demo-orgs: Create dev environment demo organization without email.

To make creation of demo organizations feel lightweight for users,
we do not want to require an email address at sign-up. Instead an
empty string will used for the new realm owner's email. Currently
implements that for new demo organizations in the development
environment.

Because the user's email address does not exist, we don't enqueue
any of the welcome emails upon account/realm creation, and we
don't create/send new login emails.

This is a part of #19523.

Co-authored by: Tim Abbott <tabbott@zulip.com>
Co-authored by: Lauryn Menard <lauryn@zulip.com>

zerver/actions/create_user.py

@@ -280,7 +280,7 @@ def process_new_human_user(
     # from being sent after the user is created.
     clear_scheduled_invitation_emails(user_profile.delivery_email)
     if realm.send_welcome_emails:
-        enqueue_welcome_emails(user_profile)
+        enqueue_welcome_emails(user_profile, realm_creation)
 
     # Schedule an initial email with the user's
     # new account details and log-in information.

zerver/lib/email_notifications.py

@@ -767,6 +767,13 @@ def send_account_registered_email(user: UserProfile, realm_creation: bool = Fals
     # Imported here to avoid import cycles.
     from zerver.context_processors import common_context
 
+    if user.delivery_email == "":
+        # Do not attempt to enqueue welcome emails for users without an email address.
+        # The assertions here are to help document the only circumstance under which
+        # this condition should be possible.
+        assert user.realm.demo_organization_scheduled_deletion_date is not None and realm_creation
+        return
+
     from_name, from_address = welcome_sender_information()
     realm_url = user.realm.uri
 
@@ -811,10 +818,17 @@ def send_account_registered_email(user: UserProfile, realm_creation: bool = Fals
     )
 
 
-def enqueue_welcome_emails(user: UserProfile) -> None:
+def enqueue_welcome_emails(user: UserProfile, realm_creation: bool = False) -> None:
     # Imported here to avoid import cycles.
     from zerver.context_processors import common_context
 
+    if user.delivery_email == "":
+        # Do not attempt to enqueue welcome emails for users without an email address.
+        # The assertions here are to help document the only circumstance under which
+        # this condition should be possible.
+        assert user.realm.demo_organization_scheduled_deletion_date is not None and realm_creation
+        return
+
     from_name, from_address = welcome_sender_information()
     other_account_count = (
         UserProfile.objects.filter(delivery_email__iexact=user.delivery_email)

zerver/signals.py

@@ -67,6 +67,16 @@ def get_device_os(user_agent: str) -> Optional[str]:
 def email_on_new_login(sender: Any, user: UserProfile, request: Any, **kwargs: Any) -> None:
     if not user.enable_login_emails:
         return
+
+    if user.delivery_email == "":
+        # Do not attempt to send new login emails for users without an email address.
+        # The assertions here are to help document the only circumstance under which
+        # this condition should be possible.
+        assert (
+            user.realm.demo_organization_scheduled_deletion_date is not None and user.is_realm_owner
+        )
+        return
+
     # We import here to minimize the dependencies of this module,
     # since it runs as part of `manage.py` initialization
     from zerver.context_processors import common_context

zerver/tests/test_signup.py

@@ -3952,6 +3952,11 @@ class UserSignUpTest(ZulipTestCase):
         assert user_profile is not None
         self.assert_logged_in_user_id(user_profile.id)
 
+        # Demo organizations are created without setting an email address for the owner.
+        self.assertEqual(user_profile.delivery_email, "")
+        scheduled_email = ScheduledEmail.objects.filter(users=user_profile).last()
+        assert scheduled_email is None
+
         expected_deletion_date = realm.date_created + datetime.timedelta(
             days=settings.DEMO_ORG_DEADLINE_DAYS
         )

zerver/views/development/registration.py

@@ -88,9 +88,9 @@ def register_development_realm(request: HttpRequest) -> HttpResponse:
 
 @csrf_exempt
 def register_demo_development_realm(request: HttpRequest) -> HttpResponse:
-    count = UserProfile.objects.count()
-    name = f"user-{count}"
-    email = f"{name}@zulip.com"
+    # Demo organization owners are not required to provide a name or email.
+    name = "Your name"
+    email = ""
     realm_name = generate_demo_realm_name()
     realm_type = Realm.ORG_TYPES["business"]["id"]
     realm_subdomain = realm_name

zerver/views/registration.py

@@ -213,6 +213,7 @@ def registration_helper(
     source_realm_id: Optional[int] = REQ(
         default=None, converter=to_converted_or_fallback(to_non_negative_int, None)
     ),
+    form_is_demo_organization: Optional[str] = REQ("is_demo_organization", default=None),
 ) -> HttpResponse:
     try:
         prereg_object, realm_creation = check_prereg_key(request, key)
@@ -233,12 +234,29 @@ def registration_helper(
         password_required = prereg_object.password_required
         role = prereg_object.invited_as
 
-    try:
-        validators.validate_email(email)
-    except ValidationError:
-        return TemplateResponse(
-            request, "zerver/invalid_email.html", context={"invalid_email": True}
-        )
+    if form_is_demo_organization is None:
+        demo_organization_creation = False
+    else:
+        # Check the explicit strings that return false
+        # in django.forms.BooleanField.to_python.
+        false_strings = ("false", "0")
+        demo_organization_creation = form_is_demo_organization.strip().lower() not in false_strings
+
+    if email == "":
+        # Do not attempt to validate email for users without an email address.
+        # The assertions here are to help document the only circumstance under which
+        # this condition should be possible.
+        assert realm_creation and demo_organization_creation
+        # TODO: Remove settings.DEVELOPMENT when demo organization feature ready
+        # to be fully implemented.
+        assert settings.DEVELOPMENT
+    else:
+        try:
+            validators.validate_email(email)
+        except ValidationError:
+            return TemplateResponse(
+                request, "zerver/invalid_email.html", context={"invalid_email": True}
+            )
 
     if realm_creation:
         # For creating a new realm, there is no existing realm or domain
@@ -419,12 +437,12 @@ def registration_helper(
             string_id = form.cleaned_data["realm_subdomain"]
             realm_name = form.cleaned_data["realm_name"]
             realm_type = form.cleaned_data["realm_type"]
-            is_demo_org = form.cleaned_data["is_demo_organization"]
+            is_demo_organization = form.cleaned_data["is_demo_organization"]
             realm = do_create_realm(
                 string_id,
                 realm_name,
                 org_type=realm_type,
-                is_demo_organization=is_demo_org,
+                is_demo_organization=is_demo_organization,
                 prereg_realm=prereg_realm,
             )
         assert realm is not None