383 lines
16 KiB
Python
383 lines
16 KiB
Python
"""Views for items (modules)."""
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import logging
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from uuid import uuid4
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from functools import partial
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from static_replace import replace_static_urls
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from xmodule_modifiers import wrap_xblock
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from django.core.exceptions import PermissionDenied
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from django.contrib.auth.decorators import login_required
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from xmodule.modulestore.django import modulestore, loc_mapper
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from xmodule.modulestore.inheritance import own_metadata
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from xmodule.modulestore.exceptions import ItemNotFoundError, InvalidLocationError
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from util.json_request import expect_json, JsonResponse
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from util.string_utils import str_to_bool
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from ..transcripts_utils import manage_video_subtitles_save
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from ..utils import get_modulestore
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from .access import has_access
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from .helpers import _xmodule_recurse
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from xmodule.x_module import XModuleDescriptor
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from django.views.decorators.http import require_http_methods
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from xmodule.modulestore.locator import BlockUsageLocator
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from student.models import CourseEnrollment
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from django.http import HttpResponseBadRequest
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from xblock.fields import Scope
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from preview import handler_prefix, get_preview_html
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from mitxmako.shortcuts import render_to_response, render_to_string
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from models.settings.course_grading import CourseGradingModel
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__all__ = ['orphan_handler', 'xblock_handler']
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log = logging.getLogger(__name__)
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# cdodge: these are categories which should not be parented, they are detached from the hierarchy
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DETACHED_CATEGORIES = ['about', 'static_tab', 'course_info']
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CREATE_IF_NOT_FOUND = ['course_info']
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# pylint: disable=unused-argument
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@require_http_methods(("DELETE", "GET", "PUT", "POST"))
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@login_required
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@expect_json
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def xblock_handler(request, tag=None, course_id=None, branch=None, version_guid=None, block=None):
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"""
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The restful handler for xblock requests.
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DELETE
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json: delete this xblock instance from the course. Supports query parameters "recurse" to delete
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all children and "all_versions" to delete from all (mongo) versions.
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GET
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json: returns representation of the xblock (locator id, data, and metadata).
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if ?fields=graderType, it returns the graderType for the unit instead of the above.
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html: returns HTML for rendering the xblock (which includes both the "preview" view and the "editor" view)
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PUT or POST
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json: if xblock locator is specified, update the xblock instance. The json payload can contain
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these fields, all optional:
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:data: the new value for the data.
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:children: the locator ids of children for this xblock.
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:metadata: new values for the metadata fields. Any whose values are None will be deleted not set
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to None! Absent ones will be left alone.
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:nullout: which metadata fields to set to None
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:graderType: change how this unit is graded
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:publish: can be one of three values, 'make_public, 'make_private', or 'create_draft'
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The JSON representation on the updated xblock (minus children) is returned.
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if xblock locator is not specified, create a new xblock instance. The json playload can contain
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these fields:
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:parent_locator: parent for new xblock, required
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:category: type of xblock, required
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:display_name: name for new xblock, optional
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:boilerplate: template name for populating fields, optional
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The locator (and old-style id) for the created xblock (minus children) is returned.
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"""
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if course_id is not None:
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locator = BlockUsageLocator(course_id=course_id, branch=branch, version_guid=version_guid, usage_id=block)
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if not has_access(request.user, locator):
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raise PermissionDenied()
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old_location = loc_mapper().translate_locator_to_location(locator)
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if request.method == 'GET':
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if 'application/json' in request.META.get('HTTP_ACCEPT', 'application/json'):
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fields = request.REQUEST.get('fields', '').split(',')
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if 'graderType' in fields:
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# right now can't combine output of this w/ output of _get_module_info, but worthy goal
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return JsonResponse(CourseGradingModel.get_section_grader_type(locator))
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# TODO: pass fields to _get_module_info and only return those
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rsp = _get_module_info(locator)
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return JsonResponse(rsp)
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else:
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component = modulestore().get_item(old_location)
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# Wrap the generated fragment in the xmodule_editor div so that the javascript
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# can bind to it correctly
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component.runtime.wrappers.append(partial(wrap_xblock, handler_prefix))
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try:
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content = component.render('studio_view').content
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# catch exceptions indiscriminately, since after this point they escape the
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# dungeon and surface as uneditable, unsaveable, and undeletable
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# component-goblins.
