DingTalk interface and PHP message callback implementation

Message callback implementation of DingTalk interface and PHP

DingTalk is an enterprise-level instant messaging tool that is widely used for internal communication and collaboration within enterprises. As developers, we can use DingTalk’s open platform to integrate with DingTalk and implement some customized functions.

In the DingTalk open platform, message callback is an important function. It allows our application to receive various event notifications sent by DingTalk, such as users joining group chats, new messages arriving, etc. . This article will introduce how to use PHP to implement the DingTalk message callback function and give corresponding code examples.

1. Preparation
First, we need to create an application on the DingTalk open platform and obtain the corresponding appKey and appSecret. Enter the backend of DingTalk Open Platform, enter "Development Management" - "Self-Built Application", click "Create Self-Built Application", fill in the basic information of the application and submit it. After creation, you can get the appKey and appSecret.

2. Interface Verification
When receiving a callback request from DingTalk, we first need to verify the legitimacy of the request to ensure that the request comes from DingTalk. DingTalk interface verification is verified through GET request. We need to return a specific string when receiving the verification request.

The following is a sample code:

<?php
$signature = $_GET['signature'];
$timestamp = $_GET['timestamp'];
$nonce = $_GET['nonce'];
$token = "your_token";

$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr, SORT_STRING);
$tmpStr = implode($tmpArr);
$tmpStr = sha1($tmpStr);

if ($tmpStr == $signature) {
  echo $_GET['echostr'];
} else {
  echo "Invalid request";
}
?>

Among them, $token is a custom string set when we create the application, which is used to verify the interface request.

3. Message callback processing
After the interface verification is successful, we can start processing the received message callback. DingTalk's message callback is sent through a POST request, which contains the specific message content.

The following is a sample code for processing message callbacks:

<?php
$requestData = file_get_contents('php://input');
$data = json_decode($requestData, true); // 将请求的数据转换成数组

// 根据具体的业务逻辑处理消息
if ($data['EventType'] == 'conversation_message') {
  $message = $data['Data']; // 获取具体的消息内容
  // 处理消息，比如发送回复消息
  $response = array(
    'msgtype' => 'text',
    'text' => array('content' => 'Hello,钉钉用户！')
  );
  echo json_encode($response);
} else {
  echo 'Invalid message';
}
?>

In the code, we first parse the data in the POST request into an array, and then process the message according to specific business logic. Here is an example of replying to a fixed text message after receiving the message.

4. Deployment and Testing
After saving the above code as a PHP file, you can deploy it to a server with a public IP. Then, in DingTalk Open Platform, configure the message callback URL to be the URL on the server just deployed. After configuration, we can receive the message callback sent by DingTalk and process it accordingly.

Summary
Through DingTalk’s message callback function, we can achieve real-time communication and interaction with DingTalk. This article mainly introduces how to use PHP to implement the DingTalk message callback function, and gives corresponding code examples. We hope that the introduction in this article can help developers better utilize DingTalk’s interfaces to integrate with DingTalk.

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