github.com/arvindram03/terraform@v0.3.7-0.20150212015210-408f838db36d/builtin/providers/google/config.go (about)

     1  package google
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"log"
     7  	"net/http"
     8  	"os"
     9  
    10  	"code.google.com/p/goauth2/oauth"
    11  	"code.google.com/p/goauth2/oauth/jwt"
    12  	"code.google.com/p/google-api-go-client/compute/v1"
    13  )
    14  
    15  const clientScopes string = "https://www.googleapis.com/auth/compute"
    16  
    17  // Config is the configuration structure used to instantiate the Google
    18  // provider.
    19  type Config struct {
    20  	AccountFile string
    21  	Project     string
    22  	Region      string
    23  
    24  	clientCompute *compute.Service
    25  }
    26  
    27  func (c *Config) loadAndValidate() error {
    28  	var account accountFile
    29  
    30  	// TODO: validation that it isn't blank
    31  	if c.AccountFile == "" {
    32  		c.AccountFile = os.Getenv("GOOGLE_ACCOUNT_FILE")
    33  	}
    34  	if c.Project == "" {
    35  		c.Project = os.Getenv("GOOGLE_PROJECT")
    36  	}
    37  	if c.Region == "" {
    38  		c.Region = os.Getenv("GOOGLE_REGION")
    39  	}
    40  
    41  	if err := loadJSON(&account, c.AccountFile); err != nil {
    42  		return fmt.Errorf(
    43  			"Error loading account file '%s': %s",
    44  			c.AccountFile,
    45  			err)
    46  	}
    47  
    48  	// Get the token for use in our requests
    49  	log.Printf("[INFO] Requesting Google token...")
    50  	log.Printf("[INFO]   -- Email: %s", account.ClientEmail)
    51  	log.Printf("[INFO]   -- Scopes: %s", clientScopes)
    52  	log.Printf("[INFO]   -- Private Key Length: %d", len(account.PrivateKey))
    53  	jwtTok := jwt.NewToken(
    54  		account.ClientEmail,
    55  		clientScopes,
    56  		[]byte(account.PrivateKey))
    57  	token, err := jwtTok.Assert(new(http.Client))
    58  	if err != nil {
    59  		return fmt.Errorf("Error retrieving auth token: %s", err)
    60  	}
    61  
    62  	// Instantiate the transport to communicate to Google
    63  	transport := &oauth.Transport{
    64  		Config: &oauth.Config{
    65  			ClientId: account.ClientId,
    66  			Scope:    clientScopes,
    67  		},
    68  		Token: token,
    69  	}
    70  
    71  	log.Printf("[INFO] Instantiating GCE client...")
    72  	c.clientCompute, err = compute.New(transport.Client())
    73  	if err != nil {
    74  		return err
    75  	}
    76  
    77  	return nil
    78  }
    79  
    80  // accountFile represents the structure of the account file JSON file.
    81  type accountFile struct {
    82  	PrivateKeyId string `json:"private_key_id"`
    83  	PrivateKey   string `json:"private_key"`
    84  	ClientEmail  string `json:"client_email"`
    85  	ClientId     string `json:"client_id"`
    86  }
    87  
    88  func loadJSON(result interface{}, path string) error {
    89  	f, err := os.Open(path)
    90  	if err != nil {
    91  		return err
    92  	}
    93  	defer f.Close()
    94  
    95  	dec := json.NewDecoder(f)
    96  	return dec.Decode(result)
    97  }