forked from jruby/jruby-rack
/
RackFilter.java
156 lines (132 loc) · 5.11 KB
/
RackFilter.java
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/*
* Copyright (c) 2010-2011 Engine Yard, Inc.
* Copyright (c) 2007-2009 Sun Microsystems, Inc.
* This source code is available under the MIT license.
* See the file LICENSE.txt for details.
*/
package org.jruby.rack;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.jruby.rack.servlet.ServletRackContext;
import org.jruby.rack.servlet.ServletRackEnvironment;
import org.jruby.rack.servlet.ServletRackResponseEnvironment;
/**
*
* @author nicksieger
*/
public class RackFilter implements Filter {
private RackContext context;
private RackDispatcher dispatcher;
private boolean convertSlashToIndex = false;
/** Default constructor for servlet container */
public RackFilter() {
}
/** Dependency-injected constructor for testing */
public RackFilter(RackDispatcher dispatcher, RackContext context) {
this.context = context;
this.dispatcher = dispatcher;
}
/** Construct a new dispatcher with the servlet context */
public void init(FilterConfig config) throws ServletException {
this.context = new ServletRackContext(config.getServletContext());
this.dispatcher = new DefaultRackDispatcher(this.context);
this.convertSlashToIndex = shouldConvertSlashToIndex(config.getServletContext());
}
private boolean shouldConvertSlashToIndex(ServletContext context) {
return this.context.getInitParameter("jruby.rack.slash.index") != null
|| context.getServerInfo().contains("jetty"); // JRUBY_RACK-35
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
RackEnvironment env = new ServletRackEnvironment((HttpServletRequest) request);
RackResponseEnvironment responseEnv = new ServletRackResponseEnvironment((HttpServletResponse) response);
HttpServletRequest httpRequest = maybeAppendHtmlToPath(request, env);
HttpServletResponse httpResponse = (HttpServletResponse) response;
ResponseStatusCapture capture = new ResponseStatusCapture(httpResponse);
chain.doFilter(httpRequest, capture);
if (capture.isError()) {
httpResponse.reset();
request.setAttribute(RackEnvironment.DYNAMIC_REQS_ONLY, Boolean.TRUE);
dispatcher.process(env, responseEnv);
}
}
public void destroy() {
}
private static class ResponseStatusCapture extends HttpServletResponseWrapper {
private int status = 200;
public ResponseStatusCapture(HttpServletResponse response) {
super(response);
}
@Override public void sendError(int status, String message) throws IOException {
this.status = status;
}
@Override public void sendError(int status) throws IOException {
this.status = status;
}
@Override public void sendRedirect(String path) throws IOException {
this.status = 302;
super.sendRedirect(path);
}
@Override public void setStatus(int status) {
this.status = status;
if (!isError()) {
super.setStatus(status);
}
}
@Override public void setStatus(int status, String message) {
this.status = status;
if (!isError()) {
super.setStatus(status, message);
}
}
@Override public void flushBuffer() throws IOException {
if (!isError()) {
super.flushBuffer();
}
}
private boolean isError() {
return status >= 400;
}
}
private HttpServletRequest maybeAppendHtmlToPath(ServletRequest request, RackEnvironment env) {
HttpServletRequest httpRequest = (HttpServletRequest) request;
String path = env.getPathInfo();
if (path.lastIndexOf('.') <= path.lastIndexOf('/')) {
boolean endsWithSlash = path.endsWith("/");
if (endsWithSlash) {
path += "index";
}
path += ".html";
if ((!endsWithSlash || !convertSlashToIndex) && !resourceExists(path)) {
return httpRequest;
}
final String uri = path;
httpRequest = new HttpServletRequestWrapper(httpRequest) {
@Override
public String getPathInfo() {
return "";
}
@Override
public String getServletPath() {
return uri;
}
@Override
public String getRequestURI() {
return uri;
}
};
}
return httpRequest;
}
private boolean resourceExists(String path) {
try {
return context.getResource(path) != null;
} catch (Exception e) {
return false;
}
}
}