package com.lanyuan.security;
import java.io.IOException;
import javax.annotation.PostConstruct;
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.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.web.FilterInvocation;
import org.springframework.stereotype.Service;
/**
* 核心的InterceptorStatusToken token = super.beforeInvocation(fi);会调用我们定义的accessDecisionManager:decide(Object object)和securityMetadataSource
:getAttributes(Object object)方法。
* 自己实现的过滤用户请求类，也可以直接使用 FilterSecurityInterceptor
*
* AbstractSecurityInterceptor有三个派生类：
* FilterSecurityInterceptor，负责处理FilterInvocation，实现对URL资源的拦截。
* MethodSecurityInterceptor，负责处理MethodInvocation，实现对方法调用的拦截。
* AspectJSecurityInterceptor，负责处理JoinPoint，主要是用于对切面方法(AOP)调用的拦截。
*
* 还可以直接使用注解对Action方法进行拦截，例如在方法上加：
* @PreAuthorize("hasRole('ROLE_SUPER')")
*
*
* @author lanyuan
* 2013-11-19
* @Email: mmm333zzz520@163.com
* @version 1.0v
*/
@Service
public class MySecurityFilter extends AbstractSecurityInterceptor implements Filter {
//与applicationContext-security.xml里的myFilter的属性securityMetadataSource对应，
//其他的两个组件，已经在AbstractSecurityInterceptor定义
@Autowired
private MySecurityMetadataSource securityMetadataSource;
@Autowired
private MyAccessDecisionManager accessDecisionManager;
@Autowired
private AuthenticationManager myAuthenticationManager;
@PostConstruct
public void init(){
// System.err.println(" --------------- MySecurityFilter init--------------- ");
super.setAuthenticationManager(myAuthenticationManager);
super.setAccessDecisionManager(accessDecisionManager);
}
@Override
public SecurityMetadataSource obtainSecurityMetadataSource() {
return this.securityMetadataSource;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
FilterInvocation fi = new FilterInvocation(request, response, chain);
invoke(fi);
}
private void invoke(FilterInvocation fi) throws IOException, ServletException {
// object为FilterInvocation对象
//super.beforeInvocation(fi);源码
//1.获取请求资源的权限
//执行Collection<ConfigAttribute> attributes = SecurityMetadataSource.getAttributes(object);
//2.是否拥有权限
//this.accessDecisionManager.decide(authenticated, object, attributes);
// System.err.println(" --------------- MySecurityFilter invoke--------------- ");
InterceptorStatusToken token = super.beforeInvocation(fi);
try {
fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
} finally {
super.afterInvocation(token, null);
}
}
public void init(FilterConfig arg0) throws ServletException {
}
public void destroy() {
}
@Override
public Class<? extends Object> getSecureObjectClass() {
//下面的MyAccessDecisionManager的supports方面必须放回true,否则会提醒类型错误
return FilterInvocation.class;
}
}