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// Copyright (C) 2020 zapper, nodar, suhail, seb, sumit, apoorv
// 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.
//
///@author Zapper
///@notice This contract adds/removes liquidity to/from yEarn Vaults using ETH or ERC20 Tokens.
// SPDX-License-Identifier: GPLv2
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol
pragma solidity ^0.6.0;
/**
* @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.
*/
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.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
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.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol
pragma solidity ^0.6.0;
/**
* @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].
*/
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;
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.6.0;
/**
* @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
);
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol
pragma solidity ^0.6.2;
/**
* @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 in 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"
);
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(
address target,
bytes memory data,
uint256 weiValue,
string memory errorMessage
) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{value: weiValue}(
data
);
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);
}
}
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/GSN/Context.sol
pragma solidity ^0.6.0;
/*
* @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.
*/
abstract contract Context {
function _msgSender() internal virtual view returns (address payable) {
return msg.sender;
}
function _msgData() internal virtual view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
pragma solidity ^0.6.0;
/**
* @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.
*
* 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.
*/
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(_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: yVault_ZapInOut_General_V1_2.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");
}
}
}
interface IUniswapV2Factory {
function getPair(address tokenA, address tokenB)
external
view
returns (address);
}
interface IUniswapRouter02 {
//get estimated amountOut
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);
//token 2 token
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);
//eth 2 token
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
//token 2 eth
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);
}
interface yVault {
function deposit(uint256) external;
function withdraw(uint256) external;
function getPricePerFullShare() external view returns (uint256);
function token() external view returns (address);
}
interface ICurveZapInGeneral {
function ZapIn(
address _toWhomToIssue,
address _IncomingTokenAddress,
address _curvePoolExchangeAddress,
uint256 _IncomingTokenQty,
uint256 _minPoolTokens
) external payable returns (uint256 crvTokensBought);
}
interface ICurveZapOutGeneral {
function ZapOut(
address payable _toWhomToIssue,
address _curveExchangeAddress,
uint256 _tokenCount,
uint256 _IncomingCRV,
address _ToTokenAddress,
uint256 _minToTokens
) external returns (uint256 ToTokensBought);
}
interface IAaveLendingPoolAddressesProvider {
function getLendingPool() external view returns (address);
function getLendingPoolCore() external view returns (address payable);
}
interface IAaveLendingPool {
function deposit(
address _reserve,
uint256 _amount,
uint16 _referralCode
) external payable;
}
interface IAToken {
function redeem(uint256 _amount) external;
function underlyingAssetAddress() external returns (address);
}
interface IWETH {
function deposit() external payable;
function withdraw(uint256) external;
}
contract yVault_ZapInOut_General_V1_3 is ReentrancyGuard, Ownable {
using SafeMath for uint256;
using Address for address;
using SafeERC20 for IERC20;
bool public stopped = false;
uint16 public goodwill;
IUniswapV2Factory
private constant UniSwapV2FactoryAddress = IUniswapV2Factory(
0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f
);
IUniswapRouter02 private constant uniswapRouter = IUniswapRouter02(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
);
ICurveZapInGeneral public CurveZapInGeneral = ICurveZapInGeneral(
