/**
* 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.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.camel.AsyncCallback;
import org.apache.camel.CamelExchangeException;
import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultAsyncProducer;
import org.restlet.Client;
import org.restlet.Context;
import org.restlet.Request;
import org.restlet.Response;
import org.restlet.Uniform;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A Camel producer that acts as a client to Restlet server.
*
* @version
*/
public class RestletProducer extends DefaultAsyncProducer {
private static final Logger LOG = LoggerFactory.getLogger(RestletProducer.class);
private static final Pattern PATTERN = Pattern.compile("\\(([\\w\\.]*)\\)");
private Client client;
private boolean throwException;
public RestletProducer(RestletEndpoint endpoint) throws Exception {
super(endpoint);
this.throwException = endpoint.isThrowExceptionOnFailure();
client = new Client(endpoint.getProtocol());
client.setContext(new Context());
client.setConnectTimeout(100);
client.getContext().getParameters().add("socketTimeout", String.valueOf(endpoint.getSocketTimeout()));
client.getContext().getParameters().add("socketConnectTimeoutMs", String.valueOf(endpoint.getSocketTimeout()));
}
@Override
public void doStart() throws Exception {
super.doStart();
client.start();
}
@Override
public void doStop() throws Exception {
client.stop();
super.doStop();
}
@Override
public boolean process(final Exchange exchange, final AsyncCallback callback) {
RestletEndpoint endpoint = (RestletEndpoint) getEndpoint();
final RestletBinding binding = endpoint.getRestletBinding();
Request request;
try {
String resourceUri = buildUri(endpoint, exchange);
request = new Request(endpoint.getRestletMethod(), resourceUri);
binding.populateRestletRequestFromExchange(request, exchange);
} catch (CamelExchangeException e) {
// break out in case of exception
exchange.setException(e);
callback.done(true);
return true;
}
// process the request asynchronously
LOG.debug("Sending request: {} for exchangeId: {}", request, exchange.getExchangeId());
client.handle(request, new Uniform() {
@Override
public void handle(Request request, Response response) {
LOG.debug("Received response: {} for exchangeId: {}", response, exchange.getExchangeId());
try {
if (response != null) {
Integer respCode = response.getStatus().getCode();
if (respCode > 207 && throwException) {
exchange.setException(populateRestletProducerException(exchange, response, respCode));
} else {
binding.populateExchangeFromRestletResponse(exchange, response);
}
}
} catch (Exception e) {
exchange.setException(e);
}
}
});
callback.done(false);
return false;
}
private static String buildUri(RestletEndpoint endpoint, Exchange exchange) throws CamelExchangeException {
String uri = endpoint.getProtocol() + "://" + endpoint.getHost() + ":" + endpoint.getPort() + endpoint.getUriPattern();
// substitute { } placeholders in uri and use mandatory headers
LOG.trace("Substituting '(value)' placeholders in uri: {}", uri);
Matcher matcher = PATTERN.matcher(uri);
while (matcher.find()) {
String key = matcher.group(1);
String header = exchange.getIn().getHeader(key, String.class);
// header should be mandatory
if (header == null) {
throw new CamelExchangeException("Header with key: " + key + " not found in Exchange", exchange);
}
if (LOG.isTraceEnabled()) {
LOG.trace("Replacing: {} with header value: {}", matcher.group(0), header);
}
uri = matcher.replaceFirst(header);
// we replaced uri so reset and go again
matcher.reset(uri);
}
String query = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);
if (query != null) {
LOG.trace("Adding query: {} to uri: {}", query, uri);
uri = addQueryToUri(uri, query);
}
LOG.trace("Using uri: {}", uri);
return uri;
}
protected static String addQueryToUri(String uri, String query) {
if (uri == null || uri.length() == 0) {
return uri;
}
StringBuilder answer = new StringBuilder();
int index = uri.indexOf('?');
if (index < 0) {
answer.append(uri);
answer.append("?");
answer.append(query);
} else {
answer.append(uri.substring(0, index));
answer.append("?");
answer.append(query);
String remaining = uri.substring(index + 1);
if (remaining.length() > 0) {
answer.append("&");
answer.append(remaining);
}
}
return answer.toString();
}
protected RestletOperationException populateRestletProducerException(Exchange exchange, Response response, int responseCode) {
RestletOperationException exception;
String uri = response.getRequest().getResourceRef().toString();
String statusText = response.getStatus().getDescription();
Map<String, String> headers = parseResponseHeaders(response, exchange);
String copy;
if (response.getEntity() != null) {
try {
copy = response.getEntity().getText();
} catch (Exception ex) {
copy = ex.toString();
}
} else {
copy = response.toString();
}
if (responseCode >= 300 && responseCode < 400) {
String redirectLocation;
if (response.getStatus().isRedirection()) {
redirectLocation = response.getLocationRef().getHostIdentifier();
exception = new RestletOperationException(uri, responseCode, statusText, redirectLocation, headers, copy);
} else {
//no redirect location
exception = new RestletOperationException(uri, responseCode, statusText, null, headers, copy);
}
} else {
//internal server error(error code 500)
exception = new RestletOperationException(uri, responseCode, statusText, null, headers, copy);
}
return exception;
}
protected Map<String, String> parseResponseHeaders(Object response, Exchange camelExchange) {
Map<String, String> answer = new HashMap<String, String>();
if (response instanceof Response) {
for (Map.Entry<String, Object> entry : ((Response) response).getAttributes().entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
LOG.trace("Parse external header {}={}", key, value);
answer.put(key, value.toString());
}
}
return answer;
}
}