Contract Name:
CBridgeFacetPacked
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { ICBridge } from "../Interfaces/ICBridge.sol";
import { CBridgeFacet } from "./CBridgeFacet.sol";
import { ILiFi } from "../Interfaces/ILiFi.sol";
import { ERC20 } from "solmate/utils/SafeTransferLib.sol";
import { LibAsset, IERC20 } from "../Libraries/LibAsset.sol";
import { LibDiamond } from "../Libraries/LibDiamond.sol";
import { ContractCallNotAllowed, ExternalCallFailed } from "../Errors/GenericErrors.sol";
import { LibUtil } from "../Libraries/LibUtil.sol";
import { TransferrableOwnership } from "../Helpers/TransferrableOwnership.sol";
/// @title CBridge Facet Packed
/// @author LI.FI (https://li.fi)
/// @notice Provides functionality for bridging through CBridge
/// @custom:version 1.0.1
contract CBridgeFacetPacked is ILiFi, TransferrableOwnership {
/// Storage ///
/// @notice The contract address of the cbridge on the source chain.
ICBridge private immutable cBridge;
/// Events ///
event LiFiCBridgeTransfer(bytes8 _transactionId);
event CBridgeRefund(
address indexed _assetAddress,
address indexed _to,
uint256 amount
);
/// Constructor ///
/// @notice Initialize the contract.
/// @param _cBridge The contract address of the cbridge on the source chain.
constructor(
ICBridge _cBridge,
address _owner
) TransferrableOwnership(_owner) {
cBridge = _cBridge;
}
/// External Methods ///
/// @dev Only meant to be called outside of the context of the diamond
/// @notice Sets approval for the CBridge Router to spend the specified token
/// @param tokensToApprove The tokens to approve to the CBridge Router
function setApprovalForBridge(
address[] calldata tokensToApprove
) external onlyOwner {
for (uint256 i; i < tokensToApprove.length; i++) {
// Give CBridge approval to bridge tokens
LibAsset.maxApproveERC20(
IERC20(tokensToApprove[i]),
address(cBridge),
type(uint256).max
);
}
}
// This is needed to receive native asset if a refund asset is a native asset
receive() external payable {}
/// @notice Triggers a cBridge refund with calldata produced by cBridge API
/// @param _callTo The address to execute the calldata on
/// @param _callData The data to execute
/// @param _assetAddress Asset to be withdrawn
/// @param _to Address to withdraw to
/// @param _amount Amount of asset to withdraw
function triggerRefund(
address payable _callTo,
bytes calldata _callData,
address _assetAddress,
address _to,
uint256 _amount
) external onlyOwner {
// make sure that callTo address is either of the cBridge addresses
if (address(cBridge) != _callTo) {
revert ContractCallNotAllowed();
}
// call contract
bool success;
(success, ) = _callTo.call(_callData);
if (!success) {
revert ExternalCallFailed();
}
// forward funds to _to address and emit event
address sendTo = (LibUtil.isZeroAddress(_to)) ? msg.sender : _to;
LibAsset.transferAsset(_assetAddress, payable(sendTo), _amount);
emit CBridgeRefund(_assetAddress, sendTo, _amount);
}
/// @notice Bridges Native tokens via cBridge (packed)
/// No params, all data will be extracted from manually encoded callData
function startBridgeTokensViaCBridgeNativePacked() external payable {
cBridge.sendNative{ value: msg.value }(
address(bytes20(msg.data[12:32])), // receiver
msg.value, // amount
uint64(uint32(bytes4(msg.data[32:36]))), // destinationChainId
uint64(uint32(bytes4(msg.data[36:40]))), // nonce
uint32(bytes4(msg.data[40:44])) // maxSlippage
);
emit LiFiCBridgeTransfer(bytes8(msg.data[4:12])); // transactionId
}
/// @notice Bridges native tokens via cBridge
/// @param transactionId Custom transaction ID for tracking
/// @param receiver Receiving wallet address
/// @param destinationChainId Receiving chain
/// @param nonce A number input to guarantee uniqueness of transferId.
