wcaOnPrem: raise a 404 with feature_not_available for playbook ExpGen

Raise an err 404 with `feature_not_available` code when the client tries
to access the ExpGen endpoint of a OnPrem server.

ansible_wisdom/ai/api/exceptions.py

@@ -143,6 +143,12 @@ class ServiceUnavailable(BaseWisdomAPIException):
     default_detail = 'An error occurred attempting to complete the request.'
 
 
+class FeatureNotAvailable(BaseWisdomAPIException):
+    status_code = 404
+    default_code = 'feature_not_available'
+    default_detail = 'The feature is not available.'
+
+
 class InternalServerError(BaseWisdomAPIException):
     status_code = 500
     default_code = 'internal_server'

ansible_wisdom/ai/api/model_client/wca_client.py

@@ -28,6 +28,7 @@
 from requests.auth import HTTPBasicAuth
 from requests.exceptions import HTTPError
 
+from ansible_ai_connect.ai.api.exceptions import FeatureNotAvailable
 from ansible_ai_connect.ai.api.formatter import (
     get_task_names_from_prompt,
     strip_task_preamble_from_multi_task_prompt,
@@ -581,3 +582,11 @@ def self_test(self) -> HealthCheckSummary:
             )
 
         return summary
+
+    def generate_playbook(
+        self, request, text: str = "", create_outline: bool = False, outline: str = ""
+    ) -> tuple[str, str]:
+        raise FeatureNotAvailable
+
+    def explain_playbook(self, request, content: str) -> str:
+        raise FeatureNotAvailable

ansible_wisdom/ai/api/tests/test_views.py

@@ -90,12 +90,14 @@
     DataSource,
 )
 from ansible_ai_connect.ai.api.utils import segment_analytics_telemetry
+from ansible_ai_connect.main.tests.test_views import create_user_with_provider
 from ansible_ai_connect.organizations.models import Organization
 from ansible_ai_connect.test_utils import (
     WisdomAppsBackendMocking,
     WisdomLogAwareMixin,
     WisdomServiceLogAwareTestCase,
 )
+from ansible_ai_connect.users.constants import USER_SOCIAL_AUTH_PROVIDER_AAP
 
 DEFAULT_SUGGESTION_ID = uuid.uuid4()
 
@@ -2744,3 +2746,32 @@ def test_service_unavailable(self, invoke):
         with self.assertRaises(Exception):
             r = self.client.post(reverse('generations'), payload, format='json')
             self.assertEqual(r.status_code, HTTPStatus.SERVICE_UNAVAILABLE)
+
+
+@modify_settings()
+@override_settings(WCA_SECRET_BACKEND_TYPE='dummy')
+@override_settings(ANSIBLE_AI_MODEL_MESH_API_TYPE="wca-onprem")
+@override_settings(ANSIBLE_WCA_USERNAME='bo')
+@override_settings(ANSIBLE_AI_MODEL_MESH_API_KEY='my-secret-key')
+class TestFeatureEnableForWcaOnprem(WisdomAppsBackendMocking):
+
+    def setUp(self):
+        super().setUp()
+        self.username = 'u' + "".join(random.choices(string.digits, k=5))
+        self.user = create_user_with_provider(USER_SOCIAL_AUTH_PROVIDER_AAP, rh_org_id=1981, social_auth_extra_data={"aap_licensed": True})
+        self.user.save()
+
+    def tearDown(self):
+        Organization.objects.filter(id=1981).delete()
+        self.user.delete()
+        super().tearDown()
+
+    @override_settings(ANSIBLE_AI_ENABLE_TECH_PREVIEW=False)
+    def test_feature_not_enabled_yet(self):
+        payload = {
+            "content": "Install Wordpress on a RHEL9",
+            "explanationId": str(uuid.uuid4()),
+        }
+        self.client.force_login(user=self.user)
+        r = self.client.post(reverse('explanations'), payload)
+        self.assertEqual(r.status_code, 404)

ansible_wisdom/main/tests/test_views.py

@@ -33,12 +33,13 @@
 from ansible_ai_connect.users.tests.test_users import create_user
 
 
-def create_user_with_provider(user_provider):
+def create_user_with_provider(user_provider, **kwargs):
     return create_user(
         username='test_user_name',
         password='test_passwords',
         provider=user_provider,
         external_username='anexternalusername',
+        **kwargs,
     )