272 lines
12 KiB
Python
272 lines
12 KiB
Python
"""
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Functions that can are used to modify XBlock fragments for use in the LMS and Studio
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"""
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import datetime
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import json
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import logging
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import static_replace
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import uuid
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from django.conf import settings
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from django.utils.timezone import UTC
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from edxmako.shortcuts import render_to_string
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from xblock.exceptions import InvalidScopeError
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from xblock.fragment import Fragment
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from xmodule.seq_module import SequenceModule
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from xmodule.vertical_module import VerticalModule
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from xmodule.x_module import shim_xmodule_js, XModuleDescriptor, XModule, PREVIEW_VIEWS, STUDIO_VIEW
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from xmodule.modulestore import ModuleStoreEnum
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from xmodule.modulestore.django import modulestore
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log = logging.getLogger(__name__)
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def wrap_fragment(fragment, new_content):
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"""
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Returns a new Fragment that has `new_content` and all
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as its content, and all of the resources from fragment
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"""
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wrapper_frag = Fragment(content=new_content)
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wrapper_frag.add_frag_resources(fragment)
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return wrapper_frag
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def request_token(request):
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"""
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Return a unique token for the supplied request.
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This token will be the same for all calls to `request_token`
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made on the same request object.
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"""
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if not hasattr(request, '_xblock_token'):
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request._xblock_token = uuid.uuid1().get_hex()
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return request._xblock_token
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def wrap_xblock(runtime_class, block, view, frag, context, usage_id_serializer, request_token, display_name_only=False, extra_data=None): # pylint: disable=unused-argument
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"""
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Wraps the results of rendering an XBlock view in a standard <section> with identifying
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data so that the appropriate javascript module can be loaded onto it.
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:param runtime_class: The name of the javascript runtime class to use to load this block
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:param block: An XBlock (that may be an XModule or XModuleDescriptor)
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:param view: The name of the view that rendered the fragment being wrapped
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:param frag: The :class:`Fragment` to be wrapped
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:param context: The context passed to the view being rendered
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:param usage_id_serializer: A function to serialize the block's usage_id for use by the
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front-end Javascript Runtime.
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:param request_token: An identifier that is unique per-request, so that only xblocks
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rendered as part of this request will have their javascript initialized.
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:param display_name_only: If true, don't render the fragment content at all.
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Instead, just render the `display_name` of `block`
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:param extra_data: A dictionary with extra data values to be set on the wrapper
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"""
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if extra_data is None:
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extra_data = {}
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# If any mixins have been applied, then use the unmixed class
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class_name = getattr(block, 'unmixed_class', block.__class__).__name__
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data = {}
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data.update(extra_data)
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css_classes = ['xblock', 'xblock-{}'.format(view)]
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if isinstance(block, (XModule, XModuleDescriptor)):
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if view in PREVIEW_VIEWS:
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# The block is acting as an XModule
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css_classes.append('xmodule_display')
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elif view == STUDIO_VIEW:
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# The block is acting as an XModuleDescriptor
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css_classes.append('xmodule_edit')
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css_classes.append('xmodule_' + class_name)
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data['type'] = block.js_module_name
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shim_xmodule_js(frag)
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if frag.js_init_fn:
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data['init'] = frag.js_init_fn
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data['runtime-class'] = runtime_class
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data['runtime-version'] = frag.js_init_version
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data['block-type'] = block.scope_ids.block_type
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data['usage-id'] = usage_id_serializer(block.scope_ids.usage_id)
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data['request-token'] = request_token
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template_context = {
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'content': block.display_name if display_name_only else frag.content,
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'classes': css_classes,
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'display_name': block.display_name_with_default,
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'data_attributes': u' '.join(u'data-{}="{}"'.format(key, value)
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for key, value in data.iteritems()),
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}
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if hasattr(frag, 'json_init_args') and frag.json_init_args is not None:
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template_context['js_init_parameters'] = json.dumps(frag.json_init_args)
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template_context['js_pass_parameters'] = True
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else:
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template_context['js_init_parameters'] = ""
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template_context['js_pass_parameters'] = False
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return wrap_fragment(frag, render_to_string('xblock_wrapper.html', template_context))
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def replace_jump_to_id_urls(course_id, jump_to_id_base_url, block, view, frag, context): # pylint: disable=unused-argument
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"""
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This will replace a link between courseware in the format
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/jump_to/<id> with a URL for a page that will correctly redirect
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This is similar to replace_course_urls, but much more flexible and
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durable for Studio authored courses. See more comments in static_replace.replace_jump_to_urls
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course_id: The course_id in which this rewrite happens
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jump_to_id_base_url:
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A app-tier (e.g. LMS) absolute path to the base of the handler that will perform the
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redirect. e.g. /courses/<org>/<course>/<run>/jump_to_id. NOTE the <id> will be appended to
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the end of this URL at re-write time
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output: a new :class:`~xblock.fragment.Fragment` that modifies `frag` with
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content that has been update with /jump_to links replaced
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"""
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return wrap_fragment(frag, static_replace.replace_jump_to_id_urls(frag.content, course_id, jump_to_id_base_url))
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def replace_course_urls(course_id, block, view, frag, context): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the old get_html function and substitutes urls of the form /course/...
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with urls that are /courses/<course_id>/...
