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Java example source code file (RFC2965DomainAttributeHandler.java)

This example source code file (RFC2965DomainAttributeHandler.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

blank, clientcookie, cookie, cookieattributehandler, cookieorigin, domain, illegalargumentexception, immutable, invalid, malformedcookieexception, missing, rfc, rfc2965domainattributehandler, string, util

The RFC2965DomainAttributeHandler.java example source code

/*
 * ====================================================================
 * 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.Locale;

import org.apache.http.annotation.Immutable;

import org.apache.http.cookie.ClientCookie;
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;

/**
 * <tt>"Domain" cookie attribute handler for RFC 2965 cookie spec.
 * 
 *
 * @since 3.1
 */
@Immutable
public class RFC2965DomainAttributeHandler implements CookieAttributeHandler {

    public RFC2965DomainAttributeHandler() {
        super();
    }

    /**
     * Parse cookie domain attribute.
     */
    public void parse(final SetCookie cookie, String domain)
            throws MalformedCookieException {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (domain == null) {
            throw new MalformedCookieException(
                    "Missing value for domain attribute");
        }
        if (domain.trim().length() == 0) {
            throw new MalformedCookieException(
                    "Blank value for domain attribute");
        }
        domain = domain.toLowerCase(Locale.ENGLISH);
        if (!domain.startsWith(".")) {
            // Per RFC 2965 section 3.2.2
            // "... If an explicitly specified value does not start with
            // a dot, the user agent supplies a leading dot ..."
            // That effectively implies that the domain attribute 
            // MAY NOT be an IP address of a host name
            domain = '.' + domain;
        }
        cookie.setDomain(domain);
    }

    /**
     * Performs domain-match as defined by the RFC2965.
     * <p>
     * Host A's name domain-matches host B's if
     * <ol>
     *   <ul>their host name strings string-compare equal; or
     *   <ul>A is a HDN string and has the form NB, where N is a non-empty
     *       name string, B has the form .B', and B' is a HDN string.  (So,
     *       x.y.com domain-matches .Y.com but not Y.com.)</ul>
     * </ol>
     *
     * @param host host name where cookie is received from or being sent to.
     * @param domain The cookie domain attribute.
     * @return true if the specified host matches the given domain.
     */
    public boolean domainMatch(String host, String domain) {
        boolean match = host.equals(domain)
                        || (domain.startsWith(".") && host.endsWith(domain));

        return match;
    }

    /**
     * Validate cookie domain attribute.
     */
    public void validate(final Cookie cookie, final CookieOrigin origin)
            throws MalformedCookieException {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (origin == null) {
            throw new IllegalArgumentException("Cookie origin may not be null");
        }
        String host = origin.getHost().toLowerCase(Locale.ENGLISH);
        if (cookie.getDomain() == null) {
            throw new MalformedCookieException("Invalid cookie state: " +
                                               "domain not specified");
        }
        String cookieDomain = cookie.getDomain().toLowerCase(Locale.ENGLISH);

        if (cookie instanceof ClientCookie 
                && ((ClientCookie) cookie).containsAttribute(ClientCookie.DOMAIN_ATTR)) {
            // Domain attribute must start with a dot
            if (!cookieDomain.startsWith(".")) {
                throw new MalformedCookieException("Domain attribute \"" +
                    cookie.getDomain() + "\" violates RFC 2109: domain must start with a dot");
            }

            // Domain attribute must contain at least one embedded dot,
            // or the value must be equal to .local.
            int dotIndex = cookieDomain.indexOf('.', 1);
            if (((dotIndex < 0) || (dotIndex == cookieDomain.length() - 1))
                && (!cookieDomain.equals(".local"))) {
                throw new MalformedCookieException(
                        "Domain attribute \"" + cookie.getDomain()
                        + "\" violates RFC 2965: the value contains no embedded dots "
                        + "and the value is not .local");
            }

            // The effective host name must domain-match domain attribute.
            if (!domainMatch(host, cookieDomain)) {
                throw new MalformedCookieException(
                        "Domain attribute \"" + cookie.getDomain()
                        + "\" violates RFC 2965: effective host name does not "
                        + "domain-match domain attribute.");
            }

            // effective host name minus domain must not contain any dots
            String effectiveHostWithoutDomain = host.substring(
                    0, host.length() - cookieDomain.length());
            if (effectiveHostWithoutDomain.indexOf('.') != -1) {
                throw new MalformedCookieException("Domain attribute \""
                                                   + cookie.getDomain() + "\" violates RFC 2965: "
                                                   + "effective host minus domain may not contain any dots");
            }
        } else {
            // Domain was not specified in header. In this case, domain must
            // string match request host (case-insensitive).
            if (!cookie.getDomain().equals(host)) {
                throw new MalformedCookieException("Illegal domain attribute: \""
                                                   + cookie.getDomain() + "\"."
                                                   + "Domain of origin: \""
                                                   + host + "\"");
            }
        }
    }

    /**
     * Match cookie domain attribute.
     */
    public boolean match(final Cookie cookie, final CookieOrigin origin) {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (origin == null) {
            throw new IllegalArgumentException("Cookie origin may not be null");
        }
        String host = origin.getHost().toLowerCase(Locale.ENGLISH);
        String cookieDomain = cookie.getDomain();

        // The effective host name MUST domain-match the Domain
        // attribute of the cookie.
        if (!domainMatch(host, cookieDomain)) {
            return false;
        }
        // effective host name minus domain must not contain any dots
        String effectiveHostWithoutDomain = host.substring(
                0, host.length() - cookieDomain.length());
        return effectiveHostWithoutDomain.indexOf('.') == -1;
    }

}

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