Contract Name:
SmartWalletImplementation
Contract Source Code:
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "@kyber.network/utils-sc/contracts/IERC20Ext.sol";
import "./interfaces/ISmartWalletImplementation.sol";
import "./SmartWalletStorage.sol";
import "./swap/ISwap.sol";
import "./lending/ILending.sol";
contract SmartWalletImplementation is SmartWalletStorageV2, ISmartWalletImplementation {
using SafeERC20 for IERC20Ext;
using SafeMath for uint256;
using EnumerableSet for EnumerableSet.AddressSet;
event ApprovedAllowances(IERC20Ext[] tokens, address[] spenders, bool isReset);
event ClaimedPlatformFees(address[] wallets, IERC20Ext[] tokens, address claimer);
constructor(address _admin) SmartWalletStorage(_admin) {}
receive() external payable {}
/// Claim fee, must be done by platform address itself to avoid confusion
function claimPlatformFee(IERC20Ext[] calldata tokens)
external
override
nonReentrant
{
address platformWallet = msg.sender;
for (uint256 j = 0; j < tokens.length; j++) {
uint256 fee = platformWalletFees[platformWallet][tokens[j]];
if (fee > 1) {
// fee set to 1 to avoid the SSTORE initial gas cost
platformWalletFees[platformWallet][tokens[j]] = 1;
transferToken(payable(platformWallet), tokens[j], fee - 1);
}
}
address[] memory arr = new address[](1);
arr[0] = platformWallet;
emit ClaimedPlatformFees(arr, tokens, msg.sender);
}
/// Claim fee using admin right
function adminClaimPlatformFees(address[] calldata platformWallets, IERC20Ext[] calldata tokens)
external
override
nonReentrant
onlyAdmin
{
require(adminFeeCollector != address(0), "require admin fee collector");
for (uint256 i = 0; i < platformWallets.length; i++) {
for (uint256 j = 0; j < tokens.length; j++) {
uint256 fee = platformWalletFees[platformWallets[i]][tokens[j]];
if (fee > 1) {
// fee set to 1 to avoid the SSTORE initial gas cost
platformWalletFees[platformWallets[i]][tokens[j]] = 1;
transferToken(payable(adminFeeCollector), tokens[j], fee - 1);
}
}
}
emit ClaimedPlatformFees(platformWallets, tokens, msg.sender);
}
/// [Urgent] Claim fee using admin right, claim everything and set the fee to 0
function adminClaimPlatformFeesUrgent(address[] calldata platformWallets, IERC20Ext[] calldata tokens)
external
override
nonReentrant
onlyAdmin
{
require(adminFeeCollector != address(0), "require admin fee collector");
for (uint256 j = 0; j < tokens.length; j++) {
uint256 bal = getBalance(IERC20Ext(tokens[j]), address(this));
if (bal > 0) {
transferToken(payable(adminFeeCollector), tokens[j], bal);
for (uint256 i = 0; i < platformWallets.length; i++) {
platformWalletFees[platformWallets[i]][tokens[j]] = 0;
}
}
}
emit ClaimedPlatformFees(platformWallets, tokens, msg.sender);
}
function setAdminFeeCollector(address feeCollector) external override onlyAdmin {
adminFeeCollector = feeCollector;
}
/// @dev approve/unapprove LPs usage on the particular tokens
function approveAllowances(
IERC20Ext[] calldata tokens,
address[] calldata spenders,
bool isReset
) external onlyAdmin {
uint256 allowance = isReset ? 0 : MAX_ALLOWANCE;
for (uint256 i = 0; i < tokens.length; i++) {
for (uint256 j = 0; j < spenders.length; j++) {
tokens[i].safeApprove(spenders[j], allowance);
}
getSetDecimals(tokens[i]);
}
emit ApprovedAllowances(tokens, spenders, isReset);
}
/// @dev get expected return including the fee
/// @return destAmount expected dest amount
/// @return expectedRate expected swap rate
function getExpectedReturn(ISmartWalletImplementation.GetExpectedReturnParams calldata params)
external
view
override
returns (uint256 destAmount, uint256 expectedRate)
{
(destAmount, expectedRate,) = getExpectedReturnInternal(params, false);
}
function getExpectedReturnWithImpact(
ISmartWalletImplementation.GetExpectedReturnParams calldata params
)
external
view
override
returns (
uint256 destAmount,
uint256 expectedRate,
uint256 priceImpact
)
{
return getExpectedReturnInternal(params, true);
}
function getExpectedReturnInternal(
ISmartWalletImplementation.GetExpectedReturnParams memory params, bool withImpact
) private view returns (uint256 destAmount, uint256 expectedRate, uint256 priceImpact) {
if (params.feeBps >= BPS) return (0, 0, 0); // platform fee is too high
uint256 actualSrc = (params.feeMode == FeeMode.FROM_SOURCE)
? (params.srcAmount * (BPS - params.feeBps)) / BPS
: params.srcAmount;
if (withImpact) {
(destAmount, priceImpact) = ISwap(params.swapContract).getExpectedReturnWithImpact(
ISwap.GetExpectedReturnParams({
srcAmount: actualSrc,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
})
);
} else {
destAmount = ISwap(params.swapContract).getExpectedReturn(
ISwap.GetExpectedReturnParams({
srcAmount: actualSrc,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
})
);
}
if (params.feeMode == FeeMode.FROM_DEST) {
destAmount = (destAmount * (BPS - params.feeBps)) / BPS;
}
expectedRate = calcRateFromQty(
params.srcAmount,
destAmount,
getDecimals(IERC20Ext(params.tradePath[0])),
