mirror of
https://github.com/genuinetools/reg.git
synced 2024-08-26 07:50:23 -04:00
870 lines
21 KiB
Go
870 lines
21 KiB
Go
package client
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/reference"
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"github.com/docker/distribution/registry/api/v2"
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"github.com/docker/distribution/registry/client/transport"
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"github.com/docker/distribution/registry/storage/cache"
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"github.com/docker/distribution/registry/storage/cache/memory"
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"github.com/opencontainers/go-digest"
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)
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// Registry provides an interface for calling Repositories, which returns a catalog of repositories.
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type Registry interface {
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Repositories(ctx context.Context, repos []string, last string) (n int, err error)
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}
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// checkHTTPRedirect is a callback that can manipulate redirected HTTP
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// requests. It is used to preserve Accept and Range headers.
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func checkHTTPRedirect(req *http.Request, via []*http.Request) error {
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if len(via) >= 10 {
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return errors.New("stopped after 10 redirects")
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}
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if len(via) > 0 {
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for headerName, headerVals := range via[0].Header {
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if headerName != "Accept" && headerName != "Range" {
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continue
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}
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for _, val := range headerVals {
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// Don't add to redirected request if redirected
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// request already has a header with the same
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// name and value.
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hasValue := false
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for _, existingVal := range req.Header[headerName] {
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if existingVal == val {
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hasValue = true
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break
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}
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}
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if !hasValue {
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req.Header.Add(headerName, val)
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}
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}
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}
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}
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return nil
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}
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// NewRegistry creates a registry namespace which can be used to get a listing of repositories
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func NewRegistry(baseURL string, transport http.RoundTripper) (Registry, error) {
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ub, err := v2.NewURLBuilderFromString(baseURL, false)
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if err != nil {
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return nil, err
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}
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client := &http.Client{
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Transport: transport,
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Timeout: 1 * time.Minute,
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CheckRedirect: checkHTTPRedirect,
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}
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return ®istry{
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client: client,
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ub: ub,
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}, nil
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}
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type registry struct {
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client *http.Client
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ub *v2.URLBuilder
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context context.Context
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}
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// Repositories returns a lexigraphically sorted catalog given a base URL. The 'entries' slice will be filled up to the size
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// of the slice, starting at the value provided in 'last'. The number of entries will be returned along with io.EOF if there
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// are no more entries
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func (r *registry) Repositories(ctx context.Context, entries []string, last string) (int, error) {
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var numFilled int
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var returnErr error
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values := buildCatalogValues(len(entries), last)
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u, err := r.ub.BuildCatalogURL(values)
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if err != nil {
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return 0, err
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}
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resp, err := r.client.Get(u)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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if SuccessStatus(resp.StatusCode) {
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var ctlg struct {
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Repositories []string `json:"repositories"`
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}
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decoder := json.NewDecoder(resp.Body)
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if err := decoder.Decode(&ctlg); err != nil {
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return 0, err
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}
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for cnt := range ctlg.Repositories {
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entries[cnt] = ctlg.Repositories[cnt]
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}
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numFilled = len(ctlg.Repositories)
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link := resp.Header.Get("Link")
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if link == "" {
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returnErr = io.EOF
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}
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} else {
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return 0, HandleErrorResponse(resp)
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}
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return numFilled, returnErr
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}
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// NewRepository creates a new Repository for the given repository name and base URL.
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func NewRepository(name reference.Named, baseURL string, transport http.RoundTripper) (distribution.Repository, error) {
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ub, err := v2.NewURLBuilderFromString(baseURL, false)
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if err != nil {
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return nil, err
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}
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client := &http.Client{
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Transport: transport,
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CheckRedirect: checkHTTPRedirect,
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// TODO(dmcgowan): create cookie jar
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}
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return &repository{
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client: client,
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ub: ub,
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name: name,
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}, nil
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}
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type repository struct {
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client *http.Client
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ub *v2.URLBuilder
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context context.Context
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name reference.Named
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}
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func (r *repository) Named() reference.Named {
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return r.name
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}
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func (r *repository) Blobs(ctx context.Context) distribution.BlobStore {
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statter := &blobStatter{
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name: r.name,
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ub: r.ub,
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client: r.client,
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}
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return &blobs{
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name: r.name,
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ub: r.ub,
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client: r.client,
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statter: cache.NewCachedBlobStatter(memory.NewInMemoryBlobDescriptorCacheProvider(), statter),
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}
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}
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func (r *repository) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {
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// todo(richardscothern): options should be sent over the wire
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return &manifests{
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name: r.name,
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ub: r.ub,
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client: r.client,
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etags: make(map[string]string),
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}, nil
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}
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func (r *repository) Tags(ctx context.Context) distribution.TagService {
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return &tags{
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client: r.client,
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ub: r.ub,
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name: r.Named(),
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}
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}
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// tags implements remote tagging operations.
