From 8ccbe2ebf149b3551542797b6b2942fcd9aea778 Mon Sep 17 00:00:00 2001
From: Nathan Woodburn <github@nathan.woodburn.au>
Date: Wed, 29 Jan 2025 18:51:28 +1100
Subject: [PATCH] feat: Add service worker

---
 manifest.json => pwa/manifest.json |  0
 pwa/sw.js                          | 53 ++++++++++++++++++++++++++++++
 server.py                          | 10 +++---
 templates/index.html               |  7 +++-
 4 files changed, 65 insertions(+), 5 deletions(-)
 rename manifest.json => pwa/manifest.json (100%)
 create mode 100644 pwa/sw.js

diff --git a/manifest.json b/pwa/manifest.json
similarity index 100%
rename from manifest.json
rename to pwa/manifest.json
diff --git a/pwa/sw.js b/pwa/sw.js
new file mode 100644
index 0000000..20cc77e
--- /dev/null
+++ b/pwa/sw.js
@@ -0,0 +1,53 @@
+// This is the service worker with the combined offline experience (Offline page + Offline copy of pages)
+
+const CACHE = "pwabuilder-offline-page";
+
+importScripts('https://storage.googleapis.com/workbox-cdn/releases/5.1.2/workbox-sw.js');
+
+const offlineFallbackPage = "404";
+
+self.addEventListener("message", (event) => {
+  if (event.data && event.data.type === "SKIP_WAITING") {
+    self.skipWaiting();
+  }
+});
+
+self.addEventListener('install', async (event) => {
+  event.waitUntil(
+    caches.open(CACHE)
+      .then((cache) => cache.add(offlineFallbackPage))
+  );
+});
+
+if (workbox.navigationPreload.isSupported()) {
+  workbox.navigationPreload.enable();
+}
+
+workbox.routing.registerRoute(
+  new RegExp('/*'),
+  new workbox.strategies.StaleWhileRevalidate({
+    cacheName: CACHE
+  })
+);
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.mode === 'navigate') {
+    event.respondWith((async () => {
+      try {
+        const preloadResp = await event.preloadResponse;
+
+        if (preloadResp) {
+          return preloadResp;
+        }
+
+        const networkResp = await fetch(event.request);
+        return networkResp;
+      } catch (error) {
+
+        const cache = await caches.open(CACHE);
+        const cachedResp = await cache.match(offlineFallbackPage);
+        return cachedResp;
+      }
+    })());
+  }
+});
\ No newline at end of file
diff --git a/server.py b/server.py
index 808de22..10a8012 100644
--- a/server.py
+++ b/server.py
@@ -237,18 +237,20 @@ def manifest():
     host = request.host
 
     # Read as json
-    with open("manifest.json") as file:
+    with open("pwa/manifest.json") as file:
         manifest = json.load(file)
     url = f"https://{host}"
     if host == "localhost:5000" or host == "127.0.0.1:5000":
         url = "http://127.0.0.1:5000"
     
     manifest["start_url"] = url
-    manifest["scope"] = url
-    
-    
+    manifest["scope"] = url    
     return jsonify(manifest)
 
+@app.route("/sw.js")
+def pw():
+    return send_from_directory("pwa", "sw.js")
+
 
 # region Sol Links
 @app.route("/actions.json")
diff --git a/templates/index.html b/templates/index.html
index ebc2053..7c14be8 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -274,7 +274,12 @@ Check them out here!</blockquote><img class="img-fluid" src="/assets/img/pfront.
     ethdomain.addEventListener('click', () => {
         copyToClipboard(ethdomain);
     });
-</script>{{custom | safe}}
+</script>{{custom | safe}}<script>
+  if (typeof navigator.serviceWorker !== 'undefined') {
+    navigator.serviceWorker.register('sw.js')
+  }
+</script>
+
     <div class="d-none d-print-none d-sm-none d-md-block d-lg-block d-xl-block d-xxl-block clock" style="padding: 1em;background: #10101039;border-top-right-radius: 10px;"><svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 20 20" fill="none" class="fs-2">
 
             <path fill-rule="evenodd" clip-rule="evenodd" d="M10 18C14.4183 18 18 14.4183 18 10C18 5.58172 14.4183 2 10 2C5.58172 2 2 5.58172 2 10C2 14.4183 5.58172 18 10 18ZM11 6C11 5.44772 10.5523 5 10 5C9.44771 5 9 5.44772 9 6V10C9 10.2652 9.10536 10.5196 9.29289 10.7071L12.1213 13.5355C12.5118 13.9261 13.145 13.9261 13.5355 13.5355C13.9261 13.145 13.9261 12.5118 13.5355 12.1213L11 9.58579V6Z" fill="currentColor"></path>