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/*******************************************************************************
* Copyright (c) 2009, Cloudsmith Inc and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.p2.testserver.servlets;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URLConnection;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* The FileMolester will keep a certain amount of the file from the beginning, and return
* garbage/gibberish for the rest of the file's content. The garbage is produced by shifting every
* byte 1 bit to the left.
*
* The idea for keeping some percentage is to support keeping xml headers / doctype etc.
*/
public class FileMolester extends BasicResourceDelivery {
int keepLength;
/**
* Create a file molester that turns content into gibberish.
*
* @param theAlias the path this servlet is registered under
* @param thePath the path to use as root for the alias
* @param keepLength - how many bytes in the beginning that will be unmolested
*/
public FileMolester(String theAlias, URI thePath, int keepLength) {
super(theAlias, thePath);
if (keepLength < 0)
throw new IllegalArgumentException("keepLength must be >= 0 - was:" + Integer.valueOf(keepLength)); //$NON-NLS-1$
this.keepLength = keepLength;
}
private static final long serialVersionUID = 1L;
protected void deliver(URLConnection conn, InputStream in, String filename, HttpServletRequest request, HttpServletResponse response) throws IOException {
// molest all files
doMolest(conn, in, filename, request, response);
}
protected void doMolest(URLConnection conn, InputStream in, String filename, HttpServletRequest request, HttpServletResponse response) throws IOException {
int contentlength = conn.getContentLength();
if (contentlength >= 0) {
response.setContentLength(contentlength);
String mimeType = computeMimeType(filename, conn);
response.setContentType(mimeType);
// We want to use a writer if we are sending text
if (mimeType.startsWith("text/")) //$NON-NLS-1$
{
PrintWriter writer = response.getWriter();
writer.flush(); /* write the headers and unbuffer the output */
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
char buffer[] = new char[4096];
int read;
int written = 0;
while ((read = reader.read(buffer, 0, buffer.length)) != -1) {
if (written + read > keepLength)
molest(buffer, written, read);
writer.write(buffer, 0, read);
written += read;
}
} else {
ServletOutputStream out = response.getOutputStream();
out.flush(); /* write the headers and unbuffer the output */
byte buffer[] = new byte[4096];
int read;
int written = 0;
while ((read = in.read(buffer, 0, buffer.length)) != -1) {
if (written + read > keepLength)
molest(buffer, written, read);
out.write(buffer, 0, read);
written += read;
}
}
}
}
/** Molest a char buffer */
private void molest(char[] buffer, int written, int read) {
int start = keepLength - written;
if (start > read)
return;
for (int i = start < 0 ? 0 : start; i < read; i++)
buffer[i] = (char) (buffer[i] << 1);
}
/** Molest a byte buffer */
private void molest(byte[] buffer, int written, int read) {
int start = keepLength - written;
if (start > read)
return;
for (int i = start < 0 ? 0 : start; i < read; i++)
buffer[i] = (byte) (buffer[i] << 1);
}
}
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