package com.yaoxx.base.shiro;

import java.io.PrintWriter;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.web.filter.authc.FormAuthenticationFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.http.HttpStatus;

/**
*  
* @version: 1.0
* @since: JDK 1.8.0_91
* @Description:
* 		未登錄過濾器，重寫方法為【跨域的預(yù)檢訪問】放行

*/

public class MyAuthenticationFilter extends FormAuthenticationFilter {
   
   @Override
   protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
   	boolean allowed = super.isAccessAllowed(request, response, mappedValue);
   	if (!allowed) {
   		// 判斷請(qǐng)求是否是options請(qǐng)求
   		String method = WebUtils.toHttp(request).getMethod();
   		if (StringUtils.equalsIgnoreCase("OPTIONS", method)) {
   			return true;
   		}
   	}
   	return allowed;
   }

   @Override
   protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
   	if (isLoginRequest(request, response)) { // 判斷是否登錄
   		if (isLoginSubmission(request, response)) { // 判斷是否為post訪問
   			return executeLogin(request, response);
   		} else {
   			// sessionID已經(jīng)注冊(cè),但是并沒有使用post方式提交
   			return true;
   		}
   	} else {
   		HttpServletRequest req = (HttpServletRequest) request;
   		HttpServletResponse resp = (HttpServletResponse) response;
   		/*
   		 * 跨域訪問有時(shí)會(huì)先發(fā)起一條不帶token，不帶cookie的訪問。
   		 * 這就需要我們抓取這條訪問，然后給他通過，否則只要是跨域的訪問都會(huì)因?yàn)槲吹卿浕蛉鄙贆?quán)限而被攔截
   		 * （如果重寫了isAccessAllowed，就無需下面的判斷）
   		 */
//			if (req.getMethod().equals(RequestMethod.OPTIONS.name())) {
//				resp.setStatus(HttpStatus.OK.value());
//				return true;
//			}
   		/*
   		 * 跨域的第二次請(qǐng)求就是普通情況的request了，在這對(duì)他進(jìn)行攔截
   		 */
   		String ajaxHeader = req.getHeader(CustomSessionManager.AUTHORIZATION);
   		if (StringUtils.isNotBlank(ajaxHeader)) {
   			// 前端Ajax請(qǐng)求，則不會(huì)重定向
   			resp.setHeader("Access-Control-Allow-Origin", req.getHeader("Origin"));
   			resp.setHeader("Access-Control-Allow-Credentials", "true");
   			resp.setContentType("application/json; charset=utf-8");
   			resp.setCharacterEncoding("UTF-8");
   			resp.setStatus(HttpStatus.UNAUTHORIZED.value());//設(shè)置未登錄狀態(tài)碼
   			PrintWriter out = resp.getWriter();
//				Map<String, String> result = new HashMap<>();
//				result.put("MESSAGE", "未登錄用戶");
   			String result = "{"MESSAGE":"未登錄用戶"}";
   			out.println(result);
   			out.flush();
   			out.close();
   		} else {
   			// == 如果是普通訪問重定向至shiro配置的登錄頁面 == //
   			saveRequestAndRedirectToLogin(request, response);
   		}
   	}
   	return false;
   }
}

package com.yaoxx.base.shiro;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.web.filter.authz.RolesAuthorizationFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

/**
* 
* @author: yao_x_x
* @since: JDK 1.8.0_91
* @Description: role的過濾器
*/

public class MyAuthorizationFilter extends RolesAuthorizationFilter {

   @Override
   public boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue)
   		throws IOException {
   	boolean allowed =super.isAccessAllowed(request, response, mappedValue);
   	if (!allowed) {
   		String method = WebUtils.toHttp(request).getMethod();
   		if (StringUtils.equalsIgnoreCase("OPTIONS", method)) {
   			return true;
   		}
   	}
   	return allowed;
   }

   @Override
   protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws IOException {
   	HttpServletRequest req = (HttpServletRequest) request;
   	HttpServletResponse resp = (HttpServletResponse) response;
   	if (req.getMethod().equals(RequestMethod.OPTIONS.name())) {
   		resp.setStatus(HttpStatus.OK.value());
   		return true;
   	}
   	// 前端Ajax請(qǐng)求時(shí)requestHeader里面帶一些參數(shù)，用于判斷是否是前端的請(qǐng)求
   	String ajaxHeader = req.getHeader(CustomSessionManager.AUTHORIZATION);
   	if (StringUtils.isNotBlank(ajaxHeader)) {
   		// 前端Ajax請(qǐng)求，則不會(huì)重定向
   		resp.setHeader("Access-Control-Allow-Origin", req.getHeader("Origin"));
   		resp.setHeader("Access-Control-Allow-Credentials", "true");
   		resp.setContentType("application/json; charset=utf-8");
   		resp.setCharacterEncoding("UTF-8");
   		PrintWriter out = resp.getWriter();
   		String result = "{"MESSAGE":"角色，權(quán)限不足"}";
   		out.println(result);
   		out.flush();
   		out.close();
   		return false;
   	}
   	return super.onAccessDenied(request, response);
   }
}

@Configuration
public class ShiroConfiguration {
	
	@Autowired
	private RoleService roleService;
	@Autowired
	private PermissionService permissionService;
	
	
	
	
	@Bean("shiroFilter")
	public ShiroFilterFactoryBean shiroFilter(@Qualifier("securityManager")SecurityManager manager) {
		ShiroFilterFactoryBean bean = new ShiroFilterFactoryBean();
		bean.setSecurityManager(manager);
		/* 自定義filter注冊(cè) */
		Map<String, Filter> filters = bean.getFilters(); 
		filters.put("authc", new MyAuthenticationFilter());
		filters.put("roles", new MyAuthorizationFilter());

		
		Map<String, String> filterChainDefinitionMap =new LinkedHashMap<>();
		filterChainDefinitionMap.put("/login", "anon");
//		filterChainDefinitionMap.put("/*", "authc");
//		filterChainDefinitionMap.put("/admin", "authc,roles[ADMIN]");
		bean.setFilterChainDefinitionMap(filterChainDefinitionMap);
		
		return bean;
	}