SpringSecurity实现动态管理权限(三)

SpringBoot整合SpringSecurity实现接口动态管理权限

接上一篇权限管理是后台管理不可缺少的部分，今天结合SpringSecurity实现接口的动态管理。

动态权限管理

SpringSecurity实现权限动态管理，第一步需要创建一个过滤器,doFilter方法需要注意,对于OPTIONS直接放行,否则会出现跨域问题。并且对在上篇文章提到的IgnoreUrlsConfig中的白名单也是直接放行，所有的权限操作都会在super.beforeInvocation(fi)中实现。

/*** 动态权限过滤器，用于实现基于路径的动态权限过滤**/public class DynamicSecurityFilter extends AbstractSecurityInterceptor implements Filter {@Autowiredprivate DynamicSecurityMetadataSource dynamicSecurityMetadataSource;@Autowiredprivate IgnoreUrlsConfig ignoreUrlsConfig;@Autowiredpublic void setMyAccessDecisionManager(DynamicAccessDecisionManager dynamicAccessDecisionManager) {super.setAccessDecisionManager(dynamicAccessDecisionManager);}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) servletRequest;FilterInvocation fi = new FilterInvocation(servletRequest, servletResponse, filterChain);//OPTIONS请求直接放行if(request.getMethod().equals(HttpMethod.OPTIONS.toString())){fi.getChain().doFilter(fi.getRequest(), fi.getResponse());return;}//白名单请求直接放行PathMatcher pathMatcher = new AntPathMatcher();for (String path : ignoreUrlsConfig.getUrls()) {if(pathMatcher.match(path,request.getRequestURI())){fi.getChain().doFilter(fi.getRequest(), fi.getResponse());return;}}//此处会调用AccessDecisionManager中的decide方法进行鉴权操作InterceptorStatusToken token = super.beforeInvocation(fi);try {fi.getChain().doFilter(fi.getRequest(), fi.getResponse());} finally {super.afterInvocation(token, null);}}@Overridepublic void destroy() {}@Overridepublic Class<?> getSecureObjectClass() {return FilterInvocation.class;}@Overridepublic SecurityMetadataSource obtainSecurityMetadataSource() {return dynamicSecurityMetadataSource;}}

在DynamicSecurityFilter中调用super.beforeInvocation(fi)方法时会调用AccessDecisionManager中的decide方法用于鉴权操作,而decide方法中的configAttributes参数会通过SecurityMetadataSource中的getAttributes方法来获取，configAttributes其实就是配置好的访问当前接口所需要的权限，下面是简化版的beforeInvocation源码

public abstract class AbstractSecurityInterceptor implements InitializingBean,ApplicationEventPublisherAware, MessageSourceAware {protected InterceptorStatusToken beforeInvocation(Object object) {//获取元数据Collection<ConfigAttribute> attributes = this.obtainSecurityMetadataSource().getAttributes(object);Authentication authenticated = authenticateIfRequired();//进行鉴权操作try {this.accessDecisionManager.decide(authenticated, object, attributes);}catch (AccessDeniedException accessDeniedException) {publishEvent(new AuthorizationFailureEvent(object, attributes, authenticated,accessDeniedException));throw accessDeniedException;}}}

上面的介绍，接下来我们实现SecurityMetadataSource接口的getAttributes方法，来获取当前访问的路径资源

/*** 动态权限数据源，用于获取动态权限规则**/public class DynamicSecurityMetadataSource implements FilterInvocationSecurityMetadataSource {private static Map<String, ConfigAttribute> configAttributeMap = null;@Autowiredprivate DynamicSecurityService dynamicSecurityService;@PostConstructpublic void loadDataSource() {configAttributeMap = dynamicSecurityService.loadDataSource();}public void clearDataSource() {configAttributeMap.clear();configAttributeMap = null;}@Overridepublic Collection<ConfigAttribute> getAttributes(Object o) throws IllegalArgumentException {if (configAttributeMap == null) this.loadDataSource();List<ConfigAttribute>  configAttributes = new ArrayList<>();//获取当前访问的路径String url = ((FilterInvocation) o).getRequestUrl();String path = URLUtil.getPath(url);PathMatcher pathMatcher = new AntPathMatcher();Iterator<String> iterator = configAttributeMap.keySet().iterator();//获取访问该路径所需资源while (iterator.hasNext()) {String pattern = iterator.next();if (pathMatcher.match(pattern, path)) {configAttributes.add(configAttributeMap.get(pattern));}}// 未设置操作请求权限，返回空集合return configAttributes;}@Overridepublic Collection<ConfigAttribute> getAllConfigAttributes() {return null;}@Overridepublic boolean supports(Class<?> aClass) {return true;}}

我们的后台资源被规则缓存到了一个MAP对象中，所有当后台资源变化时，需要清除缓存，在下次查询的时候重新加载。我们需要修改MyMesResourceController注入DynamicSecurityMetadataSource，当修改后台资源时，需要调用clearDataSource方法来清空缓存的数据。

/*** 后台资源管理Controller**/@Controller@Api(tags = \"MyMesResourceController\", description = \"后台资源管理\")@RequestMapping(\"/resource\")public class MyMesResourceController {@Autowiredprivate MyMesResourceService resourceService;@Autowiredprivate DynamicSecurityMetadataSource dynamicSecurityMetadataSource;@ApiOperation(\"添加后台资源\")@RequestMapping(value = \"/create\", method = RequestMethod.POST)@ResponseBodypublic CommonResult create(@RequestBody UmsResource umsResource) {int count = resourceService.create(umsResource);dynamicSecurityMetadataSource.clearDataSource();if (count > 0) {return CommonResult.success(count);} else {return CommonResult.failed();}}}

我们需要实现AccessDecisionManager接口来实现权限校验，对于没有配置资源的接口我们直接允许访问，对于配置了资源的接口，我们把访问所需资源和用户拥有的资源进行比对，如果匹配则允许访问。

/*** 动态权限决策管理器，用于判断用户是否有访问权限**/public class DynamicAccessDecisionManager implements AccessDecisionManager {@Overridepublic void decide(Authentication authentication, Object object,Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {// 当接口未被配置资源时直接放行if (CollUtil.isEmpty(configAttributes)) {return;}Iterator<ConfigAttribute> iterator = configAttributes.iterator();while (iterator.hasNext()) {ConfigAttribute configAttribute = iterator.next();//将访问所需资源或用户拥有资源进行比对String needAuthority = configAttribute.getAttribute();for (GrantedAuthority grantedAuthority : authentication.getAuthorities()) {if (needAuthority.trim().equals(grantedAuthority.getAuthority())) {return;}}}throw new AccessDeniedException(\"抱歉，您没有访问权限\");}@Overridepublic boolean supports(ConfigAttribute configAttribute) {return true;}@Overridepublic boolean supports(Class<?> aClass) {return true;}}

我们之前在DynamicSecurityMetadataSource中注入了一个DynamicSecurityService对象，它是我自定义的一个动态权限业务接口，其主要用于加载所有的后台资源规则。

/*** 动态权限相关业务类**/public interface DynamicSecurityService {/*** 加载资源ANT通配符和资源对应MAP*/Map<String, ConfigAttribute> loadDataSource();}

结合SpringSecurity实现接口的动态管理权限基本已经实现，明天后天准备讲解一下Redis+AOP优化权限管理

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