这篇文章主要介绍了Spring security用户URL权限FilterSecurityInterceptor使用解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
用户通过浏览器发送URL地址，由FilterSecurityInterceptor判断是否具有相应的访问权限。
对于用户请求的方法权限，例如注解@PreAuthorize("hasRole('ADMIN')")，由MethodSecurityInterceptor判断
两个拦截器都继承了AbstractSecurityInterceptor
代码如下
/* * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.security.web.access.intercept;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import org.springframework.security.access.SecurityMetadataSource;import org.springframework.security.access.intercept.AbstractSecurityInterceptor;import org.springframework.security.access.intercept.InterceptorStatusToken;import org.springframework.security.web.FilterInvocation;/** * Performs security handling of HTTP resources via a filter implementation. * 通过筛选器实现对HTTP资源的安全处理。 * <p> * The <code>SecurityMetadataSource</code> required by this security interceptor is of * type {@link FilterInvocationSecurityMetadataSource}. * <p> *安全拦截器所需的SecurityMetadataSource类型是FilterInvocationSecurityMetadataSource * * Refer to {@link AbstractSecurityInterceptor} for details on the workflow. * </p> * * @author Ben Alex * @author Rob Winch */public class FilterSecurityInterceptor extends AbstractSecurityInterceptor implementsFilter {// ~ Static fields/initializers// =====================================================================================private static final String FILTER_APPLIED = "__spring_security_filterSecurityInterceptor_filterApplied";// ~ Instance fields// ================================================================================================/***securityMetadataSource 中包含了一个HashMap，map中保存了用户请求的Http.Method和相应的URL地址*例如在Spring boot中，可能是如下的配置,参考图1*securityMetadataSource中的内容，参考图2*/private FilterInvocationSecurityMetadataSource securityMetadataSource;private Boolean observeOncePerRequest = true;// ~ Methods// ========================================================================================================/** * Not used (we rely on IoC container lifecycle services instead) * * @param arg0 ignored * * @throws ServletException never thrown */public void init(FilterConfig arg0) throws ServletException {}/** * Not used (we rely on IoC container lifecycle services instead) */public void destroy() {}/** * Method that is actually called by the filter chain. Simply delegates to the * {@link #invoke(FilterInvocation)} method. * * @param request the servlet request * @param response the servlet response * @param chain the filter chain * * @throws IOException if the filter chain fails * @throws ServletException if the filter chain fails * * *通过责任链式调用，执行doFilter方法 *FilterInvocation中保存了filter相关的信息，比如request，response，chain *通过invoke方法处理具体的url过滤 */public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {FilterInvocation fi = new FilterInvocation(request, response, chain);invoke(fi);}public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {return this.securityMetadataSource;}public SecurityMetadataSource obtainSecurityMetadataSource() {return this.securityMetadataSource;}public void setSecurityMetadataSource(FilterInvocationSecurityMetadataSource newSource) {this.securityMetadataSource = newSource;}public Class<?> getSecureObjectClass() {return FilterInvocation.class;}public void invoke(FilterInvocation fi) throws IOException, ServletException {//获取当前http请求的地址，比如说“/login”if ((fi.getRequest() != null)&& (fi.getRequest().getAttribute(FILTER_APPLIED) != null)&& observeOncePerRequest) {// filter already applied to this request and user wants us to observe// once-per-request handling, so don't re-do security checkingfi.getChain().doFilter(fi.getRequest(), fi.getResponse());} else {// first time this request being called, so perform security checkingif (fi.getRequest() != null) {fi.getRequest().setAttribute(FILTER_APPLIED, Boolean.TRUE);}//这里做主要URL比对，将当前URL与securityMetadataSource(我们自己配置)中的URL过滤条件进行比对//首先判断当前URL是permit的还是需要验证的//若需要验证，尝试加载保存在SecurityContextHolder.getContext()中的已登录信息//调用AbstractSecurityInterceptor中的AccessDecisionManager对象的decide方法//如果对于配置中需要登录才可访问的URL，已经查找到登录信息，则执行下一个FilterInterceptorStatusToken token = super.beforeInvocation(fi);try {fi.getChain().doFilter(fi.getRequest(), fi.getResponse());}finally {super.finallyInvocation(token);}super.afterInvocation(token, null);}}/** * Indicates whether once-per-request handling will be observed. By default this is * <code>true</code>, meaning the <code>FilterSecurityInterceptor</code> will only * execute once-per-request. Sometimes users may wish it to execute more than once per * request, such as when JSP forwards are being used and filter security is desired on * each included fragment of the HTTP request. * * @return <code>true</code> (the default) if once-per-request is honoured, otherwise * <code>false</code> if <code>FilterSecurityInterceptor</code> will enforce * authorizations for each and every fragment of the HTTP request. */public Boolean isObserveOncePerRequest() {return observeOncePerRequest;}public void setObserveOncePerRequest(Boolean observeOncePerRequest) {this.observeOncePerRequest = observeOncePerRequest;}}
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本文标题: Spring security用户URL权限FilterSecurityInterceptor使用解析
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