diff --git a/contracts/VoltVote.sol b/contracts/VoltVote.sol new file mode 100644 index 0000000..ca58d3a --- /dev/null +++ b/contracts/VoltVote.sol @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: MIT +pragma solidity =0.6.12; + +import "@openzeppelin/contracts/math/SafeMath.sol"; +import "./interfaces/IBar.sol"; +import "./interfaces/IERC20.sol"; + +interface IMasterChef { + function userInfo(uint256 pid, address owner) external view returns (uint256, uint256); +} + +contract VoltVote { + using SafeMath for uint256; + + IBar bar; + IERC20 volt; + IMasterChef chef; + uint256 pid; // Pool ID of xVOLT in MasterChefV3 + + function name() public pure returns(string memory) { + return "VoltVote"; + } + + function symbol() public pure returns (string memory) { + return "VOLTVOTE"; + } + + function decimals() public pure returns (uint8) { + return 18; + } + + constructor( + address _bar, + address _volt, + address _chef, + uint256 _pid + ) public { + bar = IBar(_bar); + volt = IERC20(_volt); + chef = IMasterChef(_chef); + pid = _pid; + } + + function balanceOf(address owner) public view returns (uint256) { + (uint256 xvoltStakedBalance, ) = chef.userInfo(pid, owner); + uint256 xvoltStakedBalancePowah = xvoltStakedBalance.mul(150).div(100); + + uint256 xvoltBalance = bar.balanceOf(owner); + uint256 xvoltBalancePowah = xvoltBalance.mul(2); + + uint256 voltBalance = volt.balanceOf(owner); + + return xvoltStakedBalancePowah.add(xvoltBalancePowah).add(voltBalance); + } + + function allowance(address, address) public pure returns (uint256) { + return 0; + } + + function transfer(address, uint256) public pure returns (bool) { + return false; + } + + function approve(address, uint256) public pure returns (bool) { + return false; + } + + function transferFrom( + address, + address, + uint256 + ) public pure returns (bool) { + return false; + } +} diff --git a/contracts/fusd/FUSDMigration.sol b/contracts/fusd/FUSDMigration.sol new file mode 100644 index 0000000..8150a77 --- /dev/null +++ b/contracts/fusd/FUSDMigration.sol @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: MIT +pragma solidity =0.6.12; + +import "@openzeppelin/contracts/math/SafeMath.sol"; +import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; + +import "../interfaces/IPegswap.sol"; +import "../interfaces/IStablePool.sol"; +import "../interfaces/IFasset.sol"; + +contract FUSDMigration { + using SafeMath for uint256; + using SafeERC20 for IERC20; + + address public fusdV1; + address public fusdV2; + + address public constant usdc = 0x620fd5fa44BE6af63715Ef4E65DDFA0387aD13F5; + address public constant busd = 0x6a5F6A8121592BeCd6747a38d67451B310F7f156; + address public constant usdt = 0xFaDbBF8Ce7D5b7041bE672561bbA99f79c532e10; + IStablePool public stablePool = IStablePool(0x2a68D7C6Ea986fA06B2665d08b4D08F5e7aF960c); + IPegswap public pegswap = IPegswap(0xdfE016328E7BcD6FA06614fE3AF3877E931F7e0a); + + constructor( + address _fusdV1, + address _fusdV2 + ) public { + fusdV1 = _fusdV1; + fusdV2 = _fusdV2; + } + + function migrate(uint256 _amountIn) external { + _migrate(_amountIn); + } + + function outputAmount(uint256 _amountIn) public view returns (uint256) { + + } + + function _approveTokenIfNeeded(address token, address spender) private { + if (IERC20(token).allowance(address(this), spender) == 0) { + IERC20(token).safeApprove(spender, uint256(~0)); + } + } + + function _burn(uint256 _amountIn) private { + pegswap.swap(_amountIn, usdc, fusdV1); + } + + function _mint() private { + uint256 busdAmount = IERC20(busd).balanceOf(address(this)); + uint256 usdtAmount = IERC20(usdt).balanceOf(address(this)); + uint256 usdcAmount = IERC20(usdc).balanceOf(address(this)); + + _approveTokenIfNeeded(usdc, fusdV2); + _approveTokenIfNeeded(usdt, fusdV2); + _approveTokenIfNeeded(busd, fusdV2); + + address[] memory inputs = new address[](3); + inputs[0] = usdt; + inputs[1] = busd; + inputs[2] = usdc; + + uint256[] memory amounts = new uint256[](3); + amounts[0] = usdtAmount; + amounts[1] = busdAmount; + amounts[2] = usdcAmount; + + IFasset(fusdV2).mintMulti( + inputs, + amounts, + 0, + msg.sender + ); + } + + function _swap(address _from, address _to, uint256 _amountIn) private { + uint256 minAmountOut = stablePool.calculateSwap( + stablePool.getTokenIndex(_from), + stablePool.getTokenIndex(_to), + _amountIn + ); + + stablePool.swap( + stablePool.getTokenIndex(_from), + stablePool.getTokenIndex(_to), + _amountIn, + minAmountOut, + block.timestamp + 