49 lines
2.1 KiB
Solidity
49 lines
2.1 KiB
Solidity
// contracts/Implementation.sol
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// SPDX-License-Identifier: Apache 2
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pragma solidity ^0.8.0;
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import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
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import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
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import "../../libraries/external/BytesLib.sol";
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import "../../interfaces/IWormhole.sol";
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import "../interfaces/ITokenBridge.sol";
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contract MockTokenBridgeIntegration {
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using BytesLib for bytes;
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using SafeERC20 for IERC20;
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address tokenBridgeAddress;
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function completeTransferAndSwap(bytes memory encodedVm) public {
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// token bridge transfers are 133 bytes, our additional payload is 32 bytes = 165
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// len - 165 + 33 = len - 132
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bytes32 tokenAddress = encodedVm.toBytes32(encodedVm.length-132);
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// len - 165 + 65 = len - 100
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uint16 tokenChainId = encodedVm.toUint16(encodedVm.length-100);
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address wrappedAddress = tokenBridge().wrappedAsset(tokenChainId, tokenAddress);
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IERC20 transferToken = IERC20(wrappedAddress);
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uint256 balanceBefore = transferToken.balanceOf(address(this));
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bytes memory payload = tokenBridge().completeTransferWithPayload(encodedVm);
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// make sure this vm is a payload 3
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uint8 payloadType = payload.toUint8(0);
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require(payloadType == 3, "invalid payload type");
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bytes32 vmTokenAddress = payload.toBytes32(33);
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require(tokenAddress == vmTokenAddress, 'Address parsed from VAA and payload do not match');
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uint16 vmTokenChainId = payload.toUint16(65);
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require(tokenChainId == vmTokenChainId, 'ChainId parsed from VAA and payload do not match');
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uint256 balanceAfter = transferToken.balanceOf(address(this));
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uint256 amount = balanceAfter - balanceBefore;
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// additional field(s)
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bytes32 receiver = payload.toBytes32(133);
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address receiverAddress = address(uint160(uint256(receiver)));
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transferToken.safeTransfer(receiverAddress, amount);
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}
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function tokenBridge() private view returns (ITokenBridge) {
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return ITokenBridge(tokenBridgeAddress);
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}
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function setup(address _tokenBridge) public {
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tokenBridgeAddress = _tokenBridge;
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}
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}
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