/// @param maxSlippage Destination swap minimal accepted amount
function startBridgeTokensViaCBridgeNativeMin(
bytes32 transactionId,
address receiver,
uint64 destinationChainId,
uint64 nonce,
uint32 maxSlippage
) external payable {
cBridge.sendNative{ value: msg.value }(
receiver,
msg.value,
destinationChainId,
nonce,
maxSlippage
);
emit LiFiCBridgeTransfer(bytes8(transactionId));
}
/// @notice Bridges ERC20 tokens via cBridge
/// No params, all data will be extracted from manually encoded callData
function startBridgeTokensViaCBridgeERC20Packed() external {
address sendingAssetId = address(bytes20(msg.data[36:56]));
uint256 amount = uint256(uint128(bytes16(msg.data[56:72])));
// Deposit assets
ERC20(sendingAssetId).transferFrom(msg.sender, address(this), amount);
// Bridge assets
// solhint-disable-next-line check-send-result
cBridge.send(
address(bytes20(msg.data[12:32])), // receiver
sendingAssetId, // sendingAssetId
amount, // amount
uint64(uint32(bytes4(msg.data[32:36]))), // destinationChainId
uint64(uint32(bytes4(msg.data[72:76]))), // nonce
uint32(bytes4(msg.data[76:80])) // maxSlippage
);
emit LiFiCBridgeTransfer(bytes8(msg.data[4:12]));
}
/// @notice Bridges ERC20 tokens via cBridge
/// @param transactionId Custom transaction ID for tracking
/// @param receiver Receiving wallet address
/// @param destinationChainId Receiving chain
/// @param sendingAssetId Address of the source asset to bridge
/// @param amount Amount of the source asset to bridge
/// @param nonce A number input to guarantee uniqueness of transferId
/// @param maxSlippage Destination swap minimal accepted amount
function startBridgeTokensViaCBridgeERC20Min(
bytes32 transactionId,
address receiver,
uint64 destinationChainId,
address sendingAssetId,
uint256 amount,
uint64 nonce,
uint32 maxSlippage
) external {
// Deposit assets
ERC20(sendingAssetId).transferFrom(msg.sender, address(this), amount);
// Bridge assets
// solhint-disable-next-line check-send-result
cBridge.send(
receiver,
sendingAssetId,
amount,
destinationChainId,
nonce,
maxSlippage
);
emit LiFiCBridgeTransfer(bytes8(transactionId));
}
/// Encoder/Decoders ///
/// @notice Encodes calldata for startBridgeTokensViaCBridgeNativePacked
/// @param transactionId Custom transaction ID for tracking
/// @param receiver Receiving wallet address
/// @param destinationChainId Receiving chain
/// @param nonce A number input to guarantee uniqueness of transferId.
/// @param maxSlippage Destination swap minimal accepted amount
function encode_startBridgeTokensViaCBridgeNativePacked(
bytes32 transactionId,
address receiver,
uint64 destinationChainId,
uint64 nonce,
uint32 maxSlippage
) external pure returns (bytes memory) {
require(
destinationChainId <= type(uint32).max,
"destinationChainId value passed too big to fit in uint32"
);
require(
nonce <= type(uint32).max,
"nonce value passed too big to fit in uint32"
);
return
bytes.concat(
CBridgeFacetPacked
.startBridgeTokensViaCBridgeNativePacked
.selector,
bytes8(transactionId),
bytes20(receiver),
bytes4(uint32(destinationChainId)),
bytes4(uint32(nonce)),
bytes4(maxSlippage)
);
}
/// @notice Decodes calldata for startBridgeTokensViaCBridgeNativePacked
/// @param _data the calldata to decode
function decode_startBridgeTokensViaCBridgeNativePacked(
bytes calldata _data
)
external
pure
returns (BridgeData memory, CBridgeFacet.CBridgeData memory)
{
require(
_data.length >= 44,
"data passed in is not the correct length"
);
BridgeData memory bridgeData;
CBridgeFacet.CBridgeData memory cBridgeData;
bridgeData.transactionId = bytes32(bytes8(_data[4:12]));
bridgeData.receiver = address(bytes20(_data[12:32]));
bridgeData.destinationChainId = uint64(uint32(bytes4(_data[32:36])));
cBridgeData.nonce = uint64(uint32(bytes4(_data[36:40])));
cBridgeData.maxSlippage = uint32(bytes4(_data[40:44]));
return (bridgeData, cBridgeData);
}
/// @notice Encodes calldata for startBridgeTokensViaCBridgeERC20Packed
/// @param transactionId Custom transaction ID for tracking
/// @param receiver Receiving wallet address
/// @param destinationChainId Receiving chain
/// @param sendingAssetId Address of the source asset to bridge
/// @param minAmount Amount of the source asset to bridge
/// @param nonce A number input to guarantee uniqueness of transferId
/// @param maxSlippage Destination swap minimal accepted amount
function encode_startBridgeTokensViaCBridgeERC20Packed(
bytes32 transactionId,
address receiver,
uint64 destinationChainId,
address sendingAssetId,
uint256 minAmount,
uint64 nonce,
uint32 maxSlippage
) external pure returns (bytes memory) {
require(
destinationChainId <= type(uint32).max,
"destinationChainId value passed too big to fit in uint32"
);
require(
minAmount <= type(uint128).max,
"amount value passed too big to fit in uint128"
);
require(
nonce <= type(uint32).max,
"nonce value passed too big to fit in uint32"
);
return
bytes.concat(
CBridgeFacetPacked
.startBridgeTokensViaCBridgeERC20Packed
.selector,
bytes8(transactionId),
bytes20(receiver),
bytes4(uint32(destinationChainId)),
bytes20(sendingAssetId),
bytes16(uint128(minAmount)),
bytes4(uint32(nonce)),
bytes4(maxSlippage)
);
}
function decode_startBridgeTokensViaCBridgeERC20Packed(
bytes calldata _data
)
external
pure
returns (BridgeData memory, CBridgeFacet.CBridgeData memory)
{
require(_data.length >= 80, "data passed is not the correct length");
BridgeData memory bridgeData;
CBridgeFacet.CBridgeData memory cBridgeData;
bridgeData.transactionId = bytes32(bytes8(_data[4:12]));
bridgeData.receiver = address(bytes20(_data[12:32]));
bridgeData.destinationChainId = uint64(uint32(bytes4(_data[32:36])));
bridgeData.sendingAssetId = address(bytes20(_data[36:56]));
bridgeData.minAmount = uint256(uint128(bytes16(_data[56:72])));
cBridgeData.nonce = uint64(uint32(bytes4(_data[72:76])));
cBridgeData.maxSlippage = uint32(bytes4(_data[76:80]));
return (bridgeData, cBridgeData);
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
interface ICBridge {
/// @notice Send a cross-chain transfer via the liquidity pool-based bridge.
