Contract Name:
ColuLocalCurrency
Contract Source Code:
File 1 of 1 : ColuLocalCurrency
pragma solidity ^0.4.18;
// File: contracts/Ownable.sol
/// @title Ownable
/// @dev The Ownable contract has an owner address, and provides basic authorization control functions,
/// this simplifies the implementation of "user permissions".
/// @dev Based on OpenZeppelin's Ownable.
contract Ownable {
address public owner;
address public newOwnerCandidate;
event OwnershipRequested(address indexed by, address indexed to);
event OwnershipTransferred(address indexed from, address indexed to);
/// @dev Constructor sets the original `owner` of the contract to the sender account.
function Ownable() public {
owner = msg.sender;
}
/// @dev Reverts if called by any account other than the owner.
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
modifier onlyOwnerCandidate() {
require(msg.sender == newOwnerCandidate);
_;
}
/// @dev Proposes to transfer control of the contract to a newOwnerCandidate.
/// @param _newOwnerCandidate address The address to transfer ownership to.
function requestOwnershipTransfer(address _newOwnerCandidate) external onlyOwner {
require(_newOwnerCandidate != address(0));
newOwnerCandidate = _newOwnerCandidate;
OwnershipRequested(msg.sender, newOwnerCandidate);
}
/// @dev Accept ownership transfer. This method needs to be called by the perviously proposed owner.
function acceptOwnership() external onlyOwnerCandidate {
address previousOwner = owner;
owner = newOwnerCandidate;
newOwnerCandidate = address(0);
OwnershipTransferred(previousOwner, owner);
}
}
// File: contracts/SafeMath.sol
/// @title Math operations with safety checks
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
require(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// require(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// require(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) {
require(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
function max64(uint64 a, uint64 b) internal pure returns (uint64) {
return a >= b ? a : b;
}
function min64(uint64 a, uint64 b) internal pure returns (uint64) {
return a < b ? a : b;
}
function max256(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
function min256(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
function toPower2(uint256 a) internal pure returns (uint256) {
return mul(a, a);
}
function sqrt(uint256 a) internal pure returns (uint256) {
uint256 c = (a + 1) / 2;
uint256 b = a;
while (c < b) {
b = c;
c = (a / c + c) / 2;
}
return b;
}
}
// File: contracts/ERC20.sol
/// @title ERC Token Standard #20 Interface (https://github.com/ethereum/EIPs/issues/20)
contract ERC20 {
uint public totalSupply;
function balanceOf(address _owner) constant public returns (uint balance);
function transfer(address _to, uint _value) public returns (bool success);
function transferFrom(address _from, address _to, uint _value) public returns (bool success);
function approve(address _spender, uint _value) public returns (bool success);
function allowance(address _owner, address _spender) public constant returns (uint remaining);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
// File: contracts/BasicToken.sol
/// @title Basic ERC20 token contract implementation.
/// @dev Based on OpenZeppelin's StandardToken.
contract BasicToken is ERC20 {
using SafeMath for uint256;
uint256 public totalSupply;
mapping (address => mapping (address => uint256)) allowed;
mapping (address => uint256) balances;
event Approval(address indexed owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
/// @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
/// @param _spender address The address which will spend the funds.
/// @param _value uint256 The amount of tokens to be spent.
function approve(address _spender, uint256 _value) public returns (bool) {
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md#approve (see NOTE)
if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) {
revert();
}
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/// @dev Function to check the amount of tokens that 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 uint256 specifying the amount of tokens still available for the spender.
function allowance(address _owner, address _spender) constant public returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/// @dev Gets the balance of the specified address.
/// @param _owner address The address to query the the balance of.
/// @return uint256 representing the amount owned by the passed address.
function balanceOf(address _owner) constant public returns (uint256 balance) {
return balances[_owner];
}
/// @dev Transfer token to a specified address.
/// @param _to address The address to transfer to.
/// @param _value uint256 The amount to be transferred.
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
/// @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 uint256 the amount of tokens to be transferred.
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
uint256 _allowance = allowed[_from][msg.sender];
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}
}
// File: contracts/ERC223Receiver.sol
/// @title ERC223Receiver Interface
/// @dev Based on the specs form: https://github.com/ethereum/EIPs/issues/223
contract ERC223Receiver {
function tokenFallback(address _sender, uint _value, bytes _data) external returns (bool ok);
}
// File: contracts/ERC677.sol
/// @title ERC Token Standard #677 Interface (https://github.com/ethereum/EIPs/issues/677)
contract ERC677 is ERC20 {
function transferAndCall(address to, uint value, bytes data) public returns (bool ok);
event TransferAndCall(address indexed from, address indexed to, uint value, bytes data);
}
// File: contracts/Standard677Token.sol
/// @title Standard677Token implentation, base on https://github.com/ethereum/EIPs/issues/677
contract Standard677Token is ERC677, BasicToken {
/// @dev ERC223 safe token transfer from one address to another
/// @param _to address the address which you want to transfer to.