getDecimals(IERC20Ext(params.tradePath[params.tradePath.length - 1]))
);
}
/// @dev get expected in amount including the fee
/// @return srcAmount expected aource amount
/// @return expectedRate expected swap rate
function getExpectedIn(ISmartWalletImplementation.GetExpectedInParams calldata params)
external
view
override
returns (uint256 srcAmount, uint256 expectedRate)
{
(srcAmount, expectedRate, ) = getExpectedInInternal(params, false);
}
function getExpectedInWithImpact(ISmartWalletImplementation.GetExpectedInParams calldata params)
external
view
override
returns (uint256 srcAmount, uint256 expectedRate, uint256 priceImpact)
{
return getExpectedInInternal(params, true);
}
/// @dev get expected in amount including the fee
/// @return srcAmount expected aource amount
/// @return expectedRate expected swap rate
function getExpectedInInternal(ISmartWalletImplementation.GetExpectedInParams memory params, bool withImpact)
private
view
returns (uint256 srcAmount, uint256 expectedRate, uint256 priceImpact)
{
if (params.feeBps >= BPS) return (0, 0, 0); // platform fee is too high
uint256 actualDest = (params.feeMode == FeeMode.FROM_DEST)
? (params.destAmount * (BPS + params.feeBps)) / BPS
: params.destAmount;
if (withImpact) {
try
ISwap(params.swapContract).getExpectedInWithImpact(
ISwap.GetExpectedInParams({
destAmount: actualDest,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
})
)
returns (uint256 newSrcAmount, uint256 newPriceImpact) {
srcAmount = newSrcAmount;
priceImpact = newPriceImpact;
} catch Error(string memory reason) {
require(compareStrings(reason, "getExpectedIn_notSupported"), reason);
(srcAmount, priceImpact) = defaultGetExpectedIn(
params.swapContract,
ISwap.GetExpectedInParams({
destAmount: actualDest,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
}),
withImpact
);
}
} else {
try
ISwap(params.swapContract).getExpectedIn(
ISwap.GetExpectedInParams({
destAmount: actualDest,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
})
)
returns (uint256 newSrcAmount) {
srcAmount = newSrcAmount;
} catch Error(string memory reason) {
require(compareStrings(reason, "getExpectedReturnWithImpact_notSupported"), reason);
(srcAmount, priceImpact) = defaultGetExpectedIn(
params.swapContract,
ISwap.GetExpectedInParams({
destAmount: actualDest,
tradePath: params.tradePath,
feeBps: params.feeMode == FeeMode.BY_PROTOCOL ? params.feeBps : 0,
extraArgs: params.extraArgs
}),
withImpact
);
}
}
if (params.feeMode == FeeMode.FROM_SOURCE) {
srcAmount = (srcAmount * (BPS + params.feeBps)) / BPS;
}
expectedRate = calcRateFromQty(
srcAmount,
params.destAmount,
getDecimals(IERC20Ext(params.tradePath[0])),
getDecimals(IERC20Ext(params.tradePath[params.tradePath.length - 1]))
);
}
function defaultGetExpectedIn(address swapContract, ISwap.GetExpectedInParams memory params, bool withImpact)
private
view
returns (uint256 srcAmount, uint256 priceImpact)
{
uint8 srcDecimal = 18;
if (params.tradePath[0] != address(ETH_TOKEN_ADDRESS)) {
srcDecimal = IERC20Ext(params.tradePath[0]).decimals();
}
if (srcDecimal > 3) {
srcDecimal = srcDecimal - 3;
}
srcAmount = 1 * (10**srcDecimal); // Use a 0.001 as base
uint256 lastGoodSrcAmount = 0;
for (uint256 i = 0; i < 10; i++) {
try
ISwap(swapContract).getExpectedReturn(
ISwap.GetExpectedReturnParams({
srcAmount: srcAmount,
tradePath: params.tradePath,
feeBps: params.feeBps,
extraArgs: params.extraArgs
})
)
returns (uint256 newDestAmount) {
if (newDestAmount != 0) {
(lastGoodSrcAmount, srcAmount) = (
srcAmount,
(srcAmount * params.destAmount) / newDestAmount
);
continue;
}
} catch {}
// If there's an error or newDestAmount == 0, try something closer to lastGoodSrcAmount
srcAmount = (srcAmount + lastGoodSrcAmount) / 2;
}
// Precision check
uint256 destAmount;
if (withImpact) {
(destAmount, priceImpact) = ISwap(swapContract).getExpectedReturnWithImpact(
ISwap.GetExpectedReturnParams({
srcAmount: srcAmount,
tradePath: params.tradePath,
feeBps: params.feeBps,
extraArgs: params.extraArgs
})
);
} else {
destAmount = ISwap(swapContract).getExpectedReturn(
ISwap.GetExpectedReturnParams({
srcAmount: srcAmount,
tradePath: params.tradePath,
feeBps: params.feeBps,
extraArgs: params.extraArgs
})
);
}
uint256 diff;
if (destAmount > params.destAmount) {
diff = destAmount - params.destAmount;
} else {
diff = params.destAmount - destAmount;
}
}
/// @dev swap using particular swap contract
/// @return destAmount actual dest amount
function swap(ISmartWalletImplementation.SwapParams calldata params)
external
payable
override
nonReentrant
returns (uint256 destAmount)
{
destAmount = swapInternal(
params.swapContract,
params.srcAmount,
params.minDestAmount,
params.tradePath,
msg.sender,
params.feeMode,
params.feeBps,
params.platformWallet,
params.extraArgs
);
emit Swap(
msg.sender,
params.swapContract,
params.tradePath,
params.srcAmount,
destAmount,
params.feeMode,
params.feeBps,
params.platformWallet
);
}
/// @dev swap then deposit to platform
