Basic check of the uploaded config file

code/espurna/web.ino

@@ -91,11 +91,16 @@ void _wsParse(uint32_t client_id, uint8_t * payload, size_t length) {
         if (action.equals("reset")) ESP.reset();
         if (action.equals("restore") && root.containsKey("data")) {
 
+            JsonObject& data = root["data"];
+            if (!data.containsKey("app") || (data["app"] != APP_NAME)) {
+                ws.text(client_id, "{\"message\": \"The file does not look like a valid configuration backup.\"}");
+                return;
+            }
+
             for (unsigned int i = EEPROM_DATA_END; i < SPI_FLASH_SEC_SIZE; i++) {
                 EEPROM.write(i, 0xFF);
             }
 
-            JsonObject& data = root["data"];
             for (auto element : data){
                 setSetting(element.key, element.value.as<char*>());
             }
@@ -731,6 +736,9 @@ void _onGetConfig(AsyncWebServerRequest *request) {
     AsyncJsonResponse * response = new AsyncJsonResponse();
     JsonObject& root = response->getRoot();
 
+    root["app"] = APP_NAME;
+    root["version"] = APP_VERSION;
+
     unsigned int size = settingsKeyCount();
     for (unsigned int i=0; i<size; i++) {
         String key = settingsKeyName(i);

code/html/custom.js

@@ -83,6 +83,7 @@ function onFileUpload(event) {
     var inputFiles = this.files;
     if (inputFiles == undefined || inputFiles.length == 0) return false;
     var inputFile = inputFiles[0];
+    this.value = "";
 
     var response = window.confirm("Previous settings will be overwritten. Are you sure you want to restore this settings?");
     if (response == false) return false;