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function transferAndCall(address _to, uint _value, bytes _data) public returns (bool) {
require(super.transfer(_to, _value)); // do a normal token transfer
TransferAndCall(msg.sender, _to, _value, _data);
//filtering if the target is a contract with bytecode inside it
if (isContract(_to)) return contractFallback(_to, _value, _data);
return true;
}
/// @dev called when transaction target is a contract
/// @param _to address the address which you want to transfer to.
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function contractFallback(address _to, uint _value, bytes _data) private returns (bool) {
ERC223Receiver receiver = ERC223Receiver(_to);
require(receiver.tokenFallback(msg.sender, _value, _data));
return true;
}
/// @dev check if the address is contract
/// assemble the given address bytecode. If bytecode exists then the _addr is a contract.
/// @param _addr address the address to check
function isContract(address _addr) private constant returns (bool is_contract) {
// retrieve the size of the code on target address, this needs assembly
uint length;
assembly { length := extcodesize(_addr) }
return length > 0;
}
}
// File: contracts/TokenHolder.sol
/// @title Token holder contract.
contract TokenHolder is Ownable {
/// @dev Allow the owner to transfer out any accidentally sent ERC20 tokens.
/// @param _tokenAddress address The address of the ERC20 contract.
/// @param _amount uint256 The amount of tokens to be transferred.
function transferAnyERC20Token(address _tokenAddress, uint256 _amount) public onlyOwner returns (bool success) {
return ERC20(_tokenAddress).transfer(owner, _amount);
}
}
// File: contracts/ColuLocalCurrency.sol
/// @title Colu Local Currency contract.
/// @author Rotem Lev.
contract ColuLocalCurrency is Ownable, Standard677Token, TokenHolder {
using SafeMath for uint256;
string public name;
string public symbol;
uint8 public decimals;
string public tokenURI;
event TokenURIChanged(string newTokenURI);
/// @dev cotract to use when issuing a CC (Local Currency)
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function ColuLocalCurrency(string _name, string _symbol, uint8 _decimals, uint256 _totalSupply, string _tokenURI) public {
require(_totalSupply != 0);
require(bytes(_name).length != 0);
require(bytes(_symbol).length != 0);
totalSupply = _totalSupply;
name = _name;
symbol = _symbol;
decimals = _decimals;
tokenURI = _tokenURI;
balances[msg.sender] = totalSupply;
}
/// @dev Sets the tokenURI field, can be called by the owner only
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function setTokenURI(string _tokenURI) public onlyOwner {
tokenURI = _tokenURI;
TokenURIChanged(_tokenURI);
}
}
// File: contracts/Standard223Receiver.sol
/// @title Standard ERC223 Token Receiver implementing tokenFallback function and tokenPayable modifier
contract Standard223Receiver is ERC223Receiver {
Tkn tkn;
struct Tkn {
address addr;
address sender; // the transaction caller
uint256 value;
}
bool __isTokenFallback;
modifier tokenPayable {
require(__isTokenFallback);
_;
}
/// @dev Called when the receiver of transfer is contract
/// @param _sender address the address of tokens sender
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function tokenFallback(address _sender, uint _value, bytes _data) external returns (bool ok) {
if (!supportsToken(msg.sender)) {
return false;
}
// Problem: This will do a sstore which is expensive gas wise. Find a way to keep it in memory.
// Solution: Remove the the data
tkn = Tkn(msg.sender, _sender, _value);
__isTokenFallback = true;
if (!address(this).delegatecall(_data)) {
__isTokenFallback = false;
return false;
}
// avoid doing an overwrite to .token, which would be more expensive
// makes accessing .tkn values outside tokenPayable functions unsafe
__isTokenFallback = false;
return true;
}
function supportsToken(address token) public constant returns (bool);
}
// File: contracts/TokenOwnable.sol
/// @title TokenOwnable
/// @dev The TokenOwnable contract adds a onlyTokenOwner modifier as a tokenReceiver with ownable addaptation
contract TokenOwnable is Standard223Receiver, Ownable {
/// @dev Reverts if called by any account other than the owner for token sending.
modifier onlyTokenOwner() {
require(tkn.sender == owner);
_;
}
}
// File: contracts/EllipseMarketMaker.sol
/// @title Ellipse Market Maker contract.
/// @dev market maker, using ellipse equation.
/// @author Tal Beja.
contract EllipseMarketMaker is TokenOwnable {
// precision for price representation (as in ether or tokens).
uint256 public constant PRECISION = 10 ** 18;
// The tokens pair.
ERC20 public token1;
ERC20 public token2;
// The tokens reserves.
uint256 public R1;
uint256 public R2;
// The tokens full suplly.
uint256 public S1;
uint256 public S2;
// State flags.
bool public operational;
bool public openForPublic;
// Library contract address.
address public mmLib;
/// @dev Constructor calling the library contract using delegate.
