[#XX] get/head: Middleware refactor

Add:
 * search index.html
 * fallback by leading slash
Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

cmd/http-gw/app.go

@@ -111,6 +111,7 @@ type (
 		defaultNamespaces           []string
 		cors                        *data.CORSRule
 		enableFilepathFallback      bool
+		enableFilepathSlashFallback bool
 	}
 
 	tagsConfig struct {
@@ -296,6 +297,7 @@ func (s *appSettings) update(v *viper.Viper, l *zap.Logger) {
 	indexPage, indexEnabled := fetchIndexPageTemplate(v, l)
 	cors := fetchCORSConfig(v)
 	enableFilepathFallback := v.GetBool(cfgFeaturesEnableFilepathFallback)
+	enableFilepathSlashFallback := v.GetBool(cfgFeaturesEnableFilepathSlashFallback)
 
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -311,6 +313,7 @@ func (s *appSettings) update(v *viper.Viper, l *zap.Logger) {
 	s.indexPageTemplate = indexPage
 	s.cors = cors
 	s.enableFilepathFallback = enableFilepathFallback
+	s.enableFilepathSlashFallback = enableFilepathSlashFallback
 }
 
 func (s *loggerSettings) DroppedLogsInc() {
@@ -421,6 +424,12 @@ func (s *appSettings) EnableFilepathFallback() bool {
 	return s.enableFilepathFallback
 }
 
+func (s *appSettings) EnableFilepathSlashFallback() bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.enableFilepathSlashFallback
+}
+
 func (a *app) initResolver() {
 	var err error
 	a.resolver, err = resolver.NewContainerResolver(a.getResolverConfig())

cmd/http-gw/settings.go

@@ -181,6 +181,7 @@ const (
 
 	// Feature.
 	cfgFeaturesEnableFilepathFallback      = "features.enable_filepath_fallback"
+	cfgFeaturesEnableFilepathSlashFallback = "features.enable_filepath_slash_fallback"
 	cfgFeaturesTreePoolNetmapSupport       = "features.tree_pool_netmap_support"
 
 	// Containers.

config/config.env

@@ -174,6 +174,8 @@ HTTP_GW_INDEX_PAGE_TEMPLATE_PATH=internal/handler/templates/index.gotmpl
 
 # Enable using fallback path to search for a object by attribute
 HTTP_GW_FEATURES_ENABLE_FILEPATH_FALLBACK=false
+# See description in docs/gate-configuration.md
+HTTP_GW_FEATURES_ENABLE_FILEPATH_SLASH_FALLBACK=false
 # Enable using new version of tree pool, which uses netmap to select nodes, for requests to tree service
 HTTP_GW_FEATURES_TREE_POOL_NETMAP_SUPPORT=true
 

config/config.yaml

@@ -192,6 +192,8 @@ multinet:
 features:
   # Enable using fallback path to search for a object by attribute
   enable_filepath_fallback: false
+  # See description in docs/gate-configuration.md
+  enable_filepath_slash_fallback: false
   # Enable using new version of tree pool, which uses netmap to select nodes, for requests to tree service
   tree_pool_netmap_support: true
 

docs/gate-configuration.md

@@ -8,7 +8,6 @@ There are some custom types used for brevity:
 * `duration` -- string consisting of a number and a suffix. Suffix examples include `s` (seconds), `m` (minutes), `ms` (
   milliseconds).
 
