Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./Traits.sol";
import "./Traits2.sol";
contract Heroes is ERC721Enumerable, Ownable, ReentrancyGuard {
using ECDSA for bytes32;
uint256 PRICE_PER_TOKEN = 0.08 ether;
uint256 MAX_SUPPLY = 3333;
address SIGNER;
uint256 currentId;
string BASE_URI;
mapping(uint256 => uint256) public tokenIdToSeed;
HeroTraits traitStorage;
HeroTraits2 traitStorage2;
constructor(
string memory baseUri,
string memory name,
address traits,
address traits2
) ERC721(name, "HERO") {
BASE_URI = baseUri;
traitStorage = HeroTraits(traits);
traitStorage2 = HeroTraits2(traits2);
}
function withdraw(address sendTo) public onlyOwner {
uint256 balance = address(this).balance;
payable(sendTo).transfer(balance);
}
struct Traits {
uint256 race;
uint256 pants;
uint256 weapon;
uint256 shield;
uint256 clothes;
uint256 head;
uint256 shoes;
uint256 hair;
uint256 bg;
uint256 magic;
uint256 strength;
uint256 intelligence;
uint256 stamina;
uint256 dexterity;
uint256 creativity;
}
function getSeed(uint256 tokenId) public view returns (uint256) {
return tokenIdToSeed[tokenId];
}
// get trait modulo 10 and then have a percentage
function _getRandomMod(uint256 rand, uint256 chance)
internal
pure
returns (bool)
{
return ((rand % 1000) + 1) <= chance;
}
function genTraits(uint256 tokenId) public view returns (Traits memory) {
uint256 seed = getSeed(tokenId);
Traits memory traits = Traits({
race: uint256(keccak256(abi.encode(seed, 1))),
pants: uint256(keccak256(abi.encode(seed, 2))),
weapon: uint256(keccak256(abi.encode(seed, 3))),
shield: uint256(keccak256(abi.encode(seed, 4))),
clothes: uint256(keccak256(abi.encode(seed, 5))),
head: uint256(keccak256(abi.encode(seed, 6))),
shoes: uint256(keccak256(abi.encode(seed, 7))),
hair: uint256(keccak256(abi.encode(seed, 8))),
bg: uint256(keccak256(abi.encode(seed, 9))),
magic: uint256(keccak256(abi.encode(seed, 10))),
strength: uint256(keccak256(abi.encode(seed, 11))),
intelligence: uint256(keccak256(abi.encode(seed, 12))),
stamina: uint256(keccak256(abi.encode(seed, 13))),
dexterity: uint256(keccak256(abi.encode(seed, 14))),
creativity: uint256(keccak256(abi.encode(seed, 15)))
});
uint256 head = _getRandomMod(traits.head, 500)
? traits.head % traitStorage.getHeadLength()
: 0;
bool isHood = head >= 1 && head <= 5;
// default is human1
uint256 race = 0;
bool isHuman1 = _getRandomMod(traits.race, 500);
bool isHuman2 = _getRandomMod(traits.race, 340);
bool isHuman3 = _getRandomMod(traits.race, 180);
bool isZombie = _getRandomMod(traits.race, 600);
bool isSkeleton = _getRandomMod(traits.race, 700);
bool isWizard = _getRandomMod(traits.race, 800);
bool isGhost = _getRandomMod(traits.race, 900);
bool isFrog = _getRandomMod(traits.race, 960);
bool isPizza = _getRandomMod(traits.race, 970);
if (isHuman3) {
race = 2;
} else if (isHuman2) {
race = 1;
} else if (isHuman1) {
race = 0;
} else if (isZombie) {
race = 3;
} else if (isSkeleton) {
race = 4;
} else if (isWizard) {
race = 5;
} else if (isGhost) {
race = 6;
} else if (isFrog) {
race = 7;
} else if (isPizza) {
race = 8;
// monkies
} else if (_getRandomMod(traits.race, 972)) {
race = 9;
} else if (_getRandomMod(traits.race, 974)) {
race = 10;
} else if (_getRandomMod(traits.race, 976)) {
race = 11;
} else if (_getRandomMod(traits.race, 978)) {
race = 12;
} else if (_getRandomMod(traits.race, 980)) {
race = 13;
} else if (_getRandomMod(traits.race, 982)) {
race = 14;
} else if (_getRandomMod(traits.race, 984)) {
race = 15;
} else if (_getRandomMod(traits.race, 986)) {
race = 16;
} else if (_getRandomMod(traits.race, 988)) {
race = 17;
} else if (_getRandomMod(traits.race, 990)) {
race = 18;
} else if (_getRandomMod(traits.race, 993)) {
race = 19;
} else if (_getRandomMod(traits.race, 997)) {
race = 20;
} else if (_getRandomMod(traits.race, 1000)) {
race = 21;
}
return
Traits({
race: race,
weapon: _getRandomMod(traits.weapon, 800)
? traits.weapon % traitStorage.getWeaponsLength()
: 0,
clothes: traits.clothes % traitStorage.getClothesLength(),
shield: _getRandomMod(traits.shield, 100)
? traits.shield % traitStorage.getShieldsLength()
: 0,
head: head,
pants: traits.pants % traitStorage.getPantsLength(),
bg: traits.bg % traitStorage.getBgLength(),
hair: isHood ? 0 : _getRandomMod(traits.weapon, 950)
? traits.hair % traitStorage2.getHairLength()
: 0,
shoes: traits.shoes % traitStorage.getShoesLength(),
magic: (traits.magic % 1000) + 1,
strength: (traits.strength % 1000) + 1,
intelligence: (traits.intelligence % 1000) + 1,
stamina: (traits.stamina % 1000) + 1,
dexterity: (traits.dexterity % 1000) + 1,
creativity: (traits.creativity % 1000) + 1
});
}
function genSvg(uint256 tokenId) public view returns (string memory) {
require(_exists(tokenId), "Token ID does not exist");
Traits memory traits = genTraits(tokenId);
string[9] memory parts;
// bg
// shadow
// base
// shoes
// pants
// clothes
// hair
// hats
// shield
// weapons
// bg, shadow
parts[0] = string(
abi.encodePacked(
'<rect width="100%" height="100%" fill="',
