Contract Source Code:
File 1 of 1 : zapper
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
// Part: IHyperswapRouter01
interface IHyperswapRouter01 {
function factory() external pure returns (address);
function WFTM() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityFTM(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountFTMMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountFTM, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityFTM(
address token,
uint liquidity,
uint amountTokenMin,
uint amountFTMMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountFTM);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityFTMWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountFTMMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountFTM);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactFTMForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactFTM(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForFTM(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapFTMForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
// Part: IUniswapV2Pair
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
// Part: IUniswapV2Router01
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
// Part: OpenZeppelin/[email protected]/IERC20
/**
* @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);
}
// Part: IVault
interface IVault is IERC20 {
function deposit(uint256 amount) external;
function withdraw(uint256 shares) external;
function want() external pure returns (address);
}
// Part: OpenZeppelin/[email protected]/Address
/**
* @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);
}
}
}
}
// Part: OpenZeppelin/[email protected]/SafeMath
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
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) {
unchecked {
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) {
unchecked {
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) {
unchecked {
// 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) {
unchecked {
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) {
unchecked {
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) {
return a + b;
}
/**
* @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) {
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) {
return a * b;
}
/**
* @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.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
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) {
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) {
unchecked {
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.
*
* 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).
*
* 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) {
unchecked {
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) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// Part: TransferHelper
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
function safeApprove(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
}
function safeTransfer(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
}
function safeTransferFrom(address token, address from, address to, uint value) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
}
function safeTransferETH(address to, uint value) internal {
(bool success,) = to.call{value:value}(new bytes(0));
require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
}
}
// Part: OpenZeppelin/[email protected]/SafeERC20
/**
* @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'
// 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) + 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));
}
}
/**
* @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");
}
}
}
// File: Context.sol
pragma solidity ^0.8.7;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: Ownable.sol
pragma solidity ^0.8.7;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File: IZap.sol
interface IZap {
function estimateZapInToken(address _from, address _to, address _router, uint _amt) external view returns (uint256, uint256);
function swapToken(address _from, uint amount, address _to, address routerAddr, address _recipient) external;
function swapToNative(address _from, uint amount, address routerAddr, address _recipient) external;
function zapIn(address _to, address routerAddr, address _recipient) external payable;
function zapInToken(address _from, uint amount, address _to, address routerAddr, address _recipient) external;
function zapAcross(address _from, uint amount, address _toRouter, address _recipient) external;
function zapOut(address _from, uint amount, address routerAddr, address _recipient) external;
function zapOutToken(address _from, uint amount, address _to, address routerAddr, address _recipient) external;
}
// File: zapper.sol
contract zapper is Ownable, IZap {
using SafeMath for uint;
using SafeERC20 for IERC20;
/* ========== STATE VARIABLES ========== */
address private WNATIVE;
address public validRouter;
mapping(address => mapping(address => address)) private tokenBridgeForRouter;
