StorageSample.java

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/*
 * Copyright (c) 2014 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.
 */

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.java6.auth.oauth2.VerificationCodeReceiver;
import com.google.api.client.googleapis.extensions.java6.auth.oauth2.GooglePromptReceiver;
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.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.util.store.DataStoreFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.storage.Storage;
import com.google.api.services.storage.StorageScopes;
import com.google.api.services.storage.model.Bucket;
import com.google.api.services.storage.model.StorageObject;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Main class for the Cloud Storage API command line sample. Demonstrates how to
 * make an authenticated API call using OAuth 2 helper classes.
 */
public class StorageSample {

	/**
	 * Be sure to specify the name of your application. If the application name
	 * is {@code null} or blank, the application will log a warning. Suggested
	 * format is "MyCompany-ProductName/1.0". If you are running the sample on a
	 * machine where you have access to a browser, set AUTH_LOCAL_WEBSERVER to
	 * true.
	 */
	private static final String APPLICATION_NAME = "Livro do Lecheta";
	private static final String BUCKET_NAME = Constants.BUCKET_NAME;
	private static final String CLIENT_SECRET_FILENAME = "client_secrets.json";
	private static final boolean AUTH_LOCAL_WEBSERVER = true;

	/** Directory to store user credentials. */
	private static final java.io.File DATA_STORE_DIR = new java.io.File(
			System.getProperty("user.home"), ".store/storage_sample");

	/**
	 * 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;

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

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

	private static Storage client;

	/** Authorizes the installed application to access user's protected data. */
	private static Credential authorize() throws Exception {
		// Load client secrets.
		GoogleClientSecrets clientSecrets = null;
		try {
			clientSecrets = GoogleClientSecrets.load(
					JSON_FACTORY,
					new InputStreamReader(StorageSample.class
							.getResourceAsStream(String.format("/%s",
									CLIENT_SECRET_FILENAME))));
			if (clientSecrets.getDetails().getClientId() == null
					|| clientSecrets.getDetails().getClientSecret() == null) {
				throw new Exception("client_secrets not well formed.");
			}
		} catch (Exception e) {
			System.out
					.println("Problem loading client_secrets.json file. Make sure it exists, you are "
							+ "loading it with the right path, and a client ID and client secret are "
							+ "defined in it.\n" + e.getMessage());
			System.exit(1);
		}

		// Set up authorization code flow.
		// Ask for only the permissions you need. Asking for more permissions
		// will
		// reduce the number of users who finish the process for giving you
		// access
		// to their accounts. It will also increase the amount of effort you
		// will
		// have to spend explaining to users what you are doing with their data.
		// Here we are listing all of the available scopes. You should remove
		// scopes
		// that you are not actually using.
		Set<String> scopes = new HashSet<String>();
		scopes.add(StorageScopes.DEVSTORAGE_FULL_CONTROL);
		scopes.add(StorageScopes.DEVSTORAGE_READ_ONLY);
		scopes.add(StorageScopes.DEVSTORAGE_READ_WRITE);

		GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
				httpTransport, JSON_FACTORY, clientSecrets, scopes)
				.setDataStoreFactory(dataStoreFactory).build();
		// Authorize.
		VerificationCodeReceiver receiver = AUTH_LOCAL_WEBSERVER ? new LocalServerReceiver()
				: new GooglePromptReceiver();
		return new AuthorizationCodeInstalledApp(flow, receiver)
				.authorize("user");
	}

	public static void main(String[] args) {
		try {
			// Initialize the transport.
			httpTransport = GoogleNetHttpTransport.newTrustedTransport();

			// Initialize the data store factory.
			dataStoreFactory = new FileDataStoreFactory(DATA_STORE_DIR);

			// Authorization.
			Credential credential = authorize();

			// Set up global Storage instance.
			client = new Storage.Builder(httpTransport, JSON_FACTORY,
					credential).setApplicationName(APPLICATION_NAME).build();

			// Get metadata about the specified bucket.
			Storage.Buckets.Get getBucket = client.buckets().get(BUCKET_NAME);
			getBucket.setProjection("full");
			Bucket bucket = getBucket.execute();
			System.out.println("name: " + BUCKET_NAME);
			System.out.println("location: " + bucket.getLocation());
			System.out.println("timeCreated: " + bucket.getTimeCreated());
			System.out.println("owner: " + bucket.getOwner());

			// List the contents of the bucket.
			Storage.Objects.List listObjects = client.objects().list(
					BUCKET_NAME);
			com.google.api.services.storage.model.Objects objects;
			do {
				objects = listObjects.execute();
				List<StorageObject> items = objects.getItems();
				if (null == items) {
					System.out
							.println("There were no objects in the given bucket; try adding some and re-running.");
					break;
				}
				for (StorageObject object : items) {
					System.out.println(object.getName() + " ("
							+ object.getSize() + " bytes)");
				}
				listObjects.setPageToken(objects.getNextPageToken());
			} while (null != objects.getNextPageToken());

		} catch (IOException e) {
			System.err.println(e.getMessage());
		} catch (Throwable t) {
			t.printStackTrace();
		}
		System.exit(1);
	}
}
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