github.com/bendemaree/terraform@v0.5.4-0.20150613200311-f50d97d6eee6/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  	"runtime"
    10  
    11  	// TODO(dcunnin): Use version code from version.go
    12  	// "github.com/hashicorp/terraform"
    13  	"golang.org/x/oauth2"
    14  	"golang.org/x/oauth2/google"
    15  	"golang.org/x/oauth2/jwt"
    16  	"google.golang.org/api/compute/v1"
    17  	computeBeta "google.golang.org/api/compute/v0.beta"
    18  	"google.golang.org/api/dns/v1"
    19  	"google.golang.org/api/storage/v1"
    20  )
    21  
    22  // Config is the configuration structure used to instantiate the Google
    23  // provider.
    24  type Config struct {
    25  	AccountFile string
    26  	Project     string
    27  	Region      string
    28  
    29  	clientCompute *compute.Service
    30  	clientComputeBeta *computeBeta.Service
    31  	clientDns     *dns.Service
    32  	clientStorage *storage.Service
    33  }
    34  
    35  func (c *Config) loadAndValidate() error {
    36  	var account accountFile
    37  
    38  	// TODO: validation that it isn't blank
    39  	if c.AccountFile == "" {
    40  		c.AccountFile = os.Getenv("GOOGLE_ACCOUNT_FILE")
    41  	}
    42  	if c.Project == "" {
    43  		c.Project = os.Getenv("GOOGLE_PROJECT")
    44  	}
    45  	if c.Region == "" {
    46  		c.Region = os.Getenv("GOOGLE_REGION")
    47  	}
    48  
    49  	var client *http.Client
    50  
    51  	if c.AccountFile != "" {
    52  		if err := loadJSON(&account, c.AccountFile); err != nil {
    53  			return fmt.Errorf(
    54  				"Error loading account file '%s': %s",
    55  				c.AccountFile,
    56  				err)
    57  		}
    58  
    59  		clientScopes := []string{
    60  			"https://www.googleapis.com/auth/compute",
    61  			"https://www.googleapis.com/auth/ndev.clouddns.readwrite",
    62  			"https://www.googleapis.com/auth/devstorage.full_control",
    63  		}
    64  
    65  		// Get the token for use in our requests
    66  		log.Printf("[INFO] Requesting Google token...")
    67  		log.Printf("[INFO]   -- Email: %s", account.ClientEmail)
    68  		log.Printf("[INFO]   -- Scopes: %s", clientScopes)
    69  		log.Printf("[INFO]   -- Private Key Length: %d", len(account.PrivateKey))
    70  
    71  		conf := jwt.Config{
    72  			Email:      account.ClientEmail,
    73  			PrivateKey: []byte(account.PrivateKey),
    74  			Scopes:     clientScopes,
    75  			TokenURL:   "https://accounts.google.com/o/oauth2/token",
    76  		}
    77  
    78  		// Initiate an http.Client. The following GET request will be
    79  		// authorized and authenticated on the behalf of
    80  		// your service account.
    81  		client = conf.Client(oauth2.NoContext)
    82  
    83  	} else {
    84  		log.Printf("[INFO] Requesting Google token via GCE Service Role...")
    85  		client = &http.Client{
    86  			Transport: &oauth2.Transport{
    87  				// Fetch from Google Compute Engine's metadata server to retrieve
    88  				// an access token for the provided account.
    89  				// If no account is specified, "default" is used.
    90  				Source: google.ComputeTokenSource(""),
    91  			},
    92  		}
    93  
    94  	}
    95  
    96  	// Build UserAgent
    97  	versionString := "0.0.0"
    98  	// TODO(dcunnin): Use Terraform's version code from version.go
    99  	// versionString := main.Version
   100  	// if main.VersionPrerelease != "" {
   101  	// 	versionString = fmt.Sprintf("%s-%s", versionString, main.VersionPrerelease)
   102  	// }
   103  	userAgent := fmt.Sprintf(
   104  		"(%s %s) Terraform/%s", runtime.GOOS, runtime.GOARCH, versionString)
   105  
   106  	var err error
   107  
   108  	log.Printf("[INFO] Instantiating GCE client...")
   109  	c.clientCompute, err = compute.New(client)
   110  	if err != nil {
   111  		return err
   112  	}
   113  	c.clientCompute.UserAgent = userAgent
   114  
   115  	log.Printf("[INFO] Instantiating Beta GCE client...")
   116  	c.clientComputeBeta, err = computeBeta.New(client)
   117  	if err != nil {
   118  		return err
   119  	}
   120  	c.clientComputeBeta.UserAgent = userAgent
   121  
   122  	log.Printf("[INFO] Instantiating Google Cloud DNS client...")
   123  	c.clientDns, err = dns.New(client)
   124  	if err != nil {
   125  		return err
   126  	}
   127  	c.clientDns.UserAgent = userAgent
   128  
   129  	log.Printf("[INFO] Instantiating Google Storage Client...")
   130  	c.clientStorage, err = storage.New(client)
   131  	if err != nil {
   132  		return err
   133  	}
   134  	c.clientStorage.UserAgent = userAgent
   135  
   136  	return nil
   137  }
   138  
   139  // accountFile represents the structure of the account file JSON file.
   140  type accountFile struct {
   141  	PrivateKeyId string `json:"private_key_id"`
   142  	PrivateKey   string `json:"private_key"`
   143  	ClientEmail  string `json:"client_email"`
   144  	ClientId     string `json:"client_id"`
   145  }
   146  
   147  func loadJSON(result interface{}, path string) error {
   148  	f, err := os.Open(path)
   149  	if err != nil {
   150  		return err
   151  	}
   152  	defer f.Close()
   153  
   154  	dec := json.NewDecoder(f)
   155  	return dec.Decode(result)
   156  }