composer的pre-file-download事件怎么用_解析pre-file-download事件在下载前的应用

// ExamplePlugin/EventHandler.php
namespace ExamplePlugin;

use ComposerIOIOInterface;
use ComposerPluginPreFileDownloadEvent;
use ComposerPluginPluginInterface;

class EventHandler
{
    public static function onPreFileDownload(PreFileDownloadEvent $event)
    {
        $httpDownloader = $event->getHttpDownloader();
        $url = $event->getProcessedUrl();

        // 示例：输出正在下载的 URL
        $event->getIO()->writeError("即将下载: " . $url);

        // 示例：替换为国内镜像（仅示例逻辑）
        if (strpos($url, 'github.com') !== false) {
            $mirroredUrl = str_replace('github.com', 'ghproxy.com', $url);
            $event->setProcessedUrl($mirroredUrl);
            $event->getIO()->writeError("已镜像到: " . $mirroredUrl);
        }

        // 示例：添加自定义请求头（如认证）
        // $httpDownloader->addOptions(['headers' => ['Authorization' => 'token xxx']]);
    }
}

// ExamplePlugin/Plugin.php
namespace ExamplePlugin;

use ComposerComposer;
use ComposerEventDispatcherEventSubscriberInterface;
use ComposerIOIOInterface;
use ComposerPluginPluginInterface;

class Plugin implements PluginInterface, EventSubscriberInterface
{
    public function activate(Composer $composer, IOInterface $io)
    {
        // 激活插件
    }

    public static function getSubscribedEvents()
    {
        return [
            'pre-file-download' => [['onPreFileDownload', 0]]
        ];
    }
}

{
    "name": "example/composer-mirror-plugin",
    "type": "composer-plugin",
    "autoload": {
        "psr-4": { "ExamplePlugin\": "" }
    },
    "require": {
        "composer-plugin-api": "^2.0"
    },
    "extra": {
        "class": "ExamplePlugin\Plugin"
    }
}

composer require example/composer-mirror-plugin