io.undertow.servlet.handlers.DefaultServlet Maven / Gradle / Ivy
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* Copyright 2012 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.servlet.handlers;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import javax.servlet.DispatcherType;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import io.undertow.io.IoCallback;
import io.undertow.io.Sender;
import io.undertow.server.HttpHandlers;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.resource.Resource;
import io.undertow.server.handlers.resource.ResourceManager;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.servlet.api.DefaultServletConfig;
import io.undertow.servlet.api.Deployment;
import io.undertow.servlet.spec.HttpServletRequestImpl;
import io.undertow.servlet.spec.ServletContextImpl;
import io.undertow.util.DateUtils;
import io.undertow.util.ETag;
import io.undertow.util.ETagUtils;
import io.undertow.util.Headers;
import io.undertow.util.Methods;
import io.undertow.util.SameThreadExecutor;
/**
* Default servlet responsible for serving up resources. This is both a handler and a servlet. If no filters
* match the current path then the resources will be served up asynchronously using the
* {@link io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)} method,
* otherwise the request is handled as a normal servlet request.
*
* By default we only allow a restricted set of extensions.
*
* todo: this thing needs a lot more work. In particular:
* - caching for blocking requests
* - correct mime type
* - directory listings
* - range/last-modified and other headers to be handled properly
* - head requests
* - and probably heaps of other things
*
* @author Stuart Douglas
*/
public class DefaultServlet extends HttpServlet {
private Deployment deployment;
private DefaultServletConfig config;
private ResourceManager resourceManager;
private List welcomePages;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContextImpl sc = (ServletContextImpl) config.getServletContext();
this.deployment = sc.getDeployment();
DefaultServletConfig defaultServletConfig = deployment.getDeploymentInfo().getDefaultServletConfig();
this.config = defaultServletConfig != null ? defaultServletConfig : new DefaultServletConfig();
this.resourceManager = deployment.getDeploymentInfo().getResourceManager();
this.welcomePages = deployment.getDeploymentInfo().getWelcomePages();
}
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
final String path = getPath(req);
if (!isAllowed(path)) {
resp.sendError(404);
return;
}
final Resource resource = resourceManager.getResource(path);
if (resource == null) {
if (req.getDispatcherType() == DispatcherType.INCLUDE) {
//servlet 9.3
throw new FileNotFoundException(path);
} else {
resp.sendError(404);
}
return;
} else if (resource.isDirectory()) {
handleWelcomePage(req, resp, path);
} else {
serveFileBlocking(req, resp, resource);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/*
* Where a servlet has received a POST request we still require the capability to include static content.
*/
switch (req.getDispatcherType()) {
case INCLUDE:
case FORWARD:
doGet(req, resp);
break;
default:
super.doPost(req, resp);
}
}
private void serveFileBlocking(final HttpServletRequest req, final HttpServletResponse resp, final Resource resource) throws IOException {
final ETag etag = resource.getETag();
final Date lastModified = resource.getLastModified();
if (!ETagUtils.handleIfMatch(req.getHeader(Headers.IF_MATCH_STRING), etag, false) ||
!DateUtils.handleIfUnmodifiedSince(req.getHeader(Headers.IF_UNMODIFIED_SINCE_STRING), lastModified)) {
resp.setStatus(412);
return;
}
if (!ETagUtils.handleIfNoneMatch(req.getHeader(Headers.IF_NONE_MATCH_STRING), etag, true) ||
!DateUtils.handleIfModifiedSince(req.getHeader(Headers.IF_MODIFIED_SINCE_STRING), lastModified)) {
resp.setStatus(304);
return;
}
//todo: handle range requests
//we are going to proceed. Set the appropriate headers
final String contentType = deployment.getServletContext().getMimeType(resource.getName());
if (contentType != null) {
resp.setHeader(Headers.CONTENT_TYPE_STRING, contentType);
} else {
resp.setHeader(Headers.CONTENT_TYPE_STRING, "application/octet-stream");
}
if (lastModified != null) {
resp.setHeader(Headers.LAST_MODIFIED_STRING, resource.getLastModifiedString());
}
if (etag != null) {
resp.setHeader(Headers.ETAG_STRING, etag.toString());
}
try {
//only set the content length if we are using a stream
//if we are using a writer who knows what the length will end up being
Long contentLength = resource.getContentLength();
if (contentLength != null) {
resp.getOutputStream();
resp.setContentLengthLong(contentLength);
}
} catch (IllegalStateException e) {
}
final boolean include = req.getDispatcherType() == DispatcherType.INCLUDE;
