[#151] index page: Add browse via native protocol

Signed-off-by: Nikita Zinkevich <n.zinkevich@yadro.com>

cmd/http-gw/app.go

@@ -219,20 +219,28 @@ func (a *app) loadIndexPageTemplate() {
 	if !a.settings.IndexPageEnabled() {
 		return
 	}
-	reader, err := os.Open(a.cfg.GetString(cfgIndexPageTemplatePath))
+	path := a.cfg.GetString(cfgIndexPageTemplatePath)
-	if err != nil {
+	if path == "" {
 		a.settings.setIndexTemplate("")
-		a.log.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+		a.log.Info(logs.SetDefaultIndexPageTemplate)
 		return
 	}
-	tmpl, err := io.ReadAll(reader)
+
+	tmpl, err := a.readTemplate(path)
 	if err != nil {
-		a.settings.setIndexTemplate("")
+		a.log.Fatal(logs.FailedToReadIndexPageTemplate, zap.Error(err))
-		a.log.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+	} else {
-		return
+		a.settings.setIndexTemplate(string(tmpl))
+		a.log.Info(logs.SetCustomIndexPageTemplate, zap.String("path", path))
 	}
-	a.settings.setIndexTemplate(string(tmpl))
+}
-	a.log.Info(logs.SetCustomIndexPageTemplate)
+
+func (a *app) readTemplate(path string) ([]byte, error) {
+	reader, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	return io.ReadAll(reader)
 }
 
 func (s *appSettings) ClientCut() bool {

cmd/http-gw/settings.go

@@ -206,9 +206,6 @@ func settings() *viper.Viper {
 	// pool:
 	v.SetDefault(cfgPoolErrorThreshold, defaultPoolErrorThreshold)
 
-	v.SetDefault(cfgIndexPageEnabled, false)
-	v.SetDefault(cfgIndexPageTemplatePath, "")
-
 	// frostfs:
 	v.SetDefault(cfgBufferMaxSizeForPut, defaultBufferMaxSizeForPut)
 

docs/gate-configuration.md

@@ -351,7 +351,12 @@ resolve_bucket:
 
 # `index_page` section
 
-Parameters for index HTML-page output with S3-bucket or S3-subdir content for `Get object` request
+Parameters for index HTML-page output. Activates if `GetObject` request returns `not found`. Two
+index page modes available:
+
+* `s3` mode uses tree service for listing objects,
+* `native` sends requests to nodes via native protocol.
+  If request pass S3-bucket name instead of CID, `s3` mode will be used, otherwise `native`.
 
 ```yaml
 index_page:

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/docker/go-units v0.4.0
 	github.com/fasthttp/router v1.4.1
 	github.com/nspcc-dev/neo-go v0.106.2
+	github.com/panjf2000/ants/v2 v2.5.0
 	github.com/prometheus/client_golang v1.19.0
 	github.com/prometheus/client_model v0.5.0
 	github.com/spf13/pflag v1.0.5

go.sum

@@ -680,6 +680,8 @@ github.com/opencontainers/selinux v1.6.0/go.mod h1:VVGKuOLlE7v4PJyT6h7mNWvq1rzqi
 github.com/opencontainers/selinux v1.8.0/go.mod h1:RScLhm78qiWa2gbVCcGkC7tCGdgk3ogry1nUQF8Evvo=
 github.com/opencontainers/selinux v1.8.2/go.mod h1:MUIHuUEvKB1wtJjQdOyYRgOnLD2xAPP8dBsCoU0KuF8=
 github.com/opencontainers/selinux v1.10.0/go.mod h1:2i0OySw99QjzBBQByd1Gr9gSjvuho1lHsJxIJ3gGbJI=
+github.com/panjf2000/ants/v2 v2.5.0 h1:1rWGWSnxCsQBga+nQbA4/iY6VMeNoOIAM0ZWh9u3q2Q=
+github.com/panjf2000/ants/v2 v2.5.0/go.mod h1:cU93usDlihJZ5CfRGNDYsiBYvoilLvBF5Qp/BT2GNRE=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/pelletier/go-toml v1.8.1/go.mod h1:T2/BmBdy8dvIRq1a/8aqjN41wvWlN4lrapLU/GW4pbc=
 github.com/pelletier/go-toml/v2 v2.0.6 h1:nrzqCb7j9cDFj2coyLNLaZuJTLjWjlaz6nvTvIwycIU=

