Permalink
Switch branches/tags
Nothing to show
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
367 lines (310 sloc) 13.1 KB
pragma solidity 0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
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 c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract owned {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) onlyOwner public {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract Pausable is owned {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused public {
paused = true;
emit Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
emit Unpause();
}
}
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }
interface ERC20Token {
/// @param _owner The address from which the balance will be retrieved
/// @return The balance
function balanceOf(address _owner) view external returns (uint256 balance);
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint256 _value) external returns (bool success);
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
/// @param _from The address of the sender
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
}
contract StandardToken is ERC20Token, Pausable {
using SafeMath for uint;
/**
Mitigation for short address attack
*/
modifier onlyPayloadSize(uint size) {
assert(msg.data.length >= size.add(4));
_;
}
/**
* @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) onlyPayloadSize(2 * 32) whenNotPaused external returns (bool success) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
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) onlyPayloadSize(3 * 32) whenNotPaused external returns (bool success) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
function balanceOf(address _owner) view external returns (uint256 balance) {
return balances[_owner];
}
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
/// @param _spender The address of the account able to transfer the tokens
/// @param _value The amount of wei to be approved for transfer
/// @return Whether the approval was successful or not
function approve(address _spender, uint256 _value) whenNotPaused public returns (bool success) {
require((_value == 0) || (allowed[msg.sender][_spender] == 0));
require(_value <= balances[msg.sender]);
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens allowed to spent
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/**
* @dev Increase the amount of tokens that an owner 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) whenNotPaused public returns (bool)
{
allowed[msg.sender][_spender] = (allowed[msg.sender][_spender].add(_addedValue));
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner 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) whenNotPaused public returns (bool)
{
uint256 oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
mapping (address => uint256) public balances;
mapping (address => mapping (address => uint256)) public allowed;
uint256 public _totalSupply;
}
//The Contract Name
contract GFT is StandardToken{
using SafeMath for uint;
/* Public variables of the token */
/*
NOTE:
The following variables are OPTIONAL vanities. One does not have to include them.
They allow one to customise the token contract & in no way influences the core functionality.
Some wallets/interfaces might not even bother to look at this information.
*/
string public name; //fancy name: eg Simon Bucks
uint8 public decimals; //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
string public symbol; //An identifier: eg SBX
string public version = 'V1.0'; //Version 0.1 standard. Just an arbitrary versioning scheme.
uint256 private fulltoken;
// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);
//
// CHANGE THESE VALUES FOR YOUR TOKEN
//
//make sure this function name matches the contract name above. ERC20Token
constructor(
) public{
fulltoken = 1500000000;
decimals = 3; // Amount of decimals for display purposes
_totalSupply = fulltoken.mul(10 ** uint256(decimals)); // Update total supply (100000 for example)
balances[msg.sender] = _totalSupply; // Give the creator all initial tokens (100000 for example)
name = "GFT"; // Set the name for display purposes
symbol = "GFT"; // Set the symbol for display purposes
}
function() public {
//not payable fallback function
revert();
}
/**
* Set allowance for other address and notify
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
* @param _extraData some extra information to send to the approved contract
*/
function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/// @return total amount of tokens
function totalSupply() public view returns (uint256 supply){
return _totalSupply;
}
/**
* Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) onlyOwner public returns (bool success) {
require(balances[msg.sender] >= _value); // Check if the sender has enough
balances[msg.sender] = balances[msg.sender].sub(_value); // Subtract from the sender
_totalSupply = _totalSupply.sub(_value); // Updates totalSupply
emit Burn(msg.sender, _value);
emit Transfer(msg.sender, address(0), _value);
return true;
}
/**
* Destroy tokens from other account
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) onlyOwner public returns (bool success) {
require(balances[_from] >= _value); // Check if the targeted balance is enough
require(_value <= allowed[_from][msg.sender]); // Check allowance
balances[_from] = balances[_from].sub(_value); // Subtract from the targeted balance
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); // Subtract from the sender's allowance
_totalSupply = _totalSupply.sub(_value); // Update totalSupply
emit Burn(_from, _value);
emit Transfer(_from, address(0), _value);
return true;
}
function onlyPayForFuel() public payable onlyOwner{
// Owner will pay in contract to bear the gas price if transactions made from contract
}
function withdrawEtherFromcontract(uint _amountInwei) public onlyOwner{
require(address(this).balance > _amountInwei);
require(msg.sender == owner);
owner.transfer(_amountInwei);
}
function withdrawTokensFromContract(uint _amountOfTokens) public onlyOwner{
require(balances[this] >= _amountOfTokens);
require(msg.sender == owner);
balances[msg.sender] = balances[msg.sender].add(_amountOfTokens); // adds the amount to owner's balance
balances[this] = balances[this].sub(_amountOfTokens); // subtracts the amount from contract balance
emit Transfer(this, msg.sender, _amountOfTokens); // execute an event reflecting the change
}
/* Get the contract constant _name */
function name() public view returns (string _name) {
return name;
}
/* Get the contract constant _symbol */
function symbol() public view returns (string _symbol) {
return symbol;
}
/* Get the contract constant _decimals */
function decimals() public view returns (uint8 _decimals) {
return decimals;
}
}