Add Etag header for manifests.
Return 304 (Not Modified) if retrieved with If-None-Match header Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
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d2ca423500
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2 changed files with 47 additions and 0 deletions
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@ -449,6 +449,7 @@ func TestManifestAPI(t *testing.T) {
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checkResponse(t, "fetching uploaded manifest", resp, http.StatusOK)
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checkHeaders(t, resp, http.Header{
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"Docker-Content-Digest": []string{dgst.String()},
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"ETag": []string{dgst.String()},
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})
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var fetchedManifest manifest.SignedManifest
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@ -470,6 +471,7 @@ func TestManifestAPI(t *testing.T) {
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checkResponse(t, "fetching uploaded manifest", resp, http.StatusOK)
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checkHeaders(t, resp, http.Header{
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"Docker-Content-Digest": []string{dgst.String()},
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"ETag": []string{dgst.String()},
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})
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var fetchedManifestByDigest manifest.SignedManifest
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@ -482,6 +484,33 @@ func TestManifestAPI(t *testing.T) {
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t.Fatalf("manifests do not match")
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}
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// Get by name with etag, gives 304
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etag := resp.Header.Get("Etag")
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req, err := http.NewRequest("GET", manifestURL, nil)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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req.Header.Set("If-None-Match", etag)
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resp, err = http.DefaultClient.Do(req)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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checkResponse(t, "fetching layer with etag", resp, http.StatusNotModified)
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// Get by digest with etag, gives 304
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req, err = http.NewRequest("GET", manifestDigestURL, nil)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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req.Header.Set("If-None-Match", etag)
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resp, err = http.DefaultClient.Do(req)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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checkResponse(t, "fetching layer with etag", resp, http.StatusNotModified)
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// Ensure that the tag is listed.
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resp, err = http.Get(tagsURL)
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if err != nil {
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@ -60,6 +60,10 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
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if imh.Tag != "" {
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sm, err = manifests.GetByTag(imh.Tag)
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} else {
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if etagMatch(r, imh.Digest.String()) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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sm, err = manifests.Get(imh.Digest)
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}
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@ -75,6 +79,10 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
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imh.Errors = append(imh.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
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return
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}
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if etagMatch(r, dgst.String()) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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imh.Digest = dgst
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}
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@ -82,9 +90,19 @@ func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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w.Header().Set("Content-Length", fmt.Sprint(len(sm.Raw)))
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w.Header().Set("Docker-Content-Digest", imh.Digest.String())
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w.Header().Set("Etag", imh.Digest.String())
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w.Write(sm.Raw)
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}
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func etagMatch(r *http.Request, etag string) bool {
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for _, headerVal := range r.Header["If-None-Match"] {
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if headerVal == etag {
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return true
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}
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}
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return false
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}
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// PutImageManifest validates and stores and image in the registry.
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func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http.Request) {
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ctxu.GetLogger(imh).Debug("PutImageManifest")
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