2016-11-11 11:36:50 +00:00
|
|
|
|
pragma solidity ^0.4.4;
|
|
|
|
|
|
2016-11-08 13:18:27 +00:00
|
|
|
|
/*
|
2016-11-10 09:51:02 +00:00
|
|
|
|
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 <http://www.gnu.org/licenses/>.
|
2016-11-08 13:18:27 +00:00
|
|
|
|
*/
|
|
|
|
|
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// @title MiniMeToken Contract
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @author Jordi Baylina
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// @dev This token contract's goal is to make it easy to clone this token and
|
|
|
|
|
/// spawn new tokens using the token distribution at a given block.
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// @dev It is ERC20 compliant, but still needs to under go further testing.
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-12-11 18:45:19 +00:00
|
|
|
|
// The controller must implement this interface
|
|
|
|
|
contract TokenController {
|
|
|
|
|
function proxyPayment(address _owner) payable returns(bool);
|
|
|
|
|
function onTransfer(address _from, address _to, uint _amount) returns(bool);
|
|
|
|
|
function onApprove(address _owner, address _spender, uint _amount) returns(bool);
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 13:54:42 +00:00
|
|
|
|
contract Controlled {
|
2016-11-11 14:33:29 +00:00
|
|
|
|
/// @notice The address of the controller is the only address that can call
|
|
|
|
|
/// a function with this modifier
|
2016-11-11 13:54:42 +00:00
|
|
|
|
modifier onlyController { if (msg.sender != controller) throw; _; }
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-11 13:54:42 +00:00
|
|
|
|
address public controller;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-11 13:54:42 +00:00
|
|
|
|
function Controlled() { controller = msg.sender;}
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-11 13:54:42 +00:00
|
|
|
|
/// @notice Changes the controller of the contract
|
|
|
|
|
/// @param _newController The new controller of the contract
|
|
|
|
|
function changeController(address _newController) onlyController {
|
|
|
|
|
controller = _newController;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 13:54:42 +00:00
|
|
|
|
contract MiniMeToken is Controlled {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
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
|
2016-11-12 20:27:38 +00:00
|
|
|
|
string public version = 'MMT_0.1'; //An arbitrary versioning scheme
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @dev `Checkpoint` is the structure that attaches a block number to the a
|
2016-11-11 17:43:07 +00:00
|
|
|
|
/// given value
|
2016-11-08 13:12:24 +00:00
|
|
|
|
struct Checkpoint {
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
|
|
|
|
// `fromBlock` is the block number that the value was generated from
|
2016-11-08 13:12:24 +00:00
|
|
|
|
uint fromBlock;
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
2016-11-11 11:36:50 +00:00
|
|
|
|
// `value` is the amount of tokens at a specific block number
|
2016-11-08 13:12:24 +00:00
|
|
|
|
uint value;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-12 20:27:38 +00:00
|
|
|
|
// `parentToken` is the Token address that was cloned to produce this token;
|
|
|
|
|
// it will be 0x0 for a token that was not cloned
|
2016-11-10 13:54:33 +00:00
|
|
|
|
MiniMeToken public parentToken;
|
|
|
|
|
|
|
|
|
|
// `parentSnapShotBlock` is the Block number from the Parent Token that was
|
2016-11-12 20:27:38 +00:00
|
|
|
|
// used to determine the initial distribution of the Clone Token
|
2016-11-10 13:54:33 +00:00
|
|
|
|
uint public parentSnapShotBlock;
|
|
|
|
|
|
2016-11-12 20:27:38 +00:00
|
|
|
|
// `creationBlock` is the block number that the Clone Token was created
|
2016-11-10 13:54:33 +00:00
|
|
|
|
uint public creationBlock;
|
|
|
|
|
|
2016-11-11 11:18:36 +00:00
|
|
|
|
// `balances` is the map that tracks the balance of each address
|
|
|
|
|
mapping (address => Checkpoint[]) balances;
|
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
// `allowed` tracks any extra transfer rights as in all ERC20 tokens
|
2016-11-08 13:12:24 +00:00
|
|
|
|
mapping (address => mapping (address => uint256)) allowed;
|
2016-11-11 11:18:36 +00:00
|
|
|
|
|
|
|
|
|
// Tracks the history of the `totalSupply` of the token
|
2016-11-08 13:12:24 +00:00
|
|
|
|
Checkpoint[] totalSupplyHistory;
|
2016-11-11 11:18:36 +00:00
|
|
|
|
|
|
|
|
|
// Flag that determines if the token is transferable or not.
