feat: allow enrollment into 'invite-only' courses

This adds a new flag to the EnterpriseCustomer model that can be used to
allow users to enroll into "Invitation Only" courses by visiting the
enterprise enrollment URL without being explicityly invited by course
instructors.

Internal-Ref: https://tasks.opencraft.com/browse/BB-7619

enterprise/admin/forms.py

@@ -399,6 +399,7 @@ class Meta:
             "replace_sensitive_sso_username",
             "hide_course_original_price",
             "hide_course_price_when_zero",
+            "allow_enrollment_in_invite_only_courses",
             "enable_portal_code_management_screen",
             "enable_portal_subscription_management_screen",
             "enable_learner_portal",

enterprise/migrations/0156_auto_20230724_1611.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.15 on 2023-07-24 16:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('enterprise', '0155_auto_20230706_0810'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='enterprisecustomer',
+            name='allow_enrollment_in_invite_only_courses',
+            field=models.BooleanField(default=False, help_text="Specifies if learners are allowed to enroll into courses marked as 'invitation-only', when they attempt to enroll from the landing page."),
+        ),
+        migrations.AddField(
+            model_name='historicalenterprisecustomer',
+            name='allow_enrollment_in_invite_only_courses',
+            field=models.BooleanField(default=False, help_text="Specifies if learners are allowed to enroll into courses marked as 'invitation-only', when they attempt to enroll from the landing page."),
+        ),
+    ]

enterprise/models.py

@@ -391,6 +391,14 @@ class Meta:
         help_text=_("Specify whether course cost should be hidden in the landing page when the final price is zero.")
     )
 
+    allow_enrollment_in_invite_only_courses = models.BooleanField(
+        default=False,
+        help_text=_(
+            "Specifies if learners are allowed to enroll into courses marked as 'invitation-only', "
+            "when they attempt to enroll from the landing page."
+        )
+    )
+
     @property
     def enterprise_customer_identity_provider(self):
         """

enterprise/utils.py

@@ -59,8 +59,10 @@
 
 try:
     from common.djangoapps.course_modes.models import CourseMode
+    from common.djangoapps.student.models import CourseEnrollmentAllowed
 except ImportError:
     CourseMode = None
+    CourseEnrollmentAllowed = None
 
 try:
     from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
@@ -2326,3 +2328,22 @@ def hide_price_when_zero(enterprise_customer, course_modes):
                 mode['title']
             )
     return course_modes
+
+
+def ensure_course_enrollment_is_allowed(course_id, email, enrollment_api_client):
+    """
+    Creates a CourseEnrollmentAllowed object for initiation only courses.
+    Arguments:
+        course_id (str): ID of the course to allow enrollment
+        email (str): email of the user whose enrollment should be allowed
+        enrollment_api_client (:class:`enterprise.api_client.lms.EnrollmentApiClient`): Enrollment API Client
+    """
+    if not CourseEnrollmentAllowed:
+        raise NotConnectedToOpenEdX()
+
+    course_details = enrollment_api_client.get_course_details(course_id)
+    if course_details["invite_only"]:
+        CourseEnrollmentAllowed.objects.update_or_create(
+            course_id=course_id,
+            email=email,
+        )

enterprise/views.py

@@ -62,6 +62,7 @@
     CourseEnrollmentPermissionError,
     NotConnectedToOpenEdX,
     clean_html_for_template_rendering,
+    ensure_course_enrollment_is_allowed,
     filter_audit_course_modes,
     format_price,
     get_active_course_runs,
@@ -1661,12 +1662,17 @@ def post(self, request, enterprise_uuid, course_id):
             enterprise_customer.uuid,
             course_id=course_id
         ).consent_required()
+
+        client = EnrollmentApiClient()
+        if enterprise_customer.allow_enrollment_in_invite_only_courses:
+            # Make sure the enrollment is allowed if the course is marked "invite-only"
+            ensure_course_enrollment_is_allowed(course_id, request.user.email, client)
+
         if not selected_course_mode.get('premium') and not user_consent_needed:
             # For the audit course modes (audit, honor), where DSC is not
             # required, enroll the learner directly through enrollment API
             # client and redirect the learner to LMS courseware page.
             succeeded = True
-            client = EnrollmentApiClient()
             try:
                 client.enroll_user_in_course(
                     request.user.username,
@@ -1711,51 +1717,12 @@ def post(self, request, enterprise_uuid, course_id):
             return redirect(LMS_COURSEWARE_URL.format(course_id=course_id))
 