traitStorage.getBg()[traits.bg],
'" />',
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getShadow(),
'" />'
)
);
// race
parts[1] = string(
abi.encodePacked(
'<g transform=""><image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getRace()[traits.race][1],
'" />'
)
);
// shoes
parts[2] = traits.shoes == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getShoes()[traits.shoes][1],
'" />'
)
);
// pants
parts[3] = string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getPants()[traits.pants][1],
'" />'
)
);
// clothes
parts[4] = traits.clothes == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getClothes()[traits.clothes][1],
'" />'
)
);
parts[5] = traits.hair == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage2.getHair()[traits.hair][1],
'" />'
)
);
// hats
parts[6] = traits.head == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getHead()[traits.head][1],
'" />'
)
);
// shield
parts[7] = traits.shield == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getShields()[traits.shield][1],
'" />'
)
);
// weapon
parts[8] = traits.weapon == 0
? ""
: string(
abi.encodePacked(
'<image width="100%" height="100%" href="',
_baseURI(),
traitStorage.getWeapons()[traits.weapon][1],
'" />'
)
);
string memory svg = string(
abi.encodePacked(
'<svg version="1.1" viewBox="0 0 800 800" width="800" height="800" xmlns="http://www.w3.org/2000/svg">',
parts[0],
parts[1],
parts[2],
parts[3],
parts[4],
parts[5],
parts[6],
parts[7],
parts[8],
"</g></svg>"
)
);
return svg;
}
function getSeedPart(uint256 tokenId, uint256 num)
public
view
returns (uint16)
{
return uint16(getSeed(tokenId) >> num);
}
function setBaseUri(string memory baseUri) public onlyOwner {
BASE_URI = baseUri;
}
function _baseURI() internal view virtual override returns (string memory) {
return BASE_URI;
}
string DESCRIPTION;
function updateDescription(string memory d) public onlyOwner {
DESCRIPTION = d;
}
function uintToStr(uint256 _i)
internal
pure
returns (string memory _uintAsString)
{
if (_i == 0) {
return "0";
}
uint256 j = _i;
uint256 len;
while (j != 0) {
len++;
j /= 10;
}
bytes memory bstr = new bytes(len);
uint256 k = len;
while (_i != 0) {
k = k - 1;
uint8 temp = (48 + uint8(_i - (_i / 10) * 10));
bytes1 b1 = bytes1(temp);
bstr[k] = b1;
_i /= 10;
}
return string(bstr);
}
function updateSigner(address signer) public onlyOwner {
SIGNER = signer;
}
function _genOptionalTraits(Traits memory traits)
internal
view
returns (string memory)
{
// 0 weapon
// 1 shield
// 2 head
// 3 hair
// 4 clothes
// 5 shoes
string[6] memory parts;
if (traits.weapon != 0) {
parts[0] = string(
abi.encodePacked(
',{"trait_type":"Weapon","value":"',
traitStorage.getWeapons()[traits.weapon][0],
'"}'
)
);
}
if (traits.shield != 0) {
parts[1] = string(
abi.encodePacked(
',{"trait_type":"Shield","value":"',
traitStorage.getShields()[traits.shield][0],
'"}'
)
);
}
if (traits.head != 0) {
parts[2] = string(
abi.encodePacked(
',{"trait_type":"Head","value":"',
traitStorage.getHead()[traits.head][0],
'"}'
)
);
}
if (traits.hair != 0) {
parts[3] = string(
abi.encodePacked(
',{"trait_type":"Hair","value":"',
traitStorage2.getHair()[traits.hair][0],
'"}'
)
);
}
if (traits.clothes != 0) {
parts[4] = string(
abi.encodePacked(
',{"trait_type":"Clothes","value":"',
traitStorage.getClothes()[traits.clothes][0],
'"}'
)
);
}
if (traits.shoes != 0) {
parts[5] = string(
abi.encodePacked(
',{"trait_type":"Shoes","value":"',
traitStorage.getShoes()[traits.shoes][0],
'"}'
)
);
}
return
string(
abi.encodePacked(
parts[0],
parts[1],
parts[2],
parts[3],
parts[4],
parts[5]
)
);
}
function _genTraitString(uint256 tokenId)
internal
view
returns (string memory)
{
Traits memory traits = genTraits(tokenId);
return
string(
abi.encodePacked(
'"attributes": [',
'{"trait_type":"Race","value":"',
traitStorage.getRace()[traits.race][0],
'"},',
'{"trait_type":"Pants","value":"',
traitStorage.getPants()[traits.pants][0],
'"}',
_genOptionalTraits(traits)
)
);
}
function _genStatsString(uint256 tokenId)
internal
view
returns (string memory)
{
Traits memory traits = genTraits(tokenId);
string[8] memory parts;
parts[0] = ',{"trait_type":"Magic","value":';
parts[1] = uintToStr(traits.magic);
parts[2] = '},{"trait_type":"Strength","value":';
parts[3] = uintToStr(traits.strength);
parts[4] = '},{"trait_type":"Intelligence","value":';
parts[5] = uintToStr(traits.intelligence);
parts[6] = '},{"trait_type":"Stamina","value":';
parts[7] = string(
abi.encodePacked(
uintToStr(traits.stamina),
'},{"trait_type":"Dexterity","value":',
uintToStr(traits.dexterity),
'},{"trait_type":"Creativity","value":',
uintToStr(traits.creativity),
"}"
)
);
return
string(
abi.encodePacked(
parts[0],
parts[1],
parts[2],
parts[3],
parts[4],
parts[5],
parts[6],
parts[7]
)
);
}
bool public CDN_ENABLED = false;
string public CDN_PREFIX = "";
// Smart contract creates inline SVG, however due to browser security
// protocols SVGs may not show up in NFT marketplaces. CDN is a back up
// Smart contract is source of truth for all traits and stats.
