refactor: move project func

Signed-off-by: Alex Pana <8968914+acpana@users.noreply.github.com>

apis/refs/v1beta1/computenetworkref.go

@@ -0,0 +1,98 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1beta1
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+type ComputeNetwork struct {
+	Project          string
+	ComputeNetworkID string
+}
+
+func (c *ComputeNetwork) String() string {
+	return fmt.Sprintf("projects/%s/global/networks/%s", c.Project, c.ComputeNetworkID)
+}
+
+func ResolveComputeNetwork(ctx context.Context, reader client.Reader, src client.Object, ref *ComputeNetworkRef) (*ComputeNetwork, error) {
+	if ref == nil {
+		return nil, nil
+	}
+
+	if ref.External != "" {
+		if ref.Name != "" {
+			return nil, fmt.Errorf("cannot specify both name and external on computenetwork reference")
+		}
+
+		tokens := strings.Split(ref.External, "/")
+		if len(tokens) == 5 && tokens[0] == "projects" && tokens[2] == "global" && tokens[3] == "networks" {
+			return &ComputeNetwork{
+				Project:          tokens[1],
+				ComputeNetworkID: tokens[4]}, nil
+		}
+		return nil, fmt.Errorf("format of computenetwork external=%q was not known (use projects/<projectId>/global/networks/<networkid>)", ref.External)
+	}
+
+	if ref.Name == "" {
+		return nil, fmt.Errorf("must specify either name or external on computenetwork reference")
+	}
+
+	key := types.NamespacedName{
+		Namespace: ref.Namespace,
+		Name:      ref.Name,
+	}
+	if key.Namespace == "" {
+		key.Namespace = src.GetNamespace()
+	}
+
+	computenetwork := &unstructured.Unstructured{}
+	computenetwork.SetGroupVersionKind(schema.GroupVersionKind{
+		Group:   "compute.cnrm.cloud.google.com",
+		Version: "v1beta1",
+		Kind:    "ComputeNetwork",
+	})
+	if err := reader.Get(ctx, key, computenetwork); err != nil {
+		if apierrors.IsNotFound(err) {
+			return nil, fmt.Errorf("referenced ComputeNetwork %v not found", key)
+		}
+		return nil, fmt.Errorf("error reading referenced ComputeNetwork %v: %w", key, err)
+	}
+
+	computenetworkID, _, err := unstructured.NestedString(computenetwork.Object, "spec", "resourceID")
+	if err != nil {
+		return nil, fmt.Errorf("reading spec.resourceID from ComputeNetwork %v: %w", key, err)
+	}
+	if computenetworkID == "" {
+		computenetworkID = computenetwork.GetName()
+	}
+
+	computeNetworkProjectID, err := ResolveProjectIDForObject(ctx, reader, computenetwork)
+	if err != nil {
+		return nil, err
+	}
+	return &ComputeNetwork{
+		Project:          computeNetworkProjectID,
+		ComputeNetworkID: computenetworkID,
+	}, nil
+}