Java tutorial
/******************************************************************************* * Copyright (C) 2007 The University of Manchester * * Modifications to the initial code base are copyright of their * respective authors, or their employers as appropriate. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This program 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 ******************************************************************************/ package net.sf.taverna.t2.workbench.file.impl.actions; import static java.awt.EventQueue.invokeLater; import static javax.swing.JOptionPane.ERROR_MESSAGE; import static javax.swing.JOptionPane.showMessageDialog; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import net.sf.taverna.t2.workbench.helper.HelpEnabledDialog; import org.apache.commons.codec.binary.Base64; import org.apache.log4j.Logger; /** * Simple dialogue to handle username/password input for workflow URL requiring * http authentication. * * @author Stuart Owen * @author Stian Soiland-Reyes * @author Alan R Williams */ @SuppressWarnings("serial") public class PasswordInput extends HelpEnabledDialog { private static Logger logger = Logger.getLogger(PasswordInput.class); private String password = null; private String username = null; private URL url = null; private int tryCount = 0; private final static int MAX_TRIES = 3; private JButton cancelButton; private JLabel jLabel1; private JLabel jLabel2; private JLabel messageLabel; private JButton okButton; private JPasswordField passwordTextField; private JLabel urlLabel; private JTextField usernameTextField; public void setUrl(URL url) { this.url = url; urlLabel.setText(url.toExternalForm()); } public String getPassword() { return password; } public String getUsername() { return username; } public PasswordInput(JFrame parent) { super(parent, "Authorization", true, null); initComponents(); } /** Creates new form PasswordInput */ public PasswordInput() { super((JFrame) null, "Authorization", true, null); initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ private void initComponents() { usernameTextField = new javax.swing.JTextField(); cancelButton = new javax.swing.JButton(); okButton = new javax.swing.JButton(); passwordTextField = new javax.swing.JPasswordField(); jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); messageLabel = new javax.swing.JLabel(); urlLabel = new javax.swing.JLabel(); getContentPane().setLayout(null); setModal(true); // setResizable(false); getContentPane().add(usernameTextField); usernameTextField.setBounds(20, 80, 280, 22); cancelButton.setText("Cancel"); cancelButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent evt) { cancelButtonActionPerformed(evt); } }); getContentPane().add(cancelButton); cancelButton.setBounds(230, 160, 75, 29); okButton.setText("OK"); okButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent evt) { okButtonActionPerformed(evt); } }); getContentPane().add(okButton); okButton.setBounds(150, 160, 75, 29); getContentPane().add(passwordTextField); passwordTextField.setBounds(20, 130, 280, 22); jLabel1.setText("Username"); getContentPane().add(jLabel1); jLabel1.setBounds(20, 60, 70, 16); jLabel2.setText("Password"); getContentPane().add(jLabel2); jLabel2.setBounds(20, 110, 70, 16); messageLabel.setText("A username and password is required for:"); getContentPane().add(messageLabel); messageLabel.setBounds(20, 10, 270, 20); urlLabel.setText("service"); getContentPane().add(urlLabel); urlLabel.setBounds(20, 30, 270, 16); pack(); } private void okButtonActionPerformed(ActionEvent evt) {//GEN-FIRST:event_okButtonActionPerformed String password = String.valueOf(passwordTextField.getPassword()); String username = usernameTextField.getText(); HttpURLConnection connection; try { connection = (HttpURLConnection) url.openConnection(); String userPassword = username + ":" + password; /* * Note: non-latin1 support for basic auth is fragile/unsupported * and must be MIME-encoded (RFC2047) according to * https://bugzilla.mozilla.org/show_bug.cgi?id=41489 */ byte[] encoded = Base64.encodeBase64(userPassword.getBytes("latin1")); connection.setRequestProperty("Authorization", "Basic " + new String(encoded, "ascii")); connection.setRequestProperty("Accept", "text/xml"); int code = connection.getResponseCode(); /* * NB: myExperiment gives a 500 response for an invalid * username/password */ if (code == 401 || code == 500) { tryCount++; showMessageDialog(this, "The username and password failed", "Invalid username or password", ERROR_MESSAGE); if (tryCount >= MAX_TRIES) { // close after 3 attempts. this.password = null; this.username = null; this.setVisible(false); } } else { this.username = username; this.password = password; this.setVisible(false); } } catch (IOException ex) { logger.error("Could not get password", ex); } } private void cancelButtonActionPerformed(ActionEvent evt) { this.password = null; this.username = null; this.setVisible(false); } /** * @param args * the command line arguments */ public static void main(String args[]) { invokeLater(new Runnable() { @Override public void run() { new PasswordInput().setVisible(true); } }); } }