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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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 io.fabric8.kubernetes.client.internal;

import io.fabric8.kubernetes.client.Config;
import io.fabric8.kubernetes.client.ConfigBuilder;
import io.fabric8.kubernetes.client.http.HttpClient;
import io.fabric8.kubernetes.client.http.HttpRequest;
import io.fabric8.kubernetes.client.http.HttpResponse;
import io.fabric8.kubernetes.client.utils.HttpClientUtils;
import io.fabric8.kubernetes.client.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509ExtendedTrustManager;

import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;

import static io.fabric8.kubernetes.client.internal.CertUtils.createKeyStore;
import static io.fabric8.kubernetes.client.internal.CertUtils.createTrustStore;

public final class SSLUtils {

    private static final Logger LOG = LoggerFactory.getLogger(SSLUtils.class);

    private SSLUtils() {
        //Utility
    }

    public static boolean isHttpsAvailable(Config config) {
        Config sslConfig = new ConfigBuilder(config)
                .withMasterUrl(Config.HTTPS_PROTOCOL_PREFIX + config.getMasterUrl())
                .withRequestTimeout(1000)
                .withConnectionTimeout(1000)
                .build();

        try (HttpClient client = HttpClientUtils.createHttpClient(config)) {
            HttpRequest request = client.newHttpRequestBuilder().uri(sslConfig.getMasterUrl())
                    .build();
            HttpResponse response = client.send(request, InputStream.class);
            response.body().close();
            return response.isSuccessful();
        } catch (Throwable t) {
            LOG.warn("SSL handshake failed. Falling back to insecure connection.");
        }
        return false;
    }

    public static SSLContext sslContext(Config config) throws CertificateException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyStoreException, IOException, InvalidKeySpecException, KeyManagementException {
        return sslContext(keyManagers(config), trustManagers(config));
    }

    public static SSLContext sslContext(KeyManager[] keyManagers, TrustManager[] trustManagers) throws NoSuchAlgorithmException, KeyManagementException {
        SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
        sslContext.init(keyManagers, trustManagers, new SecureRandom());
        return sslContext;
    }

    public static TrustManager[] trustManagers(Config config) throws CertificateException, NoSuchAlgorithmException, KeyStoreException, IOException {
        return trustManagers(config.getCaCertData(), config.getCaCertFile(), config.isTrustCerts(), config.getTrustStoreFile(), config.getTrustStorePassphrase());
    }

    public static TrustManager[] trustManagers(String certData, String certFile, boolean isTrustCerts, String trustStoreFile, String trustStorePassphrase) throws CertificateException, NoSuchAlgorithmException, KeyStoreException, IOException {
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        KeyStore trustStore = null;
        if (isTrustCerts) {
            return new TrustManager[]{
                new X509ExtendedTrustManager() {
                    @Override
                    public void checkClientTrusted(X509Certificate[] chain, String s) {
                      //not needed
                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] chain, String s) {
                      //not needed
                    }

                    @Override
                    public X509Certificate[] getAcceptedIssuers() {
                        return new X509Certificate[0];
                    }

                    @Override
                    public void checkClientTrusted(X509Certificate[] chain, String authType, Socket socket)
                        throws CertificateException {
                      //not needed
                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] chain, String authType, Socket socket)
                        throws CertificateException {
                      //not needed
                    }

                    @Override
                    public void checkClientTrusted(X509Certificate[] chain, String authType, SSLEngine engine)
                        throws CertificateException {
                      //not needed
                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] chain, String authType, SSLEngine engine)
                        throws CertificateException {
                      //not needed
                    }
                }
            };
        } else if (Utils.isNotNullOrEmpty(certData) || Utils.isNotNullOrEmpty(certFile)) {
            trustStore = createTrustStore(certData, certFile, trustStoreFile, trustStorePassphrase);
        }
        tmf.init(trustStore);
        return tmf.getTrustManagers();
    }

    public static KeyManager[] keyManagers(Config config) throws NoSuchAlgorithmException, UnrecoverableKeyException, KeyStoreException, CertificateException, InvalidKeySpecException, IOException {
        return keyManagers(config.getClientCertData(), config.getClientCertFile(), config.getClientKeyData(), config.getClientKeyFile(), config.getClientKeyAlgo(), config.getClientKeyPassphrase(), config.getKeyStoreFile(), config.getKeyStorePassphrase());
    }

    public static KeyManager[] keyManagers(String certData, String certFile, String keyData, String keyFile, String algo, String passphrase, String keyStoreFile, String keyStorePassphrase) throws NoSuchAlgorithmException, UnrecoverableKeyException, KeyStoreException, CertificateException, InvalidKeySpecException, IOException {
        KeyManager[] keyManagers = null;
        if ((Utils.isNotNullOrEmpty(certData) || Utils.isNotNullOrEmpty(certFile)) && (Utils.isNotNullOrEmpty(keyData) || Utils.isNotNullOrEmpty(keyFile))) {
            KeyStore keyStore = createKeyStore(certData, certFile, keyData, keyFile, algo, passphrase, keyStoreFile, keyStorePassphrase);
            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(keyStore, passphrase.toCharArray());
            keyManagers = kmf.getKeyManagers();
        }
        return keyManagers;
    }

    public static KeyManager[] keyManagers(InputStream certInputStream, InputStream keyInputStream, String algo, String passphrase, String keyStoreFile, String keyStorePassphrase) throws NoSuchAlgorithmException, UnrecoverableKeyException, KeyStoreException, CertificateException, InvalidKeySpecException, IOException {
        KeyStore keyStore = createKeyStore(certInputStream, keyInputStream, algo, passphrase.toCharArray(), keyStoreFile, keyStorePassphrase.toCharArray());
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        kmf.init(keyStore, passphrase.toCharArray());
        return kmf.getKeyManagers();
    }
}