/
YanelServlet.java
3061 lines (2733 loc) · 156 KB
/
YanelServlet.java
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/*
* See the NOTICE.txt file distributed with
* this work for additional information regarding copyright ownership.
* Wyona 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 org.wyona.yanel.servlet;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URL;
import java.util.Calendar;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamSource;
import org.wyona.commons.xml.XMLHelper;
import org.wyona.neutron.XMLExceptionV1;
import org.wyona.yanel.core.Environment;
import org.wyona.yanel.core.Path;
import org.wyona.yanel.core.Resource;
import org.wyona.yanel.core.ResourceConfiguration;
import org.wyona.yanel.core.ResourceNotFoundException;
import org.wyona.yanel.core.ResourceTypeIdentifier;
import org.wyona.yanel.core.ResourceTypeRegistry;
import org.wyona.yanel.core.StateOfView;
import org.wyona.yanel.core.ToolbarState;
import org.wyona.yanel.core.Yanel;
import org.wyona.yanel.core.api.attributes.AnnotatableV1;
import org.wyona.yanel.core.api.attributes.IntrospectableV1;
import org.wyona.yanel.core.api.attributes.ModifiableV1;
import org.wyona.yanel.core.api.attributes.ModifiableV2;
import org.wyona.yanel.core.api.attributes.TranslatableV1;
import org.wyona.yanel.core.api.attributes.VersionableV2;
import org.wyona.yanel.core.api.attributes.ViewableV1;
import org.wyona.yanel.core.api.attributes.ViewableV2;
import org.wyona.yanel.core.api.attributes.WorkflowableV1;
import org.wyona.yanel.core.api.security.WebAuthenticator;
import org.wyona.yanel.core.attributes.versionable.RevisionInformation;
import org.wyona.yanel.core.attributes.viewable.View;
import org.wyona.yanel.core.attributes.viewable.ViewDescriptor;
import org.wyona.yanel.core.attributes.tracking.TrackingInformationV1;
import org.wyona.yanel.core.navigation.Node;
import org.wyona.yanel.core.navigation.Sitetree;
import org.wyona.yanel.core.serialization.SerializerFactory;
import org.wyona.yanel.core.source.SourceResolver;
import org.wyona.yanel.core.source.YanelStreamSource;
import org.wyona.yanel.core.transformation.I18nTransformer2;
import org.wyona.yanel.core.util.DateUtil;
import org.wyona.yanel.core.util.HttpServletRequestHelper;
import org.wyona.yanel.core.workflow.Workflow;
import org.wyona.yanel.core.workflow.WorkflowException;
import org.wyona.yanel.core.workflow.WorkflowHelper;
import org.wyona.yanel.core.map.Map;
import org.wyona.yanel.core.map.Realm;
import org.wyona.yanel.core.util.ResourceAttributeHelper;
import org.wyona.yanel.impl.resources.BasicGenericExceptionHandlerResource;
import org.wyona.yanel.servlet.IdentityMap;
import org.wyona.yanel.servlet.communication.HttpRequest;
import org.wyona.yanel.servlet.communication.HttpResponse;
import org.wyona.yanel.servlet.security.impl.AutoLogin;
import org.wyona.security.core.api.Identity;
import org.wyona.security.core.api.Usecase;
import org.wyona.security.core.api.User;
import org.apache.log4j.Logger;
import org.apache.xalan.transformer.TransformerIdentityImpl;
import org.apache.xml.resolver.tools.CatalogResolver;
import org.apache.xml.serializer.Serializer;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SimpleTrigger;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;
/**
* Main entry of Yanel webapp
*/
public class YanelServlet extends HttpServlet {
private static Logger log = Logger.getLogger(YanelServlet.class);
private static Logger logAccess = Logger.getLogger(AccessLog.CATEGORY);
private static Logger log404 = Logger.getLogger("404");
private Map map;
private Yanel yanelInstance;
private Sitetree sitetree;
private File xsltInfoAndException;
private String xsltLoginScreenDefault;
private boolean displayMostRecentVersion = true;
public static final String MOBILE_KEY = "yanel.mobile";
public static final String IDENTITY_MAP_KEY = "identity-map";
private static final String TOOLBAR_USECASE = "toolbar"; //TODO is this the same as YanelAuthoringUI.TOOLBAR_KEY?
public static final String NAMESPACE = "http://www.wyona.org/yanel/1.0";
private static final String METHOD_PROPFIND = "PROPFIND";
private static final String METHOD_OPTIONS = "OPTIONS";
private static final String METHOD_GET = "GET";
private static final String METHOD_POST = "POST";
private static final String METHOD_PUT = "PUT";
private static final String METHOD_DELETE = "DELETE";
private static final String HTTP_REFERRER = "Referer"; // ah, misspellings, how I hate thee (http://en.wikipedia.org/wiki/Referer)!
