core: add API to check access to single application by slug

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/core/api/applications.py

@@ -91,6 +91,23 @@ class ApplicationViewSet(ModelViewSet):
                 applications.append(application)
         return applications
 
+    @swagger_auto_schema(
+        responses={
+            204: "Access granted",
+            403: "Access denied",
+        }
+    )
+    @action(detail=True, methods=["GET"])
+    # pylint: disable=unused-argument
+    def check_access(self, request: Request, slug: str) -> Response:
+        """Check access to a single application by slug"""
+        application = self.get_object()
+        engine = PolicyEngine(application, self.request.user, self.request)
+        engine.build()
+        if engine.passing:
+            return Response(status=204)
+        return Response(status=403)
+
     @swagger_auto_schema(
         manual_parameters=[
             openapi.Parameter(

authentik/core/tests/test_applications_api.py

@@ -0,0 +1,125 @@
+"""Test Applications API"""
+from django.urls import reverse
+from django.utils.encoding import force_str
+from rest_framework.test import APITestCase
+
+from authentik.core.models import Application, User
+from authentik.policies.dummy.models import DummyPolicy
+from authentik.policies.models import PolicyBinding
+
+
+class TestApplicationsAPI(APITestCase):
+    """Test applications API"""
+
+    def setUp(self) -> None:
+        self.user = User.objects.get(username="akadmin")
+        self.allowed = Application.objects.create(name="allowed", slug="allowed")
+        self.denied = Application.objects.create(name="denied", slug="denied")
+        PolicyBinding.objects.create(
+            target=self.denied,
+            policy=DummyPolicy.objects.create(
+                name="deny", result=False, wait_min=1, wait_max=2
+            ),
+            order=0,
+        )
+
+    def test_check_access(self):
+        """Test check_access operation """
+        self.client.force_login(self.user)
+        response = self.client.get(
+            reverse(
+                "authentik_api:application-check-access",
+                kwargs={"slug": self.allowed.slug},
+            )
+        )
+        self.assertEqual(response.status_code, 204)
+        response = self.client.get(
+            reverse(
+                "authentik_api:application-check-access",
+                kwargs={"slug": self.denied.slug},
+            )
+        )
+        self.assertEqual(response.status_code, 403)
+
+    def test_list(self):
+        """Test list operation without superuser_full_list"""
+        self.client.force_login(self.user)
+        response = self.client.get(reverse("authentik_api:application-list"))
+        self.assertJSONEqual(
+            force_str(response.content),
+            {
+                "pagination": {
+                    "next": 0,
+                    "previous": 0,
+                    "count": 2,
+                    "current": 1,
+                    "total_pages": 1,
+                    "start_index": 1,
+                    "end_index": 2,
+                },
+                "results": [
+                    {
+                        "pk": str(self.allowed.pk),
+                        "name": "allowed",
+                        "slug": "allowed",
+                        "provider": None,
+                        "provider_obj": None,
+                        "launch_url": None,
+                        "meta_launch_url": "",
+                        "meta_icon": None,
+                        "meta_description": "",
+                        "meta_publisher": "",
+                        "policy_engine_mode": "any",
+                    },
+                ],
+            },
+        )
+
+    def test_list_superuser_full_list(self):
+        """Test list operation with superuser_full_list"""
+        self.client.force_login(self.user)
+        response = self.client.get(
+            reverse("authentik_api:application-list") + "?superuser_full_list=true"
+        )
+        self.assertJSONEqual(
+            force_str(response.content),
+            {
+                "pagination": {
+                    "next": 0,
+                    "previous": 0,
+                    "count": 2,
+                    "current": 1,
+                    "total_pages": 1,
+                    "start_index": 1,
+                    "end_index": 2,
+                },
+                "results": [
+                    {
+                        "pk": str(self.allowed.pk),
+                        "name": "allowed",
+                        "slug": "allowed",
+                        "provider": None,
+                        "provider_obj": None,
+                        "launch_url": None,
+                        "meta_launch_url": "",
+                        "meta_icon": None,
+                        "meta_description": "",
+                        "meta_publisher": "",
+                        "policy_engine_mode": "any",
+                    },
+                    {
+                        "launch_url": None,
+                        "meta_description": "",
+                        "meta_icon": None,
+                        "meta_launch_url": "",
+                        "meta_publisher": "",
+                        "name": "denied",
+                        "pk": str(self.denied.pk),
+                        "policy_engine_mode": "any",
+                        "provider": None,
+                        "provider_obj": None,
+                        "slug": "denied",
+                    },
+                ],
+            },
+        )

swagger.yaml

@@ -1329,6 +1329,33 @@ paths:
         type: string
         format: slug
         pattern: ^[-a-zA-Z0-9_]+$
+  /core/applications/{slug}/check_access/:
+    get:
+      operationId: core_applications_check_access
+      description: Check access to a single application by slug
+      parameters: []
+      responses:
+        '204':
+          description: Access granted
+        '403':
+          description: Authentication credentials were invalid, absent or insufficient.
+          schema:
+            $ref: '#/definitions/GenericError'
+        '404':
+          description: Object does not exist or caller has insufficient permissions
+            to access it.
+          schema:
+            $ref: '#/definitions/APIException'
+      tags:
+        - core
+    parameters:
+      - name: slug
+        in: path
+        description: Internal application name, used in URLs.
+        required: true
+        type: string
+        format: slug
+        pattern: ^[-a-zA-Z0-9_]+$
   /core/applications/{slug}/metrics/:
     get:
       operationId: core_applications_metrics