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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.jetty94;

import com.github.tomakehurst.wiremock.common.BrowserProxySettings;
import com.github.tomakehurst.wiremock.common.HttpsSettings;
import com.github.tomakehurst.wiremock.common.Notifier;
import com.github.tomakehurst.wiremock.common.ssl.KeyStoreSettings;
import com.github.tomakehurst.wiremock.core.Options;
import com.github.tomakehurst.wiremock.http.ssl.CertificateAuthority;
import com.github.tomakehurst.wiremock.http.ssl.CertificateGenerationUnsupportedException;
import com.github.tomakehurst.wiremock.http.ssl.X509KeyStore;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.http2.HTTP2Cipher;
import org.eclipse.jetty.server.SslConnectionFactory;
import org.eclipse.jetty.util.ssl.SslContextFactory;

import java.io.IOException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;

public class SslContexts {

    public static SslContextFactory.Server buildHttp2SslContextFactory(HttpsSettings httpsSettings) {
        SslContextFactory.Server sslContextFactory = SslContexts.defaultSslContextFactory(httpsSettings.keyStore());
        sslContextFactory.setKeyManagerPassword(httpsSettings.keyManagerPassword());
        setupClientAuth(sslContextFactory, httpsSettings);
        sslContextFactory.setCipherComparator(HTTP2Cipher.COMPARATOR);
        sslContextFactory.setProvider("Conscrypt");
        return sslContextFactory;
    }

    public static SslContextFactory.Server buildManInTheMiddleSslContextFactory(HttpsSettings httpsSettings, BrowserProxySettings browserProxySettings, final Notifier notifier) {
        KeyStoreSettings browserProxyCaKeyStore = browserProxySettings.caKeyStore();
        SslContextFactory.Server sslContextFactory = buildSslContextFactory(notifier, browserProxyCaKeyStore, httpsSettings.keyStore());
        setupClientAuth(sslContextFactory, httpsSettings);
        return sslContextFactory;
    }

    private static void setupClientAuth(SslContextFactory.Server sslContextFactory, HttpsSettings httpsSettings) {
        if (httpsSettings.hasTrustStore()) {
            sslContextFactory.setTrustStorePath(httpsSettings.trustStorePath());
            sslContextFactory.setTrustStorePassword(httpsSettings.trustStorePassword());
        }
        sslContextFactory.setNeedClientAuth(httpsSettings.needClientAuth());
    }

    private static SslContextFactory.Server buildSslContextFactory(Notifier notifier, KeyStoreSettings browserProxyCaKeyStore, KeyStoreSettings defaultHttpsKeyStore) {
        if (browserProxyCaKeyStore.exists()) {
            X509KeyStore existingKeyStore = toX509KeyStore(browserProxyCaKeyStore);
            return certificateGeneratingSslContextFactory(notifier, browserProxyCaKeyStore, existingKeyStore);
        } else {
            try {
                X509KeyStore newKeyStore = buildKeyStore(browserProxyCaKeyStore);
                return certificateGeneratingSslContextFactory(notifier, browserProxyCaKeyStore, newKeyStore);
            } catch (Exception e) {
                notifier.error("Unable to generate a certificate authority", e);
                return defaultSslContextFactory(defaultHttpsKeyStore);
            }
        }
    }

    private static SslContextFactory.Server defaultSslContextFactory(KeyStoreSettings defaultHttpsKeyStore) {
        SslContextFactory.Server sslContextFactory = new SslContextFactory.Server();
        setupKeyStore(sslContextFactory, defaultHttpsKeyStore);
        return sslContextFactory;
    }

    private static SslContextFactory.Server certificateGeneratingSslContextFactory(Notifier notifier, KeyStoreSettings browserProxyCaKeyStore, X509KeyStore newKeyStore) {
        SslContextFactory.Server sslContextFactory = new CertificateGeneratingSslContextFactory(newKeyStore, notifier);
        setupKeyStore(sslContextFactory, browserProxyCaKeyStore);
        // Unlike the default one, we can insist that the keystore password is the keystore password
        sslContextFactory.setKeyStorePassword(browserProxyCaKeyStore.password());
        return sslContextFactory;
    }

    private static void setupKeyStore(SslContextFactory.Server sslContextFactory, KeyStoreSettings keyStoreSettings) {
        sslContextFactory.setKeyStore(keyStoreSettings.loadStore());
        sslContextFactory.setKeyStorePassword(keyStoreSettings.password());
        sslContextFactory.setKeyStoreType(keyStoreSettings.type());
    }

    private static X509KeyStore toX509KeyStore(KeyStoreSettings browserProxyCaKeyStore) {
        try {
            return new X509KeyStore(browserProxyCaKeyStore.loadStore(), browserProxyCaKeyStore.password().toCharArray());
        } catch (KeyStoreException e) {
            // KeyStore must be loaded here, should never happen
            return throwUnchecked(e, null);
        }
    }

    private static X509KeyStore buildKeyStore(KeyStoreSettings browserProxyCaKeyStore) throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException, CertificateGenerationUnsupportedException {
        final CertificateAuthority certificateAuthority = CertificateAuthority.generateCertificateAuthority();
        KeyStore keyStore = KeyStore.getInstance(browserProxyCaKeyStore.type());
        char[] password = browserProxyCaKeyStore.password().toCharArray();
        keyStore.load(null, password);
        keyStore.setKeyEntry("wiremock-ca", certificateAuthority.key(), password, certificateAuthority.certificateChain());

        browserProxyCaKeyStore.getSource().save(keyStore);

        return new X509KeyStore(keyStore, password);
    }
}