package com.vincent.rsf.server.common.security;

import com.vincent.rsf.framework.common.Cools;
import com.vincent.rsf.server.common.config.ConfigProperties;
import com.vincent.rsf.server.common.constant.Constants;
import com.vincent.rsf.server.common.utils.CommonUtil;
import com.vincent.rsf.server.common.utils.JwtUtil;
import com.vincent.rsf.server.system.entity.Menu;
import com.vincent.rsf.server.system.entity.User;
import com.vincent.rsf.server.system.entity.UserLogin;
import com.vincent.rsf.server.system.service.UserLoginService;
import com.vincent.rsf.server.system.service.UserService;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.annotation.Resource;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 处理携带token的请求过滤器
 *
 */
@Slf4j
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    public static final ArrayList<String> WHITE_KEY = new ArrayList<String>(){
        private static final long serialVersionUID = 1L;
        {
            add("xltys1995");
        }
    };

    @Resource
    private ConfigProperties configProperties;
    @Resource
    private UserService userService;
    @Resource
    private UserLoginService userLoginService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {
        String access_token = JwtUtil.getAccessToken(request);
        for (String filterPath : SecurityConfig.FILTER_PATH) {
            AntPathRequestMatcher antPathMatcher = new AntPathRequestMatcher(filterPath);
            if (antPathMatcher.matches(request)) {
                access_token = "";
            }
        }
        if (!Cools.isEmpty(access_token)) {
            try {
                User user;
                if (WHITE_KEY.contains(access_token)) {
                    user = userService.getByUsername("root", 1L);
                    if (user == null) {
                        throw new UsernameNotFoundException("Username not found");
                    }
                    userService.setUserAuthInfo(user);
                    List<Menu> authorities = user.getAuthorities().stream()
                            .filter(m -> !Cools.isEmpty(m.getAuthority())).collect(Collectors.toList());
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                            user, null, authorities);
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                } else {
                    // 解析token
                    Claims claims = JwtUtil.parseToken(access_token, configProperties.getTokenKey());
                    JwtSubject jwtSubject = JwtUtil.getJwtSubject(claims);
                    user = userService.getByUsername(jwtSubject.getUsername(), jwtSubject.getTenantId());
                    if (user == null) {
                        throw new UsernameNotFoundException("Username not found");
                    }
                    userService.setUserAuthInfo(user);
                    List<Menu> authorities = user.getAuthorities().stream()
                            .filter(m -> !Cools.isEmpty(m.getAuthority())).collect(Collectors.toList());
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                            user, null, authorities);
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                    // token将要过期签发新token, 防止突然退出登录
                    long expiration = (claims.getExpiration().getTime() - new Date().getTime()) / 1000 / 60;
                    if (expiration < configProperties.getTokenRefreshTime()) {
                        String token = JwtUtil.buildToken(jwtSubject, configProperties.getTokenExpireTime(),
                                configProperties.getTokenKey());
                        response.addHeader(Constants.TOKEN_HEADER_NAME, token);
                        userLoginService.saveAsync(user.getId(), token, UserLogin.TYPE_REFRESH, user.getTenantId(), null, request);
                    }
                }
            } catch (ExpiredJwtException e) {
                log.error("JwtAuthenticationFilter ExpiredJwtException", e);
                CommonUtil.responseError(response, Constants.TOKEN_EXPIRED_CODE, Constants.TOKEN_EXPIRED_MSG,
                        e.getMessage());
                return;
            } catch (Exception e) {
                log.error("JwtAuthenticationFilter", e);
                CommonUtil.responseError(response, Constants.BAD_CREDENTIALS_CODE, Constants.BAD_CREDENTIALS_MSG,
                        e.toString());
                return;
            }
        }
        chain.doFilter(request, response);
    }

}