30000 + ); + } + + function _migrate(uint256 _amountIn) private { + IERC20(fusdV1).safeTransferFrom(msg.sender, address(this), _amountIn); + + _burn(_amountIn); + + uint256 usdcAmount = IERC20(usdc).balanceOf(address(this)); + uint256 usdcPortionAmount = usdcAmount.mul(33).div(100); + + _approveTokenIfNeeded(usdc, address(stablePool)); + + _swap(usdc, usdt, usdcPortionAmount); + _swap(usdc, busd, usdcPortionAmount); + + _mint(); + } +} \ No newline at end of file diff --git a/contracts/interfaces/IFasset.sol b/contracts/interfaces/IFasset.sol new file mode 100644 index 0000000..0f7dbc3 --- /dev/null +++ b/contracts/interfaces/IFasset.sol @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: MIT +pragma solidity 0.6.12; + +interface IFasset { + function mintMulti( + address[] calldata _inputs, + uint256[] calldata _inputQuantities, + uint256 _minOutputQuantity, + address _recipient + ) external returns (uint256 mintOutput); +} diff --git a/contracts/interfaces/IPegswap.sol b/contracts/interfaces/IPegswap.sol new file mode 100644 index 0000000..9c6f5e0 --- /dev/null +++ b/contracts/interfaces/IPegswap.sol @@ -0,0 +1,6 @@ +// SPDX-License-Identifier: MIT +pragma solidity 0.6.12; + +interface IPegswap { + function swap(uint256 sourceAmount, address source, address target) external; +} diff --git a/contracts/interfaces/IStablePool.sol b/contracts/interfaces/IStablePool.sol new file mode 100644 index 0000000..6a0e90e --- /dev/null +++ b/contracts/interfaces/IStablePool.sol @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: MIT +pragma solidity 0.6.12; + +interface IStablePool { + function getTokenIndex(address tokenAddress) external view returns (uint8); + + function calculateSwap( + uint8 tokenIndexFrom, + uint8 tokenIndexTo, + uint256 dx + ) external view returns (uint256); + + function swap( + uint8 tokenIndexFrom, + uint8 tokenIndexTo, + uint256 dx, + uint256 minDy, + uint256 deadline + ) external returns (uint256); +} diff --git a/flat/FUSDMigration_flat.sol b/flat/FUSDMigration_flat.sol new file mode 100644 index 0000000..64ac33b --- /dev/null +++ b/flat/FUSDMigration_flat.sol @@ -0,0 +1,711 @@ +// SPDX-License-Identifier: MIXED + +// File @openzeppelin/contracts/math/SafeMath.sol@v3.4.2 +// License-Identifier: MIT + +pragma solidity >=0.6.0 <0.8.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { + uint256 c = a + b; + if (c < a) return (false, 0); + return (true, c); + } + + /** + * @dev Returns the substraction of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b > a) return (false, 0); + return (true, a - b); + } + + /** + * @dev Returns the multiplication of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) return (true, 0); + uint256 c = a * b; + if (c / a != b) return (false, 0); + return (true, c); + } + + /** + * @dev Returns the division of two unsigned integers, with a division by zero flag. + * + * _Available since v3.4._ + */ + function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b == 0) return (false, 0); + return (true, a / b); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. + * + * _Available since v3.4._ + */ + function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b == 0) return (false, 0); + return (true, a % b); + } + + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + require(b <= a, "SafeMath: subtraction overflow"); + return a - b; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + if (a == 0) return 0; + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers, reverting on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + require(b > 0, "SafeMath: division by zero"); + return a / b; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * reverting when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + require(b > 0, "SafeMath: modulo by zero"); + return a % b; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {trySub}. + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + return a - b; + } + + /** + * @dev Returns the integer division of two unsigned integers, reverting with custom message on + * division by zero. The result is rounded towards zero. + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {tryDiv}. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + return a / b; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * reverting with custom message when dividing by zero. + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {tryMod}. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + return a % b; + } +} + +// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v3.4.2 +// License-Identifier: MIT + +pragma solidity >=0.6.0 <0.8.0; + +/** + * @dev Interface of the ERC20 standard as defined in the EIP. + */ +interface IERC20 { + /** + * @dev Returns the amount of tokens in existence. + */ + function totalSupply() external view returns (uint256); + + /** + * @dev Returns the amount of tokens owned by `account`. + */ + function balanceOf(address account) external view returns (uint256); + + /** + * @dev Moves `amount` tokens from the caller's account to `recipient`. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transfer(address recipient, uint256 amount) external returns (bool); + + /** + * @dev Returns the remaining number of tokens that `spender` will be + * allowed to spend on behalf of `owner` through {transferFrom}. This is + * zero by default. + * + * This value changes when {approve} or {transferFrom} are called. + */ + function allowance(address owner, address spender) external view returns (uint256); + + /** + * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * IMPORTANT: Beware that changing an allowance with this method brings the risk + * that someone may use both the old and the new allowance by unfortunate + * transaction ordering. One possible solution to mitigate this race + * condition is to first reduce the spender's allowance to 0 and set the + * desired value afterwards: + * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 + * + * Emits an {Approval} event. + */ + function approve(address spender, uint256 amount) external returns (bool); + + /** + * @dev Moves `amount` tokens from `sender` to `recipient` using the + * allowance mechanism. `amount` is then deducted from the caller's + * allowance. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); + + /** + * @dev Emitted when `value` tokens are moved from one account (`from`) to + * another (`to`). + * + * Note that `value` may be zero. + */ + event Transfer(address indexed from, address indexed to, uint256 value); + + /** + * @dev Emitted when the allowance of a `spender` for an `owner` is set by + * a call to {approve}. `value` is the new allowance. + */ + event Approval(address indexed owner, address indexed spender, uint256 value); +} + +// File @openzeppelin/contracts/utils/Address.sol@v3.4.2 +// License-Identifier: MIT + +pragma solidity >=0.6.2 <0.8.0; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // This method relies on extcodesize, which returns 0 for contracts in + // construction, since the code is only stored at the end of the + // constructor execution. + + uint256 size; + // solhint-disable-next-line no-inline-assembly + assembly { size := extcodesize(account) } + return size > 0; + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: value }(data); + return _verifyCallResult(success, returndata, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but performing a static call. + * + * _Available since v3.3._ + */ + function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { + return functionStaticCall(target, data, "Address: low-level static call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], + * but performing a static call. + * + * _Available since v3.3._ + */ + function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { + require(isContract(target), "Address: static call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.staticcall(data); + return _verifyCallResult(success, returndata, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but performing a delegate call. + * + * _Available since v3.4._ + */ + function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { + return functionDelegateCall(target, data, "Address: low-level delegate call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], + * but performing a delegate call. + * + * _Available since v3.4._ + */ + function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + require(isContract(target), "Address: delegate call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.delegatecall(data); + return _verifyCallResult(success, returndata, errorMessage); + } + + function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File @openzeppelin/contracts/token/ERC20/SafeERC20.sol@v3.4.2 +// License-Identifier: MIT + +pragma solidity >=0.6.0 <0.8.0; + + + +/** + * @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 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"); + } + } +} + +// File contracts/interfaces/IPegswap.sol +// License-Identifier: MIT +pragma solidity 0.6.12; + +interface IPegswap { + function swap(uint256 sourceAmount, address source, address target) external; +} + +// File contracts/interfaces/IStablePool.sol +// License-Identifier: MIT +pragma solidity 0.6.12; + +interface IStablePool { + function getTokenIndex(address tokenAddress) external view returns (uint8); + + function calculateSwap( + uint8 tokenIndexFrom, + uint8 tokenIndexTo, + uint256 dx + ) external view returns (uint256); + + function swap( + uint8 tokenIndexFrom, + uint8 tokenIndexTo, + uint256 dx, + uint256 minDy, + uint256 deadline + ) external returns (uint256); +} + +// File contracts/interfaces/IFasset.sol +// License-Identifier: MIT +pragma solidity 0.6.12; + +interface IFasset { + function mintMulti( + address[] calldata _inputs, + uint256[] calldata _inputQuantities, + uint256 _minOutputQuantity, + address _recipient + ) external returns (uint256 mintOutput); +} + +// File contracts/fusd/FUSDMigration.sol +// License-Identifier: MIT +pragma solidity =0.6.12; + + + + +contract FUSDMigration { + using SafeMath for uint256; + using SafeERC20 for IERC20; + + address public fusdV1; + address public fusdV2; + + address public constant usdc = 0x620fd5fa44BE6af63715Ef4E65DDFA0387aD13F5; + address public constant busd = 0x6a5F6A8121592BeCd6747a38d67451B310F7f156; + address public constant usdt = 0xFaDbBF8Ce7D5b7041bE672561bbA99f79c532e10; + IStablePool public stablePool = IStablePool(0x2a68D7C6Ea986fA06B2665d08b4D08F5e7aF960c); + IPegswap public pegswap = IPegswap(0xdfE016328E7BcD6FA06614fE3AF3877E931F7e0a); + + constructor( + address _fusdV1, + address _fusdV2 + ) public { + fusdV1 = _fusdV1; + fusdV2 = _fusdV2; + } + + function migrate(uint256 _amountIn) external { + _migrate(_amountIn); + } + + function outputAmount(uint256 _amountIn) public view returns (uint256) { + + } + + function _approveTokenIfNeeded(address token, address spender) private { + if (IERC20(token).allowance(address(this), spender) == 0) { + IERC20(token).safeApprove(spender, uint256(~0)); + } + } + + function _burn(uint256 _amountIn) private { + pegswap.swap(_amountIn, usdc, fusdV1); + } + + function _mint() private { + uint256 busdAmount = IERC20(busd).balanceOf(address(this)); + uint256 usdtAmount = IERC20(usdt).balanceOf(address(this)); + uint256 usdcAmount = IERC20(usdc).balanceOf(address(this)); + + _approveTokenIfNeeded(usdc, fusdV2); + _approveTokenIfNeeded(usdt, fusdV2); + _approveTokenIfNeeded(busd, fusdV2); + + address[] memory inputs = new address[](3); + inputs[0] = usdt; + inputs[1] = busd; + inputs[2] = usdc; + + uint256[] memory amounts = new uint256[](3); + amounts[0] = usdtAmount; + amounts[1] = busdAmount; + amounts[2] = usdcAmount; + + IFasset(fusdV2).mintMulti( + inputs, + amounts, + 0, + msg.sender + ); + } + + function _swap(address _from, address _to, uint256 _amountIn) private { + uint256 minAmountOut = stablePool.calculateSwap( + stablePool.getTokenIndex(_from), + stablePool.getTokenIndex(_to), + _amountIn + ); + + stablePool.swap( + stablePool.getTokenIndex(_from), + stablePool.getTokenIndex(_to), + _amountIn, + minAmountOut, + block.timestamp + 30000 + ); + } + + function _migrate(uint256 _amountIn) private { + IERC20(fusdV1).safeTransferFrom(msg.sender, address(this), _amountIn); + + _burn(_amountIn); + + uint256 usdcAmount = IERC20(usdc).balanceOf(address(this)); + uint256 usdcPortionAmount = usdcAmount.mul(33).div(100); + + _approveTokenIfNeeded(usdc, address(stablePool)); + + _swap(usdc, usdt, usdcPortionAmount); + _swap(usdc, busd, usdcPortionAmount); + + _mint(); + } +} \ No newline at end of file diff --git a/flat/VoltVote_flat.sol b/flat/VoltVote_flat.sol new file mode 100644 index 0000000..c61f419 --- /dev/null +++ b/flat/VoltVote_flat.sol @@ -0,0 +1,330 @@ +// SPDX-License-Identifier: MIXED + +// File @openzeppelin/contracts/math/SafeMath.sol@v3.4.2 +// License-Identifier: MIT + +pragma solidity >=0.6.0 <0.8.