mirror of https://github.com/goharbor/harbor.git
217 lines
7.1 KiB
Go
217 lines
7.1 KiB
Go
// Copyright Project Harbor Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package registry
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import (
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"fmt"
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"net/http"
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"strings"
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"github.com/opencontainers/go-digest"
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"github.com/goharbor/harbor/src/controller/artifact"
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"github.com/goharbor/harbor/src/controller/event/metadata"
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"github.com/goharbor/harbor/src/controller/event/operator"
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"github.com/goharbor/harbor/src/controller/repository"
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"github.com/goharbor/harbor/src/lib"
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"github.com/goharbor/harbor/src/lib/config"
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"github.com/goharbor/harbor/src/lib/errors"
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lib_http "github.com/goharbor/harbor/src/lib/http"
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"github.com/goharbor/harbor/src/lib/log"
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"github.com/goharbor/harbor/src/pkg"
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"github.com/goharbor/harbor/src/pkg/notification"
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"github.com/goharbor/harbor/src/pkg/registry"
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"github.com/goharbor/harbor/src/server/router"
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)
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// https://github.com/distribution/distribution/blob/c202b9b0d7b79a67337dec8e1f1bafb1c7095315/registry/handlers/manifests.go#L280
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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 || headerVal == fmt.Sprintf(`"%s"`, etag) { // allow quoted or unquoted
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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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// make sure the artifact exist before proxying the request to the backend registry
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func getManifest(w http.ResponseWriter, req *http.Request) {
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repository := router.Param(req.Context(), ":splat")
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reference := router.Param(req.Context(), ":reference")
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art, err := artifact.Ctl.GetByReference(req.Context(), repository, reference, nil)
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if err != nil {
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lib_http.SendError(w, err)
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return
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}
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// the reference is tag, replace it with digest
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if _, err = digest.Parse(reference); err != nil {
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req = req.Clone(req.Context())
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req.URL.Path = strings.TrimSuffix(req.URL.Path, reference) + art.Digest
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req.URL.RawPath = req.URL.EscapedPath()
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}
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// if etag match, we can earlier return and no need to proxy to distribution
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// as we have stored digest in database.
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// https://github.com/distribution/distribution/blob/c202b9b0d7b79a67337dec8e1f1bafb1c7095315/registry/handlers/manifests.go#L135
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if etagMatch(req, art.Digest) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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buffer := lib.NewResponseBuffer(w)
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// whether get manifest from cache
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fromCache := false
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// whether need to write-back cache
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wbCache := false
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// check cache
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if config.CacheEnabled() {
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manifest, err := pkg.ManifestMgr.Get(req.Context(), art.Digest)
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if err == nil {
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fromCache = true
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// write header
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buffer.Header().Set("Content-Length", fmt.Sprintf("%d", len(manifest)))
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buffer.Header().Set("Content-Type", art.ManifestMediaType)
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buffer.Header().Set("Docker-Distribution-Api-Version", "registry/2.0")
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buffer.Header().Set("Docker-Content-Digest", art.Digest)
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buffer.Header().Set("Etag", fmt.Sprintf(`"%s"`, art.Digest))
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buffer.WriteHeader(http.StatusOK)
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// write data from cache, no need to write body if is head request
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if req.Method == http.MethodGet {
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_, _ = buffer.Write(manifest)
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}
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} else {
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log.Debugf("failed to get manifest from cache, will fallback to registry, error: %v", err)
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// only write cache when request is GET because HEAD request resp
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// body is empty.
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if req.Method == http.MethodGet {
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wbCache = true
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}
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}
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}
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// proxy to registry if not from cache
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if !fromCache {
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proxy.ServeHTTP(buffer, req)
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}
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// flush data
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if _, err = buffer.Flush(); err != nil {
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log.Errorf("failed to flush: %v", err)
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return
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}
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// return if not success
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if !buffer.Success() {
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return
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}
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// write back manifest to cache if needed
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if wbCache {
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if err = pkg.ManifestMgr.Save(req.Context(), art.Digest, buffer.Buffer()); err != nil {
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log.Warningf("failed to save manifest %s to cache, error: %v", art.Digest, err)
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}
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}
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// fire event, ignore the HEAD request and pulling request from replication service
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if req.Method == http.MethodHead || req.UserAgent() == registry.UserAgent {
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return
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}
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e := &metadata.PullArtifactEventMetadata{
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Artifact: &art.Artifact,
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Operator: operator.FromContext(req.Context()),
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}
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// the reference is tag
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if _, err = digest.Parse(reference); err != nil {
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e.Tag = reference
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}
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notification.AddEvent(req.Context(), e)
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}
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// just delete the artifact from database
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func deleteManifest(w http.ResponseWriter, req *http.Request) {
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repository := router.Param(req.Context(), ":splat")
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reference := router.Param(req.Context(), ":reference")
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// v2 doesn't support delete by tag
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// add parse digest here is to return ErrDigestInvalidFormat before GetByReference throws an NOT_FOUND(404)
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// Do not add the logic into GetByReference as it's a shared method for PUT/GET/DELETE/Internal call,
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// and NOT_FOUND satisfy PUT/GET/Internal call.
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if _, err := digest.Parse(reference); err != nil {
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lib_http.SendError(w, errors.Wrapf(err, "unsupported digest %s", reference).WithCode(errors.UNSUPPORTED))
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return
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}
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art, err := artifact.Ctl.GetByReference(req.Context(), repository, reference, nil)
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if err != nil {
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lib_http.SendError(w, err)
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return
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}
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if err = artifact.Ctl.Delete(req.Context(), art.ID); err != nil {
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lib_http.SendError(w, err)
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return
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}
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w.WriteHeader(http.StatusAccepted)
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// clean cache if enabled
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if config.CacheEnabled() {
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if err = pkg.ManifestMgr.Delete(req.Context(), art.Digest); err != nil {
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log.Errorf("failed to delete manifest cache: %v", err)
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}
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}
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}
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func putManifest(w http.ResponseWriter, req *http.Request) {
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repo := router.Param(req.Context(), ":splat")
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reference := router.Param(req.Context(), ":reference")
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// make sure the repository exist before pushing the manifest
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_, _, err := repository.Ctl.Ensure(req.Context(), repo)
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if err != nil {
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lib_http.SendError(w, err)
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return
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}
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buffer := lib.NewResponseBuffer(w)
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// proxy the req to the backend docker registry
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proxy.ServeHTTP(buffer, req)
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if !buffer.Success() {
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if _, err := buffer.Flush(); err != nil {
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log.Errorf("failed to flush: %v", err)
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}
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return
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}
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// When got the response from the backend docker registry, the manifest and
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// tag are both ready, so we don't need to handle the issue anymore:
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// https://github.com/distribution/distribution/v3/issues/2625
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var tags []string
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dgt := reference
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// the reference is tag, get the digest from the response header
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if _, err = digest.Parse(reference); err != nil {
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dgt = buffer.Header().Get("Docker-Content-Digest")
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tags = append(tags, reference)
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}
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_, _, err = artifact.Ctl.Ensure(req.Context(), repo, dgt, &artifact.ArtOption{
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Tags: tags,
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})
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if err != nil {
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lib_http.SendError(w, err)
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return
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}
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// flush the origin response from the docker registry to the underlying response writer
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if _, err := buffer.Flush(); err != nil {
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log.Errorf("failed to flush: %v", err)
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}
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}
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