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Camel REST (Restlet baesd) Component
/**
* 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.camel.component.restlet;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Map;
import javax.xml.transform.dom.DOMSource;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.converter.jaxp.StringSource;
import org.apache.camel.spi.HeaderFilterStrategy;
import org.apache.camel.spi.HeaderFilterStrategyAware;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.restlet.data.ChallengeResponse;
import org.restlet.data.ChallengeScheme;
import org.restlet.data.CharacterSet;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Method;
import org.restlet.data.Parameter;
import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.data.Status;
/**
* Default Restlet binding implementation
*
* @version $Revision: 1005717 $
*/
public class DefaultRestletBinding implements RestletBinding, HeaderFilterStrategyAware {
private static final Log LOG = LogFactory.getLog(DefaultRestletBinding.class);
private HeaderFilterStrategy headerFilterStrategy;
public void populateExchangeFromRestletRequest(Request request, Exchange exchange) throws Exception {
Message inMessage = exchange.getIn();
// extract headers from restlet
for (Map.Entry entry : request.getAttributes().entrySet()) {
if (!headerFilterStrategy.applyFilterToExternalHeaders(entry.getKey(), entry.getValue(), exchange)) {
inMessage.setHeader(entry.getKey(), entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("Populate exchange from Restlet request header: "
+ entry.getKey() + " value: " + entry.getValue());
}
}
}
// copy query string to header
String query = request.getResourceRef().getQuery();
if (query != null) {
inMessage.setHeader(Exchange.HTTP_QUERY, query);
}
// copy URI to header
inMessage.setHeader(Exchange.HTTP_URI, request.getResourceRef().getIdentifier(true));
// copy HTTP method to header
inMessage.setHeader(Exchange.HTTP_METHOD, request.getMethod().toString());
if (!request.isEntityAvailable()) {
return;
}
// only deal with the form if the content type is "application/x-www-form-urlencoded"
if (request.getEntity().getMediaType().equals(MediaType.APPLICATION_WWW_FORM)) {
Form form = new Form(request.getEntity());
for (Map.Entry entry : form.getValuesMap().entrySet()) {
if (entry.getValue() == null) {
inMessage.setBody(entry.getKey());
if (LOG.isDebugEnabled()) {
LOG.debug("Populate exchange from Restlet request body: " + entry.getValue());
}
} else {
if (!headerFilterStrategy.applyFilterToExternalHeaders(entry.getKey(), entry.getValue(), exchange)) {
inMessage.setHeader(entry.getKey(), entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("Populate exchange from Restlet request user header: "
+ entry.getKey() + " value: " + entry.getValue());
}
}
}
}
} else {
inMessage.setBody(request.getEntity().getStream());
}
}
public void populateRestletRequestFromExchange(Request request, Exchange exchange) {
request.setReferrerRef("camel-restlet");
String body = exchange.getIn().getBody(String.class);
Form form = new Form();
// add the body as the key in the form with null value
form.add(body, null);
MediaType mediaType = exchange.getIn().getHeader(Exchange.CONTENT_TYPE, MediaType.class);
if (mediaType == null) {
mediaType = MediaType.APPLICATION_WWW_FORM;
}
if (LOG.isDebugEnabled()) {
LOG.debug("Populate Restlet request from exchange body: " + body + " using media type " + mediaType);
}
// login and password are filtered by header filter strategy
String login = exchange.getIn().getHeader(RestletConstants.RESTLET_LOGIN, String.class);
String password = exchange.getIn().getHeader(RestletConstants.RESTLET_PASSWORD, String.class);
if (login != null && password != null) {
ChallengeResponse authentication = new ChallengeResponse(ChallengeScheme.HTTP_BASIC, login, password);
request.setChallengeResponse(authentication);
if (LOG.isDebugEnabled()) {
LOG.debug("Basic HTTP Authentication has been applied");
}
}
for (Map.Entry entry : exchange.getIn().getHeaders().entrySet()) {
if (!headerFilterStrategy.applyFilterToCamelHeaders(entry.getKey(), entry.getValue(), exchange)) {
// Use forms only for GET and POST/x-www-form-urlencoded
