/*
 * 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.
 */
package org.krakenapps.http.internal.handler;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.krakenapps.http.internal.context.KrakenServletContext;

import java.io.IOException;

public final class FilterHandler extends AbstractHandler implements Comparable<FilterHandler> {
	private final Filter filter;
	private final String pattern;
	private final int ranking;

	public FilterHandler(KrakenServletContext context, Filter filter, String pattern, int ranking) {
		super(context);
		this.filter = filter;
		this.pattern = pattern;
		this.ranking = ranking;
	}

	public Filter getFilter() {
		return this.filter;
	}

	public void init() throws ServletException {
		String name = "filter_" + getId();
		FilterConfig config = new FilterConfigImpl(name, getContext(), getInitParams());
		this.filter.init(config);
	}

	public void destroy() {
		this.filter.destroy();
	}

	public boolean matches(String uri) {
		return uri.matches(this.pattern);
	}

	public void handle(HttpServletRequest req, HttpServletResponse res, FilterChain chain)
			throws ServletException, IOException {
		final boolean matches = matches(req.getPathInfo());
		if (matches) {
			doHandle(req, res, chain);
		} else {
			chain.doFilter(req, res);
		}
	}

	private void doHandle(HttpServletRequest req, HttpServletResponse res, FilterChain chain)
			throws ServletException, IOException {
		if (!getContext().handleSecurity(req, res)) {
			res.sendError(HttpServletResponse.SC_FORBIDDEN);
		} else {
			this.filter.doFilter(req, res, chain);
		}
	}

	public int compareTo(FilterHandler other) {
		return other.ranking - this.ranking;
	}
}