core: app entitlements (#12090)

* core: initial app entitlements

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* base off of pbm

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add tests and oauth2

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add to proxy

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* rewrite to use bindings

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make policy bindings form and list more customizable

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* double fix

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* refine permissions

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add missing rbac modal to app entitlements

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* separate scope for app entitlements

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* include entitlements mapping in proxy

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add API validation to prevent policies from being bound to entitlements

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make preview

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add initial docs

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* remove duplicate docs

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/core/api/transactional_applications.py

@@ -22,7 +22,7 @@ from authentik.blueprints.v1.common import (
 from authentik.blueprints.v1.importer import Importer
 from authentik.core.api.applications import ApplicationSerializer
 from authentik.core.api.utils import PassiveSerializer
-from authentik.core.models import Provider
+from authentik.core.models import Application, Provider
 from authentik.lib.utils.reflection import all_subclasses
 from authentik.policies.api.bindings import PolicyBindingSerializer
 
@@ -51,6 +51,13 @@ class TransactionProviderField(DictField):
 class TransactionPolicyBindingSerializer(PolicyBindingSerializer):
     """PolicyBindingSerializer which does not require target as target is set implicitly"""
 
+    def validate(self, attrs):
+        # As the PolicyBindingSerializer checks that the correct things can be bound to a target
+        # but we don't have a target here as that's set by the blueprint, pass in an empty app
+        # which will have the correct allowed combination of group/user/policy.
+        attrs["target"] = Application()
+        return super().validate(attrs)
+
     class Meta(PolicyBindingSerializer.Meta):
         fields = [x for x in PolicyBindingSerializer.Meta.fields if x != "target"]