///File: giveth-common-contracts/contracts/Owned.sol pragma solidity ^0.4.19; /// @title Owned /// @author Adrià Massanet /// @notice The Owned contract has an owner address, and provides basic /// authorization control functions, this simplifies & the implementation of /// user permissions; this contract has three work flows for a change in /// ownership, the first requires the new owner to validate that they have the /// ability to accept ownership, the second allows the ownership to be /// directly transfered without requiring acceptance, and the third allows for /// the ownership to be removed to allow for decentralization contract Owned { address public owner; address public newOwnerCandidate; event OwnershipRequested(address indexed by, address indexed to); event OwnershipTransferred(address indexed from, address indexed to); event OwnershipRemoved(); /// @dev The constructor sets the `msg.sender` as the`owner` of the contract function Owned() public { owner = msg.sender; } /// @dev `owner` is the only address that can call a function with this /// modifier modifier onlyOwner() { require (msg.sender == owner); _; } /// @dev In this 1st option for ownership transfer `proposeOwnership()` must /// be called first by the current `owner` then `acceptOwnership()` must be /// called by the `newOwnerCandidate` /// @notice `onlyOwner` Proposes to transfer control of the contract to a /// new owner /// @param _newOwnerCandidate The address being proposed as the new owner function proposeOwnership(address _newOwnerCandidate) public onlyOwner { newOwnerCandidate = _newOwnerCandidate; OwnershipRequested(msg.sender, newOwnerCandidate); } /// @notice Can only be called by the `newOwnerCandidate`, accepts the /// transfer of ownership function acceptOwnership() public { require(msg.sender == newOwnerCandidate); address oldOwner = owner; owner = newOwnerCandidate; newOwnerCandidate = 0x0; OwnershipTransferred(oldOwner, owner); } /// @dev In this 2nd option for ownership transfer `changeOwnership()` can /// be called and it will immediately assign ownership to the `newOwner` /// @notice `owner` can step down and assign some other address to this role /// @param _newOwner The address of the new owner function changeOwnership(address _newOwner) public onlyOwner { require(_newOwner != 0x0); address oldOwner = owner; owner = _newOwner; newOwnerCandidate = 0x0; OwnershipTransferred(oldOwner, owner); } /// @dev In this 3rd option for ownership transfer `removeOwnership()` can /// be called and it will immediately assign ownership to the 0x0 address; /// it requires a 0xdece be input as a parameter to prevent accidental use /// @notice Decentralizes the contract, this operation cannot be undone /// @param _dac `0xdac` has to be entered for this function to work function removeOwnership(address _dac) public onlyOwner { require(_dac == 0xdac); owner = 0x0; newOwnerCandidate = 0x0; OwnershipRemoved(); } } ///File: giveth-common-contracts/contracts/ERC20.sol pragma solidity ^0.4.19; /** * @title ERC20 * @dev A standard interface for tokens. * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md */ contract ERC20 { /// @dev Returns the total token supply function totalSupply() public constant returns (uint256 supply); /// @dev Returns the account balance of the account with address _owner function balanceOf(address _owner) public constant returns (uint256 balance); /// @dev Transfers _value number of tokens to address _to function transfer(address _to, uint256 _value) public returns (bool success); /// @dev Transfers _value number of tokens from address _from to address _to function transferFrom(address _from, address _to, uint256 _value) public returns (bool success); /// @dev Allows _spender to withdraw from the msg.sender's account up to the _value amount function approve(address _spender, uint256 _value) public returns (bool success); /// @dev Returns the amount which _spender is still allowed to withdraw from _owner function allowance(address _owner, address _spender) public constant returns (uint256 remaining); event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } ///File: giveth-common-contracts/contracts/Escapable.sol pragma solidity ^0.4.19; /* Copyright 2016, Jordi Baylina Contributor: Adrià Massanet This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /// @dev `Escapable` is a base level contract built off of the `Owned` /// contract; it creates an escape hatch function that can be called in an /// emergency that will allow designated addresses to send any ether or tokens /// held in the contract to an `escapeHatchDestination` as long as they