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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.File;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.xml.transform.dom.DOMSource;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.StringSource;
import org.apache.camel.WrappedFile;
import org.apache.camel.component.file.GenericFile;
import org.apache.camel.spi.HeaderFilterStrategy;
import org.apache.camel.spi.HeaderFilterStrategyAware;
import org.apache.camel.util.MessageHelper;
import org.restlet.Request;
import org.restlet.Response;
import org.restlet.data.CacheDirective;
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.Preference;
import org.restlet.data.Status;
import org.restlet.engine.application.DecodeRepresentation;
import org.restlet.engine.header.Header;
import org.restlet.engine.header.HeaderConstants;
import org.restlet.representation.FileRepresentation;
import org.restlet.representation.InputRepresentation;
import org.restlet.representation.Representation;
import org.restlet.util.Series;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Default Restlet binding implementation
*/
public class DefaultRestletBinding implements RestletBinding, HeaderFilterStrategyAware {
private static final Logger LOG = LoggerFactory.getLogger(DefaultRestletBinding.class);
private static final String RFC_2822_DATE_PATTERN = "EEE, dd MMM yyyy HH:mm:ss Z";
private HeaderFilterStrategy headerFilterStrategy;
public void populateExchangeFromRestletRequest(Request request, Response response, Exchange exchange) throws Exception {
Message inMessage = exchange.getIn();
inMessage.setHeader(RestletConstants.RESTLET_REQUEST, request);
inMessage.setHeader(RestletConstants.RESTLET_RESPONSE, response);
// extract headers from restlet
for (Map.Entry entry : request.getAttributes().entrySet()) {
if (!headerFilterStrategy.applyFilterToExternalHeaders(entry.getKey(), entry.getValue(), exchange)) {
String key = entry.getKey();
Object value = entry.getValue();
inMessage.setHeader(key, value);
LOG.debug("Populate exchange from Restlet request header: {} value: {}", key, value);
}
}
// we need to dig a bit to grab the content-type
Series series = (Series) request.getAttributes().get(HeaderConstants.ATTRIBUTE_HEADERS);
if (series != null) {
String type = series.getFirstValue(Exchange.CONTENT_TYPE, true);
if (type != null) {
inMessage.setHeader(Exchange.CONTENT_TYPE, type);
}
}
// 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() != null && request.getEntity().getMediaType().equals(MediaType.APPLICATION_WWW_FORM)) {
Form form = new Form(request.getEntity());
for (String paramName : form.getValuesMap().keySet()) {
String[] values = form.getValuesArray(paramName);
Object value = null;
if (values != null && values.length > 0) {
if (values.length == 1) {
value = values[0];
} else {
value = values;
}
}
if (value == null) {
inMessage.setBody(paramName);
LOG.debug("Populate exchange from Restlet request body: {}", paramName);
} else {
if (!headerFilterStrategy.applyFilterToExternalHeaders(paramName, value, exchange)) {
inMessage.setHeader(paramName, value);
LOG.debug("Populate exchange from Restlet request user header: {} value: {}", paramName, value);
}
}
}
} else {
InputStream is = request.getEntity().getStream();
Object body = RestletHelper.readResponseBodyFromInputStream(is, exchange);
inMessage.setBody(body);
}
}
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;
}
LOG.debug("Populate Restlet request from exchange body: {} using media type {}", body, 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);
LOG.debug("Basic HTTP Authentication has been applied");
}
for (Map.Entry entry : exchange.getIn().getHeaders().entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
if (!headerFilterStrategy.applyFilterToCamelHeaders(key, value, 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 (key.startsWith("org.restlet.")) {
// put the org.restlet headers in attributes
request.getAttributes().put(key, value);
} else {
// put the user stuff in the form
if (value instanceof Collection) {
for (Object v : (Collection) value) {
form.add(key, v.toString());
}
} else {
form.add(key, value.toString());
}
}
} else {
