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ERC-721
NFT
Overview
Max Total Supply
21,000 CT
Holders
9,438
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 CTLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
CryptoTrunks
Compiler Version
v0.6.6+commit.6c089d02
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.6.6; // Truffle import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "@chainlink/contracts/v0.6/ChainlinkClient.sol"; // import "@chainlink/contracts/src/v0.6/VRFConsumerBase.sol"; // Modified VRFConsumerBase to not conflict with ChainlinkClient. import "./VRFConsumerBase.sol"; // Remix //import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/token/ERC721/ERC721.sol"; //import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/access/Ownable.sol"; //import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/utils/Counters.sol"; //import "https://github.com/smartcontractkit/chainlink/blob/develop/evm-contracts/src/v0.6/ChainlinkClient.sol"; //import "https://github.com/smartcontractkit/chainlink/blob/develop/evm-contracts/src/v0.6/VRFConsumerBase.sol"; contract CryptoTrunks is ERC721, Ownable, ChainlinkClient, VRFConsumerBase { using Counters for Counters.Counter; // Pausable. bool private _paused; // Represents a minting user, for lookup from Chainlink fulfill. struct User { uint256 tokenId; address addr; } // Generative uint16 constant private generativeSupply = 19500; Counters.Counter private generativeMinted; // Genesis uint16 constant private genesisSupply = 1500; Counters.Counter private genesisMinted; uint256 constant private genesisPrime = 22801763477; // Prime chosen at random (10 millionth) // Chainlink internals. address private oracle; bytes32 private jobId; uint256 private fee; // Chainlink VRF constants. bytes32 internal keyHash; uint256 internal vrfFee; // Returned from VRF. uint256 private genesisRandomSeed; // Mapping from Chainlink `requestId` to the user who triggered it. mapping (bytes32 => User) private users; // Mapping from address to the fee the user will pay next. mapping (address => uint256) private nextFeeTiers; // Mapping from address to minted count. mapping (address => uint16) private mintedCount; // Events event RemoteMintFulfilled(bytes32 requestId, uint256 tokenId, uint256 resultId); event RemoteMintTwentyFulfilled(bytes32 requestId, uint256 firstTokenId, uint256 resultId); /** * Constructor */ // TODO: Change VRFConsumerBase to mainnet . constructor() public ERC721("CryptoTrunks", "CT") VRFConsumerBase( 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952, // VRF Coordinator 0x514910771AF9Ca656af840dff83E8264EcF986CA // LINK Token ) { // Metadata setup. _setBaseURI("https://service.cryptotrunks.co/token/"); // Chainlink setup. setPublicChainlinkToken(); // Our node // oracle = 0xDAca12D022D5fe11c857d6f583Bb43D01a8f5B73; // jobId = "d562d13f83a947d4bb720be4a2682978"; // fee = 1 * 10 ** 18; // 1 * 10 ** 18 = 1 Link // Kovan // oracle = 0xAA1DC356dc4B18f30C347798FD5379F3D77ABC5b; // jobId = "c7dd72ca14b44f0c9b6cfcd4b7ec0a2c"; // fee = 0.1 * 10 ** 18; // 1 * 10 ** 18 = 1 Link // VRF setup. // Kovan network. // TODO: Change this to mainnet keyHash = 0xAA77729D3466CA35AE8D28B3BBAC7CC36A5031EFDC430821C02BC31A238AF445; vrfFee = 2 * 10 ** 18; // 1 * 10 ** 18 = 1 Link } /** * Payout */ function withdraw() external onlyOwner { address payable payableOwner = payable(owner()); payableOwner.transfer(address(this).balance); } function withdrawLink() external onlyOwner { LinkTokenInterface link = LinkTokenInterface(chainlinkTokenAddress()); address payable payableOwner = payable(owner()); link.transfer(payableOwner, link.balanceOf(address(this))); } /** * Pausing */ function paused() external view returns (bool) { return _paused; } function togglePaused() external onlyOwner { _paused = !_paused; } /** * Updating Oracle */ function getOracle() external view returns (address, bytes32, uint256) { return (oracle, jobId, fee); } function updateOracle(address _oracle, bytes32 _jobId, uint256 _fee) external onlyOwner { oracle = _oracle; jobId = _jobId; fee = _fee; } /** * Methods for Web3 */ function getGenerativeMinted() external view returns (uint256) { return generativeMinted.current(); } function getGenesisMinted() external view returns (uint256) { return genesisMinted.current(); } function getGenesisRandomSeed() external view returns (uint256) { return genesisRandomSeed; } /** * Generative minting */ function mintTrunk(uint256 randomSeed, bool isBasic) external payable returns (uint256 tokenId) { // Enforce tiered fees. require(msg.value >= getBaseFeeTier()); require(msg.value >= getFeeTier()); // In pause, prevent "free" mints. if (_paused) { require(msg.value >= (0.05 ether)); } // Update minted count. mintedCount[msg.sender] = (mintedCount[msg.sender] + 1); // Limit supply. require(generativeMinted.current() < generativeSupply); // 0 ..< 19,500 generativeMinted.increment(); // Start at 1 (tokens 1 ..< 19,501) // Get current token, starting after the last genesis trunk (i.e. 1,501). uint256 _tokenId = genesisSupply + generativeMinted.current(); // 1,501 ..< 21,001 // Mint token itself. _safeMint(msg.sender, _tokenId); // In order to save Link for the most basic combination (Sapling + Noon), // we skip remoteMint, since no-one would fake the most basic level. if (isBasic) { // Skip oracle step for basic trunks. // Since we aren't storing this with the oracle, set the seed as the token URI. completeMint(0x00, _tokenId, randomSeed); } else { // Generate art on remote URL. bytes32 requestId = remoteMint(randomSeed, _tokenId); // Store token to mapping for when request completes. users[requestId] = User(_tokenId, msg.sender); } // Returned so web3 can filter on it. return _tokenId; } function mintTwentyTrunks() external payable returns (uint256 tokenId) { // Enforce tiered fees. require(msg.value >= 1 ether); // Limit supply. require(generativeMinted.current() + 20 <= generativeSupply); // First token ID, one more than current. uint256 firstTokenId = genesisSupply + generativeMinted.current() + 1; for (uint8 i = 0; i < 20; i++) { // Mint token itself. generativeMinted.increment(); _safeMint(msg.sender, (genesisSupply + generativeMinted.current())); } // Generate art (x20) on remote URL. bytes32 requestId = remoteMintTwenty(firstTokenId); // Store token to mapping for when request completes. users[requestId] = User(firstTokenId, msg.sender); // Returned so web3 can filter on it. return firstTokenId; } function getFeeTier() public view returns (uint256 feeTier) { // Fee tier generated from value returned from our service. uint256 nextFeeTier = nextFeeTiers[msg.sender]; if (nextFeeTier == 0) { return 0; } else { return nextFeeTier; } } function getBaseFeeTier() public view returns (uint256 baseFeeTier) { // Fallback check to guard the base price. uint16 minted = mintedCount[msg.sender]; if (minted == 0) { return 0; } else { // Multiplier is divided by 10 at the end to avoid floating point. uint256 multiplier = 10; if (minted < 5) { multiplier = 10; } else if (minted < 20) { multiplier = 15; } else if (minted < 50) { multiplier = 20; } else if (minted < 100) { multiplier = 25; } else { multiplier = 30; } return ((0.05 ether) * multiplier) / 10; } } /** * Genesis minting */ function mintGenesisTrunk(uint256 numberToMint) external payable returns (uint256[] memory tokenIds) { // Minting constraints. require(numberToMint >= 1); require(numberToMint <= 20); require(numberToMint <= (genesisSupply - genesisMinted.current())); // Ensure we collect enough eth! require(msg.value >= (0.5 ether) * numberToMint); // Loop minting. uint256[] memory _tokenIds = new uint256[](numberToMint); for (uint256 i = 0; i < numberToMint; i++) { uint256 tokenId = mintGenesisTrunk(); _tokenIds[i] = tokenId; } return _tokenIds; } function mintGenesisTrunk() private returns (uint256 tokenId) { // Limit supply. require(genesisMinted.current() < genesisSupply); // 0 ..< 1,500 genesisMinted.increment(); // Start at 1 (tokens 1 ..< 1,501) // Check we seeded the genesis random seed. require(genesisRandomSeed != 0); // Get current token. // Turns 1 ..