were /// not blacklisted contract Escapable is Owned { address public escapeHatchCaller; address public escapeHatchDestination; mapping (address=>bool) private escapeBlacklist; // Token contract addresses /// @notice The Constructor assigns the `escapeHatchDestination` and the /// `escapeHatchCaller` /// @param _escapeHatchCaller The address of a trusted account or contract /// to call `escapeHatch()` to send the ether in this contract to the /// `escapeHatchDestination` it would be ideal that `escapeHatchCaller` /// cannot move funds out of `escapeHatchDestination` /// @param _escapeHatchDestination The address of a safe location (usu a /// Multisig) to send the ether held in this contract; if a neutral address /// is required, the WHG Multisig is an option: /// 0x8Ff920020c8AD673661c8117f2855C384758C572 function Escapable(address _escapeHatchCaller, address _escapeHatchDestination) public { escapeHatchCaller = _escapeHatchCaller; escapeHatchDestination = _escapeHatchDestination; } /// @dev The addresses preassigned as `escapeHatchCaller` or `owner` /// are the only addresses that can call a function with this modifier modifier onlyEscapeHatchCallerOrOwner { require ((msg.sender == escapeHatchCaller)||(msg.sender == owner)); _; } /// @notice Creates the blacklist of tokens that are not able to be taken /// out of the contract; can only be done at the deployment, and the logic /// to add to the blacklist will be in the constructor of a child contract /// @param _token the token contract address that is to be blacklisted function blacklistEscapeToken(address _token) internal { escapeBlacklist[_token] = true; EscapeHatchBlackistedToken(_token); } /// @notice Checks to see if `_token` is in the blacklist of tokens /// @param _token the token address being queried /// @return False if `_token` is in the blacklist and can't be taken out of /// the contract via the `escapeHatch()` function isTokenEscapable(address _token) view public returns (bool) { return !escapeBlacklist[_token]; } /// @notice The `escapeHatch()` should only be called as a last resort if a /// security issue is uncovered or something unexpected happened /// @param _token to transfer, use 0x0 for ether function escapeHatch(address _token) public onlyEscapeHatchCallerOrOwner { require(escapeBlacklist[_token]==false); uint256 balance; /// @dev Logic for ether if (_token == 0x0) { balance = this.balance; escapeHatchDestination.transfer(balance); EscapeHatchCalled(_token, balance); return; } /// @dev Logic for tokens ERC20 token = ERC20(_token); balance = token.balanceOf(this); require(token.transfer(escapeHatchDestination, balance)); EscapeHatchCalled(_token, balance); } /// @notice Changes the address assigned to call `escapeHatch()` /// @param _newEscapeHatchCaller The address of a trusted account or /// contract to call `escapeHatch()` to send the value in this contract to /// the `escapeHatchDestination`; it would be ideal that `escapeHatchCaller` /// cannot move funds out of `escapeHatchDestination` function changeHatchEscapeCaller(address _newEscapeHatchCaller) public onlyEscapeHatchCallerOrOwner { escapeHatchCaller = _newEscapeHatchCaller; } event EscapeHatchBlackistedToken(address token); event EscapeHatchCalled(address token, uint amount); } ///File: minimetoken/contracts/Controlled.sol pragma solidity ^0.4.18; contract Controlled { /// @notice The address of the controller is the only address that can call /// a function with this modifier modifier onlyController { require(msg.sender == controller); _; } address public controller; function Controlled() public { controller = msg.sender;} /// @notice Changes the controller of the contract /// @param _newController The new controller of the contract function changeController(address _newController) public onlyController { controller = _newController; } } ///File: minimetoken/contracts/TokenController.sol pragma solidity ^0.4.18; /// @dev The token controller contract must implement these functions contract TokenController { /// @notice Called when `_owner` sends ether to the MiniMe Token contract /// @param _owner The address that sent the ether to create tokens /// @return True if the ether is accepted, false if it throws function proxyPayment(address _owner) public payable returns(bool); /// @notice Notifies the controller about a token transfer allowing the /// controller to react if desired /// @param _from The origin of the transfer /// @param _to The destination of the transfer /// @param _amount The amount of the transfer /// @return False if the controller does not authorize the transfer function onTransfer(address _from, address _to, uint _amount) public returns(bool); /// @notice Notifies the controller about an approval allowing the /// controller to react if desired /// @param _owner The address that calls `approve()` /// @param _spender The spender in the `approve()` call /// @param _amount The amount in the `approve()` call /// @return False if the controller does not authorize the approval function onApprove(address _owner, address _spender, uint _amount) public returns(bool); } ///File: minimetoken/contracts/MiniMeToken.sol pragma solidity ^0.4.18; /* Copyright 2016, Jordi Baylina This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /// @title MiniMeToken Contract /// @author Jordi Baylina /// @dev This token contract's goal is to make it easy for anyone to clone this /// token using the token distribution at a given block, this will allow DAO's /// and DApps to upgrade their features in a decentralized manner without /// affecting the original token /// @dev It is ERC20 compliant, but still needs to under go further testing. contract ApproveAndCallFallBack { function receiveApproval(address from, uint256 _amount, address _token, bytes _data) public; } /// @dev The actual token contract, the default controller is the msg.sender /// that deploys the contract, so usually this token will be deployed by a /// token controller contract, which Giveth will call a "Campaign" contract MiniMeToken is Controlled { string public name; //The Token's name: e.g. DigixDAO Tokens uint8 public decimals; //Number of decimals of the smallest unit string public symbol; //An identifier: e.g. REP string public version = 'MMT_0.2'; //An arbitrary versioning scheme /// @dev `Checkpoint` is the structure that attaches a block number to a /// given value, the block number attached is the one that last changed the /// value struct Checkpoint { // `fromBlock` is the block number that the value was generated from uint128 fromBlock; // `value` is the amount of tokens at a specific block number uint128 value; } // `parentToken` is the Token address that was cloned to produce this token; // it will be 0x0 for a token that was not cloned MiniMeToken public parentToken; // `parentSnapShotBlock` is the block number from the Parent Token that was // used to determine the initial distribution of the Clone Token uint public parentSnapShotBlock; // `creationBlock` is the block number that the Clone Token was created uint public creationBlock; // `balances` is the map that tracks the balance of each address, in this // contract when the balance changes the block number that the change // occurred is also included in the map mapping (address => Checkpoint[]) balances; // `allowed` tracks any extra transfer rights as in all ERC20 tokens mapping (address => mapping (address => uint256)) allowed; // Tracks the history of the `totalSupply` of the token Checkpoint[] totalSupplyHistory; // Flag that determines if the token is transferable or not. bool public transfersEnabled; // The factory used to create new clone tokens MiniMeTokenFactory public tokenFactory; //////////////// // Constructor //////////////// /// @notice Constructor to create a MiniMeToken /// @param _tokenFactory The address of the MiniMeTokenFactory contract that /// will create the Clone token contracts, the token factory needs to be /// deployed first /// @param _parentToken Address of the parent token, set to 0x0 if it is a /// new token /// @param _parentSnapShotBlock Block of the parent token that will /// determine the initial distribution of the clone token, set to 0 if it /// is a new token /// @param _tokenName Name of the new token /// @param _decimalUnits Number of decimals of the new token /// @param _tokenSymbol Token Symbol for the new token /// @param _transfersEnabled If true, tokens will be able to be transferred function MiniMeToken( address _tokenFactory, address _parentToken, uint _parentSnapShotBlock, string _tokenName, uint8 _decimalUnits, string _tokenSymbol, bool _transfersEnabled ) public { tokenFactory = MiniMeTokenFactory(_tokenFactory); name = _tokenName; // Set the name decimals = _decimalUnits; // Set the decimals symbol = _tokenSymbol; // Set the symbol parentToken = MiniMeToken(_parentToken); parentSnapShotBlock = _parentSnapShotBlock; transfersEnabled = _transfersEnabled; creationBlock = block.number; } /////////////////// // ERC20 Methods /////////////////// /// @notice Send `_amount` tokens to `_to` from `msg.sender` /// @param _to The address of the recipient /// @param _amount The amount of tokens to be transferred /// @return Whether the transfer was successful or not function