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package handlers
import (
"net/http"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/registry/api/errcode"
v2 "github.com/docker/distribution/registry/api/v2"
"github.com/gorilla/handlers"
"github.com/opencontainers/go-digest"
)
// blobDispatcher uses the request context to build a blobHandler.
func blobDispatcher(ctx *Context, r *http.Request) http.Handler {
dgst, err := getDigest(ctx)
if err != nil {
if err == errDigestNotAvailable {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx.Errors = append(ctx.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
})
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx.Errors = append(ctx.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
})
}
blobHandler := &blobHandler{
Context: ctx,
Digest: dgst,
}
mhandler := handlers.MethodHandler{
"GET": http.HandlerFunc(blobHandler.GetBlob),
"HEAD": http.HandlerFunc(blobHandler.GetBlob),
}
if !ctx.readOnly {
mhandler["DELETE"] = http.HandlerFunc(blobHandler.DeleteBlob)
}
return mhandler
}
// blobHandler serves http blob requests.
type blobHandler struct {
*Context
Digest digest.Digest
}
// GetBlob fetches the binary data from backend storage returns it in the
// response.
func (bh *blobHandler) GetBlob(w http.ResponseWriter, r *http.Request) {
context.GetLogger(bh).Debug("GetBlob")
blobs := bh.Repository.Blobs(bh)
desc, err := blobs.Stat(bh, bh.Digest)
if err != nil {
if err == distribution.ErrBlobUnknown {
bh.Errors = append(bh.Errors, v2.ErrorCodeBlobUnknown.WithDetail(bh.Digest))
} else {
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
return
}
if err := blobs.ServeBlob(bh, w, r, desc.Digest); err != nil {
context.GetLogger(bh).Debugf("unexpected error getting blob HTTP handler: %v", err)
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
}
// DeleteBlob deletes a layer blob
func (bh *blobHandler) DeleteBlob(w http.ResponseWriter, r *http.Request) {
context.GetLogger(bh).Debug("DeleteBlob")
blobs := bh.Repository.Blobs(bh)
err := blobs.Delete(bh, bh.Digest)
if err != nil {
switch err {
case distribution.ErrUnsupported:
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnsupported)
return
case distribution.ErrBlobUnknown:
bh.Errors = append(bh.Errors, v2.ErrorCodeBlobUnknown)
return
default:
bh.Errors = append(bh.Errors, err)
context.GetLogger(bh).Errorf("Unknown error deleting blob: %s", err.Error())
return
}
}
w.Header().Set("Content-Length", "0")
w.WriteHeader(http.StatusAccepted)
}
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