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pragma solidity ^0.4.24;
contract Ownable {
address public owner;
constructor() public {
owner = msg.sender;
}
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) public onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}
}
contract HelpingBlocksContract is Ownable {
string public name;
string public symbol;
uint public decimals;
uint public totalSupply;
string public description;
bool public donationClosed = false;
mapping (address => uint256) public balanceOf;
mapping (address => uint256) public myDonation;
event Transfer(address indexed from, address indexed to, uint256 value);
constructor() public {
name = 'Helping Blocks Token';
symbol = 'HBT';
decimals = 0;
totalSupply = 10000000;
description = "Kerala Flood Relief Fund";
balanceOf[owner] = totalSupply;
}
function _transfer(address _from, address _to, uint _value) internal {
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
}
function transfer(address _to, uint256 _value) public onlyOwner returns(bool success) {
_transfer(owner, _to, _value);
return true;
}
function disableDonation() public onlyOwner returns(bool success) {
donationClosed = true;
return true;
}
function enableDonation() public onlyOwner returns(bool success) {
donationClosed = false;
return true;
}
function setDescription(string str) public onlyOwner returns(bool success) {
description = str;
return true;
}
function () payable public {
require(!donationClosed);
myDonation[msg.sender] += msg.value;
if (balanceOf[msg.sender] < 1) {
_transfer(owner, msg.sender, 1);
}
}
function safeWithdrawal(uint256 _value) payable public onlyOwner {
owner.transfer(_value);
}
} |