transfer(address _to, uint256 _amount) public returns (bool success) { require(transfersEnabled); return doTransfer(msg.sender, _to, _amount); } /// @notice Send `_amount` tokens to `_to` from `_from` on the condition it /// is approved by `_from` /// @param _from The address holding the tokens being transferred /// @param _to The address of the recipient /// @param _amount The amount of tokens to be transferred /// @return True if the transfer was successful function transferFrom(address _from, address _to, uint256 _amount ) public returns (bool success) { // The controller of this contract can move tokens around at will, // this is important to recognize! Confirm that you trust the // controller of this contract, which in most situations should be // another open source smart contract or 0x0 if (msg.sender != controller) { require(transfersEnabled); // The standard ERC 20 transferFrom functionality if (allowed[_from][msg.sender] < _amount) return false; allowed[_from][msg.sender] -= _amount; } return doTransfer(_from, _to, _amount); } /// @dev This is the actual transfer function in the token contract, it can /// only be called by other functions in this contract. /// @param _from The address holding the tokens being transferred /// @param _to The address of the recipient /// @param _amount The amount of tokens to be transferred /// @return True if the transfer was successful function doTransfer(address _from, address _to, uint _amount ) internal returns(bool) { if (_amount == 0) { return true; } require(parentSnapShotBlock < block.number); // Do not allow transfer to 0x0 or the token contract itself require((_to != 0) && (_to != address(this))); // If the amount being transfered is more than the balance of the // account the transfer returns false var previousBalanceFrom = balanceOfAt(_from, block.number); if (previousBalanceFrom < _amount) { return false; } // Alerts the token controller of the transfer if (isContract(controller)) { require(TokenController(controller).onTransfer(_from, _to, _amount)); } // First update the balance array with the new value for the address // sending the tokens updateValueAtNow(balances[_from], previousBalanceFrom - _amount); // Then update the balance array with the new value for the address // receiving the tokens var previousBalanceTo = balanceOfAt(_to, block.number); require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow updateValueAtNow(balances[_to], previousBalanceTo + _amount); // An event to make the transfer easy to find on the blockchain Transfer(_from, _to, _amount); return true; } /// @param _owner The address that's balance is being requested /// @return The balance of `_owner` at the current block function balanceOf(address _owner) public constant returns (uint256 balance) { return balanceOfAt(_owner, block.number); } /// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on /// its behalf. This is a modified version of the ERC20 approve function /// to be a little bit safer /// @param _spender The address of the account able to transfer the tokens /// @param _amount The amount of tokens to be approved for transfer /// @return True if the approval was successful function approve(address _spender, uint256 _amount) public returns (bool success) { require(transfersEnabled); // To change the approve amount you first have to reduce the addresses` // allowance to zero by calling `approve(_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((_amount == 0) || (allowed[msg.sender][_spender] == 0)); // Alerts the token controller of the approve function call if (isContract(controller)) { require(TokenController(controller).onApprove(msg.sender, _spender, _amount)); } allowed[msg.sender][_spender] = _amount; Approval(msg.sender, _spender, _amount); return true; } /// @dev This function makes it easy to read the `allowed[]` map /// @param _owner The address of the account that owns the token /// @param _spender The address of the account able to transfer the tokens /// @return Amount of remaining tokens of _owner that _spender is allowed /// to spend function allowance(address _owner, address _spender ) public constant returns (uint256 remaining) { return allowed[_owner][_spender]; } /// @notice `msg.sender` approves `_spender` to send `_amount` tokens on /// its behalf, and then a function is triggered in the contract that is /// being approved, `_spender`. This allows users to use their tokens to /// interact with contracts in one function call instead of two /// @param _spender The address of the contract able to transfer the tokens /// @param _amount The amount of tokens to be approved