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package com.btr.proxy.selector.whitelist;
import java.util.ArrayList;
import java.util.List;
import com.btr.proxy.selector.whitelist.HostnameFilter.Mode;
import com.btr.proxy.util.UriFilter;
/*****************************************************************************
* Default implementation for an white list parser. This will support the most
* common forms of filters found in white lists.
* The white list is a comma (or space) separated list of domain names or IP addresses.
* The following section shows some examples.
*
* .mynet.com - Filters all host names ending with .mynet.com
* *.mynet.com - Filters all host names ending with .mynet.com
* www.mynet.* - Filters all host names starting with www.mynet.
* 123.12.32.1 - Filters the IP 123.12.32.1
* 123.12.32.1/255 - Filters the IP range
* http://www.mynet.com - Filters only HTTP protocol not FTP and no HTTPS
*
* Example of a list:
*
* .mynet.com, *.my-other-net.org, 123.55.23.222, 123.55.23.0/24
*
* Some info about this topic can be found here:
* http://kb.mozillazine.org/No_proxy_for
* http://technet.microsoft.com/en-us/library/dd361953.aspx
*
* Note that this implementation does not cover all variations of all browsers
* but should cover the most used formats.
*
* @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
****************************************************************************/
public class DefaultWhiteListParser implements WhiteListParser {
/*************************************************************************
* parseWhiteList
* @see com.btr.proxy.selector.whitelist.WhiteListParser#parseWhiteList(java.lang.String)
************************************************************************/
public List<UriFilter> parseWhiteList(String whiteList) {
List<UriFilter> result = new ArrayList<UriFilter>();
String[] token = whiteList.split("[, ]+");
for (int i = 0; i < token.length; i++) {
String tkn = token[i].trim();
if (isIP4SubnetFilter(tkn)) {
result.add(new IpRangeFilter(tkn));
continue;
} else
if (tkn.endsWith("*")) {
tkn = tkn.substring(0, tkn.length()-1);
result.add(new HostnameFilter(Mode.BEGINS_WITH, tkn));
continue;
} else
if (tkn.trim().startsWith("*")) {
tkn = tkn.substring(1);
result.add(new HostnameFilter(Mode.ENDS_WITH, tkn));
} else {
result.add(new HostnameFilter(Mode.ENDS_WITH, tkn));
}
}
return result;
}
/*************************************************************************
* @param token
* @return
************************************************************************/
private boolean isIP4SubnetFilter(String token) {
return IPv4WithSubnetChecker.isValid(token);
}
}
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