@okta-dfuhriman/okta-auth-js/lib/oidc/decodeToken.ts

The Okta Auth SDK

/*!
 * Copyright (c) 2015-present, Okta, Inc. and/or its affiliates. All rights reserved.
 * The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (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.
 *
 */
import { AuthSdkError } from '../errors';
import { JWTObject } from './types';
import { base64UrlToString } from '../crypto';

export function decodeToken(token: string): JWTObject {
  var jwt = token.split('.');
  var decodedToken: JWTObject;

  try {
    decodedToken = {
      header: JSON.parse(base64UrlToString(jwt[0])),
      payload: JSON.parse(base64UrlToString(jwt[1])),
      signature: jwt[2]
    };
  } catch (e) {
    throw new AuthSdkError('Malformed token');
  }

  return decodedToken;
}