Contract Name:
arteQArtDrop
Contract Source Code:
/*
* This file is part of the contracts written for artèQ Investment Fund (https://arteq.io).
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity 0.8.0;
import "@openzeppelin/contracts/interfaces/IERC165.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "./ERC721URIStorage.sol";
import "./ERC721.sol";
import "./IarteQTaskFinalizer.sol";
/// @author Kam Amini <[email protected]> <[email protected]>
///
/// @notice Use at your own risk
contract arteQArtDrop is ERC721URIStorage, IERC2981 {
string private constant DEFAULT_TOKEN_URI = "DEFAULT_TOKEN_URI";
uint256 public constant MAX_NR_TOKENS_PER_ACCOUNT = 5;
uint256 public constant MAX_RESERVATIONS_COUNT = 10000;
int256 public constant LOCKED_STAGE = 0;
int256 public constant WHITELISTING_STAGE = 2;
int256 public constant RESERVATION_STAGE = 3;
int256 public constant DISTRIBUTION_STAGE = 4;
// Counter for token IDs
uint256 private _tokenIdCounter;
// Counter for pre-minted token IDs
uint256 private _preMintedTokenIdCounter;
// number of tokens owned by the contract
uint256 _contractBalance;
address private _adminContract;
// in wei
uint256 private _pricePerToken;
// in wei
uint256 private _serviceFee;
string private _defaultTokenURI;
address _royaltyWallet;
uint256 _royaltyPercentage;
// The current art drop stage. It can have the following values:
//
// 0: Locked / Read-only mode
// 2: Selection of the registered wallets (whitelisting)
// 3: Reservation / Purchase stage
// 4: Distribution of the tokens / Drop stage
//
// * 1 is missing from the above list. That's to keep the off-chain
// and on-chain states in sync.
// * Only admin accounts with a quorum of votes can change the
// current stage.
// * Some functions only work in certain stages.
// * When the 4th stage (last stage) is finished, the contract
// will be put back into locked mode (stage 0).
// * Admins can only advance/retreat the current stage by movements of +1 or -1.
int256 private _stage;
// A mapping from the whitelisted addresses to the maximum number of tokens they can obtain
mapping(address => uint256) _whitelistedAccounts;
// Counts the number of whitelisted accounts
uint256 _whitelistedAccountsCounter;
// Counts the number of reserved tokens
uint256 _reservedTokensCounter;
// Enabled reservations without a need to be whitelisted
bool _canReserveWithoutBeingWhitelisted;
// An operator which is allowed to perform certain operations such as adding whitelisted
// accounts, removing them, or doing the token reservation for credit card payments. These
// accounts can only be defined by a quorom of votes among admins.
mapping(address => uint256) _operators;
event WhitelistedAccountAdded(address doer, address account, uint256 maxNrOfTokensToObtain);
event WhitelistedAccountRemoved(address doer, address account);
event PricePerTokenChanged(address doer, uint256 adminTaskId, uint256 oldValue, uint256 newValue);
event ServiceFeeChanged(address doer, uint256 adminTaskId, uint256 oldValue, uint256 newValue);
event StageChanged(address doer, uint256 adminTaskId, int256 oldValue, int256 newValue);
event OperatorAdded(address doer, uint256 adminTaskId, address toBeOperatorAccount);
event OperatorRemoved(address doer, uint256 adminTaskId, address toBeRemovedOperatorAccount);
event DefaultTokenURIChanged(address doer, uint256 adminTaskId, string newValue);
event TokensReserved(address doer, address target, uint256 nrOfTokensToReserve);
event Deposited(address doer, uint256 priceOfTokens, uint256 serviceFee, uint256 totalValue);
event Returned(address doer, address target, uint256 returnedValue);
event Withdrawn(address doer, address target, uint256 amount);
event TokenURIChanged(address doer, uint256 tokenId, string newValue);
event GenesisTokenURIChanged(address doer, uint256 adminTaskId, string newValue);
event RoyaltyWalletChanged(address doer, uint256 adminTaskId, address newRoyaltyWallet);
event RoyaltyPercentageChanged(address doer, uint256 adminTaskId, uint256 newRoyaltyPercentage);
