{"file_path":"./contracts/core/YapeFactory.sol","creation_status":"success","source_code":"// SPDX-License-Identifier: GPL-3.0-or-later\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {IUniswapV2Pair} from \"../helpers/uni-v2/interfaces/IUniswapV2Pair.sol\";\nimport {UniswapV2Factory} from \"../helpers/uni-v2/UniswapV2Factory.sol\";\nimport {IYapePair} from \"../interfaces/IYapePair.sol\";\nimport {YapePairCode} from \"./YapePairCode.sol\";\n\ncontract YapeFactory is UniswapV2Factory {\n address public registry;\n address public operator;\n address public pairCode;\n\n constructor(\n address feeToSetter_,\n address registry_,\n address operator_,\n address pairCode_\n ) UniswapV2Factory(feeToSetter_) {\n registry = registry_;\n operator = operator_;\n pairCode = pairCode_;\n }\n\n function setRegistry(address registry_) external {\n require(msg.sender == feeToSetter, \"UniswapV2: FORBIDDEN\");\n registry = registry_;\n }\n\n function setOperator(address operator_) external {\n require(msg.sender == feeToSetter, \"UniswapV2: FORBIDDEN\");\n operator = operator_;\n }\n\n function createPair(address tokenA, address tokenB)\n external\n override\n returns (address pair)\n {\n require(tokenA != tokenB, \"Yapeswap: IDENTICAL_ADDRESSES\");\n (address token0, address token1) = tokenA < tokenB\n ? (tokenA, tokenB)\n : (tokenB, tokenA);\n require(token0 != address(0), \"Yapeswap: ZERO_ADDRESS\");\n require(getPair[token0][token1] == address(0), \"Yapeswap: PAIR_EXISTS\"); // single check is sufficient\n bytes memory bytecode = YapePairCode(pairCode).getCreationCode();\n bytes32 salt = keccak256(abi.encodePacked(token0, token1));\n assembly {\n pair := create2(0, add(bytecode, 32), mload(bytecode), salt)\n }\n IYapePair(pair).initialize(token0, token1);\n IYapePair(pair).updateRegistry();\n getPair[token0][token1] = pair;\n getPair[token1][token0] = pair; // populate mapping in the reverse direction\n allPairs.push(pair);\n emit PairCreated(token0, token1, pair, allPairs.length);\n 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"can_be_visualized_via_sol2uml":true,"is_verified_via_sourcify":false,"additional_sources":[{"file_path":"./contracts/core/YapePair.sol","source_code":"// SPDX-License-Identifier: GPL-3.0-or-later\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\nimport {Math} from \"@openzeppelin/contracts/utils/math/Math.sol\";\nimport {SafeERC20} from \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport {IERC20} from \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport {UniswapV2Pair} from \"../helpers/uni-v2/UniswapV2Pair.sol\";\nimport {IUniswapV2Factory} from \"../helpers/uni-v2/interfaces/IUniswapV2Factory.sol\";\nimport {UQ112x112} from \"../helpers/uni-v2/libraries/UQ112x112.sol\";\nimport {RegistryAPI} from \"../helpers/yearn/BaseWrapper.sol\";\nimport {YapeWrapper} from \"./YapeWrapper.sol\";\nimport {IYapePair} from \"../interfaces/IYapePair.sol\";\nimport {IYapeFactory} from \"../interfaces/IYapeFactory.sol\";\n\ncontract YapePair is UniswapV2Pair, YapeWrapper {\n using SafeMath for uint256;\n using SafeERC20 for IERC20;\n using UQ112x112 for uint224;\n\n mapping(address => uint256) public farming;\n\n uint256 private _minFarming;\n uint256 private _maxFarming;\n address private _registry;\n uint256 private constant DENOMINATOR = 10000;\n\n event YearnDeposit(address token, uint256 amount);\n event YearnWithdraw(address token, uint256 amount, uint256 yield);\n\n modifier onlyOperator() {\n require(msg.sender == IYapeFactory(factory).operator());\n _;\n }\n\n modifier onlyReserved(address token) {\n require(\n token == token0 || token == token1,\n \"Yapeswap: NOT A RESERVED TOKEN\"\n );\n _;\n }\n\n modifier keepBalance(address token) {\n uint256 prevBal = _balanceOf(token);\n _;\n require(_balanceOf(token) == prevBal, \"Yapeswap: BALANCE CHANGED\");\n }\n\n function mint(address to) public override returns (uint256 liquidity) {\n liquidity = super.mint(to);\n _rebalance(token0, 0, false);\n _rebalance(token1, 0, false);\n }\n\n function updateRegistry() public {\n _registry = IYapeFactory(factory).registry();\n }\n\n function setFarmingRatio(uint256 min, uint256 max) external onlyOperator {\n require(max <= DENOMINATOR);\n require(min <= max);\n _minFarming = min;\n _maxFarming = max;\n }\n\n /**\n * @param token use token0 or token1\n * @param amount use type(uint256).max (when you want to migrate all)\n * @param maxMigrationLoss use 0 for the default value\n */\n function migrate(\n address token,\n uint256 amount,\n uint256 maxMigrationLoss\n ) external onlyOperator onlyReserved(token) returns (uint256) {\n return _migrate(token, address(this), amount, maxMigrationLoss);\n }\n\n function rebalance(address token) external onlyReserved(token) {\n _rebalance(token, 0, true);\n }\n\n function registry() public view override returns (RegistryAPI) {\n return RegistryAPI(_registry);\n }\n\n function farmingRatio() public view returns (uint256 min, uint256 max) {\n return (_minFarming, _maxFarming);\n }\n\n function name() public view override returns (string memory) {\n return \"Yape LP\";\n }\n\n function symbol() public view override returns (string memory) {\n return \"YLP\";\n }\n\n function _balanceOf(address token)\n internal\n view\n override\n returns (uint256)\n {\n return IERC20(token).balanceOf(address(this)).add(farming[token]);\n }\n\n function _safeTransfer(\n address token,\n address to,\n uint256 value\n ) internal override {\n _rebalance(token, value, false);\n (bool success, bytes memory data) = token.call(\n abi.encodeWithSelector(SELECTOR, to, value)\n );\n require(\n success && (data.length == 0 || abi.decode(data, (bool))),\n \"UniswapV2: TRANSFER_FAILED\"\n );\n }\n\n function _rebalance(\n address token,\n uint256 amountOut,\n bool force\n ) internal {\n uint256 newBal = _balanceOf(token).sub(amountOut);\n uint256 minFarming = newBal.mul(_minFarming).div(DENOMINATOR);\n uint256 maxFarming = newBal.mul(_maxFarming).div(DENOMINATOR);\n uint256 currentFarming = farming[token];\n uint256 avg = Math.average(minFarming, maxFarming);\n if (currentFarming > maxFarming || (force && currentFarming > avg)) {\n // should withdraw from Yearn\n _fromYearn(token, currentFarming - avg);\n } else if (\n minFarming > currentFarming || (force && avg > currentFarming)\n ) {\n // should deposit to Yearn\n _toYearn(token, avg - currentFarming);\n }\n }\n\n function _toYearn(address token, uint256 amount)\n internal\n keepBalance(token)\n {\n uint256 deposited = _deposit(\n token,\n address(this),\n address(this),\n amount,\n false\n );\n farming[token] = farming[token].add(deposited);\n emit YearnDeposit(token, amount);\n }\n\n function _fromYearn(address token, uint256 amount)\n internal\n keepBalance(token)\n {\n uint256 yearnBal = totalVaultBalance(token, address(this));\n uint256 farmingAmount = farming[token];\n uint256 yield;\n if (yearnBal > farmingAmount) {\n yield = yearnBal - farmingAmount;\n } else {\n // rare case\n yield = 0;\n }\n uint256 withdrawn = _withdraw(\n token,\n address(this),\n address(this),\n amount.add(yield),\n true\n );\n uint256 netYield;\n if (withdrawn > amount) {\n netYield = withdrawn - amount;\n } else {\n netYield = 0;\n }\n farming[token] = farmingAmount.sub(withdrawn - netYield);\n // Send fee\n address feeTo = IUniswapV2Factory(factory).feeTo();\n if (netYield > 0) {\n IERC20(token).safeTransfer(feeTo, netYield);\n }\n emit YearnWithdraw(token, withdrawn, netYield);\n }\n}\n"},{"file_path":"./contracts/core/YapePairCode.sol","source_code":"// SPDX-License-Identifier: GPL-3.0-or-later\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {YapePair} from \"./YapePair.sol\";\n\ncontract YapePairCode {\n function getCreationCode() public pure returns (bytes memory) {\n return type(YapePair).creationCode;\n }\n}\n"},{"file_path":"./contracts/core/YapeWrapper.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {IERC20} from \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport {SafeERC20} from \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport {Math} from \"@openzeppelin/contracts/utils/math/Math.sol\";\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\nimport {VaultAPI} from \"../helpers/yearn/BaseStrategy.sol\";\nimport {RegistryAPI} from \"../helpers/yearn/BaseWrapper.sol\";\n\n/**\n * @title Functional Wrapper\n * @author yapeswap\n * @notice\n * YapeWrapper is a fork of Yearn Finance's BaseWrapper not to store the token address as\n * the state variable.\n *\n */\nabstract contract YapeWrapper {\n using SafeERC20 for IERC20;\n using Math for uint256;\n using SafeMath for uint256;\n\n // Reduce number of external calls (SLOADs stay the same)\n mapping(address => VaultAPI[]) private _cachedVaults;\n\n // ERC20 Unlimited Approvals (short-circuits VaultAPI.transferFrom)\n uint256 constant UNLIMITED_APPROVAL = type(uint256).max;\n // Sentinal values used to save gas on deposit/withdraw/migrate\n // NOTE: DEPOSIT_EVERYTHING == WITHDRAW_EVERYTHING == MIGRATE_EVERYTHING\n uint256 constant DEPOSIT_EVERYTHING = type(uint256).max;\n uint256 constant WITHDRAW_EVERYTHING = type(uint256).max;\n uint256 constant MIGRATE_EVERYTHING = type(uint256).max;\n // VaultsAPI.depositLimit is unlimited\n uint256 constant UNCAPPED_DEPOSITS = type(uint256).max;\n\n /**\n * @notice\n * Used to get the most revent vault for the token using the registry.\n * @return An instance of a VaultAPI\n */\n function bestVault(address token) public view virtual returns (VaultAPI) {\n return VaultAPI(registry().latestVault(token));\n }\n\n /**\n * @notice\n * Used to get all vaults from the registery for the token\n * @return An array containing instances of VaultAPI\n */\n function allVaults(address token)\n public\n view\n virtual\n returns (VaultAPI[] memory)\n {\n uint256 cache_length = _cachedVaults[token].length;\n uint256 num_vaults = registry().numVaults(token);\n\n // Use cached\n if (cache_length == num_vaults) {\n return _cachedVaults[token];\n }\n\n VaultAPI[] memory vaults = new VaultAPI[](num_vaults);\n\n for (uint256 vault_id = 0; vault_id < cache_length; vault_id++) {\n vaults[vault_id] = _cachedVaults[token][vault_id];\n }\n\n for (\n uint256 vault_id = cache_length;\n vault_id < num_vaults;\n vault_id++\n ) {\n vaults[vault_id] = VaultAPI(registry().vaults(token, vault_id));\n }\n\n return vaults;\n }\n\n function _updateVaultCache(address token, VaultAPI[] memory vaults)\n internal\n {\n // NOTE: even though `registry` is update-able by Yearn, the intended behavior\n // is that any future upgrades to the registry will replay the version\n // history so that this cached value does not get out of date.\n if (vaults.length > _cachedVaults[token].length) {\n _cachedVaults[token] = vaults;\n }\n }\n\n /**\n * @notice\n * Used to get the balance of an account accross all the vaults for a token.\n * @dev will be used to get the wrapper balance using totalVaultBalance(address(this)).\n * @param account The address of the account.\n * @return balance of token for the account accross all the vaults.\n */\n function totalVaultBalance(address token, address account)\n public\n view\n returns (uint256 balance)\n {\n VaultAPI[] memory vaults = allVaults(token);\n\n for (uint256 id = 0; id < vaults.length; id++) {\n balance = balance.add(\n vaults[id]\n .balanceOf(account)\n .mul(vaults[id].pricePerShare())\n .div(10**uint256(vaults[id].decimals()))\n );\n }\n }\n\n /**\n * @notice\n * Used to get the TVL on the underlying vaults.\n * @return assets the sum of all the assets managed by the underlying vaults.