609 lines
26 KiB
Python
609 lines
26 KiB
Python
import logging
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import urllib
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from functools import partial
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from django.conf import settings
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from django.core.context_processors import csrf
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from django.core.urlresolvers import reverse
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from django.contrib.auth.models import User
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from django.contrib.auth.decorators import login_required
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from django.http import Http404, HttpResponseRedirect
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from django.shortcuts import redirect
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from mitxmako.shortcuts import render_to_response, render_to_string
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#from django.views.decorators.csrf import ensure_csrf_cookie
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from django_future.csrf import ensure_csrf_cookie
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from django.views.decorators.cache import cache_control
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from courseware import grades
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from courseware.access import has_access
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from courseware.courses import (get_courses, get_course_with_access,
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get_courses_by_university, sort_by_announcement)
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import courseware.tabs as tabs
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from courseware.models import StudentModule, StudentModuleCache
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from module_render import toc_for_course, get_module, get_instance_module, get_module_for_descriptor
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from django_comment_client.utils import get_discussion_title
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from student.models import UserTestGroup, CourseEnrollment
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from util.cache import cache, cache_if_anonymous
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from xmodule.modulestore import Location
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from xmodule.modulestore.django import modulestore
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from xmodule.modulestore.exceptions import InvalidLocationError, ItemNotFoundError, NoPathToItem
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from xmodule.modulestore.search import path_to_location
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import comment_client
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log = logging.getLogger("mitx.courseware")
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template_imports = {'urllib': urllib}
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def user_groups(user):
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"""
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TODO (vshnayder): This is not used. When we have a new plan for groups, adjust appropriately.
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"""
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if not user.is_authenticated():
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return []
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# TODO: Rewrite in Django
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key = 'user_group_names_{user.id}'.format(user=user)
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cache_expiration = 60 * 60 # one hour
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# Kill caching on dev machines -- we switch groups a lot
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group_names = cache.get(key)
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if settings.DEBUG:
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group_names = None
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if group_names is None:
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group_names = [u.name for u in UserTestGroup.objects.filter(users=user)]
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cache.set(key, group_names, cache_expiration)
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return group_names
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@ensure_csrf_cookie
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@cache_if_anonymous
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def courses(request):
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'''
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Render "find courses" page. The course selection work is done in courseware.courses.
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'''
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courses = get_courses(request.user, request.META.get('HTTP_HOST'))
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courses = sort_by_announcement(courses)
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return render_to_response("courseware/courses.html", {'courses': courses})
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def render_accordion(request, course, chapter, section):
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''' Draws navigation bar. Takes current position in accordion as
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parameter.
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If chapter and section are '' or None, renders a default accordion.
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course, chapter, and section are the url_names.
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Returns the html string'''
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# grab the table of contents
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toc = toc_for_course(request.user, request, course, chapter, section)
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context = dict([('toc', toc),
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('course_id', course.id),
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('csrf', csrf(request)['csrf_token'])] + template_imports.items())
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return render_to_string('courseware/accordion.html', context)
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def get_current_child(xmodule):
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"""
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Get the xmodule.position's display item of an xmodule that has a position and
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children. Returns None if the xmodule doesn't have a position, or if there
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are no children. Otherwise, if position is out of bounds, returns the first child.
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"""
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if not hasattr(xmodule, 'position'):
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return None
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children = xmodule.get_display_items()
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# position is 1-indexed.
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if 0 <= xmodule.position - 1 < len(children):
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child = children[xmodule.position - 1]
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elif len(children) > 0:
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# Something is wrong. Default to first child
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child = children[0]
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else:
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child = None
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return child
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def redirect_to_course_position(course_module, first_time):
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"""
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Load the course state for the user, and return a redirect to the
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appropriate place in the course: either the first element if there
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is no state, or their previous place if there is.
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If this is the user's first time, send them to the first section instead.
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"""
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course_id = course_module.descriptor.id
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chapter = get_current_child(course_module)
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if chapter is None:
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# oops. Something bad has happened.