private String sslPort = null;
private String toolbarMasterSwitch = "off";
private String reservedPrefix;
private String servletContextRealPath;
private int cacheExpires = 0;
private YanelHTMLUI yanelUI;
private boolean logAccessEnabled = false;
private boolean detectMobilePerRequest = false;
public static final String DEFAULT_ENCODING = "UTF-8";
public static final String YANEL_ACCESS_POLICY_USECASE = "yanel.policy";
public static final String YANEL_USECASE = "yanel.usecase";
public static final String YANEL_RESOURCE = "yanel.resource";
public static final String YANEL_RESOURCE_USECASE = YANEL_RESOURCE + ".usecase";
public static final String YANEL_RESOURCE_REVISION = YANEL_RESOURCE + ".revision";
public static final String YANEL_RESOURCE_WORKFLOW_TRANSITION = YANEL_RESOURCE + ".workflow.transition";
public static final String YANEL_RESOURCE_WORKFLOW_TRANSITION_OUTPUT = YANEL_RESOURCE_WORKFLOW_TRANSITION + ".output";
public static final String VIEW_ID_PARAM_NAME = "yanel.resource.viewid";
public static final String RESOURCE_META_ID_PARAM_NAME = "yanel.resource.meta";
public static final String RELEASE_LOCK = "release-lock";
private static final String CONTENT_TYPE_XHTML = "xhtml";
private static String ANALYTICS_COOKIE_NAME = "_yanel-analytics";
public static final String YANEL_LAST_ACCESS_ATTR = "_yanel-last-access";
private Scheduler scheduler;
private String[] mobileDevices;
private static String ACCESS_LOG_TAG_SEPARATOR;
/**
* @see javax.servlet.GenericServlet#init(ServletConfig)
*/
@Override
public void init(ServletConfig config) throws ServletException {
servletContextRealPath = config.getServletContext().getRealPath("/");
xsltInfoAndException = org.wyona.commons.io.FileUtil.file(servletContextRealPath, config.getInitParameter("exception-and-info-screen-xslt"));
xsltLoginScreenDefault = config.getInitParameter("login-screen-xslt");
displayMostRecentVersion = new Boolean(config.getInitParameter("workflow.not-live.most-recent-version")).booleanValue();
try {
yanelInstance = Yanel.getInstance();
yanelInstance.init(); // TODO: Tell Yanel about alternative directory to look for configuration files, e.g. (File) getServletContext().getAttribute("javax.servlet.context.tempdir")
map = yanelInstance.getMapImpl("map");
sitetree = yanelInstance.getSitetreeImpl("repo-navigation");
sslPort = config.getInitParameter("ssl-port");
toolbarMasterSwitch = config.getInitParameter("toolbar-master-switch");
reservedPrefix = yanelInstance.getReservedPrefix();
String expires = config.getInitParameter("static-content-cache-expires");
if (expires != null) {
this.cacheExpires = Integer.parseInt(expires);
}
yanelUI = new YanelHTMLUI(map, reservedPrefix);
// TODO: Make this value configurable also per realm or per individual user!
logAccessEnabled = new Boolean(config.getInitParameter("log-access")).booleanValue();
String TAG_SEP_PARAM_NAME = "access-log-tag-separator";
if (config.getInitParameter(TAG_SEP_PARAM_NAME) != null) {
if (config.getInitParameter(TAG_SEP_PARAM_NAME).equals("SPACE")) { // Note that the leading and trailing space around the parameter value is trimmed, hence we denote the space sign by SPACE.
ACCESS_LOG_TAG_SEPARATOR = " ";
} else {
ACCESS_LOG_TAG_SEPARATOR = config.getInitParameter(TAG_SEP_PARAM_NAME);
}
} else {
ACCESS_LOG_TAG_SEPARATOR = ",";
log.warn("No access log tag separator parameter '" + TAG_SEP_PARAM_NAME + "' configured, hence use default: " + ACCESS_LOG_TAG_SEPARATOR);
}
// TODO: Make this value configurable also per realm or per individual user!
if (config.getInitParameter("detect-mobile-per-request") != null) {
detectMobilePerRequest = new Boolean(config.getInitParameter("detect-mobile-per-request")).booleanValue();
}
if (config.getInitParameter("mobile-devices") != null) {
mobileDevices = org.springframework.util.StringUtils.tokenizeToStringArray(config.getInitParameter("mobile-devices"), ",", true, true);
} else {
mobileDevices = new String[]{"iPhone", "Android"};
log.error("No mobile devices configured! Please make sure to update your web.xml configuration file accordingly. Fallback to hard-coded list: " + mobileDevices);
}
if (yanelInstance.isSchedulerEnabled()) {
log.warn("Startup scheduler ...");
scheduler = StdSchedulerFactory.getDefaultScheduler();
Realm[] realms = yanelInstance.getRealmConfiguration().getRealms();
for (int i = 0; i < realms.length; i++) {
if (realms[i] instanceof org.wyona.yanel.core.map.RealmWithConfigurationExceptionImpl) {
String eMessage = ((org.wyona.yanel.core.map.RealmWithConfigurationExceptionImpl) realms[i]).getConfigurationException().getMessage();
log.error("Realm '" + realms[i].getID() + "' has thrown a configuration exception: " + eMessage);
} else {
String schedulerJobsPath = "/scheduler-jobs.xml";
if (realms[i].getRepository().existsNode(schedulerJobsPath)) {
log.debug("Scheduler jobs config found for realm: " + realms[i].getRepository().getID());
try {
org.wyona.yanel.impl.scheduler.QuartzSchedulerUtil.schedule(scheduler, XMLHelper.readDocument(realms[i].getRepository().getNode(schedulerJobsPath).getInputStream()), realms[i]);
} catch(Exception e) {
log.error(e, e); // INFO: Log error, but otherwise ignore and keep going ...
