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110 lines
2.3 KiB
Go
110 lines
2.3 KiB
Go
package imagetools
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import (
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"bytes"
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"context"
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"io"
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"net/http"
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"github.com/containerd/containerd/remotes"
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"github.com/containerd/containerd/remotes/docker"
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clitypes "github.com/docker/cli/cli/config/types"
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"github.com/docker/distribution/reference"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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type Auth interface {
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GetAuthConfig(registryHostname string) (clitypes.AuthConfig, error)
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}
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type Opt struct {
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Auth Auth
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}
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type Resolver struct {
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r remotes.Resolver
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}
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func New(opt Opt) *Resolver {
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resolver := docker.NewResolver(docker.ResolverOptions{
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Client: http.DefaultClient,
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Credentials: toCredentialsFunc(opt.Auth),
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})
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return &Resolver{
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r: resolver,
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}
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}
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func (r *Resolver) Resolve(ctx context.Context, in string) (string, ocispec.Descriptor, error) {
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ref, err := parseRef(in)
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if err != nil {
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return "", ocispec.Descriptor{}, err
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}
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in, desc, err := r.r.Resolve(ctx, ref.String())
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if err != nil {
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return "", ocispec.Descriptor{}, err
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}
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return in, desc, nil
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}
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func (r *Resolver) Get(ctx context.Context, in string) ([]byte, ocispec.Descriptor, error) {
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in, desc, err := r.Resolve(ctx, in)
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if err != nil {
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return nil, ocispec.Descriptor{}, err
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}
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dt, err := r.GetDescriptor(ctx, in, desc)
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if err != nil {
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return nil, ocispec.Descriptor{}, err
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}
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return dt, desc, nil
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}
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func (r *Resolver) GetDescriptor(ctx context.Context, in string, desc ocispec.Descriptor) ([]byte, error) {
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fetcher, err := r.r.Fetcher(ctx, in)
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if err != nil {
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return nil, err
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}
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rc, err := fetcher.Fetch(ctx, desc)
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if err != nil {
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return nil, err
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}
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buf := &bytes.Buffer{}
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_, err = io.Copy(buf, rc)
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rc.Close()
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func parseRef(s string) (reference.Named, error) {
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ref, err := reference.ParseNormalizedNamed(s)
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if err != nil {
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return nil, err
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}
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ref = reference.TagNameOnly(ref)
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return ref, nil
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}
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func toCredentialsFunc(a Auth) func(string) (string, string, error) {
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return func(host string) (string, string, error) {
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if host == "registry-1.docker.io" {
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host = "https://index.docker.io/v1/"
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}
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ac, err := a.GetAuthConfig(host)
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if err != nil {
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return "", "", err
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}
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if ac.IdentityToken != "" {
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return "", ac.IdentityToken, nil
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}
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return ac.Username, ac.Password, nil
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}
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}
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