b6489e718c
* Add error handler on save video to avoid creating sjson * Support transcripts without edx_video_id in definition_to_xml * When copying a video from a library to a course: Create a new edx_video_id * Save transcripts as static assets in a video in a library when adding a new transcript. * Delete transcripts as static assets in a video in a library when deleting transcripts. * Support download transcript in a video in a library. * Support replace transcript in a video in a library. * Support updating transcripts in video in a library. * Refactor the code of downloading YouTube transcripts to enable this feature in libraries. * Support copy from a library to a course and a course to a library.
677 lines
26 KiB
Python
677 lines
26 KiB
Python
"""
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Handlers for video block.
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StudentViewHandlers are handlers for video block instance.
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StudioViewHandlers are handlers for video descriptor instance.
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"""
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import json
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import logging
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import math
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from django.core.files.base import ContentFile
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from django.utils.timezone import now
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from edxval.api import create_external_video, create_or_update_video_transcript, delete_video_transcript
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from opaque_keys.edx.locator import CourseLocator, LibraryLocatorV2
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from webob import Response
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from xblock.core import XBlock
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from xblock.exceptions import JsonHandlerError
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from xmodule.exceptions import NotFoundError
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from xmodule.fields import RelativeTime
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from openedx.core.djangoapps.content_libraries import api as lib_api
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from .transcripts_utils import (
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Transcript,
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TranscriptException,
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TranscriptsGenerationException,
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clean_video_id,
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generate_sjson_for_all_speeds,
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get_html5_ids,
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get_or_create_sjson,
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get_transcript,
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get_transcript_from_contentstore,
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remove_subs_from_store,
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subs_filename,
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youtube_speed_dict
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)
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log = logging.getLogger(__name__)
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# Disable no-member warning:
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# pylint: disable=no-member
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def to_boolean(value):
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"""
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Convert a value from a GET or POST request parameter to a bool
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"""
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if isinstance(value, bytes):
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value = value.decode('ascii', errors='replace')
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if isinstance(value, str):
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return value.lower() == 'true'
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else:
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return bool(value)
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class VideoStudentViewHandlers:
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"""
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Handlers for video block instance.
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"""
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global_speed = None
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transcript_language = None
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def handle_ajax(self, dispatch, data):
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"""
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Update values of xfields, that were changed by student.
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"""
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accepted_keys = [
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'speed', 'auto_advance', 'saved_video_position', 'transcript_language',
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'transcript_download_format', 'youtube_is_available',
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'bumper_last_view_date', 'bumper_do_not_show_again'
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]
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conversions = {
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'speed': json.loads,
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'auto_advance': json.loads,
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'saved_video_position': RelativeTime.isotime_to_timedelta,
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'youtube_is_available': json.loads,
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'bumper_last_view_date': to_boolean,
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'bumper_do_not_show_again': to_boolean,
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}
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if dispatch == 'save_user_state':
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for key in data:
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if key in accepted_keys:
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if key in conversions:
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value = conversions[key](data[key])
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else:
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value = data[key]
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if key == 'bumper_last_view_date':
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value = now()
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if key == 'speed' and math.isnan(value):
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message = f"Invalid speed value {value}, must be a float."
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log.warning(message)
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return json.dumps({'success': False, 'error': message})
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setattr(self, key, value)
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if key == 'speed':
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self.global_speed = self.speed
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return json.dumps({'success': True})
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log.debug(f"GET {data}")
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log.debug(f"DISPATCH {dispatch}")
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raise NotFoundError('Unexpected dispatch type')
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def translation(self, youtube_id, transcripts):
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"""
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This is called to get transcript file for specific language.
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youtube_id: str: must be one of youtube_ids or None if HTML video
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transcripts (dict): A dict with all transcripts and a sub.
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Logic flow:
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If youtube_id doesn't exist, we have a video in HTML5 mode. Otherwise,
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video in Youtube or Flash modes.
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if youtube:
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If english -> give back youtube_id subtitles:
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Return what we have in contentstore for given youtube_id.
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If non-english:
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a) extract youtube_id from srt file name.
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b) try to find sjson by youtube_id and return if successful.
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c) generate sjson from srt for all youtube speeds.
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if non-youtube:
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If english -> give back `sub` subtitles:
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Return what we have in contentstore for given subs_if that is stored in self.sub.
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If non-english:
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a) try to find previously generated sjson.
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b) otherwise generate sjson from srt and return it.