internal/handler/browse.go

@@ -1,16 +1,24 @@
 package handler
 
 import (
+	"context"
 	"html/template"
 	"net/url"
+	"runtime"
 	"sort"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/utils"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/docker/go-units"
+	"github.com/panjf2000/ants/v2"
 	"github.com/valyala/fasthttp"
 	"go.uber.org/zap"
 )
@@ -25,19 +33,65 @@ const (
 
 type (
 	BrowsePageData struct {
-		BucketName,
+		Container string
-		Prefix string
+		Prefix    string
-		Objects []ResponseObject
+		Protocol  string
+		Objects   []ResponseObject
 	}
 	ResponseObject struct {
 		OID      string
 		Created  string
 		FileName string
+		FilePath string
 		Size     string
 		IsDir    bool
 	}
 )
 
+func newListObjectsResponseS3(attrs map[string]string) ResponseObject {
+	return ResponseObject{
+		Created:  formatTimestamp(attrs[attrCreated]),
+		FileName: attrs[attrFileName],
+		Size:     attrs[attrSize],
+		IsDir:    attrs[attrOID] == "",
+	}
+}
+
+func newListObjectsResponseNative(attrs map[string]string) ResponseObject {
+	filename := lastPathElement(attrs[object.AttributeFilePath])
+	if filename == "" {
+		filename = attrs[attrFileName]
+	}
+	return ResponseObject{
+		OID:      attrs[attrOID],
+		Created:  formatTimestamp(attrs[object.AttributeTimestamp] + "000"),
+		FileName: filename,
+		FilePath: attrs[object.AttributeFilePath],
+		Size:     attrs[attrSize],
+		IsDir:    false,
+	}
+}
+
+func getNextDir(filepath, prefix string) string {
+	restPath := strings.Replace(filepath, prefix, "", 1)
+	index := strings.Index(restPath, "/")
+	if index == -1 {
+		return ""
+	}
+	return restPath[:index]
+}
+
+func lastPathElement(path string) string {
+	if path == "" {
+		return path
+	}
+	index := strings.LastIndex(path, "/")
+	if index == len(path)-1 {
+		index = strings.LastIndex(path[:index], "/")
+	}
+	return path[index+1:]
+}
+
 func parseTimestamp(tstamp string) (time.Time, error) {
 	millis, err := strconv.ParseInt(tstamp, 10, 64)
 	if err != nil {
@@ -47,16 +101,6 @@ func parseTimestamp(tstamp string) (time.Time, error) {
 	return time.UnixMilli(millis), nil
 }
 
-func NewResponseObject(nodes map[string]string) ResponseObject {
-	return ResponseObject{
-		OID:      nodes[attrOID],
-		Created:  nodes[attrCreated],
-		FileName: nodes[attrFileName],
-		Size:     nodes[attrSize],
-		IsDir:    nodes[attrOID] == "",
-	}
-}
-
 func formatTimestamp(strdate string) string {
 	date, err := parseTimestamp(strdate)
 	if err != nil || date.IsZero() {
@@ -94,12 +138,9 @@ func trimPrefix(encPrefix string) string {
 	return prefix[:slashIndex]
 }
 
-func urlencode(prefix, filename string) string {
+func urlencode(path string) string {
 	var res strings.Builder
-	path := filename
+
-	if prefix != "" {
-		path = strings.Join([]string{prefix, filename}, "/")
-	}
 	prefixParts := strings.Split(path, "/")
 	for _, prefixPart := range prefixParts {
 		prefixPart = "/" + url.PathEscape(prefixPart)
@@ -112,46 +153,219 @@ func urlencode(prefix, filename string) string {
 	return res.String()
 }
 
-func (h *Handler) browseObjects(c *fasthttp.RequestCtx, bucketInfo *data.BucketInfo, prefix string) {
