org.kontalk.billing.GoogleBillingService.java Source code

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Here is the source code for org.kontalk.billing.GoogleBillingService.java

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/* Copyright (c) 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kontalk.billing;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.content.ServiceConnection;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.text.TextUtils;
import android.util.Log;

import com.android.vending.billing.IInAppBillingService;

import org.json.JSONException;

import java.util.ArrayList;
import java.util.List;

/**
 * Provides convenience methods for in-app billing. You can create one instance of this
 * class for your application and use it to process in-app billing operations.
 * It provides synchronous (blocking) and asynchronous (non-blocking) methods for
 * many common in-app billing operations, as well as automatic signature
 * verification.
 *
 * After instantiating, you must perform setup in order to start using the object.
 * To perform setup, call the {@link #startSetup} method and provide a listener;
 * that listener will be notified when setup is complete, after which (and not before)
 * you may call other methods.
 *
 * After setup is complete, you will typically want to request an inventory of owned
 * items and subscriptions. See {@link #queryInventory}, {@link #queryInventoryAsync}
 * and related methods.
 *
 * When you are done with this object, don't forget to call {@link #dispose}
 * to ensure proper cleanup. This object holds a binding to the in-app billing
 * service, which will leak unless you dispose of it correctly. If you created
 * the object on an Activity's onCreate method, then the recommended
 * place to dispose of it is the Activity's onDestroy method.
 *
 * A note about threading: When using this object from a background thread, you may
 * call the blocking versions of methods; when using from a UI thread, call
 * only the asynchronous versions and handle the results via callbacks.
 * Also, notice that you can only call one asynchronous operation at a time;
 * attempting to start a second asynchronous operation while the first one
 * has not yet completed will result in an exception being thrown.
 *
 * @author Bruno Oliveira (Google)
 *
 */
public class GoogleBillingService implements IBillingService {
    // Is debug logging enabled?
    boolean mDebugLog = false;
    String mDebugTag = "IabHelper";

    // Is setup done?
    boolean mSetupDone = false;

    // Has this object been disposed of? (If so, we should ignore callbacks, etc)
    boolean mDisposed = false;

    // Are subscriptions supported?
    boolean mSubscriptionsSupported = false;

    // Is an asynchronous operation in progress?
    // (only one at a time can be in progress)
    boolean mAsyncInProgress = false;

    // (for logging/debugging)
    // if mAsyncInProgress == true, what asynchronous operation is in progress?
    String mAsyncOperation = "";

    // Context we were passed during initialization
    Context mContext;

    // Connection to the service
    IInAppBillingService mService;
    ServiceConnection mServiceConn;

    // The request code used to launch purchase flow
    int mRequestCode;

    // The item type of the current purchase flow
    String mPurchasingItemType;

    // Billing response codes
    public static final int BILLING_RESPONSE_RESULT_OK = 0;
    public static final int BILLING_RESPONSE_RESULT_USER_CANCELED = 1;
    public static final int BILLING_RESPONSE_RESULT_BILLING_UNAVAILABLE = 3;
    public static final int BILLING_RESPONSE_RESULT_ITEM_UNAVAILABLE = 4;
    public static final int BILLING_RESPONSE_RESULT_DEVELOPER_ERROR = 5;
    public static final int BILLING_RESPONSE_RESULT_ERROR = 6;
    public static final int BILLING_RESPONSE_RESULT_ITEM_ALREADY_OWNED = 7;
    public static final int BILLING_RESPONSE_RESULT_ITEM_NOT_OWNED = 8;

    // IAB Helper error codes
    public static final int IABHELPER_ERROR_BASE = -1000;
    public static final int IABHELPER_REMOTE_EXCEPTION = -1001;
    public static final int IABHELPER_BAD_RESPONSE = -1002;
    public static final int IABHELPER_VERIFICATION_FAILED = -1003;
    public static final int IABHELPER_SEND_INTENT_FAILED = -1004;
    public static final int IABHELPER_USER_CANCELLED = -1005;
    public static final int IABHELPER_UNKNOWN_PURCHASE_RESPONSE = -1006;
    public static final int IABHELPER_MISSING_TOKEN = -1007;
    public static final int IABHELPER_UNKNOWN_ERROR = -1008;
    public static final int IABHELPER_SUBSCRIPTIONS_NOT_AVAILABLE = -1009;
    public static final int IABHELPER_INVALID_CONSUMPTION = -1010;

