Builder.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8.0;

import './ClaimOrderUnlockBuilder.sol';
import './InitWalletIfNeededBuilder.sol';
import './DlnOrderLib.sol';

library DlnBuilder {
  function serializeClaimOrderUnlock(
    uint64 initReward,
    uint64 claimUnlockReward,
    bytes32 unlockBeneficiary,
    uint256 orderId,
    DlnOrderLib.Order memory order
  ) internal view returns (bytes memory data) {
    data = abi.encodePacked(
      DlnInitWalletIfNeededBuilder.getSerializedInitWalletIfNeededExternalInstruction(
        initReward,
        unlockBeneficiary,
        toBytes32(order.giveTokenAddress, 0)
      ),
      DlnClaimOrderUnlockBuilder.getSerializedClaimOrderUnlockExternalInstruction(
        claimUnlockReward,
        unlockBeneficiary,
        orderId,
        getChainId(),
        toBytes32(order.giveTokenAddress, 0)
      )
    );
  }

  function getChainId() private view returns (uint256 cid) {
    assembly {
      cid := chainid()
    }
  }

  function toBytes32(bytes memory _bytes, uint256 _start) private pure returns (bytes32) {
    require(_bytes.length >= _start + 32, 'toBytes32_outOfBounds');
    bytes32 tempBytes32;

    assembly {
      tempBytes32 := mload(add(add(_bytes, 0x20), _start))
    }

    return tempBytes32;
  }
}