\n */\n function totalAssets(address token) public view returns (uint256 assets) {\n VaultAPI[] memory vaults = allVaults(token);\n\n for (uint256 id = 0; id < vaults.length; id++) {\n assets = assets.add(vaults[id].totalAssets());\n }\n }\n\n function _deposit(\n address token,\n address depositor,\n address receiver,\n uint256 amount, // if `MAX_UINT256`, just deposit everything\n bool pullFunds // If true, funds need to be pulled from `depositor` via `transferFrom`\n ) internal returns (uint256 deposited) {\n VaultAPI _bestVault = bestVault(token);\n // in case there does not exist yearn vault\n if (address(_bestVault) == address(0)) return 0;\n\n IERC20 _token = IERC20(token);\n\n if (pullFunds) {\n if (amount != DEPOSIT_EVERYTHING) {\n _token.safeTransferFrom(depositor, address(this), amount);\n } else {\n _token.safeTransferFrom(\n depositor,\n address(this),\n _token.balanceOf(depositor)\n );\n }\n }\n\n if (_token.allowance(address(this), address(_bestVault)) < amount) {\n _token.safeApprove(address(_bestVault), 0); // Avoid issues with some tokens requiring 0\n _token.safeApprove(address(_bestVault), UNLIMITED_APPROVAL); // Vaults are trusted\n }\n\n // Depositing returns number of shares deposited\n // NOTE: Shortcut here is assuming the number of tokens deposited is equal to the\n // number of shares credited, which helps avoid an occasional multiplication\n // overflow if trying to adjust the number of shares by the share price.\n uint256 beforeBal = _token.balanceOf(address(this));\n if (receiver != address(this)) {\n _bestVault.deposit(amount, receiver);\n } else if (amount != DEPOSIT_EVERYTHING) {\n _bestVault.deposit(amount);\n } else {\n _bestVault.deposit();\n }\n\n uint256 afterBal = _token.balanceOf(address(this));\n deposited = beforeBal.sub(afterBal);\n // `receiver` now has shares of `_bestVault` as balance, converted to `token` here\n // Issue a refund if not everything was deposited\n if (depositor != address(this) && afterBal > 0)\n _token.safeTransfer(depositor, afterBal);\n }\n\n function _withdraw(\n address token,\n address sender,\n address receiver,\n uint256 amount, // if `MAX_UINT256`, just withdraw everything\n bool withdrawFromBest // If true, also withdraw from `_bestVault`\n ) internal returns (uint256 withdrawn) {\n VaultAPI _bestVault = bestVault(token);\n IERC20 _token = IERC20(token);\n\n VaultAPI[] memory vaults = allVaults(token);\n _updateVaultCache(address(token), vaults);\n\n // NOTE: This loop will attempt to withdraw from each Vault in `allVaults` that `sender`\n // is deposited in, up to `amount` tokens. The withdraw action can be expensive,\n // so it if there is a denial of service issue in withdrawing, the downstream usage\n // of this wrapper contract must give an alternative method of withdrawing using\n // this function so that `amount` is less than the full amount requested to withdraw\n // (e.g. \"piece-wise withdrawals\"), leading to less loop iterations such that the\n // DoS issue is mitigated (at a tradeoff of requiring more txns from the end user).\n for (uint256 id = 0; id < vaults.length; id++) {\n if (!withdrawFromBest && vaults[id] == _bestVault) {\n continue; // Don't withdraw from the best\n }\n\n // Start with the total shares that `sender` has\n uint256 availableShares = vaults[id].balanceOf(sender);\n\n // Restrict by the allowance that `sender` has to this contract\n // NOTE: No need for allowance check if `sender` is this contract\n if (sender != address(this)) {\n availableShares = Math.min(\n availableShares,\n vaults[id].allowance(sender, address(this))\n );\n }\n\n // Limit by maximum withdrawal size from each vault\n availableShares = Math.min(\n availableShares,\n vaults[id].maxAvailableShares()\n );\n\n if (availableShares > 0) {\n // Intermediate step to move shares to this contract before withdrawing\n // NOTE: No need for share transfer if this contract is `sender`\n if (sender != address(this))\n vaults[id].transferFrom(\n sender,\n address(this),\n availableShares\n );\n\n if (amount != WITHDRAW_EVERYTHING) {\n // Compute amount to withdraw fully to satisfy the request\n uint256 estimatedShares = amount\n .sub(withdrawn) // NOTE: Changes every iteration\n .mul(10**uint256(vaults[id].decimals()))\n .div(vaults[id].pricePerShare()); // NOTE: Every Vault is different\n\n // Limit amount to withdraw to the maximum made available to this contract\n // NOTE: Avoid corner case where `estimatedShares` isn't precise enough\n // NOTE: If `0 < estimatedShares < 1` but `availableShares > 1`, this will withdraw more than necessary\n if (\n estimatedShares > 0 && estimatedShares < availableShares\n ) {\n withdrawn = withdrawn.add(\n vaults[id].withdraw(estimatedShares)\n );\n } else {\n withdrawn = withdrawn.add(\n vaults[id].withdraw(availableShares)\n );\n }\n } else {\n withdrawn = withdrawn.add(vaults[id].withdraw());\n }\n\n // Check if we have fully satisfied the request\n // NOTE: use `amount = WITHDRAW_EVERYTHING` for withdrawing everything\n if (amount <= withdrawn) break; // withdrawn as much as we needed\n }\n }\n\n // If we have extra, deposit back into `_bestVault` for `sender`\n // NOTE: Invariant is `withdrawn <= amount`\n if (\n withdrawn > amount &&\n withdrawn.sub(amount) >\n _bestVault.pricePerShare().div(10**_bestVault.decimals())\n ) {\n // Don't forget to approve the deposit\n if (\n _token.allowance(address(this), address(_bestVault)) <\n withdrawn.sub(amount)\n ) {\n _token.safeApprove(address(_bestVault), UNLIMITED_APPROVAL); // Vaults are trusted\n }\n\n _bestVault.deposit(withdrawn.sub(amount), sender);\n withdrawn = amount;\n }\n\n // `receiver` now has `withdrawn` tokens as balance\n if (receiver != address(this)) _token.safeTransfer(receiver, withdrawn);\n }\n\n function _migrate(\n address token,\n address account,\n uint256 amount,\n uint256 maxMigrationLoss\n ) internal returns (uint256 migrated) {\n VaultAPI _bestVault = bestVault(address(token));\n\n // NOTE: Only override if we aren't migrating everything\n uint256 _depositLimit = _bestVault.depositLimit();\n uint256 _totalAssets = _bestVault.totalAssets();\n if (_depositLimit <= _totalAssets) return 0; // Nothing to migrate (not a failure)\n\n uint256 _amount = amount;\n if (\n _depositLimit < UNCAPPED_DEPOSITS && _amount < WITHDRAW_EVERYTHING\n ) {\n // Can only deposit up to this amount\n uint256 _depositLeft = _depositLimit.sub(_totalAssets);\n if (_amount > _depositLeft) _amount = _depositLeft;\n }\n\n if (_amount > 0) {\n // NOTE: `false` = don't withdraw from `_bestVault`\n uint256 withdrawn = _withdraw(\n token,\n account,\n address(this),\n _amount,\n false\n );\n if (withdrawn == 0) return 0; // Nothing to migrate (not a failure)\n\n // NOTE: `false` = don't do `transferFrom` because it's already local\n migrated = _deposit(\n token,\n address(this),\n account,\n withdrawn,\n false\n );\n // NOTE: Due to the precision loss of certain calculations, there is a small inefficency\n // on how migrations are calculated, and this could lead to a DoS issue. Hence, this\n // value is made to be configurable to allow the user to specify how much is acceptable\n require(withdrawn.sub(migrated) <= maxMigrationLoss);\n } // else: nothing to migrate! (not a failure)\n }\n\n function registry() public view virtual returns (RegistryAPI);\n}\n"},{"file_path":"./contracts/helpers/uni-v2/UniswapV2ERC20.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\nimport \"./interfaces/IUniswapV2ERC20.sol\";\nimport \"./libraries/SafeMath.sol\";\n\ncontract UniswapV2ERC20 {\n using SafeMath for uint256;\n\n uint8 public constant decimals = 18;\n\n uint256 public totalSupply;\n mapping(address => uint256) public balanceOf;\n mapping(address => mapping(address => uint256)) public allowance;\n\n bytes32 public DOMAIN_SEPARATOR;\n // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n bytes32 public constant PERMIT_TYPEHASH =\n 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n mapping(address => uint256) public nonces;\n\n event Approval(\n address indexed owner,\n address indexed spender,\n uint256 value\n );\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n constructor() {\n uint256 chainId;\n assembly {\n chainId := chainid()\n }\n DOMAIN_SEPARATOR = keccak256(\n abi.encode(\n keccak256(\n \"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"\n ),\n keccak256(bytes(name())),\n keccak256(bytes(\"1\")),\n chainId,\n address(this)\n )\n );\n }\n\n function _mint(address to, uint256 value) internal {\n totalSupply = totalSupply.add(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(address(0), to, value);\n }\n\n function _burn(address from, uint256 value) internal {\n balanceOf[from] = balanceOf[from].sub(value);\n totalSupply = totalSupply.sub(value);\n emit Transfer(from, address(0), value);\n }\n\n function _approve(\n address owner,\n address spender,\n uint256 value\n ) private {\n allowance[owner][spender] = value;\n emit Approval(owner, spender, value);\n }\n\n function _transfer(\n address from,\n address to,\n uint256 value\n ) private {\n balanceOf[from] = balanceOf[from].sub(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(from, to, value);\n }\n\n function approve(address spender, uint256 value) external returns (bool) {\n _approve(msg.sender, spender, value);\n return true;\n }\n\n function transfer(address to, uint256 value) external returns (bool) {\n _transfer(msg.sender, to, value);\n return true;\n }\n\n function transferFrom(\n address from,\n address to,\n uint256 value\n ) external returns (bool) {\n if (allowance[from][msg.sender] != ~uint256(0)) {\n allowance[from][msg.sender] = allowance[from][msg.sender].sub(\n value\n );\n }\n _transfer(from, to, value);\n return true;\n }\n\n function permit(\n address owner,\n address spender,\n uint256 value,\n uint256 deadline,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) external {\n require(deadline >= block.timestamp, \"UniswapV2: EXPIRED\");\n bytes32 digest = keccak256(\n abi.encodePacked(\n \"\\x19\\x01\",\n DOMAIN_SEPARATOR,\n keccak256(\n abi.encode(\n PERMIT_TYPEHASH,\n owner,\n spender,\n value,\n nonces[owner]++,\n deadline\n )\n )\n )\n );\n address recoveredAddress = ecrecover(digest, v, r, s);\n require(\n recoveredAddress != address(0) && recoveredAddress == owner,\n \"UniswapV2: INVALID_SIGNATURE\"\n );\n _approve(owner, spender, value);\n }\n\n function name() public view virtual returns (string memory) {\n return \"Uniswap V2\";\n }\n\n function symbol() public view virtual returns (string memory) {\n return \"UNI-V2\";\n }\n}\n"},{"file_path":"./contracts/helpers/uni-v2/UniswapV2Factory.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\nimport \"./interfaces/IUniswapV2Factory.sol\";\nimport \"./UniswapV2Pair.sol\";\n\ncontract UniswapV2Factory {\n address public feeTo;\n address public feeToSetter;\n\n mapping(address => mapping(address => address)) public getPair;\n address[] public allPairs;\n\n event PairCreated(\n address indexed token0,\n address indexed token1,\n address pair,\n uint256\n );\n\n constructor(address _feeToSetter) {\n feeToSetter = _feeToSetter;\n }\n\n function allPairsLength() external view returns (uint256) {\n return allPairs.length;\n }\n\n function createPair(address tokenA, address tokenB)\n external\n virtual\n returns (address pair)\n {\n require(tokenA != tokenB, \"UniswapV2: IDENTICAL_ADDRESSES\");\n (address token0, address token1) = tokenA < tokenB\n ? (tokenA, tokenB)\n : (tokenB, tokenA);\n require(token0 != address(0), \"UniswapV2: ZERO_ADDRESS\");\n require(\n getPair[token0][token1] == address(0),\n \"UniswapV2: PAIR_EXISTS\"\n ); // single check is sufficient\n bytes memory bytecode = type(UniswapV2Pair).creationCode;\n bytes32 salt = keccak256(abi.encodePacked(token0, token1));\n assembly {\n pair := create2(0, add(bytecode, 32), mload(bytecode), salt)\n }\n IUniswapV2Pair(pair).initialize(token0, token1);\n getPair[token0][token1] = pair;\n getPair[token1][token0] = pair; // populate mapping in the reverse direction\n allPairs.push(pair);\n emit PairCreated(token0, token1, pair, allPairs.length);\n }\n\n function setFeeTo(address _feeTo) external {\n require(msg.sender == feeToSetter, \"UniswapV2: FORBIDDEN\");\n feeTo = _feeTo;\n }\n\n function setFeeToSetter(address _feeToSetter) external {\n require(msg.sender == feeToSetter, \"UniswapV2: FORBIDDEN\");\n feeToSetter = _feeToSetter;\n }\n}\n"},{"file_path":"./contracts/helpers/uni-v2/UniswapV2Pair.