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package javax.management.remote.rest;

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import javax.management.MBeanServer;

import javax.net.ssl.KeyManagerFactory;

import javax.net.ssl.SSLContext;

import javax.net.ssl.TrustManagerFactory;

import java.io.BufferedInputStream;

import java.io.FileInputStream;

import java.io.IOException;

import java.lang.management.ManagementFactory;

import java.net.InetSocketAddress;

import java.security.KeyStore;

import java.util.*;

/**

 * @author harsha

 */

public class PlatformRestAdapter {

    private static final Set<String> contextList = new HashSet<>();

    /*

     * Initializes HTTPServer with settings from config file

     * acts as container for platform rest adapter

     */

    private static HttpServer httpServer = null;

    private static JmxRestAdapter instance = null;

    private PlatformRestAdapter() {

    }

    public static synchronized void init(String portStr, Properties props) throws IOException {

        if (instance == null) {

            final int port;

            try {

                port = Integer.parseInt(portStr);

            } catch (NumberFormatException x) {

                throw new IllegalArgumentException("Invalid string for port");

            }

            if (port < 0) {

                throw new IllegalArgumentException("Invalid string for port");

            }

            boolean useSSL = Boolean.parseBoolean((String) props.get("com.sun.management.jmxremote.ssl"));

            if (useSSL) {

                final String sslConfigFileName

                        = props.getProperty(PropertyNames.SSL_CONFIG_FILE_NAME);

                SSLContext ctx = getSSlContext(sslConfigFileName);

                if (ctx != null) {

                    HttpsServer server = HttpsServer.create(new InetSocketAddress(port), 0);

                    server.setHttpsConfigurator(new HttpsConfigurator(ctx));

                    httpServer = server;

                } else {

                    httpServer = HttpServer.create(new InetSocketAddress(port), 0);

                }

            } else {

                httpServer = HttpServer.create(new InetSocketAddress(port), 0);

            }

            // Initialize rest adapter

            Map<String, Object> env = new HashMap<>();

            // Do we use authentication?

            final String useAuthenticationStr

                    = props.getProperty(PropertyNames.USE_AUTHENTICATION,

                            DefaultValues.USE_AUTHENTICATION);

            final boolean useAuthentication

                    = Boolean.valueOf(useAuthenticationStr);

            String loginConfigName;

            String passwordFileName;

            if (useAuthentication) {

                env.put("jmx.remote.x.authentication", Boolean.TRUE);

                // Get non-default login configuration

                loginConfigName

                        = props.getProperty(PropertyNames.LOGIN_CONFIG_NAME);

                env.put("jmx.remote.x.login.config", loginConfigName);

                if (loginConfigName == null) {

                    // Get password file

                    passwordFileName

                            = props.getProperty(PropertyNames.PASSWORD_FILE_NAME);

                    env.put("jmx.remote.x.password.file", passwordFileName);

                }

            }

            instance = new JmxRestAdapterImpl(httpServer, "default", env, ManagementFactory.getPlatformMBeanServer());

            httpServer.start();

        }

    }

    public static void stop() {

        if (instance != null) {

            instance.stop();

            instance = null;

        }

        if (httpServer != null) {

            httpServer.stop(0);

            httpServer = null;

        }

    }

    private static SSLContext getSSlContext(String sslConfigFileName) {

        final String keyStore, keyStorePassword, trustStore, trustStorePassword;

        try {

            if (sslConfigFileName == null || sslConfigFileName.isEmpty()) {

                keyStore = System.getProperty(PropertyNames.SSL_KEYSTORE_FILE);

                keyStorePassword = System.getProperty(PropertyNames.SSL_KEYSTORE_PASSWORD);

                trustStore = System.getProperty(PropertyNames.SSL_TRUSTSTORE_FILE);

                trustStorePassword = System.getProperty(PropertyNames.SSL_TRUSTSTORE_PASSWORD);

            } else {

                Properties p = new Properties();

