Contract Name:
AerialIcons
Contract Source Code:
// SPDX-License-Identifier: SPDX-License
pragma solidity ^0.8.6;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
/*
_____ _____ _____ _____ _____ _____
/\ \ /\ \ /\ \ /\ \ /\ \ /\ \
/::\ \ /::\ \ /::\ \ /::\ \ /::\ \ /::\____\
/::::\ \ /::::\ \ /::::\ \ \:::\ \ /::::\ \ /:::/ /
/::::::\ \ /::::::\ \ /::::::\ \ \:::\ \ /::::::\ \ /:::/ /
/:::/\:::\ \ /:::/\:::\ \ /:::/\:::\ \ \:::\ \ /:::/\:::\ \ /:::/ /
/:::/__\:::\ \ /:::/__\:::\ \ /:::/__\:::\ \ \:::\ \ /:::/__\:::\ \ /:::/ /
/::::\ \:::\ \ /::::\ \:::\ \ /::::\ \:::\ \ /::::\ \ /::::\ \:::\ \ /:::/ /
/::::::\ \:::\ \ /::::::\ \:::\ \ /::::::\ \:::\ \ ____ /::::::\ \ /::::::\ \:::\ \ /:::/ /
/:::/\:::\ \:::\ \ /:::/\:::\ \:::\ \ /:::/\:::\ \:::\____\ /\ \ /:::/\:::\ \ /:::/\:::\ \:::\ \ /:::/ /
/:::/ \:::\ \:::\____\/:::/__\:::\ \:::\____\/:::/ \:::\ \:::| |/::\ \/:::/ \:::\____\/:::/ \:::\ \:::\____\/:::/____/
\::/ \:::\ /:::/ /\:::\ \:::\ \::/ /\::/ |::::\ /:::|____|\:::\ /:::/ \::/ /\::/ \:::\ /:::/ /\:::\ \
\/____/ \:::\/:::/ / \:::\ \:::\ \/____/ \/____|:::::\/:::/ / \:::\/:::/ / \/____/ \/____/ \:::\/:::/ / \:::\ \
\::::::/ / \:::\ \:::\ \ |:::::::::/ / \::::::/ / \::::::/ / \:::\ \
\::::/ / \:::\ \:::\____\ |::|\::::/ / \::::/____/ \::::/ / \:::\ \
/:::/ / \:::\ \::/ / |::| \::/____/ \:::\ \ /:::/ / \:::\ \
/:::/ / \:::\ \/____/ |::| ~| \:::\ \ /:::/ / \:::\ \
/:::/ / \:::\ \ |::| | \:::\ \ /:::/ / \:::\ \
/:::/ / \:::\____\ \::| | \:::\____\ /:::/ / \:::\____\
\::/ / \::/ / \:| | \::/ / \::/ / \::/ /
\/____/ \/____/ \|___| \/____/ \/____/ \/____/
_____ _____ _______ _____ _____
/\ \ /\ \ /::\ \ /\ \ /\ \
/::\ \ /::\ \ /::::\ \ /::\____\ /::\ \
\:::\ \ /::::\ \ /::::::\ \ /::::| | /::::\ \
\:::\ \ /::::::\ \ /::::::::\ \ /:::::| | /::::::\ \
\:::\ \ /:::/\:::\ \ /:::/~~\:::\ \ /::::::| | /:::/\:::\ \
\:::\ \ /:::/ \:::\ \ /:::/ \:::\ \ /:::/|::| | /:::/__\:::\ \
/::::\ \ /:::/ \:::\ \ /:::/ / \:::\ \ /:::/ |::| | \:::\ \:::\ \
____ /::::::\ \ /:::/ / \:::\ \ /:::/____/ \:::\____\ /:::/ |::| | _____ ___\:::\ \:::\ \
/\ \ /:::/\:::\ \ /:::/ / \:::\ \ |:::| | |:::| | /:::/ |::| |/\ \ /\ \:::\ \:::\ \
/::\ \/:::/ \:::\____\/:::/____/ \:::\____\|:::|____| |:::| |/:: / |::| /::\____\/::\ \:::\ \:::\____\
\:::\ /:::/ \::/ /\:::\ \ \::/ / \:::\ \ /:::/ / \::/ /|::| /:::/ /\:::\ \:::\ \::/ /
\:::\/:::/ / \/____/ \:::\ \ \/____/ \:::\ \ /:::/ / \/____/ |::| /:::/ / \:::\ \:::\ \/____/
\::::::/ / \:::\ \ \:::\ /:::/ / |::|/:::/ / \:::\ \:::\ \
\::::/____/ \:::\ \ \:::\__/:::/ / |::::::/ / \:::\ \:::\____\
\:::\ \ \:::\ \ \::::::::/ / |:::::/ / \:::\ /:::/ /
\:::\ \ \:::\ \ \::::::/ / |::::/ / \:::\/:::/ /
\:::\ \ \:::\ \ \::::/ / /:::/ / \::::::/ /
\:::\____\ \:::\____\ \::/____/ /:::/ / \::::/ /
\::/ / \::/ / ~~ \::/ / \::/ /
\/____/ \/____/ \/____/ \/____/
*/
struct FlightPass {
bool claimed;
bool exists;
}
struct Hookup {
bool exists;
uint256 price;
}
struct HookupList {
mapping(address => Hookup) addressPriceMapping;
uint256 addressCount;
}
struct ReserveList {
