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/*
 * Copyright 2017-2023 original authors
 *
 * 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
 *
 * 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 io.micronaut.security.token.jwt.signature.rsa;

import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.JWSVerifier;
import com.nimbusds.jose.crypto.RSASSAVerifier;
import com.nimbusds.jose.crypto.impl.RSASSAProvider;
import com.nimbusds.jwt.SignedJWT;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.security.token.jwt.signature.AbstractSignatureConfiguration;
import java.security.interfaces.RSAPublicKey;

/**
 * RSA signature.
 * @see JSON Web Token (JWT) with RSA signature
 *
 * @author Sergio del Amo
 * @since 1.0
 */
public class RSASignature extends AbstractSignatureConfiguration {

    private RSAPublicKey publicKey;

    /**
     *
     * @param config Instance of {@link RSASignatureConfiguration}
     */
    public RSASignature(RSASignatureConfiguration config) {
        this.publicKey = config.getPublicKey();
    }

    /**
     *
     * @return message explaining the supported algorithms
     */
    @Override
    public String supportedAlgorithmsMessage() {
        return "Only the RS256, RS384, RS512, PS256, PS384 and PS512 algorithms are supported for RSA signature";
    }

    @Override
    public boolean supports(final JWSAlgorithm algorithm) {
        return algorithm != null && RSASSAProvider.SUPPORTED_ALGORITHMS.contains(algorithm);
    }

    @Override
    public boolean verify(final SignedJWT jwt) throws JOSEException {
        return verifyWithPublicKey(jwt, this.publicKey);
    }

    private boolean verifyWithPublicKey(final SignedJWT jwt, @NonNull RSAPublicKey publicKey) throws JOSEException {
        final JWSVerifier verifier = new RSASSAVerifier(publicKey);
        return jwt.verify(verifier);
    }
}