Function decorateDecryptionResult

src/utils.ts:1349–1389

(
  decrypted: Document & { [kDecoratedKeys]?: Array<string> },
  original: Document,
  isTopLevelDecorateCall = true
)

 * @internal
 */
export function decorateDecryptionResult(
  decrypted: Document & { [kDecoratedKeys]?: Array<string> },
  original: Document,
  isTopLevelDecorateCall = true
): void {
  if (isTopLevelDecorateCall) {
    // The original value could have been either a JS object or a BSON buffer
    if (ByteUtils.isUint8Array(original)) {
      original = deserialize(original);
    }
    if (ByteUtils.isUint8Array(decrypted)) {
      throw new MongoRuntimeError('Expected result of decryption to be deserialized BSON object');
    }
  }

  if (!decrypted || typeof decrypted !== 'object') return;
  for (const k of Object.keys(decrypted)) {
    const originalValue = original[k];

    // An object was decrypted by libmongocrypt if and only if it was
    // a BSON Binary object with subtype 6.
    if (originalValue && originalValue._bsontype === 'Binary' && originalValue.sub_type === 6) {
      if (!decrypted[kDecoratedKeys]) {
        Object.defineProperty(decrypted, kDecoratedKeys, {
          value: [],
          configurable: true,
          enumerable: false,
          writable: false
        });
      }
      // this is defined in the preceding if-statement
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      decrypted[kDecoratedKeys]!.push(k);
      // Do not recurse into this decrypted value. It could be a sub-document/array,
      // in which case there is no original value associated with its subfields.
      continue;
    }

    decorateDecryptionResult(decrypted[k], originalValue, false);
  }
}

/** @internal */
export const kDispose: unique symbol = (Symbol.dispose as any) ?? Symbol('dispose');