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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
/* jcifs smb client library in Java
* Copyright (C) 2002 "Michael B. Allen"
* "Eric Glass"
*
* 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 jcifs.http;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
/**
* A URLStreamHandler used to provide NTLM authentication
* capabilities to the default HTTP handler. This acts as a wrapper,
* handling authentication and passing control to the underlying
* stream handler.
*/
public class Handler extends URLStreamHandler {
/**
* The default HTTP port (80).
*/
public static final int DEFAULT_HTTP_PORT = 80;
private static final Map PROTOCOL_HANDLERS = new HashMap();
private static final String HANDLER_PKGS_PROPERTY =
"java.protocol.handler.pkgs";
/**
* Vendor-specific default packages. If no packages are specified in
* "java.protocol.handler.pkgs", the VM uses one or more default
* packages, which are vendor specific. Sun's is included below
* for convenience; others could be as well. If a particular vendor's
* package isn't listed, it can be specified in
* "java.protocol.handler.pkgs".
*/
private static final String[] JVM_VENDOR_DEFAULT_PKGS = new String[] {
"sun.net.www.protocol"
};
private static URLStreamHandlerFactory factory;
/**
* Sets the URL stream handler factory for the environment. This
* allows specification of the factory used in creating underlying
* stream handlers. This can be called once per JVM instance.
*
* @param factory The URL stream handler factory.
*/
public static void setURLStreamHandlerFactory(
URLStreamHandlerFactory factory) {
synchronized (PROTOCOL_HANDLERS) {
if (Handler.factory != null) {
throw new IllegalStateException(
"URLStreamHandlerFactory already set.");
}
PROTOCOL_HANDLERS.clear();
Handler.factory = factory;
}
}
/**
* Returns the default HTTP port.
*
* @return An int containing the default HTTP port.
*/
protected int getDefaultPort() {
return DEFAULT_HTTP_PORT;
}
protected URLConnection openConnection(URL url) throws IOException {
url = new URL(url, url.toExternalForm(),
getDefaultStreamHandler(url.getProtocol()));
return new NtlmHttpURLConnection((HttpURLConnection)
url.openConnection());
}
private static URLStreamHandler getDefaultStreamHandler(String protocol)
throws IOException {
synchronized (PROTOCOL_HANDLERS) {
URLStreamHandler handler = (URLStreamHandler)
PROTOCOL_HANDLERS.get(protocol);
if (handler != null) return handler;
if (factory != null) {
handler = factory.createURLStreamHandler(protocol);
}
if (handler == null) {
String path = System.getProperty(HANDLER_PKGS_PROPERTY);
StringTokenizer tokenizer = new StringTokenizer(path, "|");
while (tokenizer.hasMoreTokens()) {
String provider = tokenizer.nextToken().trim();
if (provider.equals("jcifs")) continue;
String className = provider + "." + protocol + ".Handler";
try {
Class handlerClass = null;
try {
handlerClass = Class.forName(className);
} catch (Exception ex) { }
if (handlerClass == null) {
handlerClass = ClassLoader.getSystemClassLoader(
).loadClass(className);
}
handler = (URLStreamHandler) handlerClass.newInstance();
break;
} catch (Exception ex) { }
}
}
if (handler == null) {
for (int i = 0; i < JVM_VENDOR_DEFAULT_PKGS.length; i++) {
String className = JVM_VENDOR_DEFAULT_PKGS[i] + "." +
protocol + ".Handler";
try {
Class handlerClass = null;
try {
handlerClass = Class.forName(className);
} catch (Exception ex) { }
if (handlerClass == null) {
handlerClass = ClassLoader.getSystemClassLoader(
).loadClass(className);
}
handler = (URLStreamHandler) handlerClass.newInstance();
} catch (Exception ex) { }
if (handler != null) break;
}
}
if (handler == null) {
throw new IOException(
"Unable to find default handler for protocol: " +
protocol);
}
PROTOCOL_HANDLERS.put(protocol, handler);
return handler;
}
}
}