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\nimport \"./interfaces/IUniswapV2Pair.sol\";\nimport \"./UniswapV2ERC20.sol\";\nimport \"./libraries/Math.sol\";\nimport \"./libraries/UQ112x112.sol\";\nimport \"./interfaces/IERC20.sol\";\nimport \"./interfaces/IUniswapV2Factory.sol\";\nimport \"./interfaces/IUniswapV2Callee.sol\";\n\ncontract UniswapV2Pair is UniswapV2ERC20 {\n using SafeMath for uint256;\n using UQ112x112 for uint224;\n\n uint256 public constant MINIMUM_LIQUIDITY = 10**3;\n bytes4 internal constant SELECTOR =\n bytes4(keccak256(bytes(\"transfer(address,uint256)\")));\n\n address public factory;\n address public token0;\n address public token1;\n\n uint112 internal reserve0; // uses single storage slot, accessible via getReserves\n uint112 internal reserve1; // uses single storage slot, accessible via getReserves\n uint32 internal blockTimestampLast; // uses single storage slot, accessible via getReserves\n\n uint256 public price0CumulativeLast;\n uint256 public price1CumulativeLast;\n uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event\n\n uint256 internal unlocked = 1;\n modifier lock() {\n require(unlocked == 1, \"UniswapV2: LOCKED\");\n unlocked = 0;\n _;\n unlocked = 1;\n }\n\n event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n event Burn(\n address indexed sender,\n uint256 amount0,\n uint256 amount1,\n address indexed to\n );\n event Swap(\n address indexed sender,\n uint256 amount0In,\n uint256 amount1In,\n uint256 amount0Out,\n uint256 amount1Out,\n address indexed to\n );\n event Sync(uint112 reserve0, uint112 reserve1);\n\n constructor() {\n factory = msg.sender;\n }\n\n // called once by the factory at time of deployment\n function initialize(address _token0, address _token1) public virtual {\n require(msg.sender == factory, \"UniswapV2: FORBIDDEN\"); // sufficient check\n token0 = _token0;\n token1 = _token1;\n }\n\n // this low-level function should be called from a contract which performs important safety checks\n function mint(address to) public virtual lock returns (uint256 liquidity) {\n (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n uint256 balance0 = _balanceOf(token0);\n uint256 balance1 = _balanceOf(token1);\n uint256 amount0 = balance0.sub(_reserve0);\n uint256 amount1 = balance1.sub(_reserve1);\n\n bool feeOn = _mintFee(_reserve0, _reserve1);\n uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n if (_totalSupply == 0) {\n liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);\n _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens\n } else {\n liquidity = Math.min(\n amount0.mul(_totalSupply) / _reserve0,\n amount1.mul(_totalSupply) / _reserve1\n );\n }\n require(liquidity > 0, \"UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED\");\n _mint(to, liquidity);\n\n _update(balance0, balance1, _reserve0, _reserve1);\n if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n emit Mint(msg.sender, amount0, amount1);\n }\n\n // this low-level function should be called from a contract which performs important safety checks\n function burn(address to)\n public\n virtual\n lock\n returns (uint256 amount0, uint256 amount1)\n {\n (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n address _token0 = token0; // gas savings\n address _token1 = token1; // gas savings\n uint256 balance0 = _balanceOf(_token0);\n uint256 balance1 = _balanceOf(_token1);\n uint256 liquidity = balanceOf[address(this)];\n\n bool feeOn = _mintFee(_reserve0, _reserve1);\n uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution\n amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution\n require(\n amount0 > 0 && amount1 > 0,\n \"UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED\"\n );\n _burn(address(this), liquidity);\n _safeTransfer(_token0, to, amount0);\n _safeTransfer(_token1, to, amount1);\n balance0 = _balanceOf(_token0);\n balance1 = _balanceOf(_token1);\n\n _update(balance0, balance1, _reserve0, _reserve1);\n if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n emit Burn(msg.sender, amount0, amount1, to);\n }\n\n // this low-level function should be called from a contract which performs important safety checks\n function swap(\n uint256 amount0Out,\n uint256 amount1Out,\n address to,\n bytes calldata data\n ) public virtual lock {\n require(\n amount0Out > 0 || amount1Out > 0,\n \"UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT\"\n );\n (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n require(\n amount0Out < _reserve0 && amount1Out < _reserve1,\n \"UniswapV2: INSUFFICIENT_LIQUIDITY\"\n );\n\n uint256 balance0;\n uint256 balance1;\n {\n // scope for _token{0,1}, avoids stack too deep errors\n address _token0 = token0;\n address _token1 = token1;\n require(to != _token0 && to != _token1, \"UniswapV2: INVALID_TO\");\n if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens\n if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens\n if (data.length > 0)\n IUniswapV2Callee(to).uniswapV2Call(\n msg.sender,\n amount0Out,\n amount1Out,\n data\n );\n balance0 = _balanceOf(_token0);\n balance1 = _balanceOf(_token1);\n }\n uint256 amount0In = balance0 > _reserve0 - amount0Out\n ? balance0 - (_reserve0 - amount0Out)\n : 0;\n uint256 amount1In = balance1 > _reserve1 - amount1Out\n ? balance1 - (_reserve1 - amount1Out)\n : 0;\n require(\n amount0In > 0 || amount1In > 0,\n \"UniswapV2: INSUFFICIENT_INPUT_AMOUNT\"\n );\n {\n // scope for reserve{0,1}Adjusted, avoids stack too deep errors\n uint256 balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));\n uint256 balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));\n require(\n balance0Adjusted.mul(balance1Adjusted) >=\n uint256(_reserve0).mul(_reserve1).mul(1000**2),\n \"UniswapV2: K\"\n );\n }\n\n _update(balance0, balance1, _reserve0, _reserve1);\n emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);\n }\n\n // force balances to match reserves\n function skim(address to) public virtual lock {\n address _token0 = token0; // gas savings\n address _token1 = token1; // gas savings\n _safeTransfer(_token0, to, _balanceOf(_token0).sub(reserve0));\n _safeTransfer(_token1, to, _balanceOf(_token1).sub(reserve1));\n }\n\n // force reserves to match balances\n function sync() public virtual lock {\n _update(_balanceOf(token0), _balanceOf(token1), reserve0, reserve1);\n }\n\n function getReserves()\n public\n view\n returns (\n uint112 _reserve0,\n uint112 _reserve1,\n uint32 _blockTimestampLast\n )\n {\n _reserve0 = reserve0;\n _reserve1 = reserve1;\n _blockTimestampLast = blockTimestampLast;\n }\n\n function _safeTransfer(\n address token,\n address to,\n uint256 value\n ) internal virtual {\n (bool success, bytes memory data) = token.call(\n abi.encodeWithSelector(SELECTOR, to, value)\n );\n require(\n success && (data.length == 0 || abi.decode(data, (bool))),\n \"UniswapV2: TRANSFER_FAILED\"\n );\n }\n\n // update reserves and, on the first call per block, price accumulators\n function _update(\n uint256 balance0,\n uint256 balance1,\n uint112 _reserve0,\n uint112 _reserve1\n ) internal virtual {\n require(\n balance0 <= ~uint112(0) && balance1 <= ~uint112(0),\n \"UniswapV2: OVERFLOW\"\n );\n uint32 blockTimestamp = uint32(block.timestamp % 2**32);\n uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired\n if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {\n // * never overflows, and + overflow is desired\n price0CumulativeLast +=\n uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) *\n timeElapsed;\n price1CumulativeLast +=\n uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) *\n timeElapsed;\n }\n reserve0 = uint112(balance0);\n reserve1 = uint112(balance1);\n blockTimestampLast = blockTimestamp;\n emit Sync(reserve0, reserve1);\n }\n\n // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)\n function _mintFee(uint112 _reserve0, uint112 _reserve1)\n internal\n virtual\n returns (bool feeOn)\n {\n address feeTo = IUniswapV2Factory(factory).feeTo();\n feeOn = feeTo != address(0);\n uint256 _kLast = kLast; // gas savings\n if (feeOn) {\n if (_kLast != 0) {\n uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));\n uint256 rootKLast = Math.sqrt(_kLast);\n if (rootK > rootKLast) {\n uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));\n uint256 denominator = rootK.mul(5).add(rootKLast);\n uint256 liquidity = numerator / denominator;\n if (liquidity > 0) _mint(feeTo, liquidity);\n }\n }\n } else if (_kLast != 0) {\n kLast = 0;\n }\n }\n\n function _balanceOf(address token) internal view virtual returns (uint256) {\n return IERC20(token).balanceOf(address(this));\n }\n}\n"},{"file_path":"./contracts/helpers/uni-v2/interfaces/IERC20.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\ninterface IERC20 {\n event Approval(\n address indexed owner,\n address indexed spender,\n uint256 value\n );\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n function name() external view returns (string memory);\n\n function symbol() external view returns (string memory);\n\n function decimals() external view returns (uint8);\n\n function totalSupply() external view returns (uint256);\n\n function balanceOf(address owner) external view returns (uint256);\n\n function allowance(address owner, address spender)\n external\n view\n returns (uint256);\n\n function approve(address spender, uint256 value) external returns (bool);\n\n function transfer(address to, uint256 value) external returns (bool);\n\n function transferFrom(\n address from,\n address to,\n uint256 value\n ) external returns (bool);\n}\n"},{"file_path":"./contracts/helpers/uni-v2/interfaces/IUniswapV2Callee.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\ninterface IUniswapV2Callee {\n function uniswapV2Call(\n address sender,\n uint256 amount0,\n uint256 amount1,\n bytes calldata data\n ) external;\n}\n"},{"file_path":"./contracts/helpers/uni-v2/interfaces/IUniswapV2ERC20.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\ninterface IUniswapV2ERC20 {\n event Approval(\n address indexed owner,\n address indexed spender,\n uint256 value\n );\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n function name() external pure returns (string memory);\n\n function symbol() external pure returns (string memory);\n\n function decimals() external pure returns (uint8);\n\n function totalSupply() external view returns (uint256);\n\n function balanceOf(address owner) external view returns (uint256);\n\n function allowance(address owner, address spender)\n external\n view\n returns (uint256);\n\n function approve(address spender, uint256 value) external returns (bool);\n\n function transfer(address to, uint256 value) external returns (bool);\n\n function transferFrom(\n address from,\n address to,\n uint256 value\n ) external returns (bool);\n\n function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n function nonces(address owner) external view returns (uint256);\n\n function permit(\n address owner,\n address spender,\n uint256 value,\n uint256 deadline,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) external;\n}\n"},{"file_path":"./contracts/helpers/uni-v2/interfaces/IUniswapV2Factory.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\ninterface IUniswapV2Factory {\n event PairCreated(\n address indexed token0,\n address indexed token1,\n address pair,\n uint256\n );\n\n function feeTo() external view returns (address);\n\n function feeToSetter() external view returns (address);\n\n function getPair(address tokenA, address tokenB)\n external\n view\n returns (address pair);\n\n function allPairs(uint256) external view returns (address pair);\n\n function allPairsLength() external view returns (uint256);\n\n function createPair(address tokenA, address tokenB)\n external\n returns (address pair);\n\n function setFeeTo(address) external;\n\n function setFeeToSetter(address) external;\n}\n"},{"file_path":"./contracts/helpers/uni-v2/interfaces/IUniswapV2Pair.