PHP implementation example of remote control server function using WeChat

WeChat development has been very popular recently. This article mainly shares with you examples of PH implementation of remote control server functions using WeChat. The general functions are still there, but they are not complete. I have not dealt with many places. But for communication in plain text, there is no problem.

Environment Construction

Let’s briefly talk about the principles of WeChat public accounts. Maybe my understanding is not in place. If there is something wrong, I welcome criticism and advice.

The client sends a request to the WeChat platform, and the WeChat platform forwards the request to the private server. After being handed over to the program for processing, the processing results of the private server are obtained and then fed back to the client.

Of course, the “WeChat Public Platform” plays a core role in this. It is equivalent to providing a stage, a platform that allows talented people and strangers to show their own characteristics. In fact, this is not only true for WeChat, but also for Alibaba, so that major e-commerce companies can show their talents.

Open configuration

The first step is to apply for a WeChat developer account. For individuals, it is enough to choose a subscription account. There is a lot of relevant information on the Internet and it is very detailed, so I won’t go into details. Let’s get straight to the point.

After successfully logging in to the developer account, you can open the server-side settings, as shown below

The activation is completed, and you can set it according to the situation of your own server. Can.

• URL is the address used by your private server to process request data

• TOKEN is a token, set it casually. But remember that you will use it in your own code later.

• As for the key, it has no major use, so you can leave it alone for now.

Setting on demand

After setting, you can enable it. This is like having all the wires in your home renovated and now you want to use them and press the switch. As shown below

Enable server configuration

Server environment

Regarding the server, the official website explains it in detail.

https://mp.weixin.qq.com/wiki

We can also download the official demo to simulate.

Official sample

The code is also very simple. Basically, anyone who has learned the basic syntax of PHP can understand it.

<?php /**
 * wechat php test
 */
//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();
class wechatCallbackapiTest
{
 public function valid()
 {
 $echoStr = $_GET["echostr"];
 //valid signature , option
 if($this->checkSignature()){
 echo $echoStr;
 exit;
 }
 }
 public function responseMsg()
 {
 //get post data, May be due to the different environments
 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
 //extract post data
 if (!empty($postStr)){
 /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
  the best way is to check the validity of xml by yourself */
 libxml_disable_entity_loader(true);
 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
 $fromUsername = $postObj->FromUserName;
 $toUsername = $postObj->ToUserName;
 $keyword = trim($postObj->Content);
 $time = time();
 $textTpl = "<xml>
  <tousername></tousername>
  <fromusername></fromusername>
  <createtime>%s</createtime>
  <msgtype></msgtype>
  <content></content>
  <funcflag>0</funcflag>
  </xml>"; 
 if(!empty( $keyword ))
 {
  $msgType = "text";
  $contentStr = "Welcome to wechat world!";
  $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
  echo $resultStr;
 }else{
  echo "Input something...";
 }
 }else {
 echo "";
 exit;
 }
 }
 private function checkSignature()
 {
 // you must define TOKEN by yourself
 if (!defined("TOKEN")) {
 throw new Exception('TOKEN is not defined!');
 }
 $signature = $_GET["signature"];
 $timestamp = $_GET["timestamp"];
 $nonce = $_GET["nonce"];
 $token = TOKEN;
 $tmpArr = array($token, $timestamp, $nonce);
 // use SORT_STRING rule
 sort($tmpArr, SORT_STRING);
 $tmpStr = implode( $tmpArr );
 $tmpStr = sha1( $tmpStr );
 if( $tmpStr == $signature ){
 return true;
 }else{
 return false;
 }
 }
}
?>

The core idea is nothing more than checking the signature, processing the request, and feeding back the results.

What I have to say here is that I think Tencent can actually remove those templates and directly expose the black box mode. In this case, the security will be higher. In many cases, the more open the permissions are, the worse the effect may be.

Core Class

The next step is my own processing logic, please refer to the official documentation. WeChat public has 6 receiving interfaces and three replying interfaces. It can be determined based on MsgType.

Interface details

Verification

private function checkSignature() {
 // you must define TOKEN by yourself
 if (! defined ( "TOKEN" )) {
 throw new Exception ( 'TOKEN is not defined!' );
 }
 $signature = $_GET ["signature"];
 $timestamp = $_GET ["timestamp"];
 $nonce = $_GET ["nonce"];
 $token = TOKEN;
 $tmpArr = array (
 $token,
 $timestamp,
 $nonce 
 );
 // use SORT_STRING rule
 sort ( $tmpArr, SORT_STRING );
 $tmpStr = implode ( $tmpArr );
 $tmpStr = sha1 ( $tmpStr );
 if ($tmpStr == $signature) {
 return true;
 } else {
 return false;
 }
 }

The core of the verification method works based on the TOKEN we set on the previous web page, so it will be used in the code.

Reply

The reply code needs to be treated differently according to the type of data sent by the client. The WeChat platform will package the data and encapsulate it. We need to call the internal MsgType. Just process it.

Expansion

The expansion part was added on my own whim.

