package com.dsh.course.util;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Component
public class TokenUtil {

    @Autowired
    private RedisUtil redisUtil;


    public Integer getUserIdFormRedis() throws Exception {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = servletRequestAttributes.getRequest();
        String requestHeader = request.getHeader("Authorization");
        if (requestHeader != null && requestHeader.startsWith("Bearer ")) {
            requestHeader = requestHeader.substring(requestHeader.indexOf(" ") + 1);
            String key = null;
            int length = requestHeader.length();
            if (length > 32) {
                key = requestHeader.substring(length - 32);
            } else {
                key = requestHeader;
            }
            String value = redisUtil.getValue(key);
            return null != value ? Integer.valueOf(value) : null;
        } else {
            return null;
        }
    }
}