package com.stone.conf.filter;

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONObject;
import com.stone.api.enums.ResultCode;
import com.stone.conf.redis.RedisHelper;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authc.FormAuthenticationFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

/**
 * 对没有登录的请求进行拦截, 全部返回json信息.
 * 覆盖掉shiro原本的跳转login.jsp的拦截方式
 */
public class AjaxPermissionsAuthorizationFilter extends FormAuthenticationFilter {

    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) {
        if ("OPTIONS".equals(WebUtils.toHttp(request).getMethod())) {
            return true;
        }
        String token = WebUtils.toHttp(request).getHeader("Authorization");
        if (StrUtil.isEmpty(token) || (StrUtil.isNotEmpty(token) && !RedisHelper.exists(token))) {
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("returnCode", 20011);
            jsonObject.put("returnMsg", "用户未登录");
            PrintWriter out = null;
            HttpServletResponse res = (HttpServletResponse) response;
            // 接下来的几句话是个坑，一定要加上，跨域访问才可以正常退出。
            res.setHeader("Access-Control-Allow-Origin", ((HttpServletRequest) request).getHeader("Origin"));
            res.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
            res.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE");
            res.setHeader("Access-Control-Allow-Credentials", "true");
            try {
                res.setCharacterEncoding("UTF-8");
                res.setContentType("application/json");
                out = response.getWriter();
                out.println(jsonObject);
            } catch (Exception ignored) {
            } finally {
                if (out != null) {
                    out.flush();
                    out.close();
                }
            }
            return false;
        }
        return true;
    }

    @Bean
    public FilterRegistrationBean<AjaxPermissionsAuthorizationFilter> registration(AjaxPermissionsAuthorizationFilter filter) {
        FilterRegistrationBean<AjaxPermissionsAuthorizationFilter> registration = new FilterRegistrationBean<>(filter);
        registration.setEnabled(false);
        return registration;
    }

}