public static UInt160 OwnerOf(ByteString tokenId)
{
StorageMap nameMap = new(Storage.CurrentContext, Prefix_Name);
NameState token = (NameState)StdLib.Deserialize(nameMap[GetKey(tokenId)]);
token.EnsureNotExpired();
return(token.Owner);
}
public static Map <string, object> Properties(ByteString tokenId)
{
StorageMap nameMap = new(Storage.CurrentContext, Prefix_Name);
NameState token = (NameState)StdLib.Deserialize(nameMap[GetKey(tokenId)]);
token.EnsureNotExpired();
Map <string, object> map = new();
map["name"] = token.Name;
map["expiration"] = token.Expiration;
return(map);
}
public static bool Transfer(UInt160 to, ByteString tokenId, object data)
{
if (to is null || !to.IsValid)
{
throw new Exception("The argument \"to\" is invalid.");
}
StorageContext context = Storage.CurrentContext;
StorageMap balanceMap = new(context, Prefix_Balance);
StorageMap accountMap = new(context, Prefix_AccountToken);
StorageMap nameMap = new(context, Prefix_Name);
ByteString tokenKey = GetKey(tokenId);
NameState token = (NameState)StdLib.Deserialize(nameMap[tokenKey]);
token.EnsureNotExpired();
UInt160 from = token.Owner;
if (!Runtime.CheckWitness(from))
{
return(false);
}
if (from != to)
{
//Update token info
token.Owner = to;
token.Admin = null;
nameMap[tokenKey] = StdLib.Serialize(token);
//Update from account
BigInteger balance = (BigInteger)balanceMap[from];
balance--;
if (balance.IsZero)
{
balanceMap.Delete(from);
}
else
{
balanceMap.Put(from, balance);
}
accountMap.Delete(from + tokenKey);
//Update to account
balance = (BigInteger)balanceMap[to];
balance++;
balanceMap.Put(to, balance);
accountMap[to + tokenKey] = tokenId;
}
PostTransfer(from, to, tokenId, data);
return(true);
}