RWEHTTPClient.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.rwesmarthome.internal.communicator.client;

import java.io.IOException;
import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.protocol.HTTP;
import org.openhab.binding.rwesmarthome.internal.communicator.exceptions.RWESmarthomeSessionExpiredException;
import org.openhab.binding.rwesmarthome.internal.communicator.util.HttpComponentsHelper;
import org.openhab.binding.rwesmarthome.internal.communicator.util.InputStream2String;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * HTTP client implementation.
 *
 * @author ollie-dev
 *
 */
public class RWEHTTPClient implements RWEClient {

    private static final Logger logger = LoggerFactory.getLogger(RWEHTTPClient.class);

    /** The http helper. */
    HttpComponentsHelper httpHelper = new HttpComponentsHelper();

    /*
     * (non-Javadoc)
     * 
     * @see org.openhab.binding.rwesmarthome.internal.communicator.client.RWEClient#execute(java.lang.String,
     * java.lang.String)
     */
    @Override
    public String execute(String hostname, String clientId, String request, String command)
            throws IOException, RWESmarthomeSessionExpiredException {
        // prepare connection
        HttpClient httpclient = httpHelper.getNewHttpClient();
        HttpPost httpPost = new HttpPost("https://" + hostname + command);
        httpPost.addHeader("ClientId", clientId);
        httpPost.addHeader("Connection", "Keep-Alive");
        HttpResponse response;
        StringEntity se = new StringEntity(request, HTTP.UTF_8);
        se.setContentType("text/xml");
        httpPost.setEntity(se);

        // execute HTTP request
        logger.trace("executing request: " + httpPost.getURI().toString());
        logger.trace("REQ:" + request);
        response = httpclient.execute(httpPost);
        logger.trace("Response: " + response.toString());

        // handle expired session
        if (response.getStatusLine().getStatusCode() == 401) {
            logger.info("401 Unauthorized returned - Session expired!");
            throw new RWESmarthomeSessionExpiredException("401 Unauthorized returned - Session expired!");
        }

        // handle return
        HttpEntity entity1 = response.getEntity();
        InputStream in = entity1.getContent();
        return InputStream2String.copyFromInputStream(in, "UTF-8");
    }

}