Contract Source Code:
File 1 of 1 : ProxyToken
// File: @openzeppelin/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be aplied to your functions to restrict their use to
* the owner.
*/
contract Ownable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
_owner = msg.sender;
emit OwnershipTransferred(address(0), _owner);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return msg.sender == _owner;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* > Note: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File: contracts/ProxyReceiver/IERC1538.sol
pragma solidity ^0.5.0;
/// @title ERC1538 Transparent Contract Standard
/// @dev Required interface
/// Note: the ERC-165 identifier for this interface is 0x61455567
interface IERC1538 {
/// @dev This emits when one or a set of functions are updated in a transparent contract.
/// The message string should give a short description of the change and why
/// the change was made.
event CommitMessage(string message);
/// @dev This emits for each function that is updated in a transparent contract.
/// functionId is the bytes4 of the keccak256 of the function signature.
/// oldDelegate is the delegate contract address of the old delegate contract if
/// the function is being replaced or removed.
/// oldDelegate is the zero value address(0) if a function is being added for the
/// first time.
/// newDelegate is the delegate contract address of the new delegate contract if
/// the function is being added for the first time or if the function is being
/// replaced.
/// newDelegate is the zero value address(0) if the function is being removed.
event FunctionUpdate(bytes4 indexed functionId, address indexed oldDelegate, address indexed newDelegate, string functionSignature);
/// @notice Updates functions in a transparent contract.
/// @dev If the value of _delegate is zero then the functions specified
/// in _functionSignatures are removed.
/// If the value of _delegate is a delegate contract address then the functions
/// specified in _functionSignatures will be delegated to that address.
/// @param _delegate The address of a delegate contract to delegate to or zero
/// to remove functions.
/// @param _functionSignatures A list of function signatures listed one after the other
/// @param _commitMessage A short description of the change and why it is made
/// This message is passed to the CommitMessage event.
function updateContract(address _delegate, string calldata _functionSignatures, string calldata _commitMessage) external;
}
// File: contracts/ProxyReceiver/ProxyBaseStorage.sol
pragma solidity ^0.5.0;
///////////////////////////////////////////////////////////////////////////////////////////////////
/**
* @title ProxyBaseStorage
* @dev Defining base storage for the proxy contract.
*/
///////////////////////////////////////////////////////////////////////////////////////////////////
contract ProxyBaseStorage {
//////////////////////////////////////////// VARS /////////////////////////////////////////////
// maps functions to the delegate contracts that execute the functions.
// funcId => delegate contract
mapping(bytes4 => address) public delegates;
// array of function signatures supported by the contract.
bytes[] internal funcSignatures;
// maps each function signature to its position in the funcSignatures array.
// signature => index+1
mapping(bytes => uint256) internal funcSignatureToIndex;
// proxy address of itself, can be used for cross-delegate calls but also safety checking.
address proxy;
///////////////////////////////////////////////////////////////////////////////////////////////
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see `ERC20Detailed`.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a `Transfer` event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through `transferFrom`. This is
* zero by default.
*
* This value changes when `approve` or `transferFrom` are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* > Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an `Approval` event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a `Transfer` event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to `approve`. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0, "SafeMath: modulo by zero");
return a % b;
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Implementation of the `IERC20` interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using `_mint`.
* For a generic mechanism see `ERC20Mintable`.
*
* *For a detailed writeup see our guide [How to implement supply
* mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an `Approval` event is emitted on calls to `transferFrom`.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
* functions have been added to mitigate the well-known issues around setting
* allowances. See `IERC20.approve`.
*/
contract ERC20 is IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev See `IERC20.totalSupply`.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See `IERC20.balanceOf`.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev See `IERC20.transfer`.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
/**
* @dev See `IERC20.allowance`.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See `IERC20.approve`.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 value) public returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
/**
* @dev See `IERC20.transferFrom`.
*
* Emits an `Approval` event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of `ERC20`;
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `value`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to `approve` that can be used as a mitigation for
* problems described in `IERC20.approve`.
*
* Emits an `Approval` event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to `approve` that can be used as a mitigation for
* problems described in `IERC20.approve`.
*
* Emits an `Approval` event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to `transfer`, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a `Transfer` event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount);
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a `Transfer` event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destoys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a `Transfer` event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 value) internal {
require(account != address(0), "ERC20: burn from the zero address");
_totalSupply = _totalSupply.sub(value);
_balances[account] = _balances[account].sub(value);
emit Transfer(account, address(0), value);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an `Approval` event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 value) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = value;
emit Approval(owner, spender, value);
}
/**
* @dev Destoys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See `_burn` and `_approve`.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol
pragma solidity ^0.5.0;
/**
* @dev Optional functions from the ERC20 standard.
*/
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
* these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei.
