mirror of https://github.com/kubernetes/kops.git
119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
/*
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Copyright 2024 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package assetdata
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import (
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"embed"
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"fmt"
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"io/fs"
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"net/url"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/kops/util/pkg/hashing"
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"sigs.k8s.io/yaml"
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)
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//go:embed *.yaml
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var embeddedDataFS embed.FS
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// GetHash returns the stored hash for the well-known asset, looking it up by the canonicalURL.
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// If found, it returns (hash, true, nil)
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// If not found, it returns (nil, false, nil)
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func GetHash(canonicalURL *url.URL) (*hashing.Hash, bool, error) {
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var allMatches []*file
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if err := fs.WalkDir(embeddedDataFS, ".", func(p string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if d.IsDir() {
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return nil
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}
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b, err := fs.ReadFile(embeddedDataFS, p)
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if err != nil {
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return fmt.Errorf("reading embedded file %q: %w", p, err)
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}
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manifest, err := parseManifestFile(b)
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if err != nil {
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return fmt.Errorf("parsing embedded file %q: %w", p, err)
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}
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matches := manifest.Matches(canonicalURL.String())
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allMatches = append(allMatches, matches...)
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return nil
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}); err != nil {
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return nil, false, fmt.Errorf("walking embedded data: %w", err)
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}
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hashes := sets.New[string]()
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for _, match := range allMatches {
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hashes.Insert(match.SHA256)
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}
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if len(hashes) == 0 {
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return nil, false, nil
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}
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if len(hashes) > 1 {
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return nil, false, fmt.Errorf("found multiple matches for asset %q", canonicalURL)
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}
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h, err := hashing.FromString(hashes.UnsortedList()[0])
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if err != nil {
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return nil, false, err
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}
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return h, true, nil
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}
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type file struct {
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Name string `json:"name,omitempty"`
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SHA256 string `json:"sha256,omitempty"`
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}
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type fileStore struct {
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Base string `json:"base,omitempty"`
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}
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type manifest struct {
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FileStores []fileStore `json:"filestores,omitempty"`
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Files []file `json:"files,omitempty"`
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}
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func parseManifestFile(b []byte) (*manifest, error) {
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m := &manifest{}
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if err := yaml.Unmarshal(b, m); err != nil {
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return nil, fmt.Errorf("parsing yaml: %w", err)
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}
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return m, nil
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}
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func (m *manifest) Matches(canonicalURL string) []*file {
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var matches []*file
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for _, fileStore := range m.FileStores {
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if !strings.HasPrefix(canonicalURL, fileStore.Base) {
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continue
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}
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relativePath := strings.TrimPrefix(canonicalURL, fileStore.Base)
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for i := range m.Files {
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f := &m.Files[i]
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if f.Name == relativePath {
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matches = append(matches, f)
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}
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}
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}
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return matches
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}
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