/* Licensed 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.
 */
package org.riotfamily.crawler;

import org.riotfamily.common.web.support.ServletUtils;

/**
 * @author Felix Gnass [fgnass at neteye dot de]
 * @since 7.0
 */
public class LocalLinkFilter implements LinkFilter {

	public boolean accept(String base, String href) {
		if (!ServletUtils.isAbsoluteUrl(href)) {
			// Always follow relative links
			return true;
		}
		String host = ServletUtils.getHost(href);
		if (host == null) {
			// Scheme but no host - must be something link javascript: or mailto:
			return false;
		}
		if (base != null) {
			String baseHost = ServletUtils.getHost(base);
			if (host.equals(baseHost)) {
				// Absolute link to same host so we follow it ...
				return true;
			}
		}
		return false;
	}

}