/// @dev This function DOES NOT SUPPORT fee-on-transfer / rebasing tokens.
/// @param _receiver The address of the receiver.
/// @param _token The address of the token.
/// @param _amount The amount of the transfer.
/// @param _dstChainId The destination chain ID.
/// @param _nonce A number input to guarantee uniqueness of transferId. Can be timestamp in practice.
/// @param _maxSlippage The max slippage accepted, given as percentage in point (pip).
/// Eg. 5000 means 0.5%. Must be greater than minimalMaxSlippage.
/// Receiver is guaranteed to receive at least (100% - max slippage percentage) * amount
/// or the transfer can be refunded.
function send(
address _receiver,
address _token,
uint256 _amount,
uint64 _dstChainId,
uint64 _nonce,
uint32 _maxSlippage
) external;
/// @notice Send a cross-chain transfer via the liquidity pool-based bridge using the native token.
/// @param _receiver The address of the receiver.
/// @param _amount The amount of the transfer.
/// @param _dstChainId The destination chain ID.
/// @param _nonce A unique number. Can be timestamp in practice.
/// @param _maxSlippage The max slippage accepted, given as percentage in point (pip).
/// Eg. 5000 means 0.5%. Must be greater than minimalMaxSlippage.
/// Receiver is guaranteed to receive at least (100% - max slippage percentage) * amount
/// or the transfer can be refunded.
function sendNative(
address _receiver,
uint256 _amount,
uint64 _dstChainId,
uint64 _nonce,
uint32 _maxSlippage
) external payable;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { LibDiamond } from "../Libraries/LibDiamond.sol";
import { LibUtil } from "../Libraries/LibUtil.sol";
import { LibAsset, IERC20 } from "../Libraries/LibAsset.sol";
import { LibAccess } from "../Libraries/LibAccess.sol";
import { ILiFi } from "../Interfaces/ILiFi.sol";
import { ICBridge } from "../Interfaces/ICBridge.sol";
import { ReentrancyGuard } from "../Helpers/ReentrancyGuard.sol";
import { CannotBridgeToSameNetwork } from "../Errors/GenericErrors.sol";
import { SwapperV2, LibSwap } from "../Helpers/SwapperV2.sol";
import { Validatable } from "../Helpers/Validatable.sol";
import { ContractCallNotAllowed, ExternalCallFailed } from "../Errors/GenericErrors.sol";
/// @title CBridge Facet
/// @author LI.FI (https://li.fi)
/// @notice Provides functionality for bridging through CBridge
/// @custom:version 1.0.0
contract CBridgeFacet is ILiFi, ReentrancyGuard, SwapperV2, Validatable {
/// Storage ///
/// @notice The contract address of the cbridge on the source chain.
ICBridge private immutable cBridge;
/// Types ///
/// @param maxSlippage The max slippage accepted, given as percentage in point (pip).
/// @param nonce A number input to guarantee uniqueness of transferId.
/// Can be timestamp in practice.
struct CBridgeData {
uint32 maxSlippage;
uint64 nonce;
}
/// Events ///
event CBridgeRefund(
address indexed _assetAddress,
address indexed _to,
uint256 amount
);
/// Constructor ///
/// @notice Initialize the contract.
