可以加上USDT源代码吗

Open linaifeng opened this issue 5 years ago • 0 comments

token：0xdac17f958d2ee523a2206206994597c13d831ec7 source： /** *Submitted for verification at Etherscan.io on 2017-11-28 */

pragma solidity ^0.4.17;

/**

@title SafeMath
@dev Math operations with safety checks that throw on error */ library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; }

function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; }

function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; }

function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } }

/**

@title Ownable
@dev The Ownable contract has an owner address, and provides basic authorization control
functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner;

/**
- @dev The Ownable constructor sets the original owner of the contract to the sender
- account. */ function Ownable() public { owner = msg.sender; }
/**
- @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; }
/**
- @dev Allows the current owner to transfer control of the contract to a newOwner.
- @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { if (newOwner != address(0)) { owner = newOwner; } }

}

/**

@title ERC20Basic
@dev Simpler version of ERC20 interface
@dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20Basic { uint public _totalSupply; function totalSupply() public constant returns (uint); function balanceOf(address who) public constant returns (uint); function transfer(address to, uint value) public; event Transfer(address indexed from, address indexed to, uint value); }

/**

@title ERC20 interface
@dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public constant returns (uint); function transferFrom(address from, address to, uint value) public; function approve(address spender, uint value) public; event Approval(address indexed owner, address indexed spender, uint value); }

/**

@title Basic token
@dev Basic version of StandardToken, with no allowances. */ contract BasicToken is Ownable, ERC20Basic { using SafeMath for uint;

mapping(address => uint) public balances;

// additional variables for use if transaction fees ever became necessary uint public basisPointsRate = 0; uint public maximumFee = 0;

/**
- @dev Fix for the ERC20 short address attack. */ modifier onlyPayloadSize(uint size) { require(!(msg.data.length < size + 4)); _; }
/**
- @dev transfer token for a specified address
- @param _to The address to transfer to.
- @param _value The amount to be transferred. */ function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) { uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } uint sendAmount = _value.sub(fee); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(msg.sender, owner, fee); } Transfer(msg.sender, _to, sendAmount); }
/**
- @dev Gets the balance of the specified address.
- @param _owner The address to query the the balance of.
- @return An uint representing the amount owned by the passed address. */ function balanceOf(address _owner) public constant returns (uint balance) { return balances[_owner]; }

}

/**

@title Standard ERC20 token
@dev Implementation of the basic standard token.
@dev https://github.com/ethereum/EIPs/issues/20
@dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is BasicToken, ERC20 {

mapping (address => mapping (address => uint)) public allowed;

uint public constant MAX_UINT = 2**256 - 1;

/**
- @dev Transfer tokens from one address to another
- @param _from address The address which you want to send tokens from
- @param _to address The address which you want to transfer to
- @param _value uint the amount of tokens to be transferred */ function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) { var _allowance = allowed[_from][msg.sender];
  
  // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met // if (_value > _allowance) throw;
  
  uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } if (_allowance < MAX_UINT) { allowed[_from][msg.sender] = _allowance.sub(_value); } uint sendAmount = _value.sub(fee); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(_from, owner, fee); } Transfer(_from, _to, sendAmount); }
/**
- @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
- @param _spender The address which will spend the funds.
- @param _value The amount of tokens to be spent. */ function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
  
  // To change the approve amount you first have to reduce the addresses// allowance to zero by callingapprove(_spender, 0)` if it is not // already 0 to mitigate the race condition described here: // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 require(!((_value != 0) && (allowed[msg.sender][_spender] != 0)));
  
  allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); }
/**
- @dev Function to check the amount of tokens than an owner allowed to a spender.
- @param _owner address The address which owns the funds.
- @param _spender address The address which will spend the funds.
- @return A uint specifying the amount of tokens still available for the spender. */ function allowance(address _owner, address _spender) public constant returns (uint remaining) { return allowed[_owner][_spender]; }

}

/**

@title Pausable
@dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause();

bool public paused = false;

/**

@dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; }

/**

@dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; }

/**

@dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused public { paused = true; Pause(); }