-
 # Reload on SIGHUP
 
 Some config values can be reloaded on SIGHUP signal.
@@ -163,7 +162,6 @@ server:
 | `tls.cert_file` | `string` | yes           |                | Path to the TLS certificate.                  |
 | `tls.key_file`  | `string` | yes           |                | Path to the key.                              |
 
-
 # `logger` section
 
 ```yaml
@@ -235,7 +233,6 @@ web:
 | `stream_request_body`   | `bool`     | `true`        | Enables request body streaming, and calls the handler sooner when given body is larger than the current limit.                                                                                           |
 | `max_request_body_size` | `int`      | `4194304`     | Maximum request body size. The server rejects requests with bodies exceeding this limit.                                                                                                                 |
 
-
 # `upload-header` section
 
 ```yaml
@@ -271,7 +268,6 @@ archive:
 |---------------|--------|---------------|---------------|------------------------------------------------------------------|
 | `compression` | `bool` | yes           | `false`       | Enable archive compression when download files by common prefix. |
 
-
 # `pprof` section
 
 Contains configuration for the `pprof` profiler.
@@ -320,14 +316,13 @@ tracing:
 ```
 
 | Parameter    | Type                                   | SIGHUP reload | Default value | Description                                                                                                                     |
-| ------------ | -------------------------------------- | ------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------- |
+|--------------|----------------------------------------|---------------|---------------|---------------------------------------------------------------------------------------------------------------------------------|
 | `enabled`    | `bool`                                 | yes           | `false`       | Flag to enable the tracing.                                                                                                     |
 | `exporter`   | `string`                               | yes           |               | Trace collector type (`stdout` or `otlp_grpc` are supported).                                                                   |
 | `endpoint`   | `string`                               | yes           |               | Address of collector endpoint for OTLP exporters.                                                                               |
 | `trusted_ca` | `string`                               | yes           |               | Path to certificate of a certification authority in pem format, that issued the TLS certificate of the telemetry remote server. |
 | `attributes` | [[]Attributes](#attributes-subsection) | yes           |               | An array of configurable attributes in key-value format.                                                                        |
 
-
 #### `attributes` subsection
 
 ```yaml
@@ -339,11 +334,12 @@ tracing:
 ```
 
 | Parameter | Type     | SIGHUP reload | Default value | Description      |
-|-----------------------|----------|---------------|---------------|----------------------------------------------------------|
+|-----------|----------|---------------|---------------|------------------|
 | `key`     | `string` | yes           |               | Attribute key.   |
 | `value`   | `string` | yes           |               | Attribute value. |
 
 # `runtime` section
+
 Contains runtime parameters.
 
 ```yaml
@@ -372,7 +368,6 @@ frostfs:
 | `buffer_max_size_for_put` | `uint64` | yes           | `1048576`     | Sets max buffer size for read payload in put operations.                                                                  |
 | `tree_pool_max_attempts`  | `uint32` | no            | `0`           | Sets max attempt to make successful tree request. Value 0 means the number of attempts equals to number of nodes in pool. |
 
-
 ### `cache` section
 
 ```yaml
@@ -393,7 +388,6 @@ cache:
 | `netmap`  | [Cache config](#cache-subsection) | `lifetime: 1m`                  | Cache which stores netmap. `netmap.size` isn't applicable for this cache. |
 | `cors`    | [Cache config](#cache-subsection) | `lifetime: 5m`<br>`size: 1000`  | Cache which stores container CORS configurations.                         |
 
-
 #### `cache` subsection
 
 ```yaml
@@ -406,7 +400,6 @@ size: 1000
 | `lifetime` | `duration` | depends on cache | Lifetime of entries in cache. |
 | `size`     | `int`      | depends on cache | LRU cache size.               |
 
