/*******************************************************************************
* Copyright 2012 University of Southern California
*
* Licensed 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.
*
* This code was developed by the Information Integration Group as part
* of the Karma project at the Information Sciences Institute of the
* University of Southern California. For more information, publications,
* and related projects, please see: http://www.isi.edu/integration
******************************************************************************/
package edu.isi.karma.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import org.json.XML;
public class HTTPUtil {
private HTTPUtil() {
}
public enum HTTP_METHOD {
GET, POST, PUT, DELETE, HEAD
}
public enum HTTP_HEADERS {
Accept,
}
public static String executeHTTPPostRequest(String serviceURL, String contentType,
String acceptContentType, HttpEntity entity)
throws ClientProtocolException, IOException {
HttpPost httpPost = new HttpPost(serviceURL);
httpPost.setEntity(entity);
return invokeHTTPRequest(httpPost, contentType, acceptContentType);
}
public static String executeHTTPPostRequest(String serviceURL, String contentType,
String acceptContentType, Map<String, String> formParameters)
throws ClientProtocolException, IOException {
// Prepare the message body parameters
List<NameValuePair> formParams = new ArrayList<>();
for (Map.Entry<String, String> stringStringEntry : formParameters.entrySet()) {
formParams.add(new BasicNameValuePair(stringStringEntry.getKey(), stringStringEntry.getValue()));
}
return executeHTTPPostRequest(serviceURL, contentType, acceptContentType, new UrlEncodedFormEntity(formParams, "UTF-8"));
}
public static String executeHTTPPostRequest(String serviceURL, String contentType,
String acceptContentType, String rawPostBodyData)
throws ClientProtocolException, IOException {
// Prepare the headers
HttpPost httpPost = new HttpPost(serviceURL);
httpPost.setEntity(new StringEntity(rawPostBodyData));
return invokeHTTPRequest(httpPost, contentType, acceptContentType);
}
private static String invokeHTTPRequest(HttpPost httpPost, String contentType,
String acceptContentType) throws ClientProtocolException, IOException {
HttpClient httpClient = new DefaultHttpClient();
if (acceptContentType != null && !acceptContentType.isEmpty()) {
httpPost.setHeader(HTTP_HEADERS.Accept.name(), acceptContentType);
}
if (contentType != null && !contentType.isEmpty()) {
httpPost.setHeader("Content-Type", contentType);
}
// Execute the request
HttpResponse response = httpClient.execute(httpPost);
// Parse the response and store it in a String
HttpEntity entity = response.getEntity();
StringBuilder responseString = new StringBuilder();
if (entity != null) {
BufferedReader buf = new BufferedReader(new InputStreamReader(entity.getContent(),"UTF-8"));
String line = buf.readLine();
while(line != null) {
responseString.append(line);
responseString.append('\n');
line = buf.readLine();
}
}
return responseString.toString();
}
public static String executeHTTPGetRequest(String uri, String acceptContentType)
throws ClientProtocolException, IOException {
HttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(uri);
if(acceptContentType != null && !acceptContentType.isEmpty()) {
request.setHeader(HTTP_HEADERS.Accept.name(), acceptContentType);
}
HttpResponse response = httpClient.execute(request);
// Parse the response and store it in a String
HttpEntity entity = response.getEntity();
StringBuilder responseString = new StringBuilder();
if (entity != null) {
BufferedReader buf = new BufferedReader(new InputStreamReader(entity.getContent()));
String line = buf.readLine();
while(line != null) {
responseString.append(line);
responseString.append('\n');
line = buf.readLine();
}
}
return responseString.toString();
}
public static Object executeAndParseHTTPGetService(String uri, boolean includeInputAttributes) throws ClientProtocolException, IOException {
HttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(uri);
request.setHeader(HTTP_HEADERS.Accept.name(), "application/json; text/xml");
HttpResponse response = httpClient.execute(request);
// Parse the response and store it in a String
HttpEntity entity = response.getEntity();
StringBuilder responseString = new StringBuilder();
if (entity != null) {
BufferedReader buf = new BufferedReader(new InputStreamReader(entity.getContent()));
String line = buf.readLine();
while(line != null) {
responseString.append(line);
responseString.append('\n');
line = buf.readLine();
}
}
Object output = null;
if(entity.getContentType().toString().indexOf("xml") != -1) {
output = XML.toJSONObject(responseString.toString());
} else if(entity.getContentType().toString().indexOf("json") != -1){
output = JSONUtil.createJson(responseString.toString());
}
if(output != null && includeInputAttributes) {
String[] queryParams = request.getURI().getQuery().split("&");
JSONObject nestedArr;
if(output instanceof JSONObject)
nestedArr = (JSONObject)output;
else {
nestedArr = new JSONObject();
nestedArr.put("output", output);
}
for(String queryParam: queryParams) {
String[] param = queryParam.split("=");
String name = param[0];
String value = param[1];
nestedArr.put(name, value);
}
JSONObject result = new JSONObject();
result.put("nestedArray", nestedArr);
return result;
} else {
return output;
}
}
public static String executeHTTPDeleteRequest(String uri)
throws ClientProtocolException, IOException {
HttpClient httpClient = new DefaultHttpClient();
HttpDelete request = new HttpDelete(uri);
HttpResponse response = httpClient.execute(request);
// Parse the response and store it in a String
HttpEntity entity = response.getEntity();
StringBuilder responseString = new StringBuilder();
if (entity != null) {
BufferedReader buf = new BufferedReader(new InputStreamReader(entity.getContent()));
String line = buf.readLine();
while(line != null) {
responseString.append(line);
responseString.append('\n');
line = buf.readLine();
}
}
return responseString.toString();
}
}