ABP/Android Process chunked requests

src/sunlabs/brazil/util/http/HttpRequest.java

 /*
  * HttpRequest.java
  *
  * Brazil project web application toolkit,
  * export version: 2.3 
  * Copyright (c) 1999-2007 Sun Microsystems, Inc.
  *
  * Sun Public License Notice
  *
  * The contents of this file are subject to the Sun Public License Version 
  * 1.0 (the "License"). You may not use this file except in compliance with 
  * the License. A copy of the License is included as the file "license.terms",
  * and also available at http://www.sun.com/
  * 
  * The Original Code is from:
  *    Brazil project web application toolkit release 2.3.
  * The Initial Developer of the Original Code is: cstevens.
  * Portions created by cstevens are Copyright (C) Sun Microsystems, Inc.
  * All Rights Reserved.
  * 
  * Contributor(s): cstevens, drach, suhler.
  *
  * Version:  2.7
  * Created by cstevens on 99/09/15
  * Last modified by suhler on 07/03/26 13:53:18
  *
  * Version Histories:
  *
+ * 13/04/09-12:44:12 (andrey@adblockplus.org)
+ *   implemented proxying chunked request body
+ *
  * 2.7 07/03/26-13:53:18 (suhler)
  *   doc updates
  *
  * 2.6 07/03/26-13:44:17 (suhler)
  *   add sample main() to act as a simple "wget"
  *
  * 2.5 04/11/30-15:19:40 (suhler)
  *   fixed sccs version string
  *
  * 2.4 03/08/01-16:18:01 (suhler)
@@ skipping 433 matching lines @@
      */
     public static boolean displayAllHeaders = false;
 
     ByteArrayOutputStream postData;
 
     String uri;
     String connectionHeader;
 
     HttpInputStream in;
     InputStream under;
+    HttpInputStream cs;
 
     /**
      * The status line from the HTTP response.  This field is not valid until
      * after <code>connect</code> has been called and the HTTP response has
      * been read.
      */
     public String status;
 
     /**
      * The headers that were present in the HTTP response.  This field is
@@ skipping 171 matching lines @@
     public OutputStream
     getOutputStream()
         throws IOException
     {
         if (postData == null) {
             postData = new ByteArrayOutputStream();
         }
         return postData;
     }
 
+    public void
+    setHttpInputStream(HttpInputStream cs)
+    {
+        this.cs = cs;
+    }
+
     /**
      * Connect to the target host (or proxy), send the request, and read the
      * response headers.  Any setup routines must be called before the call
      * to this method, and routines to examine the result must be called after
      * this method.
      * <p>
      *
      * @throws  UnknownHostException
      *          if the target host (or proxy) could not be contacted.
      *
@@ skipping 179 matching lines @@
 
         PrintStream p = new PrintStream(hs.out);
         p.print(method + " " + uri + " " + version + "\r\n");
         requestHeaders.print(p);
         p.print("\r\n");
 
         if (postData != null) {
             postData.writeTo(p);
             postData = null;                    // Release memory.
         }
+        
+        // Pass any data left in client stream (in case of chunked request content)
+        String encoding = requestHeaders.get("Transfer-Encoding", "");
+        if (encoding != null && encoding.equals("chunked") && cs != null)

[Felix Dahlke, 2013/04/09 09:16:48]

You could just do '"chunked".equals(encoding)' to avoid the null check.

[Andrey Novikov, 2013/04/10 08:30:30]

Done.

+        {
+                byte[] buf = new byte[4096];

[Felix Dahlke, 2013/04/09 09:16:48]

Indentation is off here

+                int bytesLeft = -1;
+                while (true)
+                {
+                        // Read chunk size
+                        if (bytesLeft <= 0)
+                        {
+                                bytesLeft = getChunkSize(cs);
+                                // Output chunk size
+                                p.print(Integer.toHexString(bytesLeft) + "\r\n");
+                        }
+                        if (bytesLeft == 0)
+                                break;
+                        // Pass chunk data
+                        int count = cs.read(buf, 0, Math.min(bytesLeft, buf.length));
+                        if (count < 0)
+                        {
+                                // This shouldn't occur - no final zero chunk
+                                bytesLeft = -1;
+                                break;
+                        }
+                        p.write(buf, 0, count);
+                        bytesLeft -= count;
+                        if (bytesLeft == 0)
+                                p.print("\r\n");
+                }
+                // Pass the trailer
+                if (bytesLeft == 0)
+                {
+                        while (true)
+                        {
+                                String line = cs.readLine(LINE_LIMIT);
+                                if (line == null)
+                                        break;
+                                p.print(line + "\r\n");
+                                if (line.length() == 0)
+                                        break;
+                        }
+                }
+        }
+        
         p.flush();
     }
 
+    /*
+     * Copied (with some amendmends) from UnchunkingInputStream / andrey@adblockplus.org
+     */
+    private int
+    getChunkSize(HttpInputStream is)
+        throws IOException
+    {
+        /*
+        * Although HTTP/1.1 chunking spec says that there is one "\r\n"
+        * between chunks, some servers (for example, maps.yahoo.com) 
+        * send more than one blank line between chunks.  So, read and skip
+        * all the blank lines seen between chunks.
+        */
+
+        int bytesLeft = 0;
+        String line;
+        do {
+                // Sanity check: limit chars when expecting a chunk size.
+                line = is.readLine(HttpRequest.LINE_LIMIT);
+        } while ((line != null) && (line.length() == 0));

[Felix Dahlke, 2013/04/09 09:16:48]

Here's a shorter alternative: while("".equals(line))

[Andrey Novikov, 2013/04/10 08:30:30]

This was copied from another part of Brazil, I'll keep it as is for consistency.

+
+        try {
+                bytesLeft = Integer.parseInt(line.trim(), 16);
+        } catch (Exception e) {
+                throw new IOException("malformed chunk");
+        }
+        return bytesLeft;
+    }
+
     void
     readStatusLine()
         throws IOException
     {
         while (true) {
             status = in.readLine(LINE_LIMIT);
             if (status == null) {
                 throw new EOFException();
             }
             if (status.startsWith("HTTP/1.1 100")
@@ skipping 877 matching lines @@
             return "(null)";
         }
         StringBuffer sb = new StringBuffer();
         for (int i = 0; i < idle.size(); i++) {
             HttpSocket hs = (HttpSocket) idle.elementAt(i);
             sb.append(hs.toString() + ", ");
         }
         return sb.toString();
     }
 }