private ContractState Deploy(ApplicationEngine engine, byte[] nefFile, byte[] manifest, StackItem data)
{
if (engine.ScriptContainer is not Transaction tx)
{
throw new InvalidOperationException();
}
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
if (manifest.Length == 0 || manifest.Length > ContractManifest.MaxLength)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
engine.AddGas(Math.Max(
engine.StoragePrice * (nefFile.Length + manifest.Length),
GetMinimumDeploymentFee(engine.Snapshot)
));
NefFile nef = nefFile.AsSerializable <NefFile>();
ContractManifest parsedManifest = ContractManifest.Parse(manifest);
UInt160 hash = Helper.GetContractHash(tx.Sender, nef.CheckSum, parsedManifest.Name);
StorageKey key = CreateStorageKey(Prefix_Contract).Add(hash);
if (engine.Snapshot.Contains(key))
{
throw new InvalidOperationException($"Contract Already Exists: {hash}");
}
ContractState contract = new ContractState
{
Id = GetNextAvailableId(engine.Snapshot),
UpdateCounter = 0,
Nef = nef,
Hash = hash,
Manifest = parsedManifest
};
if (!contract.Manifest.IsValid(hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {hash}");
}
engine.Snapshot.Add(key, new StorageItem(contract));
// Execute _deploy
ContractMethodDescriptor md = contract.Manifest.Abi.GetMethod("_deploy", 2);
if (md != null)
{
engine.CallFromNativeContract(Hash, hash, md.Name, data, false);
}
engine.SendNotification(Hash, "Deploy", new VM.Types.Array {
contract.Hash.ToArray()
});
return(contract);
}
internal bool Invoke(ApplicationEngine engine)
{
if (!engine.CurrentScriptHash.Equals(Hash))
{
return(false);
}
string operation = engine.CurrentContext.EvaluationStack.Pop().GetString();
Array args = (Array)engine.CurrentContext.EvaluationStack.Pop();
if (!methods.TryGetValue(operation, out ContractMethodMetadata method))
{
return(false);
}
ExecutionContextState state = engine.CurrentContext.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
return(false);
}
if (!engine.AddGas(method.Price))
{
return(false);
}
StackItem result = method.Delegate(engine, args);
engine.CurrentContext.EvaluationStack.Push(result);
return(true);
}
private void Update(ApplicationEngine engine, byte[] nefFile, byte[] manifest, StackItem data)
{
if (nefFile is null && manifest is null)
{
throw new ArgumentException();
}
engine.AddGas(engine.StoragePrice * ((nefFile?.Length ?? 0) + (manifest?.Length ?? 0)));
var contract = engine.Snapshot.GetAndChange(CreateStorageKey(Prefix_Contract).Add(engine.CallingScriptHash))?.GetInteroperable <ContractState>();
if (contract is null)
{
throw new InvalidOperationException($"Updating Contract Does Not Exist: {engine.CallingScriptHash}");
}
if (nefFile != null)
{
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
// Update nef
contract.Nef = nefFile.AsSerializable <NefFile>();
}
if (manifest != null)
{
if (manifest.Length == 0)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
ContractManifest manifest_new = ContractManifest.Parse(manifest);
if (manifest_new.Name != contract.Manifest.Name)
{
throw new InvalidOperationException("The name of the contract can't be changed.");
}
if (!manifest_new.IsValid(contract.Hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {contract.Hash}");
}
contract.Manifest = manifest_new;
}
Check(contract.Nef.Script, contract.Manifest.Abi);
contract.UpdateCounter++; // Increase update counter
if (nefFile != null)
{
ContractMethodDescriptor md = contract.Manifest.Abi.GetMethod("_deploy", 2);
if (md != null)
{
engine.CallFromNativeContract(Hash, contract.Hash, md.Name, data, true);
}
}
engine.SendNotification(Hash, "Update", new VM.Types.Array {
contract.Hash.ToArray()
});
}
private async ContractTask <ContractState> Deploy(ApplicationEngine engine, byte[] nefFile, byte[] manifest, StackItem data)
{
if (engine.ScriptContainer is not Transaction tx)
{
throw new InvalidOperationException();
}
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
if (manifest.Length == 0)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
engine.AddGas(Math.Max(
engine.StoragePrice * (nefFile.Length + manifest.Length),
GetMinimumDeploymentFee(engine.Snapshot)
));
NefFile nef = nefFile.AsSerializable <NefFile>();
ContractManifest parsedManifest = ContractManifest.Parse(manifest);
Helper.Check(nef.Script, parsedManifest.Abi);
UInt160 hash = Helper.GetContractHash(tx.Sender, nef.CheckSum, parsedManifest.Name);
if (Policy.IsBlocked(engine.Snapshot, hash))
{
throw new InvalidOperationException($"The contract {hash} has been blocked.");
}
StorageKey key = CreateStorageKey(Prefix_Contract).Add(hash);
if (engine.Snapshot.Contains(key))
{
throw new InvalidOperationException($"Contract Already Exists: {hash}");
}
ContractState contract = new()
{
Id = GetNextAvailableId(engine.Snapshot),
UpdateCounter = 0,
Nef = nef,
Hash = hash,
Manifest = parsedManifest
};
