Java tutorial
/** * Copyright 2005-2014 Red Hat, Inc. * * Red Hat 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 com.beyondjservlet.gateway.servlet.support; import org.apache.commons.httpclient.Header; import javax.servlet.http.HttpServletResponse; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * Utility methods for Proxy related operations. */ public final class ProxySupport { public static final String JSESSIONID = "JSESSIONID"; private static final Pattern PATH_AND_DOMAIN_PATTERN = Pattern .compile("(?:;\\s*([pP]ath|[dD]omain)=([^;\\s]+))"); private ProxySupport() { } /** * Checks if the passed-in header is a hop-by-hop header as defined by * <a href="http://tools.ietf.org/html/rfc2616#section-13.5.1">RFC-2616 Section 13.5.1</a>. * * @param header the header name to check. * @return {@code true} if the header is a hop-by-hop header, false otherwise. */ public static boolean isHopByHopHeader(final String header) { return header.equalsIgnoreCase("Connection") || header.equalsIgnoreCase("Keep-Alive") || header.equalsIgnoreCase("Proxy-Authentication") || header.equalsIgnoreCase("Proxy-Authorization") || header.equalsIgnoreCase("TE") || header.equalsIgnoreCase("Trailers") || header.equalsIgnoreCase("Transfer-Encoding") || header.equalsIgnoreCase("Upgrade"); } /** * Returns the contents of a {@code Set-Cookie} header with it's optional {@code path} and * {@code domain} attributes replaced by the passed in values. * * @param header the {@code Set-Cookie} header for which {@code path} and {@code domain} should be replaced. * @param path the new path for the cookie. If null the original value of for path is used. * @param domain the domain for the cookie. If null the original value of for domain is used. * @return {@code String} the contents of the {@code Set-Cookie} header. The reason for not returning the complete * header including the headers name (Set-Cookie) is make this method useful with the * Java Servlet API and {@link HttpServletResponse#setHeader(String, String)}. */ public static String replaceCookieAttributes(final String header, final String path, final String domain) { final Matcher m = PATH_AND_DOMAIN_PATTERN.matcher(header); final StringBuffer sb = new StringBuffer(); while (m.find()) { final String name = m.group(1); if ("domain".equalsIgnoreCase(name)) { appendReplacement(m, sb, name, domain); } else if ("path".equalsIgnoreCase(name)) { appendReplacement(m, sb, name, path); } } m.appendTail(sb); return sb.toString(); } private static void appendReplacement(final Matcher m, final StringBuffer sb, final String name, final String value) { m.appendReplacement(sb, ';' + name + '=' + (value == null ? m.group(2) : value)); } /** * Determines whether the passed-in header is a 'Set-Cookie' header. * * @param header the {@link Header} to check * @return {@code true} if the header is a 'Set-Cookie' header, false otherwise. */ public static boolean isSetCookieHeader(final Header header) { return header.getName().equalsIgnoreCase("Set-Cookie"); } }