new(pkg/oci): use functional options for creating repositories

Signed-off-by: Lorenzo Susini <[email protected]>

Author: loresuso

pkg/oci/repository.go

@@ -0,0 +1,59 @@
+// Copyright 2022 The Falco Authors
+//
+// 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 oci
+
+import (
+	"fmt"
+	"oras.land/oras-go/v2/registry/remote"
+	"oras.land/oras-go/v2/registry/remote/auth"
+)
+
+// Repository is an HTTP client to a remote repository.
+type Repository struct {
+	*remote.Repository
+}
+
+// NewRepository returns a new Repository.
+//
+// Return an error if the given ref is not valid.
+func NewRepository(ref string, options ...func(*Repository)) (*Repository, error) {
+	repo := &Repository{}
+	var err error
+
+	repo.Repository, err = remote.NewRepository(ref)
+	if err != nil {
+		return nil, fmt.Errorf("unable to create new repository with ref %s: %w", ref, err)
+	}
+
+	for _, o := range options {
+		o(repo)
+	}
+
+	return repo, nil
+}
+
+// WithClient sets the underlying HTTP client to be used for requests.
+func WithClient(client *auth.Client) func(r *Repository) {
+	return func(r *Repository) {
+		r.Client = client
+	}
+}
+
+// WithPlainHTTP specifies if requests should be done in plain http.
+func WithPlainHTTP(plainHTTP bool) func(r *Repository) {
+	return func(r *Repository) {
+		r.PlainHTTP = plainHTTP
+	}
+}