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