Contract Source Code:
File 1 of 1 : TokenProxy
/*
Akropolis Token, https://akropolis.io
*/
pragma solidity ^0.4.24;
// File: openzeppelin-solidity/contracts/math/SafeMath.sol
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (_a == 0) {
return 0;
}
c = _a * _b;
assert(c / _a == _b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
// assert(_b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = _a / _b;
// assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
return _a / _b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
assert(_b <= _a);
return _a - _b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
c = _a + _b;
assert(c >= _a);
return c;
}
}
// File: contracts/helpers/Ownable.sol
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions". This adds two-phase
* ownership control to OpenZeppelin's Ownable class. In this model, the original owner
* designates a new owner but does not actually transfer ownership. The new owner then accepts
* ownership and completes the transfer.
*/
contract Ownable {
address public owner;
address public pendingOwner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
pendingOwner = address(0);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner, "Account is not owner");
_;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyPendingOwner() {
require(msg.sender == pendingOwner, "Account is not pending owner");
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function transferOwnership(address _newOwner) public onlyOwner {
require(_newOwner != address(0), "Empty address");
pendingOwner = _newOwner;
}
/**
* @dev Allows the pendingOwner address to finalize the transfer.
*/
function claimOwnership() onlyPendingOwner public {
emit OwnershipTransferred(owner, pendingOwner);
owner = pendingOwner;
pendingOwner = address(0);
}
}
// File: contracts/token/dataStorage/AllowanceSheet.sol
/**
* @title AllowanceSheet
* @notice A wrapper around an allowance mapping.
*/
contract AllowanceSheet is Ownable {
using SafeMath for uint256;
mapping (address => mapping (address => uint256)) public allowanceOf;
function addAllowance(address _tokenHolder, address _spender, uint256 _value) public onlyOwner {
allowanceOf[_tokenHolder][_spender] = allowanceOf[_tokenHolder][_spender].add(_value);
}
function subAllowance(address _tokenHolder, address _spender, uint256 _value) public onlyOwner {
allowanceOf[_tokenHolder][_spender] = allowanceOf[_tokenHolder][_spender].sub(_value);
}
function setAllowance(address _tokenHolder, address _spender, uint256 _value) public onlyOwner {
allowanceOf[_tokenHolder][_spender] = _value;
}
}
// File: contracts/token/dataStorage/BalanceSheet.sol
/**
* @title BalanceSheet
* @notice A wrapper around the balanceOf mapping.
*/
contract BalanceSheet is Ownable {
using SafeMath for uint256;
mapping (address => uint256) public balanceOf;
uint256 public totalSupply;
function addBalance(address _addr, uint256 _value) public onlyOwner {
balanceOf[_addr] = balanceOf[_addr].add(_value);
}
function subBalance(address _addr, uint256 _value) public onlyOwner {
balanceOf[_addr] = balanceOf[_addr].sub(_value);
}
function setBalance(address _addr, uint256 _value) public onlyOwner {
balanceOf[_addr] = _value;
}
function addTotalSupply(uint256 _value) public onlyOwner {
totalSupply = totalSupply.add(_value);
}
function subTotalSupply(uint256 _value) public onlyOwner {
totalSupply = totalSupply.sub(_value);
}
function setTotalSupply(uint256 _value) public onlyOwner {
totalSupply = _value;
}
}
// File: contracts/token/dataStorage/TokenStorage.sol
/**
* @title TokenStorage
*/
contract TokenStorage {
/**
Storage
*/
BalanceSheet public balances;
AllowanceSheet public allowances;
string public name; //name of Token
uint8 public decimals; //decimals of Token
string public symbol; //Symbol of Token
/**
* @dev a TokenStorage consumer can set its storages only once, on construction
*
**/
constructor (address _balances, address _allowances, string _name, uint8 _decimals, string _symbol) public {
balances = BalanceSheet(_balances);
allowances = AllowanceSheet(_allowances);
name = _name;
decimals = _decimals;
symbol = _symbol;
}
/**
* @dev claim ownership of balance sheet passed into constructor.
**/
function claimBalanceOwnership() public {
balances.claimOwnership();
}
/**
* @dev claim ownership of allowance sheet passed into constructor.