/// if tradePath has only 1 token, don't need to do swap
/// @return destAmount actual dest amount
function swapAndDeposit(ISmartWalletImplementation.SwapAndDepositParams calldata params)
external
payable
override
nonReentrant
returns (uint256 destAmount)
{
require(params.tradePath.length >= 1, "invalid tradePath");
require(supportedLendings.contains(params.lendingContract), "unsupported lending");
if (params.tradePath.length == 1) {
// just collect src token, no need to swap
validateSourceAmount(params.tradePath[0], params.srcAmount);
destAmount = safeTransferWithFee(
msg.sender,
params.lendingContract,
params.tradePath[0],
params.srcAmount,
// Not taking lending fee
0,
params.platformWallet
);
} else {
destAmount = swapInternal(
params.swapContract,
params.srcAmount,
params.minDestAmount,
params.tradePath,
params.lendingContract,
params.feeMode,
params.feeBps,
params.platformWallet,
params.extraArgs
);
}
// eth or token already transferred to the address
ILending(params.lendingContract).depositTo(
msg.sender,
IERC20Ext(params.tradePath[params.tradePath.length - 1]),
destAmount
);
emit SwapAndDeposit(
msg.sender,
params.swapContract,
params.lendingContract,
params.tradePath,
params.srcAmount,
destAmount,
params.feeMode,
params.feeBps,
params.platformWallet
);
}
/// @dev withdraw token from Lending platforms (AAVE, COMPOUND)
/// @return returnedAmount returns the amount withdrawn to the user
function withdrawFromLendingPlatform(
ISmartWalletImplementation.WithdrawFromLendingPlatformParams calldata params
) external override nonReentrant returns (uint256 returnedAmount) {
require(supportedLendings.contains(params.lendingContract), "unsupported lending");
IERC20Ext lendingToken = IERC20Ext(
ILending(params.lendingContract).getLendingToken(params.token)
);
require(lendingToken != IERC20Ext(0), "unsupported token");
// AAVE aToken's transfer logic could have rounding errors
uint256 tokenBalanceBefore = lendingToken.balanceOf(params.lendingContract);
lendingToken.safeTransferFrom(msg.sender, params.lendingContract, params.amount);
uint256 tokenBalanceAfter = lendingToken.balanceOf(params.lendingContract);
returnedAmount = ILending(params.lendingContract).withdrawFrom(
msg.sender,
params.token,
tokenBalanceAfter.sub(tokenBalanceBefore),
params.minReturn
);
require(returnedAmount >= params.minReturn, "low returned amount");
emit WithdrawFromLending(
msg.sender,
params.lendingContract,
params.token,
params.amount,
params.minReturn,
returnedAmount
);
}
/// @dev swap and repay borrow for sender
function swapAndRepay(ISmartWalletImplementation.SwapAndRepayParams calldata params)
external
payable
override
nonReentrant
returns (uint256 destAmount)
{
require(params.tradePath.length >= 1, "invalid tradePath");
require(supportedLendings.contains(params.lendingContract), "unsupported lending");
// use user debt value if debt is <= payAmount
// user can pay all debt by putting really high payAmount as param
uint256 debt = ILending(params.lendingContract).getUserDebtCurrent(
params.tradePath[params.tradePath.length - 1],
msg.sender
);
uint256 actualPayAmount = debt >= params.payAmount ? params.payAmount : debt;
if (params.tradePath.length == 1) {
// just collect src token, no need to swap
validateSourceAmount(params.tradePath[0], params.srcAmount);
destAmount = safeTransferWithFee(
msg.sender,
params.lendingContract,
params.tradePath[0],
params.srcAmount,
// Not taking repay fee
0,
params.platformWallet
);
} else {
destAmount = swapInternal(
params.swapContract,
params.srcAmount,
actualPayAmount,
params.tradePath,
params.lendingContract,
params.feeMode,
params.feeBps,
params.platformWallet,
params.extraArgs
);
}
ILending(params.lendingContract).repayBorrowTo(
msg.sender,
IERC20Ext(params.tradePath[params.tradePath.length - 1]),
destAmount,
actualPayAmount,
abi.encodePacked(params.rateMode)
);
uint256 actualDebtPaid = debt.sub(
ILending(params.lendingContract).getUserDebtCurrent(
params.tradePath[params.tradePath.length - 1],
msg.sender
)
);
require(actualDebtPaid >= actualPayAmount, "low paid amount");
emit SwapAndRepay(
msg.sender,
params.swapContract,
params.lendingContract,
params.tradePath,
params.srcAmount,
destAmount,
actualPayAmount,
params.feeMode,
params.feeBps,
params.platformWallet
);
}
function swapInternal(
address payable swapContract,
uint256 srcAmount,
uint256 minDestAmount,
address[] calldata tradePath,
address payable recipient,
FeeMode feeMode,
uint256 platformFee,
address payable platformWallet,
bytes calldata extraArgs
) internal returns (uint256 destAmount) {
require(supportedSwaps.contains(swapContract), "unsupported swap");
require(tradePath.length >= 2, "invalid tradePath");
require(platformFee < BPS, "high platform fee");
validateSourceAmount(tradePath[0], srcAmount);
uint256 actualSrcAmount = safeTransferWithFee(
msg.sender,
swapContract,
tradePath[0],
srcAmount,
feeMode == FeeMode.FROM_SOURCE ? platformFee : 0,
platformWallet
);
{
// to avoid stack too deep
