如何使用Create2工厂创建合约并验证（Base Remix）?
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- 更新于 2023-06-19 16:02
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使用Create2工厂(0x0000000000ffe8b47b3e2130213b802212439497)创建合约并在etherscan验证
0x0000000000FFe8B47B3e2130213B802212439497 ：Create2 Factory
1. safeCreate2
// initializationCode = creationCode + abi.encode(constructor.parameter)
function safeCreate2(
bytes32 salt,
bytes calldata initializationCode
) external payable containsCaller(salt) returns (address deploymentAddress) {}2. Demo contract
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract CNYT is ERC20, Pausable, Ownable {
constructor() ERC20("CNYT", "CNYT") {
_mint(tx.origin, 100000000 * 10**decimals());
_transferOwnership(tx.origin);
}
function pause() public onlyOwner {
_pause();
}
function unpause() public onlyOwner {
_unpause();
}
function mint(address to, uint256 amount) public onlyOwner {
_mint(to, amount);
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal override whenNotPaused {
super._beforeTokenTransfer(from, to, amount);
}
function decimals() public view virtual override returns (uint8) {
return 6;
}
}
Bytecode: 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3. 使用ethers.js 暴力计算 合约地址
const { ethers, utils } = require("ethers");
main();
function main() {
let from = "0x0000000000ffe8b47b3e2130213b802212439497";
let salt =
"0x0000000000000000000000000000000000000000000000000000000000000001";
let initCode =
"0x60806040523480156200001157600080fd5b5060408051808201825260048082526310d3965560e21b60208084018290528451808601909552918452908301529060036200004e8382620002f3565b5060046200005d8282620002f3565b50506005805460ff19169055506200007533620000af565b6200009e32620000886006600a620004d4565b62000098906305f5e100620004ec565b62000109565b620000a932620000af565b6200051c565b600580546001600160a01b03838116610100818102610100600160a81b031985161790945560405193909204169182907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e090600090a35050565b6001600160a01b038216620001655760405162461bcd60e51b815260206004820152601f60248201527f45524332303a206d696e7420746f20746865207a65726f20616464726573730060448201526064015b60405180910390fd5b6200017360008383620001de565b806002600082825462000187919062000506565b90915550506001600160a01b038216600081815260208181526040808320805486019055518481527fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef910160405180910390a35050565b620001e862000205565b620002008383836200020060201b620004fe1760201c565b505050565b60055460ff16156200024d5760405162461bcd60e51b815260206004820152601060248201526f14185d5cd8589b194e881c185d5cd95960821b60448201526064016200015c565b565b634e487b7160e01b600052604160045260246000fd5b600181811c908216806200027a57607f821691505b6020821081036200029b57634e487b7160e01b600052602260045260246000fd5b50919050565b601f8211156200020057600081815260208120601f850160051c81016020861015620002ca5750805b601f850160051c820191505b81811015620002eb57828155600101620002d6565b505050505050565b81516001600160401b038111156200030f576200030f6200024f565b620003278162000320845462000265565b84620002a1565b602080601f8311600181146200035f5760008415620003465750858301515b600019600386901b1c1916600185901b178555620002eb565b600085815260208120601f198616915b8281101562000390578886015182559484019460019091019084016200036f565b5085821015620003af5787850151600019600388901b60f8161c191681555b5050505050600190811b01905550565b634e487b7160e01b600052601160045260246000fd5b600181815b8085111562000416578160001904821115620003fa57620003fa620003bf565b808516156200040857918102915b93841c9390800290620003da565b509250929050565b6000826200042f57506001620004ce565b816200043e57506000620004ce565b8160018114620004575760028114620004625762000482565b6001915050620004ce565b60ff841115620004765762000476620003bf565b50506001821b620004ce565b5060208310610133831016604e8410600b8410161715620004a7575081810a620004ce565b620004b38383620003d5565b8060001904821115620004ca57620004ca620003bf565b0290505b92915050565b6000620004e560ff8416836200041e565b9392505050565b8082028115828204841417620004ce57620004ce620003bf565b80820180821115620004ce57620004ce620003bf565b610cb1806200052c6000396000f3fe608060405234801561001057600080fd5b50600436106101165760003560e01c806370a08231116100a257806395d89b411161007157806395d89b411461022d578063a457c2d714610235578063a9059cbb14610248578063dd62ed3e1461025b578063f2fde38b1461026e57600080fd5b806370a08231146101cb578063715018a6146101