"use strict";
/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
var jws = require('jws');
var noop = Function.prototype;
var JWTAccess = /** @class */ (function () {
    /**
     * JWTAccess service account credentials.
     *
     * Create a new access token by using the credential to create a new JWT token
     * that's recognized as the access token.
     *
     * @param {string=} email the service account email address.
     * @param {string=} key the private key that will be used to sign the token.
     * @constructor
     */
    function JWTAccess(email, key) {
        this.email = email;
        this.key = key;
    }
    /**
     * Indicates whether the credential requires scopes to be created by calling
     * createdScoped before use.
     *
     * @return {boolean} always false
     */
    JWTAccess.prototype.createScopedRequired = function () {
        // JWT Header authentication does not use scopes.
        return false;
    };
    /**
     * Get a non-expired access token, after refreshing if necessary
     *
     * @param {string} authURI the URI being authorized
     * @param {function} metadataCb a callback invoked with the jwt
     *                   request metadata.
     */
    JWTAccess.prototype.getRequestMetadata = function (authURI, metadataCb) {
        var iat = Math.floor(new Date().getTime() / 1000);
        var exp = iat + 3600; // 3600 seconds = 1 hour
        // The payload used for signed JWT headers has:
        // iss == sub == <client email>
        // aud == <the authorization uri>
        var payload = { iss: this.email, sub: this.email, aud: authURI, exp: exp, iat: iat };
        var assertion = {
            header: { alg: 'RS256', typ: 'JWT' },
            payload: payload,
            secret: this.key
        };
        // Sign the jwt and invoke metadataCb with it.
        return this._signJWT(assertion, function (err, signedJWT) {
            if (!err) {
                return metadataCb(null, { Authorization: 'Bearer ' + signedJWT });
            }
            else {
                return metadataCb(err, null);
            }
        });
    };
    /**
     * Create a JWTAccess credentials instance using the given input options.
     * @param {object=} json The input object.
     * @param {function=} callback Optional callback.
     */
    JWTAccess.prototype.fromJSON = function (json, callback) {
        var done = callback || noop;
        if (!json) {
            done(new Error('Must pass in a JSON object containing the service account auth settings.'));
            return;
        }
        if (!json.client_email) {
            done(new Error('The incoming JSON object does not contain a client_email field'));
            return;
        }
        if (!json.private_key) {
            done(new Error('The incoming JSON object does not contain a private_key field'));
            return;
        }
        // Extract the relevant information from the json key file.
        this.email = json.client_email;
        this.key = json.private_key;
        this.projectId = json.project_id;
        done();
    };
    /**
     * Create a JWTAccess credentials instance using the given input stream.
     * @param {object=} stream The input stream.
     * @param {function=} callback Optional callback.
     */
    JWTAccess.prototype.fromStream = function (stream, callback) {
        var _this = this;
        var done = callback || noop;
        if (!stream) {
            setImmediate(function () {
                done(new Error('Must pass in a stream containing the service account auth settings.'));
            });
            return;
        }
        var s = '';
        stream.setEncoding('utf8');
        stream.on('data', function (chunk) {
            s += chunk;
        });
        stream.on('end', function () {
            try {
                var data = JSON.parse(s);
                _this.fromJSON(data, callback);
            }
            catch (err) {
                done(err);
            }
        });
    };
    /**
     * Sign the JWT object, returning any errors in the callback.
     *
     * signedJwtFn is a callback function(err, signedJWT); it is called with an
     * error if there is an exception during signing.
     *
     * @param  {object}   assertion   The assertion to sign
     * @param  {Function} signedJwtFn  fn(err, signedJWT)
     */
    JWTAccess.prototype._signJWT = function (assertion, signedJwtFn) {
        try {
            return signedJwtFn(null, jws.sign(assertion));
        }
        catch (err) {
            return signedJwtFn(err);
        }
    };
    return JWTAccess;
}());
exports.JWTAccess = JWTAccess;
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