public static bool TryGetRequiredValidations(ILedgerState state, TransactionRequiredValidationFactory factory, Transaction transaction, out List <TransactionRequiredValidation> validations)
{
var dictionary = new Dictionary <Address, TransactionRequiredValidation>();
foreach (var input in transaction.GetInputs())
{
var address = input.Address;
if (!dictionary.ContainsKey(address))
{
TransactionRequiredValidation validation;
if (!factory.TryGetRequiredValidations(state, input.Address, transaction.Declarations, out validation))
{
validations = new List <TransactionRequiredValidation>();
return(false);
}
dictionary.Add(address, validation);
}
}
validations = dictionary.Values.ToList();
return(true);
}
private static bool TryGetRequiredSignatures(ILedgerState state, TransactionRequiredValidationFactory factory, Transaction transaction, out List <TransactionRequiredValidation> list)
{
var validations = new Dictionary <string, TransactionRequiredValidation>();
foreach (var input in transaction.GetInputs())
{
if (!validations.ContainsKey(input.Address.Encoded))
{
TransactionRequiredValidation required;
if (!factory.TryGetRequiredValidations(state, input.Address, transaction.Declarations, out required))
{
list = null;
return(false);
}
validations.Add(input.Address.Encoded, required);
}
}
list = validations.Values.ToList();
return(true);
}
public static bool CheckSignatures(this SignedTransaction transaction, TransactionRequiredValidationFactory factory, Network network, long timestamp, ILedgerState state = null)
{
var hash = transaction.Hash;
// get required signatures
List <TransactionRequiredValidation> requireds;
if (!TryGetRequiredValidations(state, factory, transaction.Transaction, out requireds))
{
return(false);
}
var signatures = transaction.Signatures.Select(signature => new SignatureRequired(signature)).ToList();
// check required signatures and declarations are set
foreach (var required in requireds)
{
if (!required.IsValid(signatures, transaction.Transaction, timestamp))
{
return(false);
}
}
// TODO we dont accept transactions with useless declarations
// we try to optimize by checking signatures only at the end
// verify signatures
foreach (var signature in signatures)
{
// we dont accept transactions with useless signatures
if (!signature.Required || !signature.Verify(hash, network))
{
return(false);
}
}
return(true);
}
