private bool API_Deploy(ExecutionEngine engine, NativeNEP5State state)
{
// 创世块里的全局资产不做检查
if (Snapshot.PersistingBlock.Index != 0)
{
// 检查管理员的签名
if (state.Admin.Equals(UInt160.Zero) || !Service.CheckWitness(engine, state.Admin))
{
return(false);
}
}
// 全局资产只在根链上做初始分配，暂时注释掉，等跨链兑换完成后再打开检查
//if (Snapshot.PersistingBlock.Index == 0 && !Snapshot.Blockchain.ChainHash.Equals(UInt160.Zero))
// return false;
byte[] total_supply = NativeAPI.StorageGet(Snapshot, state.AssetId, Encoding.ASCII.GetBytes("totalSupply"));
if (total_supply.Length != 0)
{
return(false);
}
// 创世块里的全局资产，使用创世块的共识多签地址作为初始地址
UInt160 scriptHash = Snapshot.PersistingBlock.Index == 0 ? Snapshot.PersistingBlock.NextConsensus : state.Admin;
var keyAdmin = new byte[] { 0x11 }.Concat(scriptHash.ToArray());
NativeAPI.StoragePut(Snapshot, state.AssetId, keyAdmin.ToArray(), state.TotalSupply);
NativeAPI.StoragePut(Snapshot, state.AssetId, Encoding.ASCII.GetBytes("totalSupply"), state.TotalSupply);
Service.AddTransferNotification(engine, state.AssetId, UInt160.Zero, state.Admin, state.TotalSupply);
return(true);
}
private bool API_MintToken(ExecutionEngine engine, NativeNEP5State state)
{
// 只有创建时总量设为0的货币才能调用发币接口
if (state.TotalSupply.GetData() != 0)
{
return(false);
}
// 检查管理员的签名
if (state.Admin.Equals(UInt160.Zero) || !Service.CheckWitness(engine, state.Admin))
{
return(false);
}
UInt160 address = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
Fixed8 amount = new Fixed8((long)engine.CurrentContext.EvaluationStack.Pop().GetBigInteger());
// 变更货币总量
BigInteger totalSupply = NativeAPI.StorageGet(Snapshot, state.AssetId, Encoding.ASCII.GetBytes("totalSupply")).AsBigInteger();
NativeAPI.StoragePut(Snapshot, state.AssetId, Encoding.ASCII.GetBytes("totalSupply"), totalSupply + amount.GetData());
// 发放货币
NativeAPI.AddBalance(Snapshot, state.AssetId, address, amount);
if (engine.ScriptContainer is Transaction tx)
{
NativeAPI.SaveTransferLog(Snapshot, state.AssetId, tx.Hash, UInt160.Zero, address, amount);
}
Service.AddTransferNotification(engine, state.AssetId, UInt160.Zero, address, amount);
return(true);
}
private bool API_TransferApp(ExecutionEngine engine, NativeNEP5State state)
{
UInt160 from = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
UInt160 to = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
Fixed8 value = new Fixed8((long)engine.CurrentContext.EvaluationStack.Pop().GetBigInteger());
if (from != new UInt160(engine.CurrentContext.ScriptHash))
{
return(false);
}
bool result = NativeAPI.Transfer(Snapshot, state.AssetId, from, to, value);
if (result)
{
if (engine.ScriptContainer is Transaction tx)
{
NativeAPI.SaveTransferLog(Snapshot, state.AssetId, tx.Hash, from, to, value);
}
Service.AddTransferNotification(engine, state.AssetId, from, to, value);
}
engine.CurrentContext.EvaluationStack.Push(result);
return(result);
}
private bool API_Approve(ExecutionEngine engine, NativeNEP5State state)
{
UInt160 from = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
UInt160 to = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
Fixed8 value = new Fixed8((long)engine.CurrentContext.EvaluationStack.Pop().GetBigInteger());
if (!Service.CheckWitness(engine, from))
{
return(false);
}
if (engine.EntryContext.ScriptHash != engine.CurrentContext.ScriptHash)
{
return(false);
}
bool result = NativeAPI.Approve(Snapshot, state.AssetId, from, to, value);
if (result)
{
Service.AddApproveNotification(engine, state.AssetId, from, to, value);
}
engine.CurrentContext.EvaluationStack.Push(result);
return(result);
}
private bool API_BalanceOf(ExecutionEngine engine, NativeNEP5State state)
{
UInt160 address = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
var key = new byte[] { 0x11 }.Concat(address.ToArray()).ToArray();
engine.CurrentContext.EvaluationStack.Push(NativeAPI.StorageGet(Snapshot, state.AssetId, key).AsBigInteger());
return(true);
}
private bool API_Allowance(ExecutionEngine engine, NativeNEP5State state)
{
UInt160 from = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
UInt160 spender = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
var keyApprove = from.ToArray().Concat(spender.ToArray()).ToArray();
engine.CurrentContext.EvaluationStack.Push(NativeAPI.StorageGet(Snapshot, state.AssetId, keyApprove).AsBigInteger());
return(true);
}
public bool GetTransferLog(ExecutionEngine engine)
{
UInt160 assetId = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
NativeNEP5State state = Snapshot.NativeNEP5s.TryGet(assetId);
if (state == null)
{
return(false);
}
