文件 1 的 1:OHOHOH.sol
pragma solidity ^0.6.2;
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this;
return msg.data;
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, 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 sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
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");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
if (returndata.length > 0) {
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) internal _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
function name() public view returns (string memory) {
return _name;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function decimals() public view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, 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) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, 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 = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(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);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(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 _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
contract OhOhOh is ERC20, Ownable {
address public feeRecipient;
address public burnAddress;
bool private activeFee;
uint256 burnPercent;
uint256 rewardPercent;
uint256 xmasGift;
constructor() public ERC20("ohohoh.io", "OHOHOH") {
_mint(0x891f6D0e871b91dabdD89f77d91C0cd7A1f4eC0B, 2260000000000000000000);
_mint(address(this), 252000000000000000000);
feeRecipient = 0x891f6D0e871b91dabdD89f77d91C0cd7A1f4eC0B;
burnAddress = 0x000000000000000000000000000000000000dEaD;
activeFee = false;
burnPercent = 5500;
rewardPercent = 4500;
xmasGift = 252000000000000000000;
}
mapping (address => bool) public feeException;
event AddFeeException(address account);
event RemoveFeeException(address account);
function activateFee(bool _activeFee) public onlyOwner {
activeFee = _activeFee;
}
function addFeeException(address account) public onlyOwner {
feeException[account] = true;
emit AddFeeException(account);
}
function removeFeeException(address account) public onlyOwner {
feeException[account] = false;
emit RemoveFeeException(account);
}
function getTransferFee() public view returns(uint256) {
if (activeFee == false) return 0;
uint256 transferFee;
uint256 blockTime = block.timestamp;
if (blockTime < 1606780800) {
transferFee = 0;
} else if(blockTime < 1606867200) {
transferFee = 100;
} else if(blockTime < 1606953600) {
transferFee = 200;
} else if(blockTime < 1607040000) {
transferFee = 300;
} else if(blockTime < 1607126400) {
transferFee = 400;
} else if(blockTime < 1607212800) {
transferFee = 500;
} else if(blockTime < 1607299200) {
transferFee = 600;
} else if(blockTime < 1607385600) {
transferFee = 700;
} else if(blockTime < 1607472000) {
transferFee = 800;
} else if(blockTime < 1607558400) {
transferFee = 900;
} else if(blockTime < 1607644800) {
transferFee = 1000;
} else if(blockTime < 1607731200) {
transferFee = 1100;
} else if(blockTime < 1607817600) {
transferFee = 1200;
} else if(blockTime < 1607904000) {
transferFee = 1300;
} else if(blockTime < 1607990400) {
transferFee = 1400;
} else if(blockTime < 1608076800) {
transferFee = 1500;
} else if(blockTime < 1608163200) {
transferFee = 1600;
} else if(blockTime < 1608249600) {
transferFee = 1700;
} else if(blockTime < 1608336000) {
transferFee = 1800;
} else if(blockTime < 1608422400) {
transferFee = 1900;
} else if(blockTime < 1608508800) {
transferFee = 2000;
} else if(blockTime < 1608595200) {
transferFee = 2100;
} else if(blockTime < 1608681600) {
transferFee = 2200;
} else if(blockTime < 1608768000) {
transferFee = 2300;
} else if(blockTime < 1608854400) {
transferFee = 2400;
} else {
transferFee = 2500;
}
return transferFee;
}
function unlockXmasReward() public {
require(block.timestamp > 1608422400);
_transfer(address(this), feeRecipient, xmasGift);
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
if (activeFee && feeException[_msgSender()] == false) {
uint256 transferFee = getTransferFee();
uint256 fee = transferFee.mul(amount).div(10000);
uint256 amountLessFee = amount.sub(fee);
uint256 amountBurnt = fee.mul(burnPercent).div(10000);
uint256 amountRewarded = fee.mul(rewardPercent).div(10000);
_transfer(_msgSender(), recipient, amountLessFee);
_transfer(_msgSender(), feeRecipient, amountRewarded);
_transfer(_msgSender(), burnAddress, amountBurnt);
} else {
_transfer(_msgSender(), recipient, amount);
}
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
if (activeFee && feeException[recipient] == false) {
uint256 transferFee = getTransferFee();
uint256 fee = transferFee.mul(amount).div(10000);
uint256 amountBurnt = fee.mul(burnPercent).div(10000);
uint256 amountRewarded = fee.mul(rewardPercent).div(10000);
_transfer(sender, feeRecipient, amountRewarded);
_transfer(sender, burnAddress, amountBurnt);
}
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
}