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backend/remote-state/gcs: Simplify initialization of the GCS client. 

This also implements the (already documented) behavior of checking the
GOOGLE_CREDENTIALS environment variable.
This commit is contained in:
Florian Forster 2017-09-12 12:15:13 +02:00 committed by James Bardin
parent 5205c63bc9
commit 14263223e7
1 changed files with 12 additions and 26 deletions
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38
backend/remote-state/gcs/backend.go
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@ -4,14 +4,13 @@ package gcs
import (
"context"
"fmt"
"io/ioutil"
"os"
"strings"
"cloud.google.com/go/storage"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/schema"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"github.com/hashicorp/terraform/terraform"
"google.golang.org/api/option"
)
@ -83,32 +82,19 @@ func (b *gcsBackend) configure(ctx context.Context) error {
b.defaultStateFile = strings.TrimLeft(data.Get("path").(string), "/")
var tokenSource oauth2.TokenSource
if credentials := data.Get("credentials").(string); credentials != "" {
path := data.Get("credentials").(string)
json, err := ioutil.ReadFile(path)
if err != nil {
return fmt.Errorf("reading %q: %v", path, err)
}
jwtConfig, err := google.JWTConfigFromJSON([]byte(json), storage.ScopeReadWrite)
if err != nil {
return fmt.Errorf("Failed to get Google OAuth2 token: %v", err)
}
tokenSource = jwtConfig.TokenSource(b.storageContext)
} else {
var err error
tokenSource, err = google.DefaultTokenSource(b.storageContext, storage.ScopeReadWrite)
if err != nil {
return fmt.Errorf("Failed to get Google Application Default Credentials: %v", err)
}
opts := []option.ClientOption{
option.WithScopes(storage.ScopeReadWrite),
option.WithUserAgent(terraform.UserAgentString()),
}
if credentialsFile := data.Get("credentials").(string); credentialsFile != "" {
opts = append(opts, option.WithCredentialsFile(credentialsFile))
} else if credentialsFile := os.Getenv("GOOGLE_CREDENTIALS"); credentialsFile != "" {
opts = append(opts, option.WithCredentialsFile(credentialsFile))
}
client, err := storage.NewClient(b.storageContext, option.WithTokenSource(tokenSource))
client, err := storage.NewClient(b.storageContext, opts...)
if err != nil {
return fmt.Errorf("Failed to create Google Storage client: %v", err)
return fmt.Errorf("storage.NewClient() failed: %v", err)
}
b.storageClient = client