}
}
}
}
/* TODO: Make global scheduler jobs configurable
String groupName = "yanel";
JobDetail jobDetail = new JobDetail("heartbeatJob", groupName, org.wyona.yanel.servlet.HeartbeatJob.class);
Date startDate = new Date();
Date endDate = null;
Trigger trigger = new SimpleTrigger("heartbeatTrigger", groupName, startDate, endDate, SimpleTrigger.REPEAT_INDEFINITELY, 60L * 1000L);
scheduler.scheduleJob(jobDetail, trigger);
*/
scheduler.start();
}
} catch (Exception e) {
log.error(e.getMessage(), e);
throw new ServletException(e.getMessage(), e);
}
}
/**
* @see javax.servlet.http.HttpServlet#service(HttpServletRequest, HttpServletResponse)
*/
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// NOTE: Do not add code outside the try-catch block, because otherwise exceptions won't be logged
try {
//String httpAcceptMediaTypes = request.getHeader("Accept");
//String httpAcceptLanguage = request.getHeader("Accept-Language");
String yanelUsecase = request.getParameter(YANEL_USECASE);
if(yanelUsecase != null && yanelUsecase.equals("logout")) {
try {
log.warn("DEBUG: Disable auto login..."); // TODO: The cookie is not always deleted!
AutoLogin.disableAutoLogin(request, response, getRealm(request).getRepository());
} catch (Exception e) {
log.error("Exception while disabling auto login: " + e.getMessage(), e);
}
// INFO: Logout from Yanel
if(doLogout(request, response)) {
return;
} else {
log.error("Logout failed!");
}
} else if(yanelUsecase != null && yanelUsecase.equals("create")) { // TODO: Why does that not go through access control?
// INFO: Create a new resource
if(doCreate(request, response) != null) return;
}
// Check authorization and if authorization failed, then try to authenticate
if (doAccessControl(request, response) != null) {
// INFO: Either redirect (after successful authentication) or access denied (and response will send the login screen)
return;
} else {
if (log.isDebugEnabled()) log.debug("Access granted: " + request.getServletPath());
}
// Check for requests re policies
String policyRequestPara = request.getParameter(YANEL_ACCESS_POLICY_USECASE);
if (policyRequestPara != null) {
doAccessPolicyRequest(request, response, 1);
return;
} else if (yanelUsecase != null && yanelUsecase.equals("policy.read")) {
doAccessPolicyRequest(request, response, 2);
return;
}
// Check for requests for global data
Resource resource = getResource(request, response);
String path = resource.getPath();
if (path.indexOf("/" + reservedPrefix + "/") == 0) {
getGlobalData(request, response);
return;
}
String value = request.getParameter(YANEL_RESOURCE_USECASE);
// Delete node
if (value != null && value.equals("delete")) {
handleDeleteUsecase(request, response);
return;
}
// INFO: Check if user agent is mobile device
doMobile(request);
// Delegate ...
