/// <summary>
/// transfer an amount from the "from" account to the "to" acount if the "spender" has been approved to transfer the requested amount.
/// </summary>
/// <param name="spender"></param>
/// <param name="from"></param>
/// <param name="to"></param>
/// <param name="amount"></param>
/// <param name="caller"></param>
/// <param name="entry"></param>
/// <returns></returns>
public static bool TransferFrom(byte[] spender, byte[] from, byte[] to, BigInteger amount, byte[] caller, byte[] entry)
{
if (caller != entry && !Helpers.IsContractWhitelistedDEX(caller))
{
spender = caller;
}
if (spender.Length != 20 || from.Length != 20 || to.Length != 20)
{
Runtime.Log("TransferFrom() (originator|from|to).Length != 20");
return(false);
}
if (amount < 0 || from == to)
{
Runtime.Log("TransferFrom() invalid transfer amount must be >= 0");
throw new Exception();
}
BigInteger approvedTransferAmount = Allowance(from, spender); // how many tokens is the spender authorised to transfer from the "from" account
if (!Runtime.CheckWitness(spender))
{
// ensure transaction is signed properly by the request originator
Runtime.Log("TransferFrom() CheckWitness failed");
return(false);
}
//At this point, vesting is complete for all but founders and project.
//Check if vesting applies and resolve.
BigInteger recipientAmountSubjectToVesting = 0;
BigInteger senderAmountSubjectToVesting = 0;
// reduce gas usage by only checking vesting criteria if the from address is a project or founders key
if (Helpers.IsProjectKey(from))
{
senderAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(from);
}
BigInteger fromBalance = BalanceOfRaw(from); // retrieve balance of authorised account
if (approvedTransferAmount < amount || fromBalance - senderAmountSubjectToVesting < amount)
{
// don't transfer if funds not available
Runtime.Notify("TransferFrom() (authorisedAmount|fromBalance) < transferValue", approvedTransferAmount, fromBalance, amount);
return(false);
}
BigInteger recipientBalance = BalanceOfRaw(to);
BigInteger newBalance = fromBalance - amount;
Helpers.SetBalanceOf(from, newBalance); // remove balance from originating account
Helpers.SetBalanceOf(to, recipientBalance + amount); // set new balance for destination account
Helpers.SetAllowanceAmount(from.Concat(spender), approvedTransferAmount - amount); // deduct transferred amount from allowance
transfer(from, to, amount);
return(true);
}
/// <summary>
/// transfer an amount from the "from" account to the "to" acount if the "spender" has been approved to transfer the requested amount.
/// </summary>
/// <param name="spender"></param>
/// <param name="from"></param>
/// <param name="to"></param>
/// <param name="amount"></param>
/// <param name="caller"></param>
/// <param name="entry"></param>
/// <returns></returns>
public static bool TransferFrom(byte[] spender, byte[] from, byte[] to, BigInteger amount, byte[] caller, byte[] entry)
{
if (caller != entry && !Helpers.IsContractWhitelistedDEX(caller))
{
spender = caller;
}
if (spender.Length != 20 || from.Length != 20 || to.Length != 20)
{
Runtime.Log("TransferFrom() (spender|from|to).Length != 20");
return(false);
}
if (amount < 0)
{
Runtime.Log("TransferFrom() invalid transfer amount must be >= 0");
throw new Exception();
}
BigInteger approvedTransferAmount = Allowance(from, spender); // how many tokens is this address authorised to transfer
BigInteger fromBalance = BalanceOf(from); // retrieve balance of authorised account
if (approvedTransferAmount < amount || fromBalance < amount)
{
// don't transfer if funds not available
Runtime.Notify("TransferFrom() (authorisedAmount|fromBalance) < transferValue", approvedTransferAmount, fromBalance, amount);
return(false);
}
BigInteger senderAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(from);
if (amount == 0 || from == to || fromBalance - senderAmountSubjectToVesting < amount)
{
// don't accept a meaningless value
Runtime.Log("TransferFrom() empty transfer amount or from==to");
transfer(from, to, amount);
return(true); // as per nep5 standard - return true when amount is 0 or from == to
}
if (!Runtime.CheckWitness(spender))
{
// ensure transaction is signed properly by the spender
Runtime.Log("TransferFrom() CheckWitness failed");
return(false);
}
BigInteger recipientBalance = BalanceOf(to);
BigInteger recipientAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(to);
BigInteger newBalance = fromBalance - amount;
Helpers.SetBalanceOf(from, newBalance + senderAmountSubjectToVesting); // remove balance from originating account
Helpers.SetBalanceOf(to, recipientBalance + recipientAmountSubjectToVesting + amount); // set new balance for destination account
Helpers.SetAllowanceAmount(from.Concat(spender), approvedTransferAmount - amount); // deduct transferred amount from allowance
transfer(from, to, amount);
return(true);
}
/// <summary>
/// NEP5: Transfer tokens from one account to another
/// </summary>
/// <param name="from">sender address</param>
/// <param name="to">recipient address</param>
/// <param name="amount">number of tokens to transfer</param>
/// <param name="caller"></param>
/// <param name="entry"></param>
/// <returns></returns>
public static bool Transfer(byte[] from, byte[] to, BigInteger amount, byte[] caller, byte[] entry)
{
if (caller != entry && !Helpers.IsContractWhitelistedDEX(caller))
{
from = caller;
}
if (from.Length != 20 || to.Length != 20)
{
Runtime.Log("Transfer() (from|to).Length != 20");
return(false);
}
if (amount < 0 || from == to)
{
Runtime.Log("Transfer() invalid transfer amount must be >= 0");
throw new Exception();
}
if (!Runtime.CheckWitness(from))
{
// ensure transaction is signed properly by the owner of the tokens
Runtime.Log("Transfer() CheckWitness failed");
return(false);
}
//At this point, vesting is complete for all but founders and project.
