package com.genersoft.iot.vmp.conf;
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import com.genersoft.iot.vmp.media.zlm.dto.IMediaServerItem;
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import com.genersoft.iot.vmp.service.IMediaServerService;
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import org.apache.catalina.connector.ClientAbortException;
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import org.apache.http.HttpHost;
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import org.apache.http.HttpRequest;
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import org.apache.http.HttpResponse;
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import org.mitre.dsmiley.httpproxy.ProxyServlet;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.boot.web.servlet.ServletRegistrationBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.util.StringUtils;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import java.io.IOException;
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import java.net.ConnectException;
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@SuppressWarnings(value = {"rawtypes", "unchecked"})
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@Configuration
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public class ProxyServletConfig {
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private final static Logger logger = LoggerFactory.getLogger(ProxyServletConfig.class);
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@Autowired
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private IMediaServerService mediaServerService;
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@Value("${server.port}")
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private int serverPort;
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@Bean
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public ServletRegistrationBean zlmServletRegistrationBean(){
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ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ZLMProxySerlet(),"/zlm/*");
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servletRegistrationBean.setName("zlm_Proxy");
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servletRegistrationBean.addInitParameter("targetUri", "http://127.0.0.1:6080");
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servletRegistrationBean.addUrlMappings();
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if (logger.isDebugEnabled()) {
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servletRegistrationBean.addInitParameter("log", "true");
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}
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return servletRegistrationBean;
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}
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class ZLMProxySerlet extends ProxyServlet{
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@Override
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protected String rewriteQueryStringFromRequest(HttpServletRequest servletRequest, String queryString) {
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String queryStr = super.rewriteQueryStringFromRequest(servletRequest, queryString);
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IMediaServerItem mediaInfo = getMediaInfoByUri(servletRequest.getRequestURI());
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if (mediaInfo != null) {
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if (!StringUtils.isEmpty(queryStr)) {
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queryStr += "&secret=" + mediaInfo.getSecret();
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}else {
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queryStr = "secret=" + mediaInfo.getSecret();
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}
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}
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return queryStr;
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}
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/**
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* 异常处理
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*/
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@Override
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protected void handleRequestException(HttpRequest proxyRequest, HttpResponse proxyResonse, Exception e){
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try {
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super.handleRequestException(proxyRequest, proxyResonse, e);
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} catch (ServletException servletException) {
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logger.error("zlm 代理失败： ", e);
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} catch (IOException ioException) {
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if (ioException instanceof ConnectException) {
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logger.error("zlm 连接失败");
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} else if (ioException instanceof ClientAbortException) {
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logger.error("用户已中断连接，代理终止");
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} else {
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logger.error("zlm 代理失败： ", e);
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}
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} catch (RuntimeException exception){
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logger.error("zlm 代理失败： ", e);
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}
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}
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/**
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* 对于为按照格式请求的可以直接返回404
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*/
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@Override
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protected String getTargetUri(HttpServletRequest servletRequest) {
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String requestURI = servletRequest.getRequestURI();
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IMediaServerItem mediaInfo = getMediaInfoByUri(requestURI);
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String uri = null;
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if (mediaInfo != null) {
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// String realRequestURI = requestURI.substring(requestURI.indexOf(mediaInfo.getId())+ mediaInfo.getId().length());
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uri = String.format("http://%s:%s", mediaInfo.getIp(), mediaInfo.getHttpPort());
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}else {
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uri = "http://127.0.0.1:" + serverPort +"/index/hook/null"; // 只是一个能返回404的请求而已， 其他的也可以
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}
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return uri;
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}
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/**
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* 动态替换请求目标
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*/
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@Override
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protected HttpHost getTargetHost(HttpServletRequest servletRequest) {
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String requestURI = servletRequest.getRequestURI();
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IMediaServerItem mediaInfo = getMediaInfoByUri(requestURI);
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HttpHost host;
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if (mediaInfo != null) {
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host = new HttpHost(mediaInfo.getIp(), mediaInfo.getHttpPort());
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}else {
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host = new HttpHost("127.0.0.1", serverPort);
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}
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return host;
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}
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/**
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* 根据uri获取流媒体信息
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*/
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IMediaServerItem getMediaInfoByUri(String uri){
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String[] split = uri.split("/");
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String mediaServerId = split[2];
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return mediaServerService.getOne(mediaServerId);
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}
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/**
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* 去掉url中的标志信息
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*/
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@Override
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protected String rewriteUrlFromRequest(HttpServletRequest servletRequest) {
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String requestURI = servletRequest.getRequestURI();
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IMediaServerItem mediaInfo = getMediaInfoByUri(requestURI);
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String url = super.rewriteUrlFromRequest(servletRequest);
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if (mediaInfo == null) {
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return url;
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}
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return url.replace(mediaInfo.getId() + "/", "");
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}
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}
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}
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