Add more api calls for billing integration.

app/src/main/java/org/thoughtcrime/securesms/billing/GooglePlayBillingApi.kt

@@ -5,12 +5,22 @@
 
 package org.thoughtcrime.securesms.billing
 
+import android.app.Activity
+
 /**
  * Variant interface for the BillingApi.
  */
 interface GooglePlayBillingApi {
   fun isApiAvailable(): Boolean = false
-  suspend fun queryProducts() {}
+  suspend fun queryProducts() = Unit
+
+  /**
+   * Queries the user's current purchases. This enqueues a check and will
+   * propagate it to the normal callbacks in the api.
+   */
+  suspend fun queryPurchases() = Unit
+
+  suspend fun launchBillingFlow(activity: Activity) = Unit
 
   /**
    * Empty implementation, to be used when play services are available but

app/src/play/java/org/thoughtcrime/securesms/billing/GooglePlayBillingFactory.kt

@@ -1,7 +1,10 @@
 package org.thoughtcrime.securesms.billing
 
+import android.app.Activity
 import android.content.Context
+import com.android.billingclient.api.BillingClient.BillingResponseCode
 import com.android.billingclient.api.ProductDetailsResult
+import com.android.billingclient.api.PurchasesUpdatedListener
 import org.signal.billing.BillingApi
 import org.signal.core.util.logging.Log
 import org.thoughtcrime.securesms.util.RemoteConfig
@@ -29,7 +32,25 @@ private class GooglePlayBillingApiImpl(context: Context) : GooglePlayBillingApi
     val TAG = Log.tag(GooglePlayBillingApiImpl::class)
   }
 
-  private val billingApi: BillingApi = BillingApi.getOrCreate(context)
+  private val purchasesUpdatedListener = PurchasesUpdatedListener { billingResult, purchases ->
+    when {
+      billingResult.responseCode == BillingResponseCode.OK && purchases != null -> {
+        Log.d(TAG, "purchasesUpdatedListener: ${purchases.size} purchases.")
+        purchases.forEach {
+          // Handle purchases.
+        }
+      }
+      billingResult.responseCode == BillingResponseCode.USER_CANCELED -> {
+        // Handle user cancelled
+        Log.d(TAG, "purchasesUpdatedListener: User cancelled.")
+      }
+      else -> {
+        Log.d(TAG, "purchasesUpdatedListener: No purchases.")
+      }
+    }
+  }
+
+  private val billingApi: BillingApi = BillingApi.getOrCreate(context, purchasesUpdatedListener)
 
   override fun isApiAvailable(): Boolean = billingApi.areSubscriptionsSupported()
 
@@ -38,4 +59,15 @@ private class GooglePlayBillingApiImpl(context: Context) : GooglePlayBillingApi
 
     Log.d(TAG, "queryProducts: ${products.billingResult.responseCode}, ${products.billingResult.debugMessage}")
   }
+
+  override suspend fun queryPurchases() {
+    Log.d(TAG, "queryPurchases")
+
+    val purchaseResult = billingApi.queryPurchases()
+    purchasesUpdatedListener.onPurchasesUpdated(purchaseResult.billingResult, purchaseResult.purchasesList)
+  }
+
+  override suspend fun launchBillingFlow(activity: Activity) {
+    billingApi.launchBillingFlow(activity)
+  }
 }