|
2016-11-13 05:49:15 +00:00
|
|
|
|
bool public transfersEnabled;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-12 20:27:38 +00:00
|
|
|
|
// The factory used to create new clone tokens
|
2016-11-08 13:12:24 +00:00
|
|
|
|
MiniMeTokenFactory public tokenFactory;
|
|
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
|
// Constructor
|
|
|
|
|
////////////////
|
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @notice Constructor to create a MiniMeToken
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @param _tokenFactory The address of the MiniMeTokenFactory contract that
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// will create the Clone token contracts
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @param _parentToken Address of the parent token, set to 0x0 if it is a
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// new token
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @param _parentSnapShotBlock Block of the parent token that will
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// determine the initial distribution of the clone token, set to 0 if it
|
2016-11-11 11:18:36 +00:00
|
|
|
|
/// is a new token
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @param _tokenName Name of the new token
|
|
|
|
|
/// @param _decimalUnits Number of decimals of the new token
|
|
|
|
|
/// @param _tokenSymbol Token Symbol for the new token
|
2016-11-14 07:37:45 +00:00
|
|
|
|
/// @param _transfersEnabled If true, tokens will be able to be transferred
|
2016-11-08 13:12:24 +00:00
|
|
|
|
function MiniMeToken(
|
|
|
|
|
address _tokenFactory,
|
|
|
|
|
address _parentToken,
|
|
|
|
|
uint _parentSnapShotBlock,
|
|
|
|
|
string _tokenName,
|
|
|
|
|
uint8 _decimalUnits,
|
|
|
|
|
string _tokenSymbol,
|
2016-11-13 05:49:15 +00:00
|
|
|
|
bool _transfersEnabled
|
2016-11-11 10:24:16 +00:00
|
|
|
|
) {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
tokenFactory = MiniMeTokenFactory(_tokenFactory);
|
2016-11-11 11:18:36 +00:00
|
|
|
|
name = _tokenName; // Set the name
|
2016-11-10 13:54:33 +00:00
|
|
|
|
decimals = _decimalUnits; // Set the decimals
|
|
|
|
|
symbol = _tokenSymbol; // Set the symbol
|
2016-11-08 13:12:24 +00:00
|
|
|
|
parentToken = MiniMeToken(_parentToken);
|
|
|
|
|
parentSnapShotBlock = _parentSnapShotBlock;
|
2016-11-13 05:49:15 +00:00
|
|
|
|
transfersEnabled = _transfersEnabled;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
creationBlock = block.number;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
///////////////////
|
2016-11-11 11:18:36 +00:00
|
|
|
|
// ERC20 Methods
|
2016-11-10 13:54:33 +00:00
|
|
|
|
///////////////////
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @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
|
2016-11-09 17:21:18 +00:00
|
|
|
|
function transfer(address _to, uint256 _amount) returns (bool success) {
|
2016-11-13 05:49:15 +00:00
|
|
|
|
if (!transfersEnabled) throw;
|
2016-11-09 17:21:18 +00:00
|
|
|
|
return doTransfer(msg.sender, _to, _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// is approved by `_from`
|
2016-11-11 11:18:36 +00:00
|
|
|
|
/// @param _from The address holding the tokens being transferred
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @param _to The address of the recipient
|
|
|
|
|
/// @param _amount The amount of tokens to be transferred
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @return True if the transfer was successful
|
2016-11-11 10:24:16 +00:00
|
|
|
|
function transferFrom(address _from, address _to, uint256 _amount
|
|
|
|
|
) returns (bool success) {
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
2016-11-11 14:33:29 +00:00
|
|
|
|
// 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
|
2016-11-11 13:54:42 +00:00
|
|
|
|
if (msg.sender != controller) {
|
2016-11-13 05:49:15 +00:00
|
|
|
|
if (!transfersEnabled) throw;
|
2016-11-10 13:54:33 +00:00
|
|
|
|
|
|
|
|
|
// The standard ERC 20 transferFrom functionality
|
2016-11-09 17:21:18 +00:00
|
|
|
|
if (allowed[_from][msg.sender] < _amount) return false;
|
|
|
|
|
allowed[_from][msg.sender] -= _amount;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
2016-11-09 17:21:18 +00:00
|
|
|
|
return doTransfer(_from, _to, _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
function doTransfer(address _from, address _to, uint _amount
|
|
|
|
|
) internal returns(bool) {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-09 17:21:18 +00:00
|
|
|
|
if (_amount == 0) {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
// Do not allow transfer to 0x0 or the token contract itself
|
2016-11-08 13:12:24 +00:00
