From 84a8b210f5e356139efc86d2c10c0288a471581e Mon Sep 17 00:00:00 2001
From: Michael Eischer <michael.eischer@fau.de>
Date: Fri, 16 Jun 2023 21:52:50 +0200
Subject: [PATCH] return empty array if there are no objects to list

Previously "null" was returned, which does not match the REST backend
specification.
---
 handlers_test.go | 24 ++++++++++++++++++++++++
 repo/repo.go     |  4 ++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/handlers_test.go b/handlers_test.go
index 7907825..9951118 100644
--- a/handlers_test.go
+++ b/handlers_test.go
@@ -379,6 +379,30 @@ func TestResticErrorHandler(t *testing.T) {
 	}
 }
 
+func TestEmptyList(t *testing.T) {
+	mux, _, _, _, cleanup := createTestHandler(t, Server{
+		AppendOnly: true,
+		NoAuth:     true,
+		Debug:      true,
+	})
+	defer cleanup()
+
+	// create the repo
+	checkRequest(t, mux.ServeHTTP,
+		newRequest(t, "POST", "/?create=true", nil),
+		[]wantFunc{wantCode(http.StatusOK)})
+
+	for i := 1; i <= 2; i++ {
+		req := newRequest(t, "GET", "/data/", nil)
+		if i == 2 {
+			req.Header.Set("Accept", "application/vnd.x.restic.rest.v2")
+		}
+
+		checkRequest(t, mux.ServeHTTP, req,
+			[]wantFunc{wantCode(http.StatusOK), wantBody("[]")})
+	}
+}
+
 func TestListWithUnexpectedFiles(t *testing.T) {
 	mux, _, _, tempdir, cleanup := createTestHandler(t, Server{
 		AppendOnly: true,
diff --git a/repo/repo.go b/repo/repo.go
index a1ad642..d04879a 100644
--- a/repo/repo.go
+++ b/repo/repo.go
@@ -375,7 +375,7 @@ func (h *Handler) listBlobsV1(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	var names []string
+	names := []string{}
 	for _, i := range items {
 		if isHashed(objectType) {
 			if !i.IsDir() {
@@ -434,7 +434,7 @@ func (h *Handler) listBlobsV2(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	var blobs []Blob
+	blobs := []Blob{}
 	for _, i := range items {
 		if isHashed(objectType) {
 			if !i.IsDir() {