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\ninterface IUniswapV2Pair {\n event Approval(\n address indexed owner,\n address indexed spender,\n uint256 value\n );\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n function name() external pure returns (string memory);\n\n function symbol() external pure returns (string memory);\n\n function decimals() external pure returns (uint8);\n\n function totalSupply() external view returns (uint256);\n\n function balanceOf(address owner) external view returns (uint256);\n\n function allowance(address owner, address spender)\n external\n view\n returns (uint256);\n\n function approve(address spender, uint256 value) external returns (bool);\n\n function transfer(address to, uint256 value) external returns (bool);\n\n function transferFrom(\n address from,\n address to,\n uint256 value\n ) external returns (bool);\n\n function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n function nonces(address owner) external view returns (uint256);\n\n function permit(\n address owner,\n address spender,\n uint256 value,\n uint256 deadline,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) external;\n\n event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n event Burn(\n address indexed sender,\n uint256 amount0,\n uint256 amount1,\n address indexed to\n );\n event Swap(\n address indexed sender,\n uint256 amount0In,\n uint256 amount1In,\n uint256 amount0Out,\n uint256 amount1Out,\n address indexed to\n );\n event Sync(uint112 reserve0, uint112 reserve1);\n\n function MINIMUM_LIQUIDITY() external pure returns (uint256);\n\n function factory() external view returns (address);\n\n function token0() external view returns (address);\n\n function token1() external view returns (address);\n\n function getReserves()\n external\n view\n returns (\n uint112 reserve0,\n uint112 reserve1,\n uint32 blockTimestampLast\n );\n\n function price0CumulativeLast() external view returns (uint256);\n\n function price1CumulativeLast() external view returns (uint256);\n\n function kLast() external view returns (uint256);\n\n function mint(address to) external returns (uint256 liquidity);\n\n function burn(address to)\n external\n returns (uint256 amount0, uint256 amount1);\n\n function swap(\n uint256 amount0Out,\n uint256 amount1Out,\n address to,\n bytes calldata data\n ) external;\n\n function skim(address to) external;\n\n function sync() external;\n\n function initialize(address, address) external;\n}\n"},{"file_path":"./contracts/helpers/uni-v2/libraries/Math.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\n// a library for performing various math operations\n\nlibrary Math {\n function min(uint256 x, uint256 y) internal pure returns (uint256 z) {\n z = x < y ? x : y;\n }\n\n // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)\n function sqrt(uint256 y) internal pure returns (uint256 z) {\n if (y > 3) {\n z = y;\n uint256 x = y / 2 + 1;\n while (x < z) {\n z = x;\n x = (y / x + x) / 2;\n }\n } else if (y != 0) {\n z = 1;\n }\n }\n}\n"},{"file_path":"./contracts/helpers/uni-v2/libraries/SafeMath.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\n// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)\n\nlibrary SafeMath {\n function add(uint256 x, uint256 y) internal pure returns (uint256 z) {\n require((z = x + y) >= x, \"ds-math-add-overflow\");\n }\n\n function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {\n require((z = x - y) <= x, \"ds-math-sub-underflow\");\n }\n\n function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {\n require(y == 0 || (z = x * y) / y == x, \"ds-math-mul-overflow\");\n }\n}\n"},{"file_path":"./contracts/helpers/uni-v2/libraries/UQ112x112.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\n// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))\n\n// range: [0, 2**112 - 1]\n// resolution: 1 / 2**112\n\nlibrary UQ112x112 {\n uint224 constant Q112 = 2**112;\n\n // encode a uint112 as a UQ112x112\n function encode(uint112 y) internal pure returns (uint224 z) {\n z = uint224(y) * Q112; // never overflows\n }\n\n // divide a UQ112x112 by a uint112, returning a UQ112x112\n function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {\n z = x / uint224(y);\n }\n}\n"},{"file_path":"./contracts/helpers/yearn/BaseStrategy.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {IERC20} from \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport {SafeERC20} from \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\n\nstruct StrategyParams {\n uint256 performanceFee;\n uint256 activation;\n uint256 debtRatio;\n uint256 minDebtPerHarvest;\n uint256 maxDebtPerHarvest;\n uint256 lastReport;\n uint256 totalDebt;\n uint256 totalGain;\n uint256 totalLoss;\n bool enforceChangeLimit;\n uint256 profitLimitRatio;\n uint256 lossLimitRatio;\n address customCheck;\n}\n\ninterface VaultAPI is IERC20 {\n function name() external view returns (string calldata);\n\n function symbol() external view returns (string calldata);\n\n function decimals() external view returns (uint256);\n\n function apiVersion() external pure returns (string memory);\n\n function permit(\n address owner,\n address spender,\n uint256 amount,\n uint256 expiry,\n bytes calldata signature\n ) external returns (bool);\n\n // NOTE: Vyper produces multiple signatures for a given function with \"default\" args\n function deposit() external returns (uint256);\n\n function deposit(uint256 amount) external returns (uint256);\n\n function deposit(uint256 amount, address recipient)\n external\n returns (uint256);\n\n // NOTE: Vyper produces multiple signatures for a given function with \"default\" args\n function withdraw() external returns (uint256);\n\n function withdraw(uint256 maxShares) external returns (uint256);\n\n function withdraw(uint256 maxShares, address recipient)\n external\n returns (uint256);\n\n function token() external view returns (address);\n\n function strategies(address _strategy)\n external\n view\n returns (StrategyParams memory);\n\n function pricePerShare() external view returns (uint256);\n\n function totalAssets() external view returns (uint256);\n\n function depositLimit() external view returns (uint256);\n\n function maxAvailableShares() external view returns (uint256);\n\n /**\n * View how much the Vault would increase this Strategy's borrow limit,\n * based on its present performance (since its last report). Can be used to\n * determine expectedReturn in your Strategy.\n */\n function creditAvailable() external view returns (uint256);\n\n /**\n * View how much the Vault would like to pull back from the Strategy,\n * based on its present performance (since its last report). Can be used to\n * determine expectedReturn in your Strategy.\n */\n function debtOutstanding() external view returns (uint256);\n\n /**\n * View how much the Vault expect this Strategy to return at the current\n * block, based on its present performance (since its last report). Can be\n * used to determine expectedReturn in your Strategy.\n */\n function expectedReturn() external view returns (uint256);\n\n /**\n * This is the main contact point where the Strategy interacts with the\n * Vault. It is critical that this call is handled as intended by the\n * Strategy. Therefore, this function will be called by BaseStrategy to\n * make sure the integration is correct.\n */\n function report(\n uint256 _gain,\n uint256 _loss,\n uint256 _debtPayment\n ) external returns (uint256);\n\n /**\n * This function should only be used in the scenario where the Strategy is\n * being retired but no migration of the positions are possible, or in the\n * extreme scenario that the Strategy needs to be put into \"Emergency Exit\"\n * mode in order for it to exit as quickly as possible. The latter scenario\n * could be for any reason that is considered \"critical\" that the Strategy\n * exits its position as fast as possible, such as a sudden change in\n * market conditions leading to losses, or an imminent failure in an\n * external dependency.\n */\n function revokeStrategy() external;\n\n /**\n * View the governance address of the Vault to assert privileged functions\n * can only be called by governance. The Strategy serves the Vault, so it\n * is subject to governance defined by the Vault.\n */\n function governance() external view returns (address);\n\n /**\n * View the management address of the Vault to assert privileged functions\n * can only be called by management. The Strategy serves the Vault, so it\n * is subject to management defined by the Vault.\n */\n function management() external view returns (address);\n\n /**\n * View the guardian address of the Vault to assert privileged functions\n * can only be called by guardian. The Strategy serves the Vault, so it\n * is subject to guardian defined by the Vault.\n */\n function guardian() external view returns (address);\n}\n\n/**\n * This interface is here for the keeper bot to use.\n */\ninterface StrategyAPI {\n function name() external view returns (string memory);\n\n function vault() external view returns (address);\n\n function want() external view returns (address);\n\n function apiVersion() external pure returns (string memory);\n\n function keeper() external view returns (address);\n\n function isActive() external view returns (bool);\n\n function delegatedAssets() external view returns (uint256);\n\n function estimatedTotalAssets() external view returns (uint256);\n\n function tendTrigger(uint256 callCost) external view returns (bool);\n\n function tend() external;\n\n function harvestTrigger(uint256 callCost) external view returns (bool);\n\n function harvest() external;\n\n event Harvested(\n uint256 profit,\n uint256 loss,\n uint256 debtPayment,\n uint256 debtOutstanding\n );\n}\n\n/**\n * @title Yearn Base Strategy\n * @author yearn.finance\n * @notice\n * BaseStrategy implements all of the required functionality to interoperate\n * closely with the Vault contract. This contract should be inherited and the\n * abstract methods implemented to adapt the Strategy to the particular needs\n * it has to create a return.\n *\n * Of special interest is the relationship between `harvest()` and\n * `vault.report()'. `harvest()` may be called simply because enough time has\n * elapsed since the last report, and not because any funds need to be moved\n * or positions adjusted. This is critical so that the Vault may maintain an\n * accurate picture of the Strategy's performance. See `vault.report()`,\n * `harvest()`, and `harvestTrigger()` for further details.\n */\n\nabstract contract BaseStrategy {\n using SafeMath for uint256;\n string public metadataURI;\n\n /**\n * @notice\n * Used to track which version of `StrategyAPI` this Strategy\n * implements.\n * @dev The Strategy's version must match the Vault's `API_VERSION`.\n * @return A string which holds the current API version of this contract.\n */\n function apiVersion() public pure returns (string memory) {\n return \"0.4.2\";\n }\n\n /**\n * @notice This Strategy's name.\n * @dev\n * You can use this field to manage the \"version\" of this Strategy, e.g.\n * `StrategySomethingOrOtherV1`. However, \"API Version\" is managed by\n * `apiVersion()` function above.\n * @return This Strategy's name.\n */\n function name() external view virtual returns (string memory);\n\n /**\n * @notice\n * The amount (priced in want) of the total assets managed by this strategy should not count\n * towards Yearn's TVL calculations.\n * @dev\n * You can override this field to set it to a non-zero value if some of the assets of this\n * Strategy is somehow delegated inside another part of of Yearn's ecosystem e.g. another Vault.