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Utility classes for Jetty
// ========================================================================
// Copyright (c) 1996-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.util.resource;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.text.DateFormat;
import java.util.Arrays;
import java.util.Date;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.Loader;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* Abstract resource class.
*/
public abstract class Resource implements ResourceFactory
{
private static final Logger LOG = Log.getLogger(Resource.class);
public static boolean __defaultUseCaches = true;
volatile Object _associate;
/**
* Change the default setting for url connection caches.
* Subsequent URLConnections will use this default.
* @param useCaches
*/
public static void setDefaultUseCaches (boolean useCaches)
{
__defaultUseCaches=useCaches;
}
/* ------------------------------------------------------------ */
public static boolean getDefaultUseCaches ()
{
return __defaultUseCaches;
}
/* ------------------------------------------------------------ */
/** Construct a resource from a uri.
* @param uri A URI.
* @return A Resource object.
* @throws IOException Problem accessing URI
*/
public static Resource newResource(URI uri)
throws IOException
{
return newResource(uri.toURL());
}
/* ------------------------------------------------------------ */
/** Construct a resource from a url.
* @param url A URL.
* @return A Resource object.
* @throws IOException Problem accessing URL
*/
public static Resource newResource(URL url)
throws IOException
{
return newResource(url, __defaultUseCaches);
}
/* ------------------------------------------------------------ */
/**
* Construct a resource from a url.
* @param url the url for which to make the resource
* @param useCaches true enables URLConnection caching if applicable to the type of resource
* @return
*/
static Resource newResource(URL url, boolean useCaches)
{
if (url==null)
return null;
String url_string=url.toExternalForm();
if( url_string.startsWith( "file:"))
{
try
{
FileResource fileResource= new FileResource(url);
return fileResource;
}
catch(Exception e)
{
LOG.debug(Log.EXCEPTION,e);
return new BadResource(url,e.toString());
}
}
else if( url_string.startsWith( "jar:file:"))
{
return new JarFileResource(url, useCaches);
}
else if( url_string.startsWith( "jar:"))
{
return new JarResource(url, useCaches);
}
return new URLResource(url,null,useCaches);
}
/* ------------------------------------------------------------ */
/** Construct a resource from a string.
* @param resource A URL or filename.
* @return A Resource object.
*/
public static Resource newResource(String resource)
throws MalformedURLException, IOException
{
return newResource(resource, __defaultUseCaches);
}
/* ------------------------------------------------------------ */
/** Construct a resource from a string.
* @param resource A URL or filename.
* @param useCaches controls URLConnection caching
* @return A Resource object.
*/
public static Resource newResource (String resource, boolean useCaches)
throws MalformedURLException, IOException
{
URL url=null;
try
{
// Try to format as a URL?
url = new URL(resource);
}
catch(MalformedURLException e)
{
if(!resource.startsWith("ftp:") &&
!resource.startsWith("file:") &&
!resource.startsWith("jar:"))
{
try
{
// It's a file.
if (resource.startsWith("./"))
resource=resource.substring(2);
File file=new File(resource).getCanonicalFile();
url=Resource.toURL(file);
URLConnection connection=url.openConnection();
connection.setUseCaches(useCaches);
FileResource fileResource= new FileResource(url,connection,file);
return fileResource;
}
catch(Exception e2)
{
LOG.debug(Log.EXCEPTION,e2);
throw e;
}
}
else
{
LOG.warn("Bad Resource: "+resource);
throw e;
}
}
// Make sure that any special characters stripped really are ignorable.
String nurl=url.toString();
if (nurl.length()>0 && nurl.charAt(nurl.length()-1)!=resource.charAt(resource.length()-1))
{
if ((nurl.charAt(nurl.length()-1)!='/' ||
nurl.charAt(nurl.length()-2)!=resource.charAt(resource.length()-1))
&&
(resource.charAt(resource.length()-1)!='/' ||
resource.charAt(resource.length()-2)!=nurl.charAt(nurl.length()-1)
))
{
return new BadResource(url,"Trailing special characters stripped by URL in "+resource);
}
}
return newResource(url);
}
/* ------------------------------------------------------------ */
/** Construct a system resource from a string.
* The resource is tried as classloader resource before being
* treated as a normal resource.
* @param resource Resource as string representation
* @return The new Resource
* @throws IOException Problem accessing resource.