    // Keys for the responses from InAppBillingService
    public static final String RESPONSE_CODE = "RESPONSE_CODE";
    public static final String RESPONSE_GET_SKU_DETAILS_LIST = "DETAILS_LIST";
    public static final String RESPONSE_BUY_INTENT = "BUY_INTENT";
    public static final String RESPONSE_INAPP_PURCHASE_DATA = "INAPP_PURCHASE_DATA";
    public static final String RESPONSE_INAPP_SIGNATURE = "INAPP_DATA_SIGNATURE";
    public static final String RESPONSE_INAPP_ITEM_LIST = "INAPP_PURCHASE_ITEM_LIST";
    public static final String RESPONSE_INAPP_PURCHASE_DATA_LIST = "INAPP_PURCHASE_DATA_LIST";
    public static final String RESPONSE_INAPP_SIGNATURE_LIST = "INAPP_DATA_SIGNATURE_LIST";
    public static final String INAPP_CONTINUATION_TOKEN = "INAPP_CONTINUATION_TOKEN";

    // Item types
    public static final String ITEM_TYPE_INAPP = "inapp";
    public static final String ITEM_TYPE_SUBS = "subs";

    // some fields on the getSkuDetails response bundle
    public static final String GET_SKU_DETAILS_ITEM_LIST = "ITEM_ID_LIST";
    public static final String GET_SKU_DETAILS_ITEM_TYPE_LIST = "ITEM_TYPE_LIST";

    /**
     * Creates an instance. After creation, it will not yet be ready to use. You must perform
     * setup by calling {@link #startSetup} and wait for setup to complete. This constructor does not
     * block and is safe to call from a UI thread.
     *
     * @param ctx Your application or Activity context. Needed to bind to the in-app billing service.
     */
    public GoogleBillingService(Context ctx) {
        mContext = ctx.getApplicationContext();
        logDebug("IAB helper created.");
    }

    /**
     * Enables or disable debug logging through LogCat.
     */
    public void enableDebugLogging(boolean enable, String tag) {
        checkNotDisposed();
        mDebugLog = enable;
        mDebugTag = tag;
    }

    public void enableDebugLogging(boolean enable) {
        checkNotDisposed();
        mDebugLog = enable;
    }

    /**
     * Starts the setup process. This will start up the setup process asynchronously.
     * You will be notified through the listener when the setup process is complete.
     * This method is safe to call from a UI thread.
     *
     * @param listener The listener to notify when the setup process is complete.
     */
    public void startSetup(final OnBillingSetupFinishedListener listener) {
        // If already set up, can't do it again.
        checkNotDisposed();
        if (mSetupDone)
            throw new IllegalStateException("IAB helper is already set up.");

        // Connection to IAB service
        logDebug("Starting in-app billing setup.");
        mServiceConn = new ServiceConnection() {
            @Override
            public void onServiceDisconnected(ComponentName name) {
                logDebug("Billing service disconnected.");
                mService = null;
            }

            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                if (mDisposed)
                    return;
                logDebug("Billing service connected.");
                mService = IInAppBillingService.Stub.asInterface(service);
                String packageName = mContext.getPackageName();
                try {
                    logDebug("Checking for in-app billing 3 support.");

                    // check for in-app billing v3 support
                    int response = mService.isBillingSupported(3, packageName, ITEM_TYPE_INAPP);
                    if (response != BILLING_RESPONSE_RESULT_OK) {
                        if (listener != null)
                            listener.onSetupFinished(
                                    new BillingResult(response, "Error checking for billing v3 support."));

