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Contract Name:
AmarokFacet
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 1000000 runs
Other Settings:
london EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import { ILiFi } from "../Interfaces/ILiFi.sol"; import { IConnextHandler } from "../Interfaces/IConnextHandler.sol"; import { LibAsset, IERC20 } from "../Libraries/LibAsset.sol"; import { ReentrancyGuard } from "../Helpers/ReentrancyGuard.sol"; import { InformationMismatch } from "../Errors/GenericErrors.sol"; import { SwapperV2, LibSwap } from "../Helpers/SwapperV2.sol"; import { Validatable } from "../Helpers/Validatable.sol"; /// @title Amarok Facet /// @author LI.FI (https://li.fi) /// @notice Provides functionality for bridging through Connext Amarok /// @custom:version 2.0.0 contract AmarokFacet is ILiFi, ReentrancyGuard, SwapperV2, Validatable { /// Storage /// /// @notice The contract address of the connext handler on the source chain. IConnextHandler private immutable connextHandler; /// @param callData The data to execute on the receiving chain. If no crosschain call is needed, then leave empty. /// @param callTo The address of the contract on dest chain that will receive bridged funds and execute data /// @param relayerFee The amount of relayer fee the tx called xcall with /// @param slippageTol Max bps of original due to slippage (i.e. would be 9995 to tolerate .05% slippage) /// @param delegate Destination delegate address /// @param destChainDomainId The Amarok-specific domainId of the destination chain /// @param payFeeWithSendingAsset Whether to pay the relayer fee with the sending asset or not struct AmarokData { bytes callData; address callTo; uint256 relayerFee; uint256 slippageTol; address delegate; uint32 destChainDomainId; bool payFeeWithSendingAsset; } /// Constructor /// /// @notice Initialize the contract. /// @param _connextHandler The contract address of the connext handler on the source chain. constructor(IConnextHandler _connextHandler) { connextHandler = _connextHandler; } /// External Methods /// /// @notice Bridges tokens via Amarok /// @param _bridgeData Data containing core information for bridging /// @param _amarokData Data specific to bridge function startBridgeTokensViaAmarok( BridgeData calldata _bridgeData, AmarokData calldata _amarokData ) external payable nonReentrant refundExcessNative(payable(msg.sender)) doesNotContainSourceSwaps(_bridgeData) validateBridgeData(_bridgeData) noNativeAsset(_bridgeData) { validateDestinationCallFlag(_bridgeData, _amarokData); LibAsset.depositAsset( _bridgeData.sendingAssetId, _bridgeData.minAmount ); _startBridge(_bridgeData, _amarokData); } /// @notice Performs a swap before bridging via Amarok /// @param _bridgeData The core information needed for bridging /// @param _swapData An array of swap related data for performing swaps before bridging /// @param _amarokData Data specific to Amarok function swapAndStartBridgeTokensViaAmarok( BridgeData memory _bridgeData, LibSwap.SwapData[] calldata _swapData, AmarokData calldata _amarokData ) external payable nonReentrant refundExcessNative(payable(msg.sender)) containsSourceSwaps(_bridgeData) validateBridgeData(_bridgeData) noNativeAsset(_bridgeData) { validateDestinationCallFlag(_bridgeData, _amarokData); _bridgeData.minAmount = _depositAndSwap( _bridgeData.transactionId, _bridgeData.minAmount, _swapData, payable(msg.sender), _amarokData.relayerFee ); _startBridge(_bridgeData, _amarokData); } /// Private Methods /// /// @dev Contains the business logic for the bridge via Amarok /// @param _bridgeData The core information needed for bridging /// @param _amarokData Data specific to Amarok function _startBridge( BridgeData memory _bridgeData, AmarokData calldata _amarokData ) private { // give max approval for token to Amarok bridge, if not already LibAsset.maxApproveERC20( IERC20(_bridgeData.sendingAssetId), address(connextHandler), _bridgeData.minAmount ); // initiate bridge transaction if (_amarokData.payFeeWithSendingAsset) { connextHandler.xcall( _amarokData.destChainDomainId, _amarokData.callTo, _bridgeData.sendingAssetId, _amarokData.delegate, _bridgeData.minAmount - _amarokData.relayerFee, _amarokData.slippageTol, _amarokData.callData, _amarokData.relayerFee ); } else { connextHandler.xcall{ value: _amarokData.relayerFee }( _amarokData.destChainDomainId, _amarokData.callTo, _bridgeData.sendingAssetId, _amarokData.delegate, _bridgeData.minAmount, _amarokData.slippageTol, _amarokData.callData ); } emit LiFiTransferStarted(_bridgeData); } function validateDestinationCallFlag( ILiFi.BridgeData memory _bridgeData, AmarokData calldata _amarokData ) private pure { if ( (_amarokData.callData.length > 0) != _bridgeData.hasDestinationCall ) { revert InformationMismatch(); } } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; interface ILiFi { /// Structs /// struct BridgeData { bytes32 transactionId; string bridge; string integrator; address referrer; address sendingAssetId; address receiver; uint256 minAmount; uint256 destinationChainId; bool hasSourceSwaps; bool hasDestinationCall; } /// Events /// event LiFiTransferStarted(ILiFi.BridgeData bridgeData); event LiFiTransferCompleted( bytes32 indexed transactionId, address receivingAssetId, address