distribution/docs/images.go

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package registry
import (
"encoding/json"
"fmt"
"net/http"
"github.com/docker/distribution/api/v2"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/storage"
"github.com/gorilla/handlers"
)
// imageManifestDispatcher takes the request context and builds the
// appropriate handler for handling image manifest requests.
func imageManifestDispatcher(ctx *Context, r *http.Request) http.Handler {
imageManifestHandler := &imageManifestHandler{
Context: ctx,
Tag: ctx.vars["tag"],
}
imageManifestHandler.log = imageManifestHandler.log.WithField("tag", imageManifestHandler.Tag)
return handlers.MethodHandler{
"GET": http.HandlerFunc(imageManifestHandler.GetImageManifest),
"PUT": http.HandlerFunc(imageManifestHandler.PutImageManifest),
"DELETE": http.HandlerFunc(imageManifestHandler.DeleteImageManifest),
}
}
// imageManifestHandler handles http operations on image manifests.
type imageManifestHandler struct {
*Context
Tag string
}
// GetImageManifest fetches the image manifest from the storage backend, if it exists.
func (imh *imageManifestHandler) GetImageManifest(w http.ResponseWriter, r *http.Request) {
manifests := imh.Repository.Manifests()
manifest, err := manifests.Get(imh.Tag)
if err != nil {
imh.Errors.Push(v2.ErrorCodeManifestUnknown, err)
w.WriteHeader(http.StatusNotFound)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Header().Set("Content-Length", fmt.Sprint(len(manifest.Raw)))
w.Write(manifest.Raw)
}
// PutImageManifest validates and stores and image in the registry.
func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http.Request) {
manifests := imh.Repository.Manifests()
dec := json.NewDecoder(r.Body)
var manifest manifest.SignedManifest
if err := dec.Decode(&manifest); err != nil {
imh.Errors.Push(v2.ErrorCodeManifestInvalid, err)
w.WriteHeader(http.StatusBadRequest)
return
}
if err := manifests.Put(imh.Tag, &manifest); err != nil {
// TODO(stevvooe): These error handling switches really need to be
// handled by an app global mapper.
switch err := err.(type) {
case storage.ErrManifestVerification:
for _, verificationError := range err {
switch verificationError := verificationError.(type) {
case storage.ErrUnknownLayer:
imh.Errors.Push(v2.ErrorCodeBlobUnknown, verificationError.FSLayer)
case storage.ErrManifestUnverified:
imh.Errors.Push(v2.ErrorCodeManifestUnverified)
default:
if verificationError == digest.ErrDigestInvalidFormat {
// TODO(stevvooe): We need to really need to move all
// errors to types. Its much more straightforward.
imh.Errors.Push(v2.ErrorCodeDigestInvalid)
} else {
imh.Errors.PushErr(verificationError)
}
}
}
default:
imh.Errors.PushErr(err)
}
w.WriteHeader(http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusAccepted)
}
// DeleteImageManifest removes the image with the given tag from the registry.
func (imh *imageManifestHandler) DeleteImageManifest(w http.ResponseWriter, r *http.Request) {
manifests := imh.Repository.Manifests()
if err := manifests.Delete(imh.Tag); err != nil {
switch err := err.(type) {
case storage.ErrUnknownManifest:
imh.Errors.Push(v2.ErrorCodeManifestUnknown, err)
w.WriteHeader(http.StatusNotFound)
default:
imh.Errors.Push(v2.ErrorCodeUnknown, err)
w.WriteHeader(http.StatusBadRequest)
}
return
}
w.Header().Set("Content-Length", "0")
w.WriteHeader(http.StatusAccepted)
}