// who will receive the swapped token
// address _recipient = feeMode == FeeMode.FROM_DEST ? address(this) : recipient;
uint256 delta = getBalance(IERC20Ext(tradePath[tradePath.length - 1]), feeMode == FeeMode.FROM_DEST ? address(this) : recipient);
destAmount = ISwap(swapContract).swap(
ISwap.SwapParams({
srcAmount: actualSrcAmount,
minDestAmount: minDestAmount,
tradePath: tradePath,
recipient: feeMode == FeeMode.FROM_DEST ? address(this) : recipient,
feeBps: feeMode == FeeMode.BY_PROTOCOL ? platformFee : 0,
feeReceiver: platformWallet,
extraArgs: extraArgs
})
);
delta = getBalance(IERC20Ext(tradePath[tradePath.length - 1]), feeMode == FeeMode.FROM_DEST ? address(this) : recipient) - delta;
require(delta >= destAmount, "return amount not enough");
}
if (feeMode == FeeMode.FROM_DEST) {
destAmount = safeTransferWithFee(
address(this),
recipient,
tradePath[tradePath.length - 1],
destAmount,
platformFee,
platformWallet
);
}
require(destAmount >= minDestAmount, "low return");
}
function validateSourceAmount(address srcToken, uint256 srcAmount) internal {
if (srcToken == address(ETH_TOKEN_ADDRESS)) {
require(msg.value == srcAmount, "wrong msg value");
} else {
require(msg.value == 0, "bad msg value");
}
}
function transferToken(
address payable to,
IERC20Ext token,
uint256 amount
) internal {
if (amount == 0) return;
if (token == ETH_TOKEN_ADDRESS) {
(bool success, ) = to.call{value: amount}("");
require(success, "transfer failed");
} else {
token.safeTransfer(to, amount);
}
}
function safeTransferWithFee(
address payable from,
address payable to,
address token,
uint256 amount,
uint256 platformFeeBps,
address payable platformWallet
) internal returns (uint256 amountTransferred) {
uint256 fee = amount.mul(platformFeeBps).div(BPS);
uint256 amountAfterFee = amount.sub(fee);
IERC20Ext tokenErc = IERC20Ext(token);
if (tokenErc == ETH_TOKEN_ADDRESS) {
(bool success, ) = to.call{value: amountAfterFee}("");
require(success, "transfer failed");
amountTransferred = amountAfterFee;
} else {
uint256 balanceBefore = tokenErc.balanceOf(to);
if (from != address(this)) {
// case transfer from another address, need to transfer fee to this proxy contract
tokenErc.safeTransferFrom(from, to, amountAfterFee);
if (fee > 0) {
tokenErc.safeTransferFrom(from, address(this), fee);
}
} else {
tokenErc.safeTransfer(to, amountAfterFee);
}
amountTransferred = tokenErc.balanceOf(to).sub(balanceBefore);
}
addFeeToPlatform(platformWallet, tokenErc, fee);
}
function addFeeToPlatform(
address payable platformWallet,
IERC20Ext token,
uint256 amount
) internal {
if (amount > 0) {
require(supportedPlatformWallets.contains(platformWallet), "unsupported platform");
platformWalletFees[platformWallet][token] = platformWalletFees[platformWallet][token]
.add(amount);
}
}
function compareStrings(string memory a, string memory b) private pure returns (bool) {
return (keccak256(abi.encodePacked((a))) == keccak256(abi.encodePacked((b))));
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
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'
// solhint-disable-next-line max-line-length
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).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @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
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping (bytes32 => uint256) _indexes;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._indexes[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We read and store the value's index to prevent multiple reads from the same storage slot
uint256 valueIndex = set._indexes[value];
if (valueIndex != 0) { // Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = valueIndex - 1;
uint256 lastIndex = set._values.length - 1;
// When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
bytes32 lastvalue = set._values[lastIndex];
// Move the last value to the index where the value to delete is
set._values[toDeleteIndex] = lastvalue;
// Update the index for the moved value
set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the index for the deleted slot
delete set._indexes[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
require(set._values.length > index, "EnumerableSet: index out of bounds");
return set._values[index];
}
// Bytes32Set
struct Bytes32Set {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _add(set._inner, value);
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _remove(set._inner, value);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
return _contains(set._inner, value);
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(Bytes32Set storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
return _at(set._inner, index);
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint160(uint256(_at(set._inner, index))));
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/**
* @dev Interface extending ERC20 standard to include decimals() as
* it is optional in the OpenZeppelin IERC20 interface.
