Android Open Source - Fon Http Utils

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Back to project page Fon.
License

The source code is released under:
GNU General Public License
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Java Source Code

package org.rsalvaterra.fon;
//w  w w.  j a v a  2 s.  c o  m
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.zip.GZIPInputStream;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
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.HttpUriRequest;
import org.apache.http.entity.HttpEntityWrapper;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

public final class HttpUtils {

  private static final int MAX_TRIES = 3;
  private static final String USER_AGENT_STRING = "FONAccess; wispr; (Linux; U; Android)";
  private static final String HEADER_ACCEPT_ENCODING = "Accept-Encoding";
  private static final String ENCODING_GZIP = "gzip";
  private static final HttpParams HTTP_PARAMETERS = new BasicHttpParams().setParameter(CoreProtocolPNames.USER_AGENT, HttpUtils.USER_AGENT_STRING);

  private static DefaultHttpClient getHttpClient() {
    final DefaultHttpClient client = new DefaultHttpClient(HttpUtils.HTTP_PARAMETERS);
    client.addRequestInterceptor(new HttpRequestInterceptor() {

      public void process(final HttpRequest request, final HttpContext context) {
        if (!request.containsHeader(HttpUtils.HEADER_ACCEPT_ENCODING)) {
          request.addHeader(HttpUtils.HEADER_ACCEPT_ENCODING, HttpUtils.ENCODING_GZIP);
        }
      }
    });
    client.addResponseInterceptor(new HttpResponseInterceptor() {

      public void process(final HttpResponse response, final HttpContext context) {
        // Inflate any responses compressed with gzip
        final Header encoding = response.getEntity().getContentEncoding();
        if (encoding != null) {
          for (final HeaderElement element : encoding.getElements()) {
            if (element.getName().equalsIgnoreCase(HttpUtils.ENCODING_GZIP)) {
              response.setEntity(new HttpEntityWrapper(response.getEntity()) {

                @Override
                public InputStream getContent() throws IOException {
                  return new GZIPInputStream(wrappedEntity.getContent());
                }

                @Override
                public long getContentLength() {
                  return -1;
                }
              });
              break;
            }
          }
        }
      }
    });
    client.setCookieStore(null);
    return client;
  }

  private static String getUrlCommon(final HttpUriRequest httpreq) {
    final BasicHttpContext context = new BasicHttpContext();
    final DefaultHttpClient client = HttpUtils.getHttpClient();
    int tries = 0;
    while (tries < HttpUtils.MAX_TRIES) {
      try {
        final HttpEntity entity = client.execute(httpreq, context).getEntity();
        if (entity != null) {
          return EntityUtils.toString(entity).trim();
        }
      } catch (final IOException se) {
        ++tries;
      }
    }
    return null;
  }

  public static String getUrl(final String url) {
    return HttpUtils.getUrlCommon(new HttpGet(url));
  }

  public static String getUrlByPost(final String url, final ArrayList<BasicNameValuePair> formParams) {
    final UrlEncodedFormEntity form;
    try {
      form = new UrlEncodedFormEntity(formParams, HTTP.UTF_8);
    } catch (final UnsupportedEncodingException e) {
      return null;
    }
    final HttpPost httpreq = new HttpPost(url);
    httpreq.setEntity(form);
    return HttpUtils.getUrlCommon(httpreq);
  }
}
Java Source Code List
