{ "contractName": "ApproveAndCallFallBack", "abi": [ { "constant": false, "inputs": [ { "name": "from", "type": "address" }, { "name": "_amount", "type": "uint256" }, { "name": "_token", "type": "address" }, { "name": "_data", "type": "bytes" } ], "name": "receiveApproval", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "bytecode": "0x", "deployedBytecode": "0x", "sourceMap": "", "deployedSourceMap": "", "source": "pragma solidity ^0.4.6;\n\n/*\n Copyright 2016, Jordi Baylina\n\n This program is free software: you can redistribute it and/or modify\n it under the terms of the GNU General Public License as published by\n the Free Software Foundation, either version 3 of the License, or\n (at your option) any later version.\n\n This program is distributed in the hope that it will be useful,\n but WITHOUT ANY WARRANTY; without even the implied warranty of\n MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n GNU General Public License for more details.\n\n You should have received a copy of the GNU General Public License\n along with this program. If not, see .\n */\n\n/// @title MiniMeToken Contract\n/// @author Jordi Baylina\n/// @dev This token contract's goal is to make it easy for anyone to clone this\n/// token using the token distribution at a given block, this will allow DAO's\n/// and DApps to upgrade their features in a decentralized manner without\n/// affecting the original token\n/// @dev It is ERC20 compliant, but still needs to under go further testing.\n\nimport \"./ITokenController.sol\";\n\ncontract Controlled {\n /// @notice The address of the controller is the only address that can call\n /// a function with this modifier\n modifier onlyController {\n require(msg.sender == controller);\n _;\n }\n\n address public controller;\n\n function Controlled() public { controller = msg.sender;}\n\n /// @notice Changes the controller of the contract\n /// @param _newController The new controller of the contract\n function changeController(address _newController) onlyController public {\n controller = _newController;\n }\n}\n\ncontract ApproveAndCallFallBack {\n function receiveApproval(\n address from,\n uint256 _amount,\n address _token,\n bytes _data\n ) public;\n}\n\n/// @dev The actual token contract, the default controller is the msg.sender\n/// that deploys the contract, so usually this token will be deployed by a\n/// token controller contract, which Giveth will call a \"Campaign\"\ncontract MiniMeToken is Controlled {\n\n string public name; //The Token's name: e.g. DigixDAO Tokens\n uint8 public decimals; //Number of decimals of the smallest unit\n string public symbol; //An identifier: e.g. REP\n string public version = \"MMT_0.1\"; //An arbitrary versioning scheme\n\n\n /// @dev `Checkpoint` is the structure that attaches a block number to a\n /// given value, the block number attached is the one that last changed the\n /// value\n struct Checkpoint {\n\n // `fromBlock` is the block number that the value was generated from\n uint128 fromBlock;\n\n // `value` is the amount of tokens at a specific block number\n uint128 value;\n }\n\n // `parentToken` is the Token address that was cloned to produce this token;\n // it will be 0x0 for a token that was not cloned\n MiniMeToken public parentToken;\n\n // `parentSnapShotBlock` is the block number from the Parent Token that was\n // used to determine the initial distribution of the Clone Token\n uint public parentSnapShotBlock;\n\n // `creationBlock` is the block number that the Clone Token was created\n uint public creationBlock;\n\n // `balances` is the map that tracks the balance of each address, in this\n // contract when the balance changes the block number that the change\n // occurred is also included in the map\n mapping (address => Checkpoint[]) balances;\n\n // `allowed` tracks any extra transfer rights as in all ERC20 tokens\n mapping (address => mapping (address => uint256)) allowed;\n\n // Tracks the history of the `totalSupply` of the token\n Checkpoint[] totalSupplyHistory;\n\n // Flag that determines if the token is transferable or not.