Merge pull request #3193 from edx/jbau/edx-west/sneakpeek-deeplink-middleware

middleware to allow sneakpeek courses to deeplink

lms/djangoapps/sneakpeek_deeplink/middleware.py

+"""
+Middleware class that supports deep-links for allows courses that allow sneakpeek.
+The user will be registered anonymously, logged in, and enrolled in the course
+"""
+from student.models import CourseEnrollment
+from util.request import course_id_from_url
+from courseware.models import CoursePreference
+from student.views import _create_and_login_nonregistered_user, _check_can_enroll_in_course
+
+class SneakPeekDeepLinkMiddleware(object):
+    """
+    Sneak Peak Deep Link Middlware
+    """
+    def process_request(self, request):
+        """
+        Only if the following are all true:
+          1. request.user is AnonymousUser (This middleware must be added after the AuthenticationMiddleware)
+          2. request has a course context
+          3. request's course allows sneakpeek
+          4. request's course's enrollment period is open
+        Does the following:
+          1. Registers an anonymous user
+          2. Login this user in
+          3. Enrolls this user in the course
+        """
+        ### Start by testing the conditions, each of which can fail fast and return,
+        ### causing the middleware to do nothing
+        if request.user.is_authenticated():
+            return None
+
+        course_id = course_id_from_url(request.path)
+        if not course_id:
+            return None
+
+        if not CoursePreference.course_allows_nonregistered_access(course_id):
+            return None
+
+        can_enroll, _ = _check_can_enroll_in_course(
+            request.user,
+            course_id,
+            access_type='within_enrollment_period')
+
+        if not can_enroll:
+            return None
+
+        ### OK. We should now do the 3 steps to get the users access to follow the deeplink
+        _create_and_login_nonregistered_user(request)
+        CourseEnrollment.enroll(request.user, course_id)
+        return None

lms/envs/common.py

@@ -735,6 +735,9 @@ MIDDLEWARE_CLASSES = (
     #'django.contrib.auth.middleware.AuthenticationMiddleware',
     'cache_toolbox.middleware.CacheBackedAuthenticationMiddleware',
     'student.middleware.UserStandingMiddleware',
+
+    # sneakpeek deeplinks
+    'sneakpeek_deeplink.middleware.SneakPeekDeepLinkMiddleware',
     'contentserver.middleware.StaticContentServer',
     'crum.CurrentRequestUserMiddleware',
 
@@ -779,6 +782,7 @@ MIDDLEWARE_CLASSES = (
 
     # use Django built in clickjacking protection
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+
 )
 
 # Clickjacking protection can be enabled by setting this to 'DENY'
@@ -1215,6 +1219,8 @@ INSTALLED_APPS = (
     'reverification',
 
     'embargo',
+
+    'sneakpeek_deeplink',
 )
 
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