/*
 * Copyright 2019 ZHENG BAO LE
 *
 * 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 me.zbl.authmore.platform.jwk;

import com.nimbusds.jose.jwk.JWK;
import com.nimbusds.jose.jwk.JWKSet;
import com.nimbusds.jose.jwk.KeyUse;
import com.nimbusds.jose.jwk.RSAKey;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.UUID;

/**
 * @author ZHENG BAO LE
 * @since 2019-05-14
 */
@Configuration
public class JWKConfiguration {

    @Bean
    public JWKSet jwkSet() throws NoSuchAlgorithmException {

        KeyPair keyPair = keyPair();
        JWK jwk = new RSAKey.Builder((RSAPublicKey) keyPair.getPublic())
                .privateKey((RSAPrivateKey) keyPair.getPrivate())
                .keyUse(KeyUse.SIGNATURE)
                .keyID(UUID.randomUUID().toString())
                .build();
        return new JWKSet(jwk);
    }

    @Bean
    public KeyPair keyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
        gen.initialize(2048);
        return gen.generateKeyPair();
    }
}