String method = request.getMethod();
if (method.equals(METHOD_PROPFIND)) {
doPropfind(request, response);
} else if (method.equals(METHOD_GET)) {
doGet(request, response);
} else if (method.equals(METHOD_POST)) {
doPost(request, response);
} else if (method.equals(METHOD_PUT)) {
doPut(request, response);
} else if (method.equals(METHOD_DELETE)) {
doDelete(request, response);
} else if (method.equals(METHOD_OPTIONS)) {
doOptions(request, response);
} else {
log.error("No such method implemented: " + method);
response.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED);
}
} catch (ServletException e) {
log.error(e, e);
throw new ServletException(e.getMessage(), e);
} catch (IOException e) {
log.error(e, e);
throw new IOException(e.getMessage());
} // NOTE: This was our last chance to log an exception, hence do not add code outside the try-catch block
}
/**
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest, HttpServletResponse)
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// INFO: Init session in case it does not exist yet
HttpSession session = request.getSession(true);
// INFO: Enable or disable toolbar
yanelUI.switchToolbar(request);
// INFO: Handle workflow transitions
String transition = request.getParameter(YANEL_RESOURCE_WORKFLOW_TRANSITION);
if (transition != null) {
executeWorkflowTransition(request,
response,
request.getParameter(YANEL_RESOURCE_REVISION),
transition);
return;
}
// INFO: Init resource
Resource resource = getResource(request, response);
// INFO: Check for requests refered by WebDAV
String yanelWebDAV = request.getParameter("yanel.webdav");
if(yanelWebDAV != null && yanelWebDAV.equals("propfind1")) {
log.info("WebDAV client (" + request.getHeader("User-Agent") + ") requests to \"edit\" a resource: " + resource.getRealm() + ", " + resource.getPath());
//return;
}
// INFO: Handle first specific Yanel usecase requests and then at the very end all other requests
String value = request.getParameter(YANEL_RESOURCE_USECASE);
try {
if (value != null && value.equals(RELEASE_LOCK)) {
log.warn("Try to release lock ...");
if (ResourceAttributeHelper.hasAttributeImplemented(resource, "Versionable", "2")) {
VersionableV2 versionable = (VersionableV2)resource;
String checkoutUserID = versionable.getCheckoutUserID();
Identity identity = getEnvironment(request, response).getIdentity();
String userID = identity.getUsername();
Usecase usecase = new Usecase(RELEASE_LOCK);
String path = resource.getPath();
if (checkoutUserID.equals(userID) || resource.getRealm().getPolicyManager().authorize(path, identity, usecase)) {
try {
versionable.cancelCheckout();
log.debug("Lock has been released.");
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType("text/html" + "; charset=" + "UTF-8");
String backToRealm = org.wyona.yanel.core.util.PathUtil.backToRealm(resource.getPath());
StringBuilder sb = new StringBuilder("<html xmlns=\"http://www.w3.org/1999/xhtml\"><body>Lock has been released! back to <a href=\""+backToRealm + resource.getPath() +"\">page</a>.</body></html>");
PrintWriter w = response.getWriter();
w.print(sb);
return;
} catch (Exception e) {
throw new ServletException("Releasing the lock of <" + resource.getPath() + "> failed because of: " + e.getMessage(), e);
}
} else {
String eMessage = "Releasing the lock of '" + resource.getPath() + "' failed because";
if (checkoutUserID.equals(userID)) {
eMessage = " user '" + userID + "' has no right to release her/his own lock!";
} else {
eMessage = " checkout user '" + checkoutUserID + "' and session user '" + userID + "' are not the same and session user '" + userID + "' has no right to release the lock of the checkout user '" + checkoutUserID + "'!";
}
log.warn(eMessage);
throw new ServletException(eMessage);
}
} else {
throw new ServletException("Resource '" + resource.getPath() + "' is not VersionableV2!");
}
} else if (value != null && value.equals("roll-back")) {
log.debug("Roll back ...");
org.wyona.yanel.core.util.VersioningUtil.rollBack(resource, request.getParameter(YANEL_RESOURCE_REVISION), getIdentity(request, map).getUsername());
// TODO: Send confirmation screen
getContent(request, response);
return;
} else {
//log.debug("Handle all other GET requests...");
getContent(request, response);
return;
}
} catch (Exception e) {
throw new ServletException(e.getMessage(), e);
}
}
/**
* Returns the mime-type according to the given file extension.
* Default is application/octet-stream.
* @param extension
* @return
*/
private static String guessMimeType(String extension) {
String ext = extension.toLowerCase();
if (ext.equals("html") || ext.equals("htm")) return "text/html";
if (ext.equals("css")) return "text/css";
if (ext.equals("txt")) return "text/plain";
if (ext.equals("js")) return "application/x-javascript";
if (ext.equals("jpg") || ext.equals("jpg")) return "image/jpeg";
if (ext.equals("gif")) return "image/gif";
if (ext.equals("pdf")) return "application/pdf";
if (ext.equals("zip")) return "application/zip";
if (ext.equals("htc")) return "text/x-component";
if (ext.equals("svg")) return "image/svg+xml";
// TODO: add more mime types
// TODO: and move to MimeTypeUtil
return "application/octet-stream"; // default
}
/**
* Generate response from view of resource
*/
private void getContent(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
View view = null;
org.w3c.dom.Document doc = null;
try {
doc = getDocument(NAMESPACE, "yanel");
} catch (Exception e) {
