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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 types holds common OCI media types.
package types
// MediaType is an enumeration of the supported mime types that an element of an image might have.
type MediaType string
// The collection of known MediaType values.
const (
OCIContentDescriptor MediaType = "application/vnd.oci.descriptor.v1+json"
OCIImageIndex MediaType = "application/vnd.oci.image.index.v1+json"
OCIManifestSchema1 MediaType = "application/vnd.oci.image.manifest.v1+json"
OCIConfigJSON MediaType = "application/vnd.oci.image.config.v1+json"
OCILayer MediaType = "application/vnd.oci.image.layer.v1.tar+gzip"
OCILayerZStd MediaType = "application/vnd.oci.image.layer.v1.tar+zstd"
OCIRestrictedLayer MediaType = "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip"
OCIUncompressedLayer MediaType = "application/vnd.oci.image.layer.v1.tar"
OCIUncompressedRestrictedLayer MediaType = "application/vnd.oci.image.layer.nondistributable.v1.tar"
DockerManifestSchema1 MediaType = "application/vnd.docker.distribution.manifest.v1+json"
DockerManifestSchema1Signed MediaType = "application/vnd.docker.distribution.manifest.v1+prettyjws"
DockerManifestSchema2 MediaType = "application/vnd.docker.distribution.manifest.v2+json"
DockerManifestList MediaType = "application/vnd.docker.distribution.manifest.list.v2+json"
DockerLayer MediaType = "application/vnd.docker.image.rootfs.diff.tar.gzip"
DockerConfigJSON MediaType = "application/vnd.docker.container.image.v1+json"
DockerPluginConfig MediaType = "application/vnd.docker.plugin.v1+json"
DockerForeignLayer MediaType = "application/vnd.docker.image.rootfs.foreign.diff.tar.gzip"
DockerUncompressedLayer MediaType = "application/vnd.docker.image.rootfs.diff.tar"
OCIVendorPrefix = "vnd.oci"
DockerVendorPrefix = "vnd.docker"
)
// IsDistributable returns true if a layer is distributable, see:
// https://github.com/opencontainers/image-spec/blob/master/layer.md#non-distributable-layers
func (m MediaType) IsDistributable() bool {
switch m {
case DockerForeignLayer, OCIRestrictedLayer, OCIUncompressedRestrictedLayer:
return false
}
return true
}
// IsImage returns true if the mediaType represents an image manifest, as opposed to something else, like an index.
func (m MediaType) IsImage() bool {
switch m {
case OCIManifestSchema1, DockerManifestSchema2:
return true
}
return false
}
// IsIndex returns true if the mediaType represents an index, as opposed to something else, like an image.
func (m MediaType) IsIndex() bool {
switch m {
case OCIImageIndex, DockerManifestList:
return true
}
return false
}
// IsConfig returns true if the mediaType represents a config, as opposed to something else, like an image.
func (m MediaType) IsConfig() bool {
switch m {
case OCIConfigJSON, DockerConfigJSON:
return true
}
return false
}
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