github.com/tkak/terraform@v0.5.4-0.20150712180941-7f738dc27225/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  	computeBeta "google.golang.org/api/compute/v0.beta"
    17  	"google.golang.org/api/compute/v1"
    18  	"google.golang.org/api/container/v1"
    19  	"google.golang.org/api/dns/v1"
    20  	"google.golang.org/api/storage/v1"
    21  )
    22  
    23  // Config is the configuration structure used to instantiate the Google
    24  // provider.
    25  type Config struct {
    26  	AccountFile string
    27  	Project     string
    28  	Region      string
    29  
    30  	clientCompute     *compute.Service
    31  	clientComputeBeta *computeBeta.Service
    32  	clientContainer   *container.Service
    33  	clientDns         *dns.Service
    34  	clientStorage     *storage.Service
    35  }
    36  
    37  func (c *Config) loadAndValidate() error {
    38  	var account accountFile
    39  
    40  	// TODO: validation that it isn't blank
    41  	if c.AccountFile == "" {
    42  		c.AccountFile = os.Getenv("GOOGLE_ACCOUNT_FILE")
    43  	}
    44  	if c.Project == "" {
    45  		c.Project = os.Getenv("GOOGLE_PROJECT")
    46  	}
    47  	if c.Region == "" {
    48  		c.Region = os.Getenv("GOOGLE_REGION")
    49  	}
    50  
    51  	var client *http.Client
    52  
    53  	if c.AccountFile != "" {
    54  		if err := loadJSON(&account, c.AccountFile); err != nil {
    55  			return fmt.Errorf(
    56  				"Error loading account file '%s': %s",
    57  				c.AccountFile,
    58  				err)
    59  		}
    60  
    61  		clientScopes := []string{
    62  			"https://www.googleapis.com/auth/compute",
    63  			"https://www.googleapis.com/auth/cloud-platform",
    64  			"https://www.googleapis.com/auth/ndev.clouddns.readwrite",
    65  			"https://www.googleapis.com/auth/devstorage.full_control",
    66  		}
    67  
    68  		// Get the token for use in our requests
    69  		log.Printf("[INFO] Requesting Google token...")
    70  		log.Printf("[INFO]   -- Email: %s", account.ClientEmail)
    71  		log.Printf("[INFO]   -- Scopes: %s", clientScopes)
    72  		log.Printf("[INFO]   -- Private Key Length: %d", len(account.PrivateKey))
    73  
    74  		conf := jwt.Config{
    75  			Email:      account.ClientEmail,
    76  			PrivateKey: []byte(account.PrivateKey),
    77  			Scopes:     clientScopes,
    78  			TokenURL:   "https://accounts.google.com/o/oauth2/token",
    79  		}
    80  
    81  		// Initiate an http.Client. The following GET request will be
    82  		// authorized and authenticated on the behalf of
    83  		// your service account.
    84  		client = conf.Client(oauth2.NoContext)
    85  
    86  	} else {
    87  		log.Printf("[INFO] Requesting Google token via GCE Service Role...")
    88  		client = &http.Client{
    89  			Transport: &oauth2.Transport{
    90  				// Fetch from Google Compute Engine's metadata server to retrieve
    91  				// an access token for the provided account.
    92  				// If no account is specified, "default" is used.
    93  				Source: google.ComputeTokenSource(""),
    94  			},
    95  		}
    96  
    97  	}
    98  
    99  	// Build UserAgent
   100  	versionString := "0.0.0"
   101  	// TODO(dcunnin): Use Terraform's version code from version.go
   102  	// versionString := main.Version
   103  	// if main.VersionPrerelease != "" {
   104  	// 	versionString = fmt.Sprintf("%s-%s", versionString, main.VersionPrerelease)
   105  	// }
   106  	userAgent := fmt.Sprintf(
   107  		"(%s %s) Terraform/%s", runtime.GOOS, runtime.GOARCH, versionString)
   108  
   109  	var err error
   110  
   111  	log.Printf("[INFO] Instantiating GCE client...")
   112  	c.clientCompute, err = compute.New(client)
   113  	if err != nil {
   114  		return err
   115  	}
   116  	c.clientCompute.UserAgent = userAgent
   117  
   118  	log.Printf("[INFO] Instantiating Beta GCE client...")
   119  	c.clientComputeBeta, err = computeBeta.New(client)
   120  	if err != nil {
   121  		return err
   122  	}
   123  	c.clientComputeBeta.UserAgent = userAgent
   124  
   125  	log.Printf("[INFO] Instantiating GKE client...")
   126  	c.clientContainer, err = container.New(client)
   127  	if err != nil {
   128  		return err
   129  	}
   130  	c.clientContainer.UserAgent = userAgent
   131  
   132  	log.Printf("[INFO] Instantiating Google Cloud DNS client...")
   133  	c.clientDns, err = dns.New(client)
   134  	if err != nil {
   135  		return err
   136  	}
   137  	c.clientDns.UserAgent = userAgent
   138  
   139  	log.Printf("[INFO] Instantiating Google Storage Client...")
   140  	c.clientStorage, err = storage.New(client)
   141  	if err != nil {
   142  		return err
   143  	}
   144  	c.clientStorage.UserAgent = userAgent
   145  
   146  	return nil
   147  }
   148  
   149  // accountFile represents the structure of the account file JSON file.
   150  type accountFile struct {
   151  	PrivateKeyId string `json:"private_key_id"`
   152  	PrivateKey   string `json:"private_key"`
   153  	ClientEmail  string `json:"client_email"`
   154  	ClientId     string `json:"client_id"`
   155  }
   156  
   157  func loadJSON(result interface{}, path string) error {
   158  	f, err := os.Open(path)
   159  	if err != nil {
   160  		return err
   161  	}
   162  	defer f.Close()
   163  
   164  	dec := json.NewDecoder(f)
   165  	return dec.Decode(result)
   166  }