\n * Note that this value must be strictly less than or equal to the amount provided by\n * `estimatedTotalAssets()` below, as the TVL calc will be total assets minus delegated assets.\n * Also note that this value is used to determine the total assets under management by this\n * strategy, for the purposes of computing the management fee in `Vault`\n * @return\n * The amount of assets this strategy manages that should not be included in Yearn's Total Value\n * Locked (TVL) calculation across it's ecosystem.\n */\n function delegatedAssets() external view virtual returns (uint256) {\n return 0;\n }\n\n VaultAPI public vault;\n address public strategist;\n address public rewards;\n address public keeper;\n\n IERC20 public want;\n\n // So indexers can keep track of this\n event Harvested(\n uint256 profit,\n uint256 loss,\n uint256 debtPayment,\n uint256 debtOutstanding\n );\n\n event UpdatedStrategist(address newStrategist);\n\n event UpdatedKeeper(address newKeeper);\n\n event UpdatedRewards(address rewards);\n\n event UpdatedMinReportDelay(uint256 delay);\n\n event UpdatedMaxReportDelay(uint256 delay);\n\n event UpdatedProfitFactor(uint256 profitFactor);\n\n event UpdatedDebtThreshold(uint256 debtThreshold);\n\n event EmergencyExitEnabled();\n\n event UpdatedMetadataURI(string metadataURI);\n\n // The minimum number of seconds between harvest calls. See\n // `setMinReportDelay()` for more details.\n uint256 public minReportDelay;\n\n // The maximum number of seconds between harvest calls. See\n // `setMaxReportDelay()` for more details.\n uint256 public maxReportDelay;\n\n // The minimum multiple that `callCost` must be above the credit/profit to\n // be \"justifiable\". See `setProfitFactor()` for more details.\n uint256 public profitFactor;\n\n // Use this to adjust the threshold at which running a debt causes a\n // harvest trigger. See `setDebtThreshold()` for more details.\n uint256 public debtThreshold;\n\n // See note on `setEmergencyExit()`.\n bool public emergencyExit;\n\n // modifiers\n modifier onlyAuthorized() {\n require(\n msg.sender == strategist || msg.sender == governance(),\n \"!authorized\"\n );\n _;\n }\n\n modifier onlyEmergencyAuthorized() {\n require(\n msg.sender == strategist ||\n msg.sender == governance() ||\n msg.sender == vault.guardian() ||\n msg.sender == vault.management(),\n \"!authorized\"\n );\n _;\n }\n\n modifier onlyStrategist() {\n require(msg.sender == strategist, \"!strategist\");\n _;\n }\n\n modifier onlyGovernance() {\n require(msg.sender == governance(), \"!authorized\");\n _;\n }\n\n modifier onlyKeepers() {\n require(\n msg.sender == keeper ||\n msg.sender == strategist ||\n msg.sender == governance() ||\n msg.sender == vault.guardian() ||\n msg.sender == vault.management(),\n \"!authorized\"\n );\n _;\n }\n\n constructor(address _vault) {\n _initialize(_vault, msg.sender, msg.sender, msg.sender);\n }\n\n /**\n * @notice\n * Initializes the Strategy, this is called only once, when the\n * contract is deployed.\n * @dev `_vault` should implement `VaultAPI`.\n * @param _vault The address of the Vault responsible for this Strategy.\n * @param _strategist The address to assign as `strategist`.\n * The strategist is able to change the reward address\n * @param _rewards The address to use for pulling rewards.\n * @param _keeper The adddress of the _keeper. _keeper\n * can harvest and tend a strategy.\n */\n function _initialize(\n address _vault,\n address _strategist,\n address _rewards,\n address _keeper\n ) internal {\n require(address(want) == address(0), \"Strategy already initialized\");\n\n vault = VaultAPI(_vault);\n want = IERC20(vault.token());\n SafeERC20.safeApprove(want, _vault, type(uint256).max); // Give Vault unlimited access (might save gas)\n strategist = _strategist;\n rewards = _rewards;\n keeper = _keeper;\n\n // initialize variables\n minReportDelay = 0;\n maxReportDelay = 86400;\n profitFactor = 100;\n debtThreshold = 0;\n\n vault.approve(rewards, type(uint256).max); // Allow rewards to be pulled\n }\n\n /**\n * @notice\n * Used to change `strategist`.\n *\n * This may only be called by governance or the existing strategist.\n * @param _strategist The new address to assign as `strategist`.\n */\n function setStrategist(address _strategist) external onlyAuthorized {\n require(_strategist != address(0));\n strategist = _strategist;\n emit UpdatedStrategist(_strategist);\n }\n\n /**\n * @notice\n * Used to change `keeper`.\n *\n * `keeper` is the only address that may call `tend()` or `harvest()`,\n * other than `governance()` or `strategist`. However, unlike\n * `governance()` or `strategist`, `keeper` may *only* call `tend()`\n * and `harvest()`, and no other authorized functions, following the\n * principle of least privilege.\n *\n * This may only be called by governance or the strategist.\n * @param _keeper The new address to assign as `keeper`.\n */\n function setKeeper(address _keeper) external onlyAuthorized {\n require(_keeper != address(0));\n keeper = _keeper;\n emit UpdatedKeeper(_keeper);\n }\n\n /**\n * @notice\n * Used to change `rewards`. EOA or smart contract which has the permission\n * to pull rewards from the vault.\n *\n * This may only be called by the strategist.\n * @param _rewards The address to use for pulling rewards.\n */\n function setRewards(address _rewards) external onlyStrategist {\n require(_rewards != address(0));\n vault.approve(rewards, 0);\n rewards = _rewards;\n vault.approve(rewards, type(uint256).max);\n emit UpdatedRewards(_rewards);\n }\n\n /**\n * @notice\n * Used to change `minReportDelay`. `minReportDelay` is the minimum number\n * of blocks that should pass for `harvest()` to be called.\n *\n * For external keepers (such as the Keep3r network), this is the minimum\n * time between jobs to wait. (see `harvestTrigger()`\n * for more details.)\n *\n * This may only be called by governance or the strategist.\n * @param _delay The minimum number of seconds to wait between harvests.\n */\n function setMinReportDelay(uint256 _delay) external onlyAuthorized {\n minReportDelay = _delay;\n emit UpdatedMinReportDelay(_delay);\n }\n\n /**\n * @notice\n * Used to change `maxReportDelay`. `maxReportDelay` is the maximum number\n * of blocks that should pass for `harvest()` to be called.\n *\n * For external keepers (such as the Keep3r network), this is the maximum\n * time between jobs to wait. (see `harvestTrigger()`\n * for more details.)\n *\n * This may only be called by governance or the strategist.\n * @param _delay The maximum number of seconds to wait between harvests.\n */\n function setMaxReportDelay(uint256 _delay) external onlyAuthorized {\n maxReportDelay = _delay;\n emit UpdatedMaxReportDelay(_delay);\n }\n\n /**\n * @notice\n * Used to change `profitFactor`. `profitFactor` is used to determine\n * if it's worthwhile to harvest, given gas costs. (See `harvestTrigger()`\n * for more details.)\n *\n * This may only be called by governance or the strategist.\n * @param _profitFactor A ratio to multiply anticipated\n * `harvest()` gas cost against.\n */\n function setProfitFactor(uint256 _profitFactor) external onlyAuthorized {\n profitFactor = _profitFactor;\n emit UpdatedProfitFactor(_profitFactor);\n }\n\n /**\n * @notice\n * Sets how far the Strategy can go into loss without a harvest and report\n * being required.\n *\n * By default this is 0, meaning any losses would cause a harvest which\n * will subsequently report the loss to the Vault for tracking. (See\n * `harvestTrigger()` for more details.)\n *\n * This may only be called by governance or the strategist.\n * @param _debtThreshold How big of a loss this Strategy may carry without\n * being required to report to the Vault.\n */\n function setDebtThreshold(uint256 _debtThreshold) external onlyAuthorized {\n debtThreshold = _debtThreshold;\n emit UpdatedDebtThreshold(_debtThreshold);\n }\n\n /**\n * @notice\n * Used to change `metadataURI`. `metadataURI` is used to store the URI\n * of the file describing the strategy.\n *\n * This may only be called by governance or the strategist.\n * @param _metadataURI The URI that describe the strategy.\n */\n function setMetadataURI(string calldata _metadataURI)\n external\n onlyAuthorized\n {\n metadataURI = _metadataURI;\n emit UpdatedMetadataURI(_metadataURI);\n }\n\n /**\n * Resolve governance address from Vault contract, used to make assertions\n * on protected functions in the Strategy.\n */\n function governance() internal view returns (address) {\n return vault.governance();\n }\n\n /**\n * @notice\n * Provide an accurate conversion from `_amtInWei` (denominated in wei)\n * to `want` (using the native decimal characteristics of `want`).\n * @dev\n * Care must be taken when working with decimals to assure that the conversion\n * is compatible. As an example:\n *\n * given 1e17 wei (0.1 ETH) as input, and want is USDC (6 decimals),\n * with USDC/ETH = 1800, this should give back 1800000000 (180 USDC)\n *\n * @param _amtInWei The amount (in wei/1e-18 ETH) to convert to `want`\n * @return The amount in `want` of `_amtInEth` converted to `want`\n **/\n function ethToWant(uint256 _amtInWei) public view virtual returns (uint256);\n\n /**\n * @notice\n * Provide an accurate estimate for the total amount of assets\n * (principle + return) that this Strategy is currently managing,\n * denominated in terms of `want` tokens.\n *\n * This total should be \"realizable\" e.g. the total value that could\n * *actually* be obtained from this Strategy if it were to divest its\n * entire position based on current on-chain conditions.\n * @dev\n * Care must be taken in using this function, since it relies on external\n * systems, which could be manipulated by the attacker to give an inflated\n * (or reduced) value produced by this function, based on current on-chain\n * conditions (e.g. this function is possible to influence through\n * flashloan attacks, oracle manipulations, or other DeFi attack\n * mechanisms).\n *\n * It is up to governance to use this function to correctly order this\n * Strategy relative to its peers in the withdrawal queue to minimize\n * losses for the Vault based on sudden withdrawals. This value should be\n * higher than the total debt of the Strategy and higher than its expected\n * value to be \"safe\".\n * @return The estimated total assets in this Strategy.\n */\n function estimatedTotalAssets() public view virtual returns (uint256);\n\n /*\n * @notice\n * Provide an indication of whether this strategy is currently \"active\"\n * in that it is managing an active position, or will manage a position in\n * the future. This should correlate to `harvest()` activity, so that Harvest\n * events can be tracked externally by indexing agents.\n * @return True if the strategy is actively managing a position.\n */\n function isActive() public view returns (bool) {\n return\n vault.strategies(address(this)).debtRatio > 0 ||\n estimatedTotalAssets() > 0;\n }\n\n /**\n * Perform any Strategy unwinding or other calls necessary to capture the\n * \"free return\" this Strategy has generated since the last time its core\n * position(s) were adjusted. Examples include unwrapping extra rewards.\n * This call is only used during \"normal operation\" of a Strategy, and\n * should be optimized to minimize losses as much as possible.\n *\n * This method returns any realized profits and/or realized losses\n * incurred, and should return the total amounts of profits/losses/debt\n * payments (in `want` tokens) for the Vault's accounting (e.g.\n * `want.balanceOf(this) >= _debtPayment + _profit`).\n *\n * `_debtOutstanding` will be 0 if the Strategy is not past the configured\n * debt limit, otherwise its value will be how far past the debt limit\n * the Strategy is. The Strategy's debt limit is configured in the Vault.\n *\n * NOTE: `_debtPayment` should be less than or equal to `_debtOutstanding`.