CakePHP ミドルウェア: ファイルのアップロードおよびダウンロード機能を実装します。

<?php

namespace AppMiddleware;

use CakeUtilityText;
use CakeHttpResponse;
use PsrHttpMessageResponseInterface;
use PsrHttpMessageServerRequestInterface;
use CakeHttpServerRequest;

class FileHandlerMiddleware
{
    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, $next)
    {
        $path = WWW_ROOT . 'uploads' . DS;
        
        // 处理文件上传
        if ($request->getMethod() === 'POST' && $request->getData('file')) {
            $file = $request->getData('file');
            $fileName = Text::uuid() . '-' . $file->getClientFilename();
            $file->moveTo($path . $fileName);
            
            $response = new Response();
            $response = $response->withAddedHeader('Content-Type', 'application/json');
            $response->getBody()->write(json_encode(['success' => true, 'message' => '文件上传成功！']));
            
            return $response;
        }
        
        // 处理文件下载
        $params = $request->getAttribute('params');
        if (isset($params['file'])) {
            $fileName = $params['file'];
            $filePath = $path . $fileName;
            
            if (file_exists($filePath)) {
                $stream = fopen($filePath, 'r');
                
                $response = new Response();
                $response = $response->withAddedHeader('Content-Disposition', 'attachment; filename="' . $fileName . '"');
                
                $response->withBody(new SlimHttpStream($stream));
                
                return $response;
            }
        }
        
        return $next($request, $response);
    }
}

use AppMiddlewareFileHandlerMiddleware;

// ...

public function middleware($middlewareQueue)
{
    $middlewareQueue
        ->add(new FileHandlerMiddleware())
        // 其它中间件
        // ...
        ->add(new ErrorHandlerMiddleware(Configure::read('Error')))
        ->add(new AssetMiddleware())
        ->add(new RoutingMiddleware($this));

    return $middlewareQueue;
}

public function upload()
{
    // 显示上传表单
}

<form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file" />
    <button type="submit">上传</button>
</form>

/download/{file_name}

/download/example.jpg