set a .csv file extension when using kaltura bulk api

kaltura validates that the file upload has a .csv extension
and canvas was sending just "csvFileData" as the file name

Test Plan:
 * Add a media file into the files area of the course
 * It should get processed by kaltura (show the player after a minute)

closes CNVS-3889

Change-Id: I08dc992bc7f8a50eea6b17eaff92a116e70cf99d
Reviewed-on: https://gerrit.instructure.com/17735
Reviewed-by: Brian Palmer <brianp@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Brian Palmer <brianp@instructure.com>

lib/kaltura.rb

@@ -0,0 +1,5 @@
+module Kaltura
+end
+
+require_dependency 'kaltura/kaltura_client_v3'
+require_dependency 'kaltura/kaltura_string_io'

lib/kaltura/kaltura_client_v3.rb

@@ -237,7 +237,7 @@ module Kaltura
       result = postRequest(:bulkUpload, :add,
                            :ks => @ks,
                            :conversionProfileId => -1,
-                           :csvFileData => StringIO.new(csv)
+                           :csvFileData => KalturaStringIO.new(csv, "bulk_data.csv")
                        )
       parseBulkUpload(result)
       # results will have entryId values -- do we get them right away?

lib/kaltura/kaltura_string_io.rb

@@ -0,0 +1,10 @@
+module Kaltura
+  class KalturaStringIO < StringIO
+    attr_accessor :path
+
+    def initialize(string="", file_path=nil)
+      super(string)
+      self.path = file_path
+    end
+  end
+end

spec/lib/kaltura/kaltura_client_v3_spec.rb

@@ -16,7 +16,7 @@
 # with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 
-require File.expand_path(File.dirname(__FILE__) + '/../spec_helper.rb')
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper.rb')
 
 describe "Kaltura::ClientV3" do
   before(:each) do

spec/lib/kaltura/kaltura_string_io_spec.rb

@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2011 Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper.rb')
+
+describe Kaltura::KalturaStringIO do
+  it "should set path" do
+    io = Kaltura::KalturaStringIO.new("hey there", "custom_path.csv")
+    io.path.should == "custom_path.csv"
+  end
+
+end