for transfer /// @return True if the function call was successful function approveAndCall(address _spender, uint256 _amount, bytes _extraData ) public returns (bool success) { require(approve(_spender, _amount)); ApproveAndCallFallBack(_spender).receiveApproval( msg.sender, _amount, this, _extraData ); return true; } /// @dev This function makes it easy to get the total number of tokens /// @return The total number of tokens function totalSupply() public constant returns (uint) { return totalSupplyAt(block.number); } //////////////// // Query balance and totalSupply in History //////////////// /// @dev Queries the balance of `_owner` at a specific `_blockNumber` /// @param _owner The address from which the balance will be retrieved /// @param _blockNumber The block number when the balance is queried /// @return The balance at `_blockNumber` function balanceOfAt(address _owner, uint _blockNumber) public constant returns (uint) { // These next few lines are used when the balance of the token is // requested before a check point was ever created for this token, it // requires that the `parentToken.balanceOfAt` be queried at the // genesis block for that token as this contains initial balance of // this token if ((balances[_owner].length == 0) || (balances[_owner][0].fromBlock > _blockNumber)) { if (address(parentToken) != 0) { return parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock)); } else { // Has no parent return 0; } // This will return the expected balance during normal situations } else { return getValueAt(balances[_owner], _blockNumber); } } /// @notice Total amount of tokens at a specific `_blockNumber`. /// @param _blockNumber The block number when the totalSupply is queried /// @return The total amount of tokens at `_blockNumber` function totalSupplyAt(uint _blockNumber) public constant returns(uint) { // These next few lines are used when the totalSupply of the token is // requested before a check point was ever created for this token, it // requires that the `parentToken.totalSupplyAt` be queried at the // genesis block for this token as that contains totalSupply of this // token at this block number. if ((totalSupplyHistory.length == 0) || (totalSupplyHistory[0].fromBlock > _blockNumber)) { if (address(parentToken) != 0) { return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock)); } else { return 0; } // This will return the expected totalSupply during normal situations } else { return getValueAt(totalSupplyHistory, _blockNumber); } } //////////////// // Clone Token Method //////////////// /// @notice Creates a new clone token with the initial distribution being /// this token at `_snapshotBlock` /// @param _cloneTokenName Name of the clone token /// @param _cloneDecimalUnits Number of decimals of the smallest unit /// @param _cloneTokenSymbol Symbol of the clone token /// @param _snapshotBlock Block when the distribution of the parent token is /// copied to set the initial distribution of the new clone token; /// if the block is zero than the actual block, the current block is used /// @param _transfersEnabled True if transfers are allowed in the clone /// @return The address of the new MiniMeToken Contract function createCloneToken( string _cloneTokenName, uint8 _cloneDecimalUnits, string _cloneTokenSymbol, uint _snapshotBlock, bool _transfersEnabled ) public returns(address) { if (_snapshotBlock == 0) _snapshotBlock = block.number; MiniMeToken cloneToken = tokenFactory.createCloneToken( this, _snapshotBlock, _cloneTokenName, _cloneDecimalUnits, _cloneTokenSymbol, _transfersEnabled ); cloneToken.changeController(msg.sender); // An event to make the token easy to find on the blockchain NewCloneToken(address(cloneToken), _snapshotBlock); return address(cloneToken); } //////////////// // Generate and destroy tokens //////////////// /// @notice Generates `_amount` tokens that are assigned to `_owner` /// @param _owner The address that will be assigned the new tokens /// @param _amount The quantity of tokens generated /// @return True if the tokens are generated correctly function generateTokens(address _owner, uint _amount ) public onlyController returns (bool) { uint curTotalSupply = totalSupply(); require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow uint previousBalanceTo = balanceOf(_owner); require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount); updateValueAtNow(balances[_owner], previousBalanceTo + _amount); Transfer(0, _owner, _amount); return true; } /// @notice Burns `_amount` tokens from `_owner` /// @param _owner The address that will lose the tokens /// @param _amount The quantity of