OkHttpStack

OkHttpStack

package com.brd.igoshow.common;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.TimeUnit;

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

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ProtocolVersion;
import org.apache.http.StatusLine;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.message.BasicStatusLine;

import android.util.Log;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Request.Method;
import com.android.volley.toolbox.HttpStack;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.OkUrlFactory;

public class OkHttpStack implements HttpStack {

	 private static final String HEADER_CONTENT_TYPE = "Content-Type";
	private static final String TAG = "OkHttpStack";

	    /**
	     * An interface for transforming URLs before use.
	     */
	    public interface UrlRewriter {
	        /**
	         * Returns a URL to use instead of the provided one, or null to indicate
	         * this URL should not be used at all.
	         */
	        public String rewriteUrl(String originalUrl);
	    }

	    private final UrlRewriter mUrlRewriter;
	    private final SSLSocketFactory mSslSocketFactory;
	    
	    private OkHttpClient mClient;

	    public OkHttpStack(OkHttpClient client) {
	        this(null, client);
	    }

	    /**
	     * @param urlRewriter Rewriter to use for request URLs
	     */
	    public OkHttpStack(UrlRewriter urlRewriter, OkHttpClient client) {
	        this(urlRewriter, null, client);
	    }

	    /**
	     * @param urlRewriter Rewriter to use for request URLs
	     * @param sslSocketFactory SSL factory to use for HTTPS connections
	     */
	    public OkHttpStack(UrlRewriter urlRewriter, SSLSocketFactory sslSocketFactory, OkHttpClient client) {
	        mUrlRewriter = urlRewriter;
	        mSslSocketFactory = sslSocketFactory;
	        mClient = client;
	        mClient.setConnectTimeout(60, TimeUnit.SECONDS);
	        mClient.setWriteTimeout(15, TimeUnit.SECONDS);
	    }

	    @Override
	    public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
	            throws IOException, AuthFailureError {
	        String url = request.getUrl();
	        HashMap<String, String> map = new HashMap<String, String>();
	        map.putAll(request.getHeaders());
	        map.putAll(additionalHeaders);
	        if (mUrlRewriter != null) {
	            String rewritten = mUrlRewriter.rewriteUrl(url);
	            if (rewritten == null) {
	                throw new IOException("URL blocked by rewriter: " + url);
	            }
	            url = rewritten;
	        }
	        URL parsedUrl = new URL(url);
	        OkUrlFactory okFactory = new OkUrlFactory(mClient);
	        HttpURLConnection connection = openOkHttpURLConnection(okFactory, parsedUrl, request);
	        for (String headerName : map.keySet()) {
	            connection.addRequestProperty(headerName, map.get(headerName));
	        }
	        Log.i(TAG, "Request url = " + connection.getURL().toString());
	        setConnectionParametersForRequest(connection, request);
	        // Initialize HttpResponse with data from the HttpURLConnection.
	        ProtocolVersion protocolVersion = new ProtocolVersion("HTTP", 1, 1);
	        int responseCode = connection.getResponseCode();
	        if (responseCode == -1) {
	            // -1 is returned by getResponseCode() if the response code could not be retrieved.
	            // Signal to the caller that something was wrong with the connection.
	            throw new IOException("Could not retrieve response code from HttpUrlConnection.");
	        }
	        StatusLine responseStatus = new BasicStatusLine(protocolVersion,
	                connection.getResponseCode(), connection.getResponseMessage());
	        BasicHttpResponse response = new BasicHttpResponse(responseStatus);
	        response.setEntity(entityFromConnection(connection));
	        for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
	            if (header.getKey() != null) {
	                Header h = new BasicHeader(header.getKey(), header.getValue().get(0));
	                response.addHeader(h);
	            }
	        }
	        return response;
	    }

