c97932fa99
* fix: add missing protocol to web link for assets * test: fix asset path test * refactor: update asset web URL to use urljoin
609 lines
22 KiB
Python
609 lines
22 KiB
Python
"""Views for assets"""
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import json
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import logging
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import math
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import re
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from functools import partial
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from urllib.parse import urljoin
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from django.conf import settings
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from django.contrib.auth.decorators import login_required
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from django.core.exceptions import PermissionDenied
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from django.http import HttpResponseBadRequest, HttpResponseNotFound
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from django.utils.translation import ugettext as _
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from django.views.decorators.csrf import ensure_csrf_cookie
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from django.views.decorators.http import require_http_methods, require_POST
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from opaque_keys.edx.keys import AssetKey, CourseKey
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from pymongo import ASCENDING, DESCENDING
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from common.djangoapps.edxmako.shortcuts import render_to_response
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from common.djangoapps.student.auth import has_course_author_access
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from common.djangoapps.util.date_utils import get_default_time_display
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from common.djangoapps.util.json_request import JsonResponse
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from openedx.core.djangoapps.contentserver.caching import del_cached_content
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from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
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from xmodule.contentstore.content import StaticContent
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from xmodule.contentstore.django import contentstore
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from xmodule.exceptions import NotFoundError
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from xmodule.modulestore.django import modulestore
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from xmodule.modulestore.exceptions import ItemNotFoundError
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from ..utils import reverse_course_url
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from .exception import AssetNotFoundException, AssetSizeTooLargeException
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__all__ = ['assets_handler']
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REQUEST_DEFAULTS = {
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'page': 0,
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'page_size': 50,
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'sort': 'date_added',
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'direction': '',
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'asset_type': '',
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'text_search': '',
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}
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@login_required
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@ensure_csrf_cookie
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def assets_handler(request, course_key_string=None, asset_key_string=None):
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'''
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The restful handler for assets.
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It allows retrieval of all the assets (as an HTML page), as well as uploading new assets,
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deleting assets, and changing the 'locked' state of an asset.
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GET
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html: return an html page which will show all course assets. Note that only the asset container
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is returned and that the actual assets are filled in with a client-side request.
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json: returns a page of assets. The following parameters are supported:
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page: the desired page of results (defaults to 0)
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page_size: the number of items per page (defaults to 50)
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sort: the asset field to sort by (defaults to 'date_added')
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direction: the sort direction (defaults to 'descending')
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asset_type: the file type to filter items to (defaults to All)
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text_search: string to filter results by file name (defaults to '')
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POST
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json: create (or update?) an asset. The only updating that can be done is changing the lock state.
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PUT
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json: update the locked state of an asset
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DELETE
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json: delete an asset
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'''
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course_key = CourseKey.from_string(course_key_string)
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if not has_course_author_access(request.user, course_key):
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raise PermissionDenied()
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response_format = _get_response_format(request)
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if _request_response_format_is_json(request, response_format):
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if request.method == 'GET':
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return _assets_json(request, course_key)
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asset_key = AssetKey.from_string(asset_key_string) if asset_key_string else None
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return _update_asset(request, course_key, asset_key)
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elif request.method == 'GET': # assume html
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return _asset_index(request, course_key)
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return HttpResponseNotFound()
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def _get_response_format(request):
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return request.GET.get('format') or request.POST.get('format') or 'html'
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def _request_response_format_is_json(request, response_format):
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return response_format == 'json' or 'application/json' in request.META.get('HTTP_ACCEPT', 'application/json')
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def _asset_index(request, course_key):
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'''
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Display an editable asset library.
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Supports start (0-based index into the list of assets) and max query parameters.
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'''
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course_module = modulestore().get_course(course_key)
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return render_to_response('asset_index.html', {
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'language_code': request.LANGUAGE_CODE,
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'context_course': course_module,
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'max_file_size_in_mbs': settings.MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB,
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'chunk_size_in_mbs': settings.UPLOAD_CHUNK_SIZE_IN_MB,
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'max_file_size_redirect_url': settings.MAX_ASSET_UPLOAD_FILE_SIZE_URL,
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'asset_callback_url': reverse_course_url('assets_handler', course_key)
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})
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def _assets_json(request, course_key):
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'''
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Display an editable asset library.
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Supports start (0-based index into the list of assets) and max query parameters.