/**

@dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; Unpause(); } }

contract BlackList is Ownable, BasicToken {

/////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) ///////
function getBlackListStatus(address _maker) external constant returns (bool) {
    return isBlackListed[_maker];
}

function getOwner() external constant returns (address) {
    return owner;
}

mapping (address => bool) public isBlackListed;

function addBlackList (address _evilUser) public onlyOwner {
    isBlackListed[_evilUser] = true;
    AddedBlackList(_evilUser);
}

function removeBlackList (address _clearedUser) public onlyOwner {
    isBlackListed[_clearedUser] = false;
    RemovedBlackList(_clearedUser);
}

function destroyBlackFunds (address _blackListedUser) public onlyOwner {
    require(isBlackListed[_blackListedUser]);
    uint dirtyFunds = balanceOf(_blackListedUser);
    balances[_blackListedUser] = 0;
    _totalSupply -= dirtyFunds;
    DestroyedBlackFunds(_blackListedUser, dirtyFunds);
}

event DestroyedBlackFunds(address _blackListedUser, uint _balance);

event AddedBlackList(address _user);

event RemovedBlackList(address _user);

}

contract UpgradedStandardToken is StandardToken{ // those methods are called by the legacy contract // and they must ensure msg.sender to be the contract address function transferByLegacy(address from, address to, uint value) public; function transferFromByLegacy(address sender, address from, address spender, uint value) public; function approveByLegacy(address from, address spender, uint value) public; }

contract TetherToken is Pausable, StandardToken, BlackList {

string public name;
string public symbol;
uint public decimals;
address public upgradedAddress;
bool public deprecated;

//  The contract can be initialized with a number of tokens
//  All the tokens are deposited to the owner address
//
// @param _balance Initial supply of the contract
// @param _name Token Name
// @param _symbol Token symbol
// @param _decimals Token decimals
function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public {
    _totalSupply = _initialSupply;
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
    balances[owner] = _initialSupply;
    deprecated = false;
}

// Forward ERC20 methods to upgraded contract if this one is deprecated
function transfer(address _to, uint _value) public whenNotPaused {
    require(!isBlackListed[msg.sender]);
    if (deprecated) {
        return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value);
    } else {
        return super.transfer(_to, _value);
    }
}

// Forward ERC20 methods to upgraded contract if this one is deprecated
function transferFrom(address _from, address _to, uint _value) public whenNotPaused {
    require(!isBlackListed[_from]);
    if (deprecated) {
        return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value);
    } else {
        return super.transferFrom(_from, _to, _value);
    }
}

// Forward ERC20 methods to upgraded contract if this one is deprecated
function balanceOf(address who) public constant returns (uint) {
    if (deprecated) {
        return UpgradedStandardToken(upgradedAddress).balanceOf(who);
    } else {
        return super.balanceOf(who);
    }
}

// Forward ERC20 methods to upgraded contract if this one is deprecated
function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
    if (deprecated) {
        return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value);
    } else {
        return super.approve(_spender, _value);
    }
}

// Forward ERC20 methods to upgraded contract if this one is deprecated
function allowance(address _owner, address _spender) public constant returns (uint remaining) {
    if (deprecated) {
        return StandardToken(upgradedAddress).allowance(_owner, _spender);
    } else {
        return super.allowance(_owner, _spender);
    }
}

// deprecate current contract in favour of a new one
function deprecate(address _upgradedAddress) public onlyOwner {
    deprecated = true;
    upgradedAddress = _upgradedAddress;
    Deprecate(_upgradedAddress);
}

// deprecate current contract if favour of a new one
function totalSupply() public constant returns (uint) {
    if (deprecated) {
        return StandardToken(upgradedAddress).totalSupply();
    } else {
        return _totalSupply;
    }
}

// Issue a new amount of tokens
// these tokens are deposited into the owner address
//
// @param _amount Number of tokens to be issued
function issue(uint amount) public onlyOwner {
    require(_totalSupply + amount > _totalSupply);
    require(balances[owner] + amount > balances[owner]);

    balances[owner] += amount;
    _totalSupply += amount;
    Issue(amount);
}

// Redeem tokens.
// These tokens are withdrawn from the owner address
// if the balance must be enough to cover the redeem
// or the call will fail.
// @param _amount Number of tokens to be issued
function redeem(uint amount) public onlyOwner {
    require(_totalSupply >= amount);
    require(balances[owner] >= amount);

    _totalSupply -= amount;
    balances[owner] -= amount;
    Redeem(amount);
}

function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner {
    // Ensure transparency by hardcoding limit beyond which fees can never be added
    require(newBasisPoints < 20);
    require(newMaxFee < 50);

    basisPointsRate = newBasisPoints;
    maximumFee = newMaxFee.mul(10**decimals);

    Params(basisPointsRate, maximumFee);
}

// Called when new token are issued
event Issue(uint amount);

// Called when tokens are redeemed
event Redeem(uint amount);

// Called when contract is deprecated
event Deprecate(address newAddress);

// Called if contract ever adds fees
event Params(uint feeBasisPoints, uint maxFee);

}

Dec 14 '20 02:12 linaifeng