vendor: Update vendoring for the exec client and server implementations

Signed-off-by: Jacek J. Łakis <jacek.lakis@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

vendor/cloud.google.com/go/bigtable/internal/cbtconfig/cbtconfig.go

@@ -0,0 +1,246 @@
+/*
+Copyright 2015 Google Inc. All Rights Reserved.
+
+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 cbtconfig encapsulates common code for reading configuration from .cbtrc and gcloud.
+package cbtconfig
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
+
+	"golang.org/x/oauth2"
+	"google.golang.org/grpc/credentials"
+)
+
+// Config represents a configuration.
+type Config struct {
+	Project, Instance string                           // required
+	Creds             string                           // optional
+	AdminEndpoint     string                           // optional
+	DataEndpoint      string                           // optional
+	CertFile          string                           // optional
+	TokenSource       oauth2.TokenSource               // derived
+	TLSCreds          credentials.TransportCredentials // derived
+}
+
+type RequiredFlags uint
+
+const NoneRequired RequiredFlags = 0
+const (
+	ProjectRequired RequiredFlags = 1 << iota
+	InstanceRequired
+)
+const ProjectAndInstanceRequired RequiredFlags = ProjectRequired | InstanceRequired
+
+// RegisterFlags registers a set of standard flags for this config.
+// It should be called before flag.Parse.
+func (c *Config) RegisterFlags() {
+	flag.StringVar(&c.Project, "project", c.Project, "project ID, if unset uses gcloud configured project")
+	flag.StringVar(&c.Instance, "instance", c.Instance, "Cloud Bigtable instance")
+	flag.StringVar(&c.Creds, "creds", c.Creds, "if set, use application credentials in this file")
+	flag.StringVar(&c.AdminEndpoint, "admin-endpoint", c.AdminEndpoint, "Override the admin api endpoint")
+	flag.StringVar(&c.DataEndpoint, "data-endpoint", c.DataEndpoint, "Override the data api endpoint")
+	flag.StringVar(&c.CertFile, "cert-file", c.CertFile, "Override the TLS certificates file")
+}
+
+// CheckFlags checks that the required config values are set.
+func (c *Config) CheckFlags(required RequiredFlags) error {
+	var missing []string
+	if c.CertFile != "" {
+		b, err := ioutil.ReadFile(c.CertFile)
+		if err != nil {
+			return fmt.Errorf("Failed to load certificates from %s: %v", c.CertFile, err)
+		}
+
+		cp := x509.NewCertPool()
+		if !cp.AppendCertsFromPEM(b) {
+			return fmt.Errorf("Failed to append certificates from %s", c.CertFile)
+		}
+
+		c.TLSCreds = credentials.NewTLS(&tls.Config{RootCAs: cp})
+	}
+	if required != NoneRequired {
+		c.SetFromGcloud()
+	}
+	if required&ProjectRequired != 0 && c.Project == "" {
+		missing = append(missing, "-project")
+	}
+	if required&InstanceRequired != 0 && c.Instance == "" {
+		missing = append(missing, "-instance")
+	}
+	if len(missing) > 0 {
+		return fmt.Errorf("Missing %s", strings.Join(missing, " and "))
+	}
+	return nil
+}
+
+// Filename returns the filename consulted for standard configuration.
+func Filename() string {
+	// TODO(dsymonds): Might need tweaking for Windows.
+	return filepath.Join(os.Getenv("HOME"), ".cbtrc")
+}
+
+// Load loads a .cbtrc file.
+// If the file is not present, an empty config is returned.
+func Load() (*Config, error) {
+	filename := Filename()
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		// silent fail if the file isn't there
+		if os.IsNotExist(err) {
+			return &Config{}, nil
+		}
