Resurrect Service Worker (#7108)

* Resolve #7106

* fix lint

* fix lint

* save lang in idb

* fix lint

* fix

* cache locale file

* fix lint

* :v:

* wip

* fix [wip]

* fix [wip]

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/client/scripts/initialize-sw.ts b/src/client/scripts/initialize-sw.ts
new file mode 100644
index 0000000000..d6dbd5dbd4
--- /dev/null
+++ b/src/client/scripts/initialize-sw.ts
@@ -0,0 +1,68 @@
+import { instance } from '@/instance';
+import { $i } from '@/account';
+import { api } from '@/os';
+import { lang } from '@/config';
+
+export async function initializeSw() {
+	if (instance.swPublickey &&
+		('serviceWorker' in navigator) &&
+		('PushManager' in window) &&
+		$i && $i.token) {
+		navigator.serviceWorker.register(`/sw.js`);
+
+		navigator.serviceWorker.ready.then(registration => {
+			registration.active?.postMessage({
+				msg: 'initialize',
+				lang,
+			});
+			// SEE: https://developer.mozilla.org/en-US/docs/Web/API/PushManager/subscribe#Parameters
+			registration.pushManager.subscribe({
+				userVisibleOnly: true,
+				applicationServerKey: urlBase64ToUint8Array(instance.swPublickey)
+			}).then(subscription => {
+				function encode(buffer: ArrayBuffer | null) {
+					return btoa(String.fromCharCode.apply(null, new Uint8Array(buffer)));
+				}
+
+				// Register
+				api('sw/register', {
+					endpoint: subscription.endpoint,
+					auth: encode(subscription.getKey('auth')),
+					publickey: encode(subscription.getKey('p256dh'))
+				});
+			})
+			// When subscribe failed
+			.catch(async (err: Error) => {
+				// 通知が許可されていなかったとき
+				if (err.name === 'NotAllowedError') {
+					return;
+				}
+
+				// 違うapplicationServerKey (または gcm_sender_id)のサブスクリプションが
+				// 既に存在していることが原因でエラーになった可能性があるので、
+				// そのサブスクリプションを解除しておく
+				const subscription = await registration.pushManager.getSubscription();
+				if (subscription) subscription.unsubscribe();
+			});
+		});
+	}
+}
+
+/**
+ * Convert the URL safe base64 string to a Uint8Array
+ * @param base64String base64 string
+ */
+function urlBase64ToUint8Array(base64String: string): Uint8Array {
+	const padding = '='.repeat((4 - base64String.length % 4) % 4);
+	const base64 = (base64String + padding)
+		.replace(/-/g, '+')
+		.replace(/_/g, '/');
+
+	const rawData = window.atob(base64);
+	const outputArray = new Uint8Array(rawData.length);
+
+	for (let i = 0; i < rawData.length; ++i) {
+		outputArray[i] = rawData.charCodeAt(i);
+	}
+	return outputArray;
+}