                        // if in-app purchases aren't supported, neither are subscriptions.
                        mSubscriptionsSupported = false;
                        return;
                    }
                    logDebug("In-app billing version 3 supported for " + packageName);

                    // check for v3 subscriptions support
                    response = mService.isBillingSupported(3, packageName, ITEM_TYPE_SUBS);
                    if (response == BILLING_RESPONSE_RESULT_OK) {
                        logDebug("Subscriptions AVAILABLE.");
                        mSubscriptionsSupported = true;
                    } else {
                        logDebug("Subscriptions NOT AVAILABLE. Response: " + response);
                    }

                    mSetupDone = true;
                } catch (RemoteException e) {
                    if (listener != null) {
                        listener.onSetupFinished(new BillingResult(IABHELPER_REMOTE_EXCEPTION,
                                "RemoteException while setting up in-app billing."));
                    }
                    e.printStackTrace();
                    return;
                }

                if (listener != null) {
                    listener.onSetupFinished(new BillingResult(BILLING_RESPONSE_RESULT_OK, "Setup successful."));
                }
            }
        };

        Intent serviceIntent = new Intent("com.android.vending.billing.InAppBillingService.BIND");
        serviceIntent.setPackage("com.android.vending");

        List<ResolveInfo> services = mContext.getPackageManager().queryIntentServices(serviceIntent, 0);
        if (services != null && !services.isEmpty()) {
            // service available to handle that Intent
            mContext.bindService(serviceIntent, mServiceConn, Context.BIND_AUTO_CREATE);
        } else {
            // no service available to handle that Intent
            if (listener != null) {
                listener.onSetupFinished(new BillingResult(BILLING_RESPONSE_RESULT_BILLING_UNAVAILABLE,
                        "Billing service unavailable on device."));
            }
        }
    }

    /**
     * Dispose of object, releasing resources. It's very important to call this
     * method when you are done with this object. It will release any resources
     * used by it such as service connections. Naturally, once the object is
     * disposed of, it can't be used again.
     */
    public void dispose() {
        logDebug("Disposing.");
        mSetupDone = false;
        if (mServiceConn != null) {
            logDebug("Unbinding from service.");
            if (mContext != null)
                mContext.unbindService(mServiceConn);
        }
        mDisposed = true;
        mContext = null;
        mServiceConn = null;
        mService = null;
        mPurchaseListener = null;
    }

    private void checkNotDisposed() {
        if (mDisposed)
            throw new IllegalStateException("IabHelper was disposed of, so it cannot be used.");
    }

    /** Returns whether subscriptions are supported. */
    public boolean subscriptionsSupported() {
        checkNotDisposed();
        return mSubscriptionsSupported;
    }

    // The listener registered on launchPurchaseFlow, which we have to call back when
    // the purchase finishes
    OnPurchaseFinishedListener mPurchaseListener;

    public void launchPurchaseFlow(Activity act, String sku, int requestCode, OnPurchaseFinishedListener listener) {
        launchPurchaseFlow(act, sku, requestCode, listener, "");
    }

    public void launchPurchaseFlow(Activity act, String sku, int requestCode, OnPurchaseFinishedListener listener,
            String extraData) {
        launchPurchaseFlow(act, sku, ITEM_TYPE_INAPP, requestCode, listener, extraData);
    }

    public void launchSubscriptionPurchaseFlow(Activity act, String sku, int requestCode,
            OnPurchaseFinishedListener listener) {
        launchSubscriptionPurchaseFlow(act, sku, requestCode, listener, "");
    }

    public void launchSubscriptionPurchaseFlow(Activity act, String sku, int requestCode,
            OnPurchaseFinishedListener listener, String extraData) {
        launchPurchaseFlow(act, sku, ITEM_TYPE_SUBS, requestCode, listener, extraData);
    }

