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WebDAV server implementations for JCR
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.jackrabbit.server.remoting.davex;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavLocatorFactory;
import org.apache.jackrabbit.webdav.DavMethods;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceLocator;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.DavSession;
import org.apache.jackrabbit.webdav.WebdavRequest;
import org.apache.jackrabbit.webdav.WebdavResponse;
import org.apache.jackrabbit.webdav.DavResourceFactory;
import org.apache.jackrabbit.webdav.observation.SubscriptionManager;
import org.apache.jackrabbit.webdav.version.DeltaVConstants;
import org.apache.jackrabbit.webdav.jcr.JcrDavException;
import org.apache.jackrabbit.webdav.jcr.JcrDavSession;
import org.apache.jackrabbit.webdav.jcr.JCRWebdavServerServlet;
import org.apache.jackrabbit.webdav.jcr.transaction.TxLockManagerImpl;
import org.apache.jackrabbit.util.Text;
import org.apache.jackrabbit.JcrConstants;
import org.apache.jackrabbit.server.util.RequestData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.Item;
import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.Workspace;
import javax.jcr.ItemNotFoundException;
import javax.jcr.NodeIterator;
import javax.jcr.PathNotFoundException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
/**
* JcrRemotingServlet is an extended version of the
* {@link org.apache.jackrabbit.webdav.jcr.JCRWebdavServerServlet JCR Remoting Servlet}
* that provides improved
*
* - Batch read
* - Batch write
*
* functionality and supports cross workspace copy and cloning.
*
*
* Batch Read
*
* Upon RepositoryService.getItemInfos a JSON object is composed containing
* the information for the requested node and its child items up to a
* specified or configuration determined depth.
*
* Batch read is triggered by adding a '.json' extension to the resource href.
* Optionally the client may explicitely specify the desired batch read depth
* by appending '.depth.json' extension. If no json extension is present the
* GET request is processed by the base servlet.
*
* The JSON writer applies the following rules:
*
*
* - Nodes are represented as JSON objects.
*
* - Each Node has its properties included as JSON key/value pairs.
*
* - Single valued Properties are simple key/value pairs.
*
* - Multi valued Properties are represented as JSON array.
*
* - Each Node has its child nodes included as long a maximal depths is not reached.
*
* - Nodes without any child nodes get a special JSON member named
* ::NodeIteratorSize, whose value is zero.
*
* - If the maximal depth is reached only name, index and unique id of the
* direct child are included (incomplete node info). In order to obtain
* the complete information the client sends another GET with .json extension.
*
*
* Same name sibling nodes and properties whose type cannot be unambiguously be
* extracted from the JSON on the client side need some special handling:
*
*
* - Node with index > 1, get a JSON key consisting of
* Node.getName() + "[" + Node.getIndex() + "]"
*
* - Binary Property
* JSON value = length of the JCR value.
* The JCR value must be retrieved separately.
*
* - Name, Path, Reference and Date Property
* The JSON member representing the Property (name, value) is preceeded by a
* special member consisting of
* JSON key = ":" + Property.getName()
* JSON value = PropertyType.nameFromValue(Property.getType())
*
* - Multi valued properties with Property.getValues().length == 0 will be
* treated as special property types above (extra property indicating the
* type of the property).
*
* - Double Property
* JSON value must not have any trailing ".0" removed.
*
*
* Batch Write
*
* The complete SPI Batch is sent to the server in a single request, currently a
* POST request containing a custom ":diff" parameter.
*
* NOTE that this is targeted to be replaced by a PATCH request.
*
* Diff format
*
* The diff parameter currently consists of JSON-like key-value pairs with the
* following special requirements:
*
*
* diff ::= members
* members ::= pair | pairs
* pair ::= key " : " value
* pairs ::= pair line-end pair | pair line-end pairs
* line-end ::= "\r\n" | "\n" | "\r"
* key ::= diffchar path
* diffchar ::= "+" | "^" | "-" | ">"
* path ::= abspath | relpath
* abspath ::= * absolute path to an item *
* relpath ::= * relpath from item at request URI to an item *
* value ::= value+ | value- | value^ | value>
* value+ ::= * a JSON object *
* value- ::= ""
* value^ ::= * any JSON value except JSON object *
* value> ::= path | path "#before" | path "#after" | "#first" | "#last"
*
*
* In other words:
*
* - diff consists of one or more key-value pair(s)
* - key must start with a diffchar followed by a rel. or abs. item path
* - diffchar being any of "+", "^", "-" or ">" representing the transient
* item modifications as follows
*
* "+" addNode
* "^" setProperty / setValue / removeProperty
* "-" remove Item
* ">" move / reorder Nodes
*
*
* - key must be separated from the value by a ":" surrounded by whitespace.
