Validate Responses

// Show the server's verdict in the completion message
survey.onComplete.add(async (sender, options) => {
  options.showSaveInProgress();
  const res = await fetch("/api/responses", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ formId: "claim", data: sender.data })
  });
  if (res.ok) return options.showSaveSuccess();
  const { errors, error } = await res.json();
  options.showSaveError(errors ? errors.map(describe).join("; ") : error);
});

// POST /api/responses — ask the SurveyJS service to validate, then store as usual
Route::post('/api/responses', function (Request $request) {
    $body = json_decode($request->getContent(), flags: JSON_THROW_ON_ERROR);    // the raw body keeps {} as {} (see Save Responses)
    $definition = DB::table('forms')->where('key', $body->formId ?? null)->value('json') ?? abort(404, 'Unknown form');
    $check = SurveyJsService::post('/response', ['schema' => json_decode($definition), 'response' => $body->data ?? null], timeout: 10);
    if ($check->status() === 422 && $check->json('errors') !== null && ! array_key_exists('warnings', $check->json())) {
        return response()->json(['errors' => $check->object()->errors], 400);    // the answers don't fit the definition
    }
    if ($check->status() !== 200 || $check->body() !== '{}') {                  // fail closed: only exactly {} means valid
        SurveyJsService::unexpected('/response', $check, $check->status() === 422 && $check->json('warnings') !== null ? 'The stored definition has errors' : 'SurveyJS service error');
    }
    $id = StoredJson::insertResponse($body->formId, $body->data);               // stored as it arrived: 1.0 stays 1.0

    return response()->json(['id' => $id], 201);
});