package handlers import ( "net/http" "github.com/docker/distribution" "github.com/docker/distribution/context" "github.com/docker/distribution/digest" "github.com/docker/distribution/registry/api/errcode" "github.com/docker/distribution/registry/api/v2" "github.com/gorilla/handlers" ) // 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, errcode.NewError(v2.ErrorCodeDigestInvalid, err)) }) } return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctx.Errors = append(ctx.Errors, errcode.NewError(v2.ErrorCodeDigestInvalid, err)) }) } blobHandler := &blobHandler{ Context: ctx, Digest: dgst, } return handlers.MethodHandler{ "GET": http.HandlerFunc(blobHandler.GetBlob), "HEAD": http.HandlerFunc(blobHandler.GetBlob), } } // 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, errcode.NewError(v2.ErrorCodeBlobUnknown, bh.Digest)) } else { bh.Errors = append(bh.Errors, errcode.NewError(errcode.ErrorCodeUnknown, 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.NewError(errcode.ErrorCodeUnknown, err)) return } }