throw new ServletException(e.getMessage(), e);
}
Element rootElement = doc.getDocumentElement();
rootElement.setAttribute("servlet-context-real-path", servletContextRealPath);
Element requestElement = (Element) rootElement.appendChild(doc.createElementNS(NAMESPACE, "request"));
requestElement.setAttributeNS(NAMESPACE, "uri", request.getRequestURI());
requestElement.setAttributeNS(NAMESPACE, "servlet-path", request.getServletPath());
HttpSession session = request.getSession(true);
Element sessionElement = (Element) rootElement.appendChild(doc.createElement("session"));
sessionElement.setAttribute("id", session.getId());
Enumeration<?> attrNames = session.getAttributeNames();
if (!attrNames.hasMoreElements()) {
Element sessionNoAttributesElement = (Element) sessionElement.appendChild(doc.createElement("no-attributes"));
}
while (attrNames.hasMoreElements()) {
String name = (String)attrNames.nextElement();
String value = session.getAttribute(name).toString();
Element sessionAttributeElement = (Element) sessionElement.appendChild(doc.createElement("attribute"));
sessionAttributeElement.setAttribute("name", name);
sessionAttributeElement.appendChild(doc.createTextNode(value));
}
String usecase = request.getParameter(YANEL_RESOURCE_USECASE);
Resource res = null;
TrackingInformationV1 trackInfo = null;
long lastModified = -1;
long size = -1;
// START first try
try {
Environment environment = getEnvironment(request, response);
res = getResource(request, response);
if (res != null) {
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Trackable", "1")) {
//log.debug("Do track: " + res.getPath());
trackInfo = new TrackingInformationV1();
((org.wyona.yanel.core.api.attributes.TrackableV1) res).doTrack(trackInfo);
//} else {
// log.debug("Resource '" + res.getPath() + "' is not trackable.");
}
// START introspection generation
if (usecase != null && usecase.equals("introspection")) {
sendIntrospectionAsResponse(res, doc, rootElement, request, response);
return;
}
// END introspection generation
Element resourceElement = getResourceMetaData(res, doc, rootElement);
Element viewElement = (Element) resourceElement.appendChild(doc.createElement("view"));
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Viewable", "1")) {
if (log.isDebugEnabled()) log.debug("Resource is viewable V1");
viewElement.setAttributeNS(NAMESPACE, "version", "1");
appendViewDescriptors(doc, viewElement, ((ViewableV1) res).getViewDescriptors());
String viewId = getViewID(request);
try {
view = ((ViewableV1) res).getView(request, viewId);
} catch (org.wyona.yarep.core.NoSuchNodeException e) {
String message = e.getMessage();
log.error(message, e);
do404(request, response, doc, message);
return;
} catch (Exception e) {
String message = e.getMessage();
log.error(message, e);
Element exceptionElement = (Element) rootElement.appendChild(doc.createElementNS(NAMESPACE, "exception"));
exceptionElement.appendChild(doc.createTextNode(message));
exceptionElement.setAttributeNS(NAMESPACE, "status", "500");
response.setStatus(javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
setYanelOutput(request, response, doc);
return;
}
} else if (ResourceAttributeHelper.hasAttributeImplemented(res, "Viewable", "2")) {
if (log.isDebugEnabled()) log.debug("Resource '" + res.getPath() + "' is viewable V2");
viewElement.setAttributeNS(NAMESPACE, "version", "2");
appendViewDescriptors(doc, viewElement, ((ViewableV2) res).getViewDescriptors());
if (!((ViewableV2) res).exists()) {
log.warn("No such ViewableV2 resource: " + res.getPath());
log.warn("TODO: Many ViewableV2 resources are not implementing exists() properly, hence do not generate a 404 for backwards compatibility! As a workaround use the exists() method within the getView(String) method and throw a ResourceNotFoundException accordingly.");
//do404(request, response, doc, res.getPath());
//return;
}
try {
size = ((ViewableV2) res).getSize();
Element sizeElement = (Element) resourceElement.appendChild(doc.createElement("size"));
sizeElement.appendChild(doc.createTextNode(String.valueOf(size)));
} catch(ResourceNotFoundException e) {
log.error(e, e); // INFO: Let's be fault tolerant such that a 404 can be handled more gracefully further down
}
String viewId = getViewID(request);
try {
String revisionName = request.getParameter(YANEL_RESOURCE_REVISION);
// NOTE: Check also if usecase is not roll-back, because roll-back is also using the yanel.resource.revision
if (revisionName != null && ResourceAttributeHelper.hasAttributeImplemented(res, "Versionable", "2") && !isRollBack(request)) {
view = ((VersionableV2) res).getView(viewId, revisionName);
} else if (environment.getStateOfView().equals(StateOfView.LIVE) && ResourceAttributeHelper.hasAttributeImplemented(res, "Workflowable", "1") && WorkflowHelper.getWorkflow(res) != null) { // TODO: Instead using the WorkflowHelper the Workflowable interface should have a method to check if the resource actually has a workflow assigned, see http://lists.wyona.org/pipermail/yanel-development/2009-June/003709.html
// TODO: Check if resource actually exists (see the exist problem above), because even it doesn't exist, the workflowable interfaces can return something although it doesn't really make sense. For example if a resource type is workflowable, but it has no workflow associated with it, then WorkflowHelper.isLive will nevertheless return true, whereas WorkflowHelper.getLiveView will throw an exception!
