Vaadin4Spring的ManagedSecurity:如何更新用户列表？

Question

我使用的是Vaadin7.5.6，Vaadins Spring 1.0.0，Vaadin4Spring托管安全扩展0.0.7-快照和Tomcat8。

目前，我得到了一个实现AuthenticationManagerConfigurer接口的配置类：

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.vaadin.spring.security.annotation.EnableVaadinManagedSecurity;
import org.vaadin.spring.security.config.AuthenticationManagerConfigurer;

import com.vaadin.server.CustomizedSystemMessages;
import com.vaadin.server.SystemMessages;
import com.vaadin.server.SystemMessagesInfo;
import com.vaadin.server.SystemMessagesProvider;

import de.blume2000.kiss.hibernate.dto.User;
import de.blume2000.kiss.hibernate.services.UserService;
import de.blume2000.kiss.utils.EncryptionUtil;

@Configuration
@EnableVaadinManagedSecurity
public class SecurityConfiguration implements AuthenticationManagerConfigurer
{

    @Autowired
    UserService userService;

    @Override
    public void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        List<User> users = userService.findAll();

        if (users == null)
            return;

        for (User user : users)
        {
            String encryptedPassword = EncryptionUtil.decryptPassword(user.getPassword(), user.getSalt());
            auth.inMemoryAuthentication().withUser(user.getUsername()).password(encryptedPassword).roles(user.getRole());
        }

    }

    /**
     * Provide custom system messages to make sure the application is reloaded when the session expires.
     */
    @SuppressWarnings("serial")
    @Bean
    SystemMessagesProvider systemMessagesProvider()
    {
        return new SystemMessagesProvider()
        {
            @Override
            public SystemMessages getSystemMessages(SystemMessagesInfo systemMessagesInfo)
            {
                CustomizedSystemMessages systemMessages = new CustomizedSystemMessages();
                systemMessages.setSessionExpiredNotificationEnabled(false);
                return systemMessages;
            }
        };
    }

}

现在，如果用户登录，他可以选择编辑他的用户帐户设置。这将更改数据库中的用户对象(例如登录的用户名)。现在，如果他进行注销，我希望应用程序重新加载用户列表，这样用户就可以使用他的新用户名。这怎麽可能？

问心无愧

Answer 1

简而言之，将内存中的身份验证替换为DAO身份验证。

请注意，在下面的示例中，UserDetailsService userService是Spring接口，而UserRepository userRepository是用户的DAO (在示例中也称为UserService userService )。

1.配置

@Configuration
public class Authorization extends GlobalAuthenticationConfigurerAdapter {

    @Autowired
    private UserDetailsService userService;

    @Override
    public void init(AuthenticationManagerBuilder auth) throws Exception {
       auth.userDetailsService(userService).passwordEncoder(passwordEncoder());
    }

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }
}

2.提供用户详细信息的服务

@Service
public class UserService implements UserDetailsService {

    @Autowired
    private UserRepository userRepository;

    @Override
    @Transactional(readOnly = true)
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException(username);
        }
        return user;
    }
}