f45780638456cb59146101fc5780638da5cb5b1461020457600080fd5b8063313ce567116100e9578063313ce5671461018157806339509351146101905780633f4ba83a146101a357806340c10f19146101ad5780635c975abb146101c057600080fd5b806306fdde031461011b578063095ea7b31461013957806318160ddd1461015c57806323b872dd1461016e575b600080fd5b610123610281565b6040516101309190610afb565b60405180910390f35b61014c610147366004610b65565b610313565b6040519015158152602001610130565b6002545b604051908152602001610130565b61014c61017c366004610b8f565b61032d565b60405160068152602001610130565b61014c61019e366004610b65565b610351565b6101ab610373565b005b6101ab6101bb366004610b65565b610385565b60055460ff1661014c565b6101606101d9366004610bcb565b6001600160a01b031660009081526020819052604090205490565b6101ab61039b565b6101ab6103ad565b60055461010090046001600160a01b03166040516001600160a01b039091168152602001610130565b6101236103bd565b61014c610243366004610b65565b6103cc565b61014c610256366004610b65565b61044c565b610160610269366004610bed565b61045a565b6101ab61027c366004610bcb565b610485565b60606003805461029090610c20565b80601f01602080910402602001604051908101604052809291908181526020018280546102bc90610c20565b80156103095780601f106102de57610100808354040283529160200191610309565b820191906000526020600020905b8154815290600101906020018083116102ec57829003601f168201915b5050505050905090565b600033610321818585610503565b60019150505b92915050565b60003361033b858285610627565b6103468585856106a1565b506001949350505050565b600033610321818585610364838361045a565b61036e9190610c5a565b610503565b61037b610850565b6103836108b0565b565b61038d610850565b6103978282610902565b5050565b6103a3610850565b61038360006109cd565b6103b5610850565b610383610a27565b60606004805461029090610c20565b600033816103da828661045a565b90508381101561043f5760405162461bcd60e51b815260206004820152602560248201527f45524332303a2064656372656173656420616c6c6f77616e63652062656c6f77604482015264207a65726f60d81b60648201526084015b60405180910390fd5b6103468286868403610503565b6000336103218185856106a1565b6001600160a01b03918216600090815260016020908152604080832093909416825291909152205490565b61048d610850565b6001600160a01b038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let initCodeHash = utils.keccak256(initCode);
var isValid = false;
const regex = /^0x0000.*$/; // 表达式
// 166168 0x0000000000000000000000000000000000000000000000000000000000028919 0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5
// 364256 0x0000000000000000000000000000000000000000000000000000000000058ee2 0x000003dec64147218c901161B82325c40BACe25C
let index = 166168;
while (!isValid) {
console.log(index);
let salt = ethers.utils.hexZeroPad(ethers.utils.hexlify(index), 32);
let address = getAddressCreate2(from, salt, initCodeHash);
isValid = regex.test(address);
if (isValid) {
console.log("Create2:" + salt + " " + address);
return;
}
index++;
}
}
function getAddressCreate2(from, salt, initCodeHash) {
let address = ethers.utils.getCreate2Address(from, salt, initCodeHash);
// console.log("Create2:" + salt + " " + address);
return address;
}
salt: 0x0000000000000000000000000000000000000000000000000000000000028919
预先计算的合约地址：0x000013A1d7c63D56C8a5d58c93D1fb977cB409c5
4. 调用Create2 Factory合约
Transaction Hash: https://goerli.etherscan.io/tx/0xf0f442c3022e1001a080bf72747239dcf822c705bcb8c13cf6aa0505e97085e4
5. etherscan验证合约（Standard-Json-Input）
验证地址：https://goerli.etherscan.io/verifyContract
如何获取 Standard-Json-Input？
json路径：contracts/artifacts/build-info/4f94fb575ff59e02f4.json
input字段的内容。
CNYT.json
{
"language": "Solidity",
"sources":
{
"contracts/CNYT.sol":
{
"content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.0;\n\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\nimport \"@openzeppelin/contracts/security/Pausable.sol\";\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\n\ncontract CNYT is ERC20, Pausable, Ownable {\n constructor() ERC20(\"CNYT\", \"CNYT\") {\n _mint(tx.origin, 100000000 * 10**decimals());\n _transferOwnership(tx.origin);\n }\n\n function pause() public onlyOwner {\n _pause();\n }\n\n function unpause() public onlyOwner {\n _unpause();\n }\n\n function mint(address to, uint256 amount) public onlyOwner {\n _mint(to, amount);\n }\n\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal override whenNotPaused {\n super._beforeTokenTransfer(from, to, amount);\n }\n\n function decimals() public view virtual override returns (uint8) {\n return 6;\n }\n}\n"
