/// <summary>
/// Determines whether the specified account has witnessed the current transaction.
/// </summary>
/// <param name="hash">The hash of the account.</param>
/// <returns><see langword="true"/> if the account has witnessed the current transaction; otherwise, <see langword="false"/>.</returns>
protected internal bool CheckWitnessInternal(UInt160 hash)
{
if (hash.Equals(CallingScriptHash)) return true;
if (ScriptContainer is Transaction tx)
{
Signer[] signers;
OracleResponse response = tx.GetAttribute<OracleResponse>();
if (response is null)
{
signers = tx.Signers;
}
else
{
OracleRequest request = NativeContract.Oracle.GetRequest(Snapshot, response.Id);
signers = NativeContract.Ledger.GetTransaction(Snapshot, request.OriginalTxid).Signers;
}
Signer signer = signers.FirstOrDefault(p => p.Account.Equals(hash));
if (signer is null) return false;
if (signer.Scopes == WitnessScope.Global) return true;
if (signer.Scopes.HasFlag(WitnessScope.CalledByEntry))
{
if (CallingScriptHash == null || CallingScriptHash == EntryScriptHash)
return true;
}
if (signer.Scopes.HasFlag(WitnessScope.CustomContracts))
{
if (signer.AllowedContracts.Contains(CurrentScriptHash))
return true;
}
if (signer.Scopes.HasFlag(WitnessScope.CustomGroups))
{
// Check allow state callflag
ValidateCallFlags(CallFlags.ReadStates);
var contract = NativeContract.ContractManagement.GetContract(Snapshot, CallingScriptHash);
// check if current group is the required one
if (contract.Manifest.Groups.Select(p => p.PubKey).Intersect(signer.AllowedGroups).Any())
return true;
}
return false;
}
// Check allow state callflag
ValidateCallFlags(CallFlags.ReadStates);
// only for non-Transaction types (Block, etc)
var hashes_for_verifying = ScriptContainer.GetScriptHashesForVerifying(Snapshot);
return hashes_for_verifying.Contains(hash);
}
public void TestCreateOracleResponseTx()
{
var snapshot = Blockchain.Singleton.GetSnapshot();
var executionFactor = NativeContract.Policy.GetExecFeeFactor(snapshot);
Assert.AreEqual(executionFactor, (uint)30);
var feePerByte = NativeContract.Policy.GetFeePerByte(snapshot);
Assert.AreEqual(feePerByte, (uint)1000);
OracleRequest request = new OracleRequest
{
OriginalTxid = UInt256.Zero,
GasForResponse = 100000000 * 1,
Url = "https://127.0.0.1/test",
Filter = "",
CallbackContract = UInt160.Zero,
CallbackMethod = "callback",
UserData = System.Array.Empty <byte>()
};
byte Prefix_Transaction = 11;
snapshot.Add(NativeContract.Ledger.CreateStorageKey(Prefix_Transaction, request.OriginalTxid), new StorageItem(new TransactionState()
{
BlockIndex = 1,
Transaction = new Transaction()
{
ValidUntilBlock = 1
}
}));
OracleResponse response = new OracleResponse()
{
Id = 1, Code = OracleResponseCode.Success, Result = new byte[] { 0x00 }
};
ECPoint[] oracleNodes = new ECPoint[] { ECCurve.Secp256r1.G };
var tx = OracleService.CreateResponseTx(snapshot, request, response, oracleNodes);
Assert.AreEqual(167, tx.Size);
Assert.AreEqual(2216640, tx.NetworkFee);
Assert.AreEqual(97783360, tx.SystemFee);
// case (2) The size of attribute exceed the maximum limit
request.GasForResponse = 0_10000000;
response.Result = new byte[10250];
tx = OracleService.CreateResponseTx(snapshot, request, response, oracleNodes);
Assert.AreEqual(166, tx.Size);
Assert.AreEqual(OracleResponseCode.InsufficientFunds, response.Code);
Assert.AreEqual(2215640, tx.NetworkFee);
Assert.AreEqual(7784360, tx.SystemFee);
}
/// <summary>
/// Determines whether the specified account has witnessed the current transaction.