+		return nil, fmt.Errorf("Reading %s: %v", filename, err)
+	}
+	c := new(Config)
+	s := bufio.NewScanner(bytes.NewReader(data))
+	for s.Scan() {
+		line := s.Text()
+		i := strings.Index(line, "=")
+		if i < 0 {
+			return nil, fmt.Errorf("Bad line in %s: %q", filename, line)
+		}
+		key, val := strings.TrimSpace(line[:i]), strings.TrimSpace(line[i+1:])
+		switch key {
+		default:
+			return nil, fmt.Errorf("Unknown key in %s: %q", filename, key)
+		case "project":
+			c.Project = val
+		case "instance":
+			c.Instance = val
+		case "creds":
+			c.Creds = val
+		case "admin-endpoint":
+			c.AdminEndpoint = val
+		case "data-endpoint":
+			c.DataEndpoint = val
+		}
+
+	}
+	return c, s.Err()
+}
+
+type GcloudCredential struct {
+	AccessToken string    `json:"access_token"`
+	Expiry      time.Time `json:"token_expiry"`
+}
+
+func (cred *GcloudCredential) Token() *oauth2.Token {
+	return &oauth2.Token{AccessToken: cred.AccessToken, TokenType: "Bearer", Expiry: cred.Expiry}
+}
+
+type GcloudConfig struct {
+	Configuration struct {
+		Properties struct {
+			Core struct {
+				Project string `json:"project"`
+			} `json:"core"`
+		} `json:"properties"`
+	} `json:"configuration"`
+	Credential GcloudCredential `json:"credential"`
+}
+
+type GcloudCmdTokenSource struct {
+	Command string
+	Args    []string
+}
+
+// Token implements the oauth2.TokenSource interface
+func (g *GcloudCmdTokenSource) Token() (*oauth2.Token, error) {
+	gcloudConfig, err := LoadGcloudConfig(g.Command, g.Args)
+	if err != nil {
+		return nil, err
+	}
+	return gcloudConfig.Credential.Token(), nil
+}
+
+// LoadGcloudConfig retrieves the gcloud configuration values we need use via the
+// 'config-helper' command
+func LoadGcloudConfig(gcloudCmd string, gcloudCmdArgs []string) (*GcloudConfig, error) {
+	out, err := exec.Command(gcloudCmd, gcloudCmdArgs...).Output()
+	if err != nil {
+		return nil, fmt.Errorf("Could not retrieve gcloud configuration")
+	}
+
+	var gcloudConfig GcloudConfig
+	if err := json.Unmarshal(out, &gcloudConfig); err != nil {
+		return nil, fmt.Errorf("Could not parse gcloud configuration")
+	}
+
+	return &gcloudConfig, nil
+}
+
+// SetFromGcloud retrieves and sets any missing config values from the gcloud
+// configuration if possible possible
+func (c *Config) SetFromGcloud() error {
+
+	if c.Creds == "" {
+		c.Creds = os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
+		if c.Creds == "" {
+			log.Printf("-creds flag unset, will use gcloud credential")
+		}
+	} else {
+		os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", c.Creds)
+	}
+
+	if c.Project == "" {
+		log.Printf("-project flag unset, will use gcloud active project")
+	}
+
+	if c.Creds != "" && c.Project != "" {
+		return nil
+	}
+
+	gcloudCmd := "gcloud"
+	if runtime.GOOS == "windows" {
+		gcloudCmd = gcloudCmd + ".cmd"
+	}
+
+	gcloudCmdArgs := []string{"config", "config-helper",
+		"--format=json(configuration.properties.core.project,credential)"}
+
+	gcloudConfig, err := LoadGcloudConfig(gcloudCmd, gcloudCmdArgs)
+	if err != nil {
+		return err
+	}
+
+	if c.Project == "" && gcloudConfig.Configuration.Properties.Core.Project != "" {
+		log.Printf("gcloud active project is \"%s\"",
+			gcloudConfig.Configuration.Properties.Core.Project)
+		c.Project = gcloudConfig.Configuration.Properties.Core.Project
+	}
+
+	if c.Creds == "" {
+		c.TokenSource = oauth2.ReuseTokenSource(
+			gcloudConfig.Credential.Token(),
+			&GcloudCmdTokenSource{Command: gcloudCmd, Args: gcloudCmdArgs})
+	}
+
+	return nil
+}