    /**
     * Initiate the UI flow for an in-app purchase. Call this method to initiate an in-app purchase,
     * which will involve bringing up the Google Play screen. The calling activity will be paused while
     * the user interacts with Google Play, and the result will be delivered via the activity's
     * {@link android.app.Activity#onActivityResult} method, at which point you must call
     * this object's {@link #handleActivityResult} method to continue the purchase flow. This method
     * MUST be called from the UI thread of the Activity.
     *
     * @param act The calling activity.
     * @param sku The sku of the item to purchase.
     * @param itemType indicates if it's a product or a subscription (ITEM_TYPE_INAPP or ITEM_TYPE_SUBS)
     * @param requestCode A request code (to differentiate from other responses --
     *     as in {@link android.app.Activity#startActivityForResult}).
     * @param listener The listener to notify when the purchase process finishes
     * @param extraData Extra data (developer payload), which will be returned with the purchase data
     *     when the purchase completes. This extra data will be permanently bound to that purchase
     *     and will always be returned when the purchase is queried.
     */
    public void launchPurchaseFlow(Activity act, String sku, String itemType, int requestCode,
            OnPurchaseFinishedListener listener, String extraData) {
        checkNotDisposed();
        checkSetupDone("launchPurchaseFlow");
        startAsyncOperation("launchPurchaseFlow");
        BillingResult result;

        if (itemType.equals(ITEM_TYPE_SUBS) && !mSubscriptionsSupported) {
            BillingResult r = new BillingResult(IABHELPER_SUBSCRIPTIONS_NOT_AVAILABLE,
                    "Subscriptions are not available.");
            endAsyncOperation();
            if (listener != null)
                listener.onPurchaseFinished(r, null);
            return;
        }

        try {
            logDebug("Constructing buy intent for " + sku + ", item type: " + itemType);
            Bundle buyIntentBundle = mService.getBuyIntent(3, mContext.getPackageName(), sku, itemType, extraData);
            int response = getResponseCodeFromBundle(buyIntentBundle);
            if (response != BILLING_RESPONSE_RESULT_OK) {
                logError("Unable to buy item, Error response: " + getResponseDesc(response));
                endAsyncOperation();
                result = new BillingResult(response, "Unable to buy item");
                if (listener != null)
                    listener.onPurchaseFinished(result, null);
                return;
            }

            PendingIntent pendingIntent = buyIntentBundle.getParcelable(RESPONSE_BUY_INTENT);
            logDebug("Launching buy intent for " + sku + ". Request code: " + requestCode);
            mRequestCode = requestCode;
            mPurchaseListener = listener;
            mPurchasingItemType = itemType;
            act.startIntentSenderForResult(pendingIntent.getIntentSender(), requestCode, new Intent(),
                    Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(0));
        } catch (SendIntentException e) {
            logError("SendIntentException while launching purchase flow for sku " + sku);
            e.printStackTrace();
            endAsyncOperation();

            result = new BillingResult(IABHELPER_SEND_INTENT_FAILED, "Failed to send intent.");
            if (listener != null)
                listener.onPurchaseFinished(result, null);
        } catch (RemoteException e) {
            logError("RemoteException while launching purchase flow for sku " + sku);
            e.printStackTrace();
            endAsyncOperation();

            result = new BillingResult(IABHELPER_REMOTE_EXCEPTION, "Remote exception while starting purchase flow");
            if (listener != null)
                listener.onPurchaseFinished(result, null);
        }
    }

    /**
     * Handles an activity result that's part of the purchase flow in in-app billing. If you
     * are calling {@link #launchPurchaseFlow}, then you must call this method from your
     * Activity's {@link android.app.Activity@onActivityResult} method. This method
     * MUST be called from the UI thread of the Activity.
     *
     * @param requestCode The requestCode as you received it.
     * @param resultCode The resultCode as you received it.
     * @param data The data (Intent) as you received it.
     * @return Returns true if the result was related to a purchase flow and was handled;
     *     false if the result was not related to a purchase, in which case you should
     *     handle it normally.
     */
    public boolean handleActivityResult(int requestCode, int resultCode, Intent data) {
        BillingResult result;
        if (requestCode != mRequestCode)
            return false;

        checkNotDisposed();
        checkSetupDone("handleActivityResult");