return(API_GetTransferLog(engine, state));
}
private bool API_GetTransferLog(ExecutionEngine engine, NativeNEP5State state)
{
byte[] hash = engine.CurrentContext.EvaluationStack.Pop().GetByteArray();
TransferLog transferLog = NativeAPI.GetTransferLog(Snapshot, state.AssetId, hash);
if (transferLog == null)
{
return(false);
}
engine.CurrentContext.EvaluationStack.Push(StackItem.FromInterface(transferLog));
return(true);
}
public bool Create(ExecutionEngine engine)
{
if (Trigger != TriggerType.Application)
{
return(false);
}
// 全名
if (engine.CurrentContext.EvaluationStack.Peek().GetByteArray().Length > 1024)
{
return(false);
}
string name = Encoding.UTF8.GetString(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
// 简写名
if (engine.CurrentContext.EvaluationStack.Peek().GetByteArray().Length > 252)
{
return(false);
}
string symbol = Encoding.UTF8.GetString(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
// 货币总量
Fixed8 amount = new Fixed8((long)engine.CurrentContext.EvaluationStack.Pop().GetBigInteger());
if (amount < Fixed8.Zero)
{
return(false);
}
// 货币精度
byte precision = (byte)engine.CurrentContext.EvaluationStack.Pop().GetBigInteger();
if (precision > 8)
{
return(false);
}
if (amount.GetData() % (long)Math.Pow(10, precision) != 0)
{
return(false);
}
// 发行人
ECPoint owner = ECPoint.DecodePoint(engine.CurrentContext.EvaluationStack.Pop().GetByteArray(), ECCurve.Secp256r1);
// 创世块不做检查
if (Snapshot.PersistingBlock.Index != 0)
{
// 检查发行人的签名
if (owner.IsInfinity)
{
return(false);
}
if (!Service.CheckWitness(engine, owner))
{
return(false);
}
}
// 管理员
UInt160 admin = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
// 创世块不做检查
if (Snapshot.PersistingBlock.Index != 0)
{
// 检查管理员的Hash
if (admin.Equals(UInt160.Zero))
{
return(false);
}
}
UInt160 assetId;
if (Snapshot.PersistingBlock.Index == 0)
{
// 只有在创世块里可以自定义assetId
assetId = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
}
else
{
// 用ScriptHash作为assetId
assetId = new UInt160(engine.CurrentContext.ScriptHash);
}
NativeNEP5State state = Snapshot.NativeNEP5s.TryGet(assetId);
if (state == null)
{
state = new NativeNEP5State
{
AssetId = assetId,
Name = name,
Symbol = symbol,
TotalSupply = amount,
Decimals = precision,
Owner = owner,
Admin = admin,
BlockIndex = Snapshot.Height + 1,
IsFrozen = false
};
// 保存到数据库
Snapshot.NativeNEP5s.Add(assetId, state);
}
// 设置脚本的返回值
engine.CurrentContext.EvaluationStack.Push(StackItem.FromInterface(state));
return(true);
}
private bool API_Decimals(ExecutionEngine engine, NativeNEP5State state)
{
engine.CurrentContext.EvaluationStack.Push((int)state.Decimals);
return(true);
}
private bool API_TotalSupply(ExecutionEngine engine, NativeNEP5State state)
{
engine.CurrentContext.EvaluationStack.Push(NativeAPI.StorageGet(Snapshot, state.AssetId, Encoding.ASCII.GetBytes("totalSupply")).AsBigInteger());
return(true);
}
private bool API_Symbol(ExecutionEngine engine, NativeNEP5State state)
{
engine.CurrentContext.EvaluationStack.Push(state.Symbol);
return(true);
}
public bool Call(ExecutionEngine engine)
{
if (Trigger != TriggerType.Application)
{
return(false);
}
if (engine.CurrentContext.EvaluationStack.Peek().GetByteArray().Length > 252)
{
return(false);
}
string method = Encoding.UTF8.GetString(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
// 兼容用json数组来打包的参数
StackItem stackItem = engine.CurrentContext.EvaluationStack.Peek();
if (stackItem is Neo.VM.Types.Array array)
{
engine.CurrentContext.EvaluationStack.Pop();
int count = array.Count();
for (int i = count - 1; i >= 0; i--)
{
engine.CurrentContext.EvaluationStack.Push(array[i]);
}
}
UInt160 assetId = new UInt160(engine.CurrentContext.EvaluationStack.Pop().GetByteArray());
NativeNEP5State state = Snapshot.NativeNEP5s.TryGet(assetId);
if (state == null)
{
return(false);
}
switch (method)
{
case "Name":
return(API_Name(engine, state));
case "Symbol":
return(API_Symbol(engine, state));
case "TotalSupply":
return(API_TotalSupply(engine, state));
case "Decimals":
return(API_Decimals(engine, state));
case "BalanceOf":
return(API_BalanceOf(engine, state));
case "Transfer":
return(API_Transfer(engine, state));
case "TransferApp":
return(API_TransferApp(engine, state));
case "Approve":
return(API_Approve(engine, state));
case "TransferFrom":
return(API_TransferFrom(engine, state));
case "Allowance":
return(API_Allowance(engine, state));
case "GetTransferLog":
return(API_GetTransferLog(engine, state));
case "Deploy":
return(API_Deploy(engine, state));
case "MintToken":
return(API_MintToken(engine, state));
}
return(false);
}