/*
    * ====================================================================
    * 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));
     }
 
 }