136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
package storage
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/url"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/manifest/schema1"
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"github.com/docker/distribution/manifest/schema2"
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"github.com/opencontainers/go-digest"
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)
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var (
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errUnexpectedURL = errors.New("unexpected URL on layer")
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errMissingURL = errors.New("missing URL on layer")
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errInvalidURL = errors.New("invalid URL on layer")
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)
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//schema2ManifestHandler is a ManifestHandler that covers schema2 manifests.
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type schema2ManifestHandler 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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manifestURLs manifestURLs
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}
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var _ ManifestHandler = &schema2ManifestHandler{}
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func (ms *schema2ManifestHandler) Unmarshal(ctx context.Context, dgst digest.Digest, content []byte) (distribution.Manifest, error) {
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context.GetLogger(ms.ctx).Debug("(*schema2ManifestHandler).Unmarshal")
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var m schema2.DeserializedManifest
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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 *schema2ManifestHandler) Put(ctx context.Context, manifest distribution.Manifest, skipDependencyVerification bool) (digest.Digest, error) {
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context.GetLogger(ms.ctx).Debug("(*schema2ManifestHandler).Put")
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m, ok := manifest.(*schema2.DeserializedManifest)
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if !ok {
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return "", fmt.Errorf("non-schema2 manifest put to schema2ManifestHandler: %T", manifest)
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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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context.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 store
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// valid content, leaving trust policies of that content up to consumers.
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func (ms *schema2ManifestHandler) verifyManifest(ctx context.Context, mnfst schema2.DeserializedManifest, skipDependencyVerification bool) error {
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var errs distribution.ErrManifestVerification
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if skipDependencyVerification {
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return nil
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}
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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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blobsService := ms.repository.Blobs(ctx)
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for _, descriptor := range mnfst.References() {
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var err error
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switch descriptor.MediaType {
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case schema2.MediaTypeForeignLayer:
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// Clients download this layer from an external URL, so do not check for
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// its presense.
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if len(descriptor.URLs) == 0 {
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err = errMissingURL
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}
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allow := ms.manifestURLs.allow
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deny := ms.manifestURLs.deny
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for _, u := range descriptor.URLs {
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var pu *url.URL
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pu, err = url.Parse(u)
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if err != nil || (pu.Scheme != "http" && pu.Scheme != "https") || pu.Fragment != "" || (allow != nil && !allow.MatchString(u)) || (deny != nil && deny.MatchString(u)) {
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err = errInvalidURL
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break
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}
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}
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case schema2.MediaTypeManifest, schema1.MediaTypeManifest:
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var exists bool
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exists, err = manifestService.Exists(ctx, descriptor.Digest)
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if err != nil || !exists {
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err = distribution.ErrBlobUnknown // just coerce to unknown.
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}
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fallthrough // double check the blob store.
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default:
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// forward all else to blob storage
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if len(descriptor.URLs) == 0 {
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_, err = blobsService.Stat(ctx, descriptor.Digest)
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}
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}
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if err != nil {
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if err != distribution.ErrBlobUnknown {
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errs = append(errs, err)
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}
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// On error here, we always append unknown blob errors.
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errs = append(errs, distribution.ErrManifestBlobUnknown{Digest: descriptor.Digest})
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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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