///<remarks>
/// END user configurable fields
///</remarks>
/// <summary>
/// the entry point for smart contract execution
/// </summary>
/// <param name="operation">string to determine execution operation performed</param>
/// <param name="args">optional arguments, context specific depending on operation</param>
/// <returns></returns>
public static object Main(string operation, params object[] args)
{
if (Runtime.Trigger == TriggerType.Application)
{
// test if a nep5 method is being invoked
foreach (string nepMethod in NEP5.GetNEP5Methods())
{
if (nepMethod == operation)
{
return(NEP5.HandleNEP5Operation(operation, args, ExecutionEngine.CallingScriptHash, ExecutionEngine.EntryScriptHash));
}
}
// test if a kyc method is being invoked
foreach (string kycMethod in KYC.GetKYCMethods())
{
if (kycMethod == operation)
{
return(KYC.HandleKYCOperation(operation, args));
}
}
// test if a helper/misc method is being invoked
foreach (string helperMethod in Helpers.GetHelperMethods())
{
if (helperMethod == operation)
{
return(Helpers.HandleHelperOperation(operation, args));
}
}
if (operation == "admin" && Helpers.VerifyIsAdminAccount())
{
// allow access to administration methods
string adminOperation = (string)args[0];
foreach (string adminMethod in Administration.GetAdministrationMethods())
{
if (adminMethod == adminOperation)
{
return(Administration.HandleAdministrationOperation(adminOperation, args));
}
}
return(false);
}
}
else if (Runtime.Trigger == TriggerType.Verification)
{
if (Helpers.VerifyIsAdminAccount())
{
return(true);
}
// test if this transaction is allowed
object[] transactionData = Helpers.GetTransactionAndSaleData();
return(TokenSale.CanUserParticipateInSale(transactionData));
}
return(false);
}
/// <summary>
/// determine if user can participate in the token sale yet
/// </summary>
/// <param name="sender"></param>
/// <returns></returns>
public static bool CanUserParticipateInSale(object[] transactionData)
{
Transaction tx = (Transaction)transactionData[0];
byte[] sender = (byte[])transactionData[1];
byte[] receiver = (byte[])transactionData[2];
ulong receivedNEO = (ulong)transactionData[3];
ulong receivedGAS = (ulong)transactionData[4];
BigInteger whiteListGroupNumber = (BigInteger)transactionData[5];
BigInteger crowdsaleAvailableAmount = (BigInteger)transactionData[6];
BigInteger groupMaximumContribution = (BigInteger)transactionData[7];
BigInteger totalTokensPurchased = (BigInteger)transactionData[8];
BigInteger neoRemainingAfterPurchase = (BigInteger)transactionData[9];
BigInteger gasRemainingAfterPurchase = (BigInteger)transactionData[10];
BigInteger totalContributionBalance = (BigInteger)transactionData[11];
if (whiteListGroupNumber <= 0)
{
Runtime.Notify("CanUserParticipate() sender is not whitelisted", sender);
return(false);
}
if (!KYC.GroupParticipationIsUnlocked((int)whiteListGroupNumber))
{
Runtime.Notify("CanUserParticipate() sender cannot participate yet", sender);
return(false);
}
if (crowdsaleAvailableAmount <= 0)
{
// total supply has been exhausted
Runtime.Notify("CanUserParticipate() crowdsaleAvailableAmount is <= 0", crowdsaleAvailableAmount);
return(false);
}
if (totalContributionBalance > groupMaximumContribution)
{
// don't allow this purchase exceed the group cap
Runtime.Notify("CanUserParticipate() senders purchase will exceed maxContribution cap", sender, totalContributionBalance, groupMaximumContribution);
refund(sender, receivedNEO, receivedGAS);
return(false);
}
return(true);
}
/// <summary>
/// retrieve information for the received transaction
/// </summary>
/// <returns>object[] {
/// (Transaction)tx, (byte[])sender, (byte)receiver, ulong receivedNEO, ulong receivedGAS,
/// (BigInteger)whiteListGroupNumber, (BigInteger)crowdsaleAvailableAmount, (BigInteger)groupMaximumContribution
/// (BigInteger)totalTokensPurchased, (BigInteger)neoRemainingAfterPurchase, (BigInteger)gasRemainingAfterPurchase
/// (BigInteger)totalContributionBalance
/// }
/// </returns>
public static object[] GetEthTransactionAndSaleData(ulong receivedETH, string ethAddress, byte[] neoAddress)
{
Transaction tx = (Transaction)ExecutionEngine.ScriptContainer;
byte[] sender = neoAddress;
byte[] receiver = neoAddress;
// only add funds to total received value if receiver is the recipient of the output
Runtime.Notify("GetEthTransactionData() Received ETH Deposit type", receiver);
BigInteger whiteListGroupNumber = KYC.GetWhitelistGroupNumber(sender);
BigInteger crowdsaleAvailableAmount = NEP5.CrowdsaleAvailableAmount();
BigInteger groupMaximumContribution = KYC.GetGroupMaxContribution(whiteListGroupNumber) * NEP5.factor;
BigInteger totalTokensPurchased = 0;
//ETH minimum must be 0.1 eth
if (ICOTemplate.ICOAllowsETH() && receivedETH >= ICOTemplate.EthMinimumContribution())
{
//Get the amount of tokens in exchange for contributed ETH. receivedETH is with 18 decimals so divide by 1000000000000000000.
