b2b2c系统jwt权限源码分享part2

　　在上一篇《b2b2c系统jwt权限源码分享part1》中和大家分享了b2b2c系统中jwt权限的基础设计及源码，本文继续和大家分享jwt和spring security整合部分的思路和源码。

在上一篇文章中已经分享了关键的类图：

 

如上图所示，权限的校验主要涉及到四个类：

• AbstractAuthenticationService

• BuyerAuthenticationService

• SellerAuthenticationService

• AdminAuthenticationService

 

AbstractAuthenticationService

对于三端（买家买家管理端）验权的公用部分我们抽象在AbstractAuthenticationService中：

public abstract class AbstractAuthenticationService implements AuthenticationService {

    @Autowired
    protected TokenManager tokenManager;


    private final Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * 单例模式的cache
     */
    private static Cache<String, Integer> cache;


    @Autowired
    private JavashopConfig javashopConfig;


    /**
     * 鉴权，先获取token，再根据token来鉴权
     * 生产环境要由nonce和时间戳，签名来获取token
     * 开发环境可以直接传token
     *
     * @param req
     */
    @Override
    public void auth(HttpServletRequest req) {
        String token = this.getToken(req);
        if (StringUtil.notEmpty(token)) {
            Authentication authentication = getAuthentication(token);
            if (authentication != null) {
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }

        }
    }

    /**
     * 接收用户禁用或解禁事件<br/>
     * 禁用：将被禁用的用户id写入缓存
     * 解禁：将缓存中存放的用户id删除
     *
     * @param userDisableMsg
     */
    @Override
    public void userDisableEvent(UserDisableMsg userDisableMsg) {

        //在缓存中记录用户被禁用
        Cache<String, Integer> cache = this.getCache();

        if (UserDisableMsg.ADD.equals(userDisableMsg.getOperation())) {
            logger.debug("收到用户禁用消息:" + userDisableMsg);
            cache.put(getKey(userDisableMsg.getRole(), userDisableMsg.getUid()), 1);
        }

        if (UserDisableMsg.DELETE.equals(userDisableMsg.getOperation())) {
            logger.debug("收到用户解禁消息:" + userDisableMsg);
            cache.remove(getKey(userDisableMsg.getRole(), userDisableMsg.getUid()), 1);
        }
    }

    protected void checkUserDisable(Role role, int uid) {
        Cache<String, Integer> cache = this.getCache();
        Integer isDisable = cache.get(getKey(role, uid));
        if (isDisable == null) {
            return;
        }
        if (1 == isDisable) {
            throw new RuntimeException("用户已经被禁用");
        }
    }

    private String getKey(Role role, int uid) {

        return role.name() + "_" + uid;
    }

    /**
     * 解析一个token
     * 子类需要将token解析自己的子业务权限模型：Admin,seller buyer...
     *
     * @param token
     * @return
     */
    protected abstract AuthUser parseToken(String token);

    /**
     * 根据一个 token 生成授权
     *
     * @param token
     * @return 授权
     */
    protected Authentication getAuthentication(String token) {
        try {

            AuthUser user = parseToken(token);
            List<GrantedAuthority> auths = new ArrayList<>();

            List<String> roles = user.getRoles();

            for (String role : roles) {
                auths.add(new SimpleGrantedAuthority("ROLE_" + role));
            }

            UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken("user", null, auths);
            authentication.setDetails(user);

            return authentication;
        } catch (Exception e) {
            logger.error("认证异常", e);
            return new UsernamePasswordAuthenticationToken("anonymous", null);
        }
    }

    /**
     * 获取token
     * 7.2.0起，废弃掉重放攻击的判断
     *
     * @param req
     * @return
     */
    protected String getToken(HttpServletRequest req) {

        String token = req.getHeader(TokenConstant.HEADER_STRING);
        if (StringUtil.notEmpty(token)) {
            token = token.replaceAll(TokenConstant.TOKEN_PREFIX, "").trim();
        }

        return token;
    }

    private static final Object lock = new Object();

