add support for embed.FS

core/router/api_builder.go

@@ -1,8 +1,10 @@
 package router
 
 import (
+	"embed"
 	"errors"
 	"fmt"
+	stdfs "io/fs"
 	"net/http"
 	"os"
 	"path"
@@ -633,6 +635,21 @@ func (api *APIBuilder) HandleDir(requestPath string, fsOrDir interface{}, opts .
 		fs = http.Dir(v)
 	case http.FileSystem:
 		fs = v
+	case embed.FS:
+		direEtries, err := v.ReadDir(".")
+		if err != nil {
+			panic(err)
+		}
+
+		if len(direEtries) == 0 {
+			panic("HandleDir: no directories found under the embedded file system")
+		}
+
+		subfs, err := stdfs.Sub(v, direEtries[0].Name())
+		if err != nil {
+			panic(err)
+		}
+		fs = http.FS(subfs)
 	default:
 		panic(fmt.Errorf(`unexpected "fsOrDir" argument type of %T (string or http.FileSystem)`, v))
 	}