Add a robot

Call a robot interface to send replies on your behalf. This skill allows users to have a good user experience and can also please the public. Why not?

I tested two interfaces here, one is curl mode and the other is file_get_contents mode, both of them are very easy to use.

<?php /**
 * 图灵 机器人接口
 * 
 * 使用curl来进行浏览器模拟并抓取数据
 */
function turing($requestStr) {
 // 图灵机器人接口
 $url = "http://www.tuling123.com/openapi/api";
 // 用于POST请求的数据
 $data = array(
 &#39;key&#39;=>"哈哈，这个key还是得你自己去申请的啦",
 'info'=>$requestStr,
 );
 // 构造curl下载器
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
 $responseStr = curl_exec($ch);
 curl_close($ch);
 return $responseStr;
}
/**
 * 调用另外的接口
 * @param unknown $req
 * @return mixed
 */
function test($req){
 $url = "http://api.qingyunke.com/api.php?key=free&appid=0&msg=".$req;
 $result = file_get_contents($url);
 $result = json_decode($result, true);
 return $result['content'];
}
$req = 'hello';
$res = test($req);
echo $res;

Command Mode

One of the great advantages of mobile phones over computers is their portability. Although we cannot carry computers anytime and anywhere, we can use mobile phones instead. Many times the commands required to manage the server are very simple, but it is inconvenient to log in remotely. It’s also a good idea to use WeChat to help spread the word at this time.

I usually like to use Python to write some scripts, such as getting local IP, chatting, checking memory, network speed, etc. It can be said that it has everything. This time it finally comes into play. By using WeChat's keyword matching, you can simply let the WeChat public account act as a small messenger.

Here is an idea, the specific implementation is relatively simple, just treat it as text.

Complete code

The complete code on my server is posted below. I have made some changes in some private parts. You can modify it according to your own situation.

valid();
// 调用回复信息方法
$wechatObj->responseMsg ();
// 微信消息处理核心类
class wechatCallbackapiTest {
 public function valid() {
 $echoStr = $_GET ["echostr"];
 // valid signature , option
 if ($this->checkSignature ()) {
 echo $echoStr;
 exit ();
 } else {
 echo "验证失败！";
 }
 }
 public function responseMsg() {
 // get post data, May be due to the different environments
 // 类似$_POST但是可以接受XML数据，属于增强型
 $postStr = $GLOBALS ["HTTP_RAW_POST_DATA"];
 // extract post data
 if (! empty ( $postStr )) {
 /*
 * libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
 * the best way is to check the validity of xml by yourself
 */
 // 不解析外部数据，防止xxml漏洞
 libxml_disable_entity_loader ( true );
 $postObj = simplexml_load_string ( $postStr, 'SimpleXMLElement', LIBXML_NOCDATA );
 $fromUsername = $postObj->FromUserName;
 $toUsername = $postObj->ToUserName;
 $keyword = trim ( $postObj->Content );
 $time = time ();
 /*
 * 微信客户端发送信息的时候会附带一些参数，详见官方文档。所以要根据不同的类型，来分别做相关的处理。
 * 于是MsgType 就充当这样的一个区分的标记
 */
 $msgType = $postObj->MsgType;
 /*
 * 当有用户关注后者退订的时候，会触发相应的事件。所以再来个event事件的监听更为友好。
 * $event = $postObj->Event.
 * 具体的参数信息，官网上很详细。
 */
 $event = $postObj->Event;
 switch ($msgType) {
 // 文本消息 处理部分
 case "text" :
  if (! empty ( $keyword )) {
  // 在此处进行对关键字的匹配就可以实现：针对不同关键字组装的相应数据
  if($keyword=='PHP implementation example of remote control server function using WeChat' || $keyword == "music") {
  $msgType = 'music';
  $musictitle = "The Mountain";
  $musicdescription = "夏日舒心清凉歌曲";
  $musicurl = "http://101.200.58.242/wx/themaintain.mp3";
  $hqmusicurl = "http://101.200.58.242/wx/themaintain.mp3";
  musicMessageHandle($fromUsername, $toUsername, $time, $msgType, $musictitle, $musicdescription, $musicurl, $hqmusicurl);
  }elseif($keyword == '1'){
  $msgType = 'text';
  $contentStr = "人生得意须尽欢，莫使金樽空对月！";
  textMessageHandle($fromUsername, $toUsername, $time, $msgType, $contentStr);
  }elseif($keyword == 'PHP implementation example of remote control server function using WeChat模式'){
  $msgType = 'text';
  $contentStr = "进入PHP implementation example of remote control server function using WeChat模式，开始对服务器进行管理！\n接下来将依据您输入的PHP implementation example of remote control server function using WeChat对服务器进行管理！";
  textMessageHandle($fromUsername, $toUsername, $time, $msgType, $contentStr);
  }else {
  // 直接调用 机器人接口，与用户进行交流
  $msgType = "text";
  $contentStr = turing($keyword)!=""?turing($keyword):"这里是微信 纯文本测试数据！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  }
  } else {
  echo "您得输入点数据，我才能回复不是！";
  }
  break;
 // 接收图片信息
 case "image" :
  if (! empty ( $keyword )) {
//  $msgType = "image";
  $contentStr = "您发送的图片看起来还真不错！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的图片！";
  }
  break;
 // 接收语音信息
 case "voice" :
  if (! empty ( $keyword )) {
//  $msgType = "voice";
  $contentStr = "您发送的语音听起来还真不错！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的语音！";
  }
  break;
 // 接收视频信息
 case "video" :
  if (! empty ( $keyword )) {
//  $msgType = "video";
  $contentStr = "您发送的视频看起来还真不错！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的视频！";
  }
  break;
 // 接收视频信息
 case "shortvideo" :
  if (! empty ( $keyword )) {
//  $msgType = "shortvideo";
  $contentStr = "您发送的小视频看起来还真不错！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的小视频！";
  }
  break;
 // 接收位置信息
 case "location" :
  if (! empty ( $keyword )) {
//  $msgType = "location";
  $contentStr = "您发送的位置已被接收！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的位置！";
  }
  break;
 // 接收视频信息
 case "link" :
  if (! empty ( $keyword )) {
//  $msgType = "link";
  $contentStr = "您发送的链接看起来还真不错！";
  textMessageHandle ( $fromUsername, $toUsername, $time, $msgType, $contentStr );
  } else {
  echo "服务器没能收到您发送的链接！";
  }
  break;
 // 对事件进行侦听
 case "event":
  switch ($event) {
  case "subscribe":
  // 发送一些消息！
  $msgType = 'text';
  $contentStr = "终于等到你！";
  textMessageHandle($fromUsername, $toUsername, $time, $msgType, $contentStr);
  break;
  }
  break;
 default :
  break;
 }
 } else {
 echo "";
 exit ();
 }
 }
 private function checkSignature() {
 // you must define TOKEN by yourself
 if (! defined ( "TOKEN" )) {
 throw new Exception ( 'TOKEN is not defined!' );
 }
 $signature = $_GET ["signature"];
 $timestamp = $_GET ["timestamp"];
 $nonce = $_GET ["nonce"];
 $token = TOKEN;
 $tmpArr = array (
 $token,
 $timestamp,
 $nonce 
 );
 // use SORT_STRING rule
 sort ( $tmpArr, SORT_STRING );
 $tmpStr = implode ( $tmpArr );
 $tmpStr = sha1 ( $tmpStr );
 if ($tmpStr == $signature) {
 return true;
 } else {
 return false;
 }
 }
}
/**
 * 定义为心中想难关的六个接口的数据发送格式模板
 */
function textMessageHandle($fromUsername, $toUsername, $time, $msgType, $contentStr) {
 $textTpl = "
  