/// </summary>
/// <param name="hash">The hash of the account.</param>
/// <returns><see langword="true"/> if the account has witnessed the current transaction; otherwise, <see langword="false"/>.</returns>
protected internal bool CheckWitnessInternal(UInt160 hash)
{
if (hash.Equals(CallingScriptHash))
{
return(true);
}
if (ScriptContainer is Transaction tx)
{
Signer[] signers;
OracleResponse response = tx.GetAttribute <OracleResponse>();
if (response is null)
{
signers = tx.Signers;
}
else
{
OracleRequest request = NativeContract.Oracle.GetRequest(Snapshot, response.Id);
signers = NativeContract.Ledger.GetTransaction(Snapshot, request.OriginalTxid).Signers;
}
Signer signer = signers.FirstOrDefault(p => p.Account.Equals(hash));
if (signer is null)
{
return(false);
}
foreach (WitnessRule rule in signer.GetAllRules())
{
if (rule.Condition.Match(this))
{
return(rule.Action == WitnessRuleAction.Allow);
}
}
return(false);
}
// Check allow state callflag
ValidateCallFlags(CallFlags.ReadStates);
// only for non-Transaction types (Block, etc)
var hashes_for_verifying = ScriptContainer.GetScriptHashesForVerifying(Snapshot);
return(hashes_for_verifying.Contains(hash));
}
public override bool Verify(DataCache snapshot, Transaction tx)
{
if (tx.Signers.Any(p => p.Scopes != WitnessScope.None))
{
return(false);
}
if (!tx.Script.Span.SequenceEqual(FixedScript))
{
return(false);
}
OracleRequest request = NativeContract.Oracle.GetRequest(snapshot, Id);
if (request is null)
{
return(false);
}
if (tx.NetworkFee + tx.SystemFee != request.GasForResponse)
{
return(false);
}
UInt160 oracleAccount = Contract.GetBFTAddress(NativeContract.RoleManagement.GetDesignatedByRole(snapshot, Role.Oracle, NativeContract.Ledger.CurrentIndex(snapshot) + 1));
return(tx.Signers.Any(p => p.Account.Equals(oracleAccount)));
}
public override bool Verify(StoreView snapshot, Transaction tx)
{
if (tx.Signers.Any(p => p.Scopes != WitnessScope.None))
{
return(false);
}
if (!tx.Script.AsSpan().SequenceEqual(FixedScript))
{
return(false);
}
OracleRequest request = NativeContract.Oracle.GetRequest(snapshot, Id);
if (request is null)
{
return(false);
}
if (tx.NetworkFee + tx.SystemFee != request.GasForResponse)
{
return(false);
}
UInt160 oracleAccount = Blockchain.GetConsensusAddress(NativeContract.Designate.GetDesignatedByRole(snapshot, Role.Oracle));
return(tx.Signers.Any(p => p.Account.Equals(oracleAccount)));
}
protected internal bool CheckWitnessInternal(UInt160 hash)
{
if (hash.Equals(CallingScriptHash))
{
return(true);
}
if (ScriptContainer is Transaction tx)
{
Signer[] signers;
OracleResponse response = tx.GetAttribute <OracleResponse>();
if (response is null)
{
signers = tx.Signers;
}
else
{
OracleRequest request = NativeContract.Oracle.GetRequest(Snapshot, response.Id);
signers = Snapshot.GetTransaction(request.OriginalTxid).Signers;
}
Signer signer = signers.FirstOrDefault(p => p.Account.Equals(hash));
if (signer is null)
{
return(false);
}
if (signer.Scopes == WitnessScope.Global)
{
return(true);
}
if (signer.Scopes.HasFlag(WitnessScope.CalledByEntry))
{
if (CallingScriptHash == null || CallingScriptHash == EntryScriptHash)
{
return(true);
}
}
if (signer.Scopes.HasFlag(WitnessScope.CustomContracts))
{
if (signer.AllowedContracts.Contains(CurrentScriptHash))
{
return(true);
}
}
if (signer.Scopes.HasFlag(WitnessScope.CustomGroups))
{
// Check allow state callflag
if (!CurrentContext.GetState <ExecutionContextState>().CallFlags.HasFlag(CallFlags.ReadStates))
{
throw new InvalidOperationException($"Cannot call this SYSCALL without the flag AllowStates.");
}
var contract = NativeContract.Management.GetContract(Snapshot, CallingScriptHash);
// check if current group is the required one
