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txutils.go
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txutils.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package utils
import (
"errors"
"fmt"
"bytes"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/bccsp"
"github.com/hyperledger/fabric/bccsp/factory"
"github.com/hyperledger/fabric/common/crypto"
"github.com/hyperledger/fabric/msp"
"github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protos/peer"
)
// GetPayloads get's the underlying payload objects in a TransactionAction
func GetPayloads(txActions *peer.TransactionAction) (*peer.ChaincodeActionPayload, *peer.ChaincodeAction, error) {
// TODO: pass in the tx type (in what follows we're assuming the type is ENDORSER_TRANSACTION)
ccPayload := &peer.ChaincodeActionPayload{}
err := proto.Unmarshal(txActions.Payload, ccPayload)
if err != nil {
return nil, nil, err
}
if ccPayload.Action == nil || ccPayload.Action.ProposalResponsePayload == nil {
return nil, nil, fmt.Errorf("no payload in ChaincodeActionPayload")
}
pRespPayload := &peer.ProposalResponsePayload{}
err = proto.Unmarshal(ccPayload.Action.ProposalResponsePayload, pRespPayload)
if err != nil {
return nil, nil, err
}
if pRespPayload.Extension == nil {
return nil, nil, fmt.Errorf("response payload is missing extension")
}
respPayload := &peer.ChaincodeAction{}
err = proto.Unmarshal(pRespPayload.Extension, respPayload)
if err != nil {
return ccPayload, nil, err
}
return ccPayload, respPayload, nil
}
// GetEnvelopeFromBlock gets an envelope from a block's Data field.
func GetEnvelopeFromBlock(data []byte) (*common.Envelope, error) {
//Block always begins with an envelope
var err error
env := &common.Envelope{}
if err = proto.Unmarshal(data, env); err != nil {
return nil, fmt.Errorf("Error getting envelope(%s)", err)
}
return env, nil
}
// CreateSignedEnvelope creates a signed envelope of the desired type, with marshaled dataMsg and signs it
func CreateSignedEnvelope(txType common.HeaderType, channelID string, signer crypto.LocalSigner, dataMsg proto.Message, msgVersion int32, epoch uint64) (*common.Envelope, error) {
payloadChannelHeader := MakeChannelHeader(txType, msgVersion, channelID, epoch)
payloadSignatureHeader, err := signer.NewSignatureHeader()
if err != nil {
return nil, err
}
data, err := proto.Marshal(dataMsg)
if err != nil {
return nil, err
}
paylBytes := MarshalOrPanic(&common.Payload{
Header: MakePayloadHeader(payloadChannelHeader, payloadSignatureHeader),
Data: data,
})
sig, err := signer.Sign(paylBytes)
if err != nil {
return nil, err
}
return &common.Envelope{Payload: paylBytes, Signature: sig}, nil
}
// CreateSignedTx assembles an Envelope message from proposal, endorsements, and a signer.
// This function should be called by a client when it has collected enough endorsements
// for a proposal to create a transaction and submit it to peers for ordering
func CreateSignedTx(proposal *peer.Proposal, signer msp.SigningIdentity, resps ...*peer.ProposalResponse) (*common.Envelope, error) {
if len(resps) == 0 {
return nil, fmt.Errorf("At least one proposal response is necessary")
}
// the original header
hdr, err := GetHeader(proposal.Header)
if err != nil {
return nil, fmt.Errorf("Could not unmarshal the proposal header")
}
// the original payload
pPayl, err := GetChaincodeProposalPayload(proposal.Payload)
if err != nil {
return nil, fmt.Errorf("Could not unmarshal the proposal payload")
}
// check that the signer is the same that is referenced in the header
// TODO: maybe worth removing?
signerBytes, err := signer.Serialize()
if err != nil {
return nil, err
}
shdr, err := GetSignatureHeader(hdr.SignatureHeader)
if err != nil {
return nil, err
}
if bytes.Compare(signerBytes, shdr.Creator) != 0 {
return nil, fmt.Errorf("The signer needs to be the same as the one referenced in the header")
}
// get header extensions so we have the visibility field
hdrExt, err := GetChaincodeHeaderExtension(hdr)
if err != nil {
return nil, err
}
// ensure that all actions are bitwise equal and that they are successful
var a1 []byte
for n, r := range resps {
if n == 0 {
a1 = r.Payload
if r.Response.Status != 200 {
return nil, fmt.Errorf("Proposal response was not successful, error code %d, msg %s", r.Response.Status, r.Response.Message)
}
continue
}
if bytes.Compare(a1, r.Payload) != 0 {
return nil, fmt.Errorf("ProposalResponsePayloads do not match")
}
}
// fill endorsements
endorsements := make([]*peer.Endorsement, len(resps))
for n, r := range resps {
endorsements[n] = r.Endorsement
}
// create ChaincodeEndorsedAction
cea := &peer.ChaincodeEndorsedAction{ProposalResponsePayload: resps[0].Payload, Endorsements: endorsements}
// obtain the bytes of the proposal payload that will go to the transaction
propPayloadBytes, err := GetBytesProposalPayloadForTx(pPayl, hdrExt.PayloadVisibility)
if err != nil {
return nil, err
}
// serialize the chaincode action payload
cap := &peer.ChaincodeActionPayload{ChaincodeProposalPayload: propPayloadBytes, Action: cea}
capBytes, err := GetBytesChaincodeActionPayload(cap)
if err != nil {
return nil, err
}
// create a transaction
taa := &peer.TransactionAction{Header: hdr.SignatureHeader, Payload: capBytes}
taas := make([]*peer.TransactionAction, 1)
taas[0] = taa
tx := &peer.Transaction{Actions: taas}
// serialize the tx
txBytes, err := GetBytesTransaction(tx)
if err != nil {
return nil, err
}
// create the payload
payl := &common.Payload{Header: hdr, Data: txBytes}
paylBytes, err := GetBytesPayload(payl)
if err != nil {
return nil, err
}
// sign the payload
sig, err := signer.Sign(paylBytes)
if err != nil {
return nil, err
}
// here's the envelope
return &common.Envelope{Payload: paylBytes, Signature: sig}, nil
}
// CreateProposalResponse creates a proposal response.
