add scam warning window

Signed-off-by: Sahil Yeole <sahilyeole93@gmail.com>

flutter/lib/mobile/pages/server_page.dart

@@ -210,11 +210,200 @@ class ServiceNotRunningNotification extends StatelessWidget {
                 .marginOnly(bottom: 8),
             ElevatedButton.icon(
                 icon: const Icon(Icons.play_arrow),
-                onPressed: serverModel.toggleService,
+                onPressed: () {
+                  if (gFFI.userModel.userName.value.isEmpty && bind.mainGetLocalOption(key: "show-scam-warning") != "N") {
+                    _showScamWarning(context, serverModel);
+                  } else {
+                    serverModel.toggleService();
+                  }
+                },
                 label: Text(translate("Start Service")))
           ],
         ));
   }
+
+  void _showScamWarning(BuildContext context, ServerModel serverModel) {
+    showDialog(
+      context: context,
+      builder: (BuildContext context) {
+        return ScamWarningDialog(serverModel: serverModel);
+      },
+    );
+  }
+
+}
+
+class ScamWarningDialog extends StatefulWidget {
+  final ServerModel serverModel;
+
+  ScamWarningDialog({required this.serverModel});
+
+  @override
+  _ScamWarningDialogState createState() => _ScamWarningDialogState();
+}
+
+class _ScamWarningDialogState extends State<ScamWarningDialog> {
+  int _countdown = 6;
+  bool show_warning = false;
+  late Timer _timer;
+  late ServerModel _serverModel;
+
+  @override
+  void initState() {
+    super.initState();
+    _serverModel = widget.serverModel;
+    startCountdown();
+  }
+
+  void startCountdown() {
+    const oneSecond = Duration(seconds: 1);
+    _timer = Timer.periodic(oneSecond, (timer) {
+      setState(() {
+        _countdown--;
+        if (_countdown <= 0) {
+          timer.cancel();
+        }
+      });
+    });
+  }
+
+  @override
+  void dispose() {
+    _timer.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final isButtonLocked = _countdown > 0;
+
+    return AlertDialog(
+      content: Container(
+        decoration: BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topRight,
+            end: Alignment.bottomLeft,
+            colors: [
+              Color(0xffe242bc),
+              Color(0xfff4727c),
+            ],
+          ),
+          borderRadius: BorderRadius.circular(20.0),
+        ),
+        padding: EdgeInsets.all(25.0),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Icon(
+                  Icons.warning_amber_sharp,
+                  color: Colors.white,
+                ),
+                SizedBox(width: 10),
+                Text(
+                  translate("Warning"),
+                  style: TextStyle(
+                    color: Colors.white,
+                    fontWeight: FontWeight.bold,
+                    fontSize: 20.0,
+                  ),
+                ),
+              ],
+            ),
+            SizedBox(height: 20),
+            Center(
+              child: Image.asset('assets/scam.png',
+              width: 180,
+              ),
+            ),
+            SizedBox(height: 18),
+            Text(
+              translate("You May Be Being SCAMMED!"),
+              textAlign: TextAlign.center,
+              style: TextStyle(
+                color: Colors.white,
+                fontWeight: FontWeight.bold,
+                fontSize: 22.0,
+              ),
+            ),
+            SizedBox(height: 18),
+            Text(
+              translate("If you are on the phone with someone you DON'T know AND TRUST who has asked you to use RustDesk and start the service, do not proceed and hang up immediately.")+"\n\n"
+              +translate("They are likely a scammer trying to steal your money or other private information.")+"\n",
+              style: TextStyle(
+                color: Colors.white,
+                fontWeight: FontWeight.bold,
+                    fontSize: 16.0,
+              ),
+            ),
+            Row(
+              children: <Widget>[
+                Checkbox(
+                  value: show_warning,
+                  onChanged: (value) {
+                    setState((){
+                      show_warning = value!;
+                    });
+                  },
+                ),
+                Text(
+                  translate("Don't show again"),
+                  style: TextStyle(
+                    color: Colors.white,
+                    fontWeight: FontWeight.bold,
+                    fontSize: 15.0,
+                  ),
+                ),
+              ],
+            ),
+            SizedBox(height: 10),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.end,
+              children: [
+                ElevatedButton(
+                  onPressed: isButtonLocked
+                      ? null
+                      : () {
+                          Navigator.of(context).pop();
+                          _serverModel.toggleService();
+                          if (show_warning) {
+                            bind.mainSetLocalOption(key: "show-scam-warning", value: "N");
+                          }
+                        },
+                  style: ElevatedButton.styleFrom(
+                    primary: Colors.blueAccent,
+                  ),
+                  child: Text(
+                  isButtonLocked ? translate("I Agree")+" (${_countdown}s)" : translate("I Agree"),
+                    style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        fontSize: 13.0,
+                    ),
+                  ),
+                ),
+                SizedBox(width: 15),
+                ElevatedButton(
+                  onPressed: () {
+                    Navigator.of(context).pop(); 
+                  },
+                  style: ElevatedButton.styleFrom(
+                    primary: Colors.blueAccent,
+                  ),
+                  child: Text(
+                    translate("Decline"),
+                    style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        fontSize: 13.0,
+                    ),
+                  ),
+                ),
+              ],
+    )])),
+    contentPadding: EdgeInsets.all(0.0),
+    );
+  }
 }
 
 class ServerInfo extends StatelessWidget {