0x456974dF1042bA7A46FD49512A8778Ac3B840A21
);
ICurveZapOutGeneral public CurveZapOutGeneral = ICurveZapOutGeneral(
0x4bF331Aa2BfB0869315fB81a350d109F4839f81b
);
IAaveLendingPoolAddressesProvider
private constant lendingPoolAddressProvider = IAaveLendingPoolAddressesProvider(
0x24a42fD28C976A61Df5D00D0599C34c4f90748c8
);
address private constant yCurveExchangeAddress = 0xbBC81d23Ea2c3ec7e56D39296F0cbB648873a5d3;
address private constant sBtcCurveExchangeAddress = 0x7fC77b5c7614E1533320Ea6DDc2Eb61fa00A9714;
address private constant bUSDCurveExchangeAddress = 0xb6c057591E073249F2D9D88Ba59a46CFC9B59EdB;
address private constant yCurvePoolTokenAddress = 0xdF5e0e81Dff6FAF3A7e52BA697820c5e32D806A8;
address private constant sBtcCurvePoolTokenAddress = 0x075b1bb99792c9E1041bA13afEf80C91a1e70fB3;
address private constant bUSDCurvePoolTokenAddress = 0x3B3Ac5386837Dc563660FB6a0937DFAa5924333B;
mapping(address => address) internal token2Exchange;
address
private constant ETHAddress = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
address
private constant wethTokenAddress = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
address
private constant zgoodwillAddress = 0xE737b6AfEC2320f616297e59445b60a11e3eF75F;
uint256
private constant deadline = 0xf000000000000000000000000000000000000000000000000000000000000000;
event Zapin(
address _toWhomToIssue,
address _toYVaultAddress,
uint256 _Outgoing
);
event Zapout(
address _toWhomToIssue,
address _fromYVaultAddress,
address _toTokenAddress,
uint256 _tokensRecieved
);
constructor(uint16 _goodwill) public {
goodwill = _goodwill;
token2Exchange[yCurvePoolTokenAddress] = yCurveExchangeAddress;
token2Exchange[bUSDCurvePoolTokenAddress] = bUSDCurveExchangeAddress;
token2Exchange[sBtcCurvePoolTokenAddress] = sBtcCurveExchangeAddress;
}
// circuit breaker modifiers
modifier stopInEmergency {
if (stopped) {
revert("Temporarily Paused");
} else {
_;
}
}
function updateCurveZapIn(address CurveZapInGeneralAddress)
public
onlyOwner
{
require(CurveZapInGeneralAddress != address(0), "Invalid Address");
CurveZapInGeneral = ICurveZapInGeneral(CurveZapInGeneralAddress);
}
function updateCurveZapOut(address CurveZapOutGeneralAddress)
public
onlyOwner
{
require(CurveZapOutGeneralAddress != address(0), "Invalid Address");
CurveZapOutGeneral = ICurveZapOutGeneral(CurveZapOutGeneralAddress);
}
function addNewCurveExchange(address curvePoolToken, address curveExchangeAddress)
public
onlyOwner
{
require(curvePoolToken != address(0) && curveExchangeAddress != address(0), "Invalid Address");
token2Exchange[curvePoolToken] = curveExchangeAddress;
}
/**
@notice This function is used to add liquidity to yVaults
@param _toWhomToIssue recipient address
@param _toYVaultAddress The address of vault to add liquidity to
@param _vaultType Type of underlying token: 0 token; 1 aToken; 2 LP token
@param _fromTokenAddress The token used for investment (address(0x00) if ether)
@param _amount The amount of ERC to invest
@param _minTokensSwapped for slippage
@return yTokensRec
*/
function ZapIn(
address _toWhomToIssue,
address _toYVaultAddress,
uint16 _vaultType,
address _fromTokenAddress,
uint256 _amount,
uint256 _minTokensSwapped
) public payable nonReentrant stopInEmergency returns (uint256) {
yVault vaultToEnter = yVault(_toYVaultAddress);
address underlyingVaultToken = vaultToEnter.token();
if (_fromTokenAddress == address(0)) {
require(msg.value > 0, "ERR: No ETH sent");
} else {
require(_amount > 0, "Err: No Tokens Sent");
require(msg.value == 0, "ERR: ETH sent with Token");
IERC20(_fromTokenAddress).safeTransferFrom(
msg.sender,
address(this),
_amount
);
}
if (underlyingVaultToken == _fromTokenAddress) {
IERC20(underlyingVaultToken).safeApprove(
address(vaultToEnter),
_amount
);
vaultToEnter.deposit(_amount);
} else {
// Curve Vaults
if (_vaultType == 2) {
address curveExchangeAddr = token2Exchange[underlyingVaultToken];
uint256 tokensBought;
if (_fromTokenAddress == address(0)) {
tokensBought = CurveZapInGeneral.ZapIn{value: msg.value}(
address(this),
address(0),
curveExchangeAddr,
msg.value,
_minTokensSwapped
);
} else {
IERC20(_fromTokenAddress).safeApprove(
address(CurveZapInGeneral),
_amount
);
tokensBought = CurveZapInGeneral.ZapIn(
address(this),
_fromTokenAddress,
curveExchangeAddr,
_amount,
_minTokensSwapped
);
}
