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/*
* 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.webdav.simple;
import org.apache.jackrabbit.server.BasicCredentialsProvider;
import org.apache.jackrabbit.server.CredentialsProvider;
import org.apache.jackrabbit.server.SessionProvider;
import org.apache.jackrabbit.server.SessionProviderImpl;
import org.apache.jackrabbit.webdav.DavLocatorFactory;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceFactory;
import org.apache.jackrabbit.webdav.DavSessionProvider;
import org.apache.jackrabbit.webdav.WebdavRequest;
import org.apache.jackrabbit.webdav.lock.LockManager;
import org.apache.jackrabbit.webdav.lock.SimpleLockManager;
import org.apache.jackrabbit.webdav.server.AbstractWebdavServlet;
import org.apache.jackrabbit.webdav.util.HttpDateTimeFormatter;
import org.apache.tika.detect.Detector;
import org.apache.tika.mime.MimeTypeException;
import org.apache.tika.mime.MimeTypesFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.Repository;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.time.format.DateTimeParseException;
/**
* WebdavServlet provides WebDAV support (level
* {@link org.apache.jackrabbit.webdav.DavCompliance#_1_ 1},
* {@link org.apache.jackrabbit.webdav.DavCompliance#_2_ 2},
* {@link org.apache.jackrabbit.webdav.DavCompliance#_3_ 3} and
* {@link org.apache.jackrabbit.webdav.DavCompliance#BIND bind} compliant) for
* repository resources.
*
* Implementations of this abstract class must implement the
* {@link #getRepository()} method to access the repository.
*/
public abstract class SimpleWebdavServlet extends AbstractWebdavServlet {
/**
* the default logger
*/
private static final Logger log = LoggerFactory.getLogger(SimpleWebdavServlet.class);
/**
* init param name of the repository prefix
*/
public static final String INIT_PARAM_RESOURCE_PATH_PREFIX = "resource-path-prefix";
/**
* Name of the init parameter that specify a separate configuration used
* for filtering the resources displayed.
*/
public static final String INIT_PARAM_RESOURCE_CONFIG = "resource-config";
/**
* Name of the parameter that specifies the servlet resource path of
* a custom <mime-info/> configuration file. The default setting
* is to use the MIME media type database included in Apache Tika.
*/
public static final String INIT_PARAM_MIME_INFO = "mime-info";
/**
* Servlet context attribute used to store the path prefix instead of
* having a static field with this servlet. The latter causes problems
* when running multiple
*/
public static final String CTX_ATTR_RESOURCE_PATH_PREFIX = "jackrabbit.webdav.simple.resourcepath";
/**
* the resource path prefix
*/
private String resourcePathPrefix;
/**
* Map used to remember any webdav lock created without being reflected
* in the underlying repository.
* This is needed because some clients rely on a successful locking
* mechanism in order to perform properly (e.g. mac OSX built-in dav client)
*/
private LockManager lockManager;
/**
* the resource factory
*/
private DavResourceFactory resourceFactory;
/**
* the locator factory
*/
private DavLocatorFactory locatorFactory;
/**
* the webdav session provider
*/
private DavSessionProvider davSessionProvider;
/**
* the repository session provider
*/
private SessionProvider sessionProvider;
/**
* The config
*/
private ResourceConfig config;
/**
* Init this servlet
*
* @throws ServletException
*/
@Override
public void init() throws ServletException {
super.init();
resourcePathPrefix = getInitParameter(INIT_PARAM_RESOURCE_PATH_PREFIX);
if (resourcePathPrefix == null) {
log.debug("Missing path prefix > setting to empty string.");
resourcePathPrefix = "";
} else if (resourcePathPrefix.endsWith("/")) {
log.debug("Path prefix ends with '/' > removing trailing slash.");
resourcePathPrefix = resourcePathPrefix.substring(0, resourcePathPrefix.length() - 1);
}
getServletContext().setAttribute(CTX_ATTR_RESOURCE_PATH_PREFIX, resourcePathPrefix);
log.info(INIT_PARAM_RESOURCE_PATH_PREFIX + " = '" + resourcePathPrefix + "'");
config = new ResourceConfig(getDetector());
String configParam = getInitParameter(INIT_PARAM_RESOURCE_CONFIG);
if (configParam != null) {
try {
config.parse(getServletContext().getResource(configParam));
} catch (MalformedURLException e) {
log.debug("Unable to build resource filter provider", e);
}
}
}
/**
* Reads and returns the configured <mime-info/> database.
*
* @see #INIT_PARAM_MIME_INFO
* @return MIME media type database
* @throws ServletException if the database is invalid or can not be read
*/
private Detector getDetector() throws ServletException {
URL url;
String mimeInfo = getInitParameter(INIT_PARAM_MIME_INFO);
if (mimeInfo != null) {
try {
url = getServletContext().getResource(mimeInfo);
} catch (MalformedURLException e) {
throw new ServletException(
"Invalid " + INIT_PARAM_MIME_INFO
+ " configuration setting: " + mimeInfo, e);
}
} else {
url = MimeTypesFactory.class.getResource("tika-mimetypes.xml");
}
try {
return MimeTypesFactory.create(url);
} catch (MimeTypeException e) {
throw new ServletException(
"Invalid MIME media type database: " + url, e);
} catch (IOException e) {
throw new ServletException(
"Unable to read MIME media type database: " + url, e);
}
}
/**
* {@inheritDoc}
*/
@Override
protected boolean isPreconditionValid(WebdavRequest request,
DavResource resource) {
long ifUnmodifiedSince = UNDEFINED_TIME;
try {
// will throw if multiple field lines present
String value = AbstractWebdavServlet.getSingletonField(request, "If-Unmodified-Since");
if (value != null) {
ifUnmodifiedSince = HttpDateTimeFormatter.parse(value);
}
} catch (IllegalArgumentException | DateTimeParseException ex) {
log.debug("illegal value for if-unmodified-since ignored: " + ex.getMessage());
}
if (ifUnmodifiedSince > UNDEFINED_TIME && resource.exists()) {
if (resource.getModificationTime() / 1000 > ifUnmodifiedSince / 1000) {
return false;
}
}
return request.matchesIfHeader(resource);
}
/**
* Returns the configured path prefix
*
* @return resourcePathPrefix
* @see #INIT_PARAM_RESOURCE_PATH_PREFIX
*/
public String getPathPrefix() {
return resourcePathPrefix;
}
/**
* Returns the configured path prefix
*
* @param ctx The servlet context.