mapping(address => bool) addressMapping;
uint256 addressCount;
}
contract AerialIcons is ERC721, Ownable {
address public sweetAndy = 0xBE7B3DB607525EA25956B4d28d6e552967225622;
string public baseURI;
uint128 public revealIndex = 0;
uint128 public dropCount = 0;
uint128 public dropSize = 0;
uint128 private constant MAX_SUPPLY = 100; // Max supply
uint256 public presalePrice = 250000000000000000; // 0.25 eth presale price
uint256 public listPrice = 330000000000000000; // 0.33 eth list price
mapping(uint256 => FlightPass) private flightPassMap; // mapping for winning flight path indexes
mapping(uint256 => string) private flightPassRedemptionMap; // mapping for winning flight path indexes
ReserveList private presale;
HookupList private hookup;
uint128 public currentDropReserveCount = 0;
uint128 public currentDropReserveIndex = 0;
mapping(uint128 => mapping(address => bool)) public currentDropReserve;
// Keep track of state
using Counters for Counters.Counter;
Counters.Counter private boardingPassCounter;
Counters.Counter private flightPassCounter;
/**
* @param _baseURI base uri for tokens
* @param _presaleAddresses - list of presale addresses
*/
constructor(
string memory _baseURI,
address[] memory _presaleAddresses,
uint256[] memory _flightPassIndexes
) ERC721("AerialIcons", "AerialIcons") {
baseURI = _baseURI;
setPresaleAddresses(_presaleAddresses);
for (uint128 i = 0; i < _flightPassIndexes.length; i++) {
flightPassMap[_flightPassIndexes[i]] = FlightPass({
claimed: false,
exists: true
});
}
}
// General contract state
/*------------------------------------*/
/**
* Add an address to current drop.
*/
function reserveForCurrentDrop(address _address) public onlyOwner {
require(
!currentDropReserve[currentDropReserveIndex][_address],
"ADDRESS_ALEADY_IN_DROP"
);
currentDropReserve[currentDropReserveIndex][_address] = true;
currentDropReserveCount = currentDropReserveCount + 1;
}
/**
* Remove address from drop
*/
function removeFromCurrentDrop(address _address) public onlyOwner {
require(
currentDropReserve[currentDropReserveIndex][_address],
"ADDRESS_NOT_IN_DROP"
);
currentDropReserve[currentDropReserveIndex][_address] = false;
currentDropReserveCount = currentDropReserveCount - 1;
}
/**
* Set a new drop
*/
function handleNewDrop(
uint128 _dropCount,
address[] memory _reservedAddresses
) public onlyOwner {
dropCount = _dropCount;
dropSize = _dropCount;
currentDropReserveCount = 0;
currentDropReserveIndex = currentDropReserveIndex + 1;
for (uint128 i = 0; i < _reservedAddresses.length; i++) {
reserveForCurrentDrop(_reservedAddresses[i]);
}
}
/**
* Set a new drop without reserve addresses
*/
function handleRawNewDrop(uint128 _dropCount) public onlyOwner {
dropCount = _dropCount;
dropSize = _dropCount;
currentDropReserveCount = 0;
currentDropReserveIndex = currentDropReserveIndex + 1;
}
/**
* Escape hatch to update reveal index
*/
function handleReveal(uint128 _revealIndex) public onlyOwner {
revealIndex = _revealIndex;
}
/**
* Escape hatch to update price.
