Use Slim framework middleware to realize the functions of ID card recognition and reading information

Use Slim framework middleware to realize the functions of ID card recognition and reading information

ID card is an important identity certificate for Chinese citizens, and it carries the citizen’s personal information. In many application scenarios, the user's ID card needs to be identified and read. This article will use the middleware of the Slim framework to implement such a functional module.

First, we need to install the Slim framework. Execute the following command in the project directory:

composer require slim/slim

Next, we create a file named IdCardMiddleware.php and write the code for the middleware.

<?php

use PsrHttpMessageServerRequestInterface as Request;
use PsrHttpServerRequestHandlerInterface as RequestHandler;
use SlimPsr7Response;

class IdCardMiddleware
{
    private $apiKey;
    private $apiSecret;
    
    public function __construct($apiKey, $apiSecret)
    {
        $this->apiKey = $apiKey;
        $this->apiSecret = $apiSecret;
    }
    
    public function __invoke(Request $request, RequestHandler $handler): Response
    {
        // 获取请求中的身份证图片数据
        $imageData = $request->getParsedBody()['image_data'] ?? '';
        
        // 调用第三方接口进行身份证识别
        $result = $this->callApi($imageData);
        if (!$result) {
            // 如果识别失败，返回错误信息给客户端
            return new Response(400, [], '身份证识别失败');
        }
        
        // 解析身份证信息
        $idCardInfo = $this->parseResult($result);
        if (!$idCardInfo) {
            // 如果解析失败，返回错误信息给客户端
            return new Response(400, [], '身份证信息解析失败');
        }
        
        // 将身份证信息保存到请求的属性中，供后续的路由处理器使用
        $request = $request->withAttribute('idCardInfo', $idCardInfo);
        
        // 继续处理下一个请求处理器
        $response = $handler->handle($request);
        
        return $response;
    }
    
    private function callApi($imageData)
    {
        // 调用第三方接口进行身份证识别的具体实现
        // 在此省略实现细节
        
        // 返回识别结果
        return [
            'name' => '张三',
            'gender' => '男',
            'nation' => '汉族',
            'birthday' => '1990-01-01',
            'address' => '北京市朝阳区'
        ];
    }
    
    private function parseResult($result)
    {
        // 解析识别结果的具体实现
        // 在此省略实现细节
        
        // 返回解析结果
        return [
            'name' => $result['name'],
            'gender' => $result['gender'],
            'nation' => $result['nation'],
            'birthday' => $result['birthday'],
            'address' => $result['address']
        ];
    }
}

Code analysis:

1. IdCardMiddleware class is a callable object that implements the __invoke method, which is the Slim framework middleware requirements.
2. The constructor receives the API key and secret key as parameters and saves them to the object's properties.
3. In the __invoke method, first obtain the ID card image data from the request.
4. Call the callApi method to identify the ID card through a third-party interface and return the identification result.
5. If the recognition fails, error information will be returned to the client. If the recognition is successful, then call the parseResult method to parse the recognition result and return the ID card information.
6. Save the ID card information into the requested attributes. In this way, the ID card information can be obtained through the getAttribute method in the subsequent route processor.
7. Continue processing the next request processor and return the response result.

Next, we use this middleware.

<?php

use SlimFactoryAppFactory;

require __DIR__ . '/vendor/autoload.php';

// 创建Slim应用
$app = AppFactory::create();

// 添加中间件
$app->add(new IdCardMiddleware('your_api_key', 'your_api_secret'));

// 定义路由
$app->post('/idcard', function ($request, $response, $args) {
    // 从请求属性中获取身份证信息
    $idCardInfo = $request->getAttribute('idCardInfo');
    
    // 处理业务逻辑
    // 在此省略实现细节
    
    // 返回响应结果
    $response->getBody()->write(json_encode($idCardInfo));
    return $response;
});

// 运行应用
$app->run();

Code analysis:

1. Create Slim application object.
2. Use the $app->add method to add middleware. The key and secret key of the API need to be passed in as parameters.
3. Define a POST type route /idcard, and obtain the ID card information through the $request->getAttribute method in the route processor.
4. Business logic can be processed in the processor, where the ID card information is returned to the client.
5. Finally use the $app->run method to run the application.

In this way, we have implemented the functional module of using the Slim framework middleware to realize ID card recognition and read information. Through this module, we can easily access the ID card recognition API and use it in the application.

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