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raise Http404
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if not first_time:
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return redirect(reverse('courseware_chapter', kwargs={'course_id': course_id,
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'chapter': chapter.url_name}))
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# Relying on default of returning first child
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section = get_current_child(chapter)
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return redirect(reverse('courseware_section', kwargs={'course_id': course_id,
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'chapter': chapter.url_name,
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'section': section.url_name}))
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def save_child_position(seq_module, child_name, instance_module):
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"""
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child_name: url_name of the child
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instance_module: the StudentModule object for the seq_module
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"""
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for i, c in enumerate(seq_module.get_display_items()):
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if c.url_name == child_name:
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# Position is 1-indexed
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position = i + 1
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# Only save if position changed
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if position != seq_module.position:
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seq_module.position = position
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instance_module.state = seq_module.get_instance_state()
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instance_module.save()
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def check_for_active_timelimit_module(request, course_id, course):
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'''
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Looks for a timing module for the given user and course that is currently active.
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If found, returns a context dict with timer-related values to enable display of time remaining.
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'''
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context = {}
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timelimit_student_modules = StudentModule.objects.filter(student=request.user, course_id=course_id, module_type='timelimit')
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if timelimit_student_modules:
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for timelimit_student_module in timelimit_student_modules:
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# get the corresponding section_descriptor for the given StudentModel entry:
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module_state_key = timelimit_student_module.module_state_key
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timelimit_descriptor = modulestore().get_instance(course_id, Location(module_state_key))
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timelimit_module_cache = StudentModuleCache.cache_for_descriptor_descendents(course.id, request.user,
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timelimit_descriptor, depth=None)
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timelimit_module = get_module_for_descriptor(request.user, request, timelimit_descriptor,
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timelimit_module_cache, course.id, position=None)
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if timelimit_module is not None and timelimit_module.category == 'timelimit' and \
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timelimit_module.has_begun and not timelimit_module.has_ended:
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location = timelimit_module.location
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# determine where to go when the timer expires:
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if 'time_expired_redirect_url' not in timelimit_descriptor.metadata:
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raise Http404("No {0} metadata at this location: {1} ".format('time_expired_redirect_url', location))
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time_expired_redirect_url = timelimit_descriptor.metadata.get('time_expired_redirect_url')
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context['time_expired_redirect_url'] = time_expired_redirect_url
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# Fetch the remaining time relative to the end time as stored in the module when it was started.
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# This value should be in milliseconds.
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remaining_time = timelimit_module.get_remaining_time_in_ms()
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context['timer_expiration_duration'] = remaining_time
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if 'suppress_toplevel_navigation' in timelimit_descriptor.metadata:
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context['suppress_toplevel_navigation'] = timelimit_descriptor.metadata['suppress_toplevel_navigation']
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return_url = reverse('jump_to', kwargs={'course_id':course_id, 'location':location})
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context['timer_navigation_return_url'] = return_url
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return context
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def update_timelimit_module(user, course_id, student_module_cache, timelimit_descriptor, timelimit_module):
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'''
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Updates the state of the provided timing module, starting it if it hasn't begun.
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Returns dict with timer-related values to enable display of time remaining.
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Returns 'timer_expiration_duration' in dict if timer is still active, and not if timer has expired.
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'''
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context = {}
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# determine where to go when the exam ends:
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if 'time_expired_redirect_url' not in timelimit_descriptor.metadata:
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raise Http404("No {0} metadata at this location: {1} ".format('time_expired_redirect_url', timelimit_module.location))
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time_expired_redirect_url = timelimit_descriptor.metadata.get('time_expired_redirect_url')
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context['time_expired_redirect_url'] = time_expired_redirect_url
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if not timelimit_module.has_ended:
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if not timelimit_module.has_begun:
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# user has not started the exam, so start it now.
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if 'duration' not in timelimit_descriptor.metadata:
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raise Http404("No {0} metadata at this location: {1} ".format('duration', timelimit_module.location))
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# The user may have an accommodation that has been granted to them.
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# This accommodation information should already be stored in the module's state.
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duration = int(timelimit_descriptor.metadata.get('duration'))
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timelimit_module.begin(duration)
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# we have changed state, so we need to persist the change:
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instance_module = get_instance_module(course_id, user, timelimit_module, student_module_cache)
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instance_module.state = timelimit_module.get_instance_state()
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instance_module.save()
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# the exam has been started, either because the student is returning to the
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# exam page, or because they have just visited it. Fetch the remaining time relative to the
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# end time as stored in the module when it was started.
