add user accounts and OSM peak catalog with zoom-based notability

src/routes/signup/+page.server.ts

@@ -0,0 +1,33 @@
+import { fail, redirect } from '@sveltejs/kit';
+import { createSession, createUser, findUser } from '$lib/server/auth';
+import type { Actions } from './$types';
+
+export const actions: Actions = {
+	default: async ({ request, cookies }) => {
+		const form = await request.formData();
+		const username = String(form.get('username') ?? '').trim();
+		const password = String(form.get('password') ?? '');
+
+		if (!/^[a-zA-Z0-9_.-]{3,30}$/.test(username)) {
+			return fail(400, {
+				username,
+				error: 'Username must be 3-30 characters (letters, digits, _ . -).'
+			});
+		}
+		if (password.length < 8) {
+			return fail(400, { username, error: 'Password must be at least 8 characters.' });
+		}
+		if (findUser(username)) {
+			return fail(400, { username, error: 'That username is taken.' });
+		}
+
+		const user = createUser(username, password);
+		cookies.set('session', createSession(user.id), {
+			path: '/',
+			httpOnly: true,
+			sameSite: 'lax',
+			maxAge: 30 * 86400
+		});
+		redirect(303, '/');
+	}
+};