function EllipseMarketMaker(address _mmLib, address _token1, address _token2) public {
require(_mmLib != address(0));
// Signature of the mmLib's constructor function
// bytes4 sig = bytes4(keccak256("constructor(address,address,address)"));
bytes4 sig = 0x6dd23b5b;
// 3 arguments of size 32
uint256 argsSize = 3 * 32;
// sig + arguments size
uint256 dataSize = 4 + argsSize;
bytes memory m_data = new bytes(dataSize);
assembly {
// Add the signature first to memory
mstore(add(m_data, 0x20), sig)
// Add the parameters
mstore(add(m_data, 0x24), _mmLib)
mstore(add(m_data, 0x44), _token1)
mstore(add(m_data, 0x64), _token2)
}
// delegatecall to the library contract
require(_mmLib.delegatecall(m_data));
}
/// @dev returns true iff token is supperted by this contract (for erc223/677 tokens calls)
/// @param token can be token1 or token2
function supportsToken(address token) public constant returns (bool) {
return (token1 == token || token2 == token);
}
/// @dev gets called when no other function matches, delegate to the lib contract.
function() public {
address _mmLib = mmLib;
if (msg.data.length > 0) {
assembly {
calldatacopy(0xff, 0, calldatasize)
let retVal := delegatecall(gas, _mmLib, 0xff, calldatasize, 0, 0x20)
switch retVal case 0 { revert(0,0) } default { return(0, 0x20) }
}
}
}
}
// File: contracts/MarketMaker.sol
/// @title Market Maker Interface.
/// @author Tal Beja.
contract MarketMaker is ERC223Receiver {
function getCurrentPrice() public constant returns (uint _price);
function change(address _fromToken, uint _amount, address _toToken) public returns (uint _returnAmount);
function change(address _fromToken, uint _amount, address _toToken, uint _minReturn) public returns (uint _returnAmount);
function change(address _toToken) public returns (uint _returnAmount);
function change(address _toToken, uint _minReturn) public returns (uint _returnAmount);
function quote(address _fromToken, uint _amount, address _toToken) public constant returns (uint _returnAmount);
function openForPublicTrade() public returns (bool success);
function isOpenForPublic() public returns (bool success);
event Change(address indexed fromToken, uint inAmount, address indexed toToken, uint returnAmount, address indexed account);
}
// File: contracts/IEllipseMarketMaker.sol
/// @title Ellipse Market Maker Interfase
/// @author Tal Beja
contract IEllipseMarketMaker is MarketMaker {
// precision for price representation (as in ether or tokens).
uint256 public constant PRECISION = 10 ** 18;
// The tokens pair.
ERC20 public token1;
ERC20 public token2;
// The tokens reserves.
uint256 public R1;
uint256 public R2;
// The tokens full suplly.
uint256 public S1;
uint256 public S2;
// State flags.
bool public operational;
bool public openForPublic;
// Library contract address.
address public mmLib;
function supportsToken(address token) public constant returns (bool);
function calcReserve(uint256 _R1, uint256 _S1, uint256 _S2) public pure returns (uint256);
function validateReserves() public view returns (bool);
function withdrawExcessReserves() public returns (uint256);
function initializeAfterTransfer() public returns (bool);
function initializeOnTransfer() public returns (bool);
function getPrice(uint256 _R1, uint256 _R2, uint256 _S1, uint256 _S2) public constant returns (uint256);
}
// File: contracts/CurrencyFactory.sol
/// @title Colu Local Currency + Market Maker factory contract.
/// @author Rotem Lev.
contract CurrencyFactory is Standard223Receiver, TokenHolder {
struct CurrencyStruct {
string name;
uint8 decimals;
uint256 totalSupply;
address owner;
address mmAddress;
}
// map of Market Maker owners: token address => currency struct
mapping (address => CurrencyStruct) public currencyMap;
// address of the deployed CLN contract (ERC20 Token)
address public clnAddress;
// address of the deployed elipse market maker contract
address public mmLibAddress;
address[] public tokens;
event MarketOpen(address indexed marketMaker);
event TokenCreated(address indexed token, address indexed owner);
// modifier to check if called by issuer of the token
modifier tokenIssuerOnly(address token, address owner) {
require(currencyMap[token].owner == owner);
_;
}
// modifier to only accept transferAndCall from CLN token
modifier CLNOnly() {
require(msg.sender == clnAddress);
_;
}
/// @dev checks if the instance of market maker contract is closed for public
/// @param _token address address of the CC token.
modifier marketClosed(address _token) {
require(!MarketMaker(currencyMap[_token].mmAddress).isOpenForPublic());
_;
}
/// @dev checks if the instance of market maker contract is open for public
/// @param _token address address of the CC token.