event CanReserveWithoutBeingWhitelistedChanged(address doer, uint256 adminTaskId, bool newValue);
modifier adminApprovalRequired(uint256 adminTaskId) {
_;
// This must succeed otherwise the tx gets reverted
IarteQTaskFinalizer(_adminContract).finalizeTask(msg.sender, adminTaskId);
}
modifier onlyLockedStage() {
require(_stage == LOCKED_STAGE, "arteQArtDrop: only callable in locked stage");
_;
}
modifier onlyWhitelistingStage() {
require(_stage == WHITELISTING_STAGE, "arteQArtDrop: only callable in whitelisting stage");
_;
}
modifier onlyReservationStage() {
require(_stage == RESERVATION_STAGE, "arteQArtDrop: only callable in reservation stage");
_;
}
modifier onlyReservationAndDistributionStages() {
require(_stage == RESERVATION_STAGE || _stage == DISTRIBUTION_STAGE, "arteQArtDrop: only callable in reservation and distribution stage");
_;
}
modifier onlyDistributionStage() {
require(_stage == DISTRIBUTION_STAGE, "arteQArtDrop: only callable in distribution stage");
_;
}
modifier onlyWhenNotLocked() {
require(_stage > 1, "arteQArtDrop: only callable in not-locked stages");
_;
}
modifier onlyWhenNotInReservationStage() {
require(_stage != RESERVATION_STAGE, "arteQArtDrop: only callable in a non-reservation stage");
_;
}
modifier onlyOperator() {
require(_operators[msg.sender] > 0, "arteQArtDrop: not an operator account");
_;
}
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
}
constructor(
address adminContract,
string memory name,
string memory symbol,
uint256 initialPricePerToken,
uint256 initialServiceFee,
string memory initialDefaultTokenURI,
string memory initialGenesisTokenURI
) ERC721(name, symbol) {
require(adminContract != address(0), "arteQArtDrop: admin contract cannot be zero");
require(adminContract.code.length > 0, "arteQArtDrop: non-contract account for admin contract");
require(initialPricePerToken > 0, "arteQArtDrop: zero initial price per token");
require(bytes(initialDefaultTokenURI).length > 0, "arteQArtDrop: invalid default token uri");
require(bytes(initialGenesisTokenURI).length > 0, "arteQArtDrop: invalid genesis token uri");
_adminContract = adminContract;
_pricePerToken = initialPricePerToken;
emit PricePerTokenChanged(msg.sender, 0, 0, _pricePerToken);
_serviceFee = initialServiceFee;
emit ServiceFeeChanged(msg.sender, 0, 0, _serviceFee);
_defaultTokenURI = initialDefaultTokenURI;
emit DefaultTokenURIChanged(msg.sender, 0, _defaultTokenURI);
_tokenIdCounter = 1;
_preMintedTokenIdCounter = 1;
_contractBalance = 0;
_whitelistedAccountsCounter = 0;
_reservedTokensCounter = 0;
// Contract is locked/read-only by default.
_stage = 0;
emit StageChanged(msg.sender, 0, 0, _stage);
// Mint genesis token. Contract will be the eternal owner of the genesis token.
_mint(address(0), address(this), 0);
_setTokenURI(0, initialGenesisTokenURI);
_contractBalance += 1;
emit GenesisTokenURIChanged(msg.sender, 0, initialGenesisTokenURI);
_royaltyWallet = address(this);
emit RoyaltyWalletChanged(msg.sender, 0, _royaltyWallet);
_royaltyPercentage = 10;
emit RoyaltyPercentageChanged(msg.sender, 0, _royaltyPercentage);
_canReserveWithoutBeingWhitelisted = false;
emit CanReserveWithoutBeingWhitelistedChanged(msg.sender, 0, _canReserveWithoutBeingWhitelisted);
}
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
if (_exists(tokenId)) {
string memory tokenURIValue = super.tokenURI(tokenId);
if (keccak256(bytes(tokenURIValue)) == keccak256(bytes(DEFAULT_TOKEN_URI))) {
return _defaultTokenURI;
}
return tokenURIValue;
}
if (tokenId >= 1 && tokenId < _preMintedTokenIdCounter) {
return _defaultTokenURI;
}
revert("arteQArtDrop: token id does not exist");
}
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
if (_exists(tokenId)) {
return super.ownerOf(tokenId);
}
if (tokenId >= 1 && tokenId < _preMintedTokenIdCounter) {
return address(this);
}
revert("arteQArtDrop: token is does not exist");
}
function balanceOf(address owner) public view virtual override returns (uint256) {
if (owner == address(this)) {
return _contractBalance;
}
return super.balanceOf(owner);
}
function preMint(uint256 nr) external
