package cn.exrick.xboot.core.config.security.validate;

import cn.exrick.xboot.core.common.constant.SettingConstant;
import cn.exrick.xboot.core.common.redis.RedisTemplateHelper;
import cn.exrick.xboot.core.common.utils.IpInfoUtil;
import cn.exrick.xboot.core.common.utils.ResponseUtil;
import cn.exrick.xboot.core.config.properties.CaptchaProperties;
import cn.exrick.xboot.core.entity.Setting;
import cn.exrick.xboot.core.service.SettingService;
import cn.exrick.xboot.core.vo.VaptchaSetting;
import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HttpUtil;
import com.google.gson.Gson;
import com.google.gson.JsonParser;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.PathMatcher;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 图形验证码过滤器
 * @author Exrick
 */
@Slf4j
@Configuration
public class VaptchaValidateFilter extends OncePerRequestFilter {

    @Autowired
    private CaptchaProperties captchaProperties;

    @Autowired
    private SettingService settingService;

    @Autowired
    private IpInfoUtil ipInfoUtil;

    @Autowired
    private PathMatcher pathMatcher;

    @Autowired
    private RedisTemplateHelper redisTemplate;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {

        // 判断URL是否需要验证
        Boolean flag = false;
        String requestUrl = request.getRequestURI();
        for (String url : captchaProperties.getVaptcha()) {
            if (pathMatcher.match(url, requestUrl)) {
                flag = true;
                break;
            }
        }
        if (flag) {
            String token = request.getParameter("token");
            if (StrUtil.isBlank(token)) {
                ResponseUtil.out(response, ResponseUtil.resultMap(false, 500, "请传入Vaptcha验证码所需参数token"));
                return;
            }
            String mode = token.substring(0, 7);
            if (SettingConstant.OFFLINE_MODE.equals(mode)) {
                // 离线模式 中间32位为knock
                String knock = token.substring(7, 39);
                String sessionToken = redisTemplate.get(knock);
                // 最后为uuid
                String uuid = token.substring(39);
                if (StrUtil.isBlank(sessionToken) || !uuid.equals(sessionToken)) {
                    ResponseUtil.out(response, ResponseUtil.resultMap(false, 500, "Vaptcha验证码验证失败"));
                    return;
                }
                // 验证成功 放行
                chain.doFilter(request, response);
                return;
            } else {
                Setting setting = settingService.get(SettingConstant.VAPTCHA_SETTING);
                if (StrUtil.isBlank(setting.getValue())) {
                    ResponseUtil.out(response, ResponseUtil.resultMap(false, 500, "系统还未配置Vaptcha验证码，请联系管理员"));
                    return;
                }
                VaptchaSetting vs = new Gson().fromJson(setting.getValue(), VaptchaSetting.class);
                // 验证vaptcha验证码
                String params = "id=" + vs.getVid() + "&secretkey=" + vs.getSecretKey() + "&token=" + token
                        + "&ip=" + ipInfoUtil.getIpAddr(request);
                String result = HttpUtil.post(SettingConstant.VAPTCHA_URL, params);
                int success = JsonParser.parseString(result).getAsJsonObject().get("success").getAsInt();
                if (success != 1) {
                    ResponseUtil.out(response, ResponseUtil.resultMap(false, 500, "Vaptcha验证码验证失败"));
                    return;
                }
                // 验证成功 放行
                chain.doFilter(request, response);
                return;
            }
        }
        // 无需验证 放行
        chain.doFilter(request, response);
    }
}