                BufferedInputStream bin = new BufferedInputStream(new FileInputStream(sslConfigFileName));

                p.load(bin);

                keyStore = p.getProperty(PropertyNames.SSL_KEYSTORE_FILE);

                keyStorePassword = p.getProperty(PropertyNames.SSL_KEYSTORE_PASSWORD);

                trustStore = p.getProperty(PropertyNames.SSL_TRUSTSTORE_FILE);

                trustStorePassword = p.getProperty(PropertyNames.SSL_TRUSTSTORE_PASSWORD);

            }

            char[] keyStorePasswd = null;

            if (keyStorePassword.length() != 0) {

                keyStorePasswd = keyStorePassword.toCharArray();

            }

            char[] trustStorePasswd = null;

            if (trustStorePassword.length() != 0) {

                trustStorePasswd = trustStorePassword.toCharArray();

            }

            KeyStore ks = null;

            if (keyStore != null) {

                ks = KeyStore.getInstance(KeyStore.getDefaultType());

                FileInputStream ksfis = new FileInputStream(keyStore);

                ks.load(ksfis, keyStorePasswd);

            }

            KeyManagerFactory kmf = KeyManagerFactory.getInstance(

                    KeyManagerFactory.getDefaultAlgorithm());

            kmf.init(ks, keyStorePasswd);

            KeyStore ts = null;

            if (trustStore != null) {

                ts = KeyStore.getInstance(KeyStore.getDefaultType());

                FileInputStream tsfis = new FileInputStream(trustStore);

                ts.load(tsfis, trustStorePasswd);

            }

            TrustManagerFactory tmf = TrustManagerFactory.getInstance(

                    TrustManagerFactory.getDefaultAlgorithm());

            tmf.init(ts);

            SSLContext ctx = SSLContext.getInstance("SSL");

            ctx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);

            return ctx;

        } catch (Exception ex) {

        }

        return null;

    }

    public static JmxRestAdapter getInstance() {

        if (instance == null) {

            throw new IllegalStateException("PlatformRestAdapter not initialized");

        }

        return instance;

    }

    public static synchronized JmxRestAdapter newRestAdapter(String context, Map<String, ?> env, MBeanServer mbeanServer) {

        if (!contextList.contains(context)) {

            contextList.add(context);

            return new JmxRestAdapterImpl(httpServer, context, env, mbeanServer);

        }

        throw new IllegalArgumentException(context + " is already taken");

    }

    /**

     * Default values for JMX configuration properties.

     */

    public static interface DefaultValues {

        public static final String PORT = "0";

        public static final String CONFIG_FILE_NAME = "management.properties";

        public static final String USE_SSL = "true";

        public static final String USE_LOCAL_ONLY = "true";

        public static final String USE_REGISTRY_SSL = "false";

        public static final String USE_AUTHENTICATION = "true";

        public static final String PASSWORD_FILE_NAME = "jmxremote.password";

        public static final String ACCESS_FILE_NAME = "jmxremote.access";

        public static final String SSL_NEED_CLIENT_AUTH = "false";

    }

    /**

     * Names of JMX configuration properties.

     */

    public static interface PropertyNames {

        public static final String PORT

                = "com.sun.management.jmxremote.rest.port";

        public static final String HOST

                = "com.sun.management.jmxremote.host";

        public static final String USE_SSL

                = "com.sun.management.jmxremote.ssl";

        public static final String USE_AUTHENTICATION

                = "com.sun.management.jmxremote.authenticate";

        public static final String PASSWORD_FILE_NAME

                = "com.sun.management.jmxremote.password.file";

        public static final String LOGIN_CONFIG_NAME

                = "com.sun.management.jmxremote.login.config";

        public static final String SSL_NEED_CLIENT_AUTH

                = "com.sun.management.jmxremote.ssl.need.client.auth";

        public static final String SSL_CONFIG_FILE_NAME

                = "com.sun.management.jmxremote.ssl.config.file";

        public static final String SSL_KEYSTORE_FILE

                = "javax.net.ssl.keyStore";

        public static final String SSL_TRUSTSTORE_FILE

                = "javax.net.ssl.trustStore";

        public static final String SSL_KEYSTORE_PASSWORD

                = "javax.net.ssl.keyStorePassword";

        public static final String SSL_TRUSTSTORE_PASSWORD

                = "javax.net.ssl.trustStorePassword";

    }

}