+func (h *Handler) getDirObjectsS3(ctx context.Context, bucketInfo *data.BucketInfo, prefix string) ([]ResponseObject, error) {
+	nodes, _, err := h.tree.GetSubTreeByPrefix(ctx, bucketInfo, prefix, true)
+	if err != nil {
+		return nil, err
+	}
+
+	var objects = make([]ResponseObject, 0, len(nodes))
+	for _, node := range nodes {
+		meta := node.GetMeta()
+		if meta == nil {
+			continue
+		}
+		var attrs = make(map[string]string, len(meta))
+		for _, m := range meta {
+			attrs[m.GetKey()] = string(m.GetValue())
+		}
+		obj := newListObjectsResponseS3(attrs)
+		obj.FilePath = prefix + obj.FileName
+		objects = append(objects, obj)
+	}
+
+	return objects, nil
+}
+
+func (h *Handler) getDirObjectsNative(ctx context.Context, bucketInfo *data.BucketInfo, prefix string) ([]ResponseObject, error) {
+	var basePath string
+	if ind := strings.LastIndex(prefix, "/"); ind != -1 {
+		basePath = prefix[:ind+1]
+	}
+
+	filters := object.NewSearchFilters()
+	filters.AddRootFilter()
+	if prefix != "" {
+		filters.AddFilter(object.AttributeFilePath, prefix, object.MatchCommonPrefix)
+	}
+
+	prm := PrmObjectSearch{
+		PrmAuth: PrmAuth{
+			BearerToken: bearerToken(ctx),
+		},
+		Container: bucketInfo.CID,
+		Filters:   filters,
+	}
+	objectIDs, err := h.frostfs.SearchObjects(ctx, prm)
+	if err != nil {
+		return nil, err
+	}
+	defer objectIDs.Close()
+
+	return h.headDirObjects(ctx, bucketInfo.CID, objectIDs, basePath)
+}
+
+type workerParams struct {
+	cnrID     cid.ID
+	objectIDs ResObjectSearch
+	basePath  string
+	errCh     chan error
+	objCh     chan ResponseObject
+	cancel    context.CancelFunc
+}
+
+func (h *Handler) headDirObjects(ctx context.Context, cnrID cid.ID, objectIDs ResObjectSearch, basePath string) ([]ResponseObject, error) {
+	const initialSliceCapacity = 100
+
+	var wg sync.WaitGroup
+	var dirs sync.Map
+	log := h.log.With(
+		zap.String("cid", cnrID.EncodeToString()),
+		zap.String("path", basePath),
+	)
+	done := make(chan struct{})
+	objects := make([]ResponseObject, 0, initialSliceCapacity)
+	ctx, cancel := context.WithCancel(ctx)
+	p := workerParams{
+		cnrID:     cnrID,
+		objectIDs: objectIDs,
+		basePath:  basePath,
+		errCh:     make(chan error, 1),
+		objCh:     make(chan ResponseObject, 1),
+		cancel:    cancel,
+	}
+	defer cancel()
+
+	go func() {
+		for err := range p.errCh {
+			if err != nil {
+				log.Error(logs.FailedToHeadObject, zap.Error(err))
+			}
+		}
+		done <- struct{}{}
+	}()
+
+	go func() {
+		for obj := range p.objCh {
+			objects = append(objects, obj)
+		}
+		done <- struct{}{}
+	}()
+
+	pool, err := ants.NewPool(runtime.NumCPU())
+	if err != nil {
+		return nil, err
+	}
+	defer pool.Release()
+	err = objectIDs.Iterate(func(id oid.ID) bool {
+		wg.Add(1)
+		if err = pool.Submit(func() {
+			defer wg.Done()
+			h.headDirObject(ctx, id, &dirs, p)
+		}); err != nil {
+			p.errCh <- err
+		}
+		select {
+		case <-ctx.Done():
+			return true
+		default:
+			return false
+		}
+	})
+	wg.Wait()
+	close(p.errCh)
+	close(p.objCh)
+	<-done
+	<-done
+
+	if err != nil {
+		return nil, err
+	}
+
+	return objects, nil
+}
+
+func (h *Handler) headDirObject(ctx context.Context, objID oid.ID, dirs *sync.Map, p workerParams) {
+	addr := newAddress(p.cnrID, objID)
