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// Copyright (C) 2009 Red Hat, Inc.
//
// This library 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 library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package net.sourceforge.jnlp.util;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Arrays;
import net.sourceforge.jnlp.IconDesc;
import net.sourceforge.jnlp.JNLPFile;
import net.sourceforge.jnlp.StreamEater;
import net.sourceforge.jnlp.cache.CacheUtil;
import net.sourceforge.jnlp.cache.UpdatePolicy;
import net.sourceforge.jnlp.config.DeploymentConfiguration;
import net.sourceforge.jnlp.runtime.JNLPRuntime;
/**
* This class builds a (freedesktop.org) desktop entry out of a {@link JNLPFile}
* . This entry can be used to install desktop shortcuts. See xdg-desktop-icon
* (1) and http://standards.freedesktop.org/desktop-entry-spec/latest/ for more
* information
*
* @author Omair Majid
*
*/
public class XDesktopEntry {
public static final String JAVA_ICON_NAME = "java";
private JNLPFile file = null;
private int iconSize = -1;
private String iconLocation = null;
private int[] VALID_ICON_SIZES = new int[] { 16, 22, 32, 48, 64, 128 };
/**
* Create a XDesktopEntry for the given JNLP file
*
* @param file a {@link JNLPFile} that indicates the application to launch
*/
public XDesktopEntry(JNLPFile file) {
this.file = file;
/* looks like a good initial value */
iconSize = VALID_ICON_SIZES[2];
}
/**
* Returns the contents of the {@link XDesktopEntry} through the
* {@link Reader} interface.
*/
public Reader getContentsAsReader() {
String cacheDir = JNLPRuntime.getConfiguration()
.getProperty(DeploymentConfiguration.KEY_USER_CACHE_DIR);
File cacheFile = CacheUtil.urlToPath(file.getSourceLocation(), cacheDir);
String fileContents = "[Desktop Entry]\n";
fileContents += "Version=1.0\n";
fileContents += "Name=" + sanitize(file.getTitle()) + "\n";
fileContents += "GenericName=Java Web Start Application\n";
fileContents += "Comment=" + sanitize(file.getInformation().getDescription()) + "\n";
fileContents += "Type=Application\n";
if (iconLocation != null) {
fileContents += "Icon=" + iconLocation + "\n";
} else {
fileContents += "Icon=" + JAVA_ICON_NAME + "\n";
}
if (file.getInformation().getVendor() != null) {
fileContents += "Vendor=" + sanitize(file.getInformation().getVendor()) + "\n";
}
//Shortcut executes the jnlp from cache and system preferred java..
fileContents += "Exec=" + "javaws" + " \"" + cacheFile.getAbsolutePath() + "\"\n";
return new StringReader(fileContents);
}
/**
* Sanitizes a string so that it can be used safely in a key=value pair in a
* desktop entry file.
*
* @param input a String to sanitize
* @return a string safe to use as either the key or the value in the
* key=value pair in a desktop entry file
*/
private static String sanitize(String input) {
if (input == null) {
return "";
}
/* key=value pairs must be a single line */
return input.split("\n")[0];
}
/**
* Get the size of the icon (in pixels) for the desktop shortcut
*/
public int getIconSize() {
return iconSize;
}
/**
* Set the icon size to use for the desktop shortcut
*
* @param size the size (in pixels) of the icon to use. Commonly used sizes
* are of 16, 22, 32, 48, 64 and 128
*/
public void setIconSize(int size) {
iconSize = size;
}
/**
* Create a desktop shortcut for this desktop entry
*/
public void createDesktopShortcut() {
try {
cacheIcon();
installDesktopLauncher();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Install this XDesktopEntry into the user's desktop as a launcher
*/
private void installDesktopLauncher() {
File shortcutFile = new File(JNLPRuntime.getConfiguration()
.getProperty(DeploymentConfiguration.KEY_USER_TMP_DIR)
+ File.separator + FileUtils.sanitizeFileName(file.getTitle()) + ".desktop");
try {
if (!shortcutFile.getParentFile().isDirectory() && !shortcutFile.getParentFile().mkdirs()) {
throw new IOException(shortcutFile.getParentFile().toString());
}
FileUtils.createRestrictedFile(shortcutFile, true);
/*
* Write out a Java String (UTF-16) as a UTF-8 file
*/
OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(shortcutFile),
Charset.forName("UTF-8"));
Reader reader = getContentsAsReader();
char[] buffer = new char[1024];
int ret = 0;
while (-1 != (ret = reader.read(buffer))) {
writer.write(buffer, 0, ret);
}
reader.close();
writer.close();
/*
* Install the desktop entry
*/
String[] execString = new String[] { "xdg-desktop-icon", "install", "--novendor",
shortcutFile.getCanonicalPath() };
if (JNLPRuntime.isDebug()) {
System.err.println("Execing: " + Arrays.toString(execString));
}
Process installer = Runtime.getRuntime().exec(execString);
new StreamEater(installer.getInputStream()).start();
new StreamEater(installer.getErrorStream()).start();
try {
installer.waitFor();
} catch (InterruptedException e) {
e.printStackTrace();
}
if (!shortcutFile.delete()) {
throw new IOException("Unable to delete temporary file:" + shortcutFile);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Cache the icon for the desktop entry
*/
private void cacheIcon() {
URL iconLocation = file.getInformation().getIconLocation(IconDesc.SHORTCUT, iconSize,
iconSize);
if (iconLocation == null) {
iconLocation = file.getInformation().getIconLocation(IconDesc.DEFAULT, iconSize,
iconSize);
}
if (iconLocation != null) {
String location = CacheUtil.getCachedResource(iconLocation, null, UpdatePolicy.SESSION)
.toString();
if (!location.startsWith("file:")) {
throw new RuntimeException("Unable to cache icon");
}
this.iconLocation = location.substring("file:".length());
if (JNLPRuntime.isDebug()) {
System.err.println("Cached desktop shortcut icon: " + this.iconLocation);
}
}
}
}
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