if (!((ViewableV2) res).exists()) {
log.warn("No such ViewableV2 resource: " + res.getPath());
log.warn("TODO: It seems like many ViewableV2 resources are not implementing exists() properly!");
do404(request, response, doc, res.getPath());
return;
}
WorkflowableV1 workflowable = (WorkflowableV1)res;
if (workflowable.isLive()) {
view = workflowable.getLiveView(viewId);
} else {
String message = "The viewable (V2) resource '" + res.getPath() + "' is WorkflowableV1, but has not been published yet.";
log.warn(message);
// TODO: Make this configurable per resource (or rather workflowable interface) or per realm?!
if (displayMostRecentVersion) {
// INFO: Because of backwards compatibility the default should display the most recent version
log.warn("Instead the live version, the most recent version will be displayed!");
view = ((ViewableV2) res).getView(viewId);
} else {
log.warn("Instead the live version, a 404 will be displayed!");
// TODO: Instead a 404 one might want to show a different kind of screen
do404(request, response, doc, message);
return;
}
}
} else {
view = ((ViewableV2) res).getView(viewId);
}
} catch (org.wyona.yarep.core.NoSuchNodeException e) {
String message = e.getMessage();
log.warn(message, e);
do404(request, response, doc, message);
return;
} catch (ResourceNotFoundException e) {
String message = e.getMessage();
log.warn(message, e);
do404(request, response, doc, message);
return;
}
} else { // NO Viewable interface implemented!
String message = res.getClass().getName() + " is not viewable! (" + res.getPath() + ", " + res.getRealm() + ")";
log.error(message);
Element noViewElement = (Element) resourceElement.appendChild(doc.createElement("not-viewable"));
noViewElement.appendChild(doc.createTextNode(res.getClass().getName() + " is not viewable!"));
Element exceptionElement = (Element) rootElement.appendChild(doc.createElementNS(NAMESPACE, "exception"));
exceptionElement.appendChild(doc.createTextNode(message));
exceptionElement.setAttributeNS(NAMESPACE, "status", "501");
response.setStatus(javax.servlet.http.HttpServletResponse.SC_NOT_IMPLEMENTED);
setYanelOutput(request, response, doc);
return;
}
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Modifiable", "2")) {
lastModified = ((ModifiableV2) res).getLastModified();
Element lastModifiedElement = (Element) resourceElement.appendChild(doc.createElement("last-modified"));
lastModifiedElement.appendChild(doc.createTextNode(new Date(lastModified).toString()));
} else {
Element noLastModifiedElement = (Element) resourceElement.appendChild(doc.createElement("no-last-modified"));
}
// Get the revisions, but only in the meta usecase (because of performance reasons)
if (request.getParameter(RESOURCE_META_ID_PARAM_NAME) != null) {
appendRevisionsAndWorkflow(doc, resourceElement, res, request);
}
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Translatable", "1")) {
TranslatableV1 translatable = ((TranslatableV1) res);
Element translationsElement = (Element) resourceElement.appendChild(doc.createElement("translations"));
String[] languages = translatable.getLanguages();
for (int i=0; i<languages.length; i++) {
Element translationElement = (Element) translationsElement.appendChild(doc.createElement("translation"));
translationElement.setAttribute("language", languages[i]);
String path = translatable.getTranslation(languages[i]).getPath();
translationElement.setAttribute("path", path);
}
}
if (usecase != null && usecase.equals("checkout")) {
if(log.isDebugEnabled()) log.debug("Checkout data ...");
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Versionable", "2")) {
// NOTE: The code below will throw an exception if the document is checked out already by another user.
String userID = environment.getIdentity().getUsername();
VersionableV2 versionable = (VersionableV2)res;
if (versionable.isCheckedOut()) {
String checkoutUserID = versionable.getCheckoutUserID();
if (checkoutUserID.equals(userID)) {
log.warn("Resource " + res.getPath() + " is already checked out by this user: " + checkoutUserID);
} else {
if (isClientSupportingNeutron(request)) {
String eMessage = "Resource '" + res.getPath() + "' is already checked out by another user: " + checkoutUserID;
response.setContentType("application/xml");
response.setStatus(javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
// TODO: Checkout date and break-lock (optional)
response.getWriter().print(XMLExceptionV1.getCheckoutException(eMessage, res.getPath(), checkoutUserID, null));
return;
} else {