if (request.getMethod() == Method.GET || (request.getMethod() == Method.POST && mediaType == MediaType.APPLICATION_WWW_FORM)) {
if (entry.getKey().startsWith("org.restlet.")) {
// put the org.restlet headers in attributes
request.getAttributes().put(entry.getKey(), entry.getValue());
} else {
// put the user stuff in the form
form.add(entry.getKey(), entry.getValue().toString());
}
} else {
// For non-form post put all the headers in attributes
request.getAttributes().put(entry.getKey(), entry.getValue());
}
if (LOG.isDebugEnabled()) {
LOG.debug("Populate Restlet request from exchange header: "
+ entry.getKey() + " value: " + entry.getValue());
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Using Content Type: " + mediaType + " for POST data: " + body);
}
// Only URL Encode for GET and form POST
if (request.getMethod() == Method.GET || (request.getMethod() == Method.POST && mediaType == MediaType.APPLICATION_WWW_FORM)) {
request.setEntity(form.getWebRepresentation());
} else {
request.setEntity(body, mediaType);
}
}
public void populateRestletResponseFromExchange(Exchange exchange, Response response) {
Message out;
if (exchange.isFailed()) {
// 500 for internal server error which can be overridden by response code in header
response.setStatus(Status.valueOf(500));
if (exchange.hasOut() && exchange.getOut().isFault()) {
out = exchange.getOut();
} else {
// print exception as message and stacktrace
Exception t = exchange.getException();
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
t.printStackTrace(pw);
response.setEntity(sw.toString(), MediaType.TEXT_PLAIN);
return;
}
} else {
out = exchange.getOut();
}
// get content type
MediaType mediaType = out.getHeader(Exchange.CONTENT_TYPE, MediaType.class);
if (mediaType == null) {
Object body = out.getBody();
mediaType = MediaType.TEXT_PLAIN;
if (body instanceof String) {
mediaType = MediaType.TEXT_PLAIN;
} else if (body instanceof StringSource || body instanceof DOMSource) {
mediaType = MediaType.TEXT_XML;
}
}
// get response code
Integer responseCode = out.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
if (responseCode != null) {
response.setStatus(Status.valueOf(responseCode));
}
for (Map.Entry entry : out.getHeaders().entrySet()) {
if (!headerFilterStrategy.applyFilterToCamelHeaders(entry.getKey(), entry.getValue(), exchange)) {
response.getAttributes().put(entry.getKey(), entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("Populate Restlet response from exchange header: "
+ entry.getKey() + " value: " + entry.getValue());
}
}
}
String text = out.getBody(String.class);
if (LOG.isDebugEnabled()) {
LOG.debug("Populate Restlet response from exchange body: " + text);
}
response.setEntity(text, mediaType);
if (exchange.getProperty(Exchange.CHARSET_NAME) != null) {
CharacterSet cs = CharacterSet.valueOf(exchange.getProperty(Exchange.CHARSET_NAME, String.class));
response.getEntity().setCharacterSet(cs);
}
}
public void populateExchangeFromRestletResponse(Exchange exchange, Response response) throws Exception {
for (Map.Entry entry : response.getAttributes().entrySet()) {
if (!headerFilterStrategy.applyFilterToExternalHeaders(entry.getKey(), entry.getValue(), exchange)) {
exchange.getOut().setHeader(entry.getKey(), entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("Populate exchange from Restlet response header: "
+ entry.getKey() + " value: " + entry.getValue());
}
}
}
// set response code
int responseCode = response.getStatus().getCode();
exchange.getOut().setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
if (response.getEntity() != null) {
// get content type
MediaType mediaType = response.getEntity().getMediaType();
if (mediaType != null) {
exchange.getOut().setHeader(Exchange.CONTENT_TYPE, mediaType.toString());
}
// get content text
String text = response.getEntity().getText();
if (LOG.isDebugEnabled()) {
LOG.debug("Populate exchange from Restlet response: " + text);
}
exchange.getOut().setBody(text);
}
}
public HeaderFilterStrategy getHeaderFilterStrategy() {
return headerFilterStrategy;
}
public void setHeaderFilterStrategy(HeaderFilterStrategy strategy) {
headerFilterStrategy = strategy;
}
}
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