receiver, uint256 amount, uint256 timestamp ); event LiFiTransferRecovered( bytes32 indexed transactionId, address receivingAssetId, address receiver, uint256 amount, uint256 timestamp ); event LiFiGenericSwapCompleted( bytes32 indexed transactionId, string integrator, string referrer, address receiver, address fromAssetId, address toAssetId, uint256 fromAmount, uint256 toAmount ); // Deprecated but kept here to include in ABI to parse historic events event LiFiSwappedGeneric( bytes32 indexed transactionId, string integrator, string referrer, address fromAssetId, address toAssetId, uint256 fromAmount, uint256 toAmount ); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; interface IConnextHandler { /// @notice These are the call parameters that will remain constant between the /// two chains. They are supplied on `xcall` and should be asserted on `execute` /// @property to - The account that receives funds, in the event of a crosschain call, /// will receive funds if the call fails. /// @param to - The address you are sending funds (and potentially data) to /// @param callData - The data to execute on the receiving chain. If no crosschain call is needed, then leave empty. /// @param originDomain - The originating domain (i.e. where `xcall` is called). Must match nomad domain schema /// @param destinationDomain - The final domain (i.e. where `execute` / `reconcile` are called). Must match nomad domain schema /// @param agent - An address who can execute txs on behalf of `to`, in addition to allowing relayers /// @param recovery - The address to send funds to if your `Executor.execute call` fails /// @param forceSlow - If true, will take slow liquidity path even if it is not a permissioned call /// @param receiveLocal - If true, will use the local nomad asset on the destination instead of adopted. /// @param callback - The address on the origin domain of the callback contract /// @param callbackFee - The relayer fee to execute the callback /// @param relayerFee - The amount of relayer fee the tx called xcall with /// @param slippageTol - Max bps of original due to slippage (i.e. would be 9995 to tolerate .05% slippage) struct CallParams { address to; bytes callData; uint32 originDomain; uint32 destinationDomain; address agent; address recovery; bool forceSlow; bool receiveLocal; address callback; uint256 callbackFee; uint256 relayerFee; uint256 slippageTol; } /// @notice The arguments you supply to the `xcall` function called by user on origin domain /// @param params - The CallParams. These are consistent across sending and receiving chains /// @param transactingAsset - The asset the caller sent with the transfer. Can be the adopted, canonical, /// or the representational asset /// @param transactingAmount - The amount of transferring asset supplied by the user in the `xcall` /// @param originMinOut - Minimum amount received on swaps for adopted <> local on origin chain struct XCallArgs { CallParams params; address transactingAsset; // Could be adopted, local, or wrapped uint256 transactingAmount; uint256 originMinOut; } function xcall( uint32 destination, address recipient, address tokenAddress, address delegate, uint256 amount, uint256 slippage, bytes memory callData ) external payable returns (bytes32); function xcall( uint32 destination, address recipient, address tokenAddress, address delegate, uint256 amount, uint256 slippage, bytes memory callData, uint256 _relayerFee ) external returns (bytes32); }
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.8.17; import { InsufficientBalance, NullAddrIsNotAnERC20Token, NullAddrIsNotAValidSpender, NoTransferToNullAddress, InvalidAmount, NativeAssetTransferFailed } from "../Errors/GenericErrors.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { LibSwap } from "./LibSwap.sol"; /// @title LibAsset /// @notice This library contains helpers for dealing with onchain transfers /// of assets, including accounting for the native asset `assetId` /// conventions and any noncompliant ERC20 transfers library LibAsset { uint256 private constant MAX_UINT = type(uint256).max; address internal constant NULL_ADDRESS = address(0); /// @dev All native assets use the empty address for their asset id /// by convention address internal constant NATIVE_ASSETID = NULL_ADDRESS; //address(0) /// @notice Gets the balance of the inheriting contract for the given asset /// @param assetId The asset identifier to get the balance of /// @return Balance held by contracts using this library function getOwnBalance(address assetId) internal view returns (uint256) { return isNativeAsset(assetId) ? address(this).balance : IERC20(assetId).balanceOf(address(this)); } /// @notice Transfers ether from the inheriting contract to a given /// recipient /// @param recipient Address to send ether to /// @param amount Amount to send to given recipient function transferNativeAsset( address payable recipient, uint256 amount ) private { if (recipient == NULL_ADDRESS) revert NoTransferToNullAddress(); if (amount > address(this).balance) revert InsufficientBalance(amount, address(this).balance); // solhint-disable-next-line avoid-low-level-calls (bool success, ) = recipient.call{ value: amount }(""); if (!success) revert NativeAssetTransferFailed(); } /// @notice