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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.client.methods;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.jackrabbit.webdav.DavConstants;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.MultiStatus;
import org.apache.jackrabbit.webdav.lock.LockDiscovery;
import org.apache.jackrabbit.webdav.observation.EventDiscovery;
import org.apache.jackrabbit.webdav.observation.ObservationConstants;
import org.apache.jackrabbit.webdav.observation.Subscription;
import org.apache.jackrabbit.webdav.observation.SubscriptionDiscovery;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;
/**
* Base class for HTTP request classes defined in this package.
*/
public abstract class BaseDavRequest extends HttpEntityEnclosingRequestBase {
private static Logger log = LoggerFactory.getLogger(BaseDavRequest.class);
public BaseDavRequest(URI uri) {
super();
super.setURI(uri);
}
/**
* Gets a {@link Document} representing the response body.
* @return document or {@code null} for null entity
* @throws IOException in case of I/O or XMP pasting problems
*/
public Document getResponseBodyAsDocument(HttpEntity entity) throws IOException {
if (entity == null) {
return null;
} else {
// read response and try to build a xml document
InputStream in = entity.getContent();
try {
return DomUtil.parseDocument(in);
} catch (ParserConfigurationException ex) {
throw new IOException("XML parser configuration error", ex);
} catch (SAXException ex) {
throw new IOException("XML parsing error", ex);
} finally {
in.close();
}
}
}
/**
* Return response body as {@link MultiStatus} object.
* @throws IllegalStateException when response does not represent a {@link MultiStatus}
* @throws DavException for failures in obtaining/parsing the response body
*/
public MultiStatus getResponseBodyAsMultiStatus(HttpResponse response) throws DavException {
try {
Document doc = getResponseBodyAsDocument(response.getEntity());
if (doc == null) {
throw new DavException(response.getStatusLine().getStatusCode(), "no response body");
}
return MultiStatus.createFromXml(doc.getDocumentElement());
} catch (IOException ex) {
throw new DavException(response.getStatusLine().getStatusCode(), ex);
}
}
/**
* Return response body as {@link LockDiscovery} object.
* @throws IllegalStateException when response does not represent a {@link LockDiscovery}
* @throws DavException for failures in obtaining/parsing the response body
*/
public LockDiscovery getResponseBodyAsLockDiscovery(HttpResponse response) throws DavException {
try {
Document doc = getResponseBodyAsDocument(response.getEntity());
if (doc == null) {
throw new DavException(response.getStatusLine().getStatusCode(), "no response body");
}
Element root = doc.getDocumentElement();
if (!DomUtil.matches(root, DavConstants.XML_PROP, DavConstants.NAMESPACE)
&& DomUtil.hasChildElement(root, DavConstants.PROPERTY_LOCKDISCOVERY, DavConstants.NAMESPACE)) {
throw new DavException(response.getStatusLine().getStatusCode(),
"Missing DAV:prop response body in LOCK response.");
}
Element lde = DomUtil.getChildElement(root, DavConstants.PROPERTY_LOCKDISCOVERY, DavConstants.NAMESPACE);
if (!DomUtil.hasChildElement(lde, DavConstants.XML_ACTIVELOCK, DavConstants.NAMESPACE)) {
throw new DavException(response.getStatusLine().getStatusCode(),
"The DAV:lockdiscovery must contain a least a single DAV:activelock in response to a successful LOCK request.");
}
return LockDiscovery.createFromXml(lde);
} catch (IOException ex) {
throw new DavException(response.getStatusLine().getStatusCode(), ex);
}
}
/**
* Return response body as {@link SubscriptionDiscovery} object.
* @throws IllegalStateException when response does not represent a {@link SubscriptionDiscovery}
* @throws DavException for failures in obtaining/parsing the response body
*/
public SubscriptionDiscovery getResponseBodyAsSubscriptionDiscovery(HttpResponse response) throws DavException {
try {
Document doc = getResponseBodyAsDocument(response.getEntity());
if (doc == null) {
throw new DavException(response.getStatusLine().getStatusCode(), "no response body");
}
Element root = doc.getDocumentElement();
if (!DomUtil.matches(root, DavConstants.XML_PROP, DavConstants.NAMESPACE)
&& DomUtil.hasChildElement(root, ObservationConstants.SUBSCRIPTIONDISCOVERY.getName(),
ObservationConstants.SUBSCRIPTIONDISCOVERY.getNamespace())) {
throw new DavException(response.getStatusLine().getStatusCode(),
"Missing DAV:prop response body in SUBSCRIBE response.");
}
Element sde = DomUtil.getChildElement(root, ObservationConstants.SUBSCRIPTIONDISCOVERY.getName(),
ObservationConstants.SUBSCRIPTIONDISCOVERY.getNamespace());
SubscriptionDiscovery sd = SubscriptionDiscovery.createFromXml(sde);
if (((Subscription[]) sd.getValue()).length > 0) {
return sd;
} else {
throw new DavException(response.getStatusLine().getStatusCode(),
"Missing 'subscription' elements in SUBSCRIBE response body. At least a single subscription must be present if SUBSCRIBE was successful.");
}
} catch (IOException ex) {
throw new DavException(response.getStatusLine().getStatusCode(), ex);
}
}
/**
* Return response body as {@link EventDiscovery} object.
* @throws IllegalStateException when response does not represent a {@link EventDiscovery}
* @throws DavException for failures in obtaining/parsing the response body
*/
public EventDiscovery getResponseBodyAsEventDiscovery(HttpResponse response) throws DavException {
try {
Document doc = getResponseBodyAsDocument(response.getEntity());
if (doc == null) {
throw new DavException(response.getStatusLine().getStatusCode(), "no response body");
}
return EventDiscovery.createFromXml(doc.getDocumentElement());
} catch (IOException ex) {
throw new DavException(response.getStatusLine().getStatusCode(), ex);
}
}
/**
* Check the response and throw when it is considered to represent a failure.
*/
public void checkSuccess(HttpResponse response) throws DavException {
if (!succeeded(response)) {
throw getResponseException(response);
}
}
/**
* Obtain a {@link DavException} representing the response.
* @throws IllegalStateException when the response is considered to be successful
*/
public DavException getResponseException(HttpResponse response) {
if (succeeded(response)) {
String msg = "Cannot retrieve exception from successful response.";
log.warn(msg);
throw new IllegalStateException(msg);
}
StatusLine st = response.getStatusLine();
Element responseRoot = null;
try {
responseRoot = getResponseBodyAsDocument(response.getEntity()).getDocumentElement();
} catch (IOException e) {
// non-parseable body -> use null element
}
return new DavException(st.getStatusCode(), st.getReasonPhrase(), null, responseRoot);
}
/**
* Check the provided {@link HttpResponse} for successful execution. The default implementation treats all
* 2xx status codes (RFC 7231, Section 6.3).
* Implementations can further restrict the accepted range of responses (or even check the response body).
*/
public boolean succeeded(HttpResponse response) {
int status = response.getStatusLine().getStatusCode();
return status >= 200 && status <= 299;
}
}
