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Transit NFT Meelons

Transit NFT Meelons

Meelons

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此合同的源代码已经过验证!
合同元数据
编译器
0.8.0+commit.c7dfd78e
语言
Solidity
合同源代码
文件 1 的 11:Address.sol
pragma solidity ^0.8.0;

library Address {

    function isContract(address account) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    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");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    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");
    }

    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);
    }

    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    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);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    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);
    }

    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);
            }
        }
    }
}
合同源代码
文件 2 的 11:Context.sol
pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
合同源代码
文件 3 的 11:ERC165.sol
pragma solidity ^0.8.0;

import "./IERC165.sol";

abstract contract ERC165 is IERC165 {
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
合同源代码
文件 4 的 11:ERC721.sol
pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165.sol";

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;

    string private _base_URI;

    // 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;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function initBaseUri(string memory uri) internal {
        _base_URI = uri;
    }

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function balanceOf(address owner) public view virtual override returns (uint256) {
        return _balances[owner];
    }

    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        return owner;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "Meelon: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString(), ".json")) : "";
    }

    function _baseURI() internal view virtual returns (string memory) {
        return _base_URI;
    }

    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "Meelon: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "Meelon: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "Meelon: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "Meelon: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "Meelon: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "Meelon: transfer to non ERC721Receiver implementer");
    }

    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "Meelon: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "Meelon: transfer to non ERC721Receiver implementer"
        );
    }

    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "Meelon: mint to the zero address");
        require(!_exists(tokenId), "Meelon: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    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);
    }

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "Meelon: transfer of token that is not own");
        require(to != address(0), "Meelon: 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);
    }

    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "Meelon: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    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("Meelon: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}
合同源代码
文件 5 的 11:IERC165.sol
pragma solidity ^0.8.0;

interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
合同源代码
文件 6 的 11:IERC721.sol
pragma solidity ^0.8.0;

import "./IERC165.sol";

interface IERC721 is IERC165 {

    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    
    function balanceOf(address owner) external view returns (uint256 balance);
    
    function ownerOf(uint256 tokenId) external view returns (address owner);
    
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    function transferFrom(address from, address to, uint256 tokenId) external;

    function approve(address to, uint256 tokenId) external;

    function getApproved(uint256 tokenId) external view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) external;

    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
合同源代码
文件 7 的 11:IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;

import "./IERC721.sol";

interface IERC721Metadata is IERC721 {

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function tokenURI(uint256 tokenId) external view returns (string memory);
}
合同源代码
文件 8 的 11:IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;

interface IERC721Receiver {

    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
合同源代码
文件 9 的 11:InitializableOwnable.sol
pragma solidity >= 0.6.9;
pragma experimental ABIEncoderV2;

contract InitializableOwnable {
    address public _OWNER_;
    address public _NEW_OWNER_;
    bool internal _INITIALIZED_;

    // ============ Events ============

    event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    // ============ Modifiers ============

    modifier notInitialized() {
        require(!_INITIALIZED_, "TRANSIT_INITIALIZED");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _OWNER_, "NOT_OWNER");
        _;
    }

    // ============ Functions ============

    function initOwner(address newOwner) public notInitialized {
        _INITIALIZED_ = true;
        _OWNER_ = newOwner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        emit OwnershipTransferPrepared(_OWNER_, newOwner);
        _NEW_OWNER_ = newOwner;
    }

    function claimOwnership() public {
        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
        _OWNER_ = _NEW_OWNER_;
        _NEW_OWNER_ = address(0);
    }
}
合同源代码
文件 10 的 11:Meelons.sol
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import "./ERC721.sol";
import "./InitializableOwnable.sol";
import "./Address.sol";

contract Meelons is ERC721, InitializableOwnable {
    using Address for address;

    uint256 private _totalSupply = 10000;
    uint256 private _mintCount;
    uint256 private startFrom = 1;
    uint256 private startTime;
    uint256 private tokenSum;
    mapping(uint256 => uint256) private tokenMatrix;

    mapping(address => mapping(uint => bool)) private is_minted;
    mapping(uint => bytes32) private merkle_root;
    mapping(uint => uint) private white_number;
    mapping(uint => uint) private white_minted;

    event MintMeelon(address indexed owner, uint256 tokenId);

    constructor(string memory uri, uint start_time) public ERC721("Transit NFT Meelons", "Meelons") {
        initOwner(msg.sender);
        initBaseUri(uri);
        startTime = start_time;
    }

