com.skubit.bitid.JwtBuilder.java Source code

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Here is the source code for com.skubit.bitid.JwtBuilder.java

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/**
 * Copyright 2015 Skubit
 *
 * 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.skubit.bitid;

import org.bitcoinj.core.ECKey;
import org.bitcoinj.params.MainNetParams;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import static com.google.common.io.BaseEncoding.base64Url;

public class JwtBuilder {

    public static String buildRequest(ECKey mKey, TidBit tidbit)
            throws UnsupportedEncodingException, NoSuchAlgorithmException, JSONException, InvalidKeyException {

        JSONObject claims = new JSONObject();
        long iat = (System.currentTimeMillis() / 1000L);
        String address = URLDecoder.decode(mKey.toAddress(MainNetParams.get()).toString(), "UTF-8");

        claims.put("iss", address);
        claims.put("iat", iat);
        claims.put("jti", tidbit.getNonce());
        claims.put("exp", iat + 180L);
        claims.put("aud", tidbit.getRawUri());
        claims.put("scope", tidbit.getScope());
        claims.put("app", tidbit.getApplication());

        return signAndBuildWebToken(claims, mKey);
    }

    private static String signAndBuildWebToken(JSONObject claims, ECKey mKey)
            throws InvalidKeyException, NoSuchAlgorithmException, JSONException, UnsupportedEncodingException {
        String message = buildHeaderAndClaims(claims);
        String signature64 = mKey.signMessage(message);
        return message + "." + signature64;
    }

    private static String buildHeaderAndClaims(JSONObject claims)
            throws InvalidKeyException, NoSuchAlgorithmException, JSONException, UnsupportedEncodingException {
        JSONObject header = new JSONObject();
        header.put("alg", "ES256");
        header.put("typ", "JWT");
        StringBuilder sb = new StringBuilder();
        return sb.append(base64Url().encode(header.toString().getBytes("UTF-8"))).append(".")
                .append(base64Url().encode(claims.toString().getBytes("UTF-8"))).toString();
    }
}