/// @param _cBridge The contract address of the cbridge on the source chain.
constructor(ICBridge _cBridge) {
cBridge = _cBridge;
}
/// External Methods ///
/// @notice Bridges tokens via CBridge
/// @param _bridgeData the core information needed for bridging
/// @param _cBridgeData data specific to CBridge
function startBridgeTokensViaCBridge(
ILiFi.BridgeData memory _bridgeData,
CBridgeData calldata _cBridgeData
)
external
payable
nonReentrant
refundExcessNative(payable(msg.sender))
doesNotContainSourceSwaps(_bridgeData)
doesNotContainDestinationCalls(_bridgeData)
validateBridgeData(_bridgeData)
{
LibAsset.depositAsset(
_bridgeData.sendingAssetId,
_bridgeData.minAmount
);
_startBridge(_bridgeData, _cBridgeData);
}
/// @notice Performs a swap before bridging via CBridge
/// @param _bridgeData the core information needed for bridging
/// @param _swapData an array of swap related data for performing swaps before bridging
/// @param _cBridgeData data specific to CBridge
function swapAndStartBridgeTokensViaCBridge(
ILiFi.BridgeData memory _bridgeData,
LibSwap.SwapData[] calldata _swapData,
CBridgeData calldata _cBridgeData
)
external
payable
nonReentrant
refundExcessNative(payable(msg.sender))
containsSourceSwaps(_bridgeData)
doesNotContainDestinationCalls(_bridgeData)
validateBridgeData(_bridgeData)
{
_bridgeData.minAmount = _depositAndSwap(
_bridgeData.transactionId,
_bridgeData.minAmount,
_swapData,
payable(msg.sender)
);
_startBridge(_bridgeData, _cBridgeData);
}
/// @notice Triggers a cBridge refund with calldata produced by cBridge API
/// @param _callTo The address to execute the calldata on
/// @param _callData The data to execute
/// @param _assetAddress Asset to be withdrawn
/// @param _to Address to withdraw to
/// @param _amount Amount of asset to withdraw
function triggerRefund(
address payable _callTo,
bytes calldata _callData,
address _assetAddress,
address _to,
uint256 _amount
) external {
if (msg.sender != LibDiamond.contractOwner()) {
LibAccess.enforceAccessControl();
}
// make sure that callTo address is either of the cBridge addresses
if (address(cBridge) != _callTo) {
revert ContractCallNotAllowed();
}
// call contract
bool success;
(success, ) = _callTo.call(_callData);
if (!success) {
revert ExternalCallFailed();
}
// forward funds to _to address and emit event
address sendTo = (LibUtil.isZeroAddress(_to)) ? msg.sender : _to;
LibAsset.transferAsset(_assetAddress, payable(sendTo), _amount);
emit CBridgeRefund(_assetAddress, sendTo, _amount);
}
/// Private Methods ///
/// @dev Contains the business logic for the bridge via CBridge
/// @param _bridgeData the core information needed for bridging
/// @param _cBridgeData data specific to CBridge
function _startBridge(
ILiFi.BridgeData memory _bridgeData,
CBridgeData calldata _cBridgeData
) private {
if (LibAsset.isNativeAsset(_bridgeData.sendingAssetId)) {
cBridge.sendNative{ value: _bridgeData.minAmount }(
_bridgeData.receiver,
_bridgeData.minAmount,
uint64(_bridgeData.destinationChainId),
_cBridgeData.nonce,
_cBridgeData.maxSlippage
);
} else {
// Give CBridge approval to bridge tokens
LibAsset.maxApproveERC20(
IERC20(_bridgeData.sendingAssetId),
address(cBridge),
_bridgeData.minAmount
);
// solhint-disable check-send-result
cBridge.send(
_bridgeData.receiver,
_bridgeData.sendingAssetId,
_bridgeData.minAmount,
uint64(_bridgeData.destinationChainId),
_cBridgeData.nonce,
_cBridgeData.maxSlippage
);
}
emit LiFiTransferStarted(_bridgeData);
}
}
// 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: AGPL-3.0-only
pragma solidity >=0.8.0;
import {ERC20} from "../tokens/ERC20.sol";
/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
/*//////////////////////////////////////////////////////////////
ETH OPERATIONS
//////////////////////////////////////////////////////////////*/
function safeTransferETH(address to, uint256 amount) internal {
bool success;
/// @solidity memory-safe-assembly
assembly {
// Transfer the ETH and store if it succeeded or not.
success := call(gas(), to, amount, 0, 0, 0, 0)
}
require(success, "ETH_TRANSFER_FAILED");
}
/*//////////////////////////////////////////////////////////////
ERC20 OPERATIONS
//////////////////////////////////////////////////////////////*/
function safeTransferFrom(
ERC20 token,
address from,
address to,
uint256 amount
) internal {
bool success;
/// @solidity memory-safe-assembly
assembly {
// Get a pointer to some free memory.
let freeMemoryPointer := mload(0x40)
// Write the abi-encoded calldata into memory, beginning with the function selector.
mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.
success := and(
// Set success to whether the call reverted, if not we check it either
// returned exactly 1 (can't just be non-zero data), or had no return data.
or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
// We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
// We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
// Counterintuitively, this call must be positioned second to the or() call in the
// surrounding and() call or else returndatasize() will be zero during the computation.
call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
)
}
require(success, "TRANSFER_FROM_FAILED");
}
function safeTransfer(
ERC20 token,
address to,
uint256 amount
) internal {
bool success;
/// @solidity memory-safe-assembly
assembly {
// Get a pointer to some free memory.
let freeMemoryPointer := mload(0x40)
// Write the abi-encoded calldata into memory, beginning with the function selector.
mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.
success := and(
// Set success to whether the call reverted, if not we check it either
// returned exactly 1 (can't just be non-zero data), or had no return data.
or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
// We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
// We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
// Counterintuitively, this call must be positioned second to the or() call in the
// surrounding and() call or else returndatasize() will be zero during the computation.
call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
)
}
require(success, "TRANSFER_FAILED");
}
function safeApprove(
ERC20 token,
address to,
uint256 amount
) internal {
bool success;
/// @solidity memory-safe-assembly
assembly {
// Get a pointer to some free memory.
let freeMemoryPointer := mload(0x40)
// Write the abi-encoded calldata into memory, beginning with the function selector.
mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.
success := and(
// Set success to whether the call reverted, if not we check it either
// returned exactly 1 (can't just be non-zero data), or had no return data.
or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
// We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
// We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
// Counterintuitively, this call must be positioned second to the or() call in the
// surrounding and() call or else returndatasize() will be zero during the computation.
call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
)
}
require(success, "APPROVE_FAILED");
}
}
// 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: MIT
pragma solidity 0.8.17;
import { IDiamondCut } from "../Interfaces/IDiamondCut.sol";
import { LibUtil } from "../Libraries/LibUtil.sol";
import { OnlyContractOwner } from "../Errors/GenericErrors.sol";
/// Implementation of EIP-2535 Diamond Standard
/// https://eips.ethereum.org/EIPS/eip-2535
library LibDiamond {
bytes32 internal constant DIAMOND_STORAGE_POSITION =
keccak256("diamond.standard.diamond.storage");
// Diamond specific errors
error IncorrectFacetCutAction();
error NoSelectorsInFace();
error FunctionAlreadyExists();
error FacetAddressIsZero();
error FacetAddressIsNotZero();
error FacetContainsNoCode();
error FunctionDoesNotExist();
error FunctionIsImmutable();
error InitZeroButCalldataNotEmpty();
error CalldataEmptyButInitNotZero();
error InitReverted();
// ----------------
struct FacetAddressAndPosition {
address facetAddress;
uint96 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
}
struct FacetFunctionSelectors {
bytes4[] functionSelectors;
uint256 facetAddressPosition; // position of facetAddress in facetAddresses array
}
struct DiamondStorage {
// maps function selector to the facet address and
// the position of the selector in the facetFunctionSelectors.selectors array
mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
// maps facet addresses to function selectors
mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
// facet addresses
address[] facetAddresses;
// Used to query if a contract implements an interface.
// Used to implement ERC-165.
mapping(bytes4 => bool) supportedInterfaces;
// owner of the contract
address contractOwner;
}
function diamondStorage()
internal
pure
returns (DiamondStorage storage ds)
{
bytes32 position = DIAMOND_STORAGE_POSITION;
// solhint-disable-next-line no-inline-assembly
assembly {
ds.slot := position
}
}
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
function setContractOwner(address _newOwner) internal {
DiamondStorage storage ds = diamondStorage();
address previousOwner = ds.contractOwner;
ds.contractOwner = _newOwner;
emit OwnershipTransferred(previousOwner, _newOwner);
}
function contractOwner() internal view returns (address contractOwner_) {
contractOwner_ = diamondStorage().contractOwner;
}
function enforceIsContractOwner() internal view {
if (msg.sender != diamondStorage().contractOwner)
revert OnlyContractOwner();
}
event DiamondCut(
IDiamondCut.FacetCut[] _diamondCut,
address _init,
bytes _calldata
);
// Internal function version of diamondCut
function diamondCut(
IDiamondCut.FacetCut[] memory _diamondCut,
address _init,