* - two pairs must be separated by a line end
* - the format of the value depends on the diffchar
* - for moving around node the value must consist of a abs. or rel. path.
* in contrast reordering of existing nodes is achieved by appending a trailing
* order position hint (#first, #last, #before or #after)
*
*
* NOTE the following special handling of JCR properties of type
* Binary, Name, Path, Date and Reference:
*
* - the JSON value must be missing
* - the POST request is expected to contain extra multipart(s) or request
* parameter(s) for the property value(s)
* - the content type of the extra parts/params must reflect the property
* type:"jcr-value/" + PropertyType.nameFromValue(Property.getType).toLowerCase()
*
*
* @see www.json.org for the definition of
* JSON object and JSON value.
*/
public abstract class JcrRemotingServlet extends JCRWebdavServerServlet {
private static Logger log = LoggerFactory.getLogger(JcrRemotingServlet.class);
/**
* the home init parameter. other relative filesystem paths are
* relative to this location.
*/
public static final String INIT_PARAM_HOME = "home";
/**
* the 'temp-directory' init parameter
*/
public static final String INIT_PARAM_TMP_DIRECTORY = "temp-directory";
/**
* temp-dir attribute to be set to the servlet-context
*/
public static final String ATTR_TMP_DIRECTORY = "remoting-servlet.tmpdir";
/**
* the 'temp-directory' init parameter
*/
public static final String INIT_PARAM_BATCHREAD_CONFIG = "batchread-config";
private static final String PARAM_DIFF = ":diff";
private static final String PARAM_COPY = ":copy";
private static final String PARAM_CLONE = ":clone";
private BatchReadConfig brConfig;
@Override
public void init() throws ServletException {
super.init();
brConfig = new BatchReadConfig();
String brConfigParam = getServletConfig().getInitParameter(INIT_PARAM_BATCHREAD_CONFIG);
if (brConfigParam == null) {
// TODO: define default values.
log.debug("batchread-config missing -> initialize defaults.");
brConfig.setDepth("nt:file", BatchReadConfig.DEPTH_INFINITE);
brConfig.setDefaultDepth(5);
} else {
try {
InputStream in = getServletContext().getResourceAsStream(brConfigParam);
if (in != null) {
brConfig.load(in);
}
} catch (IOException e) {
log.debug("Unable to build BatchReadConfig from " + brConfigParam + ".");
}
}
// setup home directory
String paramHome = getServletConfig().getInitParameter(INIT_PARAM_HOME);
if (paramHome == null) {
log.debug("missing init-param " + INIT_PARAM_HOME + ". using default: 'jackrabbit'");
paramHome = "jackrabbit";
}
File home;
try {
home = new File(paramHome).getCanonicalFile();
} catch (IOException e) {
throw new ServletException(INIT_PARAM_HOME + " invalid." + e.toString());
}
home.mkdirs();
String tmp = getServletConfig().getInitParameter(INIT_PARAM_TMP_DIRECTORY);
if (tmp == null) {
log.debug("No " + INIT_PARAM_TMP_DIRECTORY + " specified. using 'tmp'");
tmp = "tmp";
}
File tmpDirectory = new File(home, tmp);
tmpDirectory.mkdirs();
log.debug(" temp-directory = " + tmpDirectory.getPath());
getServletContext().setAttribute(ATTR_TMP_DIRECTORY, tmpDirectory);
// force usage of custom locator factory.