onlyOperator {
for (uint256 i = 0; i < nr; i++) {
require(_preMintedTokenIdCounter <= MAX_RESERVATIONS_COUNT, "arteQArtDrop: cannot pre-mint more");
emit Transfer(address(0), address(this), _preMintedTokenIdCounter);
_preMintedTokenIdCounter += 1;
}
_contractBalance += nr;
}
function pricePerToken() external view returns (uint256) {
return _pricePerToken;
}
function serviceFee() external view returns (uint256) {
return _serviceFee;
}
function defaultTokenURI() external view returns (string memory) {
return _defaultTokenURI;
}
function nrPreMintedTokens() external view returns (uint256) {
return _preMintedTokenIdCounter - 1;
}
function stage() external view returns (int256) {
return _stage;
}
function royaltyPercentage() external view returns (uint256) {
return _royaltyPercentage;
}
function royaltyWallet() external view returns (address) {
return _royaltyWallet;
}
function nrOfWhitelistedAccounts() external view returns (uint256) {
return _whitelistedAccountsCounter;
}
function nrOfReservedTokens() external view returns (uint256) {
return _reservedTokensCounter;
}
function canReserveWithoutBeingWhitelisted() external view returns (bool) {
return _canReserveWithoutBeingWhitelisted;
}
function setPricePerToken(uint256 adminTaskId, uint256 newValue) external
onlyWhenNotLocked
onlyWhenNotInReservationStage
adminApprovalRequired(adminTaskId) {
require(newValue > 0, "arteQArtDrop: new price cannot be zero");
uint256 oldValue = _pricePerToken;
_pricePerToken = newValue;
emit PricePerTokenChanged(msg.sender, adminTaskId, oldValue, _pricePerToken);
}
function setServiceFee(uint256 adminTaskId, uint256 newValue) external
onlyWhenNotLocked
onlyWhenNotInReservationStage
adminApprovalRequired(adminTaskId) {
require(newValue > 0, "arteQArtDrop: new price cannot be zero");
uint256 oldValue = _serviceFee;
_serviceFee = newValue;
emit ServiceFeeChanged(msg.sender, adminTaskId, oldValue, _serviceFee);
}
function setDefaultTokenURI(uint256 adminTaskId, string memory newValue) external
onlyWhenNotLocked
onlyWhenNotInReservationStage
adminApprovalRequired(adminTaskId) {
require(bytes(newValue).length > 0, "arteQArtDrop: empty string");
_defaultTokenURI = newValue;
emit DefaultTokenURIChanged(msg.sender, adminTaskId, _defaultTokenURI);
}
function setGenesisTokenURI(uint256 adminTaskId, string memory newValue) external
onlyLockedStage
adminApprovalRequired(adminTaskId) {
require(bytes(newValue).length > 0, "arteQArtDrop: empty string");
_setTokenURI(0, newValue);
emit GenesisTokenURIChanged(msg.sender, adminTaskId, newValue);
}
function setRoyaltyWallet(uint256 adminTaskId, address newRoyaltyWallet) external
adminApprovalRequired(adminTaskId) {
require(newRoyaltyWallet != address(0), "arteQArtDrop: invalid royalty wallet");
_royaltyWallet = newRoyaltyWallet;
emit RoyaltyWalletChanged(msg.sender, adminTaskId, newRoyaltyWallet);
}
function setRoyaltyPercentage(uint256 adminTaskId, uint256 newRoyaltyPercentage) external
adminApprovalRequired(adminTaskId) {
require(newRoyaltyPercentage >= 0 && newRoyaltyPercentage <= 75, "arteQArtDrop: invalid royalty percentage");
_royaltyPercentage = newRoyaltyPercentage;
emit RoyaltyPercentageChanged(msg.sender, adminTaskId, newRoyaltyPercentage);
}
function setCanReserveWithoutBeingWhitelisted(uint256 adminTaskId, bool newValue) external
adminApprovalRequired(adminTaskId) {
_canReserveWithoutBeingWhitelisted = newValue;
emit CanReserveWithoutBeingWhitelistedChanged(msg.sender, adminTaskId, newValue);
}
function retreatStage(uint256 adminTaskId) external
adminApprovalRequired(adminTaskId) {
int256 oldStage = _stage;
_stage -= 1;
if (_stage == -1) {
_stage = 4;
} else if (_stage == 1) {
_stage = 0;
}
emit StageChanged(msg.sender, adminTaskId, oldStage, _stage);
}
function advanceStage(uint256 adminTaskId) external
adminApprovalRequired(adminTaskId) {
int256 oldStage = _stage;
_stage += 1;
if (_stage == 5) {
_stage = 0;
} else if (_stage == 1) {
_stage = 2;
}
emit StageChanged(msg.sender, adminTaskId, oldStage, _stage);
}
