Contract Name:
UniswapV2_ZapOut_General_V2
Contract Source Code:
File 1 of 1 : UniswapV2_ZapOut_General_V2
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @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, 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) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @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) {
// 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 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message 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.
*
* _Available since v2.4.0._
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts 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 mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message 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.
*
* _Available since v2.4.0._
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/contracts/GSN/Context.sol
pragma solidity ^0.5.0;
/*
* @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 GSN 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.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor() internal {}
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0;
/**
* @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.
*
* 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.
*/
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() internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return _msgSender() == _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 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 onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(
newOwner != address(0),
"Ownable: new owner is the zero address"
);
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
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
);
}
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.5.5;
/**
* @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) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash
= 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly {
codehash := extcodehash(account)
}
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account)
internal
pure
returns (address payable)
{
return address(uint160(account));
}
/**
* @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].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(
address(this).balance >= amount,
"Address: insufficient balance"
);
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(
success,
"Address: unable to send value, recipient may have reverted"
);
}
}
// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol
pragma solidity ^0.5.0;
/**
* @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].
*
* _Since v2.5.0:_ this module is now much more gas efficient, given net gas
* metering changes introduced in the Istanbul hardfork.
*/
contract ReentrancyGuard {
bool private _notEntered;
constructor() internal {
// Storing an initial 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 percetange 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.
_notEntered = true;
}
/**
* @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(_notEntered, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_notEntered = false;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_notEntered = true;
}
}
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
pragma solidity ^0.5.0;
/**
* @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 ERC20;` 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)
);
}
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.
// A Solidity high level call has three parts:
// 1. The target address is checked to verify it contains contract code
// 2. The call itself is made, and success asserted
// 3. The return value is decoded, which in turn checks the size of the returned data.
// solhint-disable-next-line max-line-length
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "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: contracts/UniswapV2/UniswapV2Router.sol
pragma solidity 0.5.12;
interface IUniswapV2Router02 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
external
returns (
uint256 amountA,
uint256 amountB,
uint256 liquidity
);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (
uint256 amountToken,
uint256 amountETH,
uint256 liquidity
);
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountsOut(uint256 amountIn, address[] calldata path)
