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function getTumblrOAuthConfig_(){
  // values available once an app is registered here: http://www.tumblr.com/oauth/apps
  // registered app callback URL should be: https://script.google.com/macros
  var consumer_key = "<OAuth Consumer Key>";
  var consumer_secret = "<Secret Key>";
  
  var oAuthConfig = UrlFetchApp.addOAuthService("Tumblr");

  oAuthConfig.setAccessTokenUrl('http://www.tumblr.com/oauth/access_token');
  oAuthConfig.setAuthorizationUrl('http://www.tumblr.com/oauth/authorize');
  oAuthConfig.setRequestTokenUrl('http://www.tumblr.com/oauth/request_token');
  oAuthConfig.setConsumerKey(consumer_key);
  oAuthConfig.setConsumerSecret(consumer_secret);

  return oAuthConfig;
}

function startTumblrAuthorization(){
  var oAuthConfig = getTumblrOAuthConfig_();
  var url = "http://api.tumblr.com/v2/user/info";
  var options = {
    "method": "GET",
    "oAuthServiceName": "Tumblr",
    "oAuthUseToken": "always"
  };
  
  var result = UrlFetchApp.fetch(url, options);
  
  // If authorization is successful, on the next run, data are viewable in the "View > Logs…" menu
  Logger.log(result.getContentText());
  
  return oAuthConfig;
}