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { + uint256 c = a + b; + if (c < a) return (false, 0); + return (true, c); + } + + /** + * @dev Returns the substraction of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b > a) return (false, 0); + return (true, a - b); + } + + /** + * @dev Returns the multiplication of two unsigned integers, with an overflow flag. + * + * _Available since v3.4._ + */ + function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) return (true, 0); + uint256 c = a * b; + if (c / a != b) return (false, 0); + return (true, c); + } + + /** + * @dev Returns the division of two unsigned integers, with a division by zero flag. + * + * _Available since v3.4._ + */ + function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b == 0) return (false, 0); + return (true, a / b); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. + * + * _Available since v3.4._ + */ + function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { + if (b == 0) return (false, 0); + return (true, a % b); + } + + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + require(b <= a, "SafeMath: subtraction overflow"); + return a - b; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + if (a == 0) return 0; + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers, reverting on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + require(b > 0, "SafeMath: division by zero"); + return a / b; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * reverting when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + require(b > 0, "SafeMath: modulo by zero"); + return a % b; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {trySub}. + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + return a - b; + } + + /** + * @dev Returns the integer division of two unsigned integers, reverting with custom message on + * division by zero. The result is rounded towards zero. + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {tryDiv}. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + return a / b; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * reverting with custom message when dividing by zero. + * + * CAUTION: This function is deprecated because it requires allocating memory for the error + * message unnecessarily. For custom revert reasons use {tryMod}. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + return a % b; + } +} + +// File contracts/interfaces/IBar.sol +// License-Identifier: MIT +pragma solidity 0.6.12; + +interface IBar { + function totalSupply() external view returns (uint256); + + function balanceOf(address account) external view returns (uint256); +} + +// File contracts/interfaces/IERC20.sol +// License-Identifier: MIT +pragma solidity 0.6.12; + +interface IERC20 { + function totalSupply() external view returns (uint256); + + function balanceOf(address account) external view returns (uint256); + + function allowance(address owner, address spender) external view returns (uint256); + + function approve(address spender, uint256 amount) external returns (bool); + + event Transfer(address indexed from, address indexed to, uint256 value); + event Approval(address indexed owner, address indexed spender, uint256 value); + + // EIP 2612 + function permit( + address owner, + address spender, + uint256 value, + uint256 deadline, + uint8 v, + bytes32 r, + bytes32 s + ) external; +} + +// File contracts/VoltVote.sol +// License-Identifier: MIT +pragma solidity =0.6.12; + + + +interface IMasterChef { + function userInfo(uint256 pid, address owner) external view returns (uint256, uint256); +} + +contract VoltVote { + using SafeMath for uint256; + + IBar bar; + IERC20 volt; + IMasterChef chef; + uint256 pid; // Pool ID of xVOLT in MasterChefV3 + + function name() public pure returns(string memory) { + return "VoltVote"; + } + + function symbol() public pure returns (string memory) { + return "VOLTVOTE"; + } + + function decimals() public pure returns (uint8) { + return 18; + } + + constructor( + address _bar, + address _volt, + address _chef, + uint256 _pid + ) public { + bar = IBar(_bar); + volt = IERC20(_volt); + chef = IMasterChef(_chef); + pid = _pid; + } + + function balanceOf(address owner) public view returns (uint256) { + (uint256 xvoltStakedBalance, ) = chef.userInfo(pid, owner); + uint256 xvoltStakedBalancePowah = xvoltStakedBalance.mul(150).div(100); + + uint256 xvoltBalance = bar.balanceOf(owner); + uint256 xvoltBalancePowah = xvoltBalance.mul(2); + + uint256 voltBalance = volt.balanceOf(owner); + + return xvoltStakedBalancePowah.add(xvoltBalancePowah).add(voltBalance); + } + + function allowance(address, address) public pure returns (uint256) { + return 0; + } + + function transfer(address, uint256) public pure returns (bool) { + return false; + } + + function approve(address, uint256) public pure returns (bool) { + return false; + } + + function transferFrom( + address, + address, + uint256 + ) public pure returns (bool) { + return false; + } +} \ No newline at end of file