If the current allowance is insufficient, the allowance for a given spender /// is set to MAX_UINT. /// @param assetId Token address to transfer /// @param spender Address to give spend approval to /// @param amount Amount to approve for spending function maxApproveERC20( IERC20 assetId, address spender, uint256 amount ) internal { if (isNativeAsset(address(assetId))) { return; } if (spender == NULL_ADDRESS) { revert NullAddrIsNotAValidSpender(); } if (assetId.allowance(address(this), spender) < amount) { SafeERC20.safeApprove(IERC20(assetId), spender, 0); SafeERC20.safeApprove(IERC20(assetId), spender, MAX_UINT); } } /// @notice Transfers tokens from the inheriting contract to a given /// recipient /// @param assetId Token address to transfer /// @param recipient Address to send token to /// @param amount Amount to send to given recipient function transferERC20( address assetId, address recipient, uint256 amount ) private { if (isNativeAsset(assetId)) { revert NullAddrIsNotAnERC20Token(); } if (recipient == NULL_ADDRESS) { revert NoTransferToNullAddress(); } uint256 assetBalance = IERC20(assetId).balanceOf(address(this)); if (amount > assetBalance) { revert InsufficientBalance(amount, assetBalance); } SafeERC20.safeTransfer(IERC20(assetId), recipient, amount); } /// @notice Transfers tokens from a sender to a given recipient /// @param assetId Token address to transfer /// @param from Address of sender/owner /// @param to Address of recipient/spender /// @param amount Amount to transfer from owner to spender function transferFromERC20( address assetId, address from, address to, uint256 amount ) internal { if (isNativeAsset(assetId)) { revert NullAddrIsNotAnERC20Token(); } if (to == NULL_ADDRESS) { revert NoTransferToNullAddress(); } IERC20 asset = IERC20(assetId); uint256 prevBalance = asset.balanceOf(to); SafeERC20.safeTransferFrom(asset, from, to, amount); if (asset.balanceOf(to) - prevBalance != amount) { revert InvalidAmount(); } } function depositAsset(address assetId, uint256 amount) internal { if (amount == 0) revert InvalidAmount(); if (isNativeAsset(assetId)) { if (msg.value < amount) revert InvalidAmount(); } else { uint256 balance = IERC20(assetId).balanceOf(msg.sender); if (balance < amount) revert InsufficientBalance(amount, balance); transferFromERC20(assetId, msg.sender, address(this), amount); } } function depositAssets(LibSwap.SwapData[] calldata swaps) internal { for (uint256 i = 0; i < swaps.length; ) { LibSwap.SwapData calldata swap = swaps[i]; if (swap.requiresDeposit) { depositAsset(swap.sendingAssetId, swap.fromAmount); } unchecked { i++; } } } /// @notice Determines whether the given assetId is the native asset /// @param assetId The asset identifier to evaluate /// @return Boolean indicating if the asset is the native asset function isNativeAsset(address assetId) internal pure returns (bool) { return assetId == NATIVE_ASSETID; } /// @notice Wrapper function to transfer a given asset (native or erc20) to /// some recipient. Should handle all non-compliant return value /// tokens as well by using the SafeERC20 contract by open zeppelin. /// @param assetId Asset id for transfer (address(0) for native asset, /// token address for erc20s) /// @param recipient Address to send asset to /// @param amount Amount to send to given recipient function transferAsset( address assetId, address payable recipient, uint256 amount ) internal { isNativeAsset(assetId) ? transferNativeAsset(recipient, amount) : transferERC20(assetId, recipient, amount); } /// @dev Checks whether the given address is a contract and contains code function isContract(address _contractAddr) internal view returns (bool) { uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(_contractAddr) } return size > 0; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.8.17; /// @title Reentrancy Guard /// @author LI.FI (https://li.fi) /// @notice Abstract contract to provide protection against reentrancy abstract contract ReentrancyGuard { /// Storage /// bytes32 private constant NAMESPACE = keccak256("com.lifi.reentrancyguard"); /// Types /// struct ReentrancyStorage { uint256 status; } /// Errors /// error ReentrancyError(); /// Constants /// uint256 private constant _NOT_ENTERED = 0; uint256 private constant _ENTERED = 1; /// Modifiers /// modifier nonReentrant() { ReentrancyStorage storage s = reentrancyStorage(); if (s.status == _ENTERED) revert ReentrancyError(); s.status = _ENTERED; _; s.status = _NOT_ENTERED; } /// Private Methods /// /// @dev fetch local storage function reentrancyStorage() private pure returns (ReentrancyStorage storage data) { bytes32 position = NAMESPACE; // solhint-disable-next-line no-inline-assembly assembly { data.slot := position } } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; error AlreadyInitialized(); error CannotAuthoriseSelf(); error CannotBridgeToSameNetwork(); error ContractCallNotAllowed(); error CumulativeSlippageTooHigh(uint256 minAmount, uint256 receivedAmount); error ExternalCallFailed(); error InformationMismatch(); error InsufficientBalance(uint256 required, uint256 balance); error InvalidAmount(); error InvalidCallData(); error InvalidConfig(); error InvalidContract(); error InvalidDestinationChain(); error InvalidFallbackAddress(); error InvalidReceiver(); error InvalidSendingToken(); error NativeAssetNotSupported(); error NativeAssetTransferFailed(); error NoSwapDataProvided(); error NoSwapFromZeroBalance(); error NotAContract(); error NotInitialized(); error NoTransferToNullAddress(); error NullAddrIsNotAnERC20Token(); error NullAddrIsNotAValidSpender(); error OnlyContractOwner(); error RecoveryAddressCannotBeZero(); error ReentrancyError(); error TokenNotSupported(); error UnAuthorized(); error UnsupportedChainId(uint256 chainId); error WithdrawFailed(); error ZeroAmount();
