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edx-platform/lms/djangoapps/instructor_task/tasks_helper/certs.py
2021-03-30 10:23:23 -04:00

167 lines
7.3 KiB
Python

"""
Instructor tasks related to certificates.
"""
import logging
from time import time
from django.contrib.auth import get_user_model
from django.db.models import Q
from common.djangoapps.student.models import CourseEnrollment
from lms.djangoapps.certificates.api import (
can_generate_certificate_task,
generate_certificate_task,
generate_user_certificates,
get_allowlisted_users
)
from lms.djangoapps.certificates.models import CertificateStatuses, GeneratedCertificate
from xmodule.modulestore.django import modulestore
from .runner import TaskProgress
User = get_user_model()
log = logging.getLogger(__name__)
def generate_students_certificates(
_xmodule_instance_args, _entry_id, course_id, task_input, action_name):
"""
For a given `course_id`, generate certificates for only students present in 'students' key in task_input
json column, otherwise generate certificates for all enrolled students.
"""
start_time = time()
students_to_generate_certs_for = CourseEnrollment.objects.users_enrolled_in(course_id)
student_set = task_input.get('student_set')
if student_set == 'all_whitelisted':
# Generate Certificates for all white listed students.
students_to_generate_certs_for = students_to_generate_certs_for.filter(
certificatewhitelist__course_id=course_id,
certificatewhitelist__whitelist=True
)
elif student_set == 'whitelisted_not_generated':
# Whitelist students who did not get certificates already.
students_to_generate_certs_for = students_to_generate_certs_for.filter(
certificatewhitelist__course_id=course_id,
certificatewhitelist__whitelist=True
).exclude(
generatedcertificate__course_id=course_id,
generatedcertificate__status__in=CertificateStatuses.PASSED_STATUSES
)
elif student_set == "specific_student":
specific_student_id = task_input.get('specific_student_id')
students_to_generate_certs_for = students_to_generate_certs_for.filter(id=specific_student_id)
task_progress = TaskProgress(action_name, students_to_generate_certs_for.count(), start_time)
current_step = {'step': 'Calculating students already have certificates'}
task_progress.update_task_state(extra_meta=current_step)
statuses_to_regenerate = task_input.get('statuses_to_regenerate', [])
if student_set is not None and not statuses_to_regenerate:
# We want to skip 'filtering students' only when students are given and statuses to regenerate are not
students_require_certs = students_to_generate_certs_for
else:
students_require_certs = students_require_certificate(
course_id, students_to_generate_certs_for, statuses_to_regenerate
)
log.info(f'About to attempt certificate generation for {len(students_require_certs)} users in course {course_id}. '
f'The student_set is {student_set} and statuses_to_regenerate is {statuses_to_regenerate}')
if statuses_to_regenerate:
# Mark existing generated certificates as 'unavailable' before regenerating
# We need to call this method after "students_require_certificate" otherwise "students_require_certificate"
# would return no results.
_invalidate_generated_certificates(course_id, students_to_generate_certs_for, statuses_to_regenerate)
task_progress.skipped = task_progress.total - len(students_require_certs)
current_step = {'step': 'Generating Certificates'}
task_progress.update_task_state(extra_meta=current_step)
course = modulestore().get_course(course_id, depth=0)
# Generate certificate for each student
for student in students_require_certs:
task_progress.attempted += 1
if can_generate_certificate_task(student, course_id):
log.info(f'{course_id} is using V2 certificates. Attempt will be made to generate a V2 certificate '
f'for user {student.id}.')
generate_certificate_task(student, course_id)
else:
log.info(f'Attempt will be made to generate a certificate for user {student.id} in {course_id}.')
generate_user_certificates(
student,
course_id,
course=course
)
return task_progress.update_task_state(extra_meta=current_step)
def students_require_certificate(course_id, enrolled_students, statuses_to_regenerate=None):
"""
Returns list of students where certificates needs to be generated.
if 'statuses_to_regenerate' is given then return students that have Generated Certificates
and the generated certificate status lies in 'statuses_to_regenerate'
if 'statuses_to_regenerate' is not given then return all the enrolled student skipping the ones
whose certificates have already been generated.
:param course_id:
:param enrolled_students:
:param statuses_to_regenerate:
"""
if statuses_to_regenerate:
# Return Students that have Generated Certificates and the generated certificate status
# lies in 'statuses_to_regenerate'
students_require_certificates = enrolled_students.filter(
generatedcertificate__course_id=course_id,
generatedcertificate__status__in=statuses_to_regenerate
)
# Fetch results otherwise subsequent operations on table cause wrong data fetch
return list(students_require_certificates)
else:
# compute those students whose certificates are already generated
students_already_have_certs = User.objects.filter(
~Q(generatedcertificate__status=CertificateStatuses.unavailable),
generatedcertificate__course_id=course_id)
# Return all the enrolled student skipping the ones whose certificates have already been generated
return list(set(enrolled_students) - set(students_already_have_certs))
def _invalidate_generated_certificates(course_id, enrolled_students, certificate_statuses):
"""
Invalidate generated certificates for all enrolled students in the given course having status in
'certificate_statuses', if the student is not on the course's allowlist.
Generated Certificates are invalidated by marking its status 'unavailable' and updating verify_uuid, download_uuid,
download_url and grade with empty string.
:param course_id: Course Key for the course whose generated certificates need to be removed
:param enrolled_students: (queryset or list) students enrolled in the course
:param certificate_statuses: certificates statuses for whom to remove generated certificate
"""
certificates = GeneratedCertificate.objects.filter(
user__in=enrolled_students,
course_id=course_id,
status__in=certificate_statuses,
)
allowlisted_users = get_allowlisted_users(course_id)
# Invalidate each cert that is not allowlisted. We loop over the certs and invalidate each individually in order to
# save a history of the change.
for c in certificates:
if c.user in allowlisted_users:
log.info(f'Certificate for user {c.user.id} will not be invalidated because they are on the allowlist for '
f'course {course_id}')
else:
log.info(f'About to invalidate certificate for user {c.user.id} in course {course_id}')
c.invalidate()