major: initial commit

public/sw.js

@@ -0,0 +1,55 @@
+console.log("[sw.js]: Running service worker");
+
+/** @type {string} */
+let cacheName = "easylogon-pwa";
+
+/** @type {string[]} */
+let filesToCache = [
+	"/",
+	"/success",
+	"/error",
+	"/privacy",
+	"/assets/index.js",
+	"/assets/PrivacyPage.js",
+	"/assets/index.css",
+	"/favicon.svg"
+];
+
+self.addEventListener("install", /** @param {InstallEvent} event */ event =>
+	event.waitUntil((async () =>
+	{
+		/** @type {Cache} */
+		let cache = await caches.open(cacheName);
+		await cache.addAll(filesToCache);
+	})())
+);
+
+self.addEventListener("fetch", /** @param {FetchEvent} event */ event =>
+	event.respondWith(
+		(async () =>
+		{
+			// Don't cache anything but GET requests
+			if (event.request.method !== "GET")
+				return await fetch(event.request);
+
+			// Try cache first
+			let response = await caches.match(new URL(event.request.url));
+
+			if (response)
+				return response;
+
+			response = await fetch(event.request);
+
+			// If fetch succeeds, cache the response
+			if (response.ok)
+			{
+				console.log("[sw.js]: Caching file", event.request.url);
+
+				const cache = await caches.open(cacheName);
+				await cache.put(event.request, response.clone());
+			}
+
+			return response;
+		})()
+	)
+);