Overview
ETH Balance
0.000000000060459938 ETH
ETH Value
Less Than $0.01 (@ $3,910.53/ETH)Token Holdings
More Info
Private Name Tags
ContractCreator
TokenTracker
Latest 25 from a total of 474,518 transactions
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Transfer | 129268147 | 43 hrs ago | IN | 0 ETH | 0.000000131632 | ||||
Burn To Withdraw | 129233290 | 2 days ago | IN | 0 ETH | 0.000001595374 | ||||
Approve | 129200854 | 3 days ago | IN | 0 ETH | 0.000000132411 | ||||
Approve | 129200850 | 3 days ago | IN | 0 ETH | 0.000000132411 | ||||
Burn To Withdraw | 129193858 | 3 days ago | IN | 0 ETH | 0.000000659632 | ||||
Burn To Withdraw | 129173908 | 3 days ago | IN | 0 ETH | 0.000000310607 | ||||
Unlock Deposit | 129173881 | 3 days ago | IN | 0 ETH | 0.000000262656 | ||||
Burn To Withdraw | 129162205 | 4 days ago | IN | 0 ETH | 0.000000444117 | ||||
Burn To Withdraw | 129156891 | 4 days ago | IN | 0 ETH | 0.000000179195 | ||||
Burn To Withdraw | 129054230 | 6 days ago | IN | 0 ETH | 0.000000413805 | ||||
Burn To Withdraw | 129015648 | 7 days ago | IN | 0 ETH | 0.000000861153 | ||||
Approve | 128998082 | 8 days ago | IN | 0 ETH | 0.000000852507 | ||||
Burn To Withdraw | 128989072 | 8 days ago | IN | 0 ETH | 0.000000888321 | ||||
Unlock Deposit | 128989039 | 8 days ago | IN | 0 ETH | 0.000000802961 | ||||
Burn To Withdraw | 128976149 | 8 days ago | IN | 0 ETH | 0.000000532474 | ||||
Burn To Withdraw | 128963177 | 8 days ago | IN | 0 ETH | 0.000000613065 | ||||
Unlock Deposit | 128866300 | 11 days ago | IN | 0 ETH | 0.000000519725 | ||||
Approve | 128822075 | 12 days ago | IN | 0 ETH | 0.000000290948 | ||||
Burn To Withdraw | 128814120 | 12 days ago | IN | 0 ETH | 0.000000581358 | ||||
Burn To Withdraw | 128801085 | 12 days ago | IN | 0 ETH | 0.000001227211 | ||||
Burn To Withdraw | 128793945 | 12 days ago | IN | 0 ETH | 0.000000224278 | ||||
Unlock Deposit | 128786317 | 12 days ago | IN | 0 ETH | 0.00000146949 | ||||
Burn To Withdraw | 128770595 | 13 days ago | IN | 0 ETH | 0.000001042359 | ||||
Burn To Withdraw | 128770396 | 13 days ago | IN | 0 ETH | 0.000001194224 | ||||
Approve | 128759862 | 13 days ago | IN | 0 ETH | 0.000001050725 |
Latest 25 internal transactions (View All)
Advanced mode:
Parent Transaction Hash | Block | From | To | |||
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128727700 | 14 days ago | 0.11 ETH | ||||
128700530 | 14 days ago | 0.00115222526918 ETH | ||||
128700530 | 14 days ago | 0.00115222526918 ETH | ||||
128700492 | 14 days ago | 0.002041567794286 ETH | ||||
128700492 | 14 days ago | 0.002041567794286 ETH | ||||
128700455 | 14 days ago | 0.001085192411721 ETH | ||||
128700455 | 14 days ago | 0.001085192411721 ETH | ||||
128564457 | 18 days ago | 0.019 ETH | ||||
128535728 | 18 days ago | 0.005 ETH | ||||
128535644 | 18 days ago | 0.001 ETH | ||||
128533220 | 18 days ago | 0.000085 ETH | ||||
128527734 | 18 days ago | 0.0008 ETH | ||||
128521811 | 19 days ago | 0.001 ETH | ||||
128396406 | 21 days ago | 0.000035059707187 ETH | ||||
128396406 | 21 days ago | 0.000035059707187 ETH | ||||
128179581 | 27 days ago | 0.0035 ETH | ||||
127877614 | 33 days ago | 0.0036 ETH | ||||
127745145 | 37 days ago | 0.0031 ETH | ||||
127728101 | 37 days ago | 0.001595612831629 ETH | ||||
127728101 | 37 days ago | 0.001595612831629 ETH | ||||
127721252 | 37 days ago | 0.001374221085431 ETH | ||||
127721252 | 37 days ago | 0.001374221085431 ETH | ||||
127718224 | 37 days ago | 0.00007 ETH | ||||
127718224 | 37 days ago | 0.00007 ETH | ||||
127694547 | 38 days ago | 0.00007 ETH |
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Contract Name:
ClipperPackedVerifiedExchange
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
//SPDX-License-Identifier: Copyright 2022 Shipyard Software, Inc. pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "./ClipperCommonPacked.sol"; import "./ClipperVerifiedExchange.sol"; contract ClipperPackedVerifiedExchange is ClipperCommonPacked, ClipperVerifiedExchange { using SafeERC20 for IERC20; constructor(address theSigner, address theWrapper, address[] memory tokens) ClipperVerifiedExchange(theSigner, theWrapper, tokens) {} /* unpackAndSwap: internal function that performs unpacks a set of calldata-packed inputs and performs a swap Input arguments: packedInput: input amount and contract packedOutput: output amount and contract packedGoodUntil: packed good until (for verifier, direct from server) auxData: bytes32, identifier. Final 20 bytes are destination address. First 12 bytes are auxData identifier string. r, vs: Signature values using EIP 2098 - https://eips.ethereum.org/EIPS/eip-2098 performTransfer: if tokens should be transferred from msg.sender */ function unpackAndSwap(uint256 packedInput, uint256 packedOutput, uint256 packedGoodUntil, bytes32 auxData, bytes32 r, bytes32 vs, bool performTransfer) internal override { (uint256 inputAmount, address inputContractAddress) = unpack(packedInput); (uint256 outputAmount, address outputContractAddress) = unpack(packedOutput); Signature memory theSignature; { // Directly from https://eips.ethereum.org/EIPS/eip-2098 bytes32 s = vs & 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff; uint8 v = 27 + uint8(uint256(vs) >> 255); theSignature = Signature(v,r,s); } if(performTransfer && (inputContractAddress!=CLIPPER_ETH_SIGIL)) { IERC20(inputContractAddress).safeTransferFrom(msg.sender, address(this), inputAmount); } performUnpackedSwap(inputContractAddress, outputContractAddress, inputAmount, outputAmount, packedGoodUntil, auxData, theSignature); } function performUnpackedSwap(address inputContractAddress, address outputContractAddress, uint256 inputAmount, uint256 outputAmount, uint256 packedGoodUntil, bytes32 auxData, Signature memory theSignature) internal { address destinationAddress = address(uint160(uint256(auxData))); bytes memory auxiliaryData = abi.encodePacked(auxData >> 40); if(inputContractAddress==CLIPPER_ETH_SIGIL) { this.sellEthForToken(outputContractAddress, inputAmount, outputAmount, packedGoodUntil, destinationAddress, theSignature, auxiliaryData); } else if(outputContractAddress==CLIPPER_ETH_SIGIL) { this.sellTokenForEth(inputContractAddress, inputAmount, outputAmount, packedGoodUntil, destinationAddress, theSignature, auxiliaryData); } else { this.swap(inputContractAddress, outputContractAddress, inputAmount, outputAmount, packedGoodUntil, destinationAddress, theSignature, auxiliaryData); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
//SPDX-License-Identifier: Copyright 2022 Shipyard Software, Inc. pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "./ClipperCommonExchange.sol"; abstract contract ClipperCommonPacked is ClipperCommonExchange { using SafeERC20 for IERC20; /* unpack: internal function to unpack uint256 representation Input arguments: amountAndAddress: uint256 where first 24 hexchars are a uint96 shortened uint256 and last 40 hexchars are an address Returns: unpacked amount and address */ function unpack(uint256 amountAndAddress) internal pure returns (uint256 amount, address contractAddress) { // uint256 -> uint160 automatically takes just last 40 hexchars contractAddress = address(uint160(amountAndAddress)); // shift over the 40 hexchars to capture the amount amount = amountAndAddress >> 160; } function unpackAndSwap(uint256 packedInput, uint256 packedOutput, uint256 packedDestination, bytes32 auxData, bytes32 r, bytes32 vs, bool performTransfer) internal virtual; // external function to transfer tokens and perform swap from packed calldata function packedTransmitAndSwap(uint256 packedInput, uint256 packedOutput, uint256 packedDestination, bytes32 auxData, bytes32 r, bytes32 vs) external payable { unpackAndSwap(packedInput, packedOutput, packedDestination, auxData, r, vs, true); } // external function to perform swap from packed calldata function packedSwap(uint256 packedInput, uint256 packedOutput, uint256 packedDestination, bytes32 auxData, bytes32 r, bytes32 vs) external payable { unpackAndSwap(packedInput, packedOutput, packedDestination, auxData, r, vs, false); } /* packedTransmitAndDepositOneAsset: deposit a single asset in a calldata-efficient way Input arguments: packedInput: Amount and contract address of asset to deposit packedConfig: First 32 hexchars are poolTokens, next 24 are goodUntil, next 6 are nDays, final 2 are v r, s: Signature values */ function packedTransmitAndDepositOneAsset(uint256 packedInput, uint256 packedConfig, bytes32 r, bytes32 s) external payable { (uint256 inputAmount, address inputContractAddress) = unpack(packedInput); uint256 poolTokens = packedConfig >> 128; uint256 goodUntil = uint256(uint96(packedConfig >> 32)); uint256 nDays = uint256(uint24(packedConfig >> 8)); uint8 v = uint8(packedConfig); bool inputIsRawEth = (inputContractAddress==CLIPPER_ETH_SIGIL); Signature memory theSignature = Signature(v,r,s); delete v; if(inputIsRawEth){ // Don't need to wrap the ETH here, do it in the deposit function inputContractAddress = WRAPPER_CONTRACT; } else { IERC20(inputContractAddress).safeTransferFrom(msg.sender, address(this), inputAmount); } uint i = 0; uint n = nTokens(); uint256[] memory depositAmounts = new uint256[](n); while(i < n){ depositAmounts[i] = (tokenAt(i) == inputContractAddress) ? inputAmount : 0; i++; } // Have to use delegatecall to preserve msg.sender context (bool success, ) = address(this).delegatecall( abi.encodeWithSignature( "deposit(address,uint256[],uint256,uint256,uint256,(uint8,bytes32,bytes32))", msg.sender, depositAmounts, nDays, poolTokens, goodUntil, theSignature)); require(success, "Clipper: Deposit failed"); } }
