spring security oauth2 自动刷新续签token (refresh token)

1.引言

  • 前提:了解spring security oauth2的大致流程(对过滤器的内容有一定的了解)
  • 主要思路:
  1. 首先用过期token访问受拦截资源
  2. 认证失败返回401的时候调用异常处理器
  3. 通过异常处理器结合refresh_token进行token的刷新
  4. 刷新成功则通过请求转发(request.getRequestDispatcher)的方式再次访问受拦截资源

2.源码分析核心过滤器OAuth2AuthenticationProcessingFilter

  • 此过滤器与我们的token的各种操作息息相关,不清楚的可以参考别人的博客进行了解https://blog.csdn.net/u013815546/article/details/77046453
  • 下面是此过滤器的过滤方法,从中可以知道当授权失败抛出异常的时候将会被catch,并且通过authenticationEntryPoint.commence()调用端点异常处理器,这个被调用的异常处理器就是我们要重写的类
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
			ServletException {

		final boolean debug = logger.isDebugEnabled();
		final HttpServletRequest request = (HttpServletRequest) req;
		final HttpServletResponse response = (HttpServletResponse) res;

		try {

			Authentication authentication = tokenExtractor.extract(request);
			
            ...
			
		catch (OAuth2Exception failed) {
			SecurityContextHolder.clearContext();

			if (debug) {
				logger.debug("Authentication request failed: " + failed);
			}
			eventPublisher.publishAuthenticationFailure(new BadCredentialsException(failed.getMessage(), failed),
					new PreAuthenticatedAuthenticationToken("access-token", "N/A"));

			authenticationEntryPoint.commence(request, response,
					new InsufficientAuthenticationException(failed.getMessage(), failed));

			return;
		}

		chain.doFilter(request, response);
	}

3.分析默认端点异常处理器

  • 从过滤器源码中我们可以看到此异常处理器是有默认实现类的
public class OAuth2AuthenticationProcessingFilter implements Filter, InitializingBean {

	private final static Log logger = LogFactory.getLog(OAuth2AuthenticationProcessingFilter.class);

	private AuthenticationEntryPoint authenticationEntryPoint = new OAuth2AuthenticationEntryPoint();

    ...

}
  • 通过查看此默认处理器,我们可以发现里面主要调用了doHandle的方法 
public class OAuth2AuthenticationEntryPoint extends AbstractOAuth2SecurityExceptionHandler implements
		AuthenticationEntryPoint {

	...

	public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException)
			throws IOException, ServletException {
		doHandle(request, response, authException);
	}

    ...

}
  • 我们再次查看doHandle的具体内容可以得出此过滤器的主要功能有3个:
  1. 解析异常类型
  2. 扩展respone的一些属性和内容
  3. respone 刷新缓存直接返回
protected final void doHandle(HttpServletRequest request, HttpServletResponse response, Exception authException)
			throws IOException, ServletException {
		try {
			ResponseEntity result = exceptionTranslator.translate(authException);
			result = enhanceResponse(result, authException);
			exceptionRenderer.handleHttpEntityResponse(result, new ServletWebRequest(request, response));
			response.flushBuffer();
		}
		
        ...
	}

4.重写异常处理器

  • 对默认异常处理器的分析,我们可以得出如果是我们需要的异常(401异常)则用我们自定义的方法进行处理,如果是其他异常则让原来的异常处理器处理即可,大致思路如下:
  1. 通过exceptionTranslator.translate(authException)解析异常,判断异常类型(status)
  2. 如果不是401异常,则直接调用默认异常处理器的处理方法即可
  3. 如果是401异常则向授权服务器发起token刷新的请求
  4. 如果token刷新成功,则通过request.getRequestDispatcher(request.getRequestURI()).forward(request,response);再次请求资源
  5. 如果token刷新失败,要么跳转到登陆页面(web的话也可以通过response.sendirect跳转到登陆页面),要么返回错误信息(json)
public class LLGAuthenticationEntryPoint extends OAuth2AuthenticationEntryPoint {

    @Autowired
    private OAuth2ClientProperties oAuth2ClientProperties;
    @Autowired
    private BaseOAuth2ProtectedResourceDetails baseOAuth2ProtectedResourceDetails;
    private WebResponseExceptionTranslator exceptionTranslator = new DefaultWebResponseExceptionTranslator();
    @Autowired
    RestTemplate restTemplate;
    