function enableCdn(bool value, string memory prefix) public onlyOwner {
CDN_ENABLED = value;
CDN_PREFIX = prefix;
}
function getJsonString(uint256 tokenId) public view returns (string memory) {
return
string(
abi.encodePacked(
'{"name": "Hero #',
uintToStr(tokenId),
'", "description": "',
DESCRIPTION,
'",',
'"image": "data:image/svg+xml;base64,',
Base64.encode(bytes(genSvg(tokenId))),
'",',
_genTraitString(tokenId),
_genStatsString(tokenId),
"]}"
)
);
}
function tokenURI(uint256 tokenId)
public
view
override
returns (string memory)
{
require(_exists(tokenId), "Token ID does not exist");
if (CDN_ENABLED) {
return string(abi.encodePacked(CDN_PREFIX, uintToStr(tokenId)));
}
if (tokenId >= 10000) {
return string(abi.encodePacked(_baseURI(), customs[tokenId].uriHash));
}
return
string(
abi.encodePacked(
"data:application/json;base64,",
Base64.encode(bytes(getJsonString(tokenId)))
)
);
}
function _mint(uint256 amount) internal {
for (uint256 i = 0; i < amount; i++) {
uint256 tokenId = ++currentId;
_safeMint(msg.sender, tokenId);
tokenIdToSeed[tokenId] = uint256(
keccak256(
abi.encodePacked(tokenId, blockhash(block.number - 1), msg.sender)
)
);
}
}
function mint(uint256 amount) public payable nonReentrant {
require(amount <= 10, "Can only mint up to 10");
require(currentId + amount <= MAX_SUPPLY, "Not allowed");
require(currentId < MAX_SUPPLY, "All minted");
require(amount * PRICE_PER_TOKEN == msg.value, "Invalid value");
_mint(amount);
}
uint256 merlinMinted = 0;
function merlinMint(uint256 amount) public payable onlyOwner {
require(merlinMinted + amount <= 100, "Merlin can only summon 100 heroes");
require(currentId < MAX_SUPPLY, "All minted");
merlinMinted += amount;
_mint(amount);
}
uint256 customMintId = 10000;
struct Custom {
bool exists;
string uriHash;
}
mapping(uint256 => Custom) customs;
function mintCustom(string memory tokenUriHash, address to) public onlyOwner {
customs[customMintId] = Custom({ exists: true, uriHash: tokenUriHash });
_safeMint(to, customMintId);
customMintId += 1;
}
}
library Base64 {
bytes internal constant TABLE =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/// @notice Encodes some bytes to the base64 representation
function encode(bytes memory data) internal pure returns (string memory) {
uint256 len = data.length;
if (len == 0) return "";
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((len + 2) / 3);
// Add some extra buffer at the end
bytes memory result = new bytes(encodedLen + 32);
bytes memory table = TABLE;
assembly {
let tablePtr := add(table, 1)
let resultPtr := add(result, 32)
for {
let i := 0
} lt(i, len) {
} {
i := add(i, 3)
let input := and(mload(add(data, i)), 0xffffff)
let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
out := shl(8, out)
out := add(
out,
and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF)
)
out := shl(8, out)
out := add(
out,
and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF)
)
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
out := shl(224, out)
mstore(resultPtr, out)
resultPtr := add(resultPtr, 4)
}
switch mod(len, 3)
case 1 {
mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
}
case 2 {
mstore(sub(resultPtr, 1), shl(248, 0x3d))
}
mstore(result, encodedLen)
}
return string(result);
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
contract HeroTraits2 {
function getHairLength() public pure returns (uint256) {
return getHair().length;
}
function getHair() public pure returns (string[2][109] memory) {
return [
["", ""],
["Hair 1", "QmVR4Agrosv1FUsYUL3VazA6U6iKP8TsjpnSt9i8b3rWo6"],
["Hair 2", "QmdzHAR6kvwzNtTFc4K7Si3JYu2HK7nMWjJHYqjGg8UGey"],
["Hair 3", "QmbSETVbdXvxYzfnmWqje7JhrTyzuBs78cmNtkDMjRX8UD"],
["Hair 4", "QmTq6YusqEtE49K2FskYhhhkYudXG3eycfuFEtX93CkQqt"],
["Hair 5", "QmY1MUML2xeQrjJMtGqamMaJNmbNpsYrpj7SimfgPu6kMG"],
["Hair 6", "QmSuu6bKH49g8PLdiKWAeUeZBcirVvp6FtVRa6a3AVGCD8"],
["Hair 7", "QmSfCFqsKsC5YfEfhGuvNWUfppEQtc97kEg2DaMAbk7P1T"],
["Hair 8", "QmbgFJyFvVoNV6GwH7JVmCBXUJRmth4sZA6eCHvGD9Ayst"],
["Hair 9", "QmaNm9SkL13mBbztEGEAYLhGFD9PVuVNgrNE1wEQgdnCYb"],
["Hair 10", "QmcSHYeCh3TDxLuUHZeL1bXpPzf3s1KP2zDkw74b55vgx9"],
["Hair 11", "QmVeJPSR6CxAXUyfqXxijxHxVNSVPu4bXL12C4X2tt2JpM"],
["Hair 12", "QmV94RyUbvYZZRRh9R5pzYgRf1Lfd5qy69J6qgSShYpfAB"],