//SPDX-License-Identifier: Copyright 2022 Shipyard Software, Inc. pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import "@openzeppelin/contracts/utils/math/SafeCast.sol"; import "@prb/math/contracts/PRBMathSD59x18.sol"; import "./ClipperDirectExchange.sol"; contract ClipperVerifiedExchange is ClipperDirectExchange { using PRBMathSD59x18 for int256; using SafeCast for uint256; using SafeCast for int256; uint256 constant ONE_IN_DEFAULT_DECIMALS = 1e18; uint256 constant ONE_IN_PRICE_DECIMALS = 1e8; struct UtilStruct { uint256 qX; uint256 qY; uint256 decimalMultiplierX; uint256 decimalMultiplierY; } constructor(address theSigner, address theWrapper, address[] memory tokens) ClipperDirectExchange(theSigner, theWrapper, tokens) {} function sellTokenForEth(address inputToken, uint256 inputAmount, uint256 outputAmount, uint256 packedGoodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external override { (uint256 actualInput, uint256 fairOutput) = verifyTokensAndGetAmounts(inputToken, WRAPPER_CONTRACT, inputAmount, outputAmount); uint256 goodUntil = unpackAndCheckInvariant(inputToken, actualInput, WRAPPER_CONTRACT, fairOutput, packedGoodUntil); bytes32 digest = createSwapDigest(inputToken, WRAPPER_CONTRACT, inputAmount, outputAmount, packedGoodUntil, destinationAddress); // Revert if it's signed by the wrong address verifyDigestSignature(digest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(digest, goodUntil); // We have to _sync the input token manually here _sync(inputToken); unwrapAndForwardEth(destinationAddress, fairOutput); emit Swapped(inputToken, WRAPPER_CONTRACT, destinationAddress, actualInput, fairOutput, auxiliaryData); } function swap(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 packedGoodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) public override { // Revert if the tokens don't exist (uint256 actualInput, uint256 fairOutput) = verifyTokensAndGetAmounts(inputToken, outputToken, inputAmount, outputAmount); uint256 goodUntil = unpackAndCheckInvariant(inputToken, actualInput, outputToken, fairOutput, packedGoodUntil); bytes32 digest = createSwapDigest(inputToken, outputToken, inputAmount, outputAmount, packedGoodUntil, destinationAddress); // Revert if it's signed by the wrong address verifyDigestSignature(digest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(digest, goodUntil); // OK, now we are safe to transfer syncAndTransfer(inputToken, outputToken, destinationAddress, fairOutput); emit Swapped(inputToken, outputToken, destinationAddress, actualInput, fairOutput, auxiliaryData); } function unpackAndCheckInvariant(address inputToken, uint256 inputAmount, address outputToken, uint256 outputAmount, uint256 packedGoodUntil) internal view returns (uint256) { UtilStruct memory s; (uint256 pX, uint256 pY,uint256 wX, uint256 wY, uint256 k) = unpackGoodUntil(packedGoodUntil); s.qX = lastBalances[inputToken]; s.qY = lastBalances[outputToken]; s.decimalMultiplierX = 10**(18 - IERC20Metadata(inputToken).decimals()); s.decimalMultiplierY = 10**(18 - IERC20Metadata(outputToken).decimals()); require(swapIncreasesInvariant(inputAmount * s.decimalMultiplierX, pX, s.qX * s.decimalMultiplierX, wX, outputAmount * s.decimalMultiplierY, pY, s.qY * s.decimalMultiplierY, wY, k), "Invariant check failed"); return uint256(uint32(packedGoodUntil)); } function unpackGoodUntil(uint256 packedGoodUntil) public pure returns (uint256 pX, uint256 pY, uint256 wX, uint256 wY, uint256 k) { /* * Input asset price in 8 decimals - uint64 * Output asset price in 8 decimals - uint64 * k value in 18 decimals - uint64 * Input asset weight - uint16 * Output asset weight - uint16 * Current good until value - uint32 - can be taken as uint256(uint32(packedGoodUntil)) */ // goodUntil = uint256(uint32(packedGoodUntil)); packedGoodUntil = packedGoodUntil >> 32; wY = uint256(uint16(packedGoodUntil)); packedGoodUntil = packedGoodUntil >> 16; wX = uint256(uint16(packedGoodUntil)); packedGoodUntil = packedGoodUntil >> 16; k = uint256(uint64(packedGoodUntil)); packedGoodUntil = packedGoodUntil >> 64; pY = uint256(uint64(packedGoodUntil)); packedGoodUntil = packedGoodUntil >> 64; pX = uint256(uint64(packedGoodUntil)); } /* Before calling: Set qX = lastBalances[inAsset]; Set qY = lastBalances[outAsset]; Multiply all quantities (q and in/out) by 10**(18-asset.decimals()). This puts all quantities in 18 decimals. Assumed decimals: K: 18 Quantities: 18 (ONE_IN_DEFAULT_DECIMALS = 1e18) Prices: 8 (ONE_IN_PRICE_DECIMALS = 1e8) Weights: 0 (100 = 100) */ function swapIncreasesInvariant(uint256 inX, uint256 pX, uint256 qX, uint256 wX, uint256 outY, uint256 pY, uint256 qY, uint256 wY, uint256 k) internal pure returns (bool) { uint256 invariantBefore; uint256 invariantAfter; { uint256 pqX = pX * qX / ONE_IN_PRICE_DECIMALS; uint256 pqwXk = fractionalPow(pqX * wX, k); if (pqwXk > 0) { invariantBefore += (ONE_IN_DEFAULT_DECIMALS * pqX) / pqwXk; } uint256 pqY = pY * qY / ONE_IN_PRICE_DECIMALS; uint256 pqwYk = fractionalPow(pqY * wY, k); if (pqwYk > 0) { invariantBefore += (ONE_IN_DEFAULT_DECIMALS * pqY) / pqwYk; } } { uint256 pqXinX = (pX * (qX + inX)) / ONE_IN_PRICE_DECIMALS; uint256 pqwXinXk = fractionalPow(pqXinX * wX, k); if (pqwXinXk > 0) { invariantAfter += (ONE_IN_DEFAULT_DECIMALS * pqXinX) / pqwXinXk; } uint256 pqYoutY = pY * (qY - outY) / ONE_IN_PRICE_DECIMALS; uint256 pqwYoutYk = fractionalPow(pqYoutY * wY, k); if (pqwYoutYk > 0) { invariantAfter += (ONE_IN_DEFAULT_DECIMALS * pqYoutY) / pqwYoutYk; } } return invariantAfter > invariantBefore; } function fractionalPow(uint256 input, uint256 pow) internal pure returns (uint256) { if (input == 0) { return 0; } else { // input^(pow/1e18) -> exp2( (pow * log2( input ) / 1e18 ) ) return exp2((int256(pow) * log2(input.toInt256())) / int256(ONE_IN_DEFAULT_DECIMALS)); } } function exp2(int256 x) internal pure returns (uint256) { return x.exp2().toUint256(); } function log2(int256 x) internal pure returns (int256 y) { y = x.log2(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
//SPDX-License-Identifier: Copyright 2021 Shipyard Software, Inc. pragma solidity ^0.8.0; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"; import "./interfaces/WrapperContractInterface.sol"; abstract contract ClipperCommonExchange is ERC20, ReentrancyGuard { using SafeERC20 for IERC20; using EnumerableSet for EnumerableSet.AddressSet; struct Signature { uint8 v; bytes32 r; bytes32 s; } struct Deposit { uint lockedUntil; uint256 poolTokenAmount; } uint256 constant ONE_IN_TEN_DECIMALS = 1e10; // Allow for inputs up to 0.5% more than quoted values to have scaled output. // Inputs higher than this value just get 0.5% more. uint256 constant MAX_ALLOWED_OVER_TEN_DECIMALS = ONE_IN_TEN_DECIMALS+50*1e6; // Signer is passed in on construction, hence "immutable" address immutable public DESIGNATED_SIGNER; address immutable public WRAPPER_CONTRACT; // Constant values for EIP-712 signing bytes32 immutable DOMAIN_SEPARATOR; string constant VERSION = "1.0.0"; string constant NAME = "ClipperDirect"; address constant CLIPPER_ETH_SIGIL = address(0); bytes32 constant EIP712DOMAIN_TYPEHASH = keccak256( abi.encodePacked("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)") ); bytes32 constant OFFERSTRUCT_TYPEHASH = keccak256( abi.encodePacked("OfferStruct(address input_token,address output_token,uint256 input_amount,uint256 output_amount,uint256 good_until,address destination_address)") ); bytes32 constant DEPOSITSTRUCT_TYPEHASH = keccak256( abi.encodePacked("DepositStruct(address sender,uint256[] deposit_amounts,uint256 days_locked,uint256 pool_tokens,uint256 good_until)") ); bytes32 constant SINGLEDEPOSITSTRUCT_TYPEHASH = keccak256( abi.encodePacked("SingleDepositStruct(address sender,address token,uint256 amount,uint256 days_locked,uint256 pool_tokens,uint256 good_until)") ); bytes32 constant WITHDRAWALSTRUCT_TYPEHASH = keccak256( abi.encodePacked("WithdrawalStruct(address token_holder,uint256 pool_token_amount_to_burn,address asset_address,uint256 asset_amount,uint256 good_until)") ); // Assets // lastBalances: used for "transmit then swap then sync" modality // assetSet is a set of keys that have lastBalances mapping(address => uint256) public lastBalances; EnumerableSet.AddressSet assetSet; // Allows lookup mapping(address => Deposit) public vestingDeposits; // Events event Swapped( address indexed inAsset, address indexed outAsset, address indexed recipient, uint256 inAmount, uint256 outAmount, bytes auxiliaryData ); event Deposited( address indexed depositor, uint256 poolTokens, uint256 nDays ); event Withdrawn( address indexed withdrawer, uint256 poolTokens, uint256 fractionOfPool ); event AssetWithdrawn( address indexed withdrawer, uint256 poolTokens, address indexed assetAddress, uint256 assetAmount ); // Take in the designated signer address and the token list constructor(address theSigner, address theWrapper, address[] memory tokens) ERC20("ClipperDirect Pool Token", "CLPRDRPL") { DESIGNATED_SIGNER = theSigner; uint i; uint n = tokens.length; while(i < n) { assetSet.add(tokens[i]); i++; } DOMAIN_SEPARATOR = createDomainSeparator(NAME, VERSION, address(this)); WRAPPER_CONTRACT = theWrapper; } // Allows the receipt of ETH directly receive() external payable { } function safeEthSend(address recipient, uint256 howMuch) internal { (bool success, ) = payable(recipient).call{value: howMuch}(""); require(success, "Call with value failed"); } /* TOKEN AND ASSET FUNCTIONS */ function nTokens() public view returns (uint) { return assetSet.length(); } function tokenAt(uint i) public view returns (address) { return assetSet.at(i); } function isToken(address token) public view returns (bool) { return assetSet.contains(token); } function _sync(address token) internal virtual; // Can be overridden as in Caravel function getLastBalance(address token) public view virtual returns (uint256) { return lastBalances[token]; } function allTokensBalance() external view returns (uint256[] memory, address[] memory, uint256){ uint n = nTokens(); uint256[] memory balances = new uint256[](n); address[] memory tokens = new address[](n); for (uint i = 0; i < n; i++) { address token = tokenAt(i); balances[i] = getLastBalance(token); tokens[i] = token; } return (balances, tokens, totalSupply()); } // nonReentrant asset transfer function transferAsset(address token, address recipient, uint256 amount) internal nonReentrant { IERC20(token).safeTransfer(recipient, amount); // We never want to transfer an asset without sync'ing _sync(token); } function calculateFairOutput(uint256 statedInput, uint256 actualInput, uint256 statedOutput) internal pure returns (uint256) { if(actualInput == statedInput) { return statedOutput; } else { uint256 theFraction = (ONE_IN_TEN_DECIMALS*actualInput)/statedInput; if(theFraction >= MAX_ALLOWED_OVER_TEN_DECIMALS) { return (MAX_ALLOWED_OVER_TEN_DECIMALS*statedOutput)/ONE_IN_TEN_DECIMALS; } else { return (theFraction*statedOutput)/ONE_IN_TEN_DECIMALS; } } } /* DEPOSIT FUNCTIONALITY */ function canUnlockDeposit(address theAddress) public view returns (bool) { Deposit storage myDeposit = vestingDeposits[theAddress]; return (myDeposit.poolTokenAmount > 0) && (myDeposit.lockedUntil <= block.timestamp); } function unlockDeposit() external returns (uint256 