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type tags struct {
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client *http.Client
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ub *v2.URLBuilder
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name reference.Named
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}
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// All returns all tags
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func (t *tags) All(ctx context.Context) ([]string, error) {
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var tags []string
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listURLStr, err := t.ub.BuildTagsURL(t.name)
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if err != nil {
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return tags, err
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}
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listURL, err := url.Parse(listURLStr)
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if err != nil {
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return tags, err
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}
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for {
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resp, err := t.client.Get(listURL.String())
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if err != nil {
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return tags, err
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}
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defer resp.Body.Close()
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if SuccessStatus(resp.StatusCode) {
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return tags, err
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}
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tagsResponse := struct {
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Tags []string `json:"tags"`
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}{}
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if err := json.Unmarshal(b, &tagsResponse); err != nil {
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return tags, err
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}
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tags = append(tags, tagsResponse.Tags...)
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if link := resp.Header.Get("Link"); link != "" {
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linkURLStr := strings.Trim(strings.Split(link, ";")[0], "<>")
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linkURL, err := url.Parse(linkURLStr)
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if err != nil {
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return tags, err
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}
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listURL = listURL.ResolveReference(linkURL)
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} else {
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return tags, nil
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}
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} else {
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return tags, HandleErrorResponse(resp)
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}
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}
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}
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func descriptorFromResponse(response *http.Response) (distribution.Descriptor, error) {
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desc := distribution.Descriptor{}
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headers := response.Header
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ctHeader := headers.Get("Content-Type")
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if ctHeader == "" {
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return distribution.Descriptor{}, errors.New("missing or empty Content-Type header")
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}
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desc.MediaType = ctHeader
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digestHeader := headers.Get("Docker-Content-Digest")
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if digestHeader == "" {
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bytes, err := ioutil.ReadAll(response.Body)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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_, desc, err := distribution.UnmarshalManifest(ctHeader, bytes)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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return desc, nil
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}
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dgst, err := digest.Parse(digestHeader)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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desc.Digest = dgst
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lengthHeader := headers.Get("Content-Length")
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if lengthHeader == "" {
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return distribution.Descriptor{}, errors.New("missing or empty Content-Length header")
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}
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length, err := strconv.ParseInt(lengthHeader, 10, 64)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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desc.Size = length
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return desc, nil
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}
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// Get issues a HEAD request for a Manifest against its named endpoint in order
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// to construct a descriptor for the tag. If the registry doesn't support HEADing
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// a manifest, fallback to GET.
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func (t *tags) Get(ctx context.Context, tag string) (distribution.Descriptor, error) {
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ref, err := reference.WithTag(t.name, tag)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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u, err := t.ub.BuildManifestURL(ref)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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newRequest := func(method string) (*http.Response, error) {
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req, err := http.NewRequest(method, u, nil)
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if err != nil {
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return nil, err
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}
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for _, t := range distribution.ManifestMediaTypes() {
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req.Header.Add("Accept", t)
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}
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resp, err := t.client.Do(req)
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return resp, err
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}
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resp, err := newRequest("HEAD")
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if err != nil {
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return distribution.Descriptor{}, err
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}
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defer resp.Body.Close()
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switch {
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case resp.StatusCode >= 200 && resp.StatusCode < 400 && len(resp.Header.Get("Docker-Content-Digest")) > 0:
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// if the response is a success AND a Docker-Content-Digest can be retrieved from the headers
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return descriptorFromResponse(resp)
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default:
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// if the response is an error - there will be no body to decode.