function addOperator(uint256 adminTaskId, address toBeOperatorAccount) external
adminApprovalRequired(adminTaskId) {
require(toBeOperatorAccount != address(0), "arteQArtDrop: cannot set zero as operator");
require(_operators[toBeOperatorAccount] == 0, "arteQArtDrop: already an operator");
_operators[toBeOperatorAccount] = 1;
emit OperatorAdded(msg.sender, adminTaskId, toBeOperatorAccount);
}
function removeOperator(uint256 adminTaskId, address toBeRemovedOperatorAccount) external
adminApprovalRequired(adminTaskId) {
require(toBeRemovedOperatorAccount != address(0), "arteQArtDrop: cannot remove zero as operator");
require(_operators[toBeRemovedOperatorAccount] == 1, "arteQArtDrop: not an operator");
_operators[toBeRemovedOperatorAccount] = 0;
emit OperatorRemoved(msg.sender, adminTaskId, toBeRemovedOperatorAccount);
}
function isOperator(address account) external view returns(bool) {
return _operators[account] == 1;
}
function addToWhitelistedAccounts(
address[] memory accounts,
uint[] memory listOfMaxNrOfTokensToObtain
) external
onlyOperator
onlyWhitelistingStage {
require(accounts.length > 0, "arteQArtDrop: zero length");
require(listOfMaxNrOfTokensToObtain.length > 0, "arteQArtDrop: zero length");
require(accounts.length == listOfMaxNrOfTokensToObtain.length, "arteQArtDrop: different lengths");
for (uint256 i = 0; i < accounts.length; i++) {
address account = accounts[i];
uint256 maxNrOfTokensToObtain = listOfMaxNrOfTokensToObtain[i];
require(account != address(0), "arteQArtDrop: cannot whitelist zero address");
require(maxNrOfTokensToObtain >= 1 && maxNrOfTokensToObtain <= MAX_NR_TOKENS_PER_ACCOUNT,
"arteQArtDrop: invalid nr of tokens to obtain");
require(account.code.length == 0, "arteQArtDrop: cannot whitelist a contract");
require(_whitelistedAccounts[account] == 0, "arteQArtDrop: already whitelisted");
_whitelistedAccounts[account] = maxNrOfTokensToObtain;
_whitelistedAccountsCounter += 1;
emit WhitelistedAccountAdded(msg.sender, account, maxNrOfTokensToObtain);
}
}
function removeFromWhitelistedAccounts(address[] memory accounts) external
onlyOperator
onlyWhitelistingStage {
require(accounts.length > 0, "arteQArtDrop: zero length");
for (uint256 i = 0; i < accounts.length; i++) {
address account = accounts[i];
require(account != address(0), "arteQArtDrop: cannot remove zero address");
require(_whitelistedAccounts[account] > 0, "arteQArtDrop: account is not whitelisted");
_whitelistedAccounts[account] = 0;
_whitelistedAccountsCounter -= 1;
emit WhitelistedAccountRemoved(msg.sender, account);
}
}
function whitelistedNrOfTokens(address account) external view returns (uint256) {
if (!_canReserveWithoutBeingWhitelisted) {
return _whitelistedAccounts[account];
}
if (_whitelistedAccounts[account] == 0) {
return MAX_NR_TOKENS_PER_ACCOUNT;
}
return _whitelistedAccounts[account];
}
// Only callable by a whitelisted account
//
// * Account must have sent enough ETH to cover the price of all tokens + service fee
// * Account cannot reserve more than what has been whitelisted for
function reserveTokens(uint256 nrOfTokensToReserve) external payable
onlyReservationAndDistributionStages {
require(msg.value > 0, "arteQArtDrop: zero funds");
require(nrOfTokensToReserve > 0, "arteQArtDrop: zero tokens to reserve");
if (_canReserveWithoutBeingWhitelisted && _whitelistedAccounts[msg.sender] == 0) {
_whitelistedAccounts[msg.sender] = 5;
}
require(_whitelistedAccounts[msg.sender] > 0, "arteQArtDrop: not a whitelisted account");
require(nrOfTokensToReserve <= _whitelistedAccounts[msg.sender],
"arteQArtDrop: exceeding the reservation allowance");
require((_reservedTokensCounter + nrOfTokensToReserve) <= MAX_RESERVATIONS_COUNT,
"arteQArtDrop: exceeding max number of reservations");
// Handle payments
uint256 priceOfTokens = nrOfTokensToReserve * _pricePerToken;
uint256 priceToPay = priceOfTokens + _serviceFee;
require(msg.value >= priceToPay, "arteQArtDrop: insufficient funds");
uint256 remainder = msg.value - priceToPay;
if (remainder > 0) {
(bool success, ) = msg.sender.call{value: remainder}(new bytes(0));