mapping(address => bool) public isFeeOnTransfer;
mapping (address => bool) public useNativeRouter;
constructor(address _WNATIVE) Ownable() {
WNATIVE = _WNATIVE;
}
modifier authRouter(address _authRouter) {
require(_authRouter == validRouter, "invalid router");
_;
}
/* ========== External Functions ========== */
receive() external payable {}
function zapInToken(address _from, uint amount, address _to, address routerAddr, address _recipient) authRouter(routerAddr) external override {
_approveTokenIfNeeded(_from, routerAddr);
if (isFeeOnTransfer[_from]) {
IERC20(_from).transferFrom(msg.sender, address(this), amount);
_swapTokenToLP(_from, IERC20(_from).balanceOf(address(this)), _to, _recipient, routerAddr);
return;
} else {
// From an ERC20 to an LP token, through specified router, going through base asset if necessary
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
// we'll need this approval to add liquidity
_approveTokenIfNeeded(_from, routerAddr);
_swapTokenToLP(_from, amount, _to, _recipient, routerAddr);
return;
}
}
function estimateZapInToken(address _from, address _to, address _router, uint _amt) authRouter(_router) public view override returns (uint256, uint256) {
// get pairs for desired lp
if (_from == IUniswapV2Pair(_to).token0() || _from == IUniswapV2Pair(_to).token1()) { // check if we already have one of the assets
// if so, we're going to sell half of _from for the other token we need
// figure out which token we need, and approve
address other = _from == IUniswapV2Pair(_to).token0() ? IUniswapV2Pair(_to).token1() : IUniswapV2Pair(_to).token0();
// calculate amount of _from to sell
uint sellAmount = _amt.div(2);
// execute swap
uint otherAmount = _estimateSwap(_from, sellAmount, other, _router);
if (_from == IUniswapV2Pair(_to).token0()) {
return (sellAmount, otherAmount);
} else {
return (otherAmount, sellAmount);
}
} else {
// go through native token for highest liquidity
uint nativeAmount = _from == WNATIVE ? _amt : _estimateSwap(_from, _amt, WNATIVE, _router);
if (WNATIVE == IUniswapV2Pair(_to).token0()) {
return (nativeAmount.div(2), _estimateSwap(WNATIVE, nativeAmount.div(2), IUniswapV2Pair(_to).token1(), _router ));
}
if (WNATIVE == IUniswapV2Pair(_to).token1()) {
return (_estimateSwap(WNATIVE, nativeAmount.div(2), IUniswapV2Pair(_to).token0(), _router ), nativeAmount.div(2));
}
return (_estimateSwap(WNATIVE, nativeAmount.div(2), IUniswapV2Pair(_to).token0(), _router ), _estimateSwap(WNATIVE, nativeAmount.div(2), IUniswapV2Pair(_to).token1(), _router));
}
}
function zapIn(address _to, address routerAddr, address _recipient) authRouter(routerAddr) external payable override {
// from Native to an LP token through the specified router
_swapNativeToLP(_to, msg.value, _recipient, routerAddr);
if (address(this).balance != 0) {
TransferHelper.safeTransferETH(msg.sender, address(this).balance);
}
}
function zapAcross(address _from, uint amount, address _toRouter, address _recipient) authRouter(_toRouter) external override {
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
IUniswapV2Pair pair = IUniswapV2Pair(_from);
_approveTokenIfNeeded(pair.token0(), _toRouter);
_approveTokenIfNeeded(pair.token1(), _toRouter);
IERC20(_from).safeTransfer(_from, amount);
uint amt0;
uint amt1;
(amt0, amt1) = pair.burn(address(this));
IUniswapV2Router01(_toRouter).addLiquidity(pair.token0(), pair.token1(), amt0, amt1, 0, 0, _recipient, block.timestamp);
}
function zapOut(address _from, uint amount, address routerAddr, address _recipient) authRouter(routerAddr) external override {
// from an LP token to Native through specified router
// take the LP token
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
_approveTokenIfNeeded(_from, routerAddr);
// get pairs for LP
address token0 = IUniswapV2Pair(_from).token0();
address token1 = IUniswapV2Pair(_from).token1();
_approveTokenIfNeeded(token0, routerAddr);
_approveTokenIfNeeded(token1, routerAddr);
// check if either is already native token
if (token0 == WNATIVE || token1 == WNATIVE) {
// if so, we only need to swap one, figure out which and how much
address token = token0 != WNATIVE ? token0 : token1;
uint amtToken;
uint amtETH;
(amtToken, amtETH) = IUniswapV2Router01(routerAddr).removeLiquidityETH(token, amount, 0, 0, address(this), block.timestamp);
// swap with msg.sender as recipient, so they already get the Native
_swapTokenForNative(token, amtToken, _recipient, routerAddr);
// send other half of Native
TransferHelper.safeTransferETH(_recipient, amtETH);
} else {
// convert both for Native with msg.sender as recipient
uint amt0;
uint amt1;
(amt0, amt1) = IUniswapV2Router01(routerAddr).removeLiquidity(token0, token1, amount, 0, 0, address(this), block.timestamp);
_swapTokenForNative(token0, amt0, _recipient, routerAddr);
_swapTokenForNative(token1, amt1, _recipient, routerAddr);
}
}
function zapOutToken(address _from, uint amount, address _to, address routerAddr, address _recipient) authRouter(routerAddr) external override {
// from an LP token to an ERC20 through specified router