-
 # `resolve_bucket` section
 
 Bucket name resolving parameters from and to container ID.
@@ -418,7 +411,7 @@ resolve_bucket:
 ```
 
 | Parameter            | Type       | SIGHUP reload | Default value         | Description                                      |
-|----------------------|------------|---------------|-----------------------|--------------------------------------------------------------------------------------------------------------------------|
+|----------------------|------------|---------------|-----------------------|--------------------------------------------------|
 | `namespace_header`   | `string`   | yes           | `X-Frostfs-Namespace` | Header to determine zone to resolve bucket name. |
 | `default_namespaces` | `[]string` | yes           | ["","root"]           | Namespaces that should be handled as default.    |
 
@@ -512,12 +505,14 @@ Contains parameters for enabling features.
 ```yaml
 features:
   enable_filepath_fallback: true
+  enable_filepath_slash_fallback: false
   tree_pool_netmap_support: true
 ```
 
 | Parameter                                 | Type   | SIGHUP reload | Default value | Description                                                                                                                                                                                                                                                    |
-|-------------------------------------|--------|---------------|---------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+|-------------------------------------------|--------|---------------|---------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| `features.enable_filepath_fallback` | `bool` | yes           | `false`       | Enable using fallback path to search for a object by attribute. If the value of the `FilePath` attribute in the request contains no `/` symbols or single leading `/` symbol and the object was not found, then an attempt is made to search for the object by the attribute `FileName`. |
+| `features.enable_filepath_fallback`       | `bool` | yes           | `false`       | Enable using fallback path to search for a object by `FileName` attribute if object with `FilePath` attribute wasn't found.                                                                                                                                    |
+| `features.enable_filepath_slash_fallback` | `bool` | yes           | `false`       | Enable using fallback path to search for a object by `FilePath`/`FileName` with/without (depends on provided value in `FilePath`/`FileName`) if object with provided `FilePath`/`FileName` wasn't found. This fallback goes `before enable_filepath_fallback`. |
 | `features.tree_pool_netmap_support`       | `bool` | no            | `false`       | Enable using new version of tree pool, which uses netmap to select nodes, for requests to tree service.                                                                                                                                                        |
 
 # `containers` section
@@ -530,5 +525,5 @@ containers:
 ```
 
 | Parameter | Type     | SIGHUP reload | Default value | Description                             |
-|-------------|----------|---------------|---------------|-----------------------------------------|
+|-----------|----------|---------------|---------------|-----------------------------------------|
 | `cors`    | `string` | no            |               | Container name for CORS configurations. |

internal/handler/browse.go

@@ -12,7 +12,6 @@ import (
 
 	"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"
@@ -161,6 +160,7 @@ func urlencode(path string) string {
 type GetObjectsResponse struct {
 	objects   []ResponseObject
 	hasErrors bool
+	isNative  bool
 }
 
 func (h *Handler) getDirObjectsS3(ctx context.Context, bucketInfo *data.BucketInfo, prefix string) (*GetObjectsResponse, error) {
@@ -227,6 +227,7 @@ func (h *Handler) getDirObjectsNative(ctx context.Context, bucketInfo *data.Buck
 	dirs := make(map[string]struct{})
 	result := &GetObjectsResponse{
 		objects:  make([]ResponseObject, 0, 100),
+		isNative: true,
 	}
 	for objExt := range resp {
 		if objExt.Error != nil {
@@ -324,26 +325,14 @@ func (h *Handler) headDirObject(ctx context.Context, cnrID cid.ID, objID oid.ID,
 type browseParams struct {
 	bucketInfo *data.BucketInfo
 	prefix     string
-	isNative    bool
+	objects    *GetObjectsResponse
-	listObjects func(ctx context.Context, bucketName *data.BucketInfo, prefix string) (*GetObjectsResponse, error)
 }
 
 func (h *Handler) browseObjects(ctx context.Context, req *fasthttp.RequestCtx, p browseParams) {
 	const S3Protocol = "s3"
 	const FrostfsProtocol = "frostfs"
 