if (contract.Manifest.Groups.Select(p => p.PubKey).Intersect(signer.AllowedGroups).Any())
{
return(true);
}
}
return(false);
}
// Check allow state callflag
if (!CurrentContext.GetState <ExecutionContextState>().CallFlags.HasFlag(CallFlags.ReadStates))
{
throw new InvalidOperationException($"Cannot call this SYSCALL without the flag AllowStates.");
}
// only for non-Transaction types (Block, etc)
var hashes_for_verifying = ScriptContainer.GetScriptHashesForVerifying(Snapshot);
return(hashes_for_verifying.Contains(hash));
}
// Copied from OracleService.CreateResponseTx to avoid taking dependency on OracleService package and it's 110mb GRPC runtime
public static Transaction?CreateResponseTx(DataCache snapshot, OracleRequest request, OracleResponse response, IReadOnlyList <ECPoint> oracleNodes, ProtocolSettings settings)
{
if (oracleNodes.Count == 0)
{
throw new Exception("No oracle nodes available. Have you enabled oracles via the `oracle enable` command?");
}
var requestTx = NativeContract.Ledger.GetTransactionState(snapshot, request.OriginalTxid);
var n = oracleNodes.Count;
var m = n - (n - 1) / 3;
var oracleSignContract = Contract.CreateMultiSigContract(m, oracleNodes);
var tx = new Transaction()
{
Version = 0,
Nonce = unchecked ((uint)response.Id),
ValidUntilBlock = requestTx.BlockIndex + settings.MaxValidUntilBlockIncrement,
Signers = new[]
{
new Signer
{
Account = NativeContract.Oracle.Hash,
Scopes = WitnessScope.None
},
new Signer
{
Account = oracleSignContract.ScriptHash,
Scopes = WitnessScope.None
}
},
Attributes = new[] { response },
Script = OracleResponse.FixedScript,
Witnesses = new Witness[2]
};
Dictionary <UInt160, Witness> witnessDict = new Dictionary <UInt160, Witness>
{
[oracleSignContract.ScriptHash] = new Witness
{
InvocationScript = Array.Empty <byte>(),
VerificationScript = oracleSignContract.Script,
},
[NativeContract.Oracle.Hash] = new Witness
{
InvocationScript = Array.Empty <byte>(),
VerificationScript = Array.Empty <byte>(),
}
};
UInt160[] hashes = tx.GetScriptHashesForVerifying(snapshot);
tx.Witnesses[0] = witnessDict[hashes[0]];
tx.Witnesses[1] = witnessDict[hashes[1]];
// Calculate network fee
var oracleContract = NativeContract.ContractManagement.GetContract(snapshot, NativeContract.Oracle.Hash);
var engine = ApplicationEngine.Create(TriggerType.Verification, tx, snapshot.CreateSnapshot(), settings: settings);
ContractMethodDescriptor md = oracleContract.Manifest.Abi.GetMethod("verify", -1);
engine.LoadContract(oracleContract, md, CallFlags.None);
if (engine.Execute() != Neo.VM.VMState.HALT)
{
return(null);
}
tx.NetworkFee += engine.GasConsumed;
var executionFactor = NativeContract.Policy.GetExecFeeFactor(snapshot);
var networkFee = executionFactor * Neo.SmartContract.Helper.MultiSignatureContractCost(m, n);
tx.NetworkFee += networkFee;
// Base size for transaction: includes const_header + signers + script + hashes + witnesses, except attributes
int size_inv = 66 * m;
int size = Transaction.HeaderSize + tx.Signers.GetVarSize() + tx.Script.GetVarSize()
+ Neo.IO.Helper.GetVarSize(hashes.Length) + witnessDict[NativeContract.Oracle.Hash].Size
+ Neo.IO.Helper.GetVarSize(size_inv) + size_inv + oracleSignContract.Script.GetVarSize();
var feePerByte = NativeContract.Policy.GetFeePerByte(snapshot);
if (response.Result.Length > OracleResponse.MaxResultSize)
{
response.Code = OracleResponseCode.ResponseTooLarge;
response.Result = Array.Empty <byte>();
}
else if (tx.NetworkFee + (size + tx.Attributes.GetVarSize()) * feePerByte > request.GasForResponse)
{
response.Code = OracleResponseCode.InsufficientFunds;
response.Result = Array.Empty <byte>();
}
size += tx.Attributes.GetVarSize();
tx.NetworkFee += size * feePerByte;
// Calculate system fee
tx.SystemFee = request.GasForResponse - tx.NetworkFee;
return(tx);
}