Java tutorial
/** * Copyright 2002 Instituto Superior Tcnico * * This file is part of FenixEdu Core. * * FenixEdu Core is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * FenixEdu Core is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with FenixEdu Core. If not, see <http://www.gnu.org/licenses/>. */ package net.sourceforge.fenixedu.presentationTier.Action; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.fortuna.ical4j.model.Calendar; import net.sourceforge.fenixedu.domain.Attends; import net.sourceforge.fenixedu.domain.ExecutionCourse; import net.sourceforge.fenixedu.domain.ExecutionSemester; import net.sourceforge.fenixedu.domain.Lesson; import net.sourceforge.fenixedu.domain.Professorship; import net.sourceforge.fenixedu.domain.Project; import net.sourceforge.fenixedu.domain.Shift; import net.sourceforge.fenixedu.domain.WrittenEvaluation; import net.sourceforge.fenixedu.domain.person.RoleType; import net.sourceforge.fenixedu.domain.student.Registration; import net.sourceforge.fenixedu.domain.util.icalendar.CalendarFactory; import net.sourceforge.fenixedu.domain.util.icalendar.EventBean; import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction; import net.sourceforge.fenixedu.presentationTier.Action.exceptions.FenixActionException; import net.sourceforge.fenixedu.presentationTier.Action.student.ICalStudentTimeTable; import org.apache.commons.lang.CharEncoding; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.fenixedu.bennu.core.domain.User; import org.fenixedu.bennu.core.util.CoreConfiguration; import org.joda.time.DateTime; import pt.ist.fenixWebFramework.struts.annotations.Mapping; import pt.ist.fenixframework.DomainObject; import pt.ist.fenixframework.FenixFramework; @Mapping(path = "/iCalendarSync", module = "external") public class ICalendarSyncPoint extends FenixDispatchAction { private Calendar getClassCalendar(User user, DateTime validity, HttpServletRequest request) { List<EventBean> allEvents = getClasses(user); String url = CoreConfiguration.getConfiguration().applicationUrl() + "/login"; EventBean event = new EventBean("Renovar a chave do calendario.", validity.minusMinutes(30), validity.plusMinutes(30), false, null, url, "A sua chave de sincronizao do calendario vai expirar. Diriga-se ao Fnix para gerar nova chave"); allEvents.add(event); return CalendarFactory.createCalendar(allEvents); } public List<EventBean> getClasses(User user) { List<EventBean> allEvents = new ArrayList<EventBean>(); ExecutionSemester currentExecutionSemester = ExecutionSemester.readActualExecutionSemester(); for (Registration registration : user.getPerson().getStudent().getRegistrationsSet()) { for (Shift shift : registration.getShiftsForCurrentExecutionPeriod()) { for (Lesson lesson : shift.getAssociatedLessonsSet()) { allEvents.addAll(lesson.getAllLessonsEvents()); } } for (Shift shift : registration.getShiftsFor(currentExecutionSemester.getPreviousExecutionPeriod())) { for (Lesson lesson : shift.getAssociatedLessonsSet()) { allEvents.addAll(lesson.getAllLessonsEvents()); } } } return allEvents; } public List<EventBean> getTeachingClasses(User user) { List<EventBean> allEvents = new ArrayList<EventBean>(); for (Professorship professorShip : user.getPerson().getProfessorshipsSet()) { ExecutionCourse executionCourse = professorShip.getExecutionCourse(); for (Lesson lesson : executionCourse.getLessons()) { allEvents.addAll(lesson.getAllLessonsEvents()); } } return allEvents; } private Calendar getExamsCalendar(User user, DateTime validity, HttpServletRequest request) { List<EventBean> allEvents = getExams(user); String url = CoreConfiguration.getConfiguration().applicationUrl() + "/login"; EventBean event = new EventBean("Renovar a chave do calendario.", validity.minusMinutes(30), validity.plusMinutes(30), false, null, url, "A sua chave de sincronizao do calendario vai expirar. Diriga-se ao Fnix para gerar nova chave"); allEvents.add(event); return CalendarFactory.createCalendar(allEvents); } public List<EventBean> getExams(User user) { List<EventBean> allEvents = new ArrayList<EventBean>(); ExecutionSemester currentExecutionSemester = ExecutionSemester.readActualExecutionSemester(); for (Registration registration : user.getPerson().getStudent().getRegistrationsSet()) { for (WrittenEvaluation writtenEvaluation : registration .getWrittenEvaluations(currentExecutionSemester)) { allEvents.addAll(writtenEvaluation.getAllEvents(registration)); } for (Attends attends : registration.getAttendsForExecutionPeriod(currentExecutionSemester)) { for (Project project : attends.getExecutionCourse().getAssociatedProjects()) { allEvents.addAll(project.getAllEvents(attends.getExecutionCourse())); } } for (WrittenEvaluation writtenEvaluation : registration .getWrittenEvaluations(currentExecutionSemester.getPreviousExecutionPeriod())) { allEvents.addAll(writtenEvaluation.getAllEvents(registration)); } for (Attends attends : registration .getAttendsForExecutionPeriod(currentExecutionSemester.getPreviousExecutionPeriod())) { for (Project project : attends.getExecutionCourse().getAssociatedProjects()) { allEvents.addAll(project.getAllEvents(attends.getExecutionCourse())); } } } return allEvents; } public List<EventBean> getTeachingExams(User user) { List<EventBean> allEvents = new ArrayList<EventBean>(); for (Professorship professorShip : user.getPerson().getProfessorshipsSet()) { ExecutionCourse executionCourse = professorShip.getExecutionCourse(); for (WrittenEvaluation writtenEvaluation : executionCourse.getWrittenEvaluations()) { allEvents.addAll(writtenEvaluation.getAllEvents(null)); } for (Project project : executionCourse.getAssociatedProjects()) { allEvents.addAll(project.getAllEvents(executionCourse)); } } return allEvents; } private Calendar getCalendar(String method, User user, DateTime validity, HttpServletRequest request) throws FenixActionException { if (method == "syncClasses") { return getClassCalendar(user, validity, request); } else if (method == "syncExams") { return getExamsCalendar(user, validity, request); } else { throw new FenixActionException("unexpected.syncing.method"); } } private void sync(HttpServletRequest request, final HttpServletResponse httpServletResponse, String method) throws FenixActionException, Exception { String userId = request.getParameter("user"); String payload = request.getParameter("payload"); String regId = request.getParameter("registrationID"); if (userId == null || payload == null || regId == null) { throw new FenixActionException("error.expecting.parameter.not.found"); } final DomainObject object = FenixFramework.getDomainObject(regId); if (object instanceof Registration) { User user = User.findByUsername(userId); Registration registration = (Registration) object; if (user.getPrivateKey() != null && user.getPrivateKey().getPrivateKeyValidity() != null) { if (payload.equals(ICalStudentTimeTable.calculatePayload(method, registration, user))) { if (user.getPrivateKey().getPrivateKeyValidity().isBeforeNow()) { returnError(httpServletResponse, "private.key.validity.expired"); } else { if (user.getPerson().hasRole(RoleType.STUDENT)) { encodeAndTransmitResponse(httpServletResponse, getCalendar(method, user, user.getPrivateKey().getPrivateKeyValidity(), request)); } else { returnError(httpServletResponse, "user.is.not.student"); } } } else { returnError(httpServletResponse, "payload.checksum.doesnt.match"); } } else { returnError(httpServletResponse, "key.not.found"); } } else { returnError(httpServletResponse, "invalid.request"); } } public ActionForward syncExams(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, final HttpServletResponse httpServletResponse) throws Exception { sync(request, httpServletResponse, "syncExams"); return null; } public ActionForward syncClasses(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, final HttpServletResponse httpServletResponse) throws Exception { sync(request, httpServletResponse, "syncClasses"); return null; } @SuppressWarnings("deprecation") private void returnError(HttpServletResponse httpServletResponse, String error) throws IOException { httpServletResponse.setStatus(500, error); httpServletResponse.getWriter().write(""); } private void encodeAndTransmitResponse(HttpServletResponse httpServletResponse, Calendar calendar) throws Exception { httpServletResponse.setHeader("Content-Type", "text/calendar; charset=" + CharEncoding.UTF_8); final OutputStream outputStream = httpServletResponse.getOutputStream(); outputStream.write(calendar.toString().getBytes(CharEncoding.UTF_8)); outputStream.close(); } }