-	ctx = utils.SetReqLog(ctx, h.reqLogger(ctx).With(
+	objects := p.objects.objects
-		zap.String("bucket", p.bucketInfo.Name),
-		zap.String("container", p.bucketInfo.CID.EncodeToString()),
-		zap.String("prefix", p.prefix),
-	))
-	resp, err := p.listObjects(ctx, p.bucketInfo, p.prefix)
-	if err != nil {
-		h.logAndSendError(ctx, req, logs.FailedToListObjects, err)
-		return
-	}
-
-	objects := resp.objects
 	sort.Slice(objects, func(i, j int) bool {
 		if objects[i].IsDir == objects[j].IsDir {
 			return objects[i].FileName < objects[j].FileName
@@ -363,7 +352,7 @@ func (h *Handler) browseObjects(ctx context.Context, req *fasthttp.RequestCtx, p
 	}
 	bucketName := p.bucketInfo.Name
 	protocol := S3Protocol
-	if p.isNative {
+	if p.objects.isNative {
 		bucketName = p.bucketInfo.CID.EncodeToString()
 		protocol = FrostfsProtocol
 	}
@@ -372,7 +361,7 @@ func (h *Handler) browseObjects(ctx context.Context, req *fasthttp.RequestCtx, p
 		Prefix:    p.prefix,
 		Objects:   objects,
 		Protocol:  protocol,
-		HasErrors: resp.hasErrors,
+		HasErrors: p.objects.hasErrors,
 	}); err != nil {
 		h.logAndSendError(ctx, req, logs.FailedToExecuteTemplate, err)
 		return

internal/handler/download.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"net/url"
+	"strings"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
@@ -31,13 +32,18 @@ func (h *Handler) DownloadByAddressOrBucketName(req *fasthttp.RequestCtx) {
 
 	cidParam := req.UserValue("cid").(string)
 	oidParam := req.UserValue("oid").(string)
-	downloadParam := req.QueryArgs().GetBool("download")
 
 	ctx = utils.SetReqLog(ctx, h.reqLogger(ctx).With(
 		zap.String("cid", cidParam),
 		zap.String("oid", oidParam),
 	))
 
+	path, err := url.QueryUnescape(oidParam)
+	if err != nil {
+		h.logAndSendError(ctx, req, logs.FailedToUnescapePath, err)
+		return
+	}
+
 	bktInfo, err := h.getBucketInfo(ctx, cidParam)
 	if err != nil {
 		h.logAndSendError(ctx, req, logs.FailedToGetBucketInfo, err)
@@ -50,18 +56,159 @@ func (h *Handler) DownloadByAddressOrBucketName(req *fasthttp.RequestCtx) {
 		return
 	}
 
-	var objID oid.ID
+	prm := MiddlewareParam{
-	if checkS3Err == nil && shouldDownload(oidParam, downloadParam) {
+		Context: ctx,
-		h.byS3Path(ctx, req, bktInfo.CID, oidParam, h.receiveFile)
+		Request: req,
-	} else if err = objID.DecodeString(oidParam); err == nil {
+		BktInfo: bktInfo,
-		h.byNativeAddress(ctx, req, bktInfo.CID, objID, h.receiveFile)
+		Path:    path,
+	}
+
+	indexPageEnabled := h.config.IndexPageEnabled()
+
+	if checkS3Err == nil {
+		run(prm, h.errorMiddleware(logs.ObjectNotFound, ErrObjectNotFound),
+			Middleware{Func: h.byS3PathMiddleware(h.receiveFile, noopFormer), Enabled: true},
+			Middleware{Func: h.byS3PathMiddleware(h.receiveFile, indexFormer), Enabled: indexPageEnabled},
+			Middleware{Func: h.browseIndexMiddleware(h.getDirObjectsS3), Enabled: indexPageEnabled},
+		)
 	} else {
-		h.browseIndex(ctx, req, cidParam, oidParam, checkS3Err != nil)
+		slashFallbackEnabled := h.config.EnableFilepathSlashFallback()
+		fileNameFallbackEnabled := h.config.EnableFilepathFallback()
+
+		run(prm, h.errorMiddleware(logs.ObjectNotFound, ErrObjectNotFound),
+			Middleware{Func: h.byAddressMiddleware(h.receiveFile), Enabled: true},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFilePath, noopFormer), Enabled: true},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFilePath, reverseLeadingSlash), Enabled: slashFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFileName, noopFormer), Enabled: fileNameFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFileName, reverseLeadingSlash), Enabled: fileNameFallbackEnabled && slashFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFilePath, indexFormer), Enabled: indexPageEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.receiveFile, object.AttributeFileName, indexFormer), Enabled: fileNameFallbackEnabled && indexPageEnabled},
+			Middleware{Func: h.browseIndexMiddleware(h.getDirObjectsNative), Enabled: indexPageEnabled},
+		)
 	}
 }
 
