cmd/swarm: auto resolve default path according to env flag (#17960)

cmd/swarm/config.go

@@ -80,6 +80,7 @@ const (
 	SWARM_ENV_STORE_CAPACITY          = "SWARM_STORE_CAPACITY"
 	SWARM_ENV_STORE_CACHE_CAPACITY    = "SWARM_STORE_CACHE_CAPACITY"
 	SWARM_ACCESS_PASSWORD             = "SWARM_ACCESS_PASSWORD"
+	SWARM_AUTO_DEFAULTPATH            = "SWARM_AUTO_DEFAULTPATH"
 	GETH_ENV_DATADIR                  = "GETH_DATADIR"
 )
 

cmd/swarm/upload.go

@@ -26,8 +26,10 @@ import (
 	"os/user"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 
+	"github.com/ethereum/go-ethereum/log"
 	swarm "github.com/ethereum/go-ethereum/swarm/api/client"
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -55,9 +57,16 @@ func upload(ctx *cli.Context) {
 		mimeType        = ctx.GlobalString(SwarmUploadMimeType.Name)
 		client          = swarm.NewClient(bzzapi)
 		toEncrypt       = ctx.Bool(SwarmEncryptedFlag.Name)
+		autoDefaultPath = false
 		file            string
 	)
-
+	if autoDefaultPathString := os.Getenv(SWARM_AUTO_DEFAULTPATH); autoDefaultPathString != "" {
+		b, err := strconv.ParseBool(autoDefaultPathString)
+		if err != nil {
+			utils.Fatalf("invalid environment variable %s: %v", SWARM_AUTO_DEFAULTPATH, err)
+		}
+		autoDefaultPath = b
+	}
 	if len(args) != 1 {
 		if fromStdin {
 			tmp, err := ioutil.TempFile("", "swarm-stdin")
@@ -106,6 +115,15 @@ func upload(ctx *cli.Context) {
 			if !recursive {
 				return "", errors.New("Argument is a directory and recursive upload is disabled")
 			}
+			if autoDefaultPath && defaultPath == "" {
+				defaultEntryCandidate := path.Join(file, "index.html")
+				log.Debug("trying to find default path", "path", defaultEntryCandidate)
+				defaultEntryStat, err := os.Stat(defaultEntryCandidate)
+				if err == nil && !defaultEntryStat.IsDir() {
+					log.Debug("setting auto detected default path", "path", defaultEntryCandidate)
+					defaultPath = defaultEntryCandidate
+				}
+			}
 			if defaultPath != "" {
 				// construct absolute default path
 				absDefaultPath, _ := filepath.Abs(defaultPath)