< 1,501 into a random (but unminted) number in that range. uint256 _tokenId = getRandomGenesisTrunk(genesisMinted.current()); // Mint token itself. _safeMint(msg.sender, _tokenId); // Returned so web3 can filter on it. return _tokenId; } // Required to be called before first mint to populate genesisRandomSeed. function fetchGenesisSeedFromVRF() external onlyOwner { getRandomNumber(); } // "Shuffles" our list, from random seed, without using much storage, starting at 1. // This works because (a x + b) modulo n visits all integers in 0..<n exactly once // as x iterates through the integers in 0..<n, so long as a is coprime with n. function getRandomGenesisTrunk(uint256 index) private view returns (uint256) { return (((index * genesisPrime) + genesisRandomSeed) % genesisSupply) + 1; } // Updates function setBaseURI(string calldata baseURI_) external onlyOwner { // Allows us to update the baseURI after deploy, so we can move to IPFS if we choose to. _setBaseURI(baseURI_); } /** * Chainlink fetch */ // Regular function remoteMint(uint256 randomSeed, uint256 tokenId) private returns (bytes32 requestId) { // Make the Chainlink request. Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector); string memory url = string( abi.encodePacked( "https://service.cryptotrunks.co/mint?address=", toString(msg.sender), "&seed=", randomSeed.toString(), "&token=", tokenId.toString() ) ); request.add("get", url); request.add("path", "result"); // jsonpath.com return sendChainlinkRequestTo(oracle, request, fee); } function fulfill(bytes32 _requestId, uint256 _resultId) public recordChainlinkFulfillment(_requestId) { require(_resultId > 0); // Retrieve user from mapping. User memory user = users[_requestId]; require(user.addr != address(0)); // _resultId is made up of returned token id + next minting fee. // e.g. if token = 1234 and fee = 0.15 ether, oracle returns 1234150. // Inlined below to save space. // uint256 returnedFeeTier = _resultId % 1000; // Get last digits. // uint256 returnedTokenId = _resultId / 1000; // Get other digits. // Store tree age for future mints. nextFeeTiers[user.addr] = ((_resultId % 1000) * 1 ether) / 1000; completeMint(_requestId, user.tokenId, (_resultId / 1000)); } function completeMint(bytes32 _requestId, uint256 _tokenId, uint256 _returnedTokenId) private { // Update our token URI in case it changed. _setTokenURI(_tokenId, _returnedTokenId.toString()); // Emit event for Web3. emit RemoteMintFulfilled(_requestId, _tokenId, _returnedTokenId); } // Minting 20 ("Gamble") function remoteMintTwenty(uint256 tokenId) private returns (bytes32 requestId) { // Make the Chainlink request. Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfillTwenty.selector); string memory url = string( abi.encodePacked( "https://service.cryptotrunks.co/mint_twenty?address=", toString(msg.sender), "&token=", tokenId.toString() ) ); request.add("get", url); request.add("path", "result"); // jsonpath.com return sendChainlinkRequestTo(oracle, request, fee); } function fulfillTwenty(bytes32 _requestId, uint256 _resultId) public recordChainlinkFulfillment(_requestId) { require(_resultId > 0); // Retrieve user from mapping. User memory user = users[_requestId]; require(user.addr != address(0)); // Gambling doesn't affect fee tier. // Since we can't afford the gas, the service will assume token ID is the baseURI, // i.e. we're not going make 20 _setTokenURI() calls here. // Emit event for Web3. emit RemoteMintTwentyFulfilled(_requestId, user.tokenId, _resultId); } /** * Chainlink VRF */ function getRandomNumber() private returns (bytes32 requestId) { // Only permit if this has never been run. require(genesisRandomSeed == 0); return requestRandomness(keyHash, vrfFee, block.number); } function fulfillRandomness(bytes32 /* requestId */, uint256 randomness) internal override { genesisRandomSeed = randomness; } /** * Utils */ function toString(address account) private pure returns (string memory) { return toString(abi.encodePacked(account)); } // https://ethereum.stackexchange.com/a/58341/68257 function toString(bytes memory data) private pure returns (string memory) { bytes memory alphabet = "0123456789abcdef"; bytes memory str = new bytes(2 + data.length * 2); str[0] = "0"; str[1] = "x"; for (uint i = 0; i < data.length; i++) { str[2+i*2] = alphabet[uint(uint8(data[i] >> 4))]; str[3+i*2] = alphabet[uint(uint8(data[i] & 0x0f))]; } return string(str); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../../utils/Context.sol"; import "./IERC721.sol"; import "./IERC721Metadata.sol"; import "./IERC721Enumerable.sol"; import "./IERC721Receiver.sol"; import "../../introspection/ERC165.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; import "../../utils/EnumerableSet.sol"; import "../../utils/EnumerableMap.sol"; import "../../utils/Strings.sol"; /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://eips.ethereum.org/EIPS/eip-721 */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable { using SafeMath for uint256; using Address for address; using EnumerableSet for EnumerableSet.UintSet; using EnumerableMap for EnumerableMap.UintToAddressMap; using Strings for uint256; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; // Mapping from holder address to their (enumerable) set of owned tokens mapping (address => EnumerableSet.UintSet) private _holderTokens; // Enumerable mapping from token ids to their owners EnumerableMap.UintToAddressMap private _tokenOwners; // 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; // Token name string private _name; // Token symbol string private _symbol; // Optional mapping for token URIs mapping (uint256 => string) private _tokenURIs; // Base URI string private _baseURI; /* * bytes4(keccak256('balanceOf(address)')) == 0x70a08231 * bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e * bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3 * bytes4(keccak256('getApproved(uint256)')) == 0x081812fc * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5 * bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde * * => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^ * 0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd */ bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd; /* * bytes4(keccak256('name()')) == 0x06fdde03 * bytes4(keccak256('symbol()')) == 0x95d89b41 * bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd * * => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f */ bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f; /* * bytes4(keccak256('totalSupply()')) == 0x18160ddd * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59 * bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7 * * => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63 */ bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor (string memory name_, string memory symbol_) public { _name = name_; _symbol = symbol_; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721); _registerInterface(_INTERFACE_ID_ERC721_METADATA); _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _holderTokens[owner].length(); } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token"); } /** * @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) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory _tokenURI = _tokenURIs[tokenId]; string memory base = baseURI(); // If there is no base URI, return the token URI. if (bytes(base).length == 0) { return _tokenURI; } // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked). if (bytes(_tokenURI).length > 0) { return string(abi.encodePacked(base, _tokenURI)); } // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI. return string(abi.encodePacked(base, tokenId.toString())); } /** * @dev Returns the base URI set via {_setBaseURI}. This will be * automatically added as a prefix in {tokenURI} to each token's URI, or * to the token ID if no specific URI is set for that token ID. */ function baseURI() public view virtual returns (string memory) { return _baseURI; } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { return _holderTokens[owner].at(index); } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds return _tokenOwners.length(); } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { (uint256 tokenId, ) = _tokenOwners.at(index); return tokenId; } /** * @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 || ERC721.isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_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: transfer caller