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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.jwx;

import org.jose4j.base64url.Base64Url;
import org.jose4j.json.JsonUtil;
import org.jose4j.jwk.JsonWebKey;
import org.jose4j.jwk.PublicJsonWebKey;
import org.jose4j.lang.JoseException;
import org.jose4j.lang.JsonHelp;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 */
public class Headers
{
    protected Base64Url base64url = new Base64Url();

    private Map headerMap = new LinkedHashMap();
    private String header;
    private String encodedHeader;

    public String getFullHeaderAsJsonString()
    {
        if (header == null)
        {
            header = JsonUtil.toJson(headerMap);
        }
        return header;
    }

    public String getEncodedHeader()
    {
        if (encodedHeader == null)
        {
            String headerAsString = getFullHeaderAsJsonString();
            encodedHeader = base64url.base64UrlEncodeUtf8ByteRepresentation(headerAsString);
        }
        return encodedHeader;
    }

    public void setStringHeaderValue(String name, String value)
    {
        setObjectHeaderValue(name, value);
    }

    public void setObjectHeaderValue(String name, Object value)
    {
        headerMap.put(name, value);
        this.header = null;
        this.encodedHeader = null;
    }

    public void setJwkHeaderValue(String name, JsonWebKey jwk)
    {
        Map jwkParams = jwk.toParams(JsonWebKey.OutputControlLevel.PUBLIC_ONLY);
        setObjectHeaderValue(name, jwkParams);
    }

    public String getStringHeaderValue(String headerName)
    {
        return JsonHelp.getString(headerMap, headerName);
    }

    public Long getLongHeaderValue(String headerName)
    {
        return JsonHelp.getLong(headerMap, headerName);
    }

    public Object getObjectHeaderValue(String name)
    {
        return headerMap.get(name);
    }

    public JsonWebKey getJwkHeaderValue(String name) throws JoseException
    {
        Object objectHeaderValue = getObjectHeaderValue(name);
        Map jwkParams = (Map) objectHeaderValue;
        return JsonWebKey.Factory.newJwk(jwkParams);
    }

    public PublicJsonWebKey getPublicJwkHeaderValue(String name, String jcaProvider) throws JoseException
    {
        Object objectHeaderValue = getObjectHeaderValue(name);
        Map jwkParams = (Map) objectHeaderValue;
        return PublicJsonWebKey.Factory.newPublicJwk(jwkParams, jcaProvider);
    }


    public void setFullHeaderAsJsonString(String header) throws JoseException
    {
        this.encodedHeader = null;
        this.header = header;
        headerMap = JsonUtil.parseJson(header);
    }

    void setEncodedHeader(String encodedHeader) throws JoseException
    {
        this.encodedHeader = encodedHeader;
        this.header = base64url.base64UrlDecodeToUtf8String(this.encodedHeader);
        this.headerMap = JsonUtil.parseJson(header);
    }
}