fix(teldrive): avoid index out of range panic when listing an empty dir

drivers/teldrive/driver.go

@@ -68,6 +68,12 @@ func (d *Teldrive) List(ctx context.Context, dir model.Obj, args model.ListArgs)
 		return nil, err
 	}
 
+	// An empty directory reports totalPages == 0, which would make
+	// pagesData a zero-length slice and panic on pagesData[0] below.
+	if firstResp.Meta.TotalPages < 1 {
+		return []model.Obj{}, nil
+	}
+
 	pagesData := make([][]Object, firstResp.Meta.TotalPages)
 	pagesData[0] = firstResp.Items
 

drivers/teldrive/driver_test.go

@@ -0,0 +1,38 @@
+package teldrive
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/OpenListTeam/OpenList/v4/drivers/base"
+	"github.com/OpenListTeam/OpenList/v4/internal/model"
+	"github.com/go-resty/resty/v2"
+)
+
+// An empty directory makes the Teldrive API report totalPages == 0. List used
+// to size pagesData by that value and then write pagesData[0], which panicked
+// with "index out of range [0] with length 0" on every empty folder.
+func TestListEmptyDir(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"items":[],"meta":{"count":0,"totalPages":0,"currentPage":1}}`))
+	}))
+	defer srv.Close()
+
+	oldClient := base.RestyClient
+	base.RestyClient = resty.New()
+	defer func() { base.RestyClient = oldClient }()
+
+	d := &Teldrive{}
+	d.Address = srv.URL
+
+	objs, err := d.List(context.Background(), &model.Object{Path: "/"}, model.ListArgs{})
+	if err != nil {
+		t.Fatalf("List returned error: %v", err)
+	}
+	if len(objs) != 0 {
+		t.Fatalf("expected no entries for an empty dir, got %d", len(objs))
+	}
+}