/*
 * ====================================================================
 * 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;

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

    public BasicPathHandler() {
        super();
    }

    public void parse(final SetCookie cookie, String value)
            throws MalformedCookieException {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (value == null || value.trim().length() == 0) {
            value = "/";
        }
        cookie.setPath(value);
    }

    public void validate(final Cookie cookie, final CookieOrigin origin)
            throws MalformedCookieException {
        if (!match(cookie, origin)) {
            throw new CookieRestrictionViolationException(
                "Illegal path attribute \"" + cookie.getPath()
                + "\". Path of origin: \"" + origin.getPath() + "\"");
        }
    }

    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 targetpath = origin.getPath();
        String topmostPath = cookie.getPath();
        if (topmostPath == null) {
            topmostPath = "/";
        }
        if (topmostPath.length() > 1 && topmostPath.endsWith("/")) {
            topmostPath = topmostPath.substring(0, topmostPath.length() - 1);
        }
        boolean match = targetpath.startsWith (topmostPath);
        // if there is a match and these values are not exactly the same we have
        // to make sure we're not matcing "/foobar" and "/foo"
        if (match && targetpath.length() != topmostPath.length()) {
            if (!topmostPath.endsWith("/")) {
                match = (targetpath.charAt(topmostPath.length()) == '/');
            }
        }
        return match;
    }

}