bytes memory _calldata
) internal {
for (uint256 facetIndex; facetIndex < _diamondCut.length; ) {
IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
if (action == IDiamondCut.FacetCutAction.Add) {
addFunctions(
_diamondCut[facetIndex].facetAddress,
_diamondCut[facetIndex].functionSelectors
);
} else if (action == IDiamondCut.FacetCutAction.Replace) {
replaceFunctions(
_diamondCut[facetIndex].facetAddress,
_diamondCut[facetIndex].functionSelectors
);
} else if (action == IDiamondCut.FacetCutAction.Remove) {
removeFunctions(
_diamondCut[facetIndex].facetAddress,
_diamondCut[facetIndex].functionSelectors
);
} else {
revert IncorrectFacetCutAction();
}
unchecked {
++facetIndex;
}
}
emit DiamondCut(_diamondCut, _init, _calldata);
initializeDiamondCut(_init, _calldata);
}
function addFunctions(
address _facetAddress,
bytes4[] memory _functionSelectors
) internal {
if (_functionSelectors.length == 0) {
revert NoSelectorsInFace();
}
DiamondStorage storage ds = diamondStorage();
if (LibUtil.isZeroAddress(_facetAddress)) {
revert FacetAddressIsZero();
}
uint96 selectorPosition = uint96(
ds.facetFunctionSelectors[_facetAddress].functionSelectors.length
);
// add new facet address if it does not exist
if (selectorPosition == 0) {
addFacet(ds, _facetAddress);
}
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = ds
.selectorToFacetAndPosition[selector]
.facetAddress;
if (!LibUtil.isZeroAddress(oldFacetAddress)) {
revert FunctionAlreadyExists();
}
addFunction(ds, selector, selectorPosition, _facetAddress);
unchecked {
++selectorPosition;
++selectorIndex;
}
}
}
function replaceFunctions(
address _facetAddress,
bytes4[] memory _functionSelectors
) internal {
if (_functionSelectors.length == 0) {
revert NoSelectorsInFace();
}
DiamondStorage storage ds = diamondStorage();
if (LibUtil.isZeroAddress(_facetAddress)) {
revert FacetAddressIsZero();
}
uint96 selectorPosition = uint96(
ds.facetFunctionSelectors[_facetAddress].functionSelectors.length
);
// add new facet address if it does not exist
if (selectorPosition == 0) {
addFacet(ds, _facetAddress);
}
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = ds
.selectorToFacetAndPosition[selector]
.facetAddress;
if (oldFacetAddress == _facetAddress) {
revert FunctionAlreadyExists();
}
removeFunction(ds, oldFacetAddress, selector);
addFunction(ds, selector, selectorPosition, _facetAddress);
unchecked {
++selectorPosition;
++selectorIndex;
}
}
}
function removeFunctions(
address _facetAddress,
bytes4[] memory _functionSelectors
) internal {
if (_functionSelectors.length == 0) {
revert NoSelectorsInFace();
}
DiamondStorage storage ds = diamondStorage();
// if function does not exist then do nothing and return
if (!LibUtil.isZeroAddress(_facetAddress)) {
revert FacetAddressIsNotZero();
}
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = ds
.selectorToFacetAndPosition[selector]
.facetAddress;
removeFunction(ds, oldFacetAddress, selector);
unchecked {
++selectorIndex;
}
}
}
function addFacet(
DiamondStorage storage ds,
address _facetAddress
) internal {
enforceHasContractCode(_facetAddress);
ds.facetFunctionSelectors[_facetAddress].facetAddressPosition = ds
.facetAddresses
.length;
ds.facetAddresses.push(_facetAddress);
}
function addFunction(
DiamondStorage storage ds,
bytes4 _selector,
uint96 _selectorPosition,
address _facetAddress
) internal {
ds
.selectorToFacetAndPosition[_selector]
.functionSelectorPosition = _selectorPosition;
ds.facetFunctionSelectors[_facetAddress].functionSelectors.push(
_selector
);
ds.selectorToFacetAndPosition[_selector].facetAddress = _facetAddress;
}
function removeFunction(
DiamondStorage storage ds,
address _facetAddress,
bytes4 _selector
) internal {
if (LibUtil.isZeroAddress(_facetAddress)) {
revert FunctionDoesNotExist();
}
// an immutable function is a function defined directly in a diamond
if (_facetAddress == address(this)) {
revert FunctionIsImmutable();
}
// replace selector with last selector, then delete last selector
uint256 selectorPosition = ds
.selectorToFacetAndPosition[_selector]
.functionSelectorPosition;
uint256 lastSelectorPosition = ds
.facetFunctionSelectors[_facetAddress]
.functionSelectors
.length - 1;
// if not the same then replace _selector with lastSelector
if (selectorPosition != lastSelectorPosition) {
bytes4 lastSelector = ds
.facetFunctionSelectors[_facetAddress]
.functionSelectors[lastSelectorPosition];
ds.facetFunctionSelectors[_facetAddress].functionSelectors[
selectorPosition
] = lastSelector;
ds
.selectorToFacetAndPosition[lastSelector]
.functionSelectorPosition = uint96(selectorPosition);
}
// delete the last selector
ds.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
delete ds.selectorToFacetAndPosition[_selector];
// if no more selectors for facet address then delete the facet address
if (lastSelectorPosition == 0) {
// replace facet address with last facet address and delete last facet address
uint256 lastFacetAddressPosition = ds.facetAddresses.length - 1;
uint256 facetAddressPosition = ds
.facetFunctionSelectors[_facetAddress]
.facetAddressPosition;
if (facetAddressPosition != lastFacetAddressPosition) {
address lastFacetAddress = ds.facetAddresses[
lastFacetAddressPosition
];
