org.envirocar.app.network.HTTPClient.java Source code

Introduction

Here is the source code for org.envirocar.app.network.HTTPClient.java

Source

/* 
 * enviroCar 2013
 * Copyright (C) 2013  
 * Martin Dueren, Jakob Moellers, Gerald Pape, Christopher Stephan
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 * 
 */
package org.envirocar.app.network;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.AbstractHttpEntity;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.envirocar.app.logging.Logger;

import android.net.http.AndroidHttpClient;

/**
 * Utility class to provide secure HTTP network access. 
 * 
 * @author matthes rieke
 *
 */
public class HTTPClient {

    private static final Logger logger = Logger.getLogger(HTTPClient.class);
    public static final int MIN_GZIP_SIZE = 8192;
    private static AndroidHttpClient client;

    static {
        createClient();
        setupClient(client);
    }

    /**
     * execute a http request with a https-capable http client
     * 
     * @param request the http request
     * @return the response, including status and content
     * @throws IOException
     */
    public static HttpResponse execute(HttpUriRequest request) throws IOException {
        AndroidHttpClient client = createClient();
        try {
            HttpResponse result = client.execute(request);
            return result;
        } catch (ClientProtocolException e) {
            throw e;
        } catch (IOException e) {
            throw e;
        }
    }

    /**
     * @return a https-capable http client
     */
    protected synchronized static AndroidHttpClient createClient() {
        if (client == null) {
            client = AndroidHttpClient.newInstance("enviroCar-app");
            setupClient(client);
        }
        return client;
    }

    /**
     * Convenience method to consume the contents of an entity.
     * 
     * @param entity content-holding entity
     */
    public static void consumeEntity(HttpEntity entity) {
        try {
            if (entity == null || entity.getContent() == null)
                return;
            entity.consumeContent();
        } catch (IOException e) {
            logger.warn(e.getMessage());
        }
    }

    /**
     * setup a client instance with SSL/HTTPS capabilities.
     * 
     * @param client the client to set up
     */
    public static void setupClient(HttpClient client) {
        SSLSocketFactory factory = SSLSocketFactory.getSocketFactory();
        factory.setHostnameVerifier(SSLSocketFactory.STRICT_HOSTNAME_VERIFIER);
        client.getConnectionManager().getSchemeRegistry().register(new Scheme("https", factory, 443));
    }

    public static String readResponse(HttpEntity entity) throws IOException {
        //      if (entity == null || entity.getContent() == null || entity.getContentLength() == 0)
        //         return null;
        //      
        //      StringBuilder sb = new StringBuilder();
        //      
        //      Scanner sc = new Scanner(entity.getContent());
        //      while (sc.hasNext()) {
        //         sb.append(sc.nextLine());
        //         sb.append(System.getProperty("line.separator"));
        //      }
        //      sc.close();
        //      
        return EntityUtils.toString(entity, HTTP.UTF_8);
    }

    public static String executeAndParseJsonRequest(String url) throws IOException {
        return readResponse(executeJsonRequest(url));
    }

    public static HttpEntity executeJsonRequest(String url) throws IOException {
        HttpGet getRequest = new HttpGet(url);
        getRequest.addHeader("Accept-Encoding", "application/json");

        HttpResponse response = HTTPClient.execute(getRequest);
        return response.getEntity();
    }

    public static HttpEntity createEntity(byte[] data) throws IOException {
        AbstractHttpEntity entity;
        if (data.length < MIN_GZIP_SIZE) {
            entity = new ByteArrayEntity(data);
        } else {
            ByteArrayOutputStream arr = new ByteArrayOutputStream();
            OutputStream zipper = new GZIPOutputStream(arr);
            zipper.write(data);
            zipper.close();
            entity = new ByteArrayEntity(arr.toByteArray());
            entity.setContentEncoding("gzip");
        }
        return entity;
    }

    public static synchronized void shutdown() {
        if (client != null) {
            try {
                client.close();
            } catch (RuntimeException e) {
                logger.warn(e.getMessage(), e);
            }
        }
    }
}