Spring Boot Security

开发一个 RESTful 接口的过程中，权限认证是必不可少的一个重要功能。

这里我们以 Spring Boot Security 为例，实现一个自定义的 Token 认证。

大致流程如下：

1. 用户 -> 登录页面 -> 用户中心 -> 获取token
2. 用户 -> token-> 当前应用 -> token-> 用户中心 -> 认证

---

首先我们新建配置文件 SecurityConfig。

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public TokenAuthenticationFilter tokenAuthenticationFilterBean() throws Exception {
        return new TokenAuthenticationFilter();
    }

    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().anyRequest().authenticated();

        http.csrf().disable();

        http.addFilterBefore(tokenAuthenticationFilterBean(), UsernamePasswordAuthenticationFilter.class);
    }
}

然后实现 TokenAuthenticationFilter 拦截器。

public class TokenAuthenticationFilter extends OncePerRequestFilter
{
    @Autowired
    private UserService userService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException
    {
        //extract token from header
        final String token = request.getHeader("x-auth-token");

        if (null != token) {
            //get and check whether token is valid ( from DB or file wherever you are storing the token)
            final User user = userService.getTokenUser(token);

            if (null != user) {
                //Populate SecurityContextHolder by fetching relevant information using token
                final UsernamePasswordAuthenticationToken authentication =
                        new UsernamePasswordAuthenticationToken(user, null, user.getAuthorities());
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        }

        filterChain.doFilter(request, response);
    }
}

最后实现用户中心认证的业务逻辑。

@Service
public class UserService {

    @Autowired
    private OrderService orderService;

    public User getTokenUser(String token) {
        //TODO
    }
}

---

参考：

https://stackoverflow.com/questions/42354138/spring-security-token-based-authentication

https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-security.html

https://www.lefer.cn/posts/55880

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