package com.common.filter;

import com.common.annotation.NoToken;
import com.common.core.utils.JwtTokenUtil;
import com.common.core.utils.SpringContextUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationServiceException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
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.*;
import java.util.stream.Collectors;


/**
 * @author 廖振钦
 * @date 2022-01-17
 */
@Slf4j
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter
{
    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {
        Map<RequestMappingInfo, HandlerMethod> handlerMethods = ((RequestMappingHandlerMapping)SpringContextUtils.getBean("requestMappingHandlerMapping")).getHandlerMethods();
        Set<String> anonymousUrls = new HashSet<>();
        for (Map.Entry<RequestMappingInfo, HandlerMethod> infoEntry : handlerMethods.entrySet()) {
            // 获取所有接口的方法
            HandlerMethod handlerMethod = infoEntry.getValue();
            if ( handlerMethod.hasMethodAnnotation(NoToken.class)) {
                final PatternsRequestCondition requestCondition = infoEntry.getKey().getPatternsCondition();
                Optional.ofNullable(requestCondition).orElseThrow(RuntimeException::new);
                anonymousUrls.addAll(requestCondition.getPatterns().stream().map(m -> SpringContextUtils.getEnvParam("server.servlet.context-path")+m).collect(Collectors.toList()));
            }
        }

        String uri = request.getRequestURI();
        boolean visit = true;
        for(String item : Arrays.asList(new String[]{
                ".html",
                ".css",
                ".js",
                ".png",
                ".ttf",
                ".ico",
                ".woff",
                "/swagger-resources",
                "/v2/api-docs",
                "/druid"
        })){
            if(uri.contains(item)){
                visit = false;
            }
        }
        if(!anonymousUrls.contains(uri) && !HttpMethod.OPTIONS.matches(request.getMethod()) && visit) {
            String token = request.getHeader("pi-token");
            log.info("TOKEN:"+token);
            if(StringUtils.isEmpty(token)){
                throw new AuthenticationServiceException("TOKEN为空");
            }
            String appid = jwtTokenUtil.getAppidFromToken(token);
            if (appid != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(appid);
                if (jwtTokenUtil.validateToken(token, userDetails)) {
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }else{
                    throw new AuthenticationServiceException("TOKEN无效");
                }
            }
        }
        chain.doFilter(request,response);
    }
}