Spring Security-利用URL地址进行权限控制

目的是：系统内存在很多不同的用户，每个用户具有不同的资源访问权限，具体表现就是某个用户对于某个URL是无权限访问的。需要Spring Security忙我们过滤。

参考：http://www.cnblogs.com/quyixuanblog/p/5213503.html

本文的很多命名都是参考链接博文的，最大的不同应该是本文是基于Spring boot，再次也向前人致敬！

由上一篇可知，FilterSecurityInterceptor是Spring Security进行URL权限判断的，FilterSecurityInterceptor又继承于AbstractSecurityInterceptor，由此可推测，我们可以新增一个Interceptor继承AbstractSecurityInterceptor，实现我们自己的权限校验逻辑。

查看父类及其代码逻辑，有几点必须要注意：

1、主要鉴权方法是调用父类中accessDecisionManager的decide值，所以我们需要自己实现一个accessDecisionManager

2、父类中存在抽象方法public abstract SecurityMetadataSource obtainSecurityMetadataSource();作用是获取URL及用户角色对应的关系。我们需要加入自己的实现。

以下是部分代码实现

主要拦截器JwtUrlSecurityInterceptor，需要在WebSecurityConfig(Spring Security配置)文件中注册

  //这个拦截器用来实现按照用户权限，对所请求的url进行拦截
    @Bean
    public JwtUrlSecurityInterceptor jwtUrlSecurityInterceptorBean() throws Exception{
        return new JwtUrlSecurityInterceptor();
    }
@Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
...
        httpSecurity.addFilterBefore(jwtUrlSecurityInterceptorBean(), FilterSecurityInterceptor.class);
...
    }

实现自定义的accessDecisionManager

package org.zerhusen.security.dsuri;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import java.util.Collection;
/**
 * Created by dingshuo on 2017/6/28.
 */
public class MyAccessDecisionManager implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        System.out.println("自定义的接口");
        throw new AccessDeniedException("no right");
    }
    @Override
    public boolean supports(ConfigAttribute attribute) {
        return true;
    }
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}

实现自定义的资源SecurityMetadataSource 

package org.zerhusen.security.dsuri;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import java.util.*;
/**
 * Created by dingshuo on 2017/6/28.
 */
public class MyInvocationSecurityMetadataSource implements FilterInvocationSecurityMetadataSource {
    private static Map<String, Collection<ConfigAttribute>> resourceMap = null;
    @Autowired
    UrlMatcher urlMatcher;
    public MyInvocationSecurityMetadataSource() {
//这里可以查数据库实现
//注入dao即可
        resourceMap = new HashMap<String, Collection<ConfigAttribute>>();
        Collection<ConfigAttribute> atts = new ArrayList<ConfigAttribute>();
        ConfigAttribute ca = new SecurityConfig("ROLE_USER1");
        atts.add(ca);
        resourceMap.put("/index.jsp", atts);
        Collection<ConfigAttribute> attsno =new ArrayList<ConfigAttribute>();
        ConfigAttribute cano = new SecurityConfig("ROLE_NO");
        attsno.add(cano);
        resourceMap.put("/other.jsp", attsno);
    }
    @Override
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        String url = ((FilterInvocation)object).getRequestUrl();
        Iterator<String> ite = resourceMap.keySet().iterator();
        while (ite.hasNext()) {
            String resURL = ite.next();
            if (url.equals("/protected")) {
                return resourceMap.get(resURL);
            }
        }
        return null;
    }
    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}

实现JwtUrlSecurityInterceptor

package org.zerhusen.security.dsuri;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.security.access.AccessDecisionManager;
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 javax.servlet.*;
import java.io.IOException;
/**
 * Created by dingshuo on 2017/6/28.
 */
public class JwtUrlSecurityInterceptor extends AbstractSecurityInterceptor implements
        Filter {
    @Autowired
    public void  setMyAccessDecisionManager(){
        super.setAccessDecisionManager(myAccessDecisionManagerBean());
    }
    @Bean
    public MyAccessDecisionManager myAccessDecisionManagerBean(){
        return new MyAccessDecisionManager();
    }
    @Bean
    public MyInvocationSecurityMetadataSource myInvocationSecurityMetadataSourceBean(){
        return new MyInvocationSecurityMetadataSource();
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        FilterInvocation fi = new FilterInvocation(request, response, chain);
        invoke(fi);
    }
    @Override
    public void destroy() {
    }
    @Override
    public Class<?> getSecureObjectClass() {
        return FilterInvocation.class;
    }
    @Override
    public SecurityMetadataSource obtainSecurityMetadataSource() {
        return this.myInvocationSecurityMetadataSourceBean();
    }
    public void invoke(FilterInvocation fi) throws IOException, ServletException {
        InterceptorStatusToken token = super.beforeInvocation(fi);
        try {
            fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
        }finally {
            super.afterInvocation(token, null);
        }
    }
}

如上是简单的URL权限控制