package net.mingsoft.config;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.mgt.SecurityManager;
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.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;

import com.mingsoft.basic.configurer.ShiroTagFreeMarkderConfigurer;

import net.mingsoft.basic.security.BaseAuthRealm;


@Configuration
public class ShiroConfig {

	@Value("managerPath")
	private String managerPath;
	
	@Bean
	public ShiroTagFreeMarkderConfigurer freemarkerConfig() {
		return new ShiroTagFreeMarkderConfigurer();
	}

	@Bean
	public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager) {
		ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
		shiroFilterFactoryBean.setSecurityManager(securityManager);
		// 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，因为前端模板采用了thymeleaf，这里不能直接使用 ("/static/**",
		// "anon")来配置匿名访问，必须配置到每个静态目录
		filterChainDefinitionMap.put("/static/**", "anon");
		filterChainDefinitionMap.put("/html/**", "anon");
		filterChainDefinitionMap.put(managerPath+"/checkLogin.do", "anon");
		filterChainDefinitionMap.put(managerPath+"/login.do", "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("/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("/**", "anon");
		// 如果不设置默认会自动寻找Web工程根目录下的"/login.jsp"页面
		shiroFilterFactoryBean.setLoginUrl("/login");
		// 登录成功后要跳转的链接
		shiroFilterFactoryBean.setSuccessUrl("/index");

		// 未授权界面;
		shiroFilterFactoryBean.setUnauthorizedUrl("/403");
		shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
		return shiroFilterFactoryBean;
	}

	/**
	 * 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(2);// 散列的次数，比如散列两次，相当于
														// md5(md5(""));
		return hashedCredentialsMatcher;
	}

	@Bean
	public BaseAuthRealm myShiroRealm() {
		BaseAuthRealm myShiroRealm = new BaseAuthRealm();
		myShiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
		return myShiroRealm;
	}

	@Bean
	public SecurityManager securityManager() {
		DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
		securityManager.setRealm(myShiroRealm());
		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(SecurityManager 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", "/user/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;
	}
}