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Filenames naming:
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en: subs_videoid.srt.sjson
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non_en: uk_subs_videoid.srt.sjson
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Raises:
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NotFoundError if for 'en' subtitles no asset is uploaded.
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NotFoundError if youtube_id does not exist / invalid youtube_id
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"""
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sub, other_lang = transcripts["sub"], transcripts["transcripts"]
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if youtube_id:
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# Youtube case:
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if self.transcript_language == 'en':
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return Transcript.asset(self.location, youtube_id).data
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youtube_ids = youtube_speed_dict(self)
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if youtube_id not in youtube_ids:
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log.info("Youtube_id %s does not exist", youtube_id)
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raise NotFoundError
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try:
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sjson_transcript = Transcript.asset(self.location, youtube_id, self.transcript_language).data
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except NotFoundError:
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log.info("Can't find content in storage for %s transcript: generating.", youtube_id)
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generate_sjson_for_all_speeds(
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self,
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other_lang[self.transcript_language],
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{speed: youtube_id for youtube_id, speed in youtube_ids.items()},
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self.transcript_language
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)
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sjson_transcript = Transcript.asset(self.location, youtube_id, self.transcript_language).data
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return sjson_transcript
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else:
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# HTML5 case
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if self.transcript_language == 'en':
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if '.srt' not in sub: # not bumper case
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return Transcript.asset(self.location, sub).data
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try:
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return get_or_create_sjson(self, {'en': sub})
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except TranscriptException:
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pass # to raise NotFoundError and try to get data in get_static_transcript
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elif other_lang:
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return get_or_create_sjson(self, other_lang)
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raise NotFoundError
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def get_static_transcript(self, request, transcripts):
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"""
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Courses that are imported with the --nostatic flag do not show
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transcripts/captions properly even if those captions are stored inside
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their static folder. This adds a last resort method of redirecting to
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the static asset path of the course if the transcript can't be found
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inside the contentstore and the course has the static_asset_path field
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set.
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transcripts (dict): A dict with all transcripts and a sub.
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"""
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response = Response(status=404)
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# Only do redirect for English
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if not self.transcript_language == 'en':
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return response
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# If this video lives in library, the code below is not relevant and will error.
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if not isinstance(self.course_id, CourseLocator):
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return response
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video_id = request.GET.get('videoId', None)
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if video_id:
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transcript_name = video_id
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else:
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transcript_name = transcripts["sub"]
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if transcript_name:
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# Get the asset path for course
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asset_path = None
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course = self.runtime.modulestore.get_course(self.course_id)
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if course.static_asset_path:
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asset_path = course.static_asset_path
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else:
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# It seems static_asset_path is not set in any XMLModuleStore courses.
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asset_path = getattr(course, 'data_dir', '')
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if asset_path:
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response = Response(
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status=307,
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location='/static/{}/{}'.format(
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asset_path,
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subs_filename(transcript_name, self.transcript_language)
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)
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)
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return response
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@XBlock.json_handler
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def publish_completion(self, data, dispatch): # pylint: disable=unused-argument
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"""
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Entry point for completion for student_view.
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Parameters:
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data: JSON dict:
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key: "completion"
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value: float in range [0.0, 1.0]
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dispatch: Ignored.
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Return value: JSON response (200 on success, 400 for malformed data)
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"""
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completion_service = self.runtime.service(self, 'completion')
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if completion_service is None:
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raise JsonHandlerError(500, "No completion service found")
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if not completion_service.completion_tracking_enabled():
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raise JsonHandlerError(404, "Completion tracking is not enabled and API calls are unexpected")
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if not isinstance(data['completion'], (int, float)):
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message = "Invalid completion value {}. Must be a float in range [0.0, 1.0]"
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raise JsonHandlerError(400, message.format(data['completion']))
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if not 0.0 <= data['completion'] <= 1.0:
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message = "Invalid completion value {}. Must be in range [0.0, 1.0]"
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raise JsonHandlerError(400, message.format(data['completion']))
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self.runtime.publish(self, "completion", data)
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return {"result": "ok"}
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@staticmethod
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def make_transcript_http_response(content, filename, language, content_type, add_attachment_header=True):
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"""
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Construct `Response` object.
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Arguments:
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content (unicode): transcript content
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filename (unicode): transcript filename
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language (unicode): transcript language
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mimetype (unicode): transcript content type
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add_attachment_header (bool): whether to add attachment header or not
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"""
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headerlist = [
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('Content-Language', language),
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]
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if add_attachment_header:
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headerlist.append(
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(
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'Content-Disposition',
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f'attachment; filename="{filename}"'
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)
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)
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response = Response(
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content,
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headerlist=headerlist,
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charset='utf8'
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)
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response.content_type = content_type
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return response
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@XBlock.handler
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def transcript(self, request, dispatch):
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"""
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Entry point for transcript handlers for student_view.
