2016-11-11 11:36:50 +00:00
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pragma solidity ^0.4.4;
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2016-11-08 13:18:27 +00:00
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/*
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2016-11-10 09:51:02 +00:00
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Copyright 2016, Jordi Baylina
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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2016-11-08 13:18:27 +00:00
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*/
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2016-11-11 11:36:50 +00:00
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/// @title MiniMeToken Contract
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2016-11-11 10:24:16 +00:00
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/// @author Jordi Baylina
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2016-11-11 11:36:50 +00:00
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/// @dev This token contract's goal is to make it easy to clone this token to
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/// spawn child tokens using the token distribution at a given block.
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/// @dev It is ERC20 compliant, but still needs to under go further testing.
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2016-11-10 13:54:33 +00:00
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2016-11-08 13:12:24 +00:00
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2016-11-11 13:54:42 +00:00
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contract Controlled {
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/// @notice The address of the controller is the only address that can call a
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/// function with this modifier
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modifier onlyController { if (msg.sender != controller) throw; _; }
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address public controller;
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function Controlled() { controller = msg.sender;}
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/// @notice Changes the controller of the contract
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/// @param _newController The new controller of the contract
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function changeController(address _newController) onlyController {
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controller = _newController;
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}
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}
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2016-11-09 17:09:56 +00:00
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contract TokenCreation {
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function proxyPayment(address _owner) payable returns(bool);
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}
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2016-11-11 13:54:42 +00:00
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contract MiniMeToken is Controlled {
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string public name; //The Token's name: e.g. DigixDAO Tokens
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uint8 public decimals; //Number of decimals of the smallest unit
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string public symbol; //An identifier: e.g. REP
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string public version = 'MMT_0.1'; //An arbitrary versioning scheme.
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/// @dev `Checkpoint` is the structure that attaches a block number to the a
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/// given token attribute
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struct Checkpoint {
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// `fromBlock` is the block number that the value was generated from
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uint fromBlock;
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// `value` is the amount of tokens at a specific block number
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uint value;
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}
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// `parentToken` is the Token address that was cloned. 0x0 for a root token
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MiniMeToken public parentToken;
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// `parentSnapShotBlock` is the Block number from the Parent Token that was
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// used to determine the initial distribution of the Cloned Token.
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uint public parentSnapShotBlock;
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// `creationBlock` is the block number that the Cloned Token was created
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uint public creationBlock;
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// `balances` is the map that tracks the balance of each address
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mapping (address => Checkpoint[]) balances;
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// `allowed` tracks any extra transfer rights as in all ERC20 tokens
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mapping (address => mapping (address => uint256)) allowed;
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// Tracks the history of the `totalSupply` of the token
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Checkpoint[] totalSupplyHistory;
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// Flag that determines if the token is transferable or not.
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bool public isConstant;
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// The factory used to create new cloned tokens
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MiniMeTokenFactory public tokenFactory;
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////////////////
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// Constructor
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////////////////
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/// @notice Constructor to create a MiniMeToken
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/// @param _tokenFactory The address of the MiniMeTokenFactory contract that
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/// will create the Cloned token contracts
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/// @param _parentToken Address of the parent token, set to 0x0 if it is a
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/// new token
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/// @param _parentSnapShotBlock Block of the parent token that will
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/// determine the initial distribution of the cloned token, set to 0 if it
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/// is a new token
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/// @param _tokenName Name of the new token
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/// @param _decimalUnits Number of decimals of the new token
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/// @param _tokenSymbol Token Symbol for the new token
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/// @param _isConstant If true, tokens will not be able to be transferred
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function MiniMeToken(
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address _tokenFactory,
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address _parentToken,
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uint _parentSnapShotBlock,
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string _tokenName,
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uint8 _decimalUnits,
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string _tokenSymbol,
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bool _isConstant
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) {
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tokenFactory = MiniMeTokenFactory(_tokenFactory);
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name = _tokenName; // Set the name
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decimals = _decimalUnits; // Set the decimals
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symbol = _tokenSymbol; // Set the symbol
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parentToken = MiniMeToken(_parentToken);
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parentSnapShotBlock = _parentSnapShotBlock;
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isConstant = _isConstant;
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creationBlock = block.number;
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}
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2016-11-10 13:54:33 +00:00
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///////////////////
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// ERC20 Methods
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///////////////////