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// Issue a GET request:
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// - for data from a server that does not handle HEAD
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// - to get error details in case of a failure
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resp, err = newRequest("GET")
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if err != nil {
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return distribution.Descriptor{}, err
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 200 && resp.StatusCode < 400 {
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return descriptorFromResponse(resp)
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}
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return distribution.Descriptor{}, HandleErrorResponse(resp)
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}
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}
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func (t *tags) Lookup(ctx context.Context, digest distribution.Descriptor) ([]string, error) {
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panic("not implemented")
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}
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func (t *tags) Tag(ctx context.Context, tag string, desc distribution.Descriptor) error {
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panic("not implemented")
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}
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func (t *tags) Untag(ctx context.Context, tag string) error {
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panic("not implemented")
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}
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type manifests struct {
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name reference.Named
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ub *v2.URLBuilder
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client *http.Client
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etags map[string]string
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}
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func (ms *manifests) Exists(ctx context.Context, dgst digest.Digest) (bool, error) {
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ref, err := reference.WithDigest(ms.name, dgst)
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if err != nil {
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return false, err
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}
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u, err := ms.ub.BuildManifestURL(ref)
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if err != nil {
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return false, err
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}
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resp, err := ms.client.Head(u)
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if err != nil {
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return false, err
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}
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if SuccessStatus(resp.StatusCode) {
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return true, nil
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} else if resp.StatusCode == http.StatusNotFound {
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return false, nil
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}
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return false, HandleErrorResponse(resp)
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}
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// AddEtagToTag allows a client to supply an eTag to Get which will be
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// used for a conditional HTTP request. If the eTag matches, a nil manifest
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// and ErrManifestNotModified error will be returned. etag is automatically
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// quoted when added to this map.
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func AddEtagToTag(tag, etag string) distribution.ManifestServiceOption {
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return etagOption{tag, etag}
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}
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type etagOption struct{ tag, etag string }
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func (o etagOption) Apply(ms distribution.ManifestService) error {
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if ms, ok := ms.(*manifests); ok {
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ms.etags[o.tag] = fmt.Sprintf(`"%s"`, o.etag)
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return nil
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}
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return fmt.Errorf("etag options is a client-only option")
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}
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// ReturnContentDigest allows a client to set a the content digest on
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// a successful request from the 'Docker-Content-Digest' header. This
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// returned digest is represents the digest which the registry uses
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// to refer to the content and can be used to delete the content.
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func ReturnContentDigest(dgst *digest.Digest) distribution.ManifestServiceOption {
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return contentDigestOption{dgst}
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}
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type contentDigestOption struct{ digest *digest.Digest }
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func (o contentDigestOption) Apply(ms distribution.ManifestService) error {
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return nil
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}
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func (ms *manifests) Get(ctx context.Context, dgst digest.Digest, options ...distribution.ManifestServiceOption) (distribution.Manifest, error) {
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var (
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digestOrTag string
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ref reference.Named
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err error
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contentDgst *digest.Digest
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mediaTypes []string
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)
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for _, option := range options {
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switch opt := option.(type) {
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case distribution.WithTagOption:
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digestOrTag = opt.Tag
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ref, err = reference.WithTag(ms.name, opt.Tag)
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if err != nil {
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return nil, err
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}
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case contentDigestOption:
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contentDgst = opt.digest
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case distribution.WithManifestMediaTypesOption:
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mediaTypes = opt.MediaTypes
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default:
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err := option.Apply(ms)
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if err != nil {
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return nil, err
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}
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}
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}
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if digestOrTag == "" {
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digestOrTag = dgst.String()
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ref, err = reference.WithDigest(ms.name, dgst)
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if err != nil {
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return nil, err
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}
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}
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if len(mediaTypes) == 0 {
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mediaTypes = distribution.ManifestMediaTypes()
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}
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u, err := ms.ub.BuildManifestURL(ref)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("GET", u, nil)
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if err != nil {
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return nil, err
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}
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for _, t := range mediaTypes {
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req.Header.Add("Accept", t)
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}
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if _, ok := ms.etags[digestOrTag]; ok {
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req.Header.Set("If-None-Match", ms.etags[digestOrTag])
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}
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resp, err := ms.client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusNotModified {
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return nil, distribution.ErrManifestNotModified
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} else if SuccessStatus(resp.StatusCode) {
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if contentDgst != nil {
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dgst, err := digest.Parse(resp.Header.Get("Docker-Content-Digest"))
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if err == nil {
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*contentDgst = dgst
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}
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}
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mt := resp.Header.Get("Content-Type")
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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m, _, err := distribution.UnmarshalManifest(mt, body)
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if 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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return nil, HandleErrorResponse(resp)
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}
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|
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// Put puts a manifest. A tag can be specified using an options parameter which uses some shared state to hold the
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// tag name in order to build the correct upload URL.