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Request GET contains:
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(optional) `videoId` for `translation` dispatch.
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`is_bumper=1` flag for bumper case.
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Dispatches, (HTTP GET):
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/translation/[language_id]
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/download
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/available_translations/
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Explanations:
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`download`: returns SRT or TXT file.
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`translation`: depends on HTTP methods:
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Provide translation for requested language, SJSON format is sent back on success,
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Proper language_id should be in url.
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`available_translations`:
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Returns list of languages, for which transcript files exist.
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For 'en' check if SJSON exists. For non-`en` check if SRT file exists.
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"""
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is_bumper = request.GET.get('is_bumper', False)
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transcripts = self.get_transcripts_info(is_bumper)
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if dispatch.startswith('translation'):
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language = dispatch.replace('translation', '').strip('/')
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# Because scrapers hit video blocks, verify that a user exists.
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# use the _request attr to get the django request object.
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if not request._request.user: # pylint: disable=protected-access
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log.info("Transcript: user must be logged or public view enabled to get transcript")
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return Response(status=403)
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if not language:
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log.info("Invalid /translation request: no language.")
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return Response(status=400)
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if language not in ['en'] + list(transcripts["transcripts"].keys()):
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log.info("Video: transcript facilities are not available for given language.")
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return Response(status=404)
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if language != self.transcript_language:
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self.transcript_language = language
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try:
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if is_bumper:
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content, filename, mimetype = get_transcript_from_contentstore(
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self,
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self.transcript_language,
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Transcript.SJSON,
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transcripts
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)
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else:
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content, filename, mimetype = get_transcript(
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self,
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lang=self.transcript_language,
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output_format=Transcript.SJSON,
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youtube_id=request.GET.get('videoId'),
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)
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response = self.make_transcript_http_response(
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content,
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filename,
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self.transcript_language,
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mimetype,
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add_attachment_header=False
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)
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except NotFoundError as exc:
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edx_video_id = clean_video_id(self.edx_video_id)
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log.warning(
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'[Translation Dispatch] %s: %s',
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self.location,
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exc if is_bumper else f'Transcript not found for {edx_video_id}, lang: {self.transcript_language}',
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)
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response = self.get_static_transcript(request, transcripts)
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elif dispatch == 'download':
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lang = request.GET.get('lang', None)
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try:
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content, filename, mimetype = get_transcript(self, lang, output_format=self.transcript_download_format)
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except NotFoundError:
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return Response(status=404)
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response = self.make_transcript_http_response(
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content,
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filename,
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self.transcript_language,
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mimetype
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)
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elif dispatch.startswith('available_translations'):
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available_translations = self.available_translations(
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transcripts,
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verify_assets=True,
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is_bumper=is_bumper
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)
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if available_translations:
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response = Response(json.dumps(available_translations))
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response.content_type = 'application/json'
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else:
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response = Response(status=404)
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else: # unknown dispatch
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log.debug("Dispatch is not allowed")
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response = Response(status=404)
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return response
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@XBlock.handler
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def student_view_user_state(self, request, suffix=''): # lint-amnesty, pylint: disable=unused-argument
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"""
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Endpoint to get user-specific state, like current position and playback speed,
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without rendering the full student_view HTML. This is similar to student_view_state,
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but that one cannot contain user-specific info.
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"""
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view_state = self.student_view_data()
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view_state.update({
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"saved_video_position": self.saved_video_position.total_seconds(),
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"speed": self.speed,
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})
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return Response(
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json.dumps(view_state),
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content_type='application/json',
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charset='UTF-8'
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)
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@XBlock.handler
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def yt_video_metadata(self, request, suffix=''): # lint-amnesty, pylint: disable=unused-argument
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"""
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Endpoint to get YouTube metadata.
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This handler is only used in the Learning-Core-based runtime. The old
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runtime uses a similar REST API that's not an XBlock handler.
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"""
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from lms.djangoapps.courseware.views.views import load_metadata_from_youtube
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if not self.youtube_id_1_0:
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# TODO: more informational response to explain that yt_video_metadata not supported for non-youtube videos.
