Accessing GCE Resources with using the Google API Library

build.sbt

libraryDependencies += "com.google.apis" % "google-api-services-compute" % "v1-rev105-1.21.0"

Main.scala

import com.google.api.client.auth.oauth2.Credential
import com.google.api.client.googleapis.auth.oauth2.{GoogleAuthorizationCodeFlow,GoogleClientSecrets,GoogleCredential}
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport
import com.google.api.client.json.jackson2.JacksonFactory
import com.google.api.services.compute.{Compute,ComputeScopes}
import java.io.{File,InputStreamReader}
import scala.collection.JavaConversions._

object Main extends App {
  final val SERVICE_ACCT = "<<YOUR ACCOUNT>>.apps.googleusercontent.com"
  final val SERVICE_ACCT_KEYFILE = "<< YOUR KEY FILE >>.p12"

  final val PROJECT_NAME = "<< YOUR PROJECT NAME >>"
  final val ZONE_NAME = "us-central1-a"

  val httpTransport = GoogleNetHttpTransport.newTrustedTransport()
  val jsonFactory = JacksonFactory.getDefaultInstance()

  def authorize():Option[GoogleCredential] =
    Option(new GoogleCredential.Builder()
      .setTransport(httpTransport)
      .setJsonFactory(jsonFactory)
      .setServiceAccountId(SERVICE_ACCT)
      .setServiceAccountPrivateKeyFromP12File(new File(
            Main.getClass().getResource("/"+SERVICE_ACCT_KEYFILE).getFile()))
      .setServiceAccountScopes(List(ComputeScopes.COMPUTE_READONLY)).build())

  def printResources(compute:Compute):Unit = {
    Option(compute.instances().list(PROJECT_NAME, ZONE_NAME).execute().getItems()).foreach {
      items =>
        items.foreach(item => println(item))
    }
    Option(compute.disks().list(PROJECT_NAME, ZONE_NAME).execute().getItems()).foreach {
      disks =>
        disks.foreach(println(_))
    }
  }

  authorize().foreach {
    c =>
      val compute = new Compute.Builder(httpTransport, jsonFactory, null)
        .setApplicationName(PROJECT_NAME)
        .setHttpRequestInitializer(c)
        .build()
      printResources(compute)
  }
}