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pragma solidity ^0.4.0;

//https://github.com/nexusdev/erc20/blob/master/contracts/erc20.sol

contract ERC20Constant {

function totalSupply() constant returns (uint supply);

function balanceOf( address who ) constant returns (uint value);

function allowance(address owner, address spender) constant returns (uint _allowance);

}

contract ERC20Stateful {

function transfer( address to, uint value) returns (bool ok);

function transferFrom( address from, address to, uint value) returns (bool ok);

function approve(address spender, uint value) returns (bool ok);

}

contract ERC20Events {

event Transfer(address indexed from, address indexed to, uint value);

event Approval( address indexed owner, address indexed spender, uint value);

}

contract ERC20 is ERC20Constant, ERC20Stateful, ERC20Events {}

contract owned { address public owner; function owned() { owner = msg.sender; }

contract owned {

modifier onlyOwner { if (msg.sender != owner) throw; _; }

address public owner;

function transferOwnership(address newOwner) onlyOwner { owner = newOwner; }

function owned() {

owner = msg.sender;

}

modifier onlyOwner {

if (msg.sender != owner) throw;

}

function transferOwnership(address newOwner) onlyOwner {

owner = newOwner;

}

contract BECTrader is owned {

// contract can buy or sell tokens for ETH

address public asset;

// prices are in amount of wei per batch of token units

uint256 public becbuyPrice;

uint256 public becsellPrice;

contract TokenTrader is owned {

uint256 public units;

uint256 public becContractBalance;

address public asset; // address of token

uint256 public etcContractBalance;

uint256 public buyPrice; // contact buys lots of token at this price

bool public sellsTokens;

uint256 public sellPrice; // contract sells lots at this price

bool public buysTokens;

uint256 public units; // lot size (token-wei)

bool public sellsTokens; // is contract selling

bool public buysTokens; // is contract buying

event ActivatedEvent(bool sells, bool buys);

event UpdateEvent();

function BECTrader () {

function TokenTrader (

asset = 0x085fb4f24031eaedbc2b611aa528f22343eb52db;

address _asset,

becbuyPrice = 10100; // 1% fee on buy side

uint256 _buyPrice,

becsellPrice = 10000;

uint256 _sellPrice,

units = 8;

uint256 _units,

sellsTokens = true;

bool _sellsTokens,

buysTokens = true;

bool _buysTokens

etcContractBalance = this.balance;

)

becContractBalance = ERC20(asset).balanceOf(address(this));

{

asset = _asset;

buyPrice = _buyPrice;

sellPrice = _sellPrice;

units = _units;

sellsTokens = _sellsTokens;

buysTokens = _buysTokens;

ActivatedEvent(sellsTokens,buysTokens);

}

function Owneractivate (bool _sellsTokens,bool _buysTokens) onlyOwner {

// modify trading behavior

function activate (

bool _sellsTokens,

bool _buysTokens

) onlyOwner

{

sellsTokens = _sellsTokens;

buysTokens = _buysTokens;

ActivatedEvent(sellsTokens,buysTokens);

}

function OwnerSetPrices ( uint256 _buyPrice, uint256 _sellPrice, uint256 _units) onlyOwner {

// allows owner to deposit ETH

becsellPrice = _sellPrice;

// deposit tokens by sending them directly to contract

becbuyPrice = _buyPrice;

// buyers must not send tokens to the contract, use: sell(...)

units = _units;

function deposit() payable onlyOwner {

}

function OwnerdepositETC() payable onlyOwner {

// ower deposits tokens by sending them directly to contract

UpdateEvent();

}

function OwnerwithdrawBEC(uint256 _value) onlyOwner returns (bool ok) {

// allow owner to remove trade token

function withdrawAsset(uint256 _value) onlyOwner returns (bool ok)

{

return ERC20(asset).transfer(owner,_value);

UpdateEvent();

}

function OwnerwithdrawETC(uint256 _value) onlyOwner returns (bool ok)

// allow owner to remove arbitrary tokens

// included just in case contract receives wrong token

function withdrawToken(address _token, uint256 _value) onlyOwner returns (bool ok)

{

return ERC20(_token).transfer(owner,_value);

UpdateEvent();

}

// allow owner to remove ETH

function withdraw(uint256 _value) onlyOwner returns (bool ok)

{

if(this.balance >= _value) {

return owner.send(_value);

}

UpdateEvent();

}

function traderBuy() payable {

//user buys token with ETH

function buy() payable {

if(sellsTokens || msg.sender == owner)

