How to use middleware in Laravel for WeChat applet development

How to use middleware in Laravel for WeChat applet development

Introduction:
WeChat applet is becoming more and more popular in mobile application development, and Laravel As a powerful PHP framework, it is also widely used in the development of web applications. When using Laravel to develop WeChat mini programs, we can use Laravel middleware to handle the authorization, login, data verification and other processes of WeChat mini programs to improve development efficiency and code quality. This article will introduce how to use middleware in Laravel to develop WeChat mini programs and provide corresponding code examples.

1. Introduce relevant dependencies
To use middleware in Laravel to develop WeChat applet, we first need to introduce relevant dependency packages. Add the following dependencies to the project's composer.json file:

"overtrue/laravel-wechat": "~4.0"

Then execute the composer update command to install the dependency packages.

2. Configure the relevant information of the WeChat applet
In the project configuration file (config/wechat.php), add the relevant configuration information of the WeChat applet, as shown below:

'official_account' => [
    'default' => [
        'app_id' => env('WECHAT_OFFICIAL_ACCOUNT_APPID', ''),
        'secret' => env('WECHAT_OFFICIAL_ACCOUNT_SECRET', ''),
        'token'  => env('WECHAT_OFFICIAL_ACCOUNT_TOKEN', ''),
        //...
    ],
],

3. Create WeChat applet middleware
In Laravel, we can quickly create middleware through the artisan command and execute the following command:

php artisan make:middleware WechatMiniProgramAuthMiddleware

After execution, Laravel will be in app/Http/Middleware A middleware class file named WechatMiniProgramAuthMiddleware is generated in the directory. Open this file, we can handle the authorization, login and other logic of the WeChat applet in the handle method.

<?php

namespace AppHttpMiddleware;

use Closure;
use EasyWeChatFactory;

class WechatMiniProgramAuthMiddleware
{
    public function handle($request, Closure $next)
    {
        // 获取请求中的微信小程序 CODE
        $code = $request->input('code');
        
        // 使用 EasyWeChat 单例获取微信小程序实例
        $miniProgram = Factory::miniProgram();
        
        // 根据 CODE 获取微信用户信息
        $user = $miniProgram->auth->session($code);
        
        // 根据用户的OpenID进行业务逻辑处理
        // ...
        
        // 将用户信息存入请求中，方便后续处理
        $request->attributes->set('wechat_user', $user);
        
        return $next($request);
    }
}

4. Use middleware for WeChat applet authorization
When we need to use the authorization information of the WeChat applet, we can use the middleware we just created in the corresponding route or controller. The following is an example of using middleware:

<?php

namespace AppHttpControllers;

use IlluminateHttpRequest;

class UserController extends Controller
{
    public function show(Request $request)
    {
        // 获取微信小程序授权用户的信息
        $user = $request->attributes->get('wechat_user');
        
        // 对用户信息进行业务逻辑处理
        // ...
    }
}

5. Register middleware
In order for Laravel to correctly handle the middleware we create, we also need to register the middleware in the route. Open the app/Http/Kernel.php file and add the middleware class to the $routeMiddleware attribute. For example:

protected $routeMiddleware = [
    // ...
    'wechat.mini.program.auth' => AppHttpMiddlewareWechatMiniProgramAuthMiddleware::class,
];

6. Configure routing
Finally, we need to configure routing so that Laravel can use middleware correctly. Here is a sample routing configuration:

Api::middleware('wechat.mini.program.auth')->group(function () {
    Route::get('user/{id}', 'UserController@show');
});

In the above example, we are applying the middleware we created wechat.mini to a request to /user/{id}. program.auth.

Conclusion:
Through the above steps, we can use middleware in Laravel to develop WeChat applet. Using middleware, we can more conveniently handle the authorization, login and other processes of WeChat applet, and improve development efficiency and code quality. I hope this article can help developers who are developing WeChat mini programs.

(Note: The above code examples are for reference only, and the specific implementation will be adjusted and expanded according to actual needs.)

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