/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.superbiz;

import com.nimbusds.jose.JOSEObjectType;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.JWSHeader;
import com.nimbusds.jose.crypto.RSASSASigner;
import com.nimbusds.jwt.JWTClaimsSet;
import com.nimbusds.jwt.SignedJWT;

import java.io.InputStream;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

/**
 * Utilities for generating a JWT for testing
 */
public class Tokens {

    private Tokens() {
    }

    /**
     * Read a PEM encoded private key from the classpath
     *
     * @param pemResName - key file resource name
     * @return PrivateKey
     * @throws Exception on decode failure
     */
    public static PrivateKey readPrivateKey(String pemResName) throws Exception {
        InputStream contentIS = Tokens.class.getResourceAsStream(pemResName);
        byte[] tmp = new byte[4096];
        int length = contentIS.read(tmp);
        return decodePrivateKey(new String(tmp, 0, length));
    }

    /**
     * Decode a PEM encoded private key string to an RSA PrivateKey
     *
     * @param pemEncoded - PEM string for private key
     * @return PrivateKey
     * @throws Exception on decode failure
     */
    public static PrivateKey decodePrivateKey(String pemEncoded) throws Exception {
        pemEncoded = removeBeginEnd(pemEncoded);
        byte[] pkcs8EncodedBytes = Base64.getDecoder().decode(pemEncoded);

        // extract the private key

        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pkcs8EncodedBytes);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        return kf.generatePrivate(keySpec);
    }

    private static String removeBeginEnd(String pem) {
        pem = pem.replaceAll("-----BEGIN (.*)-----", "");
        pem = pem.replaceAll("-----END (.*)----", "");
        pem = pem.replaceAll("\r\n", "");
        pem = pem.replaceAll("\n", "");
        return pem.trim();
    }

    public static String asToken(final String claims) throws Exception {
        final PrivateKey pk = readPrivateKey("/testkey.pem");

        try {
            final JWSHeader header = new JWSHeader.Builder(JWSAlgorithm.RS256)
                    .type(JOSEObjectType.JWT)
                    .build();

            final JWTClaimsSet claimsSet = JWTClaimsSet.parse(claims);

            final SignedJWT jwt = new SignedJWT(header, claimsSet);

            jwt.sign(new RSASSASigner(pk));

            return jwt.serialize();
        } catch (Exception e) {
            throw new RuntimeException("Could not sign JWT");
        }
    }
}
