android: get the Google Play account country in the google flavor

apps/multiplatform/android/src/foss/java/chat/simplex/app/PlayStore.kt

@@ -0,0 +1,4 @@
+package chat.simplex.app
+
+// Play Billing is only in the google flavor, so the Play country stays unknown here
+fun loadPlayStoreCountry() {}

apps/multiplatform/android/src/google/java/chat/simplex/app/PlayStore.kt

@@ -0,0 +1,31 @@
+package chat.simplex.app
+
+import chat.simplex.common.platform.androidAppContext
+import chat.simplex.common.platform.androidPlayStoreCountry
+import com.android.billingclient.api.*
+
+// Requests the country of the Google Play account into [androidPlayStoreCountry].
+// It stays null when Play is unavailable or the user is not signed in.
+fun loadPlayStoreCountry() {
+  val client = BillingClient.newBuilder(androidAppContext)
+    .setListener { _, _ -> }
+    .enablePendingPurchases(PendingPurchasesParams.newBuilder().enableOneTimeProducts().build())
+    .build()
+  client.startConnection(object : BillingClientStateListener {
+    override fun onBillingSetupFinished(result: BillingResult) {
+      if (result.responseCode != BillingClient.BillingResponseCode.OK) {
+        client.endConnection()
+        return
+      }
+      client.getBillingConfigAsync(GetBillingConfigParams.newBuilder().build()) { configResult, config ->
+        if (configResult.responseCode == BillingClient.BillingResponseCode.OK) {
+          androidPlayStoreCountry.value = config?.countryCode
+        }
+        client.endConnection()
+      }
+    }
+
+    // The connection is only used for this one request, it is not retried
+    override fun onBillingServiceDisconnected() = client.endConnection()
+  })
+}

apps/multiplatform/android/src/main/java/chat/simplex/app/SimplexApp.kt

@@ -341,6 +341,8 @@ class SimplexApp: Application(), LifecycleEventObserver {
 
       override fun androidIsXiaomiDevice(): Boolean = setOf("xiaomi", "redmi", "poco").contains(Build.BRAND.lowercase())
 
+      override fun androidLoadPlayStoreCountry() = loadPlayStoreCountry()
+
       @SuppressLint("SourceLockedOrientationActivity")
       @Composable
       override fun androidLockPortraitOrientation() {

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/platform/AppCommon.kt

@@ -1,5 +1,7 @@
 package chat.simplex.common.platform
 
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.mutableStateOf
 import chat.simplex.common.BuildConfigCommon
 import chat.simplex.common.model.*
 import chat.simplex.common.ui.theme.DefaultTheme
@@ -30,6 +32,9 @@ else
 
 val databaseBackend: String = if (appPlatform == AppPlatform.ANDROID) "sqlite" else BuildConfigCommon.DATABASE_BACKEND
 
+// Country of the Google Play account, only set in the google flavor of the Android app
+val androidPlayStoreCountry: MutableState<String?> = mutableStateOf(null)
+
 class FifoQueue<E>(private var capacity: Int) : LinkedList<E>() {
   override fun add(element: E): Boolean {
     if (size > capacity) removeFirstOrNull()

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/platform/Platform.kt

@@ -29,6 +29,8 @@ interface PlatformInterface {
   fun androidRestartNetworkObserver() {}
   fun androidCreateActiveCallState(): Closeable = Closeable { }
   fun androidIsXiaomiDevice(): Boolean = false
+  // Requests the Google Play account country into [androidPlayStoreCountry]
+  fun androidLoadPlayStoreCountry() {}
   val androidApiLevel: Int? get() = null
   // The build distributed via Google Play, which has to follow its policies
   val androidIsPlayStoreBuild: Boolean get() = false