163 lines
5.8 KiB
Python
163 lines
5.8 KiB
Python
"""
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Serializer for video outline
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"""
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from rest_framework.reverse import reverse
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from courseware.access import has_access
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from edxval.api import (
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get_video_info_for_course_and_profile, ValInternalError
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)
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class BlockOutline(object):
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"""
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Serializes course videos, pulling data from VAL and the video modules.
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"""
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def __init__(self, course_id, start_block, categories_to_outliner, request):
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"""Create a BlockOutline using `start_block` as a starting point."""
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self.start_block = start_block
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self.categories_to_outliner = categories_to_outliner
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self.course_id = course_id
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self.request = request # needed for making full URLS
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self.local_cache = {}
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try:
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self.local_cache['course_videos'] = get_video_info_for_course_and_profile(
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unicode(course_id), "mobile_low"
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)
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except ValInternalError: # pragma: nocover
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self.local_cache['course_videos'] = {}
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def __iter__(self):
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child_to_parent = {}
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stack = [self.start_block]
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# path should be optional
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def path(block):
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"""path for block"""
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block_path = []
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while block in child_to_parent:
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block = child_to_parent[block]
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if block is not self.start_block:
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block_path.append({
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# to be consistent with other edx-platform clients, return the defaulted display name
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'name': block.display_name_with_default,
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'category': block.category,
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})
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return reversed(block_path)
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def find_urls(block):
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"""section and unit urls for block"""
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block_path = []
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while block in child_to_parent:
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block = child_to_parent[block]
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block_path.append(block)
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course, chapter, section, unit = list(reversed(block_path))[:4]
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position = 1
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unit_name = unit.url_name
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for block in section.children:
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if block.name == unit_name:
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break
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position += 1
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kwargs = dict(
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course_id=course.id.to_deprecated_string(),
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chapter=chapter.url_name,
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section=section.url_name
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)
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section_url = reverse(
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"courseware_section",
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kwargs=kwargs,
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request=self.request,
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)
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kwargs['position'] = position
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unit_url = reverse(
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"courseware_position",
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kwargs=kwargs,
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request=self.request,
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)
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return unit_url, section_url, block_path
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user = self.request.user
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while stack:
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curr_block = stack.pop()
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if curr_block.hide_from_toc:
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# For now, if the 'hide_from_toc' setting is set on the block, do not traverse down
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# the hierarchy. The reason being is that these blocks may not have human-readable names
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# to display on the mobile clients.
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# Eventually, we'll need to figure out how we want these blocks to be displayed on the
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# mobile clients. As, they are still accessible in the browser, just not navigatable
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# from the table-of-contents.
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continue
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if curr_block.category in self.categories_to_outliner:
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if not has_access(user, 'load', curr_block, course_key=self.course_id):
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continue
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summary_fn = self.categories_to_outliner[curr_block.category]
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block_path = list(path(curr_block))
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unit_url, section_url, _ = find_urls(curr_block)
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yield {
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"path": block_path,
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"named_path": [b["name"] for b in block_path[:-1]],
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"unit_url": unit_url,
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"section_url": section_url,
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"summary": summary_fn(self.course_id, curr_block, self.request, self.local_cache)
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}
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if curr_block.has_children:
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for block in reversed(curr_block.get_children()):
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stack.append(block)
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child_to_parent[block] = curr_block
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def video_summary(course, course_id, video_descriptor, request, local_cache):
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"""
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returns summary dict for the given video module
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"""
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# First try to check VAL for the URLs we want.
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val_video_info = local_cache['course_videos'].get(video_descriptor.edx_video_id, {})
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if val_video_info:
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video_url = val_video_info['url']
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# Then fall back to VideoDescriptor fields for video URLs
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elif video_descriptor.html5_sources:
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video_url = video_descriptor.html5_sources[0]
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else:
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video_url = video_descriptor.source
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# If we have the video information from VAL, we also have duration and size.
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duration = val_video_info.get('duration', None)
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size = val_video_info.get('file_size', 0)
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# Transcripts...
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transcript_langs = video_descriptor.available_translations(verify_assets=False)
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transcripts = {
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lang: reverse(
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'video-transcripts-detail',
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kwargs={
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'course_id': unicode(course_id),
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'block_id': video_descriptor.scope_ids.usage_id.block_id,
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'lang': lang
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},
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request=request,
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)
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for lang in transcript_langs
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}
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return {
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"video_url": video_url,
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"video_thumbnail_url": None,
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"duration": duration,
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"size": size,
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"name": video_descriptor.display_name,
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"transcripts": transcripts,
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"language": video_descriptor.get_default_transcript_language(),
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"category": video_descriptor.category,
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"id": unicode(video_descriptor.scope_ids.usage_id),
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}
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