is not owner nor 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: transfer caller is not owner nor 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 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 _tokenOwners.contains(tokenId); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: d* * - `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); _holderTokens[to].add(tokenId); _tokenOwners.set(tokenId, to); emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); // internal owner _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); // Clear metadata (if any) if (bytes(_tokenURIs[tokenId]).length != 0) { delete _tokenURIs[tokenId]; } _holderTokens[owner].remove(tokenId); _tokenOwners.remove(tokenId); emit Transfer(owner, address(0), tokenId); } /** * @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 of token that is not own"); // internal owner require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _holderTokens[from].remove(tokenId); _holderTokens[to].add(tokenId); _tokenOwners.set(tokenId, to); emit Transfer(from, to, tokenId); } /** * @dev Sets `_tokenURI` as the tokenURI of `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual { require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token"); _tokenURIs[tokenId] = _tokenURI; } /** * @dev Internal function to set the base URI for all token IDs. It is * automatically added as a prefix to the value returned in {tokenURI}, * or to the token ID if {tokenURI} is empty. */ function _setBaseURI(string memory baseURI_) internal virtual { _baseURI = baseURI_; } /** * @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()) { return true; } bytes memory returndata = to.functionCall(abi.encodeWithSelector( IERC721Receiver(to).onERC721Received.selector, _msgSender(), from, tokenId, _data ), "ERC721: transfer to non ERC721Receiver implementer"); bytes4 retval = abi.decode(returndata, (bytes4)); return (retval == _ERC721_RECEIVED); } /** * @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); // internal owner } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { 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 { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../math/SafeMath.sol"; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath} * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never * directly accessed. */ library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./Chainlink.sol"; import "./interfaces/ENSInterface.sol"; import "./interfaces/LinkTokenInterface.sol"; import "./interfaces/ChainlinkRequestInterface.sol"; import "./interfaces/PointerInterface.sol"; import { ENSResolver as ENSResolver_Chainlink } from "./vendor/ENSResolver.sol"; /** * @title The ChainlinkClient contract * @notice Contract writers can inherit this contract in order to create requests for the * Chainlink network */ contract ChainlinkClient { using Chainlink for Chainlink.Request; uint256 constant internal LINK = 10**18; uint256 constant private AMOUNT_OVERRIDE = 0; address constant private SENDER_OVERRIDE = address(0); uint256 constant private ARGS_VERSION = 1; bytes32 constant private ENS_TOKEN_SUBNAME = keccak256("link"); bytes32 constant private ENS_ORACLE_SUBNAME = keccak256("oracle"); address constant private LINK_TOKEN_POINTER = 0xC89bD4E1632D3A43CB03AAAd5262cbe4038Bc571; ENSInterface private ens; bytes32 private ensNode; LinkTokenInterface private link; ChainlinkRequestInterface private oracle; uint256 private requestCount = 1; mapping(bytes32 => address) private pendingRequests; event ChainlinkRequested(bytes32 indexed id); event ChainlinkFulfilled(bytes32 indexed id); event ChainlinkCancelled(bytes32 indexed id); /** * @notice Creates a request that can hold additional parameters * @param _specId The Job Specification ID that the request will be created for * @param _callbackAddress The callback address that the response will be sent to * @param _callbackFunctionSignature The callback function signature to use for the callback address * @return A Chainlink Request struct in memory */ function buildChainlinkRequest( bytes32 _specId, address _callbackAddress, bytes4 _callbackFunctionSignature ) internal pure returns (Chainlink.Request memory) { Chainlink.Request memory req; return req.initialize(_specId, _callbackAddress, _callbackFunctionSignature); } /** * @notice Creates a Chainlink request to the stored oracle address * @dev Calls `chainlinkRequestTo` with the stored oracle address * @param _req The initialized Chainlink Request * @param _payment The amount of LINK to send for the request * @return requestId The request ID */ function sendChainlinkRequest(Chainlink.Request memory _req, uint256 _payment) internal returns (bytes32) { return sendChainlinkRequestTo(address(oracle), _req, _payment); } /** * @notice Creates a Chainlink request to the specified oracle address * @dev Generates and stores a request ID, increments the local nonce, and uses `transferAndCall` to * send LINK which creates a request on the target oracle contract. * Emits ChainlinkRequested event. * @param _oracle The address of the oracle for the request * @param _req The initialized Chainlink Request * @param _payment The amount of LINK to send for the request * @return requestId The request ID */ function sendChainlinkRequestTo(address _oracle, Chainlink.Request memory _req, uint256 _payment) internal returns (bytes32 requestId) { requestId = keccak256(abi.encodePacked(this, requestCount)); _req.nonce = requestCount; pendingRequests[requestId] = _oracle; emit ChainlinkRequested(requestId); require(link.transferAndCall(_oracle, _payment, encodeRequest(_req)), "unable to transferAndCall to oracle"); requestCount += 1; return requestId; } /** * @notice Allows a request to be cancelled if it has not been fulfilled * @dev Requires keeping track of the expiration value emitted from the oracle contract. * Deletes the request from the `pendingRequests` mapping. * Emits ChainlinkCancelled event. * @param _requestId The request ID * @param _payment The amount of LINK sent for the request * @param _callbackFunc The callback function specified for the request * @param _expiration The time of the expiration for the request */ function cancelChainlinkRequest( bytes32 _requestId, uint256 _payment, bytes4 _callbackFunc, uint256 _expiration ) internal { ChainlinkRequestInterface requested = ChainlinkRequestInterface(pendingRequests[_requestId]); delete pendingRequests[_requestId]; emit ChainlinkCancelled(_requestId); requested.cancelOracleRequest(_requestId, _payment, _callbackFunc, _expiration); } /** * @notice Sets the stored oracle address * @param _oracle The address of the oracle contract */ function setChainlinkOracle(address _oracle) internal { oracle = ChainlinkRequestInterface(_oracle); } /** * @notice Sets the LINK token address * @param _link The address of the LINK token contract */ function setChainlinkToken(address _link) internal { link = LinkTokenInterface(_link); } /** * @notice Sets the Chainlink token address for the public * network as given by the Pointer contract */ function setPublicChainlinkToken() internal { setChainlinkToken(PointerInterface(LINK_TOKEN_POINTER).getAddress()); } /** * @notice Retrieves the stored address of the LINK token * @return The address of the LINK token */ function chainlinkTokenAddress() internal view returns (address) { return address(link); } /** * @notice Retrieves the stored address of the oracle contract * @return The address of the oracle contract */ function chainlinkOracleAddress() internal view returns (address) { return address(oracle); } /** * @notice Allows for a request which was created on another contract to be fulfilled * on this contract * @param _oracle The address of the oracle contract that will fulfill the request * @param _requestId The request ID used for the response */ function addChainlinkExternalRequest(address _oracle, bytes32 _requestId) internal notPendingRequest(_requestId) { pendingRequests[_requestId] = _oracle; } /** * @notice Sets the stored oracle and LINK token contracts with the addresses resolved by ENS * @dev Accounts for subnodes having different resolvers * @param _ens The address of the ENS contract * @param _node The ENS node hash */ function useChainlinkWithENS(address _ens, bytes32 _node) internal { ens = ENSInterface(_ens); ensNode = _node; bytes32 linkSubnode = keccak256(abi.encodePacked(ensNode, ENS_TOKEN_SUBNAME)); ENSResolver_Chainlink resolver = ENSResolver_Chainlink(ens.resolver(linkSubnode)); setChainlinkToken(resolver.addr(linkSubnode)); updateChainlinkOracleWithENS(); } /** * @notice Sets the stored oracle contract with the address resolved by ENS * @dev This may be called on its own as long as `useChainlinkWithENS` has been called previously */ function updateChainlinkOracleWithENS() internal { bytes32 oracleSubnode = keccak256(abi.encodePacked(ensNode, ENS_ORACLE_SUBNAME)); ENSResolver_Chainlink resolver = ENSResolver_Chainlink(ens.resolver(oracleSubnode)); setChainlinkOracle(resolver.addr(oracleSubnode)); } /** * @notice Encodes the request to be sent to the oracle contract * @dev The Chainlink node expects values to be in order for the request to be picked up. Order of types * will be validated in the oracle contract. * @param _req The initialized Chainlink Request * @return The bytes payload for the `transferAndCall` method */ function encodeRequest(Chainlink.Request memory _req) private view returns (bytes memory) { return abi.encodeWithSelector( oracle.oracleRequest.selector, SENDER_OVERRIDE, // Sender value - overridden by onTokenTransfer by the requesting contract's address AMOUNT_OVERRIDE, // Amount value - overridden by onTokenTransfer by the actual amount of LINK sent _req.id, _req.callbackAddress, _req.callbackFunctionId, _req.nonce, ARGS_VERSION, _req.buf.buf); } /** * @notice Ensures that the fulfillment is valid for this contract * @dev Use if the contract developer prefers methods instead of modifiers for validation * @param _requestId The request ID for fulfillment */ function validateChainlinkCallback(bytes32 _requestId) internal recordChainlinkFulfillment(_requestId) // solhint-disable-next-line no-empty-blocks {} /** * @dev Reverts if the sender is not the oracle of the request. * Emits ChainlinkFulfilled event. * @param _requestId The request ID for fulfillment */ modifier recordChainlinkFulfillment(bytes32 _requestId) { require(msg.sender == pendingRequests[_requestId], "Source must be the oracle of the request"); delete pendingRequests[_requestId]; emit ChainlinkFulfilled(_requestId); _; } /** * @dev Reverts if the request is already pending * @param _requestId The request ID for fulfillment */ modifier notPendingRequest(bytes32 _requestId) { require(pendingRequests[_requestId] == address(0), "Request is already pending"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "@chainlink/contracts/v0.6/vendor/SafeMathChainlink.sol"; import "@chainlink/contracts/v0.6/interfaces/LinkTokenInterface.sol"; import "@chainlink/contracts/v0.6/VRFRequestIDBase.sol"; // import "./vendor/SafeMathChainlink.sol"; // import "./interfaces/LinkTokenInterface.sol"; // import "./VRFRequestIDBase.sol"; /** **************************************************************************** * @notice Interface for contracts using VRF randomness * ***************************************************************************** * @dev PURPOSE * * @dev Reggie the Random Oracle (not his real job) wants to provide randomness * @dev to Vera the verifier in such a way that Vera can be sure he's not * @dev making his output up to suit himself. Reggie provides Vera a public key * @dev to which he knows the secret key. Each time Vera provides a seed to * @dev Reggie, he gives back a value which is computed completely * @dev deterministically from the seed and the secret key. * * @dev Reggie provides a proof by which Vera can verify that the output was * @dev correctly computed once Reggie tells it to her, but without that proof, * @dev the output is indistinguishable to her from a uniform random sample * @dev from the output space. * * @dev The purpose of this contract is to make it easy for unrelated contracts * @dev to talk to Vera the verifier about the work Reggie is doing, to provide * @dev simple access to a verifiable source of randomness. * ***************************************************************************** * @dev USAGE * * @dev Calling contracts must inherit from VRFConsumerBase, and can * @dev initialize VRFConsumerBase's attributes in their constructor as * @dev shown: * * @dev contract VRFConsumer { * @dev constuctor(<other arguments>, address _vrfCoordinator, address _link) * @dev VRFConsumerBase(_vrfCoordinator, _link) public { * @dev <initialization with other arguments goes here> * @dev } * @dev } * * @dev The oracle will have given you an ID for the VRF keypair they have * @dev committed to (let's call it keyHash), and have told you the minimum LINK * @dev price for VRF service. Make sure your contract has sufficient LINK, and * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you * @dev want to generate randomness from. * * @dev Once the VRFCoordinator has received and validated the oracle's response * @dev to your request, it will call your contract's fulfillRandomness method. * * @dev The randomness argument to fulfillRandomness is the actual random value * @dev generated from your seed. * * @dev The requestId argument is generated from the keyHash and the seed by * @dev makeRequestId(keyHash, seed). If your contract could have concurrent * @dev requests open, you can use the requestId to track which seed is * @dev associated with which randomness. See VRFRequestIDBase.sol for more * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind, * @dev if your contract could have multiple requests in flight simultaneously.) * * @dev Colliding `requestId`s are cryptographically impossible as long as seeds * @dev differ. (Which is critical to making unpredictable randomness! See the * @dev next section.) * * ***************************************************************************** * @dev SECURITY CONSIDERATIONS * * @dev A method with the ability to call your fulfillRandomness method directly * @dev could spoof a VRF response with any random value, so it's critical that * @dev it cannot be directly called by anything other than this base contract * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method). * * @dev For your users to trust that your contract's random behavior is free * @dev from malicious interference, it's best if you can write it so that all * @dev behaviors implied by a VRF response are executed *during* your * @dev fulfillRandomness method. If your contract must store the response (or * @dev anything derived from it) and use it later, you must ensure that any * @dev user-significant behavior which depends on that stored value cannot be * @dev manipulated by a subsequent VRF request. * * @dev Similarly, both miners and the VRF oracle itself have some influence * @dev over the order in which VRF responses appear on the blockchain, so if * @dev your contract could have multiple VRF requests in flight simultaneously, * @dev you must ensure that the order in which the VRF responses arrive cannot * @dev be used to manipulate your contract's user-significant behavior. * * @dev Since the ultimate input to the VRF is mixed with the block hash of the * @dev block in which the request is made, user-provided seeds have no impact * @dev on its economic security properties. They are only included for API * @dev compatability with previous versions of this contract. * * @dev Since the block hash of the block which contains the requestRandomness * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful * @dev miner could, in principle, fork the blockchain to evict the block * @dev containing the request, forcing the request to be included in a * @dev different block with a different hash, and therefore a different input * @dev to the VRF. However, such an attack would incur a substantial economic * @dev cost. This cost scales with the number of blocks the VRF oracle waits * @dev until it calls responds to a request. */ abstract contract VRFConsumerBase is VRFRequestIDBase { using SafeMathChainlink for uint256; /** * @notice fulfillRandomness handles the VRF response. Your contract must * @notice implement it. See "SECURITY CONSIDERATIONS" above for important * @notice principles to keep in mind when implementing your fulfillRandomness * @notice method. * * @dev VRFConsumerBase expects its subcontracts to have