package server import ( "bufio" "bytes" "fmt" "net/http" castorev1pb "code.tvl.fyi/tvix/castore/protos" "code.tvl.fyi/tvix/nar-bridge/pkg/importer" "github.com/go-chi/chi/v5" nixhash "github.com/nix-community/go-nix/pkg/hash" "github.com/nix-community/go-nix/pkg/nixbase32" "github.com/sirupsen/logrus" log "github.com/sirupsen/logrus" ) func registerNarPut(s *Server) { s.handler.Put(narUrl, func(w http.ResponseWriter, r *http.Request) { defer r.Body.Close() ctx := r.Context() // parse the narhash sent in the request URL narHashFromUrl, err := parseNarHashFromUrl(chi.URLParamFromCtx(ctx, "narhash")) if err != nil { log.WithError(err).WithField("url", r.URL).Error("unable to decode nar hash from url") w.WriteHeader(http.StatusBadRequest) _, err := w.Write([]byte("unable to decode nar hash from url")) if err != nil { log.WithError(err).Error("unable to write error message to client") } return } log := log.WithField("narhash_url", narHashFromUrl.SRIString()) directoriesUploader := NewDirectoriesUploader(ctx, s.directoryServiceClient) defer directoriesUploader.Done() //nolint:errcheck pathInfo, err := importer.Import( ctx, // buffer the body by 10MiB bufio.NewReaderSize(r.Body, 10*1024*1024), importer.GenBlobUploaderCb(ctx, s.blobServiceClient), func(directory *castorev1pb.Directory) ([]byte, error) { return directoriesUploader.Put(directory) }, ) if err != nil { log.Errorf("error during NAR import: %v", err) w.WriteHeader(http.StatusInternalServerError) _, err := w.Write([]byte(fmt.Sprintf("error during NAR import: %v", err))) if err != nil { log.WithError(err).Errorf("unable to write error message to client") } return } log.Debug("closing the stream") // Close the directories uploader directoriesPutResponse, err := directoriesUploader.Done() if err != nil { log.WithError(err).Error("error during directory upload") w.WriteHeader(http.StatusBadRequest) _, err := w.Write([]byte("error during directory upload")) if err != nil { log.WithError(err).Errorf("unable to write error message to client") } return } // If we uploaded directories (so directoriesPutResponse doesn't return null), // the RootDigest field in directoriesPutResponse should match the digest // returned in the PathInfo struct returned by the `Import` call. // This check ensures the server-side came up with the same root hash. if directoriesPutResponse != nil { rootDigestPathInfo := pathInfo.GetNode().GetDirectory().GetDigest() rootDigestDirectoriesPutResponse := directoriesPutResponse.GetRootDigest() log := log.WithFields(logrus.Fields{ "root_digest_pathinfo": rootDigestPathInfo, "root_digest_directories_put_resp": rootDigestDirectoriesPutResponse, }) if !bytes.Equal(rootDigestPathInfo, rootDigestDirectoriesPutResponse) { log.Errorf("returned root digest doesn't match what's calculated") w.WriteHeader(http.StatusBadRequest) _, err := w.Write([]byte("error in root digest calculation")) if err != nil { log.WithError(err).Error("unable to write error message to client") } return } } // Compare the nar hash specified in the URL with the one that has been // calculated while processing the NAR file piNarHash, err := nixhash.ParseNixBase32( "sha256:" + nixbase32.EncodeToString(pathInfo.GetNarinfo().NarSha256), ) if err != nil { panic("must parse nixbase32") } if !bytes.Equal(narHashFromUrl.Digest(), piNarHash.Digest()) { log := log.WithFields(logrus.Fields{ "narhash_received_sha256": piNarHash.SRIString(), "narsize": pathInfo.GetNarinfo().GetNarSize(), }) log.Error("received bytes don't match narhash from URL") w.WriteHeader(http.StatusBadRequest) _, err := w.Write([]byte("received bytes don't match narHash specified in URL")) if err != nil { log.WithError(err).Errorf("unable to write error message to client") } return } // Insert the partial pathinfo structs into our lookup map, // so requesting the NAR file will be possible. // The same might exist already, but it'll have the same contents (so // replacing will be a no-op), except maybe the root node Name field value, which // is safe to ignore (as not part of the NAR). s.narHashToPathInfoMu.Lock() s.narHashToPathInfo[piNarHash.SRIString()] = pathInfo s.narHashToPathInfoMu.Unlock() // Done! }) }