add admin settings

src/routes/admin/settings/+page.server.ts

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+import type { PageServerLoad } from './$types';
+import { getSession } from '$lib/server/session';
+import { Permissions } from '$lib/permissions';
+import { redirect } from '@sveltejs/kit';
+import { env } from '$env/dynamic/public';
+import { Settings } from '$lib/server/database';
+
+export const load: PageServerLoad = async ({ parent, cookies }) => {
+	if (getSession(cookies, { permissions: [Permissions.SettingsRead] }) == null) {
+		throw redirect(302, `${env.PUBLIC_BASE_PATH}/admin`);
+	}
+
+	const { self } = await parent();
+
+	const settings = (await Settings.findAll()).reduce(
+		(prev, curr) => {
+			return { ...prev, [curr.key]: curr.value };
+		},
+		{} as { [key: string]: any }
+	);
+
+	return {
+		settings: {
+			register: {
+				enabled: settings['register.enabled'] ?? true
+			}
+		},
+		self: self
+	};
+};

src/routes/admin/settings/+page.svelte

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+<script lang="ts">
+	import type { PageData } from './$types';
+	import { env } from '$env/dynamic/public';
+	export let data: PageData;
+	let settings = structuredClone(data.settings);
+
+	async function change() {
+		await fetch(`${env.PUBLIC_BASE_PATH}/admin/settings`, {
+			method: 'POST',
+			body: JSON.stringify({
+				register: {
+					enabled: returnIfNoDup(settings.register.enabled, data.settings.register.enabled)
+				}
+			} as PageData['settings'])
+		});
+		data.settings = settings;
+		settings = structuredClone(data.settings);
+	}
+
+	function returnIfNoDup<T>(value: T, original: T): T | undefined {
+		return value != original ? value : undefined;
+	}
+</script>
+
+<div class="h-full flex flex-col items-center justify-between">
+	<div class="grid grid-cols-3 w-full [&>*]:mx-8">
+		<div>
+			<div class="divider">Anmeldung</div>
+			<label class="label cursor-pointer">
+				<span class="label-text">Aktiviert</span>
+				<input type="checkbox" class="toggle" bind:checked={settings.register.enabled} />
+			</label>
+		</div>
+	</div>
+	<div class="mb-6">
+		<button
+			class="btn btn-success mt-auto"
+			class:btn-disabled={JSON.stringify(data.settings) === JSON.stringify(settings)}
+			on:click={change}>Speichern</button
+		>
+	</div>
+</div>

src/routes/admin/settings/+server.ts

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+import type { PageData } from './$types';
+import type { RequestHandler } from '@sveltejs/kit';
+import { getSession } from '$lib/server/session';
+import { Permissions } from '$lib/permissions';
+import { Settings } from '$lib/server/database';
+
+export const POST = (async ({ request, cookies }) => {
+	if (getSession(cookies, { permissions: [Permissions.SettingsWrite] }) == null) {
+		return new Response(null, {
+			status: 401
+		});
+	}
+
+	const settings: PageData['settings'] = await request.json();
+
+	for (const [key, value] of Object.entries(settings.register)) {
+		const setting = await Settings.findOne({ where: { key: `register.${key}` } });
+		if (setting) {
+			setting.value = JSON.stringify(value);
+			await setting.save();
+		} else {
+			await Settings.create({
+				key: `register.${key}`,
+				value: JSON.stringify(value)
+			});
+		}
+	}
+
+	return new Response();
+}) satisfies RequestHandler;