/*
 * Copyright (C) 2022 THL A29 Limited, a Tencent company. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import javax.net.ssl.*;
import java.io.*;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.PKIXBuilderParameters;
import java.security.spec.PKCS8EncodedKeySpec;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Base64;
import java.util.Date;

/**
 * A template to use "www.example.com" as the server name.  The caller should
 *  set a virtual hosts file with System Property, "jdk.net.hosts.file". This
 *  class will map the loopback address to "www.example.com", and write to
 *  the specified hosts file.
 *
 *  Commands used:
 *  # Root CA
 *  > openssl req -new -config openssl.cnf -out root-ca.csr \
 *        -keyout private/root-ca.key -days 7300 -newkey rsa:2048
 *  > openssl ca -selfsign -config openssl.cnf -in root-ca.csr \
 *        -out certs/root-ca.crt -extensions v3_ca
 *  -keyfile private/root-ca.key -days 7300
 *
 *  # www.example.com
 *  > openssl req -new -keyout private/example.key \
 *        -out example.csr -days 7299 -newkey rsa:2048
 *  > openssl ca -config openssl.cnf -in example.csr \
 *        -out certs/example.crt -extensions usr_cert
 *  -keyfile private/root-ca.key -days 7299
 *
 *  # Client
 *  > openssl req -new -keyout private/client.key \
 *        -out client.csr -days 7299 -newkey rsa:2048
 *  > openssl ca -config openssl.cnf -in client.csr \
 *        -out certs/client.crt -extensions usr_cert
 *  -keyfile private/root-ca.key -days 7299
 *
 *  The key files should be in PKCS8 format:
 *  > openssl pkcs8 -topk8 -inform PEM -outform pem \
 *         -in private/example.key -out private/example-pkcs.key -nocrypt
 */
public enum SSLExampleCert {
    // Version: 3 (0x2)
    // Serial Number: 4097 (0x1001)
    // Signature Algorithm: sha256WithRSAEncryption
    // Issuer: C = US, ST = California, O = Example, OU = Test
    // Validity
    //     Not Before: Feb 25 20:12:04 2022 GMT
    //     Not After : Feb 20 20:12:04 2042 GMT
    // Subject: C = US, ST = California, O = Example, OU = Test
    // Subject Public Key Info:
    //     Public Key Algorithm: rsaEncryption
    //         RSA Public-Key: (2048 bit)
    CA_RSA("RSA",
        """
            -----BEGIN CERTIFICATE-----
            MIIDtDCCApygAwIBAgICEAEwDQYJKoZIhvcNAQELBQAwQzELMAkGA1UEBhMCVVMx
            EzARBgNVBAgTCkNhbGlmb3JuaWExEDAOBgNVBAoTB0V4YW1wbGUxDTALBgNVBAsT
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            TSqzqn0vzjJ78Mi6mN7/6L/onDKzROxClw0hc6L+PIhIHftD1ckvVQ==
            -----END CERTIFICATE-----""",

        """
            MIIFHDBOBgkqhkiG9w0BBQ0wQTApBgkqhkiG9w0BBQwwHAQIn/uWtEzLDK8CAggA
            MAwGCCqGSIb3DQIJBQAwFAYIKoZIhvcNAwcECIk7+JC4ErMDBIIEyA3yvNhMm/Oj
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            tG1GZkIlwM+jlJjRew05YQ==
            """),

    // Version: 3 (0x2)
    // Serial Number: 4098 (0x1002)
    // Signature Algorithm: sha256WithRSAEncryption
    // Issuer: C = US, ST = California, O = Example, OU = Test
    // Validity
    //     Not Before: Feb 25 20:31:29 2022 GMT
    //     Not After : Feb 19 20:31:29 2042 GMT
    // Subject: C = US, ST = California, O = Example, OU = Test, CN = www.example.com
    // Subject Public Key Info:
    //     Public Key Algorithm: rsaEncryption
    //         RSA Public-Key: (2048 bit)
    SERVER_EXAMPLE_RSA("RSA",
        """
            -----BEGIN CERTIFICATE-----
            MIIDaTCCAlGgAwIBAgICEAIwDQYJKoZIhvcNAQELBQAwQzELMAkGA1UEBhMCVVMx
            EzARBgNVBAgTCkNhbGlmb3JuaWExEDAOBgNVBAoTB0V4YW1wbGUxDTALBgNVBAsT
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            EWQ9pDW9+RC8l5DtRA==
            -----END CERTIFICATE-----""",

        """
            MIIEwAIBADANBgkqhkiG9w0BAQEFAASCBKowggSmAgEAAoIBAQDdytxHN5whXTwy
            6HqQDQK5Uqc+RTZssL7pulXv+IFngPeozA7xDTb6A/vWk82gBDWeyJ/FHiT2YFVg
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            """),


    // Version: 3 (0x2)
    // Serial Number: 4099 (0x1003)
    // Signature Algorithm: sha256WithRSAEncryption
    // Issuer: C = US, ST = California, O = Example, OU = Test
    // Validity
    //     Not Before: Feb 25 20:33:59 2022 GMT
    //     Not After : Feb 19 20:33:59 2042 GMT
    // Subject: C = US, ST = California, O = Example, OU = Test, CN = Do-Not-Reply
    // Subject Public Key Info:
    //     Public Key Algorithm: rsaEncryption
    //         RSA Public-Key: (2048 bit)
    CLIENT_EXAMPLE_RSA("RSA",
        """
            -----BEGIN CERTIFICATE-----
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            -----END CERTIFICATE-----""",