{

uint order = msg.value / sellPrice;

uint order = msg.value / becsellPrice;

uint can_sell = ERC20(asset).balanceOf(address(this)) / units;

if(order > can_sell)

{

uint256 change = msg.value - (can_sell * sellPrice);

uint256 change = msg.value - (can_sell * becsellPrice);

order = can_sell;

if(!msg.sender.send(change)) throw;

}

if(order > 0) {

if(!ERC20(asset).transfer(msg.sender,order * units)) throw;

}

UpdateEvent();

}

else if(!msg.sender.send(msg.value)) throw; // return user funds if the contract is not selling

else if(!msg.sender.send(msg.value)) throw;

}

function traderSell(uint256 amount) {

// user sells token for ETH

// user must set allowance for this contract before calling

function sell(uint256 amount) {

if (buysTokens || msg.sender == owner) {

uint256 can_buy = this.balance / buyPrice; // token lots contract can buy

uint256 can_buy = this.balance / becbuyPrice;

uint256 order = amount / units; // token lots available

uint256 order = amount / units;

if(order > can_buy) order = can_buy;

if(order > can_buy) order = can_buy; // adjust order for funds

if (order > 0)

{

// extract user tokens

if(!ERC20(asset).transferFrom(msg.sender, address(this), order*units)) throw;

if(!ERC20(asset).transferFrom(msg.sender, address(this), amount)) throw;

if(!msg.sender.send(order * becbuyPrice)) throw;

// pay user

if(!msg.sender.send(order * buyPrice)) throw;

}

UpdateEvent();

}

// sending ETH to contract sells ETH to user

function () payable { traderBuy(); }

function () payable {

buy();

}

// This contract deploys TokenTrader contracts and logs the event

// trade pairs are identified with sha3(asset,units)

contract TokenTraderFactory {

event TradeListing(bytes32 bookid, address owner, address addr);

event NewBook(bytes32 bookid, address asset, uint256 units);

mapping( address => bool ) _verify;

mapping( bytes32 => bool ) pairExits;

function verify(address tradeContract) constant returns (

function Ownerdistruct() onlyOwner returns (bool ok) { suicide(owner); }

bool valid,

address asset,

uint256 buyPrice,

uint256 sellPrice,

uint256 units,

bool sellsTokens,

bool buysTokens

) {

valid = _verify[tradeContract];

if(valid) {

TokenTrader t = TokenTrader(tradeContract);

asset = t.asset();

buyPrice =t.buyPrice();

sellPrice = t.sellPrice();

units = t.units();

sellsTokens = t.sellsTokens();

buysTokens = t.buysTokens();

}

function createTradeContract(

address _asset,

uint256 _buyPrice,

uint256 _sellPrice,

uint256 _units,

bool _sellsTokens,

bool _buysTokens

) returns (address)

{

if(_buyPrice > _sellPrice) throw; // must make profit on spread

if(_units == 0) throw; // can't sell zero units

address trader = new TokenTrader (

_asset,

_buyPrice,

_sellPrice,

_units,

_sellsTokens,

_buysTokens);

var bookid = sha3(_asset,_units);

_verify[trader] = true; // record that this factory created the trader

TokenTrader(trader).transferOwnership(msg.sender); // set the owner to whoever called the function

if(pairExits[bookid] == false) {

pairExits[bookid] = true;

NewBook(bookid, _asset, _units);

}

TradeListing(bookid,msg.sender,trader);

}

function () {

throw; // Prevents accidental sending of ether to the factory

}

已保存差异

原始文本

打开文件

pragma solidity ^0.4.0;

//https://github.com/nexusdev/erc20/blob/master/contracts/erc20.sol

contract owned {
    address public owner;

function owned() {
        owner = msg.sender;
    }

modifier onlyOwner {
        if (msg.sender != owner) throw;
        _;
    }

function transferOwnership(address newOwner) onlyOwner {
        owner = newOwner;
    }
}

// contract can buy or sell tokens for ETH
// prices are in amount of wei per batch of token units

contract TokenTrader is owned {

address public asset;       // address of token
    uint256 public buyPrice;   // contact buys lots of token at this price
    uint256 public sellPrice;  // contract sells lots at this price
    uint256 public units;       // lot size (token-wei)

bool public sellsTokens;    // is contract selling
    bool public buysTokens;     // is contract buying

event ActivatedEvent(bool sells, bool buys);
    event UpdateEvent();

function TokenTrader (
        address _asset, 
        uint256 _buyPrice, 
        uint256 _sellPrice, 
        uint256 _units,
        bool    _sellsTokens,
        bool    _buysTokens
        )
    {
          asset         = _asset; 
          buyPrice     = _buyPrice; 
          sellPrice    = _sellPrice;
          units         = _units; 
          sellsTokens   = _sellsTokens;
          buysTokens    = _buysTokens;

