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grpc_server.go
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grpc_server.go
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package main
import (
"errors"
"flag"
"log"
"net"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/salrashid123/grpc_google_id_tokens/echo"
"google.golang.org/api/idtoken"
//sal "github.com/salrashid123/oauth2/google"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
)
var (
grpcport = flag.String("grpcport", ":8080", "grpcport")
usetls = flag.Bool("usetls", false, "startup using TLS")
serverCert = flag.String("cert", "server_crt.pem", "Server TLS cert")
serverKey = flag.String("key", "server_key.pem", "Server TLS key")
targetAudience = flag.String("targetAudience", "", "OIDC audience to check")
validateToken = flag.Bool("validateToken", false, "validateToken field")
)
const ()
type server struct {
}
type contextKey string
func authUnaryInterceptor(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
md, _ := metadata.FromIncomingContext(ctx)
if len(md["authorization"]) > 0 {
reqToken := md["authorization"][0]
splitToken := strings.Split(reqToken, "Bearer")
reqToken = strings.TrimSpace(splitToken[1])
uid, err := verifyToken(ctx, reqToken, *targetAudience)
if err != nil {
return nil, grpc.Errorf(codes.Unauthenticated, "authentication required")
}
newCtx := context.WithValue(ctx, contextKey("uid"), uid)
return handler(newCtx, req)
}
return nil, grpc.Errorf(codes.Unauthenticated, "Authorization header not provided")
}
func verifyToken(ctx context.Context, token string, targetAudience string) (sub string, err error) {
validTok, err := idtoken.Validate(ctx, token, targetAudience)
if err != nil {
return "", err
}
if validTok.Audience != targetAudience {
return "", errors.New("Incorrect AUdience to verify IDTOken")
}
log.Printf("Token Verified with Audience")
return validTok.Subject, nil
}
func (s *server) SayHelloStream(in *echo.EchoRequest, stream echo.EchoServer_SayHelloStreamServer) error {
log.Println("Got stream: --> ")
ctx := stream.Context()
var respmdheader = metadata.MD{
"streamheaderkey": []string{"val"},
}
if err := grpc.SendHeader(ctx, respmdheader); err != nil {
log.Fatalf("grpc.SendHeader(%v, %v) = %v, want %v", ctx, respmdheader, err, nil)
}
stream.Send(&echo.EchoReply{Message: "Msg1 " + in.Name})
stream.Send(&echo.EchoReply{Message: "Msg2 " + in.Name})
var respmdfooter = metadata.MD{
"streamtrailerkey": []string{"val"},
}
grpc.SetTrailer(ctx, respmdfooter)
return nil
}
func (s *server) SayHello(ctx context.Context, in *echo.EchoRequest) (*echo.EchoReply, error) {
log.Println("Got rpc: --> ", in.Name)
var respmdheader = metadata.MD{
"rpcheaderkey": []string{"val"},
}
if err := grpc.SendHeader(ctx, respmdheader); err != nil {
log.Fatalf("grpc.SendHeader(%v, %v) = %v, want %v", ctx, respmdheader, err, nil)
}
var respmdfooter = metadata.MD{
"rpctrailerkey": []string{"val"},
}
grpc.SetTrailer(ctx, respmdfooter)
/*
var h, err = os.Hostname()
if err != nil {
log.Fatalf("Unable to get hostname %v", err)
}
*/
h := os.Getenv("K_REVISION")
return &echo.EchoReply{Message: "Hello " + in.Name + " from K_REVISION " + h}, nil
}
func main() {
flag.Parse()
lis, err := net.Listen("tcp", *grpcport)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
sopts := []grpc.ServerOption{grpc.MaxConcurrentStreams(10)}
if *usetls {
ce, err := credentials.NewServerTLSFromFile(*serverCert, *serverKey)
if err != nil {
log.Fatalf("Failed to generate credentials %v", err)
}
log.Printf("Starting gRPC server with TLS")
sopts = append(sopts, grpc.Creds(ce))
}
if *validateToken {
sopts = append(sopts, grpc.UnaryInterceptor(authUnaryInterceptor))
sopts = append(sopts)
}
s := grpc.NewServer(sopts...)
echo.RegisterEchoServerServer(s, &server{})
log.Println("Starting gRPC server on port :8080")
var gracefulStop = make(chan os.Signal)
signal.Notify(gracefulStop, syscall.SIGTERM)
signal.Notify(gracefulStop, syscall.SIGINT)
go func() {
sig := <-gracefulStop
log.Printf("caught sig: %+v", sig)
log.Println("Wait for 1 second to finish processing")
time.Sleep(1 * time.Second)
os.Exit(0)
}()
s.Serve(lis)
}