*/
public static Resource newSystemResource(String resource)
throws IOException
{
URL url=null;
// Try to format as a URL?
ClassLoader
loader=Thread.currentThread().getContextClassLoader();
if (loader!=null)
{
try
{
url = loader.getResource(resource);
if (url == null && resource.startsWith("/"))
url = loader.getResource(resource.substring(1));
}
catch (IllegalArgumentException e)
{
// Catches scenario where a bad Windows path like "C:\dev" is
// improperly escaped, which various downstream classloaders
// tend to have a problem with
url = null;
}
}
if (url==null)
{
loader=Resource.class.getClassLoader();
if (loader!=null)
{
url=loader.getResource(resource);
if (url==null && resource.startsWith("/"))
url=loader.getResource(resource.substring(1));
}
}
if (url==null)
{
url=ClassLoader.getSystemResource(resource);
if (url==null && resource.startsWith("/"))
url=loader.getResource(resource.substring(1));
}
if (url==null)
return null;
return newResource(url);
}
/* ------------------------------------------------------------ */
/** Find a classpath resource.
*/
public static Resource newClassPathResource(String resource)
{
return newClassPathResource(resource,true,false);
}
/* ------------------------------------------------------------ */
/** Find a classpath resource.
* The {@link java.lang.Class#getResource(String)} method is used to lookup the resource. If it is not
* found, then the {@link Loader#getResource(Class, String, boolean)} method is used.
* If it is still not found, then {@link ClassLoader#getSystemResource(String)} is used.
* Unlike {@link ClassLoader#getSystemResource(String)} this method does not check for normal resources.
* @param name The relative name of the resource
* @param useCaches True if URL caches are to be used.
* @param checkParents True if forced searching of parent Classloaders is performed to work around
* loaders with inverted priorities
* @return Resource or null
*/
public static Resource newClassPathResource(String name,boolean useCaches,boolean checkParents)
{
URL url=Resource.class.getResource(name);
if (url==null)
{
try
{
url=Loader.getResource(Resource.class,name,checkParents);
}
catch(ClassNotFoundException e)
{
url=ClassLoader.getSystemResource(name);
}
}
if (url==null)
return null;
return newResource(url,useCaches);
}
/* ------------------------------------------------------------ */
public static boolean isContainedIn (Resource r, Resource containingResource) throws MalformedURLException
{
return r.isContainedIn(containingResource);
}
/* ------------------------------------------------------------ */
@Override
protected void finalize()
{
release();
}
/* ------------------------------------------------------------ */
public abstract boolean isContainedIn (Resource r) throws MalformedURLException;
/* ------------------------------------------------------------ */
/** Release any temporary resources held by the resource.
*/
public abstract void release();
/* ------------------------------------------------------------ */
/**
* Returns true if the respresened resource exists.
*/
public abstract boolean exists();
/* ------------------------------------------------------------ */
/**
* Returns true if the respresenetd resource is a container/directory.
* If the resource is not a file, resources ending with "/" are
* considered directories.
*/
public abstract boolean isDirectory();
/* ------------------------------------------------------------ */
/**
* Returns the last modified time
*/
public abstract long lastModified();
/* ------------------------------------------------------------ */
/**
* Return the length of the resource
*/
public abstract long length();
/* ------------------------------------------------------------ */
/**
* Returns an URL representing the given resource
*/
public abstract URL getURL();
/* ------------------------------------------------------------ */
/**
* Returns an URI representing the given resource
*/
public URI getURI()
{
try
{
return getURL().toURI();
}
catch(Exception e)
{
throw new RuntimeException(e);
}
}
/* ------------------------------------------------------------ */
/**
* Returns an File representing the given resource or NULL if this
* is not possible.
*/
public abstract File getFile()
throws IOException;
/* ------------------------------------------------------------ */
/**
* Returns the name of the resource
*/
public abstract String getName();
/* ------------------------------------------------------------ */
/**
* Returns an input stream to the resource
*/
public abstract InputStream getInputStream()
throws java.io.IOException;
/* ------------------------------------------------------------ */
/**
* Returns an output stream to the resource
*/
public abstract OutputStream getOutputStream()
throws java.io.IOException, SecurityException;
/* ------------------------------------------------------------ */
/**
* Deletes the given resource
*/
public abstract boolean delete()
throws SecurityException;
/* ------------------------------------------------------------ */
/**
* Rename the given resource
*/
public abstract boolean renameTo( Resource dest)
throws SecurityException;
/* ------------------------------------------------------------ */
/**
* Returns a list of resource names contained in the given resource
* The resource names are not URL encoded.
