package at.gv.egiz.bku.webstart;

import at.gv.egiz.bku.utils.StreamUtil;
import java.awt.AWTPermission;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilePermission;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.ReflectPermission;
import java.net.NetPermission;
import java.net.SocketPermission;
import java.security.AllPermission;
import java.security.KeyStore;
import java.security.Permissions;
import java.security.SecurityPermission;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.util.PropertyPermission;
import javax.smartcardio.CardPermission;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.security.SslSocketConnector;
import org.mortbay.jetty.webapp.WebAppContext;
import org.mortbay.thread.QueuedThreadPool;

public class Container {

  public static final String HTTP_PORT_PROPERTY = "mocca.http.port";
  public static final String HTTPS_PORT_PROPERTY = "mocca.http.port";
  public static final String SERVER_CA_CERTIFICATE_ATTRIBUTE = "mocca.tls.server.ca.certificate";
  private static Log log = LogFactory.getLog(Container.class);

  static {
    if (log.isDebugEnabled()) {
      //Jetty log INFO and WARN, include ignored exceptions
      //jetty logging may be further restricted by setting level in log4j.properties
      System.setProperty("VERBOSE", "true");
      //do not set Jetty DEBUG logging, produces loads of output
      //System.setProperty("DEBUG", "true");
    }
  }
  private Server server;

  public void init() throws IOException {
//    System.setProperty("DEBUG", "true");
    server = new Server();
    QueuedThreadPool qtp = new QueuedThreadPool();
    qtp.setMaxThreads(5);
    qtp.setMinThreads(2);
    qtp.setLowThreads(0);
    server.setThreadPool(qtp);
    server.setStopAtShutdown(true);
    server.setGracefulShutdown(3000);

    SelectChannelConnector connector = new SelectChannelConnector();
    connector.setPort(Integer.getInteger(HTTP_PORT_PROPERTY, 3495).intValue());
    connector.setAcceptors(1);
    connector.setConfidentialPort(Integer.getInteger(HTTPS_PORT_PROPERTY, 3496).intValue());
    connector.setHost("127.0.0.1");

    SslSocketConnector sslConnector = new SslSocketConnector();
    sslConnector.setPort(Integer.getInteger(HTTPS_PORT_PROPERTY, 3496).intValue());
    sslConnector.setAcceptors(1);
    sslConnector.setHost("127.0.0.1");
    File configDir = new File(System.getProperty("user.home") + "/" + Configurator.CONFIG_DIR);
    File keystoreFile = new File(configDir, Configurator.KEYSTORE_FILE);
    if (!keystoreFile.canRead()) {
      log.error("MOCCA keystore file not readable: " + keystoreFile.getAbsolutePath());
      throw new FileNotFoundException("MOCCA keystore file not readable: " + keystoreFile.getAbsolutePath());
    }
    log.debug("loading MOCCA keystore from " + keystoreFile.getAbsolutePath());
    sslConnector.setKeystore(keystoreFile.getAbsolutePath());
    String passwd = readPassword(new File(configDir, Configurator.PASSWD_FILE));
    sslConnector.setPassword(passwd);
    sslConnector.setKeyPassword(passwd);

    //avoid jetty's ClassCastException: iaik.security.ecc.ecdsa.ECPublicKey cannot be cast to java.security.interfaces.ECPublicKey
    String[] RFC4492CipherSuites = new String[]{
      "TLS_ECDH_ECDSA_WITH_NULL_SHA",
      "TLS_ECDH_ECDSA_WITH_RC4_128_SHA",
      "TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA",
      "TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA",
      "TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA",
      "TLS_ECDHE_ECDSA_WITH_NULL_SHA",
      "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
      "TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA",
      "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
      "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
      "TLS_ECDH_RSA_WITH_NULL_SHA",
      "TLS_ECDH_RSA_WITH_RC4_128_SHA",
      "TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA",
      "TLS_ECDH_RSA_WITH_AES_128_CBC_SHA",
      "TLS_ECDH_RSA_WITH_AES_256_CBC_SHA",
      "TLS_ECDHE_RSA_WITH_NULL_SHA",
      "TLS_ECDHE_RSA_WITH_RC4_128_SHA",
      "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
      "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
      "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
      "TLS_ECDH_anon_WITH_NULL_SHA",
      "TLS_ECDH_anon_WITH_RC4_128_SHA",
      "TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA",
      "TLS_ECDH_anon_WITH_AES_128_CBC_SHA",
      "TLS_ECDH_anon_WITH_AES_256_CBC_SHA"
    };

    sslConnector.setExcludeCipherSuites(RFC4492CipherSuites);

    server.setConnectors(new Connector[]{connector, sslConnector});

