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Latest 10 from a total of 10 transactions
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Claim LOAN | 20060135 | 97 days ago | IN | 0 ETH | 0.00053079 | ||||
Repay LOAN | 20060121 | 97 days ago | IN | 0 ETH | 0.00077587 | ||||
Claim LOAN | 20060112 | 97 days ago | IN | 0 ETH | 0.00059524 | ||||
Repay LOAN | 20058297 | 97 days ago | IN | 0 ETH | 0.00054988 | ||||
Claim LOAN | 17880453 | 402 days ago | IN | 0 ETH | 0.00127881 | ||||
Repay LOAN | 17842616 | 408 days ago | IN | 0 ETH | 0.00241747 | ||||
Create LOAN | 17819812 | 411 days ago | IN | 0 ETH | 0.00612136 | ||||
Create LOAN | 17819029 | 411 days ago | IN | 0 ETH | 0.00620166 | ||||
Create LOAN | 17620529 | 439 days ago | IN | 0 ETH | 0.00669894 | ||||
Create LOAN | 17620200 | 439 days ago | IN | 0 ETH | 0.01041268 |
Latest 1 internal transaction
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17289963 | 485 days ago | Contract Creation | 0 ETH |
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Contract Name:
PWNSimpleLoan
Compiler Version
v0.8.16+commit.07a7930e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "MultiToken/MultiToken.sol"; import "@pwn/config/PWNConfig.sol"; import "@pwn/hub/PWNHub.sol"; import "@pwn/hub/PWNHubTags.sol"; import "@pwn/loan/lib/PWNFeeCalculator.sol"; import "@pwn/loan/terms/PWNLOANTerms.sol"; import "@pwn/loan/terms/simple/factory/PWNSimpleLoanTermsFactory.sol"; import "@pwn/loan/token/IERC5646.sol"; import "@pwn/loan/token/PWNLOAN.sol"; import "@pwn/loan/PWNVault.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN Simple Loan * @notice Contract managing a simple loan in PWN protocol. * @dev Acts as a vault for every loan created by this contract. */ contract PWNSimpleLoan is PWNVault, IERC5646, IPWNLoanMetadataProvider { string internal constant VERSION = "1.0"; uint256 public constant MAX_EXPIRATION_EXTENSION = 2_592_000; // 30 days /*----------------------------------------------------------*| |* # VARIABLES & CONSTANTS DEFINITIONS *| |*----------------------------------------------------------*/ PWNHub immutable internal hub; PWNLOAN immutable internal loanToken; PWNConfig immutable internal config; /** * @notice Struct defining a simple loan. * @param status 0 == none/dead || 2 == running/accepted offer/accepted request || 3 == paid back || 4 == expired. * @param borrower Address of a borrower. * @param expiration Unix timestamp (in seconds) setting up a default date. * @param loanAssetAddress Address of an asset used as a loan credit. * @param loanRepayAmount Amount of a loan asset to be paid back. * @param collateral Asset used as a loan collateral. For a definition see { MultiToken dependency lib }. */ struct LOAN { uint8 status; address borrower; uint40 expiration; address loanAssetAddress; uint256 loanRepayAmount; MultiToken.Asset collateral; } /** * Mapping of all LOAN data by loan id. */ mapping (uint256 => LOAN) private LOANs; /*----------------------------------------------------------*| |* # EVENTS & ERRORS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Emitted when a new loan in created. */ event LOANCreated(uint256 indexed loanId, PWNLOANTerms.Simple terms); /** * @dev Emitted when a loan is paid back. */ event LOANPaidBack(uint256 indexed loanId); /** * @dev Emitted when a repaid or defaulted loan is claimed. */ event LOANClaimed(uint256 indexed loanId, bool indexed defaulted); /** * @dev Emitted when a LOAN token holder extends loan expiration date. */ event LOANExpirationDateExtended(uint256 indexed loanId, uint40 extendedExpirationDate); /*----------------------------------------------------------*| |* # CONSTRUCTOR *| |*----------------------------------------------------------*/ constructor(address _hub, address _loanToken, address _config) { hub = PWNHub(_hub); loanToken = PWNLOAN(_loanToken); config = PWNConfig(_config); } /*----------------------------------------------------------*| |* # CREATE LOAN *| |*----------------------------------------------------------*/ /** * @notice Create a new loan by minting LOAN token for lender, transferring loan asset to a borrower and a collateral to a vault. * @dev The function assumes a prior token approval to a contract address or signed permits. * @param loanTermsFactoryContract Address of a loan terms factory contract. Need to have `SIMPLE_LOAN_TERMS_FACTORY` tag in PWN Hub. * @param loanTermsFactoryData Encoded data for a loan terms factory. * @param signature Signed loan factory data. Could be empty if an offer / request has been made via on-chain transaction. * @param loanAssetPermit Permit data for a loan asset signed by a lender. * @param collateralPermit Permit data for a collateral signed by a borrower. * @return loanId Id of a newly minted LOAN token. */ function createLOAN( address loanTermsFactoryContract, bytes calldata loanTermsFactoryData, bytes calldata signature, bytes calldata loanAssetPermit, bytes calldata collateralPermit ) external returns (uint256 loanId) { // Check that loan terms factory contract is tagged in PWNHub if (hub.hasTag(loanTermsFactoryContract, PWNHubTags.SIMPLE_LOAN_TERMS_FACTORY) == false) revert CallerMissingHubTag(PWNHubTags.SIMPLE_LOAN_TERMS_FACTORY); // Build PWNLOANTerms.Simple by loan factory PWNLOANTerms.Simple memory loanTerms = PWNSimpleLoanTermsFactory(loanTermsFactoryContract).createLOANTerms({ caller: msg.sender, factoryData: loanTermsFactoryData, signature: signature }); // Check loan asset validity if (MultiToken.isValid(loanTerms.asset) == false) revert InvalidLoanAsset(); // Check collateral validity if (MultiToken.isValid(loanTerms.collateral) == false) revert InvalidCollateralAsset(); // Mint LOAN token for lender loanId = loanToken.mint(loanTerms.lender); // Store loan data under loan id LOAN storage loan = LOANs[loanId]; loan.status = 2; loan.borrower = loanTerms.borrower; loan.expiration = loanTerms.expiration; loan.loanAssetAddress = loanTerms.asset.assetAddress; loan.loanRepayAmount = loanTerms.loanRepayAmount; loan.collateral = loanTerms.collateral; emit LOANCreated(loanId, loanTerms); // Transfer collateral to Vault _permit(loanTerms.collateral, loanTerms.borrower, collateralPermit); _pull(loanTerms.collateral, loanTerms.borrower); // Permit spending if permit data provided _permit(loanTerms.asset, loanTerms.lender, loanAssetPermit); uint16 fee = config.fee(); if (fee > 0) { // Compute fee size (uint256 feeAmount, uint256 newLoanAmount) = PWNFeeCalculator.calculateFeeAmount(fee, loanTerms.asset.amount); if (feeAmount > 0) { // Transfer fee amount to fee collector loanTerms.asset.amount = feeAmount; _pushFrom(loanTerms.asset, loanTerms.lender, config.feeCollector()); // Set new loan amount value loanTerms.asset.amount = newLoanAmount; } } // Transfer loan asset to borrower _pushFrom(loanTerms.asset, loanTerms.lender, loanTerms.borrower); } /*----------------------------------------------------------*| |* # REPAY LOAN *| |*----------------------------------------------------------*/ /** * @notice Repay running loan. * @dev Any address can repay a running loan, but a collateral will be transferred to a borrower address associated with the loan. * Repay will transfer a loan asset to a vault, waiting on a LOAN token holder to claim it. * The function assumes a prior token approval to a contract address or a signed permit. * @param loanId Id of a loan that is being repaid. * @param loanAssetPermit Permit data for a loan asset signed by a borrower. */ function repayLOAN( uint256 loanId, bytes calldata loanAssetPermit ) external { LOAN storage loan = LOANs[loanId]; uint8 status = loan.status; // Check that loan is not from a different loan contract if (status == 0) revert NonExistingLoan(); // Check that loan is running else if (status != 2) revert InvalidLoanStatus(status); // Check that loan is not expired if (loan.expiration <= block.timestamp) revert LoanDefaulted(loan.expiration); // Move loan to repaid state loan.status = 3; // Transfer repaid amount of loan asset to Vault MultiToken.Asset memory repayLoanAsset = MultiToken.Asset({ category: MultiToken.Category.ERC20, assetAddress: loan.loanAssetAddress, id: 0, amount: loan.loanRepayAmount }); _permit(repayLoanAsset, msg.sender, loanAssetPermit); _pull(repayLoanAsset, msg.sender); // Transfer collateral back to borrower _push(loan.collateral, loan.borrower); emit LOANPaidBack(loanId); } /*----------------------------------------------------------*| |* # CLAIM LOAN *| |*----------------------------------------------------------*/ /** * @notice Claim a repaid or defaulted loan. * @dev Only a LOAN token holder can claim a repaid or defaulted loan. * Claim will transfer the repaid loan asset or collateral to a LOAN token holder address and burn the LOAN token. * @param loanId Id of a loan that is being claimed. */ function claimLOAN(uint256 loanId) external { LOAN storage loan = LOANs[loanId]; // Check that caller is LOAN token holder if (loanToken.ownerOf(loanId) != msg.sender) revert CallerNotLOANTokenHolder(); if (loan.status == 0) { revert NonExistingLoan(); } // Loan has been paid back else if (loan.status == 3) { MultiToken.Asset memory loanAsset = MultiToken.Asset({ category: MultiToken.Category.ERC20, assetAddress: loan.loanAssetAddress, id: 0, amount: loan.loanRepayAmount }); // Delete loan data & burn LOAN token before calling safe transfer _deleteLoan(loanId); // Transfer repaid loan to lender _push(loanAsset, msg.sender); emit LOANClaimed(loanId, false); } // Loan is running but expired else if (loan.status == 2 && loan.expiration <= block.timestamp) { MultiToken.Asset memory collateral = loan.collateral; // Delete loan data & burn LOAN token before calling safe transfer _deleteLoan(loanId); // Transfer collateral to lender _push(collateral, msg.sender); emit LOANClaimed(loanId, true); } // Loan is in wrong state or from a different loan contract else { revert InvalidLoanStatus(loan.status); } } function _deleteLoan(uint256 loanId) private { loanToken.burn(loanId); delete LOANs[loanId]; } /*----------------------------------------------------------*| |* # EXTEND LOAN EXPIRATION DATE *| |*----------------------------------------------------------*/ /** * @notice Enable lender to extend loans expiration date. * @dev Only LOAN token holder can call this function. * Extending the expiration date of a repaid loan is allowed, but considered a lender mistake. * The extended expiration date has to be in the future, be later than the current expiration date, and cannot be extending the date by more than `MAX_EXPIRATION_EXTENSION`. * @param loanId Id of a LOAN to extend its expiration date. * @param extendedExpirationDate New LOAN expiration date. */ function extendLOANExpirationDate(uint256 loanId, uint40 extendedExpirationDate) external { // Check that caller is LOAN token holder // This prevents from extending non-existing loans if (loanToken.ownerOf(loanId) != msg.sender) revert CallerNotLOANTokenHolder(); LOAN storage loan = LOANs[loanId]; // Check extended expiration date if (extendedExpirationDate > uint40(block.timestamp + MAX_EXPIRATION_EXTENSION)) // to protect lender revert InvalidExtendedExpirationDate(); if (extendedExpirationDate <= uint40(block.timestamp)) // have to extend expiration futher in time revert InvalidExtendedExpirationDate(); if (extendedExpirationDate <= loan.expiration) // have to be later than current expiration date revert InvalidExtendedExpirationDate(); // Extend expiration date loan.expiration = extendedExpirationDate; emit LOANExpirationDateExtended(loanId, extendedExpirationDate); } /*----------------------------------------------------------*| |* # GET LOAN *| |*----------------------------------------------------------*/ /** * @notice Return a LOAN data struct associated with a loan id. * @param loanId Id of a loan in question. * @return loan LOAN data struct or empty struct if the LOAN doesn't exist. */ function getLOAN(uint256 loanId) external view returns (LOAN memory loan) { loan = LOANs[loanId]; loan.status = _getLOANStatus(loanId); } function _getLOANStatus(uint256 loanId) private view returns (uint8) { LOAN storage loan = LOANs[loanId]; return (loan.status == 2 && loan.expiration <= block.timestamp) ? 4 : loan.status; } /*----------------------------------------------------------*| |* # IPWNLoanMetadataProvider *| |*----------------------------------------------------------*/ /** * @notice See { IPWNLoanMetadataProvider.sol }. */ function loanMetadataUri() override external view returns (string memory) { return config.loanMetadataUri(address(this)); } /*----------------------------------------------------------*| |* # ERC5646 *| |*----------------------------------------------------------*/ /** * @dev See {IERC5646-getStateFingerprint}. */ function getStateFingerprint(uint256 tokenId) external view virtual override returns (bytes32) { LOAN storage loan = LOANs[tokenId]; if (loan.status == 0) return bytes32(0); // The only mutable state properties are: // - status, expiration // Status is updated for expired loans based on block.timestamp. // Others don't have to be part of the state fingerprint as it does not act as a token identification. return keccak256(abi.encode( _getLOANStatus(tokenId), loan.expiration )); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/interfaces/IERC20.sol"; import "@openzeppelin/interfaces/IERC721.sol"; import "@openzeppelin/interfaces/IERC1155.sol"; import "@openzeppelin/token/ERC20/extensions/draft-IERC20Permit.sol"; import "@openzeppelin/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/utils/introspection/ERC165Checker.sol"; import "@MT/interfaces/ICryptoKitties.sol"; library MultiToken { using ERC165Checker for address; using SafeERC20 for IERC20; bytes4 public constant ERC20_INTERFACE_ID = 0x36372b07; bytes4 public constant ERC721_INTERFACE_ID = 0x80ac58cd; bytes4 public constant ERC1155_INTERFACE_ID = 0xd9b67a26; bytes4 public constant CRYPTO_KITTIES_INTERFACE_ID = 0x9a20483d; /** * @title Category * @dev Enum representation Asset category. */ enum Category { ERC20, ERC721, ERC1155, CryptoKitties } /** * @title Asset * @param category Corresponding asset category. * @param assetAddress Address of the token contract defining the asset. * @param id TokenID of an NFT or 0. * @param amount Amount of fungible tokens or 0 -> 1. */ struct Asset { Category category; address assetAddress; uint256 id; uint256 amount; } /*----------------------------------------------------------*| |* # TRANSFER ASSET *| |*----------------------------------------------------------*/ /** * transferAssetFrom * @dev Wrapping function for `transferFrom` calls on various token interfaces. * If `source` is `address(this)`, function `transfer` is called instead of `transferFrom` for ERC20 category. * @param asset Struct defining all necessary context of a token. * @param source Account/address that provided the allowance. * @param dest Destination address. */ function transferAssetFrom(Asset memory asset, address source, address dest) internal { _transferAssetFrom(asset, source, dest, false); } /** * safeTransferAssetFrom * @dev Wrapping function for `safeTransferFrom` calls on various token interfaces. * If `source` is `address(this)`, function `transfer` is called instead of `transferFrom` for ERC20 category. * @param asset Struct defining all necessary context of a token. * @param source Account/address that provided the allowance. * @param dest Destination address. */ function safeTransferAssetFrom(Asset memory asset, address source, address dest) internal { _transferAssetFrom(asset, source, dest, true); } function _transferAssetFrom(Asset memory asset, address source, address dest, bool isSafe) private { if (asset.category == Category.ERC20) { if (source == address(this)) IERC20(asset.assetAddress).safeTransfer(dest, asset.amount); else IERC20(asset.assetAddress).safeTransferFrom(source, dest, asset.amount); } else if (asset.category == Category.ERC721) { if (!isSafe) IERC721(asset.assetAddress).transferFrom(source, dest, asset.id); else IERC721(asset.assetAddress).safeTransferFrom(source, dest, asset.id, ""); } else if (asset.category == Category.ERC1155) { IERC1155(asset.assetAddress).safeTransferFrom(source, dest, asset.id, asset.amount == 0 ? 1 : asset.amount, ""); } else if (asset.category == Category.CryptoKitties) { if (source == address(this)) ICryptoKitties(asset.assetAddress).transfer(dest, asset.id); else ICryptoKitties(asset.assetAddress).transferFrom(source, dest, asset.id); } else { revert("MultiToken: Unsupported category"); } } /** * getTransferAmount * @dev Get amount of asset that would be transferred. * NFTs (ERC721, CryptoKitties & ERC1155 with amount 0) with return 1. * Fungible tokens will return its amount (ERC20 with 0 amount is valid state). * In combination with `MultiToken.balanceOf`, `getTransferAmount` can be used to check successful asset transfer. * @param asset Struct defining all necessary context of a token. * @return Number of tokens that would be transferred of the asset. */ function getTransferAmount(Asset memory asset) internal pure returns (uint256) { if (asset.category == Category.ERC20) return asset.amount; else if (asset.category == Category.ERC1155 && asset.amount > 0) return asset.amount; else // Return 1 for ERC721, CryptoKitties and ERC1155 used as NFTs (amount = 0) return 1; } /*----------------------------------------------------------*| |* # TRANSFER ASSET CALLDATA *| |*----------------------------------------------------------*/ /** * transferAssetFromCalldata * @dev Wrapping function for `transferFrom` calladata on various token interfaces. * If `fromSender` is true, function `transfer` is returned instead of `transferFrom` for ERC20 category. * @param asset Struct defining all necessary context of a token. * @param source Account/address that provided the allowance. * @param dest Destination address. */ function transferAssetFromCalldata(Asset memory asset, address source, address dest, bool fromSender) pure internal returns (bytes memory) { return _transferAssetFromCalldata(asset, source, dest, fromSender, false); } /** * safeTransferAssetFromCalldata * @dev Wrapping function for `safeTransferFrom` calladata on various token interfaces. * If `fromSender` is true, function `transfer` is returned instead of `transferFrom` for ERC20 category. * @param asset Struct defining all necessary context of a token. * @param source Account/address that provided the allowance. * @param dest Destination address. */ function safeTransferAssetFromCalldata(Asset memory asset, address source, address dest, bool fromSender) pure internal returns (bytes memory) { return _transferAssetFromCalldata(asset, source, dest, fromSender, true); } function _transferAssetFromCalldata(Asset memory asset, address source, address dest, bool fromSender, bool isSafe) pure private returns (bytes memory) { if (asset.category == Category.ERC20) { if (fromSender) { return abi.encodeWithSignature( "transfer(address,uint256)", dest, asset.amount ); } else { return abi.encodeWithSignature( "transferFrom(address,address,uint256)", source, dest, asset.amount ); } } else if (asset.category == Category.ERC721) { if (!isSafe) { return abi.encodeWithSignature( "transferFrom(address,address,uint256)", source, dest, asset.id ); } else { return abi.encodeWithSignature( "safeTransferFrom(address,address,uint256,bytes)", source, dest, asset.id, "" ); } } else if (asset.category == Category.ERC1155) { return abi.encodeWithSignature( "safeTransferFrom(address,address,uint256,uint256,bytes)", source, dest, asset.id, asset.amount == 0 ? 