Added support to download an already-purchased APP. No purchase flow yet...

src/main/java/com/akdeniz/googleplaycrawler/GooglePlayAPI.java

@@ -72,6 +72,7 @@ public class GooglePlayAPI {
     private static final String REVIEWS_URL = FDFE_URL + "rev";
     private static final String UPLOADDEVICECONFIG_URL = FDFE_URL + "uploadDeviceConfig";
     private static final String RECOMMENDATIONS_URL = FDFE_URL + "rec";
+	private static final String DELIVERY_URL = FDFE_URL + "delivery";
 
     private static final String ACCOUNT_TYPE_HOSTED_OR_GOOGLE = "HOSTED_OR_GOOGLE";
 
@@ -310,11 +311,24 @@ public InputStream download(String packageName, int versionCode, int offerType)
 	AndroidAppDeliveryData appDeliveryData = buyResponse.getPurchaseStatusResponse().getAppDeliveryData();
 
 	String downloadUrl = appDeliveryData.getDownloadUrl();
-	HttpCookie downloadAuthCookie = appDeliveryData.getDownloadAuthCookie(0);
+	try {
+		HttpCookie downloadAuthCookie = appDeliveryData.getDownloadAuthCookie(0);
+		return executeDownload(downloadUrl, downloadAuthCookie.getName() + "=" + downloadAuthCookie.getValue());
+	} catch (Exception e) {
+		throw new IOException(e.getMessage());
+	}
+    }
 
-	return executeDownload(downloadUrl, downloadAuthCookie.getName() + "=" + downloadAuthCookie.getValue());
+	public InputStream delivery (String packageName, int versionCode, int offerType) throws IOException {
+		ResponseWrapper responseWrapper = executeGETRequest(DELIVERY_URL, new String[][] { { "ot", String.valueOf(offerType) },
+				{ "doc", packageName }, { "vc", String.valueOf(versionCode) }, });
 
-    }
+		AndroidAppDeliveryData appDeliveryData = responseWrapper.getPayload().getDeliveryResponse().getAppDeliveryData();
+		String downloadUrl = appDeliveryData.getDownloadUrl();
+		HttpCookie downloadAuthCookie = appDeliveryData.getDownloadAuthCookie(0);
+
+		return executeDownload(downloadUrl, downloadAuthCookie.getName() + "=" + downloadAuthCookie.getValue());
+	}
 
     /**
      * Posts given check-in request content and returns

src/main/java/com/akdeniz/googleplaycrawler/cli/googleplay.java

@@ -581,15 +581,17 @@ private void download(String packageName) throws IOException {
 	int offerType = offer.getOfferType();
 	boolean checkoutRequired = offer.getCheckoutFlowRequired();
 
+	System.out.println("Downloading..." + appDetails.getPackageName() + " : " + installationSize + " bytes");
+	InputStream downloadStream;
+
 	// paid application...ignore
 	if (checkoutRequired) {
-	    System.out.println("Checkout required! Ignoring.." + appDetails.getPackageName());
-	    return;
+	    System.out.println("Checkout required! Assuming you have already purchased it, use the delivery flow for " + appDetails.getPackageName());
+		downloadStream = service.delivery(appDetails.getPackageName(), versionCode, offerType);
+	} else {
+	    downloadStream = service.download(appDetails.getPackageName(), versionCode, offerType);
 	}
 
-	System.out.println("Downloading..." + appDetails.getPackageName() + " : " + installationSize + " bytes");
-	InputStream downloadStream = service.download(appDetails.getPackageName(), versionCode, offerType);
-
 	FileOutputStream outputStream = new FileOutputStream(appDetails.getPackageName() + ".apk");
 
 	byte buffer[] = new byte[1024];

src/main/protobuf/GooglePlay.proto

@@ -156,6 +156,11 @@ message BuyResponse {
   optional string purchaseCookie = 46;
   optional Challenge challenge = 49;
 }
+
+message DeliveryResponse {
+  optional AndroidAppDeliveryData appDeliveryData = 2;
+}
+
 message Challenge {
   optional AddressChallenge addressChallenge = 1;
   optional AuthenticationChallenge authenticationChallenge = 2;
@@ -757,6 +762,7 @@ message Payload {
   optional BulkDetailsResponse bulkDetailsResponse = 19;
   optional UploadDeviceConfigResponse uploadDeviceConfigResponse = 25;
   optional AndroidCheckinResponse androidCheckinResponse = 26;
+  optional DeliveryResponse deliveryResponse = 21;
 }
 message PreFetch {
   optional string url = 1;