refactor: Modify MemberService (#3)

Author: youjin09222

server-toy-project/src/main/java/com/gdsc_teamb/servertoyproject/login/MemberService.java

@@ -1,6 +1,6 @@
 package com.gdsc_teamb.servertoyproject.login;
 
-import com.gdsc_teamb.servertoyproject.jwt.TokenInfo;
+import com.gdsc_teamb.servertoyproject.jwt.JwtToken;
 import com.gdsc_teamb.servertoyproject.jwt.JwtTokenProvider;
 import lombok.RequiredArgsConstructor;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
@@ -19,7 +19,7 @@ public class MemberService {
     private final JwtTokenProvider jwtTokenProvider;
 
     @Transactional
-    public TokenInfo login(String memberId, String password) {
+    public JwtToken login(String memberId, String password) {
         // 1. Login ID/PW 를 기반으로 Authentication 객체 생성
         // 이때 authentication 는 인증 여부를 확인하는 authenticated 값이 false
         UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(memberId, password);
@@ -29,8 +29,8 @@ public TokenInfo login(String memberId, String password) {
         Authentication authentication = authenticationManagerBuilder.getObject().authenticate(authenticationToken);
 
         // 3. 인증 정보를 기반으로 JWT 토큰 생성
-        TokenInfo tokenInfo = jwtTokenProvider.generateToken(authentication);
+        JwtToken jwtToken = jwtTokenProvider.generateToken(authentication);
 
-        return tokenInfo;
+        return jwtToken;
     }
 }