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context['timer_expiration_duration'] = timelimit_module.get_remaining_time_in_ms()
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# also use the timed module to determine whether top-level navigation is visible:
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if 'suppress_toplevel_navigation' in timelimit_descriptor.metadata:
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context['suppress_toplevel_navigation'] = timelimit_descriptor.metadata['suppress_toplevel_navigation']
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return context
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@login_required
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@ensure_csrf_cookie
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@cache_control(no_cache=True, no_store=True, must_revalidate=True)
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def index(request, course_id, chapter=None, section=None,
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position=None):
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"""
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Displays courseware accordion and associated content. If course, chapter,
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and section are all specified, renders the page, or returns an error if they
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are invalid.
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If section is not specified, displays the accordion opened to the right chapter.
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If neither chapter or section are specified, redirects to user's most recent
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chapter, or the first chapter if this is the user's first visit.
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Arguments:
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- request : HTTP request
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- course_id : course id (str: ORG/course/URL_NAME)
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- chapter : chapter url_name (str)
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- section : section url_name (str)
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- position : position in module, eg of <sequential> module (str)
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Returns:
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- HTTPresponse
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"""
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course = get_course_with_access(request.user, course_id, 'load', depth=2)
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staff_access = has_access(request.user, course, 'staff')
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registered = registered_for_course(course, request.user)
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if not registered:
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# TODO (vshnayder): do course instructors need to be registered to see course?
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log.debug('User %s tried to view course %s but is not enrolled' % (request.user, course.location.url()))
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return redirect(reverse('about_course', args=[course.id]))
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try:
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student_module_cache = StudentModuleCache.cache_for_descriptor_descendents(
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course.id, request.user, course, depth=2)
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# Has this student been in this course before?
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first_time = student_module_cache.lookup(course_id, 'course', course.location.url()) is None
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# Load the module for the course
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course_module = get_module_for_descriptor(request.user, request, course, student_module_cache, course.id)
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if course_module is None:
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log.warning('If you see this, something went wrong: if we got this'
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' far, should have gotten a course module for this user')
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return redirect(reverse('about_course', args=[course.id]))
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if chapter is None:
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return redirect_to_course_position(course_module, first_time)
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context = {
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'csrf': csrf(request)['csrf_token'],
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'accordion': render_accordion(request, course, chapter, section),
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'COURSE_TITLE': course.title,
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'course': course,
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'init': '',
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'content': '',
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'staff_access': staff_access,
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'xqa_server': settings.MITX_FEATURES.get('USE_XQA_SERVER', 'http://xqa:server@content-qa.mitx.mit.edu/xqa')
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}
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chapter_descriptor = course.get_child_by(lambda m: m.url_name == chapter)
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if chapter_descriptor is not None:
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instance_module = get_instance_module(course_id, request.user, course_module, student_module_cache)
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save_child_position(course_module, chapter, instance_module)
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else:
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raise Http404('No chapter descriptor found with name {}'.format(chapter))
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chapter_module = course_module.get_child_by(lambda m: m.url_name == chapter)
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if chapter_module is None:
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# User may be trying to access a chapter that isn't live yet
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raise Http404
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if section is not None:
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section_descriptor = chapter_descriptor.get_child_by(lambda m: m.url_name == section)
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if section_descriptor is None:
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# Specifically asked-for section doesn't exist
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raise Http404
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# Load all descendants of the section, because we're going to display its
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# html, which in general will need all of its children
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section_module_cache = StudentModuleCache.cache_for_descriptor_descendents(
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course.id, request.user, section_descriptor, depth=None)
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section_module = get_module(request.user, request, section_descriptor.location,
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section_module_cache, course.id, position=position, depth=None)
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if section_module is None:
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# User may be trying to be clever and access something
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# they don't have access to.
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raise Http404
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# Save where we are in the chapter
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instance_module = get_instance_module(course_id, request.user, chapter_module, student_module_cache)
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save_child_position(chapter_module, section, instance_module)
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# check here if this section *is* a timed module.
