Introduce LoadConfigBlockMaterial

Signed-off-by: Liran Funaro <liran.funaro@gmail.com>

Author: liran-funaro

common/channelconfig/load.go

@@ -0,0 +1,156 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package channelconfig
+
+import (
+	"github.com/cockroachdb/errors"
+	"github.com/hyperledger/fabric-lib-go/bccsp/factory"
+	"github.com/hyperledger/fabric-protos-go-apiv2/common"
+
+	commontypes "github.com/hyperledger/fabric-x-common/api/types"
+	"github.com/hyperledger/fabric-x-common/common/configtx"
+	"github.com/hyperledger/fabric-x-common/protoutil"
+)
+
+type (
+	// ConfigBlockMaterial contains the channel-ID, the config block, its bundle, and the organization's material.
+	ConfigBlockMaterial struct {
+		ChannelID                string
+		ConfigBlock              *common.Block
+		Bundle                   *Bundle
+		OrdererOrganizations     []*OrdererOrganizationMaterial
+		ApplicationOrganizations []*OrganizationMaterial
+	}
+
+	// OrganizationMaterial contains the MspID (Organization ID), and its root CAs in bytes.
+	OrganizationMaterial struct {
+		MspID   string
+		CACerts [][]byte
+	}
+
+	// OrdererOrganizationMaterial contains the MspID (Organization ID), orderer endpoints, and their root CAs in bytes.
+	OrdererOrganizationMaterial struct {
+		OrganizationMaterial
+		Endpoints []*commontypes.OrdererEndpoint
+	}
+)
+
+// ErrNotConfigBlock is returned when the block is not a config block.
+var ErrNotConfigBlock = errors.New("the block is not a config block")
+
+// LoadConfigBlockMaterialFromFile loads a config block from a file.
+// If the block is not a config block, ErrNotConfigBlock will be returned.
+func LoadConfigBlockMaterialFromFile(blockPath string) (*ConfigBlockMaterial, error) {
+	if blockPath == "" {
+		return nil, errors.New("config block path is empty")
+	}
+	configBlock, err := protoutil.ReadBlockFromFile(blockPath)
+	if err != nil {
+		return nil, err
+	}
+	return LoadConfigBlockMaterial(configBlock)
+}
+
+// LoadConfigBlockMaterial attempts to read a config block from the given block.
+// If the block is not a config block, ErrNotConfigBlock will be returned.
+func LoadConfigBlockMaterial(block *common.Block) (*ConfigBlockMaterial, error) {
+	// We expect config blocks to have exactly one transaction, with a valid payload.
+	if block == nil || block.Data == nil || len(block.Data.Data) != 1 {
+		return nil, ErrNotConfigBlock
+	}
+	configTx, err := protoutil.GetEnvelopeFromBlock(block.Data.Data[0])
+	if err != nil {
+		return nil, errors.Join(ErrNotConfigBlock, err)
+	}
+
+	payload, err := protoutil.UnmarshalPayload(configTx.Payload)
+	if err != nil {
+		return nil, errors.Join(ErrNotConfigBlock, err)
+	}
+	if payload.Header == nil {
+		return nil, ErrNotConfigBlock
+	}
+	chHead, err := protoutil.UnmarshalChannelHeader(payload.Header.ChannelHeader)
+	if err != nil || chHead.Type != int32(common.HeaderType_CONFIG) {
+		return nil, errors.Join(ErrNotConfigBlock, err)
+	}
+
+	// This is a config block. Let's parse it.
+	configEnvelope, err := configtx.UnmarshalConfigEnvelope(payload.Data)
+	if err != nil {
+		return nil, errors.Wrap(err, "error unmarshalling config envelope from payload data")
+	}
+
+	bundle, err := NewBundle(chHead.ChannelId, configEnvelope.Config, factory.GetDefault())
+	if err != nil {
+		return nil, errors.Wrap(err, "error creating channel config bundle")
+	}
+	ordererOrgs, err := newOrdererOrganizationsMaterialsFromBundle(bundle)
+	if err != nil {
+		return nil, err
+	}
+	applicationOrgs, err := newApplicationOrganizationsMaterialsFromBundle(bundle)
+	if err != nil {
+		return nil, err
+	}
+	return &ConfigBlockMaterial{
+		ChannelID:                chHead.ChannelId,
+		ConfigBlock:              block,
+		Bundle:                   bundle,
+		OrdererOrganizations:     ordererOrgs,
+		ApplicationOrganizations: applicationOrgs,
+	}, nil
+}
+
+// newOrdererOrganizationsMaterialsFromBundle reads the organizations' materials from a config block bundle.
+func newOrdererOrganizationsMaterialsFromBundle(bundle *Bundle) ([]*OrdererOrganizationMaterial, error) {
+	ordererCfg, ok := bundle.OrdererConfig()
+	if !ok {
+		return nil, errors.New("could not find orderer config")
+	}
+	orgs := ordererCfg.Organizations()
+	orgsMaterial := newOrganizationsMaterials(orgs)
+
+	ordererOrgMaterial := make([]*OrdererOrganizationMaterial, len(orgsMaterial))
+	for i, org := range orgsMaterial {
+		var endpoints []*commontypes.OrdererEndpoint
+		endpointsStr := orgs[org.MspID].Endpoints()
+		for _, eStr := range endpointsStr {
+			e, err := commontypes.ParseOrdererEndpoint(eStr)
+			if err != nil {
+				return nil, err
+			}
+			e.MspID = org.MspID
+			endpoints = append(endpoints, e)
+		}
+		ordererOrgMaterial[i] = &OrdererOrganizationMaterial{
+			OrganizationMaterial: *org,
+			Endpoints:            endpoints,
+		}
+	}
+	return ordererOrgMaterial, nil
+}
+
+// newApplicationOrganizationsMaterialsFromBundle reads the organizations' materials from a config block bundle.
+func newApplicationOrganizationsMaterialsFromBundle(bundle *Bundle) ([]*OrganizationMaterial, error) {
+	applicationCfg, ok := bundle.ApplicationConfig()
+	if !ok {
+		return nil, errors.New("could not find application config")
+	}
+	return newOrganizationsMaterials(applicationCfg.Organizations()), nil
+}
+
+func newOrganizationsMaterials[T Org](orgs map[string]T) []*OrganizationMaterial {
+	organizationMaterials := make([]*OrganizationMaterial, 0, len(orgs))
+	for orgID, org := range orgs {
+		organizationMaterials = append(organizationMaterials, &OrganizationMaterial{
+			MspID:   orgID,
+			CACerts: org.MSP().GetTLSRootCerts(),
+		})
+	}
+	return organizationMaterials
+}