|
|
|
|
if ((_to == 0) || (_to == address(this))) throw;
|
|
|
|
|
|
2016-11-11 11:18:36 +00:00
|
|
|
|
// If the amount being transfered is more than the balance of the
|
2016-11-11 11:36:50 +00:00
|
|
|
|
// account the transfer returns false
|
2016-11-08 13:12:24 +00:00
|
|
|
|
var previousBalanceFrom = balanceOfAt(_from, block.number);
|
2016-11-09 17:21:18 +00:00
|
|
|
|
if (previousBalanceFrom < _amount) {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2016-12-11 18:45:19 +00:00
|
|
|
|
if ((controller != 0)&&(isContract(controller))) {
|
|
|
|
|
if (!TokenController(controller).onTransfer(_from, _to, _amount)) throw;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
// First update the balance array with the new value for the address
|
2016-11-11 11:36:50 +00:00
|
|
|
|
// sending the tokens
|
2016-11-09 17:21:18 +00:00
|
|
|
|
updateValueAtNow(balances[_from], previousBalanceFrom - _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
// Then update the balance array with the new value for the address
|
2016-11-11 11:36:50 +00:00
|
|
|
|
// receiving the tokens
|
2016-11-08 13:12:24 +00:00
|
|
|
|
var previousBalanceTo = balanceOfAt(_to, block.number);
|
2016-11-09 17:21:18 +00:00
|
|
|
|
updateValueAtNow(balances[_to], previousBalanceTo + _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-10 13:54:33 +00:00
|
|
|
|
// An event to make the transfer easy to find on the blockchain
|
2016-11-09 17:21:18 +00:00
|
|
|
|
Transfer(_from, _to, _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @param _owner The address that's balance is being requested
|
|
|
|
|
/// @return The balance of `_owner` at the current block
|
2016-11-08 13:12:24 +00:00
|
|
|
|
function balanceOf(address _owner) constant returns (uint256 balance) {
|
|
|
|
|
return balanceOfAt(_owner, block.number);
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// its behalf
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @param _spender The address of the account able to transfer the tokens
|
|
|
|
|
/// @param _amount The amount of tokens to be approved for transfer
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @return True if the approval was successful
|
2016-11-09 17:21:18 +00:00
|
|
|
|
function approve(address _spender, uint256 _amount) returns (bool success) {
|
2016-11-13 05:49:15 +00:00
|
|
|
|
if (!transfersEnabled) throw;
|
2016-12-11 17:37:52 +00:00
|
|
|
|
|
|
|
|
|
// 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 https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
|
|
|
|
|
if ((_amount!=0) && (allowed[msg.sender][_spender] !=0)) throw;
|
|
|
|
|
|
2016-12-11 18:45:19 +00:00
|
|
|
|
if ((controller != 0)&&(isContract(controller))) {
|
|
|
|
|
if (!TokenController(controller).onApprove(msg.sender, _spender, _amount)) throw;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-09 17:21:18 +00:00
|
|
|
|
allowed[msg.sender][_spender] = _amount;
|
|
|
|
|
Approval(msg.sender, _spender, _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @param _owner The address of the account that owns the token
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @param _spender The address of the account able to transfer the tokens
|
|
|
|
|
/// @return Amount of remaining tokens of _owner that _spender is allowed
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// to spend
|
2016-11-11 10:24:16 +00:00
|
|
|
|
function allowance(address _owner, address _spender
|
|
|
|
|
) constant returns (uint256 remaining) {
|
|
|
|
|
return allowed[_owner][_spender];
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @notice `msg.sender` approves `_spender` to send `_amount` tokens on
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// its behalf, and then a function is triggered in the contract that is
|
|
|
|
|
/// being approved, `_spender`
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @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
|
|
|
|
|
) returns (bool success) {
|
2016-11-09 17:21:18 +00:00
|
|
|
|
allowed[msg.sender][_spender] = _amount;
|
|
|
|
|
Approval(msg.sender, _spender, _amount);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
// This portion is copied from ConsenSys's Standard Token Contract. It
|
2016-11-11 11:36:50 +00:00
|
|
|
|
// calls the receiveApproval function that is part of the contract that
|
|
|
|
|
// is being approved (`_spender`). The function should look like:
|
|
|
|
|
// `receiveApproval(address _from, uint256 _amount, address
|
|
|
|
|
// _tokenContract, bytes _extraData)` It is assumed that the call
|
|
|
|
|
// *should* succeed, otherwise one would use vanilla approve instead.