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"""
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return wrap_fragment(frag, static_replace.replace_course_urls(frag.content, course_id))
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def replace_static_urls(data_dir, block, view, frag, context, course_id=None, static_asset_path=''): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the old get_html function and substitutes urls of the form /static/...
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with urls that are /static/<prefix>/...
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"""
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return wrap_fragment(frag, static_replace.replace_static_urls(
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frag.content,
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data_dir,
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course_id,
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static_asset_path=static_asset_path
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))
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def grade_histogram(module_id):
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'''
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Print out a histogram of grades on a given problem in staff member debug info.
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Warning: If a student has just looked at an xmodule and not attempted
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it, their grade is None. Since there will always be at least one such student
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this function almost always returns [].
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'''
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from django.db import connection
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cursor = connection.cursor()
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q = """SELECT courseware_studentmodule.grade,
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COUNT(courseware_studentmodule.student_id)
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FROM courseware_studentmodule
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WHERE courseware_studentmodule.module_id=%s
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GROUP BY courseware_studentmodule.grade"""
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# Passing module_id this way prevents sql-injection.
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cursor.execute(q, [module_id.to_deprecated_string()])
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grades = list(cursor.fetchall())
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grades.sort(key=lambda x: x[0]) # Add ORDER BY to sql query?
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if len(grades) >= 1 and grades[0][0] is None:
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return []
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return grades
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def add_staff_markup(user, has_instructor_access, block, view, frag, context): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the output of the old get_html function with additional information
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for admin users only, including a histogram of student answers, the
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definition of the xmodule, and a link to view the module in Studio
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if it is a Studio edited, mongo stored course.
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Does nothing if module is a SequenceModule.
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"""
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# TODO: make this more general, eg use an XModule attribute instead
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if isinstance(block, VerticalModule) and (not context or not context.get('child_of_vertical', False)):
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# check that the course is a mongo backed Studio course before doing work
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is_mongo_course = modulestore().get_modulestore_type(block.location.course_key) != ModuleStoreEnum.Type.xml
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is_studio_course = block.course_edit_method == "Studio"
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if is_studio_course and is_mongo_course:
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# build edit link to unit in CMS. Can't use reverse here as lms doesn't load cms's urls.py
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edit_link = "//" + settings.CMS_BASE + '/container/' + unicode(block.location)
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# return edit link in rendered HTML for display
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return wrap_fragment(frag, render_to_string("edit_unit_link.html", {'frag_content': frag.content, 'edit_link': edit_link}))
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else:
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return frag
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if isinstance(block, SequenceModule):
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return frag
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block_id = block.location
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if block.has_score and settings.FEATURES.get('DISPLAY_HISTOGRAMS_TO_STAFF'):
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histogram = grade_histogram(block_id)
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render_histogram = len(histogram) > 0
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else:
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histogram = None
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render_histogram = False
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if settings.FEATURES.get('ENABLE_LMS_MIGRATION') and hasattr(block.runtime, 'filestore'):
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[filepath, filename] = getattr(block, 'xml_attributes', {}).get('filename', ['', None])
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osfs = block.runtime.filestore
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if filename is not None and osfs.exists(filename):
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# if original, unmangled filename exists then use it (github
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# doesn't like symlinks)
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filepath = filename
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data_dir = block.static_asset_path or osfs.root_path.rsplit('/')[-1]
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giturl = block.giturl or 'https://github.com/MITx'
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edit_link = "%s/%s/tree/master/%s" % (giturl, data_dir, filepath)
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else:
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edit_link = False
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# Need to define all the variables that are about to be used
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giturl = ""
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data_dir = ""
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source_file = block.source_file # source used to generate the problem XML, eg latex or word
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# useful to indicate to staff if problem has been released or not
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# TODO (ichuang): use _has_access_descriptor.can_load in lms.courseware.access, instead of now>mstart comparison here
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now = datetime.datetime.now(UTC())
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is_released = "unknown"
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mstart = block.start
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if mstart is not None:
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is_released = "<font color='red'>Yes!</font>" if (now > mstart) else "<font color='green'>Not yet</font>"
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field_contents = []
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for name, field in block.fields.items():
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try:
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field_contents.append((name, field.read_from(block)))
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except InvalidScopeError:
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log.warning("Unable to read field in Staff Debug information", exc_info=True)
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field_contents.append((name, "WARNING: Unable to read field"))
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staff_context = {'fields': field_contents,
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'xml_attributes': getattr(block, 'xml_attributes', {}),
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'location': block.location,
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'xqa_key': block.xqa_key,
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'source_file': source_file,
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'source_url': '%s/%s/tree/master/%s' % (giturl, data_dir, source_file),
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'category': str(block.__class__.__name__),
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# Template uses element_id in js function names, so can't allow dashes
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'element_id': block.location.html_id().replace('-', '_'),
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'edit_link': edit_link,
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'user': user,
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'xqa_server': settings.FEATURES.get('USE_XQA_SERVER', 'http://xqa:server@content-qa.mitx.mit.edu/xqa'),
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'histogram': json.dumps(histogram),
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'render_histogram': render_histogram,
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'block_content': frag.content,
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'is_released': is_released,
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'has_instructor_access': has_instructor_access,
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}
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return wrap_fragment(frag, render_to_string("staff_problem_info.html", staff_context))
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