Add "Download CSV of all student anonymized IDs" button to instructor dashboard

This is a recurrent ops problem, so we wanted to make it available
on the instructor dashboard.

lms/djangoapps/instructor/views/legacy.py

@@ -50,7 +50,7 @@ from instructor_task.api import (get_running_instructor_tasks,
 from instructor_task.views import get_task_completion_info
 from mitxmako.shortcuts import render_to_response
 from psychometrics import psychoanalyze
-from student.models import CourseEnrollment, CourseEnrollmentAllowed
+from student.models import CourseEnrollment, CourseEnrollmentAllowed, unique_id_for_user
 from student.views import course_from_id
 import track.views
 from mitxmako.shortcuts import render_to_string
@@ -584,6 +584,15 @@ def instructor_dashboard(request, course_id):
             datatable['title'] = 'Student state for problem %s' % problem_to_dump
             return return_csv('student_state_from_%s.csv' % problem_to_dump, datatable)
 
+    elif 'Download CSV of all student anonymized IDs' in action:
+        students = User.objects.filter(
+            courseenrollment__course_id=course_id,
+        ).order_by('id')
+
+        datatable = {'header': ['User ID', 'Anonymized user ID']}
+        datatable['data'] = [[s.id, unique_id_for_user(s)] for s in students]
+        return return_csv(course_id.replace('/', '-')+'-anon-ids.csv', datatable)
+
     #----------------------------------------
     # Group management
 

lms/templates/courseware/instructor_dashboard.html

@@ -416,6 +416,9 @@ function goto( mode)
         <input type="text" name="problem_to_dump" size="40">
         <input type="submit" name="action" value="Download CSV of all responses to problem">
     </p>
+    <p>
+    <input type="submit" name="action" value="Download CSV of all student anonymized IDs">
+    </p>
     <hr width="40%" style="align:left">
 %endif