|
2016-11-11 10:24:16 +00:00
|
|
|
|
if(!_spender.call(
|
|
|
|
|
bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))),
|
2016-11-11 11:36:50 +00:00
|
|
|
|
msg.sender,
|
|
|
|
|
_amount,
|
|
|
|
|
this,
|
2016-11-11 10:24:16 +00:00
|
|
|
|
_extraData
|
|
|
|
|
)) { throw;
|
|
|
|
|
}
|
2016-11-08 13:12:24 +00:00
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @return The total amount of tokens
|
2016-11-08 13:12:24 +00:00
|
|
|
|
function totalSupply() constant returns (uint) {
|
|
|
|
|
return totalSupplyAt(block.number);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
|
// Query balance and totalSupply in History
|
|
|
|
|
////////////////
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @notice Queries the balance of `_owner` at a specific `_blockNumber`
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @param _owner The address from which the balance will be retrieved
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @param _blockNumber The block number when the balance is queried
|
2016-11-10 13:54:33 +00:00
|
|
|
|
/// @return The balance at `_blockNumber`
|
2016-11-11 11:18:36 +00:00
|
|
|
|
function balanceOfAt(address _owner, uint _blockNumber) constant
|
2016-11-10 13:54:33 +00:00
|
|
|
|
returns (uint) {
|
2016-11-08 13:12:24 +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;
|
2016-11-10 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
|
2016-11-11 14:33:29 +00:00
|
|
|
|
// requires that the `parentToken.balanceOfAt` be queried at the
|
2016-11-13 05:49:15 +00:00
|
|
|
|
// genesis block for that token as this contains initial balance of
|
2016-11-11 14:33:29 +00:00
|
|
|
|
// 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
|
|
|
|
////////////////
|
|
|
|
|
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// @notice Creates a new clone token with the initial distribution being
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// this token at `_snapshotBlock`
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// @param _cloneTokenName Name of the clone token
|
|
|
|
|
/// @param _cloneDecimalUnits Units of the clone token
|
|
|
|
|
/// @param _cloneTokenSymbol Symbol of the clone token
|
2016-11-11 10:24:16 +00:00
|
|
|
|
/// @param _snapshotBlock Block when the distribution of the parent token is
|
2016-11-12 20:27:38 +00:00
|
|
|
|
/// copied to set the initial distribution of the new clone token;
|
2016-11-11 11:36:50 +00:00
|
|
|
|
/// if the block is higher than the actual block, the current block is used
|
2016-11-14 07:37:45 +00:00
|
|
|
|
/// @param _transfersEnabled True if transfers are allowed in the clone
|
2016-11-09 17:09:56 +00:00
|
|
|
|
/// @return The address of the new MiniMeToken Contract
|
2016-11-12 20:27:38 +00:00
|
|
|
|
function createCloneToken(
|
|
|
|
|
string _cloneTokenName,
|
|
|
|
|
uint8 _cloneDecimalUnits,
|
|
|
|
|
string _cloneTokenSymbol,
|
2016-11-11 11:36:50 +00:00
|
|
|
|
uint _snapshotBlock,
|
2016-11-13 05:49:15 +00:00
|
|
|
|
bool _transfersEnabled
|
2016-11-11 10:24:16 +00:00
|
|
|
|
) returns(address) {
|
2016-11-08 13:12:24 +00:00
|
|
|
|
if (_snapshotBlock > block.number) _snapshotBlock = block.number;
|
2016-11-12 20:27:38 +00:00
|
|
|
|
MiniMeToken cloneToken = tokenFactory.createCloneToken(
|
2016-11-11 11:36:50 +00:00
|
|
|
|
this,
|
|
|
|
|
_snapshotBlock,
|
2016-11-12 20:27:38 +00:00
|
|
|
|
_cloneTokenName,
|
|
|
|
|
_cloneDecimalUnits,
|
|
|
|
|
_cloneTokenSymbol,
|
2016-11-13 05:49:15 +00:00
|
|
|
|
_transfersEnabled
|
2016-11-11 10:24:16 +00:00
|
|
|
|
);
|
|
|
|
|
|
2016-12-11 18:45:19 +00:00