a method with this * @dev signature, and will call it once it has verified the proof * @dev associated with the randomness. (It is triggered via a call to * @dev rawFulfillRandomness, below.) * * @param requestId The Id initially returned by requestRandomness * @param randomness the VRF output */ function fulfillRandomness(bytes32 requestId, uint256 randomness) internal virtual; /** * @notice requestRandomness initiates a request for VRF output given _seed * * @dev The fulfillRandomness method receives the output, once it's provided * @dev by the Oracle, and verified by the vrfCoordinator. * * @dev The _keyHash must already be registered with the VRFCoordinator, and * @dev the _fee must exceed the fee specified during registration of the * @dev _keyHash. * * @dev The _seed parameter is vestigial, and is kept only for API * @dev compatibility with older versions. It can't *hurt* to mix in some of * @dev your own randomness, here, but it's not necessary because the VRF * @dev oracle will mix the hash of the block containing your request into the * @dev VRF seed it ultimately uses. * * @param _keyHash ID of public key against which randomness is generated * @param _fee The amount of LINK to send with the request * @param _seed seed mixed into the input of the VRF. * * @return requestId unique ID for this request * * @dev The returned requestId can be used to distinguish responses to * @dev concurrent requests. It is passed as the first argument to * @dev fulfillRandomness. */ function requestRandomness(bytes32 _keyHash, uint256 _fee, uint256 _seed) internal returns (bytes32 requestId) { LINK_TOKEN_INTERFACE.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, _seed)); // This is the seed passed to VRFCoordinator. The oracle will mix this with // the hash of the block containing this request to obtain the seed/input // which is finally passed to the VRF cryptographic machinery. uint256 vRFSeed = makeVRFInputSeed(_keyHash, _seed, address(this), nonces[_keyHash]); // nonces[_keyHash] must stay in sync with // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above // successful LINK_TOKEN_INTERFACE.transferAndCall (in VRFCoordinator.randomnessRequest). // This provides protection against the user repeating their input seed, // which would result in a predictable/duplicate output, if multiple such // requests appeared in the same block. nonces[_keyHash] = nonces[_keyHash].add(1); return makeRequestId(_keyHash, vRFSeed); } LinkTokenInterface immutable internal LINK_TOKEN_INTERFACE; address immutable private vrfCoordinator; // Nonces for each VRF key from which randomness has been requested. // // Must stay in sync with VRFCoordinator[_keyHash][this] mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces; /** * @param _vrfCoordinator address of VRFCoordinator contract * @param _link address of LINK token contract * * @dev https://docs.chain.link/docs/link-token-contracts */ constructor(address _vrfCoordinator, address _link) public { vrfCoordinator = _vrfCoordinator; LINK_TOKEN_INTERFACE = LinkTokenInterface(_link); } // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF // proof. rawFulfillRandomness then calls fulfillRandomness, after validating // the origin of the call function rawFulfillRandomness(bytes32 requestId, uint256 randomness) external { require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill"); fulfillRandomness(requestId, randomness); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; import "../../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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * 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 Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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 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); /** * @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; }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <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 pragma solidity >=0.6.2 <0.8.0; import "./IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 `IERC721.onERC721Received.selector`. */ function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts may inherit from this and call {_registerInterface} to declare * their support of an interface. */ abstract contract ERC165 is IERC165 { /* * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 */ bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * @dev Mapping of interface ids to whether or not it's supported. */ mapping(bytes4 => bool) private _supportedInterfaces; constructor () internal { // Derived contracts need only register support for their own interfaces, // we register support for ERC165 itself here _registerInterface(_INTERFACE_ID_ERC165); } /** * @dev See {IERC165-supportsInterface}. * * Time complexity O(1), guaranteed to always use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return _supportedInterfaces[interfaceId]; } /** * @dev Registers the contract as an implementer of the interface defined by * `interfaceId`. Support of the actual ERC165 interface is automatic and * registering its interface id is not required. * * See {IERC165-supportsInterface}. * * Requirements: * * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). */ function _registerInterface(bytes4 interfaceId) internal virtual { require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); _supportedInterfaces[interfaceId] = true; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Library for managing an enumerable variant of Solidity's * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`] * type. * * Maps have the following properties: * * - Entries are added, removed, and checked for existence in constant time * (O(1)). * - Entries are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableMap for EnumerableMap.UintToAddressMap; * * // Declare a set state variable * EnumerableMap.UintToAddressMap private myMap; * } * ``` * * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are * supported. */ library EnumerableMap { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Map type with // bytes32 keys and values. // The Map implementation uses private functions, and user-facing // implementations (such as Uint256ToAddressMap) are just wrappers around // the underlying Map. // This means that we can only create new EnumerableMaps for types that fit // in bytes32. struct MapEntry { bytes32 _key; bytes32 _value; } struct Map { // Storage of map keys and values MapEntry[] _entries; // Position of the entry defined by a key in the `entries` array, plus 1 // because index 0 means a key is not in the map. mapping (bytes32 => uint256) _indexes; } /** * @dev Adds a key-value pair to a map, or updates the value for an existing * key. O(1). * * Returns true if the key was added to the map, that is if it was not * already present. */ function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) { // We read and store the key's index to prevent multiple reads from the same storage slot uint256 keyIndex = map._indexes[key]; if (keyIndex == 0) { // Equivalent to !contains(map, key) map._entries.push(MapEntry({ _key: key, _value: value })); // The entry is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value map._indexes[key] = map._entries.length; return true; } else { map._entries[keyIndex - 1]._value = value; return false; } } /** * @dev Removes a key-value pair from a map. O(1). * * Returns true if the key was removed from the map, that is if it was present. */ function _remove(Map storage map, bytes32 key) private returns (bool) { // We read and store the key's index to prevent multiple reads from the same storage slot uint256 keyIndex = map._indexes[key]; if (keyIndex != 0) { // Equivalent to contains(map, key) // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one // in the array, and then remove the last entry (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = keyIndex - 1; uint256 lastIndex = map._entries.length - 1; // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. MapEntry storage lastEntry = map._entries[lastIndex]; // Move the last entry to the index where the entry to delete is map._entries[toDeleteIndex] = lastEntry; // Update the index for the moved entry map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved entry was stored map._entries.pop(); // Delete the index for the deleted slot delete map._indexes[key]; return true; } else { return false; } } /** * @dev Returns true if the key is in the map. O(1). */ function _contains(Map storage map, bytes32 key) private view returns (bool) { return map._indexes[key] != 0; } /** * @dev Returns the number of key-value pairs in the map. O(1). */ function _length(Map storage map) private view returns (uint256) { return map._entries.length; } /** * @dev Returns the key-value pair stored at position `index` in the map. O(1). * * Note that there are no guarantees on the ordering of entries inside the * array, and it may change when more entries are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) { require(map._entries.length > index, "EnumerableMap: index out of bounds"); MapEntry storage entry = map._entries[index]; return (entry._key, entry._value); } /** * @dev Tries to returns the value associated with `key`. O(1). * Does not revert if `key` is not in the map. */ function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) { uint256 keyIndex = map._indexes[key]; if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key) return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based } /** * @dev Returns the value associated with `key`. O(1). * * Requirements: * * - `key` must be in the map. */ function _get(Map storage map, bytes32 key) private view returns (bytes32) { uint256 keyIndex = map._indexes[key]; require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key) return map._entries[keyIndex - 1]._value; // All indexes are 1-based } /** * @dev Same as {_get}, with a custom error message when `key` is not in the map. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {_tryGet}. */ function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) { uint256 keyIndex = map._indexes[key]; require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key) return map._entries[keyIndex - 1]._value; // All indexes are 1-based } // UintToAddressMap struct UintToAddressMap { Map _inner; } /** * @dev Adds a key-value pair to a map, or updates the value for an existing * key. O(1). * * Returns true if the key was added to the map, that is if it was not * already present. */ function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) { return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the key was removed from the map, that is if it was present. */ function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) { return _remove(map._inner, bytes32(key)); } /** * @dev Returns true if the key is in the map. O(1). */ function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) { return _contains(map._inner, bytes32(key)); } /** * @dev Returns the number of elements in the map. O(1). */ function length(UintToAddressMap storage map) internal view returns (uint256) { return _length(map._inner); } /** * @dev Returns the element stored at position `index` in the set. O(1). * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) { (bytes32 key, bytes32 value) = _at(map._inner, index); return (uint256(key), address(uint160(uint256(value)))); } /** * @dev Tries to returns the value associated with `key`. O(1). * Does not revert if `key` is not in the map. * * _Available since v3.4._ */ function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) { (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key)); return (success, address(uint160(uint256(value)))); } /** * @dev Returns the value associated with `key`. O(1). * * Requirements: * * - `key` must be in the map. */ function get(UintToAddressMap storage map, uint256 key) internal view returns (address) { return address(uint160(uint256(_get(map._inner, bytes32(key))))); } /** * @dev Same as {get}, with a custom error message when `key` is not in the map. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryGet}. */ function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) { return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage)))); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev String operations. */ library Strings { /** * @dev Converts a `uint256` to its ASCII `string` representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); uint256 index = digits - 1; temp = value; while (temp != 0) { buffer[index--] = bytes1(uint8(48 + temp % 10)); temp /= 10; } return string(buffer); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 pragma solidity ^0.6.0; import { CBORChainlink } from "./vendor/CBORChainlink.sol"; import { BufferChainlink } from "./vendor/BufferChainlink.sol"; /** * @title Library for common Chainlink functions * @dev Uses imported CBOR library for encoding to buffer */ library Chainlink { uint256 internal constant defaultBufferSize = 256; // solhint-disable-line const-name-snakecase using CBORChainlink for BufferChainlink.buffer; struct Request { bytes32 id; address callbackAddress; bytes4 callbackFunctionId; uint256 nonce; BufferChainlink.buffer buf; } /** * @notice Initializes a Chainlink request * @dev Sets the ID, callback address, and callback function signature on the request * @param self The uninitialized request * @param _id The Job Specification ID * @param _callbackAddress The callback address * @param _callbackFunction The callback function signature * @return The initialized request */ function initialize( Request memory self, bytes32 _id, address _callbackAddress, bytes4 _callbackFunction ) internal pure returns (Chainlink.Request memory) { BufferChainlink.init(self.buf, defaultBufferSize); self.id = _id; self.callbackAddress = _callbackAddress; self.callbackFunctionId = _callbackFunction; return self; } /** * @notice Sets the data for the buffer without encoding CBOR on-chain * @dev CBOR can be closed with curly-brackets {} or they can be left off * @param self The initialized request * @param _data The CBOR data */ function setBuffer(Request memory self, bytes memory _data) internal pure { BufferChainlink.init(self.buf, _data.length); BufferChainlink.append(self.buf, _data); } /** * @notice Adds a string value to the request with a given key name * @param self The initialized request * @param _key The name of the key * @param _value The string value to add */ function add(Request memory self, string memory _key, string memory _value) internal pure { self.buf.encodeString(_key); self.buf.encodeString(_value); } /** * @notice Adds a bytes value to the request with a given key name * @param self The initialized request * @param _key The name of the key * @param _value The bytes value to add */ function addBytes(Request memory self, string memory _key, bytes memory _value) internal pure { self.buf.encodeString(_key); self.buf.encodeBytes(_value); } /** * @notice Adds a int256 value to the request with a given key name * @param self The initialized request * @param _key The name of the key * @param _value The int256 value to add */ function addInt(Request memory self, string memory _key, int256 _value) internal pure { self.buf.encodeString(_key); self.buf.encodeInt(_value); } /** * @notice Adds a uint256 value to the request with a given key name * @param self The initialized request * @param _key The name of the key * @param _value The uint256 value to add */ function addUint(Request memory self, string memory _key, uint256 _value) internal pure { self.buf.encodeString(_key); self.buf.encodeUInt(_value); } /** * @notice Adds an array of strings to the request with a given key name * @param self The initialized request * @param _key The name of the key * @param _values The array of string values to add */ function addStringArray(Request memory self, string memory _key, string[] memory _values) internal pure { self.buf.encodeString(_key); self.buf.startArray(); for (uint256 i = 0; i < _values.length; i++) { self.buf.encodeString(_values[i]); } self.buf.endSequence(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; interface ENSInterface { // Logged when the owner of a node assigns a new owner to a subnode. event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner); // Logged when the owner of a node transfers ownership to a new account. event Transfer(bytes32 indexed node, address owner); // Logged when the resolver for a node changes. event NewResolver(bytes32 indexed node, address resolver); // Logged