desktop mobile QR fixes (#6069)

app/common/src/main/java/stirling/software/common/util/GeneralUtils.java

@@ -1183,4 +1183,25 @@ public class GeneralUtils {
             }
         }
     }
+
+    public String getLocalNetworkIp() {
+        try {
+            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
+            if (interfaces == null) return null;
+            while (interfaces.hasMoreElements()) {
+                NetworkInterface iface = interfaces.nextElement();
+                if (!iface.isUp() || iface.isLoopback() || iface.isVirtual()) continue;
+                Enumeration<InetAddress> addresses = iface.getInetAddresses();
+                while (addresses.hasMoreElements()) {
+                    InetAddress addr = addresses.nextElement();
+                    if (addr instanceof Inet4Address && addr.isSiteLocalAddress()) {
+                        return addr.getHostAddress();
+                    }
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Failed to detect local network IP", e);
+        }
+        return null;
+    }
 }

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ConfigController.java

@@ -20,6 +20,7 @@ import stirling.software.SPDF.config.InitialSetup;
 import stirling.software.SPDF.controller.api.security.TimestampController;
 import stirling.software.common.annotations.api.ConfigApi;
 import stirling.software.common.configuration.AppConfig;
+import stirling.software.common.util.GeneralUtils;
 import stirling.software.common.model.ApplicationProperties;
 import stirling.software.common.service.ServerCertificateServiceInterface;
 import stirling.software.common.service.UserServiceInterface;
@@ -122,8 +123,16 @@ public class ConfigController {
             configData.put("contextPath", appConfig.getContextPath());
             configData.put("serverPort", appConfig.getServerPort());
 
-            // Add frontendUrl for mobile scanner QR codes
             String frontendUrl = applicationProperties.getSystem().getFrontendUrl();
+            if ((frontendUrl == null || frontendUrl.isBlank())
+                    && Boolean.parseBoolean(
+                            System.getProperty("STIRLING_PDF_TAURI_MODE", "false"))) {
+                String localIp = GeneralUtils.getLocalNetworkIp();
+                if (localIp != null) {
+                    String scheme = appConfig.getBackendUrl().startsWith("https") ? "https" : "http";
+                    frontendUrl = scheme + "://" + localIp + ":" + appConfig.getServerPort();
+                }
+            }
             configData.put("frontendUrl", frontendUrl != null ? frontendUrl : "");
 
             // Add mobile scanner settings
@@ -385,4 +394,5 @@ public class ConfigController {
         boolean enabled = endpointConfiguration.isGroupEnabled(group);
         return ResponseEntity.ok(enabled);
     }
+
 }