},
"@openzeppelin/contracts/access/Ownable.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor() {\n _transferOwnership(_msgSender());\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n _checkOwner();\n _;\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if the sender is not the owner.\n */\n function _checkOwner() internal view virtual {\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n _transferOwnership(address(0));\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual {\n address oldOwner = _owner;\n _owner = newOwner;\n emit OwnershipTransferred(oldOwner, newOwner);\n }\n}\n"
},
"@openzeppelin/contracts/security/Pausable.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which allows children to implement an emergency stop\n * mechanism that can be triggered by an authorized account.\n *\n * This module is used through inheritance. It will make available the\n * modifiers `whenNotPaused` and `whenPaused`, which can be applied to\n * the functions of your contract. Note that they will not be pausable by\n * simply including this module, only once the modifiers are put in place.\n */\nabstract contract Pausable is Context {\n /**\n * @dev Emitted when the pause is triggered by `account`.\n */\n event Paused(address account);\n\n /**\n * @dev Emitted when the pause is lifted by `account`.\n */\n event Unpaused(address account);\n\n bool private _paused;\n\n /**\n * @dev Initializes the contract in unpaused state.\n */\n constructor() {\n _paused = false;\n }\n\n /**\n * @dev Modifier to make a function callable only when the contract is not paused.\n *\n * Requirements:\n *\n * - The contract must not be paused.\n */\n modifier whenNotPaused() {\n _requireNotPaused();\n _;\n }\n\n /**\n * @dev Modifier to make a function callable only when the contract is paused.\n *\n * Requirements:\n *\n * - The contract must be paused.\n */\n modifier whenPaused() {\n _requirePaused();\n _;\n }\n\n /**\n * @dev Returns true if the contract is paused, and false otherwise.\n */\n function paused() public view virtual returns (bool) {\n return _paused;\n }\n\n /**\n * @dev Throws if the contract is paused.\n */\n function _requireNotPaused() internal view virtual {\n require(!paused(), \"Pausable: paused\");\n }\n\n /**\n * @dev Throws if the contract is not paused.\n */\n function _requirePaused() internal view virtual {\n require(paused(), \"Pausable: not paused\");\n }\n\n /**\n * @dev Triggers stopped state.\n *\n * Requirements:\n *\n * - The contract must not be paused.\n */\n function _pause() internal virtual whenNotPaused {\n _paused = true;\n emit Paused(_msgSender());\n }\n\n /**\n * @dev Returns to normal state.\n *\n * Requirements:\n *\n * - The contract must be paused.\n */\n function _unpause() internal virtual whenPaused {\n _paused = false;\n emit Unpaused(_msgSender());\n }\n}\n"
},
"@openzeppelin/contracts/token/ERC20/ERC20.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC20.sol\";\nimport \"./extensions/IERC20Metadata.sol\";\nimport \"../../utils/Context.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\n * instead returning `false` on failure. This behavior is nonetheless\n * conventional and does not conflict with the expectations of ERC20\n * applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is Context, IERC20, IERC20Metadata {\n mapping(address => uint256) private _balances;\n\n mapping(address => mapping(address => uint256)) private _allowances;\n\n uint256 private _totalSupply;\n\n string private _name;\n string private _symbol;\n\n /**\n * @dev Sets the values for {name} and {symbol}.\n *\n * The default value of {decimals} is 18. To select a different value for\n * {decimals} you should overload it.\n *\n * All two of these values are immutable: they can only be set once during\n * construction.\n */\n constructor(string memory name_, string memory symbol_) {\n _name = name_;\n _symbol = symbol_;\n }\n\n /**\n * @dev Returns the name of the token.\n */\n function name() public view virtual override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev Returns the symbol of the token, usually a shorter version of the\n * name.\n */\n function symbol() public view virtual override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev Returns the number of decimals used to get its user representation.