throw new Exception("Resource '" + res.getPath() + "' is already checked out by another user: " + checkoutUserID);
}
}
} else {
versionable.checkout(userID);
}
} else {
log.warn("Acquire lock has not been implemented yet ...!");
// acquireLock();
}
}
} else {
Element resourceIsNullElement = (Element) rootElement.appendChild(doc.createElement("resource-is-null"));
}
} catch (org.wyona.yarep.core.NoSuchNodeException e) {
String message = e.getMessage();
log.warn(message, e);
do404(request, response, doc, message);
return;
} catch (org.wyona.yanel.core.ResourceNotFoundException e) {
String message = e.getMessage();
log.warn(message, e);
do404(request, response, doc, message);
return;
} catch (Exception e) {
log.error(e, e);
handleException(request, response, e);
return;
}
// END first try
String meta = request.getParameter(RESOURCE_META_ID_PARAM_NAME);
if (meta != null) {
if (meta.length() > 0) {
if (meta.equals("annotations")) {
log.debug("Remove everything from the page meta document except the annotations");
cleanMetaDoc(doc);
appendAnnotations(doc, res);
appendTrackingInformation(doc, trackInfo);
} else {
log.warn("TODO: Stripping everything from page meta document but, '" + meta + "' not supported!");
}
} else {
log.debug("Show all meta");
appendAnnotations(doc, res);
appendTrackingInformation(doc, trackInfo);
}
response.setStatus(javax.servlet.http.HttpServletResponse.SC_OK);
setYanelOutput(request, response, doc);
return;
}
if (view != null) {
if (generateResponse(view, res, request, response, -1, doc, size, lastModified, trackInfo) != null) {
//log.debug("Response has been generated :-)");
return;
} else {
log.warn("No response has been generated!");
}
} else {
String message = "View is null!";
Element exceptionElement = (Element) rootElement.appendChild(doc.createElementNS(NAMESPACE, "exception"));
exceptionElement.appendChild(doc.createTextNode(message));
}
response.setStatus(javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
setYanelOutput(request, response, doc);
return;
}
/**
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest, HttpServletResponse)
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String transition = request.getParameter(YANEL_RESOURCE_WORKFLOW_TRANSITION);
if (transition != null) {
executeWorkflowTransition(request,
response,
request.getParameter(YANEL_RESOURCE_REVISION),
transition);
return;
}
String value = request.getParameter(YANEL_RESOURCE_USECASE);
if (value != null && value.equals("save")) {
log.debug("Save data ...");
save(request, response, false);
return;
} else if (value != null && value.equals("checkin")) {
log.debug("Checkin data ...");
save(request, response, true);
log.warn("Release lock has not been implemented yet ...");
// releaseLock();
return;
} else {
log.info("No parameter " + YANEL_RESOURCE_USECASE + "!");
String contentType = request.getContentType();
// TODO: Check for type (see section 9.2 of APP spec (e.g. draft 16)
if (contentType != null && contentType.indexOf("application/atom+xml") >= 0) {
InputStream in = intercept(request.getInputStream());
// Create new Atom entry
try {
String atomEntryUniversalName = "<{http://www.wyona.org/yanel/resource/1.0}atom-entry/>";
Realm realm = yanelInstance.getMap().getRealm(request.getServletPath());
String newEntryPath = yanelInstance.getMap().getPath(realm, request.getServletPath() + "/" + new Date().getTime() + ".xml");
log.debug("Realm and Path of new Atom entry: " + realm + " " + newEntryPath);
Resource atomEntryResource = yanelInstance.getResourceManager().getResource(getEnvironment(request, response), realm, newEntryPath, new ResourceTypeRegistry().getResourceTypeDefinition(atomEntryUniversalName), new ResourceTypeIdentifier(atomEntryUniversalName, null));
((ModifiableV2)atomEntryResource).write(in);
byte buffer[] = new byte[8192];
int bytesRead;
InputStream resourceIn = ((ModifiableV2)atomEntryResource).getInputStream();
OutputStream responseOut = response.getOutputStream();
while ((bytesRead = resourceIn.read(buffer)) != -1) {
responseOut.write(buffer, 0, bytesRead);
}
resourceIn.close();
//responseOut.close();
// TODO: Fix Location ...
response.setHeader("Location", "http://ulysses.wyona.org" + newEntryPath);
response.setStatus(javax.servlet.http.HttpServletResponse.SC_CREATED);
return;
} catch (Exception e) {
throw new ServletException(e.getMessage(), e);
}
}
// Enable or disable toolbar
yanelUI.switchToolbar(request);
getContent(request, response);
}
}
/**
* Perform the given transition on the indicated revision.
