def _preview_module_system(request, descriptor, field_data):
"""
Returns a ModuleSystem for the specified descriptor that is specialized for
rendering module previews.
request: The active django request
descriptor: An XModuleDescriptor
"""
course_id = descriptor.location.course_key
display_name_only = (descriptor.category == 'static_tab')
wrappers = [
# This wrapper wraps the module in the template specified above
partial(wrap_xblock,
'PreviewRuntime',
display_name_only=display_name_only,
usage_id_serializer=unicode,
request_token=request_token(request)),
# This wrapper replaces urls in the output that start with /static
# with the correct course-specific url for the static content
partial(replace_static_urls, None, course_id=course_id),
_studio_wrap_xblock,
]
descriptor.runtime._services[
'studio_user_permissions'] = StudioPermissionsService(request) # pylint: disable=protected-access
return PreviewModuleSystem(
static_url=settings.STATIC_URL,
# TODO (cpennington): Do we want to track how instructors are using the preview problems?
track_function=lambda event_type, event: None,
filestore=descriptor.runtime.resources_fs,
get_module=partial(_load_preview_module, request),
render_template=render_from_lms,
debug=True,
replace_urls=partial(static_replace.replace_static_urls,
data_directory=None,
course_id=course_id),
user=request.user,
can_execute_unsafe_code=(lambda: can_execute_unsafe_code(course_id)),
get_python_lib_zip=(
lambda: get_python_lib_zip(contentstore, course_id)),
mixins=settings.XBLOCK_MIXINS,
course_id=course_id,
anonymous_student_id='student',
# Set up functions to modify the fragment produced by student_view
wrappers=wrappers,
error_descriptor_class=ErrorDescriptor,
get_user_role=lambda: get_user_role(request.user, course_id),
descriptor_runtime=descriptor.runtime,
services={
"i18n": ModuleI18nService(),
"field-data": field_data,
"library_tools": LibraryToolsService(modulestore()),
"user": DjangoXBlockUserService(request.user),
},
)
def get_module_for_descriptor(user, request, descriptor, field_data_cache, course_key,
position=None, wrap_xmodule_display=True, grade_bucket_type=None,
static_asset_path=''):
"""
Implements get_module, extracting out the request-specific functionality.
See get_module() docstring for further details.
"""
track_function = make_track_function(request)
xqueue_callback_url_prefix = get_xqueue_callback_url_prefix(request)
user_location = getattr(request, 'session', {}).get('country_code')
return get_module_for_descriptor_internal(
user=user,
descriptor=descriptor,
field_data_cache=field_data_cache,
course_id=course_key,
track_function=track_function,
xqueue_callback_url_prefix=xqueue_callback_url_prefix,
position=position,
wrap_xmodule_display=wrap_xmodule_display,
grade_bucket_type=grade_bucket_type,
static_asset_path=static_asset_path,
user_location=user_location,
request_token=request_token(request),
)
def _preview_module_system(request, descriptor, field_data):
"""
Returns a ModuleSystem for the specified descriptor that is specialized for
rendering module previews.
request: The active django request
descriptor: An XModuleDescriptor
"""
course_id = descriptor.location.course_key
display_name_only = (descriptor.category == 'static_tab')
wrappers = [
# This wrapper wraps the module in the template specified above
partial(
wrap_xblock,
'PreviewRuntime',
display_name_only=display_name_only,
usage_id_serializer=unicode,
request_token=request_token(request)
),
# This wrapper replaces urls in the output that start with /static
# with the correct course-specific url for the static content
partial(replace_static_urls, None, course_id=course_id),
_studio_wrap_xblock,
]
descriptor.runtime._services['studio_user_permissions'] = StudioPermissionsService(request) # pylint: disable=protected-access
return PreviewModuleSystem(
static_url=settings.STATIC_URL,
# TODO (cpennington): Do we want to track how instructors are using the preview problems?
track_function=lambda event_type, event: None,
filestore=descriptor.runtime.resources_fs,
get_module=partial(_load_preview_module, request),
render_template=render_from_lms,
debug=True,
replace_urls=partial(static_replace.replace_static_urls, data_directory=None, course_id=course_id),
user=request.user,
can_execute_unsafe_code=(lambda: can_execute_unsafe_code(course_id)),
get_python_lib_zip=(lambda: get_python_lib_zip(contentstore, course_id)),
mixins=settings.XBLOCK_MIXINS,
course_id=course_id,
anonymous_student_id='student',
# Set up functions to modify the fragment produced by student_view
wrappers=wrappers,
error_descriptor_class=ErrorDescriptor,
get_user_role=lambda: get_user_role(request.user, course_id),
# Get the raw DescriptorSystem, not the CombinedSystem
descriptor_runtime=descriptor._runtime, # pylint: disable=protected-access
services={
"i18n": ModuleI18nService(),
"field-data": field_data,
"library_tools": LibraryToolsService(modulestore()),
"settings": SettingsService(),
"user": DjangoXBlockUserService(request.user),
},
)
def xblock_view_handler(request, usage_key_string, view_name):
"""
The restful handler for requests for rendered xblock views.