modifier marketOpen(address _token) {
require(MarketMaker(currencyMap[_token].mmAddress).isOpenForPublic());
_;
}
/// @dev constructor only reuires the address of the CLN token which must use the ERC20 interface
/// @param _mmLib address for the deployed market maker elipse contract
/// @param _clnAddress address for the deployed ERC20 CLN token
function CurrencyFactory(address _mmLib, address _clnAddress) public {
require(_mmLib != address(0));
require(_clnAddress != address(0));
mmLibAddress = _mmLib;
clnAddress = _clnAddress;
}
/// @dev create the MarketMaker and the CC token put all the CC token in the Market Maker reserve
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function createCurrency(string _name,
string _symbol,
uint8 _decimals,
uint256 _totalSupply,
string _tokenURI) public
returns (address) {
ColuLocalCurrency subToken = new ColuLocalCurrency(_name, _symbol, _decimals, _totalSupply, _tokenURI);
EllipseMarketMaker newMarketMaker = new EllipseMarketMaker(mmLibAddress, clnAddress, subToken);
//set allowance
require(subToken.transfer(newMarketMaker, _totalSupply));
require(IEllipseMarketMaker(newMarketMaker).initializeAfterTransfer());
currencyMap[subToken] = CurrencyStruct({ name: _name, decimals: _decimals, totalSupply: _totalSupply, mmAddress: newMarketMaker, owner: msg.sender});
tokens.push(subToken);
TokenCreated(subToken, msg.sender);
return subToken;
}
/// @dev create the MarketMaker and the CC token put all the CC token in the Market Maker reserve
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
function createCurrency(string _name,
string _symbol,
uint8 _decimals,
uint256 _totalSupply) public
returns (address) {
return createCurrency(_name, _symbol, _decimals, _totalSupply, '');
}
/// @dev normal send cln to the market maker contract, sender must approve() before calling method. can only be called by owner
/// @dev sending CLN will return CC from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
/// @param _clnAmount uint256 amount of CLN to transfer into the Market Maker reserve.
function insertCLNtoMarketMaker(address _token,
uint256 _clnAmount) public
tokenIssuerOnly(_token, msg.sender)
returns (uint256 _subTokenAmount) {
require(_clnAmount > 0);
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(clnAddress).transferFrom(msg.sender, this, _clnAmount));
require(ERC20(clnAddress).approve(marketMakerAddress, _clnAmount));
_subTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(clnAddress, _clnAmount, _token);
require(ERC20(_token).transfer(msg.sender, _subTokenAmount));
}
/// @dev ERC223 transferAndCall, send cln to the market maker contract can only be called by owner (see MarketMaker)
/// @dev sending CLN will return CC from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
function insertCLNtoMarketMaker(address _token) public
tokenPayable
CLNOnly
tokenIssuerOnly(_token, tkn.sender)
returns (uint256 _subTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(clnAddress).approve(marketMakerAddress, tkn.value));
_subTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(clnAddress, tkn.value, _token);
require(ERC20(_token).transfer(tkn.sender, _subTokenAmount));
}
/// @dev normal send cc to the market maker contract, sender must approve() before calling method. can only be called by owner
/// @dev sending CC will return CLN from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
/// @param _ccAmount uint256 amount of CC to transfer into the Market Maker reserve.
function extractCLNfromMarketMaker(address _token,
uint256 _ccAmount) public
tokenIssuerOnly(_token, msg.sender)
returns (uint256 _clnTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(_token).transferFrom(msg.sender, this, _ccAmount));
require(ERC20(_token).approve(marketMakerAddress, _ccAmount));
_clnTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(_token, _ccAmount, clnAddress);
require(ERC20(clnAddress).transfer(msg.sender, _clnTokenAmount));
}
/// @dev ERC223 transferAndCall, send CC to the market maker contract can only be called by owner (see MarketMaker)
/// @dev sending CC will return CLN from the reserve to the sender.
function extractCLNfromMarketMaker() public
tokenPayable
tokenIssuerOnly(msg.sender, tkn.sender)
returns (uint256 _clnTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(msg.sender);
require(ERC20(msg.sender).approve(marketMakerAddress, tkn.value));
_clnTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(msg.sender, tkn.value, clnAddress);
require(ERC20(clnAddress).transfer(tkn.sender, _clnTokenAmount));
}
/// @dev opens the Market Maker to recvice transactions from all sources.
/// @dev Request to transfer ownership of Market Maker contract to Owner instead of factory.
/// @param _token address address of the cc token managed by this factory.
function openMarket(address _token) public
tokenIssuerOnly(_token, msg.sender)
returns (bool) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(MarketMaker(marketMakerAddress).openForPublicTrade());
Ownable(marketMakerAddress).requestOwnershipTransfer(msg.sender);
Ownable(_token).requestOwnershipTransfer(msg.sender);
MarketOpen(marketMakerAddress);
return true;
}
/// @dev implementation for standard 223 reciver.
/// @param _token address of the token used with transferAndCall.
function supportsToken(address _token) public constant returns (bool) {
return (clnAddress == _token || currencyMap[_token].totalSupply > 0);
}
/// @dev sets tokenURI for the given currency, can be used during the sell only
/// @param _token address address of the token to update
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function setTokenURI(address _token, string _tokenURI) public
tokenIssuerOnly(_token, msg.sender)
marketClosed(_token)
returns (bool) {
ColuLocalCurrency(_token).setTokenURI(_tokenURI);
return true;
}
/// @dev helper function to get the market maker address form token
/// @param _token address of the token used with transferAndCall.
function getMarketMakerAddressFromToken(address _token) public constant returns (address _marketMakerAddress) {
_marketMakerAddress = currencyMap[_token].mmAddress;
require(_marketMakerAddress != address(0));
}
}
Contract Name:
ColuLocalCurrency
Contract Source Code:
File 1 of 1 : ColuLocalCurrency
pragma solidity ^0.4.18;
// File: contracts/Ownable.sol
/// @title Ownable
/// @dev The Ownable contract has an owner address, and provides basic authorization control functions,
/// this simplifies the implementation of "user permissions".
