# File lib/fog/hp.rb, line 87
    def self.authenticate_v2(options, connection_options = {})
      hp_auth_uri = options[:hp_auth_uri] || "https://region-a.geo-1.identity.hpcloudsvc.com:35357/v2.0/tokens"
      # append /tokens if missing from auth uri
      @hp_auth_uri = hp_auth_uri.include?('tokens')? hp_auth_uri : hp_auth_uri + "tokens"
      endpoint = URI.parse(@hp_auth_uri)
      @scheme = endpoint.scheme || "https"
      @host = endpoint.host || "region-a.geo-1.identity.hpcloudsvc.com"
      @port = endpoint.port.to_s || "35357"
      if (endpoint.path)
        @auth_path = endpoint.path.slice(1, endpoint.path.length)  # remove the leading slash
      else
        @auth_path = "v2.0/tokens"
      end
      service_url = "#{@scheme}://#{@host}:#{@port}"
      connection = Fog::Connection.new(service_url, false, connection_options)

      ### Implement HP Control Services Authentication services ###
      # Get the style of auth credentials passed, defaults to access/secret key style
      @hp_use_upass_auth_style = options[:hp_use_upass_auth_style] || false
      @hp_account_id = options[:hp_account_id]
      @hp_secret_key = options[:hp_secret_key]
      @hp_tenant_id  = options[:hp_tenant_id]
      @hp_service_type  = options[:hp_service_type]
      @hp_avl_zone   = options[:hp_avl_zone] || :az1

      ### Decide which auth style to use
      unless (@hp_use_upass_auth_style)
        # If Access Key style credentials are provided, use that
        request_body = {
            'auth' => {
                'apiAccessKeyCredentials' => {
                    'accessKey' => "#{@hp_account_id}",
                    'secretKey' => "#{@hp_secret_key}"
                }
            }
        }
      else
        # Otherwise use the Username/Password style
        request_body = {
            'auth' => {
                'passwordCredentials' => {
                    'username' => "#{@hp_account_id}",
                    'password' => "#{@hp_secret_key}"
                }
            }
        }
      end
      # add tenant_id if specified
      request_body['auth']['tenantId'] = "#{@hp_tenant_id}" if @hp_tenant_id

      ### Make the call to CS to get auth token and service catalog
      response = connection.request(
        {
          :expects => 200,
          :headers => {
              'Content-Type' => 'application/json'
          },
          :host => @host,
          :port => @port,
          :method => 'POST',
          :body => Fog::JSON.encode(request_body),
          :path => @auth_path
        }
      )

      body = Fog::JSON.decode(response.body)

      ### fish out auth_token and endpoint for the service
      auth_token = body['access']['token']['id']
      endpoint_url = get_endpoint_from_catalog(body['access']['serviceCatalog'], @hp_service_type, @hp_avl_zone)
      # If service is Storage, then get the CDN endpoint as well
      if @hp_service_type == "object-store"
        cdn_endpoint_url = get_endpoint_from_catalog(body['access']['serviceCatalog'], "hpext:cdn", @hp_avl_zone)
      end

      return {
        :auth_token => auth_token,
        :endpoint_url => endpoint_url,
        :cdn_endpoint_url => cdn_endpoint_url
      }

    end