-func shouldDownload(oidParam string, downloadParam bool) bool {
+type MiddlewareFunc func(param MiddlewareParam) bool
-	return !isDir(oidParam) || downloadParam
+
+type MiddlewareParam struct {
+	Context context.Context
+	Request *fasthttp.RequestCtx
+	BktInfo *data.BucketInfo
+	Path    string
+}
+
+type Middleware struct {
+	Func    MiddlewareFunc
+	Enabled bool
+}
+
+func run(prm MiddlewareParam, defaultMiddleware MiddlewareFunc, middlewares ...Middleware) {
+	for _, m := range middlewares {
+		if m.Enabled && !m.Func(prm) {
+			return
+		}
+	}
+
+	defaultMiddleware(prm)
+}
+
+func indexFormer(path string) string {
+	indexPath := path
+	if indexPath != "" && !strings.HasSuffix(indexPath, "/") {
+		indexPath += "/"
+	}
+
+	return indexPath + "index.html"
+}
+
+func reverseLeadingSlash(path string) string {
+	if path == "" || path == "/" {
+		return path
+	}
+
+	if path[0] == '/' {
+		return path[1:]
+	}
+
+	return "/" + path
+}
+
+func noopFormer(path string) string {
+	return path
+}
+
+func (h *Handler) byS3PathMiddleware(handler func(context.Context, *fasthttp.RequestCtx, oid.Address), pathFormer func(string) string) MiddlewareFunc {
+	return func(prm MiddlewareParam) bool {
+		ctx, span := tracing.StartSpanFromContext(prm.Context, "handler.byS3Path")
+		defer span.End()
+
+		path := pathFormer(prm.Path)
+
+		foundOID, err := h.tree.GetLatestVersion(ctx, &prm.BktInfo.CID, path)
+		if err == nil {
+			if foundOID.IsDeleteMarker {
+				h.logAndSendError(ctx, prm.Request, logs.IndexWasDeleted, ErrObjectNotFound)
+				return false
+			}
+
+			addr := newAddress(prm.BktInfo.CID, foundOID.OID)
+			handler(ctx, prm.Request, addr)
+			return false
+		}
+
+		if !errors.Is(err, layer.ErrNodeNotFound) {
+			h.logAndSendError(ctx, prm.Request, logs.FailedToGetLatestVersionOfIndexObject, err, zap.String("path", path))
+			return false
+		}
+
+		return true
+	}
+}
+
+func (h *Handler) byAttributeSearchMiddleware(handler func(context.Context, *fasthttp.RequestCtx, oid.Address), attr string, pathFormer func(string) string) MiddlewareFunc {
+	return func(prm MiddlewareParam) bool {
+		ctx, span := tracing.StartSpanFromContext(prm.Context, "handler.byAttributeSearch")
+		defer span.End()
+
+		path := pathFormer(prm.Path)
+
+		res, err := h.search(ctx, prm.BktInfo.CID, attr, path, object.MatchStringEqual)
+		if err != nil {
+			h.logAndSendError(ctx, prm.Request, logs.FailedToFindObjectByAttribute, err)
+			return false
+		}
+		defer res.Close()
+
+		buf := make([]oid.ID, 1)
+		n, err := res.Read(buf)
+		if err == nil && n > 0 {
+			addr := newAddress(prm.BktInfo.CID, buf[0])
+			handler(ctx, prm.Request, addr)
+			return false
+		}
+
+		if !errors.Is(err, io.EOF) {
+			h.logAndSendError(ctx, prm.Request, logs.FailedToFindObjectByAttribute, err)
+			return false
+		}
+
+		return true
+	}
+}
+
+func (h *Handler) byAddressMiddleware(handler func(context.Context, *fasthttp.RequestCtx, oid.Address)) MiddlewareFunc {
+	return func(prm MiddlewareParam) bool {
+		ctx, span := tracing.StartSpanFromContext(prm.Context, "handler.byAddress")
+		defer span.End()
+
+		var objID oid.ID
+		if objID.DecodeString(prm.Path) == nil {
+			handler(ctx, prm.Request, newAddress(prm.BktInfo.CID, objID))
+			return false
+		}
+
+		return true
+	}
 }
 