  
  %s
  
  
  0
 ";
 $resultStr = sprintf ( $textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr );
 echo $resultStr;
}
function imageMessageHandle($fromUsername, $toUsername, $time, $msgType, $contentStr) {
 $imageTpl = "
  
  
  %s
  
  
  
  
  1234567890123456
  ";
 $resultStr = sprintf ( $textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr );
 echo $resultStr;
}
function musicMessageHandle($fromUsername, $toUsername, $time, $msgType, $musictitle, $musicDescription, $musicurl, $hqmusicurl) {
 $musicTpl = "
  
  
  %s
  
  
  
  
  
  
  
 ";
 $resultStr = sprintf($musicTpl, $fromUsername, $toUsername, $time, $msgType, $musictitle, $musicDescription, $musicurl, $hqmusicurl);
 echo $resultStr;
}
/**
 * 图灵 机器人接口
 * 
 * 使用curl来进行浏览器模拟并抓取数据
 */
function turing($requestStr) {
 /* // 图灵机器人接口
 $url = "http://www.tuling123.com/openapi/api";
 // 用于POST请求的数据
 $data = array(
 "key"=>"您在图灵机器人官网上申请的key",
 "info"=>$requestStr
 );
 // 构造curl下载器
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
 $requestStr = curl_exec($ch);
 curl_close($ch);
 return responseStr; */
 $url = "http://api.qingyunke.com/api.php?key=free&appid=0&msg=".$requestStr;
 $result = file_get_contents($url);
 $result = json_decode($result, true);
 return $result['content'];
}
?>

Summary

Finally, let’s review what knowledge points were used in this experiment.

• PHP’s object-oriented programming is simple to implement.

• Two ways of interface processing

• Access, processing, and feedback to the backend private server of the WeChat public account.

• Interaction between front and back ends, and application of chat robots.

Actually, these codes are quite different from what I originally imagined. Originally, I wanted to implement a "remote control". Before going to bed at night, I would use WeChat to send a command "Open "Electric blanket". After half an hour, I finished watching TV. When I went to bed, I found that the bed was very warm. Yes, as long as some hardware is added, this is easy to achieve. Moreover, it can be completed with a refrigerator and TV. In that case, it is estimated that you will need to see a doctor. It's called "smart home".

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