func CreateProposalResponse(hdrbytes []byte, payl []byte, response *peer.Response, results []byte, events []byte, ccid *peer.ChaincodeID, visibility []byte, signingEndorser msp.SigningIdentity) (*peer.ProposalResponse, error) {
hdr, err := GetHeader(hdrbytes)
if err != nil {
return nil, err
}
// obtain the proposal hash given proposal header, payload and the requested visibility
pHashBytes, err := GetProposalHash1(hdr, payl, visibility)
if err != nil {
return nil, fmt.Errorf("Could not compute proposal hash: err %s", err)
}
// get the bytes of the proposal response payload - we need to sign them
prpBytes, err := GetBytesProposalResponsePayload(pHashBytes, response, results, events, ccid)
if err != nil {
return nil, errors.New("Failure while marshaling the ProposalResponsePayload")
}
// serialize the signing identity
endorser, err := signingEndorser.Serialize()
if err != nil {
return nil, fmt.Errorf("Could not serialize the signing identity for %s, err %s", signingEndorser.GetIdentifier(), err)
}
// sign the concatenation of the proposal response and the serialized endorser identity with this endorser's key
signature, err := signingEndorser.Sign(append(prpBytes, endorser...))
if err != nil {
return nil, fmt.Errorf("Could not sign the proposal response payload, err %s", err)
}
resp := &peer.ProposalResponse{
// Timestamp: TODO!
Version: 1, // TODO: pick right version number
Endorsement: &peer.Endorsement{Signature: signature, Endorser: endorser},
Payload: prpBytes,
Response: &peer.Response{Status: 200, Message: "OK"}}
return resp, nil
}
// CreateProposalResponseFailure creates a proposal response for cases where
// endorsement proposal fails either due to a endorsement failure or a chaincode
// failure (chaincode response status >= shim.ERRORTHRESHOLD)
func CreateProposalResponseFailure(hdrbytes []byte, payl []byte, response *peer.Response, results []byte, events []byte, ccid *peer.ChaincodeID, visibility []byte) (*peer.ProposalResponse, error) {
hdr, err := GetHeader(hdrbytes)
if err != nil {
return nil, err
}
// obtain the proposal hash given proposal header, payload and the requested visibility
pHashBytes, err := GetProposalHash1(hdr, payl, visibility)
if err != nil {
return nil, fmt.Errorf("Could not compute proposal hash: err %s", err)
}
// get the bytes of the proposal response payload
prpBytes, err := GetBytesProposalResponsePayload(pHashBytes, response, results, events, ccid)
if err != nil {
return nil, errors.New("Failure while marshaling the ProposalResponsePayload")
}
resp := &peer.ProposalResponse{
// Timestamp: TODO!
