296 lines
9.5 KiB
Python
296 lines
9.5 KiB
Python
from collections import defaultdict
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from fs.errors import ResourceNotFoundError
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from functools import wraps
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import logging
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import inspect
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from lxml.html import rewrite_links
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from path import path
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from django.conf import settings
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from django.core.urlresolvers import reverse
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from django.http import Http404
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from module_render import get_module
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from xmodule.course_module import CourseDescriptor
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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.contentstore.content import StaticContent
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from xmodule.modulestore.xml import XMLModuleStore
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from xmodule.modulestore.exceptions import ItemNotFoundError
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from xmodule.x_module import XModule
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from static_replace import replace_urls, try_staticfiles_lookup
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from courseware.access import has_access
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import branding
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from courseware.models import StudentModuleCache
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from xmodule.modulestore.exceptions import ItemNotFoundError
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log = logging.getLogger(__name__)
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def get_request_for_thread():
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"""Walk up the stack, return the nearest first argument named "request"."""
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frame = None
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try:
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for f in inspect.stack()[1:]:
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frame = f[0]
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code = frame.f_code
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if code.co_varnames[:1] == ("request",):
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return frame.f_locals["request"]
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elif code.co_varnames[:2] == ("self", "request",):
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return frame.f_locals["request"]
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finally:
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del frame
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def get_course_by_id(course_id, depth=0):
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"""
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Given a course id, return the corresponding course descriptor.
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If course_id is not valid, raises a 404.
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depth: The number of levels of children for the modulestore to cache. None means infinite depth
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"""
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try:
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course_loc = CourseDescriptor.id_to_location(course_id)
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return modulestore().get_instance(course_id, course_loc, depth=depth)
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except (KeyError, ItemNotFoundError):
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raise Http404("Course not found.")
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def get_course_with_access(user, course_id, action, depth=0):
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"""
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Given a course_id, look up the corresponding course descriptor,
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check that the user has the access to perform the specified action
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on the course, and return the descriptor.
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Raises a 404 if the course_id is invalid, or the user doesn't have access.
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depth: The number of levels of children for the modulestore to cache. None means infinite depth
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"""
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course = get_course_by_id(course_id, depth=depth)
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if not has_access(user, course, action):
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# Deliberately return a non-specific error message to avoid
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# leaking info about access control settings
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raise Http404("Course not found.")
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return course
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def get_opt_course_with_access(user, course_id, action):
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"""
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Same as get_course_with_access, except that if course_id is None,
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return None without performing any access checks.
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"""
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if course_id is None:
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return None
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return get_course_with_access(user, course_id, action)
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def get_cohort_id(user, course_id):
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"""
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given a course id and a user, return the id of the cohort that user is assigned to
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and if the course is not cohorted or the user is an instructor, return None
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"""
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return 127
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def is_commentable_cohorted(course_id,commentable_id):
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"""
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given a course and a commentable id, return whether or not this commentable is cohorted
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"""
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def get_cohort_ids(course_id):
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"""
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given a course id, return an array of all cohort ids for that course (needed for UI
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"""
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def course_image_url(course):
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"""Try to look up the image url for the course. If it's not found,
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log an error and return the dead link"""
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if isinstance(modulestore(), XMLModuleStore):
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path = course.metadata['data_dir'] + "/images/course_image.jpg"
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return try_staticfiles_lookup(path)
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else:
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loc = course.location._replace(tag='c4x', category='asset', name='images_course_image.jpg')
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path = StaticContent.get_url_path_from_location(loc)
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return path
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def find_file(fs, dirs, filename):
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"""
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Looks for a filename in a list of dirs on a filesystem, in the specified order.
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fs: an OSFS filesystem
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dirs: a list of path objects
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filename: a string
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Returns d / filename if found in dir d, else raises ResourceNotFoundError.
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"""
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for d in dirs:
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filepath = path(d) / filename
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if fs.exists(filepath):
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return filepath
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raise ResourceNotFoundError("Could not find {0}".format(filename))
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def get_course_about_section(course, section_key):
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"""
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This returns the snippet of html to be rendered on the course about page,
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given the key for the section.