\n bool public transfersEnabled;\n\n // The factory used to create new clone tokens\n MiniMeTokenFactory public tokenFactory;\n\n////////////////\n// Constructor\n////////////////\n\n /// @notice Constructor to create a MiniMeToken\n /// @param _tokenFactory The address of the MiniMeTokenFactory contract that\n /// will create the Clone token contracts, the token factory needs to be\n /// deployed first\n /// @param _parentToken Address of the parent token, set to 0x0 if it is a\n /// new token\n /// @param _parentSnapShotBlock Block of the parent token that will\n /// determine the initial distribution of the clone token, set to 0 if it\n /// is a new token\n /// @param _tokenName Name of the new token\n /// @param _decimalUnits Number of decimals of the new token\n /// @param _tokenSymbol Token Symbol for the new token\n /// @param _transfersEnabled If true, tokens will be able to be transferred\n function MiniMeToken(\n address _tokenFactory,\n address _parentToken,\n uint _parentSnapShotBlock,\n string _tokenName,\n uint8 _decimalUnits,\n string _tokenSymbol,\n bool _transfersEnabled\n ) public\n {\n tokenFactory = MiniMeTokenFactory(_tokenFactory);\n name = _tokenName; // Set the name\n decimals = _decimalUnits; // Set the decimals\n symbol = _tokenSymbol; // Set the symbol\n parentToken = MiniMeToken(_parentToken);\n parentSnapShotBlock = _parentSnapShotBlock;\n transfersEnabled = _transfersEnabled;\n creationBlock = block.number;\n }\n\n\n///////////////////\n// ERC20 Methods\n///////////////////\n\n /// @notice Send `_amount` tokens to `_to` from `msg.sender`\n /// @param _to The address of the recipient\n /// @param _amount The amount of tokens to be transferred\n /// @return Whether the transfer was successful or not\n function transfer(address _to, uint256 _amount) public returns (bool success) {\n require(transfersEnabled);\n return doTransfer(msg.sender, _to, _amount);\n }\n\n /// @notice Send `_amount` tokens to `_to` from `_from` on the condition it\n /// is approved by `_from`\n /// @param _from The address holding the tokens being transferred\n /// @param _to The address of the recipient\n /// @param _amount The amount of tokens to be transferred\n /// @return True if the transfer was successful\n function transferFrom(address _from, address _to, uint256 _amount) public returns (bool success) {\n\n // The controller of this contract can move tokens around at will,\n // this is important to recognize! Confirm that you trust the\n // controller of this contract, which in most situations should be\n // another open source smart contract or 0x0\n if (msg.sender != controller) {\n require(transfersEnabled);\n\n // The standard ERC 20 transferFrom functionality\n if (allowed[_from][msg.sender] < _amount)\n return false;\n allowed[_from][msg.sender] -= _amount;\n }\n return doTransfer(_from, _to, _amount);\n }\n\n /// @dev This is the actual transfer function in the token contract, it can\n /// only be called by other functions in this contract.\n /// @param _from The address holding the tokens being transferred\n /// @param _to The address of the recipient\n /// @param _amount The amount of tokens to be transferred\n /// @return True if the transfer was successful\n function doTransfer(address _from, address _to, uint _amount) internal returns(bool) {\n if (_amount == 0) {\n return true;\n }\n require(parentSnapShotBlock < block.number);\n // Do not allow transfer to 0x0 or the token contract itself\n require((_to != 0) && (_to != address(this)));\n // If the amount being transfered is more than the balance of the\n // account the transfer returns false\n var previousBalanceFrom = balanceOfAt(_from, block.number);\n if (previousBalanceFrom < _amount) {\n return false;\n }\n // Alerts the token controller of the transfer\n if (isContract(controller)) {\n // Adding the ` == true` makes the linter shut up so...\n require(ITokenController(controller).onTransfer(_from, _to, _amount) == true);\n }\n // First update the balance array with the new value for the address\n // sending the tokens\n updateValueAtNow(balances[_from], previousBalanceFrom - _amount);\n // Then update the balance array with the new value for the address\n // receiving the tokens\n var previousBalanceTo = balanceOfAt(_to, block.number);\n require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow\n updateValueAtNow(balances[_to], previousBalanceTo + _amount);\n // An event to make the transfer easy to find on the blockchain\n Transfer(_from, _to, _amount);\n return true;\n }\n\n /// @param _owner The address that's balance is being requested\n /// @return The balance of `_owner` at the current block\n function balanceOf(address _owner) public constant returns (uint256 balance) {\n return balanceOfAt(_owner, block.number);\n }\n\n /// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on\n /// its behalf. This is a modified version of the ERC20 approve function\n /// to be a little bit safer\n /// @param _spender The address of the account able to transfer the tokens\n /// @param _amount The amount of tokens to be approved for transfer\n /// @return True if the approval was successful\n function approve(address _spender, uint256 _amount) public returns (bool success) {\n require(transfersEnabled);\n\n // To change the approve amount you first have to reduce the addresses`\n // allowance to zero by calling `approve(_spender,0)` if it is not\n // already 0 to mitigate the race condition described here:\n // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n require((_amount == 0) || (allowed[msg.sender][_spender] == 0));\n\n // Alerts the token controller of the approve function call\n if (isContract(controller)) {\n // Adding the ` == true` makes the linter shut up so...\n require(ITokenController(controller).onApprove(msg.sender, _spender, _amount) == true);\n }\n\n allowed[msg.sender][_spender] = _amount;\n Approval(msg.sender, _spender, _amount);\n return true;\n }\n\n /// @dev This function makes it easy to read the `allowed[]` map\n /// @param _owner The address of the account that owns the token\n /// @param _spender The address of the account able to transfer the tokens\n /// @return Amount of remaining tokens of _owner that _spender is allowed\n /// to spend\n function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {\n return allowed[_owner][_spender];\n }\n\n /// @notice `msg.sender` approves `_spender` to send `_amount` tokens on\n /// its behalf, and then a function is triggered in the contract that is\n /// being approved, `_spender`. This allows users to use their tokens to\n /// interact with contracts in one function call instead of two\n /// @param _spender The address of the contract able to transfer the tokens\n /// @param _amount The amount of tokens to be approved for transfer\n /// @return True if the function call was successful\n function approveAndCall(address _spender, uint256 _amount, bytes _extraData) public returns (bool success) {\n require(approve(_spender, _amount));\n\n ApproveAndCallFallBack(_spender).receiveApproval(\n msg.sender,\n _amount,\n this,\n _extraData\n );\n\n return true;\n }\n\n /// @dev This function makes it easy to get the total number of tokens\n /// @return The total number of tokens\n function totalSupply() public constant returns (uint) {\n return totalSupplyAt(block.number);\n }\n\n\n////////////////\n// Query balance and totalSupply in History\n////////////////\n\n /// @dev Queries the balance of `_owner` at a specific `_blockNumber`\n /// @param _owner The address from which the balance will be retrieved\n /// @param _blockNumber The block number when the balance is queried\n /// @return The balance at `_blockNumber`\n function balanceOfAt(address _owner, uint _blockNumber) public constant returns (uint) {\n\n // These next few lines are used when the balance of the token is\n // requested before a check point was ever created for this token, it\n // requires that the `parentToken.balanceOfAt` be queried at the\n // genesis block for that token as this contains initial balance of\n // this token\n if ((balances[_owner].length == 0) || (balances[_owner][0].fromBlock > _blockNumber)) {\n if (address(parentToken) != 0) {\n return parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock));\n } else {\n // Has no parent\n return 0;\n }\n\n // This will return the expected balance during normal situations\n } else {\n return getValueAt(balances[_owner], _blockNumber);\n }\n }\n\n /// @notice Total amount of tokens at a specific `_blockNumber`.\n /// @param _blockNumber The block number when the totalSupply is queried\n /// @return The total amount of tokens at `_blockNumber`\n function totalSupplyAt(uint _blockNumber) public constant returns(uint) {\n\n // These next few lines are used when the totalSupply of the token is\n // requested before a check point was ever created for this token, it\n // requires that the `parentToken.totalSupplyAt` be queried at the\n // genesis block for this token as that contains totalSupply of this\n // token at this block number.