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/// @notice Send `_amount` tokens to `_to` from `msg.sender`
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/// @param _to The address of the recipient
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/// @param _amount The amount of tokens to be transferred
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/// @return Whether the transfer was successful or not
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function transfer(address _to, uint256 _amount) returns (bool success) {
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if (isConstant) throw;
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return doTransfer(msg.sender, _to, _amount);
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}
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/// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
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/// is approved by `_from`
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/// @param _from The address holding the tokens being transferred
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/// @param _to The address of the recipient
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/// @param _amount The amount of tokens to be transferred
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/// @return True if the transfer was successful
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function transferFrom(address _from, address _to, uint256 _amount
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) returns (bool success) {
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2016-11-11 13:54:42 +00:00
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// The controller of this contract can move tokens around at will, this is
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// important to recognize! Confirm that you trust the controller of this
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// contract, which in most situations should be another open source
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// smart contract or 0x0
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if (msg.sender != controller) {
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if (isConstant) throw;
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// The standard ERC 20 transferFrom functionality
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if (allowed[_from][msg.sender] < _amount) return false;
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allowed[_from][msg.sender] -= _amount;
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}
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return doTransfer(_from, _to, _amount);
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}
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function doTransfer(address _from, address _to, uint _amount
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) internal returns(bool) {
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if (_amount == 0) {
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return true;
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}
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2016-11-10 13:54:33 +00:00
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// Do not allow transfer to 0x0 or the token contract itself
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if ((_to == 0) || (_to == address(this))) throw;
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// If the amount being transfered is more than the balance of the
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// account the transfer returns false
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var previousBalanceFrom = balanceOfAt(_from, block.number);
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if (previousBalanceFrom < _amount) {
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return false;
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}
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2016-11-10 13:54:33 +00:00
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// First update the balance array with the new value for the address
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// sending the tokens
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updateValueAtNow(balances[_from], previousBalanceFrom - _amount);
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// Then update the balance array with the new value for the address
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// receiving the tokens
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var previousBalanceTo = balanceOfAt(_to, block.number);
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updateValueAtNow(balances[_to], previousBalanceTo + _amount);
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// An event to make the transfer easy to find on the blockchain
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Transfer(_from, _to, _amount);
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return true;
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}
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/// @param _owner The address that's balance is being requested
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/// @return The balance of `_owner` at the current block
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function balanceOf(address _owner) constant returns (uint256 balance) {
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return balanceOfAt(_owner, block.number);
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}
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/// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
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/// its behalf
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/// @param _spender The address of the account able to transfer the tokens
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/// @param _amount The amount of tokens to be approved for transfer
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/// @return True if the approval was successful
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function approve(address _spender, uint256 _amount) returns (bool success) {
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if (isConstant) throw;
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allowed[msg.sender][_spender] = _amount;
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Approval(msg.sender, _spender, _amount);
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return true;
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}
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/// @param _owner The address of the account that owns the token
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/// @param _spender The address of the account able to transfer the tokens
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/// @return Amount of remaining tokens of _owner that _spender is allowed
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/// to spend
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function allowance(address _owner, address _spender
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) constant returns (uint256 remaining) {
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return allowed[_owner][_spender];
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}
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/// @notice `msg.sender` approves `_spender` to send `_amount` tokens on
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/// its behalf, and then a function is triggered in the contract that is
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/// being approved, `_spender`
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/// @param _spender The address of the contract able to transfer the tokens
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/// @param _amount The amount of tokens to be approved for transfer
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/// @return True if the function call was successful
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function approveAndCall(address _spender, uint256 _amount, bytes _extraData
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) returns (bool success) {
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if (isConstant) throw;
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allowed[msg.sender][_spender] = _amount;
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Approval(msg.sender, _spender, _amount);
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// This portion is copied from ConsenSys's Standard Token Contract. It
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// calls the receiveApproval function that is part of the contract that
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// is being approved (`_spender`). The function should look like:
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// `receiveApproval(address _from, uint256 _amount, address
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// _tokenContract, bytes _extraData)` It is assumed that the call
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// *should* succeed, otherwise one would use vanilla approve instead.