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
_approveTokenIfNeeded(_from, routerAddr);
address token0 = IUniswapV2Pair(_from).token0();
address token1 = IUniswapV2Pair(_from).token1();
_approveTokenIfNeeded(token0, routerAddr);
_approveTokenIfNeeded(token1, routerAddr);
uint amt0;
uint amt1;
(amt0, amt1) = IUniswapV2Router01(routerAddr).removeLiquidity(token0, token1, amount, 0, 0, address(this), block.timestamp);
if (token0 != _to) {
amt0 = _swap(token0, amt0, _to, address(this), routerAddr);
}
if (token1 != _to) {
amt1 = _swap(token1, amt1, _to, address(this), routerAddr);
}
IERC20(_to).safeTransfer(_recipient, amt0.add(amt1));
}
function swapToken(address _from, uint amount, address _to, address routerAddr, address _recipient) authRouter(routerAddr) external override {
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
_approveTokenIfNeeded(_from, routerAddr);
_swap(_from, amount, _to, _recipient, routerAddr);
}
function swapToNative(address _from, uint amount, address routerAddr, address _recipient) authRouter(routerAddr) external override {
IERC20(_from).safeTransferFrom(msg.sender, address(this), amount);
_approveTokenIfNeeded(_from, routerAddr);
_swapTokenForNative(_from, amount, _recipient, routerAddr);
}
/* ========== Private Functions ========== */
function _approveTokenIfNeeded(address token, address router) private {
if (IERC20(token).allowance(address(this), router) == 0) {
IERC20(token).safeApprove(router, type(uint).max);
}
}
function _swapTokenToLP(address _from, uint amount, address _to, address recipient, address routerAddr) private returns (uint) {
// get pairs for desired lp
if (_from == IUniswapV2Pair(_to).token0() || _from == IUniswapV2Pair(_to).token1()) { // check if we already have one of the assets
// if so, we're going to sell half of _from for the other token we need
// figure out which token we need, and approve
address other = _from == IUniswapV2Pair(_to).token0() ? IUniswapV2Pair(_to).token1() : IUniswapV2Pair(_to).token0();
_approveTokenIfNeeded(other, routerAddr);
// calculate amount of _from to sell
uint sellAmount = amount.div(2);
// execute swap
uint otherAmount = _swap(_from, sellAmount, other, address(this), routerAddr);
uint liquidity;
( , , liquidity) = IUniswapV2Router01(routerAddr).addLiquidity(_from, other, amount.sub(sellAmount), otherAmount, 0, 0, recipient, block.timestamp);
return liquidity;
} else {
// go through native token for highest liquidity
uint nativeAmount = _swapTokenForNative(_from, amount, address(this), routerAddr);
return _swapNativeToLP(_to, nativeAmount, recipient, routerAddr);
}
}
function _swapNativeToLP(address _LP, uint amount, address recipient, address routerAddress) private returns (uint) {
// LP
IUniswapV2Pair pair = IUniswapV2Pair(_LP);
address token0 = pair.token0();
address token1 = pair.token1();
uint liquidity;
if (token0 == WNATIVE || token1 == WNATIVE) {
address token = token0 == WNATIVE ? token1 : token0;
( , , liquidity) = _swapHalfNativeAndProvide(token, amount, routerAddress, recipient);
} else {
( , , liquidity) = _swapNativeToEqualTokensAndProvide(token0, token1, amount, routerAddress, recipient);
}
return liquidity;
}
function _swapHalfNativeAndProvide(address token, uint amount, address routerAddress, address recipient) private returns (uint, uint, uint) {
uint swapValue = amount.div(2);
uint tokenAmount = _swapNativeForToken(token, swapValue, address(this), routerAddress);
_approveTokenIfNeeded(token, routerAddress);
if (useNativeRouter[routerAddress]) {
IHyperswapRouter01 router = IHyperswapRouter01(routerAddress);
return router.addLiquidityFTM{value : amount.sub(swapValue)}(token, tokenAmount, 0, 0, recipient, block.timestamp);
}
else {
IUniswapV2Router01 router = IUniswapV2Router01(routerAddress);
return router.addLiquidityETH{value : amount.sub(swapValue)}(token, tokenAmount, 0, 0, recipient, block.timestamp);
}
}
function _swapNativeToEqualTokensAndProvide(address token0, address token1, uint amount, address routerAddress, address recipient) private returns (uint, uint, uint) {
uint swapValue = amount.div(2);
uint token0Amount = _swapNativeForToken(token0, swapValue, address(this), routerAddress);
uint token1Amount = _swapNativeForToken(token1, amount.sub(swapValue), address(this), routerAddress);
_approveTokenIfNeeded(token0, routerAddress);
_approveTokenIfNeeded(token1, routerAddress);
IUniswapV2Router01 router = IUniswapV2Router01(routerAddress);
return router.addLiquidity(token0, token1, token0Amount, token1Amount, 0, 0, recipient, block.timestamp);
}
function _swapNativeForToken(address token, uint value, address recipient, address routerAddr) private returns (uint) {
address[] memory path;
IUniswapV2Router01 router = IUniswapV2Router01(routerAddr);
if (tokenBridgeForRouter[token][routerAddr] != address(0)) {
path = new address[](3);
path[0] = WNATIVE;
path[1] = tokenBridgeForRouter[token][routerAddr];
path[2] = token;
} else {
path = new address[](2);
path[0] = WNATIVE;
path[1] = token;
}
uint[] memory amounts = router.swapExactETHForTokens{value : value}(0, path, recipient, block.timestamp);