1 : asset.amount, "" ); } else if (asset.category == Category.CryptoKitties) { if (fromSender) { return abi.encodeWithSignature( "transfer(address,uint256)", dest, asset.id ); } else { return abi.encodeWithSignature( "transferFrom(address,address,uint256)", source, dest, asset.id ); } } else { revert("MultiToken: Unsupported category"); } } /*----------------------------------------------------------*| |* # PERMIT *| |*----------------------------------------------------------*/ /** * permit * @dev Wrapping function for granting approval via permit signature. * @param asset Struct defining all necessary context of a token. * @param owner Account/address that signed the permit. * @param spender Account/address that would be granted approval to `asset`. * @param permitData Data about permit deadline (uint256) and permit signature (64/65 bytes). * Deadline and signature should be pack encoded together. * Signature can be standard (65 bytes) or compact (64 bytes) defined in EIP-2098. */ function permit(Asset memory asset, address owner, address spender, bytes memory permitData) internal { if (asset.category == Category.ERC20) { // Parse deadline and permit signature parameters uint256 deadline; bytes32 r; bytes32 s; uint8 v; // Parsing signature parameters used from OpenZeppelins ECDSA library // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/83277ff916ac4f58fec072b8f28a252c1245c2f1/contracts/utils/cryptography/ECDSA.sol // Deadline (32 bytes) + standard signature data (65 bytes) -> 97 bytes if (permitData.length == 97) { assembly { deadline := mload(add(permitData, 0x20)) r := mload(add(permitData, 0x40)) s := mload(add(permitData, 0x60)) v := byte(0, mload(add(permitData, 0x80))) } } // Deadline (32 bytes) + compact signature data (64 bytes) -> 96 bytes else if (permitData.length == 96) { bytes32 vs; assembly { deadline := mload(add(permitData, 0x20)) r := mload(add(permitData, 0x40)) vs := mload(add(permitData, 0x60)) } s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); v = uint8((uint256(vs) >> 255) + 27); } else { revert("MultiToken::Permit: Invalid permit length"); } // Call permit with parsed parameters IERC20Permit(asset.assetAddress).permit(owner, spender, asset.amount, deadline, v, r, s); } else { // Currently supporting only ERC20 signed approvals via ERC2612 revert("MultiToken::Permit: Unsupported category"); } } /*----------------------------------------------------------*| |* # BALANCE OF *| |*----------------------------------------------------------*/ /** * balanceOf * @dev Wrapping function for checking balances on various token interfaces. * @param asset Struct defining all necessary context of a token. * @param target Target address to be checked. */ function balanceOf(Asset memory asset, address target) internal view returns (uint256) { if (asset.category == Category.ERC20) { return IERC20(asset.assetAddress).balanceOf(target); } else if (asset.category == Category.ERC721) { return IERC721(asset.assetAddress).ownerOf(asset.id) == target ? 1 : 0; } else if (asset.category == Category.ERC1155) { return IERC1155(asset.assetAddress).balanceOf(target, asset.id); } else if (asset.category == Category.CryptoKitties) { return ICryptoKitties(asset.assetAddress).ownerOf(asset.id) == target ? 1 : 0; } else { revert("MultiToken: Unsupported category"); } } /*----------------------------------------------------------*| |* # APPROVE ASSET *| |*----------------------------------------------------------*/ /** * approveAsset * @dev Wrapping function for `approve` calls on various token interfaces. * By using `safeApprove` for ERC20, caller can set allowance to 0 or from 0. * Cannot set non-zero value if allowance is also non-zero. * @param asset Struct defining all necessary context of a token. * @param target Account/address that would be granted approval to `asset`. */ function approveAsset(Asset memory asset, address target) internal { if (asset.category == Category.ERC20) { IERC20(asset.assetAddress).safeApprove(target, asset.amount); } else if (asset.category == Category.ERC721) { IERC721(asset.assetAddress).approve(target, asset.id); } else if (asset.category == Category.ERC1155) { IERC1155(asset.assetAddress).setApprovalForAll(target, true); } else if (asset.category == Category.CryptoKitties) { ICryptoKitties(asset.assetAddress).approve(target, asset.id); } else { revert("MultiToken: Unsupported category"); } } /*----------------------------------------------------------*| |* # ASSET CHECKS *| |*----------------------------------------------------------*/ /** * isValid * @dev Checks that provided asset is contract, has correct format and stated category. * Fungible tokens (ERC20) have to have id = 0. * NFT (ERC721, CryptoKitties) tokens have to have amount = 0. * Correct asset category is determined via ERC165. * The check assumes, that asset contract implements only one token standard at a time. * @param asset Asset that is examined. * @return True if assets amount and id is valid in stated category. */ function isValid(Asset memory asset) internal view returns (bool) { if (asset.category == Category.ERC20) { // Check format if (asset.id != 0) return false; // ERC20 has optional ERC165 implementation if (asset.assetAddress.supportsERC165()) { // If ERC20 implements ERC165, it has to return true for its interface id return asset.assetAddress.supportsERC165InterfaceUnchecked(ERC20_INTERFACE_ID); } else { // In case token doesn't implement ERC165, its safe to assume that provided category is correct, // because any other category have to implement ERC165. // Check that asset address is contract // Tip: asset address will return code length 0, if this code is called from the asset constructor return asset.assetAddress.code.length > 0; } } else if (asset.category == Category.ERC721) { // Check format if (asset.amount != 0) return false; // Check it's ERC721 via ERC165 return asset.assetAddress.supportsInterface(ERC721_INTERFACE_ID); } else if (asset.category == Category.ERC1155) { // Check it's ERC1155 via ERC165 return asset.assetAddress.supportsInterface(ERC1155_INTERFACE_ID); } else if (asset.category == Category.CryptoKitties) { // Check format if (asset.amount != 0) return false; // Check it's CryptoKitties via ERC165 return asset.assetAddress.supportsInterface(CRYPTO_KITTIES_INTERFACE_ID); } else { revert("MultiToken: Unsupported category"); } } /** * isSameAs * @dev Compare two assets, ignoring their amounts. * @param asset First asset to examine. * @param otherAsset Second asset to examine. * @return True if both structs represents the same asset. */ function isSameAs(Asset memory asset, Asset memory otherAsset) internal pure returns (bool) { return asset.category == otherAsset.category && asset.assetAddress == otherAsset.assetAddress && asset.id == otherAsset.id; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface ICryptoKitties { // Required methods function totalSupply() external view returns (uint256 total); function balanceOf(address _owner) external view returns (uint256 balance); function ownerOf(uint256 _tokenId) external view returns (address owner); function approve(address _to, uint256 _tokenId) external; function transfer(address _to, uint256 _tokenId) external; function transferFrom(address _from, address _to, uint256 _tokenId) external; // Optional function name() external view returns (string memory name); function symbol() external view returns (string memory symbol); function tokensOfOwner(address _owner) external view returns (uint256[] memory tokenIds); function tokenMetadata(uint256 _tokenId, string memory _preferredTransport) external view returns (string memory infoUrl); // Events event Transfer(address from, address to, uint256 tokenId); event Approval(address owner, address approved, uint256 tokenId); // ERC-165 Compatibility (https://github.com/ethereum/EIPs/issues/165) // Is not part of the interface id function supportsInterface(bytes4 _interfaceID) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol) pragma solidity ^0.8.0; import "./Ownable.sol"; /** * @dev Contract module which provides access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership} and {acceptOwnership}. * * This module is used through inheritance. It will make available all functions * from parent (Ownable). */ abstract contract Ownable2Step is Ownable { address private _pendingOwner; event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner); /** * @dev Returns the address of the pending owner. */ function pendingOwner() public view virtual returns (address) { return _pendingOwner; } /** * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one. * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual override onlyOwner { _pendingOwner = newOwner; emit OwnershipTransferStarted(owner(), newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner. * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual override { delete _pendingOwner; super._transferOwnership(newOwner); } /** * @dev The new owner accepts the ownership transfer. */ function acceptOwnership() external { address sender = _msgSender(); require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner"); _transferOwnership(sender); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC1155.sol) pragma solidity ^0.8.0; import "../token/ERC1155/IERC1155.sol";