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if(!_spender.call(
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bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))),
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msg.sender,
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_amount,
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this,
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_extraData
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)) { throw;
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}
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return true;
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}
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/// @return The total amount of tokens
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function totalSupply() constant returns (uint) {
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return totalSupplyAt(block.number);
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}
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////////////////
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// Query balance and totalSupply in History
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////////////////
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/// @notice Queries the balance of `_owner` at a specific `_blockNumber`
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/// @param _owner The address from which the balance will be retrieved
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/// @param _blockNumber The block number when the balance is queried
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/// @return The balance at `_blockNumber`
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function balanceOfAt(address _owner, uint _blockNumber) constant
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returns (uint) {
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// If the `_blockNumber` requested is before the genesis block for the
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// the token being queried, the value returned is 0
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2016-11-08 13:12:24 +00:00
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|
|
if (_blockNumber < creationBlock) {
|
|
|
|
return 0;
|
2016-11-10 13:54:33 +00:00
|
|
|
|
2016-11-11 11:18:36 +00:00
|
|
|
// These next few lines are used when the balance of the token is
|
2016-11-11 11:36:50 +00:00
|
|
|
// 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.
|
2016-11-10 13:54:33 +00:00
|
|
|
} else if ((balances[_owner].length == 0)
|
|
|
|
|| (balances[_owner][0].fromBlock > _blockNumber)) {
|
2016-11-08 13:12:24 +00:00
|
|
|
if (address(parentToken) != 0) {
|
2016-11-09 17:09:56 +00:00
|
|
|
return parentToken.balanceOfAt(_owner, parentSnapShotBlock);
|
2016-11-08 13:12:24 +00:00
|
|
|
} else {
|
2016-11-11 11:18:36 +00:00
|
|
|
// Has no parent
|
2016-11-08 13:12:24 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
|
|
// This will return the expected balance during normal situations
|
2016-11-08 13:12:24 +00:00
|
|
|
} else {
|
2016-11-09 17:09:56 +00:00
|
|
|
return getValueAt( balances[_owner], _blockNumber);
|
2016-11-08 13:12:24 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
/// @notice Total amount of tokens at a specific `_blockNumber`.
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @param _blockNumber The block number when the totalSupply is queried
|
|
|
|
/// @return The total amount of tokens at `_blockNumber`
|
2016-11-08 13:12:24 +00:00
|
|
|
function totalSupplyAt(uint _blockNumber) constant returns(uint) {
|
2016-11-11 10:24:16 +00:00
|
|
|
|
2016-11-11 11:36:50 +00:00
|
|
|
// If the `_blockNumber` requested is before the genesis block for the
|
|
|
|
// the token being queried, the value returned is 0
|
2016-11-08 13:12:24 +00:00
|
|
|
if (_blockNumber < creationBlock) {
|
|
|
|
return 0;
|
2016-11-11 10:24:16 +00:00
|
|
|
|
2016-11-11 11:36:50 +00:00
|
|
|
// 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.
|
|
|
|
} else if ((totalSupplyHistory.length == 0)
|
2016-11-11 10:24:16 +00:00
|
|
|
|| (totalSupplyHistory[0].fromBlock > _blockNumber)) {
|
2016-11-08 13:12:24 +00:00
|
|
|
if (address(parentToken) != 0) {
|
|
|
|
return parentToken.totalSupplyAt(parentSnapShotBlock);
|
|
|
|
} else {
|
|
|
|
return 0;
|
|
|
|
}
|
2016-11-11 10:24:16 +00:00
|
|
|
|
|
|
|
// This will return the expected totalSupply during normal situations
|
2016-11-08 13:12:24 +00:00
|
|
|
} else {
|
|
|
|
return getValueAt( totalSupplyHistory, _blockNumber);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
////////////////
|
2016-11-11 11:18:36 +00:00
|
|
|
