98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
package storage
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import (
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"context"
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"encoding/json"
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"fmt"
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"github.com/docker/distribution"
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dcontext "github.com/docker/distribution/context"
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"github.com/docker/distribution/manifest/manifestlist"
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"github.com/opencontainers/go-digest"
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)
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// manifestListHandler is a ManifestHandler that covers schema2 manifest lists.
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type manifestListHandler struct {
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repository distribution.Repository
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blobStore distribution.BlobStore
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ctx context.Context
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}
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var _ ManifestHandler = &manifestListHandler{}
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func (ms *manifestListHandler) Unmarshal(ctx context.Context, dgst digest.Digest, content []byte) (distribution.Manifest, error) {
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dcontext.GetLogger(ms.ctx).Debug("(*manifestListHandler).Unmarshal")
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var m manifestlist.DeserializedManifestList
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if err := json.Unmarshal(content, &m); err != nil {
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return nil, err
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}
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return &m, nil
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}
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func (ms *manifestListHandler) Put(ctx context.Context, manifestList distribution.Manifest, skipDependencyVerification bool) (digest.Digest, error) {
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dcontext.GetLogger(ms.ctx).Debug("(*manifestListHandler).Put")
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m, ok := manifestList.(*manifestlist.DeserializedManifestList)
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if !ok {
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return "", fmt.Errorf("wrong type put to manifestListHandler: %T", manifestList)
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}
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if err := ms.verifyManifest(ms.ctx, *m, skipDependencyVerification); err != nil {
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return "", err
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}
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mt, payload, err := m.Payload()
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if err != nil {
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return "", err
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}
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revision, err := ms.blobStore.Put(ctx, mt, payload)
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if err != nil {
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dcontext.GetLogger(ctx).Errorf("error putting payload into blobstore: %v", err)
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return "", err
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}
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return revision.Digest, nil
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}
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// verifyManifest ensures that the manifest content is valid from the
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// perspective of the registry. As a policy, the registry only tries to
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// store valid content, leaving trust policies of that content up to
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// consumers.
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func (ms *manifestListHandler) verifyManifest(ctx context.Context, mnfst manifestlist.DeserializedManifestList, skipDependencyVerification bool) error {
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var errs distribution.ErrManifestVerification
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if mnfst.SchemaVersion != 2 {
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return fmt.Errorf("unrecognized manifest list schema version %d", mnfst.SchemaVersion)
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}
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if !skipDependencyVerification {
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// This manifest service is different from the blob service
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// returned by Blob. It uses a linked blob store to ensure that
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// only manifests are accessible.
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manifestService, err := ms.repository.Manifests(ctx)
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if err != nil {
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return err
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}
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for _, manifestDescriptor := range mnfst.References() {
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exists, err := manifestService.Exists(ctx, manifestDescriptor.Digest)
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if err != nil && err != distribution.ErrBlobUnknown {
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errs = append(errs, err)
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}
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if err != nil || !exists {
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// On error here, we always append unknown blob errors.
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errs = append(errs, distribution.ErrManifestBlobUnknown{Digest: manifestDescriptor.Digest})
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}
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}
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}
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if len(errs) != 0 {
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return errs
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}
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return nil
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}
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