/entity/User.java

@@ -18,7 +18,10 @@
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @SQLDelete(sql = "UPDATE user SET deleted_at = now() WHERE id = ?")
 @SQLRestriction("deleted_at IS NULL")
-@Table(name = "user")
+@Table(
+        name = "user",
+        uniqueConstraints = @UniqueConstraint(columnNames = {"email", "login_type"})
+)
 public class User extends BaseEntity {
 
     @Id
@@ -30,7 +33,7 @@ public class User extends BaseEntity {
 
     private String username;
 
-    @Column(nullable = false, unique = true)
+    @Column(nullable = false)
     private String email;
 
     // TODO: 비밀번호 암호화 필요

src/main/java/com/wayble/server/user/repository/UserRepository.java

@@ -1,13 +1,13 @@
 package com.wayble.server.user.repository;
 
+import com.wayble.server.user.entity.LoginType;
 import com.wayble.server.user.entity.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import java.util.Optional;
 
 public interface UserRepository extends JpaRepository<User, Long> {
 
-    Optional<User> findByEmail(String email);
-
-    boolean existsByEmail(String email);
+    boolean existsByEmailAndLoginType(String email, LoginType loginType);
+    Optional<User> findByEmailAndLoginType(String email, LoginType loginType);
 }

src/main/java/com/wayble/server/user/service/UserService.java

@@ -18,7 +18,7 @@ public class UserService {
 
     // 회원가입
     public void signup(UserRegisterRequestDto req) {
-        if (userRepository.existsByEmail(req.email())) {
+        if (userRepository.existsByEmailAndLoginType(req.email(), req.loginType())) {
             throw new ApplicationException(UserErrorCase.USER_ALREADY_EXISTS);
         }
         User user = User.createUser(

src/main/java/com/wayble/server/user/service/auth/AuthService.java

@@ -20,12 +20,12 @@ public class AuthService {
     private final JwtTokenProvider jwtProvider;
 
     public TokenResponseDto login(UserLoginRequestDto req) {
-        User user = userRepository.findByEmail(req.email())
+        User user = userRepository.findByEmailAndLoginType(req.email(), req.loginType())
                 .orElseThrow(() -> new ApplicationException(UserErrorCase.INVALID_CREDENTIALS));
         if (!encoder.matches(req.password(), user.getPassword())) {
             throw new ApplicationException(UserErrorCase.INVALID_CREDENTIALS);
         }
-        String token = jwtProvider.generateToken(user.getEmail(), user.getUserType().name());
+        String token = jwtProvider.generateToken(user.getId(), user.getUserType().name());
         return new TokenResponseDto(token);
     }
 }