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function queryRoot(uint whichRoot) public view returns (bytes32) {
        return merkle_root[whichRoot];
    }

    function queryMinted(uint whichList, address account) public view returns (bool) {
        return is_minted[account][whichList];
    }

    function queryListMinted(uint whichList) public view returns (uint, uint) {
        uint totalNumber = white_number[whichList];
        uint minted = white_minted[whichList];
        return (totalNumber, minted);
    }

    function queryStartMint() public view returns (bool) {
        return startTime <= block.timestamp && startTime != 0;
    }

    function queryMintAllow(address account, uint[] memory whichList) public view returns (bool[] memory result) {
        uint256 len = whichList.length;
        result = new bool[](len);
        for (uint i; i < len; i++) {
            result[i] = !is_minted[account][whichList[i]] && white_minted[whichList[i]] < white_number[whichList[i]];
        }
    }

    function setRoot(bytes32[] memory root, uint[] memory whichRoot) public onlyOwner() {
        require(root.length == whichRoot.length, "Invaild data!");
        for (uint i; i < whichRoot.length; i++) {
            merkle_root[whichRoot[i]] = root[i];
        } 
    }

    function setWhiteNumber(uint[] memory whichList, uint[] memory number) public onlyOwner() {
        require(whichList.length == number.length, "Invaild data!");
        for (uint i; i < number.length; i++) {
            white_number[whichList[i]] = number[i];
        } 
    }

    function mintMeelon(bytes32[][] memory proof, uint[] memory whichRoot) public returns (uint256 tokenId) {
        require(!msg.sender.isContract(), "Not allow contract to mint!");
        require(_mintCount <= _totalSupply, "Mint overflow!");
        require(startTime <= block.timestamp && startTime != 0, "Non start mint!");
        uint len = proof.length;
        require(len == whichRoot.length, "Invaild data!");
        for (uint i; i < len; i++) {
            if (white_minted[whichRoot[i]] >= white_number[whichRoot[i]]) {
                continue;
            }
            require(!is_minted[msg.sender][whichRoot[i]], "Already minted!");
            require(verify(merkle_root[whichRoot[i]], proof[i], msg.sender), "Non-whitelist!");
            tokenId = nextToken();
            _safeMint(msg.sender, tokenId);
            white_minted[whichRoot[i]] = white_minted[whichRoot[i]] + 1;
            is_minted[msg.sender][whichRoot[i]] = true;
            emit MintMeelon(msg.sender, tokenId);
        }
    }

    function verify(bytes32 root, bytes32[] memory proof, address account) public view returns (bool) {
        bytes32 computedHash = keccak256(abi.encodePacked(account));
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        return computedHash == root;
    }

    function nextToken() internal returns (uint256) {
        uint256 maxIndex = _totalSupply - _mintCount;
        uint256 random = uint256(keccak256(
            abi.encodePacked(
                block.timestamp,
                tokenSum,
                block.coinbase,
                msg.sender,
                block.difficulty,
                block.coinbase.balance,
                block.gaslimit
            )
        )) % maxIndex;
        uint256 value = 0;
        if (tokenMatrix[random] == 0) {
            value = random;
        } else {
            value = tokenMatrix[random];
        }
        if (tokenMatrix[maxIndex - 1] == 0) {
            tokenMatrix[random] = maxIndex - 1;
        } else {
            tokenMatrix[random] = tokenMatrix[maxIndex - 1];
        }
        tokenSum = tokenSum + value + startFrom;
        _mintCount = _mintCount + 1;
        return value + startFrom;
    }

}
合同源代码
文件 11 的 11:Strings.sol
pragma solidity ^0.8.0;

library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    function toString(uint256 value) internal pure returns (string memory) {
        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);
    }

    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);
    }

    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);
    }
}
设置
{
  "compilationTarget": {
    "Meelons.sol": "Meelons"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}
ABI
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