require(success, "arteQArtDrop: failed to send the remainder");
emit Returned(msg.sender, msg.sender, remainder);
}
emit Deposited(msg.sender, priceOfTokens, _serviceFee, priceToPay);
_reserveTokens(msg.sender, nrOfTokensToReserve);
}
// This method is called by an operator to complete the reservation of fiat payments
// such as credit card, iDeal, etc.
function reserveTokensForAccounts(
address[] memory accounts,
uint256[] memory listOfNrOfTokensToReserve
) external
onlyOperator
onlyReservationAndDistributionStages {
require(accounts.length > 0, "arteQArtDrop: zero length");
require(listOfNrOfTokensToReserve.length > 0, "arteQArtDrop: zero length");
require(accounts.length == listOfNrOfTokensToReserve.length, "arteQArtDrop: different lengths");
for (uint256 i = 0; i < accounts.length; i++) {
address account = accounts[i];
uint256 nrOfTokensToReserve = listOfNrOfTokensToReserve[i];
require(account != address(0), "arteQArtDrop: cannot be zero address");
if (_canReserveWithoutBeingWhitelisted && _whitelistedAccounts[account] == 0) {
_whitelistedAccounts[account] = 5;
}
require(_whitelistedAccounts[account] > 0, "arteQArtDrop: not a whitelisted account");
require(nrOfTokensToReserve <= _whitelistedAccounts[account],
"arteQArtDrop: exceeding the reservation allowance");
_reserveTokens(account, nrOfTokensToReserve);
}
}
function updateTokenURIs(uint256[] memory tokenIds, string[] memory newTokenURIs) external
onlyOperator
onlyDistributionStage {
require(tokenIds.length > 0, "arteQArtDrop: zero length");
require(newTokenURIs.length > 0, "arteQArtDrop: zero length");
require(tokenIds.length == newTokenURIs.length, "arteQArtDrop: different lengths");
for (uint256 i = 0; i < tokenIds.length; i++) {
uint256 tokenId = tokenIds[i];
string memory newTokenURI = newTokenURIs[i];
require(tokenId > 0, "arteQArtDrop: cannot alter genesis token");
require(bytes(newTokenURI).length > 0, "arteQArtDrop: empty string");
_setTokenURI(tokenId, newTokenURI);
emit TokenURIChanged(msg.sender, tokenId, newTokenURI);
}
}
function transferTo(address target, uint256 amount) external
onlyOperator {
require(target != address(0), "arteQArtDrop: target cannot be zero");
require(amount > 0, "arteQArtDrop: cannot transfer zero");
require(amount <= address(this).balance, "arteQArtDrop: transfer more than balance");
(bool success, ) = target.call{value: amount}(new bytes(0));
require(success, "arteQArtDrop: failed to transfer");
emit Withdrawn(msg.sender, target, amount);
}
function royaltyInfo(uint256, uint256 salePrice) external view virtual override returns (address, uint256) {
uint256 royalty = (salePrice * _royaltyPercentage) / 100;
return (_royaltyWallet, royalty);
}
function _reserveTokens(address target, uint256 nrOfTokensToReserve) internal {
for (uint256 i = 1; i <= nrOfTokensToReserve; i++) {
uint256 newTokenId = _tokenIdCounter;
_mint(address(this), target, newTokenId);
_setTokenURI(newTokenId, DEFAULT_TOKEN_URI);
_tokenIdCounter += 1;
require(_reservedTokensCounter <= MAX_RESERVATIONS_COUNT,
"arteQArtDrop: exceeding max number of reservations");
_reservedTokensCounter += 1;
}
if ((_contractBalance - 1) > nrOfTokensToReserve) {
_contractBalance -= nrOfTokensToReserve;
} else {
_contractBalance = 1; // eventually, the contract must only own the genesis token
}
require(_contractBalance >= 1, "arteQArtDrop: contract balance went below 1");
_whitelistedAccounts[target] -= nrOfTokensToReserve;
require(_whitelistedAccounts[target] >= 0, "arteQArtDrop: should not happen");
emit TokensReserved(msg.sender, target, nrOfTokensToReserve);
}
receive() external payable {
revert("arteQArtDrop: cannot accept ether");
}
fallback() external payable {
revert("arteQArtDrop: cannot accept ether");
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/introspection/IERC165.sol";
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Interface for the NFT Royalty Standard
*/
interface IERC2981 is IERC165 {
/**
* @dev Called with the sale price to determine how much royalty is owed and to whom.
* @param tokenId - the NFT asset queried for royalty information