+	obj, err := h.frostfs.HeadObject(ctx, PrmObjectHead{
+		PrmAuth: PrmAuth{BearerToken: bearerToken(ctx)},
+		Address: addr,
+	})
+	if err != nil {
+		p.errCh <- err
+		p.cancel()
+		return
+	}
+
+	attrs := loadAttributes(obj.Attributes())
+	attrs[attrOID] = objID.EncodeToString()
+	attrs[attrSize] = strconv.FormatUint(obj.PayloadSize(), 10)
+
+	dirname := getNextDir(attrs[object.AttributeFilePath], p.basePath)
+	if dirname == "" {
+		p.objCh <- newListObjectsResponseNative(attrs)
+	} else if _, ok := dirs.Load(dirname); !ok {
+		p.objCh <- ResponseObject{
+			FileName: dirname,
+			FilePath: p.basePath + dirname,
+			IsDir:    true,
+		}
+		dirs.Store(dirname, true)
+	}
+}
+
+type browseParams struct {
+	bucketInfo  *data.BucketInfo
+	prefix      string
+	isNative    bool
+	listObjects func(ctx context.Context, bucketName *data.BucketInfo, prefix string) ([]ResponseObject, error)
+}
+
+func (h *Handler) browseObjects(c *fasthttp.RequestCtx, p browseParams) {
+	const S3Protocol = "s3"
+	const FrostfsProtocol = "frostfs"
+
 	ctx := utils.GetContextFromRequest(c)
 	reqLog := utils.GetReqLogOrDefault(ctx, h.log)
-	log := reqLog.With(zap.String("bucket", bucketInfo.Name))
+	log := reqLog.With(
-
+		zap.String("bucket", p.bucketInfo.Name),
-	nodes, err := h.listObjects(ctx, bucketInfo, prefix)
+		zap.String("container", p.bucketInfo.CID.EncodeToString()),
+		zap.String("prefix", p.prefix),
+	)
+	objects, err := p.listObjects(ctx, p.bucketInfo, p.prefix)
 	if err != nil {
 		logAndSendBucketError(c, log, err)
 		return
 	}
 
-	respObjects := make([]ResponseObject, len(nodes))
+	sort.Slice(objects, func(i, j int) bool {
-
+		if objects[i].IsDir == objects[j].IsDir {
-	for i, node := range nodes {
+			return objects[i].FileName < objects[j].FileName
-		respObjects[i] = NewResponseObject(node)
-	}
-
-	sort.Slice(respObjects, func(i, j int) bool {
-		if respObjects[i].IsDir == respObjects[j].IsDir {
-			return respObjects[i].FileName < respObjects[j].FileName
 		}
-		return respObjects[i].IsDir
+		return objects[i].IsDir
 	})
-	indexTemplate := h.config.IndexPageTemplate()
 
 	tmpl, err := template.New("index").Funcs(template.FuncMap{
-		"formatTimestamp": formatTimestamp,
+		"formatSize": formatSize,
-		"formatSize":      formatSize,
+		"trimPrefix": trimPrefix,
-		"trimPrefix":      trimPrefix,
+		"urlencode":  urlencode,
-		"urlencode":       urlencode,
+		"parentDir":  parentDir,
-		"parentDir":       parentDir,
+	}).Parse(h.config.IndexPageTemplate())
-	}).Parse(indexTemplate)
 	if err != nil {
 		logAndSendBucketError(c, log, err)
 		return
 	}
+	bucketName := p.bucketInfo.Name
+	protocol := S3Protocol
+	if p.isNative {
+		bucketName = p.bucketInfo.CID.EncodeToString()
+		protocol = FrostfsProtocol
+	}
 	if err = tmpl.Execute(c, &BrowsePageData{
-		BucketName: bucketInfo.Name,
+		Container: bucketName,
-		Prefix:     prefix,
+		Prefix:    p.prefix,
-		Objects:    respObjects,
+		Objects:   objects,
+		Protocol:  protocol,
 	}); err != nil {
 		logAndSendBucketError(c, log, err)
 		return

internal/handler/download.go

@@ -23,10 +23,9 @@ import (
 
 // DownloadByAddressOrBucketName handles download requests using simple cid/oid or bucketname/key format.
