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Java example source code file (PublicSuffixFilter.java)

This example source code file (PublicSuffixFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

cookieattributehandler, cookieorigin, hashset, malformedcookieexception, publicsuffixfilter, string, util

The PublicSuffixFilter.java example source code

/*
 * $HeadURL$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.cookie;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.apache.http.client.utils.Punycode;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieAttributeHandler;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.cookie.MalformedCookieException;
import org.apache.http.cookie.SetCookie;

/**
 * Wraps a CookieAttributeHandler and leverages its match method
 * to never match a suffix from a black list. May be used to provide
 * additional security for cross-site attack types by preventing
 * cookies from apparent domains that are not publicly available.
 * An uptodate list of suffixes can be obtained from 
 * <a href="http://publicsuffix.org/">publicsuffix.org 
 *
 * @since 4.0
 */
public class PublicSuffixFilter implements CookieAttributeHandler {
    private final CookieAttributeHandler wrapped;
    private Set<String> exceptions;
    private Set<String> suffixes;

    public PublicSuffixFilter(CookieAttributeHandler wrapped) {
        this.wrapped = wrapped;
    }
   
    /**
     * Sets the suffix blacklist patterns.
     * A pattern can be "com", "*.jp"
     * TODO add support for patterns like "lib.*.us"
     * @param suffixes
     */
    public void setPublicSuffixes(Collection<String> suffixes) {
        this.suffixes = new HashSet<String>(suffixes);
    }
    
    /**
     * Sets the exceptions from the blacklist. Exceptions can not be patterns.
     * TODO add support for patterns
     * @param exceptions
     */
    public void setExceptions(Collection<String> exceptions) {
        this.exceptions = new HashSet<String>(exceptions);
    }

    /**
     * Never matches if the cookie's domain is from the blacklist.
     */
    public boolean match(Cookie cookie, CookieOrigin origin) {
        if (isForPublicSuffix(cookie)) return false;
        return wrapped.match(cookie, origin);
    }

    public void parse(SetCookie cookie, String value) throws MalformedCookieException {
        wrapped.parse(cookie, value);
    }

    public void validate(Cookie cookie, CookieOrigin origin) throws MalformedCookieException {
        wrapped.validate(cookie, origin);
    }
    
    private boolean isForPublicSuffix(Cookie cookie) {
        String domain = cookie.getDomain();
        if (domain.startsWith(".")) domain = domain.substring(1);
        domain = Punycode.toUnicode(domain);
        
        // An exception rule takes priority over any other matching rule.
        if (this.exceptions != null) {
            if (this.exceptions.contains(domain)) return false;
        }

        
        if (this.suffixes == null) return false;
        
        do {
            if (this.suffixes.contains(domain)) return true;
            // patterns
            if (domain.startsWith("*.")) domain = domain.substring(2);
            int nextdot = domain.indexOf('.');
            if (nextdot == -1) break;
            domain = "*" + domain.substring(nextdot);
        } while (domain.length() > 0);
        
        return false;
    }
}

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