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Contract Name:
GnosisBridgeFacet
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 10000 runs
Other Settings:
default 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 { IXDaiBridge } from "../Interfaces/IXDaiBridge.sol"; import { LibAsset, IERC20 } from "../Libraries/LibAsset.sol"; import { ReentrancyGuard } from "../Helpers/ReentrancyGuard.sol"; import { InvalidAmount } from "../Errors/GenericErrors.sol"; import { InvalidAmount, InvalidSendingToken, InvalidDestinationChain, InvalidReceiver } from "../Errors/GenericErrors.sol"; import { SwapperV2, LibSwap } from "../Helpers/SwapperV2.sol"; import { LibUtil } from "../Libraries/LibUtil.sol"; import { Validatable } from "../Helpers/Validatable.sol"; /// @title Gnosis Bridge Facet /// @author LI.FI (https://li.fi) /// @notice Provides functionality for bridging through XDaiBridge contract GnosisBridgeFacet is ILiFi, ReentrancyGuard, SwapperV2, Validatable { /// Storage /// /// @notice The DAI address on the source chain. address private constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F; /// @notice The chain id of Gnosis. uint64 private constant GNOSIS_CHAIN_ID = 100; /// @notice The contract address of the xdai bridge on the source chain. IXDaiBridge private immutable xDaiBridge; /// Constructor /// /// @notice Initialize the contract. /// @param _xDaiBridge The contract address of the xdai bridge on the source chain. constructor(IXDaiBridge _xDaiBridge) { xDaiBridge = _xDaiBridge; } /// External Methods /// /// @notice Bridges tokens via XDaiBridge /// @param _bridgeData the core information needed for bridging function startBridgeTokensViaXDaiBridge(ILiFi.BridgeData memory _bridgeData) external payable refundExcessNative(payable(msg.sender)) doesNotContainSourceSwaps(_bridgeData) doesNotContainDestinationCalls(_bridgeData) validateBridgeData(_bridgeData) onlyAllowDestinationChain(_bridgeData, GNOSIS_CHAIN_ID) onlyAllowSourceToken(_bridgeData, DAI) nonReentrant { LibAsset.depositAsset(DAI, _bridgeData.minAmount); _startBridge(_bridgeData); } /// @notice Performs a swap before bridging via XDaiBridge /// @param _bridgeData the core information needed for bridging /// @param _swapData an object containing swap related data to perform swaps before bridging function swapAndStartBridgeTokensViaXDaiBridge( ILiFi.BridgeData memory _bridgeData, LibSwap.SwapData[] calldata _swapData ) external payable containsSourceSwaps(_bridgeData) doesNotContainDestinationCalls(_bridgeData) validateBridgeData(_bridgeData) onlyAllowDestinationChain(_bridgeData, GNOSIS_CHAIN_ID) onlyAllowSourceToken(_bridgeData, DAI) nonReentrant { if (_swapData[_swapData.length - 1].receivingAssetId != DAI) { revert InvalidSendingToken(); } _bridgeData.minAmount = _depositAndSwap( _bridgeData.transactionId, _bridgeData.minAmount, _swapData, payable(msg.sender) ); _startBridge(_bridgeData); } /// Private Methods /// /// @dev Contains the business logic for the bridge via XDaiBridge /// @param _bridgeData the core information needed for bridging function _startBridge(ILiFi.BridgeData memory _bridgeData) private { LibAsset.maxApproveERC20(IERC20(DAI), address(xDaiBridge), _bridgeData.minAmount); xDaiBridge.relayTokens(_bridgeData.receiver, _bridgeData.minAmount); emit LiFiTransferStarted(_bridgeData); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (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 // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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 v4.7.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-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; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } 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)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } 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"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } 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"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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 * ==== * * [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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(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) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(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) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason 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 { // 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; error TokenAddressIsZero(); error TokenNotSupported(); error CannotBridgeToSameNetwork(); error ZeroPostSwapBalance(); error NoSwapDataProvided(); error NativeValueWithERC(); error ContractCallNotAllowed(); error NullAddrIsNotAValidSpender(); error NullAddrIsNotAnERC20Token(); error NoTransferToNullAddress(); error NativeAssetTransferFailed(); error InvalidBridgeConfigLength(); error InvalidAmount(); error InvalidContract(); error InvalidConfig(); error UnsupportedChainId(uint256 chainId); error InvalidReceiver(); error InvalidDestinationChain(); error InvalidSendingToken(); error InvalidCaller(); error AlreadyInitialized(); error NotInitialized(); error OnlyContractOwner(); error CannotAuthoriseSelf(); error RecoveryAddressCannotBeZero(); error CannotDepositNativeToken(); error InvalidCallData(); error NativeAssetNotSupported(); error UnAuthorized(); error NoSwapFromZeroBalance(); error InvalidFallbackAddress(); error CumulativeSlippageTooHigh(uint256 minAmount, uint256 receivedAmount); error InsufficientBalance(uint256 required, uint256 balance); error ZeroAmount(); error InvalidFee(); error InformationMismatch(); error NotAContract(); error NotEnoughBalance(uint256 requested, uint256 available);
