如何在ServiceWorker中的推送事件中獲取註冊ID？

Question

訂閱時我有註冊ID，但是當我收到推送通知時，我無法弄清楚如何獲取它在服務工作者文件中？

client.js

pushManager.subscribe({ userVisibleOnly: true }).then(({ endpoint }) => { 
    const registrationId = endpoint.split('https://android.googleapis.com/gcm/send/')[1]; 
    // How do I get this registrationId in service-worker.js below? 
}); 

服務worker.js

self.addEventListener('push', event => { 
    // I'd like to make a request to server to get the notification data, but I need the registrationId for that. How do I get registration id here? 
}); 

Answer 1

的ServiceWorkerGlobalScope內，可以得到有效ServiceWorkerRegistration，這又暴露了PushManager，這那麼給你一個getSubscription()方法，它返回一個Promise與當前訂閱解決。

有很多層遵循，但實際的代碼是相當簡單：

self.registration.pushManager.getSubscription().then(subscription => { 
    // Do something with subscription.endpoint 
});