BigInteger ethTokenValue = receivedETH * ICOTemplate.ICOEthToTokenExchangeRate() / 1000000000000000000;
// there is enough NOS left for this purchase to complete
totalTokensPurchased = ethTokenValue;
// ensure amountAvailable now reflects number of tokens purchased with ETH
}
BigInteger totalContributionBalance = BalanceOfSaleContribution(sender) + (totalTokensPurchased * NEP5.factor);
return(new object[] {
tx, // neo transaction object
sender, // who initiated the transfer
receiver, // who the assets were sent to
ethAddress, // ETH address of contributor
receivedETH, // how many neo were transferred
whiteListGroupNumber, // what whitelist group is the sender in
crowdsaleAvailableAmount, // how many tokens are left to be purchased
groupMaximumContribution, // how many tokens can members of this whitelist group purchase
totalTokensPurchased, // the total number of tokens purchased in this transaction
totalContributionBalance // the total amount of tokens sender has purchased during public sale
});
}
/// <summary>
/// retrieve information for the received transaction
/// </summary>
/// <returns>object[] {
/// (Transaction)tx, (byte[])sender, (byte)receiver, ulong receivedNEO, ulong receivedGAS,
/// (BigInteger)whiteListGroupNumber, (BigInteger)crowdsaleAvailableAmount, (BigInteger)groupMaximumContribution
/// (BigInteger)totalTokensPurchased, (BigInteger)neoRemainingAfterPurchase, (BigInteger)gasRemainingAfterPurchase
/// (BigInteger)totalContributionBalance
/// }
/// </returns>
public static object[] GetTransactionAndSaleData()
{
Transaction tx = (Transaction)ExecutionEngine.ScriptContainer;
TransactionOutput[] inputs = tx.GetReferences();
TransactionOutput reference = inputs[0];
TransactionOutput[] outputs = tx.GetOutputs();
byte[] sender = reference.ScriptHash;
byte[] receiver = ExecutionEngine.ExecutingScriptHash;
ulong receivedNEO = 0;
ulong receivedGAS = 0;
foreach (var input in inputs)
{
// ensure that the provided inputs are valid
if (input.ScriptHash == receiver)
{
throw new System.Exception();
}
}
foreach (TransactionOutput output in outputs)
{
if (output.ScriptHash == receiver)
{
// only add funds to total received value if receiver is the recipient of the output
ulong receivedValue = (ulong)output.Value;
Runtime.Notify("GetTransactionData() Received Deposit type", receiver, reference.AssetId);
if (reference.AssetId == NEP5.NEO)
{
receivedNEO += receivedValue;
}
else if (reference.AssetId == NEP5.GAS)
{
receivedGAS += receivedValue;
}
}
}
BigInteger whiteListGroupNumber = KYC.GetWhitelistGroupNumber(sender);
BigInteger crowdsaleAvailableAmount = NEP5.CrowdsaleAvailableAmount();
BigInteger groupMaximumContribution = KYC.GetGroupMaxContribution(whiteListGroupNumber) * NEP5.factor;
BigInteger totalTokensPurchased = 0;
BigInteger neoRemainingAfterPurchase = 0;
BigInteger gasRemainingAfterPurchase = 0;
BigInteger runningCrowdsaleAmount = crowdsaleAvailableAmount;
if (ICOTemplate.ICOAllowsNEO() && receivedNEO > 0)
{
BigInteger neoTokenValue = receivedNEO * ICOTemplate.ICONeoToTokenExchangeRate();
if (neoTokenValue > runningCrowdsaleAmount)
{
// the user is trying to purchase more tokens than are available
// figure out how much NOS can be purchased without exceeding the cap
neoRemainingAfterPurchase = (neoTokenValue - runningCrowdsaleAmount) / (ICOTemplate.ICONeoToTokenExchangeRate());
totalTokensPurchased = runningCrowdsaleAmount;
}
else
{
// there is enough NOS left for this purchase to complete
totalTokensPurchased = neoTokenValue;
}
// ensure amountAvailable now reflects number of tokens purchased with NEO
runningCrowdsaleAmount -= totalTokensPurchased;
}
if (ICOTemplate.ICOAllowsGAS() && receivedGAS > 0)
{
BigInteger gasTokenValue = receivedGAS * ICOTemplate.ICOGasToTokenExchangeRate();