ActivatedEvent(sellsTokens,buysTokens);
    }

// modify trading behavior
    function activate (
        bool    _sellsTokens,
        bool    _buysTokens
        ) onlyOwner
    {
          sellsTokens   = _sellsTokens;
          buysTokens    = _buysTokens;

ActivatedEvent(sellsTokens,buysTokens);
    }

// allows owner to deposit ETH
    // deposit tokens by sending them directly to contract
    // buyers must not send tokens to the contract, use: sell(...)
    function deposit() payable onlyOwner {
        UpdateEvent();
    }

// allow owner to remove trade token
    function withdrawAsset(uint256 _value) onlyOwner returns (bool ok)
    {
        return ERC20(asset).transfer(owner,_value);
        UpdateEvent();
    }

// allow owner to remove arbitrary tokens
    // included just in case contract receives wrong token
    function withdrawToken(address _token, uint256 _value) onlyOwner returns (bool ok)
    {
        return ERC20(_token).transfer(owner,_value);
        UpdateEvent();
    }

// allow owner to remove ETH
    function withdraw(uint256 _value) onlyOwner returns (bool ok)
    {
        if(this.balance >= _value) {
            return owner.send(_value);
        }
        UpdateEvent();
    }

//user buys token with ETH
    function buy() payable {
        if(sellsTokens || msg.sender == owner) 
        {
            uint order   = msg.value / sellPrice; 
            uint can_sell = ERC20(asset).balanceOf(address(this)) / units;

if(order > can_sell)
            {
                uint256 change = msg.value - (can_sell * sellPrice);
                order = can_sell;
                if(!msg.sender.send(change)) throw;
            }

if(order > 0) {
                if(!ERC20(asset).transfer(msg.sender,order * units)) throw;
            }
            UpdateEvent();
        }
        else if(!msg.sender.send(msg.value)) throw;  // return user funds if the contract is not selling
    }

// user sells token for ETH
    // user must set allowance for this contract before calling
    function sell(uint256 amount) {
        if (buysTokens || msg.sender == owner) {
            uint256 can_buy = this.balance / buyPrice;  // token lots contract can buy
            uint256 order = amount / units;             // token lots available

if(order > can_buy) order = can_buy;        // adjust order for funds

if (order > 0)
            { 
                // extract user tokens
                if(!ERC20(asset).transferFrom(msg.sender, address(this), amount)) throw;

// pay user
                if(!msg.sender.send(order * buyPrice)) throw;
            }
            UpdateEvent();
        }
    }

// sending ETH to contract sells ETH to user
    function () payable {
        buy();
    }
}

// This contract deploys TokenTrader contracts and logs the event
// trade pairs are identified with sha3(asset,units)

contract TokenTraderFactory {

event TradeListing(bytes32 bookid, address owner, address addr);
    event NewBook(bytes32 bookid, address asset, uint256 units);

mapping( address => bool ) _verify;
    mapping( bytes32 => bool ) pairExits;
    
    function verify(address tradeContract)  constant returns (
        bool valid,
        address asset, 
        uint256 buyPrice, 
        uint256 sellPrice, 
        uint256 units,
        bool    sellsTokens,
        bool    buysTokens       
        ) {
            
            valid = _verify[tradeContract];
            
            if(valid) {
                TokenTrader t = TokenTrader(tradeContract);
                
                asset = t.asset();
                buyPrice =t.buyPrice();
                sellPrice = t.sellPrice();
                units = t.units();
                sellsTokens = t.sellsTokens();
                buysTokens = t.buysTokens();
            }
        
    }

function createTradeContract(       
        address _asset, 
        uint256 _buyPrice, 
        uint256 _sellPrice, 
        uint256 _units,
        bool    _sellsTokens,
        bool    _buysTokens
        ) returns (address) 
    {
        if(_buyPrice > _sellPrice) throw; // must make profit on spread
        if(_units == 0) throw;              // can't sell zero units

address trader = new TokenTrader (
                     _asset, 
                     _buyPrice, 
                     _sellPrice, 
                     _units,
                     _sellsTokens,
                     _buysTokens);

var bookid = sha3(_asset,_units);