    WebAppContext webapp = new WebAppContext();
    webapp.setLogUrlOnStart(true);
    webapp.setContextPath("/");
    webapp.setExtractWAR(true);
    webapp.setParentLoaderPriority(false);

    try {
      // no way to get certificate from within the servlet (SSLEngine/Jetty SSLSocketConnector/SSLContext?)
      if (log.isTraceEnabled()) {
        log.trace("local ca certificate from " + keystoreFile + " in webapp context at " + SERVER_CA_CERTIFICATE_ATTRIBUTE);
      }
      BufferedInputStream bis = new BufferedInputStream(new FileInputStream(keystoreFile));
      KeyStore sslKeyStore = KeyStore.getInstance("JKS");
      sslKeyStore.load(bis, passwd.toCharArray());
      Certificate[] sslChain = sslKeyStore.getCertificateChain(TLSServerCA.MOCCA_TLS_SERVER_ALIAS);
      webapp.setAttribute(SERVER_CA_CERTIFICATE_ATTRIBUTE, sslChain[sslChain.length - 1]);
      bis.close();
    } catch (Exception ex) {
      log.error("Failed to load local ca certificate", ex);
      log.warn("automated web certificate installation will not be available");
    }

    webapp.setWar(copyWebapp(webapp.getTempDirectory()));
    webapp.setPermissions(getPermissions(webapp.getTempDirectory()));

    server.setHandler(webapp);
    server.setGracefulShutdown(1000 * 3);
  }

  /**
   * @return The first valid (not empty, no comment) line of the passwd file
   * @throws IOException
   */
  protected static String readPassword(File passwdFile) throws IOException {
    if (passwdFile.exists() && passwdFile.canRead()) {
      BufferedReader passwdReader = null;
      try {
        passwdReader = new BufferedReader(new FileReader(passwdFile));
        String passwd;
        while ((passwd = passwdReader.readLine().trim()) != null) {
          if (passwd.length() > 0 && !passwd.startsWith("#")) {
            return passwd;
          }
        }
      } catch (IOException ex) {
        log.error("failed to read password from " + passwdFile, ex);
        throw ex;
      } finally {
        try {
          passwdReader.close();
        } catch (IOException ex) {
        }
      }
    }
    throw new IOException(passwdFile + " not readable");
  }

  private String copyWebapp(File webappDir) throws IOException {
    File webapp = new File(webappDir, "BKULocal.war");
    log.debug("copying BKULocal classpath resource to " + webapp);
    InputStream is = getClass().getClassLoader().getResourceAsStream("BKULocal.war");
    OutputStream os = new BufferedOutputStream(new FileOutputStream(webapp));
    StreamUtil.copyStream(is, os);
    os.close();
    return webapp.getPath();
  }

  private Permissions getPermissions(File webappDir) {
    Permissions perms = new Permissions();
    perms.add(new AllPermission());


    if (false) {

      // jetty-webstart (spring?)
      perms.add(new RuntimePermission("getClassLoader"));

      // standard permissions
      perms.add(new PropertyPermission("*", "read,write"));
      perms.add(new RuntimePermission("accessDeclaredMembers"));
      perms.add(new RuntimePermission("accessClassInPackage.*"));
      perms.add(new RuntimePermission("defineClassInPackage.*"));
      perms.add(new RuntimePermission("setFactory"));
      perms.add(new RuntimePermission("getProtectionDomain"));
      perms.add(new RuntimePermission("modifyThread"));
      perms.add(new RuntimePermission("modifyThreadGroup"));
      perms.add(new RuntimePermission("setFactory"));
      perms.add(new ReflectPermission("suppressAccessChecks"));

      // MOCCA specific
      perms.add(new SocketPermission("*", "connect,resolve"));
      perms.add(new NetPermission("specifyStreamHandler"));
      perms.add(new SecurityPermission("insertProvider.*"));
      perms.add(new SecurityPermission("putProviderProperty.*"));
      perms.add(new SecurityPermission("removeProvider.*"));
      perms.add(new CardPermission("*", "*"));
      perms.add(new AWTPermission("*"));

      perms.add(new FilePermission(webappDir.getAbsolutePath() + "/-", "read"));
      perms.add(new FilePermission(new File(System.getProperty("java.home") + "/lib/xalan.properties").getAbsolutePath(), "read"));
      perms.add(new FilePermission(new File(System.getProperty("java.home") + "/lib/xerces.properties").getAbsolutePath(), "read"));
      perms.add(new FilePermission(new File(System.getProperty("user.home")).getAbsolutePath(), "read, write"));
      perms.add(new FilePermission(new File(System.getProperty("user.home") + "/-").getAbsolutePath(), "read, write"));
      perms.add(new FilePermission(new File(System.getProperty("user.home") + "/.mocca/logs/*").getAbsolutePath(), "read, write,delete"));
      perms.add(new FilePermission(new File(System.getProperty("user.home") + "/.mocca/certs/-").getAbsolutePath(), "read, write,delete"));

      //TODO
//    log.trace("granting file read/write permission to MOCCA local");
//    perms.add(new FilePermission("<<ALL FILES>>", "read, write"));

    }
    return perms;
  }

  public void start() throws Exception {
    server.start();
  }

  public boolean isRunning() {
    return server.isRunning();
  }

  public void stop() throws Exception {
    server.stop();
  }

  public void destroy() {
    server.destroy();
  }

  public void join() throws InterruptedException {
    server.join();
  }
}