Fix for securing wlan.ini (#1509)

* Fix for securing wlan.ini

* Fixing error with ' instead of "

* Changing to errorcode 403

* maybe strcmp instead of regular ==

Co-authored-by: Pär Hedberg <par.hedberg@nordicmedtest.se>

code/components/jomjol_fileserver_ota/server_file.cpp

@@ -831,6 +831,12 @@ static esp_err_t delete_post_handler(httpd_req_t *req)
             return ESP_FAIL;
         }
 
+        if (strcmp(filename, "wlan.ini") == 0) {
+            ESP_LOGE(TAG, "Trying to delete protected file : %s", filename);
+            httpd_resp_send_err(req, HTTPD_403_FORBIDDEN, "Not allowed to delete wlan.ini");
+            return ESP_FAIL;
+        }
+
         if (stat(filepath, &file_stat) == -1) {
             ESP_LOGE(TAG, "File does not exist: %s", filename);
             /* Respond with 400 Bad Request */