com.dnastack.bob.service.processor.util.HttpUtils.java Source code

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Here is the source code for com.dnastack.bob.service.processor.util.HttpUtils.java

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/*
 * The MIT License
 *
 * Copyright 2014 Miroslav Cupak (mirocupak@gmail.com).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.dnastack.bob.service.processor.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
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.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.client.methods.HttpRequestBase;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

/**
 * Util methods for querying over HTTP.
 *
 * @author Miroslav Cupak (mirocupak@gmail.com)
 * @version 1.0
 */
public class HttpUtils {

    private static HttpGet createGet(String url) {
        HttpGet httpGet;
        httpGet = new HttpGet(url);

        return httpGet;
    }

    private static HttpPost createPost(String url, List<NameValuePair> data) throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);
        httpPost.setEntity(new UrlEncodedFormEntity(data));

        return httpPost;
    }

    /**
     * Creates a GET/POST request object.
     *
     * @param url  url
     * @param post true if we want to create a POST, false for GET
     * @param data payload (only needed for POST)
     *
     * @return request
     *
     * @throws UnsupportedEncodingException
     */
    public static HttpRequestBase createRequest(String url, boolean post, List<NameValuePair> data)
            throws UnsupportedEncodingException {
        return (post) ? createPost(url, data) : createGet(url);
    }

    /**
     * Executes GET/POST and obtain the response.
     *
     * @param request request
     *
     * @return response
     */
    public static String executeRequest(HttpRequestBase request) {
        String response = null;

        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                @Override
                public String handleResponse(final HttpResponse response)
                        throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        return entity != null ? EntityUtils.toString(entity) : null;
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }
            };

            response = httpclient.execute(request, responseHandler);
        } catch (IOException ex) {
            // ignore, response already set to null
        } finally {
            try {
                httpclient.close();
            } catch (IOException ex) {
                // ignore
            }
        }

        return response;
    }
}