Add notification permission prompting to IAMs

Add support for notification permission prompting to In-App Messaging.

Author: jkasten2

OneSignalSDK/onesignal/src/main/java/com/onesignal/OSInAppMessageAction.java

@@ -10,8 +10,6 @@
 import java.util.ArrayList;
 import java.util.List;
 
-import static com.onesignal.OSInAppMessageLocationPrompt.LOCATION_PROMPT_KEY;
-
 public class OSInAppMessageAction {
 
     private static final String ID = "id";
@@ -117,8 +115,14 @@ private void parseOutcomes(JSONObject json) throws JSONException {
     private void parsePrompts(JSONObject json) throws JSONException {
         JSONArray promptsJsonArray = json.getJSONArray(PROMPTS);
         for (int i = 0; i < promptsJsonArray.length(); i++) {
-            if (promptsJsonArray.get(i).equals(LOCATION_PROMPT_KEY) ) {
-                prompts.add(new OSInAppMessageLocationPrompt());
+            String promptType = promptsJsonArray.getString(i);
+            switch (promptType) {
+                case OSInAppMessagePushPrompt.PUSH_PROMPT_KEY:
+                    prompts.add(new OSInAppMessagePushPrompt());
+                    break;
+                case OSInAppMessageLocationPrompt.LOCATION_PROMPT_KEY:
+                    prompts.add(new OSInAppMessageLocationPrompt());
+                    break;
             }
         }
     }

OneSignalSDK/onesignal/src/main/java/com/onesignal/OSInAppMessagePushPrompt.java

@@ -0,0 +1,25 @@
+package com.onesignal;
+
+public class OSInAppMessagePushPrompt extends OSInAppMessagePrompt {
+
+    static final String PUSH_PROMPT_KEY = "push";
+
+    @Override
+    void handlePrompt(OneSignal.OSPromptActionCompletionCallback callback) {
+        OneSignal.promptForPushNotifications(
+            true,
+            accepted -> {
+                OneSignal.PromptActionResult result = accepted ?
+                    OneSignal.PromptActionResult.PERMISSION_GRANTED :
+                    OneSignal.PromptActionResult.PERMISSION_DENIED;
+                callback.onCompleted(result);
+            }
+        );
+    }
+
+    @Override
+    String getPromptKey() {
+        return PUSH_PROMPT_KEY;
+    }
+
+}