 func (h *Handler) DownloadByAddressOrBucketName(c *fasthttp.RequestCtx) {
-	test, _ := c.UserValue("oid").(string)
+	cnrIDStr, _ := c.UserValue("cid").(string)
-	var id oid.ID
+	var cnrID cid.ID
-	err := id.DecodeString(test)
+	if err := cnrID.DecodeString(cnrIDStr); err != nil {
-	if err != nil {
 		h.byObjectName(c, h.receiveFile)
 	} else {
 		h.byAddress(c, h.receiveFile)
@@ -45,7 +44,7 @@ func (h *Handler) DownloadByAttribute(c *fasthttp.RequestCtx) {
 	h.byAttribute(c, h.receiveFile)
 }
 
-func (h *Handler) search(ctx context.Context, cnrID *cid.ID, key, val string, op object.SearchMatchType) (ResObjectSearch, error) {
+func (h *Handler) search(ctx context.Context, cnrID cid.ID, key, val string, op object.SearchMatchType) (ResObjectSearch, error) {
 	filters := object.NewSearchFilters()
 	filters.AddRootFilter()
 	filters.AddFilter(key, val, op)
@@ -54,7 +53,7 @@ func (h *Handler) search(ctx context.Context, cnrID *cid.ID, key, val string, op
 		PrmAuth: PrmAuth{
 			BearerToken: bearerToken(ctx),
 		},
-		Container: *cnrID,
+		Container: cnrID,
 		Filters:   filters,
 	}
 
@@ -102,7 +101,7 @@ func (h *Handler) DownloadZipped(c *fasthttp.RequestCtx) {
 		return
 	}
 
-	resSearch, err := h.search(ctx, &bktInfo.CID, object.AttributeFilePath, prefix, object.MatchCommonPrefix)
+	resSearch, err := h.search(ctx, bktInfo.CID, object.AttributeFilePath, prefix, object.MatchCommonPrefix)
 	if err != nil {
 		log.Error(logs.CouldNotSearchForObjects, zap.Error(err))
 		response.Error(c, "could not search for objects: "+err.Error(), fasthttp.StatusBadRequest)

internal/handler/handler.go

@@ -191,7 +191,7 @@ func New(params *AppParams, config Config, tree *tree.Tree) *Handler {
 // prepares request and object address to it.
 func (h *Handler) byAddress(c *fasthttp.RequestCtx, f func(context.Context, request, oid.Address)) {
 	idCnr, _ := c.UserValue("cid").(string)
-	idObj, _ := c.UserValue("oid").(string)
+	idObj, _ := url.PathUnescape(c.UserValue("oid").(string))
 
 	ctx := utils.GetContextFromRequest(c)
 	reqLog := utils.GetReqLogOrDefault(ctx, h.log)
@@ -205,6 +205,16 @@ func (h *Handler) byAddress(c *fasthttp.RequestCtx, f func(context.Context, requ
 
 	objID := new(oid.ID)
 	if err = objID.DecodeString(idObj); err != nil {
+		if h.config.IndexPageEnabled() {
+			c.SetStatusCode(fasthttp.StatusNotFound)
+			h.browseObjects(c, browseParams{
+				bucketInfo:  bktInfo,
+				prefix:      idObj,
+				listObjects: h.getDirObjectsNative,
+				isNative:    true,
+			})
+			return
+		}
 		log.Error(logs.WrongObjectID, zap.Error(err))
 		response.Error(c, "wrong object id", fasthttp.StatusBadRequest)
 		return
@@ -243,7 +253,12 @@ func (h *Handler) byObjectName(c *fasthttp.RequestCtx, f func(context.Context, r
 		if isDir(unescapedKey) || isContainerRoot(unescapedKey) {
 			if code := checkErrorType(err); code == fasthttp.StatusNotFound || code == fasthttp.StatusOK {
 				c.SetStatusCode(code)
-				h.browseObjects(c, bktInfo, unescapedKey)
+				h.browseObjects(c, browseParams{
+					bucketInfo:  bktInfo,
+					prefix:      unescapedKey,
+					listObjects: h.getDirObjectsS3,
+					isNative:    false,
+				})
 				return
 			}
 		}
@@ -298,7 +313,7 @@ func (h *Handler) byAttribute(c *fasthttp.RequestCtx, f func(context.Context, re
 		return
 	}
 
-	res, err := h.search(ctx, &bktInfo.CID, key, val, object.MatchStringEqual)
+	res, err := h.search(ctx, bktInfo.CID, key, val, object.MatchStringEqual)
 	if err != nil {
 		log.Error(logs.CouldNotSearchForObjects, zap.Error(err))
 		response.Error(c, "could not search for objects: "+err.Error(), fasthttp.StatusBadRequest)
@@ -394,25 +409,3 @@ func (h *Handler) readContainer(ctx context.Context, cnrID cid.ID) (*data.Bucket
 
 	return bktInfo, err
 }
-
-func (h *Handler) listObjects(ctx context.Context, bucketInfo *data.BucketInfo, prefix string) ([]map[string]string, error) {
-	nodes, _, err := h.tree.GetSubTreeByPrefix(ctx, bucketInfo, prefix, true)
