Create UI side `AuthTokenCache` helper class

1 files changed, 42 insertions, 0 deletions

diff --git a/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/serviceconnection/AuthTokenCache.kt b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/serviceconnection/AuthTokenCache.kt
new file mode 100644
index 0000000000..29077e55f6
--- /dev/null
+++ b/android/src/main/kotlin/net/mullvad/mullvadvpn/ui/serviceconnection/AuthTokenCache.kt
@@ -0,0 +1,42 @@
+package net.mullvad.mullvadvpn.ui.serviceconnection
+
+import android.os.Messenger
+import java.util.LinkedList
+import kotlinx.coroutines.CompletableDeferred
+import net.mullvad.mullvadvpn.ipc.DispatchingHandler
+import net.mullvad.mullvadvpn.ipc.Event
+import net.mullvad.mullvadvpn.ipc.Request
+
+class AuthTokenCache(val connection: Messenger, eventDispatcher: DispatchingHandler<Event>) {
+    private val fetchQueue = LinkedList<CompletableDeferred<String>>()
+
+    init {
+        eventDispatcher.registerHandler(Event.AuthToken::class) { event ->
+            synchronized(this@AuthTokenCache) {
+                fetchQueue.poll()?.complete(event.token ?: "")
+            }
+        }
+    }
+
+    suspend fun fetchAuthToken(): String {
+        val authToken = CompletableDeferred<String>()
+
+        synchronized(this) {
+            fetchQueue.offer(authToken)
+        }
+
+        connection.send(Request.FetchAuthToken.message)
+
+        return authToken.await()
+    }
+
+    fun onDestroy() {
+        synchronized(this) {
+            for (pendingFetch in fetchQueue) {
+                pendingFetch.cancel()
+            }
+
+            fetchQueue.clear()
+        }
+    }
+}