        // end of async purchase operation that started on launchPurchaseFlow
        endAsyncOperation();

        if (data == null) {
            logError("Null data in IAB activity result.");
            result = new BillingResult(IABHELPER_BAD_RESPONSE, "Null data in IAB result");
            if (mPurchaseListener != null)
                mPurchaseListener.onPurchaseFinished(result, null);
            return true;
        }

        int responseCode = getResponseCodeFromIntent(data);
        String purchaseData = data.getStringExtra(RESPONSE_INAPP_PURCHASE_DATA);
        String dataSignature = data.getStringExtra(RESPONSE_INAPP_SIGNATURE);

        if (resultCode == Activity.RESULT_OK && responseCode == BILLING_RESPONSE_RESULT_OK) {
            logDebug("Successful resultcode from purchase activity.");
            logDebug("Purchase data: " + purchaseData);
            logDebug("Data signature: " + dataSignature);
            logDebug("Extras: " + data.getExtras());
            logDebug("Expected item type: " + mPurchasingItemType);

            if (purchaseData == null || dataSignature == null) {
                logError("BUG: either purchaseData or dataSignature is null.");
                logDebug("Extras: " + data.getExtras().toString());
                result = new BillingResult(IABHELPER_UNKNOWN_ERROR,
                        "IAB returned null purchaseData or dataSignature");
                if (mPurchaseListener != null)
                    mPurchaseListener.onPurchaseFinished(result, null);
                return true;
            }

            Purchase purchase = null;
            try {
                purchase = new Purchase(mPurchasingItemType, purchaseData, dataSignature);

                // we don't need purchase verification

                logDebug("Purchase signature successfully verified.");
            } catch (JSONException e) {
                logError("Failed to parse purchase data.");
                e.printStackTrace();
                result = new BillingResult(IABHELPER_BAD_RESPONSE, "Failed to parse purchase data.");
                if (mPurchaseListener != null)
                    mPurchaseListener.onPurchaseFinished(result, null);
                return true;
            }

            if (mPurchaseListener != null) {
                mPurchaseListener.onPurchaseFinished(new BillingResult(BILLING_RESPONSE_RESULT_OK, "Success"),
                        purchase);
            }
        } else if (resultCode == Activity.RESULT_OK) {
            // result code was OK, but in-app billing response was not OK.
            logDebug("Result code was OK but in-app billing response was not OK: " + getResponseDesc(responseCode));
            if (mPurchaseListener != null) {
                result = new BillingResult(responseCode, "Problem purchashing item.");
                mPurchaseListener.onPurchaseFinished(result, null);
            }
        } else if (resultCode == Activity.RESULT_CANCELED) {
            logDebug("Purchase canceled - Response: " + getResponseDesc(responseCode));
            result = new BillingResult(IABHELPER_USER_CANCELLED, "User canceled.");
            if (mPurchaseListener != null)
                mPurchaseListener.onPurchaseFinished(result, null);
        } else {
            logError("Purchase failed. Result code: " + Integer.toString(resultCode) + ". Response: "
                    + getResponseDesc(responseCode));
            result = new BillingResult(IABHELPER_UNKNOWN_PURCHASE_RESPONSE, "Unknown purchase response.");
            if (mPurchaseListener != null)
                mPurchaseListener.onPurchaseFinished(result, null);
        }
        return true;
    }

    public IInventory queryInventory(boolean querySkuDetails, List<String> moreSkus) throws BillingException {
        return queryInventory(querySkuDetails, moreSkus, null);
    }