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return Response('{}', status=400)
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metadata, status_code = load_metadata_from_youtube(video_id=self.youtube_id_1_0, request=request)
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response = Response(json.dumps(metadata), status=status_code)
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response.content_type = 'application/json'
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return response
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class VideoStudioViewHandlers:
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"""
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Handlers for Studio view.
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"""
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def validate_transcript_upload_data(self, data):
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"""
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Validates video transcript file.
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Arguments:
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data: Transcript data to be validated.
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Returns:
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None or String
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If there is error returns error message otherwise None.
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"""
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error = None
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_ = self.runtime.service(self, "i18n").ugettext
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# Validate the must have attributes - this error is unlikely to be faced by common users.
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must_have_attrs = ['edx_video_id', 'language_code', 'new_language_code']
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missing = [attr for attr in must_have_attrs if attr not in data]
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# Get available transcript languages.
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transcripts = self.get_transcripts_info()
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available_translations = self.available_translations(transcripts, verify_assets=True)
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if missing:
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error = _('The following parameters are required: {missing}.').format(missing=', '.join(missing))
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elif (
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data['language_code'] != data['new_language_code'] and data['new_language_code'] in available_translations
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):
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error = _('A transcript with the "{language_code}" language code already exists.').format(
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language_code=data['new_language_code'],
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)
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elif 'file' not in data:
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error = _('A transcript file is required.')
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return error
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@XBlock.handler
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def studio_transcript(self, request, dispatch):
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"""
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Entry point for Studio transcript handlers.
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Dispatches:
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/translation/[language_id] - language_id sould be in url.
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`translation` dispatch support following HTTP methods:
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`POST`:
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Upload srt file. Check possibility of generation of proper sjson files.
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For now, it works only for self.transcripts, not for `en`.
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`GET:
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Return filename from storage. SRT format is sent back on success. Filename should be in GET dict.
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We raise all exceptions right in Studio:
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NotFoundError:
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Video or asset was deleted from module/contentstore, but request came later.
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Seems impossible to be raised. block_render.py catches NotFoundErrors from here.
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/translation POST:
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TypeError:
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Unjsonable filename or content.
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TranscriptsGenerationException, TranscriptException:
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no SRT extension or not parse-able by PySRT
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UnicodeDecodeError: non-UTF8 uploaded file content encoding.
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"""
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if dispatch.startswith('translation'):
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if request.method == 'POST':
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response = self._studio_transcript_upload(request)
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elif request.method == 'DELETE':
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response = self._studio_transcript_delete(request)
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elif request.method == 'GET':
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response = self._studio_transcript_get(request)
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else:
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# Any other HTTP method is not allowed.
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response = Response(status=404)
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else: # unknown dispatch
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log.debug("Dispatch is not allowed")
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response = Response(status=404)
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return response
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def _save_transcript_field(self):
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"""
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Save `transcripts` block field.
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"""
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field = self.fields['transcripts']
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if self.transcripts:
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transcripts_copy = self.transcripts.copy()
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# Need to delete to overwrite, it's weird behavior,
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# but it only works like this.
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field.delete_from(self)
|
|
field.write_to(self, transcripts_copy)
|
|
else:
|
|
field.delete_from(self)
|
|
|
|
def _studio_transcript_upload(self, request):
|
|
"""
|
|
Upload transcript. Used in "POST" method in `studio_transcript`
|
|
"""
|
|
_ = self.runtime.service(self, "i18n").ugettext
|
|
error = self.validate_transcript_upload_data(data=request.POST)
|
|
if error:
|
|
response = Response(json={'error': error}, status=400)
|
|
else:
|
|
edx_video_id = clean_video_id(request.POST['edx_video_id'])
|
|
language_code = request.POST['language_code']
|
|
new_language_code = request.POST['new_language_code']
|
|
transcript_file = request.POST['file'].file
|
|
|
|
is_library = isinstance(self.usage_key.context_key, LibraryLocatorV2)
|
|
|
|
if is_library:
|
|
filename = f'transcript-{new_language_code}.srt'
|
|
else:
|
|
if not edx_video_id:
|
|
# Back-populate the video ID for an external video.
|
|
# pylint: disable=attribute-defined-outside-init
|
|
self.edx_video_id = edx_video_id = create_external_video(display_name='external video')
|
|
filename = f'{edx_video_id}-{new_language_code}.srt'
|
|
|
|
try:
