APICall.java

package com.example.client;

import android.util.Base64;

import com.example.client.request.Request;
import com.example.client.response.Response;

import org.codehaus.jackson.JsonParseException;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.zip.GZIPInputStream;


public class APICall
{
	private Request mRequest = null;
	private APICallTask mAPICallTask = null;
	private Exception mException = null;
	private ResponseStatus mResponseStatus = new ResponseStatus();
	private HttpURLConnection mConnection = null;
	//private HttpsURLConnection mConnection = null; // for SSL
	private OutputStream mRequestStream = null;
	private InputStream mResponseStream = null;


	public APICall(Request request)
	{
		mRequest = request;
	}


	public APICall(Request request, APICallTask task)
	{
		mRequest = request;
		mAPICallTask = task;
	}


	public Request getRequest()
	{
		return mRequest;
	}


	public Exception getException()
	{
		return mException;
	}


	public ResponseStatus getResponseStatus()
	{
		return mResponseStatus;
	}


	public void kill()
	{
		disconnect();
	}


	public Response<?> execute()
	{
		try
		{
			// disables Keep-Alive for all connections
			if(mAPICallTask != null && mAPICallTask.isCancelled()) return null;
			System.setProperty("http.keepAlive", "false");

			// new connection
			byte[] requestData = mRequest.getContent();
			URL url = new URL(mRequest.getAddress());
			mConnection = (HttpURLConnection) url.openConnection();
			//mConnection = (HttpsURLConnection) url.openConnection(); // for SSL

			// ssl connection properties
			//SelfSignedSSLUtility.setupSSLConnection(mConnection, url); // for SSL using self signed certificate
			//CertificateAuthoritySSLUtility.setupSSLConnection(mConnection, url); // for SSL using certificate authority

			// connect
			setupConnection(requestData);
			mConnection.connect();

			// send request
			if(mAPICallTask != null && mAPICallTask.isCancelled()) return null;
			sendRequest(requestData);

			// receive response
			if(mAPICallTask != null && mAPICallTask.isCancelled()) return null;
			mResponseStream = receiveResponse();

			// response info
			//Logcat.d("connection.getURL() = " + mConnection.getURL());
			//Logcat.d("connection.getContentType() = " + mConnection.getContentType());
			//Logcat.d("connection.getContentEncoding() = " + mConnection.getContentEncoding());
			//Logcat.d("connection.getResponseCode() = " + mConnection.getResponseCode());
			//Logcat.d("connection.getResponseMessage() = " + mConnection.getResponseMessage());

			// parse response
			if(mAPICallTask != null && mAPICallTask.isCancelled()) return null;
			Response<?> response = parseResponse();

			if(mAPICallTask != null && mAPICallTask.isCancelled()) return null;
			return response;
		}
		catch(UnknownHostException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(FileNotFoundException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(SocketException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(SocketTimeoutException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(JsonParseException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(IOException e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		catch(Exception e)
		{
			mException = e;
			e.printStackTrace();
			return null;
		}
		finally
		{
			disconnect();
		}
	}


	private void disconnect()
	{
		try
		{
			if(mRequestStream != null) mRequestStream.close();
		}
		catch(IOException e) {}

		try
		{
			if(mResponseStream != null) mResponseStream.close();
		}
		catch(IOException e) {}

		try
		{
			// set status
			if(mConnection != null)
			{
				mResponseStatus.setStatusCode(mConnection.getResponseCode());
				mResponseStatus.setStatusMessage(mConnection.getResponseMessage());
				mConnection.disconnect();
			}
		}
		catch(Throwable e) {}

		mRequestStream = null;
		mResponseStream = null;
		mConnection = null;
	}


	private void setupConnection(byte[] requestData) throws ProtocolException
	{
		if(mRequest.getRequestMethod() != null)
		{
			mConnection.setRequestMethod(mRequest.getRequestMethod()); // GET, POST, OPTIONS, HEAD, PUT, DELETE, TRACE
		}
		if(mRequest.getBasicAuthUsername() != null && mRequest.getBasicAuthPassword() != null)
		{
			mConnection.setRequestProperty("Authorization", getBasicAuthToken(mRequest.getBasicAuthUsername(), mRequest.getBasicAuthPassword()));
		}
		mConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
		//mConnection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + Request.BOUNDARY); // for multipart
		mConnection.setRequestProperty("Accept", "application/json");
		mConnection.setRequestProperty("Accept-Encoding", "gzip");
		mConnection.setRequestProperty("Accept-Charset", "UTF-8");
		//mConnection.setRequestProperty("Content-Length", requestData == null ? "0" : String.valueOf(requestData.length));
		//if(requestData!=null) mConnection.setChunkedStreamingMode(0);
		if(requestData != null) mConnection.setFixedLengthStreamingMode(requestData.length);
		mConnection.setConnectTimeout(30000);
		mConnection.setReadTimeout(30000);
		if(requestData != null)
		{
			// this call automatically sets request method to POST on Android 4
			// if you don't want your app to POST, you must not call setDoOutput
			// http://webdiary.com/2011/12/14/ics-get-post/
			mConnection.setDoOutput(true);
		}
		mConnection.setDoInput(true);
		mConnection.setUseCaches(false);
	}


	private void sendRequest(byte[] requestData) throws IOException
	{
		if(requestData != null)
		{
			mRequestStream = new BufferedOutputStream(mConnection.getOutputStream());
			mRequestStream.write(requestData);
			mRequestStream.flush();
		}
	}


	private InputStream receiveResponse() throws IOException
	{
		InputStream responseStream;
		String encoding = mConnection.getHeaderField("Content-Encoding");
		boolean gzipped = encoding != null && encoding.toLowerCase().contains("gzip");
		try
		{
			InputStream inputStream = mConnection.getInputStream();
			if(gzipped) responseStream = new BufferedInputStream(new GZIPInputStream(inputStream));
			else responseStream = new BufferedInputStream(inputStream);
		}
		catch(FileNotFoundException e)
		{
			// error stream
			InputStream errorStream = mConnection.getErrorStream();
			if(gzipped) responseStream = new BufferedInputStream(new GZIPInputStream(errorStream));
			else responseStream = new BufferedInputStream(errorStream);
		}
		return responseStream;
	}


	private Response<?> parseResponse() throws IOException
	{
		Response<?> response = mRequest.parseResponse(mResponseStream);
		if(response == null) throw new RuntimeException("Parser returned null response");
		return response;
	}


	private String getBasicAuthToken(String username, String password)
	{
		// Base64.NO_WRAP because of Android <4 problem
		String base64 = Base64.encodeToString((username + ":" + password).getBytes(), Base64.NO_WRAP);
		return "Basic " + base64;
	}
}