["Hair 13", "QmNXikU6eU6xCkLkR3apued1gbU2r1upFk3eyWvj9jXxuZ"],
["Hair 14", "QmZTTegdX9hhnQy3HqTMpBfMzkWKdodm88hnzAij3ATqEq"],
["Hair 15", "QmaAieRfrDZVzzSUWbbNoJH4JS3hkdy2ziHQqH5LYyUrWk"],
["Hair 16", "QmQPvYaQfVZv8NJgUyyVRejeab6GAwdVzQEgznDejvsWGS"],
["Hair 17", "QmYMB68YQtgUptCuUZFUjkY8z3ACVXQLbYQ3EtjnGF9EWQ"],
["Hair 18", "QmR6HC7R3VKK9o6FUMsGDdH4QW2XRXijZxDRtt2eDQ4cfq"],
["Hair 19", "QmNT4AyAo3Wo5EnToCqGdMqeEEY27YWY2945K5LW8FyCUV"],
["Hair 20", "Qmb8skGpSyiu8qMstcpz1t58a437en8UKEysiFpqmRanCC"],
["Hair 21", "QmeGczhaEDt4XGJPU85yEqpQTu6P6uXzZ3nYkF4W9bxsxp"],
["Hair 22", "Qma3aqjuJFiezXRcJV7DmJJ4Lqx17TGuXrEu6ceRgKfs8W"],
["Hair 23", "QmTowaiJ9TYSomNVd5En1UCQfmtbMW9zxbkxi8JXHAizGu"],
["Hair 24", "QmZahpiQvGR9z5VvNtTVe8htiGPRdyiRBJs5btoMattmMx"],
["Hair 25", "QmTifJ8MF1bA1BCoSkCcWNkVEgs5rTzgcHEVJVJgN2f63q"],
["Hair 26", "QmYbqFoGv8g3CTnvYJiL9vUZCki1XjkRt1NGND1DZse9XP"],
["Hair 27", "QmUwuPGpuSqiGFz5S4SmEKNs7BVB4eUFtCbapu7UZqWMVb"],
["Hair 28", "QmegmyWNx6jxD7Hubrsyt7s8yPBavPSp9DoV87tmZUw8oM"],
["Hair 29", "QmShV3vwUjgxViYMbL8tAsei4QXE9oCT55hNeYHJPN46Hv"],
["Hair 30", "QmR8NbJzAmM4idNC63se3iz5ovCW3xQ8Qr7io86hHKEDbd"],
["Hair 31", "QmRgqEYE8KKkvbVW6L9xtZM4BTWkQqoyArQrN5PKWbj4fC"],
["Hair 32", "QmTohKmQXEYp3EGBX9ux7nJhGnm1ceUhJCFajMfSqUvUF5"],
["Hair 33", "QmWJvgkV5kGAWqoeUAwt6cuMiSdi3R52k7bs53vXnEHVNW"],
["Hair 34", "QmbLHLXW6BwnSoWdrHqLGwR9kqLSQBQLDp9cJMdyM8T7Ti"],
["Hair 35", "QmNVxTU8MpPE4xzx4DS3rBMcQ4dn65Ya1CVL7GL17HmB45"],
["Hair 36", "QmarD1Z6brfx1ABbQdejCK844D6sdCx9TV5K3sfJZVea8x"],
["Hair 37", "Qme3QWm2Z2LDorfFQ129mHfHFjhdw8HPpKphdDowmmW1t7"],
["Hair 38", "QmZGsagUe78rk3AiryQ5qoS8rH3jiEGQnQc5iSuEjCd1Ud"],
["Hair 39", "QmSfVDqsHqbQtHPUk7U7iKmybHia4dp2vxCNfjroWhkXqw"],
["Hair 40", "QmdjShCw7LiKEDpYUPW3FHpNiuepiZEAFb7otR9SCorFX5"],
["Hair 41", "QmTPv8esjqKb17fPTf3kpdEbbXcH591wzTeVFBXeKVqJCd"],
["Hair 42", "Qmd43EPyY6g6pXXDpCAxyMjtR5VHbrK7zLarTyPjd4K6Cw"],
["Hair 43", "QmYD2WyJGqe7SKwKxe5drmGhzxN6741NfGgQhX8ASBG7We"],
["Hair 44", "QmeXappknixDZ95Bw64ifeTuKYAdmLrEtu6cdsVJ395Lps"],
["Hair 45", "QmNQcRV79PHPAEue75PcjE6DuQLUeoNTEbdkKMhdvgNmT6"],
["Hair 46", "QmfKHZecgh4JsY3N7q6qf3r3C4Wj9xNYT3xRPohbX7idY5"],
["Hair 47", "QmaDTiRVmqusHowbg4ij4Yw82EVdjUe5EbFe1UDc55eEfz"],
["Hair 48", "QmWNcABFm7xRVzzbpQhfYGUbSz4mfaQkJjfaBpUnPVX9NX"],
["Hair 49", "Qmcqmq4FMXedKRZ1DmC8TBNh5nS32m3mXvXhw4pukLCrdE"],
["Hair 50", "QmaQ2LBn9feY8vzxUDXZK44cMb5mn3cxAunoFfZ6R4ANrL"],
["Hair 51", "QmfR5C4hxMDNLgySiGYnLxMfrdzunbhzfyxUGmfTr6ZqTy"],
["Hair 52", "QmUmCDgFYnm3y1xyhJg5GSeQtXqqzC11vAhgfVb5kBj4P5"],
["Hair 53", "QmdAD2f1nTuAtY4z5XzVE3xP1unRQjf1M55u4FNkv8ERWo"],
["Hair 54", "QmajUPh1zkNDy919LHi1bLaVZTbzHXv4JGZ7Try2QmhNSx"],
["Hair 55", "QmeNCwHvqrNH81gcsvSeD335iZga1fR6SCZ2avSGBfLe2N"],
["Hair 56", "QmfXU1KCRCuBf5NBAZVV9xxKndQxaGsbhfQR443XUb6VYE"],
["Hair 57", "QmZrkxM7Wc2STa3tdk4nfBq2o2JG4nvMdEnxyEUvhb2xGg"],
["Hair 58", "Qmcqes6SnpLP228UzQbEigJNVHXZzwEwkXHbrVSBXvpwZp"],
["Hair 59", "QmSgPWVS7HqhUGonuw4uxBXjP6mRKMH4SpoWbDTf5Nogre"],
["Hair 60", "QmfP9FWjgJzeivFhknACVMTyCU8Mtse7VsMZYDR6P6dmLE"],
["Hair 61", "QmPwcmqrDMHHt73MZ4Aga1EGg5KCduo7wcMRC7Hms5nyfh"],
["Hair 62", "QmbbVkDt7Y6K3pnt6m79obn61MwsoeW1NHqYgW2poAYWvz"],
["Hair 63", "QmcKATVT8NUpWRwBhuLJgFhQX1yxUeGyRhsfJtzkPGFR6W"],
["Hair 64", "QmRB2Np8aih7LfvfLFGbPu7R2X3nCerJvJgBiYzECUFguT"],
["Hair 65", "QmUAyjR8TzV53Uatwgja2WBkVqaCQ36ZMwW45Wfv7vyTKB"],
["Hair 66", "QmTcaK9nghZV6LuMBruaa7nq9WXic6W5hiC5Ech755Myx4"],
["Hair 67", "QmbipeCH6nLmqSrx12UM9FMXVjRbrVicveJbGtoqFrCQPi"],
["Hair 68", "QmTPvtSd7kykCVVd7zMy5wTKBPMWXW4a1sivzaCrG4L3yy"],
["Hair 69", "QmQ4bfdYJqiCRjK7xqZB1Jmnhr7h5ghnR11MTAUtiwcr6G"],
["Hair 70", "QmV3Wi2N78DQDXcVTBYeYwfUp8ijWe7Ce43e4JEbSSHPLV"],
["Hair 71", "QmcaFf4MN3NJ1jDFcH9n7czPSCcnQ5L86Me5FvRZxBs59E"],
["Hair 72", "QmQdTwNiEqnebVdYh5Bcepr4WwgZDLmZEVRnGLPXtexgzH"],
["Hair 73", "QmaSM75ikFySmNyA5ZGVWPjfScLycRjioTaRne8WKibBsc"],
["Hair 74", "QmNWmpyciad8YtR3KKtLssPpM1mDQYGUaA5wF5XZ3dturg"],
["Hair 75", "QmW5rJbTHRS8K1RcYDGXsMfrTwMqvbx8pVX75ZeLSWKJ5G"],
["Hair 76", "QmU2oooeZUnAUCcPUTqDLL6WeGLoGBq77Sari2kDsxfV24"],
["Hair 77", "QmTgfbD9NAfppAXGwod4XQmaD5Wc63mVSL3UXxSJrBDRU9"],
["Hair 78", "QmaimS11NaXAb3wvKtCs3BZZryvCcswAHCe6kTPD2fva87"],
["Hair 79", "QmVD1ekc7gfUuYaJ7yiEFpGRcVAD1nbBpvYQbv5wRPcuWR"],