    /**
     * Queries the inventory. This will query all owned items from the server, as well as
     * information on additional skus, if specified. This method may block or take long to execute.
     * Do not call from a UI thread. For that, use the non-blocking version {@link #queryInventoryAsync}.
     *
     * @param querySkuDetails if true, SKU details (price, description, etc) will be queried as well
     *     as purchase information.
     * @param moreItemSkus additional PRODUCT skus to query information on, regardless of ownership.
     *     Ignored if null or if querySkuDetails is false.
     * @param moreSubsSkus additional SUBSCRIPTIONS skus to query information on, regardless of ownership.
     *     Ignored if null or if querySkuDetails is false.
     * @throws BillingException if a problem occurs while refreshing the inventory.
     */
    public IInventory queryInventory(boolean querySkuDetails, List<String> moreItemSkus, List<String> moreSubsSkus)
            throws BillingException {
        checkNotDisposed();
        checkSetupDone("queryInventory");
        try {
            Inventory inv = new Inventory();
            int r = queryPurchases(inv, ITEM_TYPE_INAPP);
            if (r != BILLING_RESPONSE_RESULT_OK) {
                throw new BillingException(r, "Error refreshing inventory (querying owned items).");
            }

            if (querySkuDetails) {
                r = querySkuDetails(ITEM_TYPE_INAPP, inv, moreItemSkus);
                if (r != BILLING_RESPONSE_RESULT_OK) {
                    throw new BillingException(r, "Error refreshing inventory (querying prices of items).");
                }
            }

            // if subscriptions are supported, then also query for subscriptions
            if (mSubscriptionsSupported) {
                r = queryPurchases(inv, ITEM_TYPE_SUBS);
                if (r != BILLING_RESPONSE_RESULT_OK) {
                    throw new BillingException(r, "Error refreshing inventory (querying owned subscriptions).");
                }

                if (querySkuDetails) {
                    r = querySkuDetails(ITEM_TYPE_SUBS, inv, moreItemSkus);
                    if (r != BILLING_RESPONSE_RESULT_OK) {
                        throw new BillingException(r,
                                "Error refreshing inventory (querying prices of subscriptions).");
                    }
                }
            }

            return inv;
        } catch (RemoteException e) {
            throw new BillingException(IABHELPER_REMOTE_EXCEPTION, "Remote exception while refreshing inventory.",
                    e);
        } catch (JSONException e) {
            throw new BillingException(IABHELPER_BAD_RESPONSE,
                    "Error parsing JSON response while refreshing inventory.", e);
        }
    }

    /**
     * Asynchronous wrapper for inventory query. This will perform an inventory
     * query as described in {@link #queryInventory}, but will do so asynchronously
     * and call back the specified listener upon completion. This method is safe to
     * call from a UI thread.
     *
     * @param querySkuDetails as in {@link #queryInventory}
     * @param moreSkus as in {@link #queryInventory}
     * @param listener The listener to notify when the refresh operation completes.
     */
    public void queryInventoryAsync(final boolean querySkuDetails, final List<String> moreSkus,
            final QueryInventoryFinishedListener listener) {
        final Handler handler = new Handler();
        checkNotDisposed();
        checkSetupDone("queryInventory");
        startAsyncOperation("refresh inventory");
        (new Thread(new Runnable() {
            public void run() {
                BillingResult result = new BillingResult(BILLING_RESPONSE_RESULT_OK,
                        "Inventory refresh successful.");
                IInventory inv = null;
                try {
                    inv = queryInventory(querySkuDetails, moreSkus);
                } catch (BillingException ex) {
                    result = ex.getResult();
                }

                endAsyncOperation();

                final BillingResult result_f = result;
                final IInventory inv_f = inv;
                if (!mDisposed && listener != null) {
                    handler.post(new Runnable() {
                        public void run() {
                            listener.onQueryInventoryFinished(result_f, inv_f);
                        }
                    });
                }
            }
        })).start();
    }

    public void queryInventoryAsync(QueryInventoryFinishedListener listener) {
        queryInventoryAsync(true, null, listener);
    }

    public void queryInventoryAsync(boolean querySkuDetails, QueryInventoryFinishedListener listener) {
        queryInventoryAsync(querySkuDetails, null, listener);
    }

