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@@ -0,0 +1,126 @@
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'use strict';
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const version = new URL(self.location.href).searchParams.get('v') || 'dev';
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const cacheName = `ft-plus-static-${version}`;
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const scopeUrl = new URL(self.registration.scope);
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const corePaths = [
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'./',
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'index.html',
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'flutter_bootstrap.js',
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'flutter.js',
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'main.dart.js',
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'manifest.json',
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'assets/AssetManifest.bin.json',
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'assets/FontManifest.json',
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];
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const coreUrls = corePaths.map((path) => new URL(path, scopeUrl).href);
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const staticPrefixes = [
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'assets/',
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'canvaskit/',
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'icons/',
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'splashes/',
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];
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const staticFiles = new Set(['favicon.ico', 'manifest.json']);
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const oldFlutterCaches = new Set([
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'flutter-app-cache',
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'flutter-app-manifest',
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'flutter-temp-cache',
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]);
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches
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.open(cacheName)
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.then((cache) => cache.addAll(coreUrls))
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.then(() => self.skipWaiting()),
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);
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});
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches
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.keys()
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.then((names) =>
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Promise.all(
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names
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.filter(
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(name) =>
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(name.startsWith('ft-plus-static-') && name !== cacheName) ||
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oldFlutterCaches.has(name),
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)
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.map((name) => caches.delete(name)),
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),
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)
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.then(() => self.clients.claim()),
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);
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});
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self.addEventListener('fetch', (event) => {
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const request = event.request;
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if (request.method !== 'GET') {
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return;
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}
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const url = new URL(request.url);
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if (url.origin !== scopeUrl.origin || !url.pathname.startsWith(scopeUrl.pathname)) {
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return;
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}
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if (request.mode === 'navigate') {
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event.respondWith(networkFirst(request, coreUrls[0], false));
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return;
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}
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const relativePath = url.pathname.slice(scopeUrl.pathname.length);
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if (isCoreUrl(url.href)) {
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event.respondWith(networkFirst(request));
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} else if (relativePath.startsWith('workers/')) {
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event.respondWith(networkFirst(request));
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} else if (
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staticPrefixes.some((prefix) => relativePath.startsWith(prefix)) ||
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staticFiles.has(relativePath)
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) {
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event.respondWith(cacheFirst(request));
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}
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});
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function isCoreUrl(url) {
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return coreUrls.includes(url);
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}
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async function networkFirst(request, fallbackUrl, cacheResponse = true) {
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const cache = await caches.open(cacheName);
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try {
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const response = await fetch(request);
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if (cacheResponse && response.ok) {
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await cache.put(request, response.clone());
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}
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return response;
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} catch (error) {
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const cached = await cache.match(request);
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if (cached) {
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return cached;
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}
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if (fallbackUrl) {
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const fallback = await cache.match(fallbackUrl);
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if (fallback) {
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return fallback;
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}
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}
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throw error;
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}
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}
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async function cacheFirst(request) {
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const cache = await caches.open(cacheName);
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const cached = await cache.match(request);
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if (cached) {
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return cached;
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}
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const response = await fetch(request);
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if (response.ok) {
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await cache.put(request, response.clone());
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}
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return response;
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}
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