Returns a json object containing two keys:
html: The rendered html of the view
resources: A list of tuples where the first element is the resource hash, and
the second is the resource description
"""
usage_key = usage_key_with_run(usage_key_string)
if not has_course_access(request.user, usage_key.course_key):
raise PermissionDenied()
accept_header = request.META.get('HTTP_ACCEPT', 'application/json')
if 'application/json' in accept_header:
store = modulestore()
xblock = store.get_item(usage_key)
container_views = ['container_preview', 'reorderable_container_child_preview']
# wrap the generated fragment in the xmodule_editor div so that the javascript
# can bind to it correctly
xblock.runtime.wrappers.append(partial(
wrap_xblock,
'StudioRuntime',
usage_id_serializer=unicode,
request_token=request_token(request),
))
if view_name == STUDIO_VIEW:
try:
fragment = xblock.render(STUDIO_VIEW)
# catch exceptions indiscriminately, since after this point they escape the
# dungeon and surface as uneditable, unsaveable, and undeletable
# component-goblins.
except Exception as exc: # pylint: disable=w0703
log.debug("unable to render studio_view for %r", xblock, exc_info=True)
fragment = Fragment(render_to_string('html_error.html', {'message': str(exc)}))
store.update_item(xblock, request.user.id)
elif view_name in (PREVIEW_VIEWS + container_views):
is_pages_view = view_name == STUDENT_VIEW # Only the "Pages" view uses student view in Studio
# Determine the items to be shown as reorderable. Note that the view
# 'reorderable_container_child_preview' is only rendered for xblocks that
# are being shown in a reorderable container, so the xblock is automatically
# added to the list.
reorderable_items = set()
if view_name == 'reorderable_container_child_preview':
reorderable_items.add(xblock.location)
# Set up the context to be passed to each XBlock's render method.
context = {
'is_pages_view': is_pages_view, # This setting disables the recursive wrapping of xblocks
'is_unit_page': is_unit(xblock),
'root_xblock': xblock if (view_name == 'container_preview') else None,
'reorderable_items': reorderable_items
}
fragment = get_preview_fragment(request, xblock, context)
# Note that the container view recursively adds headers into the preview fragment,
# so only the "Pages" view requires that this extra wrapper be included.
if is_pages_view:
fragment.content = render_to_string('component.html', {
'xblock_context': context,
'xblock': xblock,
'locator': usage_key,
'preview': fragment.content,
'label': xblock.display_name or xblock.scope_ids.block_type,
})
else:
raise Http404
hashed_resources = OrderedDict()
for resource in fragment.resources:
hashed_resources[hash_resource(resource)] = resource
return JsonResponse({
'html': fragment.content,
'resources': hashed_resources.items()
})
else:
return HttpResponse(status=406)
def xblock_view_handler(request, usage_key_string, view_name):
"""
The restful handler for requests for rendered xblock views.
Returns a json object containing two keys:
html: The rendered html of the view
resources: A list of tuples where the first element is the resource hash, and
the second is the resource description
"""
usage_key = usage_key_with_run(usage_key_string)
if not has_course_author_access(request.user, usage_key.course_key):
raise PermissionDenied()
accept_header = request.META.get('HTTP_ACCEPT', 'application/json')
if 'application/json' in accept_header:
store = modulestore()
xblock = store.get_item(usage_key)
container_views = [
'container_preview', 'reorderable_container_child_preview'
]
# wrap the generated fragment in the xmodule_editor div so that the javascript
# can bind to it correctly
xblock.runtime.wrappers.append(
partial(
wrap_xblock,
'StudioRuntime',
usage_id_serializer=unicode,
request_token=request_token(request),
))
if view_name == STUDIO_VIEW:
try:
fragment = xblock.render(STUDIO_VIEW)
# catch exceptions indiscriminately, since after this point they escape the
# dungeon and surface as uneditable, unsaveable, and undeletable
# component-goblins.
except Exception as exc: # pylint: disable=broad-except
log.debug("unable to render studio_view for %r",
xblock,
exc_info=True)
fragment = Fragment(
render_to_string('html_error.html', {'message': str(exc)}))
elif view_name in (PREVIEW_VIEWS + container_views):
is_pages_view = view_name == STUDENT_VIEW # Only the "Pages" view uses student view in Studio
# Determine the items to be shown as reorderable. Note that the view
# 'reorderable_container_child_preview' is only rendered for xblocks that
# are being shown in a reorderable container, so the xblock is automatically
# added to the list.
reorderable_items = set()
if view_name == 'reorderable_container_child_preview':
reorderable_items.add(xblock.location)
# Set up the context to be passed to each XBlock's render method.
context = {
'is_pages_view':
is_pages_view, # This setting disables the recursive wrapping of xblocks
'is_unit_page': is_unit(xblock),
'root_xblock': xblock if
(view_name == 'container_preview') else None,
'reorderable_items': reorderable_items
}
fragment = get_preview_fragment(request, xblock, context)
# Note that the container view recursively adds headers into the preview fragment,
# so only the "Pages" view requires that this extra wrapper be included.
if is_pages_view:
fragment.content = render_to_string(
'component.html', {
'xblock_context':
context,
'xblock':
xblock,
'locator':
usage_key,
'preview':
fragment.content,
'label':
xblock.display_name or xblock.scope_ids.block_type,
})
else:
raise Http404
hashed_resources = OrderedDict()
for resource in fragment.resources:
hashed_resources[hash_resource(resource)] = resource
return JsonResponse({
'html': fragment.content,
'resources': hashed_resources.items()
})
else:
return HttpResponse(status=406)
