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/*******************************************************************************
* Copyright (c) 2008 compeople AG and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* compeople AG (Stefan Liebig) - initial API and implementation
*******************************************************************************/
package org.eclipse.core.internal.net.proxy.win32.winhttp;
import java.net.URI;
import java.util.regex.Pattern;
/**
* Encapsulates the windows specific proxy bypass list. It transforms the native API proxy bypass
* list into queryable java object.
*
* @see "http://msdn2.microsoft.com/en-us/library/aa383912(VS.85).aspx"
*/
public class ProxyBypass {
private final String proxyBypass;
private final Pattern proxyBypassPattern;
private final static String BYPASS_LOCAL_ADDESSES_TOKEN= "<local>"; //$NON-NLS-1$
/**
* Create a ProxyBypass instance from the proxy bypass list string.
*
* @param proxyBypass
*/
public ProxyBypass(String proxyBypass) {
this.proxyBypass= proxyBypass != null ? proxyBypass : ""; //$NON-NLS-1$
if (proxyBypass != null) {
String regExp= replace(proxyBypass, ";", "|"); //$NON-NLS-1$ //$NON-NLS-2$
regExp= replace(regExp, ".", "\\."); //$NON-NLS-1$ //$NON-NLS-2$
regExp= replace(regExp, "*", ".*"); //$NON-NLS-1$ //$NON-NLS-2$
this.proxyBypassPattern= Pattern.compile(regExp);
} else {
this.proxyBypassPattern= Pattern.compile(""); //$NON-NLS-1$
}
}
/**
* Check whether the given uri should bypass the proxy.
*
* @param uri
* @return true if the the uri should bypass the proxy; otherwise false
*/
public boolean bypassProxyFor(URI uri) {
final String host= uri.getHost();
if (host == null)
return false;
return (isLocal(host) && isBypassLocalAddresses(proxyBypass)) || isInBypassList(host);
}
/**
* @param proxyBypass
* @param uri
* @return
*/
private boolean isInBypassList(String host) {
return proxyBypassPattern.matcher(host).matches();
}
/**
* @param uri
* @return
*/
private static boolean isLocal(String host) {
return host.indexOf(".") == -1; //$NON-NLS-1$
}
/**
* @param addressListString
* @return
*/
private static boolean isBypassLocalAddresses(String proxyBypass) {
return proxyBypass.indexOf(BYPASS_LOCAL_ADDESSES_TOKEN) != -1;
}
/**
* Replace within <code>source</code> the occurrences of <code>from</code> with
* <code>to</code>.
*
* @param source
* @param from
* @param to
* @return the substituted string
*/
private static String replace(String source, String from, String to) {
if (from.length() == 0)
return source;
StringBuffer buffer= new StringBuffer();
int current= 0;
int pos= 0;
while (pos != -1) {
pos= source.indexOf(from, current);
if (pos == -1) {
buffer.append(source.substring(current));
} else {
buffer.append(source.substring(current, pos));
buffer.append(to);
current= pos + from.length();
}
}
return buffer.toString();
}
}
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