\n * It is okay for it to be less than `_debtOutstanding`, as that\n * should only used as a guide for how much is left to pay back.\n * Payments should be made to minimize loss from slippage, debt,\n * withdrawal fees, etc.\n *\n * See `vault.debtOutstanding()`.\n */\n function prepareReturn(uint256 _debtOutstanding)\n internal\n virtual\n returns (\n uint256 _profit,\n uint256 _loss,\n uint256 _debtPayment\n );\n\n /**\n * Perform any adjustments to the core position(s) of this Strategy given\n * what change the Vault made in the \"investable capital\" available to the\n * Strategy. Note that all \"free capital\" in the Strategy after the report\n * was made is available for reinvestment. Also note that this number\n * could be 0, and you should handle that scenario accordingly.\n *\n * See comments regarding `_debtOutstanding` on `prepareReturn()`.\n */\n function adjustPosition(uint256 _debtOutstanding) internal virtual;\n\n /**\n * Liquidate up to `_amountNeeded` of `want` of this strategy's positions,\n * irregardless of slippage. Any excess will be re-invested with `adjustPosition()`.\n * This function should return the amount of `want` tokens made available by the\n * liquidation. If there is a difference between them, `_loss` indicates whether the\n * difference is due to a realized loss, or if there is some other sitution at play\n * (e.g. locked funds) where the amount made available is less than what is needed.\n *\n * NOTE: The invariant `_liquidatedAmount + _loss <= _amountNeeded` should always be maintained\n */\n function liquidatePosition(uint256 _amountNeeded)\n internal\n virtual\n returns (uint256 _liquidatedAmount, uint256 _loss);\n\n /**\n * Liquidate everything and returns the amount that got freed.\n * This function is used during emergency exit instead of `prepareReturn()` to\n * liquidate all of the Strategy's positions back to the Vault.\n */\n\n function liquidateAllPositions()\n internal\n virtual\n returns (uint256 _amountFreed);\n\n /**\n * @notice\n * Provide a signal to the keeper that `tend()` should be called. The\n * keeper will provide the estimated gas cost that they would pay to call\n * `tend()`, and this function should use that estimate to make a\n * determination if calling it is \"worth it\" for the keeper. This is not\n * the only consideration into issuing this trigger, for example if the\n * position would be negatively affected if `tend()` is not called\n * shortly, then this can return `true` even if the keeper might be\n * \"at a loss\" (keepers are always reimbursed by Yearn).\n * @dev\n * `callCostInWei` must be priced in terms of `wei` (1e-18 ETH).\n *\n * This call and `harvestTrigger()` should never return `true` at the same\n * time.\n * @param callCostInWei The keeper's estimated gas cost to call `tend()` (in wei).\n * @return `true` if `tend()` should be called, `false` otherwise.\n */\n function tendTrigger(uint256 callCostInWei)\n public\n view\n virtual\n returns (bool)\n {\n // We usually don't need tend, but if there are positions that need\n // active maintainence, overriding this function is how you would\n // signal for that.\n // If your implementation uses the cost of the call in want, you can\n // use uint256 callCost = ethToWant(callCostInWei);\n\n return false;\n }\n\n /**\n * @notice\n * Adjust the Strategy's position. The purpose of tending isn't to\n * realize gains, but to maximize yield by reinvesting any returns.\n *\n * See comments on `adjustPosition()`.\n *\n * This may only be called by governance, the strategist, or the keeper.\n */\n function tend() external onlyKeepers {\n // Don't take profits with this call, but adjust for better gains\n adjustPosition(vault.debtOutstanding());\n }\n\n /**\n * @notice\n * Provide a signal to the keeper that `harvest()` should be called. The\n * keeper will provide the estimated gas cost that they would pay to call\n * `harvest()`, and this function should use that estimate to make a\n * determination if calling it is \"worth it\" for the keeper. This is not\n * the only consideration into issuing this trigger, for example if the\n * position would be negatively affected if `harvest()` is not called\n * shortly, then this can return `true` even if the keeper might be \"at a\n * loss\" (keepers are always reimbursed by Yearn).\n * @dev\n * `callCostInWei` must be priced in terms of `wei` (1e-18 ETH).\n *\n * This call and `tendTrigger` should never return `true` at the\n * same time.\n *\n * See `min/maxReportDelay`, `profitFactor`, `debtThreshold` to adjust the\n * strategist-controlled parameters that will influence whether this call\n * returns `true` or not. These parameters will be used in conjunction\n * with the parameters reported to the Vault (see `params`) to determine\n * if calling `harvest()` is merited.\n *\n * It is expected that an external system will check `harvestTrigger()`.\n * This could be a script run off a desktop or cloud bot (e.g.\n * https://github.com/iearn-finance/yearn-vaults/blob/master/scripts/keep.py),\n * or via an integration with the Keep3r network (e.g.\n * https://github.com/Macarse/GenericKeep3rV2/blob/master/contracts/keep3r/GenericKeep3rV2.sol).\n * @param callCostInWei The keeper's estimated gas cost to call `harvest()` (in wei).\n * @return `true` if `harvest()` should be called, `false` otherwise.\n */\n function harvestTrigger(uint256 callCostInWei)\n public\n view\n virtual\n returns (bool)\n {\n uint256 callCost = ethToWant(callCostInWei);\n StrategyParams memory params = vault.strategies(address(this));\n\n // Should not trigger if Strategy is not activated\n if (params.activation == 0) return false;\n\n // Should not trigger if we haven't waited long enough since previous harvest\n if (block.timestamp.sub(params.lastReport) < minReportDelay)\n return false;\n\n // Should trigger if hasn't been called in a while\n if (block.timestamp.sub(params.lastReport) >= maxReportDelay)\n return true;\n\n // If some amount is owed, pay it back\n // NOTE: Since debt is based on deposits, it makes sense to guard against large\n // changes to the value from triggering a harvest directly through user\n // behavior. This should ensure reasonable resistance to manipulation\n // from user-initiated withdrawals as the outstanding debt fluctuates.\n uint256 outstanding = vault.debtOutstanding();\n if (outstanding > debtThreshold) return true;\n\n // Check for profits and losses\n uint256 total = estimatedTotalAssets();\n // Trigger if we have a loss to report\n if (total.add(debtThreshold) < params.totalDebt) return true;\n\n uint256 profit = 0;\n if (total > params.totalDebt) profit = total.sub(params.totalDebt); // We've earned a profit!\n\n // Otherwise, only trigger if it \"makes sense\" economically (gas cost\n // is debtOutstanding) {\n profit = amountFreed.sub(debtOutstanding);\n }\n debtPayment = debtOutstanding.sub(loss);\n } else {\n // Free up returns for Vault to pull\n (profit, loss, debtPayment) = prepareReturn(debtOutstanding);\n }\n\n // Allow Vault to take up to the \"harvested\" balance of this contract,\n // which is the amount it has earned since the last time it reported to\n // the Vault.\n debtOutstanding = vault.report(profit, loss, debtPayment);\n\n // Check if free returns are left, and re-invest them\n adjustPosition(debtOutstanding);\n\n emit Harvested(profit, loss, debtPayment, debtOutstanding);\n }\n\n /**\n * @notice\n * Withdraws `_amountNeeded` to `vault`.\n *\n * This may only be called by the Vault.\n * @param _amountNeeded How much `want` to withdraw.\n * @return _loss Any realized losses\n */\n function withdraw(uint256 _amountNeeded) external returns (uint256 _loss) {\n require(msg.sender == address(vault), \"!vault\");\n // Liquidate as much as possible to `want`, up to `_amountNeeded`\n uint256 amountFreed;\n (amountFreed, _loss) = liquidatePosition(_amountNeeded);\n // Send it directly back (NOTE: Using `msg.sender` saves some gas here)\n SafeERC20.safeTransfer(want, msg.sender, amountFreed);\n // NOTE: Reinvest anything leftover on next `tend`/`harvest`\n }\n\n /**\n * Do anything necessary to prepare this Strategy for migration, such as\n * transferring any reserve or LP tokens, CDPs, or other tokens or stores of\n * value.\n */\n function prepareMigration(address _newStrategy) internal virtual;\n\n /**\n * @notice\n * Transfers all `want` from this Strategy to `_newStrategy`.\n *\n * This may only be called by the Vault.\n * @dev\n * The new Strategy's Vault must be the same as this Strategy's Vault.\n * The migration process should be carefully performed to make sure all\n * the assets are migrated to the new address, which should have never\n * interacted with the vault before.\n * @param _newStrategy The Strategy to migrate to.\n */\n function migrate(address _newStrategy) external {\n require(msg.sender == address(vault));\n require(BaseStrategy(_newStrategy).vault() == vault);\n prepareMigration(_newStrategy);\n SafeERC20.safeTransfer(\n want,\n _newStrategy,\n want.balanceOf(address(this))\n );\n }\n\n /**\n * @notice\n * Activates emergency exit. Once activated, the Strategy will exit its\n * position upon the next harvest, depositing all funds into the Vault as\n * quickly as is reasonable given on-chain conditions.\n *\n * This may only be called by governance or the strategist.\n * @dev\n * See `vault.setEmergencyShutdown()` and `harvest()` for further details.\n */\n function setEmergencyExit() external onlyEmergencyAuthorized {\n emergencyExit = true;\n vault.revokeStrategy();\n\n emit EmergencyExitEnabled();\n }\n\n /**\n * Override this to add all tokens/tokenized positions this contract\n * manages on a *persistent* basis (e.g. not just for swapping back to\n * want ephemerally).\n *\n * NOTE: Do *not* include `want`, already included in `sweep` below.\n *\n * Example:\n * ```\n * function protectedTokens() internal override view returns (address[] memory) {\n * address[] memory protected = new address[](3);\n * protected[0] = tokenA;\n * protected[1] = tokenB;\n * protected[2] = tokenC;\n * return protected;\n * }\n * ```\n */\n function protectedTokens() internal view virtual returns (address[] memory);\n\n /**\n * @notice\n * Removes tokens from this Strategy that are not the type of tokens\n * managed by this Strategy. This may be used in case of accidentally\n * sending the wrong kind of token to this Strategy.\n *\n * Tokens will be sent to `governance()`.\n *\n * This will fail if an attempt is made to sweep `want`, or any tokens\n * that are protected by this Strategy.\n *\n * This may only be called by governance.\n * @dev\n * Implement `protectedTokens()` to specify any additional tokens that\n * should be protected from sweeping in addition to `want`.\n * @param _token The token to transfer out of this vault.\n */\n function sweep(address _token) external onlyGovernance {\n require(_token != address(want), \"!want\");\n require(_token != address(vault), \"!shares\");\n\n address[] memory _protectedTokens = protectedTokens();\n for (uint256 i; i < _protectedTokens.length; i++)\n require(_token != _protectedTokens[i], \"!protected\");\n\n SafeERC20.safeTransfer(\n IERC20(_token),\n governance(),\n IERC20(_token).balanceOf(address(this))\n );\n }\n}\n\nabstract contract BaseStrategyInitializable is BaseStrategy {\n bool public isOriginal = true;\n event Cloned(address indexed clone);\n\n constructor(address _vault) BaseStrategy(_vault) {}\n\n function initialize(\n address _vault,\n address _strategist,\n address _rewards,\n address _keeper\n ) external virtual {\n _initialize(_vault, _strategist, _rewards, _keeper);\n }\n\n function clone(address _vault) external returns (address) {\n require(isOriginal, \"!clone\");\n return this.clone(_vault, msg.sender, msg.sender, msg.sender);\n }\n\n function clone(\n address _vault,\n address _strategist,\n address _rewards,\n address _keeper\n ) external returns (address newStrategy) {\n // Copied from https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol\n bytes20 addressBytes = bytes20(address(this));\n\n assembly {\n // EIP-1167 bytecode\n let clone_code := mload(0x40)\n mstore(\n clone_code,\n 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000\n )\n mstore(add(clone_code, 0x14), addressBytes)\n mstore(\n add(clone_code, 0x28),\n 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000\n )\n newStrategy := create(0, clone_code, 0x37)\n }\n\n BaseStrategyInitializable(newStrategy).initialize(\n _vault,\n _strategist,\n _rewards,\n _keeper\n );\n\n emit Cloned(newStrategy);\n }\n}\n"},{"file_path":"./contracts/helpers/yearn/BaseWrapper.