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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package container
import (
"fmt"
"io"
"strings"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/packages/container/helm"
"code.gitea.io/gitea/modules/validation"
oci "github.com/opencontainers/image-spec/specs-go/v1"
)
const (
PropertyRepository = "container.repository"
PropertyDigest = "container.digest"
PropertyMediaType = "container.mediatype"
PropertyManifestTagged = "container.manifest.tagged"
PropertyManifestReference = "container.manifest.reference"
DefaultPlatform = "linux/amd64"
labelLicenses = "org.opencontainers.image.licenses"
labelURL = "org.opencontainers.image.url"
labelSource = "org.opencontainers.image.source"
labelDocumentation = "org.opencontainers.image.documentation"
labelDescription = "org.opencontainers.image.description"
labelAuthors = "org.opencontainers.image.authors"
)
type ImageType string
const (
TypeOCI ImageType = "oci"
TypeHelm ImageType = "helm"
)
// Name gets the name of the image type
func (it ImageType) Name() string {
switch it {
case TypeHelm:
return "Helm Chart"
default:
return "OCI / Docker"
}
}
// Metadata represents the metadata of a Container package
type Metadata struct {
Type ImageType `json:"type"`
IsTagged bool `json:"is_tagged"`
Platform string `json:"platform,omitempty"`
Description string `json:"description,omitempty"`
Authors []string `json:"authors,omitempty"`
Licenses string `json:"license,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
RepositoryURL string `json:"repository_url,omitempty"`
DocumentationURL string `json:"documentation_url,omitempty"`
Labels map[string]string `json:"labels,omitempty"`
ImageLayers []string `json:"layer_creation,omitempty"`
Manifests []*Manifest `json:"manifests,omitempty"`
}
type Manifest struct {
Platform string `json:"platform"`
Digest string `json:"digest"`
Size int64 `json:"size"`
}
// ParseImageConfig parses the metadata of an image config
func ParseImageConfig(mt string, r io.Reader) (*Metadata, error) {
if strings.EqualFold(mt, helm.ConfigMediaType) {
return parseHelmConfig(r)
}
// fallback to OCI Image Config
return parseOCIImageConfig(r)
}
func parseOCIImageConfig(r io.Reader) (*Metadata, error) {
var image oci.Image
if err := json.NewDecoder(r).Decode(&image); err != nil {
return nil, err
}
platform := DefaultPlatform
if image.OS != "" && image.Architecture != "" {
platform = fmt.Sprintf("%s/%s", image.OS, image.Architecture)
if image.Variant != "" {
platform = fmt.Sprintf("%s/%s", platform, image.Variant)
}
}
imageLayers := make([]string, 0, len(image.History))
for _, history := range image.History {
cmd := history.CreatedBy
if i := strings.Index(cmd, "#(nop) "); i != -1 {
cmd = strings.TrimSpace(cmd[i+7:])
}
if cmd != "" {
imageLayers = append(imageLayers, cmd)
}
}
metadata := &Metadata{
Type: TypeOCI,
Platform: platform,
Licenses: image.Config.Labels[labelLicenses],
ProjectURL: image.Config.Labels[labelURL],
RepositoryURL: image.Config.Labels[labelSource],
DocumentationURL: image.Config.Labels[labelDocumentation],
Description: image.Config.Labels[labelDescription],
Labels: image.Config.Labels,
ImageLayers: imageLayers,
}
if authors, ok := image.Config.Labels[labelAuthors]; ok {
metadata.Authors = []string{authors}
}
if !validation.IsValidURL(metadata.ProjectURL) {
metadata.ProjectURL = ""
}
if !validation.IsValidURL(metadata.RepositoryURL) {
metadata.RepositoryURL = ""
}
if !validation.IsValidURL(metadata.DocumentationURL) {
metadata.DocumentationURL = ""
}
return metadata, nil
}
func parseHelmConfig(r io.Reader) (*Metadata, error) {
var config helm.Metadata
if err := json.NewDecoder(r).Decode(&config); err != nil {
return nil, err
}
metadata := &Metadata{
Type: TypeHelm,
Description: config.Description,
ProjectURL: config.Home,
}
if len(config.Maintainers) > 0 {
authors := make([]string, 0, len(config.Maintainers))
for _, maintainer := range config.Maintainers {
authors = append(authors, maintainer.Name)
}
metadata.Authors = authors
}
if len(config.Sources) > 0 && validation.IsValidURL(config.Sources[0]) {
metadata.RepositoryURL = config.Sources[0]
}
if !validation.IsValidURL(metadata.ProjectURL) {
metadata.ProjectURL = ""
}
return metadata, nil
}
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