	    /**
	     * Initializes an {@link HttpEntity} from the given {@link HttpURLConnection}.
	     * @param connection
	     * @return an HttpEntity populated with data from <code>connection</code>.
	     */
	    private static HttpEntity entityFromConnection(HttpURLConnection connection) {
	        BasicHttpEntity entity = new BasicHttpEntity();
	        InputStream inputStream;
	        try {
	            inputStream = connection.getInputStream();
	        } catch (IOException ioe) {
	            inputStream = connection.getErrorStream();
	        }
	        entity.setContent(inputStream);
	        entity.setContentLength(connection.getContentLength());
	        entity.setContentEncoding(connection.getContentEncoding());
	        entity.setContentType(connection.getContentType());
	        return entity;
	    }

	    /**
	     * Create an {@link HttpURLConnection} for the specified {@code url}.
	     */
	    protected HttpURLConnection createConnection(URL url) throws IOException {
	        return (HttpURLConnection) url.openConnection();
	    }

	    /**
	     * Opens an {@link HttpURLConnection} with parameters.
	     * @param url
	     * @return an open connection
	     * @throws IOException
	     */
	    private HttpURLConnection openOkHttpURLConnection(OkUrlFactory factory, URL url, Request<?> request) throws IOException {
//	        HttpURLConnection connection = createConnection(url);
	    	HttpURLConnection connection = factory.open(url);
	        int timeoutMs = request.getTimeoutMs();
	        connection.setConnectTimeout(timeoutMs);
	        connection.setReadTimeout(timeoutMs);
	        connection.setUseCaches(false);
	        connection.setDoInput(true);

	        // use caller-provided custom SslSocketFactory, if any, for HTTPS
	        if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
	            ((HttpsURLConnection)connection).setSSLSocketFactory(mSslSocketFactory);
	        }

	        return connection;
	    }

	    @SuppressWarnings("deprecation")
	    /* package */ static void setConnectionParametersForRequest(HttpURLConnection connection,
	            Request<?> request) throws IOException, AuthFailureError {
	        switch (request.getMethod()) {
	            case Method.DEPRECATED_GET_OR_POST:
	                // This is the deprecated way that needs to be handled for backwards compatibility.
	                // If the request's post body is null, then the assumption is that the request is
	                // GET.  Otherwise, it is assumed that the request is a POST.
	                byte[] postBody = request.getPostBody();
	                if (postBody != null) {
	                    // Prepare output. There is no need to set Content-Length explicitly,
	                    // since this is handled by HttpURLConnection using the size of the prepared
	                    // output stream.
	                    connection.setDoOutput(true);
	                    connection.setRequestMethod("POST");
	                    connection.addRequestProperty(HEADER_CONTENT_TYPE,
	                            request.getPostBodyContentType());
	                    DataOutputStream out = new DataOutputStream(connection.getOutputStream());
	                    out.write(postBody);
	                    out.close();
	                }
	                break;
	            case Method.GET:
	                // Not necessary to set the request method because connection defaults to GET but
	                // being explicit here.
	                connection.setRequestMethod("GET");
	                break;
	            case Method.DELETE:
	                connection.setRequestMethod("DELETE");
	                break;
	            case Method.POST:
	                connection.setRequestMethod("POST");
	                addBodyIfExists(connection, request);
	                break;
	            case Method.PUT:
	                connection.setRequestMethod("PUT");
	                addBodyIfExists(connection, request);
	                break;
	            case Method.HEAD:
	                connection.setRequestMethod("HEAD");
	                break;
	            case Method.OPTIONS:
	                connection.setRequestMethod("OPTIONS");
	                break;
	            case Method.TRACE:
	                connection.setRequestMethod("TRACE");
	                break;
	            case Method.PATCH:
	                connection.setRequestMethod("PATCH");
	                addBodyIfExists(connection, request);
	                break;
	            default:
	                throw new IllegalStateException("Unknown method type.");
	        }
	    }

	    private static void addBodyIfExists(HttpURLConnection connection, Request<?> request)
	            throws IOException, AuthFailureError {
	        byte[] body = request.getBody();
	        if (body != null) {
	            connection.setDoOutput(true);
	            connection.addRequestProperty(HEADER_CONTENT_TYPE, request.getBodyContentType());
	            DataOutputStream out = new DataOutputStream(connection.getOutputStream());
	            out.write(body);
	            out.close();
	        }
	    }
}