\n * For example, if `decimals` equals `2`, a balance of `505` tokens should\n * be displayed to a user as `5.05` (`505 / 10 ** 2`).\n *\n * Tokens usually opt for a value of 18, imitating the relationship between\n * Ether and Wei. This is the value {ERC20} uses, unless this function is\n * overridden;\n *\n * NOTE: This information is only used for _display_ purposes: it in\n * no way affects any of the arithmetic of the contract, including\n * {IERC20-balanceOf} and {IERC20-transfer}.\n */\n function decimals() public view virtual override returns (uint8) {\n return 18;\n }\n\n /**\n * @dev See {IERC20-totalSupply}.\n */\n function totalSupply() public view virtual override returns (uint256) {\n return _totalSupply;\n }\n\n /**\n * @dev See {IERC20-balanceOf}.\n */\n function balanceOf(address account) public view virtual override returns (uint256) {\n return _balances[account];\n }\n\n /**\n * @dev See {IERC20-transfer}.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - the caller must have a balance of at least `amount`.\n */\n function transfer(address to, uint256 amount) public virtual override returns (bool) {\n address owner = _msgSender();\n _transfer(owner, to, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-allowance}.\n */\n function allowance(address owner, address spender) public view virtual override returns (uint256) {\n return _allowances[owner][spender];\n }\n\n /**\n * @dev See {IERC20-approve}.\n *\n * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\n * `transferFrom`. This is semantically equivalent to an infinite approval.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function approve(address spender, uint256 amount) public virtual override returns (bool) {\n address owner = _msgSender();\n _approve(owner, spender, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-transferFrom}.\n *\n * Emits an {Approval} event indicating the updated allowance. This is not\n * required by the EIP. See the note at the beginning of {ERC20}.\n *\n * NOTE: Does not update the allowance if the current allowance\n * is the maximum `uint256`.\n *\n * Requirements:\n *\n * - `from` and `to` cannot be the zero address.\n * - `from` must have a balance of at least `amount`.\n * - the caller must have allowance for ``from``'s tokens of at least\n * `amount`.\n */\n function transferFrom(\n address from,\n address to,\n uint256 amount\n ) public virtual override returns (bool) {\n address spender = _msgSender();\n _spendAllowance(from, spender, amount);\n _transfer(from, to, amount);\n return true;\n }\n\n /**\n * @dev Atomically increases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n address owner = _msgSender();\n _approve(owner, spender, allowance(owner, spender) + addedValue);\n return true;\n }\n\n /**\n * @dev Atomically decreases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n * - `spender` must have allowance for the caller of at least\n * `subtractedValue`.\n */\n function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n address owner = _msgSender();\n uint256 currentAllowance = allowance(owner, spender);\n require(currentAllowance >= subtractedValue, \"ERC20: decreased allowance below zero\");\n unchecked {\n _approve(owner, spender, currentAllowance - subtractedValue);\n }\n\n return true;\n }\n\n /**\n * @dev Moves `amount` of tokens from `from` to `to`.\n *\n * This internal function is equivalent to {transfer}, and can be used to\n * e.g. implement automatic token fees, slashing mechanisms, etc.\n *\n * Emits a {Transfer} event.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `from` must have a balance of at least `amount`.\n */\n function _transfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {\n require(from != address(0), \"ERC20: transfer from the zero address\");\n require(to != address(0), \"ERC20: transfer to the zero address\");\n\n _beforeTokenTransfer(from, to, amount);\n\n uint256 fromBalance = _balances[from];\n require(fromBalance >= amount, \"ERC20: transfer amount exceeds balance\");\n unchecked {\n _balances[from] = fromBalance - amount;\n // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by\n // decrementing then incrementing.\n _balances[to] += amount;\n }\n\n emit Transfer(from, to, amount);\n\n _afterTokenTransfer(from, to, amount);\n }\n\n /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n * the total supply.