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import { ILiFi } from "../Interfaces/ILiFi.sol"; import { LibSwap } from "../Libraries/LibSwap.sol"; import { LibAsset } from "../Libraries/LibAsset.sol"; import { LibAllowList } from "../Libraries/LibAllowList.sol"; import { ContractCallNotAllowed, NoSwapDataProvided, CumulativeSlippageTooHigh } from "../Errors/GenericErrors.sol"; /// @title Swapper /// @author LI.FI (https://li.fi) /// @notice Abstract contract to provide swap functionality contract SwapperV2 is ILiFi { /// Types /// /// @dev only used to get around "Stack Too Deep" errors struct ReserveData { bytes32 transactionId; address payable leftoverReceiver; uint256 nativeReserve; } /// Modifiers /// /// @dev Sends any leftover balances back to the user /// @notice Sends any leftover balances to the user /// @param _swaps Swap data array /// @param _leftoverReceiver Address to send leftover tokens to /// @param _initialBalances Array of initial token balances modifier noLeftovers( LibSwap.SwapData[] calldata _swaps, address payable _leftoverReceiver, uint256[] memory _initialBalances ) { uint256 numSwaps = _swaps.length; if (numSwaps != 1) { address finalAsset = _swaps[numSwaps - 1].receivingAssetId; uint256 curBalance; _; for (uint256 i = 0; i < numSwaps - 1; ) { address curAsset = _swaps[i].receivingAssetId; // Handle multi-to-one swaps if (curAsset != finalAsset) { curBalance = LibAsset.getOwnBalance(curAsset) - _initialBalances[i]; if (curBalance > 0) { LibAsset.transferAsset( curAsset, _leftoverReceiver, curBalance ); } } unchecked { ++i; } } } else { _; } } /// @dev Sends any leftover balances back to the user reserving native tokens /// @notice Sends any leftover balances to the user /// @param _swaps Swap data array /// @param _leftoverReceiver Address to send leftover tokens to /// @param _initialBalances Array of initial token balances modifier noLeftoversReserve( LibSwap.SwapData[] calldata _swaps, address payable _leftoverReceiver, uint256[] memory _initialBalances, uint256 _nativeReserve ) { uint256 numSwaps = _swaps.length; if (numSwaps != 1) { address finalAsset = _swaps[numSwaps - 1].receivingAssetId; uint256 curBalance; _; for (uint256 i = 0; i < numSwaps - 1; ) { address curAsset = _swaps[i].receivingAssetId; // Handle multi-to-one swaps if (curAsset != finalAsset) { curBalance = LibAsset.getOwnBalance(curAsset) - _initialBalances[i]; uint256 reserve = LibAsset.isNativeAsset(curAsset) ? _nativeReserve : 0; if (curBalance > 0) { LibAsset.transferAsset( curAsset, _leftoverReceiver, curBalance - reserve ); } } unchecked { ++i; } } } else { _; } } /// @dev Refunds any excess native asset sent to the contract after the main function /// @notice Refunds any excess native asset sent to the contract after the main function /// @param _refundReceiver Address to send refunds to modifier refundExcessNative(address payable _refundReceiver) { uint256 initialBalance = address(this).balance - msg.value; _; uint256 finalBalance = address(this).balance; if (finalBalance > initialBalance) { LibAsset.transferAsset( LibAsset.NATIVE_ASSETID, _refundReceiver, finalBalance - initialBalance ); } } /// Internal Methods /// /// @dev Deposits value, executes swaps, and performs minimum amount check /// @param _transactionId the transaction id associated with the operation /// @param _minAmount the minimum amount of the final asset to receive /// @param _swaps Array of data used to execute swaps /// @param _leftoverReceiver The address to send leftover funds to /// @return uint256 result of the swap function _depositAndSwap( bytes32 _transactionId, uint256 _minAmount, LibSwap.SwapData[] calldata _swaps, address payable _leftoverReceiver ) internal returns (uint256) { uint256 numSwaps = _swaps.length; if (numSwaps == 0) { revert NoSwapDataProvided(); } address finalTokenId = _swaps[numSwaps - 1].receivingAssetId; uint256 initialBalance = LibAsset.getOwnBalance(finalTokenId); if (LibAsset.isNativeAsset(finalTokenId)) { initialBalance -= msg.value; } uint256[] memory initialBalances = _fetchBalances(_swaps); LibAsset.depositAssets(_swaps); _executeSwaps( _transactionId, _swaps, _leftoverReceiver, initialBalances ); uint256 newBalance = LibAsset.getOwnBalance(finalTokenId) - initialBalance; if (newBalance < _minAmount) { revert CumulativeSlippageTooHigh(_minAmount, newBalance); } return newBalance; } /// @dev Deposits value, executes swaps, and performs minimum amount check and reserves native token for fees /// @param _transactionId the transaction id associated with the operation /// @param _minAmount the minimum amount of the final asset to receive /// @param _swaps Array of data used to execute swaps /// @param _leftoverReceiver The