package client import ( "bytes" "encoding/json" "fmt" "io" "io/ioutil" "net/http" "net/url" "strconv" "time" "github.com/docker/distribution" "github.com/docker/distribution/context" "github.com/docker/distribution/digest" "github.com/docker/distribution/manifest" "github.com/docker/distribution/registry/api/v2" "github.com/docker/distribution/registry/client/transport" "github.com/docker/distribution/registry/storage/cache" "github.com/docker/distribution/registry/storage/cache/memory" ) // Registry provides an interface for calling Repositories, which returns a catalog of repositories. type Registry interface { Repositories(ctx context.Context, repos []string, last string) (n int, err error) } // NewRegistry creates a registry namespace which can be used to get a listing of repositories func NewRegistry(ctx context.Context, baseURL string, transport http.RoundTripper) (Registry, error) { ub, err := v2.NewURLBuilderFromString(baseURL) if err != nil { return nil, err } client := &http.Client{ Transport: transport, Timeout: 1 * time.Minute, } return ®istry{ client: client, ub: ub, context: ctx, }, nil } type registry struct { client *http.Client ub *v2.URLBuilder context context.Context } // Repositories returns a lexigraphically sorted catalog given a base URL. The 'entries' slice will be filled up to the size // of the slice, starting at the value provided in 'last'. The number of entries will be returned along with io.EOF if there // are no more entries func (r *registry) Repositories(ctx context.Context, entries []string, last string) (int, error) { var numFilled int var returnErr error values := buildCatalogValues(len(entries), last) u, err := r.ub.BuildCatalogURL(values) if err != nil { return 0, err } resp, err := r.client.Get(u) if err != nil { return 0, err } defer resp.Body.Close() switch resp.StatusCode { case http.StatusOK: var ctlg struct { Repositories []string `json:"repositories"` } decoder := json.NewDecoder(resp.Body) if err := decoder.Decode(&ctlg); err != nil { return 0, err } for cnt := range ctlg.Repositories { entries[cnt] = ctlg.Repositories[cnt] } numFilled = len(ctlg.Repositories) link := resp.Header.Get("Link") if link == "" { returnErr = io.EOF } default: return 0, handleErrorResponse(resp) } return numFilled, returnErr } // NewRepository creates a new Repository for the given repository name and base URL func NewRepository(ctx context.Context, name, baseURL string, transport http.RoundTripper) (distribution.Repository, error) { if err := v2.ValidateRepositoryName(name); err != nil { return nil, err } ub, err := v2.NewURLBuilderFromString(baseURL) if err != nil { return nil, err } client := &http.Client{ Transport: transport, // TODO(dmcgowan): create cookie jar } return &repository{ client: client, ub: ub, name: name, context: ctx, }, nil } type repository struct { client *http.Client ub *v2.URLBuilder context context.Context name string } func (r *repository) Name() string { return r.name } func (r *repository) Blobs(ctx context.Context) distribution.BlobStore { statter := &blobStatter{ name: r.Name(), ub: r.ub, client: r.client, } return &blobs{ name: r.Name(), ub: r.ub, client: r.client, statter: cache.NewCachedBlobStatter(memory.NewInMemoryBlobDescriptorCacheProvider(), statter), } } func (r *repository) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) { // todo(richardscothern): options should be sent over the wire return &manifests{ name: r.Name(), ub: r.ub, client: r.client, etags: make(map[string]string), }, nil } func (r *repository) Signatures() distribution.SignatureService { ms, _ := r.Manifests(r.context) return &signatures{ manifests: ms, } } type signatures struct { manifests distribution.ManifestService } func (s *signatures) Get(dgst digest.Digest) ([][]byte, error) { m, err := s.manifests.Get(dgst) if err != nil { return nil, err } return m.Signatures() } func (s *signatures) Put(dgst digest.Digest, signatures ...[]byte) error { panic("not implemented") } type manifests struct { name string ub *v2.URLBuilder client *http.Client etags map[string]string } func (ms *manifests) Tags() ([]string, error) { u, err := ms.ub.BuildTagsURL(ms.name) if err != nil { return nil, err } resp, err := ms.client.Get(u) if err != nil { return nil, err } defer resp.Body.Close() switch resp.StatusCode { case http.StatusOK: b, err := ioutil.ReadAll(resp.Body) if err != nil { return nil, err } tagsResponse := struct { Tags []string `json:"tags"` }{} if err := json.Unmarshal(b, &tagsResponse); err != nil { return nil, err } return tagsResponse.Tags, nil case http.StatusNotFound: return nil, nil default: return nil, handleErrorResponse(resp) } } func (ms *manifests) Exists(dgst digest.Digest) (bool, error) { // Call by Tag endpoint since the API uses the same // URL