when the TTL of a node changes event NewTTL(bytes32 indexed node, uint64 ttl); function setSubnodeOwner(bytes32 node, bytes32 label, address _owner) external; function setResolver(bytes32 node, address _resolver) external; function setOwner(bytes32 node, address _owner) external; function setTTL(bytes32 node, uint64 _ttl) external; function owner(bytes32 node) external view returns (address); function resolver(bytes32 node) external view returns (address); function ttl(bytes32 node) external view returns (uint64); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; interface LinkTokenInterface { function allowance(address owner, address spender) external view returns (uint256 remaining); function approve(address spender, uint256 value) external returns (bool success); function balanceOf(address owner) external view returns (uint256 balance); function decimals() external view returns (uint8 decimalPlaces); function decreaseApproval(address spender, uint256 addedValue) external returns (bool success); function increaseApproval(address spender, uint256 subtractedValue) external; function name() external view returns (string memory tokenName); function symbol() external view returns (string memory tokenSymbol); function totalSupply() external view returns (uint256 totalTokensIssued); function transfer(address to, uint256 value) external returns (bool success); function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool success); function transferFrom(address from, address to, uint256 value) external returns (bool success); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; interface ChainlinkRequestInterface { function oracleRequest( address sender, uint256 requestPrice, bytes32 serviceAgreementID, address callbackAddress, bytes4 callbackFunctionId, uint256 nonce, uint256 dataVersion, bytes calldata data ) external; function cancelOracleRequest( bytes32 requestId, uint256 payment, bytes4 callbackFunctionId, uint256 expiration ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; interface PointerInterface { function getAddress() external view returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; abstract contract ENSResolver { function addr(bytes32 node) public view virtual returns (address); }
// SPDX-License-Identifier: MIT pragma solidity >= 0.4.19 < 0.7.0; import { BufferChainlink } from "./BufferChainlink.sol"; library CBORChainlink { using BufferChainlink for BufferChainlink.buffer; uint8 private constant MAJOR_TYPE_INT = 0; uint8 private constant MAJOR_TYPE_NEGATIVE_INT = 1; uint8 private constant MAJOR_TYPE_BYTES = 2; uint8 private constant MAJOR_TYPE_STRING = 3; uint8 private constant MAJOR_TYPE_ARRAY = 4; uint8 private constant MAJOR_TYPE_MAP = 5; uint8 private constant MAJOR_TYPE_TAG = 6; uint8 private constant MAJOR_TYPE_CONTENT_FREE = 7; uint8 private constant TAG_TYPE_BIGNUM = 2; uint8 private constant TAG_TYPE_NEGATIVE_BIGNUM = 3; function encodeType(BufferChainlink.buffer memory buf, uint8 major, uint value) private pure { if(value <= 23) { buf.appendUint8(uint8((major << 5) | value)); } else if(value <= 0xFF) { buf.appendUint8(uint8((major << 5) | 24)); buf.appendInt(value, 1); } else if(value <= 0xFFFF) { buf.appendUint8(uint8((major << 5) | 25)); buf.appendInt(value, 2); } else if(value <= 0xFFFFFFFF) { buf.appendUint8(uint8((major << 5) | 26)); buf.appendInt(value, 4); } else if(value <= 0xFFFFFFFFFFFFFFFF) { buf.appendUint8(uint8((major << 5) | 27)); buf.appendInt(value, 8); } } function encodeIndefiniteLengthType(BufferChainlink.buffer memory buf, uint8 major) private pure { buf.appendUint8(uint8((major << 5) | 31)); } function encodeUInt(BufferChainlink.buffer memory buf, uint value) internal pure { encodeType(buf, MAJOR_TYPE_INT, value); } function encodeInt(BufferChainlink.buffer memory buf, int value) internal pure { if(value < -0x10000000000000000) { encodeSignedBigNum(buf, value); } else if(value > 0xFFFFFFFFFFFFFFFF) { encodeBigNum(buf, value); } else if(value >= 0) { encodeType(buf, MAJOR_TYPE_INT, uint(value)); } else { encodeType(buf, MAJOR_TYPE_NEGATIVE_INT, uint(-1 - value)); } } function encodeBytes(BufferChainlink.buffer memory buf, bytes memory value) internal pure { encodeType(buf, MAJOR_TYPE_BYTES, value.length); buf.append(value); } function encodeBigNum(BufferChainlink.buffer memory buf, int value) internal pure { buf.appendUint8(uint8((MAJOR_TYPE_TAG << 5) | TAG_TYPE_BIGNUM)); encodeBytes(buf, abi.encode(uint(value))); } function encodeSignedBigNum(BufferChainlink.buffer memory buf, int input) internal pure { buf.appendUint8(uint8((MAJOR_TYPE_TAG << 5) | TAG_TYPE_NEGATIVE_BIGNUM)); encodeBytes(buf, abi.encode(uint(-1 - input))); } function encodeString(BufferChainlink.buffer memory buf, string memory value) internal pure { encodeType(buf, MAJOR_TYPE_STRING, bytes(value).length); buf.append(bytes(value)); } function startArray(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_ARRAY); } function startMap(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_MAP); } function endSequence(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_CONTENT_FREE); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev A library for working with mutable byte buffers in Solidity. * * Byte buffers are mutable and expandable, and provide a variety of primitives * for writing to them. At any time you can fetch a bytes object containing the * current contents of the buffer. The bytes object should not be stored between * operations, as it may change due to resizing of the buffer. */ library BufferChainlink { /** * @dev Represents a mutable buffer. Buffers have a current value (buf) and * a capacity. The capacity may be longer than the current value, in * which case it can be extended without the need to allocate more memory. */ struct buffer { bytes buf; uint capacity; } /** * @dev Initializes a buffer with an initial capacity. * @param buf The buffer to initialize. * @param capacity The number of bytes of space to allocate the buffer. * @return The buffer, for chaining. */ function init(buffer memory buf, uint capacity) internal pure returns(buffer memory) { if (capacity % 32 != 0) { capacity += 32 - (capacity % 32); } // Allocate space for the buffer data buf.capacity = capacity; assembly { let ptr := mload(0x40) mstore(buf, ptr) mstore(ptr, 0) mstore(0x40, add(32, add(ptr, capacity))) } return buf; } /** * @dev Initializes a new buffer from an existing bytes object. * Changes to the buffer may mutate the original value. * @param b The bytes object to initialize the buffer with. * @return A new buffer. */ function fromBytes(bytes memory b) internal pure returns(buffer memory) { buffer memory buf; buf.buf = b; buf.capacity = b.length; return buf; } function resize(buffer memory buf, uint capacity) private pure { bytes memory oldbuf = buf.buf; init(buf, capacity); append(buf, oldbuf); } function max(uint a, uint b) private pure returns(uint) { if (a > b) { return a; } return b; } /** * @dev Sets buffer length to 0. * @param buf The buffer to truncate. * @return The original buffer, for chaining.. */ function truncate(buffer memory buf) internal pure returns (buffer memory) { assembly { let bufptr := mload(buf) mstore(bufptr, 0) } return buf; } /** * @dev Writes a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param off The start offset to write to. * @param data The data to append. * @param len The number of bytes to copy. * @return The original buffer, for chaining. */ function write(buffer memory buf, uint off, bytes memory data, uint len) internal pure returns(buffer memory) { require(len <= data.length); if (off + len > buf.capacity) { resize(buf, max(buf.capacity, len + off) * 2); } uint dest; uint src; assembly { // Memory address of the buffer data let bufptr := mload(buf) // Length of existing buffer data let buflen := mload(bufptr) // Start address = buffer address + offset + sizeof(buffer length) dest := add(add(bufptr, 32), off) // Update buffer length if we're extending it if gt(add(len, off), buflen) { mstore(bufptr, add(len, off)) } src := add(data, 32) } // Copy word-length chunks while possible for (; len >= 32; len -= 32) { assembly { mstore(dest, mload(src)) } dest += 32; src += 32; } // Copy remaining bytes uint mask = 256 ** (32 - len) - 1; assembly { let srcpart := and(mload(src), not(mask)) let destpart := and(mload(dest), mask) mstore(dest, or(destpart, srcpart)) } return buf; } /** * @dev Appends a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @param len The number of bytes to copy. * @return The original buffer, for chaining. */ function append(buffer memory buf, bytes memory data, uint len) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, len); } /** * @dev Appends a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, data.length); } /** * @dev Writes a byte to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write the byte at. * @param data The data to append. * @return The original buffer, for chaining. */ function writeUint8(buffer memory buf, uint off, uint8 data) internal pure returns(buffer memory) { if (off >= buf.capacity) { resize(buf, buf.capacity * 2); } assembly { // Memory address of the buffer data let bufptr := mload(buf) // Length of existing buffer data let buflen := mload(bufptr) // Address = buffer address + sizeof(buffer length) + off let dest := add(add(bufptr, off), 32) mstore8(dest, data) // Update buffer length if we extended it if eq(off, buflen) { mstore(bufptr, add(buflen, 1)) } } return buf; } /** * @dev Appends a byte to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function appendUint8(buffer memory buf, uint8 data) internal pure returns(buffer memory) { return writeUint8(buf, buf.buf.length, data); } /** * @dev Writes up to 32 bytes to the buffer. Resizes if doing so would * exceed the capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @param len The number of bytes to write (left-aligned). * @return The original buffer, for chaining. */ function write(buffer memory buf, uint off, bytes32 data, uint len) private pure returns(buffer memory) { if (len + off > buf.capacity) { resize(buf, (len + off) * 2); } uint mask = 256 ** len - 1; // Right-align data data = data >> (8 * (32 - len)); assembly { // Memory address of the buffer data let bufptr := mload(buf) // Address = buffer address + sizeof(buffer length) + off + len let dest := add(add(bufptr, off), len) mstore(dest, or(and(mload(dest), not(mask)), data)) // Update buffer length if we extended it if gt(add(off, len), mload(bufptr)) { mstore(bufptr, add(off, len)) } } return buf; } /** * @dev Writes a bytes20 to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @return The original buffer, for chaining. */ function writeBytes20(buffer memory buf, uint off, bytes20 data) internal pure returns (buffer memory) { return write(buf, off, bytes32(data), 20); } /** * @dev Appends a bytes20 to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chhaining. */ function appendBytes20(buffer memory buf, bytes20 data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, bytes32(data), 20); } /** * @dev Appends a bytes32 to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function appendBytes32(buffer memory buf, bytes32 data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, 32); } /** * @dev Writes an integer to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @param len The number of bytes to write (right-aligned). * @return The original buffer, for chaining. */ function writeInt(buffer memory buf, uint off, uint data, uint len) private pure returns(buffer memory) { if (len + off > buf.capacity) { resize(buf, (len + off) * 2); } uint mask = 256 ** len - 1; assembly { // Memory address of the buffer data let bufptr := mload(buf) // Address = buffer address + off + sizeof(buffer length) + len let dest := add(add(bufptr, off), len) mstore(dest, or(and(mload(dest), not(mask)), data)) // Update buffer length if we extended it if gt(add(off, len), mload(bufptr)) { mstore(bufptr, add(off, len)) } } return buf; } /** * @dev Appends a byte to the end of the buffer. Resizes if doing so would * exceed the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer. */ function appendInt(buffer memory buf, uint data, uint len) internal pure returns(buffer memory) { return writeInt(buf, buf.buf.length, data, len); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMathChainlink { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, "SafeMath: division by zero"); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0, "SafeMath: modulo by zero"); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; contract VRFRequestIDBase { /** * @notice returns the seed which is actually input to the VRF coordinator * * @dev To prevent repetition of VRF output due to repetition of the * @dev user-supplied seed, that seed is combined in a hash with the * @dev user-specific nonce, and the address of the consuming contract. The * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in * @dev the final seed, but the nonce does protect against repetition in * @dev requests which are included in a single block. * * @param _userSeed VRF seed input provided by user * @param _requester Address of the requesting contract * @param _nonce User-specific nonce at the time of the request */ function makeVRFInputSeed(bytes32 _keyHash, uint256 _userSeed, address _requester, uint256 _nonce) internal pure returns (uint256) { return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce))); } /** * @notice Returns the id for this request * @param _keyHash The serviceAgreement ID to be used for this request * @param _vRFInputSeed The seed to be passed directly to the VRF * @return The id for this request * * @dev Note that _vRFInputSeed is not the seed passed by the consuming * @dev contract, but the one generated by makeVRFInputSeed */ function makeRequestId( bytes32 _keyHash, uint256 _vRFInputSeed) internal pure returns (bytes32) { return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed)); } }
{ "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"ChainlinkCancelled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"ChainlinkFulfilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"ChainlinkRequested","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"requestId","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"resultId","type":"uint256"}],"name":"RemoteMintFulfilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"requestId","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"firstTokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"resultId","type":"uint256"}],"name":"RemoteMintTwentyFulfilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fetchGenesisSeedFromVRF","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_requestId","type":"bytes32"},{"internalType":"uint256","name":"_resultId","type":"uint256"}],"name":"fulfill","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_requestId","type":"bytes32"},{"internalType":"uint256","name":"_resultId","type":"uint256"}],"name":"fulfillTwenty","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getBaseFeeTier","outputs":[{"internalType":"uint256","name":"baseFeeTier","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFeeTier","outputs":[{"internalType":"uint256","name":"feeTier","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGenerativeMinted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGenesisMinted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGenesisRandomSeed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOracle","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"numberToMint","type":"uint256"}],"name":"mintGenesisTrunk","outputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"randomSeed","type":"uint256"},{"internalType":"bool","name":"isBasic","type":"bool"}],"name":"mintTrunk","outputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"mintTwentyTrunks","outputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"},{"internalType":"uint256","name":"randomness","type":"uint256"}],"name":"rawFulfillRandomness","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"baseURI_","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"togglePaused","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_oracle","type":"address"},{"internalType":"bytes32","name":"_jobId","type":"bytes32"},{"internalType":"uint256","name":"_fee","type":"uint256"}],"name":"updateOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawLink","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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