리펙토링 : MemberDetails에서 Member 엔티티 의존성 제거

MemberDetails에서 필드로 있었던 Member 엔티티를 Username, Password, Role로 나눈 후에 생성자에서 초기화 하는 것으로 변경

src/main/java/com/readingbooks/web/security/authenticationprovider/ReadingBooksAuthenticationProvider.java

@@ -19,14 +19,20 @@ public class ReadingBooksAuthenticationProvider implements AuthenticationProvide
 
     @Override
     public Authentication authenticate(Authentication authentication) throws AuthenticationException {
+        /* --- 아이디 관련 검증(UserDetailsService) --- */
         String email = authentication.getName();
         UserDetails memberDetails = memberDetailsService.loadUserByUsername(email);
 
+        /* --- 비밀번호 관련 검증(PasswordEncoder) --- */
+        String credential = matchPassword(authentication, memberDetails);
+        return new UsernamePasswordAuthenticationToken(email, credential, memberDetails.getAuthorities());
+    }
+
+    private String matchPassword(Authentication authentication, UserDetails memberDetails) {
         String rawPassword = authentication.getCredentials().toString();
         String hashPassword = memberDetails.getPassword();
         checkPassword(rawPassword, hashPassword);
-
-        return new UsernamePasswordAuthenticationToken(email, rawPassword, memberDetails.getAuthorities());
+        return rawPassword;
     }
 
     private void checkPassword(String rawPassword, String hashPassword) {