// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.io;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.openstreetmap.josm.Main;
/**
* Mirrors a file to a local file.
* <p>
* The file mirrored is only downloaded if it has been more than one day since last download
*/
public class MirroredInputStream extends InputStream {
InputStream fs = null;
File file = null;
public MirroredInputStream(String name) throws IOException {
this(name, null, -1L);
}
public MirroredInputStream(String name, long maxTime) throws IOException {
this(name, null, maxTime);
}
public MirroredInputStream(String name, String destDir) throws IOException {
this(name, destDir, -1L);
}
public MirroredInputStream(String name, String destDir, long maxTime) throws IOException {
URL url;
try {
url = new URL(name);
if (url.getProtocol().equals("file")) {
file = new File(name.substring("file:/".length()));
if (!file.exists()) {
file = new File(name.substring("file://".length()));
}
} else {
file = checkLocal(url, destDir, maxTime);
}
} catch (java.net.MalformedURLException e) {
if(name.startsWith("resource://")) {
fs = getClass().getResourceAsStream(
name.substring("resource:/".length()));
if (fs == null)
throw new IOException(tr("Failed to open input stream for resource ''{0}''", name));
return;
}
file = new File(name);
}
if (file == null)
throw new IOException();
fs = new FileInputStream(file);
}
/**
* Replies an input stream for a file in a ZIP-file. Replies a file in the top
* level directory of the ZIP file which has an extension <code>extension</code>. If more
* than one files have this extension, the last file whose name includes <code>namepart</code>
* is opened.
*
* @param extension the extension of the file we're looking for
* @param namepart the name part
* @return an input stream. Null if this mirrored input stream doesn't represent a zip file or if
* there was no matching file in the ZIP file
*/
public InputStream getZipEntry(String extension, String namepart) {
if (file == null)
return null;
InputStream res = null;
try {
ZipFile zipFile = new ZipFile(file);
ZipEntry resentry = null;
Enumeration<? extends ZipEntry> entries = zipFile.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
if (entry.getName().endsWith("." + extension)) {
/* choose any file with correct extension. When more than
one file, prefer the one which matches namepart */
if (resentry == null || entry.getName().indexOf(namepart) >= 0) {
resentry = entry;
}
}
}
if (resentry != null) {
res = zipFile.getInputStream(resentry);
} else {
zipFile.close();
}
} catch (Exception e) {
if(file.getName().endsWith(".zip")) {
System.err.println(tr("Warning: failed to open file with extension ''{2}'' and namepart ''{3}'' in zip file ''{0}''. Exception was: {1}",
file.getName(), e.toString(), extension, namepart));
}
}
return res;
}
public File getFile()
{
return file;
}
static public void cleanup(String name)
{
cleanup(name, null);
}
static public void cleanup(String name, String destDir)
{
URL url;
try {
url = new URL(name);
if (!url.getProtocol().equals("file"))
{
String localPath = Main.pref.get("mirror." + url);
if (localPath != null && localPath.length() > 0)
{
String[] lp = localPath.split(";");
File lfile = new File(lp[1]);
if(lfile.exists()) {
lfile.delete();
}
}
Main.pref.put("mirror." + url, null);
}
} catch (java.net.MalformedURLException e) {}
}
private File checkLocal(URL url, String destDir, long maxTime) {
String localPath = Main.pref.get("mirror." + url);
File file = null;
if (localPath != null && localPath.length() > 0) {
String[] lp = localPath.split(";");
file = new File(lp[1]);
if (maxTime <= 0) {
maxTime = Main.pref.getInteger("mirror.maxtime", 7*24*60*60);
}
if (System.currentTimeMillis() - Long.parseLong(lp[0]) < maxTime*1000) {
if(file.exists())
return file;
}
}
if(destDir == null) {
destDir = Main.pref.getPreferencesDir();
}
File destDirFile = new File(destDir);
if (!destDirFile.exists()) {
destDirFile.mkdirs();
}
String a = url.toString().replaceAll("[^A-Za-z0-9_.-]", "_");
localPath = "mirror_" + a;
destDirFile = new File(destDir, localPath + ".tmp");
BufferedOutputStream bos = null;
BufferedInputStream bis = null;
try {
URLConnection conn = url.openConnection();
conn.setConnectTimeout(5000);
bis = new BufferedInputStream(conn.getInputStream());
bos = new BufferedOutputStream( new FileOutputStream(destDirFile));
byte[] buffer = new byte[4096];
int length;
while ((length = bis.read(buffer)) > -1) {
bos.write(buffer, 0, length);
}
} catch(IOException ioe) {
if (file != null)
return file;
return null;
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (bos != null) {
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
file = new File(destDir, localPath);
destDirFile.renameTo(file);
Main.pref.put("mirror." + url, System.currentTimeMillis() + ";" + file);
}
return file;
}
@Override
public int available() throws IOException
{ return fs.available(); }
@Override
public void close() throws IOException
{ fs.close(); }
@Override
public int read() throws IOException
{ return fs.read(); }
@Override
public int read(byte[] b) throws IOException
{ return fs.read(b); }
@Override
public int read(byte[] b, int off, int len) throws IOException
{ return fs.read(b,off, len); }
@Override
public long skip(long n) throws IOException
{ return fs.skip(n); }
}