Bound request bodies and artifact uploads (Refs #94)

src/routes/api/deployments/preview/+server.ts

@@ -1,9 +1,10 @@
-import { json } from '@sveltejs/kit';
+import { jsonBody } from '$lib/server/request-body.js';
+import { isHttpError, json } from '@sveltejs/kit';
 import { previewCreation } from '$lib/server/provisioning/index.js';
 
 export async function POST({ request }: { request: Request }) {
     try {
-        const body = await request.json();
+        const body = await jsonBody(request);
         if (!body || typeof body !== 'object' || Array.isArray(body))
             throw new Error('Provide a launch selection.');
         if (body.blueprintId !== undefined)
@@ -12,6 +13,7 @@ export async function POST({ request }: { request: Request }) {
             );
         return json(previewCreation(body));
     } catch (err) {
+        if (isHttpError(err, 413)) throw err;
         return json({ error: (err as Error).message }, { status: 400 });
     }
 }