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except Exception as exc: # pylint: disable=W0703
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content = render_to_string('html_error.html', {'message': str(exc)})
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return render_to_response('component.html', {
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'preview': get_preview_html(request, component),
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'editor': content
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})
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elif request.method == 'DELETE':
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delete_children = str_to_bool(request.REQUEST.get('recurse', 'False'))
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delete_all_versions = str_to_bool(request.REQUEST.get('all_versions', 'False'))
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return _delete_item_at_location(old_location, delete_children, delete_all_versions)
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else: # Since we have a course_id, we are updating an existing xblock.
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return _save_item(
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request,
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locator,
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old_location,
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data=request.json.get('data'),
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children=request.json.get('children'),
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metadata=request.json.get('metadata'),
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nullout=request.json.get('nullout'),
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grader_type=request.json.get('graderType'),
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publish=request.json.get('publish'),
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)
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elif request.method in ('PUT', 'POST'):
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return _create_item(request)
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else:
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return HttpResponseBadRequest(
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"Only instance creation is supported without a course_id.",
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content_type="text/plain"
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)
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def _save_item(request, usage_loc, item_location, data=None, children=None, metadata=None, nullout=None,
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grader_type=None, publish=None):
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"""
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Saves xblock w/ its fields. Has special processing for grader_type, publish, and nullout and Nones in metadata.
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nullout means to truly set the field to None whereas nones in metadata mean to unset them (so they revert
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to default).
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The item_location is still the old-style location whereas usage_loc is a BlockUsageLocator
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"""
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store = get_modulestore(item_location)
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try:
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existing_item = store.get_item(item_location)
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except ItemNotFoundError:
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if item_location.category in CREATE_IF_NOT_FOUND:
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# New module at this location, for pages that are not pre-created.
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# Used for course info handouts.
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store.create_and_save_xmodule(item_location)
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existing_item = store.get_item(item_location)
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else:
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raise
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except InvalidLocationError:
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log.error("Can't find item by location.")
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return JsonResponse({"error": "Can't find item by location: " + str(item_location)}, 404)
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if publish:
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if publish == 'make_private':
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_xmodule_recurse(existing_item, lambda i: modulestore().unpublish(i.location))
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elif publish == 'create_draft':
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# This clones the existing item location to a draft location (the draft is
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# implicit, because modulestore is a Draft modulestore)
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modulestore().convert_to_draft(item_location)
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if data:
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store.update_item(item_location, data)
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else:
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data = existing_item.get_explicitly_set_fields_by_scope(Scope.content)
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if children is not None:
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children_ids = [
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loc_mapper().translate_locator_to_location(BlockUsageLocator(child_locator)).url()
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for child_locator
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in children
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]
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store.update_children(item_location, children_ids)
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# cdodge: also commit any metadata which might have been passed along
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if nullout is not None or metadata is not None:
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# the postback is not the complete metadata, as there's system metadata which is
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# not presented to the end-user for editing. So let's use the original (existing_item) and
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# 'apply' the submitted metadata, so we don't end up deleting system metadata.
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if nullout is not None:
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for metadata_key in nullout:
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setattr(existing_item, metadata_key, None)
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# update existing metadata with submitted metadata (which can be partial)
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# IMPORTANT NOTE: if the client passed 'null' (None) for a piece of metadata that means 'remove it'. If
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# the intent is to make it None, use the nullout field
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if metadata is not None:
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for metadata_key, value in metadata.items():
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field = existing_item.fields[metadata_key]
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if value is None:
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field.delete_from(existing_item)
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else:
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try:
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value = field.from_json(value)
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except ValueError:
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return JsonResponse({"error": "Invalid data"}, 400)
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field.write_to(existing_item, value)
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# Save the data that we've just changed to the underlying
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# MongoKeyValueStore before we update the mongo datastore.
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existing_item.save()
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# commit to datastore
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store.update_metadata(item_location, own_metadata(existing_item))
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if existing_item.category == 'video':
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manage_video_subtitles_save(existing_item, existing_item)
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result = {
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'id': unicode(usage_loc),
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'data': data,
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'metadata': own_metadata(existing_item)
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}
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if grader_type is not None:
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result.update(CourseGradingModel.update_section_grader_type(existing_item, grader_type))
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# Make public after updating the xblock, in case the caller asked
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# for both an update and a publish.
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if publish and publish == 'make_public':
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_xmodule_recurse(
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existing_item,
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lambda i: modulestore().publish(i.location, request.user.id)
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)
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# Note that children aren't being returned until we have a use case.
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return JsonResponse(result)
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@login_required
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@expect_json
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def _create_item(request):
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"""View for create items."""
