package com.yuanchu.limslaboratory.shiro.config;

import com.yuanchu.limslaboratory.shiro.filter.JwtFilter;
import com.yuanchu.limslaboratory.shiro.MultiRealmAuthenticator;
import com.yuanchu.limslaboratory.shiro.realm.JwtRealm;
import com.yuanchu.limslaboratory.shiro.realm.ShiroRealm;
import com.yuanchu.limslaboratory.shiro.utils.JwtCredentialsMatcher;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authc.pam.AuthenticationStrategy;
import org.apache.shiro.authc.pam.FirstSuccessfulStrategy;
import org.apache.shiro.authc.pam.ModularRealmAuthenticator;
import org.apache.shiro.authz.Authorizer;
import org.apache.shiro.authz.ModularRealmAuthorizer;
import org.apache.shiro.crypto.hash.Md5Hash;
import org.apache.shiro.mgt.DefaultSessionStorageEvaluator;
import org.apache.shiro.mgt.DefaultSubjectDAO;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.mgt.SessionStorageEvaluator;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.spring.LifecycleBeanPostProcessor;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.Filter;
import java.util.*;

@Configuration
public class ShiroConfig {

    /**
     * 不向 Spring容器中注册 JwtFilter Bean，防止 Spring 将 JwtFilter 注册为全局过滤器
     * 全局过滤器会对所有请求进行拦截，而本例中只需要拦截除 /login 和 /logout 外的请求
     * 另一种简单做法是：直接去掉 jwtFilter()上的 @Bean 注解
     */
    @Bean
    public FilterRegistrationBean<Filter> registration(JwtFilter filter) {
        FilterRegistrationBean<Filter> registration = new FilterRegistrationBean<Filter>(filter);
        registration.setEnabled(false);
        return registration;
    }

    //ShiroFilter过滤所有请求
    @Bean
    public ShiroFilterFactoryBean getShiroFilterFactoryBean(SecurityManager securityManager) {
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        //给ShiroFilter配置安全管理器
        shiroFilterFactoryBean.setSecurityManager(securityManager);

        // 添加 jwt 专用过滤器，拦截除 /login 和 /logout 外的请求
        Map<String, Filter> filterMap = new LinkedHashMap<>();
        filterMap.put("jwtFilter", new JwtFilter());
        shiroFilterFactoryBean.setFilters(filterMap);

        //配置系统公共资源
        Map<String, String> map = new HashMap<String, String>();

        // swagger放行
        map.put("/doc.html", "anon");
        map.put("/webjars/**/**", "anon");
        map.put("/swagger-resources", "anon");
        map.put("/api-docs", "anon");
        map.put("/v3/**", "anon");


        map.put("/user/login/**","anon");//表示这个为公共资源 一定是在受限资源上面
//        map.put("/**","jwtFilter");//表示这个资源需要认证和授权

        shiroFilterFactoryBean.setFilterChainDefinitionMap(map);

        return shiroFilterFactoryBean;
    }

    /**
     * 配置 ModularRealmAuthenticator
     */
    @Bean
    public ModularRealmAuthenticator authenticator() {
        ModularRealmAuthenticator authenticator = new MultiRealmAuthenticator();
        // 设置多 Realm的认证策略，默认 AtLeastOneSuccessfulStrategy
        AuthenticationStrategy strategy = new FirstSuccessfulStrategy();
        authenticator.setAuthenticationStrategy(strategy);
        return authenticator;
    }


    /**
     * 禁用session, 不保存用户登录状态。保证每次请求都重新认证
     */
    @Bean
    protected SessionStorageEvaluator sessionStorageEvaluator() {
        DefaultSessionStorageEvaluator sessionStorageEvaluator = new DefaultSessionStorageEvaluator();
        sessionStorageEvaluator.setSessionStorageEnabled(false);
        return sessionStorageEvaluator;
    }

    /**
     * 配置 SecurityManager：权限管理器
     */
    @Bean
    public DefaultWebSecurityManager securityManager() {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();

        // 1.身份验证器
        securityManager.setAuthenticator(authenticator());

        // 2.管理Realm
        List<Realm> realms = new ArrayList<Realm>(16);
        realms.add(JwtRealm());
        realms.add(shiroRealm());
        securityManager.setRealms(realms); // 配置多个realm

        // 3.关闭shiro自带的session
        DefaultSubjectDAO subjectDAO = new DefaultSubjectDAO();
        subjectDAO.setSessionStorageEvaluator(sessionStorageEvaluator());
        securityManager.setSubjectDAO(subjectDAO);

        return securityManager;
    }

    //    创建自定义Realm
    @Bean
    public Realm shiroRealm() {
        ShiroRealm realm = new ShiroRealm();
//        HashedCredentialsMatcher credentialsMatcher = new HashedCredentialsMatcher();
////        //设置使用MD5加密算法
////        credentialsMatcher.setHashAlgorithmName(Md5Hash.ALGORITHM_NAME);
////        //散列次数
////        credentialsMatcher.setHashIterations(1024);
//        realm.setCredentialsMatcher(credentialsMatcher);
        return realm;
    }

    @Bean
    public Realm JwtRealm(){
        JwtRealm jwtRealm = new JwtRealm();
        // 设置加密算法
        CredentialsMatcher credentialsMatcher = new JwtCredentialsMatcher();
        // 设置加密次数
        jwtRealm.setCredentialsMatcher(credentialsMatcher);
        return jwtRealm;
    }


    // 以下三中bean通用，固定配置

    /**
     * 交由 Spring 来自动地管理 Shiro-Bean 的生命周期
     */
    @Bean
    public static LifecycleBeanPostProcessor getLifecycleBeanPostProcessor() {
        return new LifecycleBeanPostProcessor();
    }

    /**
     * 为 Spring-Bean 开启对 Shiro 注解的支持
     */
    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(SecurityManager securityManager) {
        AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
        authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
        return authorizationAttributeSourceAdvisor;
    }

    /**
     * 开启AOP方法级权限检查
     */
    @Bean
    public DefaultAdvisorAutoProxyCreator defaultAdvisorAutoProxyCreator() {
        DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator = new DefaultAdvisorAutoProxyCreator();
        advisorAutoProxyCreator.setProxyTargetClass(true);
        return advisorAutoProxyCreator;
    }
}