forked from mirrors/docker-distribution
f1f610c6cd
It was probably ill-advised to couple manifest signing and verification to their respective types. This changeset simply changes them from methods to functions. These might not even be in this package in the future. Signed-off-by: Stephen J Day <stephen.day@docker.com>
88 lines
2.7 KiB
Go
88 lines
2.7 KiB
Go
package manifest
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import (
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"encoding/json"
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"github.com/docker/distribution/digest"
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)
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// Versioned provides a struct with just the manifest schemaVersion. Incoming
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// content with unknown schema version can be decoded against this struct to
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// check the version.
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type Versioned struct {
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// SchemaVersion is the image manifest schema that this image follows
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SchemaVersion int `json:"schemaVersion"`
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}
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// Manifest provides the base accessible fields for working with V2 image
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// format in the registry.
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type Manifest struct {
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Versioned
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// Name is the name of the image's repository
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Name string `json:"name"`
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// Tag is the tag of the image specified by this manifest
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Tag string `json:"tag"`
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// Architecture is the host architecture on which this image is intended to
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// run
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Architecture string `json:"architecture"`
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// FSLayers is a list of filesystem layer blobSums contained in this image
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FSLayers []FSLayer `json:"fsLayers"`
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// History is a list of unstructured historical data for v1 compatibility
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History []ManifestHistory `json:"history"`
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}
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// SignedManifest provides an envelope for a signed image manifest, including
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// the format sensitive raw bytes. It contains fields to
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type SignedManifest struct {
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Manifest
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// Raw is the byte representation of the ImageManifest, used for signature
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// verification. The value of Raw must be used directly during
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// serialization, or the signature check will fail. The manifest byte
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// representation cannot change or it will have to be re-signed.
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Raw []byte `json:"-"`
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}
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// UnmarshalJSON populates a new ImageManifest struct from JSON data.
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func (sm *SignedManifest) UnmarshalJSON(b []byte) error {
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var manifest Manifest
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if err := json.Unmarshal(b, &manifest); err != nil {
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return err
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}
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sm.Manifest = manifest
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sm.Raw = make([]byte, len(b), len(b))
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copy(sm.Raw, b)
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return nil
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}
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// MarshalJSON returns the contents of raw. If Raw is nil, marshals the inner
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// contents. Applications requiring a marshaled signed manifest should simply
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// use Raw directly, since the the content produced by json.Marshal will be
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// compacted and will fail signature checks.
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func (sm *SignedManifest) MarshalJSON() ([]byte, error) {
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if len(sm.Raw) > 0 {
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return sm.Raw, nil
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}
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// If the raw data is not available, just dump the inner content.
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return json.Marshal(&sm.Manifest)
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}
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// FSLayer is a container struct for BlobSums defined in an image manifest
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type FSLayer struct {
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// BlobSum is the tarsum of the referenced filesystem image layer
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BlobSum digest.Digest `json:"blobSum"`
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}
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// ManifestHistory stores unstructured v1 compatibility information
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type ManifestHistory struct {
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// V1Compatibility is the raw v1 compatibility information
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V1Compatibility string `json:"v1Compatibility"`
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}
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