    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
        try {
            //解析异常,如果是401则处理
            ResponseEntity result = exceptionTranslator.translate(authException);
            if (result.getStatusCode() == HttpStatus.UNAUTHORIZED) {
                MultiValueMap formData = new LinkedMultiValueMap();
                formData.add("client_id", oAuth2ClientProperties.getClientId());
                formData.add("client_secret", oAuth2ClientProperties.getClientSecret());
                formData.add("grant_type", "refresh_token");
                Cookie[] cookie=request.getCookies();
                for(Cookie coo:cookie){
                    if(coo.getName().equals("refresh_token")){
                        formData.add("refresh_token", coo.getValue());
                    }
                }
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
                Map map = restTemplate.exchange(baseOAuth2ProtectedResourceDetails.getAccessTokenUri(), HttpMethod.POST,
                            new HttpEntity>(formData, headers), Map.class).getBody();
                //如果刷新异常,则坐进一步处理
                if(map.get("error")!=null){
                    // 返回指定格式的错误信息
                    response.setStatus(401);
                    response.setHeader("Content-Type", "application/json;charset=utf-8");
                    response.getWriter().print("{\"code\":1,\"message\":\""+map.get("error_description")+"\"}");
                    response.getWriter().flush();
                    //如果是网页,跳转到登陆页面
                    //response.sendRedirect("login");
                }else{
                    //如果刷新成功则存储cookie并且跳转到原来需要访问的页面
                    for(Object key:map.keySet()){
                        response.addCookie(new Cookie(key.toString(),map.get(key).toString()));
                    }
                    request.getRequestDispatcher(request.getRequestURI()).forward(request,response);
                }
            }else{
                //如果不是401异常,则以默认的方法继续处理其他异常
                super.commence(request,response,authException);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

5.将处理器设置到过滤器上

  • 由于spring security遵循适配器的设计模式,所以我们可以直接从配置类上配置此处理器
@EnableResourceServer
@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
public abstract class ResServerConfig extends ResourceServerConfigurerAdapter {

    ...

    @Override
    public void configure(ResourceServerSecurityConfigurer resources) throws Exception {
        super.configure(resources);
       
        resources.authenticationEntryPoint(new LLGAuthenticationEntryPoint());
      
    }

6.实战

6.1向授权服务器获取token

  • 首先编写登陆控制器,通过restTemplate向授权服务器获取token并且存入cookie
PostMapping(value = "/login")
    public ResponseEntity login(@RequestBody @Valid LoginDTO loginDTO, BindingResult bindingResult, HttpServletResponse response) throws Exception {
        if (bindingResult.hasErrors()) {
            throw new Exception("登录信息格式错误");
        } else {
            //Http Basic 验证
            String clientAndSecret = oAuth2ClientProperties.getClientId() + ":" + oAuth2ClientProperties.getClientSecret();
            //这里需要注意为 Basic 而非 Bearer
            clientAndSecret = "Basic " + Base64.getEncoder().encodeToString(clientAndSecret.getBytes());
            HttpHeaders httpHeaders = new HttpHeaders();
            httpHeaders.set("Authorization", clientAndSecret);
            //授权请求信息
            MultiValueMap map = new LinkedMultiValueMap<>();
            map.put("username", Collections.singletonList(loginDTO.getUsername()));
            map.put("password", Collections.singletonList(loginDTO.getPassword()));
            map.put("grant_type", Collections.singletonList(oAuth2ProtectedResourceDetails.getGrantType()));
            map.put("scope", oAuth2ProtectedResourceDetails.getScope());
            //HttpEntity
            HttpEntity httpEntity = new HttpEntity(map, httpHeaders);
            //获取 Token
            ResponseEntity body = restTemplate.exchange(oAuth2ProtectedResourceDetails.getAccessTokenUri(), HttpMethod.POST, httpEntity, OAuth2AccessToken.class);
            OAuth2AccessToken oAuth2AccessToken = body.getBody();
            response.addCookie(new Cookie("access_token", oAuth2AccessToken.getValue()));
            response.addCookie(new Cookie("refresh_token", oAuth2AccessToken.getRefreshToken().getValue()));
            return body;
        }
    }
  • 之后我在这里通过idea的 HTTP Client 工具模拟请求获取token
  • 获取access_token请求(/oauth/token) 
    请求所需参数:client_id、client_secret、grant_type、username、password

spring security oauth2 自动刷新续签token (refresh token)_第1张图片

spring security oauth2 自动刷新续签token (refresh token)_第2张图片

6.2模拟失效token访问资源服务器

  • 使用失效的token访问资源的时候,可以发现断点直接到达异常处理器,由此看出token确实是失效的并且进入了异常处理器进行处理,最终通过refresh_token获取到最新的token再次成功访问获取资源
  • 刷新token请求(/oauth/token) 
    请求所需参数:grant_type、refresh_token、client_id、client_secret 
    其中grant_type为固定值:grant_type=refresh_token

spring security oauth2 自动刷新续签token (refresh token)_第3张图片

spring security oauth2 自动刷新续签token (refresh token)_第4张图片

spring security oauth2 自动刷新续签token (refresh token)_第5张图片

7.总结

本次由于对spring security oauth2了解不深入,导致在寻找异常抛出解决方法的时候折腾了一下,整体的思路并不复杂,只是用到了最普通的请求转发,但是需要对过滤器链有一定了解,打断点慢慢看是不错的选择。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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