    /**
     * Returns a human-readable description for the given response code.
     *
     * @param code The response code
     * @return A human-readable string explaining the result code.
     *     It also includes the result code numerically.
     */
    public static String getResponseDesc(int code) {
        String[] iab_msgs = ("0:OK/1:User Canceled/2:Unknown/" + "3:Billing Unavailable/4:Item unavailable/"
                + "5:Developer Error/6:Error/7:Item Already Owned/" + "8:Item not owned").split("/");
        String[] iabhelper_msgs = ("0:OK/-1001:Remote exception during initialization/"
                + "-1002:Bad response received/" + "-1003:Purchase signature verification failed/"
                + "-1004:Send intent failed/" + "-1005:User cancelled/" + "-1006:Unknown purchase response/"
                + "-1007:Missing token/" + "-1008:Unknown error/" + "-1009:Subscriptions not available/"
                + "-1010:Invalid consumption attempt").split("/");

        if (code <= IABHELPER_ERROR_BASE) {
            int index = IABHELPER_ERROR_BASE - code;
            if (index >= 0 && index < iabhelper_msgs.length)
                return iabhelper_msgs[index];
            else
                return String.valueOf(code) + ":Unknown IAB Helper Error";
        } else if (code < 0 || code >= iab_msgs.length)
            return String.valueOf(code) + ":Unknown";
        else
            return iab_msgs[code];
    }

    // Checks that setup was done; if not, throws an exception.
    void checkSetupDone(String operation) {
        if (!mSetupDone) {
            logError("Illegal state for operation (" + operation + "): IAB helper is not set up.");
            throw new IllegalStateException("IAB helper is not set up. Can't perform operation: " + operation);
        }
    }

    // Workaround to bug where sometimes response codes come as Long instead of Integer
    int getResponseCodeFromBundle(Bundle b) {
        Object o = b.get(RESPONSE_CODE);
        if (o == null) {
            logDebug("Bundle with null response code, assuming OK (known issue)");
            return BILLING_RESPONSE_RESULT_OK;
        } else if (o instanceof Integer)
            return ((Integer) o).intValue();
        else if (o instanceof Long)
            return (int) ((Long) o).longValue();
        else {
            logError("Unexpected type for bundle response code.");
            logError(o.getClass().getName());
            throw new RuntimeException("Unexpected type for bundle response code: " + o.getClass().getName());
        }
    }

    // Workaround to bug where sometimes response codes come as Long instead of Integer
    int getResponseCodeFromIntent(Intent i) {
        Object o = i.getExtras().get(RESPONSE_CODE);
        if (o == null) {
            logError("Intent with no response code, assuming OK (known issue)");
            return BILLING_RESPONSE_RESULT_OK;
        } else if (o instanceof Integer)
            return ((Integer) o).intValue();
        else if (o instanceof Long)
            return (int) ((Long) o).longValue();
        else {
            logError("Unexpected type for intent response code.");
            logError(o.getClass().getName());
            throw new RuntimeException("Unexpected type for intent response code: " + o.getClass().getName());
        }
    }

    void startAsyncOperation(String operation) {
        if (mAsyncInProgress)
            throw new IllegalStateException("Can't start async operation (" + operation
                    + ") because another async operation(" + mAsyncOperation + ") is in progress.");
        mAsyncOperation = operation;
        mAsyncInProgress = true;
        logDebug("Starting async operation: " + operation);
    }

    public void endAsyncOperation() {
        logDebug("Ending async operation: " + mAsyncOperation);
        mAsyncOperation = "";
        mAsyncInProgress = false;
    }

    int queryPurchases(Inventory inv, String itemType) throws JSONException, RemoteException {
        // Query purchases
        logDebug("Querying owned items, item type: " + itemType);
        logDebug("Package name: " + mContext.getPackageName());
        boolean verificationFailed = false;
        String continueToken = null;

        do {
            logDebug("Calling getPurchases with continuation token: " + continueToken);
            Bundle ownedItems = mService.getPurchases(3, mContext.getPackageName(), itemType, continueToken);

            int response = getResponseCodeFromBundle(ownedItems);
            logDebug("Owned items response: " + String.valueOf(response));
            if (response != BILLING_RESPONSE_RESULT_OK) {
                logDebug("getPurchases() failed: " + getResponseDesc(response));
                return response;
            }
            if (!ownedItems.containsKey(RESPONSE_INAPP_ITEM_LIST)
                    || !ownedItems.containsKey(RESPONSE_INAPP_PURCHASE_DATA_LIST)
                    || !ownedItems.containsKey(RESPONSE_INAPP_SIGNATURE_LIST)) {
                logError("Bundle returned from getPurchases() doesn't contain required fields.");
                return IABHELPER_BAD_RESPONSE;
            }

