terraform/builtin/providers/google/config.go

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package google
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"code.google.com/p/goauth2/oauth"
"code.google.com/p/goauth2/oauth/jwt"
"code.google.com/p/google-api-go-client/compute/v1"
)
const clientScopes string = "https://www.googleapis.com/auth/compute"
// Config is the configuration structure used to instantiate the Google
// provider.
type Config struct {
AccountFile string
ClientSecretsFile string
Project string
Region string
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clientCompute *compute.Service
}
func (c *Config) loadAndValidate() error {
var account accountFile
var secrets clientSecretsFile
// TODO: validation that it isn't blank
if c.AccountFile == "" {
c.AccountFile = os.Getenv("GOOGLE_ACCOUNT_FILE")
}
if c.ClientSecretsFile == "" {
c.ClientSecretsFile = os.Getenv("GOOGLE_CLIENT_FILE")
}
if c.Project == "" {
c.Project = os.Getenv("GOOGLE_PROJECT")
}
if c.Region == "" {
c.Region = os.Getenv("GOOGLE_REGION")
}
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if err := loadJSON(&account, c.AccountFile); err != nil {
return fmt.Errorf(
"Error loading account file '%s': %s",
c.AccountFile,
err)
}
if err := loadJSON(&secrets, c.ClientSecretsFile); err != nil {
return fmt.Errorf(
"Error loading client secrets file '%s': %s",
c.ClientSecretsFile,
err)
}
// Get the token for use in our requests
log.Printf("[INFO] Requesting Google token...")
log.Printf("[INFO] -- Email: %s", account.ClientEmail)
log.Printf("[INFO] -- Scopes: %s", clientScopes)
log.Printf("[INFO] -- Private Key Length: %d", len(account.PrivateKey))
log.Printf("[INFO] -- Token URL: %s", secrets.Web.TokenURI)
jwtTok := jwt.NewToken(
account.ClientEmail,
clientScopes,
[]byte(account.PrivateKey))
jwtTok.ClaimSet.Aud = secrets.Web.TokenURI
token, err := jwtTok.Assert(new(http.Client))
if err != nil {
return fmt.Errorf("Error retrieving auth token: %s", err)
}
// Instantiate the transport to communicate to Google
transport := &oauth.Transport{
Config: &oauth.Config{
ClientId: account.ClientId,
Scope: clientScopes,
TokenURL: secrets.Web.TokenURI,
AuthURL: secrets.Web.AuthURI,
},
Token: token,
}
log.Printf("[INFO] Instantiating GCE client...")
c.clientCompute, err = compute.New(transport.Client())
if err != nil {
return err
}
return nil
}
// accountFile represents the structure of the account file JSON file.
type accountFile struct {
PrivateKeyId string `json:"private_key_id"`
PrivateKey string `json:"private_key"`
ClientEmail string `json:"client_email"`
ClientId string `json:"client_id"`
}
// clientSecretsFile represents the structure of the client secrets JSON file.
type clientSecretsFile struct {
Web struct {
AuthURI string `json:"auth_uri"`
ClientEmail string `json:"client_email"`
ClientId string `json:"client_id"`
TokenURI string `json:"token_uri"`
}
}
func loadJSON(result interface{}, path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
dec := json.NewDecoder(f)
return dec.Decode(result)
}