/**
* DataCleaner (community edition)
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.util.http;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.inject.Inject;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.message.BasicNameValuePair;
import org.datacleaner.user.UserPreferences;
import org.datacleaner.util.xml.XmlUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Utility class for working with HTTP and XML.
*/
public final class HttpXmlUtils {
private static final Logger logger = LoggerFactory.getLogger(HttpXmlUtils.class);
private final UserPreferences _userPreferences;
private final HttpClient _httpClient;
@Inject
public HttpXmlUtils(final UserPreferences userPreferences) {
_userPreferences = userPreferences;
_httpClient = null;
}
public HttpXmlUtils(final HttpClient httpClient) {
_userPreferences = null;
_httpClient = httpClient;
}
public static Element getRootNode(final HttpClient httpClient, final String url)
throws InvalidHttpResponseException {
logger.info("getRootNode({})", url);
try {
final HttpGet method = new HttpGet(url);
final HttpResponse response = httpClient.execute(method);
final int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
logger.error("Response status code was: {} (url={})", statusCode, url);
throw new InvalidHttpResponseException(url, response);
}
final InputStream inputStream = response.getEntity().getContent();
final Document document = XmlUtils.createDocumentBuilder().parse(inputStream);
return (Element) document.getFirstChild();
} catch (final Exception e) {
if (e instanceof RuntimeException) {
throw (RuntimeException) e;
}
throw new IllegalStateException("Could not get root XML node of url=" + url, e);
}
}
public static List<Node> getChildNodesByName(final Node parentNode, final String childNodeName) {
final List<Node> result = new ArrayList<>();
if (childNodeName != null) {
final NodeList childNodes = parentNode.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
final Node childNode = childNodes.item(i);
if (childNodeName.equals(childNode.getNodeName())) {
result.add(childNode);
}
}
}
return result;
}
public static String getChildNodeText(final Node node, final String childNodeName) {
final List<Node> childNodes = getChildNodesByName(node, childNodeName);
if (childNodes.isEmpty()) {
return null;
}
if (childNodes.size() > 1) {
throw new IllegalArgumentException(
"The node " + node + " contains several childNodes named " + childNodeName);
}
return getText(childNodes.get(0));
}
public static String getText(final Node node) {
final Element element = (Element) node;
return element.getTextContent();
}
public String getUrlContent(final String url, Map<String, String> params) throws IOException {
if (params == null) {
params = Collections.emptyMap();
}
logger.info("getUrlContent({},{})", url, params);
final HttpPost method = new HttpPost(url);
final List<NameValuePair> nameValuePairs = new ArrayList<>();
for (final Entry<String, String> entry : params.entrySet()) {
nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
method.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
final ResponseHandler<String> responseHandler = new BasicResponseHandler();
return getHttpClient().execute(method, responseHandler);
}
private HttpClient getHttpClient() {
if (_httpClient == null) {
return _userPreferences.createHttpClient();
}
return _httpClient;
}
}