* @param salePrice - the sale price of the NFT asset specified by `tokenId`
* @return receiver - address of who should be sent the royalty payment
* @return royaltyAmount - the royalty payment amount for `salePrice`
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice)
external
view
returns (address receiver, uint256 royaltyAmount);
}
/*
* This file is part of the contracts written for artèQ Investment Fund (https://github.com/billionbuild/arteq-contracts).
* Copyright (c) 2021 BillionBuild (2B) Team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GNU General Public License v3.0
// Based on OpenZeppelin Contracts v4.3.2 (token/ERC721/extensions/ERC721URIStorage.sol)
pragma solidity 0.8.0;
import "./ERC721.sol";
/**
* @author Modified by Kam Amini <[email protected]> <[email protected]> <[email protected]>
*
* @notice Use at your own risk
*
* Note: 2B has modified the original code to cover its needs as
* part of artèQ Investment Fund ecosystem
*
* @dev ERC721 token with storage based token URI management.
*/
abstract contract ERC721URIStorage is ERC721 {
using Strings for uint256;
// Optional mapping for token URIs
mapping(uint256 => string) private _tokenURIs;
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721URIStorage: 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));
}
return super.tokenURI(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), "ERC721URIStorage: URI set of nonexistent token");
_tokenURIs[tokenId] = _tokenURI;
}
/**
* @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 override {
super._burn(tokenId);
if (bytes(_tokenURIs[tokenId]).length != 0) {
delete _tokenURIs[tokenId];
}
}
}
/*
* This file is part of the contracts written for artèQ Investment Fund (https://github.com/billionbuild/arteq-contracts).
* Copyright (c) 2021 BillionBuild (2B) Team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity 0.8.0;
import "@openzeppelin/contracts/interfaces/IERC721.sol";
import "@openzeppelin/contracts/interfaces/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
/**
* @author Modified by Kam Amini <[email protected]> <[email protected]> <[email protected]>
*
* @notice Use at your own risk
*
* Note: 2B has modified the original code to cover its needs as
* part of artèQ Investment Fund ecosystem
*
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overriden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not 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 _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(address(0), 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 from, address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(from, to, tokenId);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, 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);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[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");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @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` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
/*
* This file is part of the contracts written for artèQ Investment Fund (https://github.com/billionbuild/arteq-contracts).
* Copyright (c) 2021 BillionBuild (2B) Team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity 0.8.0;
/// @author Kam Amini <[email protected]> <[email protected]> <[email protected]>
/// @title The interface for finalizing tasks. Mainly used by artèQ contracts to
/// perform administrative tasks in conjuction with admin contract.
interface IarteQTaskFinalizer {
event TaskFinalized(address finalizer, address origin, uint256 taskId);
function finalizeTask(address origin, uint256 taskId) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../token/ERC721/IERC721.sol";
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../token/ERC721/IERC721Receiver.sol";
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, 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 ^0.8.0;
/**
* @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);
}