/// @dev Based on OpenZeppelin's Ownable.
contract Ownable {
address public owner;
address public newOwnerCandidate;
event OwnershipRequested(address indexed by, address indexed to);
event OwnershipTransferred(address indexed from, address indexed to);
/// @dev Constructor sets the original `owner` of the contract to the sender account.
function Ownable() public {
owner = msg.sender;
}
/// @dev Reverts if called by any account other than the owner.
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
modifier onlyOwnerCandidate() {
require(msg.sender == newOwnerCandidate);
_;
}
/// @dev Proposes to transfer control of the contract to a newOwnerCandidate.
/// @param _newOwnerCandidate address The address to transfer ownership to.
function requestOwnershipTransfer(address _newOwnerCandidate) external onlyOwner {
require(_newOwnerCandidate != address(0));
newOwnerCandidate = _newOwnerCandidate;
OwnershipRequested(msg.sender, newOwnerCandidate);
}
/// @dev Accept ownership transfer. This method needs to be called by the perviously proposed owner.
function acceptOwnership() external onlyOwnerCandidate {
address previousOwner = owner;
owner = newOwnerCandidate;
newOwnerCandidate = address(0);
OwnershipTransferred(previousOwner, owner);
}
}
// File: contracts/SafeMath.sol
/// @title Math operations with safety checks
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
require(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// require(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// require(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) {
require(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
function max64(uint64 a, uint64 b) internal pure returns (uint64) {
return a >= b ? a : b;
}
function min64(uint64 a, uint64 b) internal pure returns (uint64) {
return a < b ? a : b;
}
function max256(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
function min256(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
function toPower2(uint256 a) internal pure returns (uint256) {
return mul(a, a);
}
function sqrt(uint256 a) internal pure returns (uint256) {
uint256 c = (a + 1) / 2;
uint256 b = a;
while (c < b) {
b = c;
c = (a / c + c) / 2;
}
return b;
}
}
// File: contracts/ERC20.sol
/// @title ERC Token Standard #20 Interface (https://github.com/ethereum/EIPs/issues/20)
contract ERC20 {
uint public totalSupply;
function balanceOf(address _owner) constant public returns (uint balance);
function transfer(address _to, uint _value) public returns (bool success);
function transferFrom(address _from, address _to, uint _value) public returns (bool success);
function approve(address _spender, uint _value) public returns (bool success);
function allowance(address _owner, address _spender) public constant returns (uint remaining);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
// File: contracts/BasicToken.sol
/// @title Basic ERC20 token contract implementation.
/// @dev Based on OpenZeppelin's StandardToken.
contract BasicToken is ERC20 {
using SafeMath for uint256;
uint256 public totalSupply;
mapping (address => mapping (address => uint256)) allowed;
mapping (address => uint256) balances;
event Approval(address indexed owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
/// @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
/// @param _spender address The address which will spend the funds.
/// @param _value uint256 The amount of tokens to be spent.
function approve(address _spender, uint256 _value) public returns (bool) {
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md#approve (see NOTE)
if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) {
revert();
}
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/// @dev Function to check the amount of tokens that 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 uint256 specifying the amount of tokens still available for the spender.
function allowance(address _owner, address _spender) constant public returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/// @dev Gets the balance of the specified address.
/// @param _owner address The address to query the the balance of.
/// @return uint256 representing the amount owned by the passed address.
function balanceOf(address _owner) constant public returns (uint256 balance) {
return balances[_owner];
}
/// @dev Transfer token to a specified address.
/// @param _to address The address to transfer to.
/// @param _value uint256 The amount to be transferred.
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
/// @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 uint256 the amount of tokens to be transferred.
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
uint256 _allowance = allowed[_from][msg.sender];
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}
}
// File: contracts/ERC223Receiver.sol
/// @title ERC223Receiver Interface
/// @dev Based on the specs form: https://github.com/ethereum/EIPs/issues/223
contract ERC223Receiver {
function tokenFallback(address _sender, uint _value, bytes _data) external returns (bool ok);
}
// File: contracts/ERC677.sol
/// @title ERC Token Standard #677 Interface (https://github.com/ethereum/EIPs/issues/677)
contract ERC677 is ERC20 {
function transferAndCall(address to, uint value, bytes data) public returns (bool ok);
event TransferAndCall(address indexed from, address indexed to, uint value, bytes data);
}
// File: contracts/Standard677Token.sol
/// @title Standard677Token implentation, base on https://github.com/ethereum/EIPs/issues/677
contract Standard677Token is ERC677, BasicToken {
/// @dev ERC223 safe token transfer from one address to another
/// @param _to address the address which you want to transfer to.
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function transferAndCall(address _to, uint _value, bytes _data) public returns (bool) {
require(super.transfer(_to, _value)); // do a normal token transfer
TransferAndCall(msg.sender, _to, _value, _data);
//filtering if the target is a contract with bytecode inside it
if (isContract(_to)) return contractFallback(_to, _value, _data);
return true;
}
/// @dev called when transaction target is a contract
/// @param _to address the address which you want to transfer to.