endpoint for tags and digests. return ms.ExistsByTag(dgst.String()) } func (ms *manifests) ExistsByTag(tag string) (bool, error) { u, err := ms.ub.BuildManifestURL(ms.name, tag) if err != nil { return false, err } resp, err := ms.client.Head(u) if err != nil { return false, err } switch resp.StatusCode { case http.StatusOK: return true, nil case http.StatusNotFound: return false, nil default: return false, handleErrorResponse(resp) } } func (ms *manifests) Get(dgst digest.Digest) (*manifest.SignedManifest, error) { // Call by Tag endpoint since the API uses the same // URL endpoint for tags and digests. return ms.GetByTag(dgst.String()) } // AddEtagToTag allows a client to supply an eTag to GetByTag which will // be used for a conditional HTTP request. If the eTag matches, a nil // manifest and nil error will be returned. func AddEtagToTag(tagName, dgst string) distribution.ManifestServiceOption { return func(ms distribution.ManifestService) error { if ms, ok := ms.(*manifests); ok { ms.etags[tagName] = dgst return nil } return fmt.Errorf("etag options is a client-only option") } } func (ms *manifests) GetByTag(tag string, options ...distribution.ManifestServiceOption) (*manifest.SignedManifest, error) { for _, option := range options { err := option(ms) if err != nil { return nil, err } } u, err := ms.ub.BuildManifestURL(ms.name, tag) if err != nil { return nil, err } req, err := http.NewRequest("GET", u, nil) if err != nil { return nil, err } if _, ok := ms.etags[tag]; ok { req.Header.Set("eTag", ms.etags[tag]) } resp, err := ms.client.Do(req) if err != nil { return nil, err } defer resp.Body.Close() switch resp.StatusCode { case http.StatusOK: var sm manifest.SignedManifest decoder := json.NewDecoder(resp.Body) if err := decoder.Decode(&sm); err != nil { return nil, err } return &sm, nil case http.StatusNotModified: return nil, nil default: return nil, handleErrorResponse(resp) } } func (ms *manifests) Put(m *manifest.SignedManifest) error { manifestURL, err := ms.ub.BuildManifestURL(ms.name, m.Tag) if err != nil { return err } // todo(richardscothern): do something with options here when they become applicable putRequest, err := http.NewRequest("PUT", manifestURL, bytes.NewReader(m.Raw)) if err != nil { return err } resp, err := ms.client.Do(putRequest) if err != nil { return err } defer resp.Body.Close() switch resp.StatusCode { case http.StatusAccepted: // TODO(dmcgowan): make use of digest header return nil default: return handleErrorResponse(resp) } } func (ms *manifests) Delete(dgst digest.Digest) error { u, err := ms.ub.BuildManifestURL(ms.name, dgst.String()) 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() switch resp.StatusCode { case http.StatusOK: return nil default: return handleErrorResponse(resp) } } type blobs struct { name string ub *v2.URLBuilder client *http.Client statter distribution.BlobStatter } func sanitizeLocation(location, source string) (string, error) { locationURL, err := url.Parse(location) if err != nil { return "", err } if locationURL.Scheme == "" { sourceURL, err := url.Parse(source) if err != nil { return "", err } locationURL = &url.URL{ Scheme: sourceURL.Scheme, Host: sourceURL.Host, Path: location, } location = locationURL.String() } return location, 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) { desc, err := bs.Stat(ctx, dgst) if err != nil { return nil, err } reader, err := bs.Open(ctx, desc.Digest) 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) { stat, err := bs.statter.Stat(ctx, dgst) if err != nil { return nil, err } blobURL, err := bs.ub.BuildBlobURL(bs.name, stat.Digest) if err != nil { return nil, err } return transport.NewHTTPReadSeeker(bs.client, blobURL, stat.Size), 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.New() 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) } func (bs *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) { u, err := bs.ub.BuildBlobUploadURL(bs.name) resp, err := bs.client.Post(u, "", nil) if err != nil { return nil, err } defer resp.Body.Close() switch resp.StatusCode { 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") } type blobStatter struct { name string ub *v2.URLBuilder client *http.Client } func (bs *blobStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) { u, err := bs.ub.BuildBlobURL(bs.name, dgst) if err != nil { return distribution.Descriptor{}, err } resp, err := bs.client.Head(u) if err != nil { return distribution.Descriptor{}, err } defer resp.Body.Close() switch resp.StatusCode { case http.StatusOK: lengthHeader := resp.Header.Get("Content-Length") 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 case http.StatusNotFound: return distribution.Descriptor{}, distribution.ErrBlobUnknown default: 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 }