knative.dev/pkg@v0.0.0-20260602142205-ac97e43f6622/resolver/authenticatable_resolver.go (about)

     1  /*
     2  Copyright 2024 The Knative Authors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package resolver
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  
    23  	"k8s.io/apimachinery/pkg/runtime/schema"
    24  	"k8s.io/client-go/tools/cache"
    25  
    26  	corev1 "k8s.io/api/core/v1"
    27  	apierrs "k8s.io/apimachinery/pkg/api/errors"
    28  	"k8s.io/apimachinery/pkg/api/meta"
    29  	"knative.dev/pkg/client/injection/ducks/duck/v1/authstatus"
    30  	"knative.dev/pkg/controller"
    31  
    32  	pkgapisduck "knative.dev/pkg/apis/duck"
    33  	duckv1 "knative.dev/pkg/apis/duck/v1"
    34  	"knative.dev/pkg/tracker"
    35  )
    36  
    37  // AuthenticatableResolver resolves ObjectReferences into a AuthenticatableType.
    38  type AuthenticatableResolver struct {
    39  	tracker       tracker.Interface
    40  	listerFactory func(schema.GroupVersionResource) (cache.GenericLister, error)
    41  }
    42  
    43  // NewAuthenticatableResolverFromTracker constructs a new AuthenticatableResolver with context and a tracker.
    44  func NewAuthenticatableResolverFromTracker(ctx context.Context, t tracker.Interface) *AuthenticatableResolver {
    45  	ret := &AuthenticatableResolver{
    46  		tracker: t,
    47  	}
    48  
    49  	informerFactory := &pkgapisduck.CachedInformerFactory{
    50  		Delegate: &pkgapisduck.EnqueueInformerFactory{
    51  			Delegate:     authstatus.Get(ctx),
    52  			EventHandler: controller.HandleAll(ret.tracker.OnChanged),
    53  		},
    54  	}
    55  
    56  	ret.listerFactory = func(gvr schema.GroupVersionResource) (cache.GenericLister, error) {
    57  		_, l, err := informerFactory.Get(ctx, gvr)
    58  		return l, err
    59  	}
    60  
    61  	return ret
    62  }
    63  
    64  // AuthStatusFromObjectReference returns the AuthStatus from an object
    65  func (r *AuthenticatableResolver) AuthStatusFromObjectReference(ref *corev1.ObjectReference, parent interface{}) (*duckv1.AuthStatus, error) {
    66  	if ref == nil {
    67  		return nil, apierrs.NewBadRequest("ref is nil")
    68  	}
    69  
    70  	authenticatable, err := r.authenticatableFromObjectReference(ref, parent)
    71  	if err != nil {
    72  		return nil, fmt.Errorf("failed to get authenticatable %s/%s: %w", ref.Namespace, ref.Name, err)
    73  	}
    74  
    75  	if authenticatable.Status.Auth == nil {
    76  		return nil, fmt.Errorf(".status.auth is missing in object %s/%s", ref.Namespace, ref.Name)
    77  	}
    78  
    79  	return authenticatable.Status.Auth, nil
    80  }
    81  
    82  // authenticatableFromObjectReference resolves an object reference into an AuthenticatableType
    83  func (r *AuthenticatableResolver) authenticatableFromObjectReference(ref *corev1.ObjectReference, parent interface{}) (*duckv1.AuthenticatableType, error) {
    84  	if ref == nil {
    85  		return nil, apierrs.NewBadRequest("ref is nil")
    86  	}
    87  
    88  	gvr, _ := meta.UnsafeGuessKindToResource(ref.GroupVersionKind())
    89  	if err := r.tracker.TrackReference(tracker.Reference{
    90  		APIVersion: ref.APIVersion,
    91  		Kind:       ref.Kind,
    92  		Namespace:  ref.Namespace,
    93  		Name:       ref.Name,
    94  	}, parent); err != nil {
    95  		return nil, fmt.Errorf("failed to track reference %s %s/%s: %w", gvr.String(), ref.Namespace, ref.Name, err)
    96  	}
    97  
    98  	lister, err := r.listerFactory(gvr)
    99  	if err != nil {
   100  		return nil, fmt.Errorf("failed to get lister for %s: %w", gvr.String(), err)
   101  	}
   102  
   103  	obj, err := lister.ByNamespace(ref.Namespace).Get(ref.Name)
   104  	if err != nil {
   105  		return nil, fmt.Errorf("failed to get object %s/%s: %w", ref.Namespace, ref.Name, err)
   106  	}
   107  
   108  	authenticatable, ok := obj.(*duckv1.AuthenticatableType)
   109  	if !ok {
   110  		return nil, apierrs.NewBadRequest(fmt.Sprintf("%s(%T) is not an AuthenticatableType", ref, ref))
   111  	}
   112  
   113  	// Do not modify informer copy.
   114  	authenticatable = authenticatable.DeepCopy()
   115  
   116  	return authenticatable, nil
   117  }