poolTokens) { require(canUnlockDeposit(msg.sender), "ClipperDirect: Deposit cannot be unlocked"); poolTokens = vestingDeposits[msg.sender].poolTokenAmount; delete vestingDeposits[msg.sender]; _transfer(address(this), msg.sender, poolTokens); } function _mintOrVesting(address sender, uint256 nDays, uint256 poolTokens) internal { if(nDays==0){ // No vesting period required - mint tokens directly for the user _mint(sender, poolTokens); } else { // Set up a vesting deposit for the sender _createVestingDeposit(sender, nDays, poolTokens); } } // Mints tokens to this contract to hold for vesting function _createVestingDeposit(address theAddress, uint256 nDays, uint256 numPoolTokens) internal { require(nDays > 0, "ClipperDirect: Cannot create vesting deposit without positive vesting period"); require(vestingDeposits[theAddress].poolTokenAmount==0, "ClipperDirect: Depositor already has an active deposit"); Deposit memory myDeposit = Deposit({ lockedUntil: block.timestamp + (nDays * 1 days), poolTokenAmount: numPoolTokens }); vestingDeposits[theAddress] = myDeposit; _mint(address(this), numPoolTokens); } function transmitAndDeposit(uint256[] calldata depositAmounts, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) external { uint i=0; uint n = depositAmounts.length; while(i < n){ uint256 transferAmount = depositAmounts[i]; if(transferAmount > 0){ IERC20(tokenAt(i)).safeTransferFrom(msg.sender, address(this), transferAmount); } i++; } deposit(msg.sender, depositAmounts, nDays, poolTokens, goodUntil, theSignature); } function transmitAndDepositSingleAsset(address inputToken, uint256 inputAmount, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) external virtual; function deposit(address sender, uint256[] calldata depositAmounts, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) public payable virtual; function depositSingleAsset(address sender, address inputToken, uint256 inputAmount, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) public payable virtual; /* WITHDRAWAL FUNCTIONALITY */ function _proportionalWithdrawal(uint256 myFraction) internal { uint256 toTransfer; uint i; uint n = nTokens(); while(i < n) { address theToken = tokenAt(i); toTransfer = (myFraction*getLastBalance(theToken)) / ONE_IN_TEN_DECIMALS; // syncs done automatically on transfer transferAsset(theToken, msg.sender, toTransfer); i++; } } function burnToWithdraw(uint256 amount) external { // Capture the fraction first, before burning uint256 theFractionBaseTen = (ONE_IN_TEN_DECIMALS*amount)/totalSupply(); // Reverts if balance is insufficient _burn(msg.sender, amount); _proportionalWithdrawal(theFractionBaseTen); emit Withdrawn(msg.sender, amount, theFractionBaseTen); } function withdrawSingleAsset(address tokenHolder, uint256 poolTokenAmountToBurn, address assetAddress, uint256 assetAmount, uint256 goodUntil, Signature calldata theSignature) external virtual; /* SWAP Functionality: Virtual */ function sellEthForToken(address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external payable virtual; function sellTokenForEth(address inputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external virtual; function transmitAndSellTokenForEth(address inputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external virtual; function transmitAndSwap(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external virtual; function swap(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) public virtual; /* SIGNING Functionality */ function createDomainSeparator(string memory name, string memory version, address theSigner) internal view returns (bytes32) { return keccak256(abi.encode( EIP712DOMAIN_TYPEHASH, keccak256(abi.encodePacked(name)), keccak256(abi.encodePacked(version)), uint256(block.chainid), theSigner )); } function hashInputOffer(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress) internal pure returns (bytes32) { return keccak256(abi.encode( OFFERSTRUCT_TYPEHASH, inputToken, outputToken, inputAmount, outputAmount, goodUntil, destinationAddress )); } function hashDeposit(address sender, uint256[] calldata depositAmounts, uint256 daysLocked, uint256 poolTokens, uint256 goodUntil) internal pure returns (bytes32) { bytes32 depositAmountsHash = keccak256(abi.encodePacked(depositAmounts)); return keccak256(abi.encode( DEPOSITSTRUCT_TYPEHASH, sender, depositAmountsHash, daysLocked, poolTokens, goodUntil )); } function hashSingleDeposit(address sender, address inputToken, uint256 inputAmount, uint256 daysLocked, uint256 poolTokens, uint256 goodUntil) internal pure returns (bytes32) { return keccak256(abi.encode( SINGLEDEPOSITSTRUCT_TYPEHASH, sender, inputToken, inputAmount, daysLocked, poolTokens, goodUntil )); } function hashWithdrawal(address tokenHolder, uint256 poolTokenAmountToBurn, address assetAddress, uint256 assetAmount, uint256 goodUntil) internal pure returns (bytes32) { return keccak256(abi.encode( WITHDRAWALSTRUCT_TYPEHASH, tokenHolder, poolTokenAmountToBurn, assetAddress, assetAmount, goodUntil )); } function createSwapDigest(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress) internal view returns (bytes32 digest){ bytes32 hashedInput = hashInputOffer(inputToken, outputToken, inputAmount, outputAmount, goodUntil, destinationAddress); digest = ECDSA.toTypedDataHash(DOMAIN_SEPARATOR, hashedInput); } function createDepositDigest(address sender, uint256[] calldata depositAmounts, uint256 nDays, uint256 poolTokens, uint256 goodUntil) internal view returns (bytes32 depositDigest){ bytes32 hashedInput = hashDeposit(sender, depositAmounts, nDays, poolTokens, goodUntil); depositDigest = ECDSA.toTypedDataHash(DOMAIN_SEPARATOR, hashedInput); } function createSingleDepositDigest(address sender, address inputToken, uint256 inputAmount, uint256 nDays, uint256 poolTokens, uint256 goodUntil) internal view returns (bytes32 depositDigest){ bytes32 hashedInput = hashSingleDeposit(sender, inputToken, inputAmount, nDays, poolTokens, goodUntil); depositDigest = ECDSA.toTypedDataHash(DOMAIN_SEPARATOR, hashedInput); } function createWithdrawalDigest(address tokenHolder, uint256 poolTokenAmountToBurn, address assetAddress, uint256 assetAmount, uint256 goodUntil) internal view returns (bytes32 withdrawalDigest){ bytes32 hashedInput = hashWithdrawal(tokenHolder, poolTokenAmountToBurn, assetAddress, assetAmount, goodUntil); withdrawalDigest = ECDSA.toTypedDataHash(DOMAIN_SEPARATOR, hashedInput); } function verifyDigestSignature(bytes32 theDigest, Signature calldata theSignature) internal view { address signingAddress = ecrecover(theDigest, theSignature.v, theSignature.r, theSignature.s); require(signingAddress==DESIGNATED_SIGNER, "Message signed by incorrect address"); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Address.sol) pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol) pragma solidity ^0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; if (lastIndex != toDeleteIndex) { bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { return set._values[index]; } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function _values(Set storage set) private view returns (bytes32[] memory) { return set._values; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(Bytes32Set storage set) internal view returns (bytes32[] memory) { return _values(set._inner); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(AddressSet storage set) internal view returns (address[] memory) { bytes32[] memory store = _values(set._inner); address[] memory result; assembly { result := store } return result; } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(UintSet storage set) internal view returns (uint256[] memory) { bytes32[] memory store = _values(set._inner); uint256[] memory result; assembly { result := store } return result; } }
//SPDX-License-Identifier: Copyright 2021 Shipyard Software, Inc. pragma solidity ^0.8.0; interface WrapperContractInterface { function withdraw(uint256 amount) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/math/SafeCast.sol) pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits. */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128) { require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits"); return int128(value); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64) { require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits"); return int64(value); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32) { require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits"); return int32(value); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16) { require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits"); return int16(value); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits. * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8) { require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits"); return int8(value); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: Unlicense pragma solidity >=0.8.4; import "./PRBMath.sol"; /// @title PRBMathSD59x18 /// @author Paul Razvan Berg /// @notice Smart contract library for advanced fixed-point math that works with int256 numbers considered to have 18 /// trailing decimals. We call this number representation signed 59.18-decimal fixed-point, since the numbers can have /// a sign and there can be up to 59 digits in the integer part and up to 18 decimals in the fractional part. The numbers /// are bound by the minimum and the maximum values permitted by the Solidity type int256. library PRBMathSD59x18 { /// @dev log2(e) as a signed 59.18-decimal fixed-point number. int256 internal constant LOG2_E = 1_442695040888963407; /// @dev Half the SCALE number. int256 internal constant HALF_SCALE = 5e17; /// @dev The maximum value a signed 59.18-decimal fixed-point number can have. int256 internal constant MAX_SD59x18 = 57896044618658097711785492504343953926634992332820282019728_792003956564819967; /// @dev The maximum whole value a signed 59.18-decimal fixed-point number can have. int256 internal constant MAX_WHOLE_SD59x18 = 57896044618658097711785492504343953926634992332820282019728_000000000000000000; /// @dev The minimum value a signed 59.18-decimal fixed-point number can have. int256 internal constant MIN_SD59x18 = -57896044618658097711785492504343953926634992332820282019728_792003956564819968; /// @dev The minimum whole value a signed 59.18-decimal fixed-point number can have. int256 internal constant MIN_WHOLE_SD59x18 = -57896044618658097711785492504343953926634992332820282019728_000000000000000000; /// @dev How many trailing decimals can be represented. int256 internal constant SCALE = 1e18; /// INTERNAL FUNCTIONS /// /// @notice Calculate the absolute value of x. /// /// @dev Requirements: /// - x must be greater than MIN_SD59x18. /// /// @param x The number to calculate the absolute value for. /// @param result The absolute value of x. function abs(int256 x) internal pure returns (int256 result) { unchecked { if (x == MIN_SD59x18) { revert PRBMathSD59x18__AbsInputTooSmall(); } result = x < 0 ? -x : x; } } /// @notice Calculates the arithmetic average of x and y, rounding down. /// @param x The first operand as a signed 59.18-decimal fixed-point number. /// @param y The second operand as a signed 59.18-decimal fixed-point number. /// @return result The arithmetic average as a signed 59.18-decimal fixed-point number. function avg(int256 x, int256 y) internal pure returns (int256 result) { // The operations can never overflow. unchecked { int256 sum = (x >> 1) + (y >> 1); if (sum < 0) { // If at least one of x and y is odd, we add 1 to the result. This is because shifting negative numbers to the // right rounds down to infinity. assembly { result := add(sum, and(or(x, y), 1)) } } else { // If both x and y are odd, we add 1 to the result. This is because if both numbers are odd, the 0.5 // remainder gets truncated twice. result = sum + (x & y & 1); } } } /// @notice Yields the least greatest signed 59.18 decimal fixed-point number greater than or equal to x. /// /// @dev Optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional counterparts. /// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions. /// /// Requirements: /// - x must be less than or equal to MAX_WHOLE_SD59x18. /// /// @param x The signed 59.18-decimal fixed-point number to ceil. /// @param result The least integer greater than or equal to x, as a signed 58.18-decimal fixed-point number. function ceil(int256 x) internal pure returns (int256 result) { if (x > MAX_WHOLE_SD59x18) { revert PRBMathSD59x18__CeilOverflow(x); } unchecked { int256 remainder = x % SCALE; if (remainder == 0) { result = x; } else { // Solidity uses C fmod style, which returns a modulus with the same sign as x. result = x - remainder; if (x > 0) { result += SCALE; } } } } /// @notice Divides two signed 59.18-decimal fixed-point numbers, returning a new signed 59.18-decimal fixed-point number. /// /// @dev Variant of "mulDiv" that works with signed numbers. Works by computing the signs and the absolute values separately. /// /// Requirements: /// - All from "PRBMath.mulDiv". /// - None of the inputs can be MIN_SD59x18. /// - The denominator cannot be zero. /// - The result must fit within int256. /// /// Caveats: /// - All from "PRBMath.mulDiv". /// /// @param x The numerator as a signed 59.18-decimal fixed-point number. /// @param y The denominator as a signed 59.18-decimal fixed-point number. /// @param result The quotient as a signed 59.18-decimal fixed-point number. function div(int256 x, int256 y) internal pure returns (int256 result) { if (x == MIN_SD59x18 || y == MIN_SD59x18) { revert PRBMathSD59x18__DivInputTooSmall(); } // Get hold of the absolute values of x and y. uint256 ax; uint256 ay; unchecked { ax = x < 0 ? uint256(-x) : uint256(x); ay = y < 0 ? uint256(-y) : uint256(y); } // Compute the absolute value of (x*SCALE)÷y. The result must fit within int256. uint256 rAbs = PRBMath.mulDiv(ax, uint256(SCALE), ay); if (rAbs > uint256(MAX_SD59x18)) { revert PRBMathSD59x18__DivOverflow(rAbs); } // Get the signs of x and y. uint256 sx; uint256 sy; assembly { sx := sgt(x, sub(0, 1)) sy := sgt(y, sub(0, 1)) } // XOR over sx and sy. This is basically checking whether the inputs have the same sign. If yes, the result // should be positive. Otherwise, it should be negative. result = sx ^ sy == 1 ? -int256(rAbs) : int256(rAbs); } /// @notice Returns Euler's number as a signed 59.18-decimal fixed-point number. /// @dev See https://en.wikipedia.org/wiki/E_(mathematical_constant). function e() internal pure returns (int256 result) { result = 2_718281828459045235; } /// @notice Calculates the natural exponent of x. /// /// @dev Based on the insight that e^x = 2^(x * log2(e)). /// /// Requirements: /// - All from "log2". /// - x must be less than 133.084258667509499441. /// /// Caveats: /// - All from "exp2". /// - For any x less than -41.446531673892822322, the result is zero. /// /// @param x The exponent as a signed 59.18-decimal fixed-point number. /// @return result The result as a signed 59.18-decimal fixed-point number. function exp(int256 x) internal pure returns (int256 result) { // Without this check, the value passed to "exp2" would be less than -59.794705707972522261. if (x < -41_446531673892822322) { return 0; } // Without this check, the value passed to "exp2" would be greater than 192. if (x >= 133_084258667509499441) { revert PRBMathSD59x18__ExpInputTooBig(x); } // Do the fixed-point multiplication inline to save gas. unchecked { int256 doubleScaleProduct = x * LOG2_E; result = exp2((doubleScaleProduct + HALF_SCALE) / SCALE); } } /// @notice Calculates the binary exponent of x using the binary fraction method. /// /// @dev See https://ethereum.stackexchange.com/q/79903/24693. /// /// Requirements: /// - x must be 192 or less. /// - The result must fit within MAX_SD59x18. /// /// Caveats: /// - For any x less than -59.794705707972522261, the result is zero. /// /// @param x The exponent as a signed 59.18-decimal fixed-point number. /// @return result The result as a signed 59.18-decimal fixed-point number. function exp2(int256 x) internal pure returns (int256 result) { // This works because 2^(-x) = 1/2^x. if (x < 0) { // 2^59.794705707972522262 is the maximum number whose inverse does not truncate down to zero. if (x < -59_794705707972522261) { return 0; } // Do the fixed-point inversion inline to save gas. The numerator is SCALE * SCALE. unchecked { result = 1e36 / exp2(-x); } } else { // 2^192 doesn't fit within the 192.64-bit format used internally in this function. if (x >= 192e18) { revert PRBMathSD59x18__Exp2InputTooBig(x); } unchecked { // Convert x to the 192.64-bit fixed-point format. uint256 x192x64 = (uint256(x) << 64) / uint256(SCALE); // Safe to convert the result to int256 directly because the maximum input allowed is 192. result = int256(PRBMath.exp2(x192x64)); } } } /// @notice Yields the greatest signed 59.18 decimal fixed-point number less than or equal to x. /// /// @dev Optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional counterparts. /// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions. /// /// Requirements: /// - x must be greater than or equal to MIN_WHOLE_SD59x18. /// /// @param x The signed 59.18-decimal fixed-point number to floor. /// @param result The greatest integer less than or equal to x, as a signed 58.18-decimal fixed-point number. function floor(int256 x) internal pure returns (int256 result) { if (x < MIN_WHOLE_SD59x18) { revert PRBMathSD59x18__FloorUnderflow(x); } unchecked { int256 remainder = x % SCALE; if (remainder == 0) { result = x; } else { // Solidity uses C fmod style, which returns a modulus with the same sign as x. result = x - remainder; if (x < 0) { result -= SCALE; } } } } /// @notice Yields the excess beyond the floor of x for positive numbers and the part of the number to the right /// of the radix point for negative numbers. /// @dev Based on the odd function definition. https://en.wikipedia.org/wiki/Fractional_part /// @param x The signed 59.18-decimal fixed-point number to get the fractional part of. /// @param result The fractional part of x as a signed 59.18-decimal fixed-point number. function frac(int256 x) internal pure returns (int256 result) { unchecked { result = x % SCALE; } } /// @notice Converts a number from basic integer form to signed 59.18-decimal fixed-point representation. /// /// @dev Requirements: /// - x must be greater than or equal to MIN_SD59x18 divided by SCALE. /// - x must be less than or equal to MAX_SD59x18 divided by SCALE. /// /// @param x The basic integer to convert. /// @param result The same number in signed 59.18-decimal fixed-point representation. function fromInt(int256 x) internal pure returns (int256 result) { unchecked { if (x < MIN_SD59x18 / SCALE) { revert PRBMathSD59x18__FromIntUnderflow(x); } if (x > MAX_SD59x18 / SCALE) { revert PRBMathSD59x18__FromIntOverflow(x); } result = x * SCALE; } } /// @notice Calculates geometric mean of x and y, i.e. sqrt(x * y), rounding down. /// /// @dev Requirements: /// - x * y must fit within MAX_SD59x18, lest it overflows. /// - x * y cannot be negative. /// /// @param x The first operand as a signed 59.18-decimal fixed-point number. /// @param y The second operand as a signed 59.18-decimal fixed-point number. /// @return result The result as a signed 59.18-decimal fixed-point number. function gm(int256 x, int256 y) internal pure returns (int256 result) { if (x == 0) { return 0; } unchecked { // Checking for overflow this way is faster than letting Solidity do it. int256 xy = x * y; if (xy / x != y) { revert PRBMathSD59x18__GmOverflow(x, y); } // The product cannot be negative. if (xy < 0) { revert PRBMathSD59x18__GmNegativeProduct(x, y); } // We don't need to multiply by the SCALE here because the x*y product had already picked up a factor of SCALE // during multiplication. See the comments within the "sqrt" function. result = int256(PRBMath.sqrt(uint256(xy))); } } /// @notice Calculates 1 / x, rounding toward zero. /// /// @dev Requirements: /// - x cannot be zero. /// /// @param x The signed 59.18-decimal fixed-point number for which to calculate the inverse. /// @return result The inverse as a signed 59.18-decimal fixed-point number. function inv(int256 x) internal pure returns (int256 result) { unchecked { // 1e36 is SCALE * SCALE. result = 1e36 / x; } } /// @notice Calculates the natural logarithm of x. /// /// @dev Based on the insight that ln(x) = log2(x) / log2(e). /// /// Requirements: /// - All from "log2". /// /// Caveats: /// - All from "log2". /// - This doesn't return exactly 1 for 2718281828459045235, for that we would need more fine-grained precision. /// /// @param x The signed 59.18-decimal fixed-point number for which to calculate the natural logarithm. /// @return result The natural logarithm as a signed 59.18-decimal fixed-point number. function