// 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; 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 { InvalidAmount, 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; uint256 excess = finalBalance > initialBalance ? finalBalance - initialBalance : 0; if (excess > 0) { LibAsset.transferAsset(LibAsset.NATIVE_ASSETID, _refundReceiver, excess); } } /// 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 (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 } 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(); } _; } 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 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 ); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; interface IXDaiBridge { /// @notice Bridge Dai to xDai and sends to receiver /// @dev It's implemented in xDaiBridge on only Ethereum /// @param receiver Receiver address /// @param amount Dai amount function relayTokens(address receiver, uint256 amount) external; }
// 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: UNLICENSED pragma solidity 0.8.17; import { InsufficientBalance, NullAddrIsNotAnERC20Token, NullAddrIsNotAValidSpender, NoTransferToNullAddress, InvalidAmount, NativeValueWithERC, 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 assetId == NATIVE_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 (address(assetId) == NATIVE_ASSETID) return; if (spender == NULL_ADDRESS) revert NullAddrIsNotAValidSpender(); uint256 allowance = assetId.allowance(address(this), spender); if (allowance < amount) SafeERC20.safeIncreaseAllowance(IERC20(assetId), spender, MAX_UINT - allowance); } /// @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(); 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 (assetId == NATIVE_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 (isNativeAsset(assetId)) { if (msg.value < amount) revert InvalidAmount(); } else { if (amount == 0) revert InvalidAmount(); 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 memory 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 { (assetId == NATIVE_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: MIT pragma solidity 0.8.17; library LibBytes { // solhint-disable no-inline-assembly // LibBytes specific errors error SliceOverflow(); error SliceOutOfBounds(); error AddressOutOfBounds(); error UintOutOfBounds(); // ------------------------- function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) { bytes memory tempBytes; assembly { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // Store the length of the first bytes array at the beginning of // the memory for tempBytes. let length := mload(_preBytes) mstore(tempBytes, length) // Maintain a memory counter for the current write location in the // temp bytes array by adding the 32 bytes for the array length to // the starting location. let mc := add(tempBytes, 0x20) // Stop copying when the memory counter reaches the length of the // first bytes array. let end := add(mc, length) for { // Initialize a copy counter to the start of the _preBytes data, // 32 bytes into its memory. let cc := add(_preBytes, 0x20) } lt(mc, end) { // Increase both counters by 32 bytes each iteration. mc := add(mc, 0x20) cc := add(cc, 0x20) } { // Write the _preBytes data into the tempBytes memory 32 bytes // at a time. mstore(mc, mload(cc)) } // Add the length of _postBytes to the current length of tempBytes // and store it as the new length in the first 32 bytes of the // tempBytes memory. length := mload(_postBytes) mstore(tempBytes, add(length, mload(tempBytes))) // Move the memory counter back from a multiple of 0x20 to the // actual end of the _preBytes data. mc := end // Stop copying when the memory counter reaches the new combined // length of the arrays. end := add(mc, length) for { let cc := add(_postBytes, 0x20) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } // Update the free-memory pointer by padding our last write location // to 32 bytes: add 31 bytes to the end of tempBytes to move to the // next 32 byte block, then round down to the nearest multiple of // 32. If the sum of the length of the two arrays is zero then add // one before rounding down to leave a blank 32 bytes (the length block with 0). mstore( 0x40, and( add(add(end, iszero(add(length, mload(_preBytes)))), 31), not(31) // Round down to the nearest 32 bytes. ) ) } return tempBytes; } function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal { assembly { // Read the first 32 bytes of _preBytes storage, which is the length // of the array. (We don't need to use the offset into the slot // because arrays use the entire slot.) let fslot := sload(_preBytes.slot) // Arrays of 31 bytes or less have an even value in their slot, // while longer arrays have an odd value. The actual length is // the slot divided by two for odd values, and the lowest order // byte divided by two for even values. // If the slot is even, bitwise and the slot with 255 and divide by // two to get the length. If the slot is odd, bitwise and the slot // with -1 and divide by two. let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) let newlength := add(slength, mlength) // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage switch add(lt(slength, 32), lt(newlength, 32)) case 2 { // Since the new array still fits in the slot, we just need to // update the contents of the slot. // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length sstore( _preBytes.slot, // all the modifications to the slot are inside this // next block add( // we can just add to the slot contents because the // bytes we want to change are the LSBs fslot, add( mul( div( // load the bytes from memory mload(add(_postBytes, 0x20)), // zero all bytes to the right exp(0x100, sub(32, mlength)) ), // and now shift left the number of bytes to // leave space for the length in the slot exp(0x100, sub(32, newlength)) ), // increase length by the double of the memory // bytes length mul(mlength, 2) ) ) ) } case 1 { // The stored value fits in the slot, but the combined value // will exceed it. // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // The contents of the _postBytes array start 32 bytes into // the structure. Our first read should obtain the `submod` // bytes that can fit into the unused space in the last word // of the stored array. To get this, we read 32 bytes starting // from `submod`, so the data we read overlaps with the array // contents by `submod` bytes. Masking the lowest-order // `submod` bytes allows us to add that value directly to the // stored value. let submod := sub(32, slength) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore( sc, add( and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00), and(mload(mc), mask) ) ) for { mc := add(mc, 0x20) sc := add(sc, 1) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } default { // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) // Start copying to the last used word of the stored array. let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // Copy over the first `submod` bytes of the new data as in // case 1 above. let slengthmod := mod(slength, 32) let submod := sub(32, slengthmod) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore(sc, add(sload(sc), and(mload(mc), mask))) for { sc := add(sc, 1) mc := add(mc, 0x20) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } } } 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; } function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) { if (_bytes.length < _start + 1) { revert UintOutOfBounds(); } uint8 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x1), _start)) } return tempUint; } function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) { if (_bytes.length < _start + 2) { revert UintOutOfBounds(); } uint16 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x2), _start)) } return tempUint; } function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) { if (_bytes.length < _start + 4) { revert UintOutOfBounds(); } uint32 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x4), _start)) } return tempUint; } function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) { if (_bytes.length < _start + 8) { revert UintOutOfBounds(); } uint64 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x8), _start)) } return tempUint; } function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) { if (_bytes.length < _start + 12) { revert UintOutOfBounds(); } uint96 tempUint; assembly { tempUint := mload(add(add(_bytes, 0xc), _start)) } return tempUint; } function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) { if (_bytes.length < _start + 16) { revert UintOutOfBounds(); } uint128 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x10), _start)) } return tempUint; } function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) { if (_bytes.length < _start + 32) { revert UintOutOfBounds(); } uint256 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x20), _start)) } return tempUint; } function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) { if (_bytes.length < _start + 32) { revert UintOutOfBounds(); } bytes32 tempBytes32; assembly { tempBytes32 := mload(add(add(_bytes, 0x20), _start)) } return tempBytes32; } function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) { bool success = true; assembly { let length := mload(_preBytes) // if lengths don't match the arrays are not equal switch eq(length, mload(_postBytes)) case 1 { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 let mc := add(_preBytes, 0x20) let end := add(mc, length) for { let cc := add(_postBytes, 0x20) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) } eq(add(lt(mc, end), cb), 2) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { // if any of these checks fails then arrays are not equal if iszero(eq(mload(mc), mload(cc))) { // unsuccess: success := 0 cb := 0 } } } default { // unsuccess: success := 0 } } return success; } function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) { bool success = true; assembly { // we know _preBytes_offset is 0 let fslot := sload(_preBytes.slot) // Decode the length of the stored array like in concatStorage(). let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) // if lengths don't match the arrays are not equal switch eq(slength, mlength) case 1 { // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage if iszero(iszero(slength)) { switch lt(slength, 32) case 1 { // blank the last byte which is the length fslot := mul(div(fslot, 0x100), 0x100) if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) { // unsuccess: success := 0 } } default { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := keccak256(0x0, 0x20) let mc := add(_postBytes, 0x20) let end := add(mc, mlength) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) // solhint-disable-next-line no-empty-blocks for { } eq(add(lt(mc, end), cb), 2) { sc := add(sc, 1) mc := add(mc, 0x20) } { if iszero(eq(sload(sc), mload(mc))) { // unsuccess: success := 0 cb := 0 } } } } } default { // unsuccess: success := 0 } } return success; } }
// 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 "./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); } }
{ "remappings": [ "@axelar-network/=node_modules/@axelar-network/", "@connext/=node_modules/@connext/", "@eth-optimism/=node_modules/@hop-protocol/sdk/node_modules/@eth-optimism/", "@openzeppelin/=node_modules/@openzeppelin/", "@uniswap/=node_modules/@uniswap/", "create3-factory/=lib/create3-factory/src/", "ds-test/=lib/ds-test/src/", "eth-gas-reporter/=node_modules/eth-gas-reporter/", "forge-std/=lib/forge-std/src/", "hardhat-deploy/=node_modules/hardhat-deploy/", "hardhat/=node_modules/hardhat/", "lifi/=src/", "solmate/=lib/solmate/src/" ], "optimizer": { "enabled": true, "runs": 10000 }, "metadata": { "bytecodeHash": "ipfs" }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "london", "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"contract IXDaiBridge","name":"_xDaiBridge","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"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":"InvalidDestinationChain","type":"error"},{"inputs":[],"name":"InvalidReceiver","type":"error"},{"inputs":[],"name":"InvalidSendingToken","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":"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":[{"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"}],"name":"startBridgeTokensViaXDaiBridge","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[]"}],"name":"swapAndStartBridgeTokensViaXDaiBridge","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)
0000000000000000000000004aa42145aa6ebf72e164c9bbc74fbd3788045016
-----Decoded View---------------
Arg [0] : _xDaiBridge (address): 0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000004aa42145aa6ebf72e164c9bbc74fbd3788045016
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Multichain Portfolio | 30 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.