external
view
returns (uint256[] memory amounts);
function getAmountsIn(uint256 amountOut, address[] calldata path)
external
view
returns (uint256[] memory amounts);
}
// File: contracts/UniswapV2/UniswapV2_ZapOut_General_V2.sol
pragma solidity 0.5.12;
// Copyright (C) 2020 dipeshsukhani, nodarjanashia, suhailg, apoorvlathey, sebaudet, sumit
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// Visit <https://www.gnu.org/licenses/>for a copy of the GNU Affero General Public License
///@author Zapper
///@notice this contract implements one click removal of liquidity from Uniswap V2 pools, receiving ETH, ERC tokens or both.
library TransferHelper {
function safeApprove(
address token,
address to,
uint256 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,
uint256 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,
uint256 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"
);
}
}
interface Iuniswap {
// converting ERC20 to ERC20 and transfer
function tokenToTokenTransferInput(
uint256 tokens_sold,
uint256 min_tokens_bought,
uint256 min_eth_bought,
uint256 deadline,
address recipient,
address token_addr
) external returns (uint256 tokens_bought);
function tokenToTokenSwapInput(
uint256 tokens_sold,
uint256 min_tokens_bought,
uint256 min_eth_bought,
uint256 deadline,
address token_addr
) external returns (uint256 tokens_bought);
function getTokenToEthInputPrice(uint256 tokens_sold)
external
view
returns (uint256 eth_bought);
function tokenToEthTransferInput(
uint256 tokens_sold,
uint256 min_eth,
uint256 deadline,
address recipient
) external returns (uint256 eth_bought);
function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline)
external
payable
returns (uint256 tokens_bought);
function ethToTokenTransferInput(
uint256 min_tokens,
uint256 deadline,
address recipient
) external payable returns (uint256 tokens_bought);
function balanceOf(address _owner) external view returns (uint256);
function transfer(address _to, uint256 _value) external returns (bool);
function transferFrom(
address from,
address to,
uint256 tokens
) external returns (bool success);
}
interface IUniswapV2Pair {
function token0() external pure returns (address);
function token1() external pure returns (address);
function totalSupply() external view returns (uint256);
function getReserves()
external
view
returns (
uint112 _reserve0,
uint112 _reserve1,
uint32 _blockTimestampLast
);
}
interface IWETH {
function deposit() external payable;
function transfer(address to, uint256 value) external returns (bool);
function withdraw(uint256) external;
}
interface IUniswapV2Factory {
function getPair(address tokenA, address tokenB)
external
view
returns (address);
}
contract UniswapV2_ZapOut_General_V2 is ReentrancyGuard, Ownable {
using SafeMath for uint256;
using Address for address;
bool private stopped = false;
uint16 public goodwill;
address public dzgoodwillAddress;
IUniswapV2Router02 public uniswapV2Router = IUniswapV2Router02(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
);
IUniswapV2Factory public UniSwapV2FactoryAddress = IUniswapV2Factory(
0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f
);
address public wethTokenAddress = address(
0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
);
constructor(uint16 _goodwill, address _dzgoodwillAddress) public {
goodwill = _goodwill;
dzgoodwillAddress = _dzgoodwillAddress;
}
// circuit breaker modifiers
modifier stopInEmergency {
if (stopped) {
revert("Temporarily Paused");
} else {
_;
}
}
/**
@notice This function is used to zapout of given Uniswap pair in the bounded tokens
@param _FromUniPoolAddress The uniswap pair address to zapout
@param _IncomingLP The amount of LP
@return the amount of pair tokens received after zapout
*/
function ZapOut2PairToken(
address _FromUniPoolAddress,
uint256 _IncomingLP
)
public
payable
nonReentrant
stopInEmergency
returns (uint256 amountA, uint256 amountB)
{
IUniswapV2Pair pair = IUniswapV2Pair(_FromUniPoolAddress);
require(address(pair) != address(0), "Error: Invalid Unipool Address");
//get reserves
address token0 = pair.token0();
address token1 = pair.token1();
TransferHelper.safeTransferFrom(
_FromUniPoolAddress,
msg.sender,
address(this),
_IncomingLP
);
uint256 goodwillPortion = _transferGoodwill(
_FromUniPoolAddress,
_IncomingLP
);