**/
function claimAllowanceOwnership() public {
allowances.claimOwnership();
}
}
// File: zos-lib/contracts/upgradeability/Proxy.sol
/**
* @title Proxy
* @dev Implements delegation of calls to other contracts, with proper
* forwarding of return values and bubbling of failures.
* It defines a fallback function that delegates all calls to the address
* returned by the abstract _implementation() internal function.
*/
contract Proxy {
/**
* @dev Fallback function.
* Implemented entirely in `_fallback`.
*/
function () payable external {
_fallback();
}
/**
* @return The Address of the implementation.
*/
function _implementation() internal view returns (address);
/**
* @dev Delegates execution to an implementation contract.
* This is a low level function that doesn't return to its internal call site.
* It will return to the external caller whatever the implementation returns.
* @param implementation Address to delegate.
*/
function _delegate(address implementation) internal {
assembly {
// Copy msg.data. We take full control of memory in this inline assembly
// block because it will not return to Solidity code. We overwrite the
// Solidity scratch pad at memory position 0.
calldatacopy(0, 0, calldatasize)
// Call the implementation.
// out and outsize are 0 because we don't know the size yet.
let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)
// Copy the returned data.
returndatacopy(0, 0, returndatasize)
switch result
// delegatecall returns 0 on error.
case 0 { revert(0, returndatasize) }
default { return(0, returndatasize) }
}
}
/**
* @dev Function that is run as the first thing in the fallback function.
* Can be redefined in derived contracts to add functionality.
* Redefinitions must call super._willFallback().
*/
function _willFallback() internal {
}
/**
* @dev fallback implementation.
* Extracted to enable manual triggering.
*/
function _fallback() internal {
_willFallback();
_delegate(_implementation());
}
}
// File: openzeppelin-solidity/contracts/AddressUtils.sol
/**
* Utility library of inline functions on addresses
*/
library AddressUtils {
/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param _addr address to check
* @return whether the target address is a contract
*/
function isContract(address _addr) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
// solium-disable-next-line security/no-inline-assembly
assembly { size := extcodesize(_addr) }
return size > 0;
}
}
// File: zos-lib/contracts/upgradeability/UpgradeabilityProxy.sol
/**
* @title UpgradeabilityProxy
* @dev This contract implements a proxy that allows to change the
* implementation address to which it will delegate.
* Such a change is called an implementation upgrade.
*/
contract UpgradeabilityProxy is Proxy {
/**
* @dev Emitted when the implementation is upgraded.
* @param implementation Address of the new implementation.
*/
event Upgraded(address implementation);
/**
* @dev Storage slot with the address of the current implementation.
* This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
* validated in the constructor.
*/
bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;
/**
* @dev Contract constructor.
* @param _implementation Address of the initial implementation.
*/
constructor(address _implementation) public {
assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));
_setImplementation(_implementation);
}
/**
* @dev Returns the current implementation.
* @return Address of the current implementation
*/
function _implementation() internal view returns (address impl) {
bytes32 slot = IMPLEMENTATION_SLOT;
assembly {
impl := sload(slot)
}
}
/**
* @dev Upgrades the proxy to a new implementation.
* @param newImplementation Address of the new implementation.
*/
function _upgradeTo(address newImplementation) internal {
_setImplementation(newImplementation);
emit Upgraded(newImplementation);
}
/**
* @dev Sets the implementation address of the proxy.
* @param newImplementation Address of the new implementation.
*/
function _setImplementation(address newImplementation) private {
require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");
bytes32 slot = IMPLEMENTATION_SLOT;
assembly {
sstore(slot, newImplementation)
}
}
}
// File: contracts/token/TokenProxy.sol
/**
* @title TokenProxy
* @notice A proxy contract that serves the latest implementation of TokenProxy.
*/
contract TokenProxy is UpgradeabilityProxy, TokenStorage, Ownable {
constructor(address _implementation, address _balances, address _allowances, string _name, uint8 _decimals, string _symbol)
UpgradeabilityProxy(_implementation)
TokenStorage(_balances, _allowances, _name, _decimals, _symbol) public {
}
/**
* @dev Upgrade the backing implementation of the proxy.
* Only the admin can call this function.
* @param newImplementation Address of the new implementation.
*/
function upgradeTo(address newImplementation) public onlyOwner {
_upgradeTo(newImplementation);
}
/**
* @return The address of the implementation.
*/
function implementation() public view returns (address) {
return _implementation();
}
}