Updated RestRequest client using Apache HttpComponents

REST via Apache HTTP Components.java

package com.proctorcam.proctorserv;

//Standard Java lib
import java.util.*;
import java.io.UnsupportedEncodingException;
import java.io.IOException;

//Apache libs for HTTP POST/GET
import org.apache.http.client.*;
import org.apache.http.client.methods.*;
import org.apache.http.entity.StringEntity;
import org.apache.http.*;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.commons.io.IOUtils;

//GSON lib for JSON parsing 
import com.google.gson.Gson;


public class RestRequestClient
{

  public RestRequestClient()
  {

  }

  /**
   *  makeGetRequest calls HashedAuthenticator.applyReverseGuidAndSign() to mutate params 
   *  into a properly signed request. The GET request to the queryURL (String) created by 
   *  buildURL is made using the Apache HttpComponents library (HttpClient and HttpCore) 
   *  included in the lib directory. A response (HttpResponse) is returned from which the 
   *  response body and status code can be extracted. 
   */

  public HttpResponse makeGetRequest(String url, String customer_identifier, String shared_secret, HashMap<String,Object> params) throws IOException
  {
    HashedAuthenticator.applyReverseGuidAndSign(params, customer_identifier, shared_secret);
    HttpClient client = new DefaultHttpClient();
    String queryURL = buildURL(url, params);
    HttpGet request = new HttpGet(queryURL);
    request.setHeader("Accept", "application/json");
    request.setHeader("Content-type", "application/json");
    HttpResponse response = client.execute(request);


    return response;

  }

  /**
   *  makePostRequest calls HashedAuthenticator.applyReverseGuidAndSign() to mutate params 
   *  into a properly signed request. The POST request to the url (String) is made using 
   *  the Apache HttpComponents library (HttpClient and HttpCore) included in the lib 
   *  directory. A response (HttpResponse) is returned from which the response body and 
   *  status code can be extracted. 
   *
   *  The GSON library (provided in the lib directory) parses params (HashMap) into a JSON
   *  formatted String that can correctly be posted to Proctorserve. 
   */

  public HttpResponse makePostRequest(String url, String customer_identifier, String shared_secret, HashMap<String,Object> params) throws IOException, UnsupportedEncodingException
  {
    HashedAuthenticator.applyReverseGuidAndSign(params, customer_identifier, shared_secret);

    Gson gson = new Gson();
    String json = gson.toJson(params);

    HttpClient client = new DefaultHttpClient();
    HttpPost request = new HttpPost(url);
    request.setHeader("Accept", "application/json");
    request.setHeader("Content-type", "application/json");
    request.setEntity(new StringEntity(json, "UTF-8"));
    HttpResponse response = client.execute(request);

    return response;
  }

  /**
   *  Creates a URL using url (String) and appending to it the key-value pairs
   *  found in params (HashMap). The resulting String is used to make GET requests
   *  in makeGetRequest, 
   */

  protected String buildURL (String url, HashMap<String,Object> params) {
    StringBuilder query = new StringBuilder(url).append("?");
    for (String key : params.keySet()) {
      String data = String.valueOf(params.get(key));
      query.append(key).append("=").append(data).append("&");
    }

    query.deleteCharAt(query.length()-1);
    String queryURL = query.toString();

    return queryURL;
  }

}