feat: add option to use virtual empty root directory

Author: marjune163

README.md

@@ -48,6 +48,10 @@ server [options]
     Root directory of the server.
     Defaults to current working directory.
 
+-R|--empty-root
+    Use virtual empty directory as root directory.
+    Useful to share alias directories only.
+
 -x|--fallback-proxy <separator><url-path><separator><proxy-target> ...
     If local resource under <url-path> not found, reverse proxy to <proxy-target>.
     <proxy-target> must be the format of schema://host/path.

src/app/main.go

@@ -65,6 +65,7 @@ func NewApp(params []*param.Param) *App {
 			}
 		}
 
+		// init vhost
 		listens := p.Listens
 		if len(listens) == 0 && len(p.ListensPlain) == 0 && len(p.ListensTLS) == 0 {
 			if cert == nil {
@@ -74,7 +75,6 @@ func NewApp(params []*param.Param) *App {
 			}
 		}
 
-		// init vhost
 		errors = vhSvc.Add(&goVirtualHost.HostInfo{
 			Listens:      listens,
 			ListensPlain: p.ListensPlain,

src/param/cli.go

@@ -21,6 +21,9 @@ func init() {
 	err = options.AddFlagsValue("root", []string{"-r", "--root"}, "GHFS_ROOT", ".", "root directory of server")
 	serverErrHandler.CheckFatal(err)
 
+	err = options.AddFlags("emptyroot", []string{"-R", "--empty-root"}, "GHFS_EMPTY_ROOT", "use virtual empty root directory")
+	serverErrHandler.CheckFatal(err)
+
 	err = options.AddFlagsValues("fallbackproxies", []string{"-x", "--fallback-proxy"}, "", nil, "reverse proxy to target if local resource not found, <sep><url><sep><target>, e.g. :/doc:http://remote/doc")
 	serverErrHandler.CheckFatal(err)
 
@@ -186,6 +189,7 @@ func doParseCli() []*Param {
 
 		// normalize option
 		param.Root, _ = result.GetString("root")
+		param.EmptyRoot = result.HasKey("emptyroot")
 		param.IgnoreProxyTargetBadCert = result.HasKey("ignorebadproxycert")
 		param.GlobalUpload = result.HasKey("globalupload")
 		param.GlobalArchive = result.HasKey("globalarchive")

src/param/main.go

@@ -8,7 +8,8 @@ type user struct {
 }
 
 type Param struct {
-	Root string
+	Root      string
+	EmptyRoot bool
 
 	FallbackProxies          map[string]string
 	AlwaysProxies            map[string]string

src/serverHandler/main.go

@@ -12,6 +12,7 @@ import (
 
 type handler struct {
 	root      string
+	emptyRoot bool
 	urlPrefix string
 
 	fallbackProxies proxyHandlers
@@ -131,6 +132,7 @@ func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 func NewHandler(
 	root string,
+	emptyRoot bool,
 	urlPrefix string,
 	p *param.Param,
 	users user.Users,
@@ -157,6 +159,7 @@ func NewHandler(
 
 	h := &handler{
 		root:      root,
+		emptyRoot: emptyRoot,
 		urlPrefix: urlPrefix,
 
 		fallbackProxies: fallbackProxies,

src/serverHandler/responseData.go

@@ -239,7 +239,7 @@ func (h *handler) getResponseData(r *http.Request, visitFs bool) (data *response
 		reqFsPath = path.Clean(h.root + reqPath)
 	}
 
-	file, item, _statErr := stat(reqFsPath, visitFs)
+	file, item, _statErr := stat(reqFsPath, visitFs && !h.emptyRoot)
 	if _statErr != nil {
 		errs = append(errs, _statErr)
 		notFound = os.IsNotExist(_statErr)

src/vhostMux/main.go

@@ -58,13 +58,17 @@ func NewServeMux(
 
 	// register handlers
 	aliases := p.Aliases
-	if _, hasRootAlias := aliases["/"]; !hasRootAlias {
+	_, hasRootAlias := aliases["/"]
+	emptyRoot := false
+	if !hasRootAlias {
 		aliases["/"] = p.Root
+		emptyRoot = p.EmptyRoot
 	}
 
 	handlers := map[string]http.Handler{}
 	for urlPath, fsPath := range aliases {
-		handlers[urlPath] = serverHandler.NewHandler(fsPath, urlPath, p, users, fallbackProxies, alwaysProxies, tplObj, logger, errorHandler)
+		emptyHandlerRoot := emptyRoot && urlPath == "/"
+		handlers[urlPath] = serverHandler.NewHandler(fsPath, emptyHandlerRoot, urlPath, p, users, fallbackProxies, alwaysProxies, tplObj, logger, errorHandler)
 	}
 
 	// create ServeMux