REST API 基于ACCESS TOKEN 的权限解决方案

REST token 找到用户，然后找到用户资源

但总不能每个方法都去调用token验证的方法在进入controller前集中处理，用 Interceptor实现

• 由于根据token

  interceptor实现：

  /**
   * 验证token有效性
   */
  @Component
  public class AccessTokenVerifyInterceptor extends HandlerInterceptorAdapter {
      @Resource
      UserService userService;
  
      private final static Logger LOG = LoggerFactory.getLogger(AccessTokenVerifyInterceptor.class);
  
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
              throws Exception {
          LOG.debug("AccessTokenVerifyInterceptor executing.......");
          boolean flag = false;
          //accesstoken 参数
          String accessToken = request.getParameter("accesstoken");
          if(StringUtils.notEmpty(accessToken)) {
              //验证accessToken
              //verifyAccessToken 已做缓存处理
              User user = userService.verifyAccessToken(accessToken);
              if(user!=null){
                  flag = true;
                  //塞到request中去，供controller里面调用
                  request.setAttribute(SystemConstants.SESSION_NAME_USER,user);
              }
          }
  
          if(!flag){
              response.setStatus(HttpStatus.FORBIDDEN.value());
              response.getWriter().print("wrong token");
          }
          return flag;
      }
  }

  然后到spring配置文件中加上这个拦截器：

  <!--过滤器-->
  <mvc:interceptors>
      <!--API TOKEN INTERCEPTOR-->
      <mvc:interceptor>
          <mvc:mapping path="/api/**"/>
          <mvc:exclude-mapping path="/**/api/user/**" />
          <mvc:exclude-mapping path="/**/api/accesstoken" />
          <bean class="cn.ifengkou.athena.controller.interceptor.AccessTokenVerifyInterceptor"></bean>
      </mvc:interceptor>
      <!--other interceptor -->
  </mvc:interceptors>

  缓存处理

  pom.xml中加入ehcache包：（spring集成ehcache ，需要spring-context和spring-context-support）

          <dependency>
              <groupId>net.sf.ehcache</groupId>
              <artifactId>ehcache</artifactId>
              <version>2.10.0</version>
          </dependency>

  加入ehcache.xml，大部分都是默认，参考springside里面说的，改了updateCheck="false",

  <ehcache updateCheck="false"
           monitoring="autodetect"
           dynamicConfig="true">
      <diskStore path="java.io.tmpdir" />
      <cache name="accessTokenUser"
             maxEntriesLocalHeap="10000"
             maxEntriesLocalDisk="1000"
             eternal="false"
             diskSpoolBufferSizeMB="20"
             timeToIdleSeconds="300" timeToLiveSeconds="600"
             memoryStoreEvictionPolicy="LFU"
             transactionalMode="off">
          <persistence strategy="localTempSwap" />
      </cache>
  </ehcache>

  开启缓存，在spring配置文件中加入：

  <!-- 缓存配置 -->
  <!-- 启用缓存注解功能(请将其配置在Spring主配置文件中) -->
  <cache:annotation-driven cache-manager="cacheManager" />
  
  <!-- Spring自己的基于java.util.concurrent.ConcurrentHashMap实现的缓存管理器(该功能是从Spring3.1开始提供的) -->
  <!-- <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
      <property name="caches"> <set> <bean name="myCache" class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"/>
      </set> </property> </bean> -->
  <!-- 若只想使用Spring自身提供的缓存器,则注释掉下面的两个关于Ehcache配置的bean,并启用上面的SimpleCacheManager即可 -->
  <!-- Spring提供的基于的Ehcache实现的缓存管理器 -->
  <bean id="cacheManagerFactory"
        class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
      <property name="configLocation" value="classpath:ehcache.xml" />
  </bean>
  <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
      <property name="cacheManager" ref="cacheManagerFactory" />
  </bean>

  对verifyAccessToken 方法做缓存处理，也就是在原有方法上加Cacheable注解：

  @Cacheable(value = "accessTokenUser",key = "#accessToken")
  @Override
  public User verifyAccessToken(String accessToken) {
      LOG.debug("verifyAccessToken executing......");
      List<User> users = userDao.getUserByAccessToken(accessToken);
      if(users.size()!=1){
          if(users.size()>1){
              LOG.error("accessToken 出现了重复，bug！请检查！");
          }
          return null;
      }
      return users.get(0);
  }

  开始run出现

• 2015-12-04 15:25:56,531 INFO [cn.ifengkou.athena.controller.interceptor.AccessTokenVerifyInterceptor] - <AccessTokenVerifyInterceptor executing.......>
  2015-12-04 15:25:56,628 INFO [cn.ifengkou.athena.service.impl.UserServiceImpl] - <verifyAccessToken executing......>
  2015-12-04 15:26:21,838 INFO [cn.ifengkou.athena.controller.interceptor.AccessTokenVerifyInterceptor] - <AccessTokenVerifyInterceptor executing.......>
  2015-12-04 15:26:29,184 INFO [cn.ifengkou.athena.controller.interceptor.AccessTokenVerifyInterceptor] - <AccessTokenVerifyInterceptor executing.......>
  

• 如有token无效，查出来User为null，cache 把null也缓存起来了