Android Open Source - smsgcm-client Http Utilities

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License

The source code is released under:

Apache License

Java Source Code

package com.omgren.apps.smsgcm.client;
/*from   w  w w .  java2 s.  c  om*/
import static com.omgren.apps.smsgcm.client.CommonUtilities.TAG;
import static java.net.URLEncoder.encode;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;

import android.content.Context;
import android.util.Log;

/**
 * Helper class used to communicate with the demo server.
 */
public final class HttpUtilities {

  /**
   * Something to make a query string quickly.
   *
   * @param params A map of parameters
   *
   * @return a byte array of the query string
   */
  private static byte[] makeQueryString(Map<String, String> params){
    StringBuilder bodyBuilder = new StringBuilder();
    Iterator<Entry<String, String>> iterator = params.entrySet().iterator();
    // constructs the POST body using the parameters
    while (iterator.hasNext()) {
      Entry<String, String> param = iterator.next();
      try {
        bodyBuilder.append(encode(param.getKey(), "UTF-8")).append('=')
          .append(encode(param.getValue(), "UTF-8"));
      } catch (UnsupportedEncodingException e) {
        Log.e(TAG, "problem with encoding" + e);
      }
      if (iterator.hasNext()) {
        bodyBuilder.append('&');
      }
    }
    String body = bodyBuilder.toString();
    return body.getBytes();
  }

  /**
   * Opens a HttpURLConnection object from the URL
   *
   * @param endpoint A url to connect to
   *
   * @return an HttpURLConnection object
   *
   * @throws IOException
   */
  private static HttpURLConnection urlConnect(final Context context, String endpoint) throws IOException {
    URL url;

    try {
      url = new URL(endpoint);

    } catch (MalformedURLException e) {
      throw new IllegalArgumentException("invalid url: " + endpoint);
    }

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

    if( url.getHost().equals("smsgcm.omgren.com") ){
      SSLContext sslContext = CertUtilities.getSSLContext(context);
      ((HttpsURLConnection)conn).setSSLSocketFactory(sslContext.getSocketFactory());
    }

    return conn;
  }

  /**
   * Downloads HTTP content.
   *
   * @param url URL address.
   *
   * @return content of url address.
   */
  public static String get(final Context context, String url) throws IOException {
    BufferedReader buf = null;
    HttpURLConnection conn = null;
    String ret = null;
    try {
      conn = urlConnect(context, url);
      buf = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));

      int status = conn.getResponseCode();
      if (status != 200) {
        throw new IOException("Get failed with error code " + status);
      }

      StringBuffer sb = new StringBuffer();
      String buffer;
      while((buffer = buf.readLine()) != null)
        sb.append(buffer);

      buf.close();
      ret = sb.toString();

    } finally {
      if (conn != null)
        conn.disconnect();
    }

    return ret;
  }

  /**
   * Issue a POST request to the server.
   *
   * @param endpoint POST address.
   * @param params request parameters.
   *
   * @throws IOException propagated from POST.
   */
  public static void post(final Context context, String endpoint, Map<String, String> params) throws IOException {
    byte[] bytes = makeQueryString(params);
    HttpURLConnection conn = null;
    try {
      conn = urlConnect(context, endpoint);
      conn.setDoOutput(true);
      conn.setUseCaches(false);
      conn.setFixedLengthStreamingMode(bytes.length);
      conn.setRequestMethod("POST");
      conn.setRequestProperty("Content-Type",
          "application/x-www-form-urlencoded;charset=UTF-8");
      // post the request
      OutputStream out = conn.getOutputStream();
      out.write(bytes);
      out.close();
      // handle the response
      int status = conn.getResponseCode();
      if (status != 200) {
        throw new IOException("Post failed with error code " + status);
      }
    } finally {
      if (conn != null) {
        conn.disconnect();
      }
    }
  }

}

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