/*! firebase-admin v9.12.0 */
/*!
 * Copyright 2020 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.
 */
/// <reference types="node" />
import { Agent } from 'http';
export interface ServiceAccount {
    projectId?: string;
    clientEmail?: string;
    privateKey?: string;
}
/**
 * Interface for Google OAuth 2.0 access tokens.
 */
export interface GoogleOAuthAccessToken {
    access_token: string;
    expires_in: number;
}
export declare namespace credential {
    /**
     * Interface that 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 credential `admin.credential`}.
     */
    interface Credential {
        /**
         * Returns a Google OAuth2 access token object used to authenticate with
         * Firebase services.
         *
         * This object contains the following properties:
         * * `access_token` (`string`): The actual Google OAuth2 access token.
         * * `expires_in` (`number`): The number of seconds from when the token was
         *   issued that it expires.
         *
         * @return A Google OAuth2 access token object.
         */
        getAccessToken(): Promise<GoogleOAuthAccessToken>;
    }
    /**
     * Returns a credential created from the
     * {@link
     *    https://developers.google.com/identity/protocols/application-default-credentials
     *    Google Application Default Credentials}
     * that grants admin access to Firebase services. This credential can be used
     * in the call to
     * {@link
     *   https://firebase.google.com/docs/reference/admin/node/admin#.initializeApp
     *  `admin.initializeApp()`}.
     *
     * Google Application Default Credentials are available on any Google
     * infrastructure, such as Google App Engine and Google Compute Engine.
     *
     * See
     * {@link
     *   https://firebase.google.com/docs/admin/setup#initialize_the_sdk
     *   Initialize the SDK}
     * for more details.
     *
     * @example
     * ```javascript
     * admin.initializeApp({
     *   credential: admin.credential.applicationDefault(),
     *   databaseURL: "https://<DATABASE_NAME>.firebaseio.com"
     * });
     * ```
     *
     * @param {!Object=} httpAgent Optional [HTTP Agent](https://nodejs.org/api/http.html#http_class_http_agent)
     *   to be used when retrieving access tokens from Google token servers.
     *
     * @return {!admin.credential.Credential} A credential authenticated via Google
     *   Application Default Credentials that can be used to initialize an app.
     */
    function applicationDefault(httpAgent?: Agent): Credential;
    /**
     * Returns a credential created from the provided service account that grants
     * admin access to Firebase services. This credential can be used in the call
     * to
     * {@link
     *   https://firebase.google.com/docs/reference/admin/node/admin#.initializeApp
     *   `admin.initializeApp()`}.
     *
     * See
     * {@link
     *   https://firebase.google.com/docs/admin/setup#initialize_the_sdk
     *   Initialize the SDK}
     * for more details.
     *
     * @example
     * ```javascript
     * // Providing a path to a service account key JSON file
     * var serviceAccount = require("path/to/serviceAccountKey.json");
     * admin.initializeApp({
     *   credential: admin.credential.cert(serviceAccount),
     *   databaseURL: "https://<DATABASE_NAME>.firebaseio.com"
     * });
     * ```
     *
     * @example
     * ```javascript
     * // Providing a service account object inline
     * admin.initializeApp({
     *   credential: admin.credential.cert({
     *     projectId: "<PROJECT_ID>",
     *     clientEmail: "foo@<PROJECT_ID>.iam.gserviceaccount.com",
     *     privateKey: "-----BEGIN PRIVATE KEY-----<KEY>-----END PRIVATE KEY-----\n"
     *   }),
     *   databaseURL: "https://<DATABASE_NAME>.firebaseio.com"
     * });
     * ```
     *
     * @param serviceAccountPathOrObject The path to a service
     *   account key JSON file or an object representing a service account key.
     * @param httpAgent Optional [HTTP Agent](https://nodejs.org/api/http.html#http_class_http_agent)
     *   to be used when retrieving access tokens from Google token servers.
     *
     * @return A credential authenticated via the
     *   provided service account that can be used to initialize an app.
     */
    function cert(serviceAccountPathOrObject: string | ServiceAccount, httpAgent?: Agent): Credential;
    /**
     * Returns a credential created from the provided refresh token that grants
     * admin access to Firebase services. This credential can be used in the call
     * to
     * {@link
     *   https://firebase.google.com/docs/reference/admin/node/admin#.initializeApp
     *   `admin.initializeApp()`}.
     *
     * See
     * {@link
     *   https://firebase.google.com/docs/admin/setup#initialize_the_sdk
     *   Initialize the SDK}
     * for more details.
     *
     * @example
     * ```javascript
     * // Providing a path to a refresh token JSON file
     * var refreshToken = require("path/to/refreshToken.json");
     * admin.initializeApp({
     *   credential: admin.credential.refreshToken(refreshToken),
     *   databaseURL: "https://<DATABASE_NAME>.firebaseio.com"
     * });
     * ```
     *
     * @param refreshTokenPathOrObject The path to a Google
     *   OAuth2 refresh token JSON file or an object representing a Google OAuth2
     *   refresh token.
     * @param httpAgent Optional [HTTP Agent](https://nodejs.org/api/http.html#http_class_http_agent)
     *   to be used when retrieving access tokens from Google token servers.
     *
     * @return A credential authenticated via the
     *   provided service account that can be used to initialize an app.
     */
    function refreshToken(refreshTokenPathOrObject: string | object, httpAgent?: Agent): Credential;
}