["Hair 80", "QmSTrw4zyrRjt8kdpaPRHV5qeyvm6qDAtZz7qqBD8Cxi1v"],
["Hair 81", "QmfZ7LkgjARn6H7JV5pS4iPTjXcxwP5NmmWviCq4oMpXfk"],
["Hair 82", "QmbFu7FMm9u3ic7nZQp2SDRUALFnKudLZyXk3hjsTiRtCL"],
["Hair 83", "QmbAF7TdKvoWYkNQsL1TKxmih3yArVUH4ubyEiCCvcJaWr"],
["Hair 84", "QmR9n4981fVdQ4K7m8HJbB9pdxP2q8PmoWABDpe684grP3"],
["Hair 85", "QmTPbfaPAgyTdX1ppo8frxGBN4CQrs5WjFuLtMVKTsYZ84"],
["Hair 86", "QmYcyYG2TeHbDGGK5PMPyV61ye5SbnaMoAkvfqNBc9GCox"],
["Hair 87", "QmP4ZXYa7g9ZmHuVh5w9iQWp7m9Vm2uVsni1VZNmva16ca"],
["Hair 88", "QmedG9KE12FePh4TGbFEecCws3PubmoWDqVVW7GeyP439B"],
["Hair 89", "Qmb8KJnrfM3SFZyXd7ZXCZVrcweohcXLpRmomZgQ7uxvx4"],
["Hair 90", "Qmc1593Mkjhs9dxYw8Z4bH63QZ1jXEtmsuj4ugxnP2DKS2"],
["Hair 91", "QmeQ7HfbfQRFManSHa49AvXyVFv8Z4uRwN3n85FedbbKiF"],
["Hair 92", "QmTBbq66ufbjo4RQ5kM18AHkjK9fbXnX1UcAwFijUSGHYn"],
["Hair 93", "QmRocj4DoqMzdaGFrosD8Gjf42oH227GZgpCQFFyubQCRL"],
["Hair 94", "QmUoEZdnsm8tDHmEMrE2TzoNbkbsMX5JpXx9mVNLupz5hv"],
["Hair 95", "QmRBST9zT92eDLCY9qDWrFquRoY3gjPKs1vqcZA9u6xCKq"],
["Hair 96", "QmZEoxDe67kN34LxWQnHKBhHDkXuWj3ZCoPugLwXjqyyJo"],
["Hair 97", "QmWf1fL3uuFPAGTjy6uyKUjt88yFBLZvMwapXwcGi39bJR"],
["Hair 98", "QmTUeMeKB8HFRc7QhUq1sWb851H7Ru3c614M31XuUDzr9Y"],
["Hair 99", "QmTfXVdNcWwFBL6dzzgH6APpaUD8L7P5fFkHRWtJaVJRad"],
["Hair 100", "QmNxdDQ8oQ3kiFwmkY5zx1j14MmuGr4KrN9UoCH8PM227q"],
["Hair 101", "QmVP865PD44yX6NjRXtMLqmWP634fzgWYdDRRU4mrPvFHn"],
["Hair 102", "QmVi8pzkHqjgYXgkkvL3qXjNvP1BmH7UTyP1CAt2P5PP1N"],
["Hair 103", "QmPPGbaDeetLKc1QFXRNXP8WVSazyniSMZM2Dyhqp9mZgK"],
["Hair 104", "QmY5iQcSzG8cChzVbVNWPRzcK1ETXbP7heSSfwEdHmn3CX"],
["Hair 105", "QmddMPzse52GK7wh3BWAkpA5BmXxVA2rkzBV27RNAqRLQ5"],
["Hair 106", "QmP1KfmDzDaSFkQ7Pw4ZkWLhjmgzN4w8W5SznP3SC4WgFb"],
["Hair 107", "QmVd8UUu2ApmjxeTkt672nf5vdoojTfjmJw77rfgXF9moh"],
["Hair 108", "QmdDtkeqd2dMLFtwFAK6Yq4johr8SyY1MLc61VhD9FwduJ"]
];
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
contract HeroTraits {
function getPantsLength() public pure returns (uint256) {
return getPants().length;
}
function getPants() public pure returns (string[2][5] memory) {
return [
["White Pants", "QmS1ugwVyGemvvcu8xhvYPLJcM9XiCzev19hL5S4118mvY"],
["Red Pants", "QmQRw479rzessc1ms2kcnKQCvCs2aQ1Ep25vK7xgo9cEJt"],
["Blue Pants", "QmePEJz87mRjQt9BmYib14Fcxn8j13Xkdj6MfYoUZbQi79"],
["Green Pants", "QmZ6sjTg936aJCM67NPsPcCjMphAYEWoyQXHNHduKzLyf7"],
["Purple Pants", "QmPP9edeKhcJAM2YKxVfJhLaFHmLxJLm3WGcwWBvNvGXkZ"]
];
}
function getWeaponsLength() public pure returns (uint256) {
return getWeapons().length;
}
function getWeapons() public pure returns (string[2][19] memory) {
return [
["", ""],
["Boomerang of Wood", "QmeZpiK4w2G4nQnEsm9m83h1oZXSaxX5P9tg1ai7cEzCvc"],
["Bow of Focus", "QmNSq5KzbDhRJNuFkUmLc3MZBe5fcVKbvQcNSfThsG4KXw"],
["Mythal Short Sword", "Qmbbz8kkycoEK4r3oMUyw3aqrTQbCfdTno9i9eCKfFTCmz"],
["Bow of Honor", "QmNMApPhGawYMQtCsVNbkD2tSsyA7wfHeNuspw8jSrFaBL"],
["Axe of Honor", "QmeLEVz3Jy2FhWRBrQqN8szyUhYtjFxDPGVHxnTJY1xd2h"],
["Wood Long Sword", "QmXnwjgest5CZVz5ZhUyNnLo1diWFhkKhBck98xY4cpvRP"],
["Boomerang of Flight", "QmPeNnTj25uXJz67mFrJr4ro1zxENYXAGX6kfSxAC9GBxs"],
["Axe of Wonder", "QmT32TRmyg1xJCA9n7oFBRcuRW5vbb5TboXh5LygyLTXbi"],
["Bow of Mystery", "QmbQLEKE1QbGnqNjKeBLLVwcDEoQNB98fsoEQgUbVgrPJk"],
["Axe of Strength", "QmRfhpxsSQHCmsxGPbSDAD7rTKAjVfqgHVBfdoVZBALWFC"],
[
"Elvish Staff of the Forest",
"QmZTTFEmaGu54yj9kUwH3xL4mZrfXJXp8RtzqYMHMYww6p"
],
["Staff of the Sea", "QmUsxTdawFhmWPEbBwqRUi9SGpNBeUN8RwxUUQczxVP8TX"],
["Universe Staff", "Qmab3zQ2n1ZPYpTEgkivDHuryM6A5P1sTjCQoWN5N9ADWE"],
["Mythal Long Sword", "QmSx6MiY29hFoYV2pnehEdbmuFipwupz2y2DJZyCN54jdZ"],
["Wood Short Sword", "QmWFFLygzSa9UXNJAtthRAurazVXjhfZ1ZsDAAsFrKWSQm"],
["Boomerang of Focus", "QmXPDw8pxgnsFsGoz4bw7cWA2G1ZK1MDXArNKHr1VPv3GQ"],
["Iron Short Sword", "QmTqDh8schE195bh6HSsoPfYLVYZLRrXaRen92nJfZcFDC"],
["Iron Long Sword", "QmfYEHBEReGSDKWZuRUBMRiHGhiBo1jTFwpWnVaAG11saw"]
];
}
function getBgLength() public pure returns (uint256) {
return getBg().length;
}
function getBg() public pure returns (string[26] memory) {
return [
"#FEDD00",
"#74D1EA",
"#9DE7D7",
"#9E978E",
"#84754E",
"#00B08B",
"#222223",
"#6B4C4C",
"#ff2424",
"#FF808B",
"#DF1995",
"#C1A7E2",
"#685BC7",
"#DDDAE8",
"#1B365D",
"#A4BCC2",
"#407EC9",
"#009CDE",
"#003865",
