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0x00000000000fe8503db73c68f1a1874eb9d86883.sol
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0x00000000000fe8503db73c68f1a1874eb9d86883.sol
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// File: contracts/Ownable.sol
pragma solidity 0.5.0;
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address private _owner;
address private _pendingOwner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The constructor sets the original owner of the contract to the sender account.
*/
constructor() public {
setOwner(msg.sender);
}
/**
* @dev Modifier throws if called by any account other than the pendingOwner.
*/
modifier onlyPendingOwner() {
require(msg.sender == _pendingOwner, "msg.sender should be onlyPendingOwner");
_;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == _owner, "msg.sender should be owner");
_;
}
/**
* @dev Tells the address of the pendingOwner
* @return The address of the pendingOwner
*/
function pendingOwner() public view returns (address) {
return _pendingOwner;
}
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function owner() public view returns (address ) {
return _owner;
}
/**
* @dev Sets a new owner address
* @param _newOwner The newOwner to set
*/
function setOwner(address _newOwner) internal {
_owner = _newOwner;
}
/**
* @dev Allows the current owner to set the pendingOwner address.
* @param _newOwner The address to transfer ownership to.
*/
function transferOwnership(address _newOwner) public onlyOwner {
_pendingOwner = _newOwner;
}
/**
* @dev Allows the pendingOwner address to finalize the transfer.
*/
function claimOwnership() public onlyPendingOwner {
emit OwnershipTransferred(_owner, _pendingOwner);
_owner = _pendingOwner;
_pendingOwner = address(0);
}
}
// File: contracts/Operable.sol
pragma solidity 0.5.0;
contract Operable is Ownable {
address private _operator;
event OperatorChanged(address indexed previousOperator, address indexed newOperator);
/**
* @dev Tells the address of the operator
* @return the address of the operator
*/
function operator() external view returns (address) {
return _operator;
}
/**
* @dev Only the operator can operate store
*/
modifier onlyOperator() {
require(msg.sender == _operator, "msg.sender should be operator");
_;
}
/**
* @dev update the storgeOperator
* @param _newOperator The newOperator to update
*/
function updateOperator(address _newOperator) public onlyOwner {
require(_newOperator != address(0), "Cannot change the newOperator to the zero address");
emit OperatorChanged(_operator, _newOperator);
_operator = _newOperator;
}
}
// File: contracts/utils/SafeMath.sol
pragma solidity 0.5.0;
/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
// File: contracts/TokenStore.sol
pragma solidity 0.5.0;
contract TokenStore is Operable {
using SafeMath for uint256;
uint256 public totalSupply;
string public name = "PingAnToken";
string public symbol = "PAT";
uint8 public decimals = 18;
mapping (address => uint256) public balances;
mapping (address => mapping (address => uint256)) public allowed;
function changeTokenName(string memory _name, string memory _symbol) public onlyOperator {
name = _name;
symbol = _symbol;
}
function addBalance(address _holder, uint256 _value) public onlyOperator {
balances[_holder] = balances[_holder].add(_value);
}
function subBalance(address _holder, uint256 _value) public onlyOperator {
balances[_holder] = balances[_holder].sub(_value);
}
function setBalance(address _holder, uint256 _value) public onlyOperator {
balances[_holder] = _value;
}
function addAllowance(address _holder, address _spender, uint256 _value) public onlyOperator {
allowed[_holder][_spender] = allowed[_holder][_spender].add(_value);
}
function subAllowance(address _holder, address _spender, uint256 _value) public onlyOperator {
allowed[_holder][_spender] = allowed[_holder][_spender].sub(_value);
}
function setAllowance(address _holder, address _spender, uint256 _value) public onlyOperator {
allowed[_holder][_spender] = _value;
}
function addTotalSupply(uint256 _value) public onlyOperator {
totalSupply = totalSupply.add(_value);
}
function subTotalSupply(uint256 _value) public onlyOperator {
totalSupply = totalSupply.sub(_value);
}
function setTotalSupply(uint256 _value) public onlyOperator {
totalSupply = _value;
}
}
// File: contracts/ERC20Interface.sol
pragma solidity 0.5.0;
interface ERC20Interface {
function totalSupply() external view returns (uint256);
function balanceOf(address holder) external view returns (uint256);
function allowance(address holder, address spender) external view returns (uint256);
function transfer(address to, uint256 value) external returns (bool);
function approve(address spender, uint256 value) external returns (bool);
function transferFrom(address from, address to, uint256 value) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed holder, address indexed spender, uint256 value);
}
// File: contracts/ERC20StandardToken.sol
pragma solidity 0.5.0;
contract ERC20StandardToken is ERC20Interface, Ownable {
TokenStore public tokenStore;
event TokenStoreSet(address indexed previousTokenStore, address indexed newTokenStore);
event ChangeTokenName(string newName, string newSymbol);
/**
* @dev ownership of the TokenStore contract
* @param _newTokenStore The address to of the TokenStore to set.