//Check if vesting applies and resolve.
BigInteger recipientAmountSubjectToVesting = 0;
BigInteger senderAmountSubjectToVesting = 0;
// reduce gas usage by only checking vesting criteria if the from address is a project or founders key
if (Helpers.IsProjectKey(from))
{
senderAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(from);
}
BigInteger fromBalance = BalanceOfRaw(from); // retrieve balance of originating account
if (fromBalance - senderAmountSubjectToVesting < amount)
{
Runtime.Log("Transfer() fromBalance < transferValue");
// don't transfer if funds not available
return(false);
}
BigInteger recipientBalance = BalanceOfRaw(to);
BigInteger newBalance = fromBalance - amount;
Helpers.SetBalanceOf(from, newBalance); // remove balance from originating account
Helpers.SetBalanceOf(to, recipientBalance + amount); // set new balance for destination account
transfer(from, to, amount);
return(true);
}
public static bool Transfer(byte[] from, byte[] to, BigInteger amount, byte[] caller, byte[] entry)
{
if (caller != entry && !Helpers.IsContractWhitelistedDEX(caller))
{
from = caller;
}
if (from.Length != 20 || to.Length != 20)
{
Runtime.Log("Transfer() (from|to).Length != 20");
return(false);
}
if (amount < 0)
{
Runtime.Log("Transfer() invalid transfer amount must be >= 0");
throw new Exception();
}
BigInteger fromBalance = BalanceOf(from); // retrieve balance of originating account
if (fromBalance < amount)
{
Runtime.Log("Transfer() fromBalance < transferValue");
// don't transfer if funds not available
return(false);
}
if (amount == 0 || from == to)
{
// don't accept a meaningless value
Runtime.Log("Transfer() empty transfer amount or from==to");
transfer(from, to, amount);
return(true); // as per nep5 standard - return true when amount is 0 or from == to
}
if (!Runtime.CheckWitness(from))
{
// ensure transaction is signed properly by the owner of the tokens
Runtime.Log("Transfer() CheckWitness failed");
return(false);
}
BigInteger recipientBalance = BalanceOf(to);
BigInteger recipientAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(to);
BigInteger senderAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(from);
BigInteger newBalance = fromBalance - amount;
Helpers.SetBalanceOf(from, newBalance + senderAmountSubjectToVesting); // remove balance from originating account
Helpers.SetBalanceOf(to, recipientBalance + recipientAmountSubjectToVesting + amount); // set new balance for destination account
transfer(from, to, amount);
return(true);
}
/// <summary>
/// MintTokensEth is called when a the ETH contribution listener server triggers an Ether receive event
/// </summary>
/// <returns></returns>
public static bool MintTokensEth(string ethAddress, byte[] neoAddress, ulong ethReceived)
{
object[] transactionData = Helpers.GetEthTransactionAndSaleData(ethReceived, ethAddress, neoAddress);
Transaction tx = (Transaction)transactionData[0];
byte[] sender = (byte[])transactionData[1];
byte[] receiver = (byte[])transactionData[2];
BigInteger whiteListGroupNumber = (BigInteger)transactionData[5];
BigInteger crowdsaleAvailableAmount = (BigInteger)transactionData[6];
BigInteger groupMaximumContribution = (BigInteger)transactionData[7];
BigInteger totalTokensPurchased = (BigInteger)transactionData[8] * NEP5.factor;
BigInteger totalContributionBalance = (BigInteger)transactionData[9];
if (!CanETHUserParticipateInSale(transactionData))
{
refundEth(ethAddress, ethReceived);
Runtime.Notify("MintTokensEth() CanUserParticipate failed", false);
return(false);
}
if (Helpers.GetBlockTimestamp() >= ICOTemplate.PublicSaleEndTime())
{
refundEth(ethAddress, ethReceived);
Runtime.Notify("MintTokensEth() failed. Token Sale is closed.", false);
return(false);
}
byte[] lastTransactionHash = Storage.Get(Storage.CurrentContext, StorageKeys.MintTokensEthLastTX());
if (lastTransactionHash == tx.Hash)
{
// ensure that minTokens doesnt process the same transaction more than once
Runtime.Notify("MintTokensEth() not processing duplicate tx.Hash", tx.Hash);
return(false);
}
BigInteger tokenTotalSupply = NEP5.TotalSupply();
Storage.Put(Storage.CurrentContext, StorageKeys.MintTokensEthLastTX(), tx.Hash);
Runtime.Notify("MintTokensEth() receivedETH", ethReceived);
BigInteger senderAmountSubjectToVesting = TokenSale.SubjectToVestingPeriod(sender);
BigInteger newTokenBalance = NEP5.BalanceOf(sender) + totalTokensPurchased + senderAmountSubjectToVesting;
Helpers.SetBalanceOf(sender, newTokenBalance);
Helpers.SetBalanceOfSaleContribution(sender, totalContributionBalance);
Helpers.SetTotalSupply(totalTokensPurchased);
transfer(null, sender, totalTokensPurchased);
return(true);
}
public static BigInteger BalanceOf(byte[] account)
{
if (account.Length != 20)
{
Runtime.Log("BalanceOf() invalid address supplied");
return(0);
}
StorageMap balances = Storage.CurrentContext.CreateMap(StorageKeys.BalancePrefix());
BigInteger amountSubjectToVesting = TokenSale.SubjectToVestingPeriod(account);
BigInteger userBalance = balances.Get(account).AsBigInteger() - amountSubjectToVesting;
if (userBalance < 0)
{
userBalance = 0;
}
return(userBalance.AsByteArray().Concat(new byte[] { }).AsBigInteger());
}