if (!contract.Manifest.IsValid(hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {hash}");
}
engine.Snapshot.Add(key, new StorageItem(contract));
await OnDeploy(engine, contract, data, false);
return(contract);
}
private ContractState Deploy(ApplicationEngine engine, byte[] nefFile, byte[] manifest)
{
if (!(engine.ScriptContainer is Transaction tx))
{
throw new InvalidOperationException();
}
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
if (manifest.Length == 0 || manifest.Length > ContractManifest.MaxLength)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
engine.AddGas(engine.StoragePrice * (nefFile.Length + manifest.Length));
NefFile nef = nefFile.AsSerializable <NefFile>();
UInt160 hash = Helper.GetContractHash(tx.Sender, nef.Script);
StorageKey key = CreateStorageKey(Prefix_Contract).Add(hash);
if (engine.Snapshot.Storages.Contains(key))
{
throw new InvalidOperationException($"Contract Already Exists: {hash}");
}
ContractState contract = new ContractState
{
Id = GetNextAvailableId(engine.Snapshot),
UpdateCounter = 0,
Script = nef.Script,
Hash = hash,
Manifest = ContractManifest.Parse(manifest)
};
if (!contract.Manifest.IsValid(hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {hash}");
}
engine.Snapshot.Storages.Add(key, new StorageItem(contract));
// Execute _deploy
ContractMethodDescriptor md = contract.Manifest.Abi.GetMethod("_deploy");
if (md != null)
{
engine.CallFromNativeContract(Hash, hash, md.Name, false);
}
return(contract);
}
internal bool Invoke(ApplicationEngine engine)
{
if (!engine.CurrentScriptHash.Equals(Hash))
{
return(false);
}
if (!engine.TryPop(out string operation))
{
return(false);
}
if (!engine.TryPop(out Array args))
{
return(false);
}
if (!methods.TryGetValue(operation, out ContractMethodMetadata method))
{
return(false);
}
ExecutionContextState state = engine.CurrentContext.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
return(false);
}
if (!engine.AddGas(method.Price))
{
return(false);
}
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
StackItem item = i < args.Count ? args[i] : StackItem.Null;
parameters.Add(engine.Convert(item, method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
engine.Push(engine.Convert(returnValue));
}
return(true);
}
private ContractTask Update(ApplicationEngine engine, byte[] nefFile, byte[] manifest, StackItem data)
{
if (nefFile is null && manifest is null)
{
throw new ArgumentException();
}
engine.AddGas(engine.StoragePrice * ((nefFile?.Length ?? 0) + (manifest?.Length ?? 0)));
var contract = engine.Snapshot.GetAndChange(CreateStorageKey(Prefix_Contract).Add(engine.CallingScriptHash))?.GetInteroperable <ContractState>();
if (contract is null)
{
throw new InvalidOperationException($"Updating Contract Does Not Exist: {engine.CallingScriptHash}");
}
if (contract.UpdateCounter == ushort.MaxValue)
{
throw new InvalidOperationException($"The contract reached the maximum number of updates.");
}
if (nefFile != null)
{
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
// Update nef
contract.Nef = nefFile.AsSerializable <NefFile>();
}
if (manifest != null)
{
if (manifest.Length == 0)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
ContractManifest manifest_new = ContractManifest.Parse(manifest);
if (manifest_new.Name != contract.Manifest.Name)
{
throw new InvalidOperationException("The name of the contract can't be changed.");
}
if (!manifest_new.IsValid(contract.Hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {contract.Hash}");
}
contract.Manifest = manifest_new;
}
Helper.Check(contract.Nef.Script, contract.Manifest.Abi);
contract.UpdateCounter++; // Increase update counter
return(OnDeploy(engine, contract, data, true));
}
private bool RegisterCandidate(ApplicationEngine engine, ECPoint pubkey)
{
if (!engine.CheckWitnessInternal(Contract.CreateSignatureRedeemScript(pubkey).ToScriptHash()))
{
return(false);
}
engine.AddGas(GetRegisterPrice(engine.Snapshot));
StorageKey key = CreateStorageKey(Prefix_Candidate).Add(pubkey);
StorageItem item = engine.Snapshot.GetAndChange(key, () => new StorageItem(new CandidateState()));
CandidateState state = item.GetInteroperable <CandidateState>();
state.Registered = true;
return(true);
}
private void Update(ApplicationEngine engine, byte[] nefFile, byte[] manifest)
{
if (nefFile is null && manifest is null)
{
throw new ArgumentException();
}
engine.AddGas(engine.StoragePrice * ((nefFile?.Length ?? 0) + (manifest?.Length ?? 0)));
var contract = engine.Snapshot.Storages.GetAndChange(CreateStorageKey(Prefix_Contract).Add(engine.CallingScriptHash))?.GetInteroperable <ContractState>();
if (contract is null)
{
throw new InvalidOperationException($"Updating Contract Does Not Exist: {engine.CallingScriptHash}");
}
if (nefFile != null)
{
if (nefFile.Length == 0)
{
throw new ArgumentException($"Invalid NefFile Length: {nefFile.Length}");
}
NefFile nef = nefFile.AsSerializable <NefFile>();