if (!req.getMethod().equals(Methods.HEAD_STRING)) {
HttpServerExchange exchange = ServletRequestContext.requireCurrent().getOriginalRequest().getExchange();
resource.serve(exchange.getResponseSender(), exchange, new IoCallback() {
@Override
public void onComplete(final HttpServerExchange exchange, final Sender sender) {
if (!include) {
sender.close();
}
}
@Override
public void onException(final HttpServerExchange exchange, final Sender sender, final IOException exception) {
//not much we can do here, the connection is broken
sender.close();
}
});
}
}
private void handleWelcomePage(final HttpServletRequest req, final HttpServletResponse resp, final String oldPath) throws IOException, ServletException {
String welcomePage = findWelcomeFile(oldPath);
if (welcomePage != null) {
if (!req.getRequestURI().endsWith("/")) {
redirectWithTrailingSlash(req, resp);
} else {
redirect(req, welcomePage);
}
} else {
final String pathWithTraingSlash = oldPath.endsWith("/") ? oldPath : oldPath + "/";
String path = findWelcomeServlet(pathWithTraingSlash);
if (path != null) {
if (!req.getRequestURI().endsWith("/")) {
redirectWithTrailingSlash(req, resp);
} else {
redirect(req, path);
}
} else {
resp.sendError(404);
}
}
}
private void redirectWithTrailingSlash(final HttpServletRequest req, final HttpServletResponse resp) throws IOException {
if (req.getQueryString() != null) {
resp.sendRedirect(req.getRequestURI() + "/?" + req.getQueryString());
} else {
resp.sendRedirect(req.getRequestURI() + "/");
}
}
private void redirect(final HttpServletRequest req, final String pathAddition) {
//we need to redirect in a manner that is indistinguishable from a a direct request
//we can't just use a forward, as these do not have security applied, and
//also the filters that have been applied to the request would be different.
//instead we get the exchange and do a dispatch, and then redirect. This basically acts like
//two seperate servlet requests
final HttpServletRequestImpl requestImpl = ServletRequestContext.requireCurrent().getOriginalRequest();
final HttpServerExchange exchange = requestImpl.getExchange();
if (!exchange.isRequestChannelAvailable()) {
throw UndertowServletMessages.MESSAGES.responseAlreadyCommited();
}
exchange.dispatch(SameThreadExecutor.INSTANCE, new Runnable() {
@Override
public void run() {
String path = pathAddition;
if (!exchange.getRelativePath().endsWith("/")) {
path = "/" + path;
}
exchange.getResponseHeaders().clear();
exchange.setResponseCode(200);
exchange.setRelativePath(exchange.getRelativePath() + path);
exchange.setRequestPath(exchange.getRequestPath() + path);
exchange.setRequestURI(exchange.getRequestURI() + path);
HttpHandlers.executeRootHandler(requestImpl.getServletContext().getDeployment().getHandler(), exchange, false);
}
});
}
private String findWelcomeFile(final String path) {
String realPath = path.endsWith("/") ? path : path + "/";
for (String i : welcomePages) {
try {
Resource resource = resourceManager.getResource(realPath + i);
if (resource != null) {
return i;
}
} catch (IOException e) {
}
}
return null;
}
private String findWelcomeServlet(final String path) {
for (String i : welcomePages) {
final ServletPathMatch handler = deployment.getServletPaths().getServletHandlerByPath(path + i);
if (handler != null && !handler.getManagedServlet().getServletInfo().getServletClass().equals(DefaultServlet.class)) {
return i;
}
}
return null;
}
private String getPath(final HttpServletRequest request) {
if (request.getDispatcherType() == DispatcherType.INCLUDE && request.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI) != null) {
String result = (String) request.getAttribute(RequestDispatcher.INCLUDE_PATH_INFO);
if (result == null) {
result = (String) request.getAttribute(RequestDispatcher.INCLUDE_SERVLET_PATH);
}
if (result == null || result.equals("")) {
result = "/";
}
return result;
} else {
String result = request.getPathInfo();
if (result == null) {
result = request.getServletPath();
}
if ((result == null) || (result.equals(""))) {
result = "/";
}
return result;
}
}
private boolean isAllowed(String path) {
if (!path.isEmpty()) {
if (path.startsWith("/META-INF") ||
path.startsWith("META-INF") ||
path.startsWith("/WEB-INF") ||
path.startsWith("WEB-INF")) {
return false;
}
}
int pos = path.lastIndexOf('/');
final String lastSegment;
if (pos == -1) {
lastSegment = path;
} else {
lastSegment = path.substring(pos + 1);
}
if (lastSegment.isEmpty()) {
return true;
}
int ext = lastSegment.lastIndexOf('.');
if (ext == -1) {
//no extension
return true;
}
final String extension = lastSegment.substring(ext + 1, lastSegment.length());
if (config.isDefaultAllowed()) {
return !config.getDisallowed().contains(extension);
} else {
return config.getAllowed().contains(extension);
}
}
}
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