Show new users an error page when they try to sign up for a deactivated realm.

(imported from commit 1696a6a5d26ec92b881cd3fda43e6b262e2fbfa5)

templates/zerver/deactivated.html

@@ -0,0 +1,14 @@
+{% extends "zerver/portico.html" %}
+
+{% block portico_content %}
+
+<h3>Deactivated organization</h3>
+
+<p>Hi there! Thank you for your interest in Zulip.</p>
+
+<p>The organization you are trying to join, {{ deactivated_domain_name }}, has
+been deactivated. Please
+contact <a href="mailto:support@zulip.com">support@zulip.com</a> to reactivate
+this group.</p>
+
+{% endblock %}

zerver/tests.py

@@ -811,6 +811,21 @@ class LoginTest(AuthedTestCase):
         user_profile = get_user_profile_by_email('test@zulip.com')
         self.assertEqual(self.client.session['_auth_user_id'], user_profile.id)
 
+    def test_register_deactivated(self):
+        """
+        If you try to register for a deactivated realm, you get a clear error
+        page.
+        """
+        realm = Realm.objects.get(domain="zulip.com")
+        realm.deactivated = True
+        realm.save(update_fields=["deactivated"])
+
+        result = self.register("test", "test")
+        self.assertIn("has been deactivated", result.content.replace("\n", " "))
+
+        with self.assertRaises(UserProfile.DoesNotExist):
+            get_user_profile_by_email('test@zulip.com')
+
     def test_logout(self):
         self.login("hamlet@zulip.com")
         self.client.post('/accounts/logout/')

zerver/views/__init__.py

@@ -241,6 +241,13 @@ def accounts_register(request):
     else:
         domain = resolve_email_to_domain(email)
 
+    realm = get_realm(domain)
+    if realm and realm.deactivated:
+        # The user is trying to register for a deactivated realm. Advise them to
+        # contact support.
+        return render_to_response("zerver/deactivated.html",
+                                  {"deactivated_domain_name": realm.name})
+
     try:
         if mit_beta_user:
             # MIT users already exist, but are supposed to be inactive.