gcs_list_bucket.go

package main

import (
	"strings"

	"fmt"
	"io/ioutil"
	"net/http"
	"net/url"

	"code.google.com/p/goauth2/oauth/jwt"
	"code.google.com/p/google-api-go-client/googleapi"
	"code.google.com/p/google-api-go-client/storage/v1beta2"
)

func main() {
	iss := ".....@developer.gserviceaccount.com"
	scope := "https://www.googleapis.com/auth/devstorage.read_only"

	pemKeyBytes, _ := ioutil.ReadFile("pkey.pem")

	t := jwt.NewToken(iss, scope, pemKeyBytes)

	transport, transError := jwt.NewTransport(t)

	if transError != nil {
		panic(transError)
	}

	client := transport.Client()
	service, err := storage.New(client)

	if err != nil {
		panic(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.Println(item.Id)
		}
		fmt.Println()
	} else {
		fmt.Println(service, "Buckets.List failed: %v", err)
	}

	bucket := "aabucket"

	if res, err := service.Objects.List(bucket).Do(); err == nil {
		fmt.Println("Objects:")
		for _, item := range res.Items {
			fmt.Println(item.Name)
		}
		fmt.Println()
	} else {
		fmt.Println(service, "Objects.List failed: %v", err)
	}

	filename := "filename"

	if obj, err := service.Objects.Get(bucket, filename).Do(); err == nil {
		fmt.Println("Object:")
		fmt.Println(obj.Name == filename)

		urltemplate := "https://www.googleapis.com/storage/v1beta2/b/{bucket}/o/{object}?alt=media"

		req, _ := http.NewRequest("GET", urltemplate, nil)
		fmt.Println(req.URL)
		req.URL.Path = strings.Replace(req.URL.Path, "{bucket}", url.QueryEscape(bucket), 1)
		req.URL.Path = strings.Replace(req.URL.Path, "{object}", url.QueryEscape(filename), 1)
		googleapi.SetOpaque(req.URL)
		fmt.Println(req.URL)

		resp, getErr := client.Do(req)

		if getErr != nil {
			panic(getErr)
		}

		bodyBytes, readErr := ioutil.ReadAll(resp.Body)

		if readErr != nil {
			panic(readErr)
		}

		fmt.Println(string(bodyBytes))

	} else {
		fmt.Println(service, "Objects.Get failed: %v", err)
	}

}