address to send leftover funds to /// @param _nativeReserve Amount of native token to prevent from being swept back to the caller function _depositAndSwap( bytes32 _transactionId, uint256 _minAmount, LibSwap.SwapData[] calldata _swaps, address payable _leftoverReceiver, uint256 _nativeReserve ) internal returns (uint256) { uint256 numSwaps = _swaps.length; if (numSwaps == 0) { revert NoSwapDataProvided(); } address finalTokenId = _swaps[numSwaps - 1].receivingAssetId; uint256 initialBalance = LibAsset.getOwnBalance(finalTokenId); if (LibAsset.isNativeAsset(finalTokenId)) { initialBalance -= msg.value; } uint256[] memory initialBalances = _fetchBalances(_swaps); LibAsset.depositAssets(_swaps); ReserveData memory rd = ReserveData( _transactionId, _leftoverReceiver, _nativeReserve ); _executeSwaps(rd, _swaps, initialBalances); uint256 newBalance = LibAsset.getOwnBalance(finalTokenId) - initialBalance; if (LibAsset.isNativeAsset(finalTokenId)) { newBalance -= _nativeReserve; } if (newBalance < _minAmount) { revert CumulativeSlippageTooHigh(_minAmount, newBalance); } return newBalance; } /// Private Methods /// /// @dev Executes swaps and checks that DEXs used are in the allowList /// @param _transactionId the transaction id associated with the operation /// @param _swaps Array of data used to execute swaps /// @param _leftoverReceiver Address to send leftover tokens to /// @param _initialBalances Array of initial balances function _executeSwaps( bytes32 _transactionId, LibSwap.SwapData[] calldata _swaps, address payable _leftoverReceiver, uint256[] memory _initialBalances ) internal noLeftovers(_swaps, _leftoverReceiver, _initialBalances) { uint256 numSwaps = _swaps.length; for (uint256 i = 0; i < numSwaps; ) { LibSwap.SwapData calldata currentSwap = _swaps[i]; if ( !((LibAsset.isNativeAsset(currentSwap.sendingAssetId) || LibAllowList.contractIsAllowed(currentSwap.approveTo)) && LibAllowList.contractIsAllowed(currentSwap.callTo) && LibAllowList.selectorIsAllowed( bytes4(currentSwap.callData[:4]) )) ) revert ContractCallNotAllowed(); LibSwap.swap(_transactionId, currentSwap); unchecked { ++i; } } } /// @dev Executes swaps and checks that DEXs used are in the allowList /// @param _reserveData Data passed used to reserve native tokens /// @param _swaps Array of data used to execute swaps function _executeSwaps( ReserveData memory _reserveData, LibSwap.SwapData[] calldata _swaps, uint256[] memory _initialBalances ) internal noLeftoversReserve( _swaps, _reserveData.leftoverReceiver, _initialBalances, _reserveData.nativeReserve ) { uint256 numSwaps = _swaps.length; for (uint256 i = 0; i < numSwaps; ) { LibSwap.SwapData calldata currentSwap = _swaps[i]; if ( !((LibAsset.isNativeAsset(currentSwap.sendingAssetId) || LibAllowList.contractIsAllowed(currentSwap.approveTo)) && LibAllowList.contractIsAllowed(currentSwap.callTo) && LibAllowList.selectorIsAllowed( bytes4(currentSwap.callData[:4]) )) ) revert ContractCallNotAllowed(); LibSwap.swap(_reserveData.transactionId, currentSwap); unchecked { ++i; } } } /// @dev Fetches balances of tokens to be swapped before swapping. /// @param _swaps Array of data used to execute swaps /// @return uint256[] Array of token balances. function _fetchBalances( LibSwap.SwapData[] calldata _swaps ) private view returns (uint256[] memory) { uint256 numSwaps = _swaps.length; uint256[] memory balances = new uint256[](numSwaps); address asset; for (uint256 i = 0; i < numSwaps; ) { asset = _swaps[i].receivingAssetId; balances[i] = LibAsset.getOwnBalance(asset); if (LibAsset.isNativeAsset(asset)) { balances[i] -= msg.value; } unchecked { ++i; } } return balances; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.8.17; import { LibAsset } from "../Libraries/LibAsset.sol"; import { LibUtil } from "../Libraries/LibUtil.sol"; import { InvalidReceiver, InformationMismatch, InvalidSendingToken, InvalidAmount, NativeAssetNotSupported, InvalidDestinationChain, CannotBridgeToSameNetwork } from "../Errors/GenericErrors.sol"; import { ILiFi } from "../Interfaces/ILiFi.sol"; import { LibSwap } from "../Libraries/LibSwap.sol"; contract Validatable { modifier validateBridgeData(ILiFi.BridgeData memory _bridgeData) { if (LibUtil.isZeroAddress(_bridgeData.receiver)) { revert InvalidReceiver(); } if (_bridgeData.minAmount == 0) { revert InvalidAmount(); } if (_bridgeData.destinationChainId == block.chainid) { revert CannotBridgeToSameNetwork(); } _; } modifier noNativeAsset(ILiFi.BridgeData memory _bridgeData) { if (LibAsset.isNativeAsset(_bridgeData.sendingAssetId)) { revert NativeAssetNotSupported(); } _; } modifier onlyAllowSourceToken( ILiFi.BridgeData memory _bridgeData, address _token ) { if (_bridgeData.sendingAssetId != _token) { revert InvalidSendingToken(); } _; } modifier onlyAllowDestinationChain( ILiFi.BridgeData memory _bridgeData, uint256 _chainId ) { if (_bridgeData.destinationChainId != _chainId) { revert InvalidDestinationChain(); } _; } modifier containsSourceSwaps(ILiFi.BridgeData memory _bridgeData) { if (!_bridgeData.hasSourceSwaps) { revert InformationMismatch(); } _; } modifier doesNotContainSourceSwaps(ILiFi.BridgeData memory _bridgeData) { if (_bridgeData.hasSourceSwaps) { revert InformationMismatch(); } _; } modifier doesNotContainDestinationCalls( ILiFi.BridgeData memory _bridgeData ) { if (_bridgeData.hasDestinationCall) { revert InformationMismatch(); } _; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to * 0 before setting it to a non-zero value. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 amount) external returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import { LibAsset } from "./LibAsset.sol"; import { LibUtil } from "./LibUtil.sol"; import { InvalidContract, NoSwapFromZeroBalance, InsufficientBalance } from "../Errors/GenericErrors.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; library LibSwap { struct SwapData { address callTo; address approveTo; address sendingAssetId; address receivingAssetId; uint256 fromAmount; bytes callData; bool requiresDeposit; } event AssetSwapped( bytes32 transactionId, address dex, address fromAssetId, address toAssetId, uint256 fromAmount, uint256 toAmount, uint256 timestamp ); function swap(bytes32 transactionId, SwapData calldata _swap) internal { if (!LibAsset.isContract(_swap.callTo)) revert InvalidContract(); uint256 fromAmount = _swap.fromAmount; if (fromAmount == 0) revert NoSwapFromZeroBalance(); uint256 nativeValue = LibAsset.isNativeAsset(_swap.sendingAssetId) ? _swap.fromAmount : 0; uint256 initialSendingAssetBalance = LibAsset.getOwnBalance( _swap.sendingAssetId ); uint256 initialReceivingAssetBalance = LibAsset.getOwnBalance( _swap.receivingAssetId ); if (nativeValue == 0) { LibAsset.maxApproveERC20( IERC20(_swap.sendingAssetId), _swap.approveTo, _swap.fromAmount ); } if (initialSendingAssetBalance < _swap.fromAmount) { revert InsufficientBalance( _swap.fromAmount, initialSendingAssetBalance ); } // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory res) = _swap.callTo.call{ value: nativeValue }(_swap.callData); if (!success) { string memory reason = LibUtil.getRevertMsg(res); revert(reason); } uint256 newBalance = LibAsset.getOwnBalance(_swap.receivingAssetId); emit AssetSwapped( transactionId, _swap.callTo, _swap.sendingAssetId, _swap.receivingAssetId, _swap.fromAmount, newBalance > initialReceivingAssetBalance ? newBalance - initialReceivingAssetBalance : newBalance, block.timestamp ); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import { InvalidContract } from "../Errors/GenericErrors.sol"; /// @title Lib Allow List /// @author LI.FI (https://li.fi) /// @notice Library for managing and accessing the conract address allow list library LibAllowList { /// Storage /// bytes32 internal constant NAMESPACE = keccak256("com.lifi.library.allow.list"); struct AllowListStorage { mapping(address => bool) allowlist; mapping(bytes4 => bool) selectorAllowList; address[] contracts; } /// @dev Adds a contract address to the allow list /// @param _contract the contract address to add function addAllowedContract(address _contract) internal { _checkAddress(_contract); AllowListStorage storage als = _getStorage(); if (als.allowlist[_contract]) return; als.allowlist[_contract] = true; als.contracts.push(_contract); } /// @dev Checks whether a contract address has been added to the allow list /// @param _contract the contract address to check function contractIsAllowed( address _contract ) internal view returns (bool) { return _getStorage().allowlist[_contract]; } /// @dev Remove a contract address from the allow list /// @param _contract the contract address to remove function removeAllowedContract(address _contract) internal { AllowListStorage storage als = _getStorage(); if (!als.allowlist[_contract]) { return; } als.allowlist[_contract] = false; uint256 length = als.contracts.length; // Find the contract in the list for (uint256 i = 0; i < length; i++) { if (als.contracts[i] == _contract) { // Move the last element into the place to delete als.contracts[i] = als.contracts[length - 1]; // Remove the last element als.contracts.pop(); break; } } } /// @dev Fetch contract addresses from the allow list function getAllowedContracts() internal view returns (address[] memory) { return _getStorage().contracts; } /// @dev Add a selector to the allow list /// @param _selector the selector to add function addAllowedSelector(bytes4 _selector) internal { _getStorage().selectorAllowList[_selector] = true; } /// @dev Removes a selector from the allow list /// @param _selector the selector to remove function removeAllowedSelector(bytes4 _selector) internal { _getStorage().selectorAllowList[_selector] = false; } /// @dev Returns if selector has been added to the allow list /// @param _selector the selector to check function selectorIsAllowed(bytes4 _selector) internal view returns (bool) { return _getStorage().selectorAllowList[_selector]; } /// @dev Fetch local storage struct function _getStorage() internal pure returns (AllowListStorage storage als) { bytes32 position = NAMESPACE; // solhint-disable-next-line no-inline-assembly assembly { als.slot := position } } /// @dev Contains business logic for validating a contract address. /// @param _contract address of the dex to check function _checkAddress(address _contract) private view { if (_contract == address(0)) revert InvalidContract(); if (_contract.code.length == 0) revert InvalidContract(); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "./LibBytes.sol"; library LibUtil { using LibBytes for bytes; function