source: josm/src/org/openstreetmap/josm/io/OsmConnection.java@ 104

package org.openstreetmap.josm.io;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.Font;
import java.awt.GridBagLayout;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;

import javax.swing.BoundedRangeModel;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.tools.GBC;

/**
 * Base class that handles common things like authentication for the reader and writer
 * to the osm server.
 * 
 * @author imi
 */
public class OsmConnection {

        public static class OsmParseException extends Exception {
                public OsmParseException() {super();}
                public OsmParseException(String message, Throwable cause) {super(message, cause);}
                public OsmParseException(String message) {super(message);}
                public OsmParseException(Throwable cause) {super(cause);}
        }
        
        protected boolean cancel = false;
        protected HttpURLConnection activeConnection;
        protected JLabel currentAction;
        protected BoundedRangeModel progress;

        private static OsmAuth authentication;
        /**
         * Initialize the http defaults and the authenticator.
         */
        static {
                HttpURLConnection.setFollowRedirects(true);
                Authenticator.setDefault(authentication = new OsmAuth());
        }

        /**
         * The authentication class handling the login requests.
         */
        private static class OsmAuth extends Authenticator {
                /**
                 * Set to true, when the autenticator tried the password once.
                 */
                boolean passwordtried = false;
                /**
                 * Whether the user cancelled the password dialog
                 */
                boolean authCancelled = false;

                @Override protected PasswordAuthentication getPasswordAuthentication() {
                        String username = Main.pref.get("osm-server.username");
                        String password = Main.pref.get("osm-server.password");
                        if (passwordtried || username.equals("") || password.equals("")) {
                                JPanel p = new JPanel(new GridBagLayout());
                                if (!username.equals("") && !password.equals(""))
                                        p.add(new JLabel(tr("Incorrect password or username.")), GBC.eop());
                                p.add(new JLabel(tr("Username")), GBC.std().insets(0,0,10,0));
                                JTextField usernameField = new JTextField(username, 20);
                                p.add(usernameField, GBC.eol());
                                p.add(new JLabel(tr("Password")), GBC.std().insets(0,0,10,0));
                                JPasswordField passwordField = new JPasswordField(password, 20);
                                p.add(passwordField, GBC.eol());
                                JLabel warning = new JLabel(tr("Warning: The password is transferred unencrypted."));
                                warning.setFont(warning.getFont().deriveFont(Font.ITALIC));
                                p.add(warning, GBC.eop());

                                JCheckBox savePassword = new JCheckBox(tr("Save user and password (unencrypted)"), !username.equals("") && !password.equals(""));
                                p.add(savePassword, GBC.eop());

                                int choice = JOptionPane.showConfirmDialog(Main.parent, p, tr("Enter Password"), JOptionPane.OK_CANCEL_OPTION);
                                if (choice == JOptionPane.CANCEL_OPTION) {
                                        authCancelled = true;
                                        return null;
                                }
                                username = usernameField.getText();
                                password = String.valueOf(passwordField.getPassword());
                                if (savePassword.isSelected()) {
                                        Main.pref.put("osm-server.username", username);
                                        Main.pref.put("osm-server.password", password);
                                }
                                if (username.equals(""))
                                        return null;
                        }
                        passwordtried = true;
                        return new PasswordAuthentication(username, password.toCharArray());
                }
        }

        /**
         * Must be called before each connection attemp to initialize the authentication.
         */
        protected final void initAuthentication() {
                authentication.authCancelled = false;
                authentication.passwordtried = false;
        }

        /**
         * @return Whether the connection was cancelled.
         */
        protected final boolean isAuthCancelled() {
                return authentication.authCancelled;
        }

        public void setProgressInformation(JLabel currentAction, BoundedRangeModel progress) {
                this.currentAction = currentAction;
                this.progress = progress;
        }

        public void cancel() {
                currentAction.setText(tr("Aborting..."));
                cancel = true;
                if (activeConnection != null) {
                        activeConnection.setConnectTimeout(1);
                        activeConnection.setReadTimeout(1);
                        activeConnection.disconnect();
                }
        }
}