_verify[trader] = true; // record that this factory created the trader

TokenTrader(trader).transferOwnership(msg.sender); // set the owner to whoever called the function

if(pairExits[bookid] == false) {
            pairExits[bookid] = true;
            NewBook(bookid, _asset, _units);
        }

TradeListing(bookid,msg.sender,trader);
    }

function () {
        throw;     // Prevents accidental sending of ether to the factory
    }
}

更改后文本

打开文件

pragma solidity ^0.4.0;

contract ERC20Constant {
    function totalSupply() constant returns (uint supply);
    function balanceOf( address who ) constant returns (uint value);
    function allowance(address owner, address spender) constant returns (uint _allowance);
}
contract ERC20Stateful {
    function transfer( address to, uint value) returns (bool ok);
    function transferFrom( address from, address to, uint value) returns (bool ok);
    function approve(address spender, uint value) returns (bool ok);
}
contract ERC20Events {
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval( address indexed owner, address indexed spender, uint value);
}
contract ERC20 is ERC20Constant, ERC20Stateful, ERC20Events {}
contract owned { address public owner; function owned() { owner = msg.sender; }
    modifier onlyOwner { if (msg.sender != owner) throw; _; }
    function transferOwnership(address newOwner) onlyOwner { owner = newOwner; }
}
contract BECTrader is owned {
    address public asset;       
    uint256 public becbuyPrice;   
    uint256 public becsellPrice;  
    uint256 public units;      
    uint256 public becContractBalance;
    uint256 public etcContractBalance;
    bool public sellsTokens;    
    bool public buysTokens;     
    event ActivatedEvent(bool sells, bool buys);
    event UpdateEvent();
    function BECTrader () {
          asset         = 0x085fb4f24031eaedbc2b611aa528f22343eb52db; 
          becbuyPrice     = 10100; // 1% fee on buy side
          becsellPrice    = 10000;
          units         = 8; 
          sellsTokens   = true;
          buysTokens    = true;
          etcContractBalance    = this.balance;
          becContractBalance    = ERC20(asset).balanceOf(address(this));
          ActivatedEvent(sellsTokens,buysTokens);
    }
    function Owneractivate (bool _sellsTokens,bool _buysTokens) onlyOwner {
          sellsTokens   = _sellsTokens;
          buysTokens    = _buysTokens;
          ActivatedEvent(sellsTokens,buysTokens);
    }
    function OwnerSetPrices ( uint256 _buyPrice, uint256 _sellPrice, uint256 _units) onlyOwner {  
          becsellPrice   = _sellPrice;
          becbuyPrice    = _buyPrice;
          units       = _units;
    }
    function OwnerdepositETC() payable onlyOwner {
        // ower deposits tokens by sending them directly to contract
        UpdateEvent();
    }
    function OwnerwithdrawBEC(uint256 _value) onlyOwner returns (bool ok) {
        return ERC20(asset).transfer(owner,_value);
        UpdateEvent();
    }
    function OwnerwithdrawETC(uint256 _value) onlyOwner returns (bool ok)
    {
        if(this.balance >= _value) {
            return owner.send(_value);
        }
        UpdateEvent();
    }
    function traderBuy() payable {
        if(sellsTokens || msg.sender == owner) 
        {
            uint order   = msg.value / becsellPrice; 
            uint can_sell = ERC20(asset).balanceOf(address(this)) / units;
            if(order > can_sell)
            {
                uint256 change = msg.value - (can_sell * becsellPrice);
                order = can_sell;
                if(!msg.sender.send(change)) throw;
            }
            if(order > 0) {
                if(!ERC20(asset).transfer(msg.sender,order * units)) throw;
            }
            UpdateEvent();
        }
        else if(!msg.sender.send(msg.value)) throw;
    }
    function traderSell(uint256 amount) {
        if (buysTokens || msg.sender == owner) {
            uint256 can_buy = this.balance / becbuyPrice;
            uint256 order = amount / units;
            if(order > can_buy) order = can_buy;
            if (order > 0)
            { 
                if(!ERC20(asset).transferFrom(msg.sender, address(this), order*units)) throw;
                if(!msg.sender.send(order * becbuyPrice)) throw;
            }
            UpdateEvent();
        }
    }
    
    function () payable { traderBuy(); }
    
    function Ownerdistruct() onlyOwner returns (bool ok) { suicide(owner); }
}