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The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

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/*
 * Copyright 2012-2017 Brian Campbell
 *
 * 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.jose4j.base64url;

import org.jose4j.base64url.internal.apache.commons.codec.binary.Base64;
import org.jose4j.lang.StringUtil;

/**
 */
public class Base64Url
{
    private Base64 base64urlCodec;

    public Base64Url()
    {
        this.base64urlCodec = new Base64(-1, null, true);
    }

    public String base64UrlDecodeToUtf8String(String encodedValue)
    {
        return base64UrlDecodeToString(encodedValue, StringUtil.UTF_8);
    }

    public String base64UrlDecodeToString(String encodedValue, String charsetName)
    {
        byte[] bytes = base64UrlDecode(encodedValue);
        return StringUtil.newString(bytes, charsetName);
    }

    public byte[] base64UrlDecode(String encodedValue)
    {
        return base64urlCodec.decode(encodedValue);
    }

    public String base64UrlEncodeUtf8ByteRepresentation(String value)
    {
        return base64UrlEncode(value, StringUtil.UTF_8);
    }

    public String base64UrlEncode(String value, String charsetName)
    {
        byte[] bytes = StringUtil.getBytesUnchecked(value, charsetName);
        return base64UrlEncode(bytes);
    }

    public String base64UrlEncode(byte[] bytes)
    {
        return base64urlCodec.encodeToString(bytes);
    }

    private static Base64Url getOne()
    {
        return new Base64Url();
    }

    public static String decodeToUtf8String(String encodedValue)
    {
        return getOne().base64UrlDecodeToString(encodedValue, StringUtil.UTF_8);
    }

    public static String decodeToString(String encodedValue, String charsetName)
    {
        return getOne().base64UrlDecodeToString(encodedValue, charsetName);
    }

    public static byte[] decode(String encodedValue)
    {
        return getOne().base64UrlDecode(encodedValue);
    }

    public static String encodeUtf8ByteRepresentation(String value)
    {
        return getOne().base64UrlEncodeUtf8ByteRepresentation(value);
    }

    public static String encode(String value, String charsetName)
    {
        return getOne().base64UrlEncode(value, charsetName);
    }

    public static String encode(byte[] bytes)
    {
        return getOne().base64UrlEncode(bytes);
    }
}