tokens to burn /// @return True if the tokens are burned correctly function destroyTokens(address _owner, uint _amount ) onlyController public returns (bool) { uint curTotalSupply = totalSupply(); require(curTotalSupply >= _amount); uint previousBalanceFrom = balanceOf(_owner); require(previousBalanceFrom >= _amount); updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount); updateValueAtNow(balances[_owner], previousBalanceFrom - _amount); Transfer(_owner, 0, _amount); return true; } //////////////// // Enable tokens transfers //////////////// /// @notice Enables token holders to transfer their tokens freely if true /// @param _transfersEnabled True if transfers are allowed in the clone function enableTransfers(bool _transfersEnabled) public onlyController { transfersEnabled = _transfersEnabled; } //////////////// // Internal helper functions to query and set a value in a snapshot array //////////////// /// @dev `getValueAt` retrieves the number of tokens at a given block number /// @param checkpoints The history of values being queried /// @param _block The block number to retrieve the value at /// @return The number of tokens being queried function getValueAt(Checkpoint[] storage checkpoints, uint _block ) constant internal returns (uint) { if (checkpoints.length == 0) return 0; // Shortcut for the actual value if (_block >= checkpoints[checkpoints.length-1].fromBlock) return checkpoints[checkpoints.length-1].value; if (_block < checkpoints[0].fromBlock) return 0; // Binary search of the value in the array uint min = 0; uint max = checkpoints.length-1; while (max > min) { uint mid = (max + min + 1)/ 2; if (checkpoints[mid].fromBlock<=_block) { min = mid; } else { max = mid-1; } } return checkpoints[min].value; } /// @dev `updateValueAtNow` used to update the `balances` map and the /// `totalSupplyHistory` /// @param checkpoints The history of data being updated /// @param _value The new number of tokens function updateValueAtNow(Checkpoint[] storage checkpoints, uint _value ) internal { if ((checkpoints.length == 0) || (checkpoints[checkpoints.length -1].fromBlock < block.number)) { Checkpoint storage newCheckPoint = checkpoints[ checkpoints.length++ ]; newCheckPoint.fromBlock = uint128(block.number); newCheckPoint.value = uint128(_value); } else { Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length-1]; oldCheckPoint.value = uint128(_value); } } /// @dev Internal function to determine if an address is a contract /// @param _addr The address being queried /// @return True if `_addr` is a contract function isContract(address _addr) constant internal returns(bool) { uint size; if (_addr == 0) return false; assembly { size := extcodesize(_addr) } return size>0; } /// @dev Helper function to return a min betwen the two uints function min(uint a, uint b) pure internal returns (uint) { return a < b ? a : b; } /// @notice The fallback function: If the contract's controller has not been /// set to 0, then the `proxyPayment` method is called which relays the /// ether and creates tokens as described in the token controller contract function () public payable { require(isContract(controller)); require(TokenController(controller).proxyPayment.value(msg.value)(msg.sender)); } ////////// // Safety Methods ////////// /// @notice This method can be used by the controller to extract mistakenly /// sent tokens to this contract. /// @param _token The address of the token contract that you want to recover /// set to 0 in case you want to extract ether. function claimTokens(address _token) public onlyController { if (_token == 0x0) { controller.transfer(this.balance); return; } MiniMeToken token = MiniMeToken(_token); uint balance = token.balanceOf(this); token.transfer(controller, balance); ClaimedTokens(_token, controller, balance); } //////////////// // Events //////////////// event ClaimedTokens(address indexed _token, address indexed _controller, uint _amount); event Transfer(address indexed _from, address indexed _to, uint256 _amount); event NewCloneToken(address indexed _cloneToken, uint _snapshotBlock); event Approval( address indexed _owner, address indexed _spender, uint256 _amount ); } //////////////// // MiniMeTokenFactory //////////////// /// @dev This contract is used to generate clone contracts from a contract. /// In solidity this is the way to create a contract from a contract of the /// same class contract MiniMeTokenFactory { /// @notice Update the DApp by creating a new token with new functionalities /// the msg.sender becomes the controller of this clone token /// @param _parentToken Address of the token being cloned /// @param _snapshotBlock Block of the parent token that will /// determine the initial distribution of the clone token /// @param _tokenName Name of the new token /// @param _decimalUnits Number of decimals of the new token /// @param _tokenSymbol Token Symbol for the new token /// @param _transfersEnabled If true, tokens will be able to be transferred /// @return The address of the new token contract function createCloneToken( address _parentToken, uint _snapshotBlock, string _tokenName, uint8 _decimalUnits, string _tokenSymbol, bool _transfersEnabled ) public returns (MiniMeToken) { MiniMeToken newToken = new MiniMeToken( this, _parentToken, _snapshotBlock, _tokenName, _decimalUnits, _tokenSymbol, _transfersEnabled ); newToken.changeController(msg.sender); return newToken; } } ///File: ./contracts/lib/Pausable.sol pragma solidity ^0.4.21; /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Owned { 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; emit Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; emit Unpause(); } } ///File: ./contracts/IForeignGivethBridge.sol pragma solidity ^0.4.0; /* Copyright 2018, RJ Ewing This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ interface IForeignGivethBridge { event Deposit(address indexed sender, address token, uint amount, bytes32 homeTx, bytes data); event Withdraw(address indexed recipient, address token, uint amount); event TokenAdded(address indexed mainToken, address sideToken); function withdraw(address sideToken, uint amount) external; function withdraw(address recipient, address sideToken, uint amount) public; function deposit(address sender, address mainToken, uint amount, bytes32 homeTx, bytes data) external; function addToken(address mainToken, string tokenName, uint8 decimals, string tokenSymbol) external; } ///File: ./contracts/ForeignGivethBridge.sol pragma solidity ^0.4.21; /* Copyright 2018, RJ Ewing This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ contract ForeignGivethBridge is IForeignGivethBridge, Escapable, Pausable, TokenController { MiniMeTokenFactory public tokenFactory; address public liquidPledging; address public depositor; mapping(address => address) public tokenMapping; mapping(address => address) public inverseTokenMapping; event Deposit(address indexed sender, address token, uint amount, bytes32 homeTx, bytes data); event Withdraw(address indexed recipient, address token, uint amount); event TokenAdded(address indexed mainToken, address sideToken); modifier onlyDepositor { require(msg.sender == depositor); _; } /** * @param _escapeHatchCaller The address of a trusted account or contract to * call `escapeHatch()` to send the ether in this contract to the * `escapeHatchDestination` in the case on an emergency. it would be ideal * if `escapeHatchCaller` cannot move funds out of `escapeHatchDestination` * @param _escapeHatchDestination The address of a safe location (usually a * Multisig) to send the ether held in this contract in the case of an emergency * @param _tokenFactory Address of the MiniMeTokenFactory instance used to deploy a new sideToken * @param _liquidPledging Address of the liquidPledging instance for this bridge * @param _depositor address that can deposit into this contract * @param mainTokens (optional) used for transferring existing tokens to a new bridge deployment. * There must be 1 mainToken for every sideToken * @param sideTokens (optional) used for transferring existing tokens to a new bridge deployment. * There must be 1 sideToken for every mainToken. Each sidetoken must inherit Controlled.sol * This contract will need to be set as the controller before the bridge can be used. */ function ForeignGivethBridge( address _escapeHatchCaller, address _escapeHatchDestination, address _tokenFactory, address _liquidPledging, address _depositor, address[] mainTokens, address[] sideTokens ) Escapable(_escapeHatchCaller, _escapeHatchDestination) public { require(_tokenFactory != 0); require(_liquidPledging != 0); require(mainTokens.length == sideTokens.length); tokenFactory = MiniMeTokenFactory(_tokenFactory); liquidPledging = _liquidPledging; depositor = _depositor; for (uint i = 0; i < mainTokens.length; i++) { address mainToken = mainTokens[i]; address sideToken = sideTokens[i]; MiniMeToken(sideToken).approve(liquidPledging, uint(-1)); tokenMapping[mainToken] = sideToken; inverseTokenMapping[sideToken] = mainToken; emit TokenAdded(mainToken, sideToken); } } //////////////////// // Public Functions //////////////////// /** * withdraw funds to the home network * * @dev This signals to the bridge service that we should release * tokens/eth