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store.go
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store.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package privdata
import (
"fmt"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric-protos-go/peer"
pb "github.com/hyperledger/fabric-protos-go/peer"
"github.com/hyperledger/fabric/core/ledger"
"github.com/hyperledger/fabric/msp"
mspmgmt "github.com/hyperledger/fabric/msp/mgmt"
"github.com/hyperledger/fabric/protoutil"
"github.com/pkg/errors"
)
// State retrieves data from the state.
type State interface {
// GetState retrieves the value for the given key in the given namespace
GetState(namespace string, key string) ([]byte, error)
}
type NoSuchCollectionError CollectionCriteria
func (f NoSuchCollectionError) Error() string {
return fmt.Sprintf("collection %s/%s/%s could not be found", f.Channel, f.Namespace, f.Collection)
}
// A QueryExecutorFactory is responsible for creating ledger.QueryExectuor
// instances.
type QueryExecutorFactory interface {
NewQueryExecutor() (ledger.QueryExecutor, error)
}
// ChaincodeInfoProvider provides information about deployed chaincode.
// LSCC module is expected to provide an implementation for this dependencys
type ChaincodeInfoProvider interface {
// ChaincodeInfo returns the info about a deployed chaincode.
ChaincodeInfo(channelName, chaincodeName string, qe ledger.SimpleQueryExecutor) (*ledger.DeployedChaincodeInfo, error)
// CollectionInfo returns the proto msg that defines the named collection.
// This function can be used for both explicit and implicit collections.
CollectionInfo(channelName, chaincodeName, collectionName string, qe ledger.SimpleQueryExecutor) (*peer.StaticCollectionConfig, error)
// AllCollectionsConfigPkg returns a combined collection config pkg that contains both explicit and implicit collections
AllCollectionsConfigPkg(channelName, chaincodeName string, qe ledger.SimpleQueryExecutor) (*peer.CollectionConfigPackage, error)
}
// IdentityDeserializerFactory creates msp.IdentityDeserializer for
// a chain.
type IdentityDeserializerFactory interface {
GetIdentityDeserializer(chainID string) msp.IdentityDeserializer
}
// IdentityDeserializerFactoryFunc is a function adapater for
// IdentityDeserializerFactory.
type IdentityDeserializerFactoryFunc func(chainID string) msp.IdentityDeserializer
func (i IdentityDeserializerFactoryFunc) GetIdentityDeserializer(chainID string) msp.IdentityDeserializer {
return i(chainID)
}
// CollectionCriteria defines an element of a private data that corresponds
// to a certain transaction and collection
type CollectionCriteria struct {
Channel string
Collection string
Namespace string
}
type SimpleCollectionStore struct {
qeFactory QueryExecutorFactory
ccInfoProvider ChaincodeInfoProvider
idDeserializerFactory IdentityDeserializerFactory
}
func NewSimpleCollectionStore(qeFactory QueryExecutorFactory, ccInfoProvider ChaincodeInfoProvider) *SimpleCollectionStore {
return &SimpleCollectionStore{
qeFactory: qeFactory,
ccInfoProvider: ccInfoProvider,
idDeserializerFactory: IdentityDeserializerFactoryFunc(func(chainID string) msp.IdentityDeserializer {
return mspmgmt.GetManagerForChain(chainID)
}),
}
}
func (c *SimpleCollectionStore) retrieveCollectionConfigPackage(cc CollectionCriteria, qe ledger.QueryExecutor) (*peer.CollectionConfigPackage, error) {
var err error
if qe == nil {
qe, err = c.qeFactory.NewQueryExecutor()
if err != nil {
return nil, errors.WithMessagef(err, "could not retrieve query executor for collection criteria %#v", cc)
}
defer qe.Done()
}
return c.ccInfoProvider.AllCollectionsConfigPkg(cc.Channel, cc.Namespace, qe)
}
// RetrieveCollectionConfigPackageFromState retrieves the collection config package from the given key from the given state
func RetrieveCollectionConfigPackageFromState(cc CollectionCriteria, state State) (*peer.CollectionConfigPackage, error) {
cb, err := state.GetState("lscc", BuildCollectionKVSKey(cc.Namespace))
if err != nil {
return nil, errors.WithMessagef(err, "error while retrieving collection for collection criteria %#v", cc)
}
if cb == nil {
return nil, NoSuchCollectionError(cc)
}
conf, err := ParseCollectionConfig(cb)
if err != nil {
return nil, errors.Wrapf(err, "invalid configuration for collection criteria %#v", cc)
}
return conf, nil
}
// ParseCollectionConfig parses the collection configuration from the given serialized representation.