super.setLocatorFactory(new DavLocatorFactoryImpl(getInitParameter(INIT_PARAM_RESOURCE_PATH_PREFIX)));
}
@Override
public DavResourceFactory getResourceFactory() {
return new ResourceFactoryImpl(txMgr, subscriptionMgr);
}
@Override
protected void doGet(WebdavRequest webdavRequest,
WebdavResponse webdavResponse,
DavResource davResource) throws IOException, DavException {
if (canHandle(DavMethods.DAV_GET, webdavRequest, davResource)) {
// return json representation of the requested resource
try {
Item item = ((JcrDavSession) webdavRequest.getDavSession()).getRepositorySession().getItem(davResource.getLocator().getRepositoryPath());
if (item.isNode()) {
webdavResponse.setContentType("text/plain;charset=utf-8");
webdavResponse.setStatus(DavServletResponse.SC_OK);
JsonWriter writer = new JsonWriter(webdavResponse.getWriter());
int depth = ((WrappingLocator) davResource.getLocator()).getDepth();
if (depth < BatchReadConfig.DEPTH_INFINITE) {
depth = getDepth((Node) item);
}
writer.write((Node) item, depth);
} else {
// properties cannot be requested as json object.
throw new JcrDavException(new ItemNotFoundException("No node at " + item.getPath()), DavServletResponse.SC_NOT_FOUND);
}
} catch (RepositoryException e) {
// should only get here if the item does not exist.
log.debug(e.getMessage());
throw new JcrDavException(e);
}
} else {
super.doGet(webdavRequest, webdavResponse, davResource);
}
}
@Override
protected void doPost(WebdavRequest webdavRequest, WebdavResponse webdavResponse, DavResource davResource)
throws IOException, DavException {
if (canHandle(DavMethods.DAV_POST, webdavRequest, davResource)) {
// special remoting request: the defined parameters are exclusive
// and cannot be combined.
Session session = getRepositorySession(webdavRequest);
RequestData data = new RequestData(webdavRequest, getTempDirectory(getServletContext()));
String loc = null;
try {
String[] pValues;
if ((pValues = data.getParameterValues(PARAM_CLONE)) != null) {
loc = clone(session, pValues, davResource.getLocator());
} else if ((pValues = data.getParameterValues(PARAM_COPY)) != null) {
loc = copy(session, pValues, davResource.getLocator());
} else if (data.getParameterValues(PARAM_DIFF) != null) {
String targetPath = davResource.getLocator().getRepositoryPath();
processDiff(session, targetPath, data);
} else {
String targetPath = davResource.getLocator().getRepositoryPath();
loc = modifyContent(session, targetPath, data);
}
// TODO: append entity
if (loc == null) {
webdavResponse.setStatus(HttpServletResponse.SC_OK);
} else {
webdavResponse.setHeader(DeltaVConstants.HEADER_LOCATION, loc);
webdavResponse.setStatus(HttpServletResponse.SC_CREATED);
}
} catch (RepositoryException e) {
log.warn(e.getMessage());
throw new JcrDavException(e);
} catch (DiffException e) {
log.warn(e.getMessage());
Throwable cause = e.getCause();
if (cause instanceof RepositoryException) {
throw new JcrDavException((RepositoryException) cause);
} else {
throw new DavException(DavServletResponse.SC_BAD_REQUEST, "Invalid diff format.");
}
} finally {
data.dispose();
}
} else {
super.doPost(webdavRequest, webdavResponse, davResource);
}
}
private boolean canHandle(int methodCode, WebdavRequest request, DavResource davResource) {
DavResourceLocator locator = davResource.getLocator();
switch (methodCode) {
case DavMethods.DAV_GET:
return davResource.exists() && (locator instanceof WrappingLocator)
&& ((WrappingLocator) locator).isJsonRequest;
case DavMethods.DAV_POST:
String ct = request.getContentType();
return ct.startsWith("multipart/form-data") ||
ct.startsWith("application/x-www-form-urlencoded");
default:
return false;
}
}
private int getDepth(Node node) throws RepositoryException {
return brConfig.getDepth(node.getPrimaryNodeType().getName());
}
private static String clone(Session session, String[] cloneArgs, DavResourceLocator reqLocator) throws RepositoryException {
Workspace wsp = session.getWorkspace();
String destPath = null;
for (String cloneArg : cloneArgs) {
String[] args = cloneArg.split(",");
if (args.length == 4) {
wsp.clone(args[0], args[1], args[2], Boolean.valueOf(args[3]));
destPath = args[2];
} else {
throw new RepositoryException(":clone parameter must have a value consisting of the 4 args needed for a Workspace.clone() call.");
}
}
return buildLocationHref(session, destPath, reqLocator);
}
private static String copy(Session session, String[] copyArgs, DavResourceLocator reqLocator) throws RepositoryException {
Workspace wsp = session.getWorkspace();
String destPath = null;
for (String copyArg : copyArgs) {
String[] args = copyArg.split(",");
switch (args.length) {
case 2:
wsp.copy(args[0], args[1]);
destPath = args[1];
break;
case 3:
wsp.copy(args[0], args[1], args[2]);
destPath = args[2];
break;
default:
throw new RepositoryException(":copy parameter must have a value consisting of 2 jcr paths or workspaceName plus 2 jcr paths separated by ','.");
}
}
return buildLocationHref(session, destPath, reqLocator);
}
private static String buildLocationHref(Session s, String destPath, DavResourceLocator reqLocator) throws RepositoryException {
if (destPath != null) {
NodeIterator it = s.getRootNode().getNodes(destPath.substring(1));
Node n = null;
while (it.hasNext()) {
n = it.nextNode();
}
if (n != null) {
DavResourceLocator loc = reqLocator.getFactory().createResourceLocator(reqLocator.getPrefix(), reqLocator.getWorkspacePath(), n.getPath(), false);
return loc.getHref(true);
}
}
// unable to determine -> no location header sent back.
