105 lines
2.7 KiB
Solidity
105 lines
2.7 KiB
Solidity
// SPDX-License-Identifier: Apache 2
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pragma solidity ^0.7.6;
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pragma abicoder v2;
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import './IWormhole.sol';
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import 'solidity-bytes-utils/contracts/BytesLib.sol';
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/// @title Helper library for cross-chain swaps
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/// @notice Contains functions necessary for parsing encoded VAAs
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/// and structs containing swap parameters
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library SwapHelper {
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using BytesLib for bytes;
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/// @dev Parameters needed for exactIn swap type
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struct ExactInParameters {
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uint256 amountIn;
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uint256 amountOutMinimum;
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uint256 targetAmountOutMinimum;
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bytes32 targetChainRecipient;
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uint256 deadline;
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uint24 poolFee;
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}
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/// @dev Parameters needed for exactOut swap type
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struct ExactOutParameters {
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uint256 amountOut;
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uint256 amountInMaximum;
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uint256 targetAmountOut;
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bytes32 targetChainRecipient;
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uint256 deadline;
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uint24 poolFee;
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}
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/// @dev Parameters parsed from a VAA for executing swaps
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/// on the destination chain
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struct DecodedVaaParameters {
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// in order of decoding
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uint8 version;
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uint256 swapAmount;
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address contractAddress;
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bytes32 fromAddress;
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uint256 estimatedAmount;
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address recipientAddress;
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address[2] path;
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uint256 deadline;
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uint24 poolFee;
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uint8 swapFunctionType;
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uint256 relayerFee;
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}
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/// @dev Decodes parameters encoded in a VAA
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function decodeVaaPayload(
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bytes memory vmPayload
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) public view returns (DecodedVaaParameters memory decoded) {
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uint index = 0;
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decoded.version = vmPayload.toUint8(index);
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index += 1;
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decoded.swapAmount = vmPayload.toUint256(index);
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index += 32;
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// skip
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index += 46;
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decoded.contractAddress = vmPayload.toAddress(index);
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index += 20;
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// skip
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index += 2;
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decoded.fromAddress = vmPayload.toBytes32(index);
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index += 32;
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decoded.estimatedAmount = vmPayload.toUint256(index);
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index += 44;
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decoded.recipientAddress = vmPayload.toAddress(index);
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index += 20;
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decoded.path[0] = vmPayload.toAddress(index);
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index += 20;
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decoded.path[1] = vmPayload.toAddress(index);
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index += 20;
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decoded.deadline = vmPayload.toUint256(index);
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index += 32;
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// skip
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index += 1;
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decoded.poolFee = vmPayload.toUint16(index);
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index += 2;
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decoded.swapFunctionType = vmPayload.toUint8(index);
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index += 1;
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decoded.relayerFee = vmPayload.toUint256(index);
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index += 32;
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require(vmPayload.length == index, "invalid payload length");
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}
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} |