getRevertMsg( bytes memory _res ) internal pure returns (string memory) { // If the _res length is less than 68, then the transaction failed silently (without a revert message) if (_res.length < 68) return "Transaction reverted silently"; bytes memory revertData = _res.slice(4, _res.length - 4); // Remove the selector which is the first 4 bytes return abi.decode(revertData, (string)); // All that remains is the revert string } /// @notice Determines whether the given address is the zero address /// @param addr The address to verify /// @return Boolean indicating if the address is the zero address function isZeroAddress(address addr) internal pure returns (bool) { return addr == address(0); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; library LibBytes { // solhint-disable no-inline-assembly // LibBytes specific errors error SliceOverflow(); error SliceOutOfBounds(); error AddressOutOfBounds(); bytes16 private constant _SYMBOLS = "0123456789abcdef"; // ------------------------- function slice( bytes memory _bytes, uint256 _start, uint256 _length ) internal pure returns (bytes memory) { if (_length + 31 < _length) revert SliceOverflow(); if (_bytes.length < _start + _length) revert SliceOutOfBounds(); bytes memory tempBytes; assembly { switch iszero(_length) case 0 { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // The first word of the slice result is potentially a partial // word read from the original array. To read it, we calculate // the length of that partial word and start copying that many // bytes into the array. The first word we copy will start with // data we don't care about, but the last `lengthmod` bytes will // land at the beginning of the contents of the new array. When // we're done copying, we overwrite the full first word with // the actual length of the slice. let lengthmod := and(_length, 31) // The multiplication in the next line is necessary // because when slicing multiples of 32 bytes (lengthmod == 0) // the following copy loop was copying the origin's length // and then ending prematurely not copying everything it should. let mc := add( add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)) ) let end := add(mc, _length) for { // The multiplication in the next line has the same exact purpose // as the one above. let cc := add( add( add(_bytes, lengthmod), mul(0x20, iszero(lengthmod)) ), _start ) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } mstore(tempBytes, _length) //update free-memory pointer //allocating the array padded to 32 bytes like the compiler does now mstore(0x40, and(add(mc, 31), not(31))) } //if we want a zero-length slice let's just return a zero-length array default { tempBytes := mload(0x40) //zero out the 32 bytes slice we are about to return //we need to do it because Solidity does not garbage collect mstore(tempBytes, 0) mstore(0x40, add(tempBytes, 0x20)) } } return tempBytes; } function toAddress( bytes memory _bytes, uint256 _start ) internal pure returns (address) { if (_bytes.length < _start + 20) { revert AddressOutOfBounds(); } address tempAddress; assembly { tempAddress := div( mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000 ) } return tempAddress; } /// Copied from OpenZeppelin's `Strings.sol` utility library. /// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/8335676b0e99944eef6a742e16dcd9ff6e68e609/contracts/utils/Strings.sol function toHexString( uint256 value, uint256 length ) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
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Contract ABI
API[{"inputs":[{"internalType":"contract IConnextHandler","name":"_connextHandler","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CannotBridgeToSameNetwork","type":"error"},{"inputs":[],"name":"ContractCallNotAllowed","type":"error"},{"inputs":[{"internalType":"uint256","name":"minAmount","type":"uint256"},{"internalType":"uint256","name":"receivedAmount","type":"uint256"}],"name":"CumulativeSlippageTooHigh","type":"error"},{"inputs":[],"name":"InformationMismatch","type":"error"},{"inputs":[{"internalType":"uint256","name":"required","type":"uint256"},{"internalType":"uint256","name":"balance","type":"uint256"}],"name":"InsufficientBalance","type":"error"},{"inputs":[],"name":"InvalidAmount","type":"error"},{"inputs":[],"name":"InvalidContract","type":"error"},{"inputs":[],"name":"InvalidReceiver","type":"error"},{"inputs":[],"name":"NativeAssetNotSupported","type":"error"},{"inputs":[],"name":"NativeAssetTransferFailed","type":"error"},{"inputs":[],"name":"NoSwapDataProvided","type":"error"},{"inputs":[],"name":"NoSwapFromZeroBalance","type":"error"},{"inputs":[],"name":"NoTransferToNullAddress","type":"error"},{"inputs":[],"name":"NullAddrIsNotAValidSpender","type":"error"},{"inputs":[],"name":"NullAddrIsNotAnERC20Token","type":"error"},{"inputs":[],"name":"ReentrancyError","type":"error"},{"inputs":[],"name":"SliceOutOfBounds","type":"error"},{"inputs":[],"name":"SliceOverflow","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"indexed":false,"internalType":"string","name":"integrator","type":"string"},{"indexed":false,"internalType":"string","name":"referrer","type":"string"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"address","name":"fromAssetId","type":"address