"#40C1AC",
"#279989",
"#00BFB3",
"#006F62",
"#ADDC91",
"#007041",
"#58eb34"
];
}
function getRaceLength() public pure returns (uint256) {
return getRace().length;
}
function getRace() public pure returns (string[2][22] memory) {
return [
["Human", "QmbVrpTTEciNQPxb8TjntcmpQMDLrzgEsJxYrpGanCmH88"],
["Human", "QmWTzCYevtrCY9Yu9HZ1RudJ5DZ3ySMbbb6V8j1GMoFd2W"],
["Human", "QmYhchiEeh4iJPYSksxoUAoy9SZCCEU21UQzEyeFxWBcBj"],
["Undead", "QmTtNfnd3HZ7moKrzaJaYyUM5idGbKy2sgHE14fpeyU9UL"],
["Skeleton", "QmcMDNnc8SNjwvPBpcb6hXG3yjz9WSiQ5qzbJTZre7N2uB"],
["Wizard", "QmYotarEMJ98MHfZGDKhsgCcZU54EzTRPCuS88vG9PBUtd"],
["Ghost", "QmTuv44nHYMAix3L36HuBkPV5sQ6NPiGhxSFGSTnAHipJk"],
["Frogling", "QmPXTBPcjrxrjwAaH9VaLzV8uZVpHuy2VnytHT1LWsYWuX"],
["Pizza", "QmaJFAM6iV473UUcEQUPP7hCtP1Zh5jspvMHb9sJYiyutJ"],
["Slate Monkey", "QmNZezfUXKEQZkrXfobHsudcqqAECt97yYZQRUV12jkNbj"],
["Emerald Monkey", "Qmdy1tBPBa85TeDMYb9KVPHanU7Wor39yLEpAJwEUDfgK8"],
["Red Monkey", "Qmb23Pp17Xg5nBQJnfkzQ4rMWPKYnNNWqJcYDaDoJJnwSN"],
["Gold Slate Monkey", "QmNn3agjVqz4WFNvcm3Srzg2EuKJoJi2W2t32E1aDVhAwg"],
["White Monkey", "QmTH9fLyHLzbP6KXUFdJKCKYZqPUHEv7vrYeP95s8AZ57B"],
["Emerald Red Monkey", "QmZJQQE2QS9kMHhUe1PbCNnG1QvGH7hiW6sPETZtqpeEZK"],
["Yellow Monkey", "QmRdNLRMzuTmEuQZVtJAXj9ydxs3Ztb1EdCcF8eqRFQBBe"],
["Honey Monkey", "QmbgrRnunnkJSS9L945bvbP9gd54nRJ8D6YMi1jECvHhei"],
["Red Furred Monkey", "QmdHwSAhmthUbTUfSTqD7EMFWcZ13LLZbvoNTYgKjJb5Vj"],
["Snow Monkey", "QmYvjKEGeSZH2dMhSvgooPt5AatSZzQm2UvMBNhoKvUvER"],
["Brown Monkey", "QmehwhevsQdDyAoG2maHFA7Pip4x6KLVRU1KVfmV4pfDmu"],
["Gold Monkey", "QmTsvwBm7MTRgZBhLmV2GFtC7FzBggwcNNWDmk5iNyk2oP"],
["Tree Monkey", "QmYJBTHYE8WjNFV2udVre3yXTy9Y5xwScBW4bgHvaoPL5r"]
];
}
function getClothesLength() public pure returns (uint256) {
return getClothes().length;
}
function getClothes() public pure returns (string[2][25] memory) {
return [
["", ""],
["Robe of Fire", "QmUH91Yysb2SsDNKZSrkUMevUcoSU3dmcvpcozWAuEvr18"],
["Shirt of Mystery", "QmXRYw9yfgDYAU27KMQafT41hKQFVGJZBqwjs3nkWEUpAp"],
["Vest of Fire", "QmZDeqtzajKwxV9YgfzcZ8Wfap1zARUicUWjTJmJBMdQdw"],
["Tunic of Wonder", "QmaS95LAjXoF3EWxPowwbybBvhG7NtqAA6KeWLYpAzKUVZ"],
["Tunic of Mystery", "QmYJ1xzvptgSVakpUGQgaXjF4w8nnZyNCoDz9v9TJKEcpz"],
["Shirt of Fire", "QmQc1ThSSgbdC6z5nwLDyMyPYqrUC6JBDhfu7WWkyyx9QP"],
["Vest of White", "QmYXx2ihhkFWbjHGkyyfSsQf5jnHPojmo1cWBS9RNjLo8R"],
["Tunic of Fire", "QmcfVUUiFDNoJnZP8W8eSHPq11WRj99oeK4LLaJQtQ1fb8"],
["Robe of Mystery", "QmW9xSXtHfikeScmhpB56kWHdNSDPJaA2F4DRiRdS1gt96"],
["Robe of White", "QmRdTAV3jspvFCdWuTL1wYvz34BS1BXhUY9ctsouy11vfR"],
["Shirt of Emerald", "QmU3i6M3JgPUSFMzfwCjgAkcFtwtmEvwgdSvTEN9gBQ2Ld"],
["Vest of Mystery", "Qme5ZavY4PMvt5bSmrLJErrnDyUckaNH9FrgT5aYqdnnBf"],
["Robe of Emerald", "QmZynRUwPjL6Du9LsGyPA3u1fYabmKuefjRnyTgAm99S8D"],
["Vest of Wishing", "QmUWNR2XF8dAgPXyakxUmpbr5SWz3kytzu49dAhRBo3gLZ"],
["Gown of Magic", "QmQBvcfZ1tsue32nerkpRCsYzDJfNpy466zAhwZ7jWENLw"],
["Robe of Wonder", "Qmbidcgmae5LJqcQKoVwF1832maJ7nMdScNr79hkvMtkkd"],
[
"Gown of the Universe",
"Qmehwi2m5aqrZcqUxBjeJbXRcfWjErxywu3HbwXKPZXa2p"
],
["Tunic of Light", "QmQvhTVqSFRo4zm8uye1f6tYUSUoNvksdgrDzKychyDTKR"],
["Snow Gown", "QmZRoMDJFGr7umyFhH6KBporsrqG7mS1d65xMtzcTHipLj"],
["Blue Vest", "QmXnYYxyexqF7qcYkPDhzrrzbLkwSTeHEDfwobQLvwMd75"],
["Gown of Flowers", "QmaG7srwBaMSUBsExqhUuAUtQbKG12qjcmT1KKoihk7n34"],
["White Shirt", "Qmb7iqzgFA3NcJJQutWYFgT946bcy5JwfGHevzc9TFFXt1"],
["Blue Shirt", "QmQosecPGEQ8qhP1AvPNrphzrga8f3jkpNvB7HPku49cej"],
["Tunic of Emerald", "Qmb6yH7Ss23kL75LfrJTGZXb4oNTXx8A9Uhdr18txKFbqQ"]
];
}
function getHeadLength() public pure returns (uint256) {
return getHead().length;
}
function getHead() public pure returns (string[2][24] memory) {
return [
["", ""],
["Dark Hood", "QmecUFzdxqbhzQGQzpoxqWViFXybMA4amKC9vcwddEzj3y"],
["Emerald Hood", "QmQR7CLWNY66kicK51cPjzpf7tcZVEVjZm8PhMtHjBJthi"],
["Blue Hood", "QmUEhNvJQ5PmPWvJfABNJ5mwZg9s9uANgeFh8wBfwnftk1"],
["White Hood", "QmSNTEq8GsBkzRq19T3Rh9jdULr46KCtKJxVEKTgUQajAo"],
["Red Hood", "Qmc4VPaLnV1JPUvpzsYxsKaYofaCbrhgKK3TaDcnf6tW3L"],
["Helmet 1", "QmcuWWeEsqWMh6ESKEi4BpbicnoqpQt5WQcLhqC9kggj2M"],
["Phrygian Cap", "QmRYZTTanct9LqJw6Mr4EjuTN5iGvySnbgB3GAviy9QAaX"],
["Reddish Hat", "QmemYuaZ6ti3f9hZB6sMnCZ9CyHnPRsBCTsSBrTGp7jgFS"],
