public AuthenticatorWindow() {
    SESecurityManager.addPasswordListener(this);

    // System.out.println( "AuthenticatorWindow");

    Map cache = COConfigurationManager.getMapParameter(CONFIG_PARAM, new HashMap());

    try {
      Iterator it = cache.entrySet().iterator();

      while (it.hasNext()) {

        Map.Entry entry = (Map.Entry) it.next();

        String key = (String) entry.getKey();
        Map value = (Map) entry.getValue();

        String user = new String((byte[]) value.get("user"), "UTF-8");
        char[] pw = new String((byte[]) value.get("pw"), "UTF-8").toCharArray();

        auth_cache.put(key, new authCache(key, new PasswordAuthentication(user, pw), true));
      }

    } catch (Throwable e) {

      COConfigurationManager.setParameter(CONFIG_PARAM, new HashMap());

      Debug.printStackTrace(e);
    }
  }
  protected String[] getAuthenticationDialog(final String realm, final String tracker) {
    final Display display = SWTThread.getInstance().getDisplay();

    if (display.isDisposed()) {

      return (null);
    }

    final AESemaphore sem = new AESemaphore("SWTAuth");

    final authDialog[] dialog = new authDialog[1];

    TOTorrent torrent = TorrentUtils.getTLSTorrent();

    final String torrent_name;

    if (torrent == null) {

      torrent_name = null;

    } else {

      torrent_name = TorrentUtils.getLocalisedName(torrent);
    }

    try {
      display.asyncExec(
          new AERunnable() {
            public void runSupport() {
              dialog[0] = new authDialog(sem, display, realm, tracker, torrent_name);
            }
          });
    } catch (Throwable e) {

      Debug.printStackTrace(e);

      return (null);
    }
    sem.reserve();

    String user = dialog[0].getUsername();
    String pw = dialog[0].getPassword();
    String persist = dialog[0].savePassword() ? "true" : "false";

    if (user == null) {

      return (null);
    }

    return (new String[] {user, pw == null ? "" : pw, persist});
  }
  protected void saveAuthCache() {
    try {
      this_mon.enter();

      HashMap map = new HashMap();

      Iterator it = auth_cache.values().iterator();

      while (it.hasNext()) {

        authCache value = (authCache) it.next();

        if (value.isPersistent()) {

          try {
            HashMap entry_map = new HashMap();

            entry_map.put("user", value.getAuth().getUserName().getBytes("UTF-8"));
            entry_map.put("pw", new String(value.getAuth().getPassword()).getBytes("UTF-8"));

            map.put(value.getKey(), entry_map);

          } catch (Throwable e) {

            Debug.printStackTrace(e);
          }
        }
      }

      COConfigurationManager.setParameter(CONFIG_PARAM, map);

    } finally {

      this_mon.exit();
    }
  }
    protected authDialog(
        AESemaphore _sem,
        Display display,
        String realm,
        boolean is_tracker,
        String target,
        String details) {
      sem = _sem;

      if (display.isDisposed()) {

        sem.releaseForever();

        return;
      }

      final String ignore_key = "IgnoreAuth:" + realm + ":" + target + ":" + details;

      if (RememberedDecisionsManager.getRememberedDecision(ignore_key) == 1) {

        Debug.out(
            "Authentication for "
                + realm
                + "/"
                + target
                + "/"
                + details
                + " ignored as told not to ask again");

        sem.releaseForever();

        return;
      }

      shell = ShellFactory.createMainShell(SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);

      Utils.setShellIcon(shell);
      Messages.setLanguageText(shell, "authenticator.title");

      GridLayout layout = new GridLayout();
      layout.numColumns = 3;

      shell.setLayout(layout);

      GridData gridData;

      // realm

      Label realm_label = new Label(shell, SWT.NULL);
      Messages.setLanguageText(realm_label, "authenticator.realm");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      realm_label.setLayoutData(gridData);

      Label realm_value = new Label(shell, SWT.NULL);
      realm_value.setText(realm.replaceAll("&", "&&"));
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 2;
      realm_value.setLayoutData(gridData);