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Valid keys:
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- overview
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- title
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- university
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- number
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- short_description
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- description
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- key_dates (includes start, end, exams, etc)
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- video
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- course_staff_short
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- course_staff_extended
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- requirements
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- syllabus
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- textbook
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- faq
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- more_info
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- ocw_links
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"""
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# Many of these are stored as html files instead of some semantic
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# markup. This can change without effecting this interface when we find a
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# good format for defining so many snippets of text/html.
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# TODO: Remove number, instructors from this list
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if section_key in ['short_description', 'description', 'key_dates', 'video',
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'course_staff_short', 'course_staff_extended',
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'requirements', 'syllabus', 'textbook', 'faq', 'more_info',
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'number', 'instructors', 'overview',
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'effort', 'end_date', 'prerequisites', 'ocw_links']:
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try:
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request = get_request_for_thread()
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loc = course.location._replace(category='about', name=section_key)
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course_module = get_module(request.user, request, loc, None, course.id, not_found_ok = True, wrap_xmodule_display = False)
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html = ''
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if course_module is not None:
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html = course_module.get_html()
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return html
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except ItemNotFoundError:
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log.warning("Missing about section {key} in course {url}".format(
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key=section_key, url=course.location.url()))
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return None
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elif section_key == "title":
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return course.metadata.get('display_name', course.url_name)
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elif section_key == "university":
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return course.location.org
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elif section_key == "number":
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return course.number
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raise KeyError("Invalid about key " + str(section_key))
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def get_course_info_section(request, cache, course, section_key):
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"""
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This returns the snippet of html to be rendered on the course info page,
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given the key for the section.
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Valid keys:
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- handouts
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- guest_handouts
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- updates
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- guest_updates
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"""
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loc = Location(course.location.tag, course.location.org, course.location.course, 'course_info', section_key)
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course_module = get_module(request.user, request, loc, cache, course.id, wrap_xmodule_display = False)
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html = ''
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if course_module is not None:
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html = course_module.get_html()
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return html
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# TODO: Fix this such that these are pulled in as extra course-specific tabs.
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# arjun will address this by the end of October if no one does so prior to
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# then.
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def get_course_syllabus_section(course, section_key):
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"""
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This returns the snippet of html to be rendered on the syllabus page,
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given the key for the section.
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Valid keys:
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- syllabus
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- guest_syllabus
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"""
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# Many of these are stored as html files instead of some semantic
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# markup. This can change without effecting this interface when we find a
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# good format for defining so many snippets of text/html.
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if section_key in ['syllabus', 'guest_syllabus']:
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try:
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fs = course.system.resources_fs
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# first look for a run-specific version
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dirs = [path("syllabus") / course.url_name, path("syllabus")]
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filepath = find_file(fs, dirs, section_key + ".html")
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with fs.open(filepath) as htmlFile:
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return replace_urls(htmlFile.read().decode('utf-8'),
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course.metadata['data_dir'], course_namespace=course.location)
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except ResourceNotFoundError:
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log.exception("Missing syllabus section {key} in course {url}".format(
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key=section_key, url=course.location.url()))
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return "! Syllabus missing !"
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raise KeyError("Invalid about key " + str(section_key))
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def get_courses_by_university(user, domain=None):
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'''
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Returns dict of lists of courses available, keyed by course.org (ie university).
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Courses are sorted by course.number.
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'''
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# TODO: Clean up how 'error' is done.
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# filter out any courses that errored.
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visible_courses = get_courses(user, domain)
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universities = defaultdict(list)
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for course in visible_courses:
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universities[course.org].append(course)
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return universities
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def get_courses(user, domain=None):
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'''
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Returns a list of courses available, sorted by course.number
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'''
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courses = branding.get_visible_courses(domain)
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courses = [c for c in courses if has_access(user, c, 'see_exists')]
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courses = sorted(courses, key=lambda course:course.number)
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return courses
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def sort_by_announcement(courses):
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"""
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Sorts a list of courses by their announcement date. If the date is
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not available, sort them by their start date.
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"""
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# Sort courses by how far are they from they start day
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key = lambda course: course.sorting_score
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courses = sorted(courses, key=key)
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return courses
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