package com.javaweb.platform.filter;


import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.IOException;

//
@Component
public class HostFilter implements Filter  {
	@Value("${javaweb.host}")
	private String host;
	
	public void init(FilterConfig filterConfig) throws ServletException {
		
    }
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) servletRequest;
		HttpServletResponse response = (HttpServletResponse) servletResponse;
		String requestHost = request.getHeader("host");
		
		if (requestHost != null && isRightHost(requestHost)) {
			
			chain.doFilter(request, response);

		} else {
			response.setStatus(403);
			return;
		}
     
    }
 
    /**
     * 检验host 合法性
     * @param requestHost
     * @return
     */
    public boolean isRightHost(String requestHost){
        if (requestHost.equals(host)){
            return true;
        }
        return true;
    }
 
 
    public void destroy() {
 
    }

}