\n *\n * Emits a {Transfer} event with `from` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n */\n function _mint(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: mint to the zero address\");\n\n _beforeTokenTransfer(address(0), account, amount);\n\n _totalSupply += amount;\n unchecked {\n // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.\n _balances[account] += amount;\n }\n emit Transfer(address(0), account, amount);\n\n _afterTokenTransfer(address(0), account, amount);\n }\n\n /**\n * @dev Destroys `amount` tokens from `account`, reducing the\n * total supply.\n *\n * Emits a {Transfer} event with `to` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n * - `account` must have at least `amount` tokens.\n */\n function _burn(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: burn from the zero address\");\n\n _beforeTokenTransfer(account, address(0), amount);\n\n uint256 accountBalance = _balances[account];\n require(accountBalance >= amount, \"ERC20: burn amount exceeds balance\");\n unchecked {\n _balances[account] = accountBalance - amount;\n // Overflow not possible: amount <= accountBalance <= totalSupply.\n _totalSupply -= amount;\n }\n\n emit Transfer(account, address(0), amount);\n\n _afterTokenTransfer(account, address(0), amount);\n }\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n *\n * This internal function is equivalent to `approve`, and can be used to\n * e.g. set automatic allowances for certain subsystems, etc.\n *\n * Emits an {Approval} event.\n *\n * Requirements:\n *\n * - `owner` cannot be the zero address.\n * - `spender` cannot be the zero address.\n */\n function _approve(\n address owner,\n address spender,\n uint256 amount\n ) internal virtual {\n require(owner != address(0), \"ERC20: approve from the zero address\");\n require(spender != address(0), \"ERC20: approve to the zero address\");\n\n _allowances[owner][spender] = amount;\n emit Approval(owner, spender, amount);\n }\n\n /**\n * @dev Updates `owner` s allowance for `spender` based on spent `amount`.\n *\n * Does not update the allowance amount in case of infinite allowance.\n * Revert if not enough allowance is available.\n *\n * Might emit an {Approval} event.\n */\n function _spendAllowance(\n address owner,\n address spender,\n uint256 amount\n ) internal virtual {\n uint256 currentAllowance = allowance(owner, spender);\n if (currentAllowance != type(uint256).max) {\n require(currentAllowance >= amount, \"ERC20: insufficient allowance\");\n unchecked {\n _approve(owner, spender, currentAllowance - amount);\n }\n }\n }\n\n /**\n * @dev Hook that is called before any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * will be transferred to `to`.\n * - when `from` is zero, `amount` tokens will be minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {}\n\n /**\n * @dev Hook that is called after any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * has been transferred to `to`.\n * - when `from` is zero, `amount` tokens have been minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens have been burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _afterTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {}\n}\n"
},
"@openzeppelin/contracts/utils/Context.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n}\n"
},
"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\n\n/**\n * @dev Interface for the optional metadata functions from the ERC20 standard.\n *\n * _Available since v4.1._\n */\ninterface IERC20Metadata is IERC20 {\n /**\n * @dev Returns the name of the token.\n */\n function name() external view returns (string memory);\n\n /**\n * @dev Returns the symbol of the token.\n */\n function symbol() external view returns (string memory);\n\n /**\n * @dev Returns the decimals places of the token.\n */\n function decimals() external view returns (uint8);\n}\n"
},
"@openzeppelin/contracts/token/ERC20/IERC20.sol":
{
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `to`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address to, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `from` to `to` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address from,\n address to,\n uint256 amount\n ) external returns (bool);\n}\n"
}
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"runs": 200
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