// For non-form post put all the headers in attributes
request.getAttributes().put(key, value);
}
LOG.debug("Populate Restlet request from exchange header: {} value: {}", key, value);
}
}
LOG.debug("Using Content Type: {} for POST data: {}", mediaType, 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 {
if (body == null) {
request.setEntity(null);
} else {
request.setEntity(body, mediaType);
}
}
MediaType acceptedMediaType = exchange.getIn().getHeader(Exchange.ACCEPT_CONTENT_TYPE, MediaType.class);
if (acceptedMediaType != null) {
request.getClientInfo().getAcceptedMediaTypes().add(new Preference(acceptedMediaType));
}
}
public void populateRestletResponseFromExchange(Exchange exchange, Response response) throws Exception {
Message out;
if (exchange.isFailed()) {
// 500 for internal server error which can be overridden by response code in header
response.setStatus(Status.valueOf(500));
Message msg = exchange.hasOut() ? exchange.getOut() : exchange.getIn();
if (msg.isFault()) {
out = msg;
} 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.hasOut() ? exchange.getOut() : exchange.getIn();
}
// 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));
}
// set response body according to the message body
Object body = out.getBody();
if (body instanceof WrappedFile) {
// grab body from generic file holder
GenericFile gf = (GenericFile) body;
body = gf.getBody();
}
if (body == null) {
// empty response
response.setEntity("", MediaType.TEXT_PLAIN);
} else if (body instanceof Response) {
// its already a restlet response, so dont do anything
LOG.debug("Using existing Restlet Response from exchange body: {}", body);
} else if (body instanceof Representation) {
response.setEntity(out.getBody(Representation.class));
} else if (body instanceof InputStream) {
response.setEntity(new InputRepresentation(out.getBody(InputStream.class), mediaType));
} else if (body instanceof File) {
response.setEntity(new FileRepresentation(out.getBody(File.class), mediaType));
} else {
// fallback and use string
String text = out.getBody(String.class);
response.setEntity(text, mediaType);
}
LOG.debug("Populate Restlet response from exchange body: {}", body);
if (exchange.getProperty(Exchange.CHARSET_NAME) != null) {
CharacterSet cs = CharacterSet.valueOf(exchange.getProperty(Exchange.CHARSET_NAME, String.class));
response.getEntity().setCharacterSet(cs);
}
// set headers at the end, as the entity must be set first
// NOTE: setting HTTP headers on restlet is cumbersome and its API is "weird" and has some flaws
// so we need to headers two times, and the 2nd time we add the non-internal headers once more
Series series = new Series(Header.class);
for (Map.Entry entry : out.getHeaders().entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
if (!headerFilterStrategy.applyFilterToCamelHeaders(key, value, exchange)) {
boolean added = setResponseHeader(exchange, response, key, value);
if (!added) {
// we only want non internal headers
if (!key.startsWith("Camel") && !key.startsWith("org.restlet")) {
String text = exchange.getContext().getTypeConverter().tryConvertTo(String.class, exchange, value);
if (text != null) {
series.add(key, text);
}
}
}
}
}
// set HTTP headers so we return these in the response
if (!series.isEmpty()) {
response.getAttributes().put(HeaderConstants.ATTRIBUTE_HEADERS, series);
}
}
public void populateExchangeFromRestletResponse(Exchange exchange, Response response) throws Exception {
for (Map.Entry entry : response.getAttributes().entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
if (!headerFilterStrategy.applyFilterToExternalHeaders(key, value, exchange)) {
exchange.getOut().setHeader(key, value);
LOG.debug("Populate exchange from Restlet response header: {} value: {}", key, value);
}
}
// set response code
int responseCode = response.getStatus().getCode();
exchange.getOut().setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
// set restlet response as header so end user have access to it if needed
exchange.getOut().setHeader(RestletConstants.RESTLET_RESPONSE, response);
if (response.getEntity() != null) {
// get content type
MediaType mediaType = response.getEntity().getMediaType();
if (mediaType != null) {