ln(int256 x) internal pure returns (int256 result) { // Do the fixed-point multiplication inline to save gas. This is overflow-safe because the maximum value that log2(x) // can return is 195205294292027477728. unchecked { result = (log2(x) * SCALE) / LOG2_E; } } /// @notice Calculates the common logarithm of x. /// /// @dev First checks if x is an exact power of ten and it stops if yes. If it's not, calculates the common /// logarithm based on the insight that log10(x) = log2(x) / log2(10). /// /// Requirements: /// - All from "log2". /// /// Caveats: /// - All from "log2". /// /// @param x The signed 59.18-decimal fixed-point number for which to calculate the common logarithm. /// @return result The common logarithm as a signed 59.18-decimal fixed-point number. function log10(int256 x) internal pure returns (int256 result) { if (x <= 0) { revert PRBMathSD59x18__LogInputTooSmall(x); } // Note that the "mul" in this block is the assembly mul operation, not the "mul" function defined in this contract. // prettier-ignore assembly { switch x case 1 { result := mul(SCALE, sub(0, 18)) } case 10 { result := mul(SCALE, sub(1, 18)) } case 100 { result := mul(SCALE, sub(2, 18)) } case 1000 { result := mul(SCALE, sub(3, 18)) } case 10000 { result := mul(SCALE, sub(4, 18)) } case 100000 { result := mul(SCALE, sub(5, 18)) } case 1000000 { result := mul(SCALE, sub(6, 18)) } case 10000000 { result := mul(SCALE, sub(7, 18)) } case 100000000 { result := mul(SCALE, sub(8, 18)) } case 1000000000 { result := mul(SCALE, sub(9, 18)) } case 10000000000 { result := mul(SCALE, sub(10, 18)) } case 100000000000 { result := mul(SCALE, sub(11, 18)) } case 1000000000000 { result := mul(SCALE, sub(12, 18)) } case 10000000000000 { result := mul(SCALE, sub(13, 18)) } case 100000000000000 { result := mul(SCALE, sub(14, 18)) } case 1000000000000000 { result := mul(SCALE, sub(15, 18)) } case 10000000000000000 { result := mul(SCALE, sub(16, 18)) } case 100000000000000000 { result := mul(SCALE, sub(17, 18)) } case 1000000000000000000 { result := 0 } case 10000000000000000000 { result := SCALE } case 100000000000000000000 { result := mul(SCALE, 2) } case 1000000000000000000000 { result := mul(SCALE, 3) } case 10000000000000000000000 { result := mul(SCALE, 4) } case 100000000000000000000000 { result := mul(SCALE, 5) } case 1000000000000000000000000 { result := mul(SCALE, 6) } case 10000000000000000000000000 { result := mul(SCALE, 7) } case 100000000000000000000000000 { result := mul(SCALE, 8) } case 1000000000000000000000000000 { result := mul(SCALE, 9) } case 10000000000000000000000000000 { result := mul(SCALE, 10) } case 100000000000000000000000000000 { result := mul(SCALE, 11) } case 1000000000000000000000000000000 { result := mul(SCALE, 12) } case 10000000000000000000000000000000 { result := mul(SCALE, 13) } case 100000000000000000000000000000000 { result := mul(SCALE, 14) } case 1000000000000000000000000000000000 { result := mul(SCALE, 15) } case 10000000000000000000000000000000000 { result := mul(SCALE, 16) } case 100000000000000000000000000000000000 { result := mul(SCALE, 17) } case 1000000000000000000000000000000000000 { result := mul(SCALE, 18) } case 10000000000000000000000000000000000000 { result := mul(SCALE, 19) } case 100000000000000000000000000000000000000 { result := mul(SCALE, 20) } case 1000000000000000000000000000000000000000 { result := mul(SCALE, 21) } case 10000000000000000000000000000000000000000 { result := mul(SCALE, 22) } case 100000000000000000000000000000000000000000 { result := mul(SCALE, 23) } case 1000000000000000000000000000000000000000000 { result := mul(SCALE, 24) } case 10000000000000000000000000000000000000000000 { result := mul(SCALE, 25) } case 100000000000000000000000000000000000000000000 { result := mul(SCALE, 26) } case 1000000000000000000000000000000000000000000000 { result := mul(SCALE, 27) } case 10000000000000000000000000000000000000000000000 { result := mul(SCALE, 28) } case 100000000000000000000000000000000000000000000000 { result := mul(SCALE, 29) } case 1000000000000000000000000000000000000000000000000 { result := mul(SCALE, 30) } case 10000000000000000000000000000000000000000000000000 { result := mul(SCALE, 31) } case 100000000000000000000000000000000000000000000000000 { result := mul(SCALE, 32) } case 1000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 33) } case 10000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 34) } case 100000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 35) } case 1000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 36) } case 10000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 37) } case 100000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 38) } case 1000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 39) } case 10000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 40) } case 100000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 41) } case 1000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 42) } case 10000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 43) } case 100000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 44) } case 1000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 45) } case 10000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 46) } case 100000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 47) } case 1000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 48) } case 10000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 49) } case 100000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 50) } case 1000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 51) } case 10000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 52) } case 100000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 53) } case 1000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 54) } case 10000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 55) } case 100000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 56) } case 1000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 57) } case 10000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 58) } default { result := MAX_SD59x18 } } if (result == MAX_SD59x18) { // Do the fixed-point division inline to save gas. The denominator is log2(10). unchecked { result = (log2(x) * SCALE) / 3_321928094887362347; } } } /// @notice Calculates the binary logarithm of x. /// /// @dev Based on the iterative approximation algorithm. /// https://en.wikipedia.org/wiki/Binary_logarithm#Iterative_approximation /// /// Requirements: /// - x must be greater than zero. /// /// Caveats: /// - The results are not perfectly accurate to the last decimal, due to the lossy precision of the iterative approximation. /// /// @param x The signed 59.18-decimal fixed-point number for which to calculate the binary logarithm. /// @return result The binary logarithm as a signed 59.18-decimal fixed-point number. function log2(int256 x) internal pure returns (int256 result) { if (x <= 0) { revert PRBMathSD59x18__LogInputTooSmall(x); } unchecked { // This works because log2(x) = -log2(1/x). int256 sign; if (x >= SCALE) { sign = 1; } else { sign = -1; // Do the fixed-point inversion inline to save gas. The numerator is SCALE * SCALE. assembly { x := div(1000000000000000000000000000000000000, x) } } // Calculate the integer part of the logarithm and add it to the result and finally calculate y = x * 2^(-n). uint256 n = PRBMath.mostSignificantBit(uint256(x / SCALE)); // The integer part of the logarithm as a signed 59.18-decimal fixed-point number. The operation can't overflow // because n is maximum 255, SCALE is 1e18 and sign is either 1 or -1. result = int256(n) * SCALE; // This is y = x * 2^(-n). int256 y = x >> n; // If y = 1, the fractional part is zero. if (y == SCALE) { return result * sign; } // Calculate the fractional part via the iterative approximation. // The "delta >>= 1" part is equivalent to "delta /= 2", but shifting bits is faster. for (int256 delta = int256(HALF_SCALE); delta > 0; delta >>= 1) { y = (y * y) / SCALE; // Is y^2 > 2 and so in the range [2,4)? if (y >= 2 * SCALE) { // Add the 2^(-m) factor to the logarithm. result += delta; // Corresponds to z/2 on Wikipedia. y >>= 1; } } result *= sign; } } /// @notice Multiplies two signed 59.18-decimal fixed-point numbers together, returning a new signed 59.18-decimal /// fixed-point number. /// /// @dev Variant of "mulDiv" that works with signed numbers and employs constant folding, i.e. the denominator is /// always 1e18. /// /// Requirements: /// - All from "PRBMath.mulDivFixedPoint". /// - None of the inputs can be MIN_SD59x18 /// - The result must fit within MAX_SD59x18. /// /// Caveats: /// - The body is purposely left uncommented; see the NatSpec comments in "PRBMath.mulDiv" to understand how this works. /// /// @param x The multiplicand as a signed 59.18-decimal fixed-point number. /// @param y The multiplier as a signed 59.18-decimal fixed-point number. /// @return result The product as a signed 59.18-decimal fixed-point number. function mul(int256 x, int256 y) internal pure returns (int256 result) { if (x == MIN_SD59x18 || y == MIN_SD59x18) { revert PRBMathSD59x18__MulInputTooSmall(); } unchecked { uint256 ax; uint256 ay; ax = x < 0 ? uint256(-x) : uint256(x); ay = y < 0 ? uint256(-y) : uint256(y); uint256 rAbs = PRBMath.mulDivFixedPoint(ax, ay); if (rAbs > uint256(MAX_SD59x18)) { revert PRBMathSD59x18__MulOverflow(rAbs); } uint256 sx; uint256 sy; assembly { sx := sgt(x, sub(0, 1)) sy := sgt(y, sub(0, 1)) } result = sx ^ sy == 1 ? -int256(rAbs) : int256(rAbs); } } /// @notice Returns PI as a signed 59.18-decimal fixed-point number. function pi() internal pure returns (int256 result) { result = 3_141592653589793238; } /// @notice Raises x to the power of y. /// /// @dev Based on the insight that x^y = 2^(log2(x) * y). /// /// Requirements: /// - All from "exp2", "log2" and "mul". /// - z cannot be zero. /// /// Caveats: /// - All from "exp2", "log2" and "mul". /// - Assumes 0^0 is 1. /// /// @param x Number to raise to given power y, as a signed 59.18-decimal fixed-point number. /// @param y Exponent to raise x to, as a signed 59.18-decimal fixed-point number. /// @return result x raised to power y, as a signed 59.18-decimal fixed-point number. function pow(int256 x, int256 y) internal pure returns (int256 result) { if (x == 0) { result = y == 0 ? SCALE : int256(0); } else { result = exp2(mul(log2(x), y)); } } /// @notice Raises x (signed 59.18-decimal fixed-point number) to the power of y (basic unsigned integer) using the /// famous algorithm "exponentiation by squaring". /// /// @dev See https://en.wikipedia.org/wiki/Exponentiation_by_squaring /// /// Requirements: /// - All from "abs" and "PRBMath.mulDivFixedPoint". /// - The result must fit within MAX_SD59x18. /// /// Caveats: /// - All from "PRBMath.mulDivFixedPoint". /// - Assumes 0^0 is 1. /// /// @param x The base as a signed 59.18-decimal fixed-point number. /// @param y The exponent as an uint256. /// @return result The result as a signed 59.18-decimal fixed-point number. function powu(int256 x, uint256 y) internal pure returns (int256 result) { uint256 xAbs = uint256(abs(x)); // Calculate the first iteration of the loop in advance. uint256 rAbs = y & 1 > 0 ? xAbs : uint256(SCALE); // Equivalent to "for(y /= 2; y > 0; y /= 2)" but faster. uint256 yAux = y; for (yAux >>= 1; yAux > 0; yAux >>= 1) { xAbs = PRBMath.mulDivFixedPoint(xAbs, xAbs); // Equivalent to "y % 2 == 1" but faster. if (yAux & 1 > 0) { rAbs = PRBMath.mulDivFixedPoint(rAbs, xAbs); } } // The result must fit within the 59.18-decimal fixed-point representation. if (rAbs > uint256(MAX_SD59x18)) { revert PRBMathSD59x18__PowuOverflow(rAbs); } // Is the base negative and the exponent an odd number? bool isNegative = x < 0 && y & 1 == 1; result = isNegative ? -int256(rAbs) : int256(rAbs); } /// @notice Returns 1 as a signed 59.18-decimal fixed-point number. function scale() internal pure returns (int256 result) { result = SCALE; } /// @notice Calculates the square root of x, rounding down. /// @dev Uses the Babylonian method https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method. /// /// Requirements: /// - x cannot be negative. /// - x must be less than MAX_SD59x18 / SCALE. /// /// @param x The signed 59.18-decimal fixed-point number for which to calculate the square root. /// @return result The result as a signed 59.18-decimal fixed-point . function sqrt(int256 x) internal pure returns (int256 result) { unchecked { if (x < 0) { revert PRBMathSD59x18__SqrtNegativeInput(x); } if (x > MAX_SD59x18 / SCALE) { revert PRBMathSD59x18__SqrtOverflow(x); } // Multiply x by the SCALE to account for the factor of SCALE that is picked up when multiplying two signed // 59.18-decimal fixed-point numbers together (in this case, those two numbers are both the square root). result = int256(PRBMath.sqrt(uint256(x * SCALE))); } } /// @notice Converts a signed 59.18-decimal fixed-point number to basic integer form, rounding down in the process. /// @param x The signed 59.18-decimal fixed-point number to convert. /// @return result The same number in basic integer form. function toInt(int256 x) internal pure returns (int256 result) { unchecked { result = x / SCALE; } } }
//SPDX-License-Identifier: Copyright 2021 Shipyard Software, Inc. pragma solidity ^0.8.0; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"; import "./interfaces/WrapperContractInterface.sol"; import "./ClipperCommonExchange.sol"; contract ClipperDirectExchange is ClipperCommonExchange { using SafeERC20 for IERC20; using EnumerableSet for EnumerableSet.AddressSet; // For prevention of replay attacks mapping(bytes32 => bool) invalidatedDigests; constructor(address theSigner, address theWrapper, address[] memory tokens) ClipperCommonExchange(theSigner, theWrapper, tokens) {} function currentDeltaOverLastBalance(address token) internal view returns (uint256) { return IERC20(token).balanceOf(address(this))-lastBalances[token]; } function _sync(address token) internal override { lastBalances[token] = IERC20(token).balanceOf(address(this)); } function _syncAll() internal { uint i; uint n=assetSet.length(); while(i < n) { _sync(tokenAt(i)); i++; } } // syncAndTransfer() and unwrapAndForwardEth() are the two additional ways tokens leave the pool // Since they transfer assets, they are all marked as nonReentrant function syncAndTransfer(address inputToken, address outputToken, address recipient, uint256 amount) internal nonReentrant { _sync(inputToken); IERC20(outputToken).safeTransfer(recipient, amount); _sync(outputToken); } // Essentially transferAsset, but for raw ETH function unwrapAndForwardEth(address recipient, uint256 amount) internal nonReentrant { /* EFFECTS */ WrapperContractInterface(WRAPPER_CONTRACT).withdraw(amount); _sync(WRAPPER_CONTRACT); /* INTERACTIONS */ safeEthSend(recipient, amount); } /* DEPOSIT FUNCTIONALITY */ function deposit(address sender, uint256[] calldata depositAmounts, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) public payable override { // Wrap if it's there if(msg.value > 0){ safeEthSend(WRAPPER_CONTRACT, msg.value); } require(msg.sender==sender, "Listed sender does not match msg.sender"); // Did we actually deposit what we said we would? Revert otherwise verifyDepositAmounts(depositAmounts); // Check the signature bytes32 depositDigest = createDepositDigest(sender, depositAmounts, nDays, poolTokens, goodUntil); // Revert if it's signed by the wrong address verifyDigestSignature(depositDigest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(depositDigest, goodUntil); // OK now we're good _syncAll(); _mintOrVesting(sender, nDays, poolTokens); emit Deposited(sender, poolTokens, nDays); } function depositSingleAsset(address sender, address inputToken, uint256 inputAmount, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) public payable override { // Wrap if it's there if(msg.value > 0){ safeEthSend(WRAPPER_CONTRACT, msg.value); } require(msg.sender==sender && isToken(inputToken), "Invalid input"); // Did we actually deposit what we said we would? Revert otherwise uint256 delta = currentDeltaOverLastBalance(inputToken); require(delta >= inputAmount, "Insufficient token deposit"); // Check the signature bytes32 depositDigest = createSingleDepositDigest(sender, inputToken, inputAmount, nDays, poolTokens, goodUntil); // Revert if it's signed by the wrong address verifyDigestSignature(depositDigest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(depositDigest, goodUntil); // OK now we're good _sync(inputToken); _mintOrVesting(sender, nDays, poolTokens); emit Deposited(sender, poolTokens, nDays); } function verifyDepositAmounts(uint256[] calldata depositAmounts) internal view { uint i=0; uint n = depositAmounts.length; while(i < n){ uint256 myDeposit = depositAmounts[i]; if(myDeposit > 0){ address token = tokenAt(i); uint256 delta = currentDeltaOverLastBalance(token); require(delta >= myDeposit, "Insufficient token deposit"); } i++; } } /* Single asset withdrawal functionality */ function withdrawSingleAsset(address tokenHolder, uint256 poolTokenAmountToBurn, address assetAddress, uint256 assetAmount, uint256 goodUntil, Signature calldata theSignature) external override { // Make sure the withdrawer is allowed require(msg.sender==tokenHolder, "tokenHolder does not match msg.sender"); bool sendEthBack; if(assetAddress == CLIPPER_ETH_SIGIL) { assetAddress = WRAPPER_CONTRACT; sendEthBack = true; } // Check the signature bytes32 withdrawalDigest = createWithdrawalDigest(tokenHolder, poolTokenAmountToBurn, assetAddress, assetAmount, goodUntil); // Reverts if it's signed by the wrong address verifyDigestSignature(withdrawalDigest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(withdrawalDigest, goodUntil); // Reverts if balance is insufficient _burn(msg.sender, poolTokenAmountToBurn); // Reverts if balance is insufficient // syncs done automatically on transfer if(sendEthBack){ unwrapAndForwardEth(msg.sender, assetAmount); } else { transferAsset(assetAddress, msg.sender, assetAmount); } emit AssetWithdrawn(tokenHolder, poolTokenAmountToBurn, assetAddress, assetAmount); } /* SWAP Functionality */ // Don't need a separate "transmit" function here since it's already payable function sellEthForToken(address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external payable override { // Wrap ETH (as balance or value) as input safeEthSend(WRAPPER_CONTRACT, inputAmount); swap(WRAPPER_CONTRACT, outputToken, inputAmount, outputAmount, goodUntil, destinationAddress, theSignature, auxiliaryData); } // Mostly copied from swap functionality function sellTokenForEth(address inputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external virtual override { (uint256 actualInput, uint256 fairOutput) = verifyTokensAndGetAmounts(inputToken, WRAPPER_CONTRACT, inputAmount, outputAmount); bytes32 digest = createSwapDigest(inputToken, WRAPPER_CONTRACT, inputAmount, outputAmount, goodUntil, destinationAddress); // Revert if it's signed by the wrong address verifyDigestSignature(digest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(digest, goodUntil); // We have to _sync the input token manually here _sync(inputToken); unwrapAndForwardEth(destinationAddress, fairOutput); emit Swapped(inputToken, WRAPPER_CONTRACT, destinationAddress, actualInput, fairOutput, auxiliaryData); } function transmitAndDepositSingleAsset(address inputToken, uint256 inputAmount, uint256 nDays, uint256 poolTokens, uint256 goodUntil, Signature calldata theSignature) external override{ IERC20(inputToken).safeTransferFrom(msg.sender, address(this), inputAmount); depositSingleAsset(msg.sender, inputToken, inputAmount, nDays, poolTokens, goodUntil, theSignature); } function transmitAndSellTokenForEth(address inputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external override { IERC20(inputToken).safeTransferFrom(msg.sender, address(this), inputAmount); this.sellTokenForEth(inputToken, inputAmount, outputAmount, goodUntil, destinationAddress, theSignature, auxiliaryData); } // all-in-one transfer from msg.sender to destinationAddress. function transmitAndSwap(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) external override { IERC20(inputToken).safeTransferFrom(msg.sender, address(this), inputAmount); swap(inputToken, outputToken, inputAmount, outputAmount, goodUntil, destinationAddress, theSignature, auxiliaryData); } function swap(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount, uint256 goodUntil, address destinationAddress, Signature calldata theSignature, bytes calldata auxiliaryData) public virtual override { // Revert if the tokens don't exist (uint256 actualInput, uint256 fairOutput) = verifyTokensAndGetAmounts(inputToken, outputToken, inputAmount, outputAmount); bytes32 digest = createSwapDigest(inputToken, outputToken, inputAmount, outputAmount, goodUntil, destinationAddress); // Revert if it's signed by the wrong address verifyDigestSignature(digest, theSignature); // Revert if it's a replay, or if the timestamp is too late checkTimestampAndInvalidateDigest(digest, goodUntil); // OK, now we are safe to transfer syncAndTransfer(inputToken, outputToken, destinationAddress, fairOutput); emit Swapped(inputToken, outputToken, destinationAddress, actualInput, fairOutput, auxiliaryData); } function verifyTokensAndGetAmounts(address inputToken, address outputToken, uint256 inputAmount, uint256 outputAmount) internal view returns (uint256 actualInput, uint256 fairOutput) { require(isToken(inputToken) && isToken(outputToken), "Tokens not present in pool"); actualInput = currentDeltaOverLastBalance(inputToken); fairOutput = calculateFairOutput(inputAmount, actualInput, outputAmount); } // Used to invalidate swap and deposit digests function checkTimestampAndInvalidateDigest(bytes32 theDigest, uint256 goodUntil) internal { require(!invalidatedDigests[theDigest], "Message digest already present"); require(goodUntil >= block.timestamp, "Message received after allowed timestamp"); invalidatedDigests[theDigest] = true; } }
