Java tutorial
/* Copyright (c) 2008 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 mashups.eventpub; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.LinkedList; import java.util.List; import javax.servlet.RequestDispatcher; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.configuration.Configuration; import org.apache.commons.configuration.PropertiesConfiguration; /** * Servlet to control requests for publishing events from Spreadsheets to * Calendar and Base. * * */ public class EventPublisherServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { public static final long serialVersionUID = 1; /** * The session attribute in which to store the AuthSub token. The * AuthSub token, after being upgraded from a single-use to a session token, * is held between the requests using the servlet container's session * management capability. */ public static final String SESSION_ATTR_SS_AUTH_TOKEN = "ssAuthSubToken"; /** * Names of other session attributes */ public static final String SESSION_ATTR_SS_CELL_FEED = "ssCellFeed"; public static final String SESSION_ATTR_FIELD_MAP = "fieldMap"; public static final String SESSION_ATTR_EVENTS_TO_PUBLISH = "eventsToPublish"; private Configuration config; public EventPublisherServlet() throws Exception { super(); config = new PropertiesConfiguration("EventPublisher.properties"); } private String getCurrentUrl(HttpServletRequest request) throws MalformedURLException { URL currentUrl = new URL(request.getScheme(), request.getServerName(), request.getServerPort(), request.getRequestURI()); return currentUrl.toString(); } /** * Save AuthSubToken into session * * @param request The request * @param response The response */ private void processAcceptAuthSubToken(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* * Request is caused by a user being redirected back from AuthSub login */ if (request.getParameter("token") != null) { EventPublisher ep = new EventPublisher(); try { ep.setSsAuthSubToken(request.getParameter("token"), true); request.getSession().setAttribute(SESSION_ATTR_SS_AUTH_TOKEN, ep.getSsAuthSubToken()); /* * Redirect to clear the token from the URL and list available * spreadsheets. */ response.sendRedirect("?action=outputSsList"); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } } } /** * Default action - output intro page * * @param request The request * @param response The response */ private void processOutputIntroPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String ssAuthUrl = EventPublisher.getSsAuthSubUrl(getCurrentUrl(request) + "?action=acceptAuthSubToken"); request.setAttribute("ssAuthUrl", ssAuthUrl); RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/outputIntroPage.jsp"); dispatcher.forward(request, response); } /** * Output list of spreadsheets owned by authenticated account * * @param request The request * @param response The response */ private void processOutputSsList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { EventPublisher ep = new EventPublisher(); try { ep.setSsAuthSubToken((String) request.getSession().getAttribute(SESSION_ATTR_SS_AUTH_TOKEN), false); request.setAttribute("ssList", ep.getSsList()); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/outputSsList.jsp"); dispatcher.forward(request, response); } /** * Output list of worksheets in chosen spreadsheet * * @param request The request * @param response The response */ private void processOutputWsList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { EventPublisher ep = new EventPublisher(); try { ep.setSsAuthSubToken((String) request.getSession().getAttribute(SESSION_ATTR_SS_AUTH_TOKEN), false); request.setAttribute("token", ep.getSsAuthSubToken()); request.setAttribute("wsList", ep.getWsList((String) request.getParameter("wsFeed"))); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/outputWsList.jsp"); dispatcher.forward(request, response); } /** * Output list of columns in chosen worksheet * * @param request The request * @param response The response */ private void processOutputColumnList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { EventPublisher ep = new EventPublisher(); try { ep.setSsAuthSubToken((String) request.getSession().getAttribute(SESSION_ATTR_SS_AUTH_TOKEN), false); request.setAttribute("token", ep.getSsAuthSubToken()); request.setAttribute("columnList", ep.getColumnList((String) request.getParameter("cellFeed"))); request.getSession().setAttribute(SESSION_ATTR_SS_CELL_FEED, (String) request.getParameter("cellFeed")); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } RequestDispatcher