Convert a has_access check into a bridgekeeper rule

This reverts commit 5e8f90caa1.

lms/djangoapps/courseware/permissions.py

@@ -0,0 +1,9 @@
+"""
+Permission definitions for the courseware djangoapp
+"""
+
+from bridgekeeper import perms
+from .rules import HasAccessRule
+
+VIEW_COURSE_HOME = 'courseware.view_course_home'
+perms[VIEW_COURSE_HOME] = HasAccessRule('load')

lms/djangoapps/courseware/rules.py

@@ -1,12 +1,16 @@
 """
-django-rules for courseware related features
+django-rules and Bridgekeeper rules for courseware related features
 """
 from __future__ import absolute_import
 
+from bridgekeeper.rules import Rule
 from course_modes.models import CourseMode
+from django.db.models import Q
 from opaque_keys.edx.keys import CourseKey
 from student.models import CourseEnrollment
 
+from .access import has_access
+
 import rules
 
 
@@ -24,3 +28,21 @@ def is_track_ok_for_exam(user, exam):
 # proctored experience
 can_take_proctored_exam = is_track_ok_for_exam
 rules.set_perm('edx_proctoring.can_take_proctored_exam', is_track_ok_for_exam)
+
+
+class HasAccessRule(Rule):
+    """
+    A rule that calls `has_access` to determine whether it passes
+    """
+    def __init__(self, action):
+        self.action = action
+
+    def check(self, user, instance=None):
+        return has_access(user, self.action, instance)
+
+    def query(self, user):
+        # Return an always-empty queryset filter so that this always
+        # fails permissions, but still passes the is_possible_for check
+        # that is used to determine if the rule should allow a user
+        # into django admin
+        return Q(pk__in=[])

lms/djangoapps/courseware/views/views.py

@@ -57,6 +57,7 @@ from courseware.courses import (
 from courseware.masquerade import setup_masquerade
 from courseware.model_data import FieldDataCache
 from courseware.models import BaseStudentModuleHistory, StudentModule
+from courseware.permissions import VIEW_COURSE_HOME
 from courseware.url_helpers import get_redirect_url
 from courseware.user_state_client import DjangoXBlockUserStateClient
 from edxmako.shortcuts import marketing_link, render_to_response, render_to_string
@@ -810,7 +811,7 @@ def course_about(request, course_id):
         staff_access = bool(has_access(request.user, 'staff', course))
         studio_url = get_studio_url(course, 'settings/details')
 
-        if has_access(request.user, 'load', course):
+        if request.user.has_perm(VIEW_COURSE_HOME, course):
             course_target = reverse(course_home_url_name(course.id), args=[text_type(course.id)])
         else:
             course_target = reverse('about_course', args=[text_type(course.id)])