[FABG-871] Generate the genesis block MSP directory

The genesis block profile contains only a reference to the MSP
directory, which has to be generated before the genesis block
can be created.

Change-Id: Ie2b620a419724d8d6caeae8223718a5ef3f3b027
Signed-off-by: Aleksandar Likic <aleksandar.likic@securekey.com>

pkg/fab/resource/configtxmsp.go

@@ -0,0 +1,86 @@
+/*
+Copyright SecureKey Technologies Inc. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package resource
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/gogo/protobuf/proto"
+
+	mspcfg "github.com/hyperledger/fabric-sdk-go/internal/github.com/hyperledger/fabric/msp"
+	"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/msp"
+)
+
+const (
+	cacerts              = "cacerts"
+	admincerts           = "admincerts"
+	signcerts            = "signcerts"
+	keystore             = "keystore"
+	intermediatecerts    = "intermediatecerts"
+	crlsfolder           = "crls"
+	configfilename       = "config.yaml"
+	tlscacerts           = "tlscacerts"
+	tlsintermediatecerts = "tlsintermediatecerts"
+)
+
+// GenerateMspDir generates a MSP directory, using values from the provided MSP config.
+// The intended usage is within the scope of creating a genesis block. This means
+// private keys are currently not handled.
+func GenerateMspDir(mspDir string, config *msp.MSPConfig) error {
+
+	if mspcfg.ProviderTypeToString(mspcfg.ProviderType(config.Type)) != "bccsp" {
+		return fmt.Errorf("Unsupported MSP config type")
+	}
+
+	cfg := &msp.FabricMSPConfig{}
+	err := proto.Unmarshal(config.Config, cfg)
+	if err != nil {
+		return err
+	}
+
+	type certDirDefinition struct {
+		dir   string
+		certs [][]byte
+	}
+	defs := []certDirDefinition{
+		{cacerts, cfg.RootCerts},
+		{admincerts, cfg.Admins},
+		{intermediatecerts, cfg.IntermediateCerts},
+		{tlscacerts, cfg.TlsRootCerts},
+		{tlsintermediatecerts, cfg.TlsIntermediateCerts},
+		{crlsfolder, cfg.RevocationList},
+	}
+	for _, d := range defs {
+		err := generateCertDir(filepath.Join(mspDir, d.dir), d.certs)
+		if err != nil {
+			return err
+		}
+	}
+
+	return err
+}
+
+func generateCertDir(certDir string, certs [][]byte) error {
+	err := os.MkdirAll(certDir, 0755)
+	if err != nil {
+		return err
+	}
+	if len(certs) == 0 {
+		return nil
+	}
+	for counter, certBytes := range certs {
+		fileName := filepath.Join(certDir, "cert"+fmt.Sprintf("%d", counter)+".pem")
+		err = ioutil.WriteFile(fileName, certBytes, 0644)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

pkg/fab/resource/configtxmsp_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright SecureKey Technologies Inc. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package resource
+
+import (
+	"fmt"
+	"math/rand"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+
+	"github.com/hyperledger/fabric-sdk-go/test/metadata"
+
+	mspcfg "github.com/hyperledger/fabric-sdk-go/internal/github.com/hyperledger/fabric/msp"
+	"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/msp"
+	"github.com/stretchr/testify/require"
+)
+
+func randomMspDir() string {
+	rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
+	return "/tmp/msp/" + fmt.Sprintf("%d", rnd.Uint64())
+}
+
+func TestGenerateMspDir(t *testing.T) {
+
+	ordererMspDir := filepath.Join(metadata.GetProjectPath(), "test/fixtures/fabric/v1/crypto-config/ordererOrganizations/example.com/orderers/orderer.example.com/msp")
+	cfg, err := mspcfg.GetVerifyingMspConfig(ordererMspDir, "mymspid", "bccsp")
+	require.NoError(t, err, "Error generating msp config from dir")
+	mspConfig := &msp.FabricMSPConfig{}
+	err = proto.Unmarshal(cfg.Config, mspConfig)
+	require.NoError(t, err, "Error unmarshaling msp config")
+
+	dir := randomMspDir()
+
+	err = GenerateMspDir(dir, cfg)
+	require.NoError(t, err, "Error generating msp dir")
+
+	cfg1, err := mspcfg.GetVerifyingMspConfig(dir, "mymspid", "bccsp")
+	require.NoError(t, err, "Error generating msp config from dir1")
+	mspConfig1 := &msp.FabricMSPConfig{}
+	err = proto.Unmarshal(cfg1.Config, mspConfig1)
+	require.NoError(t, err, "Error unmarshaling msp config1")
+
+	require.Equal(t, mspConfig.RootCerts, mspConfig1.RootCerts, "RootCerts are different")
+	require.Equal(t, mspConfig.RevocationList, mspConfig1.RevocationList, "RevocationList are different")
+	require.Equal(t, mspConfig.TlsIntermediateCerts, mspConfig1.TlsIntermediateCerts, "TlsIntermediateCerts are different")
+	require.Equal(t, mspConfig.TlsRootCerts, mspConfig1.TlsRootCerts, "TlsRootCerts are different")
+	require.Equal(t, mspConfig.IntermediateCerts, mspConfig1.IntermediateCerts, "IntermediateCerts are different")
+	require.Equal(t, mspConfig.Admins, mspConfig1.Admins, "Admins are different")
+}