android: hide disconnect action if force enabled (#539)

In notification, don't show 'Disconnect' button if MDM force enable is on.

Fixes tailscale/corp#23764

Signed-off-by: kari-ts <kari@tailscale.com>

Author: kari-ts

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

@@ -36,6 +36,8 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
@@ -141,17 +143,32 @@ class App : UninitializedApp(), libtailscale.AppContext, ViewModelStoreOwner {
     initViewModels()
     applicationScope.launch {
       Notifier.state.collect { state ->
-        val ableToStartVPN = state > Ipn.State.NeedsMachineAuth
-        // If VPN is stopped, show a disconnected notification. If it is running as a foregrround
-        // service, IPNService will show a connected notification.
-        if (state == Ipn.State.Stopped) {
-          notifyStatus(false)
-        }
-        val vpnRunning = state == Ipn.State.Starting || state == Ipn.State.Running
-        updateConnStatus(ableToStartVPN)
-        QuickToggleService.setVPNRunning(vpnRunning)
+        combine(Notifier.state, MDMSettings.forceEnabled.flow) { state, forceEnabled ->
+              Pair(state, forceEnabled)
+            }
+            .collect { (state, hideDisconnectAction) ->
+              val ableToStartVPN = state > Ipn.State.NeedsMachineAuth
+              // If VPN is stopped, show a disconnected notification. If it is running as a
+              // foreground
+              // service, IPNService will show a connected notification.
+              if (state == Ipn.State.Stopped) {
+                notifyStatus(vpnRunning = false, hideDisconnectAction = hideDisconnectAction.value)
+              }
+
+              val vpnRunning = state == Ipn.State.Starting || state == Ipn.State.Running
+              updateConnStatus(ableToStartVPN)
+              QuickToggleService.setVPNRunning(vpnRunning)
+
+              // Update notification status when VPN is running
+              if (vpnRunning) {
+                notifyStatus(vpnRunning = true, hideDisconnectAction = hideDisconnectAction.value)
+              }
+            }
       }
     }
+    applicationScope.launch {
+      val hideDisconnectAction = MDMSettings.forceEnabled.flow.first()
+    }
   }
 
   private fun initViewModels() {
@@ -419,8 +436,8 @@ open class UninitializedApp : Application() {
     notificationManager.createNotificationChannel(channel)
   }
 
-  fun notifyStatus(vpnRunning: Boolean) {
-    notifyStatus(buildStatusNotification(vpnRunning))
+  fun notifyStatus(vpnRunning: Boolean, hideDisconnectAction: Boolean) {
+    notifyStatus(buildStatusNotification(vpnRunning, hideDisconnectAction))
   }
 
   fun notifyStatus(notification: Notification) {
@@ -438,7 +455,7 @@ open class UninitializedApp : Application() {
     notificationManager.notify(STATUS_NOTIFICATION_ID, notification)
   }
 
-  fun buildStatusNotification(vpnRunning: Boolean): Notification {
+  fun buildStatusNotification(vpnRunning: Boolean, hideDisconnectAction: Boolean): Notification {
     val message = getString(if (vpnRunning) R.string.connected else R.string.not_connected)
     val icon = if (vpnRunning) R.drawable.ic_notification else R.drawable.ic_notification_disabled
     val action =
@@ -460,19 +477,22 @@ open class UninitializedApp : Application() {
         PendingIntent.getActivity(
             this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE)
 