*/
interface IERC20Ext is IERC20 {
/**
* @dev This function is required as Kyber requires to interact
* with token.decimals() with many of its operations.
*/
function decimals() external view returns (uint8 digits);
}
pragma solidity 0.7.6;
pragma abicoder v2;
import "@kyber.network/utils-sc/contracts/IERC20Ext.sol";
interface ISmartWalletImplementation {
enum FeeMode {
FROM_SOURCE,
FROM_DEST,
BY_PROTOCOL
}
event Swap(
address indexed trader,
address indexed swapContract,
address[] tradePath,
uint256 srcAmount,
uint256 destAmount,
FeeMode feeMode,
uint256 feeBps,
address platformWallet
);
event SwapAndDeposit(
address indexed trader,
address indexed swapContract,
address indexed lendingContract,
address[] tradePath,
uint256 srcAmount,
uint256 destAmount,
FeeMode feeMode,
uint256 feeBps,
address platformWallet
);
event WithdrawFromLending(
address indexed trader,
address indexed lendingContract,
IERC20Ext token,
uint256 amount,
uint256 minReturn,
uint256 actualReturnAmount
);
event SwapAndRepay(
address indexed trader,
address indexed swapContract,
address indexed lendingContract,
address[] tradePath,
uint256 srcAmount,
uint256 destAmount,
uint256 payAmount,
FeeMode feeMode,
uint256 feeBps,
address platformWallet
);
/// @param swapContract swap contract
/// @param srcAmount amount of src token
/// @param tradePath path of the trade on Uniswap
/// @param platformFee fee if swapping feeMode = platformFee / BPS, feeBps = platformFee % BPS
/// @param extraArgs extra data needed for swap on particular platforms
struct GetExpectedReturnParams {
address payable swapContract;
uint256 srcAmount;
address[] tradePath;
FeeMode feeMode;
uint256 feeBps;
bytes extraArgs;
}
function getExpectedReturn(GetExpectedReturnParams calldata params)
external
view
returns (uint256 destAmount, uint256 expectedRate);
function getExpectedReturnWithImpact(GetExpectedReturnParams calldata params)
external
view
returns (
uint256 destAmount,
uint256 expectedRate,
uint256 priceImpact
); // in BPS
struct GetExpectedInParams {
address payable swapContract;
uint256 destAmount;
address[] tradePath;
FeeMode feeMode;
uint256 feeBps;
bytes extraArgs;
}
function getExpectedIn(GetExpectedInParams calldata params)
external
view
returns (uint256 srcAmount, uint256 expectedRate);
function getExpectedInWithImpact(GetExpectedInParams calldata params)
external
view
returns (
uint256 srcAmount,
uint256 expectedRate,
uint256 priceImpact
);
/// @param swapContract swap contract
/// @param srcAmount amount of src token
/// @param minDestAmount minimal accepted dest amount
/// @param tradePath path of the trade on Uniswap
/// @param feeMode fee mode
/// @param feeBps fee bps
/// @param platformWallet wallet to receive fee
/// @param extraArgs extra data needed for swap on particular platforms
struct SwapParams {
address payable swapContract;
uint256 srcAmount;
uint256 minDestAmount;
address[] tradePath;
FeeMode feeMode;
uint256 feeBps;
address payable platformWallet;
bytes extraArgs;
}
function swap(SwapParams calldata params) external payable returns (uint256 destAmount);
/// @param swapContract swap contract
/// @param lendingContract lending contract
/// @param srcAmount amount of src token
/// @param minDestAmount minimal accepted dest amount
/// @param tradePath path of the trade on Uniswap
/// @param feeMode fee mode
/// @param feeBps fee bps
/// @param platformWallet wallet to receive fee
/// @param extraArgs extra data needed for swap on particular platforms
struct SwapAndDepositParams {
address payable swapContract;
address payable lendingContract;
uint256 srcAmount;
uint256 minDestAmount;
address[] tradePath;
FeeMode feeMode;
uint256 feeBps;
address payable platformWallet;
bytes extraArgs;
}
function swapAndDeposit(SwapAndDepositParams calldata params)
external
payable
returns (uint256 destAmount);
/// @param lendingContract lending contract to withdraw token
/// @param token underlying token to withdraw, e.g ETH, USDT, DAI
/// @param amount amount of cToken (COMPOUND) or aToken (AAVE) to withdraw
/// @param minReturn minimum amount of underlying tokens to return
struct WithdrawFromLendingPlatformParams {
address payable lendingContract;
IERC20Ext token;
uint256 amount;
uint256 minReturn;
}
function withdrawFromLendingPlatform(WithdrawFromLendingPlatformParams calldata params)
external
returns (uint256 returnedAmount);
/// @param swapContract swap contract
/// @param lendingContract lending contract
/// @param srcAmount amount of src token
/// @param payAmount: amount that user wants to pay, if the dest amount (after swap) is higher,
/// the remain amount will be sent back to user's wallet
/// @param tradePath path of the trade on Uniswap
/// @param rateMode rate mode for aave v2
/// @param feeMode fee mode
/// @param feeBps fee bps
/// @param platformWallet wallet to receive fee
/// @param extraArgs extra data needed for swap on particular platforms
struct SwapAndRepayParams {
address payable swapContract;
address payable lendingContract;
uint256 srcAmount;
uint256 payAmount;
address[] tradePath;
uint256 rateMode; // for aave v2
FeeMode feeMode;
uint256 feeBps;
address payable platformWallet;
bytes extraArgs;
}
function swapAndRepay(SwapAndRepayParams calldata params)
external
payable
returns (uint256 destAmount);
function claimPlatformFee(IERC20Ext[] calldata tokens) external;
function adminClaimPlatformFees(
address[] calldata platformWallets,
IERC20Ext[] calldata tokens
) external;
function adminClaimPlatformFeesUrgent(
address[] calldata platformWallets,
IERC20Ext[] calldata tokens
) external;
function setAdminFeeCollector(address feeCollector) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "@kyber.network/utils-sc/contracts/IERC20Ext.sol";
import "@kyber.network/utils-sc/contracts/Utils.sol";
import "@kyber.network/utils-sc/contracts/Withdrawable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
contract SmartWalletStorage is Utils, Withdrawable, ReentrancyGuard {
uint256 internal constant MAX_AMOUNT = type(uint256).max;
mapping(address => mapping(IERC20Ext => uint256)) public platformWalletFees;
EnumerableSet.AddressSet internal supportedPlatformWallets;
EnumerableSet.AddressSet internal supportedSwaps;
EnumerableSet.AddressSet internal supportedLendings;
// [EIP-1967] bytes32(uint256(keccak256("SmartWalletImplementation")) - 1)
bytes32 internal constant IMPLEMENTATION =
0x7cf58d76330f82325c2a503c72b55abca3eb533fadde43d95e3c0cceb1583e99;
constructor(address _admin) Withdrawable(_admin) {}
}
abstract contract SmartWalletStorageV2 is SmartWalletStorage {
address public adminFeeCollector;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
interface ISwap {
struct GetExpectedReturnParams {
uint256 srcAmount;
address[] tradePath;
uint256 feeBps;
bytes extraArgs;
}
function getExpectedReturn(GetExpectedReturnParams calldata params)
external
view
returns (uint256 destAmount);
function getExpectedReturnWithImpact(GetExpectedReturnParams calldata params)
external
view
returns (uint256 destAmount, uint256 priceImpact);
struct GetExpectedInParams {
uint256 destAmount;
address[] tradePath;
uint256 feeBps;
bytes extraArgs;
}
function getExpectedIn(GetExpectedInParams calldata params)
external
view
returns (uint256 srcAmount);
function getExpectedInWithImpact(GetExpectedInParams calldata params)
external
view
returns (uint256 srcAmount, uint256 priceImpact);
struct SwapParams {
uint256 srcAmount;
uint256 minDestAmount;
address[] tradePath;
address recipient;
uint256 feeBps;
address payable feeReceiver;
bytes extraArgs;
}
function swap(SwapParams calldata params) external payable returns (uint256 destAmount);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;
import "@kyber.network/utils-sc/contracts/IERC20Ext.sol";
interface ILending {
function depositTo(
address payable onBehalfOf,
IERC20Ext token,
uint256 amount
) external;
function withdrawFrom(
address payable onBehalfOf,
IERC20Ext token,
uint256 amount,
uint256 minReturn
) external returns (uint256 returnedAmount);
function repayBorrowTo(
address payable onBehalfOf,
IERC20Ext token,
uint256 amount,
uint256 payAmount,
bytes calldata extraArgs // for extra data .i.e aave rateMode
) external;
function getUserDebtCurrent(address _reserve, address _user) external returns (uint256 debt);
function getLendingToken(IERC20Ext token) external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
/**
* @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);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a % b;
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;
/**
* @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
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 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");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "./IERC20Ext.sol";
/**
* @title Kyber utility file
* mostly shared constants and rate calculation helpers
* inherited by most of kyber contracts.
