Merged V2.0 to HEAD

svn merge svn://svn.alfresco.com:3691/alfresco/BRANCHES/V2.0@5118 svn://svn.alfresco.com:3691/alfresco/BRANCHES/V2.0@5119 .
   - OpenSearch Proxy
   svn merge svn://svn.alfresco.com:3691/alfresco/BRANCHES/V2.0@5121 svn://svn.alfresco.com:3691/alfresco/BRANCHES/V2.0@5122 .
   - Extract sample OpenSearch engine registrations into extension config file.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5125 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/servlet/HTTPProxy.java

@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.alfresco.web.app.servlet;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+
+import javax.servlet.http.HttpServletResponse;
+
+
+/**
+ * Simple server-side HTTP Request / Response
+ * 
+ * @author davidc
+ */
+public class HTTPProxy
+{
+    protected URL url;
+    protected HttpServletResponse response;
+
+    
+    /**
+     * Construct
+     * 
+     * @param requestUrl  url to request
+     * @param response  response to write request back to
+     * @throws MalformedURLException
+     */
+    public HTTPProxy(String requestUrl, HttpServletResponse response)
+        throws MalformedURLException
+    {
+        this.url = new URL(requestUrl);
+        this.response = response;
+    }
+
+    /**
+     * Perform request
+     *  
+     * @throws IOException
+     */
+    public void service()
+        throws IOException
+    {
+        URLConnection connection = url.openConnection();
+        initialiseResponse(connection);
+        InputStream input = connection.getInputStream();
+        OutputStream output = response.getOutputStream();
+        try
+        {
+            writeResponse(input, output);
+        }
+        finally
+        {
+            try
+            {
+                if (input != null)
+                {
+                    input.close();
+                }
+                if (output != null)
+                {
+                    output.flush();
+                    output.close();
+                }
+            }
+            catch(IOException e)
+            {
+            }
+        }
+    }
+    
+    /**
+     * Initialise response
+     * 
+     * @param urlConnection  url connection
+     */
+    protected void initialiseResponse(URLConnection urlConnection)
+    {
+        String type = urlConnection.getContentType();
+        if (type != null)
+        {
+            int encodingIdx = type.lastIndexOf("charset=");
+            if (encodingIdx == -1)
+            {
+                String encoding = urlConnection.getContentEncoding();
+                if (encoding != null && encoding.length() > 0)
+                {
+                    type += ";charset=" + encoding;
+                }
+            }
+            
+            response.setContentType(type);
+        }
+    }
+    
+    /**
+     * Write response
+     * 
+     * @param input  input stream of request
+     * @param output  output stream of response
+     * @throws IOException
+     */
+    protected void writeResponse(InputStream input, OutputStream output)
+        throws IOException
+    {
+        byte[] buffer = new byte[1024];
+        int read = input.read(buffer);
+        while (read != -1)
+        {
+            output.write(buffer, 0, read);
+            read = input.read(buffer);
+        }
+    }
+    
+}