rest - 为什么我的 Spring Boot 无状态过滤器会被调用两次？

Question

我正在尝试在我使用 Spring Boot 开发的 rest api 上实现基于无状态 token 的身份验证。这个想法是客户端在任何请求中都包含一个 JWT token ，过滤器从请求中提取它，并根据 token 的内容使用相关的 Authentication 对象设置 SecurityContext。然后请求正常路由，并在映射方法上使用 @PreAuthorize 进行保护。

我的安全配置如下:

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
private JWTTokenAuthenticationService authenticationService;

@Override
protected void configure(HttpSecurity http) throws Exception
{
    http
        .csrf().disable()
        .headers().addHeaderWriter(new XFrameOptionsHeaderWriter(XFrameOptionsMode.SAMEORIGIN))
        .and()
        .authorizeRequests()
            .antMatchers("/auth/**").permitAll()
            .antMatchers("/api/**").authenticated()
            .and()
        .addFilterBefore(new StatelessAuthenticationFilter(authenticationService), UsernamePasswordAuthenticationFilter.class);
}

使用扩展 GenericFilterBean 的无状态过滤器定义如下:

public class StatelessAuthenticationFilter extends GenericFilterBean {

    private static Logger logger = Logger.getLogger(StatelessAuthenticationFilter.class);

    private JWTTokenAuthenticationService authenticationservice;

    public StatelessAuthenticationFilter(JWTTokenAuthenticationService authenticationService)
    {
        this.authenticationservice = authenticationService;
    }

    @Override
    public void doFilter(   ServletRequest request,
                            ServletResponse response,
                            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest) request;
        Authentication authentication = authenticationservice.getAuthentication(httpRequest);
        SecurityContextHolder.getContext().setAuthentication(authentication);

        logger.info("===== Security Context before request =====");
        logger.info("Request for: " + httpRequest.getRequestURI());
        logger.info(SecurityContextHolder.getContext().getAuthentication());
        logger.info("===========================================");

        chain.doFilter(request, response);

        SecurityContextHolder.getContext().setAuthentication(null);
        logger.info("===== Security Context after request =====");
        logger.info("Request for: " + httpRequest.getRequestURI());
         logger.info(SecurityContextHolder.getContext().getAuthentication());
        logger.info("===========================================");
    }

}

端点定义如下:

@PreAuthorize("hasAuthority('user')")
@RequestMapping (   value="/api/attachments/{attachmentId}/{fileName:.+}",
                    method = RequestMethod.GET)
public ResponseEntity<byte[]> getAttachedDocumentEndpoint(@PathVariable String attachmentId, @PathVariable String fileName)
{
    logger.info("GET called for /attachments/" + attachmentId + "/" + fileName);

    // do something to get the file, and return ResponseEntity<byte[]> object
}

在/api/attachments/someattachment/somefilename 上执行 GET 时，包括 token ，我可以看到过滤器被调用了两次，一次显然是使用 token ，一次没有。但是映射到请求的 restcontroller 只调用一次。

[INFO] [06-04-2015 12:26:44,465] [JWTTokenAuthenticationService] getAuthentication - Getting authentication based on token supplied in HTTP Header
[INFO] [06-04-2015 12:26:44,473] [StatelessAuthenticationFilter] doFilter - ===== Security Context before request =====
[INFO] [06-04-2015 12:26:44,473] [StatelessAuthenticationFilter] doFilter - Request for: /api/attachments/1674b08b6bbd54a6efaff4a780001a9e/jpg.png
[INFO] [06-04-2015 12:26:44,474] [StatelessAuthenticationFilter] doFilter - Name:iser, Principal:user, isAuthenticated:true, grantedAuthorites:[user]
[INFO] [06-04-2015 12:26:44,474] [StatelessAuthenticationFilter] doFilter - ===========================================
[INFO] [06-04-2015 12:26:44,476] [AttachmentRESTController] getAttachedDocumentEndpoint - GET called for /api/attachments/1674b08b6bbd54a6efaff4a780001a9e/jpg.png
[INFO] [06-04-2015 12:26:44,477] [AttachmentDBController] getAttachment - getAttachment method called with attachmentId:1674b08b6bbd54a6efaff4a780001a9e , and fileName:jpg.png
[INFO] [06-04-2015 12:26:44,483] [StatelessAuthenticationFilter] doFilter - ===== Security Context after request =====
[INFO] [06-04-2015 12:26:44,484] [StatelessAuthenticationFilter] doFilter - Request for: /api/attachments/1674b08b6bbd54a6efaff4a780001a9e/jpg.png
[INFO] [06-04-2015 12:26:44,484] [StatelessAuthenticationFilter] doFilter - 
[INFO] [06-04-2015 12:26:44,484] [StatelessAuthenticationFilter] doFilter - ===========================================
[INFO] [06-04-2015 12:26:44,507] [JWTTokenAuthenticationService] getAuthentication - No token supplied in HTTP Header
[INFO] [06-04-2015 12:26:44,507] [StatelessAuthenticationFilter] doFilter - ===== Security Context before request =====
[INFO] [06-04-2015 12:26:44,507] [StatelessAuthenticationFilter] doFilter - Request for: /api/attachments/1674b08b6bbd54a6efaff4a780001a9e/jpg.png
[INFO] [06-04-2015 12:26:44,507] [StatelessAuthenticationFilter] doFilter - 
[INFO] [06-04-2015 12:26:44,508] [StatelessAuthenticationFilter] doFilter - ===========================================
[INFO] [06-04-2015 12:26:44,508] [StatelessAuthenticationFilter] doFilter - ===== Security Context after request =====
[INFO] [06-04-2015 12:26:44,508] [StatelessAuthenticationFilter] doFilter - Request for: /api/attachments/1674b08b6bbd54a6efaff4a780001a9e/jpg.png
[INFO] [06-04-2015 12:26:44,508] [StatelessAuthenticationFilter] doFilter - 
[INFO] [06-04-2015 12:26:44,508] [StatelessAuthenticationFilter] doFilter - ===========================================