IERC20(underlyingVaultToken).safeApprove(
address(vaultToEnter),
tokensBought
);
vaultToEnter.deposit(tokensBought);
} else if (_vaultType == 1) {
address underlyingAsset = IAToken(underlyingVaultToken)
.underlyingAssetAddress();
uint256 tokensBought;
if (_fromTokenAddress == address(0)) {
tokensBought = _eth2Token(
underlyingAsset,
_minTokensSwapped
);
} else {
tokensBought = _token2Token(
_fromTokenAddress,
underlyingAsset,
_amount,
_minTokensSwapped
);
}
IERC20(underlyingAsset).safeApprove(
lendingPoolAddressProvider.getLendingPoolCore(),
tokensBought
);
IAaveLendingPool(lendingPoolAddressProvider.getLendingPool())
.deposit(underlyingAsset, tokensBought, 0);
uint256 aTokensBought = IERC20(underlyingVaultToken).balanceOf(
address(this)
);
IERC20(underlyingVaultToken).safeApprove(
address(vaultToEnter),
aTokensBought
);
vaultToEnter.deposit(aTokensBought);
} else {
uint256 tokensBought;
if (_fromTokenAddress == address(0)) {
tokensBought = _eth2Token(
underlyingVaultToken,
_minTokensSwapped
);
} else {
tokensBought = _token2Token(
_fromTokenAddress,
underlyingVaultToken,
_amount,
_minTokensSwapped
);
}
IERC20(underlyingVaultToken).safeApprove(
address(vaultToEnter),
tokensBought
);
vaultToEnter.deposit(tokensBought);
}
}
uint256 yTokensRec = IERC20(address(vaultToEnter)).balanceOf(
address(this)
);
//transfer goodwill
uint256 goodwillPortion = _transferGoodwill(
address(vaultToEnter),
yTokensRec
);
IERC20(address(vaultToEnter)).safeTransfer(
_toWhomToIssue,
yTokensRec.sub(goodwillPortion)
);
emit Zapin(
_toWhomToIssue,
address(vaultToEnter),
yTokensRec.sub(goodwillPortion)
);
return (yTokensRec.sub(goodwillPortion));
}
/**
@notice This function is used to remove liquidity from yVaults
@param _toWhomToIssue recipient address
@param _ToTokenContractAddress The address of the token to withdraw
@param _fromYVaultAddress The address of the vault to exit
@param _vaultType Type of underlying token: 0 token; 1 aToken; 2 LP token
@param _IncomingAmt The amount of vault tokens removed
@param _minTokensRec for slippage
@return toTokensReceived
*/
function ZapOut(
address _toWhomToIssue,
address _ToTokenContractAddress,
address _fromYVaultAddress,
uint16 _vaultType,
uint256 _IncomingAmt,
uint256 _minTokensRec
) public nonReentrant stopInEmergency returns (uint256) {
yVault vaultToExit = yVault(_fromYVaultAddress);
address underlyingVaultToken = vaultToExit.token();
IERC20(address(vaultToExit)).safeTransferFrom(
msg.sender,
address(this),
_IncomingAmt
);
uint256 goodwillPortion = _transferGoodwill(
address(vaultToExit),
_IncomingAmt
);
vaultToExit.withdraw(_IncomingAmt.sub(goodwillPortion));
uint256 underlyingReceived = IERC20(underlyingVaultToken).balanceOf(
address(this)
);
uint256 toTokensReceived;
if(_ToTokenContractAddress == underlyingVaultToken) {
IERC20(underlyingVaultToken).safeTransfer(
_toWhomToIssue,
underlyingReceived
);
toTokensReceived = underlyingReceived;
} else {
if(_vaultType == 2) {
toTokensReceived = _withdrawFromCurve(
underlyingVaultToken,
underlyingReceived,
_toWhomToIssue,
_ToTokenContractAddress,
_minTokensRec
);
} else if(_vaultType == 1) {
// unwrap atoken
IAToken(underlyingVaultToken).redeem(underlyingReceived);
address underlyingAsset = IAToken(underlyingVaultToken)
.underlyingAssetAddress();
// swap
if(_ToTokenContractAddress == address(0)) {
toTokensReceived = _token2Eth(
underlyingAsset,
underlyingReceived,
payable(_toWhomToIssue),
_minTokensRec
);
} else {
toTokensReceived = _token2Token(
underlyingAsset,
_ToTokenContractAddress,
underlyingReceived,
_minTokensRec
);
IERC20(_ToTokenContractAddress).safeTransfer(
_toWhomToIssue,
toTokensReceived
);
}
} else {
if(_ToTokenContractAddress == address(0)) {
toTokensReceived = _token2Eth(
underlyingVaultToken,
underlyingReceived,
payable(_toWhomToIssue),
_minTokensRec
);
} else {
toTokensReceived = _token2Token(
underlyingVaultToken,
_ToTokenContractAddress,
underlyingReceived,
_minTokensRec
);
IERC20(_ToTokenContractAddress).safeTransfer(
_toWhomToIssue,
toTokensReceived
);
}
}
}
emit Zapout(
_toWhomToIssue,
_fromYVaultAddress,
_ToTokenContractAddress,
toTokensReceived
);
return toTokensReceived;
}
function _withdrawFromCurve(
address _CurvePoolToken,
uint256 _tokenAmt,
address _toWhomToIssue,
address _ToTokenContractAddress,
uint256 _minTokensRec
) internal returns(uint256) {
IERC20(_CurvePoolToken).safeApprove(