*/
function setPresalePrice(uint128 _presalePrice) public onlyOwner {
presalePrice = _presalePrice;
}
/**
* Escape hatch to update list price.
*/
function setListPrice(uint128 _listPrice) public onlyOwner {
listPrice = _listPrice;
}
/**
* Escape hatch to update URI.
*/
function setBaseURI(string memory _baseURI) public onlyOwner {
baseURI = _baseURI;
}
/**
* Update a flight passes redemption URI.
*/
function setFlightPassRedemptionURI(
uint256 _tokenId,
string memory _redemptionURI
) public onlyOwner {
flightPassRedemptionMap[_tokenId] = _redemptionURI;
}
/**
* Add flight pass for certain token index
*/
function setFlightPassIndex(uint256 _tokenId) public onlyOwner {
require(!flightPassMap[_tokenId].claimed, "FLIGHT_PASS_CLAIMED");
flightPassMap[_tokenId] = FlightPass({ exists: true, claimed: false });
}
/**
* Update sweet baby andy's address in the event of an emergency
*/
function setSweetAndy(address _sweetAndy) public onlyOwner {
sweetAndy = _sweetAndy;
}
/*
* Withdraw, sends:
* 95% of all past sales to artist.
* 5% of all past sales to devs.
*/
function withdraw() public onlyOwner {
// Pass collaborators their cut
uint256 balance = address(this).balance;
// Send devs 4.95%
(bool success, ) = sweetAndy.call{ value: (balance * 5) / 100 }("");
require(success, "FAILED_SEND_DEV");
// Send owner remainder
(success, ) = owner().call{ value: (balance * 95) / 100 }("");
require(success, "FAILED_SEND_OWNER");
}
/**
* Add a single address to the reserve list.
*/
function addPresaleAddress(address _address) public onlyOwner {
require(
!presale.addressMapping[_address],
"PRESALE_ADDRESS_ALREADY_EXISTS"
);
presale.addressMapping[_address] = true;
presale.addressCount = presale.addressCount + 1;
}
/**
* Add addresses to presale.
*/
function setPresaleAddresses(address[] memory _addresses) public onlyOwner {
for (uint128 i = 0; i < _addresses.length; i++) {
// Do not incrememnt counter if this address already exists
if (!presale.addressMapping[_addresses[i]]) {
presale.addressMapping[_addresses[i]] = true;
presale.addressCount = presale.addressCount + 1;
}
}
}
/**
* Remove from presale.
*/
function removePresaleAddress(address _address) public onlyOwner {
require(presale.addressMapping[_address], "RESERVE_ADDRESS_DNE");
presale.addressMapping[_address] = false;
presale.addressCount = presale.addressCount - 1;
}
/**
* Add a single address to the hookup.
*/
function addHookupAddress(address _address, uint256 _price)
public
onlyOwner
{
require(
!hookup.addressPriceMapping[_address].exists,
"HOOKUP_ADDRESS_ALREADY_EXISTS"
);
hookup.addressPriceMapping[_address] = Hookup({
exists: true,
price: _price
});
hookup.addressCount = hookup.addressCount + 1;
}
/**
* Add addresses to hookup.
* A bit wacky, but addresses and prices are parallel arrays that
* compose into matching key-value pairs.