* previous utils implementations are for previous solidity versions.
*/
abstract contract Utils {
// Declared constants below to be used in tandem with
// getDecimalsConstant(), for gas optimization purposes
// which return decimals from a constant list of popular
// tokens.
IERC20Ext internal constant ETH_TOKEN_ADDRESS = IERC20Ext(
0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
);
IERC20Ext internal constant USDT_TOKEN_ADDRESS = IERC20Ext(
0xdAC17F958D2ee523a2206206994597C13D831ec7
);
IERC20Ext internal constant DAI_TOKEN_ADDRESS = IERC20Ext(
0x6B175474E89094C44Da98b954EedeAC495271d0F
);
IERC20Ext internal constant USDC_TOKEN_ADDRESS = IERC20Ext(
0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
);
IERC20Ext internal constant WBTC_TOKEN_ADDRESS = IERC20Ext(
0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599
);
IERC20Ext internal constant KNC_TOKEN_ADDRESS = IERC20Ext(
0xdd974D5C2e2928deA5F71b9825b8b646686BD200
);
uint256 public constant BPS = 10000; // Basic Price Steps. 1 step = 0.01%
uint256 internal constant PRECISION = (10**18);
uint256 internal constant MAX_QTY = (10**28); // 10B tokens
uint256 internal constant MAX_RATE = (PRECISION * 10**7); // up to 10M tokens per eth
uint256 internal constant MAX_DECIMALS = 18;
uint256 internal constant ETH_DECIMALS = 18;
uint256 internal constant MAX_ALLOWANCE = uint256(-1); // token.approve inifinite
mapping(IERC20Ext => uint256) internal decimals;
/// @dev Sets the decimals of a token to storage if not already set, and returns
/// the decimals value of the token. Prefer using this function over
/// getDecimals(), to avoid forgetting to set decimals in local storage.
/// @param token The token type
/// @return tokenDecimals The decimals of the token
function getSetDecimals(IERC20Ext token) internal returns (uint256 tokenDecimals) {
tokenDecimals = getDecimalsConstant(token);
if (tokenDecimals > 0) return tokenDecimals;
tokenDecimals = decimals[token];
if (tokenDecimals == 0) {
tokenDecimals = token.decimals();
decimals[token] = tokenDecimals;
}
}
/// @dev Get the balance of a user
/// @param token The token type
/// @param user The user's address
/// @return The balance
function getBalance(IERC20Ext token, address user) internal view returns (uint256) {
if (token == ETH_TOKEN_ADDRESS) {
return user.balance;
} else {
return token.balanceOf(user);
}
}
/// @dev Get the decimals of a token, read from the constant list, storage,
/// or from token.decimals(). Prefer using getSetDecimals when possible.
/// @param token The token type
/// @return tokenDecimals The decimals of the token
function getDecimals(IERC20Ext token) internal view returns (uint256 tokenDecimals) {
// return token decimals if has constant value
tokenDecimals = getDecimalsConstant(token);
if (tokenDecimals > 0) return tokenDecimals;
// handle case where token decimals is not a declared decimal constant
tokenDecimals = decimals[token];
// moreover, very possible that old tokens have decimals 0
// these tokens will just have higher gas fees.
return (tokenDecimals > 0) ? tokenDecimals : token.decimals();
}
function calcDestAmount(
IERC20Ext src,
IERC20Ext dest,
uint256 srcAmount,
uint256 rate
) internal view returns (uint256) {
return calcDstQty(srcAmount, getDecimals(src), getDecimals(dest), rate);
}
function calcSrcAmount(
IERC20Ext src,
IERC20Ext dest,
uint256 destAmount,
uint256 rate
) internal view returns (uint256) {
return calcSrcQty(destAmount, getDecimals(src), getDecimals(dest), rate);
}
function calcDstQty(
uint256 srcQty,
uint256 srcDecimals,
uint256 dstDecimals,
uint256 rate
) internal pure returns (uint256) {
require(srcQty <= MAX_QTY, "srcQty > MAX_QTY");
require(rate <= MAX_RATE, "rate > MAX_RATE");
if (dstDecimals >= srcDecimals) {
require((dstDecimals - srcDecimals) <= MAX_DECIMALS, "dst - src > MAX_DECIMALS");
return (srcQty * rate * (10**(dstDecimals - srcDecimals))) / PRECISION;
} else {
require((srcDecimals - dstDecimals) <= MAX_DECIMALS, "src - dst > MAX_DECIMALS");
return (srcQty * rate) / (PRECISION * (10**(srcDecimals - dstDecimals)));
}
}
function calcSrcQty(
uint256 dstQty,
uint256 srcDecimals,
uint256 dstDecimals,
uint256 rate
) internal pure returns (uint256) {
require(dstQty <= MAX_QTY, "dstQty > MAX_QTY");
require(rate <= MAX_RATE, "rate > MAX_RATE");
//source quantity is rounded up. to avoid dest quantity being too low.
