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serve.go
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serve.go
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package serve
import (
"context"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"fmt"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/99designs/gqlgen/graphql/handler/apollotracing"
"github.com/99designs/gqlgen/graphql/handler/extension"
"github.com/99designs/gqlgen/graphql/handler/lru"
"github.com/99designs/gqlgen/graphql/handler/transport"
"github.com/99designs/gqlgen/graphql/playground"
gqlgengraphql "github.com/99designs/gqlgen/graphql"
jwtmiddleware "github.com/auth0/go-jwt-middleware"
"github.com/form3tech-oss/jwt-go"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
"github.com/hyperledger/fabric-gateway/pkg/client"
"github.com/hyperledger/fabric-gateway/pkg/identity"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
"github.com/kfsoftware/hlf-operator-ui/api/gql"
"github.com/kfsoftware/hlf-operator-ui/api/gql/resolvers"
"github.com/kfsoftware/hlf-operator-ui/api/log"
"github.com/kfsoftware/hlf-operator/controllers/utils"
operatorv1 "github.com/kfsoftware/hlf-operator/pkg/client/clientset/versioned"
"github.com/lestrrat-go/jwx/jwk"
"github.com/pkg/errors"
"github.com/slok/go-http-metrics/metrics/prometheus"
"github.com/slok/go-http-metrics/middleware"
middlewarestd "github.com/slok/go-http-metrics/middleware/std"
"github.com/spf13/cobra"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"io"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"net/http"
"os"
"strings"
"time"
)
type serveConfig struct {
address string
hlfConfig string
user string
mspID string
authJWKS string
authIssuer string
}
type serveCmd struct {
address string
hlfConfig string
user string
mspID string
authJWKS string
authIssuer string
}
type IdentityStruct struct {
Identity identity.Identity
Sign identity.Sign
}
func getGateway(clientConnection *grpc.ClientConn, identity *IdentityStruct) (*client.Gateway, error) {
gw, err := client.Connect(
identity.Identity,
client.WithSign(identity.Sign),
client.WithClientConnection(clientConnection),
client.WithEvaluateTimeout(5*time.Second),
client.WithEndorseTimeout(15*time.Second),
client.WithSubmitTimeout(5*time.Second),
client.WithCommitStatusTimeout(1*time.Minute),
)
if err != nil {
return nil, err
}
return gw, nil
}
func (s serveCmd) run() error {
kubeConfigPath := os.Getenv("KUBECONFIG")
kubeConfig, err := clientcmd.BuildConfigFromFlags("", kubeConfigPath)
if err != nil {
return err
}
kubeClient, err := kubernetes.NewForConfig(kubeConfig)
if err != nil {
return err
}
hlfClient, err := operatorv1.NewForConfig(kubeConfig)
if err != nil {
return err
}
var sdk *fabsdk.FabricSDK
var cfgProvider []core.ConfigBackend
var gw *client.Gateway
if s.hlfConfig != "" {
configBackend := config.FromFile(s.hlfConfig)
cfgProvider, err = configBackend()
if err != nil {
return err
}
sdk, err = fabsdk.New(configBackend)
if err != nil {
return err
}
configBackend1, err := sdk.Config()
if err != nil {
return err
}
peersInt, _ := configBackend1.Lookup(fmt.Sprintf("organizations.%s.peers", s.mspID))
peersArrayInterface := peersInt.([]interface{})
var peers []string
idx := 0
var peerUrl string
var peerTLSCACert []byte
for _, item := range peersArrayInterface {
peerName := item.(string)
peers = append(peers, peerName)
peerUrlKey := fmt.Sprintf("peers.%s.url", peerName)
peerTLSCACertKey := fmt.Sprintf("peers.%s.tlsCACerts.pem", peerName)
peerUrlInt, _ := configBackend1.Lookup(peerUrlKey)
peerTLSCACertInt, _ := configBackend1.Lookup(peerTLSCACertKey)
peerUrl = strings.Replace(peerUrlInt.(string), "grpcs://", "", -1)
peerTLSCACert = []byte(peerTLSCACertInt.(string))
idx++
if idx >= 1 {
break
}
}
userCertKey := fmt.Sprintf("organizations.%s.users.%s.cert.pem", s.mspID, s.user)
userPrivateKey := fmt.Sprintf("organizations.%s.users.%s.key.pem", s.mspID, s.user)
userPrivateCertString, certExists := configBackend1.Lookup(userCertKey)
if !certExists {
return fmt.Errorf("user cert not found")
}
userPrivateKeyString, keyExists := configBackend1.Lookup(userPrivateKey)
if !keyExists {
return fmt.Errorf("user key not found")
}
grpcConn, err := newGrpcConnection(peerUrl, peerTLSCACert)
if err != nil {
return err
}
cert, err := utils.ParseX509Certificate([]byte(userPrivateCertString.(string)))
if err != nil {
return err
}
x509Identity, err := identity.NewX509Identity(s.mspID, cert)
if err != nil {
return err
}
privateKey, err := identity.PrivateKeyFromPEM([]byte(userPrivateKeyString.(string)))
if err != nil {
return err
}
sign, err := identity.NewPrivateKeySign(privateKey)
if err != nil {
return err
}
gw, err = getGateway(grpcConn, &IdentityStruct{
Identity: x509Identity,
Sign: sign,
})
if err != nil {
return err
}
}
gqlConfig := gql.Config{
Resolvers: &resolvers.Resolver{
MSPID: s.mspID,
User: s.user,
KubeClient: kubeClient,
Config: kubeConfig,
HLFClient: hlfClient,
