自定义shiro实现权限验证方法isAccessAllowed

由于Shiro filterChainDefinitions中 roles默认是and， admin= user,roles[system,general] 
比如：roles[system,general] ，表示同时需要“system”和“general” 2个角色（权限）才通过认证，缺一不可。
但是在实际业务中，一个端口往往同时对几个角色开放。比如管理员账号拥有访问所有端口的权限。那么此时的and显然是不合时宜的，与之替代的是or

一、重新实现AuthorizationFilter类

import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authz.AuthorizationFilter;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * @Auther: lanhaifeng
 * @Date: 2019/4/18 0018 17:40
 * @Description:支持多角色验证
 * 由于Shiro filterChainDefinitions中 roles默认是and，
 * = user,roles[system,general]
 * 比如：roles[system,general] ，表示同时需要“system”和“general” 2个角色才通过认证
 * 但是在实际业务中，一个端口的权限往往对多个角色开放（比如管理员可以使用一切权利）
 */
public class MyRolesAuthorizationFilter extends AuthorizationFilter{

    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue)
            throws Exception {
        Subject subject = getSubject(request, response);
        String[] rolesArray = (String[]) mappedValue;
        //没有权限访问
        if (rolesArray == null || rolesArray.length == 0) {
            return true;
        }
        for (int i = 0; i < rolesArray.length; i++) {
            //若当前用户是rolesArray中的任何一个，则有权限访问
            if (subject.hasRole(rolesArray[i])) {
                return true;
            }
        }
        return false;
    }
}

二、在ShiroConfig引用，其实spring boot集成shiro也就这两步，加上自定义权限验证 和自定义登录验证。

import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;
import javax.servlet.Filter;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

@Configuration
public class ShiroConfig {

    @Bean
    public ShiroFilterFactoryBean shirFilter(DefaultWebSecurityManager securityManager) {
        //System.out.println("ShiroConfiguration.shirFilter()");
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        shiroFilterFactoryBean.setSecurityManager(securityManager);
        //添加自定义验证方法,注意这个Filter继承javax.servlet.Filter
        Map<String, Filter> filterMap=new HashMap<>();
        filterMap.put("rolesOr",roleFilter());
        shiroFilterFactoryBean.setFilters(filterMap);
        //拦截器.
        Map<String,String> filterChainDefinitionMap = new LinkedHashMap<String,String>();
        // 配置不会被拦截的链接 顺序判断
        filterChainDefinitionMap.put("/static/**", "anon");
        filterChainDefinitionMap.put("/gif/**", "anon");
        //配置退出 过滤器,其中的具体的退出代码Shiro已经替我们实现了
        filterChainDefinitionMap.put("/sanyi/logout", "logout");
        //<!-- 过滤链定义，从上向下顺序执行，一般将/**放在最为下边 -->:这是一个坑呢，一不小心代码就不好使了;
        //<!-- authc:所有url都必须认证通过才可以访问; anon:所有url都都可以匿名访问-->
        filterChainDefinitionMap.put("/sanyi/index", "anon")；/*swagger*/
        filterChainDefinitionMap.put("/swagger-ui.html", "anon");
        filterChainDefinitionMap.put("/swagger-resources/**", "anon");
        filterChainDefinitionMap.put("/v2/**", "anon");
        filterChainDefinitionMap.put("/webjars/**", "anon");
        /*business业务端(1管理员，3业务员)*/
        filterChainDefinitionMap.put("/contract/base/**", "authc,rolesOr[1,3]");
　　　　　/*其他,一定要采取白名单*/
        filterChainDefinitionMap.put("/**", "authc");
        // 如果不设置默认会自动寻找Web工程根目录下的"/login"页面
        shiroFilterFactoryBean.setLoginUrl("/sanyi/index");
        // 登录成功后要跳转的链接
        shiroFilterFactoryBean.setSuccessUrl("/");
        //未授权界面;
        shiroFilterFactoryBean.setUnauthorizedUrl("/sanyi/nopermission");
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactoryBean;
    }

    @Bean
    public MyRolesAuthorizationFilter roleFilter(){
        MyRolesAuthorizationFilter roleFilter=new MyRolesAuthorizationFilter();
        return roleFilter;
    }

    /**
     * 密码凭证匹配器
     * （由于我们的密码校验交给Shiro的SimpleAuthenticationInfo进行处理了
     * ）
     * @return
     */
    @Bean
    public HashedCredentialsMatcher hashedCredentialsMatcher(){
        HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher();
        hashedCredentialsMatcher.setHashAlgorithmName("md5");//散列算法:这里使用MD5算法;
        hashedCredentialsMatcher.setHashIterations(10);//散列的次数10哈哈;
        return hashedCredentialsMatcher;
    }

    /**
     * 身份认证realm; (这个需要自己写，账号密码校验；权限等)
     * @return
     */
    @Bean
    public MyShiroRealm myShiroRealm(){
        MyShiroRealm myShiroRealm = new MyShiroRealm();
        myShiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
        return myShiroRealm;
    }

    /**
     * 会话管理器
     * @return
     */
    @Bean
    public DefaultWebSessionManager sessionManager(){
        DefaultWebSessionManager sessionManager=new DefaultWebSessionManager();
        sessionManager.setGlobalSessionTimeout(1800000);//单位是ms
        return sessionManager;
    }

    @Bean
    public DefaultWebSecurityManager securityManager(){
        DefaultWebSecurityManager securityManager =  new DefaultWebSecurityManager();
        securityManager.setRealm(myShiroRealm());
        securityManager.setSessionManager(sessionManager());
        return securityManager;
    }

    /**
     *  开启shiro aop注解支持.
     *  使用代理方式;所以需要开启代码支持;
     * @param securityManager
     * @return
     */
    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(DefaultWebSecurityManager securityManager){
        AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
        authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
        return authorizationAttributeSourceAdvisor;
    }

    @Bean(name="simpleMappingExceptionResolver")
    public SimpleMappingExceptionResolver
    createSimpleMappingExceptionResolver() {
        SimpleMappingExceptionResolver r = new SimpleMappingExceptionResolver();
        Properties mappings = new Properties();
        mappings.setProperty("DatabaseException", "databaseError");//数据库异常处理
        mappings.setProperty("UnauthorizedException","403");
        r.setExceptionMappings(mappings);  // None by default
        r.setDefaultErrorView("error");    // No default
        r.setExceptionAttribute("exception");     // Default is "exception"
        //r.setWarnLogCategory("example.MvcLogger");     // No default
        return r;
    }

}