6a2b9f4521
Celery requires all tasks to be in a tasks module. Also, the task has been updated to use default values if the the course structure generator encounters a block without the graded or format fields.
234 lines
7.4 KiB
Python
234 lines
7.4 KiB
Python
""" API implementation for course-oriented interactions. """
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import logging
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from django.conf import settings
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from django.http import Http404
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from rest_framework.authentication import OAuth2Authentication, SessionAuthentication
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from rest_framework.exceptions import PermissionDenied, AuthenticationFailed
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from rest_framework.generics import RetrieveAPIView, ListAPIView
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from rest_framework.response import Response
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from xmodule.modulestore.django import modulestore
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from opaque_keys.edx.keys import CourseKey
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from course_structure_api.v0 import serializers
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from courseware import courses
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from courseware.access import has_access
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from openedx.core.djangoapps.content.course_structures import models, tasks
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from openedx.core.lib.api.permissions import IsAuthenticatedOrDebug
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from openedx.core.lib.api.serializers import PaginationSerializer
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from student.roles import CourseInstructorRole, CourseStaffRole
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log = logging.getLogger(__name__)
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class CourseViewMixin(object):
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"""
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Mixin for views dealing with course content. Also handles authorization and authentication.
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"""
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lookup_field = 'course_id'
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authentication_classes = (OAuth2Authentication, SessionAuthentication,)
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permission_classes = (IsAuthenticatedOrDebug,)
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def get_course_or_404(self):
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"""
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Retrieves the specified course, or raises an Http404 error if it does not exist.
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Also checks to ensure the user has permissions to view the course
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"""
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try:
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course_id = self.kwargs.get('course_id')
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course_key = CourseKey.from_string(course_id)
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course = courses.get_course(course_key)
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self.check_course_permissions(self.request.user, course)
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return course
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except ValueError:
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raise Http404
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def user_can_access_course(self, user, course):
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"""
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Determines if the user is staff or an instructor for the course.
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Always returns True if DEBUG mode is enabled.
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"""
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return (settings.DEBUG
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or has_access(user, CourseStaffRole.ROLE, course)
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or has_access(user, CourseInstructorRole.ROLE, course))
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def check_course_permissions(self, user, course):
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"""
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Checks if the request user can access the course.
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Raises PermissionDenied if the user does not have course access.
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"""
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if not self.user_can_access_course(user, course):
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raise PermissionDenied
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def perform_authentication(self, request):
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"""
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Ensures that the user is authenticated (e.g. not an AnonymousUser), unless DEBUG mode is enabled.
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"""
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super(CourseViewMixin, self).perform_authentication(request)
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if request.user.is_anonymous() and not settings.DEBUG:
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raise AuthenticationFailed
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class CourseList(CourseViewMixin, ListAPIView):
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"""
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**Use Case**
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CourseList returns paginated list of courses in the edX Platform. The list can be filtered by course_id.
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**Example Request**
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GET /api/course_structure/v0/courses/
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GET /api/course_structure/v0/courses/?course_id={course_id1},{course_id2}
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**Response Values**
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* id: The unique identifier for the course.
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* name: The name of the course.
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* category: The type of content. In this case, the value is always "course".
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* org: The organization specified for the course.
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* course: The course number.
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* org: The run for the course.
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* uri: The URI to use to get details of the course.
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* image_url: The URI for the course's main image.
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* start: Course start date
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* end: Course end date
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"""
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paginate_by = 10
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paginate_by_param = 'page_size'
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pagination_serializer_class = PaginationSerializer
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serializer_class = serializers.CourseSerializer
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def get_queryset(self):
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course_ids = self.request.QUERY_PARAMS.get('course_id', None)
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results = []
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if course_ids:
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course_ids = course_ids.split(',')
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for course_id in course_ids:
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course_key = CourseKey.from_string(course_id)
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course_descriptor = courses.get_course(course_key)
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results.append(course_descriptor)
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else:
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results = modulestore().get_courses()
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# Ensure only course descriptors are returned.
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results = (course for course in results if course.scope_ids.block_type == 'course')
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# Ensure only courses accessible by the user are returned.
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results = (course for course in results if self.user_can_access_course(self.request.user, course))
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# Sort the results in a predictable manner.
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return sorted(results, key=lambda course: unicode(course.id))
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class CourseDetail(CourseViewMixin, RetrieveAPIView):
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"""
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**Use Case**
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CourseDetail returns details for a course.
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**Example requests**:
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GET /api/course_structure/v0/courses/{course_id}/
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**Response Values**
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* category: The type of content.
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* name: The name of the course.
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* uri: The URI to use to get details of the course.
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* course: The course number.
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* due: The due date. For courses, the value is always null.
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* org: The organization specified for the course.
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* id: The unique identifier for the course.
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"""
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serializer_class = serializers.CourseSerializer
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def get_object(self, queryset=None):
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return self.get_course_or_404()
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class CourseStructure(CourseViewMixin, RetrieveAPIView):
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"""
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**Use Case**
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Retrieves course structure.
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**Example requests**:
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GET /api/course_structure/v0/course_structures/{course_id}/
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**Response Values**
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* root: ID of the root node of the structure
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* blocks: Dictionary mapping IDs to block nodes.
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"""
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serializer_class = serializers.CourseStructureSerializer
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course = None
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def retrieve(self, request, *args, **kwargs):
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try:
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return super(CourseStructure, self).retrieve(request, *args, **kwargs)
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except models.CourseStructure.DoesNotExist:
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# If we don't have data stored, generate it and return a 503.
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tasks.update_course_structure.delay(unicode(self.course.id))
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return Response(status=503, headers={'Retry-After': '120'})
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def get_object(self, queryset=None):
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# Make sure the course exists and the user has permissions to view it.
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self.course = self.get_course_or_404()
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course_structure = models.CourseStructure.objects.get(course_id=self.course.id)
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return course_structure.structure
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class CourseGradingPolicy(CourseViewMixin, ListAPIView):
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"""
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**Use Case**
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Retrieves course grading policy.
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**Example requests**:
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GET /api/course_structure/v0/grading_policies/{course_id}/
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**Response Values**
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* assignment_type: The type of the assignment (e.g. Exam, Homework). Note: These values are course-dependent.
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Do not make any assumptions based on assignment type.
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* count: Number of assignments of the type.
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* dropped: Number of assignments of the type that are dropped.
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* weight: Effect of the assignment type on grading.
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"""
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serializer_class = serializers.GradingPolicySerializer
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allow_empty = False
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def get_queryset(self):
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course = self.get_course_or_404()
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# Return the raw data. The serializer will handle the field mappings.
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return course.raw_grader
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