 // DownloadByAttribute handles attribute-based download requests.

internal/handler/handler.go

@@ -35,6 +35,7 @@ type Config interface {
 	BufferMaxSizeForPut() uint64
 	NamespaceHeader() string
 	EnableFilepathFallback() bool
+	EnableFilepathSlashFallback() bool
 	FormContainerZone(string) string
 	CORS() *data.CORSRule
 }
@@ -216,11 +217,11 @@ func (h *Handler) byNativeAddress(ctx context.Context, req *fasthttp.RequestCtx,
 
 // byS3Path is a wrapper for function (e.g. request.headObject, request.receiveFile) that
 // resolves object address from S3-like path <bucket name>/<object key>.
-func (h *Handler) byS3Path(ctx context.Context, req *fasthttp.RequestCtx, cnrID cid.ID, path string, handler func(context.Context, *fasthttp.RequestCtx, oid.Address)) {
+func (h *Handler) byS3Path(ctx context.Context, req *fasthttp.RequestCtx, bktInfo *data.BucketInfo, path string, handler func(context.Context, *fasthttp.RequestCtx, oid.Address)) {
 	ctx, span := tracing.StartSpanFromContext(ctx, "handler.byS3Path")
 	defer span.End()
 
-	foundOID, err := h.tree.GetLatestVersion(ctx, &cnrID, path)
+	foundOID, err := h.tree.GetLatestVersion(ctx, &bktInfo.CID, path)
 	if err != nil {
 		h.logAndSendError(ctx, req, logs.FailedToGetLatestVersionOfObject, err, zap.String("path", path))
 		return
@@ -230,7 +231,7 @@ func (h *Handler) byS3Path(ctx context.Context, req *fasthttp.RequestCtx, cnrID
 		return
 	}
 
-	addr := newAddress(cnrID, foundOID.OID)
+	addr := newAddress(bktInfo.CID, foundOID.OID)
 	handler(ctx, req, addr)
 }
 
@@ -418,37 +419,31 @@ func (h *Handler) readContainer(ctx context.Context, cnrID cid.ID) (*data.Bucket
 	return bktInfo, err
 }
 
-func (h *Handler) browseIndex(ctx context.Context, req *fasthttp.RequestCtx, cidParam, oidParam string, isNativeList bool) {
+type ListFunc func(ctx context.Context, bucketInfo *data.BucketInfo, prefix string) (*GetObjectsResponse, error)
-	ctx, span := tracing.StartSpanFromContext(ctx, "handler.browseIndex")
+
+func (h *Handler) browseIndexMiddleware(fn ListFunc) MiddlewareFunc {
+	return func(prm MiddlewareParam) bool {
+		ctx, span := tracing.StartSpanFromContext(prm.Context, "handler.browseIndex")
 		defer span.End()
 
-	if !h.config.IndexPageEnabled() {
+		ctx = utils.SetReqLog(ctx, h.reqLogger(ctx).With(
-		req.SetStatusCode(fasthttp.StatusNotFound)
+			zap.String("bucket", prm.BktInfo.Name),
-		return
+			zap.String("container", prm.BktInfo.CID.EncodeToString()),
-	}
+			zap.String("prefix", prm.Path),
+		))
 
