#3 -- add default admin

src/main/java/ru/ulstu/SeminarApplication.java

@@ -2,10 +2,25 @@ package ru.ulstu;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.event.EventListener;
+import ru.ulstu.user.UserService;
 
 @SpringBootApplication
 public class SeminarApplication {
+    private final UserService userService;
+
+    public SeminarApplication(UserService userService) {
+        this.userService = userService;
+    }
+
     public static void main(String[] args) {
         SpringApplication.run(SeminarApplication.class, args);
     }
+
+    @EventListener(ApplicationReadyEvent.class)
+    public void doSomethingAfterStartup() {
+        System.out.println("hello world, I have just started up");
+        userService.initDefaultAdmin();
+    }
 }

src/main/java/ru/ulstu/model/User.java

@@ -39,6 +39,12 @@ public class User extends BaseEntity {
         roles = new HashSet<>();
     }
 
+    public User(String login, String password, Set<UserRole> roles) {
+        this.login = login;
+        this.password = password;
+        this.roles = roles;
+    }
+
     public String getLogin() {
         return login;
     }

src/main/java/ru/ulstu/user/UserService.java

@@ -5,22 +5,32 @@ import org.slf4j.LoggerFactory;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.model.User;
+import ru.ulstu.model.UserRole;
+import ru.ulstu.model.UserRoleConstants;
 
 import java.util.Collections;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 @Service
 @Transactional
 public class UserService implements UserDetailsService {
     private final Logger log = LoggerFactory.getLogger(UserService.class);
+    private final PasswordEncoder passwordEncoder;
     private final UserRepository userRepository;
+    private final UserRoleRepository userRoleRepository;
 
-    public UserService(UserRepository userRepository) {
+    public UserService(PasswordEncoder passwordEncoder,
+                       UserRepository userRepository,
+                       UserRoleRepository userRoleRepository) {
+        this.passwordEncoder = passwordEncoder;
         this.userRepository = userRepository;
+        this.userRoleRepository = userRoleRepository;
     }
 
     public User getUserByLogin(String login) {
@@ -39,4 +49,24 @@ public class UserService implements UserDetailsService {
                         .map(role -> new SimpleGrantedAuthority(role.getName()))
                         .collect(Collectors.toList()));
     }
+
+    public User createUser(User user) {
+        if (getUserByLogin(user.getLogin()) != null) {
+            throw new RuntimeException(user.getLogin());
+        }
+        //user.setRoles(Collections.singleton(new UserRole(UserRoleConstants.USER)));
+        user.setPassword(passwordEncoder.encode(user.getPassword()));
+        user = userRepository.save(user);
+        log.debug("Created Information for User: {}", user.getLogin());
+        return user;
+    }
+
+    public void initDefaultAdmin() {
+        String adminLogin = "admin";
+        String adminPassword = "adminadmin";
+        if (getUserByLogin(adminLogin) == null) {
+            UserRole adminRole = userRoleRepository.save(new UserRole(UserRoleConstants.ADMIN));
+            createUser(new User(adminLogin, adminPassword, Set.of(adminRole)));
+        }
+    }
 }