Show validation message when no transcript file uploaded for a language in a…

Show validation message when no transcript file uploaded for a language in a video component in studio.
Also, don't show respective transcript language in video language menu when a related transcript is not uploaded for that language.

TNL-5200

common/lib/xmodule/xmodule/tests/test_video.py

@@ -21,6 +21,7 @@ from mock import ANY, Mock, patch
 import ddt
 
 from django.conf import settings
+from django.test.utils import override_settings
 
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
 from opaque_keys.edx.keys import CourseKey
@@ -28,6 +29,7 @@ from xblock.field_data import DictFieldData
 from xblock.fields import ScopeIds
 
 from xmodule.tests import get_test_descriptor_system
+from xmodule.validation import StudioValidationMessage
 from xmodule.video_module import VideoDescriptor, create_youtube_string
 from xmodule.video_module.transcripts_utils import download_youtube_subs, save_to_store
 from . import LogicTest
@@ -77,6 +79,12 @@ YOUTUBE_SUBTITLES = (
     " that now. The tutorial will continue in the next video."
 )
 
+ALL_LANGUAGES = (
+    [u"en", u"English"],
+    [u"eo", u"Esperanto"],
+    [u"ur", u"Urdu"]
+)
+
 
 def instantiate_descriptor(**field_data):
     """
@@ -780,6 +788,7 @@ class VideoExportTestCase(VideoDescriptorTestBase):
         self.assertEqual(xml.get('display_name'), u'\u8fd9\u662f\u6587')
 
 
+@ddt.ddt
 class VideoDescriptorIndexingTestCase(unittest.TestCase):
     """
     Make sure that VideoDescriptor can format data for indexing as expected.
@@ -993,3 +1002,74 @@ class VideoDescriptorIndexingTestCase(unittest.TestCase):
         descriptor = instantiate_descriptor(data=None)
         translations = descriptor.available_translations(descriptor.get_transcripts_info(), verify_assets=False)
         self.assertEqual(translations, ['en'])
+
+    @override_settings(ALL_LANGUAGES=ALL_LANGUAGES)
+    def test_video_with_language_do_not_have_transcripts_translation(self):
+        """
+        Test translation retrieval of a video module with
+        a language having no transcripts uploaded by a user.
+        """
+        xml_data_transcripts = '''
+            <video display_name="Test Video"
+                   youtube="1.0:p2Q6BrNhdh8,0.75:izygArpw-Qo,1.25:1EeWXzPdhSA,1.5:rABDYkeK0x8"
+                   show_captions="false"
+                   download_track="false"
+                   start_time="00:00:01"
+                   download_video="false"
+                   end_time="00:01:00">
+              <source src="http://www.example.com/source.mp4"/>
+              <track src="http://www.example.com/track"/>
+              <handout src="http://www.example.com/handout"/>
+              <transcript language="ur" src="" />
+            </video>
+        '''
+        descriptor = instantiate_descriptor(data=xml_data_transcripts)
+        translations = descriptor.available_translations(descriptor.get_transcripts_info(), verify_assets=False)
+        self.assertNotEqual(translations, ['ur'])
+
+    def assert_validation_message(self, validation, expected_msg):
+        """
+        Asserts that the validation message has all expected content.
+
+        Args:
+            validation (StudioValidation): A validation object.
+            expected_msg (string): An expected validation message.
+        """
+        self.assertFalse(validation.empty)  # Validation contains some warning/message
+        self.assertTrue(validation.summary)
+        self.assertEqual(StudioValidationMessage.WARNING, validation.summary.type)
+        self.assertIn(expected_msg, validation.summary.text)
+
+    @ddt.data(
+        (
+            '<transcript language="ur" src="" />',
+            'There is no transcript file associated with the Urdu language.'
+        ),
+        (
+            '<transcript language="eo" src="" /><transcript language="ur" src="" />',
+            'There are no transcript files associated with the Esperanto, Urdu languages.'
+        ),
+    )
+    @ddt.unpack
+    @override_settings(ALL_LANGUAGES=ALL_LANGUAGES)
+    def test_no_transcript_validation_message(self, xml_transcripts, expected_validation_msg):
+        """
+        Test the validation message when no associated transcript file uploaded.
+        """
+        xml_data_transcripts = '''
+            <video display_name="Test Video"
+                   youtube="1.0:p2Q6BrNhdh8,0.75:izygArpw-Qo,1.25:1EeWXzPdhSA,1.5:rABDYkeK0x8"
+                   show_captions="false"
+                   download_track="false"
+                   start_time="00:00:01"
+                   download_video="false"
+                   end_time="00:01:00">
+              <source src="http://www.example.com/source.mp4"/>
+              <track src="http://www.example.com/track"/>
+              <handout src="http://www.example.com/handout"/>
+              {xml_transcripts}
+            </video>
+        '''.format(xml_transcripts=xml_transcripts)
+        descriptor = instantiate_descriptor(data=xml_data_transcripts)
+        validation = descriptor.validate()
+        self.assert_validation_message(validation, expected_validation_msg)

common/lib/xmodule/xmodule/video_module/transcripts_utils.py

@@ -383,9 +383,7 @@ def manage_video_subtitles_save(item, user, old_metadata=None, generate_translat
                     lang,
                 )
             except TranscriptException as ex:
-                # remove key from transcripts because proper srt file does not exist in assets.
-                item.transcripts.pop(lang)
-                reraised_message += ' ' + ex.message
+                pass
         if reraised_message:
             item.save_with_metadata(user)
             raise TranscriptException(reraised_message)
@@ -531,6 +529,9 @@ class Transcript(object):
         """
         Return asset location. `location` is module location.
         """
+        # If user transcript filename is empty, raise `TranscriptException` to avoid `InvalidKeyError`.
+        if not filename:
+            raise TranscriptException("Transcript not uploaded yet")
         return StaticContent.compute_location(location.course_key, filename)
 