      // target

      Label target_label = new Label(shell, SWT.NULL);
      Messages.setLanguageText(
          target_label, is_tracker ? "authenticator.tracker" : "authenticator.location");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      target_label.setLayoutData(gridData);

      Label target_value = new Label(shell, SWT.NULL);
      target_value.setText(target.replaceAll("&", "&&"));
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 2;
      target_value.setLayoutData(gridData);

      if (details != null) {

        Label details_label = new Label(shell, SWT.NULL);
        Messages.setLanguageText(
            details_label, is_tracker ? "authenticator.torrent" : "authenticator.details");
        gridData = new GridData(GridData.FILL_BOTH);
        gridData.horizontalSpan = 1;
        details_label.setLayoutData(gridData);

        Label details_value = new Label(shell, SWT.NULL);
        details_value.setText(details.replaceAll("&", "&&"));
        gridData = new GridData(GridData.FILL_BOTH);
        gridData.horizontalSpan = 2;
        details_value.setLayoutData(gridData);
      }
      // user

      Label user_label = new Label(shell, SWT.NULL);
      Messages.setLanguageText(user_label, "authenticator.user");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      user_label.setLayoutData(gridData);

      final Text user_value = new Text(shell, SWT.BORDER);
      user_value.setText("");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 2;
      user_value.setLayoutData(gridData);

      user_value.addListener(
          SWT.Modify,
          new Listener() {
            public void handleEvent(Event event) {
              username = user_value.getText();
            }
          });

      // password

      Label password_label = new Label(shell, SWT.NULL);
      Messages.setLanguageText(password_label, "authenticator.password");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      password_label.setLayoutData(gridData);

      final Text password_value = new Text(shell, SWT.BORDER);
      password_value.setEchoChar('*');
      password_value.setText("");
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 2;
      password_value.setLayoutData(gridData);

      password_value.addListener(
          SWT.Modify,
          new Listener() {
            public void handleEvent(Event event) {
              password = password_value.getText();
            }
          });

      // persist

      Label blank_label = new Label(shell, SWT.NULL);
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      blank_label.setLayoutData(gridData);

      final Button checkBox = new Button(shell, SWT.CHECK);
      checkBox.setText(MessageText.getString("authenticator.savepassword"));
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      checkBox.setLayoutData(gridData);
      checkBox.addListener(
          SWT.Selection,
          new Listener() {
            public void handleEvent(Event e) {
              persist = checkBox.getSelection();
            }
          });

      final Button dontAsk = new Button(shell, SWT.CHECK);
      dontAsk.setText(MessageText.getString("general.dont.ask.again"));
      gridData = new GridData(GridData.FILL_BOTH);
      gridData.horizontalSpan = 1;
      dontAsk.setLayoutData(gridData);
      dontAsk.addListener(
          SWT.Selection,
          new Listener() {
            public void handleEvent(Event e) {
              RememberedDecisionsManager.setRemembered(ignore_key, dontAsk.getSelection() ? 1 : 0);
            }
          });

      // line

      Label labelSeparator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
      gridData = new GridData(GridData.FILL_HORIZONTAL);
      gridData.horizontalSpan = 3;
      labelSeparator.setLayoutData(gridData);

      // buttons

      new Label(shell, SWT.NULL);

      Button bOk = new Button(shell, SWT.PUSH);
      Messages.setLanguageText(bOk, "Button.ok");
      gridData =
          new GridData(
              GridData.FILL_HORIZONTAL
                  | GridData.HORIZONTAL_ALIGN_END
                  | GridData.HORIZONTAL_ALIGN_FILL);
      gridData.grabExcessHorizontalSpace = true;
      gridData.widthHint = 70;
      bOk.setLayoutData(gridData);
      bOk.addListener(
          SWT.Selection,
          new Listener() {
            public void handleEvent(Event e) {
              close(true);
            }
          });

