/**
* Extracts the response from the method as a InputStream.
*
* @param method the method that was executed
* @return the response either as a stream, or as a deserialized java object
* @throws IOException can be thrown
*/
protected static Object extractResponseBody(HttpMethod method, Exchange exchange)
throws IOException, ClassNotFoundException {
InputStream is = method.getResponseBodyAsStream();
if (is == null) {
return null;
}
Header header = method.getResponseHeader(Exchange.CONTENT_ENCODING);
String contentEncoding = header != null ? header.getValue() : null;
if (!exchange.getProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.FALSE, Boolean.class)) {
is = GZIPHelper.uncompressGzip(contentEncoding, is);
}
// Honor the character encoding
String contentType = null;
header = method.getResponseHeader("content-type");
if (header != null) {
contentType = header.getValue();
// find the charset and set it to the Exchange
HttpHelper.setCharsetFromContentType(contentType, exchange);
}
InputStream response = doExtractResponseBodyAsStream(is, exchange);
// if content type is a serialized java object then de-serialize it back to a Java object
if (contentType != null
&& contentType.equals(HttpConstants.CONTENT_TYPE_JAVA_SERIALIZED_OBJECT)) {
return HttpHelper.deserializeJavaObjectFromStream(response);
} else {
return response;
}
}
protected void populateResponse(
Exchange exchange,
HttpMethod method,
Message in,
HeaderFilterStrategy strategy,
int responseCode)
throws IOException, ClassNotFoundException {
// We just make the out message is not create when extractResponseBody throws exception,
Object response = extractResponseBody(method, exchange);
Message answer = exchange.getOut();
answer.setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
answer.setBody(response);
// propagate HTTP response headers
Header[] headers = method.getResponseHeaders();
for (Header header : headers) {
String name = header.getName();
String value = header.getValue();
if (name.toLowerCase().equals("content-type")) {
name = Exchange.CONTENT_TYPE;
exchange.setProperty(Exchange.CHARSET_NAME, IOHelper.getCharsetNameFromContentType(value));
}
// use http helper to extract parameter value as it may contain multiple values
Object extracted = HttpHelper.extractHttpParameterValue(value);
if (strategy != null && !strategy.applyFilterToExternalHeaders(name, extracted, exchange)) {
HttpHelper.appendHeader(answer.getHeaders(), name, extracted);
}
}
// preserve headers from in by copying any non existing headers
// to avoid overriding existing headers with old values
MessageHelper.copyHeaders(exchange.getIn(), answer, false);
}
/**
* Creates the HttpMethod to use to call the remote server, either its GET or POST.
*
* @param exchange the exchange
* @return the created method as either GET or POST
* @throws CamelExchangeException is thrown if error creating RequestEntity
*/
@SuppressWarnings("deprecation")
protected HttpMethod createMethod(Exchange exchange) throws Exception {
// creating the url to use takes 2-steps
String url = HttpHelper.createURL(exchange, getEndpoint());
URI uri = HttpHelper.createURI(exchange, url, getEndpoint());
// get the url and query string from the uri
url = uri.toASCIIString();
String queryString = uri.getRawQuery();
// execute any custom url rewrite
String rewriteUrl = HttpHelper.urlRewrite(exchange, url, getEndpoint(), this);
if (rewriteUrl != null) {
// update url and query string from the rewritten url
url = rewriteUrl;
uri = new URI(url);
// use raw query to have uri decimal encoded which http client requires
queryString = uri.getRawQuery();
}
// remove query string as http client does not accept that
if (url.indexOf('?') != -1) {
url = url.substring(0, url.indexOf('?'));
}
// create http holder objects for the request
RequestEntity requestEntity = createRequestEntity(exchange);
HttpMethods methodToUse =
HttpHelper.createMethod(exchange, getEndpoint(), requestEntity != null);
HttpMethod method = methodToUse.createMethod(url);
if (queryString != null) {
// need to encode query string
queryString = UnsafeUriCharactersEncoder.encode(queryString);
method.setQueryString(queryString);
}
LOG.trace("Using URL: {} with method: {}", url, method);
if (methodToUse.isEntityEnclosing()) {
((EntityEnclosingMethod) method).setRequestEntity(requestEntity);
if (requestEntity != null && requestEntity.getContentType() == null) {
LOG.debug("No Content-Type provided for URL: {} with exchange: {}", url, exchange);
}
}
// there must be a host on the method
if (method.getHostConfiguration().getHost() == null) {
throw new IllegalArgumentException(
"Invalid uri: "
+ url
+ ". If you are forwarding/bridging http endpoints, then enable the bridgeEndpoint option on the endpoint: "
+ getEndpoint());
}
return method;
}
/**
* Creates a holder object for the data to send to the remote server.
*
* @param exchange the exchange with the IN message with data to send
* @return the data holder
* @throws CamelExchangeException is thrown if error creating RequestEntity
*/
protected RequestEntity createRequestEntity(Exchange exchange) throws CamelExchangeException {
Message in = exchange.getIn();
if (in.getBody() == null) {
return null;
}
RequestEntity answer = in.getBody(RequestEntity.class);
if (answer == null) {
try {
Object data = in.getBody();
if (data != null) {
String contentType = ExchangeHelper.getContentType(exchange);
if (contentType != null
&& HttpConstants.CONTENT_TYPE_JAVA_SERIALIZED_OBJECT.equals(contentType)) {
// serialized java object
Serializable obj = in.getMandatoryBody(Serializable.class);
// write object to output stream
ByteArrayOutputStream bos = new ByteArrayOutputStream();
HttpHelper.writeObjectToStream(bos, obj);
answer =
new ByteArrayRequestEntity(
bos.toByteArray(), HttpConstants.CONTENT_TYPE_JAVA_SERIALIZED_OBJECT);
IOHelper.close(bos);
} else if (data instanceof File || data instanceof GenericFile) {
// file based (could potentially also be a FTP file etc)
File file = in.getBody(File.class);
if (file != null) {
answer = new FileRequestEntity(file, contentType);
}
} else if (data instanceof String) {
// be a bit careful with String as any type can most likely be converted to String
// so we only do an instanceof check and accept String if the body is really a String
// do not fallback to use the default charset as it can influence the request
// (for example application/x-www-form-urlencoded forms being sent)
String charset = IOHelper.getCharsetName(exchange, false);
answer = new StringRequestEntity((String) data, contentType, charset);
}
// fallback as input stream
if (answer == null) {
// force the body as an input stream since this is the fallback
InputStream is = in.getMandatoryBody(InputStream.class);
answer = new InputStreamRequestEntity(is, contentType);
}
}
} catch (UnsupportedEncodingException e) {
throw new CamelExchangeException(
"Error creating RequestEntity from message body", exchange, e);
} catch (IOException e) {
throw new CamelExchangeException("Error serializing message body", exchange, e);
}
}
return answer;
}