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April 15, 2020 21:08
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// File: browser/OpenZepplinIERC20.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: browser/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: browser/OpenZepplinOwnable.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 payable public _owner; | |
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); | |
/** | |
* @dev Initializes the contract setting the deployer as the initial owner. | |
*/ | |
constructor () internal { | |
address payable 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 payable newOwner) public onlyOwner { | |
_transferOwnership(newOwner); | |
} | |
/** | |
* @dev Transfers ownership of the contract to a new account (`newOwner`). | |
*/ | |
function _transferOwnership(address payable newOwner) internal { | |
require(newOwner != address(0), "Ownable: new owner is the zero address"); | |
emit OwnershipTransferred(_owner, newOwner); | |
_owner = newOwner; | |
} | |
} | |
// File: browser/OpenZepplinSafeMath.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: browser/OpenZepplinReentrancyGuard.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. | |
* | |
* _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: browser/Unipool_yCurve_Bridge_Zap_v1_1.sol | |
// Copyright (C) 2019, 2020 dipeshsukhani, nodarjanashia, suhailg | |
// 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 | |
// File: localhost/defizap/node_modules/@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol | |
///@author DeFiZap | |
///@notice this contract implements one click swapping among Uniswap Pools | |
// interface | |
interface yCurveExchange_Unipool_yCurve_Bridge_Zap_V1 { | |
function add_liquidity_underlying( | |
uint256[5] calldata amounts, | |
uint256 min_mint_amount | |
) external; | |
function calc_deposit_amount(uint256[5] calldata amounts) | |
external | |
view | |
returns (uint256); | |
} | |
interface IuniswapFactory_Unipool_yCurve_Bridge_Zap_V1 { | |
function getExchange(address token) | |
external | |
view | |
returns (address exchange); | |
} | |
interface Iuniswap_Unipool_yCurve_Bridge_Zap_V1 { | |
// for removing liquidity (returns ETH removed, ERC20 Removed) | |
function removeLiquidity( | |
uint256 amount, | |
uint256 min_eth, | |
uint256 min_tokens, | |
uint256 deadline | |
) external returns (uint256, uint256); | |
// converting ERC20 to ERC20 and transfer | |
function tokenToTokenSwapInput( | |
uint256 tokens_sold, | |
uint256 min_tokens_bought, | |
uint256 min_eth_bought, | |
uint256 deadline, | |
address token_addr | |
) external returns (uint256 tokens_bought); | |
// add liquidity to a pool (returns LP tokens rec) | |
function addLiquidity( | |
uint256 min_liquidity, | |
uint256 max_tokens, | |
uint256 deadline | |
) external payable returns (uint256); | |
function getEthToTokenInputPrice(uint256 eth_sold) | |
external | |
view | |
returns (uint256 tokens_bought); | |
function getTokenToEthInputPrice(uint256 tokens_sold) | |
external | |
view | |
returns (uint256 eth_bought); | |
function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) | |
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); | |
} | |
pragma solidity ^0.5.13; | |
contract Unipool_yCurve_Bridge_Zap_V1 is ReentrancyGuard, Ownable { | |
using SafeMath for uint256; | |
bool private stopped = false; | |
uint16 public goodwill; | |
address public dzgoodwillAddress; | |
IuniswapFactory_Unipool_yCurve_Bridge_Zap_V1 public UniSwapFactoryAddress = IuniswapFactory_Unipool_yCurve_Bridge_Zap_V1( | |
0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95 | |
); | |
address public DaiTokenAddress = address( | |
0x6B175474E89094C44Da98b954EedeAC495271d0F | |
); | |
address public UsdcTokenAddress = address( | |
0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 | |
); | |
address public yCurveExchangeAddress = address( | |
0x3b12e1fBb468BEa80B492d635976809Bf950186C | |
); | |
address public sUSDyCurveAddress = address( | |
0x2b645a6A426f22fB7954dC15E583e3737B8d1434 | |
); | |
constructor(uint16 _goodwill, address _dzgoodwillAddress) public { | |
goodwill = _goodwill; | |
dzgoodwillAddress = _dzgoodwillAddress; | |
approveToken(); | |
} | |
// circuit breaker modifiers | |
modifier stopInEmergency { | |
if (stopped) { | |
revert("Temporarily Paused"); | |
} else { | |
_; | |
} | |
} | |
function approveToken() public { | |
IERC20(DaiTokenAddress).approve(yCurveExchangeAddress, uint256(-1)); | |
IERC20(UsdcTokenAddress).approve(yCurveExchangeAddress, uint256(-1)); | |
} | |
function LetsBridge( | |
address _toWhomToIssue, | |