dispatcher = getServletContext() .getRequestDispatcher("/WEB-INF/jsp/outputColumnList.jsp"); dispatcher.forward(request, response); } /** * Lists events to be published and also sets the custom field map. * * @param request The request * @param response The response */ private void processListEvents(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { EventPublisher ep = new EventPublisher(); /* * Set the EventPublisher's list feed */ ep.setSsUrl( ((String) request.getSession().getAttribute(SESSION_ATTR_SS_CELL_FEED)).replace("cells", "list")); if (request.getParameter("fdTitle") != null) { SpreadsheetCustomFieldMap fieldMap = new SpreadsheetCustomFieldMap( (String) request.getParameter("fdTitle"), (String) request.getParameter("fdDescription"), (String) request.getParameter("fdStartDate"), (String) request.getParameter("fdEndDate"), (String) request.getParameter("fdLocation"), (String) request.getParameter("fdWebSite"), (String) request.getParameter("fdCalendarUrl"), (String) request.getParameter("fdBaseUrl")); ep.setFieldMap(fieldMap); request.getSession().setAttribute(SESSION_ATTR_FIELD_MAP, fieldMap); } else { ep.setFieldMap((SpreadsheetCustomFieldMap) request.getSession().getAttribute(SESSION_ATTR_FIELD_MAP)); } try { ep.setSsAuthSubToken((String) request.getSession().getAttribute(SESSION_ATTR_SS_AUTH_TOKEN), false); List<Event> listEvents = ep.getEventsFromSpreadsheet(); request.setAttribute("events", listEvents); request.getSession().setAttribute(SESSION_ATTR_EVENTS_TO_PUBLISH, listEvents); javax.servlet.RequestDispatcher dispatcher = getServletContext() .getRequestDispatcher("/WEB-INF/jsp/outputEventList.jsp"); dispatcher.forward(request, response); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } } /** * Publish all events to Calendar and/or Base * * @param request The request * @param response The response */ @SuppressWarnings("unchecked") private void processPublishEvents(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { EventPublisher ep = new EventPublisher(); ep.setFieldMap((SpreadsheetCustomFieldMap) request.getSession().getAttribute(SESSION_ATTR_FIELD_MAP)); try { ep.setSsAuthSubToken((String) request.getSession().getAttribute(SESSION_ATTR_SS_AUTH_TOKEN), false); } catch (EPAuthenticationException e) { System.err.println("Authentication exception: " + e.getMessage()); } LinkedList<Event> eventList = (LinkedList<Event>) request.getSession() .getAttribute(SESSION_ATTR_EVENTS_TO_PUBLISH); if (request.getParameter("calendar") != null && "checked".equals(request.getParameter("calendar"))) { String calUsername = config.getString("calendar.username"); String calPassword = config.getString("calendar.password"); String calUrl = config.getString("calendar.url"); ep.setCalUsernamePassword(calUsername, calPassword); ep.setCalUrl(calUrl); ep.publishEventsToCalendar(eventList); } if (request.getParameter("base") != null && "checked".equals(request.getParameter("base"))) { String baseUsername = config.getString("gbase.username"); String basePassword = config.getString("gbase.password"); ep.setBaseUsernamePassword(baseUsername, basePassword); ep.publishEventsToBase(eventList); } javax.servlet.RequestDispatcher dispatcher = getServletContext() .getRequestDispatcher("/WEB-INF/jsp/outputPublishingResults.jsp"); dispatcher.forward(request, response); } /** * Process all requests to this servlet * * @param request The request * @param response The response */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* * Determine action attempted */ String action = (request.getParameter("action")) == null ? "outputIntroPage" : request.getParameter("action"); if ("outputIntroPage".equals(action)) { processOutputIntroPage(request, response); } else if ("acceptAuthSubToken".equals(action)) { processAcceptAuthSubToken(request, response); } else if ("outputSsList".equals(action)) { processOutputSsList(request, response); } else if ("outputWsList".equals(action)) { processOutputWsList(request, response); } else if ("outputColumnList".equals(action)) { processOutputColumnList(request, response); } else if ("listEvents".equals(action)) { processListEvents(request, response); } else if ("publish".equals(action)) { processPublishEvents(request, response); } } /** * Process GET requests by calling the doPost method * * @param request The request * @param response The response */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } }