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/*******************************************************************************
* Copyright (c) 2012-2013 University of Stuttgart.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and the Apache License 2.0 which both accompany this distribution,
* and are available at http://www.eclipse.org/legal/epl-v10.html
* and http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
/*
* Modifications Copyright 2016-2017 ZTE Corporation.
*/
/**
* This static-class eases HTTP-method execution by self-managed fault-handling
* and automated Response-information processing
*/
package org.opentosca.bpel4restlight.rest;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class LowLevelRestApi {
protected static final Log log = LogFactory.getLog(LowLevelRestApi.class);
// Local HttpClient used for every communication (Singleton implementation)
// private static HttpClient httpClient = new HttpClient();
/**
* Executes a passed HttpMethod (Method type is either PUT, POST, GET or
* DELETE) and returns a HttpResponseMessage
*
* @param method Method to execute
* @return HttpResponseMessage which contains all information about the
* execution
*/
public static HttpResponseMessage executeHttpMethod(HttpMethod method) {
HttpResponseMessage responseMessage = null;
try {
log.debug("Method invocation on URI: \n");
log.debug(method.getURI().toString());
// Execute Request
HttpClient httpClient = new HttpClient();
httpClient.executeMethod(method);
responseMessage = LowLevelRestApi.extractResponseInformation(method);
} catch (Exception e) {
log.error("call rest error:", e);
} finally {
// Release Connection anyway
method.releaseConnection();
}
// Extract response information and return
return responseMessage;
}
/**
* Extracts the response information from an executed HttpMethod
*
* @param method Executed Method
* @return Packaged response information
*/
private static HttpResponseMessage extractResponseInformation(HttpMethod method) {
// Create and return HttpResponseMethod
HttpResponseMessage responseMessage = new HttpResponseMessage();
responseMessage.setStatusCode(method.getStatusCode());
try {
responseMessage.setResponseBody(getResponseBody(method));
} catch (Exception e) {
log.error(e);
}
return responseMessage;
}
/**
* getResponseBody
*
* get response body info, if response body is a json object, then translate json object to xml
* if the rest request failed, i.e. the response body is a 404 error page, then response the body with header <root>
* @param method
* @return
* @throws ParseException
*/
private static String getResponseBody(HttpMethod method) throws ParseException
{
String result = null;
try {
result = method.getResponseBodyAsString();
log.debug("result:");
log.debug(result);
} catch (IOException e) {
log.error(e);
}
Header header = method.getRequestHeader("Accept");
if ("application/json".equals(header.getValue())) {
StringBuilder sb = new StringBuilder();
sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>");
sb.append("<root>");
if(result != null && !"".equals(result)) {
/**
if(result.startsWith("<html>")) {
sb.append("<![CDATA[");
sb.append(result);
sb.append("]]>");
} else {
Object json = new JSONParser().parse(result);
json2Xml(sb, "obj", json);
}
*/
try {
Object json = new JSONParser().parse(result);
json2Xml(sb, "obj", json);
} catch (Exception e) {
log.error(e);
sb.append("<![CDATA[");
sb.append(result);
sb.append("]]>");
}
}
sb.append("</root>");
log.debug("responseBody:");
log.debug(sb.toString());
return sb.toString();
}
return result;
}
@SuppressWarnings("unchecked")
public static void json2Xml(StringBuilder sb, String key, Object jsonObject) {
if(jsonObject == null) {
sb.append("<error>empty</error>");
return;
}
if(jsonObject instanceof JSONArray) {
JSONArray array = (JSONArray) jsonObject;
sb.append("<").append(key).append("s").append(">");
for(int i=0, len=array.size(); i<len; i++) {
json2Xml(sb, key, array.get(i));
}
sb.append("</").append(key).append("s").append(">");
return;
} else if(jsonObject instanceof JSONObject) {
sb.append("<").append(key).append(">");
JSONObject json = (JSONObject) jsonObject;
for(Map.Entry<String, Object> entry : (Set<Map.Entry<String, Object>>)json.entrySet()) {
json2Xml(sb, entry.getKey(), entry.getValue());
}
sb.append("</").append(key).append(">");
return;
} else {
sb.append("<").append(key).append(">");
sb.append("<![CDATA[");
sb.append(jsonObject.toString());
sb.append("]]>");
sb.append("</").append(key).append(">");
return;
}
}
}
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