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glob.go
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glob.go
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//
// Copyright 2022 The Sigstore 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 config
import (
"net/url"
"path/filepath"
"strings"
)
const (
ResolvedDockerhubHost = "index.docker.io/"
// Images such as "busybox" reside in the dockerhub "library" repository
// The full resolved image reference would be index.docker.io/library/busybox
DockerhubPublicRepository = "library/"
)
// GlobMatch will attempt to:
// 1. match the glob first
// 2. When the pattern is <repository>/*, therefore missing a host,
// it should match for the resolved image digest in the form of index.docker.io/<repository>/*
// 3. When the pattern is <image>, it should match for the resolved image digest
// against the official Dockerhub repository in the form of index.docker.io/library/*
func GlobMatch(glob, image string) (bool, error) {
matched, err := filepath.Match(glob, image)
if err != nil {
return false, err
}
// If matched, return early
if matched {
return matched, nil
}
// If not matched, check if missing host and default to index.docker.io
u, err := url.Parse(glob)
if err != nil {
return false, err
}
if u.Host == "" {
dockerhubGlobPattern := ResolvedDockerhubHost
// If the image is expected to be part of the Dockerhub official "library" repository
if len(strings.Split(u.Path, "/")) < 2 {
dockerhubGlobPattern += DockerhubPublicRepository
}
dockerhubGlobPattern += glob
return filepath.Match(dockerhubGlobPattern, image)
}
return matched, nil
}