func ParseCollectionConfig(colBytes []byte) (*peer.CollectionConfigPackage, error) {
collections := &peer.CollectionConfigPackage{}
err := proto.Unmarshal(colBytes, collections)
if err != nil {
return nil, errors.WithStack(err)
}
return collections, nil
}
// RetrieveCollectionConfig retrieves a collection's config
func (c *SimpleCollectionStore) RetrieveCollectionConfig(cc CollectionCriteria) (*peer.StaticCollectionConfig, error) {
return c.retrieveCollectionConfig(cc, nil)
}
func (c *SimpleCollectionStore) retrieveCollectionConfig(cc CollectionCriteria, qe ledger.QueryExecutor) (*peer.StaticCollectionConfig, error) {
var err error
if qe == nil {
qe, err = c.qeFactory.NewQueryExecutor()
if err != nil {
return nil, errors.WithMessagef(err, "could not retrieve query executor for collection criteria %#v", cc)
}
defer qe.Done()
}
collConfig, err := c.ccInfoProvider.CollectionInfo(cc.Channel, cc.Namespace, cc.Collection, qe)
if err != nil {
return nil, err
}
if collConfig == nil {
return nil, NoSuchCollectionError(cc)
}
return collConfig, nil
}
func (c *SimpleCollectionStore) retrieveSimpleCollection(cc CollectionCriteria, qe ledger.QueryExecutor) (*SimpleCollection, error) {
staticCollectionConfig, err := c.retrieveCollectionConfig(cc, qe)
if err != nil {
return nil, err
}
sc := &SimpleCollection{}
err = sc.Setup(staticCollectionConfig, c.idDeserializerFactory.GetIdentityDeserializer(cc.Channel))
if err != nil {
return nil, errors.WithMessagef(err, "error setting up collection for collection criteria %#v", cc)
}
return sc, nil
}
func (c *SimpleCollectionStore) AccessFilter(channelName string, collectionPolicyConfig *peer.CollectionPolicyConfig) (Filter, error) {
sc := &SimpleCollection{}
err := sc.setupAccessPolicy(collectionPolicyConfig, c.idDeserializerFactory.GetIdentityDeserializer(channelName))
if err != nil {
return nil, err
}
return sc.AccessFilter(), nil
}
func (c *SimpleCollectionStore) RetrieveCollection(cc CollectionCriteria) (Collection, error) {
return c.retrieveSimpleCollection(cc, nil)
}
func (c *SimpleCollectionStore) RetrieveCollectionAccessPolicy(cc CollectionCriteria) (CollectionAccessPolicy, error) {
return c.retrieveSimpleCollection(cc, nil)
}
func (c *SimpleCollectionStore) RetrieveCollectionConfigPackage(cc CollectionCriteria) (*peer.CollectionConfigPackage, error) {
return c.retrieveCollectionConfigPackage(cc, nil)
}
// RetrieveCollectionPersistenceConfigs retrieves the collection's persistence related configurations
func (c *SimpleCollectionStore) RetrieveCollectionPersistenceConfigs(cc CollectionCriteria) (CollectionPersistenceConfigs, error) {
staticCollectionConfig, err := c.retrieveCollectionConfig(cc, nil)
if err != nil {
return nil, err
}
return &SimpleCollectionPersistenceConfigs{staticCollectionConfig.BlockToLive}, nil
}
// RetrieveReadWritePermission retrieves the read-write persmission of the creator of the
// signedProposal for a given collection using collection access policy and flags such as
// memberOnlyRead & memberOnlyWrite
func (c *SimpleCollectionStore) RetrieveReadWritePermission(
cc CollectionCriteria,
signedProposal *pb.SignedProposal,
qe ledger.QueryExecutor,
) (bool, bool, error) {
collection, err := c.retrieveSimpleCollection(cc, qe)
if err != nil {
return false, false, err
}
if canAnyoneReadAndWrite(collection) {
return true, true, nil
}
// all members have read-write persmission
if isAMember, err := isCreatorOfProposalAMember(signedProposal, collection); err != nil {
return false, false, err
} else if isAMember {
return true, true, nil
}
return !collection.IsMemberOnlyRead(), !collection.IsMemberOnlyWrite(), nil
}
func canAnyoneReadAndWrite(collection *SimpleCollection) bool {
if !collection.IsMemberOnlyRead() && !collection.IsMemberOnlyWrite() {
return true
}
return false
}
func isCreatorOfProposalAMember(signedProposal *pb.SignedProposal, collection *SimpleCollection) (bool, error) {
signedData, err := getSignedData(signedProposal)
if err != nil {
return false, err
}
accessFilter := collection.AccessFilter()
return accessFilter(signedData), nil
}
func getSignedData(signedProposal *pb.SignedProposal) (protoutil.SignedData, error) {
proposal, err := protoutil.UnmarshalProposal(signedProposal.ProposalBytes)
if err != nil {
return protoutil.SignedData{}, err
}
hdr, err := protoutil.UnmarshalHeader(proposal.Header)
if err != nil {
return protoutil.SignedData{}, err
}
shdr, err := protoutil.UnmarshalSignatureHeader(hdr.SignatureHeader)
if err != nil {
return protoutil.SignedData{}, err
}
return protoutil.SignedData{
Data: signedProposal.ProposalBytes,
Identity: shdr.Creator,
Signature: signedProposal.Signature,
}, nil
}