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pragma solidity 0.4.25;
import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
contract ERC20Vendable is ERC20, Ownable {
address public vendingMachine;
string public name;
string public symbol;
uint8 public decimals = 18;
constructor(string memory _name, string memory _symbol) public {
name = _name;
symbol = _symbol;
modifier onlyVendingMachine() {
require(msg.sender == vendingMachine);
//to emulate how we send data with a transaction, we do that here on a token transfer to enable similar chat in the burner
function transferWithData(address to, uint256 value, bytes data) public returns (bool) {
emit TransferWithData(msg.sender,to,value,data);
return transfer(to, value);
event TransferWithData(address indexed from, address indexed to, uint256 value, bytes data);
//Ideally the Vending Machine would actually create the ERC20Vendable,
//and we could make mint and burn onlyCreator.
//However, to get the ERC20 contract deployed before we have all of the VendingMachine stuff ready,
//the ability to change is required to allow us to keep iterating on the VendingMachine design
function changeVendingMachine(address newVendingMachine) onlyOwner {
vendingMachine = newVendingMachine;
* @dev Function to mint tokens
* @param to The address that will receive the minted tokens.
* @param amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
function mint(address to, uint256 amount) public onlyVendingMachine returns (bool) {
_mint(to, amount);
return true;
* @dev Burns a specific amount of tokens.
* This is different then the standard Burnable definition.
* We only want the vending machine to be able to burn the tokens, but we don't want to require
* the two step approve and burnFrom which the standard case would require.
* @param from The address of which tokens should be burned away from.
* @param value The amount of token to be burned.
function burn(address from, uint256 value) public onlyVendingMachine returns (bool) {
_burn(from, value);
return true;