-	if err != nil {
-		return nil, err
-	}
-
-	var objects = make([]map[string]string, 0, len(nodes))
-	for _, node := range nodes {
-		meta := node.GetMeta()
-		if meta == nil {
-			continue
-		}
-		var obj = make(map[string]string, len(meta))
-		for _, m := range meta {
-			obj[m.GetKey()] = string(m.GetValue())
-		}
-		objects = append(objects, obj)
-	}
-
-	return objects, nil
-}

internal/handler/handler_test.go

@@ -57,10 +57,11 @@ func (c *configMock) IndexPageEnabled() bool {
 	return false
 }
 
-func (c *configMock) IndexPageTemplatePath() string {
+func (c *configMock) IndexPageTemplate() string {
 	return ""
 }
-func (c *configMock) IndexPageTemplate() string {
+
+func (c *configMock) IndexPageNativeTemplate() string {
 	return ""
 }
 

internal/handler/utils.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/valyala/fasthttp"
 	"go.uber.org/zap"
@@ -61,6 +62,14 @@ func checkErrorType(err error) int {
 	}
 }
 
+func loadAttributes(attrs []object.Attribute) map[string]string {
+	result := make(map[string]string)
+	for _, attr := range attrs {
+		result[attr.Key()] = attr.Value()
+	}
+	return result
+}
+
 func isValidToken(s string) bool {
 	for _, c := range s {
 		if c <= ' ' || c > 127 {

internal/logs/logs.go

@@ -31,8 +31,9 @@ const (
 	CouldNotStoreFileInFrostfs                                            = "could not store file in frostfs"                                                        // Error in ../../uploader/upload.go
 	AddAttributeToResultObject                                            = "add attribute to result object"                                                         // Debug in ../../uploader/filter.go
 	FailedToCreateResolver                                                = "failed to create resolver"                                                              // Fatal in ../../app.go
-	FailedToReadIndexPageTemplate                                         = "failed to read index page template, set default"                                        // Warn in ../../app.go
+	FailedToReadIndexPageTemplate                                         = "failed to read index page template"                                                     // Fatal in ../../app.go
 	SetCustomIndexPageTemplate                                            = "set custom index page template"                                                         // Info in ../../app.go
+	SetDefaultIndexPageTemplate                                           = "set default index page template"                                                        // Info in ../../app.go
 	ContainerResolverWillBeDisabledBecauseOfResolversResolverOrderIsEmpty = "container resolver will be disabled because of resolvers 'resolver_order' is empty"     // Info in ../../app.go
 	MetricsAreDisabled                                                    = "metrics are disabled"                                                                   // Warn in ../../app.go
 	NoWalletPathSpecifiedCreatingEphemeralKeyAutomaticallyForThisRun      = "no wallet path specified, creating ephemeral key automatically for this run"            // Info in ../../app.go
@@ -71,6 +72,7 @@ const (
 	AddedStoragePeer                                                      = "added storage peer"                                                                     // Info in ../../settings.go
 	CouldntGetBucket                                                      = "could not get bucket"                                                                   // Error in ../handler/utils.go
 	CouldntPutBucketIntoCache                                             = "couldn't put bucket info into cache"                                                    // Warn in ../handler/handler.go
+	FailedToHeadObject                                                    = "failed to HEAD object"                                                                  // Error in ../handler/handler.go
