AbstractLoginDialog.java

   1 package org.argeo.security.ui.dialogs;
   2
   3 import java.io.IOException;
   4
   5 import javax.security.auth.callback.Callback;
   6 import javax.security.auth.callback.CallbackHandler;
   7 import javax.security.auth.callback.NameCallback;
   8 import javax.security.auth.callback.PasswordCallback;
   9
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.argeo.security.ui.SecurityUiPlugin;
  13 import org.eclipse.core.runtime.IProgressMonitor;
  14 import org.eclipse.core.runtime.NullProgressMonitor;
  15 import org.eclipse.jface.dialogs.IDialogConstants;
  16 import org.eclipse.jface.dialogs.TrayDialog;
  17 import org.eclipse.jface.operation.IRunnableWithProgress;
  18 import org.eclipse.jface.operation.ModalContext;
  19 import org.eclipse.swt.events.SelectionEvent;
  20 import org.eclipse.swt.events.SelectionListener;
  21 import org.eclipse.swt.widgets.Button;
  22 import org.eclipse.swt.widgets.Display;
  23 import org.eclipse.swt.widgets.Shell;
  24
  25 /** Base for login dialogs */
  26 public abstract class AbstractLoginDialog extends TrayDialog implements
  27                 CallbackHandler {
  28
  29         private final static Log log = LogFactory.getLog(AbstractLoginDialog.class);
  30
  31         private Thread modalContextThread = null;
  32         boolean processCallbacks = false;
  33         boolean isCancelled = false;
  34         Callback[] callbackArray;
  35
  36         protected final Callback[] getCallbacks() {
  37                 return this.callbackArray;
  38         }
  39
  40         public abstract void internalHandle();
  41
  42         public boolean isCancelled() {
  43                 return isCancelled;
  44         }
  45
  46         protected AbstractLoginDialog(Shell parentShell) {
  47                 super(parentShell);
  48         }
  49
  50         /*
  51          * (non-Javadoc)
  52          *
  53          * @see
  54          * javax.security.auth.callback.CallbackHandler#handle(javax.security.auth
  55          * .callback.Callback[])
  56          */
  57         public void handle(final Callback[] callbacks) throws IOException {
  58                 // clean previous usage
  59                 if (processCallbacks) {
  60                         // this handler was already used
  61                         processCallbacks = false;
  62                 }
  63
  64                 if (modalContextThread != null) {
  65                         try {
  66                                 modalContextThread.join(1000);
  67                         } catch (InterruptedException e) {
  68                                 // silent
  69                         }
  70                         modalContextThread = null;
  71                 }
  72
  73                 // initialize
  74                 this.callbackArray = callbacks;
  75                 final Display display = Display.getDefault();
  76                 display.syncExec(new Runnable() {
  77
  78                         public void run() {
  79                                 isCancelled = false;
  80                                 setBlockOnOpen(false);
  81                                 open();
  82                                 final Button okButton = getButton(IDialogConstants.OK_ID);
  83                                 okButton.setText("Login");
  84                                 okButton.addSelectionListener(new SelectionListener() {
  85
  86                                         public void widgetSelected(final SelectionEvent event) {
  87                                                 processCallbacks = true;
  88                                         }
  89
  90                                         public void widgetDefaultSelected(final SelectionEvent event) {
  91                                                 // nothing to do
  92                                         }
  93                                 });
  94                                 final Button cancel = getButton(IDialogConstants.CANCEL_ID);
  95                                 cancel.addSelectionListener(new SelectionListener() {
  96
  97                                         public void widgetSelected(final SelectionEvent event) {
  98                                                 isCancelled = true;
  99                                                 processCallbacks = true;
 100                                         }
 101
 102                                         public void widgetDefaultSelected(final SelectionEvent event) {
 103                                                 // nothing to do
 104                                         }
 105                                 });
 106                         }
 107                 });
 108                 try {
 109                         ModalContext.setAllowReadAndDispatch(true); // Works for now.
 110                         ModalContext.run(new IRunnableWithProgress() {
 111
 112                                 public void run(final IProgressMonitor monitor) {
 113                                         modalContextThread = Thread.currentThread();
 114                                         // Wait here until OK or cancel is pressed, then let it rip.
 115                                         // The event
 116                                         // listener
 117                                         // is responsible for closing the dialog (in the
 118                                         // loginSucceeded
 119                                         // event).
 120                                         while (!processCallbacks && (modalContextThread != null)
 121                                                         && (modalContextThread == Thread.currentThread())
 122                                                         && SecurityUiPlugin.getDefault() != null) {
 123                                                 // Note: SecurityUiPlugin.getDefault() != null is false
 124                                                 // when the OSGi runtime is shut down
 125                                                 try {
 126                                                         Thread.sleep(100);
 127                                                         // if (display.isDisposed()) {
 128                                                         // log.warn("Display is disposed, killing login dialog thread");
 129                                                         // throw new ThreadDeath();
 130                                                         // }
 131                                                 } catch (final Exception e) {
 132                                                         // do nothing
 133                                                 }
 134                                         }
 135                                         processCallbacks = false;
 136                                         // Call the adapter to handle the callbacks
 137                                         if (!isCancelled())
 138                                                 internalHandle();
 139                                         else
 140                                                 // clear callbacks are when cancelling
 141                                                 for (Callback callback : callbacks)
 142                                                         if (callback instanceof PasswordCallback)
 143                                                                 ((PasswordCallback) callback).setPassword(null);
 144                                                         else if (callback instanceof NameCallback)
 145                                                                 ((NameCallback) callback).setName(null);
 146                                 }
 147                         }, true, new NullProgressMonitor(), Display.getDefault());
 148                 } catch (ThreadDeath e) {
 149                         isCancelled = true;
 150                         log.debug("Thread " + Thread.currentThread().getId() + " died");
 151                         throw e;
 152                 } catch (Exception e) {
 153                         isCancelled = true;
 154                         IOException ioe = new IOException(
 155                                         "Unexpected issue in login dialog, see root cause for more details");
 156                         ioe.initCause(e);
 157                         throw ioe;
 158                 } finally {
 159                         // so that the modal thread dies
 160                         processCallbacks = true;
 161                         // try {
 162                         // // wait for the modal context thread to gracefully exit
 163                         // modalContextThread.join();
 164                         // } catch (InterruptedException ie) {
 165                         // // silent
 166                         // }
 167                         modalContextThread = null;
 168                 }
 169         }
 170
 171         protected void configureShell(Shell shell) {
 172                 super.configureShell(shell);
 173                 shell.setText("Login");
 174         }
 175 }