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func (ms *manifests) Put(ctx context.Context, m distribution.Manifest, options ...distribution.ManifestServiceOption) (digest.Digest, error) {
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ref := ms.name
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var tagged bool
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for _, option := range options {
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if opt, ok := option.(distribution.WithTagOption); ok {
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var err error
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ref, err = reference.WithTag(ref, opt.Tag)
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if err != nil {
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return "", err
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}
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tagged = true
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} else {
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err := option.Apply(ms)
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if err != nil {
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return "", err
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}
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}
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}
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mediaType, p, err := m.Payload()
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if err != nil {
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return "", err
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}
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if !tagged {
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// generate a canonical digest and Put by digest
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_, d, err := distribution.UnmarshalManifest(mediaType, p)
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if err != nil {
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return "", err
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}
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ref, err = reference.WithDigest(ref, d.Digest)
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if err != nil {
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return "", err
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}
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}
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manifestURL, err := ms.ub.BuildManifestURL(ref)
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if err != nil {
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return "", err
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}
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putRequest, err := http.NewRequest("PUT", manifestURL, bytes.NewReader(p))
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if err != nil {
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return "", err
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}
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putRequest.Header.Set("Content-Type", mediaType)
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resp, err := ms.client.Do(putRequest)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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if SuccessStatus(resp.StatusCode) {
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dgstHeader := resp.Header.Get("Docker-Content-Digest")
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dgst, err := digest.Parse(dgstHeader)
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if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return dgst, nil
|
|
}
|
|
|
|
return "", HandleErrorResponse(resp)
|
|
}
|
|
|
|
func (ms *manifests) Delete(ctx context.Context, dgst digest.Digest) error {
|
|
ref, err := reference.WithDigest(ms.name, dgst)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
u, err := ms.ub.BuildManifestURL(ref)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req, err := http.NewRequest("DELETE", u, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
resp, err := ms.client.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if SuccessStatus(resp.StatusCode) {
|
|
return nil
|
|
}
|
|
return HandleErrorResponse(resp)
|
|
}
|
|
|
|
// todo(richardscothern): Restore interface and implementation with merge of #1050
|
|
/*func (ms *manifests) Enumerate(ctx context.Context, manifests []distribution.Manifest, last distribution.Manifest) (n int, err error) {
|
|
panic("not supported")
|
|
}*/
|
|
|
|
type blobs struct {
|
|
name reference.Named
|
|
ub *v2.URLBuilder
|
|
client *http.Client
|
|
|
|
statter distribution.BlobDescriptorService
|
|
distribution.BlobDeleter
|
|
}
|
|
|
|
func sanitizeLocation(location, base string) (string, error) {
|
|
baseURL, err := url.Parse(base)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
locationURL, err := url.Parse(location)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return baseURL.ResolveReference(locationURL).String(), nil
|
|
}
|
|
|
|
func (bs *blobs) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
|
|
return bs.statter.Stat(ctx, dgst)
|
|
|
|
}
|
|
|
|
func (bs *blobs) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
|
|
reader, err := bs.Open(ctx, dgst)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer reader.Close()
|
|
|
|
return ioutil.ReadAll(reader)
|
|
}
|
|
|
|
func (bs *blobs) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
|
|
ref, err := reference.WithDigest(bs.name, dgst)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
blobURL, err := bs.ub.BuildBlobURL(ref)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return transport.NewHTTPReadSeeker(bs.client, blobURL,
|
|
func(resp *http.Response) error {
|
|
if resp.StatusCode == http.StatusNotFound {
|
|
return distribution.ErrBlobUnknown
|
|
}
|
|
return HandleErrorResponse(resp)
|
|
}), nil
|
|
}
|
|
|
|
func (bs *blobs) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
|
|
panic("not implemented")
|
|
}
|
|
|
|
func (bs *blobs) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
|
|
writer, err := bs.Create(ctx)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
dgstr := digest.Canonical.Digester()
|
|
n, err := io.Copy(writer, io.TeeReader(bytes.NewReader(p), dgstr.Hash()))
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
if n < int64(len(p)) {
|
|
return distribution.Descriptor{}, fmt.Errorf("short copy: wrote %d of %d", n, len(p))
|
|
}
|
|
|
|
desc := distribution.Descriptor{
|
|
MediaType: mediaType,
|
|
Size: int64(len(p)),
|
|
Digest: dgstr.Digest(),
|
|
}
|
|
|
|
return writer.Commit(ctx, desc)
|
|
}
|
|
|
|
type optionFunc func(interface{}) error
|
|
|
|
func (f optionFunc) Apply(v interface{}) error {
|
|
return f(v)
|
|
}
|
|
|
|
// WithMountFrom returns a BlobCreateOption which designates that the blob should be
|
|
// mounted from the given canonical reference.