-    return NotificationCompat.Builder(this, STATUS_CHANNEL_ID)
-        .setSmallIcon(icon)
-        .setContentTitle("Tailscale")
-        .setContentText(message)
-        .setAutoCancel(!vpnRunning)
-        .setOnlyAlertOnce(!vpnRunning)
-        .setOngoing(vpnRunning)
-        .setSilent(true)
-        .setOngoing(false)
-        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
-        .addAction(NotificationCompat.Action.Builder(0, actionLabel, pendingButtonIntent).build())
-        .setContentIntent(pendingIntent)
-        .build()
+    val builder =
+        NotificationCompat.Builder(this, STATUS_CHANNEL_ID)
+            .setSmallIcon(icon)
+            .setContentTitle(getString(R.string.app_name))
+            .setContentText(message)
+            .setAutoCancel(!vpnRunning)
+            .setOnlyAlertOnce(!vpnRunning)
+            .setOngoing(vpnRunning)
+            .setSilent(true)
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+            .setContentIntent(pendingIntent)
+    if (!vpnRunning || !hideDisconnectAction) {
+      builder.addAction(
+          NotificationCompat.Action.Builder(0, actionLabel, pendingButtonIntent).build())
+    }
+    return builder.build()
   }
 
   fun addUserDisallowedPackageName(packageName: String) {

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

@@ -12,13 +12,18 @@ import com.tailscale.ipn.mdm.MDMSettings
 import com.tailscale.ipn.ui.model.Ipn
 import com.tailscale.ipn.ui.notifier.Notifier
 import com.tailscale.ipn.util.TSLog
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
 import libtailscale.Libtailscale
 import java.util.UUID
 
 open class IPNService : VpnService(), libtailscale.IPNService {
   private val TAG = "IPNService"
   private val randomID: String = UUID.randomUUID().toString()
   private lateinit var app: App
+  val scope = CoroutineScope(Dispatchers.IO)
 
   override fun id(): String {
     return randomID
@@ -42,7 +47,11 @@ open class IPNService : VpnService(), libtailscale.IPNService {
           START_NOT_STICKY
         }
         ACTION_START_VPN -> {
-          showForegroundNotification()
+          scope.launch {
+            // Collect the first value of hideDisconnectAction asynchronously.
+            val hideDisconnectAction = MDMSettings.forceEnabled.flow.first()
+            showForegroundNotification(hideDisconnectAction.value)
+          }
           app.setWantRunning(true)
           Libtailscale.requestVPN(this)
           START_STICKY
@@ -51,7 +60,11 @@ open class IPNService : VpnService(), libtailscale.IPNService {
           // This means we were started by Android due to Always On VPN.
           // We show a non-foreground notification because we weren't
           // started as a foreground service.
-          app.notifyStatus(true)
+          scope.launch {
+            // Collect the first value of hideDisconnectAction asynchronously.
+            val hideDisconnectAction = MDMSettings.forceEnabled.flow.first()
+            app.notifyStatus(true, hideDisconnectAction.value)
+          }
           app.setWantRunning(true)
           Libtailscale.requestVPN(this)
           START_STICKY
@@ -60,7 +73,11 @@ open class IPNService : VpnService(), libtailscale.IPNService {
           // This means that we were restarted after the service was killed
           // (potentially due to OOM).
           if (UninitializedApp.get().isAbleToStartVPN()) {
-            showForegroundNotification()
+            scope.launch {
+              // Collect the first value of hideDisconnectAction asynchronously.
+              val hideDisconnectAction = MDMSettings.forceEnabled.flow.first()
+              showForegroundNotification(hideDisconnectAction.value)
+            }
             App.get()
             Libtailscale.requestVPN(this)
             START_STICKY
@@ -77,7 +94,7 @@ open class IPNService : VpnService(), libtailscale.IPNService {
     Libtailscale.serviceDisconnect(this)
   }
 
-  override fun disconnectVPN(){
+  override fun disconnectVPN() {
     stopSelf()
   }
 
@@ -97,11 +114,11 @@ open class IPNService : VpnService(), libtailscale.IPNService {
     app.getAppScopedViewModel().setVpnPrepared(isPrepared)
   }
 
-  private fun showForegroundNotification() {
+  private fun showForegroundNotification(hideDisconnectAction: Boolean) {
     try {
       startForeground(
           UninitializedApp.STATUS_NOTIFICATION_ID,
-          UninitializedApp.get().buildStatusNotification(true))
+          UninitializedApp.get().buildStatusNotification(true, hideDisconnectAction))
     } catch (e: Exception) {
       TSLog.e(TAG, "Failed to start foreground service: $e")
     }