if (gasTokenValue > runningCrowdsaleAmount)
{
// the user is trying to purchase more tokens than are available
// figure out how much NOS can be purchased without exceeding the cap
gasRemainingAfterPurchase = (gasTokenValue - runningCrowdsaleAmount) / (ICOTemplate.ICOGasToTokenExchangeRate());
totalTokensPurchased = totalTokensPurchased + runningCrowdsaleAmount;
}
else
{
totalTokensPurchased = totalTokensPurchased + gasTokenValue;
}
}
BigInteger totalContributionBalance = BalanceOfSaleContribution(sender) + totalTokensPurchased;
return(new object[] {
tx, // neo transaction object
sender, // who initiated the transfer
receiver, // who the assets were sent to
receivedNEO, // how many neo were transferred
receivedGAS, // how many gas were transferred
whiteListGroupNumber, // what whitelist group is the sender in
crowdsaleAvailableAmount, // how many tokens are left to be purchased
groupMaximumContribution, // how many tokens can members of this whitelist group purchase
totalTokensPurchased, // the total number of tokens purchased in this transaction
neoRemainingAfterPurchase, // how much neo is left after purchase of tokens
gasRemainingAfterPurchase, // how much gas is left after purchase of tokens
totalContributionBalance // the total amount of tokens sender has purchased during public sale
});
}
///<remarks>
/// END user configurable fields
///</remarks>
/// <summary>
/// the entry point for smart contract execution
/// </summary>
/// <param name="operation">string to determine execution operation performed</param>
/// <param name="args">optional arguments, context specific depending on operation</param>
/// <returns></returns>
public static object Main(string operation, params object[] args)
{
if (Runtime.Trigger == TriggerType.Application)
{
//Only allow InitSmartContract if contract not initialized and not calling whitelist/KYC operations
if(!Helpers.ContractInitialised() && ((operation != "admin" && (string) args[0] != "InitSmartContract") && operation != "AddAddress" && operation != "RevokeAddress" && operation != "GetGroupNumber" && operation != "crowdsale_status"))
{
Runtime.Log("Smart Contract not Initialised");
return false;
}
if (operation == "admin" && Helpers.VerifyIsAdminAccount())
{
// allow access to administration methods
string adminOperation = (string)args[0];
foreach (string adminMethod in Administration.GetAdministrationMethods())
{
if (adminMethod == adminOperation)
{
return Administration.HandleAdministrationOperation(adminOperation, args);
}
}
return false;
}
// test if a nep5 method is being invoked
foreach (string nepMethod in NEP5.GetNEP5Methods())
{
if (nepMethod == operation)
{
return NEP5.HandleNEP5Operation(operation, args, ExecutionEngine.CallingScriptHash, ExecutionEngine.EntryScriptHash);
}
}
// test if a kyc method is being invoked
foreach (string kycMethod in KYC.GetKYCMethods())
{
if (kycMethod == operation)
{
return KYC.HandleKYCOperation(operation, args);
}
}
// test if a helper/misc method is being invoked
foreach (string helperMethod in Helpers.GetHelperMethods())
{
if (helperMethod == operation)
{
return Helpers.HandleHelperOperation(operation, args);
}
}
//If MintTokensEth operation
if(operation == "MintTokensEth")
{
// Method can only be called by the ETH contributions listener account
if (Helpers.VerifyWitness(ICOTemplate.EthContributionListenerKey) && Helpers.RequireArgumentLength(args,3))
{
return EthSale.MintTokensEth((string)args[0], (byte[])args[1], (ulong)args[2]);
}
}
}
else if (Runtime.Trigger == TriggerType.Verification)
{
if (Helpers.VerifyIsAdminAccount())
{
return true;
}
// test if this transaction is allowed
object[] transactionData = Helpers.GetTransactionAndSaleData();
return TokenSale.CanUserParticipateInSale(transactionData);
}
return false;
}