FabricSDK: sdk,
ConfigBackends: cfgProvider,
Gateway: gw,
},
}
gqlConfig.Directives.RequiresAuth = func(ctx context.Context, obj interface{}, next gqlgengraphql.Resolver) (interface{}, error) {
if s.authJWKS == "" || s.authIssuer == "" {
return next(ctx)
}
user := ctx.Value("user")
if user == nil {
return nil, errors.New("access denied")
}
return next(ctx)
}
es := gql.NewExecutableSchema(gqlConfig)
h := handler.New(es)
h.AddTransport(transport.Options{})
h.AddTransport(transport.GET{})
h.AddTransport(transport.POST{})
h.AddTransport(transport.MultipartForm{})
h.SetQueryCache(lru.New(1000))
h.Use(extension.Introspection{})
h.Use(extension.AutomaticPersistedQuery{
Cache: lru.New(100),
})
h.Use(apollotracing.Tracer{})
serverMux := gin.Default()
serverMux.Use(cors.New(cors.Config{
AllowOrigins: []string{"*"},
AllowMethods: []string{"GET", "PUT", "PATCH"},
AllowHeaders: []string{"X-MC-User", "X-MC-MSPID", "Authorization", "Content-Type"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
AllowOriginFunc: func(origin string) bool {
return true
},
MaxAge: 12 * time.Hour,
}))
graphqlHandler := gin.HandlerFunc(func(c *gin.Context) {
c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With, X-Identity")
c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT")
h.ServeHTTP(c.Writer, c.Request)
})
serverMux.Any(
"/graphql",
graphqlHandler,
)
serverMux.GET(
"/playground",
playgroundHandler(),
)
serverMux.GET(
"/healthz",
func(c *gin.Context) {
c.Writer.WriteHeader(http.StatusOK)
c.Writer.Header().Set("Content-Type", "application/json")
io.WriteString(c.Writer, `{"alive": true}`)
},
)
mdlw := middleware.New(middleware.Config{
Recorder: prometheus.NewRecorder(prometheus.Config{}),
})
httpHandler := middlewarestd.Handler("", mdlw, serverMux)
if s.authIssuer != "" && s.authJWKS != "" {
jwtMiddleware := jwtmiddleware.New(jwtmiddleware.Options{
ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
iss := s.authIssuer
checkIss := token.Claims.(jwt.MapClaims).VerifyIssuer(iss, false)
if !checkIss {
return token, errors.New("Invalid issuer.")
}
cert, err := getPemCert(token, s.authJWKS)
if err != nil {
return nil, err
}
return cert, nil
},
SigningMethod: jwt.SigningMethodRS256,
CredentialsOptional: true,
})
httpHandler = jwtMiddleware.Handler(httpHandler)
}
log.Infof("Server listening on %s", s.address)
return http.ListenAndServe(s.address, httpHandler)
}
// Defining the Playground handler
func playgroundHandler() gin.HandlerFunc {
h := playground.Handler("GraphQL", "/graphql")
return func(c *gin.Context) {
h.ServeHTTP(c.Writer, c.Request)
}
}
// newGrpcConnection creates a gRPC connection to the Gateway server.
func newGrpcConnection(peerEndpoint string, tlsCert []byte) (*grpc.ClientConn, error) {
certificate, err := identity.CertificateFromPEM(tlsCert)
if err != nil {
return nil, fmt.Errorf("failed to obtain commit status: %w", err)
}
certPool := x509.NewCertPool()
certPool.AddCert(certificate)
transportCredentials := credentials.NewClientTLSFromCert(certPool, "")
connection, err := grpc.Dial(peerEndpoint, grpc.WithTransportCredentials(transportCredentials))
if err != nil {
return nil, fmt.Errorf("failed to evaluate transaction: %w", err)
}
return connection, nil
}
func NewServeCommand() *cobra.Command {
conf := &serveConfig{}
cmd := &cobra.Command{
Use: "serve",
Short: "serve",
Long: "serve",
RunE: func(cmd *cobra.Command, args []string) error {
s := &serveCmd{
address: conf.address,
hlfConfig: conf.hlfConfig,
user: conf.user,
mspID: conf.mspID,
authJWKS: conf.authJWKS,
authIssuer: conf.authIssuer,
}
return s.run()
},
}
f := cmd.Flags()
f.StringVar(&conf.address, "address", "", "address for the server")
f.StringVar(&conf.hlfConfig, "hlf-config", "", "HLF configuration")
f.StringVar(&conf.mspID, "msp-id", "", "MSP ID to use for the HLF configuration")
f.StringVar(&conf.user, "user", "", "User to use for the HLF configuration")
f.StringVarP(&conf.authJWKS, "auth-jwks", "", "", "auth jwks")
f.StringVarP(&conf.authIssuer, "auth-issuer", "", "", "auth issuer")
return cmd
}
type Jwks struct {
Keys []JSONWebKeys `json:"keys"`
}
type JSONWebKeys struct {
Kty string `json:"kty"`
Kid string `json:"kid"`
Use string `json:"use"`
N string `json:"n"`
E string `json:"e"`
X5c []string `json:"x5c"`
}
func getPemCert(token *jwt.Token, jwksUrl string) (*rsa.PublicKey, error) {
kid := token.Header["kid"].(string)
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
httpClient := &http.Client{Transport: tr}
set, err := jwk.Fetch(context.Background(), jwksUrl, jwk.WithHTTPClient(httpClient))
if err != nil {
log.Printf("failed to parse JWK: %s", err)
return nil, err
}
k, exists := set.LookupKeyID(kid)
if !exists {
return nil, errors.Errorf("kid %s not found in jwks", kid)
}
var rawKey interface{}
err = k.Raw(&rawKey)
if !exists {
return nil, err
}
rsaKey, ok := rawKey.(*rsa.PublicKey)
if !ok {
return nil, errors.Errorf("kid %s not found in jwks", kid)
}
return rsaKey, nil
}