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parent_locator = BlockUsageLocator(request.json['parent_locator'])
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parent_location = loc_mapper().translate_locator_to_location(parent_locator)
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category = request.json['category']
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display_name = request.json.get('display_name')
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if not has_access(request.user, parent_location):
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raise PermissionDenied()
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parent = get_modulestore(category).get_item(parent_location)
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dest_location = parent_location.replace(category=category, name=uuid4().hex)
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# get the metadata, display_name, and definition from the request
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metadata = {}
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data = None
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template_id = request.json.get('boilerplate')
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if template_id is not None:
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clz = XModuleDescriptor.load_class(category)
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if clz is not None:
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template = clz.get_template(template_id)
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if template is not None:
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metadata = template.get('metadata', {})
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data = template.get('data')
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if display_name is not None:
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metadata['display_name'] = display_name
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get_modulestore(category).create_and_save_xmodule(
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dest_location,
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definition_data=data,
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metadata=metadata,
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system=parent.system,
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)
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if category not in DETACHED_CATEGORIES:
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get_modulestore(parent.location).update_children(parent_location, parent.children + [dest_location.url()])
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course_location = loc_mapper().translate_locator_to_location(parent_locator, get_course=True)
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locator = loc_mapper().translate_location(course_location.course_id, dest_location, False, True)
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return JsonResponse({"locator": unicode(locator)})
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def _delete_item_at_location(item_location, delete_children=False, delete_all_versions=False):
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"""
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Deletes the item at with the given Location.
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It is assumed that course permissions have already been checked.
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"""
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store = get_modulestore(item_location)
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item = store.get_item(item_location)
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if delete_children:
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_xmodule_recurse(item, lambda i: store.delete_item(i.location, delete_all_versions))
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else:
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store.delete_item(item.location, delete_all_versions)
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# cdodge: we need to remove our parent's pointer to us so that it is no longer dangling
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if delete_all_versions:
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parent_locs = modulestore('direct').get_parent_locations(item_location, None)
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for parent_loc in parent_locs:
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parent = modulestore('direct').get_item(parent_loc)
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item_url = item_location.url()
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if item_url in parent.children:
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children = parent.children
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children.remove(item_url)
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parent.children = children
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modulestore('direct').update_children(parent.location, parent.children)
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return JsonResponse()
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# pylint: disable=W0613
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@login_required
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@require_http_methods(("GET", "DELETE"))
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def orphan_handler(request, tag=None, course_id=None, branch=None, version_guid=None, block=None):
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"""
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View for handling orphan related requests. GET gets all of the current orphans.
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DELETE removes all orphans (requires is_staff access)
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An orphan is a block whose category is not in the DETACHED_CATEGORY list, is not the root, and is not reachable
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from the root via children
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:param request:
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:param course_id: Locator syntax course_id
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"""
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location = BlockUsageLocator(course_id=course_id, branch=branch, version_guid=version_guid, usage_id=block)
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# DHM: when split becomes back-end, move or conditionalize this conversion
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old_location = loc_mapper().translate_locator_to_location(location)
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if request.method == 'GET':
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if has_access(request.user, old_location):
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return JsonResponse(modulestore().get_orphans(old_location, DETACHED_CATEGORIES, 'draft'))
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else:
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raise PermissionDenied()
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if request.method == 'DELETE':
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if request.user.is_staff:
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items = modulestore().get_orphans(old_location, DETACHED_CATEGORIES, 'draft')
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for item in items:
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modulestore('draft').delete_item(item, True)
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return JsonResponse({'deleted': items})
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else:
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raise PermissionDenied()
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def _get_module_info(usage_loc, rewrite_static_links=True):
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"""
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metadata, data, id representation of a leaf module fetcher.
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:param usage_loc: A BlockUsageLocator
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"""
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old_location = loc_mapper().translate_locator_to_location(usage_loc)
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store = get_modulestore(old_location)
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try:
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module = store.get_item(old_location)
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except ItemNotFoundError:
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if old_location.category in CREATE_IF_NOT_FOUND:
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# Create a new one for certain categories only. Used for course info handouts.
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store.create_and_save_xmodule(old_location)
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module = store.get_item(old_location)
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else:
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raise
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data = module.data
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if rewrite_static_links:
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# we pass a partially bogus course_id as we don't have the RUN information passed yet
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# through the CMS. Also the contentstore is also not RUN-aware at this point in time.
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data = replace_static_urls(
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module.data,
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None,
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course_id=module.location.org + '/' + module.location.course + '/BOGUS_RUN_REPLACE_WHEN_AVAILABLE'
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)
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# Note that children aren't being returned until we have a use case.
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return {
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'id': unicode(usage_loc),
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'data': data,
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'metadata': own_metadata(module)
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}
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