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/
manifest.go
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/
manifest.go
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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 registry
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"net/http"
"strings"
"sync"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/dhnt/oci/pkg/registry/image"
"github.com/dhnt/oci/pkg/registry/store"
)
type manifest struct {
contentType string
blob []byte
digest string // computed
}
type manifests struct {
// maps repo -> manifest tag/digest -> manifest
manifests map[string]map[string]*manifest
lock sync.Mutex
cidCache *cidCache
registry *registry
}
func isManifest(req *http.Request) bool {
elems := strings.Split(req.URL.Path, "/")
elems = elems[1:]
if len(elems) < 4 {
return false
}
return elems[len(elems)-2] == "manifests"
}
// https://github.com/opencontainers/distribution-spec/blob/master/spec.md#pulling-an-image-manifest
// https://github.com/opencontainers/distribution-spec/blob/master/spec.md#pushing-an-image
func (m *manifests) handle(resp http.ResponseWriter, req *http.Request) *regError {
elem := strings.Split(req.URL.Path, "/")
elem = elem[1:]
target := elem[len(elem)-1]
repo := strings.Join(elem[1:len(elem)-2], "/")
if req.Method == "GET" {
m.lock.Lock()
defer m.lock.Unlock()
mf, err := m.fetch(repo, target)
if err != nil {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_UNKNOWN",
Message: err.Error(),
}
}
// Prepare reverse lookup by digest for pulling blobs from IPFS
cid, err := m.registry.resolveCID(repo, target)
if err != nil {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_UNKNOWN",
Message: err.Error(),
}
}
f, _ := image.DecodeManifest(mf.blob)
for _, d := range f.Digests() {
m.cidCache.Add(repo, d, cid)
}
resp.Header().Set("Docker-Content-Digest", mf.digest)
resp.Header().Set("X-Docker-Content-ID", cid)
resp.Header().Set("Content-Type", mf.contentType)
resp.Header().Set("Content-Length", fmt.Sprint(len(mf.blob)))
resp.WriteHeader(http.StatusOK)
io.Copy(resp, bytes.NewReader(mf.blob))
return nil
}
if req.Method == "HEAD" {
m.lock.Lock()
defer m.lock.Unlock()
mf, err := m.fetch(repo, target)
if err != nil {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_UNKNOWN",
Message: err.Error(),
}
}
resp.Header().Set("Docker-Content-Digest", mf.digest)
resp.Header().Set("Content-Type", mf.contentType)
resp.Header().Set("Content-Length", fmt.Sprint(len(mf.blob)))
resp.WriteHeader(http.StatusOK)
return nil
}
if req.Method == "PUT" {
m.lock.Lock()
defer m.lock.Unlock()
if _, ok := m.manifests[repo]; !ok {
m.manifests[repo] = map[string]*manifest{}
}
b := &bytes.Buffer{}
io.Copy(b, req.Body)
digest := computeDigest(b.Bytes())
mf := manifest{
blob: b.Bytes(),
contentType: req.Header.Get("Content-Type"),
}
// If the manifest is a manifest list, check that the manifest
// list's constituent manifests are already uploaded.
// This isn't strictly required by the registry API, but some
// registries require this.
if mf.contentType == string(types.OCIImageIndex) ||
mf.contentType == string(types.DockerManifestList) {
im, err := v1.ParseIndexManifest(b)
if err != nil {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_UNKNOWN",
Message: err.Error(),
}
}
for _, desc := range im.Manifests {
if _, found := m.manifests[repo][desc.Digest.String()]; !found {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_UNKNOWN",
Message: fmt.Sprintf("Sub-manifest %q not found", desc.Digest),
}
}
}
}
// Allow future references by target (tag) and immutable digest.
// See https://docs.docker.com/engine/reference/commandline/pull/#pull-an-image-by-digest-immutable-identifier.
m.manifests[repo][target] = &mf
m.manifests[repo][digest] = &mf
layers, ok := m.registry.blobs.get(repo)
if !ok {
return ®Error{
Status: http.StatusNotFound,
Code: "MANIFEST_BLOB_UNKNOWN",
Message: fmt.Sprintf("layers for %q not found", repo),
}
}
//
m.registry.blobs.remove(repo)
refs := make(map[string][]byte)
refs[target] = mf.blob
refs[digest] = mf.blob
refs["latest"] = mf.blob // <cid>/latest
image := store.NewImage(repo, refs, layers)
cid, err := m.registry.store.Save(image)
if err != nil {
return ®Error{
Status: http.StatusInternalServerError,
Code: "",
Message: err.Error(),
}
}
m.cidCache.Add(repo, target, cid)
m.cidCache.Add(repo, digest, cid)
resp.Header().Set("Docker-Content-Digest", digest)
resp.Header().Set("X-Docker-Content-ID", cid)
resp.WriteHeader(http.StatusCreated)
return nil
}
return ®Error{
Status: http.StatusBadRequest,
Code: "METHOD_UNKNOWN",
Message: "We don't understand your method + url",
}
}
func (m *manifests) fetch(repo, target string) (*manifest, error) {
if _, ok := m.manifests[repo]; !ok {
m.manifests[repo] = map[string]*manifest{}
}
mf, ok := m.manifests[repo][target]
if ok {
return mf, nil
}
cid, err := m.registry.resolveCID(repo, target)
if err != nil {
return nil, err
}
mf, err = m.getManifest(cid, target)
if err != nil {
return nil, err
}
m.manifests[repo][target] = mf
m.manifests[repo][mf.digest] = mf
// conform to the distribution registry specification
// in case target is tag, we need to resolve also by hash.
m.cidCache.Add(repo, mf.digest, cid)
return mf, nil
}
func computeDigest(b []byte) string {
rd := sha256.Sum256(b)
d := "sha256:" + hex.EncodeToString(rd[:])
return d
}
func (m *manifests) getManifest(cid, target string) (*manifest, error) {
b, err := m.registry.store.GetManifest(cid, target)
if err != nil {
return nil, err
}
mf, err := image.DecodeManifest(b)
if err != nil {
return nil, err
}
digest := computeDigest(b)
return &manifest{
blob: b,
contentType: mf.MediaType,
digest: digest,
}, nil
}