    /**
     * 获取本地缓存<br/>
     * 用于记录被禁用的用户<br/>
     * 此缓存的key为：角色+用户id，如： admin_1
     * value为：1则代表此用户被禁用
     *
     * @return
     */
    protected Cache<String, Integer> getCache() {

        if (cache != null) {
            return cache;
        }
        synchronized (lock) {
            if (cache != null) {
                return cache;
            }
            //缓存时间为session有效期+一分钟
            //也就表示，用户如果被禁用，session超时这个cache也就不需要了：
            //因为他需要重新登录就可以被检测出无效
            int sessionTimeout = javashopConfig.getRefreshTokenTimeout() - javashopConfig.getAccessTokenTimeout() + 60;

            //使用ehcache作为缓存
            CachingProvider provider = Caching.getCachingProvider("org.ehcache.jsr107.EhcacheCachingProvider");
            CacheManager cacheManager = provider.getCacheManager();

            MutableConfiguration<String, Integer> configuration =
                    new MutableConfiguration<String, Integer>()
                            .setTypes(String.class, Integer.class)
                            .setStoreByValue(false)
                            .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(new Duration(TimeUnit.SECONDS, sessionTimeout)));

            cache = cacheManager.createCache("userDisable", configuration);

            return cache;
        }
    }

}
 

 

在 javashop b2b2c系统中 禁用用户要求该用户立刻无法操作，这部分功能体现在

checkUserDisable方法中，思路是通过监听redis消息将禁用用户放在本地cache中（这里采用的事EHCache。

 

BuyerAuthenticationService

有了之前的代码基础，三端的权限校验就比较简单了：

 

@Component
public class BuyerAuthenticationService extends AbstractAuthenticationService {

    @Override
    protected AuthUser parseToken(String token) {
        AuthUser authUser=  tokenManager.parse(Buyer.class, token);
        User  user = (User) authUser;
        checkUserDisable(Role.BUYER, user.getUid());
        return authUser;
    }

}
 

 

SellerAuthenticationService

@Component
public class SellerAuthenticationService extends AbstractAuthenticationService {

    /**
     * 将token解析为Clerk
     *
     * @param token
     * @return
     */
    @Override
    protected AuthUser parseToken(String token) {
        AuthUser authUser = tokenManager.parse(Clerk.class, token);
        User user = (User) authUser;
        checkUserDisable(Role.CLERK, user.getUid());
        return authUser;
    }

}

AdminAuthenticationService

 

@Component
public class AdminAuthenticationService extends AbstractAuthenticationService {


    /**
     * 将token解析为Admin
     * @param token
     * @return
     */
    @Override
    protected AuthUser parseToken(String token) {

        AuthUser authUser=  tokenManager.parse(Admin.class, token);
        User user = (User) authUser;
        checkUserDisable(Role.ADMIN, user.getUid());
        return authUser;

    }

}

 

整合Security:

 

@Configuration
@EnableWebSecurity
public class BuyerSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private DomainHelper domainHelper;

    @Autowired
    private BuyerAuthenticationService buyerAuthenticationService;

    @Autowired
    private AccessDeniedHandler accessDeniedHandler;

    @Autowired
    private AuthenticationEntryPoint authenticationEntryPoint;




    /**
     * 定义seller工程的权限
     *
     * @param http
     * @throws Exception
     */
    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.cors().configurationSource((CorsConfigurationSource) ApplicationContextHolder.getBean("corsConfigurationSource")).and().csrf().disable()
                //禁用session
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()

                //定义验权失败返回格式
                .exceptionHandling().accessDeniedHandler(accessDeniedHandler).authenticationEntryPoint(authenticationEntryPoint).and()
                .authorizeRequests()
                .and()
                .addFilterBefore(new TokenAuthenticationFilter(buyerAuthenticationService),
                        UsernamePasswordAuthenticationFilter.class);

        //过滤掉swagger的路径
        http.authorizeRequests().antMatchers("/v2/api-docs", "/configuration/ui", "/swagger-resources", "/configuration/security", "/swagger-ui.html", "/webjars/**").anonymous();
        //过滤掉不需要买家权限的api
        http.authorizeRequests().antMatchers("/debugger/**" ).permitAll().and();
        //定义有买家权限才可以访问
        http.authorizeRequests().anyRequest().hasRole(Role.BUYER.name());
        http.headers().addHeaderWriter(xFrameOptionsHeaderWriter());
        //禁用缓存
        http.headers().cacheControl().and()
                .contentSecurityPolicy("script-src  'self' 'unsafe-inline' ; frame-ancestors " + domainHelper.getBuyerDomain());

    }

 

以上就是javashop电商系统源码中关于权限相关的分享。