TetherToken

{"EIP20Interface.sol":{"content":"// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface EIP20Interface {
    function totalSupply() external view returns (uint256);
    function balanceOf(address _account) external view returns (uint256 balance);
    function transfer(address _to, uint256 _value) external returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
    function approve(address _spender, uint256 _value) external returns (bool success);
    function allowance(address _account, address _spender) external view returns (uint256 remaining);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function paused() external view returns (bool);
    function isBlacklisted(address account) external view returns (bool);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    event Blacklisted(address indexed account);
    event Unblacklisted(address indexed account);
    event Paused(address account);
    event Unpaused(address account);
    event FeeSet(uint256 feeBasisPoints);
    event FeeRecipientSet(address recipient);
    event Mint(address indexed to, uint256 amount);
    event Burn(address indexed from, uint256 amount);
    event Redeem(address indexed from, uint256 amount);
}"},"TetherUSD.sol":{"content":"// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "./EIP20Interface.sol";

contract TetherToken is EIP20Interface {
    mapping(address =\u003e uint256) private _balances;
    mapping(address =\u003e mapping(address =\u003e uint256)) private _allowances;
    mapping(address =\u003e bool) private _blacklisted;
    
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint256 private _feeBasisPoints;
    address private _feeRecipient;
    bool private _paused;
    address private _owner;

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

    constructor(address initialOwner) {
        require(initialOwner != address(0), "Invalid owner address");
        _owner = initialOwner;
        
        _name = "Tether USD";
        _symbol = "USDT";
        _decimals = 6;
        _totalSupply = 9876543210 * (10 ** uint256(_decimals));
        _balances[initialOwner] = _totalSupply;
        _feeBasisPoints = 0;
        _feeRecipient = initialOwner;
        _paused = false;

        emit Transfer(address(0), initialOwner, _totalSupply);
        emit OwnershipTransferred(address(0), initialOwner);
    }

    modifier onlyOwner() {
        require(msg.sender == _owner, "Caller is not owner");
        _;
    }

    modifier whenNotPaused() {
        require(!_paused, "Contract paused");
        _;
    }

    // ERC20标准函数
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

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

    function transfer(address to, uint256 value) public override whenNotPaused returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) public override whenNotPaused returns (bool) {
        _spendAllowance(from, msg.sender, value);
        _transfer(from, to, value);
        return true;
    }

    function approve(address spender, uint256 value) public override returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function allowance(address accountOwner, address spender) public view override returns (uint256) {
        return _allowances[accountOwner][spender];
    }

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

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

    function decimals() public view override returns (uint8) {
        return _decimals;
    }

    // 管理功能
    function pause() external onlyOwner {
        require(!_paused, "Already paused");
        _paused = true;
        emit Paused(msg.sender);
    }

    function unpause() external onlyOwner {
        require(_paused, "Not paused");
        _paused = false;
        emit Unpaused(msg.sender);
    }

    function paused() public view override returns (bool) {
        return _paused;
    }

    function blacklist(address account) external onlyOwner {
        require(!_blacklisted[account], "Already blacklisted");
        _blacklisted[account] = true;
        emit Blacklisted(account);
    }

    function unblacklist(address account) external onlyOwner {
        require(_blacklisted[account], "Not blacklisted");
        _blacklisted[account] = false;
        emit Unblacklisted(account);
    }

    function isBlacklisted(address account) public view override returns (bool) {
        return _blacklisted[account];
    }

    function mint(address to, uint256 amount) external onlyOwner {
        require(to != address(0), "Mint to zero address");
        _totalSupply += amount;
        _balances[to] += amount;
        emit Mint(to, amount);
        emit Transfer(address(0), to, amount);
    }

    function burn(address from, uint256 amount) external onlyOwner {
        _burn(from, amount);
    }

    function redeem(uint256 amount) external {
        _burn(msg.sender, amount);
        emit Redeem(msg.sender, amount);
    }

    function setFee(uint256 feeBasisPoints) external onlyOwner {
        require(feeBasisPoints \u003c= 10000, "Fee too high");
        _feeBasisPoints = feeBasisPoints;
        emit FeeSet(feeBasisPoints);
    }

    function setFeeRecipient(address recipient) external onlyOwner {
        require(recipient != address(0), "Invalid recipient");
        _feeRecipient = recipient;
        emit FeeRecipientSet(recipient);
    }

    function getOwner() public view returns (address) {
        return _owner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "Invalid new owner");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    // 内部函数
    function _transfer(address from, address to, uint256 value) internal {
        require(from != address(0), "Transfer from zero address");
        require(to != address(0), "Transfer to zero address");
        require(value \u003e 0, "Invalid amount");
        require(!_blacklisted[from], "Sender blacklisted");
        require(!_blacklisted[to], "Recipient blacklisted");
        require(_balances[from] \u003e= value, "Insufficient balance");

        uint256 fee = (value * _feeBasisPoints) / 10000;
        uint256 netAmount = value - fee;

        _balances[from] -= value;
        _balances[to] += netAmount;

        if (fee \u003e 0) {
            _balances[_feeRecipient] += fee;
            emit Transfer(from, _feeRecipient, fee);
        }

        emit Transfer(from, to, netAmount);
    }

    function _approve(address accountOwner, address spender, uint256 value) internal {
        require(accountOwner != address(0), "Approve from zero address");
        require(spender != address(0), "Approve to zero address");
        _allowances[accountOwner][spender] = value;
        emit Approval(accountOwner, spender, value);
    }

    function _spendAllowance(address accountOwner, address spender, uint256 value) internal {
        uint256 currentAllowance = allowance(accountOwner, spender);
        require(currentAllowance \u003e= value, "Insufficient allowance");
        _approve(accountOwner, spender, currentAllowance - value);
    }

    function _burn(address from, uint256 amount) internal {
        require(from != address(0), "Burn from zero address");
        require(amount \u003e 0, "Invalid amount");
        require(_balances[from] \u003e= amount, "Insufficient balance");
        
        _balances[from] -= amount;
        _totalSupply -= amount;
        emit Burn(from, amount);
        emit Transfer(from, address(0), amount);
    }
}"}}