*
* > Note that this information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* `IERC20.balanceOf` and `IERC20.transfer`.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
}
// File: contracts/ProxyToken.sol
pragma solidity ^0.5.0;
contract ProxyToken is
ERC20,
ERC20Detailed,
Ownable,
ProxyBaseStorage,
IERC1538
{
mapping(address => mapping(bytes4 => bool)) public WhiteListedCaller;
mapping(bytes4 => bool) public nonWhiteListed;
address balanceOfDelegate;
event balanceOfDelegateUpdated(address newDelegate);
constructor() public ERC20Detailed("Hercules", "HERC", 18) {
_mint(0x1a2a618f83e89efBD9C9C120AB38C1C2eC9c4E76, 234259085000000000000000000);
}
function updateBalanceDelegate(address _a) public onlyOwner() {
balanceOfDelegate = _a;
emit balanceOfDelegateUpdated(_a);
}
function WhiteListCaller(address a, bytes4 _function) public onlyOwner() {
WhiteListedCaller[a][_function] = true;
}
function deWhiteListCaller(address a, bytes4 _function) public onlyOwner() {
WhiteListedCaller[a][_function] = false;
}
function toggleFunctionWhiteListing(bytes4 _function) public onlyOwner() {
nonWhiteListed[_function] = !nonWhiteListed[_function];
}
function burn(uint256 _amount) public {
_burn(msg.sender, _amount);
}
function balanceOf(address _user, uint256 _id) public returns (uint256) {
bytes memory encoded = abi.encodeWithSelector(0x00fdd58e, _user, _id);
bool b;
bytes memory data;
(b, data) = balanceOfDelegate.delegatecall(encoded);
return abi.decode(data, (uint256));
}
function() external payable {
address delegate = delegates[msg.sig];
require(delegate != address(0), "Function does not exist.");
if (nonWhiteListed[msg.sig] == false) {
require(
WhiteListedCaller[msg.sender][msg.sig] == true,
"user needs to be whitelist to trigger external call"
);
}
assembly {
let ptr := mload(0x40)
calldatacopy(ptr, 0, calldatasize)
let result := delegatecall(gas, delegate, ptr, calldatasize, 0, 0)
let size := returndatasize
returndatacopy(ptr, 0, size)
switch result
case 0 {
revert(ptr, size)
}
default {
return(ptr, size)
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// @notice Updates functions in a transparent contract.
/// @dev If the value of _delegate is zero then the functions specified
/// in _functionSignatures are removed.
/// If the value of _delegate is a delegate contract address then the functions
/// specified in _functionSignatures will be delegated to that address.
/// @param _delegate The address of a delegate contract to delegate to or zero
/// @param _functionSignatures A list of function signatures listed one after the other
/// @param _commitMessage A short description of the change and why it is made
/// This message is passed to the CommitMessage event.
function updateContract(
address _delegate,
string calldata _functionSignatures,
string calldata _commitMessage
) external onlyOwner() {
// ***
// NEEDS SECURITY ADDING HERE, SUGGEST MULTI-ADDRESS APPROVAL SYSTEM OR EQUIVALENT.
// ***
// pos is first used to check the size of the delegate contract.
// After that pos is the current memory location of _functionSignatures.
// It is used to move through the characters of _functionSignatures
uint256 pos;
if (_delegate != address(0)) {
assembly {
pos := extcodesize(_delegate)
}
require(
pos > 0,
"_delegate address is not a contract and is not address(0)"
);
}
// creates a bytes version of _functionSignatures
bytes memory signatures = bytes(_functionSignatures);
// stores the position in memory where _functionSignatures ends.
uint256 signaturesEnd;
// stores the starting position of a function signature in _functionSignatures
uint256 start;
assembly {
pos := add(signatures, 32)
start := pos
signaturesEnd := add(pos, mload(signatures))
}
// the function id of the current function signature
bytes4 funcId;
// the delegate address that is being replaced or address(0) if removing functions
address oldDelegate;
// the length of the current function signature in _functionSignatures
uint256 num;
// the current character in _functionSignatures
uint256 char;
// the position of the current function signature in the funcSignatures array
uint256 index;
// the last position in the funcSignatures array
uint256 lastIndex;
// parse the _functionSignatures string and handle each function
for (; pos < signaturesEnd; pos++) {
assembly {
char := byte(0, mload(pos))
}
// 0x29 == )
if (char == 0x29) {
pos++;
num = (pos - start);
start = pos;
assembly {
mstore(signatures, num)
}
funcId = bytes4(keccak256(signatures));
oldDelegate = delegates[funcId];
if (_delegate == address(0)) {
index = funcSignatureToIndex[signatures];
require(index != 0, "Function does not exist.");
index--;
lastIndex = funcSignatures.length - 1;
if (index != lastIndex) {
funcSignatures[index] = funcSignatures[lastIndex];
funcSignatureToIndex[funcSignatures[lastIndex]] =
index +
1;
}
funcSignatures.length--;
delete funcSignatureToIndex[signatures];
delete delegates[funcId];
emit FunctionUpdate(
funcId,
oldDelegate,
address(0),
string(signatures)
);
} else if (funcSignatureToIndex[signatures] == 0) {
require(oldDelegate == address(0), "FuncId clash.");
delegates[funcId] = _delegate;
funcSignatures.push(signatures);
funcSignatureToIndex[signatures] = funcSignatures.length;
emit FunctionUpdate(
funcId,
address(0),
_delegate,
string(signatures)
);
} else if (delegates[funcId] != _delegate) {
delegates[funcId] = _delegate;
emit FunctionUpdate(
funcId,
oldDelegate,
_delegate,
string(signatures)
);
}
WhiteListedCaller[msg.sender][funcId] = true;
assembly {
signatures := add(signatures, num)
}
}
}
emit CommitMessage(_commitMessage);
}
}