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\npragma abicoder v2;\n\nimport {IERC20} from \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport {SafeERC20} from \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport {Math} from \"@openzeppelin/contracts/utils/math/Math.sol\";\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\nimport {VaultAPI} from \"./BaseStrategy.sol\";\n\ninterface RegistryAPI {\n function governance() external view returns (address);\n\n function latestVault(address token) external view returns (address);\n\n function numVaults(address token) external view returns (uint256);\n\n function vaults(address token, uint256 deploymentId)\n external\n view\n returns (address);\n}\n\n/**\n * @title Yearn Base Wrapper\n * @author yearn.finance\n * @notice\n * BaseWrapper implements all of the required functionality to interoperate\n * closely with the Vault contract. This contract should be inherited and the\n * abstract methods implemented to adapt the Wrapper.\n * A good starting point to build a wrapper is https://github.com/yearn/brownie-wrapper-mix\n *\n */\nabstract contract BaseWrapper {\n using Math for uint256;\n using SafeMath for uint256;\n\n IERC20 public token;\n\n // Reduce number of external calls (SLOADs stay the same)\n VaultAPI[] private _cachedVaults;\n\n RegistryAPI public registry;\n\n // ERC20 Unlimited Approvals (short-circuits VaultAPI.transferFrom)\n uint256 constant UNLIMITED_APPROVAL = type(uint256).max;\n // Sentinal values used to save gas on deposit/withdraw/migrate\n // NOTE: DEPOSIT_EVERYTHING == WITHDRAW_EVERYTHING == MIGRATE_EVERYTHING\n uint256 constant DEPOSIT_EVERYTHING = type(uint256).max;\n uint256 constant WITHDRAW_EVERYTHING = type(uint256).max;\n uint256 constant MIGRATE_EVERYTHING = type(uint256).max;\n // VaultsAPI.depositLimit is unlimited\n uint256 constant UNCAPPED_DEPOSITS = type(uint256).max;\n\n constructor(address _token, address _registry) {\n // Recommended to use a token with a `Registry.latestVault(_token) != address(0)`\n token = IERC20(_token);\n // Recommended to use `v2.registry.ychad.eth`\n registry = RegistryAPI(_registry);\n }\n\n /**\n * @notice\n * Used to update the yearn registry.\n * @param _registry The new _registry address.\n */\n function setRegistry(address _registry) external {\n require(msg.sender == registry.governance());\n // In case you want to override the registry instead of re-deploying\n registry = RegistryAPI(_registry);\n // Make sure there's no change in governance\n // NOTE: Also avoid bricking the wrapper from setting a bad registry\n require(msg.sender == registry.governance());\n }\n\n /**\n * @notice\n * Used to get the most revent vault for the token using the registry.\n * @return An instance of a VaultAPI\n */\n function bestVault() public view virtual returns (VaultAPI) {\n return VaultAPI(registry.latestVault(address(token)));\n }\n\n /**\n * @notice\n * Used to get all vaults from the registery for the token\n * @return An array containing instances of VaultAPI\n */\n function allVaults() public view virtual returns (VaultAPI[] memory) {\n uint256 cache_length = _cachedVaults.length;\n uint256 num_vaults = registry.numVaults(address(token));\n\n // Use cached\n if (cache_length == num_vaults) {\n return _cachedVaults;\n }\n\n VaultAPI[] memory vaults = new VaultAPI[](num_vaults);\n\n for (uint256 vault_id = 0; vault_id < cache_length; vault_id++) {\n vaults[vault_id] = _cachedVaults[vault_id];\n }\n\n for (\n uint256 vault_id = cache_length;\n vault_id < num_vaults;\n vault_id++\n ) {\n vaults[vault_id] = VaultAPI(\n registry.vaults(address(token), vault_id)\n );\n }\n\n return vaults;\n }\n\n function _updateVaultCache(VaultAPI[] memory vaults) internal {\n // NOTE: even though `registry` is update-able by Yearn, the intended behavior\n // is that any future upgrades to the registry will replay the version\n // history so that this cached value does not get out of date.\n if (vaults.length > _cachedVaults.length) {\n _cachedVaults = vaults;\n }\n }\n\n /**\n * @notice\n * Used to get the balance of an account accross all the vaults for a token.\n * @dev will be used to get the wrapper balance using totalVaultBalance(address(this)).\n * @param account The address of the account.\n * @return balance of token for the account accross all the vaults.\n */\n function totalVaultBalance(address account)\n public\n view\n returns (uint256 balance)\n {\n VaultAPI[] memory vaults = allVaults();\n\n for (uint256 id = 0; id < vaults.length; id++) {\n balance = balance.add(\n vaults[id]\n .balanceOf(account)\n .mul(vaults[id].pricePerShare())\n .div(10**uint256(vaults[id].decimals()))\n );\n }\n }\n\n /**\n * @notice\n * Used to get the TVL on the underlying vaults.\n * @return assets the sum of all the assets managed by the underlying vaults.\n */\n function totalAssets() public view returns (uint256 assets) {\n VaultAPI[] memory vaults = allVaults();\n\n for (uint256 id = 0; id < vaults.length; id++) {\n assets = assets.add(vaults[id].totalAssets());\n }\n }\n\n function _deposit(\n address depositor,\n address receiver,\n uint256 amount, // if `MAX_UINT256`, just deposit everything\n bool pullFunds // If true, funds need to be pulled from `depositor` via `transferFrom`\n ) internal returns (uint256 deposited) {\n VaultAPI _bestVault = bestVault();\n\n if (pullFunds) {\n if (amount != DEPOSIT_EVERYTHING) {\n SafeERC20.safeTransferFrom(\n token,\n depositor,\n address(this),\n amount\n );\n } else {\n SafeERC20.safeTransferFrom(\n token,\n depositor,\n address(this),\n token.balanceOf(depositor)\n );\n }\n }\n\n if (token.allowance(address(this), address(_bestVault)) < amount) {\n SafeERC20.safeApprove(token, address(_bestVault), 0); // Avoid issues with some tokens requiring 0\n SafeERC20.safeApprove(\n token,\n address(_bestVault),\n UNLIMITED_APPROVAL\n ); // Vaults are trusted\n }\n\n // Depositing returns number of shares deposited\n // NOTE: Shortcut here is assuming the number of tokens deposited is equal to the\n // number of shares credited, which helps avoid an occasional multiplication\n // overflow if trying to adjust the number of shares by the share price.\n uint256 beforeBal = token.balanceOf(address(this));\n if (receiver != address(this)) {\n _bestVault.deposit(amount, receiver);\n } else if (amount != DEPOSIT_EVERYTHING) {\n _bestVault.deposit(amount);\n } else {\n _bestVault.deposit();\n }\n\n uint256 afterBal = token.balanceOf(address(this));\n deposited = beforeBal.sub(afterBal);\n // `receiver` now has shares of `_bestVault` as balance, converted to `token` here\n // Issue a refund if not everything was deposited\n if (depositor != address(this) && afterBal > 0)\n SafeERC20.safeTransfer(token, depositor, afterBal);\n }\n\n function _withdraw(\n address sender,\n address receiver,\n uint256 amount, // if `MAX_UINT256`, just withdraw everything\n bool withdrawFromBest // If true, also withdraw from `_bestVault`\n ) internal returns (uint256 withdrawn) {\n VaultAPI _bestVault = bestVault();\n\n VaultAPI[] memory vaults = allVaults();\n _updateVaultCache(vaults);\n\n // NOTE: This loop will attempt to withdraw from each Vault in `allVaults` that `sender`\n // is deposited in, up to `amount` tokens. The withdraw action can be expensive,\n // so it if there is a denial of service issue in withdrawing, the downstream usage\n // of this wrapper contract must give an alternative method of withdrawing using\n // this function so that `amount` is less than the full amount requested to withdraw\n // (e.g. \"piece-wise withdrawals\"), leading to less loop iterations such that the\n // DoS issue is mitigated (at a tradeoff of requiring more txns from the end user).\n for (uint256 id = 0; id < vaults.length; id++) {\n if (!withdrawFromBest && vaults[id] == _bestVault) {\n continue; // Don't withdraw from the best\n }\n\n // Start with the total shares that `sender` has\n uint256 availableShares = vaults[id].balanceOf(sender);\n\n // Restrict by the allowance that `sender` has to this contract\n // NOTE: No need for allowance check if `sender` is this contract\n if (sender != address(this)) {\n availableShares = Math.min(\n availableShares,\n vaults[id].allowance(sender, address(this))\n );\n }\n\n // Limit by maximum withdrawal size from each vault\n availableShares = Math.min(\n availableShares,\n vaults[id].maxAvailableShares()\n );\n\n if (availableShares > 0) {\n // Intermediate step to move shares to this contract before withdrawing\n // NOTE: No need for share transfer if this contract is `sender`\n if (sender != address(this))\n vaults[id].transferFrom(\n sender,\n address(this),\n availableShares\n );\n\n if (amount != WITHDRAW_EVERYTHING) {\n // Compute amount to withdraw fully to satisfy the request\n uint256 estimatedShares = amount\n .sub(withdrawn) // NOTE: Changes every iteration\n .mul(10**uint256(vaults[id].decimals()))\n .div(vaults[id].pricePerShare()); // NOTE: Every Vault is different\n\n // Limit amount to withdraw to the maximum made available to this contract\n // NOTE: Avoid corner case where `estimatedShares` isn't precise enough\n // NOTE: If `0 < estimatedShares < 1` but `availableShares > 1`, this will withdraw more than necessary\n if (\n estimatedShares > 0 && estimatedShares < availableShares\n ) {\n withdrawn = withdrawn.add(\n vaults[id].withdraw(estimatedShares)\n );\n } else {\n withdrawn = withdrawn.add(\n vaults[id].withdraw(availableShares)\n );\n }\n } else {\n withdrawn = withdrawn.add(vaults[id].withdraw());\n }\n\n // Check if we have fully satisfied the request\n // NOTE: use `amount = WITHDRAW_EVERYTHING` for withdrawing everything\n if (amount <= withdrawn) break; // withdrawn as much as we needed\n }\n }\n\n // If we have extra, deposit back into `_bestVault` for `sender`\n // NOTE: Invariant is `withdrawn <= amount`\n if (\n withdrawn > amount &&\n withdrawn.sub(amount) >\n _bestVault.pricePerShare().div(10**_bestVault.decimals())\n ) {\n // Don't forget to approve the deposit\n if (\n token.allowance(address(this), address(_bestVault)) <\n withdrawn.sub(amount)\n ) {\n SafeERC20.safeApprove(\n token,\n address(_bestVault),\n UNLIMITED_APPROVAL\n ); // Vaults are trusted\n }\n\n _bestVault.deposit(withdrawn.sub(amount), sender);\n withdrawn = amount;\n }\n\n // `receiver` now has `withdrawn` tokens as balance\n if (receiver != address(this))\n SafeERC20.safeTransfer(token, receiver, withdrawn);\n }\n\n function _migrate(address account) internal returns (uint256) {\n return _migrate(account, MIGRATE_EVERYTHING);\n }\n\n function _migrate(address account, uint256 amount)\n internal\n returns (uint256)\n {\n // NOTE: In practice, it was discovered that <50 was the maximum we've see for this variance\n return _migrate(account, amount, 0);\n }\n\n function _migrate(\n address account,\n uint256 amount,\n uint256 maxMigrationLoss\n ) internal returns (uint256 migrated) {\n VaultAPI _bestVault = bestVault();\n\n // NOTE: Only override if we aren't migrating everything\n uint256 _depositLimit = _bestVault.depositLimit();\n uint256 _totalAssets = _bestVault.totalAssets();\n if (_depositLimit <= _totalAssets) return 0; // Nothing to migrate (not a failure)\n\n uint256 _amount = amount;\n if (\n _depositLimit < UNCAPPED_DEPOSITS && _amount < WITHDRAW_EVERYTHING\n ) {\n // Can only deposit up to this amount\n uint256 _depositLeft = _depositLimit.sub(_totalAssets);\n if (_amount > _depositLeft) _amount = _depositLeft;\n }\n\n if (_amount > 0) {\n // NOTE: `false` = don't withdraw from `_bestVault`\n uint256 withdrawn = _withdraw(\n account,\n address(this),\n _amount,\n false\n );\n if (withdrawn == 0) return 0; // Nothing to migrate (not a failure)\n\n // NOTE: `false` = don't do `transferFrom` because it's already local\n migrated = _deposit(address(this), account, withdrawn, false);\n // NOTE: Due to the precision loss of certain calculations, there is a small inefficency\n // on how migrations are calculated, and this could lead to a DoS issue. Hence, this\n // value is made to be configurable to allow the user to specify how much is acceptable\n require(withdrawn.sub(migrated) <= maxMigrationLoss);\n } // else: nothing to migrate! (not a failure)\n }\n}\n"},{"file_path":"./contracts/interfaces/IYapeFactory.