\n if ((totalSupplyHistory.length == 0) || (totalSupplyHistory[0].fromBlock > _blockNumber)) {\n if (address(parentToken) != 0) {\n return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock));\n } else {\n return 0;\n }\n\n // This will return the expected totalSupply during normal situations\n } else {\n return getValueAt(totalSupplyHistory, _blockNumber);\n }\n }\n\n////////////////\n// Clone Token Method\n////////////////\n\n /// @notice Creates a new clone token with the initial distribution being\n /// this token at `_snapshotBlock`\n /// @param _cloneTokenName Name of the clone token\n /// @param _cloneDecimalUnits Number of decimals of the smallest unit\n /// @param _cloneTokenSymbol Symbol of the clone token\n /// @param _snapshotBlock Block when the distribution of the parent token is\n /// copied to set the initial distribution of the new clone token;\n /// if the block is zero than the actual block, the current block is used\n /// @param _transfersEnabled True if transfers are allowed in the clone\n /// @return The address of the new MiniMeToken Contract\n function createCloneToken(\n string _cloneTokenName,\n uint8 _cloneDecimalUnits,\n string _cloneTokenSymbol,\n uint _snapshotBlock,\n bool _transfersEnabled\n ) public returns(address)\n {\n uint256 snapshot = _snapshotBlock == 0 ? block.number - 1 : _snapshotBlock;\n\n MiniMeToken cloneToken = tokenFactory.createCloneToken(\n this,\n snapshot,\n _cloneTokenName,\n _cloneDecimalUnits,\n _cloneTokenSymbol,\n _transfersEnabled\n );\n\n cloneToken.changeController(msg.sender);\n\n // An event to make the token easy to find on the blockchain\n NewCloneToken(address(cloneToken), snapshot);\n return address(cloneToken);\n }\n\n////////////////\n// Generate and destroy tokens\n////////////////\n\n /// @notice Generates `_amount` tokens that are assigned to `_owner`\n /// @param _owner The address that will be assigned the new tokens\n /// @param _amount The quantity of tokens generated\n /// @return True if the tokens are generated correctly\n function generateTokens(address _owner, uint _amount) onlyController public returns (bool) {\n uint curTotalSupply = totalSupply();\n require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow\n uint previousBalanceTo = balanceOf(_owner);\n require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow\n updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);\n updateValueAtNow(balances[_owner], previousBalanceTo + _amount);\n Transfer(0, _owner, _amount);\n return true;\n }\n\n\n /// @notice Burns `_amount` tokens from `_owner`\n /// @param _owner The address that will lose the tokens\n /// @param _amount The quantity of tokens to burn\n /// @return True if the tokens are burned correctly\n function destroyTokens(address _owner, uint _amount) onlyController public returns (bool) {\n uint curTotalSupply = totalSupply();\n require(curTotalSupply >= _amount);\n uint previousBalanceFrom = balanceOf(_owner);\n require(previousBalanceFrom >= _amount);\n updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);\n updateValueAtNow(balances[_owner], previousBalanceFrom - _amount);\n Transfer(_owner, 0, _amount);\n return true;\n }\n\n////////////////\n// Enable tokens transfers\n////////////////\n\n\n /// @notice Enables token holders to transfer their tokens freely if true\n /// @param _transfersEnabled True if transfers are allowed in the clone\n function enableTransfers(bool _transfersEnabled) onlyController public {\n transfersEnabled = _transfersEnabled;\n }\n\n////////////////\n// Internal helper functions to query and set a value in a snapshot array\n////////////////\n\n /// @dev `getValueAt` retrieves the number of tokens at a given block number\n /// @param checkpoints The history of values being queried\n /// @param _block The block number to retrieve the value at\n /// @return The number of tokens being queried\n function getValueAt(Checkpoint[] storage checkpoints, uint _block) constant internal returns (uint) {\n if (checkpoints.length == 0)\n return 0;\n\n // Shortcut for the actual value\n if (_block >= checkpoints[checkpoints.length-1].fromBlock)\n return checkpoints[checkpoints.length-1].value;\n if (_block < checkpoints[0].fromBlock)\n return 0;\n\n // Binary search of the value in the array\n uint min = 0;\n uint max = checkpoints.length-1;\n while (max > min) {\n uint mid = (max + min + 1) / 2;\n if (checkpoints[mid].fromBlock<=_block) {\n min = mid;\n } else {\n max = mid-1;\n }\n }\n return checkpoints[min].value;\n }\n\n /// @dev `updateValueAtNow` used to update the `balances` map and the\n /// `totalSupplyHistory`\n /// @param checkpoints The history of data being updated\n /// @param _value The new number of tokens\n function updateValueAtNow(Checkpoint[] storage checkpoints, uint _value) internal {\n if ((checkpoints.length == 0) || (checkpoints[checkpoints.length - 1].fromBlock < block.number)) {\n Checkpoint storage newCheckPoint = checkpoints[checkpoints.length++];\n newCheckPoint.fromBlock = uint128(block.number);\n newCheckPoint.value = uint128(_value);\n } else {\n Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length - 1];\n oldCheckPoint.value = uint128(_value);\n }\n }\n\n /// @dev Internal function to determine if an address is a contract\n /// @param _addr The address being queried\n /// @return True if `_addr` is a contract\n function isContract(address _addr) constant internal returns(bool) {\n uint size;\n if (_addr == 0)\n return false;\n\n assembly {\n size := extcodesize(_addr)\n }\n\n return size>0;\n }\n\n /// @dev Helper function to return a min betwen the two uints\n function min(uint a, uint b) internal returns (uint) {\n return a < b ? a : b;\n }\n\n /// @notice The fallback function: If the contract's controller has not been\n /// set to 0, then the `proxyPayment` method is called which relays the\n /// ether and creates tokens as described in the token controller contract\n function () payable public {\n require(isContract(controller));\n // Adding the ` == true` makes the linter shut up so...\n require(ITokenController(controller).proxyPayment.value(msg.value)(msg.sender) == true);\n }\n\n//////////\n// Safety Methods\n//////////\n\n /// @notice This method can be used by the controller to extract mistakenly\n /// sent tokens to this contract.\n /// @param _token The address of the token contract that you want to recover\n /// set to 0 in case you want to extract ether.\n function claimTokens(address _token) onlyController public {\n if (_token == 0x0) {\n controller.transfer(this.balance);\n return;\n }\n\n MiniMeToken token = MiniMeToken(_token);\n uint balance = token.balanceOf(this);\n token.transfer(controller, balance);\n ClaimedTokens(_token, controller, balance);\n }\n\n////////////////\n// Events\n////////////////\n event ClaimedTokens(address indexed _token, address indexed _controller, uint _amount);\n event Transfer(address indexed _from, address indexed _to, uint256 _amount);\n event NewCloneToken(address indexed _cloneToken, uint _snapshotBlock);\n event Approval(\n address indexed _owner,\n address indexed _spender,\n uint256 _amount\n );\n\n}\n\n\n////////////////\n// MiniMeTokenFactory\n////////////////\n\n/// @dev This contract is used to generate clone contracts from a contract.\n/// In solidity this is the way to create a contract from a contract of the\n/// same class\ncontract MiniMeTokenFactory {\n\n /// @notice Update the DApp by creating a new token with new functionalities\n /// the msg.sender becomes the controller of this clone token\n /// @param _parentToken Address of the token being cloned\n /// @param _snapshotBlock Block of the parent token that will\n /// determine the initial distribution of the clone token\n /// @param _tokenName Name of the new token\n /// @param _decimalUnits Number of decimals of the new token\n /// @param _tokenSymbol Token Symbol for the new token\n /// @param _transfersEnabled If true, tokens will be able to be transferred\n /// @return The address of the new token contract\n function createCloneToken(\n address _parentToken,\n uint _snapshotBlock,\n string _tokenName,\n uint8 _decimalUnits,\n string _tokenSymbol,\n bool _transfersEnabled\n ) public returns (MiniMeToken)\n {\n MiniMeToken newToken = new MiniMeToken(\n this,\n _parentToken,\n _snapshotBlock,\n _tokenName,\n _decimalUnits,\n _tokenSymbol,\n _transfersEnabled\n );\n\n newToken.changeController(msg.sender);\n return newToken;\n }\n}\n", "sourcePath": "@aragon/os/contracts/lib/minime/MiniMeToken.sol", "ast": { "attributes": { "absolutePath": "@aragon/os/contracts/lib/minime/MiniMeToken.sol", "exportedSymbols": { "ApproveAndCallFallBack": [ 10850 ], "Controlled": [ 10838 ], "MiniMeToken": [ 11873 ], "MiniMeTokenFactory": [ 11914 ] } }, "children": [ { "attributes": { "literals": [ "solidity", "^", "0.4", ".6" ] }, "id": 10802, "name": "PragmaDirective", "src": "0:23:51" }, { "attributes": { "SourceUnit": 10801, "absolutePath": "@aragon/os/contracts/lib/minime/ITokenController.sol", "file": "./ITokenController.sol", "scope": 11915, "symbolAliases": [ null ], "unitAlias": "" }, "id": 10803, "name": "ImportDirective", "src": "1125:32:51" }, { "attributes": { "baseContracts": [ null ], "contractDependencies": [ null ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "linearizedBaseContracts": [ 10838 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