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if section_module.category == 'timelimit':
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timer_context = update_timelimit_module(request.user, course_id, student_module_cache,
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section_descriptor, section_module)
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if 'timer_expiration_duration' in timer_context:
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context.update(timer_context)
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else:
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# if there is no expiration defined, then we know the timer has expired:
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return HttpResponseRedirect(timer_context['time_expired_redirect_url'])
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else:
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# check here if this page is within a course that has an active timed module running. If so, then
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# add in the appropriate timer information to the rendering context:
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context.update(check_for_active_timelimit_module(request, course_id, course))
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context['content'] = section_module.get_html()
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else:
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# section is none, so display a message
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prev_section = get_current_child(chapter_module)
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if prev_section is None:
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# Something went wrong -- perhaps this chapter has no sections visible to the user
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raise Http404
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prev_section_url = reverse('courseware_section', kwargs={'course_id': course_id,
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'chapter': chapter_descriptor.url_name,
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'section': prev_section.url_name})
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context['content'] = render_to_string('courseware/welcome-back.html',
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{'course': course,
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'chapter_module': chapter_module,
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'prev_section': prev_section,
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'prev_section_url': prev_section_url})
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result = render_to_response('courseware/courseware.html', context)
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except Exception as e:
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if isinstance(e, Http404):
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# let it propagate
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raise
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# In production, don't want to let a 500 out for any reason
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if settings.DEBUG:
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raise
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else:
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log.exception("Error in index view: user={user}, course={course},"
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" chapter={chapter} section={section}"
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"position={position}".format(
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user=request.user,
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course=course,
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chapter=chapter,
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section=section,
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position=position
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))
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try:
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result = render_to_response('courseware/courseware-error.html',
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{'staff_access': staff_access,
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'course': course})
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except:
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# Let the exception propagate, relying on global config to at
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# at least return a nice error message
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log.exception("Error while rendering courseware-error page")
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raise
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return result
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@ensure_csrf_cookie
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def jump_to(request, course_id, location):
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'''
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Show the page that contains a specific location.
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If the location is invalid or not in any class, return a 404.
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Otherwise, delegates to the index view to figure out whether this user
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has access, and what they should see.
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'''
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# Complain if the location isn't valid
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try:
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location = Location(location)
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except InvalidLocationError:
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raise Http404("Invalid location")
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# Complain if there's not data for this location
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try:
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(course_id, chapter, section, position) = path_to_location(modulestore(), course_id, location)
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except ItemNotFoundError:
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raise Http404("No data at this location: {0}".format(location))
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except NoPathToItem:
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raise Http404("This location is not in any class: {0}".format(location))
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# choose the appropriate view (and provide the necessary args) based on the
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# args provided by the redirect.
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# Rely on index to do all error handling and access control.
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if chapter is None:
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return redirect('courseware', course_id=course_id)
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elif section is None:
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return redirect('courseware_chapter', course_id=course_id, chapter=chapter)
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elif position is None:
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return redirect('courseware_section', course_id=course_id, chapter=chapter, section=section)
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else:
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return redirect('courseware_position', course_id=course_id, chapter=chapter, section=section, position=position)
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@ensure_csrf_cookie
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def course_info(request, course_id):
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"""
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Display the course's info.html, or 404 if there is no such course.
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Assumes the course_id is in a valid format.
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"""
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course = get_course_with_access(request.user, course_id, 'load')
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staff_access = has_access(request.user, course, 'staff')
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return render_to_response('courseware/info.html', {'request': request, 'course_id': course_id, 'cache': None,
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'course': course, 'staff_access': staff_access})
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@ensure_csrf_cookie
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def static_tab(request, course_id, tab_slug):
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"""
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Display the courses tab with the given name.
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Assumes the course_id is in a valid format.
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"""
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course = get_course_with_access(request.user, course_id, 'load')
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tab = tabs.get_static_tab_by_slug(course, tab_slug)
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if tab is None:
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raise Http404
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contents = tabs.get_static_tab_contents(request, None, course, tab)
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if contents is None:
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raise Http404
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staff_access = has_access(request.user, course, 'staff')
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return render_to_response('courseware/static_tab.html',
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{'course': course,
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'tab': tab,
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'tab_contents': contents,
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'staff_access': staff_access, })
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# TODO arjun: remove when custom tabs in place, see courseware/syllabus.py
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@ensure_csrf_cookie
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def syllabus(request, course_id):
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"""
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Display the course's syllabus.html, or 404 if there is no such course.
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Assumes the course_id is in a valid format.
