Create service side `AuthTokenCache` helper class

1 files changed, 46 insertions, 0 deletions

diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/service/endpoint/AuthTokenCache.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/service/endpoint/AuthTokenCache.kt
new file mode 100644
index 0000000000..3d0c4299ec
--- /dev/null
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/service/endpoint/AuthTokenCache.kt
@@ -0,0 +1,46 @@
+package net.mullvad.mullvadvpn.service.endpoint
+
+import kotlin.properties.Delegates.observable
+import net.mullvad.mullvadvpn.ipc.Event
+import net.mullvad.mullvadvpn.ipc.Request
+import net.mullvad.mullvadvpn.service.MullvadDaemon
+
+class AuthTokenCache(endpoint: ServiceEndpoint) {
+    private var waitingForDaemon = false
+
+    var authToken by observable<String?>(null) { _, _, token ->
+        endpoint.sendEvent(Event.AuthToken(token))
+    }
+        private set
+
+    var daemon by observable<MullvadDaemon?>(null) { _, _, _ ->
+        synchronized(this@AuthTokenCache) {
+            if (waitingForDaemon) {
+                fetchNewToken()
+            }
+        }
+    }
+
+    init {
+        endpoint.dispatcher.registerHandler(Request.FetchAuthToken::class) { _ ->
+            fetchNewToken()
+        }
+    }
+
+    fun onDestroy() {
+        daemon = null
+    }
+
+    private fun fetchNewToken() {
+        synchronized(this) {
+            val daemon = this.daemon
+
+            if (daemon != null) {
+                authToken = daemon.getWwwAuthToken()
+                waitingForDaemon = false
+            } else {
+                waitingForDaemon = true
+            }
+        }
+    }
+}