Refactor subscription format

Place the actual push subscription data into a push property on the
subscription so that other properties can be added to it.

server/api/subscribe.post.ts

@@ -1,13 +1,17 @@
 import { readSubscriptions, writeSubscriptions } from "~/server/database";
+import { Subscription } from "~/shared/types/account";
 
 export default defineEventHandler(async (event) => {
 	const body: { subscription: PushSubscriptionJSON } = await readBody(event);
 	const subscriptions = await readSubscriptions();
-	const existingIndex = subscriptions.findIndex(sub => sub.endpoint === body.subscription.endpoint);
+	const existingIndex = subscriptions.findIndex(
+		sub => sub.type === "push" && sub.push.endpoint === body.subscription.endpoint
+	);
+	const subscription: Subscription = { type: "push", push: body.subscription };
 	if (existingIndex !== -1) {
-		subscriptions[existingIndex] = body.subscription;
+		subscriptions[existingIndex] = subscription;
 	} else {
-		subscriptions.push(body.subscription);
+		subscriptions.push(subscription);
 	}
 	await writeSubscriptions(subscriptions);
 	if (existingIndex !== -1) {

server/api/unsubscribe.post.ts

@@ -3,7 +3,9 @@ import { readSubscriptions, writeSubscriptions } from "~/server/database";
 export default defineEventHandler(async (event) => {
 	const body: { subscription: PushSubscriptionJSON } = await readBody(event);
 	const subscriptions = await readSubscriptions();
-	const existingIndex = subscriptions.findIndex(sub => sub.endpoint === body.subscription.endpoint);
+	const existingIndex = subscriptions.findIndex(
+		sub => sub.type === "push" && sub.push.endpoint === body.subscription.endpoint
+	);
 	if (existingIndex !== -1) {
 		subscriptions.splice(existingIndex, 1);
 	} else {

server/database.ts

@@ -1,6 +1,7 @@
 import { readFile, writeFile } from "node:fs/promises";
 import { Schedule } from "~/shared/types/schedule";
 import { generateDemoSchedule } from "./generate-demo-schedule";
+import { Subscription } from "~/shared/types/account";
 
 // For this demo I'm just storing the runtime data in JSON files. When making
 // this into proper application this should be replaced with an actual database.
@@ -29,10 +30,14 @@ export async function writeSchedule(schedule: Schedule) {
 }
 
 export async function readSubscriptions() {
-	let subscriptions = await readJson<PushSubscriptionJSON[]>(subscriptionsPath, []);
+	let subscriptions = await readJson<Subscription[]>(subscriptionsPath, []);
+	if (subscriptions.length && "keys" in subscriptions[0]) {
+		// Discard old format
+		subscriptions = [];
+	}
 	return subscriptions;
 }
 
-export async function writeSubscriptions(subscriptions: PushSubscriptionJSON[]) {
+export async function writeSubscriptions(subscriptions: Subscription[]) {
 	await writeFile(subscriptionsPath, JSON.stringify(subscriptions, undefined, "\t") + "\n", "utf-8");
 }

server/web-push.ts

@@ -14,9 +14,11 @@ export async function sendPush(title: string, body: string) {
 	const removeIndexes = [];
 	for (let index = 0; index < subscriptions.length; index += 1) {
 		const subscription = subscriptions[index];
+		if (subscription.type !== "push")
+			continue;
 		try {
 			await webPush.sendNotification(
-				subscription as webPush.PushSubscription,
+				subscription.push as webPush.PushSubscription,
 				payload,
 				{
 					TTL: 3600,
@@ -24,10 +26,11 @@ export async function sendPush(title: string, body: string) {
 				}
 			)
 		} catch (err: any) {
+			if (err?.statusCode === 410) {
+				removeIndexes.push(index);
+			} else {
 				console.error("Received error sending push notice:", err.message, err?.statusCode)
 				console.error(err);
-			if (err?.statusCode >= 400 && err?.statusCode < 500) {
-				removeIndexes.push(index)
 			}
 		}
 	}

shared/types/account.d.ts

@@ -0,0 +1,4 @@
+export interface Subscription {
+	type: "push",
+	push: PushSubscriptionJSON,
+}