address _FromTokenContractAddress, | |
uint256 _IncomingLP | |
) public payable nonReentrant stopInEmergency returns (bool) { | |
uint256 goodwillPortion = SafeMath.div( | |
SafeMath.mul(_IncomingLP, goodwill), | |
10000 | |
); | |
(uint256 ethReceived, uint256 erc20received) = _exitFromPool( | |
_IncomingLP, | |
goodwillPortion, | |
_FromTokenContractAddress | |
); | |
uint256 daiBought; | |
uint256 usdcBought; | |
if (_FromTokenContractAddress == DaiTokenAddress) { | |
usdcBought = _eth2Token(UsdcTokenAddress, ethReceived); | |
daiBought = erc20received; | |
} else if (_FromTokenContractAddress == UsdcTokenAddress) { | |
daiBought = _eth2Token(DaiTokenAddress, ethReceived); | |
usdcBought = erc20received; | |
} else { | |
daiBought = _eth2Token(DaiTokenAddress, ethReceived); | |
usdcBought = _token2Token( | |
_FromTokenContractAddress, | |
UsdcTokenAddress, | |
erc20received | |
); | |
} | |
uint256 crvTokensBought = _enter2Curve(daiBought, usdcBought); | |
require( | |
IERC20(sUSDyCurveAddress).transfer(_toWhomToIssue, crvTokensBought), | |
"Error transferring CRV" | |
); | |
return true; | |
} | |
function _enter2Curve(uint256 daiBought, uint256 usdcBought) | |
internal | |
returns (uint256 crvTokensBought) | |
{ | |
yCurveExchange_Unipool_yCurve_Bridge_Zap_V1 yCurveExchange | |
= yCurveExchange_Unipool_yCurve_Bridge_Zap_V1(yCurveExchangeAddress); | |
// 0 = DAI, 1 = USDC, 2 = USDT, 3 = TUSD, 4 = SUSD | |
uint256 depositAmount = yCurveExchange.calc_deposit_amount( | |
[daiBought, usdcBought, 0, 0, 0] | |
); | |
yCurveExchange.add_liquidity_underlying( | |
[daiBought, usdcBought, 0, 0, 0], | |
depositAmount | |
); | |
crvTokensBought = IERC20(sUSDyCurveAddress).balanceOf(address(this)); | |
require(crvTokensBought > 0, "Error swapping to CRV"); | |
} | |
function _token2Token( | |
address _FromTokenContractAddress, | |
address _ToTokenContractAddress, | |
uint256 tokens2Trade | |
) internal returns (uint256 tokensBought) { | |
Iuniswap_Unipool_yCurve_Bridge_Zap_V1 FromUniSwapExchangeContractAddress | |
= Iuniswap_Unipool_yCurve_Bridge_Zap_V1( | |
UniSwapFactoryAddress.getExchange(_FromTokenContractAddress) | |
); | |
IERC20(_FromTokenContractAddress).approve( | |
address(FromUniSwapExchangeContractAddress), | |
tokens2Trade | |
); | |
tokensBought = FromUniSwapExchangeContractAddress.tokenToTokenSwapInput( | |
tokens2Trade, | |
1, | |
1, | |
SafeMath.add(now, 1800), | |
_ToTokenContractAddress | |
); | |
require(tokensBought > 0, "Error in swapping ERC"); | |
} | |
function _eth2Token(address _ToTokenContractAddress, uint256 ethReceived) | |
internal | |
returns (uint256 tokensBought) | |
{ | |
Iuniswap_Unipool_yCurve_Bridge_Zap_V1 ToUniSwapExchangeContractAddress | |
= Iuniswap_Unipool_yCurve_Bridge_Zap_V1( | |
UniSwapFactoryAddress.getExchange(_ToTokenContractAddress) | |
); | |
tokensBought = ToUniSwapExchangeContractAddress | |
.ethToTokenSwapInput | |
.value(ethReceived)(1, SafeMath.add(now, 1800)); | |
require(tokensBought > 0, "Error in swapping ETH"); | |
} | |
function _exitFromPool( | |
uint256 _IncomingLP, | |
uint256 goodwillPortion, | |
address _FromTokenContractAddress | |
) internal returns (uint256 ethReceived, uint256 erc20received) { | |
Iuniswap_Unipool_yCurve_Bridge_Zap_V1 FromUniSwapExchangeContractAddress | |
= Iuniswap_Unipool_yCurve_Bridge_Zap_V1( | |
UniSwapFactoryAddress.getExchange(_FromTokenContractAddress) | |
); | |
require( | |
FromUniSwapExchangeContractAddress.transferFrom( | |
msg.sender, | |
address(this), | |
SafeMath.sub(_IncomingLP, goodwillPortion) | |
), | |
"Error in transferring LP:1" | |
); | |
require( | |
FromUniSwapExchangeContractAddress.transferFrom( | |
msg.sender, | |
dzgoodwillAddress, | |
goodwillPortion | |
), | |
"Error in transferring LP:2" | |
); | |
(ethReceived, erc20received) = FromUniSwapExchangeContractAddress | |
.removeLiquidity( | |
SafeMath.sub(_IncomingLP, goodwillPortion), | |
1, | |
1, | |
SafeMath.add(now, 1800) | |
); | |
} | |
function inCaseTokengetsStuck(IERC20 _TokenAddress) public onlyOwner { | |
uint256 qty = _TokenAddress.balanceOf(address(this)); | |
_TokenAddress.transfer(_owner, qty); | |
} | |
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; | |
} | |
// - to Pause the contract | |
function toggleContractActive() public onlyOwner { | |
stopped = !stopped; | |
} | |
// - to withdraw any ETH balance sitting in the contract | |
function withdraw() public onlyOwner { | |
_owner.transfer(address(this).balance); | |
} | |
// - to kill the contract | |
function destruct() public onlyOwner { | |
selfdestruct(_owner); | |
} | |
function() external payable {} | |
} |
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