flows: set default background in code not model

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

authentik/flows/migrations/0019_alter_flow_background.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.3 on 2021-06-05 17:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("authentik_flows", "0018_oob_flows"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="flow",
+            name="background",
+            field=models.FileField(
+                default=None,
+                help_text="Background shown during execution",
+                null=True,
+                upload_to="flow-backgrounds/",
+            ),
+        ),
+    ]

authentik/flows/models.py

@@ -110,17 +110,17 @@ class Flow(SerializerModel, PolicyBindingModel):
 
     background = models.FileField(
         upload_to="flow-backgrounds/",
-        default="../static/dist/assets/images/flow_background.jpg",
-        blank=True,
+        default=None,
+        null=True,
         help_text=_("Background shown during execution"),
     )
 
     @property
-    def background_url(self) -> Optional[str]:
+    def background_url(self) -> str:
         """Get the URL to the background image. If the name is /static or starts with http
         it is returned as-is"""
         if not self.background:
-            return None
+            return "/static/dist/assets/images/flow_background.jpg"
         if self.background.name.startswith("http") or self.background.name.startswith(
             "/static"
         ):

schema.yml

@@ -17276,7 +17276,6 @@ components:
             flow is redirect to when an un-authenticated user visits authentik.
         background:
           type: string
-          nullable: true
           readOnly: true
         stages:
           type: array