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\nimport {IUniswapV2Factory} from \"../helpers/uni-v2/interfaces/IUniswapV2Factory.sol\";\n\ninterface IYapeFactory is IUniswapV2Factory {\n function registry() external view returns (address);\n\n function operator() external view returns (address);\n}\n"},{"file_path":"./contracts/interfaces/IYapePair.sol","source_code":"// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.0;\n\nimport {IUniswapV2Pair} from \"../helpers/uni-v2/interfaces/IUniswapV2Pair.sol\";\n\ninterface IYapePair is IUniswapV2Pair {\n function updateRegistry() external;\n\n function setFarmingRatio(uint256 min, uint256 max) external;\n\n function migrate(address token) external returns (uint256);\n\n function migrate(address token, uint256 amount) external returns (uint256);\n\n function migrate(\n address token,\n uint256 amount,\n uint256 maxMigrationLoss\n ) external returns (uint256);\n}\n"},{"file_path":"@openzeppelin/contracts/token/ERC20/IERC20.sol","source_code":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},{"file_path":"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol","source_code":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\nimport \"../../../utils/Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n using Address for address;\n\n function safeTransfer(IERC20 token, address to, uint256 value) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n /**\n * @dev Deprecated. This function has issues similar to the ones found in\n * {IERC20-approve}, and its usage is discouraged.\n *\n * Whenever possible, use {safeIncreaseAllowance} and\n * {safeDecreaseAllowance} instead.\n */\n function safeApprove(IERC20 token, address spender, uint256 value) internal {\n // safeApprove should only be called when setting an initial allowance,\n // or when resetting it to zero. To increase and decrease it, use\n // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n // solhint-disable-next-line max-line-length\n require((value == 0) || (token.allowance(address(this), spender) == 0),\n \"SafeERC20: approve from non-zero to non-zero allowance\"\n );\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n }\n\n function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n uint256 newAllowance = token.allowance(address(this), spender) + value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n unchecked {\n uint256 oldAllowance = token.allowance(address(this), spender);\n require(oldAllowance >= value, \"SafeERC20: decreased allowance below zero\");\n uint256 newAllowance = oldAllowance - value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n }\n\n /**\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n * on the return value: the return value is optional (but if data is returned, it must not be false).\n * @param token The token targeted by the call.\n * @param data The call data (encoded using abi.encode or one of its variants).\n */\n function _callOptionalReturn(IERC20 token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n // the target address contains contract code and also asserts for success in the low-level call.\n\n bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n if (returndata.length > 0) { // Return data is optional\n // solhint-disable-next-line max-line-length\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n }\n }\n}\n"},{"file_path":"@openzeppelin/contracts/utils/Address.sol","source_code":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following\n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize, which returns 0 for contracts in\n // construction, since the code is only stored at the end of the\n // constructor execution.\n\n uint256 size;\n // solhint-disable-next-line no-inline-assembly\n assembly { size := extcodesize(account) }\n return size > 0;\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n (bool success, ) = recipient.call{ value: amount }(\"\");\n require(success, \"Address: unable to send value, recipient may have reverted\");\n }\n\n /**\n * @dev Performs a Solidity function call using a low level `call`. A\n * plain`call` is an unsafe replacement for a function call: use this\n * function instead.\n *\n * If `target` reverts with a revert reason, it is bubbled up by this\n * function (like regular Solidity function calls).\n *\n * Returns the raw returned data. To convert to the expected return value,\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n *\n * Requirements:\n *\n * - `target` must be a contract.\n * - calling `target` with `data` must not revert.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionCall(target, data, \"Address: low-level call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n * `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n return functionCallWithValue(target, data, 0, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but also transferring `value` wei to `target`.\n *\n * Requirements:\n *\n * - the calling contract must have an ETH balance of at least `value`.\n * - the called Solidity function must be `payable`.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n * with `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\n require(isContract(target), \"Address: call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.call{ value: value }(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\n require(isContract(target), \"Address: static call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.staticcall(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n require(isContract(target), \"Address: delegate call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\n if (success) {\n return returndata;\n } else {\n // Look for revert reason and bubble it up if present\n if (returndata.length > 0) {\n // The easiest way to bubble the revert reason is using memory via assembly\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n let returndata_size := mload(returndata)\n revert(add(32, returndata), returndata_size)\n }\n } else {\n revert(errorMessage);\n }\n }\n }\n}\n"},{"file_path":"@openzeppelin/contracts/utils/math/Math.sol","source_code":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n /**\n * @dev Returns the largest of two numbers.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a >= b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two numbers. The result is rounded towards\n * zero.\n */\n function average(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b) / 2 can overflow, so we distribute\n return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);\n }\n}\n"},{"file_path":"@openzeppelin/contracts/utils/math/SafeMath.sol","source_code":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\n// CAUTION\n// This version of SafeMath should only be used with Solidity 0.8 or later,\n// because it relies on the compiler's built in overflow checks.\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations.\n *\n * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler\n * now has built in overflow checking.\n */\nlibrary SafeMath {\n /**\n * @dev Returns the addition of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n uint256 c = a + b;\n if (c < a) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the substraction of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b > a) return (false, 0);\n return (true, a - b);\n }\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n if (a == 0) return (true, 0);\n uint256 c = a * b;\n if (c / a != b) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the division of two unsigned integers, with a division by zero flag.\n *\n * _Available since v3.4._\n */\n function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a / b);\n }\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n *\n * _Available since v3.4._\n */\n function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a % b);\n }\n }\n\n /**\n * @dev Returns the addition of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `+` operator.\n *\n * Requirements:\n *\n * - Addition cannot overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n return a + b;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n return a - b;\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `*` operator.\n *\n * Requirements:\n *\n * - Multiplication cannot overflow.\n */\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n return a * b;\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers, reverting on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator.\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\n return a / b;\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * reverting when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n return a % b;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n * overflow (when the result is negative).\n *\n * CAUTION: This function is deprecated because it requires allocating memory for the error\n * message unnecessarily. For custom revert reasons use {trySub}.\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n unchecked {\n require(b <= a, errorMessage);\n return a - b;\n }\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers, reverting with custom message on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n unchecked {\n require(b > 0, errorMessage);\n return a / b;\n }\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * reverting with custom message when dividing by zero.\n *\n * CAUTION: This function is deprecated because it requires allocating memory for the error\n * message unnecessarily. For custom revert reasons use {tryMod}.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n unchecked {\n require(b > 0, errorMessage);\n return a % b;\n }\n }\n}\n"}],"certified":false,"conflicting_implementations":null,"abi":[{"inputs":[{"internalType":"address","name":"feeToSetter_","type":"address"},{"internalType":"address","name":"registry_","type":"address"},{"internalType":"address","name":"operator_","type":"address"},{"internalType":"address","name":"pairCode_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"PairCreated","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"operator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pairCode","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator_","type":"address"}],"name":"setOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"registry_","type":"address"}],"name":"setRegistry","outputs":[],"stateMutability":"nonpayable","type":"function"}],"is_changed_bytecode":false,"is_partially_verified":true,"constructor_args":"0x000000000000000000000000d8965d4fabfa616110ac8737c74f5e4948c6d95200000000000000000000000050c1a2ea0a861a967d9d0ffe2ae4012c2e053804000000000000000000000000d8965d4fabfa616110ac8737c74f5e4948c6d9520000000000000000000000008b2b880303f65da62ae442a658d5d4170ee470d8"}