-	unescapedKey, err := url.QueryUnescape(oidParam)
+		objects, err := fn(ctx, prm.BktInfo, prm.Path)
 		if err != nil {
-		h.logAndSendError(ctx, req, logs.FailedToUnescapeOIDParam, err)
+			h.logAndSendError(ctx, prm.Request, logs.FailedToListObjects, err)
-		return
+			return false
 		}
 
-	bktInfo, err := h.getBucketInfo(ctx, cidParam)
+		h.browseObjects(ctx, prm.Request, browseParams{
-	if err != nil {
+			bucketInfo: prm.BktInfo,
-		h.logAndSendError(ctx, req, logs.FailedToGetBucketInfo, err)
+			prefix:     prm.Path,
-		return
+			objects:    objects,
-	}
-
-	listFunc := h.getDirObjectsS3
-	if isNativeList {
-		// tree probe failed, trying to use native
-		listFunc = h.getDirObjectsNative
-	}
-
-	h.browseObjects(ctx, req, browseParams{
-		bucketInfo:  bktInfo,
-		prefix:      unescapedKey,
-		listObjects: listFunc,
-		isNative:    isNativeList,
 		})
+
+		return false
+	}
 }

internal/handler/handler_test.go

@@ -62,7 +62,8 @@ func (t *treeServiceMock) GetLatestVersion(context.Context, *cid.ID, string) (*d
 }
 
 type configMock struct {
-	additionalSearch bool
+	additionalFilenameSearch bool
+	additionalSlashSearch    bool
 	cors                     *data.CORSRule
 }
 
@@ -99,7 +100,11 @@ func (c *configMock) NamespaceHeader() string {
 }
 
 func (c *configMock) EnableFilepathFallback() bool {
-	return c.additionalSearch
+	return c.additionalFilenameSearch
+}
+
+func (c *configMock) EnableFilepathSlashFallback() bool {
+	return c.additionalSlashSearch
 }
 
 func (c *configMock) FormContainerZone(string) string {
@@ -327,7 +332,7 @@ func TestBasic(t *testing.T) {
 
 func TestFindObjectByAttribute(t *testing.T) {
 	hc := prepareHandlerContext(t)
-	hc.cfg.additionalSearch = true
+	hc.cfg.additionalFilenameSearch = true
 
 	bktName := "bucket"
 	cnrID, cnr, err := hc.prepareContainer(bktName, acl.PublicRWExtended)
@@ -407,7 +412,7 @@ func TestFindObjectByAttribute(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			obj := hc.frostfs.objects[putRes.ContainerID+"/"+putRes.ObjectID]
 			obj.SetAttributes(tc.firstAttr, tc.secondAttr)
-			hc.cfg.additionalSearch = tc.additionalSearch
+			hc.cfg.additionalFilenameSearch = tc.additionalSearch
 
 			objID, err := hc.Handler().findObjectByAttribute(ctx, cnrID, tc.reqAttrKey, tc.reqAttrValue)
 			if tc.err != "" {
@@ -476,7 +481,7 @@ func TestNeedSearchByFileName(t *testing.T) {
 		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
-			hc.cfg.additionalSearch = tc.additionalSearch
+			hc.cfg.additionalFilenameSearch = tc.additionalSearch
 
 			res := hc.h.needSearchByFileName(tc.attrKey, tc.attrVal)
 			require.Equal(t, tc.expected, res)

internal/handler/head.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io"
 	"net/http"
+	"net/url"
 	"strconv"
 	"time"
 
@@ -128,6 +129,12 @@ func (h *Handler) HeadByAddressOrBucketName(req *fasthttp.RequestCtx) {
 		zap.String("oid", oidParam),
 	))
 
+	path, err := url.QueryUnescape(oidParam)
+	if err != nil {
+		h.logAndSendError(ctx, req, logs.FailedToUnescapePath, err)
+		return
+	}
+
 	bktInfo, err := h.getBucketInfo(ctx, cidParam)
 	if err != nil {
 		h.logAndSendError(ctx, req, logs.FailedToGetBucketInfo, err)
@@ -140,9 +147,38 @@ func (h *Handler) HeadByAddressOrBucketName(req *fasthttp.RequestCtx) {
 		return
 	}
 
+	prm := MiddlewareParam{
+		Context: ctx,
+		Request: req,
+		BktInfo: bktInfo,
+		Path:    path,
+	}
+
+	indexPageEnabled := h.config.IndexPageEnabled()
+
+	if checkS3Err == nil {
+		run(prm, h.errorMiddleware(logs.ObjectNotFound, layer.ErrNodeNotFound),
+			Middleware{Func: h.byS3PathMiddleware(h.headObject, noopFormer), Enabled: true},
+			Middleware{Func: h.byS3PathMiddleware(h.headObject, indexFormer), Enabled: indexPageEnabled},
+		)
+	} else {
+		slashFallbackEnabled := h.config.EnableFilepathSlashFallback()
+		fileNameFallbackEnabled := h.config.EnableFilepathFallback()
+
+		run(prm, h.errorMiddleware(logs.ObjectNotFound, ErrObjectNotFound),
+			Middleware{Func: h.byAddressMiddleware(h.headObject), Enabled: true},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFilePath, noopFormer), Enabled: true},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFilePath, reverseLeadingSlash), Enabled: slashFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFileName, noopFormer), Enabled: fileNameFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFileName, reverseLeadingSlash), Enabled: fileNameFallbackEnabled && slashFallbackEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFilePath, indexFormer), Enabled: indexPageEnabled},
+			Middleware{Func: h.byAttributeSearchMiddleware(h.headObject, object.AttributeFileName, indexFormer), Enabled: fileNameFallbackEnabled && indexPageEnabled},
+		)
+	}
+
 	var objID oid.ID
 	if checkS3Err == nil {
-		h.byS3Path(ctx, req, bktInfo.CID, oidParam, h.headObject)
+		h.byS3Path(ctx, req, bktInfo, oidParam, h.headObject)
 	} else if err = objID.DecodeString(oidParam); err == nil {
 		h.byNativeAddress(ctx, req, bktInfo.CID, objID, h.headObject)
 	} else {
@@ -157,3 +193,10 @@ func (h *Handler) HeadByAttribute(req *fasthttp.RequestCtx) {
 
 	h.byAttribute(ctx, req, h.headObject)
 }
+
+func (h *Handler) errorMiddleware(msg string, err error) MiddlewareFunc {
+	return func(prm MiddlewareParam) bool {
+		h.logAndSendError(prm.Context, prm.Request, msg, err)
+		return false
+	}
+}

internal/logs/logs.go

@@ -108,7 +108,9 @@ const (
 	FailedToGetBucketInfo                 = "could not get bucket info"
 	FailedToSubmitTaskToPool              = "failed to submit task to pool"
 	ObjectWasDeleted                      = "object was deleted"
+	IndexWasDeleted                       = "index was deleted"
 	FailedToGetLatestVersionOfObject      = "failed to get latest version of object"
+	FailedToGetLatestVersionOfIndexObject = "failed to get latest version of index object"
 	FailedToCheckIfSettingsNodeExist      = "failed to check if settings node exists"
 	FailedToListObjects                   = "failed to list objects"
 	FailedToParseTemplate                 = "failed to parse template"
@@ -118,7 +120,7 @@ const (
 	FailedToGetObject                     = "failed to get object"
 	FailedToGetObjectPayload              = "failed to get object payload"
 	FailedToFindObjectByAttribute         = "failed to get find object by attribute"
-	FailedToUnescapeOIDParam              = "failed to unescape oid param"
+	FailedToUnescapePath                  = "failed to unescape path"
 	InvalidOIDParam                       = "invalid oid param"
 	CouldNotGetCORSConfiguration          = "could not get cors configuration"
 	EmptyOriginRequestHeader              = "empty Origin request header"