import { httpError } from '../../shared/http/httpError.mjs';

export function parseUploadPayload(payload) {
  if (typeof payload.dataUrl === 'string') {
    const match = payload.dataUrl.match(/^data:[^;]+;base64,(.+)$/);

    if (!match) {
      throw httpError(400, '"dataUrl" must be a base64 data URL');
    }

    return Buffer.from(match[1], 'base64');
  }

  if (typeof payload.contentBase64 === 'string') {
    return Buffer.from(payload.contentBase64, 'base64');
  }

  throw httpError(400, 'Upload payload must include "dataUrl" or "contentBase64"');
}