*/
function setHookupAddresses(
address[] memory _addresses,
uint256[] memory _prices
) public onlyOwner {
require(
_addresses.length == _prices.length,
"HOOKUP_ARRAYS_MUST_BE_PARALLEL"
);
for (uint128 i = 0; i < _addresses.length; i++) {
// Do not incrememnt counter if this address already exists
if (!hookup.addressPriceMapping[_addresses[i]].exists) {
hookup.addressPriceMapping[_addresses[i]] = Hookup({
exists: true,
price: _prices[i]
});
hookup.addressCount = hookup.addressCount + 1;
}
}
}
/**
* Remove from hookup list
*/
function removeFromHookup(address _address) public onlyOwner {
require(
hookup.addressPriceMapping[_address].exists,
"HOOKUP_ADDRESS_DNE"
);
delete hookup.addressPriceMapping[_address];
hookup.addressCount = hookup.addressCount - 1;
}
function getTotalReserved() private view returns (uint256) {
return (presale.addressCount + hookup.addressCount);
}
function isAddressReserved(address _address) private view returns (bool) {
return
presale.addressMapping[_address] ||
hookup.addressPriceMapping[_address].exists;
}
// Minting
/*------------------------------------*/
function handleDropCount() private {
dropCount = dropCount - 1;
if (dropCount == 0) {
revealIndex = revealIndex + dropSize;
}
}
/**
* Mint boarding pass
*/
function handleBoardingPass() private {
_safeMint(msg.sender, boardingPassCounter.current());
handleDropCount();
boardingPassCounter.increment();
}
/**
* Mint flight pass
*/
function handleFlightPass() private {
_safeMint(msg.sender, MAX_SUPPLY - (flightPassCounter.current() + 1));
flightPassCounter.increment();
flightPassMap[boardingPassCounter.current()].claimed = true;
handleDropCount();
}
/**
* Mint
*/
function mint(uint128 purchaseCount) public payable {
uint256 finalPrice = listPrice;
if (hookup.addressPriceMapping[msg.sender].exists) {
finalPrice = hookup.addressPriceMapping[msg.sender].price;
} else if (presale.addressMapping[msg.sender]) {
finalPrice = presalePrice;
}
require(
msg.value >= finalPrice + (listPrice * (purchaseCount - 1)),
"LOW_ETH"
);
require(
(currentDropReserve[currentDropReserveIndex][msg.sender] &&
dropCount + 1 >= purchaseCount + currentDropReserveCount) ||
dropCount >= (purchaseCount + currentDropReserveCount),
"DROP_SUPPLY_REACHED"
);
require(
isAddressReserved(msg.sender) ||
boardingPassCounter.current() +
flightPassCounter.current() +
getTotalReserved() +
purchaseCount -
1 <
MAX_SUPPLY,
"MAX_SUPPLY_REACHED"
);
if (currentDropReserve[currentDropReserveIndex][msg.sender]) {
delete currentDropReserve[currentDropReserveIndex][msg.sender];
currentDropReserveCount = currentDropReserveCount - 1;
}
for (uint256 i = 0; i < purchaseCount; i++) {
uint256 nextTokenId = boardingPassCounter.current();
FlightPass memory flightPass = flightPassMap[nextTokenId];
if (flightPass.exists && !flightPass.claimed) {
handleFlightPass();
} else {
handleBoardingPass();
}
}
}
// ERC721 Things
/*------------------------------------*/
/**
* Get total token supply
*/
function totalSupply() public view returns (uint256) {
return boardingPassCounter.current() + flightPassCounter.current();
}
/**
* Get token URI
*/
function tokenURI(uint256 _tokenId)
public
view
override
returns (string memory)
{
require(_exists(_tokenId), "TOKEN_DNE");
if (_tokenId >= MAX_SUPPLY - flightPassCounter.current()) {
if (bytes(flightPassRedemptionMap[_tokenId]).length != 0) {
return flightPassRedemptionMap[_tokenId];
} else {
return string(abi.encodePacked(baseURI, "flight_pass"));
}
} else if (_tokenId + flightPassCounter.current() + 1 > revealIndex) {
return string(abi.encodePacked(baseURI, "boarding_pass"));
}
return string(abi.encodePacked(baseURI, Strings.toString(_tokenId)));
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: 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 {
_setApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: 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(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);
_balances[to] += 1;
_owners[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);
_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 Approve `operator` to operate on all of `owner` tokens
*
* Emits a {ApprovalForAll} event.
*/
function _setApprovalForAll(
address owner,
address operator,
bool approved
) internal virtual {
require(owner != operator, "ERC721: approve to caller");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
/**
* @dev 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 {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
pragma solidity ^0.8.0;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. 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;`
*/
library Counters {
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 {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev 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 {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, 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
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