* @return resourcePathPrefix
* @see #INIT_PARAM_RESOURCE_PATH_PREFIX
*/
public static String getPathPrefix(ServletContext ctx) {
return (String) ctx.getAttribute(CTX_ATTR_RESOURCE_PATH_PREFIX);
}
/**
* Returns the DavLocatorFactory. If no locator factory has
* been set or created a new instance of {@link org.apache.jackrabbit.webdav.simple.LocatorFactoryImpl} is
* returned.
*
* @return the locator factory
* @see AbstractWebdavServlet#getLocatorFactory()
*/
@Override
public DavLocatorFactory getLocatorFactory() {
if (locatorFactory == null) {
locatorFactory = new LocatorFactoryImplEx(resourcePathPrefix);
}
return locatorFactory;
}
/**
* Sets the DavLocatorFactory.
*
* @param locatorFactory The DavLocatorFactory to use.
* @see AbstractWebdavServlet#setLocatorFactory(DavLocatorFactory)
*/
@Override
public void setLocatorFactory(DavLocatorFactory locatorFactory) {
this.locatorFactory = locatorFactory;
}
/**
* Returns the LockManager. If no lock manager has
* been set or created a new instance of {@link SimpleLockManager} is
* returned.
*
* @return the lock manager
*/
public LockManager getLockManager() {
if (lockManager == null) {
lockManager = new SimpleLockManager();
}
return lockManager;
}
/**
* Sets the LockManager.
*
* @param lockManager The LockManager to be used.
*/
public void setLockManager(LockManager lockManager) {
this.lockManager = lockManager;
}
/**
* Returns the DavResourceFactory. If no request factory has
* been set or created a new instance of {@link ResourceFactoryImpl} is
* returned.
*
* @return the resource factory
* @see AbstractWebdavServlet#getResourceFactory()
*/
@Override
public DavResourceFactory getResourceFactory() {
if (resourceFactory == null) {
resourceFactory = new ResourceFactoryImpl(getLockManager(), getResourceConfig());
}
return resourceFactory;
}
/**
* Sets the DavResourceFactory.
*
* @param resourceFactory The DavResourceFactory to use.
* @see AbstractWebdavServlet#setResourceFactory(org.apache.jackrabbit.webdav.DavResourceFactory)
*/
@Override
public void setResourceFactory(DavResourceFactory resourceFactory) {
this.resourceFactory = resourceFactory;
}
/**
* Returns the SessionProvider. If no session provider has been
* set or created a new instance of {@link SessionProviderImpl} that extracts
* credentials from the Authorization request header is
* returned.
*
* @return the session provider
*/
public synchronized SessionProvider getSessionProvider() {
if (sessionProvider == null) {
sessionProvider = new SessionProviderImpl(getCredentialsProvider());
}
return sessionProvider;
}
/**
* Factory method for creating the credentials provider to be used for
* accessing the credentials associated with a request. The default
* implementation returns a {@link BasicCredentialsProvider} instance,
* but subclasses can override this method to add support for other
* types of credentials.
*
* @return the credentials provider
* @since 1.3
*/
protected CredentialsProvider getCredentialsProvider() {
return new BasicCredentialsProvider(getInitParameter(INIT_PARAM_MISSING_AUTH_MAPPING));
}
/**
* Sets the SessionProvider.
*
* @param sessionProvider The SessionProvider to use.
*/
public synchronized void setSessionProvider(SessionProvider sessionProvider) {
this.sessionProvider = sessionProvider;
}
/**
* Returns the DavSessionProvider. If no session provider has
* been set or created a new instance of {@link DavSessionProviderImpl}
* is returned.
*
* @return the session provider
* @see AbstractWebdavServlet#getDavSessionProvider()
*/
@Override
public synchronized DavSessionProvider getDavSessionProvider() {
if (davSessionProvider == null) {
davSessionProvider =
new DavSessionProviderImpl(getRepository(), getSessionProvider());
}
return davSessionProvider;
}
/**
* Sets the DavSessionProvider.
*
* @param sessionProvider The DavSessionProvider to use.
* @see AbstractWebdavServlet#setDavSessionProvider(org.apache.jackrabbit.webdav.DavSessionProvider)
*/
@Override
public synchronized void setDavSessionProvider(DavSessionProvider sessionProvider) {
this.davSessionProvider = sessionProvider;
}
/**
* Returns the resource configuration to be applied
*
* @return the resource configuration.
*/
public ResourceConfig getResourceConfig() {
return config;
}
/**
* Set the resource configuration
*
* @param config The resource configuration.
*/
public void setResourceConfig(ResourceConfig config) {
this.config = config;
}
/**
* Returns the Repository. If no repository has been set or
* created the repository initialized by RepositoryAccessServlet
* is returned.
*
* @return repository
*/
public abstract Repository getRepository();
}