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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.

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/*
 * 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.auth;

import com.google.firebase.tasks.Task;

/**
 * Provides Google OAuth2 access tokens used to authenticate with Firebase services. In most cases,
 * you will not need to implement this yourself and can instead use the default implementations
 * provided by {@link FirebaseCredentials}.
 *
 * @deprecated Use {@code GoogleCredentials}.
 */
public interface FirebaseCredential {

  /**
   * Returns a Google OAuth2 access token which can be used to authenticate with Firebase services.
   * This method does not cache tokens, and therefore each invocation will fetch a fresh token.
   * The caller is expected to implement caching by referencing the token expiry details
   * available in the returned GoogleOAuthAccessToken instance.
   *
   * @return A {@link Task} providing a Google OAuth access token.
   */
  Task getAccessToken();
}