ds.facetAddresses[facetAddressPosition] = lastFacetAddress;
ds
.facetFunctionSelectors[lastFacetAddress]
.facetAddressPosition = facetAddressPosition;
}
ds.facetAddresses.pop();
delete ds
.facetFunctionSelectors[_facetAddress]
.facetAddressPosition;
}
}
function initializeDiamondCut(
address _init,
bytes memory _calldata
) internal {
if (LibUtil.isZeroAddress(_init)) {
if (_calldata.length != 0) {
revert InitZeroButCalldataNotEmpty();
}
} else {
if (_calldata.length == 0) {
revert CalldataEmptyButInitNotZero();
}
if (_init != address(this)) {
enforceHasContractCode(_init);
}
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory error) = _init.delegatecall(_calldata);
if (!success) {
if (error.length > 0) {
// bubble up the error
revert(string(error));
} else {
revert InitReverted();
}
}
}
}
function enforceHasContractCode(address _contract) internal view {
uint256 contractSize;
// solhint-disable-next-line no-inline-assembly
assembly {
contractSize := extcodesize(_contract)
}
if (contractSize == 0) {
revert FacetContainsNoCode();
}
}
}
// 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 "./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
pragma solidity 0.8.17;
import { IERC173 } from "../Interfaces/IERC173.sol";
import { LibAsset } from "../Libraries/LibAsset.sol";
contract TransferrableOwnership is IERC173 {
address public owner;
address public pendingOwner;
/// Errors ///
error UnAuthorized();
error NoNullOwner();
error NewOwnerMustNotBeSelf();
error NoPendingOwnershipTransfer();
error NotPendingOwner();
/// Events ///
event OwnershipTransferRequested(
address indexed _from,
address indexed _to
);
constructor(address initialOwner) {
owner = initialOwner;
}
modifier onlyOwner() {
if (msg.sender != owner) revert UnAuthorized();
_;
}
/// @notice Initiates transfer of ownership to a new address
/// @param _newOwner the address to transfer ownership to
function transferOwnership(address _newOwner) external onlyOwner {
if (_newOwner == LibAsset.NULL_ADDRESS) revert NoNullOwner();
if (_newOwner == msg.sender) revert NewOwnerMustNotBeSelf();
pendingOwner = _newOwner;
emit OwnershipTransferRequested(msg.sender, pendingOwner);
}
/// @notice Cancel transfer of ownership
function cancelOwnershipTransfer() external onlyOwner {
if (pendingOwner == LibAsset.NULL_ADDRESS)
revert NoPendingOwnershipTransfer();
pendingOwner = LibAsset.NULL_ADDRESS;
}
/// @notice Confirms transfer of ownership to the calling address (msg.sender)
function confirmOwnershipTransfer() external {
address _pendingOwner = pendingOwner;
if (msg.sender != _pendingOwner) revert NotPendingOwner();
emit OwnershipTransferred(owner, _pendingOwner);
owner = _pendingOwner;
pendingOwner = LibAsset.NULL_ADDRESS;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { CannotAuthoriseSelf, UnAuthorized } from "../Errors/GenericErrors.sol";
/// @title Access Library
/// @author LI.FI (https://li.fi)
/// @notice Provides functionality for managing method level access control
library LibAccess {
/// Types ///
bytes32 internal constant NAMESPACE =
keccak256("com.lifi.library.access.management");
/// Storage ///
struct AccessStorage {
mapping(bytes4 => mapping(address => bool)) execAccess;
}
/// Events ///
event AccessGranted(address indexed account, bytes4 indexed method);
event AccessRevoked(address indexed account, bytes4 indexed method);
/// @dev Fetch local storage
function accessStorage()
internal
pure
returns (AccessStorage storage accStor)
{
bytes32 position = NAMESPACE;
// solhint-disable-next-line no-inline-assembly
assembly {
accStor.slot := position
}
}
/// @notice Gives an address permission to execute a method
/// @param selector The method selector to execute
/// @param executor The address to grant permission to
function addAccess(bytes4 selector, address executor) internal {
if (executor == address(this)) {
revert CannotAuthoriseSelf();
}
AccessStorage storage accStor = accessStorage();
accStor.execAccess[selector][executor] = true;
emit AccessGranted(executor, selector);
}
/// @notice Revokes permission to execute a method
/// @param selector The method selector to execute
/// @param executor The address to revoke permission from
function removeAccess(bytes4 selector, address executor) internal {
AccessStorage storage accStor = accessStorage();
accStor.execAccess[selector][executor] = false;
emit AccessRevoked(executor, selector);
}
/// @notice Enforces access control by reverting if `msg.sender`
/// has not been given permission to execute `msg.sig`
function enforceAccessControl() internal view {
AccessStorage storage accStor = accessStorage();
if (accStor.execAccess[msg.sig][msg.sender] != true)
revert UnAuthorized();
}
}
// 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 { 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: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
/*//////////////////////////////////////////////////////////////
EVENTS
//////////////////////////////////////////////////////////////*/
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(address indexed owner, address indexed spender, uint256 amount);
/*//////////////////////////////////////////////////////////////
METADATA STORAGE
//////////////////////////////////////////////////////////////*/
