content: /*
   * Copyright (C) 2011 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.cjj.volley.toolbox;
  
  import com.cjj.volley.AuthFailureError;
  import com.cjj.volley.Request;
  import com.cjj.volley.Request.Method;
  
  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 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 javax.net.ssl.HttpsURLConnection;
  import javax.net.ssl.SSLSocketFactory;
  
  /**
   * An {@link HttpStack} based on {@link HttpURLConnection}.
   */
  public class HurlStack implements HttpStack {
  
      private static final String HEADER_CONTENT_TYPE = "Content-Type";
  
      /**
       * 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;
  
      public HurlStack() {
          this(null);
      }
  
      /**
       * @param urlRewriter Rewriter to use for request URLs
       */
      public HurlStack(UrlRewriter urlRewriter) {
          this(urlRewriter, null);
      }
  
      /**
       * @param urlRewriter Rewriter to use for request URLs
       * @param sslSocketFactory SSL factory to use for HTTPS connections
       */
      public HurlStack(UrlRewriter urlRewriter, SSLSocketFactory sslSocketFactory) {
          mUrlRewriter = urlRewriter;
          mSslSocketFactory = sslSocketFactory;
      }
  
      @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);
          HttpURLConnection connection = openConnection(parsedUrl, request);
          for (String headerName : map.keySet()) {
              connection.addRequestProperty(headerName, map.get(headerName));
          }
          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 openConnection(URL url, Request<?> request) throws IOException {
          HttpURLConnection connection = createConnection(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:
                  addBodyIfExists(connection, request);
                  connection.setRequestMethod("PATCH");
                  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();
          }
      }
  }
  