android: make intent optional in onStartCommand (#229)

Updates tailscale/corp#18202

Kotlin requires a nullable optional here.  The rest of this is ktfmt

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

android/src/main/java/com/tailscale/ipn/IPNService.kt

@@ -10,27 +10,28 @@ import android.os.Build
 import android.system.OsConstants
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
-import libtailscale.Libtailscale
 import java.util.UUID
+import libtailscale.Libtailscale
 
 open class IPNService : VpnService(), libtailscale.IPNService {
   private val randomID: String = UUID.randomUUID().toString()
+
   override fun id(): String {
     return randomID
   }
 
-    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
-        if (intent != null && ACTION_STOP_VPN == intent.getAction()) {
-            (getApplicationContext() as App).autoConnect = false
+  override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+    if (intent != null && ACTION_STOP_VPN == intent.action) {
+      (applicationContext as App).autoConnect = false
       close()
       return START_NOT_STICKY
     }
-        val app = getApplicationContext() as App
-        if (intent != null && "android.net.VpnService" == intent.getAction()) {
+    val app = applicationContext as App
+    if (intent != null && "android.net.VpnService" == intent.action) {
       // Start VPN and connect to it due to Always-on VPN
       val i = Intent(IPNReceiver.INTENT_CONNECT_VPN)
-            i.setPackage(getPackageName())
-            i.setClass(getApplicationContext(), IPNReceiver::class.java)
+      i.setPackage(packageName)
+      i.setClass(applicationContext, IPNReceiver::class.java)
       sendBroadcast(i)
       Libtailscale.requestVPN(this)
       app.setWantRunning(true)
@@ -38,12 +39,11 @@ open class IPNService : VpnService(), libtailscale.IPNService {
     }
     Libtailscale.requestVPN(this)
     if (app.vpnReady && app.autoConnect) {
-            app.setWantRunning(true);
+      app.setWantRunning(true)
     }
     return START_STICKY
   }
 
-
   private fun close() {
     stopForeground(true)
     Libtailscale.serviceDisconnect(this)
@@ -60,24 +60,29 @@ open class IPNService : VpnService(), libtailscale.IPNService {
   }
 
   private fun configIntent(): PendingIntent {
-        return PendingIntent.getActivity(this, 0, Intent(this, IPNActivity::class.java),
+    return PendingIntent.getActivity(
+        this,
+        0,
+        Intent(this, IPNActivity::class.java),
         PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE)
   }
 
   private fun disallowApp(b: Builder, name: String) {
     try {
       b.addDisallowedApplication(name)
-        } catch (e: PackageManager.NameNotFoundException) {
-        }
+    } catch (e: PackageManager.NameNotFoundException) {}
   }
 
   override fun newBuilder(): VPNServiceBuilder {
-        val b: Builder = Builder()
+    val b: Builder =
+        Builder()
             .setConfigureIntent(configIntent())
             .allowFamily(OsConstants.AF_INET)
             .allowFamily(OsConstants.AF_INET6)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) b.setMetered(false) // Inherit the metered status from the underlying networks.
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) b.setUnderlyingNetworks(null) // Use all available networks.
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
+        b.setMetered(false) // Inherit the metered status from the underlying networks.
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
+        b.setUnderlyingNetworks(null) // Use all available networks.
 
     // RCS/Jibe https://github.com/tailscale/tailscale/issues/2322
     disallowApp(b, "com.google.android.apps.messaging")
@@ -101,7 +106,8 @@ open class IPNService : VpnService(), libtailscale.IPNService {
   }
 
   fun notify(title: String?, message: String?) {
-        val builder: NotificationCompat.Builder = NotificationCompat.Builder(this, App.NOTIFY_CHANNEL_ID)
+    val builder: NotificationCompat.Builder =
+        NotificationCompat.Builder(this, App.NOTIFY_CHANNEL_ID)
             .setSmallIcon(R.drawable.ic_notification)
             .setContentTitle(title)
             .setContentText(message)
@@ -114,7 +120,8 @@ open class IPNService : VpnService(), libtailscale.IPNService {
   }
 
   fun updateStatusNotification(title: String?, message: String?) {
-        val builder: NotificationCompat.Builder = NotificationCompat.Builder(this, App.STATUS_CHANNEL_ID)
+    val builder: NotificationCompat.Builder =
+        NotificationCompat.Builder(this, App.STATUS_CHANNEL_ID)
             .setSmallIcon(R.drawable.ic_notification)
             .setContentTitle(title)
             .setContentText(message)