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol) pragma solidity ^0.8.0; import "../token/ERC20/IERC20.sol";
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol) pragma solidity ^0.8.0; import "../token/ERC721/IERC721.sol";
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/Initializable.sol) pragma solidity ^0.8.2; import "../../utils/Address.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in * case an upgrade adds a module that needs to be initialized. * * For example: * * [.hljs-theme-light.nopadding] * ``` * contract MyToken is ERC20Upgradeable { * function initialize() initializer public { * __ERC20_init("MyToken", "MTK"); * } * } * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable { * function initializeV2() reinitializer(2) public { * __ERC20Permit_init("MyToken"); * } * } * ``` * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. * * [CAUTION] * ==== * Avoid leaving a contract uninitialized. * * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() { * _disableInitializers(); * } * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. * @custom:oz-retyped-from bool */ uint8 private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Triggered when the contract has been initialized or reinitialized. */ event Initialized(uint8 version); /** * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope, * `onlyInitializing` functions can be used to initialize parent contracts. * * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a * constructor. * * Emits an {Initialized} event. */ modifier initializer() { bool isTopLevelCall = !_initializing; require( (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1), "Initializable: contract is already initialized" ); _initialized = 1; if (isTopLevelCall) { _initializing = true; } _; if (isTopLevelCall) { _initializing = false; emit Initialized(1); } } /** * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be * used to initialize parent contracts. * * A reinitializer may be used after the original initialization step. This is essential to configure modules that * are added through upgrades and that require initialization. * * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer` * cannot be nested. If one is invoked in the context of another, execution will revert. * * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in * a contract, executing them in the right order is up to the developer or operator. * * WARNING: setting the version to 255 will prevent any future reinitialization. * * Emits an {Initialized} event. */ modifier reinitializer(uint8 version) { require(!_initializing && _initialized < version, "Initializable: contract is already initialized"); _initialized = version; _initializing = true; _; _initializing = false; emit Initialized(version); } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} and {reinitializer} modifiers, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } /** * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call. * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized * to any version. It is recommended to use this to lock implementation contracts that are designed to be called * through proxies. * * Emits an {Initialized} event the first time it is successfully executed. */ function _disableInitializers() internal virtual { require(!_initializing, "Initializable: contract is initializing"); if (_initialized < type(uint8).max) { _initialized = type(uint8).max; emit Initialized(type(uint8).max); } } /** * @dev Returns the highest version that has been initialized. See {reinitializer}. */ function _getInitializedVersion() internal view returns (uint8) { return _initialized; } /** * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}. */ function _isInitializing() internal view returns (bool) { return _initializing; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC1155 compliant contract, as defined in the * https://eips.ethereum.org/EIPS/eip-1155[EIP]. * * _Available since v3.1._ */ interface IERC1155 is IERC165 { /** * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`. */ event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value); /** * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all * transfers. */ event TransferBatch( address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values ); /** * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to * `approved`. */ event ApprovalForAll(address indexed account, address indexed operator, bool approved); /** * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI. * * If an {URI} event was emitted for `id`, the standard * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value * returned by {IERC1155MetadataURI-uri}. */ event URI(string value, uint256 indexed id); /** * @dev Returns the amount of tokens of token type `id` owned by `account`. * * Requirements: * * - `account` cannot be the zero address. */ function balanceOf(address account, uint256 id) external view returns (uint256); /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}. * * Requirements: * * - `accounts` and `ids` must have the same length. */ function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory); /** * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`, * * Emits an {ApprovalForAll} event. * * Requirements: * * - `operator` cannot be the caller. */ function setApprovalForAll(address operator, bool approved) external; /** * @dev Returns true if `operator` is approved to transfer ``account``'s tokens. * * See {setApprovalForAll}. */ function isApprovedForAll(address account, address operator) external view returns (bool); /** * @dev Transfers `amount` tokens of token type `id` from `from` to `to`. * * Emits a {TransferSingle} event. * * Requirements: * * - `to` cannot be the zero address. * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}. * - `from` must have a balance of tokens of type `id` of at least `amount`. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the * acceptance magic value. */ function safeTransferFrom( address from, address to, uint256 id, uint256 amount, bytes calldata data ) external; /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}. * * Emits a {TransferBatch} event. * * Requirements: * * - `ids` and `amounts` must have the same length. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the * acceptance magic value. */ function safeBatchTransferFrom( address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev _Available since v3.1._ */ interface IERC1155Receiver is IERC165 { /** * @dev Handles the receipt of a single ERC1155 token type. This function is * called at the end of a `safeTransferFrom` after the balance has been updated. * * NOTE: To accept the transfer, this must return * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` * (i.e. 0xf23a6e61, or its own function selector). * * @param operator The address which initiated the transfer (i.e. msg.sender) * @param from The address which previously owned the token * @param id The ID of the token being transferred * @param value The amount of tokens being transferred * @param data Additional data with no specified format * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed */ function onERC1155Received( address operator, address from, uint256 id, uint256 value, bytes calldata data ) external returns (bytes4); /** * @dev Handles the receipt of a multiple ERC1155 token types. This function * is called at the end of a `safeBatchTransferFrom` after the balances have * been updated. * * NOTE: To accept the transfer(s), this must return * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` * (i.e. 0xbc197c81, or its own function selector). * * @param operator The address which initiated the batch transfer (i.e. msg.sender) * @param from The address which previously owned the token * @param ids An array containing ids of each token being transferred (order and length must match values array) * @param values An array containing amounts of each token being transferred (order and length must match ids array) * @param data Additional data with no specified format * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed */ function onERC1155BatchReceived( address operator, address from, uint256[] calldata ids, uint256[] calldata values, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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); /** * @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 `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.