address(CurveZapOutGeneral),
_tokenAmt
);
address curveExchangeAddr = token2Exchange[_CurvePoolToken];
uint256 tokenCount = 4;
if(curveExchangeAddr == sBtcCurveExchangeAddress) {
tokenCount = 3;
}
return(
CurveZapOutGeneral.ZapOut(
payable(_toWhomToIssue),
curveExchangeAddr,
tokenCount,
_tokenAmt,
_ToTokenContractAddress,
_minTokensRec
)
);
}
/**
@notice This function is used to swap eth for tokens
@param _tokenContractAddress Token address which we want to buy
@param minTokens recieved after swap for slippage
@return tokensBought The quantity of token bought
*/
function _eth2Token(address _tokenContractAddress, uint256 minTokens)
internal
returns (uint256 tokensBought)
{
if(_tokenContractAddress == wethTokenAddress) {
IWETH(wethTokenAddress).deposit{value: msg.value}();
return msg.value;
}
address[] memory path = new address[](2);
path[0] = wethTokenAddress;
path[1] = _tokenContractAddress;
tokensBought = uniswapRouter.swapExactETHForTokens{value: msg.value}(
1,
path,
address(this),
deadline
)[path.length - 1];
require(tokensBought >= minTokens, "ERR: High Slippage");
}
/**
@notice This function is used to swap tokens
@param _FromTokenContractAddress The token address to swap from
@param _ToTokenContractAddress The token address to swap to
@param tokens2Trade The amount of tokens to swap
@param minTokens recieved after swap for slippage
@return tokenBought The quantity of tokens bought
*/
function _token2Token(
address _FromTokenContractAddress,
address _ToTokenContractAddress,
uint256 tokens2Trade,
uint256 minTokens
) internal returns (uint256 tokenBought) {
if (_FromTokenContractAddress == _ToTokenContractAddress) {
return tokens2Trade;
}
IERC20(_FromTokenContractAddress).safeApprove(
address(uniswapRouter),
tokens2Trade
);
if (_FromTokenContractAddress != wethTokenAddress) {
if (_ToTokenContractAddress != wethTokenAddress) {
address[] memory path = new address[](3);
path[0] = _FromTokenContractAddress;
path[1] = wethTokenAddress;
path[2] = _ToTokenContractAddress;
tokenBought = uniswapRouter.swapExactTokensForTokens(
tokens2Trade,
1,
path,
address(this),
deadline
)[path.length - 1];
} else {
address[] memory path = new address[](2);
path[0] = _FromTokenContractAddress;
path[1] = wethTokenAddress;
tokenBought = uniswapRouter.swapExactTokensForTokens(
tokens2Trade,
1,
path,
address(this),
deadline
)[path.length - 1];
}
} else {
address[] memory path = new address[](2);
path[0] = wethTokenAddress;
path[1] = _ToTokenContractAddress;
tokenBought = uniswapRouter.swapExactTokensForTokens(
tokens2Trade,
1,
path,
address(this),
deadline
)[path.length - 1];
}
require(tokenBought > minTokens, "ERR: High Slippage");
}
function _token2Eth(
address _FromTokenContractAddress,
uint256 tokens2Trade,
address payable _toWhomToIssue,
uint256 minTokens
) internal returns (uint256) {
if (_FromTokenContractAddress == wethTokenAddress) {
IWETH(wethTokenAddress).withdraw(tokens2Trade);
_toWhomToIssue.transfer(tokens2Trade);
return tokens2Trade;
}
IERC20(_FromTokenContractAddress).safeApprove(
address(uniswapRouter),
tokens2Trade
);
address[] memory path = new address[](2);
path[0] = _FromTokenContractAddress;
path[1] = wethTokenAddress;
uint256 ethBought = uniswapRouter.swapExactTokensForETH(
tokens2Trade,
1,
path,
_toWhomToIssue,
deadline
)[path.length - 1];
require(ethBought > minTokens, "Error: High Slippage");
return ethBought;
}
/**
@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 goodwillPortion The quantity of goodwill deducted
*/
function _transferGoodwill(
address _tokenContractAddress,
uint256 tokens2Trade
) internal returns (uint256 goodwillPortion) {
goodwillPortion = SafeMath.div(
SafeMath.mul(tokens2Trade, goodwill),
10000
);
if (goodwillPortion == 0) {
return 0;
}
IERC20(_tokenContractAddress).safeTransfer(
zgoodwillAddress,
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 inCaseTokengetsStuck(IERC20 _TokenAddress) public onlyOwner {
uint256 qty = _TokenAddress.balanceOf(address(this));
IERC20(address(_TokenAddress)).safeTransfer(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 = payable(owner());
_to.transfer(contractBalance);
}
}
{
"compilationTarget": {
"yVault_ZapInOut_General_V1_3.sol": "yVault_ZapInOut_General_V1_3"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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