      Button bCancel = new Button(shell, SWT.PUSH);
      Messages.setLanguageText(bCancel, "Button.cancel");
      gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
      gridData.grabExcessHorizontalSpace = false;
      gridData.widthHint = 70;
      bCancel.setLayoutData(gridData);
      bCancel.addListener(
          SWT.Selection,
          new Listener() {
            public void handleEvent(Event e) {
              close(false);
            }
          });

      shell.setDefaultButton(bOk);

      shell.addListener(
          SWT.Traverse,
          new Listener() {
            public void handleEvent(Event e) {
              if (e.character == SWT.ESC) {
                close(false);
              }
            }
          });

      shell.pack();

      Utils.centreWindow(shell);

      shell.open();
    }
  protected String[] getAuthenticationDialog(final String realm, final String location) {
    final Display display = SWTThread.getInstance().getDisplay();

    if (display.isDisposed()) {

      return (null);
    }

    final AESemaphore sem = new AESemaphore("SWTAuth");

    final authDialog[] dialog = new authDialog[1];

    TOTorrent torrent = TorrentUtils.getTLSTorrent();

    final boolean is_tracker;
    final String details;

    if (torrent == null) {

      is_tracker = false;

      details = TorrentUtils.getTLSDescription();

    } else {

      details = TorrentUtils.getLocalisedName(torrent);
      is_tracker = true;
    }

    try {
      if (display.getThread() == Thread.currentThread()) {

        dialog[0] = new authDialog(sem, display, realm, is_tracker, location, details);

        while (!(display.isDisposed() || sem.isReleasedForever())) {

          if (!display.readAndDispatch()) {

            display.sleep();
          }
        }

        if (display.isDisposed()) {

          return (null);
        }
      } else {

        display.asyncExec(
            new AERunnable() {
              public void runSupport() {
                dialog[0] = new authDialog(sem, display, realm, is_tracker, location, details);
              }
            });
      }
    } catch (Throwable e) {

      Debug.printStackTrace(e);

      return (null);
    }

    sem.reserve();

    String user = dialog[0].getUsername();
    String pw = dialog[0].getPassword();
    String persist = dialog[0].savePassword() ? "true" : "false";

    if (user == null) {

      return (null);
    }

    return (new String[] {user, pw == null ? "" : pw, persist});
  }
  public PasswordAuthentication getAuthentication(
      String realm, String protocol, String host, int port) {
    try {
      this_mon.enter();

      String tracker = protocol + "://" + host + ":" + port + "/";

      InetAddress bind_ip = NetworkAdmin.getSingleton().getSingleHomedServiceBindAddress();

      String self_addr;

      // System.out.println( "auth req for " + realm + " - " + tracker );

      if (bind_ip == null || bind_ip.isAnyLocalAddress()) {

        self_addr = "127.0.0.1";

      } else {

        self_addr = bind_ip.getHostAddress();
      }

      // when the tracker is connected to internally we don't want to prompt
      // for the password. Here we return a special user and the password hash
      // which is picked up in the tracker auth code - search for "<internal>"!

      // also include the tracker IP as well as for scrapes these can occur on
      // a raw torrent which hasn't been modified to point to localhost

      if (host.equals(self_addr)
          || host.equals(COConfigurationManager.getStringParameter("Tracker IP", ""))) {

        try {
          byte[] pw = COConfigurationManager.getByteParameter("Tracker Password", new byte[0]);

          String str_pw = new String(Base64.encode(pw));

          return (new PasswordAuthentication("<internal>", str_pw.toCharArray()));

        } catch (Throwable e) {

          Debug.printStackTrace(e);
        }
      }

      String auth_key = realm + ":" + tracker;

      authCache cache = (authCache) auth_cache.get(auth_key);

      if (cache != null) {

        PasswordAuthentication auth = cache.getAuth();

        if (auth != null) {

          return (auth);
        }
      }

      String[] res = getAuthenticationDialog(realm, tracker);

      if (res == null) {

        return (null);

      } else {

        PasswordAuthentication auth = new PasswordAuthentication(res[0], res[1].toCharArray());

        boolean save_pw = res[2].equals("true");

        boolean old_entry_existed =
            auth_cache.put(auth_key, new authCache(auth_key, auth, save_pw)) != null;

        if (save_pw || old_entry_existed) {

          saveAuthCache();
        }

        return (auth);
      }
    } finally {

      this_mon.exit();
    }
  }