public static void OnNEP17Payment(UInt160 from, BigInteger amount, object data)
{
if (AssetStorage.GetPaymentStatus())
{
if (ExecutionEngine.CallingScriptHash == NEO.Hash)
{
Mint(amount * TokensPerNEO);
}
else if (ExecutionEngine.CallingScriptHash == GAS.Hash)
{
if (from != null)
{
Mint(amount * TokensPerGAS);
}
}
else
{
throw new Exception("Wrong calling script hash");
}
}
else
{
throw new Exception("Payment is disable on this contract!");
}
}
public static bool Transfer(UInt160 from, UInt160 to, BigInteger amount, object data)
{
if (amount <= 0)
{
throw new Exception("The parameter amount MUST be greater than 0.");
}
if (!Runtime.CheckWitness(from) && !from.Equals(ExecutionEngine.CallingScriptHash))
{
throw new Exception("No authorization.");
}
if (AssetStorage.Get(from) < amount)
{
throw new Exception("Insufficient balance.");
}
if (from == to)
{
return(true);
}
AssetStorage.Reduce(from, amount);
AssetStorage.Increase(to, amount);
OnTransfer(from, to, amount);
// Validate payable
if (ContractManagement.GetContract(to) != null)
{
Contract.Call(to, "onNEP17Payment", CallFlags.All, new object[] { from, amount, data });
}
return(true);
}
public static void DisablePayment()
{
if (!IsOwner())
{
throw new Exception("No authorization.");
}
AssetStorage.Disable();
}
public static void _deploy(object data, bool update)
{
if (update)
{
return;
}
if (TotalSupplyStorage.Get() > 0)
{
throw new Exception("Contract has been deployed.");
}
TotalSupplyStorage.Increase(InitialSupply);
AssetStorage.Increase(Owner, InitialSupply);
OnTransfer(null, Owner, InitialSupply);
}
private static void Mint(BigInteger amount)
{
var totalSupply = TotalSupplyStorage.Get();
var avaliable_supply = MaxSupply - totalSupply;
if (amount <= 0)
{
throw new Exception("Amount must be greater than zero.");
}
if (amount > avaliable_supply)
{
throw new Exception("Insufficient supply for mint tokens.");
}
Transaction tx = (Transaction)ExecutionEngine.ScriptContainer;
AssetStorage.Increase(tx.Sender, amount);
TotalSupplyStorage.Increase(amount);
OnTransfer(null, tx.Sender, amount);
}
public static BigInteger BalanceOf(UInt160 account) => AssetStorage.Get(account);