// Update script
contract.Script = nef.Script;
}
if (manifest != null)
{
if (manifest.Length == 0 || manifest.Length > ContractManifest.MaxLength)
{
throw new ArgumentException($"Invalid Manifest Length: {manifest.Length}");
}
contract.Manifest = ContractManifest.Parse(manifest);
if (!contract.Manifest.IsValid(contract.Hash))
{
throw new InvalidOperationException($"Invalid Manifest Hash: {contract.Hash}");
}
}
contract.UpdateCounter++; // Increase update counter
if (nefFile != null)
{
ContractMethodDescriptor md = contract.Manifest.Abi.GetMethod("_deploy");
if (md != null)
{
engine.CallFromNativeContract(Hash, contract.Hash, md.Name, true);
}
}
}
internal async void Invoke(ApplicationEngine engine, byte version)
{
try
{
if (version != 0)
{
throw new InvalidOperationException($"The native contract of version {version} is not active.");
}
ExecutionContext context = engine.CurrentContext;
ContractMethodMetadata method = methods[context.InstructionPointer];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.CpuFee * Policy.GetExecFeeFactor(engine.Snapshot) + method.StorageFee * Policy.GetStoragePrice(engine.Snapshot));
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
parameters.Add(engine.Convert(context.EvaluationStack.Pop(), method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (returnValue is ContractTask task)
{
await task;
returnValue = task.GetResult();
}
if (method.Handler.ReturnType != typeof(void) && method.Handler.ReturnType != typeof(ContractTask))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}
catch (Exception ex)
{
engine.Throw(ex);
}
}
private uint Renew(ApplicationEngine engine, string name)
{
if (!nameRegex.IsMatch(name))
{
throw new ArgumentException(null, nameof(name));
}
string[] names = name.Split('.');
if (names.Length != 2)
{
throw new ArgumentException(null, nameof(name));
}
engine.AddGas(GetPrice(engine.Snapshot));
byte[] hash = GetKey(Utility.StrictUTF8.GetBytes(name));
NameState state = engine.Snapshot.GetAndChange(CreateStorageKey(Prefix_Token).Add(hash)).GetInteroperable <NameState>();
engine.Snapshot.Delete(CreateStorageKey(Prefix_Expiration).AddBigEndian(state.Expiration).Add(hash));
state.Expiration += OneYear;
engine.Snapshot.Add(CreateStorageKey(Prefix_Expiration).AddBigEndian(state.Expiration).Add(hash), new StorageItem(new byte[] { 0 }));
return(state.Expiration);
}
internal void Invoke(ApplicationEngine engine, byte version)
{
if (ActiveBlockIndex > Ledger.CurrentIndex(engine.Snapshot))
{
throw new InvalidOperationException($"The native contract {Name} is not active.");
}
if (version != 0)
{
throw new InvalidOperationException($"The native contract of version {version} is not active.");
}
ExecutionContext context = engine.CurrentContext;
ContractMethodMetadata method = methods[context.InstructionPointer];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.Price);
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
parameters.Add(engine.Convert(context.EvaluationStack.Pop(), method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}
private bool Register(ApplicationEngine engine, string name, UInt160 owner)
{
if (!nameRegex.IsMatch(name))
{
throw new ArgumentException(null, nameof(name));
}
string[] names = name.Split('.');
if (names.Length != 2)
{
throw new ArgumentException(null, nameof(name));
}
if (!engine.CheckWitnessInternal(owner))
{
throw new InvalidOperationException();
}
byte[] hash = GetKey(Utility.StrictUTF8.GetBytes(name));
if (engine.Snapshot.TryGet(CreateStorageKey(Prefix_Token).Add(hash)) is not null)
{
return(false);
}
StringList roots = engine.Snapshot[CreateStorageKey(Prefix_Roots)].GetInteroperable <StringList>();
if (roots.BinarySearch(names[1]) < 0)
{
throw new InvalidOperationException();
}
engine.AddGas(GetPrice(engine.Snapshot));
NameState state = new NameState
{
Owner = owner,
Name = name,
Description = "",
Expiration = (uint)(engine.PersistingBlock.Timestamp / 1000) + OneYear
};
Mint(engine, state);
engine.Snapshot.Add(CreateStorageKey(Prefix_Expiration).AddBigEndian(state.Expiration).Add(hash), new StorageItem(new byte[] { 0 }));
return(true);
}
internal void Invoke(ApplicationEngine engine)
{
if (!engine.CurrentScriptHash.Equals(Hash))
{
throw new InvalidOperationException("It is not allowed to use Neo.Native.Call directly to call native contracts. System.Contract.Call should be used.");
}
ExecutionContext context = engine.CurrentContext;
string operation = context.EvaluationStack.Pop().GetString();
Array args = context.EvaluationStack.Pop <Array>();
ContractMethodMetadata method = methods[operation];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.Price);
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
StackItem item = i < args.Count ? args[i] : StackItem.Null;
parameters.Add(engine.Convert(item, method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}