Add per account overridable timezone setting

To make it possible to render the timetable in the user's local time we
need to know the timezone to render it in on the server.  Otherwise
there will be hydration errors and paint flashing as the client renders
a different timezone.

Add a server global default timezone that can be overriden on a
per-account bases to prepare for timezone handling the timetable.

nuxt.config.ts

@@ -6,6 +6,7 @@ export default defineNuxtConfig({
 		cookieSecretKey: "",
 		vapidPrivateKey: "",
 		public: {
+			defaultTimezone: "Europe/Oslo",
 			vapidPublicKey: "",
 		}
 	}

package.json

@@ -10,6 +10,7 @@
 		"postinstall": "nuxt prepare"
 	},
 	"dependencies": {
+		"luxon": "^3.5.0",
 		"nuxt": "^3.15.4",
 		"vue": "latest",
 		"vue-router": "latest",
@@ -23,6 +24,7 @@
 		]
 	},
 	"devDependencies": {
+		"@types/luxon": "^3.4.2",
 		"@types/web-push": "^3.6.4"
 	}
 }

pages/account/settings.vue

@@ -5,6 +5,15 @@
 			Name: {{ session?.account.name }}
 		</p>
 		<p>Access: {{ session?.account.type }}</p>
+		<form @submit.prevent="changeSettings">
+			<label>
+				Timezone
+				<input type="text" v-model="timezone">
+			</label>
+			<button type="submit">
+				Save
+			</button>
+		</form>
 		<p>
 			<PushNotification />
 		</p>
@@ -26,6 +35,22 @@ definePageMeta({
 const { data: session } = useAccountSession();
 const { refresh: sessionRefresh } = useAccountSession();
 
+const timezone = ref(session.value?.account.timezone ?? "");
+
+async function changeSettings() {
+	try {
+		await $fetch("/api/account", {
+			method: "patch",
+			body: {
+				timezone: timezone.value,
+			}
+		});
+		await sessionRefresh();
+	} catch (err: any) {
+		alert(err.data.message);
+	}
+}
+
 async function deleteAccount() {
 	try {
 		await $fetch.raw("/api/account", {

pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      luxon:
+        specifier: ^3.5.0
+        version: 3.5.0
       nuxt:
         specifier: ^3.15.4
         version: 3.15.4(@parcel/watcher@2.5.1)(@types/node@22.13.8)(db0@0.2.4)(ioredis@5.5.0)(magicast@0.3.5)(rollup@4.34.9)(terser@5.39.0)(typescript@5.8.2)(vite@6.2.0(@types/node@22.13.8)(jiti@2.4.2)(terser@5.39.0)(yaml@2.7.0))(yaml@2.7.0)
@@ -21,6 +24,9 @@ importers:
         specifier: ^3.6.7
         version: 3.6.7
     devDependencies:
+      '@types/luxon':
+        specifier: ^3.4.2
+        version: 3.4.2
       '@types/web-push':
         specifier: ^3.6.4
         version: 3.6.4
@@ -873,6 +879,9 @@ packages:
   '@types/http-proxy@1.17.16':
     resolution: {integrity: sha512-sdWoUajOB1cd0A8cRRQ1cfyWNbmFKLAqBB89Y8x5iYyG/mkJHc0YUH8pdWBy2omi9qtCpiIgGjuwO0dQST2l5w==}
 
+  '@types/luxon@3.4.2':
+    resolution: {integrity: sha512-TifLZlFudklWlMBfhubvgqTXRzLDI5pCbGa4P8a3wPyUQSW+1xQ5eDsreP9DWHX3tjq1ke96uYG/nwundroWcA==}
+
   '@types/node@22.13.8':
     resolution: {integrity: sha512-G3EfaZS+iOGYWLLRCEAXdWK9my08oHNZ+FHluRiggIYJPOXzhOiDgpVCUHaUvyIC5/fj7C/p637jdzC666AOKQ==}
 
@@ -1943,6 +1952,10 @@ packages:
   lru-cache@5.1.1:
     resolution: {integrity: sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==}
 
+  luxon@3.5.0:
+    resolution: {integrity: sha512-rh+Zjr6DNfUYR3bPwJEnuwDdqMbxZW7LOQfUN4B54+Cl+0o5zaU9RJ6bcidfDtC1cWCZXQ+nvX8bf6bAji37QQ==}
+    engines: {node: '>=12'}
+
   magic-string-ast@0.7.0:
     resolution: {integrity: sha512-686fgAHaJY7wLTFEq7nnKqeQrhqmXB19d1HnqT35Ci7BN6hbAYLZUezTQ062uUHM7ggZEQlqJ94Ftls+KDXU8Q==}
     engines: {node: '>=16.14.0'}
@@ -4036,6 +4049,8 @@ snapshots:
     dependencies:
       '@types/node': 22.13.8
 
+  '@types/luxon@3.4.2': {}
+
   '@types/node@22.13.8':
     dependencies:
       undici-types: 6.20.0
@@ -5210,6 +5225,8 @@ snapshots:
     dependencies:
       yallist: 3.1.1
 
+  luxon@3.5.0: {}
+
   magic-string-ast@0.7.0:
     dependencies:
       magic-string: 0.30.17

server/api/account.patch.ts

@@ -1,12 +1,16 @@
 import { Account } from "~/shared/types/account";
 import { readAccounts, writeAccounts } from "~/server/database";
+import { DateTime } from "luxon";
 
 export default defineEventHandler(async (event) => {
 	const session = await requireAccountSession(event);
-	const body: Pick<Account, "interestedIds"> = await readBody(event);
+	const body: Pick<Account, "interestedIds" | "timezone"> = await readBody(event);
 	if (
+		body.interestedIds !== undefined
+		&& !(
 			!(body.interestedIds instanceof Array)
 			|| !body.interestedIds.every(id => typeof id === "string")
+		)
 	) {
 		throw createError({
 			status: 400,
@@ -14,17 +18,43 @@ export default defineEventHandler(async (event) => {
 		});
 	}
 
+	if (body.timezone !== undefined) {
+		if (typeof body.timezone !== "string") {
+			throw createError({
+				status: 400,
+				message: "Invalid timezone",
+			});
+		}
+		if (body.timezone.length) {
+			const zonedTime = DateTime.local().setZone(body.timezone);
+			if (!zonedTime.isValid) {
+				throw createError({
+					status: 400,
+					message: "Invalid timezone: " + zonedTime.invalidExplanation,
+				});
+			}
+		}
+	}
+
 	const accounts = await readAccounts();
 	const sessionAccount = accounts.find(account => account.id === session.accountId);
 	if (!sessionAccount) {
 		throw Error("Account does not exist");
 	}
 
+	if (body.interestedIds !== undefined) {
 		if (body.interestedIds.length) {
 			sessionAccount.interestedIds = body.interestedIds;
 		} else {
 			delete sessionAccount.interestedIds;
 		}
+	}
+	if (body.timezone !== undefined) {
+		if (body.timezone)
+			sessionAccount.timezone = body.timezone;
+		else
+			delete sessionAccount.timezone;
+	}
 	await writeAccounts(accounts);
 
 	// Update Schedule counts.

shared/types/account.d.ts

@@ -4,6 +4,7 @@ export interface Account {
 	/** Name of the account. Not present on anonymous accounts */
 	name?: string,
 	interestedIds?: string[],
+	timezone?: string,
 }
 
 export interface Subscription {