// SPDX-License-Identifier: Unlicense pragma solidity >=0.8.4; /// @notice Emitted when the result overflows uint256. error PRBMath__MulDivFixedPointOverflow(uint256 prod1); /// @notice Emitted when the result overflows uint256. error PRBMath__MulDivOverflow(uint256 prod1, uint256 denominator); /// @notice Emitted when one of the inputs is type(int256).min. error PRBMath__MulDivSignedInputTooSmall(); /// @notice Emitted when the intermediary absolute result overflows int256. error PRBMath__MulDivSignedOverflow(uint256 rAbs); /// @notice Emitted when the input is MIN_SD59x18. error PRBMathSD59x18__AbsInputTooSmall(); /// @notice Emitted when ceiling a number overflows SD59x18. error PRBMathSD59x18__CeilOverflow(int256 x); /// @notice Emitted when one of the inputs is MIN_SD59x18. error PRBMathSD59x18__DivInputTooSmall(); /// @notice Emitted when one of the intermediary unsigned results overflows SD59x18. error PRBMathSD59x18__DivOverflow(uint256 rAbs); /// @notice Emitted when the input is greater than 133.084258667509499441. error PRBMathSD59x18__ExpInputTooBig(int256 x); /// @notice Emitted when the input is greater than 192. error PRBMathSD59x18__Exp2InputTooBig(int256 x); /// @notice Emitted when flooring a number underflows SD59x18. error PRBMathSD59x18__FloorUnderflow(int256 x); /// @notice Emitted when converting a basic integer to the fixed-point format overflows SD59x18. error PRBMathSD59x18__FromIntOverflow(int256 x); /// @notice Emitted when converting a basic integer to the fixed-point format underflows SD59x18. error PRBMathSD59x18__FromIntUnderflow(int256 x); /// @notice Emitted when the product of the inputs is negative. error PRBMathSD59x18__GmNegativeProduct(int256 x, int256 y); /// @notice Emitted when multiplying the inputs overflows SD59x18. error PRBMathSD59x18__GmOverflow(int256 x, int256 y); /// @notice Emitted when the input is less than or equal to zero. error PRBMathSD59x18__LogInputTooSmall(int256 x); /// @notice Emitted when one of the inputs is MIN_SD59x18. error PRBMathSD59x18__MulInputTooSmall(); /// @notice Emitted when the intermediary absolute result overflows SD59x18. error PRBMathSD59x18__MulOverflow(uint256 rAbs); /// @notice Emitted when the intermediary absolute result overflows SD59x18. error PRBMathSD59x18__PowuOverflow(uint256 rAbs); /// @notice Emitted when the input is negative. error PRBMathSD59x18__SqrtNegativeInput(int256 x); /// @notice Emitted when the calculating the square root overflows SD59x18. error PRBMathSD59x18__SqrtOverflow(int256 x); /// @notice Emitted when addition overflows UD60x18. error PRBMathUD60x18__AddOverflow(uint256 x, uint256 y); /// @notice Emitted when ceiling a number overflows UD60x18. error PRBMathUD60x18__CeilOverflow(uint256 x); /// @notice Emitted when the input is greater than 133.084258667509499441. error PRBMathUD60x18__ExpInputTooBig(uint256 x); /// @notice Emitted when the input is greater than 192. error PRBMathUD60x18__Exp2InputTooBig(uint256 x); /// @notice Emitted when converting a basic integer to the fixed-point format format overflows UD60x18. error PRBMathUD60x18__FromUintOverflow(uint256 x); /// @notice Emitted when multiplying the inputs overflows UD60x18. error PRBMathUD60x18__GmOverflow(uint256 x, uint256 y); /// @notice Emitted when the input is less than 1. error PRBMathUD60x18__LogInputTooSmall(uint256 x); /// @notice Emitted when the calculating the square root overflows UD60x18. error PRBMathUD60x18__SqrtOverflow(uint256 x); /// @notice Emitted when subtraction underflows UD60x18. error PRBMathUD60x18__SubUnderflow(uint256 x, uint256 y); /// @dev Common mathematical functions used in both PRBMathSD59x18 and PRBMathUD60x18. Note that this shared library /// does not always assume the signed 59.18-decimal fixed-point or the unsigned 60.18-decimal fixed-point /// representation. When it does not, it is explicitly mentioned in the NatSpec documentation. library PRBMath { /// STRUCTS /// struct SD59x18 { int256 value; } struct UD60x18 { uint256 value; } /// STORAGE /// /// @dev How many trailing decimals can be represented. uint256 internal constant SCALE = 1e18; /// @dev Largest power of two divisor of SCALE. uint256 internal constant SCALE_LPOTD = 262144; /// @dev SCALE inverted mod 2^256. uint256 internal constant SCALE_INVERSE = 78156646155174841979727994598816262306175212592076161876661_508869554232690281; /// FUNCTIONS /// /// @notice Calculates the binary exponent of x using the binary fraction method. /// @dev Has to use 192.64-bit fixed-point numbers. /// See https://ethereum.stackexchange.com/a/96594/24693. /// @param x The exponent as an unsigned 192.64-bit fixed-point number. /// @return result The result as an unsigned 60.18-decimal fixed-point number. function exp2(uint256 x) internal pure returns (uint256 result) { unchecked { // Start from 0.5 in the 192.64-bit fixed-point format. result = 0x800000000000000000000000000000000000000000000000; // Multiply the result by root(2, 2^-i) when the bit at position i is 1. None of the intermediary results overflows // because the initial result is 2^191 and all magic factors are less than 2^65. if (x & 0x8000000000000000 > 0) { result = (result * 0x16A09E667F3BCC909) >> 64; } if (x & 0x4000000000000000 > 0) { result = (result * 0x1306FE0A31B7152DF) >> 64; } if (x & 0x2000000000000000 > 0) { result = (result * 0x1172B83C7D517ADCE) >> 64; } if (x & 0x1000000000000000 > 0) { result = (result * 0x10B5586CF9890F62A) >> 64; } if (x & 0x800000000000000 > 0) { result = (result * 0x1059B0D31585743AE) >> 64; } if (x & 0x400000000000000 > 0) { result = (result * 0x102C9A3E778060EE7) >> 64; } if (x & 0x200000000000000 > 0) { result = (result * 0x10163DA9FB33356D8) >> 64; } if (x & 0x100000000000000 > 0) { result = (result * 0x100B1AFA5ABCBED61) >> 64; } if (x & 0x80000000000000 > 0) { result = (result * 0x10058C86DA1C09EA2) >> 64; } if (x & 0x40000000000000 > 0) { result = (result * 0x1002C605E2E8CEC50) >> 64; } if (x & 0x20000000000000 > 0) { result = (result * 0x100162F3904051FA1) >> 64; } if (x & 0x10000000000000 > 0) { result = (result * 0x1000B175EFFDC76BA) >> 64; } if (x & 0x8000000000000 > 0) { result = (result * 0x100058BA01FB9F96D) >> 64; } if (x & 0x4000000000000 > 0) { result = (result * 0x10002C5CC37DA9492) >> 64; } if (x & 0x2000000000000 > 0) { result = (result * 0x1000162E525EE0547) >> 64; } if (x & 0x1000000000000 > 0) { result = (result * 0x10000B17255775C04) >> 64; } if (x & 0x800000000000 > 0) { result = (result * 0x1000058B91B5BC9AE) >> 64; } if (x & 0x400000000000 > 0) { result = (result * 0x100002C5C89D5EC6D) >> 64; } if (x & 0x200000000000 > 0) { result = (result * 0x10000162E43F4F831) >> 64; } if (x & 0x100000000000 > 0) { result = (result * 0x100000B1721BCFC9A) >> 64; } if (x & 0x80000000000 > 0) { result = (result * 0x10000058B90CF1E6E) >> 64; } if (x & 0x40000000000 > 0) { result = (result * 0x1000002C5C863B73F) >> 64; } if (x & 0x20000000000 > 0) { result = (result * 0x100000162E430E5A2) >> 64; } if (x & 0x10000000000 > 0) { result = (result * 0x1000000B172183551) >> 64; } if (x & 0x8000000000 > 0) { result = (result * 0x100000058B90C0B49) >> 64; } if (x & 0x4000000000 > 0) { result = (result * 0x10000002C5C8601CC) >> 64; } if (x & 0x2000000000 > 0) { result = (result * 0x1000000162E42FFF0) >> 64; } if (x & 0x1000000000 > 0) { result = (result * 0x10000000B17217FBB) >> 64; } if (x & 0x800000000 > 0) { result = (result * 0x1000000058B90BFCE) >> 64; } if (x & 0x400000000 > 0) { result = (result * 0x100000002C5C85FE3) >> 64; } if (x & 0x200000000 > 0) { result = (result * 0x10000000162E42FF1) >> 64; } if (x & 0x100000000 > 0) { result = (result * 0x100000000B17217F8) >> 64; } if (x & 0x80000000 > 0) { result = (result * 0x10000000058B90BFC) >> 64; } if (x & 0x40000000 > 0) { result = (result * 0x1000000002C5C85FE) >> 64; } if (x & 0x20000000 > 0) { result = (result * 0x100000000162E42FF) >> 64; } if (x & 0x10000000 > 0) { result = (result * 0x1000000000B17217F) >> 64; } if (x & 0x8000000 > 0) { result = (result * 0x100000000058B90C0) >> 64; } if (x & 0x4000000 > 0) { result = (result * 0x10000000002C5C860) >> 64; } if (x & 0x2000000 > 0) { result = (result * 0x1000000000162E430) >> 64; } if (x & 0x1000000 > 0) { result = (result * 0x10000000000B17218) >> 64; } if (x & 0x800000 > 0) { result = (result * 0x1000000000058B90C) >> 64; } if (x & 0x400000 > 0) { result = (result * 0x100000000002C5C86) >> 64; } if (x & 0x200000 > 0) { result = (result * 0x10000000000162E43) >> 64; } if (x & 0x100000 > 0) { result = (result * 0x100000000000B1721) >> 64; } if (x & 0x80000 > 0) { result = (result * 0x10000000000058B91) >> 64; } if (x & 0x40000 > 0) { result = (result * 0x1000000000002C5C8) >> 64; } if (x & 0x20000 > 0) { result = (result * 0x100000000000162E4) >> 64; } if (x & 0x10000 > 0) { result = (result * 0x1000000000000B172) >> 64; } if (x & 0x8000 > 0) { result = (result * 0x100000000000058B9) >> 64; } if (x & 0x4000 > 0) { result = (result * 0x10000000000002C5D) >> 64; } if (x & 0x2000 > 0) { result = (result * 0x1000000000000162E) >> 64; } if (x & 0x1000 > 0) { result = (result * 0x10000000000000B17) >> 64; } if (x & 0x800 > 0) { result = (result * 0x1000000000000058C) >> 64; } if (x & 0x400 > 0) { result = (result * 0x100000000000002C6) >> 64; } if (x & 0x200 > 0) { result = (result * 0x10000000000000163) >> 64; } if (x & 0x100 > 0) { result = (result * 0x100000000000000B1) >> 64; } if (x & 0x80 > 0) { result = (result * 0x10000000000000059) >> 64; } if (x & 0x40 > 0) { result = (result * 0x1000000000000002C) >> 64; } if (x & 0x20 > 0) { result = (result * 0x10000000000000016) >> 64; } if (x & 0x10 > 0) { result = (result * 0x1000000000000000B) >> 64; } if (x & 0x8 > 0) { result = (result * 0x10000000000000006) >> 64; } if (x & 0x4 > 0) { result = (result * 0x10000000000000003) >> 64; } if (x & 0x2 > 0) { result = (result * 0x10000000000000001) >> 64; } if (x & 0x1 > 0) { result = (result * 0x10000000000000001) >> 64; } // We're doing two things at the same time: // // 1. Multiply the result by 2^n + 1, where "2^n" is the integer part and the one is added to account for // the fact that we initially set the result to 0.5. This is accomplished by subtracting from 191 // rather than 192. // 2. Convert the result to the unsigned 60.18-decimal fixed-point format. // // This works because 2^(191-ip) = 2^ip / 2^191, where "ip" is the integer part "2^n". result *= SCALE; result >>= (191 - (x >> 64)); } } /// @notice Finds the zero-based index of the first one in the binary representation of x. /// @dev See the note on msb in the "Find First Set" Wikipedia article https://en.wikipedia.org/wiki/Find_first_set /// @param x The uint256 number for which to find the index of the most significant bit. /// @return msb The index of the most significant bit as an uint256. function mostSignificantBit(uint256 x) internal pure returns (uint256 msb) { if (x >= 2**128) { x >>= 128; msb += 128; } if (x >= 2**64) { x >>= 64; msb += 64; } if (x >= 2**32) { x >>= 32; msb += 32; } if (x >= 2**16) { x >>= 16; msb += 16; } if (x >= 2**8) { x >>= 8; msb += 8; } if (x >= 2**4) { x >>= 4; msb += 4; } if (x >= 2**2) { x >>= 2; msb += 2; } if (x >= 2**1) { // No need to shift x any more. msb += 1; } } /// @notice Calculates floor(x*y÷denominator) with full precision. /// /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv. /// /// Requirements: /// - The denominator cannot be zero. /// - The result must fit within uint256. /// /// Caveats: /// - This function does not work with fixed-point numbers. /// /// @param x The multiplicand as an uint256. /// @param y The multiplier as an uint256. /// @param denominator The divisor as an uint256. /// @return result The result as an uint256. function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { unchecked { result = prod0 / denominator; } return result; } // Make sure the result is less than 2^256. Also prevents denominator == 0. if (prod1 >= denominator) { revert PRBMath__MulDivOverflow(prod1, denominator); } /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. unchecked { // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 lpotdod = denominator & (~denominator + 1); assembly { // Divide denominator by lpotdod. denominator := div(denominator, lpotdod) // Divide [prod1 prod0] by lpotdod. prod0 := div(prod0, lpotdod) // Flip lpotdod such that it is 2^256 / lpotdod. If lpotdod is zero, then it becomes one. lpotdod := add(div(sub(0, lpotdod), lpotdod), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * lpotdod; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /// @notice Calculates floor(x*y÷1e18) with full precision. /// /// @dev Variant of "mulDiv" with constant folding, i.e. in which the denominator is always 1e18. Before returning the /// final result, we add 1 if (x * y) % SCALE >= HALF_SCALE. Without this, 6.6e-19 would be truncated to 0 instead of /// being rounded to 1e-18. See "Listing 6" and text above it at https://accu.org/index.php/journals/1717. /// /// Requirements: /// - The result must fit within uint256. /// /// Caveats: /// - The body is purposely left uncommented; see the NatSpec comments in "PRBMath.mulDiv" to understand how this works. /// - It is assumed that the result can never be type(uint256).max when x and y solve the following two equations: /// 1. x * y = type(uint256).max * SCALE /// 2. (x * y) % SCALE >= SCALE / 2 /// /// @param x The multiplicand as an unsigned 60.18-decimal fixed-point number. /// @param y The multiplier as an unsigned 60.18-decimal fixed-point number. /// @return result The result as an unsigned 60.18-decimal fixed-point number. function mulDivFixedPoint(uint256 x, uint256 y) internal pure returns (uint256 result) { uint256 prod0; uint256 prod1; assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } if (prod1 >= SCALE) { revert PRBMath__MulDivFixedPointOverflow(prod1); } uint256 remainder; uint256 roundUpUnit; assembly { remainder := mulmod(x, y, SCALE) roundUpUnit := gt(remainder, 499999999999999999) } if (prod1 == 0) { unchecked { result = (prod0 / SCALE) + roundUpUnit; return result; } } assembly { result := add( mul( or( div(sub(prod0, remainder), SCALE_LPOTD), mul(sub(prod1, gt(remainder, prod0)), add(div(sub(0, SCALE_LPOTD), SCALE_LPOTD), 1)) ), SCALE_INVERSE ), roundUpUnit ) } } /// @notice Calculates floor(x*y÷denominator) with full precision. /// /// @dev An extension of "mulDiv" for signed numbers. Works by computing the signs and the absolute values separately. /// /// Requirements: /// - None of the inputs can be type(int256).min. /// - The result must fit within int256. /// /// @param x The multiplicand as an int256. /// @param y The multiplier as an int256. /// @param denominator The divisor as an int256. /// @return result The result as an int256. function mulDivSigned( int256 x, int256 y, int256 denominator ) internal pure returns (int256 result) { if (x == type(int256).min || y == type(int256).min || denominator == type(int256).min) { revert PRBMath__MulDivSignedInputTooSmall(); } // Get hold of the absolute values of x, y and the denominator. uint256 ax; uint256 ay; uint256 ad; unchecked { ax = x < 0 ? uint256(-x) : uint256(x); ay = y < 0 ? uint256(-y) : uint256(y); ad = denominator < 0 ? uint256(-denominator) : uint256(denominator); } // Compute the absolute value of (x*y)÷denominator. The result must fit within int256. uint256 rAbs = mulDiv(ax, ay, ad); if (rAbs > uint256(type(int256).max)) { revert PRBMath__MulDivSignedOverflow(rAbs); } // Get the signs of x, y and the denominator. uint256 sx; uint256 sy; uint256 sd; assembly { sx := sgt(x, sub(0, 1)) sy := sgt(y, sub(0, 1)) sd := sgt(denominator, sub(0, 1)) } // XOR over sx, sy and sd. This is checking whether there are one or three negative signs in the inputs. // If yes, the result should be negative. result = sx ^ sy ^ sd == 0 ? -int256(rAbs) : int256(rAbs); } /// @notice Calculates the square root of x, rounding down. /// @dev Uses the Babylonian method https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method. /// /// Caveats: /// - This function does not work with fixed-point numbers. /// /// @param x The uint256 number for which to calculate the square root. /// @return result The result as an uint256. function sqrt(uint256 x) internal pure returns (uint256 result) { if (x == 0) { return 0; } // Set the initial guess to the least power of two that is greater than or equal to sqrt(x). uint256 xAux = uint256(x); result = 1; if (xAux >= 0x100000000000000000000000000000000) { xAux >>= 128; result <<= 64; } if (xAux >= 0x10000000000000000) { xAux >>= 64; result <<= 32; } if (xAux >= 0x100000000) { xAux >>= 32; result <<= 16; } if (xAux >= 0x10000) { xAux >>= 16; result <<= 8; } if (xAux >= 0x100) { xAux >>= 8; result <<= 4; } if (xAux >= 0x10) { xAux >>= 4; result <<= 2; } if (xAux >= 0x8) { result <<= 1; } // The operations can never overflow because the result is max 2^127 when it enters this block. unchecked { result = (result + x / result) >> 1; result = (result + x / result) >> 1; result = (result + x / result) >> 1; result = (result + x / result) >> 1; result = (result + x / result) >> 1; result = (result + x / result) >> 1; result = (result + x / result) >> 1; // Seven iterations should be enough uint256 roundedDownResult = x / result; return result >= roundedDownResult ? roundedDownResult : result; } } }
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Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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ClipperCommonExchange.Signature","name":"theSignature","type":"tuple"}],"name":"withdrawSingleAsset","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : theSigner (address): 0x08938a61BA9523298dbCAceE0cda5B371FB7f1F8
Arg [1] : theWrapper (address): 0x4200000000000000000000000000000000000006
Arg [2] : tokens (address[]): 0x4200000000000000000000000000000000000006,0x7F5c764cBc14f9669B88837ca1490cCa17c31607,0x94b008aA00579c1307B0EF2c499aD98a8ce58e58,0x68f180fcCe6836688e9084f035309E29Bf0A2095,0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1,0x350a791Bfc2C21F9Ed5d10980Dad2e2638ffa7f6,0x4200000000000000000000000000000000000042
-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 00000000000000000000000008938a61ba9523298dbcacee0cda5b371fb7f1f8
Arg [1] : 0000000000000000000000004200000000000000000000000000000000000006
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [4] : 0000000000000000000000004200000000000000000000000000000000000006
Arg [5] : 0000000000000000000000007f5c764cbc14f9669b88837ca1490cca17c31607
Arg [6] : 00000000000000000000000094b008aa00579c1307b0ef2c499ad98a8ce58e58
Arg [7] : 00000000000000000000000068f180fcce6836688e9084f035309e29bf0a2095
Arg [8] : 000000000000000000000000da10009cbd5d07dd0cecc66161fc93d7c9000da1
Arg [9] : 000000000000000000000000350a791bfc2c21f9ed5d10980dad2e2638ffa7f6
Arg [10] : 0000000000000000000000004200000000000000000000000000000000000042
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OVERVIEW
This is the new Clipper Exchange contract on Optimism.Loading...
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
OP | 50.42% | $102,862 | 0.1115 | $11,465.35 | |
OP | 21.77% | $3,902.09 | 1.2688 | $4,951.02 | |
OP | 10.95% | $1 | 2,489.4448 | $2,489.44 | |
OP | 6.18% | $1 | 1,406.4159 | $1,406.42 | |
OP | 4.44% | $2.52 | 399.9279 | $1,009.49 | |
OP | 3.97% | $1 | 902.2768 | $902.28 | |
OP | Ether (ETH) | <0.01% | $3,909.57 | 0.0000000000604599 | <$0.000001 |
ARB | 2.07% | $3,910.5 | 0.1202 | $469.88 | |
POL | 0.21% | $0.611401 | 76.5943 | $46.83 | |
GLMR | <0.01% | $0.313202 | 0.2 | $0.06264 |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.