Call sheets API v4 with a service account

build.sbt

name := "sheettest"

version := "1.0.0"

scalaVersion := "2.11.8"

libraryDependencies ++= Seq(
  ("com.google.api-client" % "google-api-client" % "1.22.0").
    exclude("com.google.guava", "guava-jdk5"),
  "com.google.oauth-client" % "google-oauth-client-jetty" % "1.22.0",
  "com.google.apis" % "google-api-services-sheets" % "v4-rev18-1.22.0",
  "org.scala-lang" % "scala-library" % scalaVersion.value % "compile"
)

Main.scala

import java.io.{File, InputStream}
import java.net.URL

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport
import com.google.api.client.http.javanet.NetHttpTransport
import com.google.api.client.json.jackson2.JacksonFactory
import com.google.api.services.sheets.v4.model._
import com.google.api.services.sheets.v4.{Sheets, SheetsScopes}

import scala.collection.JavaConversions._
import scala.collection.JavaConverters._

object App {
  private val SPREADSHEET_URL = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full")
  private val scopes = List(SheetsScopes.SPREADSHEETS)
  private val HTTP_TRANSPORT: NetHttpTransport = GoogleNetHttpTransport.newTrustedTransport()
  private val JSON_FACTORY: JacksonFactory = JacksonFactory.getDefaultInstance()

  def authorize(stream: InputStream): GoogleCredential = {
    val credential = GoogleCredential.fromStream(stream).createScoped(scopes)

    credential.refreshToken()
    credential
  }

  def main(args: Array[String]) = {
    val credentialStream = getClass.getResourceAsStream("credential.json")
    val spreadSheetId = "1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms"

    val credential = authorize(credentialStream)
    val service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
      .setApplicationName("SHEET_TEST")
      .build()

    val sheet = service.spreadsheets().get(spreadSheetId).execute()
    println(s"Title: ${sheet.getProperties.getTitle}")
  }
}