        """
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            EApUpF6yh6GEFvD9C71u/AYtd3zAHH/j1t3BG/AeXKP7W1U5RmsqtfacJKiaAlYI
            6eBtOTAJsop/Ja+v3DD1laC0Wq+w+orEU2ISgiWnAoGBAK9/9m3RCYPNYzS/PQ2B
            AgE2FQRuY8FXxHegZo2tBBwIojPeVHO1OoThYVNgiQfW9k27dFkRwXVAtt6Jqgax
            fvOby8rWRStXH2qHVyvHicceL7iXs6v2bX20Szsy44eMkoFfAImea6ZdErLdVWvI
            fxlYpTIVpBt3Nu2BRJn28ili
            """);

    final String keyAlgo;
    final String certStr;
    final String privateKeyStr;

    // Trusted certificate
    private final static SSLExampleCert[] TRUSTED_CERTS = {
            SSLExampleCert.CA_RSA
    };

    // Server certificate.
    private final static SSLExampleCert[] SERVER_CERTS = {
            SSLExampleCert.SERVER_EXAMPLE_RSA
    };

    // Client certificate.
    private final static SSLExampleCert[] CLIENT_CERTS = {
            SSLExampleCert.CLIENT_EXAMPLE_RSA
    };

    // Set "www.example.com" to loopback address.
    static {
        String hostsFileName = System.getProperty("jdk.net.hosts.file");
        String loopbackHostname =
                InetAddress.getLoopbackAddress().getHostAddress() +
                " " + "www.example.com    www.example.com.\n";
        try (FileWriter writer= new FileWriter(hostsFileName, false)) {
             writer.write(loopbackHostname);
        } catch (IOException ioe) {
             // ignore
        }
    }

    SSLExampleCert(String keyAlgo, String certStr, String privateKeyStr) {
        this.keyAlgo = keyAlgo;
        this.certStr = certStr;
        this.privateKeyStr = privateKeyStr;
    }

    public static SSLContext createClientSSLContext() throws Exception {
        return createSSLContext(TRUSTED_CERTS, CLIENT_CERTS);
    }

    public static SSLContext createServerSSLContext() throws Exception {
        return createSSLContext(TRUSTED_CERTS, SERVER_CERTS);
    }

    private static SSLContext createSSLContext(
            SSLExampleCert[] trustedCerts,
            SSLExampleCert[] endEntityCerts) throws Exception {
        char[] passphrase = "passphrase".toCharArray();

        // Generate certificate from cert string.
        CertificateFactory cf = CertificateFactory.getInstance("X.509");

        // Import the trusted certs.
        KeyStore ts = null;     // trust store
        if (trustedCerts != null && trustedCerts.length != 0) {
            ts = KeyStore.getInstance("PKCS12");
            ts.load(null, null);

            Certificate[] trustedCert = new Certificate[trustedCerts.length];
            for (int i = 0; i < trustedCerts.length; i++) {
                try (ByteArrayInputStream is = new ByteArrayInputStream(
                        trustedCerts[i].certStr.getBytes())) {
                    trustedCert[i] = cf.generateCertificate(is);
                }

                ts.setCertificateEntry("trusted-cert-" +
                        trustedCerts[i].name(), trustedCert[i]);
            }
        }

        // Import the key materials.
        KeyStore ks = null;     // trust store
        if (endEntityCerts != null && endEntityCerts.length != 0) {
            ks = KeyStore.getInstance("PKCS12");
            ks.load(null, null);

            for (SSLExampleCert endEntityCert : endEntityCerts) {
                // generate the private key.
                PKCS8EncodedKeySpec priKeySpec = new PKCS8EncodedKeySpec(
                        Base64.getMimeDecoder()
                                .decode(endEntityCert.privateKeyStr));
                KeyFactory kf =
                        KeyFactory.getInstance(
                                endEntityCert.keyAlgo);
                PrivateKey priKey = kf.generatePrivate(priKeySpec);

                // generate certificate chain
                Certificate keyCert;
                try (ByteArrayInputStream is = new ByteArrayInputStream(
                        endEntityCert.certStr.getBytes())) {
                    keyCert = cf.generateCertificate(is);
                }

                Certificate[] chain = new Certificate[]{keyCert};

                // import the key entry.
                ks.setKeyEntry("end-entity-cert-" +
                                endEntityCert.name(),
                        priKey, passphrase, chain);
            }
        }

        // Set the date for the verifying of certificates.
        DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
        Date verifyingDate = df.parse("02/02/2023");

        // Create an SSLContext object.
        TrustManagerFactory tmf =
                TrustManagerFactory.getInstance("PKIX");
        if (ts != null) {
            PKIXBuilderParameters pkixParams =
                    new PKIXBuilderParameters(ts, null);
            pkixParams.setDate(verifyingDate);
            pkixParams.setRevocationEnabled(false);
            ManagerFactoryParameters managerFactoryParameters =
                    new CertPathTrustManagerParameters(pkixParams);
            tmf.init(managerFactoryParameters);
        } else {
            tmf.init((KeyStore)null);
        }

        SSLContext context = SSLContext.getInstance("TLS");
        if (endEntityCerts != null && endEntityCerts.length != 0) {
            KeyManagerFactory kmf =
                    KeyManagerFactory.getInstance("NewSunX509");
            kmf.init(ks, passphrase);

            KeyManager[] kms = kmf.getKeyManagers();
            if (kms != null && kms.length != 0) {
                KeyManager km = kms[0];
                Field verificationDateField =
                        km.getClass().getDeclaredField("verificationDate");
                verificationDateField.setAccessible(true);
                verificationDateField.set(km, verifyingDate);
            }

            context.init(kms, tmf.getTrustManagers(), null);
        } else {
            context.init(null, tmf.getTrustManagers(), null);
        }

        return context;
    }
}