|
|
# Convert SRT transcript into an SJSON format
|
|
# and upload it to S3.
|
|
content = transcript_file.read()
|
|
payload = {
|
|
'edx_video_id': edx_video_id,
|
|
'language_code': new_language_code
|
|
}
|
|
if is_library:
|
|
# Save transcript as static asset in Learning Core if is a library component
|
|
filename = f"static/{filename}"
|
|
lib_api.add_library_block_static_asset_file(
|
|
self.usage_key,
|
|
filename,
|
|
content,
|
|
)
|
|
else:
|
|
sjson_subs = Transcript.convert(
|
|
content=content.decode('utf-8'),
|
|
input_format=Transcript.SRT,
|
|
output_format=Transcript.SJSON
|
|
).encode()
|
|
create_or_update_video_transcript(
|
|
video_id=edx_video_id,
|
|
language_code=language_code,
|
|
metadata={
|
|
'file_format': Transcript.SJSON,
|
|
'language_code': new_language_code
|
|
},
|
|
file_data=ContentFile(sjson_subs),
|
|
)
|
|
|
|
# If a new transcript is added, then both new_language_code and
|
|
# language_code fields will have the same value.
|
|
if language_code != new_language_code:
|
|
self.transcripts.pop(language_code, None)
|
|
self.transcripts[new_language_code] = filename
|
|
|
|
if is_library:
|
|
self._save_transcript_field()
|
|
response = Response(json.dumps(payload), status=201)
|
|
except (TranscriptsGenerationException, UnicodeDecodeError):
|
|
response = Response(
|
|
json={
|
|
'error': _(
|
|
'There is a problem with this transcript file. Try to upload a different file.'
|
|
)
|
|
},
|
|
status=400
|
|
)
|
|
return response
|
|
|
|
def _studio_transcript_delete(self, request):
|
|
"""
|
|
Delete transcript. Used in "DELETE" method in `studio_transcript`
|
|
"""
|
|
request_data = request.json
|
|
|
|
if 'lang' not in request_data or 'edx_video_id' not in request_data:
|
|
return Response(status=400)
|
|
|
|
language = request_data['lang']
|
|
edx_video_id = clean_video_id(request_data['edx_video_id'])
|
|
|
|
if edx_video_id:
|
|
delete_video_transcript(video_id=edx_video_id, language_code=language)
|
|
|
|
if isinstance(self.usage_key.context_key, LibraryLocatorV2):
|
|
transcript_name = self.transcripts.pop(language, None)
|
|
if transcript_name:
|
|
# TODO: In the future, we need a proper XBlock API
|
|
# like `self.static_assets.delete(...)` instead of coding
|
|
# these runtime-specific/library-specific APIs.
|
|
lib_api.delete_library_block_static_asset_file(
|
|
self.usage_key,
|
|
f"static/{transcript_name}",
|
|
)
|
|
self._save_transcript_field()
|
|
else:
|
|
if language == 'en':
|
|
# remove any transcript file from content store for the video ids
|
|
possible_sub_ids = [
|
|
self.sub, # pylint: disable=access-member-before-definition
|
|
self.youtube_id_1_0
|
|
] + get_html5_ids(self.html5_sources)
|
|
for sub_id in possible_sub_ids:
|
|
remove_subs_from_store(sub_id, self, language)
|
|
|
|
# update metadata as `en` can also be present in `transcripts` field
|
|
remove_subs_from_store(self.transcripts.pop(language, None), self, language)
|
|
|
|
# also empty `sub` field
|
|
self.sub = '' # pylint: disable=attribute-defined-outside-init
|
|
else:
|
|
remove_subs_from_store(self.transcripts.pop(language, None), self, language)
|
|
|
|
return Response(status=200)
|
|
|
|
def _studio_transcript_get(self, request):
|
|
"""
|
|
Get transcript. Used in "GET" method in `studio_transcript`
|
|
"""
|
|
_ = self.runtime.service(self, "i18n").ugettext
|
|
language = request.GET.get('language_code')
|
|
if not language:
|
|
return Response(json={'error': _('Language is required.')}, status=400)
|
|
|
|
try:
|
|
transcript_content, transcript_name, mime_type = get_transcript(
|
|
video=self, lang=language, output_format=Transcript.SRT
|
|
)
|
|
response = Response(transcript_content, headerlist=[
|
|
(
|
|
'Content-Disposition',
|
|
f'attachment; filename="{transcript_name}"'
|
|
),
|
|
('Content-Language', language),
|
|
('Content-Type', mime_type)
|
|
])
|
|
except (UnicodeDecodeError, TranscriptsGenerationException, NotFoundError):
|
|
response = Response(status=404)
|
|
return response
|