         if user_consent_needed:
-            # For the audit course modes (audit, honor) or for the premium
-            # course modes (Verified, Prof Ed) where DSC is required, redirect
-            # the learner to course specific DSC with enterprise UUID from
-            # there the learner will be directed to the ecommerce flow after
-            # providing DSC.
-            query_string_params = {
-                'course_mode': selected_course_mode_name,
-            }
-            if enterprise_catalog_uuid:
-                query_string_params.update({'catalog': enterprise_catalog_uuid})
-
-            next_url = '{handle_consent_enrollment_url}?{query_string}'.format(
-                handle_consent_enrollment_url=reverse(
-                    'enterprise_handle_consent_enrollment', args=[enterprise_customer.uuid, course_id]
-                ),
-                query_string=urlencode(query_string_params)
-            )
-
-            failure_url = reverse('enterprise_course_run_enrollment_page', args=[enterprise_customer.uuid, course_id])
-            if request.META['QUERY_STRING']:
-                # Preserve all querystring parameters in the request to build
-                # failure url, so that learner views the same enterprise course
-                # enrollment page (after redirect) as for the first time.
-                # Since this is a POST view so use `request.META` to get
-                # querystring instead of `request.GET`.
-                # https://docs.djangoproject.com/en/1.11/ref/request-response/#django.http.HttpRequest.META
-                failure_url = '{course_enrollment_url}?{query_string}'.format(
-                    course_enrollment_url=reverse(
-                        'enterprise_course_run_enrollment_page', args=[enterprise_customer.uuid, course_id]
-                    ),
-                    query_string=request.META['QUERY_STRING']
-                )
-
-            return redirect(
-                '{grant_data_sharing_url}?{params}'.format(
-                    grant_data_sharing_url=reverse('grant_data_sharing_permissions'),
-                    params=urlencode(
-                        {
-                            'next': next_url,
-                            'failure_url': failure_url,
-                            'enterprise_customer_uuid': enterprise_customer.uuid,
-                            'course_id': course_id,
-                        }
-                    )
-                )
+            return self._handle_user_consent_flow(
+                request,
+                enterprise_customer,
+                enterprise_catalog_uuid,
+                course_id,
+                selected_course_mode_name
             )
 
         # For the premium course modes (Verified, Prof Ed) where DSC is
@@ -1770,6 +1737,56 @@ def post(self, request, enterprise_uuid, course_id):
 
         return redirect(premium_flow)
 
+    def _handle_user_consent_flow(self, request, enterprise_customer, enterprise_catalog_uuid, course_id, course_mode):
+        """
+        For the audit course modes (audit, honor) or for the premium
+        course modes (Verified, Prof Ed) where DSC is required, redirect
+        the learner to course specific DSC with enterprise UUID from
+        there the learner will be directed to the ecommerce flow after
+        providing DSC.
+        """
+        query_string_params = {
+            'course_mode': course_mode,
+        }
+        if enterprise_catalog_uuid:
+            query_string_params.update({'catalog': enterprise_catalog_uuid})
+
+        next_url = '{handle_consent_enrollment_url}?{query_string}'.format(
+            handle_consent_enrollment_url=reverse(
+                'enterprise_handle_consent_enrollment', args=[enterprise_customer.uuid, course_id]
+            ),
+            query_string=urlencode(query_string_params)
+        )
+
+        failure_url = reverse('enterprise_course_run_enrollment_page', args=[enterprise_customer.uuid, course_id])
+        if request.META['QUERY_STRING']:
+            # Preserve all querystring parameters in the request to build
+            # failure url, so that learner views the same enterprise course
+            # enrollment page (after redirect) as for the first time.
+            # Since this is a POST view so use `request.META` to get
+            # querystring instead of `request.GET`.
+            # https://docs.djangoproject.com/en/1.11/ref/request-response/#django.http.HttpRequest.META
+            failure_url = '{course_enrollment_url}?{query_string}'.format(
+                course_enrollment_url=reverse(
+                    'enterprise_course_run_enrollment_page', args=[enterprise_customer.uuid, course_id]
+                ),
+                query_string=request.META['QUERY_STRING']
+            )
+
+        return redirect(
+            '{grant_data_sharing_url}?{params}'.format(
+                grant_data_sharing_url=reverse('grant_data_sharing_permissions'),
+                params=urlencode(
+                    {
+                        'next': next_url,
+                        'failure_url': failure_url,
+                        'enterprise_customer_uuid': enterprise_customer.uuid,
+                        'course_id': course_id,
+                    }
+                )
+            )
+        )
+
     @method_decorator(enterprise_login_required)
     @method_decorator(force_fresh_session)
     def get(self, request, enterprise_uuid, course_id):