[EDIT] 会員登録・ログインにパスワード暗号化機能を追加しました。

src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java

@@ -1,5 +1,6 @@
 package com.example.demo.app.domain.service.impl;
 
+import org.mindrot.jbcrypt.BCrypt;
 import org.springframework.stereotype.Service;
 
 import com.example.demo.app.domain.model.LoginModel;
@@ -13,19 +14,26 @@ import lombok.RequiredArgsConstructor;
 @RequiredArgsConstructor
 public class LoginServiceImpl implements LoginService {
 
-    private final UserRepository userRepository;
+	private final UserRepository userRepository;
 
-    @Override
-    public LoginModel login(String mailAddress, String password) {
+	@Override
+	public LoginModel login(String mailAddress, String password) {
 
-        UserEntity userEntity = userRepository.findByMailAddressAndPassword(
-                mailAddress,
-                password).orElse(null);
+		UserEntity userEntity = userRepository
+				.findByMailAddress(mailAddress)
+				.orElse(null);
 
-        if (userEntity == null) {
-            return null;
-        }
+		if (userEntity == null) {
+			return null;
+		}
+
+		boolean isValidPassword = BCrypt.checkpw(password, userEntity.getPassword());
+
+		if (!isValidPassword) {
+			return null;
+		}
+
+		return new LoginModel(userEntity.getUserId());
+	}
 
-        return new LoginModel(userEntity.getUserId());
-    }
 }

src/main/java/com/example/demo/app/domain/service/impl/UserServiceImpl.java

@@ -1,5 +1,6 @@
 package com.example.demo.app.domain.service.impl;
 
+import org.mindrot.jbcrypt.BCrypt;
 import org.springframework.stereotype.Service;
 
 import com.example.demo.app.domain.model.UserModel;
@@ -24,14 +25,17 @@ public class UserServiceImpl implements UserService {
 	private final GoalRepository goalRepository;
 	private final CourseRepository courseRepository;
 
-	@Override
-	public void register(UserForm userForm, Long courseId, Long userId) {
+	@Override 
+	public void register(UserForm userForm, Long courseId) {
 
 		UserEntity userEntity = new UserEntity();
 
 		userEntity.setUserName(userForm.getUserName());
 		userEntity.setMailAddress(userForm.getMailAddress());
-		userEntity.setPassword(userForm.getPassword());
+
+		String passwordHashed = BCrypt.hashpw(userForm.getPassword(), BCrypt.gensalt());
+
+		userEntity.setPassword(passwordHashed);
 		userEntity.setSecretQuestionAnswer(userForm.getSecretAnswer());
 		userEntity.setBirthDate(userForm.getBirthDate());
 		userEntity.setSaving(userForm.getSaving());
@@ -44,7 +48,6 @@ public class UserServiceImpl implements UserService {
 
 		GoalEntity goalEntity = new GoalEntity();
 		goalEntity.setTargetAmount(Integer.parseInt(String.valueOf(userForm.getGoalId())));
-		goalEntity.setUserEntity(userRepository.findById(userId).get());
 
 		CourseEntity courseEntity = courseRepository.findById(courseId).orElse(null);