function _validateCommitment(
IAstariaRouter.Commitment calldata params,
address receiver
) internal view {
uint256 collateralId = params.tokenContract.computeId(params.tokenId);
ERC721 CT = ERC721(address(COLLATERAL_TOKEN()));
address holder = CT.ownerOf(collateralId);
address operator = CT.getApproved(collateralId);
if (
  msg.sender != holder &&
  receiver != holder &&
  receiver != operator &&
  !CT.isApprovedForAll(holder, msg.sender)
) {
  revert InvalidRequest(InvalidRequestReason.NO_AUTHORITY);
}
if (
  msg.sender != holder &&
  receiver != holder &&
  receiver != operator &&
  msg.sender != operator &&
  !CT.isApprovedForAll(holder, msg.sender)
) {
  revert InvalidRequest(InvalidRequestReason.NO_AUTHORITY);
}
  function flashAction(
    IFlashAction receiver,
    uint256 collateralId,
    bytes calldata data
  ) external onlyOwner(collateralId) {
modifier onlyOwner(uint256 collateralId) {
	require(ownerOf(collateralId) == msg.sender);
	_;
}
