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2011-10-26 09:44:02 +02:00
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+/* Copyright (c) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package sample.spreadsheet.gui;
+
+import com.google.gdata.client.GoogleService.CaptchaRequiredException;
+import com.google.gdata.client.spreadsheet.SpreadsheetService;
+import com.google.gdata.util.AuthenticationException;
+
+import java.awt.BorderLayout;
+import java.awt.Container;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.IOException;
+import java.net.URL;
+
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JPasswordField;
+import javax.swing.JTextField;
+import javax.swing.SwingConstants;
+
+/**
+ * A Swing window for logging in to Google Spreadsheets.
+ *
+ * 
+ */
+public class LoginFrame extends JFrame {
+
+  /** The spreadsheet service. */
+  private SpreadsheetService service;
+
+  /** Field for entering username. */
+  private JTextField usernameField;
+
+  /** Field for entering password. */
+  private JPasswordField passwordField;
+
+  /** Image to display as a CAPTCHA (distorted letters to verify human). */
+  private JLabel captchaImage;
+
+  /** Place where user types the captcha answer. */
+  private JTextField captchaAnswerField;
+
+  /** Button to log in. */
+  private JButton submitButton;
+
+  /**
+   * The captcha token that is issued,
+   * null if there was no CAPTCHA challenge.
+   */
+  private String captchaToken = null;
+
+
+  /**
+   * Starts out the login window, for a particular service and
+   * feed root, with initial username and password (these can
+   * be blank strings).
+   */
+  public LoginFrame(SpreadsheetService service,
+      String username, String password) {
+    this.service = service;
+
+    initializeGui();
+
+    usernameField.setText(username);
+    passwordField.setText(password);
+  }
+
+  /**
+   * Try authenticating the user with the provided username and
+   * password.
+   */
+  private boolean authenticate(
+      String username, String password) {
+    try {
+      if (captchaToken == null) {
+
+        // No CAPTCHA challenge was presented.
+        // Proceed to the next step.
+        service.setUserCredentials(username, password);
+      } else {
+
+        // Use the CAPTCHA token and answer to help the
+        // authentication.
+        service.setUserCredentials(username, password, captchaToken,
+            captchaAnswerField.getText());
+      }
+      return true;
+    } catch (CaptchaRequiredException e) {
+
+      // Get the CAPTCHA token and display the image.
+      captchaToken = e.getCaptchaToken();
+      try {
+        captchaImage.setIcon(new ImageIcon(new URL(e.getCaptchaUrl())));
+        captchaAnswerField.setText("(Please write the above letters here)");
+      } catch (IOException ioe) {
+        captchaImage.setText("(Error parsing captcha image URL)");
+      }
+      return false;
+    } catch (AuthenticationException e) {
+      SpreadsheetApiDemo.showErrorBox(e);
+      return false;
+    }
+  }
+
+  /**
+   * Handles the submit button being pressed.
+   */
+  private void handleSubmitButton() {
+    String username = usernameField.getText();
+    String password = new String(passwordField.getPassword());
+
+    if (authenticate(username, password)) {
+      new ChooseSpreadsheetFrame(service);
+      dispose();
+    }
+  }
+
+
+  // ---- GUI code from here on down ----------------------------------------
+
+  /**
+   * Handles all clicks.
+   */
+  private class ActionHandler implements ActionListener {
+    public void actionPerformed(ActionEvent ae) {
+      if (ae.getSource() == submitButton) {
+        handleSubmitButton();
+      }
+    }
+  }
+
+  /**
+   * Initializes all the GUI widgets.
+   */
+  private void initializeGui() {
+    setTitle("Log in to Google Spreadsheets");
+
+    Container panel = getContentPane();
+
+    panel.setLayout(new BorderLayout());
+
+    JPanel topPanel = new JPanel();
+    topPanel.setLayout(new GridLayout(4, 1));
+
+    topPanel.add(new JLabel("Log in to Google Spreadsheets!"));
+
+    usernameField = new JTextField();
+    topPanel.add(usernameField);
+
+    passwordField = new JPasswordField();
+    topPanel.add(passwordField);
+
+    submitButton = new JButton("Log in!");
+    submitButton.addActionListener(new ActionHandler());
+    topPanel.add(submitButton);
+
+    panel.add(topPanel, BorderLayout.NORTH);
+
+    captchaImage = new JLabel("(A CAPTCHA may appear here)",
+        SwingConstants.CENTER);
+    panel.add(captchaImage, BorderLayout.CENTER);
+
+    captchaAnswerField = new JTextField();
+    captchaAnswerField.setText("(type captcha answer here)");
+    panel.add(captchaAnswerField, BorderLayout.SOUTH);
+
+    setSize(300, 240);
+    setVisible(true);
+  }
+}