func extractTxID(txEnvelopBytes []byte) (string, error) {
txEnvelope, err := utils.GetEnvelope(txEnvelopBytes)
if err != nil {
return "", err
}
txPayload, err := utils.GetPayload(txEnvelope)
if err != nil {
return "", nil
}
return txPayload.Header.ChainHeader.TxID, nil
}
func extractTransaction(txEnvelopeBytes []byte) (*pb.Transaction, error) {
var err error
var txEnvelope *common.Envelope
var txPayload *common.Payload
var tx *pb.Transaction
if txEnvelope, err = putil.GetEnvelope(txEnvelopeBytes); err != nil {
return nil, err
}
if txPayload, err = putil.GetPayload(txEnvelope); err != nil {
return nil, err
}
if tx, err = putil.GetTransaction(txPayload.Data); err != nil {
return nil, err
}
return tx, nil
}
// Invoke is called to validate the specified block of transactions
// This validation system chaincode will check the read-write set validity and at least 1
// correct endorsement. Later we can create more validation system
// chaincodes to provide more sophisticated policy processing such as enabling
// policy specification to be coded as a transaction of the chaincode and the client
// selecting which policy to use for validation using parameter function
// @return serialized Block of valid and invalid transactions indentified
// Note that Peer calls this function with 2 arguments, where args[0] is the
// function name and args[1] is the Envelope
func (vscc *ValidatorOneValidSignature) Invoke(stub shim.ChaincodeStubInterface) ([]byte, error) {
// args[0] - function name (not used now)
// args[1] - serialized Envelope
args := stub.GetArgs()
if len(args) < 2 {
return nil, errors.New("Incorrect number of arguments")
}
if args[1] == nil {
return nil, errors.New("No block to validate")
}
logger.Infof("VSCC invoked")
// get the envelope...
env, err := utils.GetEnvelope(args[1])
if err != nil {
logger.Errorf("VSCC error: GetEnvelope failed, err %s", err)
return nil, err
}
// ...and the payload...
payl, err := utils.GetPayload(env)
if err != nil {
logger.Errorf("VSCC error: GetPayload failed, err %s", err)
return nil, err
}
// validate the payload type
if common.HeaderType(payl.Header.ChainHeader.Type) != common.HeaderType_ENDORSER_TRANSACTION {
logger.Errorf("Only Endorser Transactions are supported, provided type %d", payl.Header.ChainHeader.Type)
return nil, fmt.Errorf("Only Endorser Transactions are supported, provided type %d", payl.Header.ChainHeader.Type)
}
// ...and the transaction...
tx, err := utils.GetTransaction(payl.Data)
if err != nil {
logger.Errorf("VSCC error: GetTransaction failed, err %s", err)
return nil, err
}
// loop through each of the actions within
for _, act := range tx.Actions {
cap, err := utils.GetChaincodeActionPayload(act.Payload)
if err != nil {
logger.Errorf("VSCC error: GetChaincodeActionPayload failed, err %s", err)
return nil, err
}
// this is what is being signed
prespBytes := cap.Action.ProposalResponsePayload
// loop through each of the endorsements
for _, endorsement := range cap.Action.Endorsements {
// extract the identity of the signer
end, err := mspmgmt.GetManagerForChain(payl.Header.ChainHeader.ChainID).DeserializeIdentity(endorsement.Endorser)
if err != nil {
logger.Errorf("VSCC error: DeserializeIdentity failed, err %s", err)
return nil, err
}
// validate it
err = end.Validate()
if err != nil {
return nil, fmt.Errorf("Invalid endorser identity, err %s", err)
}
// verify the signature
err = end.Verify(append(prespBytes, endorsement.Endorser...), endorsement.Signature)
if err != nil {
return nil, fmt.Errorf("Invalid signature, err %s", err)
}
}
}
logger.Infof("VSCC exists successfully")
return nil, nil
}