example google.DefaultClient()

gcs_sample.go

package gcs_sample

import (
	"net/http"
	"fmt"

	"google.golang.org/appengine"
	"google.golang.org/appengine/log"

	"golang.org/x/oauth2/google"
	storage "google.golang.org/api/storage/v1"

)

func init() {
	http.HandleFunc("/", handler)
}

func handler(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)

	projectID := "cp300demo1"
	bucketName := "hoge"

	client, err := google.DefaultClient(c, storage.DevstorageFullControlScope)
	if err != nil {
		log.Errorf(c, "Unable to get default client: %v", err)
	}
	service, err := storage.New(client)
	if err != nil {
		log.Errorf(c, "Unable to create storage service: %v", err)
	}

	// If the bucket already exists and the user has access, warn the user, but don't try to create it.
	if _, err := service.Buckets.Get(bucketName).Do(); err == nil {
		fmt.Printf("Bucket %s already exists - skipping buckets.insert call.", bucketName)
	} else {
		// Create a bucket.
		if res, err := service.Buckets.Insert(projectID, &storage.Bucket{Name: bucketName}).Do(); err == nil {
			fmt.Printf("Created bucket %v at location %v\n\n", res.Name, res.SelfLink)
		} else {
			log.Errorf(c, "Failed creating bucket %s: %v", bucketName, err)
		}
	}

	// List all buckets in a project.
	if res, err := service.Buckets.List(projectID).Do(); err == nil {
		fmt.Println("Buckets:")
		for _, item := range res.Items {
			fmt.Fprintf(w, "%s\n", item.Id)
		}
		fmt.Println()
	} else {
		log.Errorf(c, "Buckets.List failed: %v", err)
	}
}