[Fix #3182] Better user deletion (#3214)

* [Fix #3182] Better user deletion

* fixup according to comments

* Delete user after user ask to get deleted

* fixing lint

readthedocs/core/signals.py

@@ -5,13 +5,15 @@
 import logging
 
 from corsheaders import signals
+from django.conf import settings
+from django.db.models.signals import pre_delete
 from django.dispatch import Signal
-from django.db.models import Q
+from django.db.models import Q, Count
+from django.dispatch import receiver
 from future.backports.urllib.parse import urlparse
 
 from readthedocs.projects.models import Project, Domain
 
-
 log = logging.getLogger(__name__)
 
 WHITELIST_URLS = ['/api/v2/footer_html', '/api/v2/search', '/api/v2/docsearch']
@@ -62,4 +64,20 @@ def decide_if_cors(sender, request, **kwargs):  # pylint: disable=unused-argumen
 
     return False
 
+
+@receiver(pre_delete, sender=settings.AUTH_USER_MODEL)
+def delete_projects_and_organizations(sender, instance, *args, **kwargs):
+    # Here we count the owner list from the projects that the user own
+    # Then exclude the projects where there are more than one owner
+    projects = instance.projects.all().annotate(num_users=Count('users')).exclude(num_users__gt=1)
+
+    # Here we count the users list from the organization that the user belong
+    # Then exclude the organizations where there are more than one user
+    oauth_organizations = (instance.oauth_organizations.annotate(num_users=Count('users'))
+                                                       .exclude(num_users__gt=1))
+
+    projects.delete()
+    oauth_organizations.delete()
+
+
 signals.check_request_enabled.connect(decide_if_cors)

readthedocs/profiles/views.py

@@ -196,11 +196,9 @@ def delete_account(request):
     if request.method == 'POST':
         form = UserDeleteForm(instance=request.user, data=request.POST)
         if form.is_valid():
-
-            # Do not delete the account permanently because it may create disaster
-            # Inactive the user instead.
-            request.user.is_active = False
-            request.user.save()
+            # Delete the user permanently
+            # It will also delete some projects where he is the only owner
+            request.user.delete()
             logout(request)
             messages.info(request, 'You have successfully deleted your account')
 

readthedocs/templates/profiles/private/delete_account.html

@@ -12,6 +12,9 @@
   <form method="POST" action=".">
     {% csrf_token %}
     {{ form }}
+    <div>
+      <strong>{% trans "Be careful! This can not be undone!" %}</strong>
+    </div>
     <input type="submit" name="submit" value="{% trans "Delete Account" %}" id="submit"/>
   </form>
 {% endblock %}