return null;
}
private static void processDiff(Session session, String targetPath, RequestData data)
throws RepositoryException, DiffException, IOException {
String[] diffs = data.getParameterValues(PARAM_DIFF);
DiffHandler handler = new JsonDiffHandler(session, targetPath, data);
DiffParser parser = new DiffParser(handler);
for (String diff : diffs) {
boolean success = false;
try {
parser.parse(diff);
session.save();
success = true;
} finally {
if (!success) {
session.refresh(false);
}
}
}
}
/**
* TODO: doesn't work properly with intermedite SNS-nodes
* TODO: doesn't respect jcr:uuid properties.
*
* @param session
* @param targetPath
* @param data
* @throws RepositoryException
* @throws DiffException
*/
private static String modifyContent(Session session, String targetPath, RequestData data)
throws RepositoryException, DiffException {
JsonDiffHandler dh = new JsonDiffHandler(session, targetPath, data);
boolean success = false;
try {
for (Iterator pNames = data.getParameterNames(); pNames.hasNext();) {
String paramName = pNames.next();
String propPath = dh.getItemPath(paramName);
String parentPath = Text.getRelativeParent(propPath, 1);
if (!session.itemExists(parentPath) || !session.getItem(parentPath).isNode()) {
createNode(session, parentPath, data);
}
if (JcrConstants.JCR_PRIMARYTYPE.equals(Text.getName(propPath))) {
// already handled by createNode above -> ignore
continue;
}
// none of the special properties -> let the diffhandler take care
// of the property creation/modification.
dh.setProperty(paramName, null);
}
// save the complete set of modifications
session.save();
success = true;
} finally {
if (!success) {
session.refresh(false);
}
}
return null; // TODO build loc-href if items were created.
}
/**
*
* @param session
* @param nodePath
* @param data
* @throws RepositoryException
*/
private static void createNode(Session session, String nodePath, RequestData data) throws RepositoryException {
Node parent = session.getRootNode();
String[] smgts = Text.explode(nodePath, '/');
for (String nodeName : smgts) {
if (parent.hasNode(nodeName)) {
parent = parent.getNode(nodeName);
} else {
// need to create the node
// TODO: won't work for SNS
String nPath = parent.getPath() + "/" + nodeName;
String ntName = data.getParameter(nPath + "/" + JcrConstants.JCR_PRIMARYTYPE);
if (ntName == null) {
parent = parent.addNode(nodeName);
} else {
parent = parent.addNode(nodeName, ntName);
}
}
}
}
/**
*
* @param request
* @return
* @throws DavException
*/
private static Session getRepositorySession(WebdavRequest request) throws DavException {
DavSession ds = request.getDavSession();
return JcrDavSession.getRepositorySession(ds);
}
/**
* Returns the temp directory
*
* @return the temp directory
*/
private static File getTempDirectory(ServletContext servletCtx) {
return (File) servletCtx.getAttribute(ATTR_TMP_DIRECTORY);
}
//--------------------------------------------------------------------------
/**
* Locator factory that specially deals with hrefs having a .json extension.