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'''
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request_options = _parse_request_to_dictionary(request)
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filter_parameters = {}
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if request_options['requested_asset_type']:
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filters_are_invalid_error = _get_error_if_invalid_parameters(request_options['requested_asset_type'])
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if filters_are_invalid_error is not None:
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return filters_are_invalid_error
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filter_parameters.update(_get_content_type_filter_for_mongo(request_options['requested_asset_type']))
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if request_options['requested_text_search']:
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filter_parameters.update(_get_displayname_search_filter_for_mongo(request_options['requested_text_search']))
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sort_type_and_direction = _get_sort_type_and_direction(request_options)
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requested_page_size = request_options['requested_page_size']
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current_page = _get_current_page(request_options['requested_page'])
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first_asset_to_display_index = _get_first_asset_index(current_page, requested_page_size)
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query_options = {
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'current_page': current_page,
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'page_size': requested_page_size,
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'sort': sort_type_and_direction,
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'filter_params': filter_parameters
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}
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assets, total_count = _get_assets_for_page(course_key, query_options)
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if request_options['requested_page'] > 0 and first_asset_to_display_index >= total_count and total_count > 0: # lint-amnesty, pylint: disable=chained-comparison
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_update_options_to_requery_final_page(query_options, total_count)
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current_page = query_options['current_page']
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first_asset_to_display_index = _get_first_asset_index(current_page, requested_page_size)
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assets, total_count = _get_assets_for_page(course_key, query_options)
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last_asset_to_display_index = first_asset_to_display_index + len(assets)
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assets_in_json_format = _get_assets_in_json_format(assets, course_key)
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response_payload = {
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'start': first_asset_to_display_index,
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'end': last_asset_to_display_index,
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'page': current_page,
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'pageSize': requested_page_size,
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'totalCount': total_count,
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'assets': assets_in_json_format,
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'sort': request_options['requested_sort'],
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'direction': request_options['requested_sort_direction'],
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'assetTypes': _get_requested_file_types_from_requested_filter(request_options['requested_asset_type']),
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'textSearch': request_options['requested_text_search'],
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}
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return JsonResponse(response_payload)
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def _parse_request_to_dictionary(request):
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return {
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'requested_page': int(_get_requested_attribute(request, 'page')),
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'requested_page_size': int(_get_requested_attribute(request, 'page_size')),
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'requested_sort': _get_requested_attribute(request, 'sort'),
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'requested_sort_direction': _get_requested_attribute(request, 'direction'),
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'requested_asset_type': _get_requested_attribute(request, 'asset_type'),
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'requested_text_search': _get_requested_attribute(request, 'text_search'),
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}
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def _get_requested_attribute(request, attribute):
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return request.GET.get(attribute, REQUEST_DEFAULTS.get(attribute))
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def _get_error_if_invalid_parameters(requested_filter):
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"""Function for returning error messages on filters"""
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requested_file_types = _get_requested_file_types_from_requested_filter(requested_filter)
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invalid_filters = []
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# OTHER is not described in the settings file as a filter
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all_valid_file_types = set(_get_files_and_upload_type_filters().keys())
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all_valid_file_types.add('OTHER')
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for requested_file_type in requested_file_types:
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if requested_file_type not in all_valid_file_types:
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invalid_filters.append(requested_file_type)
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if invalid_filters:
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error_message = {
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'error_code': 'invalid_asset_type_filter',
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'developer_message': 'The asset_type parameter to the request is invalid. '
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'The {} filters are not described in the settings.FILES_AND_UPLOAD_TYPE_FILTERS '
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'dictionary.'.format(invalid_filters)
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}
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return JsonResponse({'error': error_message}, status=400)
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def _get_content_type_filter_for_mongo(requested_filter):
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"""
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Construct and return pymongo query dict for the given content type categories.
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"""
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requested_file_types = _get_requested_file_types_from_requested_filter(requested_filter)
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type_filter = {
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"$or": []
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}
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if 'OTHER' in requested_file_types:
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type_filter["$or"].append(_get_mongo_expression_for_type_other())
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requested_file_types.remove('OTHER')
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type_filter["$or"].append(_get_mongo_expression_for_type_filter(requested_file_types))
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return type_filter
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def _get_mongo_expression_for_type_other():
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"""
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Construct and return pymongo expression dict for the 'OTHER' content type category.