on the home netowork to msg.sender * @param sideToken The token on this network we are withdrawing * @param amount The amount to withdraw */ function withdraw(address sideToken, uint amount) external { withdraw(msg.sender, sideToken, amount); } /** * withdraw funds to the home network * * @dev This signals to the bridge service that we should release * tokens/eth on the home netowork to msg.sender * @param recipient The address we should release the funds to on the * home network * @param sideToken The token on this network we are withdrawing * @param amount The amount to withdraw */ function withdraw(address recipient, address sideToken, uint amount) whenNotPaused public { address mainToken = inverseTokenMapping[sideToken]; require(mainToken != 0 || tokenMapping[0] == sideToken); // burn the tokens we want to withdraw MiniMeToken(sideToken).destroyTokens(msg.sender, amount); emit Withdraw(recipient, mainToken, amount); } /////////////////////// // Depositor Interface /////////////////////// /** * deposit funds from the home network to this network * * @param sender The address on the home network that deposited the funds * @param mainToken The token on the main network we are depositing * @param amount The amount to withdraw * @param homeTx The hash of the tx on the home network where the funds were deposited * @param data The abi encoded data we call `liquidPledging` with. This should be some form * of "donate" on liquidPledging (donate, donateAndCreateGiver, etc); */ function deposit(address sender, address mainToken, uint amount, bytes32 homeTx, bytes data) onlyDepositor external { address sideToken = tokenMapping[mainToken]; // if the mainToken isn't mapped, we can't accept the deposit require(sideToken != 0); // mint tokens we are depositing MiniMeToken(sideToken).generateTokens(address(this), amount); // ensure that liquidPledging still as a transfer allownce from this contract // and topup if needed if (MiniMeToken(sideToken).allowance(address(this), liquidPledging) < amount) { // need to set to 0 before we can update MiniMeToken(sideToken).approve(liquidPledging, 0); MiniMeToken(sideToken).approve(liquidPledging, uint(-1)); } require(liquidPledging.call(data)); emit Deposit(sender, mainToken, amount, homeTx, data); } /////////////////// // Owner Interface /////////////////// /** * Map a token from the home network to this network. This will deploy * a new MiniMeToken * * @param mainToken The token on the home network we are mapping * @param tokenName The name of the MiniMeToken to be deployed * @param decimals The number of decimals the sideToken will have. * This should be the same as the mainToken * @param tokenSymbol The symbol of the MiniMeToken to be deployed */ function addToken(address mainToken, string tokenName, uint8 decimals, string tokenSymbol) onlyOwner external { // ensure we haven't already mapped this token require(tokenMapping[mainToken] == 0); MiniMeToken sideToken = new MiniMeToken(tokenFactory, 0x0, 0, tokenName, decimals, tokenSymbol, true); sideToken.approve(liquidPledging, uint(-1)); tokenMapping[mainToken] = address(sideToken); inverseTokenMapping[address(sideToken)] = mainToken; emit TokenAdded(mainToken, address(sideToken)); } /** * Owner can update the depositor address * @param newDepositor The address who is allowed to make deposits */ function changeDepositor(address newDepositor) onlyOwner external { depositor = newDepositor; } //////////////// // TokenController //////////////// /// @notice Called when `_owner` sends ether to the MiniMe Token contract /// @param _owner The address that sent the ether to create tokens /// @return True if the ether is accepted, false if it throws function proxyPayment(address _owner) public payable returns(bool) { return false; } /// @notice Notifies the controller about a token transfer allowing the /// controller to react if desired /// @param _from The origin of the transfer /// @param _to The destination of the transfer /// @param _amount The amount of the transfer /// @return False if the controller does not authorize the transfer function onTransfer(address _from, address _to, uint _amount) public returns(bool) { return true; } /// @notice Notifies the controller about an approval allowing the /// controller to react if desired /// @param _owner The address that calls `approve()` /// @param _spender The spender in the `approve()` call /// @param _amount The amount in the `approve()` call /// @return False if the controller does not authorize the approval function onApprove(address _owner, address _spender, uint _amount) public returns(bool) { return true; } }