*/
function setTokenStore(address _newTokenStore) public onlyOwner returns (bool) {
emit TokenStoreSet(address(tokenStore), _newTokenStore);
tokenStore = TokenStore(_newTokenStore);
return true;
}
function changeTokenName(string memory _name, string memory _symbol) public onlyOwner {
tokenStore.changeTokenName(_name, _symbol);
emit ChangeTokenName(_name, _symbol);
}
function totalSupply() public view returns (uint256) {
return tokenStore.totalSupply();
}
function balanceOf(address _holder) public view returns (uint256) {
return tokenStore.balances(_holder);
}
function allowance(address _holder, address _spender) public view returns (uint256) {
return tokenStore.allowed(_holder, _spender);
}
function name() public view returns (string memory) {
return tokenStore.name();
}
function symbol() public view returns (string memory) {
return tokenStore.symbol();
}
function decimals() public view returns (uint8) {
return tokenStore.decimals();
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* 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
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(
address _spender,
uint256 _value
) public returns (bool success) {
require (_spender != address(0), "Cannot approve to the zero address");
tokenStore.setAllowance(msg.sender, _spender, _value);
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Increase the amount of tokens that an holder allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _addedValue The amount of tokens to increase the allowance by.
*/
function increaseApproval(
address _spender,
uint256 _addedValue
) public returns (bool success) {
require (_spender != address(0), "Cannot increaseApproval to the zero address");
tokenStore.addAllowance(msg.sender, _spender, _addedValue);
emit Approval(msg.sender, _spender, tokenStore.allowed(msg.sender, _spender));
return true;
}
/**
* @dev Decrease the amount of tokens that an holder allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseApproval(
address _spender,
uint256 _subtractedValue
) public returns (bool success) {
require (_spender != address(0), "Cannot decreaseApproval to the zero address");
tokenStore.subAllowance(msg.sender, _spender, _subtractedValue);
emit Approval(msg.sender, _spender, tokenStore.allowed(msg.sender, _spender));
return true;
}
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(
address _from,
address _to,
uint256 _value
) public returns (bool success) {
require(_to != address(0), "Cannot transfer to zero address");
tokenStore.subAllowance(_from, msg.sender, _value);
tokenStore.subBalance(_from, _value);
tokenStore.addBalance(_to, _value);
emit Transfer(_from, _to, _value);
return true;
}
/**
* @dev Transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(
address _to,
uint256 _value
) public returns (bool success) {
require (_to != address(0), "Cannot transfer to zero address");
tokenStore.subBalance(msg.sender, _value);
tokenStore.addBalance(_to, _value);
emit Transfer(msg.sender, _to, _value);
return true;
}
}
// File: contracts/PausableToken.sol
pragma solidity 0.5.0;
contract PausableToken is ERC20StandardToken {
address private _pauser;
bool public paused = false;
event Pause();
event Unpause();
event PauserChanged(address indexed previousPauser, address indexed newPauser);
/**
* @dev Tells the address of the pauser
* @return The address of the pauser
*/
function pauser() public view returns (address) {
return _pauser;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused, "state shouldn't be paused");
_;
}
/**
* @dev throws if called by any account other than the pauser
*/
modifier onlyPauser() {
require(msg.sender == _pauser, "msg.sender should be pauser");
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() public onlyPauser {