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function contractFallback(address _to, uint _value, bytes _data) private returns (bool) {
ERC223Receiver receiver = ERC223Receiver(_to);
require(receiver.tokenFallback(msg.sender, _value, _data));
return true;
}
/// @dev check if the address is contract
/// assemble the given address bytecode. If bytecode exists then the _addr is a contract.
/// @param _addr address the address to check
function isContract(address _addr) private constant returns (bool is_contract) {
// retrieve the size of the code on target address, this needs assembly
uint length;
assembly { length := extcodesize(_addr) }
return length > 0;
}
}
// File: contracts/TokenHolder.sol
/// @title Token holder contract.
contract TokenHolder is Ownable {
/// @dev Allow the owner to transfer out any accidentally sent ERC20 tokens.
/// @param _tokenAddress address The address of the ERC20 contract.
/// @param _amount uint256 The amount of tokens to be transferred.
function transferAnyERC20Token(address _tokenAddress, uint256 _amount) public onlyOwner returns (bool success) {
return ERC20(_tokenAddress).transfer(owner, _amount);
}
}
// File: contracts/ColuLocalCurrency.sol
/// @title Colu Local Currency contract.
/// @author Rotem Lev.
contract ColuLocalCurrency is Ownable, Standard677Token, TokenHolder {
using SafeMath for uint256;
string public name;
string public symbol;
uint8 public decimals;
string public tokenURI;
event TokenURIChanged(string newTokenURI);
/// @dev cotract to use when issuing a CC (Local Currency)
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function ColuLocalCurrency(string _name, string _symbol, uint8 _decimals, uint256 _totalSupply, string _tokenURI) public {
require(_totalSupply != 0);
require(bytes(_name).length != 0);
require(bytes(_symbol).length != 0);
totalSupply = _totalSupply;
name = _name;
symbol = _symbol;
decimals = _decimals;
tokenURI = _tokenURI;
balances[msg.sender] = totalSupply;
}
/// @dev Sets the tokenURI field, can be called by the owner only
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function setTokenURI(string _tokenURI) public onlyOwner {
tokenURI = _tokenURI;
TokenURIChanged(_tokenURI);
}
}
// File: contracts/Standard223Receiver.sol
/// @title Standard ERC223 Token Receiver implementing tokenFallback function and tokenPayable modifier
contract Standard223Receiver is ERC223Receiver {
Tkn tkn;
struct Tkn {
address addr;
address sender; // the transaction caller
uint256 value;
}
bool __isTokenFallback;
modifier tokenPayable {
require(__isTokenFallback);
_;
}
/// @dev Called when the receiver of transfer is contract
/// @param _sender address the address of tokens sender
/// @param _value uint256 the amount of tokens to be transferred.
/// @param _data bytes data that can be attached to the token transation
function tokenFallback(address _sender, uint _value, bytes _data) external returns (bool ok) {
if (!supportsToken(msg.sender)) {
return false;
}
// Problem: This will do a sstore which is expensive gas wise. Find a way to keep it in memory.
// Solution: Remove the the data
tkn = Tkn(msg.sender, _sender, _value);
__isTokenFallback = true;
if (!address(this).delegatecall(_data)) {
__isTokenFallback = false;
return false;
}
// avoid doing an overwrite to .token, which would be more expensive
// makes accessing .tkn values outside tokenPayable functions unsafe
__isTokenFallback = false;
return true;
}
function supportsToken(address token) public constant returns (bool);
}
// File: contracts/TokenOwnable.sol
/// @title TokenOwnable
/// @dev The TokenOwnable contract adds a onlyTokenOwner modifier as a tokenReceiver with ownable addaptation
contract TokenOwnable is Standard223Receiver, Ownable {
/// @dev Reverts if called by any account other than the owner for token sending.
modifier onlyTokenOwner() {
require(tkn.sender == owner);
_;
}
}
// File: contracts/EllipseMarketMaker.sol
/// @title Ellipse Market Maker contract.
/// @dev market maker, using ellipse equation.
/// @author Tal Beja.
contract EllipseMarketMaker is TokenOwnable {
// precision for price representation (as in ether or tokens).
uint256 public constant PRECISION = 10 ** 18;
// The tokens pair.
ERC20 public token1;
ERC20 public token2;
// The tokens reserves.
uint256 public R1;
uint256 public R2;
// The tokens full suplly.
uint256 public S1;
uint256 public S2;
// State flags.
bool public operational;
bool public openForPublic;
// Library contract address.
address public mmLib;
/// @dev Constructor calling the library contract using delegate.
function EllipseMarketMaker(address _mmLib, address _token1, address _token2) public {
require(_mmLib != address(0));
// Signature of the mmLib's constructor function
// bytes4 sig = bytes4(keccak256("constructor(address,address,address)"));
bytes4 sig = 0x6dd23b5b;
// 3 arguments of size 32
uint256 argsSize = 3 * 32;
// sig + arguments size
uint256 dataSize = 4 + argsSize;
bytes memory m_data = new bytes(dataSize);
assembly {
// Add the signature first to memory
mstore(add(m_data, 0x20), sig)
// Add the parameters
mstore(add(m_data, 0x24), _mmLib)
mstore(add(m_data, 0x44), _token1)
mstore(add(m_data, 0x64), _token2)
}
// delegatecall to the library contract
require(_mmLib.delegatecall(m_data));
}
/// @dev returns true iff token is supperted by this contract (for erc223/677 tokens calls)
/// @param token can be token1 or token2
function supportsToken(address token) public constant returns (bool) {
return (token1 == token || token2 == token);
}
/// @dev gets called when no other function matches, delegate to the lib contract.
function() public {
address _mmLib = mmLib;
if (msg.data.length > 0) {
assembly {
calldatacopy(0xff, 0, calldatasize)
let retVal := delegatecall(gas, _mmLib, 0xff, calldatasize, 0, 0x20)
switch retVal case 0 { revert(0,0) } default { return(0, 0x20) }
}
}
}
}
// File: contracts/MarketMaker.sol
/// @title Market Maker Interface.
