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/*******************************************************************************
* Copyright (c) 2005-2007 Cognos Incorporated, IBM Corporation 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:
* Cognos Incorporated - initial API and implementation
* IBM Corporation - bug fixes and enhancements
*******************************************************************************/
package org.eclipse.equinox.http.servlet.internal;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.security.*;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.osgi.service.http.HttpContext;
public class ResourceRegistration extends Registration {
private static final String LAST_MODIFIED = "Last-Modified"; //$NON-NLS-1$
private static final String IF_MODIFIED_SINCE = "If-Modified-Since"; //$NON-NLS-1$
private static final String IF_NONE_MATCH = "If-None-Match"; //$NON-NLS-1$
private static final String ETAG = "ETag"; //$NON-NLS-1$
private String internalName;
HttpContext httpContext;
ServletContext servletContext;
private AccessControlContext acc;
public ResourceRegistration(String internalName, HttpContext context, ServletContext servletContext, AccessControlContext acc) {
this.internalName = internalName;
if (internalName.equals("/")) { //$NON-NLS-1$
this.internalName = ""; //$NON-NLS-1$
}
this.httpContext = context;
this.servletContext = servletContext;
this.acc = acc;
}
public boolean handleRequest(HttpServletRequest req, final HttpServletResponse resp, String alias) throws IOException {
if (httpContext.handleSecurity(req, resp)) {
String method = req.getMethod();
if (method.equals("GET") || method.equals("POST") || method.equals("HEAD")) { //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$
String pathInfo = HttpServletRequestAdaptor.getDispatchPathInfo(req);
int aliasLength = alias.equals("/") ? 0 : alias.length(); //$NON-NLS-1$
String resourcePath = internalName + pathInfo.substring(aliasLength);
URL testURL = httpContext.getResource(resourcePath);
if (testURL == null || resourcePath.endsWith("/")) { //$NON-NLS-1$
return false;
}
return writeResource(req, resp, resourcePath);
}
resp.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
}
return true;
}
private boolean writeResource(final HttpServletRequest req, final HttpServletResponse resp, final String resourcePath) throws IOException {
Boolean result = Boolean.TRUE;
try {
result = (Boolean) AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws Exception {
URL url = httpContext.getResource(resourcePath);
if (url == null)
return Boolean.FALSE;
URLConnection connection = url.openConnection();
long lastModified = connection.getLastModified();
int contentLength = connection.getContentLength();
// check to ensure that we're dealing with a real resource and in particular not a directory
if (contentLength <= 0)
return Boolean.FALSE;
String etag = null;
if (lastModified != -1 && contentLength != -1)
etag = "W/\"" + contentLength + "-" + lastModified + "\""; //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
// Check for cache revalidation.
// We should prefer ETag validation as the guarantees are stronger and all HTTP 1.1 clients should be using it
String ifNoneMatch = req.getHeader(IF_NONE_MATCH);
if (ifNoneMatch != null && etag != null && ifNoneMatch.indexOf(etag) != -1) {
resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
return Boolean.TRUE;
} else {
long ifModifiedSince = req.getDateHeader(IF_MODIFIED_SINCE);
// for purposes of comparison we add 999 to ifModifiedSince since the fidelity
// of the IMS header generally doesn't include milli-seconds
if (ifModifiedSince > -1 && lastModified > 0 && lastModified <= (ifModifiedSince + 999)) {
resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
return Boolean.TRUE;
}
}
// return the full contents regularly
if (contentLength != -1)
resp.setContentLength(contentLength);
String contentType = httpContext.getMimeType(resourcePath);
if (contentType == null)
contentType = servletContext.getMimeType(resourcePath);
if (contentType != null)
resp.setContentType(contentType);
if (lastModified > 0)
resp.setDateHeader(LAST_MODIFIED, lastModified);
if (etag != null)
resp.setHeader(ETAG, etag);
try {
OutputStream os = resp.getOutputStream();
int writtenContentLength = writeResourceToOutputStream(connection, os);
if (contentLength == -1 || contentLength != writtenContentLength)
resp.setContentLength(writtenContentLength);
} catch (IllegalStateException e) { // can occur if the response output is already open as a Writer
Writer writer = resp.getWriter();
writeResourceToWriter(connection, writer);
// Since ContentLength is a measure of the number of bytes contained in the body
// of a message when we use a Writer we lose control of the exact byte count and
// defer the problem to the Servlet Engine's Writer implementation.
}
return Boolean.TRUE;
}
}, acc);
} catch (PrivilegedActionException e) {
throw (IOException) e.getException();
}
return result.booleanValue();
}
int writeResourceToOutputStream(URLConnection connection, OutputStream os) throws IOException {
InputStream is = connection.getInputStream();
try {
byte[] buffer = new byte[8192];
int bytesRead = is.read(buffer);
int writtenContentLength = 0;
while (bytesRead != -1) {
os.write(buffer, 0, bytesRead);
writtenContentLength += bytesRead;
bytesRead = is.read(buffer);
}
return writtenContentLength;
} finally {
if (is != null)
is.close();
}
}
void writeResourceToWriter(URLConnection connection, Writer writer) throws IOException {
InputStream is = connection.getInputStream();
try {
Reader reader = new InputStreamReader(connection.getInputStream());
try {
char[] buffer = new char[8192];
int charsRead = reader.read(buffer);
while (charsRead != -1) {
writer.write(buffer, 0, charsRead);
charsRead = reader.read(buffer);
}
} finally {
if (reader != null) {
reader.close(); // will also close input stream
is = null;
}
}
} finally {
if (is != null)
is.close();
}
}
}
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