string public name;
string public symbol;
uint8 public immutable decimals;
/*//////////////////////////////////////////////////////////////
ERC20 STORAGE
//////////////////////////////////////////////////////////////*/
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
/*//////////////////////////////////////////////////////////////
EIP-2612 STORAGE
//////////////////////////////////////////////////////////////*/
uint256 internal immutable INITIAL_CHAIN_ID;
bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;
mapping(address => uint256) public nonces;
/*//////////////////////////////////////////////////////////////
CONSTRUCTOR
//////////////////////////////////////////////////////////////*/
constructor(
string memory _name,
string memory _symbol,
uint8 _decimals
) {
name = _name;
symbol = _symbol;
decimals = _decimals;
INITIAL_CHAIN_ID = block.chainid;
INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
}
/*//////////////////////////////////////////////////////////////
ERC20 LOGIC
//////////////////////////////////////////////////////////////*/
function approve(address spender, uint256 amount) public virtual returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function transfer(address to, uint256 amount) public virtual returns (bool) {
balanceOf[msg.sender] -= amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(msg.sender, to, amount);
return true;
}
function transferFrom(
address from,
address to,
uint256 amount
) public virtual returns (bool) {
uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
balanceOf[from] -= amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(from, to, amount);
return true;
}
/*//////////////////////////////////////////////////////////////
EIP-2612 LOGIC
//////////////////////////////////////////////////////////////*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual {
require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");
// Unchecked because the only math done is incrementing
// the owner's nonce which cannot realistically overflow.
unchecked {
address recoveredAddress = ecrecover(
keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR(),
keccak256(
abi.encode(
keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
),
owner,
spender,
value,
nonces[owner]++,
deadline
)
)
)
),
v,
r,
s
);
require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");
allowance[recoveredAddress][spender] = value;
}
emit Approval(owner, spender, value);
}
function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
}
function computeDomainSeparator() internal view virtual returns (bytes32) {
return
keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256("1"),
block.chainid,
address(this)
)
);
}
/*//////////////////////////////////////////////////////////////
INTERNAL MINT/BURN LOGIC
//////////////////////////////////////////////////////////////*/
function _mint(address to, uint256 amount) internal virtual {
totalSupply += amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(address(0), to, amount);
}
function _burn(address from, uint256 amount) internal virtual {
balanceOf[from] -= amount;
// Cannot underflow because a user's balance
// will never be larger than the total supply.
unchecked {
totalSupply -= amount;
}
emit Transfer(from, address(0), amount);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 v4.6.0) (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
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;
interface IDiamondCut {
enum FacetCutAction {
Add,
Replace,
Remove
}
// Add=0, Replace=1, Remove=2
struct FacetCut {
address facetAddress;
FacetCutAction action;
bytes4[] functionSelectors;
}
/// @notice Add/replace/remove any number of functions and optionally execute
/// a function with delegatecall
/// @param _diamondCut Contains the facet addresses and function selectors
/// @param _init The address of the contract or facet to execute _calldata
/// @param _calldata A function call, including function selector and arguments
/// _calldata is executed with delegatecall on _init
function diamondCut(
FacetCut[] calldata _diamondCut,
address _init,
bytes calldata _calldata
) external;
event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}
// 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);
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
/// @title ERC-173 Contract Ownership Standard
/// Note: the ERC-165 identifier for this interface is 0x7f5828d0
/* is ERC165 */
interface IERC173 {
/// @dev This emits when ownership of a contract changes.
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/// @notice Get the address of the owner
/// @return owner_ The address of the owner.
function owner() external view returns (address owner_);
/// @notice Set the address of the new owner of the contract
/// @dev Set _newOwner to address(0) to renounce any ownership.
/// @param _newOwner The address of the new owner of the contract
function transferOwnership(address _newOwner) 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: 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 v4.8.0) (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 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);
}
}
}