// Clone Token Method
|
2016-11-08 13:12:24 +00:00
|
|
|
////////////////
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @notice Creates a new child token with the initial distribution being
|
2016-11-11 11:36:50 +00:00
|
|
|
/// this token at `_snapshotBlock`
|
2016-11-09 17:09:56 +00:00
|
|
|
/// @param _childTokenName Name of the child token
|
|
|
|
/// @param _childDecimalUnits Units of the child token
|
|
|
|
/// @param _childTokenSymbol Symbol of the child token
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @param _snapshotBlock Block when the distribution of the parent token is
|
2016-11-11 11:36:50 +00:00
|
|
|
/// copied to set the initial distribution of the new child token;
|
|
|
|
/// if the block is higher than the actual block, the current block is used
|
|
|
|
/// @param _isConstant True if transfers are not allowed in the child token
|
|
|
|
/// if the block is higher than the actual block, the current block is used
|
2016-11-09 17:09:56 +00:00
|
|
|
/// @return The address of the new MiniMeToken Contract
|
2016-11-11 10:24:16 +00:00
|
|
|
function createChildToken(
|
2016-11-11 11:36:50 +00:00
|
|
|
string _childTokenName,
|
|
|
|
uint8 _childDecimalUnits,
|
|
|
|
string _childTokenSymbol,
|
|
|
|
uint _snapshotBlock,
|
2016-11-11 10:24:16 +00:00
|
|
|
bool _isConstant
|
|
|
|
) returns(address) {
|
2016-11-08 13:12:24 +00:00
|
|
|
if (_snapshotBlock > block.number) _snapshotBlock = block.number;
|
2016-11-11 10:24:16 +00:00
|
|
|
MiniMeToken childToken = tokenFactory.createChildToken(
|
2016-11-11 11:36:50 +00:00
|
|
|
this,
|
|
|
|
_snapshotBlock,
|
|
|
|
_childTokenName,
|
|
|
|
_childDecimalUnits,
|
|
|
|
_childTokenSymbol,
|
2016-11-11 10:24:16 +00:00
|
|
|
_isConstant
|
|
|
|
);
|
|
|
|
|
|
|
|
// An event to make the token easy to find on the blockchain
|
2016-11-08 13:12:24 +00:00
|
|
|
NewChildToken(address(childToken), _snapshotBlock);
|
|
|
|
return address(childToken);
|
|
|
|
}
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
// Generate and destroy tokens
|
|
|
|
////////////////
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @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
|
2016-11-11 13:54:42 +00:00
|
|
|
) onlyController returns (bool) {
|
2016-11-08 13:12:24 +00:00
|
|
|
uint curTotalSupply = getValueAt(totalSupplyHistory, block.number);
|
2016-11-09 17:21:18 +00:00
|
|
|
updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
|
2016-11-09 17:09:56 +00:00
|
|
|
var previousBalanceTo = balanceOf(_owner);
|
2016-11-09 17:21:18 +00:00
|
|
|
updateValueAtNow(balances[_owner], previousBalanceTo + _amount);
|
|
|
|
Transfer(0, _owner, _amount);
|
2016-11-09 17:09:56 +00:00
|
|
|
return true;
|
2016-11-08 13:12:24 +00:00
|
|
|
}
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @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
|
2016-11-11 13:54:42 +00:00
|
|
|
) onlyController returns (bool) {
|
2016-11-08 13:12:24 +00:00
|
|
|
uint curTotalSupply = getValueAt(totalSupplyHistory, block.number);
|
2016-11-09 17:21:18 +00:00
|
|
|
if (curTotalSupply < _amount) throw;
|
|
|
|
updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);
|
2016-11-09 17:09:56 +00:00
|
|
|
var previousBalanceFrom = balanceOf(_owner);
|
2016-11-09 17:21:18 +00:00
|
|
|
if (previousBalanceFrom < _amount) throw;
|
|
|
|
updateValueAtNow(balances[_owner], previousBalanceFrom - _amount);
|
|
|
|
Transfer(_owner, 0, _amount);
|
2016-11-09 17:09:56 +00:00
|
|
|
return true;
|
2016-11-08 13:12:24 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
// Constant tokens
|
|
|
|
////////////////
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
|
|
|
/// @notice Sets if the contract is constant or not
|
|
|
|
/// @param _isConstant true to don't allow transfers false to allow transfer
|
2016-11-11 13:54:42 +00:00
|
|
|
function setConstant(bool _isConstant) onlyController {
|
2016-11-08 13:12:24 +00:00
|
|
|
isConstant = _isConstant;
|
|
|
|
}
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
// Internal helper functions to query and set a value in a snapshot array
|
|
|
|
////////////////
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
function getValueAt(Checkpoint[] storage checkpoints, uint _block
|
|
|
|
) constant internal returns (uint) {
|
2016-11-08 13:12:24 +00:00
|
|
|
if (checkpoints.length == 0) return 0;
|
2016-11-09 17:09:56 +00:00
|
|
|
// Shorcut for the actual value
|
2016-11-11 10:24:16 +00:00
|
|
|
if (_block >= checkpoints[checkpoints.length-1].fromBlock)
|
|
|
|
return checkpoints[checkpoints.length-1].value;
|
2016-11-08 13:12:24 +00:00
|
|
|
if (_block < checkpoints[0].fromBlock) return 0;
|
2016-11-11 11:18:36 +00:00
|
|
|
|
|
|
|
// Binary search of the value in the array.