            ArrayList<String> ownedSkus = ownedItems.getStringArrayList(RESPONSE_INAPP_ITEM_LIST);
            ArrayList<String> purchaseDataList = ownedItems.getStringArrayList(RESPONSE_INAPP_PURCHASE_DATA_LIST);
            ArrayList<String> signatureList = ownedItems.getStringArrayList(RESPONSE_INAPP_SIGNATURE_LIST);

            for (int i = 0; i < purchaseDataList.size(); ++i) {
                String purchaseData = purchaseDataList.get(i);
                String signature = signatureList.get(i);
                String sku = ownedSkus.get(i);

                // we don't need purchase verification
                logDebug("Sku is owned: " + sku);
                Purchase purchase = new Purchase(itemType, purchaseData, signature);

                if (TextUtils.isEmpty(purchase.getToken())) {
                    logWarn("BUG: empty/null token!");
                    logDebug("Purchase data: " + purchaseData);
                }

                // Record ownership and token
                inv.addPurchase(purchase);
            }

            continueToken = ownedItems.getString(INAPP_CONTINUATION_TOKEN);
            logDebug("Continuation token: " + continueToken);
        } while (!TextUtils.isEmpty(continueToken));

        return verificationFailed ? IABHELPER_VERIFICATION_FAILED : BILLING_RESPONSE_RESULT_OK;
    }

    int querySkuDetails(String itemType, Inventory inv, List<String> moreSkus)
            throws RemoteException, JSONException {
        logDebug("Querying SKU details.");
        ArrayList<String> skuList = new ArrayList<String>();
        skuList.addAll(inv.getAllOwnedSkus(itemType));
        if (moreSkus != null) {
            for (String sku : moreSkus) {
                if (!skuList.contains(sku)) {
                    skuList.add(sku);
                }
            }
        }

        if (skuList.size() == 0) {
            logDebug("queryPrices: nothing to do because there are no SKUs.");
            return BILLING_RESPONSE_RESULT_OK;
        }

        Bundle querySkus = new Bundle();
        querySkus.putStringArrayList(GET_SKU_DETAILS_ITEM_LIST, skuList);
        Bundle skuDetails = mService.getSkuDetails(3, mContext.getPackageName(), itemType, querySkus);

        if (!skuDetails.containsKey(RESPONSE_GET_SKU_DETAILS_LIST)) {
            int response = getResponseCodeFromBundle(skuDetails);
            if (response != BILLING_RESPONSE_RESULT_OK) {
                logDebug("getSkuDetails() failed: " + getResponseDesc(response));
                return response;
            } else {
                logError("getSkuDetails() returned a bundle with neither an error nor a detail list.");
                return IABHELPER_BAD_RESPONSE;
            }
        }

        ArrayList<String> responseList = skuDetails.getStringArrayList(RESPONSE_GET_SKU_DETAILS_LIST);

        for (String thisResponse : responseList) {
            ProductDetails d = new ProductDetails(itemType, thisResponse);
            logDebug("Got sku details: " + d);
            inv.addSkuDetails(d);
        }
        return BILLING_RESPONSE_RESULT_OK;
    }

    void logDebug(String msg) {
        if (mDebugLog)
            Log.d(mDebugTag, msg);
    }

    void logError(String msg) {
        Log.e(mDebugTag, "In-app billing error: " + msg);
    }

    void logWarn(String msg) {
        Log.w(mDebugTag, "In-app billing warning: " + msg);
    }
}