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)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @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: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: address zero is not a valid owner"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _ownerOf(tokenId); require(owner != address(0), "ERC721: invalid token ID"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { _requireMinted(tokenId); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overridden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not token owner or approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { _requireMinted(tokenId); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved"); _safeTransfer(from, to, tokenId, data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist */ function _ownerOf(uint256 tokenId) internal view virtual returns (address) { return _owners[tokenId]; } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _ownerOf(tokenId) != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { address owner = ERC721.ownerOf(tokenId); return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId, 1); // Check that tokenId was not minted by `_beforeTokenTransfer` hook require(!_exists(tokenId), "ERC721: token already minted"); unchecked { // Will not overflow unless all 2**256 token ids are minted to the same owner. // Given that tokens are minted one by one, it is impossible in practice that // this ever happens. Might change if we allow batch minting. // The ERC fails to describe this case. _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId, 1); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * This is an internal function that does not check if the sender is authorized to operate on the token. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId, 1); // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook owner = ERC721.ownerOf(tokenId); // Clear approvals delete _tokenApprovals[tokenId]; unchecked { // Cannot overflow, as that would require more tokens to be burned/transferred // out than the owner initially received through minting and transferring in. _balances[owner] -= 1; } delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId, 1); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId, 1); // Check that tokenId was not transferred by `_beforeTokenTransfer` hook require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner"); // Clear approvals from the previous owner delete _tokenApprovals[tokenId]; unchecked { // `_balances[from]` cannot overflow for the same reason as described in `_burn`: // `from`'s balance is the number of token held, which is at least one before the current // transfer. // `_balances[to]` could overflow in the conditions described in `_mint`. That would require // all 2**256 token ids to be minted, which in practice is impossible. _balances[from] -= 1; _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId, 1); } /** * @dev Approve `to` to operate on `tokenId` * * Emits an {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits an {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Reverts if the `tokenId` has not been minted yet. */ function _requireMinted(uint256 tokenId) internal view virtual { require(_exists(tokenId), "ERC721: invalid token ID"); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`. * - When `from` is zero, the tokens will be minted for `to`. * - When `to` is zero, ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256, /* firstTokenId */ uint256 batchSize ) internal virtual { if (batchSize > 1) { if (from != address(0)) { _balances[from] -= batchSize; } if (to != address(0)) { _balances[to] += batchSize; } } } /** * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`. * - When `from` is zero, the tokens were minted for `to`. * - When `to` is zero, ``from``'s tokens were burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol) pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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 * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 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 functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-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 (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 (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @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] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/introspection/ERC165Checker.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Library used to query support of an interface declared via {IERC165}. * * Note that these functions return the actual result of the query: they do not * `revert` if an interface is not supported. It is up to the caller to decide * what to do in these cases. */ library ERC165Checker { // As per the EIP-165 spec, no interface should ever match 0xffffffff bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff; /** * @dev Returns true if `account` supports the {IERC165} interface. */ function supportsERC165(address account) internal view returns (bool) { // Any contract that implements ERC165 must explicitly indicate support of // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid return supportsERC165InterfaceUnchecked(account, type(IERC165).interfaceId) && !supportsERC165InterfaceUnchecked(account, _INTERFACE_ID_INVALID); } /** * @dev Returns true if `account` supports the interface defined by * `interfaceId`. Support for {IERC165} itself is queried automatically. * * See {IERC165-supportsInterface}. */ function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) { // query support of both ERC165 as per the spec and support of _interfaceId return supportsERC165(account) && supportsERC165InterfaceUnchecked(account, interfaceId); } /** * @dev Returns a boolean array where each value corresponds to the * interfaces passed in and whether they're supported or not. This allows * you to batch check interfaces for a contract where your expectation * is that some interfaces may not be supported. * * See {IERC165-supportsInterface}. * * _Available since v3.4._ */ function getSupportedInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool[] memory) { // an array of booleans corresponding to interfaceIds and whether they're supported or not bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length); // query support of ERC165 itself if (supportsERC165(account)) { // query support of each interface in interfaceIds for (uint256 i = 0; i < interfaceIds.length; i++) { interfaceIdsSupported[i] = supportsERC165InterfaceUnchecked(account, interfaceIds[i]); } } return interfaceIdsSupported; } /** * @dev Returns true if `account` supports all the interfaces defined in * `interfaceIds`. Support for {IERC165} itself is queried automatically. * * Batch-querying can lead to gas savings by skipping repeated checks for * {IERC165} support. * * See {IERC165-supportsInterface}. */ function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) { // query support of ERC165 itself if (!supportsERC165(account)) { return false; } // query support of each interface in interfaceIds for (uint256 i = 0; i < interfaceIds.length; i++) { if (!supportsERC165InterfaceUnchecked(account, interfaceIds[i])) { return false; } } // all interfaces supported return true; } /** * @notice Query if a contract implements an interface, does not check ERC165 support * @param account The address of the contract to query for support of an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @return true if the contract at account indicates support of the interface with * identifier interfaceId, false otherwise * @dev Assumes that account contains a contract that supports ERC165, otherwise * the behavior of this method is undefined. This precondition can be checked * with {supportsERC165}. * Interface identification is specified in ERC-165. */ function supportsERC165InterfaceUnchecked(address account, bytes4 interfaceId) internal view returns (bool) { // prepare call bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId); // perform static call bool success; uint256 returnSize; uint256 returnValue; assembly { success := staticcall(30000, account, add(encodedParams, 0x20), mload(encodedParams), 0x00, 0x20) returnSize := returndatasize() returnValue := mload(0x00) } return success && returnSize >= 0x20 && returnValue > 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 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) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 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. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // 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 x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; // Access control error CallerMissingHubTag(bytes32); // Loan contract error LoanDefaulted(uint40); error InvalidLoanStatus(uint256); error NonExistingLoan(); error CallerNotLOANTokenHolder(); error InvalidExtendedExpirationDate(); // Invalid asset error InvalidLoanAsset(); error InvalidCollateralAsset(); // LOAN token error InvalidLoanContractCaller(); // Vault error UnsupportedTransferFunction(); error IncompleteTransfer(); // Nonce error NonceAlreadyRevoked(); error InvalidMinNonce(); // Signature checks error InvalidSignatureLength(uint256); error InvalidSignature(); // Offer error CallerIsNotStatedBorrower(address); error OfferExpired(); error CollateralIdIsNotWhitelisted(); // Request error CallerIsNotStatedLender(address); error RequestExpired(); // Request & Offer error InvalidDuration(); // Input data error InvalidInputData(); // Config error InvalidFeeValue(); error InvalidFeeCollector();
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "openzeppelin-contracts/contracts/access/Ownable2Step.sol"; import "openzeppelin-contracts/contracts/proxy/utils/Initializable.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN Config * @notice Contract holding configurable values of PWN protocol. * @dev Is intendet to be used as a proxy via `TransparentUpgradeableProxy`. */ contract PWNConfig is Ownable2Step, Initializable { string internal constant VERSION = "1.0"; /*----------------------------------------------------------*| |* # VARIABLES & CONSTANTS DEFINITIONS *| |*----------------------------------------------------------*/ uint16 public constant MAX_FEE = 1000; // 10% /** * @notice Protocol fee value in basis points. * @dev Value of 100 is 1% fee. */ uint16 public fee; /** * @notice Address that collects protocol fees. */ address public feeCollector; /** * @notice Mapping of a loan contract address to LOAN token metadata uri. * @dev LOAN token minted by a loan contract will return metadata uri stored in this mapping. */ mapping (address => string) public loanMetadataUri; /*----------------------------------------------------------*| |* # EVENTS & ERRORS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Emitted when new fee value is set. */ event FeeUpdated(uint16 oldFee, uint16 newFee); /** * @dev Emitted when new fee collector address is set. */ event FeeCollectorUpdated(address oldFeeCollector, address newFeeCollector); /** * @dev Emitted when new LOAN token metadata uri is set. */ event LoanMetadataUriUpdated(address indexed loanContract, string newUri); /*----------------------------------------------------------*| |* # CONSTRUCTOR *| |*----------------------------------------------------------*/ constructor() Ownable2Step() { } function initialize(address _owner, uint16 _fee, address _feeCollector) initializer external { require(_owner != address(0), "Owner is zero address"); _transferOwnership(_owner); require(_feeCollector != address(0), "Fee collector is zero address"); _setFeeCollector(_feeCollector); _setFee(_fee); } /*----------------------------------------------------------*| |* # FEE MANAGEMENT *| |*----------------------------------------------------------*/ /** * @notice Set new protocol fee value. * @dev Only contract owner can call this function. * @param _fee New fee value in basis points. Value of 100 is 1% fee. */ function setFee(uint16 _fee) external onlyOwner { _setFee(_fee); } function _setFee(uint16 _fee) private { if (_fee > MAX_FEE) revert InvalidFeeValue(); uint16 oldFee = fee; fee = _fee; emit FeeUpdated(oldFee, _fee); } /** * @notice Set new fee collector address. * @dev Only contract owner can call this function. * @param _feeCollector New fee collector address. */ function setFeeCollector(address _feeCollector) external onlyOwner { _setFeeCollector(_feeCollector); } function _setFeeCollector(address _feeCollector) private { if (_feeCollector == address(0)) revert InvalidFeeCollector(); address oldFeeCollector = feeCollector; feeCollector = _feeCollector; emit FeeCollectorUpdated(oldFeeCollector, _feeCollector); } /*----------------------------------------------------------*| |* # LOAN METADATA MANAGEMENT *| |*----------------------------------------------------------*/ /** * @notice Set a LOAN token metadata uri for a specific loan contract. * @param loanContract Address of a loan contract. * @param metadataUri New value of LOAN token metadata uri for given `loanContract`. */ function setLoanMetadataUri(address loanContract, string memory metadataUri) external onlyOwner { loanMetadataUri[loanContract] = metadataUri; emit LoanMetadataUriUpdated(loanContract, metadataUri); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "openzeppelin-contracts/contracts/access/Ownable2Step.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN Hub * @notice Connects PWN contracts together into protocol via tags. */ contract PWNHub is Ownable2Step { /*----------------------------------------------------------*| |* # VARIABLES & CONSTANTS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Mapping of address tags. (contract address => tag => is tagged) */ mapping (address => mapping (bytes32 => bool)) private tags; /*----------------------------------------------------------*| |* # EVENTS & ERRORS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Emitted when tag is set for an address. */ event TagSet(address indexed _address, bytes32 indexed tag, bool hasTag); /*----------------------------------------------------------*| |* # CONSTRUCTOR *| |*----------------------------------------------------------*/ constructor() Ownable2Step() { } /*----------------------------------------------------------*| |* # TAG MANAGEMENT *| |*----------------------------------------------------------*/ /** * @notice Set tag to an address. * @dev Tag can be added or removed via this functions. Only callable by contract owner. * @param _address Address to which a tag is set. * @param tag Tag that is set to an `_address`. * @param _hasTag Bool value if tag is added or removed. */ function setTag(address _address, bytes32 tag, bool _hasTag) public onlyOwner { tags[_address][tag] = _hasTag; emit TagSet(_address, tag, _hasTag); } /** * @notice Set list of tags to an address. * @dev Tags can be added or removed via this functions. Only callable by contract owner. * @param _addresses List of addresses to which tags are set. * @param _tags List of tags that are set to an `_address`. * @param _hasTag Bool value if tags are added or removed. */ function setTags(address[] memory _addresses, bytes32[] memory _tags, bool _hasTag) external onlyOwner { if (_addresses.length != _tags.length) revert InvalidInputData(); uint256 length = _tags.length; for (uint256 i; i < length;) { setTag(_addresses[i], _tags[i], _hasTag); unchecked { ++i; } } } /*----------------------------------------------------------*| |* # TAG GETTER *| |*----------------------------------------------------------*/ /** * @dev Return if an address is associated with a tag. * @param _address Address that is examined for a `tag`. * @param tag Tag that should an `_address` be associated with. * @return True if given address has a tag. */ function hasTag(address _address, bytes32 tag) external view returns (bool) { return tags[_address][tag]; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "@pwn/hub/PWNHub.sol"; import "@pwn/hub/PWNHubTags.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN Hub Access Control * @notice Implement modifiers for PWN Hub access control. */ abstract contract PWNHubAccessControl { /*----------------------------------------------------------*| |* # VARIABLES & CONSTANTS DEFINITIONS *| |*----------------------------------------------------------*/ PWNHub immutable internal hub; /*----------------------------------------------------------*| |* # MODIFIERS *| |*----------------------------------------------------------*/ modifier onlyActiveLoan() { if (hub.hasTag(msg.sender, PWNHubTags.ACTIVE_LOAN) == false) revert CallerMissingHubTag(PWNHubTags.ACTIVE_LOAN); _; } modifier onlyWithTag(bytes32 tag) { if (hub.hasTag(msg.sender, tag) == false) revert CallerMissingHubTag(tag); _; } /*----------------------------------------------------------*| |* # CONSTRUCTOR *| |*----------------------------------------------------------*/ constructor(address pwnHub) { hub = PWNHub(pwnHub); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; library PWNHubTags { string internal constant VERSION = "1.0"; /// @dev Address can mint LOAN tokens and create LOANs via loan factory contracts. bytes32 internal constant ACTIVE_LOAN = keccak256("PWN_ACTIVE_LOAN"); /// @dev Address can be used as a loan terms factory for creating simple loans. bytes32 internal constant SIMPLE_LOAN_TERMS_FACTORY = keccak256("PWN_SIMPLE_LOAN_TERMS_FACTORY"); /// @dev Address can revoke loan request nonces. bytes32 internal constant LOAN_REQUEST = keccak256("PWN_LOAN_REQUEST"); /// @dev Address can revoke loan offer nonces. bytes32 internal constant LOAN_OFFER = keccak256("PWN_LOAN_OFFER"); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "MultiToken/MultiToken.sol"; import "openzeppelin-contracts/contracts/token/ERC721/IERC721Receiver.sol"; import "openzeppelin-contracts/contracts/token/ERC1155/IERC1155Receiver.