*/
private static class DavLocatorFactoryImpl extends org.apache.jackrabbit.webdav.jcr.DavLocatorFactoryImpl {
public DavLocatorFactoryImpl(String s) {
super(s);
}
@Override
public DavResourceLocator createResourceLocator(String prefix, String href) {
DavResourceLocator loc = super.createResourceLocator(prefix, href);
if (endsWithJson(href)) {
loc = new WrappingLocator(super.createResourceLocator(prefix, href));
}
return loc;
}
@Override
public DavResourceLocator createResourceLocator(String prefix, String workspacePath, String path, boolean isResourcePath) {
DavResourceLocator loc = super.createResourceLocator(prefix, workspacePath, path, isResourcePath);
if (isResourcePath && endsWithJson(path)) {
loc = new WrappingLocator(loc);
}
return loc;
}
private static boolean endsWithJson(String s) {
return s.endsWith(".json");
}
}
/**
* Resource locator that removes trailing .json extensions and depth
* selector that do not form part of the repository path.
* As the locator and it's factory do not have access to a JCR session
* the extraJson flag may be reset later on.
*
* @see ResourceFactoryImpl#getItem(org.apache.jackrabbit.webdav.jcr.JcrDavSession, org.apache.jackrabbit.webdav.DavResourceLocator)
*/
private static class WrappingLocator implements DavResourceLocator {
private final DavResourceLocator loc;
private boolean isJsonRequest = true;
private int depth = Integer.MIN_VALUE;
private String repositoryPath;
private WrappingLocator(DavResourceLocator loc) {
this.loc = loc;
}
private void extract() {
String rp = loc.getRepositoryPath();
rp = rp.substring(0, rp.lastIndexOf('.'));
int pos = rp.lastIndexOf(".");
if (pos > -1) {
String depthStr = rp.substring(pos + 1);
try {
depth = Integer.parseInt(depthStr);
rp = rp.substring(0, pos);
} catch (NumberFormatException e) {
// apparently no depth-info -> ignore
}
}
repositoryPath = rp;
}
private int getDepth() {
if (isJsonRequest) {
if (repositoryPath == null) {
extract();
}
return depth;
} else {
return Integer.MIN_VALUE;
}
}
public String getPrefix() {
return loc.getPrefix();
}
public String getResourcePath() {
return loc.getResourcePath();
}
public String getWorkspacePath() {
return loc.getWorkspacePath();
}
public String getWorkspaceName() {
return loc.getWorkspaceName();
}
public boolean isSameWorkspace(DavResourceLocator davResourceLocator) {
return loc.isSameWorkspace(davResourceLocator);
}
public boolean isSameWorkspace(String string) {
return loc.isSameWorkspace(string);
}
public String getHref(boolean b) {
return loc.getHref(b);
}
public boolean isRootLocation() {
return loc.isRootLocation();
}
public DavLocatorFactory getFactory() {
return loc.getFactory();
}
public String getRepositoryPath() {
if (isJsonRequest) {
if (repositoryPath == null) {
extract();
}
return repositoryPath;
} else {
return loc.getRepositoryPath();
}
}
}
/**
* Resource factory used to make sure that the .json extension was properly
* interpreted.
*/
private static class ResourceFactoryImpl extends org.apache.jackrabbit.webdav.jcr.DavResourceFactoryImpl {
/**
* Create a new DavResourceFactoryImpl.
*
* @param txMgr
* @param subsMgr
*/
public ResourceFactoryImpl(TxLockManagerImpl txMgr, SubscriptionManager subsMgr) {
super(txMgr, subsMgr);
}
@Override
protected Item getItem(JcrDavSession sessionImpl, DavResourceLocator locator) throws PathNotFoundException, RepositoryException {
if (locator instanceof WrappingLocator && ((WrappingLocator)locator).isJsonRequest) {
// check if the .json extension has been correctly interpreted.
Session s = sessionImpl.getRepositorySession();
try {
if (s.itemExists(((WrappingLocator)locator).loc.getRepositoryPath())) {
// an item exists with the original calculated repo-path
// -> assume that the repository item path ends with .json
// or .depth.json. i.e. .json wasn't an extra extension
// appended to request the json-serialization of the node.
// -> change the flag in the WrappingLocator correspondingly.
((WrappingLocator) locator).isJsonRequest = false;
}
} catch (RepositoryException e) {
// if the unmodified repository path isn't valid (e.g. /a/b[2].5.json)
// -> ignore.
}
}
return super.getItem(sessionImpl, locator);
}
}
}