|
2016-11-08 13:12:24 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
function updateValueAtNow(Checkpoint[] storage checkpoints, uint _value
|
|
|
|
) internal {
|
2016-11-11 11:36:50 +00:00
|
|
|
if ((checkpoints.length == 0)
|
2016-11-11 10:24:16 +00:00
|
|
|
|| (checkpoints[checkpoints.length -1].fromBlock < block.number)) {
|
2016-11-08 13:12:24 +00:00
|
|
|
Checkpoint newCheckPoint = checkpoints[ checkpoints.length++ ];
|
|
|
|
newCheckPoint.fromBlock = block.number;
|
|
|
|
newCheckPoint.value = _value;
|
|
|
|
} else {
|
|
|
|
Checkpoint oldCheckPoint = checkpoints[checkpoints.length-1];
|
|
|
|
oldCheckPoint.value = _value;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
/// @notice The fallback function: If the contract's owner has not been set
|
|
|
|
/// to 0, the ether is sent to the owner (normally the token creation
|
2016-11-11 11:36:50 +00:00
|
|
|
/// contract) using the `proxyPayment` method.
|
2016-11-09 17:09:56 +00:00
|
|
|
function () payable {
|
2016-11-11 13:54:42 +00:00
|
|
|
if (controller == 0) throw;
|
|
|
|
if (! TokenCreation(controller).proxyPayment.value(msg.value)(msg.sender)) {
|
2016-11-09 17:09:56 +00:00
|
|
|
throw;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-08 13:12:24 +00:00
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
////////////////
|
|
|
|
// Events
|
|
|
|
////////////////
|
2016-11-09 17:21:18 +00:00
|
|
|
event Transfer(address indexed _from, address indexed _to, uint256 _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
event NewChildToken(address indexed _childToken, uint _snapshotBlock);
|
2016-11-11 10:24:16 +00:00
|
|
|
event Approval(
|
|
|
|
address indexed _owner,
|
|
|
|
address indexed _spender,
|
|
|
|
uint256 _amount
|
|
|
|
);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
|
2016-11-11 11:18:36 +00:00
|
|
|
|
|
|
|
////////////////
|
|
|
|
// MiniMeTokenFactory
|
|
|
|
////////////////
|
|
|
|
|
|
|
|
// This contract is used to generate child contracts from a contract.
|
|
|
|
// In solidity this is the way to create a contract from a contract of the same
|
|
|
|
// class
|
2016-11-08 13:12:24 +00:00
|
|
|
contract MiniMeTokenFactory {
|
|
|
|
function createChildToken(
|
|
|
|
address _parentToken,
|
|
|
|
uint _snapshotBlock,
|
|
|
|
string _tokenName,
|
|
|
|
uint8 _decimalUnits,
|
|
|
|
string _tokenSymbol,
|
|
|
|
bool _isConstant
|
|
|
|
) returns (MiniMeToken) {
|
2016-11-11 10:24:16 +00:00
|
|
|
MiniMeToken newToken = new MiniMeToken(
|
|
|
|
this,
|
|
|
|
_parentToken,
|
|
|
|
_snapshotBlock,
|
|
|
|
_tokenName,
|
|
|
|
_decimalUnits,
|
|
|
|
_tokenSymbol,
|
|
|
|
_isConstant
|
|
|
|
);
|
2016-11-08 13:12:24 +00:00
|
|
|
return newToken;
|
|
|
|
}
|
|
|
|
}
|