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN Vault * @notice Base contract for transferring and managing collateral and loan assets in PWN protocol. * @dev Loan contracts inherits PWN Vault to act as a Vault for its loan type. */ abstract contract PWNVault is IERC721Receiver, IERC1155Receiver { using MultiToken for MultiToken.Asset; /*----------------------------------------------------------*| |* # EVENTS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Emitted when asset transfer happens from an `origin` address to a vault. */ event VaultPull(MultiToken.Asset asset, address indexed origin); /** * @dev Emitted when asset transfer happens from a vault to a `beneficiary` address. */ event VaultPush(MultiToken.Asset asset, address indexed beneficiary); /** * @dev Emitted when asset transfer happens from an `origin` address to a `beneficiary` address. */ event VaultPushFrom(MultiToken.Asset asset, address indexed origin, address indexed beneficiary); /*----------------------------------------------------------*| |* # TRANSFER FUNCTIONS *| |*----------------------------------------------------------*/ /** * pull * @dev Function accessing an asset and pulling it INTO a vault. * The function assumes a prior token approval was made to a vault address. * @param asset An asset construct - for a definition see { MultiToken dependency lib }. * @param origin Borrower address that is transferring collateral to Vault or repaying a loan. */ function _pull(MultiToken.Asset memory asset, address origin) internal { uint256 originalBalance = asset.balanceOf(address(this)); asset.transferAssetFrom(origin, address(this)); _checkTransfer(asset, originalBalance, address(this)); emit VaultPull(asset, origin); } /** * push * @dev Function pushing an asset FROM a vault TO a defined recipient. * This is used for claiming a paid back loan or a defaulted collateral, or returning collateral to a borrower. * @param asset An asset construct - for a definition see { MultiToken dependency lib }. * @param beneficiary An address of a recipient of an asset. */ function _push(MultiToken.Asset memory asset, address beneficiary) internal { uint256 originalBalance = asset.balanceOf(beneficiary); asset.safeTransferAssetFrom(address(this), beneficiary); _checkTransfer(asset, originalBalance, beneficiary); emit VaultPush(asset, beneficiary); } /** * pushFrom * @dev Function pushing an asset FROM a lender TO a borrower. * The function assumes a prior token approval was made to a vault address. * @param asset An asset construct - for a definition see { MultiToken dependency lib }. * @param origin An address of a lender who is providing a loan asset. * @param beneficiary An address of the recipient of an asset. */ function _pushFrom(MultiToken.Asset memory asset, address origin, address beneficiary) internal { uint256 originalBalance = asset.balanceOf(beneficiary); asset.safeTransferAssetFrom(origin, beneficiary); _checkTransfer(asset, originalBalance, beneficiary); emit VaultPushFrom(asset, origin, beneficiary); } function _checkTransfer(MultiToken.Asset memory asset, uint256 originalBalance, address recipient) private view { if (originalBalance + asset.getTransferAmount() != asset.balanceOf(recipient)) revert IncompleteTransfer(); } /*----------------------------------------------------------*| |* # PERMIT *| |*----------------------------------------------------------*/ /** * permit * @dev Function uses signed permit data to set vaults allowance for an asset. * @param asset An asset construct - for a definition see { MultiToken dependency lib }. * @param origin An address who is approving an asset. * @param permit Data about permit deadline (uint256) and permit signature (64/65 bytes). * Deadline and signature should be pack encoded together. * Signature can be standard (65 bytes) or compact (64 bytes) defined in EIP-2098. */ function _permit(MultiToken.Asset memory asset, address origin, bytes memory permit) internal { if (permit.length > 0) asset.permit(origin, address(this), permit); } /*----------------------------------------------------------*| |* # ERC721/1155 RECEIVED HOOKS *| |*----------------------------------------------------------*/ /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * @return `IERC721Receiver.onERC721Received.selector` if transfer is allowed */ function onERC721Received( address operator, address /*from*/, uint256 /*tokenId*/, bytes calldata /*data*/ ) override external view returns (bytes4) { if (operator != address(this)) revert UnsupportedTransferFunction(); return IERC721Receiver.onERC721Received.selector; } /** * @dev Handles the receipt of a single ERC1155 token type. This function is * called at the end of a `safeTransferFrom` after the balance has been updated. * To accept the transfer, this must return * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` * (i.e. 0xf23a6e61, or its own function selector). * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed */ function onERC1155Received( address operator, address /*from*/, uint256 /*id*/, uint256 /*value*/, bytes calldata /*data*/ ) override external view returns (bytes4) { if (operator != address(this)) revert UnsupportedTransferFunction(); return IERC1155Receiver.onERC1155Received.selector; } /** * @dev Handles the receipt of a multiple ERC1155 token types. This function * is called at the end of a `safeBatchTransferFrom` after the balances have * been updated. To accept the transfer(s), this must return * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` * (i.e. 0xbc197c81, or its own function selector). * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed */ function onERC1155BatchReceived( address /*operator*/, address /*from*/, uint256[] calldata /*ids*/, uint256[] calldata /*values*/, bytes calldata /*data*/ ) override external pure returns (bytes4) { revert UnsupportedTransferFunction(); } /*----------------------------------------------------------*| |* # SUPPORTED INTERFACES *| |*----------------------------------------------------------*/ /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external pure virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId || interfaceId == type(IERC721Receiver).interfaceId || interfaceId == type(IERC1155Receiver).interfaceId; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; /** * @title PWN Fee Calculator * @notice Library that calculates fee amount for given loan amount. */ library PWNFeeCalculator { string internal constant VERSION = "1.0"; /** * @notice Compute fee amount. * @param fee Fee value in basis points. Value of 100 is 1% fee. * @param loanAmount Amount of an asset used as a loan credit. * @return feeAmount Amount of a loan asset that represents a protocol fee. * @return newLoanAmount New amount of a loan credit asset, after deducting protocol fee. */ function calculateFeeAmount(uint16 fee, uint256 loanAmount) internal pure returns (uint256 feeAmount, uint256 newLoanAmount) { if (fee == 0) return (0, loanAmount); unchecked { if ((loanAmount * fee) / fee == loanAmount) feeAmount = loanAmount * uint256(fee) / 1e4; else feeAmount = loanAmount / 1e4 * uint256(fee); } newLoanAmount = loanAmount - feeAmount; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "MultiToken/MultiToken.sol"; library PWNLOANTerms { /** * @notice Struct defining a simple loan terms. * @dev This struct is created by loan factories and never stored. * @param lender Address of a lender. * @param borrower Address of a borrower. * @param expiration Unix timestamp (in seconds) setting up a default date. * @param collateral Asset used as a loan collateral. For a definition see { MultiToken dependency lib }. * @param asset Asset used as a loan credit. For a definition see { MultiToken dependency lib }. * @param loanRepayAmount Amount of a loan asset to be paid back. */ struct Simple { address lender; address borrower; uint40 expiration; MultiToken.Asset collateral; MultiToken.Asset asset; uint256 loanRepayAmount; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "@pwn/loan/terms/PWNLOANTerms.sol"; /** * @title PWN Simple Loan Terms Factory Interface * @notice Interface of a loan factory contract that builds a simple loan terms. */ abstract contract PWNSimpleLoanTermsFactory { uint32 public constant MIN_LOAN_DURATION = 600; // 10 min /** * @notice Build a simple loan terms from given data. * @dev This function should be called only by contracts working with simple loan terms. * @param caller Caller of a create loan function on a loan contract. * @param factoryData Encoded data for a loan terms factory. * @param signature Signed loan factory data. * @return loanTerms Simple loan terms struct created from a loan factory data. */ function createLOANTerms( address caller, bytes calldata factoryData, bytes calldata signature ) external virtual returns (PWNLOANTerms.Simple memory loanTerms); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; /** * @dev Interface of the ERC5646 standard, as defined in the https://eips.ethereum.org/EIPS/eip-5646. */ interface IERC5646 { /** * @notice Function to return current token state fingerprint. * @param tokenId Id of a token state in question. * @return Current token state fingerprint. */ function getStateFingerprint(uint256 tokenId) external view returns (bytes32); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; /** * @title PWN Loan Metadata Provider * @notice Interface for a provider of a LOAN token metadata. * @dev Loan contracts should implement this interface. */ interface IPWNLoanMetadataProvider { /** * @notice Get a loan metadata uri for a LOAN token minted by this contract. * @return LOAN token metadata uri. */ function loanMetadataUri() external view returns (string memory); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.8.16; import "openzeppelin-contracts/contracts/token/ERC721/ERC721.sol"; import "@pwn/hub/PWNHubAccessControl.sol"; import "@pwn/loan/token/IERC5646.sol"; import "@pwn/loan/token/IPWNLoanMetadataProvider.sol"; import "@pwn/PWNErrors.sol"; /** * @title PWN LOAN token * @notice A LOAN token representing a loan in PWN protocol. * @dev Token doesn't hold any loan logic, just an address of a loan contract that minted the LOAN token. * PWN LOAN token is shared between all loan contracts. */ contract PWNLOAN is PWNHubAccessControl, IERC5646, ERC721 { /*----------------------------------------------------------*| |* # VARIABLES & CONSTANTS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Last used LOAN id. First LOAN id is 1. This value is incremental. */ uint256 public lastLoanId; /** * @dev Mapping of a LOAN id to a loan contract that minted the LOAN token. */ mapping (uint256 => address) public loanContract; /*----------------------------------------------------------*| |* # EVENTS DEFINITIONS *| |*----------------------------------------------------------*/ /** * @dev Emitted when a new LOAN token is minted. */ event LOANMinted(uint256 indexed loanId, address indexed loanContract, address indexed owner); /** * @dev Emitted when a LOAN token is burned. */ event LOANBurned(uint256 indexed loanId); /*----------------------------------------------------------*| |* # CONSTRUCTOR *| |*----------------------------------------------------------*/ constructor(address hub) PWNHubAccessControl(hub) ERC721("PWN LOAN", "LOAN") { } /*----------------------------------------------------------*| |* # TOKEN LIFECYCLE *| |*----------------------------------------------------------*/ /** * @notice Mint a new LOAN token. * @dev Only an address with associated `ACTIVE_LOAN` tag in PWN Hub can call this function. * @param owner Address of a LOAN token receiver. * @return loanId Id of a newly minted LOAN token. */ function mint(address owner) external onlyActiveLoan returns (uint256 loanId) { loanId = ++lastLoanId; loanContract[loanId] = msg.sender; _mint(owner, loanId); emit LOANMinted(loanId, msg.sender, owner); } /** * @notice Burn a LOAN token. * @dev Any address that is associated with given loan id can call this function. * It is enabled to let deprecated loan contracts repay and claim existing loans. * @param loanId Id of a LOAN token to be burned. */ function burn(uint256 loanId) external { if (loanContract[loanId] != msg.sender) revert InvalidLoanContractCaller(); delete loanContract[loanId]; _burn(loanId); emit LOANBurned(loanId); } /*----------------------------------------------------------*| |* # METADATA *| |*----------------------------------------------------------*/ /** * @notice Return a LOAN token metadata uri base on a loan contract that minted the token. * @param tokenId Id of a LOAN token. * @return Metadata uri for given token id (loan id). */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { _requireMinted(tokenId); return IPWNLoanMetadataProvider(loanContract[tokenId]).loanMetadataUri(); } /*----------------------------------------------------------*| |* # ERC5646 *| |*----------------------------------------------------------*/ /** * @dev See {IERC5646-getStateFingerprint}. */ function getStateFingerprint(uint256 tokenId) external view virtual override returns (bytes32) { address _loanContract = loanContract[tokenId]; if (_loanContract == address(0)) return bytes32(0); return IERC5646(_loanContract).getStateFingerprint(tokenId); } /*----------------------------------------------------------*| |* # ERC165 *| |*----------------------------------------------------------*/ /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return super.supportsInterface(interfaceId) || interfaceId == type(IERC5646).interfaceId; } }
{ "remappings": [ "@MT/=lib/MultiToken/src/", "@openzeppelin/=lib/openzeppelin-contracts/contracts/", "@pwn-test/=test/", "@pwn/=src/", "MultiToken/=lib/MultiToken/src/", "ds-test/=lib/forge-std/lib/ds-test/src/", "forge-std/=lib/forge-std/src/", "openzeppelin-contracts/=lib/openzeppelin-contracts/" ], "optimizer": { "enabled": true, "runs": 200 }, "metadata": { "bytecodeHash": "ipfs" }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "london", "libraries": {} }
Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"_hub","type":"address"},{"internalType":"address","name":"_loanToken","type":"address"},{"internalType":"address","name":"_config","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"CallerMissingHubTag","type":"error"},{"inputs":[],"name":"CallerNotLOANTokenHolder","type":"error"},{"inputs":[],"name":"IncompleteTransfer","type":"error"},{"inputs":[],"name":"InvalidCollateralAsset","type":"error"},{"inputs":[],"name":"InvalidExtendedExpirationDate","type":"error"},{"inputs":[],"name":"InvalidLoanAsset","type":"error"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"InvalidLoanStatus","type":"error"},{"inputs":[{"internalType":"uint40","name":"","type":"uint40"}],"name":"LoanDefaulted","type":"error"},{"inputs":[],"name":"NonExistingLoan","type":"error"},{"inputs":[],"name":"UnsupportedTransferFunction","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"loanId","type":"uint256"},{"indexed":true,"internalType":"bool","name":"defaulted","type":"bool"}],"name":"LOANClaimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"loanId","type":"uint256"},{"components":[{"internalType":"address","name":"lender","type":"address"},{"internalType":"address","name":"borrower","type":"address"},{"internalType":"uint40","name":"expiration","type":"uint40"},{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct MultiToken.Asset","name":"collateral","type":"tuple"},{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct MultiToken.Asset","name":"asset","type":"tuple"},{"internalType":"uint256","name":"loanRepayAmount","type":"uint256"}],"indexed":false,"internalType":"struct PWNLOANTerms.Simple","name":"terms","type":"tuple"}],"name":"LOANCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"loanId","type":"uint256"},{"indexed":false,"internalType":"uint40","name":"extendedExpirationDate","type":"uint40"}],"name":"LOANExpirationDateExtended","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"loanId","type":"uint256"}],"name":"LOANPaidBack","type":"event"},{"anonymous":false,"inputs":[{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"indexed":false,"internalType":"struct MultiToken.Asset","name":"asset","type":"tuple"},{"indexed":true,"internalType":"address","name":"origin","type":"address"}],"name":"VaultPull","type":"event"},{"anonymous":false,"inputs":[{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"indexed":false,"internalType":"struct MultiToken.Asset","name":"asset","type":"tuple"},{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"}],"name":"VaultPush","type":"event"},{"anonymous":false,"inputs":[{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"indexed":false,"internalType":"struct MultiToken.Asset","name":"asset","type":"tuple"},{"indexed":true,"internalType":"address","name":"origin","type":"address"},{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"}],"name":"VaultPushFrom","type":"event"},{"inputs":[],"name":"MAX_EXPIRATION_EXTENSION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanId","type":"uint256"}],"name":"claimLOAN","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"loanTermsFactoryContract","type":"address"},{"internalType":"bytes","name":"loanTermsFactoryData","type":"bytes"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"bytes","name":"loanAssetPermit","type":"bytes"},{"internalType":"bytes","name":"collateralPermit","type":"bytes"}],"name":"createLOAN","outputs":[{"internalType":"uint256","name":"loanId","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanId","type":"uint256"},{"internalType":"uint40","name":"extendedExpirationDate","type":"uint40"}],"name":"extendLOANExpirationDate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanId","type":"uint256"}],"name":"getLOAN","outputs":[{"components":[{"internalType":"uint8","name":"status","type":"uint8"},{"internalType":"address","name":"borrower","type":"address"},{"internalType":"uint40","name":"expiration","type":"uint40"},{"internalType":"address","name":"loanAssetAddress","type":"address"},{"internalType":"uint256","name":"loanRepayAmount","type":"uint256"},{"components":[{"internalType":"enum MultiToken.Category","name":"category","type":"uint8"},{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct MultiToken.Asset","name":"collateral","type":"tuple"}],"internalType":"struct PWNSimpleLoan.LOAN","name":"loan","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getStateFingerprint","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"loanMetadataUri","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanId","type":"uint256"},{"internalType":"bytes","name":"loanAssetPermit","type":"bytes"}],"name":"repayLOAN","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000037807a2f031b3b44081f4b21500e5d70ebadadd50000000000000000000000004440c069272cc34b80c7b11bee657d0349ba9c2300000000000000000000000003deafc9678ab25f059df59be3b20875018e1d46
-----Decoded View---------------
Arg [0] : _hub (address): 0x37807A2F031b3B44081F4b21500E5D70EbaDAdd5
Arg [1] : _loanToken (address): 0x4440C069272cC34b80C7B11bEE657D0349Ba9C23
Arg [2] : _config (address): 0x03DeAfC9678ab25F059df59Be3B20875018e1d46
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000037807a2f031b3b44081f4b21500e5d70ebadadd5
Arg [1] : 0000000000000000000000004440c069272cc34b80c7b11bee657d0349ba9c23
Arg [2] : 00000000000000000000000003deafc9678ab25f059df59be3b20875018e1d46
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Multichain Portfolio | 27 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
POL | 100.00% | $0.397248 | 0.5001 | $0.1986 |
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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.