* Copyright 2014 Google Inc. All rights reserved.
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.savillians.gradle.androidpublisher;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.repackaged.com.google.common.base.Preconditions;
import com.google.api.client.repackaged.com.google.common.base.Strings;
import com.google.api.client.util.store.DataStoreFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.androidpublisher.AndroidPublisher;
import com.google.api.services.androidpublisher.AndroidPublisherScopes;

import java.io.File;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collections;

import javax.annotation.Nullable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

 * Helper class to initialize the publisher APIs client library.
 * <p>
 * Before making any calls to the API through the client library you need to
 * call the {@link AndroidPublisherHelper#init(String, String, File)} method. This will run
 * all precondition checks for for client id and secret setup properly in
 * resources/client_secrets.json and authorize this client against the API.
 * </p>
public class AndroidPublisherHelper {

    private static final Log log = LogFactory.getLog(AndroidPublisherHelper.class);

    static final String MIME_TYPE_APK = "application/vnd.android.package-archive";

     * Path to the client secrets file (only used for Installed Application
     * auth).
    private static final String RESOURCES_CLIENT_SECRETS_JSON = "/resources/client_secrets.json";

     * Directory to store user credentials (only for Installed Application
     * auth).
    private static final String DATA_STORE_SYSTEM_PROPERTY = "user.home";
    private static final String DATA_STORE_FILE = ".store/android_publisher_api";
    private static final File DATA_STORE_DIR =
            new File(System.getProperty(DATA_STORE_SYSTEM_PROPERTY), DATA_STORE_FILE);

    /** Global instance of the JSON factory. */
    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

    /** Global instance of the HTTP transport. */
    private static HttpTransport HTTP_TRANSPORT;

    /** Installed application user ID. */
    private static final String INST_APP_USER_ID = "user";

     * Global instance of the {@link DataStoreFactory}. The best practice is to
     * make it a single globally shared instance across your application.
    private static FileDataStoreFactory dataStoreFactory;

    private static Credential authorizeWithServiceAccount(String serviceAccountEmail,
														  File serviceAccountKeyFile)
            throws GeneralSecurityException, IOException {
        log.info(String.format("Authorizing using Service Account: %s", serviceAccountEmail));

        // Build service account credential.
		log.info("Using service key file: "+serviceAccountKeyFile.getAbsolutePath());
        GoogleCredential credential = new GoogleCredential.Builder()
        return credential;

     * Ensure the client secrets file has been filled out.
     * @param clientSecrets the GoogleClientSecrets containing data from the
     *            file
    private static void checkClientSecretsFile(GoogleClientSecrets clientSecrets) {
        if (clientSecrets.getDetails().getClientId().startsWith("[[INSERT")
                || clientSecrets.getDetails().getClientSecret().startsWith("[[INSERT")) {
            log.error("Enter Client ID and Secret from "
                    + "APIs console into resources/client_secrets.json.");

     * Performs all necessary setup steps for running requests against the API.
     * @param applicationName the name of the application: com.example.app
     * @param serviceAccountEmail the Service Account Email (empty if using
     *            installed application)
     * @return the {@Link AndroidPublisher} service
     * @throws GeneralSecurityException
     * @throws IOException
    protected static AndroidPublisher init(String applicationName,
            String serviceAccountEmail, File serviceAccountKeyFile)
				throws IOException, GeneralSecurityException {
                "Application name cannot be null or empty!");

        // Authorization.
        Credential credential = authorizeWithServiceAccount(serviceAccountEmail, serviceAccountKeyFile);

        // Set up and return API client.
        return new AndroidPublisher.Builder(
                HTTP_TRANSPORT, JSON_FACTORY, credential).setApplicationName(applicationName)

    private static void newTrustedTransport() throws GeneralSecurityException,
            IOException {
        if (null == HTTP_TRANSPORT) {
            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();