79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
package handlers
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import (
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"net/http"
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"github.com/docker/distribution"
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ctxu "github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/registry/api/v2"
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"github.com/gorilla/handlers"
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)
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// layerDispatcher uses the request context to build a layerHandler.
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func layerDispatcher(ctx *Context, r *http.Request) http.Handler {
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dgst, err := getDigest(ctx)
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if err != nil {
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if err == errDigestNotAvailable {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusNotFound)
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ctx.Errors.Push(v2.ErrorCodeDigestInvalid, err)
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})
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx.Errors.Push(v2.ErrorCodeDigestInvalid, err)
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})
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}
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layerHandler := &layerHandler{
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Context: ctx,
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Digest: dgst,
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}
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return handlers.MethodHandler{
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"GET": http.HandlerFunc(layerHandler.GetLayer),
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"HEAD": http.HandlerFunc(layerHandler.GetLayer),
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}
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}
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// layerHandler serves http layer requests.
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type layerHandler struct {
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*Context
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Digest digest.Digest
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}
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// GetLayer fetches the binary data from backend storage returns it in the
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// response.
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func (lh *layerHandler) GetLayer(w http.ResponseWriter, r *http.Request) {
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ctxu.GetLogger(lh).Debug("GetImageLayer")
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layers := lh.Repository.Layers()
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layer, err := layers.Fetch(lh.Digest)
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if err != nil {
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switch err := err.(type) {
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case distribution.ErrUnknownLayer:
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w.WriteHeader(http.StatusNotFound)
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lh.Errors.Push(v2.ErrorCodeBlobUnknown, err.FSLayer)
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default:
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lh.Errors.Push(v2.ErrorCodeUnknown, err)
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}
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return
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}
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defer layer.Close()
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w.Header().Set("Docker-Content-Digest", lh.Digest.String())
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if lh.layerHandler != nil {
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handler, _ := lh.layerHandler.Resolve(layer)
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if handler != nil {
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handler.ServeHTTP(w, r)
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return
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}
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}
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http.ServeContent(w, r, layer.Digest().String(), layer.CreatedAt(), layer)
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}
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