/// @author Tal Beja.
contract MarketMaker is ERC223Receiver {
function getCurrentPrice() public constant returns (uint _price);
function change(address _fromToken, uint _amount, address _toToken) public returns (uint _returnAmount);
function change(address _fromToken, uint _amount, address _toToken, uint _minReturn) public returns (uint _returnAmount);
function change(address _toToken) public returns (uint _returnAmount);
function change(address _toToken, uint _minReturn) public returns (uint _returnAmount);
function quote(address _fromToken, uint _amount, address _toToken) public constant returns (uint _returnAmount);
function openForPublicTrade() public returns (bool success);
function isOpenForPublic() public returns (bool success);
event Change(address indexed fromToken, uint inAmount, address indexed toToken, uint returnAmount, address indexed account);
}
// File: contracts/IEllipseMarketMaker.sol
/// @title Ellipse Market Maker Interfase
/// @author Tal Beja
contract IEllipseMarketMaker is MarketMaker {
// precision for price representation (as in ether or tokens).
uint256 public constant PRECISION = 10 ** 18;
// The tokens pair.
ERC20 public token1;
ERC20 public token2;
// The tokens reserves.
uint256 public R1;
uint256 public R2;
// The tokens full suplly.
uint256 public S1;
uint256 public S2;
// State flags.
bool public operational;
bool public openForPublic;
// Library contract address.
address public mmLib;
function supportsToken(address token) public constant returns (bool);
function calcReserve(uint256 _R1, uint256 _S1, uint256 _S2) public pure returns (uint256);
function validateReserves() public view returns (bool);
function withdrawExcessReserves() public returns (uint256);
function initializeAfterTransfer() public returns (bool);
function initializeOnTransfer() public returns (bool);
function getPrice(uint256 _R1, uint256 _R2, uint256 _S1, uint256 _S2) public constant returns (uint256);
}
// File: contracts/CurrencyFactory.sol
/// @title Colu Local Currency + Market Maker factory contract.
/// @author Rotem Lev.
contract CurrencyFactory is Standard223Receiver, TokenHolder {
struct CurrencyStruct {
string name;
uint8 decimals;
uint256 totalSupply;
address owner;
address mmAddress;
}
// map of Market Maker owners: token address => currency struct
mapping (address => CurrencyStruct) public currencyMap;
// address of the deployed CLN contract (ERC20 Token)
address public clnAddress;
// address of the deployed elipse market maker contract
address public mmLibAddress;
address[] public tokens;
event MarketOpen(address indexed marketMaker);
event TokenCreated(address indexed token, address indexed owner);
// modifier to check if called by issuer of the token
modifier tokenIssuerOnly(address token, address owner) {
require(currencyMap[token].owner == owner);
_;
}
// modifier to only accept transferAndCall from CLN token
modifier CLNOnly() {
require(msg.sender == clnAddress);
_;
}
/// @dev checks if the instance of market maker contract is closed for public
/// @param _token address address of the CC token.
modifier marketClosed(address _token) {
require(!MarketMaker(currencyMap[_token].mmAddress).isOpenForPublic());
_;
}
/// @dev checks if the instance of market maker contract is open for public
/// @param _token address address of the CC token.
modifier marketOpen(address _token) {
require(MarketMaker(currencyMap[_token].mmAddress).isOpenForPublic());
_;
}
/// @dev constructor only reuires the address of the CLN token which must use the ERC20 interface
/// @param _mmLib address for the deployed market maker elipse contract
/// @param _clnAddress address for the deployed ERC20 CLN token
function CurrencyFactory(address _mmLib, address _clnAddress) public {
require(_mmLib != address(0));
require(_clnAddress != address(0));
mmLibAddress = _mmLib;
clnAddress = _clnAddress;
}
/// @dev create the MarketMaker and the CC token put all the CC token in the Market Maker reserve
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function createCurrency(string _name,
string _symbol,
uint8 _decimals,
uint256 _totalSupply,
string _tokenURI) public
returns (address) {
ColuLocalCurrency subToken = new ColuLocalCurrency(_name, _symbol, _decimals, _totalSupply, _tokenURI);
EllipseMarketMaker newMarketMaker = new EllipseMarketMaker(mmLibAddress, clnAddress, subToken);
//set allowance
require(subToken.transfer(newMarketMaker, _totalSupply));
require(IEllipseMarketMaker(newMarketMaker).initializeAfterTransfer());
currencyMap[subToken] = CurrencyStruct({ name: _name, decimals: _decimals, totalSupply: _totalSupply, mmAddress: newMarketMaker, owner: msg.sender});
tokens.push(subToken);
TokenCreated(subToken, msg.sender);
return subToken;
}
/// @dev create the MarketMaker and the CC token put all the CC token in the Market Maker reserve
/// @param _name string name for CC token that is created.
