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/*
 * Copyright 2012 Google Inc.
 *
 * 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 com.google.gwt.core.server;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Base servlet for GWT server-side code which extracts properties from the
 * request and sets them for this thread.
 * 

* For now, subclasses should override {@link #init()} and set the locale * configuration fields - eventually this will be read from a deploy artifact. */ public class GwtServletBase extends HttpServlet { // These defaults should be kept in sync with I18N.gwt.xml protected String[] localeSearchOrder = new String[] { "queryparam", "cookie", "meta", "useragent", }; protected String defaultLocale = "default"; protected String localeCookie = null; protected String localeQueryParam = "locale"; @Override public void init() throws ServletException { // TODO(jat): implement reading config from a deploy artifact } /** * Fetch a cookie from the HTTP request. * * @param req * @param cookieName * @return the value of the cookie or null if not found */ protected final String getCookie(HttpServletRequest req, String cookieName) { Cookie[] cookies = req.getCookies(); if (cookies == null) { return null; } for (Cookie cookie : cookies) { if (cookie.getName().equals(cookieName)) { return cookie.getValue(); } } return null; } /** * Get the GWT locale to use from this request. * * @param req * @return the GWT locale to use as a String */ protected String getGwtLocale(HttpServletRequest req) { // set the locale String locale = null; for (String localeMethod : localeSearchOrder) { if ("cookie".equals(localeMethod)) { if (localeCookie != null) { locale = getCookie(req, localeCookie); } } else if ("queryparam".equals(localeMethod)) { if (localeQueryParam != null) { locale = req.getParameter(localeQueryParam); } } else if ("useragent".equals(localeMethod)) { // TODO(jat): implement Accept-Language processing } else if ("usemeta".equals(localeMethod)) { // ignored on the server } else { // TODO(jat): log ignored method? } if (locale != null) { return locale; } } return defaultLocale; } @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { setGwtProperties(req); super.service(req, resp); } /** * Sets all GWT properties from the request. *

* If this method is overridden, this version should be called first and then * any modifications to property values should be done. * * @param req */ protected void setGwtProperties(HttpServletRequest req) { ServerGwtBridge.getInstance().setThreadProperty("locale", getGwtLocale(req)); // TODO(jat): other properties, such as user.agent? } }





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