     @staticmethod
@@ -670,12 +671,17 @@ class VideoTranscriptsMixin(object):
         """
         if is_bumper:
             transcripts = copy.deepcopy(get_bumper_settings(self).get('transcripts', {}))
-            return {
-                "sub": transcripts.pop("en", ""),
-                "transcripts": transcripts,
-            }
+            sub = transcripts.pop("en", "")
         else:
-            return {
-                "sub": self.sub,
-                "transcripts": self.transcripts,
-            }
+            transcripts = self.transcripts
+            sub = self.sub
+
+        # Only attach transcripts that are not empty.
+        transcripts = {
+            language_code: transcript_file
+            for language_code, transcript_file in transcripts.items() if transcript_file != ''
+        }
+        return {
+            "sub": sub,
+            "transcripts": transcripts,
+        }

common/lib/xmodule/xmodule/video_module/video_module.py

@@ -36,6 +36,7 @@ from xmodule.raw_module import EmptyDataRawDescriptor
 from xmodule.xml_module import is_pointer_tag, name_to_pathname, deserialize_field
 from xmodule.exceptions import NotFoundError
 from xmodule.contentstore.content import StaticContent
+from xmodule.validation import StudioValidationMessage, StudioValidation
 
 from .transcripts_utils import VideoTranscriptsMixin, Transcript, get_html5_ids
 from .video_utils import create_youtube_string, get_poster, rewrite_video_url, format_xml_exception_message
@@ -152,6 +153,12 @@ class VideoModule(VideoFields, VideoTranscriptsMixin, VideoStudentViewHandlers,
     ]}
     js_module_name = "Video"
 
+    def validate(self):
+        """
+        Validates the state of this Video Module Instance.
+        """
+        return self.descriptor.validate()
+
     def get_transcripts_for_student(self, transcripts):
         """Return transcript information necessary for rendering the XModule student view.
         This is more or less a direct extraction from `get_html`.
@@ -427,6 +434,35 @@ class VideoDescriptor(VideoFields, VideoTranscriptsMixin, VideoStudioViewHandler
         if not self.fields['download_track'].is_set_on(self) and self.track:
             self.download_track = True
 
+    def validate(self):
+        """
+        Validates the state of this video Module Instance. This
+        is the override of the general XBlock method, and it will also ask
+        its superclass to validate.
+        """
+        validation = super(VideoDescriptor, self).validate()
+        if not isinstance(validation, StudioValidation):
+            validation = StudioValidation.copy(validation)
+
+        no_transcript_lang = []
+        for lang_code, transcript in self.transcripts.items():
+            if not transcript:
+                no_transcript_lang.append([label for code, label in settings.ALL_LANGUAGES if code == lang_code][0])
+
+        if no_transcript_lang:
+            ungettext = self.runtime.service(self, "i18n").ungettext
+            validation.set_summary(
+                StudioValidationMessage(
+                    StudioValidationMessage.WARNING,
+                    ungettext(
+                        'There is no transcript file associated with the {lang} language.',
+                        'There are no transcript files associated with the {lang} languages.',
+                        len(no_transcript_lang)
+                    ).format(lang=', '.join(no_transcript_lang))
+                )
+            )
+        return validation
+
     def editor_saved(self, user, old_metadata, old_content):
         """
         Used to update video values during `self`:save method from CMS.

common/test/acceptance/tests/video/test_studio_video_editor.py

@@ -126,6 +126,27 @@ class VideoEditorTest(CMSVideoBaseTest):
         self.assertIn(unicode_text, self.video.captions_text)
         self.assertEqual(self.video.caption_languages.keys(), ['zh', 'uk'])
 
+    def test_save_language_upload_no_transcript(self):
+        """
+        Scenario: Transcript language is not shown in language menu if no transcript file is uploaded
+        Given I have created a Video component
+        And I edit the component
+        And I open tab "Advanced"
+        And I add a language "uk" but do not upload an .srt file
+        And I save changes
+        When I view the video language menu
+        Then I am not able to see the language "uk" translation language
+        """
+        self._create_video_component()
+        self.edit_component()
+        self.open_advanced_tab()
+        language_code = 'uk'
+        self.video.click_button('translation_add')
+        translations_count = self.video.translations_count()
+        self.video.select_translation_language(language_code, translations_count - 1)
+        self.save_unit_settings()
+        self.assertNotIn(language_code, self.video.caption_languages.keys())
+
     def test_upload_large_transcript(self):
         """
         Scenario: User can upload transcript file with > 1mb size