/*

* Copyright (C) 2018 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 org.oidc.msg;

import com.auth0.jwt.exceptions.JWTDecodeException;

/**

* Collection of utility methods related to messages.

*/

public final class MessageUtil {

private MessageUtil() {

// no op

}

/**

* Splits the given token on the "." chars into a String array with 3 parts.

*

* @param token The string to split. Expected to have at least two parts.

* @return the array representing the 3or parts of the token.

* @throws JWTDecodeException if the given token doesn't have 2 (empty signature) or 3 parts.

*/

public static String[] splitToken(String token) throws JWTDecodeException {

String[] parts = token.split("\\.");

if (parts.length == 2 && token.endsWith(".")) {

// Tokens with alg='none' have empty String as Signature.

parts = new String[] { parts[0], parts[1], "" };

}

if (parts.length != 3) {

throw new JWTDecodeException(String

.format("The token was expected to have 3 parts, but got %s.", parts.length));

}

return parts;

}

}