fixing iscsi mapping for library

internal/httpapp/vtl_handlers.go

@@ -285,3 +285,42 @@ func (a *App) handleEjectTape(w http.ResponseWriter, r *http.Request) {
 		"drive_id": fmt.Sprintf("%d", req.DriveID),
 	})
 }
+
+// handleListVTLDevicesForISCSI returns all tape devices (drives and medium changers) for iSCSI passthrough
+func (a *App) handleListVTLDevicesForISCSI(w http.ResponseWriter, r *http.Request) {
+	devices := []map[string]interface{}{}
+
+	// Get drives
+	drives, err := a.vtlService.ListDrives()
+	if err == nil {
+		for _, drive := range drives {
+			devices = append(devices, map[string]interface{}{
+				"type":        "drive",
+				"device":      drive.Device,
+				"id":          drive.ID,
+				"library_id":  drive.LibraryID,
+				"vendor":      drive.Vendor,
+				"product":     drive.Product,
+				"description": fmt.Sprintf("Tape Drive %d (Library %d) - %s %s", drive.ID, drive.LibraryID, drive.Vendor, drive.Product),
+			})
+		}
+	}
+
+	// Get medium changers
+	changers, err := a.vtlService.ListMediaChangers()
+	if err == nil {
+		for _, changer := range changers {
+			devices = append(devices, map[string]interface{}{
+				"type":        "changer",
+				"device":      changer.Device,
+				"id":          changer.ID,
+				"library_id":  changer.LibraryID,
+				"slots":       changer.Slots,
+				"drives":      changer.Drives,
+				"description": fmt.Sprintf("Media Changer (Library %d) - %d slots, %d drives", changer.LibraryID, changer.Slots, changer.Drives),
+			})
+		}
+	}
+
+	writeJSON(w, http.StatusOK, devices)
+}