Ole-Morten Duesund
1260cfd18f
Make Favoritter installable as a Progressive Web App with offline
static asset caching and Web Share Target API for Android.
New files:
- internal/handler/pwa.go: handlers for manifest, service worker,
and share target
- web/static/sw.js: service worker (cache-first static, network-first
HTML) with {{BASE_PATH}} placeholder for subpath deployments
- web/static/icons/: placeholder PWA icons (192, 512, 512-maskable)
Key design decisions:
- Share target uses GET (not POST) to avoid CSRF token issues — Android
apps cannot provide CSRF tokens
- Manifest is generated dynamically to inject BasePath into start_url,
scope, icon paths, and share_target action
- Service worker served at /sw.js with Cache-Control: no-cache and
BasePath injected via string replacement
- handleShare extracts URLs from Android's "text" field as fallback
(many apps put the URL there instead of "url")
- handleFaveNew replaced with handleFaveNewPreFill that reads url,
description, notes from query params (enables share + bookmarklets)
- SW registration in app.js reads base-path from <meta> tag (CSP-safe)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
// Favoritter — Service Worker for PWA offline support.
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// SPDX-License-Identifier: AGPL-3.0-or-later
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var BASE = "{{BASE_PATH}}";
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var CACHE_NAME = "favoritter-v1";
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var STATIC_URLS = [
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BASE + "/static/vendor/pico.min.css",
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BASE + "/static/vendor/htmx.min.js",
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BASE + "/static/css/style.css",
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BASE + "/static/js/app.js",
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BASE + "/static/icons/icon-192.png"
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];
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self.addEventListener("install", function (event) {
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event.waitUntil(
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caches.open(CACHE_NAME).then(function (cache) {
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return cache.addAll(STATIC_URLS);
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})
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);
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self.skipWaiting();
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});
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self.addEventListener("activate", function (event) {
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event.waitUntil(
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caches.keys().then(function (names) {
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return Promise.all(
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names.filter(function (n) { return n !== CACHE_NAME; })
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.map(function (n) { return caches.delete(n); })
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);
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})
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);
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self.clients.claim();
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});
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self.addEventListener("fetch", function (event) {
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var url = new URL(event.request.url);
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// Cache-first for static assets.
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if (url.pathname.startsWith(BASE + "/static/")) {
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event.respondWith(
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caches.match(event.request).then(function (cached) {
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return cached || fetch(event.request).then(function (response) {
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var clone = response.clone();
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caches.open(CACHE_NAME).then(function (cache) {
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cache.put(event.request, clone);
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});
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return response;
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});
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})
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);
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return;
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}
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// Network-first for navigation (HTML pages).
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if (event.request.mode === "navigate") {
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event.respondWith(
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fetch(event.request).catch(function () {
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return caches.match(event.request);
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})
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);
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return;
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}
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// Default: network only.
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event.respondWith(fetch(event.request));
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});
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