文件 1 的 1：BOFA.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;
}
}
library SafeMath {
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
modifier onlyOwner() {
_checkOwner();
_;
}
function owner() public view virtual returns (address) {
return _owner;
}
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
abstract contract ReentrancyGuard {
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
_status = _ENTERED;
}
function _nonReentrantAfter() private {
_status = _NOT_ENTERED;
}
}
interface IERC20 {
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
}
interface IERC20Metadata is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 18;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
contract BOFA is ERC20, Ownable, ReentrancyGuard {
using SafeMath for uint256;
mapping(address => uint256) public deposits;
address[] public depositors;
address public feeReceiver;
uint256 public totalDeposits;
uint256 public constant maxSupply = 1_000_000_000_000 * 10 ** 18;
bool public maxTransaction;
bool public taxEnabled;
bool public initialPoolOpen;
constructor() ERC20("BOFA", "BOFA") {
_mint(msg.sender, maxSupply);
taxEnabled = false;
initialPoolOpen = true;
feeReceiver = msg.sender;
}
function deposit() public payable nonReentrant {
require(initialPoolOpen, "Initial pool is not open");
require(deposits[msg.sender] <= 0.5 ether, "You have already contributed the maximum amount");
require(msg.value >= 0.01 ether, "Minimum deposit is 0.05 ETH");
require(msg.value <= 0.5 ether, "Maximum deposit is 1 ETH");
require(totalDeposits.add(msg.value) <= 25 ether, "Deposit pool limit reached");
if (deposits[msg.sender] == 0) {
depositors.push(msg.sender);
}
deposits[msg.sender] = deposits[msg.sender].add(msg.value);
totalDeposits = totalDeposits.add(msg.value);
}
function refund() public nonReentrant {
require(initialPoolOpen, "Initial pool is still open");
require(deposits[msg.sender] > 0, "No deposits found");
uint256 amount = deposits[msg.sender];
deposits[msg.sender] = 0;
totalDeposits = totalDeposits.sub(amount);
(bool success,) = msg.sender.call{value: amount}("");
require(success, "Withdraw failed");
}
function distributeTokens() public onlyOwner nonReentrant {
require(!initialPoolOpen, "Initial pool is still open");
require(totalDeposits > 0, "No deposits found");
uint256 tokenAmount = maxSupply.div(2);
uint256 addressCount = depositors.length;
for (uint256 i = 0; i < addressCount; i++) {
address recipient = depositors[i];
uint256 depositAmount = deposits[recipient];
uint256 tokensToSend = depositAmount.mul(tokenAmount).div(totalDeposits);
super._transfer(address(this), recipient, tokensToSend);
emit Transfer(address(this), recipient, tokensToSend);
}
for (uint256 i = 0; i < addressCount; i++) {
delete deposits[depositors[i]];
}
depositors = new address[](0);
totalDeposits = 0;
}
function isMaxTransaction(bool enabled) public onlyOwner {
maxTransaction = enabled;
}
function isPoolOpen(bool enabled) public onlyOwner {
initialPoolOpen = enabled;
}
function isTaxEnabled(bool enabled) public onlyOwner {
taxEnabled = enabled;
}
function setFeeReceiver(address receiver) public onlyOwner {
feeReceiver = receiver;
}
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
if (taxEnabled && msg.sender != owner() && recipient != feeReceiver) {
uint256 taxAmount = amount.div(100);
uint256 transferAmount = amount.sub(taxAmount);
if (maxTransaction) {
require(transferAmount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
}
super.transfer(feeReceiver, taxAmount);
return super.transfer(recipient, transferAmount);
} else {
if (maxTransaction) {
require(amount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
}
return super.transfer(recipient, amount);
}
}
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
if (taxEnabled && sender != owner() && recipient != feeReceiver) {
uint256 taxAmount = amount.div(100);
uint256 transferAmount = amount.sub(taxAmount);
if (maxTransaction) {
require(transferAmount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
}
super.transferFrom(sender, feeReceiver, taxAmount);
return super.transferFrom(sender, recipient, transferAmount);
} else {
if (maxTransaction) {
require(amount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
}
return super.transferFrom(sender, recipient, amount);
}
}
function withdraw() public onlyOwner {
uint256 balance = address(this).balance;
payable(msg.sender).transfer(balance);
}
}