*/
public abstract String[] list();
/* ------------------------------------------------------------ */
/**
* Returns the resource contained inside the current resource with the
* given name.
* @param path The path segment to add, which should be encoded by the
* encode method.
*/
public abstract Resource addPath(String path)
throws IOException,MalformedURLException;
/* ------------------------------------------------------------ */
/** Get a resource from withing this resource.
*
* This method is essentially an alias for {@link #addPath(String)}, but without checked exceptions.
* This method satisfied the {@link ResourceFactory} interface.
* @see org.eclipse.jetty.util.resource.ResourceFactory#getResource(java.lang.String)
*/
public Resource getResource(String path)
{
try
{
return addPath(path);
}
catch(Exception e)
{
LOG.debug(e);
return null;
}
}
/* ------------------------------------------------------------ */
/** Encode according to this resource type.
* The default implementation calls URI.encodePath(uri)
* @param uri
* @return String encoded for this resource type.
*/
public String encode(String uri)
{
return URIUtil.encodePath(uri);
}
/* ------------------------------------------------------------ */
public Object getAssociate()
{
return _associate;
}
/* ------------------------------------------------------------ */
public void setAssociate(Object o)
{
_associate=o;
}
/* ------------------------------------------------------------ */
/**
* @return The canonical Alias of this resource or null if none.
*/
public URL getAlias()
{
return null;
}
/* ------------------------------------------------------------ */
/** Get the resource list as a HTML directory listing.
* @param base The base URL
* @param parent True if the parent directory should be included
* @return String of HTML
*/
public String getListHTML(String base,boolean parent)
throws IOException
{
base=URIUtil.canonicalPath(base);
if (base==null || !isDirectory())
return null;
String[] ls = list();
if (ls==null)
return null;
Arrays.sort(ls);
String decodedBase = URIUtil.decodePath(base);
String title = "Directory: "+deTag(decodedBase);
StringBuilder buf=new StringBuilder(4096);
buf.append("
");
buf.append("");
buf.append(title);
buf.append(" \n");
buf.append(title);
buf.append("
\n\n");
if (parent)
{
buf.append("Parent Directory ");
buf.append(deTag(ls[i]));
buf.append(" ");
buf.append(" ");
buf.append(item.length());
buf.append(" bytes ");
buf.append(dfmt.format(new Date(item.lastModified())));
buf.append("
\n");
buf.append("\n");
return buf.toString();
}
/**
* Encode any characters that could break the URI string in an HREF.
* Such as ">Link
*
* The above example would parse incorrectly on various browsers as the "<" or '"' characters
* would end the href attribute value string prematurely.
*
* @param raw the raw text to encode.
* @return the defanged text.
*/
private static String hrefEncodeURI(String raw)
{
StringBuffer buf = null;
loop:
for (int i=0;i':
buf=new StringBuffer(raw.length()<<1);
break loop;
}
}
if (buf==null)
return raw;
for (int i=0;i':
buf.append("%3E");
continue;
default:
buf.append(c);
continue;
}
}
return buf.toString();
}
private static String deTag(String raw)
{
return StringUtil.replace( StringUtil.replace(raw,"<","<"), ">", ">");
}
/* ------------------------------------------------------------ */
/**
* @param out
* @param start First byte to write
* @param count Bytes to write or -1 for all of them.
*/
public void writeTo(OutputStream out,long start,long count)
throws IOException
{
InputStream in = getInputStream();
try
{
in.skip(start);
if (count<0)
IO.copy(in,out);
else
IO.copy(in,out,count);
}
finally
{
in.close();
}
}
/* ------------------------------------------------------------ */
public void copyTo(File destination)
throws IOException
{
if (destination.exists())
throw new IllegalArgumentException(destination+" exists");
writeTo(new FileOutputStream(destination),0,-1);
}
/* ------------------------------------------------------------ */
/** Generate a properly encoded URL from a {@link File} instance.
* @param file Target file.
* @return URL of the target file.
* @throws MalformedURLException
*/
public static URL toURL(File file) throws MalformedURLException
{
return file.toURI().toURL();
}
}