/**
* 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.ambari.server.proxy;
import com.google.gson.Gson;
import org.apache.ambari.server.controller.internal.URLStreamProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static javax.ws.rs.core.MediaType.APPLICATION_JSON;
import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.core.MediaType;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.util.Map;
import java.util.List;
import java.util.HashMap;
@Path("/")
public class ProxyService {
private static final int URL_CONNECT_TIMEOUT = 20000;
private static final int URL_READ_TIMEOUT = 15000;
private static final int HTTP_ERROR_RANGE_START = Response.Status.BAD_REQUEST.getStatusCode();
private static final String REQUEST_TYPE_GET = "GET";
private static final String REQUEST_TYPE_POST = "POST";
private static final String REQUEST_TYPE_PUT = "PUT";
private static final String REQUEST_TYPE_DELETE = "DELETE";
private static final String QUERY_PARAMETER_URL = "url=";
private static final String AMBARI_PROXY_PREFIX = "AmbariProxy-";
private static final String ERROR_PROCESSING_URL = "Error occurred during processing URL ";
private final static Logger LOG = LoggerFactory.getLogger(ProxyService.class);
@GET
public Response processGetRequestForwarding(@Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(REQUEST_TYPE_GET, ui, null, headers);
}
@POST
@Consumes({MediaType.WILDCARD, MediaType.TEXT_PLAIN, MediaType.TEXT_XML, MediaType.APPLICATION_FORM_URLENCODED, MediaType.APPLICATION_JSON})
public Response processPostRequestForwarding(InputStream body, @Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(REQUEST_TYPE_POST, ui, body, headers);
}
@PUT
@Consumes({MediaType.WILDCARD, MediaType.TEXT_PLAIN, MediaType.TEXT_XML, MediaType.APPLICATION_FORM_URLENCODED, MediaType.APPLICATION_JSON})
public Response processPutRequestForwarding(InputStream body, @Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(REQUEST_TYPE_PUT, ui, body, headers);
}
@DELETE
public Response processDeleteRequestForwarding(@Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(REQUEST_TYPE_DELETE, ui, null, headers);
}
private Response handleRequest(String requestType, UriInfo ui, InputStream body, HttpHeaders headers) {
URLStreamProvider urlStreamProvider = new URLStreamProvider(URL_CONNECT_TIMEOUT,
URL_READ_TIMEOUT, null, null, null);
String query = ui.getRequestUri().getQuery();
if (query != null && query.indexOf(QUERY_PARAMETER_URL) != -1) {
String url = query.replaceFirst(QUERY_PARAMETER_URL, "");
try {
HttpURLConnection connection = urlStreamProvider.processURL(url, requestType, body, getHeaderParamsToForward(headers));
int responseCode = connection.getResponseCode();
InputStream resultInputStream = null;
if (responseCode >= HTTP_ERROR_RANGE_START) {
resultInputStream = connection.getErrorStream();
} else {
resultInputStream = connection.getInputStream();
}
String contentType = connection.getContentType();
Response.ResponseBuilder rb = Response.status(responseCode);
if (contentType.indexOf(APPLICATION_JSON) != -1) {
rb.entity(new Gson().fromJson(new InputStreamReader(resultInputStream), Map.class));
} else {
rb.entity(resultInputStream);
}
return rb.type(contentType).build();
} catch (IOException e) {
LOG.error(ERROR_PROCESSING_URL + url, e);
return Response.status(Response.Status.BAD_REQUEST.getStatusCode()).type(MediaType.TEXT_PLAIN).
entity(e.getMessage()).build();
}
}
return null;
}
private Map<String, List<String>> getHeaderParamsToForward(HttpHeaders headers) {
Map<String, List<String>> headerParamsToForward = new HashMap<String, List<String>>();
for (String paramName: headers.getRequestHeaders().keySet()) {
if (paramName.startsWith(AMBARI_PROXY_PREFIX)) {
headerParamsToForward.put(paramName.replaceAll(AMBARI_PROXY_PREFIX,""), headers.getRequestHeader(paramName));
}
}
return headerParamsToForward;
}
}