/*
 * ====================================================================
 * 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 org.apache.http.annotation.Immutable;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieAttributeHandler;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.cookie.CookieRestrictionViolationException;
import org.apache.http.cookie.MalformedCookieException;
import org.apache.http.cookie.SetCookie;
import org.apache.http.util.Args;

/**
 *
 * @since 4.0
 */
@Immutable
public class BasicDomainHandler implements CookieAttributeHandler {

    public BasicDomainHandler() {
        super();
    }

    public void parse(final SetCookie cookie, final String value)
            throws MalformedCookieException {
        Args.notNull(cookie, "Cookie");
        if (value == null) {
            throw new MalformedCookieException("Missing value for domain attribute");
        }
        if (value.trim().length() == 0) {
            throw new MalformedCookieException("Blank value for domain attribute");
        }
        cookie.setDomain(value);
    }

    public void validate(final Cookie cookie, final CookieOrigin origin)
            throws MalformedCookieException {
        Args.notNull(cookie, "Cookie");
        Args.notNull(origin, "Cookie origin");
        // Validate the cookies domain attribute.  NOTE:  Domains without
        // any dots are allowed to support hosts on private LANs that don't
        // have DNS names.  Since they have no dots, to domain-match the
        // request-host and domain must be identical for the cookie to sent
        // back to the origin-server.
        final String host = origin.getHost();
        String domain = cookie.getDomain();
        if (domain == null) {
            throw new CookieRestrictionViolationException("Cookie domain may not be null");
        }
        if (host.contains(".")) {
            // Not required to have at least two dots.  RFC 2965.
            // A Set-Cookie2 with Domain=ajax.com will be accepted.

            // domain must match host
            if (!host.endsWith(domain)) {
                if (domain.startsWith(".")) {
                    domain = domain.substring(1, domain.length());
                }
                if (!host.equals(domain)) {
                    throw new CookieRestrictionViolationException(
                        "Illegal domain attribute \"" + domain
                        + "\". Domain of origin: \"" + host + "\"");
                }
            }
        } else {
            if (!host.equals(domain)) {
                throw new CookieRestrictionViolationException(
                    "Illegal domain attribute \"" + domain
                    + "\". Domain of origin: \"" + host + "\"");
            }
        }
    }

    public boolean match(final Cookie cookie, final CookieOrigin origin) {
        Args.notNull(cookie, "Cookie");
        Args.notNull(origin, "Cookie origin");
        final String host = origin.getHost();
        String domain = cookie.getDomain();
        if (domain == null) {
            return false;
        }
        if (host.equals(domain)) {
            return true;
        }
        if (!domain.startsWith(".")) {
            domain = '.' + domain;
        }
        return host.endsWith(domain) || host.equals(domain.substring(1));
    }

}
