org.openhab.binding.squeezebox.internal.utils.HttpUtils.java Source code

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Here is the source code for org.openhab.binding.squeezebox.internal.utils.HttpUtils.java

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/**
 * Copyright (c) 2014-2015 openHAB UG (haftungsbeschraenkt) and others.
 *
 * 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.squeezebox.internal.utils;

import java.net.URL;
import java.net.URLConnection;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

/**
 * Collection of methods to help retrieve HTTP data from a SqueezeServer
 * 
 * @author Dan Cunningham
 *
 */
public class HttpUtils {
    private static Logger logger = LoggerFactory.getLogger(HttpUtils.class);
    private static int TIMEOUT = 5000;
    private static HttpClient client = new HttpClient();
    /**
     * JSON request to get the CLI port from a Squeeze Server
     */
    private static final String JSON_REQ = "{\"params\": [\"\", [\"pref\" ,\"plugin.cli:cliport\",\"?\"]], \"id\": 1, \"method\": \"slim.request\"}";

    /**
     * Simple logic to perform a post request
     * 
     * @param url
     * @param timeout
     * @return
     */
    public static String post(String url, String postData) throws Exception {
        PostMethod method = new PostMethod(url);
        method.setRequestBody(postData);
        method.getParams().setSoTimeout(TIMEOUT);
        try {
            int statusCode = client.executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: {}", method.getStatusLine());
                throw new Exception("Method failed: " + method.getStatusLine());
            }
            byte[] responseBody = method.getResponseBody();
            return new String(responseBody);
        } finally {
            method.releaseConnection();
        }
    }

    /**
     * Returns a byte array from a URL string
     * 
     * @param urlString
     * @return byte array of data
     */
    public static byte[] getData(String urlString) throws Exception {
        URL url = new URL(urlString);
        URLConnection connection = url.openConnection();
        return IOUtils.toByteArray(connection.getInputStream());
    }

    /**
     * Retrieves the command line port (cli) from a SqueezeServer
     * 
     * @param ip
     * @param webPort
     * @return
     * @throws Exception
     */
    public static int getCliPort(String ip, int webPort) throws Exception {
        String url = "http://" + ip + ":" + webPort + "/jsonrpc.js";
        String json = HttpUtils.post(url, JSON_REQ);
        logger.trace("Recieved json from server {}", json);
        JsonElement resp = new JsonParser().parse(json);
        String cliPort = resp.getAsJsonObject().get("result").getAsJsonObject().get("_p2").getAsString();
        return Integer.parseInt(cliPort);
    }

}