这里发生了什么 ？

编辑 :

它比我最初想象的更奇怪 - 实现一个只返回一条简单消息的简单端点显示预期的行为 - 似乎只有当我尝试将数据作为 ResponseEntity 如上所述返回时才会出现此问题。

端点:

@PreAuthorize("hasAuthority('user')")
@RequestMapping("/api/userHelloWorld")
public String userHelloWorld()
{
    return "Hello Secure User World";
}

输出，显示对过滤器的单个调用(打开额外调试):

[INFO] [06-04-2015 19:43:25,831] [JWTTokenAuthenticationService] getAuthentication - Getting authentication based on token supplied in HTTP Header
[INFO] [06-04-2015 19:43:25,844] [StatelessAuthenticationFilter] doFilterInternal - ===== Security Context before request =====
[INFO] [06-04-2015 19:43:25,844] [StatelessAuthenticationFilter] doFilterInternal - Request for: /api/userHelloWorld
[INFO] [06-04-2015 19:43:25,844] [StatelessAuthenticationFilter] doFilterInternal - Response = null 200
[INFO] [06-04-2015 19:43:25,844] [StatelessAuthenticationFilter] doFilterInternal - Name:user, Principal:user, isAuthenticated:true, grantedAuthorites:[user]
[INFO] [06-04-2015 19:43:25,845] [StatelessAuthenticationFilter] doFilterInternal - ===========================================
[DEBUG] [06-04-2015 19:43:25,845] [DispatcherServlet] doService - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/api/userHelloWorld]
[DEBUG] [06-04-2015 19:43:25,847] [AbstractHandlerMethodMapping] getHandlerInternal - Looking up handler method for path /api/userHelloWorld
[DEBUG] [06-04-2015 19:43:25,848] [AbstractHandlerMethodMapping] getHandlerInternal - Returning handler method [public java.lang.String RESTController.userHelloWorld()]
[DEBUG] [06-04-2015 19:43:25,849] [DispatcherServlet] doDispatch - Last-Modified value for [/api/userHelloWorld] is: -1
[DEBUG] [06-04-2015 19:43:25,851] [AbstractMessageConverterMethodProcessor] writeWithMessageConverters - Written [Hello Secure User World] as "text/plain;charset=UTF-8" using [org.springframework.http.converter.StringHttpMessageConverter@3eaf6fe7]
[DEBUG] [06-04-2015 19:43:25,852] [DispatcherServlet] processDispatchResult - Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
[DEBUG] [06-04-2015 19:43:25,852] [FrameworkServlet] processRequest - Successfully completed request
[INFO] [06-04-2015 19:43:25,852] [StatelessAuthenticationFilter] doFilterInternal - ===== Security Context after request =====
[INFO] [06-04-2015 19:43:25,853] [StatelessAuthenticationFilter] doFilterInternal - Request for: /api/userHelloWorld
[INFO] [06-04-2015 19:43:25,853] [StatelessAuthenticationFilter] doFilterInternal - Response = text/plain;charset=UTF-8 200
[INFO] [06-04-2015 19:43:25,853] [StatelessAuthenticationFilter] doFilterInternal - 
[INFO] [06-04-2015 19:43:25,853] [StatelessAuthenticationFilter] doFilterInternal - ===========================================

Answer 1

好的 - 所以这很荒谬，但似乎这是我调用请求的方式的问题(通过 postman Chrome 扩展)

postman 似乎在 2 个请求中触发，一个有标题，一个没有。有一个开放的错误报告在这里描述:
https://github.com/a85/POSTMan-Chrome-Extension/issues/615

如果使用 curl 或直接从浏览器调用请求，则不会看到该行为。