 	InvalidCacheEntryType                                                 = "invalid cache entry type"                                                               // Warn in ../cache/buckets.go
 	InvalidLifetimeUsingDefaultValue                                      = "invalid lifetime, using default value (in seconds)"                                     // Error in ../../cmd/http-gw/settings.go
 	InvalidCacheSizeUsingDefaultValue                                     = "invalid cache size, using default value"                                                // Error in ../../cmd/http-gw/settings.go

internal/templates/index.gotmpl

@@ -1,10 +1,11 @@
-{{$bucketName := .BucketName}}
+{{$container := .Container}}
 {{ $prefix := trimPrefix .Prefix }}
 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8"/>
-    <title>Index of s3://{{$bucketName}}/{{if $prefix}}/{{$prefix}}/{{end}}</title>
+    <title>Index of {{.Protocol}}://{{$container}}
+        /{{if $prefix}}/{{$prefix}}/{{end}}</title>
     <style>
         table {
             width: 80%;
@@ -23,15 +24,20 @@
         th {
             background-color: #c3bcbc;
         }
+
+        h1 {
+            font-size: 1.5em;
+        }
         tr:nth-child(even) {background-color: #ebe7e7;}
     </style>
 </head>
 <body>
-<h1>Index of s3://{{$bucketName}}/{{if $prefix}}{{$prefix}}/{{end}}</h1>
+<h1>Index of {{.Protocol}}://{{$container}}/{{if $prefix}}{{$prefix}}/{{end}}</h1>
 <table>
     <thead>
     <tr>
         <th>Filename</th>
+        <th>OID</th>
         <th>Size</th>
         <th>Created</th>
         <th>Download</th>
@@ -42,20 +48,22 @@
     {{if $trimmedPrefix }}
         <tr>
             <td>
-                ⮐<a href="/get/{{$bucketName}}{{ urlencode $trimmedPrefix "" }}">..</a>
+                ⮐<a href="/get/{{$container}}{{ urlencode $trimmedPrefix }}/">..</a>
             </td>
             <td></td>
             <td></td>
             <td></td>
+            <td></td>
         </tr>
     {{else}}
         <tr>
             <td>
-                ⮐<a href="/get/{{ $bucketName }}/">..</a>
+                ⮐<a href="/get/{{$container}}/">..</a>
             </td>
             <td></td>
             <td></td>
             <td></td>
+            <td></td>
         </tr>
     {{end}}
     {{range .Objects}}
@@ -63,21 +71,31 @@
             <td>
                 {{if .IsDir}}
                     🗀
-                    <a href="/get/{{ $bucketName }}{{ urlencode $prefix .FileName }}/">
+                    <a href="/get/{{$container}}{{ urlencode .FilePath }}/">
                         {{.FileName}}/
                     </a>
+                {{else if .OID}}
+                    🗎
+                    <a href="/get/{{$container}}/{{ .OID }}">
+                        {{.FileName}}
+                    </a>
                 {{else}}
                     🗎
-                    <a href="/get/{{ $bucketName }}{{ urlencode $prefix .FileName }}">
+                    <a href="/get/{{$container}}{{ urlencode .FilePath }}">
                         {{.FileName}}
                     </a>
                 {{end}}
             </td>
-            <td>{{if not .IsDir}}{{ formatSize .Size }}{{end}}</td>
+            <td>{{.OID}}</td>
-            <td>{{if not .IsDir}}{{ formatTimestamp .Created }}{{end}}</td>
+            <td>{{if .Size}}{{ formatSize .Size }}{{end}}</td>
+            <td>{{ .Created }}</td>
             <td>
-                {{ if not .IsDir }}
+                {{if .OID}}
-                    <a href="/get/{{ $bucketName}}{{ urlencode $prefix .FileName }}?download=true">
+                    <a href="/get/{{$container}}/{{ .OID }}?download=true">
+                        Link
+                    </a>
+                {{else}}
+                    <a href="/get/{{$container}}{{ urlencode .FilePath }}?download=true">
                         Link
                     </a>
                 {{ end }}