Create `CustomDns` helper class

1 files changed, 68 insertions, 0 deletions

diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/service/CustomDns.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/service/CustomDns.kt
new file mode 100644
index 0000000000..95a4be3cb9
--- /dev/null
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/service/CustomDns.kt
@@ -0,0 +1,68 @@
+package net.mullvad.mullvadvpn.service
+
+import java.net.InetAddress
+import java.util.ArrayList
+import kotlin.properties.Delegates.observable
+import net.mullvad.mullvadvpn.model.DnsOptions
+import net.mullvad.talpid.util.EventNotifier
+
+class CustomDns(val daemon: MullvadDaemon, val settingsListener: SettingsListener) {
+    private var enabled by observable(false) { _, oldValue, newValue ->
+        if (oldValue != newValue) {
+            onEnabledChanged.notify(newValue)
+        }
+    }
+
+    private var dnsServers by observable<ArrayList<InetAddress>>(ArrayList()) { _, _, servers ->
+        onDnsServersChanged.notify(servers.toList())
+    }
+
+    val onEnabledChanged = EventNotifier(false)
+    val onDnsServersChanged = EventNotifier<List<InetAddress>>(emptyList())
+
+    init {
+        settingsListener.dnsOptionsNotifier.subscribe(this) { dnsOptions ->
+            enabled = dnsOptions.custom
+            dnsServers = ArrayList(dnsOptions.addresses)
+        }
+    }
+
+    fun onDestroy() {
+        settingsListener.dnsOptionsNotifier.unsubscribe(this)
+    }
+
+    fun enable() {
+        synchronized(this) {
+            changeDnsOptions(true, dnsServers)
+        }
+    }
+
+    fun disable() {
+        synchronized(this) {
+            changeDnsOptions(false, dnsServers)
+        }
+    }
+
+    fun addDnsServer(server: InetAddress) {
+        synchronized(this) {
+            if (!dnsServers.contains(server)) {
+                dnsServers.add(server)
+                changeDnsOptions(enabled, dnsServers)
+            }
+        }
+    }
+
+    fun removeDnsServer(server: InetAddress) {
+        synchronized(this) {
+            if (dnsServers.remove(server)) {
+                changeDnsOptions(enabled, dnsServers)
+            }
+        }
+    }
+
+    private fun changeDnsOptions(enable: Boolean, dnsServers: ArrayList<InetAddress>) {
+        val options = DnsOptions(enable, dnsServers)
+
+        daemon.setDnsOptions(options)
+    }
+}