Push distributor: ensure the current UnifiedPush distributor is stored

libraries/pushproviders/api/src/main/kotlin/io/element/android/libraries/pushproviders/api/Distributor.kt

@@ -16,6 +16,14 @@
 
 package io.element.android.libraries.pushproviders.api
 
+/**
+ * Firebase does not have the concept of distributor. So for Firebase, there will be one distributor:
+ * Distributor("Firebase", "Firebase").
+ *
+ * For UnifiedPush, for instance, the Distributor can be:
+ * Distributor("io.heckel.ntfy", "ntfy").
+ * But other values are possible.
+ */
 data class Distributor(
     val value: String,
     val name: String,

libraries/pushproviders/api/src/main/kotlin/io/element/android/libraries/pushproviders/api/PushProvider.kt

@@ -44,6 +44,11 @@ interface PushProvider {
      */
     suspend fun registerWith(matrixClient: MatrixClient, distributor: Distributor)
 
+    /**
+     * Return the current distributor, or null if none.
+     */
+    suspend fun getCurrentDistributor(matrixClient: MatrixClient): Distributor?
+
     /**
      * Unregister the pusher.
      */