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|
package storage
import (
"context"
"errors"
"fmt"
"net/url"
"github.com/docker/distribution"
dcontext "github.com/docker/distribution/context"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/manifest/schema2"
"github.com/opencontainers/go-digest"
)
var (
errMissingURL = errors.New("missing URL on layer")
errInvalidURL = errors.New("invalid URL on layer")
)
//schema2ManifestHandler is a ManifestHandler that covers schema2 manifests.
type schema2ManifestHandler struct {
repository distribution.Repository
blobStore distribution.BlobStore
ctx context.Context
manifestURLs manifestURLs
}
var _ ManifestHandler = &schema2ManifestHandler{}
func (ms *schema2ManifestHandler) Unmarshal(ctx context.Context, dgst digest.Digest, content []byte) (distribution.Manifest, error) {
dcontext.GetLogger(ms.ctx).Debug("(*schema2ManifestHandler).Unmarshal")
m := &schema2.DeserializedManifest{}
if err := m.UnmarshalJSON(content); err != nil {
return nil, err
}
return m, nil
}
func (ms *schema2ManifestHandler) Put(ctx context.Context, manifest distribution.Manifest, skipDependencyVerification bool) (digest.Digest, error) {
dcontext.GetLogger(ms.ctx).Debug("(*schema2ManifestHandler).Put")
m, ok := manifest.(*schema2.DeserializedManifest)
if !ok {
return "", fmt.Errorf("non-schema2 manifest put to schema2ManifestHandler: %T", manifest)
}
if err := ms.verifyManifest(ms.ctx, *m, skipDependencyVerification); err != nil {
return "", err
}
mt, payload, err := m.Payload()
if err != nil {
return "", err
}
revision, err := ms.blobStore.Put(ctx, mt, payload)
if err != nil {
dcontext.GetLogger(ctx).Errorf("error putting payload into blobstore: %v", err)
return "", err
}
return revision.Digest, nil
}
// verifyManifest ensures that the manifest content is valid from the
// perspective of the registry. As a policy, the registry only tries to store
// valid content, leaving trust policies of that content up to consumers.
func (ms *schema2ManifestHandler) verifyManifest(ctx context.Context, mnfst schema2.DeserializedManifest, skipDependencyVerification bool) error {
var errs distribution.ErrManifestVerification
if mnfst.Manifest.SchemaVersion != 2 {
return fmt.Errorf("unrecognized manifest schema version %d", mnfst.Manifest.SchemaVersion)
}
if skipDependencyVerification {
return nil
}
manifestService, err := ms.repository.Manifests(ctx)
if err != nil {
return err
}
blobsService := ms.repository.Blobs(ctx)
for _, descriptor := range mnfst.References() {
var err error
switch descriptor.MediaType {
case schema2.MediaTypeForeignLayer:
// Clients download this layer from an external URL, so do not check for
// its presence.
if len(descriptor.URLs) == 0 {
err = errMissingURL
}
allow := ms.manifestURLs.allow
deny := ms.manifestURLs.deny
for _, u := range descriptor.URLs {
var pu *url.URL
pu, err = url.Parse(u)
if err != nil || (pu.Scheme != "http" && pu.Scheme != "https") || pu.Fragment != "" || (allow != nil && !allow.MatchString(u)) || (deny != nil && deny.MatchString(u)) {
err = errInvalidURL
break
}
}
case schema2.MediaTypeManifest, schema1.MediaTypeManifest:
var exists bool
exists, err = manifestService.Exists(ctx, descriptor.Digest)
if err != nil || !exists {
err = distribution.ErrBlobUnknown // just coerce to unknown.
}
fallthrough // double check the blob store.
default:
// forward all else to blob storage
if len(descriptor.URLs) == 0 {
_, err = blobsService.Stat(ctx, descriptor.Digest)
}
}
if err != nil {
if err != distribution.ErrBlobUnknown {
errs = append(errs, err)
}
// On error here, we always append unknown blob errors.
errs = append(errs, distribution.ErrManifestBlobUnknown{Digest: descriptor.Digest})
}
}
if len(errs) != 0 {
return errs
}
return nil
}
|