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"""
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content_types = [ext for extensions in _get_files_and_upload_type_filters().values() for ext in extensions]
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return {
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'contentType': {
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'$nin': content_types
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}
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}
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def _get_mongo_expression_for_type_filter(requested_file_types):
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"""
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Construct and return pymongo expression dict for the named content type categories.
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The named content categories are the keys of the FILES_AND_UPLOAD_TYPE_FILTERS setting that are not 'OTHER':
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'Images', 'Documents', 'Audio', and 'Code'.
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"""
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content_types = []
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files_and_upload_type_filters = _get_files_and_upload_type_filters()
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for requested_file_type in requested_file_types:
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content_types.extend(files_and_upload_type_filters[requested_file_type])
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return {
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'contentType': {
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'$in': content_types
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}
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}
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def _get_displayname_search_filter_for_mongo(text_search):
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"""
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Return a pymongo query dict for the given search string, using case insensitivity.
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"""
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filters = []
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text_search_tokens = text_search.split()
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for token in text_search_tokens:
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escaped_token = re.escape(token)
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filters.append({
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'displayname': {
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'$regex': escaped_token,
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'$options': 'i',
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},
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})
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return {
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'$and': filters,
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}
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def _get_files_and_upload_type_filters():
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return settings.FILES_AND_UPLOAD_TYPE_FILTERS
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def _get_requested_file_types_from_requested_filter(requested_filter):
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return requested_filter.split(',') if requested_filter else []
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def _get_sort_type_and_direction(request_options):
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sort_type = _get_mongo_sort_from_requested_sort(request_options['requested_sort'])
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sort_direction = _get_sort_direction_from_requested_sort(request_options['requested_sort_direction'])
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return [(sort_type, sort_direction)]
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def _get_mongo_sort_from_requested_sort(requested_sort):
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"""Function returns sorts dataset based on the key provided"""
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if requested_sort == 'date_added':
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sort = 'uploadDate'
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elif requested_sort == 'display_name':
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sort = 'displayname'
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else:
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sort = requested_sort
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return sort
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def _get_sort_direction_from_requested_sort(requested_sort_direction):
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if requested_sort_direction.lower() == 'asc':
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return ASCENDING
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return DESCENDING
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def _get_current_page(requested_page):
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return max(requested_page, 0)
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def _get_first_asset_index(current_page, page_size):
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return current_page * page_size
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def _get_assets_for_page(course_key, options):
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"""returns course content for given course and options"""
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current_page = options['current_page']
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page_size = options['page_size']
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sort = options['sort']
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filter_params = options['filter_params'] if options['filter_params'] else None
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start = current_page * page_size
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return contentstore().get_all_content_for_course(
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course_key, start=start, maxresults=page_size, sort=sort, filter_params=filter_params
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)
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def _update_options_to_requery_final_page(query_options, total_asset_count):
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"""sets current_page value based on asset count and page_size"""
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query_options['current_page'] = int(math.floor((total_asset_count - 1) / query_options['page_size']))
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def _get_assets_in_json_format(assets, course_key):
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"""returns assets information in JSON Format"""
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assets_in_json_format = []
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for asset in assets:
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thumbnail_asset_key = _get_thumbnail_asset_key(asset, course_key)
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asset_is_locked = asset.get('locked', False)
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asset_in_json = _get_asset_json(
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asset['displayname'],
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asset['contentType'],
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asset['uploadDate'],
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asset['asset_key'],
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thumbnail_asset_key,
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asset_is_locked
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)
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assets_in_json_format.append(asset_in_json)
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return assets_in_json_format
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def update_course_run_asset(course_key, upload_file):
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"""returns contents of the uploaded file"""
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course_exists_response = _get_error_if_course_does_not_exist(course_key)
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if course_exists_response is not None:
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return course_exists_response
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file_metadata = _get_file_metadata_as_dictionary(upload_file)
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is_file_too_large = _check_file_size_is_too_large(file_metadata)
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if is_file_too_large:
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error_message = _get_file_too_large_error_message(file_metadata['filename'])