Payload: prpBytes,
Response: &peer.Response{Status: 500, Message: "Chaincode Error"}}
return resp, nil
}
// GetSignedProposal returns a signed proposal given a Proposal message and a signing identity
func GetSignedProposal(prop *peer.Proposal, signer msp.SigningIdentity) (*peer.SignedProposal, error) {
// check for nil argument
if prop == nil || signer == nil {
return nil, fmt.Errorf("Nil arguments")
}
propBytes, err := GetBytesProposal(prop)
if err != nil {
return nil, err
}
signature, err := signer.Sign(propBytes)
if err != nil {
return nil, err
}
return &peer.SignedProposal{ProposalBytes: propBytes, Signature: signature}, nil
}
// GetSignedEvent returns a signed event given an Event message and a signing identity
func GetSignedEvent(evt *peer.Event, signer msp.SigningIdentity) (*peer.SignedEvent, error) {
// check for nil argument
if evt == nil || signer == nil {
return nil, errors.New("nil arguments")
}
evtBytes, err := proto.Marshal(evt)
if err != nil {
return nil, err
}
signature, err := signer.Sign(evtBytes)
if err != nil {
return nil, err
}
return &peer.SignedEvent{EventBytes: evtBytes, Signature: signature}, nil
}
// MockSignedEndorserProposalOrPanic creates a SignedProposal with the passed arguments
func MockSignedEndorserProposalOrPanic(chainID string, cs *peer.ChaincodeSpec, creator, signature []byte) (*peer.SignedProposal, *peer.Proposal) {
prop, _, err := CreateChaincodeProposal(
common.HeaderType_ENDORSER_TRANSACTION,
chainID,
&peer.ChaincodeInvocationSpec{ChaincodeSpec: cs},
creator)
if err != nil {
panic(err)
}
propBytes, err := GetBytesProposal(prop)
if err != nil {
panic(err)
}
return &peer.SignedProposal{ProposalBytes: propBytes, Signature: signature}, prop
}
func MockSignedEndorserProposal2OrPanic(chainID string, cs *peer.ChaincodeSpec, signer msp.SigningIdentity) (*peer.SignedProposal, *peer.Proposal) {
serializedSigner, err := signer.Serialize()
if err != nil {
panic(err)
}
prop, _, err := CreateChaincodeProposal(
common.HeaderType_ENDORSER_TRANSACTION,
chainID,
&peer.ChaincodeInvocationSpec{ChaincodeSpec: &peer.ChaincodeSpec{}},
serializedSigner)
if err != nil {
panic(err)
}
sProp, err := GetSignedProposal(prop, signer)
if err != nil {
panic(err)
}
return sProp, prop
}
// GetBytesProposalPayloadForTx takes a ChaincodeProposalPayload and returns its serialized
// version according to the visibility field
func GetBytesProposalPayloadForTx(payload *peer.ChaincodeProposalPayload, visibility []byte) ([]byte, error) {
// check for nil argument
if payload == nil /* || visibility == nil */ {
return nil, fmt.Errorf("Nil arguments")
}
// strip the transient bytes off the payload - this needs to be done no matter the visibility mode
cppNoTransient := &peer.ChaincodeProposalPayload{Input: payload.Input, TransientMap: nil}
cppBytes, err := GetBytesChaincodeProposalPayload(cppNoTransient)
if err != nil {
return nil, errors.New("Failure while marshalling the ChaincodeProposalPayload!")
}
// currently the fabric only supports full visibility: this means that
// there are no restrictions on which parts of the proposal payload will
// be visible in the final transaction; this default approach requires
// no additional instructions in the PayloadVisibility field; however
// the fabric may be extended to encode more elaborate visibility
// mechanisms that shall be encoded in this field (and handled
// appropriately by the peer)
return cppBytes, nil
}
// GetProposalHash2 gets the proposal hash - this version
// is called by the committer where the visibility policy
// has already been enforced and so we already get what
// we have to get in ccPropPayl
func GetProposalHash2(header *common.Header, ccPropPayl []byte) ([]byte, error) {
// check for nil argument
if header == nil ||
header.ChannelHeader == nil ||
header.SignatureHeader == nil ||
ccPropPayl == nil {
return nil, fmt.Errorf("Nil arguments")
}
hash, err := factory.GetDefault().GetHash(&bccsp.SHA256Opts{})
if err != nil {
return nil, fmt.Errorf("Failed instantiating hash function [%s]", err)
}
hash.Write(header.ChannelHeader) // hash the serialized Channel Header object
hash.Write(header.SignatureHeader) // hash the serialized Signature Header object
hash.Write(ccPropPayl) // hash the bytes of the chaincode proposal payload that we are given
return hash.Sum(nil), nil
}
// GetProposalHash1 gets the proposal hash bytes after sanitizing the
// chaincode proposal payload according to the rules of visibility
func GetProposalHash1(header *common.Header, ccPropPayl []byte, visibility []byte) ([]byte, error) {
// check for nil argument
if header == nil ||
header.ChannelHeader == nil ||
header.SignatureHeader == nil ||
ccPropPayl == nil /* || visibility == nil */ {
return nil, fmt.Errorf("Nil arguments")
}
// unmarshal the chaincode proposal payload
cpp := &peer.ChaincodeProposalPayload{}
err := proto.Unmarshal(ccPropPayl, cpp)
if err != nil {
return nil, errors.New("Failure while unmarshalling the ChaincodeProposalPayload!")
}
ppBytes, err := GetBytesProposalPayloadForTx(cpp, visibility)
if err != nil {
return nil, err
}
hash2, err := factory.GetDefault().GetHash(&bccsp.SHA256Opts{})
if err != nil {
return nil, fmt.Errorf("Failed instantiating hash function [%s]", err)
}
hash2.Write(header.ChannelHeader) // hash the serialized Channel Header object
hash2.Write(header.SignatureHeader) // hash the serialized Signature Header object
hash2.Write(ppBytes) // hash of the part of the chaincode proposal payload that will go to the tx
return hash2.Sum(nil), nil
}