org.openlmis.UiUtils.HttpClient.java Source code

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Here is the source code for org.openlmis.UiUtils.HttpClient.java

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/*
 * This program is part of the OpenLMIS logistics management information system platform software.
 * Copyright  2013 VillageReach
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses. For additional information contact info@OpenLMIS.org.
 */

package org.openlmis.UiUtils;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.AuthCache;
import org.apache.http.client.CookieStore;
import org.apache.http.client.methods.*;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.util.EntityUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import static org.apache.http.client.protocol.ClientContext.AUTH_CACHE;

public class HttpClient {

    public static final String GET = "GET";
    public static final String POST = "POST";
    public static final String PUT = "PUT";

    public static final String HOST = "localhost";
    public static final int PORT = 9091;
    public static final String PROTOCOL = "http";

    private DefaultHttpClient httpClient;
    private BasicHttpContext httpContext;

    public ResponseEntity SendJSON(String json, String url, String commMethod, String username, String password) {

        HttpHost targetHost = new HttpHost(HOST, PORT, PROTOCOL);
        AuthScope localhost = new AuthScope(HOST, PORT);

        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username, password);
        httpClient.getCredentialsProvider().setCredentials(localhost, credentials);

        AuthCache authCache = new BasicAuthCache();
        authCache.put(targetHost, new BasicScheme());

        httpContext.setAttribute(AUTH_CACHE, authCache);

        try {
            return handleRequest(commMethod, json, url, true);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public ResponseEntity SendJSONWithoutHeaders(String json, String url, String commMethod, String username,
            String password) {
        HttpHost targetHost = new HttpHost(HOST, PORT, PROTOCOL);
        AuthScope localhost = new AuthScope(HOST, PORT);

        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username, password);
        httpClient.getCredentialsProvider().setCredentials(localhost, credentials);

        AuthCache authCache = new BasicAuthCache();
        authCache.put(targetHost, new BasicScheme());

        httpContext.setAttribute(AUTH_CACHE, authCache);

        try {
            return handleRequest(commMethod, json, url, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private ResponseEntity handleRequest(String commMethod, String json, String url, boolean headersRequired)
            throws IOException {
        HttpResponse response;
        HttpEntity entity;
        BufferedReader rd;
        String sCurrentLine;
        String sCompleteResponse = "";

        HttpRequestBase httpRequest = getHttpRequest(commMethod, url);

        if (headersRequired)
            prepareRequestHeaderAndEntity(commMethod, json, httpRequest, true);
        else
            prepareRequestHeaderAndEntity(commMethod, json, httpRequest, false);

        response = httpClient.execute(httpRequest, httpContext);
        entity = response.getEntity();

        rd = new BufferedReader(new InputStreamReader(entity.getContent()));

        ResponseEntity responseEntity = new ResponseEntity();
        responseEntity.setStatus(response.getStatusLine().getStatusCode());

        while ((sCurrentLine = rd.readLine()) != null) {
            sCompleteResponse = sCompleteResponse + (sCurrentLine);
        }
        responseEntity.setResponse(sCompleteResponse);
        EntityUtils.consume(entity);

        return responseEntity;
    }

    private HttpRequestBase getHttpRequest(String commMethod, String url) {
        switch (commMethod) {
        case GET:
            return new HttpGet(url);
        case POST:
            return new HttpPost(url);
        case PUT:
            return new HttpPut(url);
        }
        return null;
    }

    private void prepareRequestHeaderAndEntity(String commMethod, String json, HttpRequestBase httpRequest,
            boolean headerRequired) throws UnsupportedEncodingException {
        if (commMethod.equals(GET))
            return;

        httpRequest.setHeader(new BasicHeader("Content-Type", "application/json;charset=UTF-8"));
        ((HttpEntityEnclosingRequestBase) httpRequest).setEntity(new StringEntity(json));

        if (!headerRequired) {
            Header[] headers = httpRequest.getAllHeaders();
            for (Header h : headers) {
                httpRequest.removeHeader(h);
            }
        }
    }

    public void createContext() {
        this.httpClient = new DefaultHttpClient();
        CookieStore cookieStore = new BasicCookieStore();
        httpContext = new BasicHttpContext();
        httpContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
    }
}