/*
* Copyright 2011 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 com.google.paymentexpress.jwt;
import java.security.InvalidKeyException;
import java.security.SignatureException;
import java.util.Calendar;
import java.util.HashMap;
import org.joda.time.Instant;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import net.oauth.jsontoken.JsonToken;
import net.oauth.jsontoken.crypto.HmacSHA256Signer;
/**
* Helper class to convert Java Objects to JSON Web Tokens
*
* @author pying@google.com (Peng Ying)
*
*/
public class JWTGenerator {
/**
* Default Constructor
*/
private JWTGenerator(){
}
/**
*
* @param target
* @return
* @throws InvalidKeyException
* @throws SignatureException
*/
public static String generate(JWTInterface target) throws InvalidKeyException, SignatureException{
Calendar cal = Calendar.getInstance();
HmacSHA256Signer signer = new HmacSHA256Signer(target.getIssuer(), null, target.getMerchantSecret().getBytes());
JsonToken token = new JsonToken(signer);
token.setAudience(target.getAudience());
token.setParam("typ", target.getType());
token.setIssuedAt(target.getIat() != null ? new Instant(target.getIat()) : new Instant(cal.getTimeInMillis()));
//token.setExpiration(target.getExp() != null? new Instant(target.getExp()) : new Instant(cal.getTimeInMillis() + 6000000L));
JsonObject payload = token.getPayloadAsJsonObject();
HashMap<String, JsonElement> params = target.getContent();
for(String key:params.keySet()){
payload.add(key, params.get(key));
}
return token.serializeAndSign();
}
}