Amazon IAP support added

README_AMAZON.md

@@ -0,0 +1,47 @@
+Amazon IAP Support
+------------------
+The guide assumes that `react-native-iap` is implemented in your app and it works with Google Play with no issues.
+Here are the additional steps to add Amazon IAP support.
+- Add In-App Items for your app:
+  1. Create "In-App Items" using Amazon Developer portal for your app. Amazon put up detailed instructions at https://developer.amazon.com/docs/in-app-purchasing/iap-create-and-submit-iap-items.html
+  2. Add new SKU strings to your `RNIap.getProducts` or `RNIap.getSubscriptions` calls
+
+- App configuration
+  1. The current version of Amazon IAP SDK does not play well with R8 optimization. (https://developer.amazon.com/docs/in-app-purchasing/iap-obfuscate-the-code.html).
+  Add the code below in `android/app/proguard-rules.pro`
+  ```
+  -dontwarn com.amazon.**
+  -keep class com.amazon.** {*;}
+  -keepattributes *Annotation*
+  ```
+
+  2. Update AndroidManifest.xml to add the following:
+  ```
+  <application>
+  ...
+    <receiver android:name = "com.amazon.device.iap.ResponseReceiver"
+        android:permission = "com.amazon.inapp.purchasing.Permission.NOTIFY" >
+      <intent-filter>
+        <action android:name = "com.amazon.inapp.purchasing.NOTIFY" />
+      </intent-filter>
+    </receiver>
+  ...
+  </application>
+  ```
+
+Testing in development
+----------------------
+The `react-native-iap` checks the install source of the app and determines the usage of Amazon IAP API based on that.
+The development environment does not set the install source, the default is to use Google Play as a fallback in this case.
+If the fallback needs to be changed to use Amazon Appstore while testing, the following code snippet needed just before calling `RNIap.initConnection` for the first time in the app:
+```
+if (__DEV__) {
+  RNIap.setFallbackInstallSourceAndroid(RNIap.InstallSourceAndroid.AMAZON);
+}
+RNIap.initConnection(...)
+```
+Amazon offers the `App Tester` tool to make in-app purchases testing easier. More information can be found at https://developer.amazon.com/docs/in-app-purchasing/iap-app-tester-user-guide.html
+
+Server Validation
+-----------------
+Amazon IAP API supports validation of in-app purchases on a remote server side. More information is available at https://developer.amazon.com/docs/in-app-purchasing/iap-rvs-for-android-apps.html

android/build.gradle

@@ -55,6 +55,8 @@ repositories {
 dependencies {
   implementation 'com.facebook.react:react-native:+'
   implementation 'com.android.billingclient:billing:3.0.0'
+  implementation fileTree(dir: 'libs', include: ['*.jar'])
+  // implementation files('libs/in-app-purchasing-2.0.76.jar')
   def supportLibVersion = safeExtGet('supportLibVersion', safeExtGet('supportVersion', null))
   def androidXVersion = safeExtGet('androidXVersion', null)
   if (supportLibVersion && androidXVersion == null) {

android/src/main/java/com/dooboolab/RNIap/DoobooUtils.java

@@ -3,6 +3,8 @@
 import android.util.Log;
 
 import com.android.billingclient.api.BillingClient;
+import android.content.Context;
+import android.content.pm.PackageManager;
 import com.facebook.react.bridge.ObjectAlreadyConsumedException;
 import com.facebook.react.bridge.Promise;
 import com.facebook.react.bridge.ReadableArray;
@@ -36,6 +38,10 @@ public class DoobooUtils {
   public static final String E_DEVELOPER_ERROR = "E_DEVELOPER_ERROR";
   public static final String E_BILLING_RESPONSE_JSON_PARSE_ERROR = "E_BILLING_RESPONSE_JSON_PARSE_ERROR";
 
+  public static final String APPSTORE_UNKNOWN = "UNKNOWN";
+  public static final String APPSTORE_GOOGLE = "GOOGLE_PLAY";
+  public static final String APPSTORE_AMAZON = "AMAZON";
+
   private HashMap<String, ArrayList<Promise>> promises = new HashMap<>();
   private static DoobooUtils instance = new DoobooUtils();
 
@@ -263,4 +269,21 @@ public JSONArray convertArrayToJson(ReadableArray readableArray) throws JSONExce
     }
     return array;
   }
+
+  public final String getInstallSource(Context context) {
+    Context appContext = context.getApplicationContext();
+    PackageManager pkgManager = appContext.getPackageManager();
+    String installerPackageName = pkgManager.getInstallerPackageName(appContext.getPackageName());
+
+    if (installerPackageName == null) {
+      return APPSTORE_UNKNOWN;
+    } else if ("com.android.vending".equals(installerPackageName)) {
+      return APPSTORE_GOOGLE;
+    } else if (installerPackageName.startsWith("com.amazon.")) {
+      return APPSTORE_AMAZON;
+    } else {
+      Log.d(TAG, "Unknown installer source: " + installerPackageName);
+    }
+    return APPSTORE_UNKNOWN;
+  }
 }