uint256 numerator;
uint256 denominator;
if (srcDecimals >= dstDecimals) {
require((srcDecimals - dstDecimals) <= MAX_DECIMALS, "src - dst > MAX_DECIMALS");
numerator = (PRECISION * dstQty * (10**(srcDecimals - dstDecimals)));
denominator = rate;
} else {
require((dstDecimals - srcDecimals) <= MAX_DECIMALS, "dst - src > MAX_DECIMALS");
numerator = (PRECISION * dstQty);
denominator = (rate * (10**(dstDecimals - srcDecimals)));
}
return (numerator + denominator - 1) / denominator; //avoid rounding down errors
}
function calcRateFromQty(
uint256 srcAmount,
uint256 destAmount,
uint256 srcDecimals,
uint256 dstDecimals
) internal pure returns (uint256) {
require(srcAmount <= MAX_QTY, "srcAmount > MAX_QTY");
require(destAmount <= MAX_QTY, "destAmount > MAX_QTY");
if (dstDecimals >= srcDecimals) {
require((dstDecimals - srcDecimals) <= MAX_DECIMALS, "dst - src > MAX_DECIMALS");
return ((destAmount * PRECISION) / ((10**(dstDecimals - srcDecimals)) * srcAmount));
} else {
require((srcDecimals - dstDecimals) <= MAX_DECIMALS, "src - dst > MAX_DECIMALS");
return ((destAmount * PRECISION * (10**(srcDecimals - dstDecimals))) / srcAmount);
}
}
/// @dev save storage access by declaring token decimal constants
/// @param token The token type
/// @return token decimals
function getDecimalsConstant(IERC20Ext token) internal pure returns (uint256) {
if (token == ETH_TOKEN_ADDRESS) {
return ETH_DECIMALS;
} else if (token == USDT_TOKEN_ADDRESS) {
return 6;
} else if (token == DAI_TOKEN_ADDRESS) {
return 18;
} else if (token == USDC_TOKEN_ADDRESS) {
return 6;
} else if (token == WBTC_TOKEN_ADDRESS) {
return 8;
} else if (token == KNC_TOKEN_ADDRESS) {
return 18;
} else {
return 0;
}
}
function minOf(uint256 x, uint256 y) internal pure returns (uint256) {
return x > y ? y : x;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "./IERC20Ext.sol";
import "./PermissionAdmin.sol";
abstract contract Withdrawable is PermissionAdmin {
using SafeERC20 for IERC20Ext;
event TokenWithdraw(IERC20Ext token, uint256 amount, address sendTo);
event EtherWithdraw(uint256 amount, address sendTo);
constructor(address _admin) PermissionAdmin(_admin) {}
/**
* @dev Withdraw all IERC20Ext compatible tokens
* @param token IERC20Ext The address of the token contract
*/
function withdrawToken(
IERC20Ext token,
uint256 amount,
address sendTo
) external onlyAdmin {
token.safeTransfer(sendTo, amount);
emit TokenWithdraw(token, amount, sendTo);
}
/**
* @dev Withdraw Ethers
*/
function withdrawEther(uint256 amount, address payable sendTo) external onlyAdmin {
(bool success, ) = sendTo.call{value: amount}("");
require(success, "withdraw failed");
emit EtherWithdraw(amount, sendTo);
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
abstract contract PermissionAdmin {
address public admin;
address public pendingAdmin;
event AdminClaimed(address newAdmin, address previousAdmin);
event TransferAdminPending(address pendingAdmin);
constructor(address _admin) {
require(_admin != address(0), "admin 0");
admin = _admin;
}
modifier onlyAdmin() {
require(msg.sender == admin, "only admin");
_;
}
/**
* @dev Allows the current admin to set the pendingAdmin address.
* @param newAdmin The address to transfer ownership to.
*/
function transferAdmin(address newAdmin) public onlyAdmin {
require(newAdmin != address(0), "new admin 0");
emit TransferAdminPending(newAdmin);
pendingAdmin = newAdmin;
}
/**
* @dev Allows the current admin to set the admin in one tx. Useful initial deployment.
* @param newAdmin The address to transfer ownership to.
*/
function transferAdminQuickly(address newAdmin) public onlyAdmin {
require(newAdmin != address(0), "admin 0");
emit TransferAdminPending(newAdmin);
emit AdminClaimed(newAdmin, admin);
admin = newAdmin;
}
/**
* @dev Allows the pendingAdmin address to finalize the change admin process.
*/
function claimAdmin() public {
require(pendingAdmin == msg.sender, "not pending");
emit AdminClaimed(pendingAdmin, admin);
admin = pendingAdmin;
pendingAdmin = address(0);
}
}