* @param request
* @param response
* @param transition
* @throws ServletException
* @throws IOException
*/
private void executeWorkflowTransition(HttpServletRequest request,
HttpServletResponse response,
String revision,
String transition)
throws ServletException, IOException {
Resource resource = getResource(request, response);
if (ResourceAttributeHelper.hasAttributeImplemented(resource, "Workflowable", "1")) {
WorkflowableV1 workflowable = (WorkflowableV1)resource;
try {
String outputFormat = request.getParameter(YANEL_RESOURCE_WORKFLOW_TRANSITION_OUTPUT);
StringBuilder sb = null;
workflowable.doTransition(transition, revision);
response.setStatus(javax.servlet.http.HttpServletResponse.SC_OK);
if (outputFormat != null && CONTENT_TYPE_XHTML.equals(outputFormat.toLowerCase())) {
response.setContentType("text/html; charset=" + DEFAULT_ENCODING);
sb = new StringBuilder("<html xmlns=\"http://www.w3.org/1999/xhtml\"><body><p>The action " + transition
+ " has been performed.</p><p>Return to <a href=\""
+ request.getHeader(HTTP_REFERRER)
+ "\">the page</a>.</p></body></html>");
} else {
log.warn("No output format query string parameter '" + YANEL_RESOURCE_WORKFLOW_TRANSITION_OUTPUT + "' has been specified.");
response.setContentType("application/xml; charset=" + DEFAULT_ENCODING);
sb = new StringBuilder("<?xml version=\"1.0\"?>");
sb.append(workflowable.getWorkflowIntrospection());
}
PrintWriter w = response.getWriter();
w.print(sb);
} catch (WorkflowException e) {
log.error(e, e);
response.setContentType("application/xml; charset=" + DEFAULT_ENCODING);
response.setStatus(javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
PrintWriter w = response.getWriter();
w.print(getWorkflowException(e.getMessage()));
return;
}
} else {
log.warn("Resource not workflowable: " + resource.getPath());
}
}
/**
* HTTP PUT implementation.
*/
@Override
protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO: Reuse code doPost resp. share code with doPut
String value = request.getParameter(YANEL_RESOURCE_USECASE);
if (value != null && value.equals("save")) {
log.debug("Save data ...");
save(request, response, false);
return;
} else if (value != null && value.equals("checkin")) {
log.debug("Checkin data ...");
save(request, response, true);
log.warn("Release lock has not been implemented yet ...!");
// releaseLock();
return;
} else {
log.warn("No parameter " + YANEL_RESOURCE_USECASE + "!");
String contentType = request.getContentType();
if (contentType != null && contentType.indexOf("application/atom+xml") >= 0) {
InputStream in = intercept(request.getInputStream());
// Overwrite existing atom entry
try {
String atomEntryUniversalName = "<{http://www.wyona.org/yanel/resource/1.0}atom-entry/>";
Realm realm = yanelInstance.getMap().getRealm(request.getServletPath());
String entryPath = yanelInstance.getMap().getPath(realm, request.getServletPath());
log.debug("Realm and Path of new Atom entry: " + realm + " " + entryPath);
Resource atomEntryResource = yanelInstance.getResourceManager().getResource(getEnvironment(request, response), realm, entryPath, new ResourceTypeRegistry().getResourceTypeDefinition(atomEntryUniversalName), new ResourceTypeIdentifier(atomEntryUniversalName, null));
// TODO: There seems to be a problem ...
((ModifiableV2)atomEntryResource).write(in);
// NOTE: This method does not update updated date
/*
OutputStream out = ((ModifiableV2)atomEntry).getOutputStream(entryPath);
byte buffer[] = new byte[8192];
int bytesRead;
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}
*/
log.info("Atom entry has been saved: " + entryPath);
response.setStatus(javax.servlet.http.HttpServletResponse.SC_OK);
return;
} catch (Exception e) {
throw new ServletException(e.getMessage(), e);
}
} else {
Resource resource = getResource(request, response);
log.warn("Client (" + request.getHeader("User-Agent") + ") requests to save a resource: " + resource.getRealm() + ", " + resource.getPath());
save(request, response, false);
return;
}
}
}
/**
* @see javax.servlet.http.HttpServlet#doDelete(HttpServletRequest, HttpServletResponse);
*/
@Override
protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Resource res = getResource(request, response);
if (ResourceAttributeHelper.hasAttributeImplemented(res, "Modifiable", "2")) {
if (((ModifiableV2) res).delete()) {
// TODO: Also delete resource config! What about access policies?!
log.debug("Resource has been deleted: " + res);
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType("text/html" + "; charset=" + "UTF-8");
String backToRealm = org.wyona.yanel.core.util.PathUtil.backToRealm(res.getPath());
StringBuilder sb = new StringBuilder("<html xmlns=\"http://www.w3.org/1999/xhtml\"><body>Page has been deleted! <a href=\"" + backToRealm + res.getPath().substring(1) +"\">Check</a> or return to <a href=\"" + backToRealm + "\">Homepage</a>.</body></html>");
PrintWriter w = response.getWriter();
w.print(sb);
return;
} else {
log.warn("Deletable (or rather ModifiableV2) resource '" + res + "' could not be deleted!");
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
} else {
log.error("Resource '" + res + "' has interface ModifiableV2 not implemented." );
response.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED);
return; // QUESTION: According to the spec http://docs.oracle.com/javaee/1.4/api/javax/servlet/http/HttpServlet.html#doDelete%28javax.servlet.http.HttpServletRequest,%20javax.servlet.http.HttpServletResponse%29 one should rather throw a ServletException, right?
}
} catch (Exception e) {
throw new ServletException("Could not delete resource with URL <" + request.getRequestURL() + ">: " + e.getMessage(), e);
}
}
/**
* Resolve resource for a specific request
*/
private Resource getResource(HttpServletRequest request, HttpServletResponse response) throws ServletException {
try {