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raise AssetSizeTooLargeException(error_message)
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content, temporary_file_path = _get_file_content_and_path(file_metadata, course_key)
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(thumbnail_content, thumbnail_location) = contentstore().generate_thumbnail(content,
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tempfile_path=temporary_file_path)
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# delete cached thumbnail even if one couldn't be created this time (else the old thumbnail will continue to show)
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del_cached_content(thumbnail_location)
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if _check_thumbnail_uploaded(thumbnail_content):
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content.thumbnail_location = thumbnail_location
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contentstore().save(content)
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del_cached_content(content.location)
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return content
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@require_POST
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@ensure_csrf_cookie
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@login_required
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def _upload_asset(request, course_key):
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"""uploads the file in request and returns JSON response"""
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course_exists_error = _get_error_if_course_does_not_exist(course_key)
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if course_exists_error is not None:
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return course_exists_error
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# compute a 'filename' which is similar to the location formatting, we're
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# using the 'filename' nomenclature since we're using a FileSystem paradigm
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# here. We're just imposing the Location string formatting expectations to
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# keep things a bit more consistent
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upload_file = request.FILES['file']
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try:
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content = update_course_run_asset(course_key, upload_file)
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except AssetSizeTooLargeException as exception:
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return JsonResponse({'error': str(exception)}, status=413)
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# readback the saved content - we need the database timestamp
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readback = contentstore().find(content.location)
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locked = getattr(content, 'locked', False)
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return JsonResponse({
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'asset': _get_asset_json(
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content.name,
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content.content_type,
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readback.last_modified_at,
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content.location,
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content.thumbnail_location,
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locked
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),
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'msg': _('Upload completed')
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})
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def _get_error_if_course_does_not_exist(course_key): # lint-amnesty, pylint: disable=missing-function-docstring
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try:
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modulestore().get_course(course_key)
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except ItemNotFoundError:
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logging.error('Could not find course: %s', course_key)
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return HttpResponseBadRequest()
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def _get_file_metadata_as_dictionary(upload_file): # lint-amnesty, pylint: disable=missing-function-docstring
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# compute a 'filename' which is similar to the location formatting; we're
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# using the 'filename' nomenclature since we're using a FileSystem paradigm
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# here; we're just imposing the Location string formatting expectations to
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# keep things a bit more consistent
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return {
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'upload_file': upload_file,
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'filename': upload_file.name,
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'mime_type': upload_file.content_type,
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'upload_file_size': get_file_size(upload_file)
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}
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def get_file_size(upload_file):
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"""returns the size of the uploaded file"""
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# can be used for mocking test file sizes.
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return upload_file.size
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def _check_file_size_is_too_large(file_metadata):
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"""verifies whether file size is greater than allowed file size"""
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upload_file_size = file_metadata['upload_file_size']
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maximum_file_size_in_megabytes = settings.MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB
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maximum_file_size_in_bytes = maximum_file_size_in_megabytes * 1000 ** 2
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return upload_file_size > maximum_file_size_in_bytes
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def _get_file_too_large_error_message(filename):
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"""returns formatted error message for large files"""
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return _(
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'File {filename} exceeds maximum size of '
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'{maximum_size_in_megabytes} MB.'
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).format(
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filename=filename,
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maximum_size_in_megabytes=settings.MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB,
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)
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def _get_file_content_and_path(file_metadata, course_key):
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"""returns contents of the uploaded file and path for temporary uploaded file"""
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content_location = StaticContent.compute_location(course_key, file_metadata['filename'])
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upload_file = file_metadata['upload_file']
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file_can_be_chunked = upload_file.multiple_chunks()
|
|
|
|
static_content_partial = partial(StaticContent, content_location, file_metadata['filename'],
|
|
file_metadata['mime_type'])
|
|
|
|
if file_can_be_chunked:
|
|
content = static_content_partial(upload_file.chunks())
|
|
temporary_file_path = upload_file.temporary_file_path()
|
|
else:
|
|
content = static_content_partial(upload_file.read())
|
|
temporary_file_path = None
|
|
return content, temporary_file_path
|
|
|
|
|
|
def _check_thumbnail_uploaded(thumbnail_content):
|
|
"""returns whether thumbnail is None"""
|
|
return thumbnail_content is not None
|
|
|
|
|
|
def _get_thumbnail_asset_key(asset, course_key):
|
|
"""returns thumbnail asset key"""
|
|
# note, due to the schema change we may not have a 'thumbnail_location' in the result set
|
|
thumbnail_location = asset.get('thumbnail_location', None)
|
|
thumbnail_asset_key = None
|
|
|
|
if thumbnail_location:
|
|
thumbnail_path = thumbnail_location[4]
|
|
thumbnail_asset_key = course_key.make_asset_key('thumbnail', thumbnail_path)
|
|
return thumbnail_asset_key
|
|
|
|
|
|
@require_http_methods(('DELETE', 'POST', 'PUT'))
|
|
@login_required
|
|
@ensure_csrf_cookie
|
|
def _update_asset(request, course_key, asset_key):
|
|
"""
|
|
restful CRUD operations for a course asset.
|
|
Currently only DELETE, POST, and PUT methods are implemented.
|
|
|
|
asset_path_encoding: the odd /c4x/org/course/category/name repr of the asset (used by Backbone as the id)
|
|
"""
|
|
if request.method == 'DELETE':
|
|
try:
|
|
delete_asset(course_key, asset_key)
|
|
return JsonResponse()
|
|
except AssetNotFoundException:
|
|
return JsonResponse(status=404)
|
|
|
|
elif request.method in ('PUT', 'POST'):
|
|
if 'file' in request.FILES:
|
|
return _upload_asset(request, course_key)
|
|
|
|
# update existing asset
|
|
try:
|
|
modified_asset = json.loads(request.body.decode('utf8'))
|
|
except ValueError:
|
|
return HttpResponseBadRequest()
|
|
contentstore().set_attr(asset_key, 'locked', modified_asset['locked'])
|
|
# delete the asset from the cache so we check the lock status the next time it is requested.
|
|
del_cached_content(asset_key)
|
|
return JsonResponse(modified_asset, status=201)
|
|
|
|
|
|
def _save_content_to_trash(content):
|
|
"""saves the content to trash"""
|
|
contentstore('trashcan').save(content)
|
|
|
|
|
|
def delete_asset(course_key, asset_key):
|
|
"""deletes the cached content based on asset key"""
|
|
content = _check_existence_and_get_asset_content(asset_key)
|
|
|
|
_save_content_to_trash(content)
|
|
|
|
_delete_thumbnail(content.thumbnail_location, course_key, asset_key)
|
|
contentstore().delete(content.get_id())
|
|
del_cached_content(content.location)
|
|
|
|
|
|
def _check_existence_and_get_asset_content(asset_key): # lint-amnesty, pylint: disable=missing-function-docstring
|
|
try:
|
|
content = contentstore().find(asset_key)
|
|
return content
|
|
except NotFoundError:
|
|
raise AssetNotFoundException # lint-amnesty, pylint: disable=raise-missing-from
|
|
|
|
|
|
def _delete_thumbnail(thumbnail_location, course_key, asset_key): # lint-amnesty, pylint: disable=missing-function-docstring
|
|
if thumbnail_location is not None:
|
|
|
|
# We are ignoring the value of the thumbnail_location-- we only care whether
|
|
# or not a thumbnail has been stored, and we can now easily create the correct path.
|
|
thumbnail_location = course_key.make_asset_key('thumbnail', asset_key.block_id)
|
|
|
|
try:
|
|
thumbnail_content = contentstore().find(thumbnail_location)
|
|
_save_content_to_trash(thumbnail_content)
|
|
contentstore().delete(thumbnail_content.get_id())
|
|
del_cached_content(thumbnail_location)
|
|
except Exception: # pylint: disable=broad-except
|
|
logging.warning('Could not delete thumbnail: %s', thumbnail_location)
|
|
|
|
|
|
def _get_asset_json(display_name, content_type, date, location, thumbnail_location, locked):
|
|
'''
|
|
Helper method for formatting the asset information to send to client.
|
|
'''
|
|
asset_url = StaticContent.serialize_asset_key_with_slash(location)
|
|
external_url = urljoin(configuration_helpers.get_value('LMS_ROOT_URL', settings.LMS_ROOT_URL), asset_url)
|
|
return {
|
|
'display_name': display_name,
|
|
'content_type': content_type,
|
|
'date_added': get_default_time_display(date),
|
|
'url': asset_url,
|
|
'external_url': external_url,
|
|
'portable_url': StaticContent.get_static_path_from_location(location),
|
|
'thumbnail': StaticContent.serialize_asset_key_with_slash(thumbnail_location) if thumbnail_location else None,
|
|
'locked': locked,
|
|
# needed for Backbone delete/update.
|
|
'id': str(location)
|
|
}
|