vendor update for CSI 0.3.0

vendor/google.golang.org/grpc/credentials/alts/utils.go

@@ -0,0 +1,136 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package alts
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"strings"
+	"time"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc/peer"
+)
+
+const (
+	linuxProductNameFile     = "/sys/class/dmi/id/product_name"
+	windowsCheckCommand      = "powershell.exe"
+	windowsCheckCommandArgs  = "Get-WmiObject -Class Win32_BIOS"
+	powershellOutputFilter   = "Manufacturer"
+	windowsManufacturerRegex = ":(.*)"
+	windowsCheckTimeout      = 30 * time.Second
+)
+
+type platformError string
+
+func (k platformError) Error() string {
+	return fmt.Sprintf("%s is not supported", string(k))
+}
+
+var (
+	// The following two variables will be reassigned in tests.
+	runningOS          = runtime.GOOS
+	manufacturerReader = func() (io.Reader, error) {
+		switch runningOS {
+		case "linux":
+			return os.Open(linuxProductNameFile)
+		case "windows":
+			cmd := exec.Command(windowsCheckCommand, windowsCheckCommandArgs)
+			out, err := cmd.Output()
+			if err != nil {
+				return nil, err
+			}
+
+			for _, line := range strings.Split(strings.TrimSuffix(string(out), "\n"), "\n") {
+				if strings.HasPrefix(line, powershellOutputFilter) {
+					re := regexp.MustCompile(windowsManufacturerRegex)
+					name := re.FindString(line)
+					name = strings.TrimLeft(name, ":")
+					return strings.NewReader(name), nil
+				}
+			}
+
+			return nil, errors.New("cannot determine the machine's manufacturer")
+		default:
+			return nil, platformError(runningOS)
+		}
+	}
+	vmOnGCP bool
+)
+
+// isRunningOnGCP checks whether the local system, without doing a network request is
+// running on GCP.
+func isRunningOnGCP() bool {
+	manufacturer, err := readManufacturer()
+	if err != nil {
+		log.Fatalf("failure to read manufacturer information: %v", err)
+	}
+	name := string(manufacturer)
+	switch runningOS {
+	case "linux":
+		name = strings.TrimSpace(name)
+		return name == "Google" || name == "Google Compute Engine"
+	case "windows":
+		name = strings.Replace(name, " ", "", -1)
+		name = strings.Replace(name, "\n", "", -1)
+		name = strings.Replace(name, "\r", "", -1)
+		return name == "Google"
+	default:
+		log.Fatal(platformError(runningOS))
+	}
+	return false
+}
+
+func readManufacturer() ([]byte, error) {
+	reader, err := manufacturerReader()
+	if err != nil {
+		return nil, err
+	}
+	if reader == nil {
+		return nil, errors.New("got nil reader")
+	}
+	manufacturer, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return nil, fmt.Errorf("failed reading %v: %v", linuxProductNameFile, err)
+	}
+	return manufacturer, nil
+}
+
+// AuthInfoFromContext extracts the alts.AuthInfo object from the given context,
+// if it exists. This API should be used by gRPC server RPC handlers to get
+// information about the communicating peer. For client-side, use grpc.Peer()
+// CallOption.
+func AuthInfoFromContext(ctx context.Context) (AuthInfo, error) {
+	peer, ok := peer.FromContext(ctx)
+	if !ok {
+		return nil, errors.New("no Peer found in Context")
+	}
+	altsAuthInfo, ok := peer.AuthInfo.(AuthInfo)
+	if !ok {
+		return nil, errors.New("no alts.AuthInfo found in Context")
+	}
+	return altsAuthInfo, nil
+}