com.google.firebase.cloud.StorageClient Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of firebase-admin Show documentation
This is the official Firebase Admin Java SDK. Build extraordinary native JVM apps in minutes with Firebase. The Firebase platform can power your app’s backend, user authentication, static hosting, and more.
The newest version!
/*
 * Copyright 2017 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 com.google.firebase.cloud;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import com.google.firebase.FirebaseApp;
import com.google.firebase.ImplFirebaseTrampolines;
import com.google.firebase.internal.FirebaseService;

/**
 * StorageClient provides access to Google Cloud Storage APIs. You can specify a default cloud
 * storage bucket via {@link com.google.firebase.FirebaseOptions}, and then get a reference to this
 * default bucket by calling {@link StorageClient#bucket()}. Or you can get a reference to a
 * specific bucket at any time by calling {@link StorageClient#bucket(String)}.
 *
 * This class requires Google Cloud Storage libraries for Java. Make sure the artifact
 * google-cloud-storage is in the classpath along with its transitive dependencies.
 */
public class StorageClient {

  private final FirebaseApp app;
  private final Storage storage;

  @VisibleForTesting
  StorageClient(FirebaseApp app, Storage storage) {
    this.app = checkNotNull(app, "FirebaseApp must not be null");
    this.storage = checkNotNull(storage, "Storage must not be null");
  }

  public static StorageClient getInstance() {
    return getInstance(FirebaseApp.getInstance());
  }

  public static synchronized StorageClient getInstance(FirebaseApp app) {
    StorageClientService service = ImplFirebaseTrampolines.getService(app, SERVICE_ID,
        StorageClientService.class);
    if (service == null) {
      Storage storage = StorageOptions.newBuilder()
          .setCredentials(ImplFirebaseTrampolines.getCredentials(app))
          .build()
          .getService();
      StorageClient client = new StorageClient(app, storage);
      service = ImplFirebaseTrampolines.addService(app, new StorageClientService(client));
    }
    return service.getInstance();
  }

  /**
   * Returns the default cloud storage bucket associated with the current app. This is the bucket
   * configured via {@link com.google.firebase.FirebaseOptions} when initializing the app. If
   * no bucket was configured via options, this method throws an exception.
   *
   * @return a cloud storage {@code Bucket}
   *     instance.
   * @throws IllegalArgumentException If no bucket is configured via FirebaseOptions,
   *     or if the bucket does not exist.
   */
  public Bucket bucket() {
    return bucket(app.getOptions().getStorageBucket());
  }

  /**
   * Returns a cloud storage Bucket instance for the specified bucket name.
   *
   * @param name a non-null, non-empty bucket name.
   * @return a cloud storage {@code Bucket}
   *     instance.
   * @throws IllegalArgumentException If the bucket name is null, empty, or if the specified
   *     bucket does not exist.
   */
  public Bucket bucket(String name) {
    checkArgument(!Strings.isNullOrEmpty(name),
        "Bucket name not specified. Specify the bucket name via the storageBucket "
            + "option when initializing the app, or specify the bucket name explicitly when "
            + "calling the getBucket() method.");
    Bucket bucket = storage.get(name);
    checkArgument(bucket != null, "Bucket " + name + " does not exist.");
    return bucket;
  }

  private static final String SERVICE_ID = StorageClient.class.getName();

  private static class StorageClientService extends FirebaseService {

    StorageClientService(StorageClient client) {
      super(SERVICE_ID, client);
    }
  }
}