|
|
|
|
cloneToken.changeController(msg.sender);
|
|
|
|
|
|
2016-11-11 10:24:16 +00:00
|
|
|
|
// An event to make the token easy to find on the blockchain
|
2016-11-12 20:27:38 +00:00
|
|
|
|
NewCloneToken(address(cloneToken), _snapshotBlock);
|
|
|
|
|
return address(cloneToken);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
|
// 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
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
////////////////
|
2016-11-13 05:49:15 +00:00
|
|
|
|
// Enable tokens transfers
|
2016-11-08 13:12:24 +00:00
|
|
|
|
////////////////
|
|
|
|
|
|
2016-11-09 17:09:56 +00:00
|
|
|
|
|
2016-11-14 07:37:45 +00:00
|
|
|
|
/// @notice Enables token holders to transfer their tokens freely if true
|
|
|
|
|
/// @param _transfersEnabled True if transfers are allowed in the clone
|
2016-11-13 05:49:15 +00:00
|
|
|
|
function enableTransfers(bool _transfersEnabled) onlyController {
|
|
|
|
|
transfersEnabled = _transfersEnabled;
|
2016-11-08 13:12:24 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
////////////////
|
|
|
|
|
// 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;
|
2016-11-11 14:33:29 +00:00
|
|
|
|
// Shortcut 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
|
|
|
|
|
2016-11-11 14:33:29 +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;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2016-12-11 18:45:19 +00:00
|
|
|
|
// Internal function to determine if an address is a cntract
|
|
|
|
|
function isContract(address _addr) constant internal returns(bool) {
|
|
|
|
|
uint size;
|
|
|
|
|
assembly {
|
|
|
|
|
size := extcodesize(_addr)
|
|
|
|
|
}
|
|
|
|
|
return size>0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-11-11 14:33:29 +00:00
|
|
|
|
/// @notice The fallback function: If the contract's controller has not been
|
|
|
|
|
/// set to 0, the ether is sent to the controller (normally the token
|
|
|
|
|
/// creation 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;
|
2016-12-11 18:45:19 +00:00
|
|
|
|
if (isContract(controller)) {
|
|
|
|
|
if (! TokenController(controller).proxyPayment.value(msg.value)(msg.sender)) throw;
|
|
|
|
|
} else {
|
|
|
|
|
if (! controller.send(msg.value)) throw;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (! TokenController(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);
|
2016-11-12 20:27:38 +00:00
|
|
|
|
event NewCloneToken(address indexed _cloneToken, 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
|
|
|
|
|
////////////////
|
|
|
|
|
|
2016-11-12 20:27:38 +00:00
|
|
|
|
// This contract is used to generate clone contracts from a contract.
|
2016-11-11 11:18:36 +00:00
|
|
|
|
// 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 {
|
2016-11-12 20:27:38 +00:00
|
|
|
|
function createCloneToken(
|
2016-11-08 13:12:24 +00:00
|
|
|
|
address _parentToken,
|
|
|
|
|
uint _snapshotBlock,
|
|
|
|
|
string _tokenName,
|
|
|
|
|
uint8 _decimalUnits,
|
|
|
|
|
string _tokenSymbol,
|
2016-11-13 05:49:15 +00:00
|
|
|
|
bool _transfersEnabled
|
2016-11-08 13:12:24 +00:00
|
|
|
|
) returns (MiniMeToken) {
|
2016-11-11 10:24:16 +00:00
|
|
|
|
MiniMeToken newToken = new MiniMeToken(
|
|
|
|
|
this,
|
|
|
|
|
_parentToken,
|
|
|
|
|
_snapshotBlock,
|
|
|
|
|
_tokenName,
|
|
|
|
|
_decimalUnits,
|
|
|
|
|
_tokenSymbol,
|
2016-11-13 05:49:15 +00:00
|
|
|
|
_transfersEnabled
|
2016-11-11 10:24:16 +00:00
|
|
|
|
);
|
2016-12-11 18:45:19 +00:00
|
|
|
|
|
|
|
|
|
newToken.changeController(msg.sender);
|
2016-11-08 13:12:24 +00:00
|
|
|
|
return newToken;
|
|
|
|
|
}
|
|
|
|
|
}
|