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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.encryption.ec;

import com.nimbusds.jose.EncryptionMethod;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWEAlgorithm;
import com.nimbusds.jose.JWEDecrypter;
import com.nimbusds.jose.JWEEncrypter;
import com.nimbusds.jose.crypto.ECDHDecrypter;
import com.nimbusds.jose.crypto.ECDHEncrypter;
import com.nimbusds.jose.crypto.impl.ECDHCryptoProvider;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.security.token.jwt.encryption.AbstractEncryptionConfiguration;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;

/**
 * Elliptic curve encryption configuration.
 *
 * @author Sergio del Amo
 * @since 1.0
 */
public class ECEncryption extends AbstractEncryptionConfiguration {

    private ECPublicKey publicKey;

    private ECPrivateKey privateKey;

    /**
     *
     * @param ecEncryptionConfiguration Instance of {@link ECEncryptionConfiguration}
     */
    public ECEncryption(ECEncryptionConfiguration ecEncryptionConfiguration) {
        this.method = ecEncryptionConfiguration.getEncryptionMethod();
        this.algorithm = ecEncryptionConfiguration.getJweAlgorithm();
        this.publicKey = ecEncryptionConfiguration.getPublicKey();
        this.privateKey = ecEncryptionConfiguration.getPrivateKey();
    }

    @Override
    public boolean supports(final JWEAlgorithm algorithm, final EncryptionMethod method) {
        if (algorithm != null && method != null) {
            return ECDHCryptoProvider.SUPPORTED_ALGORITHMS.contains(algorithm) && ECDHCryptoProvider.SUPPORTED_ENCRYPTION_METHODS.contains(method);
        }
        return false;
    }

    /**
     *
     * @return message explaining the supported algorithms
     */
    @Override
    public String supportedAlgorithmsMessage() {
        return "Only Elliptic-curve algorithms are supported with the appropriate encryption method";
    }

    @Override
    protected JWEEncrypter buildEncrypter() throws JOSEException {
        return buildEncrypterWithPublicKey(this.publicKey);
    }

    /**
     * Instantiates {@link ECDHEncrypter} with {@link ECPublicKey}.
     * @param publicKey Instance of {@link ECPublicKey}
     * @return Instance of {@link ECDHEncrypter}
     * @throws JOSEException if the {@link ECDHEncrypter} cannot be intantiated
     */
    protected JWEEncrypter buildEncrypterWithPublicKey(@NonNull ECPublicKey publicKey) throws JOSEException {
        return new ECDHEncrypter(publicKey);
    }

    @Override
    protected JWEDecrypter buildDecrypter() throws JOSEException {
        return buildDecrypterWithPrivateKey(this.privateKey);
    }

    private JWEDecrypter buildDecrypterWithPrivateKey(ECPrivateKey privateKey) throws JOSEException {
        return new ECDHDecrypter(privateKey);
    }
}