["Hat of Luck", "Qmed5Ebw2HqfeDBn845Sb6UJdSFeedZvwcF2eDeDVTt5Q8"],
["Purple Hat", "QmTaet5S2Q8tRa6fa4REPQ3USdn7G6Ptemm4nMb3BpLhZ5"],
["Wizard Hat", "QmTAoe4qpfHsER7swyzbGj1zSR6GuRTsMfBaWdWQtsVUAu"],
["Helmet 2", "QmQd9zjzVbCEG3HTsnLSjfj4D8g2YbVAwJD9jLnf6x3SqH"],
["Helmet of Nebulous", "QmWEvHZyBXuezBcAFKvM55MdVWDnqQCXQXL4xDUzPCVYY6"],
["Helmet of Valoria", "QmZX3jJVEhJNTtQM5mTJNkfCSZxqfULsZ88bHg1ekELiGT"],
["Hat of White", "Qma6pcKWCwCbLdQfbLqYA8vNr8jr74uTM2dNiK5Ga6GSQL"],
["Helmet of Thulium", "QmWWFXsfSuSNRTN4qVdjPH9cf6bccZ3mUbJz8MXXY7Ky8n"],
["Helmet of Wonder", "QmNQQ9rZUscy6fLHdhqndmDm43dSe1xo45JBqkiKNN95qz"],
["Helmet of Valoria 2", "Qmd1Xza7bLMXNdHmpCP2Dt2Fo7YkyECnQxnsbNgPPEkipK"],
["Beep Bop", "QmaPxQGtBVHp7HWDmc7hjnHXCWbubNHFb3dctqetfT5S8S"],
["Helmet of Power", "Qmaqi98rt2oFwzjwJxbWmVgdbrjQshCPt5cCpmLUHsM9Cn"],
["Beep Bop 2", "QmTNiTTa7BZdAHNni9AgVdcQ86GNkDrDcmreLRRCVHnE4V"],
["Beep Bop 3", "QmXnP7hifqudavHmH92o9eDATz8qvpZef7CtGZDdgi5Hoz"],
["Helmet of the Sea", "QmXQBQtsdaM5CNC84r3LvjqsQPcBWnmsKvP2U1SdnGdHph"]
];
}
function getShoesLength() public pure returns (uint256) {
return getShoes().length;
}
function getShoes() public pure returns (string[2][5] memory) {
return [
["", ""],
["Shoes", "QmZuWKcMRRRP28eCFq7oZ19VHp5fKsHfKeLPvRh9AhQw3G"],
["Golden Runners", "QmSBkmnuG4N8GXMRhAMyYEqoajApFwHymt1aPcDaQXoiX8"],
["Blue Shoes", "QmXrspeWB4J3kSYovtuGCz6FqAs5KgxpZs13obSUoSBW3D"],
["Blue Boots", "QmZVtB16f6Z8MgEzkv2XCE9ayFe34tTRwouRPKbVZiNjF1"]
];
}
function getShieldsLength() public pure returns (uint256) {
return getShields().length;
}
function getShadow() public pure returns (string memory) {
return "QmcRNVeYU1CeMe2yD1HKpg5bvBQCfcW5xZp67HYSstAzSZ";
}
function getShields() public pure returns (string[2][11] memory) {
return [
["", ""],
[
"Shield of the Forest 1",
"QmVSwjgTzn7w9jYFvmzadBmFYDaTFi5H9JK8hUW5EJ6Uq3"
],
["Shield of Iron 1", "QmZWnaVywirur14yBBGfBJdQiqit6rQwB5NUAzkdJzqnPS"],
["Mythal Shield 2", "QmebyDHQq24xgLEjoN33aSSQUCFX3vTpf9koRo62GCB6bM"],
["Mythal Shield 3", "QmbVKssPYZS1V9bZmkDfpU1EqKyFSKkVLunqQasiipQCkD"],
["Shield of Iron 2", "QmYpmqDQZvPPQoNsiH4jDUksozTgWiK13KfWT24YorFsY7"],
["Mythal Shield 1", "QmT21FSftCYKcSvjK262vyw79zqQpzxuPCvPNKY23CbNzn"],
["Shield of Absolute", "QmPGtk89gzqK93hV8v1noqJthoB3QAccxZGVw9TZUKrKmZ"],
[
"Shield of the Forest 2",
"QmcDwGHTrcdFusDAagX3632cDjAczawoWL6uChv4Y68gF2"
],
["Shield of Iron 3", "QmPvccz4cMBh3589fht4hCdwRJYyNAHMRggy4YUwKzGKv4"],
[
"Shield of the Forest 3",
"QmRPvKjbSQafzLcxwU4CFBKuemNRxGBS8U3ra8rGFJRRGy"
]
];
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts 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/cryptography/ECDSA.sol)
pragma solidity ^0.8.0;
import "../Strings.sol";
/**
* @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
*
* These functions can be used to verify that a message was signed by the holder
* of the private keys of a given address.
*/
library ECDSA {
enum RecoverError {
NoError,
InvalidSignature,
InvalidSignatureLength,
InvalidSignatureS,
InvalidSignatureV
}
function _throwError(RecoverError error) private pure {
if (error == RecoverError.NoError) {
return; // no error: do nothing
} else if (error == RecoverError.InvalidSignature) {
revert("ECDSA: invalid signature");
} else if (error == RecoverError.InvalidSignatureLength) {
revert("ECDSA: invalid signature length");
} else if (error == RecoverError.InvalidSignatureS) {
revert("ECDSA: invalid signature 's' value");
} else if (error == RecoverError.InvalidSignatureV) {
revert("ECDSA: invalid signature 'v' value");
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature` or error string. This address can then be used for verification purposes.
*
* The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {toEthSignedMessageHash} on it.
*
* Documentation for signature generation:
* - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
* - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
*
* _Available since v4.3._
*/
function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
// Check the signature length
// - case 65: r,s,v signature (standard)
// - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return tryRecover(hash, v, r, s);
} else if (signature.length == 64) {
bytes32 r;
