Add email opt in to old login and register pages

common/djangoapps/student/tests/test_login_registration_forms.py

 """Tests for the login and registration form rendering. """
 import urllib
 import unittest
+from collections import OrderedDict
 from mock import patch
 from django.conf import settings
 from django.core.urlresolvers import reverse
@@ -125,6 +126,29 @@ class LoginFormTest(ModuleStoreTestCase):
         )
         self.assertContains(response, expected_url)
 
+    @ddt.data(None, "true", "false")
+    def test_email_opt_in(self, opt_in_value):
+        params = {
+            'course_id': self.course_id,
+            'enrollment_action': 'enroll'
+        }
+
+        if opt_in_value is not None:
+            params['email_opt_in'] = opt_in_value
+
+        # Get the login page
+        response = self.client.get(self.url, params)
+
+        # Verify that the hidden parameter is set correctly
+        hidden_param = '<input type="hidden" name="email_opt_in" value="{val}"'.format(
+            val=opt_in_value
+        )
+
+        if opt_in_value is not None:
+            self.assertContains(response, hidden_param)
+        else:
+            self.assertNotContains(response, hidden_param)
+
 
 @ddt.ddt
 @override_settings(MODULESTORE=MODULESTORE_CONFIG)
@@ -182,3 +206,32 @@ class RegisterFormTest(ModuleStoreTestCase):
             redirect_url=reverse("shoppingcart.views.show_cart")
         )
         self.assertContains(response, expected_url)
+
+    @ddt.data(None, "true", "false")
+    def test_email_opt_in(self, opt_in_value):
+        params = OrderedDict()
+        params['course_id'] = self.course_id
+        params['enrollment_action'] = 'enroll'
+
+        if opt_in_value is not None:
+            params['email_opt_in'] = opt_in_value
+
+        # Get the login page
+        response = self.client.get(self.url, params)
+
+        # Verify that the hidden parameter is set correctly
+        hidden_param = '<input type="hidden" name="email_opt_in" value="{val}"'.format(
+            val=opt_in_value
+        )
+
+        if opt_in_value is not None:
+            self.assertContains(response, hidden_param)
+        else:
+            self.assertNotContains(response, hidden_param)
+
+        # Verify that the login link preserves the querystring params
+        login_link = u"{url}?{params}".format(
+            url=reverse('signin_user'),
+            params=urllib.urlencode(params)
+        )
+        self.assertContains(response, login_link)

common/djangoapps/student/views.py

@@ -364,8 +364,10 @@ def signin_user(request):
         return redirect(reverse('dashboard'))
 
     course_id = request.GET.get('course_id')
+    email_opt_in = request.GET.get('email_opt_in')
     context = {
         'course_id': course_id,
+        'email_opt_in': email_opt_in,
         'enrollment_action': request.GET.get('enrollment_action'),
         # Bool injected into JS to submit form if we're inside a running third-
         # party auth pipeline; distinct from the actual instance of the running
@@ -394,9 +396,11 @@ def register_user(request, extra_context=None):
         return external_auth.views.redirect_with_get('root', request.GET)
 
     course_id = request.GET.get('course_id')
+    email_opt_in = request.GET.get('email_opt_in')
 
     context = {
         'course_id': course_id,
+        'email_opt_in': email_opt_in,
         'email': '',
         'enrollment_action': request.GET.get('enrollment_action'),
         'name': '',

lms/templates/login.html

@@ -198,6 +198,10 @@
       <input type="hidden" name="course_id" value="${course_id | h}" />
 % endif
 
+% if email_opt_in:
+      <input type="hidden" name="email_opt_in" value="${email_opt_in | h}" />
+% endif
+
       <div class="form-actions">
         <button name="submit" type="submit" id="submit" class="action action-primary action-update login-button"></button>
       </div>

lms/templates/main.html

@@ -158,8 +158,12 @@
 </html>
 
 <%def name="login_query()">${
-  u"?course_id={0}&enrollment_action={1}".format(
+  u"?course_id={0}&enrollment_action={1}{email_opt_in}".format(
     urlquote_plus(course_id),
-    urlquote_plus(enrollment_action)
+    urlquote_plus(enrollment_action),
+    email_opt_in=(
+      u"&email_opt_in=" + urlquote_plus(email_opt_in)
+      if email_opt_in else ""
+    )
   ) if course_id and enrollment_action else ""
 }</%def>

lms/templates/register.html

@@ -361,6 +361,10 @@
       <input type="hidden" name="course_id" value="${course_id | h}" />
 % endif
 
+% if email_opt_in:
+      <input type="hidden" name="email_opt_in" value="${email_opt_in | h }" />
+% endif
+
       <div class="form-actions">
         <button name="submit" type="submit" id="submit" class="action action-primary action-update register-button">${_('Register')} <span class="orn-plus">+</span> ${_('Create My Account')}</button>
       </div>