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"""
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course = get_course_with_access(request.user, course_id, 'load')
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staff_access = has_access(request.user, course, 'staff')
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return render_to_response('courseware/syllabus.html', {'course': course,
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'staff_access': staff_access, })
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def registered_for_course(course, user):
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'''Return CourseEnrollment if user is registered for course, else False'''
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if user is None:
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return False
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if user.is_authenticated():
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return CourseEnrollment.objects.filter(user=user, course_id=course.id).exists()
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else:
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return False
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@ensure_csrf_cookie
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@cache_if_anonymous
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def course_about(request, course_id):
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course = get_course_with_access(request.user, course_id, 'see_exists')
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registered = registered_for_course(course, request.user)
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if has_access(request.user, course, 'load'):
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course_target = reverse('info', args=[course.id])
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else:
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course_target = reverse('about_course', args=[course.id])
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show_courseware_link = (has_access(request.user, course, 'load') or
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settings.MITX_FEATURES.get('ENABLE_LMS_MIGRATION'))
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return render_to_response('courseware/course_about.html',
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{'course': course,
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'registered': registered,
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'course_target': course_target,
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'show_courseware_link': show_courseware_link})
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@ensure_csrf_cookie
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@cache_if_anonymous
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def static_university_profile(request, org_id):
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"""
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Return the profile for the particular org_id that does not have any courses.
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"""
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template_file = "university_profile/{0}.html".format(org_id).lower()
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context = dict(courses=[], org_id=org_id)
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return render_to_response(template_file, context)
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@ensure_csrf_cookie
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@cache_if_anonymous
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def university_profile(request, org_id):
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"""
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Return the profile for the particular org_id. 404 if it's not valid.
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"""
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all_courses = modulestore().get_courses()
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valid_org_ids = set(c.org for c in all_courses).union(settings.VIRTUAL_UNIVERSITIES)
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if org_id not in valid_org_ids:
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raise Http404("University Profile not found for {0}".format(org_id))
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|
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# Only grab courses for this org...
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courses = get_courses_by_university(request.user,
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domain=request.META.get('HTTP_HOST'))[org_id]
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courses = sort_by_announcement(courses)
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context = dict(courses=courses, org_id=org_id)
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template_file = "university_profile/{0}.html".format(org_id).lower()
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return render_to_response(template_file, context)
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|
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def render_notifications(request, course, notifications):
|
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context = {
|
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'notifications': notifications,
|
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'get_discussion_title': partial(get_discussion_title, request=request, course=course),
|
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'course': course,
|
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}
|
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return render_to_string('courseware/notifications.html', context)
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@login_required
|
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def news(request, course_id):
|
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course = get_course_with_access(request.user, course_id, 'load')
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|
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notifications = comment_client.get_notifications(request.user.id)
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|
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context = {
|
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'course': course,
|
|
'content': render_notifications(request, course, notifications),
|
|
}
|
|
|
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return render_to_response('courseware/news.html', context)
|
|
|
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|
|
@login_required
|
|
@cache_control(no_cache=True, no_store=True, must_revalidate=True)
|
|
def progress(request, course_id, student_id=None):
|
|
""" User progress. We show the grade bar and every problem score.
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|
|
|
Course staff are allowed to see the progress of students in their class.
|
|
"""
|
|
course = get_course_with_access(request.user, course_id, 'load')
|
|
staff_access = has_access(request.user, course, 'staff')
|
|
|
|
if student_id is None or student_id == request.user.id:
|
|
# always allowed to see your own profile
|
|
student = request.user
|
|
else:
|
|
# Requesting access to a different student's profile
|
|
if not staff_access:
|
|
raise Http404
|
|
student = User.objects.get(id=int(student_id))
|
|
|
|
# NOTE: To make sure impersonation by instructor works, use
|
|
# student instead of request.user in the rest of the function.
|
|
|
|
# The pre-fetching of groups is done to make auth checks not require an
|
|
# additional DB lookup (this kills the Progress page in particular).
|
|
student = User.objects.prefetch_related("groups").get(id=student.id)
|
|
|
|
student_module_cache = StudentModuleCache.cache_for_descriptor_descendents(
|
|
course_id, student, course)
|
|
|
|
courseware_summary = grades.progress_summary(student, request, course,
|
|
student_module_cache)
|
|
grade_summary = grades.grade(student, request, course, student_module_cache)
|
|
|
|
if courseware_summary is None:
|
|
#This means the student didn't have access to the course (which the instructor requested)
|
|
raise Http404
|
|
|
|
context = {'course': course,
|
|
'courseware_summary': courseware_summary,
|
|
'grade_summary': grade_summary,
|
|
'staff_access': staff_access,
|
|
}
|
|
context.update()
|
|
|
|
return render_to_response('courseware/progress.html', context)
|