TransferHelper.safeApprove(
_FromUniPoolAddress,
address(uniswapV2Router),
SafeMath.sub(_IncomingLP, goodwillPortion)
);
if (token0 == wethTokenAddress || token1 == wethTokenAddress) {
address _token = token0 == wethTokenAddress ? token1 : token0;
(amountA, amountB) = uniswapV2Router.removeLiquidityETH(
_token,
SafeMath.sub(_IncomingLP, goodwillPortion),
1,
1,
msg.sender,
now + 60
);
} else {
(amountA, amountB) = uniswapV2Router.removeLiquidity(
token0,
token1,
SafeMath.sub(_IncomingLP, goodwillPortion),
1,
1,
msg.sender,
now + 60
);
}
}
/**
@notice This function is used to zapout of given Uniswap pair in ETH/ERC20 Tokens
@param _ToTokenContractAddress The ERC20 token to zapout in (address(0x00) if ether)
@param _FromUniPoolAddress The uniswap pair address to zapout from
@param _IncomingLP The amount of LP
@return the amount of eth/tokens received after zapout
*/
function ZapOut(
address _ToTokenContractAddress,
address _FromUniPoolAddress,
uint256 _IncomingLP,
uint256 _minTokensRec
) public payable nonReentrant stopInEmergency returns (uint256) {
IUniswapV2Pair pair = IUniswapV2Pair(_FromUniPoolAddress);
require(address(pair) != address(0), "Error: Invalid Unipool Address");
//get pair tokens
address token0 = pair.token0();
address token1 = pair.token1();
TransferHelper.safeTransferFrom(
_FromUniPoolAddress,
msg.sender,
address(this),
_IncomingLP
);
uint256 goodwillPortion = _transferGoodwill(
_FromUniPoolAddress,
_IncomingLP
);
TransferHelper.safeApprove(
_FromUniPoolAddress,
address(uniswapV2Router),
SafeMath.sub(_IncomingLP, goodwillPortion)
);
(uint256 amountA, uint256 amountB) = uniswapV2Router.removeLiquidity(
token0,
token1,
SafeMath.sub(_IncomingLP, goodwillPortion),
1,
1,
address(this),
now + 60
);
uint256 tokenBought;
if (
canSwapFromV2(_ToTokenContractAddress, token0) &&
canSwapFromV2(_ToTokenContractAddress, token1)
) {
tokenBought = swapFromV2(token0, _ToTokenContractAddress, amountA);
tokenBought += swapFromV2(token1, _ToTokenContractAddress, amountB);
} else if (canSwapFromV2(_ToTokenContractAddress, token0)) {
uint256 token0Bought = swapFromV2(token1, token0, amountB);
tokenBought = swapFromV2(
token0,
_ToTokenContractAddress,
token0Bought.add(amountA)
);
} else if (canSwapFromV2(_ToTokenContractAddress, token1)) {
uint256 token1Bought = swapFromV2(token0, token1, amountA);
tokenBought = swapFromV2(
token1,
_ToTokenContractAddress,
token1Bought.add(amountB)
);
}
require(tokenBought >= _minTokensRec, "High slippage");
if (_ToTokenContractAddress == address(0)) {
msg.sender.transfer(tokenBought);
} else {
TransferHelper.safeTransfer(
_ToTokenContractAddress,
msg.sender,
tokenBought
);
}
return tokenBought;
}
//swaps _fromToken for _toToken
//for eth, address(0) otherwise ERC token address
function swapFromV2(
address _fromToken,
address _toToken,
uint256 amount
) internal returns (uint256) {
require(
_fromToken != address(0) || _toToken != address(0),
"Invalid Exchange values"
);
if (_fromToken == _toToken) return amount;
require(canSwapFromV2(_fromToken, _toToken), "Cannot be exchanged");
require(amount > 0, "Invalid amount");
if (_fromToken == address(0)) {
if (_toToken == wethTokenAddress) {
IWETH(wethTokenAddress).deposit.value(amount)();
return amount;
}
address[] memory path = new address[](2);
path[0] = wethTokenAddress;
path[1] = _toToken;
uint256 minTokens = uniswapV2Router.getAmountsOut(amount, path)[1];
minTokens = SafeMath.div(
SafeMath.mul(minTokens, SafeMath.sub(10000, 200)),
10000
);
uint256[] memory amounts = uniswapV2Router
.swapExactETHForTokens
.value(amount)(minTokens, path, address(this), now + 180);
return amounts[1];
} else if (_toToken == address(0)) {
if (_fromToken == wethTokenAddress) {
IWETH(wethTokenAddress).withdraw(amount);
return amount;
}
address[] memory path = new address[](2);
TransferHelper.safeApprove(
_fromToken,
address(uniswapV2Router),
amount
);
path[0] = _fromToken;
path[1] = wethTokenAddress;
uint256 minTokens = uniswapV2Router.getAmountsOut(amount, path)[1];
minTokens = SafeMath.div(
SafeMath.mul(minTokens, SafeMath.sub(10000, 200)),
10000
);
uint256[] memory amounts = uniswapV2Router.swapExactTokensForETH(
amount,
minTokens,
path,
address(this),
now + 180
);
return amounts[1];
} else {
TransferHelper.safeApprove(
_fromToken,
address(uniswapV2Router),
amount
);
uint256 returnedAmount = _swapTokenToTokenV2(
