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package com.btr.proxy.selector.whitelist;
import java.net.URI;
import com.btr.proxy.util.UriFilter;
/*****************************************************************************
* Tests if a host name of a given URI matches some criteria.
*
* @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
****************************************************************************/
public class HostnameFilter implements UriFilter {
private static final String PROTOCOL_ENDING = "://";
public enum Mode {BEGINS_WITH, ENDS_WITH, REGEX}
private String matchTo;
private String protocolFilter;
private Mode mode;
/*************************************************************************
* Constructor
* @param mode the filter mode.
* @param matchTo the match criteria.
************************************************************************/
public HostnameFilter(Mode mode, String matchTo) {
super();
this.mode = mode;
this.matchTo = matchTo.toLowerCase();
extractProtocolFilter();
}
/*************************************************************************
* Extracts the protocol if one is given to initialize the protocol matcher.
************************************************************************/
private void extractProtocolFilter() {
int protocolIndex = this.matchTo.indexOf(PROTOCOL_ENDING);
if (protocolIndex != -1) {
this.protocolFilter = this.matchTo.substring(0, protocolIndex);
this.matchTo = this.matchTo.substring(protocolIndex+PROTOCOL_ENDING.length());
}
}
/*************************************************************************
* accept
* @see com.btr.proxy.util.UriFilter#accept(java.net.URI)
************************************************************************/
public boolean accept(URI uri) {
if (uri == null || uri.getAuthority() == null) {
return false;
}
if (!isProtocolMatching(uri)) {
return false;
}
String host = uri.getAuthority();
// Strip away port.
int index = host.indexOf(':');
if (index != -1) {
host = host.substring(0, index);
}
switch (this.mode) {
case BEGINS_WITH :
return host.toLowerCase().startsWith(this.matchTo);
case ENDS_WITH :
return host.toLowerCase().endsWith(this.matchTo);
case REGEX :
return host.toLowerCase().matches(this.matchTo);
}
return false;
}
/*************************************************************************
* Applies the protocol filter if available to see if we have a match.
* @param uri to test for a correct protocol.
* @return true if passed else false.
************************************************************************/
private boolean isProtocolMatching(URI uri) {
return this.protocolFilter == null
|| uri.getScheme() == null
|| uri.getScheme().equalsIgnoreCase(this.protocolFilter);
}
}
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