method to retrieve pending transactions (#663)

* added exported method getPendingTransactions
* exposing requestPendingPurchasesIOS
* Update README.md
* added typings for requestPendingPurchasesIOS
* Update index.js
* typings for getPendingPurchasesIOS

Author: emilioicai

README.md

@@ -116,6 +116,7 @@ _*deprecated_<br>~~`buySubscription(sku: string)`~~<ul><li>sku: subscription ID/
 `clearTransactionIOS()` | `void`            | **iOS only**<br>Clear up the unfinished transanction which sometimes causes problem.<br>Read more in below README.
 `clearProductsIOS()`    | `void`            | **iOS only**<br>Clear all products and subscriptions.<br>Read more in below README.
 `requestReceiptIOS()`   | `Promise<string>` | **iOS only**<br>Get the current receipt.
+`requestPendingPurchasesIOS()` | `Promise<ProductPurchase[]>` | **IOS only**<br>Gets all the transactions which are pending to be finished.
 `validateReceiptIos(body: Object, devMode: boolean)`<ul><li>body: receiptBody</li><li>devMode: isTest</li></ul> | `Object\|boolean` | **iOS only**<br>Validate receipt.
 `endConnectionAndroid()`   | `Promise<void>` | **Android only**<br>End billing connection.
 `consumeAllItemsAndroid()` | `Promise<void>` | **Android only**<br>Consume all items so they are able to buy again.
@@ -126,6 +127,7 @@ _*deprecated_<br>~~`buySubscription(sku: string, prevSku?: string, mode?: number
 `requestSubscription(sku: string, prevSku?: string, mode?: number)`<ul><li>sku: subscription ID/sku</li><li>prevSku: old subscription ID/sku (optional)</li><li>mode: proration mode (optional)</li></ul>                  | `Promise<string>`   | **Android only**<br>Create (buy) a subscription to a sku.<br>For upgrading/downgrading subscription on Android pass the second parameter with current subscription ID, on iOS this is handled automatically by store.<br>You can also optionally pass in a proration mode integer for upgrading/downgrading subscriptions on Android
 `validateReceiptAndroid(bundleId: string, productId: string, productToken: string, accessToken: string)`<br><ul><li>bundleId: the packageName</li><li>productId: productId</li><li>productToken: productToken</li><li>accessToken: accessToken</li><li>isSubscription: isSubscription</li></ul> | `Object\|boolean` | **Android only**<br>Validate receipt.
 
+
 </details>
 
 Npm Module

index.d.ts

@@ -269,3 +269,10 @@ export function purchaseErrorListener(fn: Function) : EmitterSubscription;
  * @returns {Promise<string>}
  */
 export function requestReceiptIOS(): Promise<string>;
+
+/**
+ * Request all the pending transactions (IOS only)
+ * @returns {Promise<ProductPurchase[]>}
+ */
+export function getPendingPurchasesIOS(): Promise<ProductPurchase[]>;
+

index.js

@@ -480,6 +480,17 @@ export const requestReceiptIOS = () => {
   }
 };
 
+/**
+ * Get the pending purchases in IOS.
+ * @returns {Promise<ProductPurchase[]>}
+ */
+export const getPendingPurchasesIOS = () => {
+  if (Platform.OS === 'ios') {
+    checkNativeiOSAvailable();
+    return RNIapIos.getPendingTransactions();
+  }
+};
+
 /**
  * deprecated codes
  */
@@ -521,6 +532,7 @@ export default {
   getSubscriptions,
   getPurchaseHistory,
   getAvailablePurchases,
+  getPendingPurchasesIOS,
   consumeAllItemsAndroid,
   buySubscription,
   buyProduct,

ios/RNIapIos.m

@@ -318,6 +318,32 @@ - (BOOL)shouldAddStorePayment:(SKPayment *)payment forProduct:(SKProduct *)produ
     [self finishTransactionWithIdentifier:transactionIdentifier];
 }
 
+RCT_EXPORT_METHOD(getPendingTransactions:(RCTPromiseResolveBlock)resolve
+                  reject:(RCTPromiseRejectBlock)reject) {
+    [self requestReceiptDataWithBlock:^(NSData *receiptData, NSError *error) {
+        if (receiptData == nil) {
+            resolve(nil);
+        }
+        else {
+            NSArray<SKPaymentTransaction *> *transactions = [[SKPaymentQueue defaultQueue] transactions];
+            NSMutableArray *output = [NSMutableArray array];
+            
+            for (SKPaymentTransaction *item in transactions) {
+                NSMutableDictionary *purchase = [NSMutableDictionary dictionaryWithObjectsAndKeys:
+                                                 @(item.transactionDate.timeIntervalSince1970 * 1000), @"transactionDate",
+                                                 item.transactionIdentifier, @"transactionId",
+                                                 item.payment.productIdentifier, @"productId",
+                                                 [receiptData base64EncodedStringWithOptions:0], @"transactionReceipt",
+                                                 nil
+                                                 ];
+                [output addObject:purchase];
+            }
+            
+            resolve(output);
+        }
+    }];
+}
+
 #pragma mark ===== StoreKit Delegate
 
 -(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {