/// <summary>
/// Because Profit Contract Addresses in different chains are different,
/// so we use a property (is_profitable) in TokenInfo in order to indicate whether
/// Profit Contract Address of current chain should be in the white list or not.
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
private bool IsContributingProfits(TransferFromInput input)
{
var tokenInfo = Context.Call <TokenInfo>(Context.Self, nameof(GetTokenInfo), new GetTokenInfoInput
{
Symbol = input.Symbol
}.ToByteString());
if (!tokenInfo.IsProfitable)
{
return(false);
}
if (Context.Sender == Context.GetContractAddressByName(SmartContractConstants.ProfitContractSystemName) ||
Context.Sender ==
Context.GetContractAddressByName(SmartContractConstants.TreasuryContractSystemName) // For main chain.
)
{
// Sender is Profit Contract, wants to transfer tokens from general ledger virtual address
// to period virtual address or sub schemes.
return(true);
}
var tokenHolderContractAddress =
Context.GetContractAddressByName(SmartContractConstants.TokenHolderContractSystemName);
if (Context.Sender == tokenHolderContractAddress && input.To == tokenHolderContractAddress)
{
// Sender is Token Holder Contract, wants to transfer tokens from DApp Contract to himself.
return(true);
}
return(false);
}
public override Empty TransferFrom(TransferFromInput input)
{
AssertValidToken(input.Symbol, input.Amount);
// First check allowance.
var allowance = State.Allowances[input.From][Context.Sender][input.Symbol];
if (allowance < input.Amount)
{
if (IsInWhiteList(new IsInWhiteListInput {
Symbol = input.Symbol, Address = Context.Sender
}).Value ||
IsContributingProfits(input))
{
DoTransfer(input.From, input.To, input.Symbol, input.Amount, input.Memo);
return(new Empty());
}
Assert(false,
$"[TransferFrom]Insufficient allowance. Token: {input.Symbol}; {allowance}/{input.Amount}.\n" +
$"From:{input.From}\tSpender:{Context.Sender}\tTo:{input.To}");
}
DoTransfer(input.From, input.To, input.Symbol, input.Amount, input.Memo);
State.Allowances[input.From][Context.Sender][input.Symbol] = allowance.Sub(input.Amount);
return(new Empty());
}
public override Empty TransferFrom(TransferFromInput input)
{
AssertValidToken(input.Symbol, input.Amount);
// First check allowance.
var allowance = State.Allowances[input.From][Context.Sender][input.Symbol];
if (allowance < input.Amount)
{
if (IsInWhiteList(new IsInWhiteListInput {
Symbol = input.Symbol, Address = Context.Sender
}).Value)
{
DoTransfer(input.From, input.To, input.Symbol, input.Amount, input.Memo);
return(new Empty());
}
Assert(false, "Insufficient allowance.");
}
DoTransfer(input.From, input.To, input.Symbol, input.Amount, input.Memo);
State.Allowances[input.From][Context.Sender][input.Symbol] = allowance.Sub(input.Amount);
return(new Empty());
}
private void TransferFrom(TransferFromInput input)
{
SetContractStateRequired(State.TokenContract, SmartContractConstants.TokenContractSystemName);
State.TokenContract.TransferFrom.Send(input);
}
private void TransferFrom(TransferFromInput input)
{
ValidateContractState(State.TokenContract, State.TokenContractSystemName.Value);
State.TokenContract.TransferFrom.Send(input);
}
private void TransferFrom(TransferFromInput input)
{
ValidateContractState(State.TokenContract, SmartContractConstants.TokenContractSystemName);
State.TokenContract.TransferFrom.Send(input);
}