/// @param _symbol string symbol for CC token that is created.
/// @param _decimals uint8 percison for CC token that is created.
/// @param _totalSupply uint256 total supply of the CC token that is created.
function createCurrency(string _name,
string _symbol,
uint8 _decimals,
uint256 _totalSupply) public
returns (address) {
return createCurrency(_name, _symbol, _decimals, _totalSupply, '');
}
/// @dev normal send cln to the market maker contract, sender must approve() before calling method. can only be called by owner
/// @dev sending CLN will return CC from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
/// @param _clnAmount uint256 amount of CLN to transfer into the Market Maker reserve.
function insertCLNtoMarketMaker(address _token,
uint256 _clnAmount) public
tokenIssuerOnly(_token, msg.sender)
returns (uint256 _subTokenAmount) {
require(_clnAmount > 0);
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(clnAddress).transferFrom(msg.sender, this, _clnAmount));
require(ERC20(clnAddress).approve(marketMakerAddress, _clnAmount));
_subTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(clnAddress, _clnAmount, _token);
require(ERC20(_token).transfer(msg.sender, _subTokenAmount));
}
/// @dev ERC223 transferAndCall, send cln to the market maker contract can only be called by owner (see MarketMaker)
/// @dev sending CLN will return CC from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
function insertCLNtoMarketMaker(address _token) public
tokenPayable
CLNOnly
tokenIssuerOnly(_token, tkn.sender)
returns (uint256 _subTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(clnAddress).approve(marketMakerAddress, tkn.value));
_subTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(clnAddress, tkn.value, _token);
require(ERC20(_token).transfer(tkn.sender, _subTokenAmount));
}
/// @dev normal send cc to the market maker contract, sender must approve() before calling method. can only be called by owner
/// @dev sending CC will return CLN from the reserve to the sender.
/// @param _token address address of the cc token managed by this factory.
/// @param _ccAmount uint256 amount of CC to transfer into the Market Maker reserve.
function extractCLNfromMarketMaker(address _token,
uint256 _ccAmount) public
tokenIssuerOnly(_token, msg.sender)
returns (uint256 _clnTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(ERC20(_token).transferFrom(msg.sender, this, _ccAmount));
require(ERC20(_token).approve(marketMakerAddress, _ccAmount));
_clnTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(_token, _ccAmount, clnAddress);
require(ERC20(clnAddress).transfer(msg.sender, _clnTokenAmount));
}
/// @dev ERC223 transferAndCall, send CC to the market maker contract can only be called by owner (see MarketMaker)
/// @dev sending CC will return CLN from the reserve to the sender.
function extractCLNfromMarketMaker() public
tokenPayable
tokenIssuerOnly(msg.sender, tkn.sender)
returns (uint256 _clnTokenAmount) {
address marketMakerAddress = getMarketMakerAddressFromToken(msg.sender);
require(ERC20(msg.sender).approve(marketMakerAddress, tkn.value));
_clnTokenAmount = IEllipseMarketMaker(marketMakerAddress).change(msg.sender, tkn.value, clnAddress);
require(ERC20(clnAddress).transfer(tkn.sender, _clnTokenAmount));
}
/// @dev opens the Market Maker to recvice transactions from all sources.
/// @dev Request to transfer ownership of Market Maker contract to Owner instead of factory.
/// @param _token address address of the cc token managed by this factory.
function openMarket(address _token) public
tokenIssuerOnly(_token, msg.sender)
returns (bool) {
address marketMakerAddress = getMarketMakerAddressFromToken(_token);
require(MarketMaker(marketMakerAddress).openForPublicTrade());
Ownable(marketMakerAddress).requestOwnershipTransfer(msg.sender);
Ownable(_token).requestOwnershipTransfer(msg.sender);
MarketOpen(marketMakerAddress);
return true;
}
/// @dev implementation for standard 223 reciver.
/// @param _token address of the token used with transferAndCall.
function supportsToken(address _token) public constant returns (bool) {
return (clnAddress == _token || currencyMap[_token].totalSupply > 0);
}
/// @dev sets tokenURI for the given currency, can be used during the sell only
/// @param _token address address of the token to update
/// @param _tokenURI string the URI may point to a JSON file that conforms to the "Metadata JSON Schema".
function setTokenURI(address _token, string _tokenURI) public
tokenIssuerOnly(_token, msg.sender)
marketClosed(_token)
returns (bool) {
ColuLocalCurrency(_token).setTokenURI(_tokenURI);
return true;
}
/// @dev helper function to get the market maker address form token
/// @param _token address of the token used with transferAndCall.
function getMarketMakerAddressFromToken(address _token) public constant returns (address _marketMakerAddress) {
_marketMakerAddress = currencyMap[_token].mmAddress;
require(_marketMakerAddress != address(0));
}
}
Context size (optional):