|
|
func WithMountFrom(ref reference.Canonical) distribution.BlobCreateOption {
|
|
return optionFunc(func(v interface{}) error {
|
|
opts, ok := v.(*distribution.CreateOptions)
|
|
if !ok {
|
|
return fmt.Errorf("unexpected options type: %T", v)
|
|
}
|
|
|
|
opts.Mount.ShouldMount = true
|
|
opts.Mount.From = ref
|
|
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func (bs *blobs) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
|
|
var opts distribution.CreateOptions
|
|
|
|
for _, option := range options {
|
|
err := option.Apply(&opts)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
var values []url.Values
|
|
|
|
if opts.Mount.ShouldMount {
|
|
values = append(values, url.Values{"from": {opts.Mount.From.Name()}, "mount": {opts.Mount.From.Digest().String()}})
|
|
}
|
|
|
|
u, err := bs.ub.BuildBlobUploadURL(bs.name, values...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
resp, err := bs.client.Post(u, "", nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
switch resp.StatusCode {
|
|
case http.StatusCreated:
|
|
desc, err := bs.statter.Stat(ctx, opts.Mount.From.Digest())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return nil, distribution.ErrBlobMounted{From: opts.Mount.From, Descriptor: desc}
|
|
case http.StatusAccepted:
|
|
// TODO(dmcgowan): Check for invalid UUID
|
|
uuid := resp.Header.Get("Docker-Upload-UUID")
|
|
location, err := sanitizeLocation(resp.Header.Get("Location"), u)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &httpBlobUpload{
|
|
statter: bs.statter,
|
|
client: bs.client,
|
|
uuid: uuid,
|
|
startedAt: time.Now(),
|
|
location: location,
|
|
}, nil
|
|
default:
|
|
return nil, HandleErrorResponse(resp)
|
|
}
|
|
}
|
|
|
|
func (bs *blobs) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
|
|
panic("not implemented")
|
|
}
|
|
|
|
func (bs *blobs) Delete(ctx context.Context, dgst digest.Digest) error {
|
|
return bs.statter.Clear(ctx, dgst)
|
|
}
|
|
|
|
type blobStatter struct {
|
|
name reference.Named
|
|
ub *v2.URLBuilder
|
|
client *http.Client
|
|
}
|
|
|
|
func (bs *blobStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
|
|
ref, err := reference.WithDigest(bs.name, dgst)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
u, err := bs.ub.BuildBlobURL(ref)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
resp, err := bs.client.Head(u)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if SuccessStatus(resp.StatusCode) {
|
|
lengthHeader := resp.Header.Get("Content-Length")
|
|
if lengthHeader == "" {
|
|
return distribution.Descriptor{}, fmt.Errorf("missing content-length header for request: %s", u)
|
|
}
|
|
|
|
length, err := strconv.ParseInt(lengthHeader, 10, 64)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, fmt.Errorf("error parsing content-length: %v", err)
|
|
}
|
|
|
|
return distribution.Descriptor{
|
|
MediaType: resp.Header.Get("Content-Type"),
|
|
Size: length,
|
|
Digest: dgst,
|
|
}, nil
|
|
} else if resp.StatusCode == http.StatusNotFound {
|
|
return distribution.Descriptor{}, distribution.ErrBlobUnknown
|
|
}
|
|
return distribution.Descriptor{}, HandleErrorResponse(resp)
|
|
}
|
|
|
|
func buildCatalogValues(maxEntries int, last string) url.Values {
|
|
values := url.Values{}
|
|
|
|
if maxEntries > 0 {
|
|
values.Add("n", strconv.Itoa(maxEntries))
|
|
}
|
|
|
|
if last != "" {
|
|
values.Add("last", last)
|
|
}
|
|
|
|
return values
|
|
}
|
|
|
|
func (bs *blobStatter) Clear(ctx context.Context, dgst digest.Digest) error {
|
|
ref, err := reference.WithDigest(bs.name, dgst)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
blobURL, err := bs.ub.BuildBlobURL(ref)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
req, err := http.NewRequest("DELETE", blobURL, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
resp, err := bs.client.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if SuccessStatus(resp.StatusCode) {
|
|
return nil
|
|
}
|
|
return HandleErrorResponse(resp)
|
|
}
|
|
|
|
func (bs *blobStatter) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
|
|
return nil
|
|
}
|