return amounts[amounts.length - 1];
}
function _swapTokenForNative(address token, uint amount, address recipient, address routerAddr) private returns (uint) {
address[] memory path;
IUniswapV2Router01 router = IUniswapV2Router01(routerAddr);
if (tokenBridgeForRouter[token][routerAddr] != address(0)) {
path = new address[](3);
path[0] = token;
path[1] = tokenBridgeForRouter[token][routerAddr];
path[2] = router.WETH();
} else {
path = new address[](2);
path[0] = token;
path[1] = router.WETH();
}
if (isFeeOnTransfer[token]) {
router.swapExactTokensForETHSupportingFeeOnTransferTokens(amount, 0, path, recipient, block.timestamp);
return IERC20(token).balanceOf(address(this));
} else {
uint[] memory amounts = router.swapExactTokensForETH(amount, 0, path, recipient, block.timestamp);
return amounts[amounts.length - 1];
}
}
function _swap(address _from, uint amount, address _to, address recipient, address routerAddr) private returns (uint) {
IUniswapV2Router01 router = IUniswapV2Router01(routerAddr);
address fromBridge = tokenBridgeForRouter[_from][routerAddr];
address toBridge = tokenBridgeForRouter[_to][routerAddr];
address[] memory path;
if (fromBridge != address(0) && toBridge != address(0)) { // both have bridge
if (fromBridge != toBridge) {
path = new address[](5);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
path[3] = toBridge;
path[4] = _to;
} else {
path = new address[](3);
path[0] = _from;
path[1] = fromBridge;
path[2] = _to;
}
} else if (fromBridge != address(0)) { // from has bridge
if (fromBridge == _to) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
}
else if (_to == WNATIVE) {
path = new address[](3);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
} else {
path = new address[](4);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
path[3] = _to;
}
} else if (toBridge != address(0)) { // only _to ha a bridge, not _from
if (_from == toBridge) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
} else if (_from == WNATIVE) {
path = new address[](3);
path[0] = WNATIVE;
path[1] = toBridge;
path[2] = _to;
}
else {
path = new address[](4);
path[0] = _from;
path[1] = WNATIVE;
path[2] = toBridge;
path[3] = _to;
}
} else if (_from == WNATIVE || _to == WNATIVE) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
} else {
// Go through WNative
path = new address[](3);
path[0] = _from;
path[1] = WNATIVE;
path[2] = _to;
}
uint[] memory amounts;
if (isFeeOnTransfer[_from]) {
router.swapExactTokensForTokensSupportingFeeOnTransferTokens(amount, 0, path, recipient, block.timestamp);
return IERC20(_to).balanceOf(address(this));
} else {
amounts = router.swapExactTokensForTokens(amount, 0, path, recipient, block.timestamp);
}
return amounts[amounts.length - 1];
}
function _estimateSwap(address _from, uint amount, address _to, address routerAddr) private view returns (uint) {
IUniswapV2Router01 router = IUniswapV2Router01(routerAddr);
address fromBridge = tokenBridgeForRouter[_from][routerAddr];
address toBridge = tokenBridgeForRouter[_to][routerAddr];
address[] memory path;
if (fromBridge != address(0) && toBridge != address(0)) {
if (fromBridge != toBridge) {
path = new address[](5);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
path[3] = toBridge;
path[4] = _to;
} else {
path = new address[](3);
path[0] = _from;
path[1] = fromBridge;
path[2] = _to;
}
} else if (fromBridge != address(0)) {
if (fromBridge == _to) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
}
else if (_to == WNATIVE) {
path = new address[](3);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
} else {
path = new address[](4);
path[0] = _from;
path[1] = fromBridge;
path[2] = WNATIVE;
path[3] = _to;
}
} else if (toBridge != address(0)) {
if (_from == toBridge) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
} else if (_from == WNATIVE) {
path = new address[](3);
path[0] = WNATIVE;
path[1] = toBridge;
path[2] = _to;
}
else {
path = new address[](4);
path[0] = _from;
path[1] = WNATIVE;
path[2] = toBridge;
path[3] = _to;
}
} else if (_from == WNATIVE || _to == WNATIVE) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
} else {
// Go through WNative
path = new address[](3);
path[0] = _from;
path[1] = WNATIVE;
path[2] = _to;
}
uint[] memory amounts = router.getAmountsOut(amount, path);
return amounts[amounts.length - 1];
}
/* ========== RESTRICTED FUNCTIONS ========== */
function setTokenBridgeForRouter(address token, address router, address bridgeToken) external onlyOwner {
tokenBridgeForRouter[token][router] = bridgeToken;
}
function setValidRouter(address _validRouter) external onlyOwner {
validRouter = _validRouter;
}
function withdraw(address token) external onlyOwner {
if (token == address(0)) {
payable(owner()).transfer(address(this).balance);
return;
}
IERC20(token).transfer(owner(), IERC20(token).balanceOf(address(this)));
}
function setUseNativeRouter(address router) external onlyOwner {
useNativeRouter[router] = true;
}
function setIsFeeOnTransfer(address token) external onlyOwner {
isFeeOnTransfer[token] = true;
}
}