Android Open Source - RealtimeStorage-Android Rest Webservice

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License

The source code is released under:
MIT License
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Java Source Code

package co.realtime.storage;
//ww  w.  j ava 2s.  c  om

import ibt.ortc.api.OnRestWebserviceResponse;
import ibt.ortc.api.Strings;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

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

class RestWebservice {
  
  protected static void getAsync(URL url,OnRestWebserviceResponse callback){
    requestAsync(url,"GET", null, callback);
  }
  
  protected static void postAsync(URL url,String content,OnRestWebserviceResponse callback){
    requestAsync(url,"POST", content, callback);
  }
  
  private static void requestAsync(final URL url,final String method, final String content,final OnRestWebserviceResponse callback){
    Runnable task = new Runnable() {
      
      @Override
      public void run() {
        if(method.equals("GET")){
          try {
            String result = "https".equals(url.getProtocol()) ? secureGetRequest(url) : unsecureGetRequest(url);
            
            callback.run(null, result);
          } catch (Exception error) {
            
            callback.run(error, null);            
          }
        }else if(method.equals("POST")){
          String result = null;
          try {
            result = "https".equals(url.getProtocol()) ? securePostRequest(url,content) : unsecurePostRequest(url,content);
          } catch (Exception e) {
            callback.run(e, null);
          }
          if(result != null)
            callback.run(null, result);
        }else{          
          callback.run(new Exception("Invalid request method - " + method), null);
        }
      }
    };
    
    new Thread(task).start();    
  }
  
  private static String unsecureGetRequest(URL url) throws Exception {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();    
    
    //connection.setDoOutput(true);

    String result = "";
    
    InputStream responseBody = null;
    if(connection.getResponseCode() != 200 && connection.getResponseCode() != -1){      
      responseBody = connection.getErrorStream();      
      
      result = readResponseBody(responseBody);
      
      throw new Exception(result);
    }else{
      responseBody = connection.getInputStream();
      if(responseBody == null){
        responseBody = connection.getErrorStream();        
        
        result = readResponseBody(responseBody);
        
        throw new Exception(result);
      }else{
        result = readResponseBody(responseBody);
      }
    }

    return result;
  }
  
  private static String secureGetRequest(URL url) throws Exception {
    HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
    
    //connection.setDoOutput(true);

    String result = "";
    
    if(connection.getResponseCode() != 200){
      BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
      String line;
      while ((line = rd.readLine()) != null) {
        result += line;
      }
      rd.close();
      
      throw new Exception(result);
    }else{
      BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));
      String line;
      while ((line = rd.readLine()) != null) {
        result += line;
      }
      rd.close();
    }

    return result;
  }  

  private static String unsecurePostRequest(URL url, String postBody) throws Exception {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();    
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Content-Type", "application/json");
    connection.setRequestProperty("Accept", "application/json");
    connection.setDoOutput(true);
    OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());

    wr.write(postBody);

    wr.flush();
    
    String result = "";
    
    if(connection.getResponseCode() != 200){
      BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
      String line;
      while ((line = rd.readLine()) != null) {
        result += line;
      }
      rd.close();
      
      throw new Exception(result);
    }else{
      BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));
      String line;
      while ((line = rd.readLine()) != null) {
        result += line;
      }
      rd.close();
    }
    wr.close();

    return result;
  }
  
  private static String securePostRequest(URL url, String postBody) throws Exception {    
    
    //URL url = new URL("https://ortc-mobilepush.realtime.co/mp/topicdevices/YOUR_CHANNEL");
    //String postBody = "{\"applicationKey\": \"YOUR_APP_KEY\", \"privateKey\": \"YOUR_PRV_KEY\"}";
    
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

    SSLContext sc;
    sc = SSLContext.getInstance("TLS");  
    sc.init(null, null, new java.security.SecureRandom());

    conn.setSSLSocketFactory(sc.getSocketFactory());
    conn.setRequestMethod("POST");
    conn.setDoInput(true);
    conn.setRequestProperty("Content-Type", "application/json");

    DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
    wr.writeBytes(postBody);
    wr.flush();
    wr.close();

    conn.connect();
    BufferedReader stdIn = new BufferedReader(new InputStreamReader(conn.getInputStream()));

    StringBuffer response = new StringBuffer();
    String line;
    while ((line = stdIn.readLine()) != null) {
      response.append(line);
    }
    stdIn.close();
    return response.toString();
    
    /*
    SSLSocketFactory sslsocketfactory =  (SSLSocketFactory) SSLSocketFactory.getDefault();      
    SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket(url.getHost(), url.getPort());        
    sslsocket.setEnabledProtocols(new String[] {"SSLv3"});
    
    OutputStream outputstream = sslsocket.getOutputStream();
    OutputStreamWriter outputstreamwriter = new OutputStreamWriter(outputstream);
    BufferedWriter bufferedwriter = new BufferedWriter(outputstreamwriter);

    BufferedReader stdIn = new BufferedReader(new InputStreamReader(sslsocket.getInputStream()));
    
    String request = String.format("POST %s HTTP/1.1\r\n",url.getFile()) + 
            "Content-Type: application/json\r\n" +
            "Content-Length: "+String.valueOf(postBody.length())+"\r\n\r\n" + postBody;
    
    bufferedwriter.write(request);
    bufferedwriter.flush();
    
    String response = "";
    String line;
    int responseLenght = 0;
    while ((line = stdIn.readLine()) != null) {
      if(line.startsWith("Content-Length")){
        String l = line.replaceAll("Content-Length: ", "");
        responseLenght = Integer.parseInt(l);
      }
      if(Strings.isNullOrEmpty(line)) break;//headerEnded = true;
    }
    if(responseLenght >0){
      char[] buffer = new char[responseLenght];
      stdIn.read(buffer, 0, responseLenght);
      response = new String(buffer);      
    }
    outputstream.close();
    stdIn.close();
    sslsocket.close();
    bufferedwriter.close();
    
    return response;
    */
  }
  
  
  private static String readResponseBody(InputStream responseBody){
    String result = "";
    
    if(responseBody != null){
      BufferedReader rd = new BufferedReader(new InputStreamReader(responseBody));
      String line;
      try {
        while ((line = rd.readLine()) != null) {
          result += line;
        }
        rd.close();
      } catch (Exception e) { 
        result = e.getMessage();
      } 
    }
    
    return result;
  }
}
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