LOG.debug("Setting the Content-Type to be {}", mediaType.toString());
exchange.getOut().setHeader(Exchange.CONTENT_TYPE, mediaType.toString());
}
if (mediaType != null && mediaType.equals(MediaType.APPLICATION_OCTET_STREAM)) {
exchange.getOut().setBody(response.getEntity().getStream());
} else if (response.getEntity() instanceof Representation) {
Representation representationDecoded = new DecodeRepresentation(response.getEntity());
exchange.getOut().setBody(representationDecoded.getText());
} else {
// get content text by default
String text = response.getEntity().getText();
LOG.debug("Populate exchange from Restlet response: {}", text);
exchange.getOut().setBody(text);
}
}
// preserve headers from in by copying any non existing headers
// to avoid overriding existing headers with old values
MessageHelper.copyHeaders(exchange.getIn(), exchange.getOut(), false);
}
@SuppressWarnings("unchecked")
protected boolean setResponseHeader(Exchange exchange, org.restlet.Message message, String header, Object value) {
// there must be a value going forward
if (value == null) {
return true;
}
// must put to attributes
message.getAttributes().put(header, value);
// special for certain headers
if (message.getEntity() != null) {
if (header.equalsIgnoreCase(HeaderConstants.HEADER_CACHE_CONTROL)) {
if (value instanceof List) {
message.setCacheDirectives((List) value);
}
if (value instanceof String) {
List list = new ArrayList();
// set the cache control value directive
list.add(new CacheDirective((String) value));
message.setCacheDirectives(list);
}
return true;
}
if (header.equalsIgnoreCase(HeaderConstants.HEADER_EXPIRES)) {
if (value instanceof Calendar) {
message.getEntity().setExpirationDate(((Calendar) value).getTime());
} else if (value instanceof Date) {
message.getEntity().setExpirationDate((Date) value);
} else if (value instanceof String) {
SimpleDateFormat format = new SimpleDateFormat(RFC_2822_DATE_PATTERN, Locale.ENGLISH);
try {
Date date = format.parse((String) value);
message.getEntity().setExpirationDate(date);
} catch (ParseException e) {
LOG.debug("Header {} with value {} cannot be converted as a Date. The value will be ignored.", HeaderConstants.HEADER_EXPIRES, value);
}
}
return true;
}
if (header.equalsIgnoreCase(HeaderConstants.HEADER_LAST_MODIFIED)) {
if (value instanceof Calendar) {
message.getEntity().setModificationDate(((Calendar) value).getTime());
} else if (value instanceof Date) {
message.getEntity().setModificationDate((Date) value);
} else if (value instanceof String) {
SimpleDateFormat format = new SimpleDateFormat(RFC_2822_DATE_PATTERN, Locale.ENGLISH);
try {
Date date = format.parse((String) value);
message.getEntity().setModificationDate(date);
} catch (ParseException e) {
LOG.debug("Header {} with value {} cannot be converted as a Date. The value will be ignored.", HeaderConstants.HEADER_LAST_MODIFIED, value);
}
}
return true;
}
if (header.equalsIgnoreCase(HeaderConstants.HEADER_CONTENT_LENGTH)) {
if (value instanceof Long) {
message.getEntity().setSize((Long) value);
} else if (value instanceof Integer) {
message.getEntity().setSize((Integer) value);
} else {
Long num = exchange.getContext().getTypeConverter().tryConvertTo(Long.class, value);
if (num != null) {
message.getEntity().setSize(num);
} else {
LOG.debug("Header {} with value {} cannot be converted as a Long. The value will be ignored.", HeaderConstants.HEADER_CONTENT_LENGTH, value);
}
}
return true;
}
if (header.equalsIgnoreCase(HeaderConstants.HEADER_CONTENT_TYPE)) {
if (value instanceof MediaType) {
message.getEntity().setMediaType((MediaType) value);
} else {
String type = value.toString();
MediaType media = MediaType.valueOf(type);
if (media != null) {
message.getEntity().setMediaType(media);
} else {
LOG.debug("Header {} with value {} cannot be converted as a MediaType. The value will be ignored.", HeaderConstants.HEADER_CONTENT_TYPE, value);
}
}
return true;
}
}
return false;
}
public HeaderFilterStrategy getHeaderFilterStrategy() {
return headerFilterStrategy;
}
public void setHeaderFilterStrategy(HeaderFilterStrategy strategy) {
headerFilterStrategy = strategy;
}
}
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