Restrict WifiScanModeActivity for guest user

- Don't show WifiScanModeActivity if the user is a guest.

Bug: 235601169
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=WifiScanModeActivityTest

Change-Id: I8f1d162d9b15116c3deb3656b9af6851d4514947

src/com/android/settings/wifi/WifiScanModeActivity.java

@@ -18,11 +18,15 @@ package com.android.settings.wifi;
 
 import android.app.Dialog;
 import android.app.settings.SettingsEnums;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.net.wifi.WifiManager;
 import android.os.Bundle;
+import android.os.UserManager;
 import android.text.TextUtils;
+import android.util.EventLog;
+import android.util.Log;
 import android.view.WindowManager;
 
 import androidx.annotation.VisibleForTesting;
@@ -39,6 +43,7 @@ import com.android.settingslib.wifi.WifiPermissionChecker;
  * This activity requests users permission to allow scanning even when Wi-Fi is turned off
  */
 public class WifiScanModeActivity extends FragmentActivity {
+    private static final String TAG = "WifiScanModeActivity";
     private DialogFragment mDialog;
     @VisibleForTesting
     String mApp;
@@ -78,7 +83,15 @@ public class WifiScanModeActivity extends FragmentActivity {
         mApp = Utils.getApplicationLabel(getApplicationContext(), packageName).toString();
     }
 
-    private void createDialog() {
+    @VisibleForTesting
+    void createDialog() {
+        if (isGuestUser(getApplicationContext())) {
+            Log.e(TAG, "Guest user is not allowed to configure Wi-Fi Scan Mode!");
+            EventLog.writeEvent(0x534e4554, "235601169", -1 /* UID */, "User is a guest");
+            finish();
+            return;
+        }
+
         if (mDialog == null) {
             mDialog = AlertDialogFragment.newInstance(mApp);
             mDialog.show(getSupportFragmentManager(), "dialog");
@@ -169,4 +182,11 @@ public class WifiScanModeActivity extends FragmentActivity {
             ((WifiScanModeActivity) getActivity()).doNegativeClick();
         }
     }
+
+    private static boolean isGuestUser(Context context) {
+        if (context == null) return false;
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        if (userManager == null) return false;
+        return userManager.isGuestUser();
+    }
 }