_fromToken,
_toToken,
amount
);
require(returnedAmount > 0, "Error in swap");
return returnedAmount;
}
}
//swaps 2 ERC tokens (UniV2)
function _swapTokenToTokenV2(
address _fromToken,
address _toToken,
uint256 amount
) internal returns (uint256) {
IUniswapV2Pair pair1 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_fromToken, wethTokenAddress)
);
IUniswapV2Pair pair2 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_toToken, wethTokenAddress)
);
IUniswapV2Pair pair3 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_fromToken, _toToken)
);
uint256[] memory amounts;
if (_haveReserve(pair3)) {
address[] memory path = new address[](2);
path[0] = _fromToken;
path[1] = _toToken;
uint256 minTokens = uniswapV2Router.getAmountsOut(amount, path)[1];
minTokens = SafeMath.div(
SafeMath.mul(minTokens, SafeMath.sub(10000, 200)),
10000
);
amounts = uniswapV2Router.swapExactTokensForTokens(
amount,
minTokens,
path,
address(this),
now + 180
);
return amounts[1];
} else if (_haveReserve(pair1) && _haveReserve(pair2)) {
address[] memory path = new address[](3);
path[0] = _fromToken;
path[1] = wethTokenAddress;
path[2] = _toToken;
uint256 minTokens = uniswapV2Router.getAmountsOut(amount, path)[2];
minTokens = SafeMath.div(
SafeMath.mul(minTokens, SafeMath.sub(10000, 200)),
10000
);
amounts = uniswapV2Router.swapExactTokensForTokens(
amount,
minTokens,
path,
address(this),
now + 180
);
return amounts[2];
}
return 0;
}
function canSwapFromV2(address _fromToken, address _toToken)
public
view
returns (bool)
{
require(
_fromToken != address(0) || _toToken != address(0),
"Invalid Exchange values"
);
if (_fromToken == _toToken) return true;
if (_fromToken == address(0) || _fromToken == wethTokenAddress) {
if (_toToken == wethTokenAddress || _toToken == address(0))
return true;
IUniswapV2Pair pair = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_toToken, wethTokenAddress)
);
if (_haveReserve(pair)) return true;
} else if (_toToken == address(0) || _toToken == wethTokenAddress) {
if (_fromToken == wethTokenAddress || _fromToken == address(0))
return true;
IUniswapV2Pair pair = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_fromToken, wethTokenAddress)
);
if (_haveReserve(pair)) return true;
} else {
IUniswapV2Pair pair1 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_fromToken, wethTokenAddress)
);
IUniswapV2Pair pair2 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_toToken, wethTokenAddress)
);
IUniswapV2Pair pair3 = IUniswapV2Pair(
UniSwapV2FactoryAddress.getPair(_fromToken, _toToken)
);
if (_haveReserve(pair1) && _haveReserve(pair2)) return true;
if (_haveReserve(pair3)) return true;
}
return false;
}
//checks if the UNI v2 contract have reserves to swap tokens
function _haveReserve(IUniswapV2Pair pair) internal view returns (bool) {
if (address(pair) != address(0)) {
uint256 totalSupply = pair.totalSupply();
if (totalSupply > 0) return true;
}
}
/**
@notice This function is used to calculate and transfer goodwill
@param _tokenContractAddress Token in which goodwill is deducted
@param tokens2Trade The total amount of tokens to be zapped in
@return The quantity of goodwill deducted
*/
function _transferGoodwill(
address _tokenContractAddress,
uint256 tokens2Trade
) internal returns (uint256 goodwillPortion) {
if (goodwill == 0) {
return 0;
}
goodwillPortion = SafeMath.div(
SafeMath.mul(tokens2Trade, goodwill),
10000
);
TransferHelper.safeTransfer(
_tokenContractAddress,
dzgoodwillAddress,
goodwillPortion
);
}
function set_new_goodwill(uint16 _new_goodwill) public onlyOwner {
require(
_new_goodwill >= 0 && _new_goodwill < 10000,
"GoodWill Value not allowed"
);
goodwill = _new_goodwill;
}
function set_new_dzgoodwillAddress(address _new_dzgoodwillAddress)
public
onlyOwner
{
dzgoodwillAddress = _new_dzgoodwillAddress;
}
function inCaseTokengetsStuck(IERC20 _TokenAddress) public onlyOwner {
uint256 qty = _TokenAddress.balanceOf(address(this));
TransferHelper.safeTransfer(address(_TokenAddress), owner(), qty);
}
// - to Pause the contract
function toggleContractActive() public onlyOwner {
stopped = !stopped;
}
// - to withdraw any ETH balance sitting in the contract
function withdraw() public onlyOwner {
uint256 contractBalance = address(this).balance;
address payable _to = owner().toPayable();
_to.transfer(contractBalance);
}
function() external payable {}
}