OAuth2 authorization from Java/Scala using google gdata client API

Question

How would you perform the same flow as the Google .Net sample at subsection \"Performing OAuth 2.0\", using an equivalent Java api?

That .Net sample I am trying to mimic

Answer 1

Looks like http://soatutorials.blogspot.co.at/2013/08/google-spreadsheet-api-connecting-with.html has it for Java.

Scala solution code, courtesy of http://javatoscala.com/ :

package com.articlio.googleApi
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import com.google.gdata.client.GoogleService;
import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
import com.google.gdata.client.authn.oauth.OAuthException;
import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthRsaSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthSigner;
import com.google.gdata.client.spreadsheet.SpreadsheetService;
import com.google.gdata.data.spreadsheet.SpreadsheetFeed
import com.google.gdata.data.BaseEntry;
import com.google.gdata.data.BaseFeed;
import com.google.gdata.data.Feed;
import com.google.gdata.util.AuthenticationException;
import com.google.gdata.util.ServiceException;

//remove if not needed
import scala.collection.JavaConversions._

object OAuth2Sample {

  def loginOAuth2(clientID: String, clientSecret: String) {
    val SCOPES = "https://docs.google.com/feeds https://spreadsheets.google.com/feeds"
    val oauthParameters = new GoogleOAuthParameters
    oauthParameters.setOAuthConsumerKey(clientID) //
    var signer: OAuthSigner = null
    oauthParameters.setOAuthConsumerSecret(clientSecret) //
    signer = new OAuthHmacSha1Signer()
    val oauthHelper = new GoogleOAuthHelper(signer)
    oauthParameters.setScope(SCOPES)
    try {
      oauthHelper.getUnauthorizedRequestToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val requestUrl = oauthHelper.createUserAuthorizationUrl(oauthParameters)
    println(requestUrl)
    println("Please visit the URL above to authorize your OAuth " + 
      "request token.  Once that is complete, press any key to " + 
      "continue...")
    try {
      System.in.read()
    } catch {
      case e: IOException => e.printStackTrace()
    }
    var token: String = null
    try {
      token = oauthHelper.getAccessToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Access Token: " + token)
    println()
    var feedUrl: URL = null
    try {
      feedUrl = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full")
    } catch {
      case e: MalformedURLException => e.printStackTrace()
    }
    println("Sending request to " + feedUrl.toString)
    println()
    val googleService = new SpreadsheetService("oauth-sample-app")
    try {
      googleService.setOAuthCredentials(oauthParameters, signer)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val feed = googleService.getFeed(feedUrl, classOf[SpreadsheetFeed])
    val spreadsheets = feed.getEntries
    println("Response Data:")
    println("=====================================================")
    if (spreadsheets != null) {
      for (spreadsheet <- spreadsheets) {
        println(spreadsheet.getTitle.getPlainText)
      }
    }
    println("=====================================================")
    println()
    println("Revoking OAuth Token...")
    try {
      oauthHelper.revokeToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Token revoked...")
  }
}

For scala however, you currently also need to apply this...