"},{"indexed":false,"internalType":"address","name":"toAssetId","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"toAmount","type":"uint256"}],"name":"LiFiGenericSwapCompleted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"indexed":false,"internalType":"string","name":"integrator","type":"string"},{"indexed":false,"internalType":"string","name":"referrer","type":"string"},{"indexed":false,"internalType":"address","name":"fromAssetId","type":"address"},{"indexed":false,"internalType":"address","name":"toAssetId","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"toAmount","type":"uint256"}],"name":"LiFiSwappedGeneric","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"indexed":false,"internalType":"address","name":"receivingAssetId","type":"address"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"LiFiTransferCompleted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"indexed":false,"internalType":"address","name":"receivingAssetId","type":"address"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"LiFiTransferRecovered","type":"event"},{"anonymous":false,"inputs":[{"components":[{"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"internalType":"string","name":"bridge","type":"string"},{"internalType":"string","name":"integrator","type":"string"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"address","name":"sendingAssetId","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"minAmount","type":"uint256"},{"internalType":"uint256","name":"destinationChainId","type":"uint256"},{"internalType":"bool","name":"hasSourceSwaps","type":"bool"},{"internalType":"bool","name":"hasDestinationCall","type":"bool"}],"indexed":false,"internalType":"struct ILiFi.BridgeData","name":"bridgeData","type":"tuple"}],"name":"LiFiTransferStarted","type":"event"},{"inputs":[{"components":[{"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"internalType":"string","name":"bridge","type":"string"},{"internalType":"string","name":"integrator","type":"string"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"address","name":"sendingAssetId","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"minAmount","type":"uint256"},{"internalType":"uint256","name":"destinationChainId","type":"uint256"},{"internalType":"bool","name":"hasSourceSwaps","type":"bool"},{"internalType":"bool","name":"hasDestinationCall","type":"bool"}],"internalType":"struct ILiFi.BridgeData","name":"_bridgeData","type":"tuple"},{"components":[{"internalType":"bytes","name":"callData","type":"bytes"},{"internalType":"address","name":"callTo","type":"address"},{"internalType":"uint256","name":"relayerFee","type":"uint256"},{"internalType":"uint256","name":"slippageTol","type":"uint256"},{"internalType":"address","name":"delegate","type":"address"},{"internalType":"uint32","name":"destChainDomainId","type":"uint32"},{"internalType":"bool","name":"payFeeWithSendingAsset","type":"bool"}],"internalType":"struct AmarokFacet.AmarokData","name":"_amarokData","type":"tuple"}],"name":"startBridgeTokensViaAmarok","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"internalType":"string","name":"bridge","type":"string"},{"internalType":"string","name":"integrator","type":"string"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"address","name":"sendingAssetId","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"minAmount","type":"uint256"},{"internalType":"uint256","name":"destinationChainId","type":"uint256"},{"internalType":"bool","name":"hasSourceSwaps","type":"bool"},{"internalType":"bool","name":"hasDestinationCall","type":"bool"}],"internalType":"struct ILiFi.BridgeData","name":"_bridgeData","type":"tuple"},{"components":[{"internalType":"address","name":"callTo","type":"address"},{"internalType":"address","name":"approveTo","type":"address"},{"internalType":"address","name":"sendingAssetId","type":"address"},{"internalType":"address","name":"receivingAssetId","type":"address"},{"internalType":"uint256","name":"fromAmount","type":"uint256"},{"internalType":"bytes","name":"callData","type":"bytes"},{"internalType":"bool","name":"requiresDeposit","type":"bool"}],"internalType":"struct LibSwap.SwapData[]","name":"_swapData","type":"tuple[]"},{"components":[{"internalType":"bytes","name":"callData","type":"bytes"},{"internalType":"address","name":"callTo","type":"address"},{"internalType":"uint256","name":"relayerFee","type":"uint256"},{"internalType":"uint256","name":"slippageTol","type":"uint256"},{"internalType":"address","name":"delegate","type":"address"},{"internalType":"uint32","name":"destChainDomainId","type":"uint32"},{"internalType":"bool","name":"payFeeWithSendingAsset","type":"bool"}],"internalType":"struct AmarokFacet.AmarokData","name":"_amarokData","type":"tuple"}],"name":"swapAndStartBridgeTokensViaAmarok","outputs":[],"stateMutability":"payable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a05ef29e9ac8c75c530c2795fa6a800e188de0a9
-----Decoded View---------------
Arg [0] : _connextHandler (address): 0xa05eF29e9aC8C75c530c2795Fa6A800e188dE0a9
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a05ef29e9ac8c75c530c2795fa6a800e188de0a9
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Multichain Portfolio | 34 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.