Fix/#46 signup role (회원 Role 변경 및 RefreshToken 설정)

backend/core/src/main/java/com/rollthedice/backend/domain/member/entity/Member.java

@@ -41,7 +41,8 @@ public void updateRefreshToken(String updateRefreshToken) {
         this.refreshToken = updateRefreshToken;
     }
 
-    public void updateNickname(String nickname) {
+    public void signUp(String nickname) {
         this.nickname = nickname;
+        this.role = Role.USER;
     }
 }

backend/core/src/main/java/com/rollthedice/backend/domain/member/service/MemberService.java

@@ -15,6 +15,6 @@ public class MemberService {
     @Transactional
     public void signUp(SignUpDto dto) {
         Member member = authService.getMember();
-        member.updateNickname(dto.getNickname());
+        member.signUp(dto.getNickname());
     }
 }

backend/core/src/main/java/com/rollthedice/backend/global/jwt/filter/JwtAuthenticationProcessingFilter.java

@@ -78,9 +78,14 @@ private void checkAccessTokenAndAuthentication(HttpServletRequest request, HttpS
     }
 
     public void saveAuthentication(Member member) {
+        String password = member.getPassword();
+        if (password == null) {
+            password = PasswordUtil.generateRandomPassword();
+        }
+
         UserDetails userDetails = User.builder()
                 .username(member.getEmail())
-                .password(PasswordUtil.generateRandomPassword())
+                .password(password)
                 .roles(member.getRole().name())
                 .build();