/*
 *  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
 *
 *    https://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 grails.plugin.springsecurity.rest.token.generation.jwt

import groovy.transform.CompileStatic
import groovy.util.logging.Slf4j

import com.nimbusds.jose.JWSAlgorithm
import com.nimbusds.jose.JWSHeader
import com.nimbusds.jose.JWSSigner
import com.nimbusds.jose.crypto.MACSigner
import com.nimbusds.jwt.JWT
import com.nimbusds.jwt.JWTClaimsSet
import com.nimbusds.jwt.SignedJWT

import org.springframework.beans.factory.InitializingBean

/**
 * Generates JWT's protected using HMAC with SHA-256
 */
@Slf4j
@CompileStatic
class SignedJwtTokenGenerator extends AbstractJwtTokenGenerator implements InitializingBean {

    String jwtSecret

    JWSSigner signer

    JWSAlgorithm jwsAlgorithm

    @Override
    void afterPropertiesSet() throws Exception {
        signer = new MACSigner(jwtSecret)
    }

    @Override
    protected JWT generateAccessToken(JWTClaimsSet claimsSet) {
        SignedJWT signedJWT = new SignedJWT(new JWSHeader(jwsAlgorithm), claimsSet)
        signedJWT.sign(signer)

        return signedJWT
    }

}