paused = true;
emit Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() public onlyPauser {
paused = false;
emit Unpause();
}
/**
* @dev update the pauser role
* @param _newPauser The newPauser to update
*/
function updatePauser(address _newPauser) public onlyOwner {
require(_newPauser != address(0), "Cannot update the newPauser to the zero address");
emit PauserChanged(_pauser, _newPauser);
_pauser = _newPauser;
}
function approve(
address _spender,
uint256 _value
) public whenNotPaused returns (bool success) {
return super.approve(_spender, _value);
}
function increaseApproval(
address _spender,
uint256 _addedValue
) public whenNotPaused returns (bool success) {
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(
address _spender,
uint256 _subtractedValue
) public whenNotPaused returns (bool success) {
return super.decreaseApproval(_spender, _subtractedValue);
}
function transferFrom(
address _from,
address _to,
uint256 _value
) public whenNotPaused returns (bool success) {
return super.transferFrom(_from, _to, _value);
}
function transfer(
address _to,
uint256 _value
) public whenNotPaused returns (bool success) {
return super.transfer(_to, _value);
}
}
// File: contracts/BlacklistStore.sol
pragma solidity 0.5.0;
contract BlacklistStore is Operable {
mapping (address => uint256) public blacklisted;
/**
* @dev Checks if account is blacklisted
* @param _account The address to check
* @param _status The address status
*/
function setBlacklist(address _account, uint256 _status) public onlyOperator {
blacklisted[_account] = _status;
}
}
// File: contracts/BlacklistableToken.sol
pragma solidity 0.5.0;
/**
* @title BlacklistableToken
* @dev Allows accounts to be blacklisted by a "blacklister" role
*/
contract BlacklistableToken is PausableToken {
BlacklistStore public blacklistStore;
address private _blacklister;
event BlacklisterChanged(address indexed previousBlacklister, address indexed newBlacklister);
event BlacklistStoreSet(address indexed previousBlacklistStore, address indexed newblacklistStore);
event Blacklist(address indexed account, uint256 _status);
/**
* @dev Throws if argument account is blacklisted
* @param _account The address to check
*/
modifier notBlacklisted(address _account) {
require(blacklistStore.blacklisted(_account) == 0, "Account in the blacklist");
_;
}
/**
* @dev Throws if called by any account other than the blacklister
*/
modifier onlyBlacklister() {
require(msg.sender == _blacklister, "msg.sener should be blacklister");
_;
}
/**
* @dev Tells the address of the blacklister
* @return The address of the blacklister
*/
function blacklister() public view returns (address) {
return _blacklister;
}
/**
* @dev Set the blacklistStore
* @param _newblacklistStore The blacklistStore address to set
*/
function setBlacklistStore(address _newblacklistStore) public onlyOwner returns (bool) {
emit BlacklistStoreSet(address(blacklistStore), _newblacklistStore);
blacklistStore = BlacklistStore(_newblacklistStore);
return true;
}
/**
* @dev Update the blacklister
* @param _newBlacklister The newBlacklister to update
*/
function updateBlacklister(address _newBlacklister) public onlyOwner {
require(_newBlacklister != address(0), "Cannot update the blacklister to the zero address");
emit BlacklisterChanged(_blacklister, _newBlacklister);
_blacklister = _newBlacklister;
}
/**
* @dev Checks if account is blacklisted
* @param _account The address status to query
* @return the address status
*/
function queryBlacklist(address _account) public view returns (uint256) {
return blacklistStore.blacklisted(_account);
}
/**
* @dev Adds account to blacklist
* @param _account The address to blacklist
* @param _status The address status to change
*/
