// Copyright 2021 The Android Open Source Project
//
// 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.android.downloader;

import com.google.common.util.concurrent.ListenableFuture;
import java.net.URI;

/**
 * Provider interface for supplying OAuth tokens for a request. The tokens generated by this method
 * are added to requests as http headers. For more details, see the official spec for this
 * authorization mechanism: https://tools.ietf.org/html/rfc6750#page-5
 */
public interface OAuthTokenProvider {
  /** Provides an OAuth bearer token for the given URI. */
  ListenableFuture<String> provideOAuthToken(URI uri);
}