// 生成资产的唯一ID
private static BigInteger _createID(NftInfo info)
{
info.total_supply = info.total_supply + 1;
BigInteger ID = info.nftid * 10_000_000_000 + (BigInteger)7 * 1_000_000_000 + info.total_supply;
return(ID);
}
// 可以动态发行一个新的资产
private static bool Deploy(BigInteger anftid, BigInteger atype, BigInteger atotal_amount, BigInteger aprice)
{
if (!Runtime.CheckWitness(Owner))
{
return(false);
}
StorageMap nftinfo = Storage.CurrentContext.CreateMap(nameof(nftinfo));
byte[] ni = nftinfo.Get(anftid.AsByteArray());
if (ni != null && ni.Length != 0)
{
return(false);
}
NftInfo info = new NftInfo
{
nftid = anftid,
type = atype,
total_amount = atotal_amount,
price = aprice,
total_supply = 0,
canbuy = true
};
nftinfo.Put(anftid.AsByteArray(), Helper.Serialize(info));
return(true);
}
// 获取某资产的发行信息
public static NftInfo GetNftSupplyInfo(BigInteger anftid)
{
NftInfo info = null;
StorageMap nftinfo = Storage.CurrentContext.CreateMap(nameof(nftinfo));
byte[] ni = nftinfo.Get(anftid.AsByteArray());
if (ni != null && ni.Length != 0)
{
info = Helper.Deserialize(ni) as NftInfo;
}
return(info);
}
// 从官方购买资产
private static bool BuyOfficial(byte[] buyer, BigInteger anftid)
{
if (!Runtime.CheckWitness(buyer))
{
return(false);
}
NftInfo info = null;
StorageMap nftinfo = Storage.CurrentContext.CreateMap(nameof(nftinfo));
byte[] ni = nftinfo.Get(anftid.AsByteArray());
if (ni == null || ni.Length == 0)
{
return(false);
}
info = Helper.Deserialize(ni) as NftInfo;
if (info.total_supply == info.total_amount)
{
// 这里需要通知
NftBuyErr(buyer, anftid, 10002);
return(false);
}
// -----------使用nep5购买
if (Nep5transfer("transfer", new object[] { buyer, Owner, info.price }) == false)
{
NftBuyErr(buyer, anftid, 10001);
return(false);
}
//----------
BigInteger ID = _createID(info);
nftinfo.Put(anftid.AsByteArray(), Helper.Serialize(info));
_saveToAsset(buyer, ID);
Buyed(buyer, ID, info.nftid, info.type, info.price);
Transferred(Owner, buyer, ID);
return(true);
}