From c21eb26c8d011932293aeec3afe4849740f7fdf8 Mon Sep 17 00:00:00 2001
From: Kit La Touche <kit@transneptune.net>
Date: Wed, 2 Jul 2025 16:34:33 -0400
Subject: Rough in client and server side of web-push

---
 ui/routes/+layout.svelte | 74 +++++++++++++++++++++++++++++++++++++++++++++++-
 ui/service-worker.js     |  9 ++++++
 2 files changed, 82 insertions(+), 1 deletion(-)

(limited to 'ui')

diff --git a/ui/routes/+layout.svelte b/ui/routes/+layout.svelte
index 83a9ef7..0910c16 100644
--- a/ui/routes/+layout.svelte
+++ b/ui/routes/+layout.svelte
@@ -1,10 +1,76 @@
 <script>
-  import { setContext } from 'svelte';
+  import { setContext, onMount } from "svelte";
   import { onNavigate } from '$app/navigation';
   import { page } from '$app/state';
   import '../app.css';
   import logo from '$lib/assets/logo.png';
 
+  /* ==================== Start subscription library-esque ==================== */
+  function doSubscribe() {
+    navigator.serviceWorker.ready
+      .then(async(registration) => {
+        console.debug("Beginning subscription");
+        const response = await fetch("/api/vapid");
+        // and if we fail to get it?
+        const vapidPublicKey = await response.text();
+        // Chrome doesn't accept the base64-encoded (string) vapidPublicKey yet
+        // urlBase64ToUint8Array() is defined in /tools.js
+        // const convertedVapidKey = urlBase64ToUint8Array(vapidPublicKey);
+        const convertedVapidKey = vapidPublicKey;
+        // Subscribe the user
+        return registration.pushManager.subscribe({
+          userVisibleOnly: true,
+          applicationServerKey: convertedVapidKey
+        });
+      }).then((subscription) => {
+        debugger;
+        console.debug("Subscribed", subscription.endpoint);
+        return fetch("/api/register", {
+          method: "post",
+          headers: { "Content-type": "application/json" },
+          body: JSON.stringify({ subscription: subscription })
+        });
+      });
+  }
+
+  async function doUnsubscribe() {
+    navigator.serviceWorker.ready
+      .then((registration) => {
+        return registration.pushManager.getSubscription();
+      }).then((subscription) => {
+        return subscription.unsubscribe()
+          .then(function() {
+            console.log("Unsubscribed", subscription.endpoint);
+            return fetch("/api/unregister", {
+              method: "post",
+              headers: { "Content-type": "application/json" },
+              body: JSON.stringify({ subscription })
+            });
+          });
+      });
+  }
+
+  function notifyMe() {
+    fetch("/api/echo", {
+      method: "post",
+      headers: { "Content-type": "application/json" },
+      body: JSON.stringify({ msg: "oople doople" })
+    });
+  }
+
+  onMount(() => {
+    navigator.serviceWorker.ready.then((registration) => {
+      return registration.pushManager.getSubscription();
+    }).then((subscription) => {
+      if (subscription) {
+        console.debug("Already subscribed", subscription.endpoint);
+      } else {
+        doSubscribe();
+      }
+    });
+  });
+  /* ==================== END ==================== */
+
   const session = $derived(page.data.session);
   let pageContext = $state({
     showMenu: false,
@@ -30,6 +96,12 @@
     </button>
   </div>
   <a href="/">pilcrow</a>
+  <button onclick="{notifyMe}">
+    notify
+  </button>
+  <button onclick="{doUnsubscribe}">
+    unsub
+  </button>
   <div class="trail">
     {#if session}
       <div>
diff --git a/ui/service-worker.js b/ui/service-worker.js
index d9b2a7c..319b251 100644
--- a/ui/service-worker.js
+++ b/ui/service-worker.js
@@ -52,3 +52,12 @@ async function cacheFirst(request) {
 self.addEventListener('fetch', (event) => {
   event.respondWith(cacheFirst(event.request));
 });
+
+self.addEventListener('push', (event) => {
+  const payload = event.data?.text() ?? "no payload";
+  event.waitUntil(
+    self.registration.showNotification("ServiceWorker Cookbook", {
+      body: payload,
+    }),
+  );
+});
-- 
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