bytes32 vs;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
assembly {
r := mload(add(signature, 0x20))
vs := mload(add(signature, 0x40))
}
return tryRecover(hash, r, vs);
} else {
return (address(0), RecoverError.InvalidSignatureLength);
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature`. This address can then be used for verification purposes.
*
* The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {toEthSignedMessageHash} on it.
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, signature);
_throwError(error);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
*
* See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
*
* _Available since v4.3._
*/
function tryRecover(
bytes32 hash,
bytes32 r,
bytes32 vs
) internal pure returns (address, RecoverError) {
bytes32 s;
uint8 v;
assembly {
s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
v := add(shr(255, vs), 27)
}
return tryRecover(hash, v, r, s);
}
/**
* @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
*
* _Available since v4.2._
*/
function recover(
bytes32 hash,
bytes32 r,
bytes32 vs
) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, r, vs);
_throwError(error);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `v`,
* `r` and `s` signature fields separately.
*
* _Available since v4.3._
*/
function tryRecover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address, RecoverError) {
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
return (address(0), RecoverError.InvalidSignatureS);
}
if (v != 27 && v != 28) {
return (address(0), RecoverError.InvalidSignatureV);
}
// If the signature is valid (and not malleable), return the signer address
address signer = ecrecover(hash, v, r, s);
if (signer == address(0)) {
return (address(0), RecoverError.InvalidSignature);
}
return (signer, RecoverError.NoError);
}
/**
* @dev Overload of {ECDSA-recover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function recover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, v, r, s);
_throwError(error);
return recovered;
}
/**
* @dev Returns an Ethereum Signed Message, created from a `hash`. This
* produces hash corresponding to the one signed with the
* https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
* JSON-RPC method as part of EIP-191.
*
* See {recover}.
*/
function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
// 32 is the length in bytes of hash,
// enforced by the type signature above
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
}
/**
* @dev Returns an Ethereum Signed Message, created from `s`. This
* produces hash corresponding to the one signed with the
* https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
* JSON-RPC method as part of EIP-191.
*
* See {recover}.
*/
function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
}
/**
* @dev Returns an Ethereum Signed Typed Data, created from a
* `domainSeparator` and a `structHash`. This produces hash corresponding
* to the one signed with the
* https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
* JSON-RPC method as part of EIP-712.
*
* See {recover}.
*/
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/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/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/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 (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 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "./IERC721Enumerable.sol";
/**
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds
* enumerability of all the token ids in the contract as well as all token ids owned by each
* account.
*/
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
return _ownedTokens[owner][index];
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
return _allTokens[index];
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual override {
super._beforeTokenTransfer(from, to, tokenId);
if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}
// 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/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/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 (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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);
}
}