function changeBlacklist(address _account, uint256 _status) public onlyBlacklister {
blacklistStore.setBlacklist(_account, _status);
emit Blacklist(_account, _status);
}
function approve(
address _spender,
uint256 _value
) public notBlacklisted(msg.sender) notBlacklisted(_spender) returns (bool success) {
return super.approve(_spender, _value);
}
function increaseApproval(
address _spender,
uint256 _addedValue
) public notBlacklisted(msg.sender) notBlacklisted(_spender) returns (bool success) {
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(
address _spender,
uint256 _subtractedValue
) public notBlacklisted(msg.sender) notBlacklisted(_spender) returns (bool success) {
return super.decreaseApproval(_spender, _subtractedValue);
}
function transferFrom(
address _from,
address _to,
uint256 _value
) public notBlacklisted(_from) notBlacklisted(_to) notBlacklisted(msg.sender) returns (bool success) {
return super.transferFrom(_from, _to, _value);
}
function transfer(
address _to,
uint256 _value
) public notBlacklisted(msg.sender) notBlacklisted(_to) returns (bool success) {
return super.transfer(_to, _value);
}
}
// File: contracts/BurnableToken.sol
pragma solidity 0.5.0;
contract BurnableToken is BlacklistableToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev holder can burn some of its own tokens
* amount is less than or equal to the minter's account balance
* @param _value uint256 the amount of tokens to be burned
*/
function burn(
uint256 _value
) public whenNotPaused notBlacklisted(msg.sender) returns (bool success) {
tokenStore.subBalance(msg.sender, _value);
tokenStore.subTotalSupply(_value);
emit Burn(msg.sender, _value);
emit Transfer(msg.sender, address(0), _value);
return true;
}
}
// File: contracts/MintableToken.sol
pragma solidity 0.5.0;
contract MintableToken is BlacklistableToken {
event MinterChanged(address indexed previousMinter, address indexed newMinter);
event Mint(address indexed minter, address indexed to, uint256 value);
address private _minter;
modifier onlyMinter() {
require(msg.sender == _minter, "msg.sender should be minter");
_;
}
/**
* @dev Tells the address of the blacklister
* @return The address of the blacklister
*/
function minter() public view returns (address) {
return _minter;
}
/**
* @dev update the minter
* @param _newMinter The newMinter to update
*/
function updateMinter(address _newMinter) public onlyOwner {
require(_newMinter != address(0), "Cannot update the newPauser to the zero address");
emit MinterChanged(_minter, _newMinter);
_minter = _newMinter;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _value The amount of tokens to mint. Must be less than or equal to the minterAllowance of the caller.
* @return A boolean that indicates if the operation was successful.
*/
function mint(
address _to,
uint256 _value
) public onlyMinter whenNotPaused notBlacklisted(msg.sender) notBlacklisted(_to) returns (bool) {
require(_to != address(0), "Cannot mint to zero address");
tokenStore.addTotalSupply(_value);
tokenStore.addBalance(_to, _value);
emit Mint(msg.sender, _to, _value);
emit Transfer(address(0), _to, _value);
return true;
}
}
// File: contracts/PingAnToken.sol
pragma solidity 0.5.0;
contract PingAnToken is BurnableToken, MintableToken {
/**
* contract only can initialized once
*/
bool private initialized = true;
/**
* @dev sets 0 initials tokens, the owner.
* this serves as the constructor for the proxy but compiles to the
* memory model of the Implementation contract.
* @param _owner The owner to initials
*/
function initialize(address _owner) public {
require(!initialized, "already initialized");
require(_owner != address(0), "Cannot initialize the owner to zero address");
setOwner(_owner);
initialized = true;
}
}