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92 lines
2.7 KiB
92 lines
2.7 KiB
// Copyright 2020 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package match provides functionality for conveniently matching a v1.Descriptor.
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package match
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import (
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v1 "github.com/google/go-containerregistry/pkg/v1"
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imagespec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// Matcher function that is given a v1.Descriptor, and returns whether or
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// not it matches a given rule. Can match on anything it wants in the Descriptor.
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type Matcher func(desc v1.Descriptor) bool
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// Name returns a match.Matcher that matches based on the value of the
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//
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// "org.opencontainers.image.ref.name" annotation:
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//
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// github.com/opencontainers/image-spec/blob/v1.0.1/annotations.md#pre-defined-annotation-keys
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func Name(name string) Matcher {
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return Annotation(imagespec.AnnotationRefName, name)
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}
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// Annotation returns a match.Matcher that matches based on the provided annotation.
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func Annotation(key, value string) Matcher {
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return func(desc v1.Descriptor) bool {
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if desc.Annotations == nil {
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return false
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}
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if aValue, ok := desc.Annotations[key]; ok && aValue == value {
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return true
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}
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return false
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}
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}
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// Platforms returns a match.Matcher that matches on any one of the provided platforms.
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// Ignores any descriptors that do not have a platform.
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func Platforms(platforms ...v1.Platform) Matcher {
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return func(desc v1.Descriptor) bool {
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if desc.Platform == nil {
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return false
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}
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for _, platform := range platforms {
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if desc.Platform.Equals(platform) {
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return true
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}
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}
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return false
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}
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}
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// MediaTypes returns a match.Matcher that matches at least one of the provided media types.
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func MediaTypes(mediaTypes ...string) Matcher {
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mts := map[string]bool{}
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for _, media := range mediaTypes {
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mts[media] = true
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}
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return func(desc v1.Descriptor) bool {
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if desc.MediaType == "" {
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return false
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}
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if _, ok := mts[string(desc.MediaType)]; ok {
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return true
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}
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return false
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}
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}
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// Digests returns a match.Matcher that matches at least one of the provided Digests
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func Digests(digests ...v1.Hash) Matcher {
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digs := map[v1.Hash]bool{}
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for _, digest := range digests {
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digs[digest] = true
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}
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return func(desc v1.Descriptor) bool {
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_, ok := digs[desc.Digest]
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return ok
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}
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}
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