Supra_App/src/routes/api/catalog-banner/+server.ts

import { json, error } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { env } from '$env/dynamic/public';

const API_BASE = env.PUBLIC_POST_IMAGE;

// Replace an existing promo's banner image.
export const POST: RequestHandler = async ({ request }) => {
	try {
		const formData = await request.formData();

		const country = formData.get('country') as string;
		const slug = formData.get('slug') as string;
		const uid = formData.get('uid') as string;
		const displayName = formData.get('displayName') as string;
		const email = formData.get('email') as string;
		const banner = formData.get('banner') as File;

		if (!country || !slug || !uid || !displayName || !email || !banner) {
			throw error(400, 'Missing required fields');
		}

		const endpoint =
			`${API_BASE}/catalog/banner/${encodeURIComponent(country)}/${encodeURIComponent(slug)}` +
			`/${encodeURIComponent(uid)}/${encodeURIComponent(displayName)}/${encodeURIComponent(email)}`;

		const upstream = new FormData();
		upstream.append('banner', banner);

		const response = await fetch(endpoint, { method: 'POST', body: upstream });
		if (!response.ok) {
			const data = await response.json().catch(() => ({ detail: response.statusText }));
			throw error(response.status, data.detail || 'Replace banner failed');
		}
		return json(await response.json());
	} catch (err) {
		if (err && typeof err === 'object' && 'status' in err) throw err;
		throw error(500, err instanceof Error ? err.message : 'Internal server error');
	}
};