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// Copyright (C) 2008 The Android Open Source Project
//
// 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 com.google.gerrit.httpd.raw;
import com.google.gerrit.server.config.SitePaths;
import com.google.gwtjsonrpc.server.RPCServletUtils;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.eclipse.jgit.util.IO;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.zip.GZIPOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** Sends static content from the site 's <code>static/</code> subdirectory. */
@SuppressWarnings("serial")
@Singleton
public class StaticServlet extends HttpServlet {
private static final long MAX_AGE = 12 * 60 * 60 * 1000L/* milliseconds */;
private static final String CACHE_CTRL =
"public, max-age=" + (MAX_AGE / 1000L);
private static final HashMap<String, String> MIME_TYPES =
new HashMap<String, String>();
static {
MIME_TYPES.put("html", "text/html");
MIME_TYPES.put("htm", "text/html");
MIME_TYPES.put("js", "application/x-javascript");
MIME_TYPES.put("css", "text/css");
MIME_TYPES.put("rtf", "text/rtf");
MIME_TYPES.put("txt", "text/plain");
MIME_TYPES.put("text", "text/plain");
MIME_TYPES.put("pdf", "application/pdf");
MIME_TYPES.put("jpeg", "image/jpeg");
MIME_TYPES.put("jpg", "image/jpeg");
MIME_TYPES.put("gif", "image/gif");
MIME_TYPES.put("png", "image/png");
MIME_TYPES.put("tiff", "image/tiff");
MIME_TYPES.put("tif", "image/tiff");
MIME_TYPES.put("svg", "image/svg+xml");
}
private static String contentType(final String name) {
final int dot = name.lastIndexOf('.');
final String ext = 0 < dot ? name.substring(dot + 1) : "";
final String type = MIME_TYPES.get(ext);
return type != null ? type : "application/octet-stream";
}
private static byte[] readFile(final File p) throws IOException {
final FileInputStream in = new FileInputStream(p);
try {
final byte[] r = new byte[(int) in.getChannel().size()];
IO.readFully(in, r, 0, r.length);
return r;
} finally {
in.close();
}
}
private static byte[] compress(final byte[] raw) throws IOException {
final ByteArrayOutputStream out = new ByteArrayOutputStream();
final GZIPOutputStream gz = new GZIPOutputStream(out);
gz.write(raw);
gz.finish();
gz.flush();
return out.toByteArray();
}
private final File staticBase;
private final String staticBasePath;
@Inject
StaticServlet(final SitePaths site) {
File f;
try {
f = site.static_dir.getCanonicalFile();
} catch (IOException e) {
f = site.static_dir.getAbsoluteFile();
}
staticBase = f;
staticBasePath = staticBase.getPath() + File.separator;
}
private File local(final HttpServletRequest req) {
final String name = req.getPathInfo();
if (name.length() < 2 || !name.startsWith("/") || isUnreasonableName(name)) {
// Too short to be a valid file name, or doesn't start with
// the path info separator like we expected.
//
return null;
}
final File p = new File(staticBase, name.substring(1));
// Ensure that the requested file is *actually* within the static dir base.
try {
if (!p.getCanonicalFile().getPath().startsWith(staticBasePath))
return null;
} catch (IOException e) {
return null;
}
return p.isFile() ? p : null;
}
private static boolean isUnreasonableName(String name) {
if (name.charAt(name.length() -1) == '/') return true; // no suffix
if (name.indexOf('\\') >= 0) return true; // no windows/dos stlye paths
if (name.startsWith("../")) return true; // no "../etc/passwd"
if (name.contains("/../")) return true; // no "foo/../etc/passwd"
if (name.contains("/./")) return true; // "foo/./foo" is insane to ask
if (name.contains("//")) return true; // windows UNC path can be "//..."
return false; // is a reasonable name
}
@Override
protected long getLastModified(final HttpServletRequest req) {
final File p = local(req);
return p != null ? p.lastModified() : -1;
}
@Override
protected void doGet(final HttpServletRequest req,
final HttpServletResponse rsp) throws IOException {
final File p = local(req);
if (p == null) {
rsp.setStatus(HttpServletResponse.SC_NOT_FOUND);
return;
}
final String type = contentType(p.getName());
final byte[] tosend;
if (!type.equals("application/x-javascript")
&& RPCServletUtils.acceptsGzipEncoding(req)) {
rsp.setHeader("Content-Encoding", "gzip");
tosend = compress(readFile(p));
} else {
tosend = readFile(p);
}
rsp.setHeader("Cache-Control", CACHE_CTRL);
rsp.setDateHeader("Expires", System.currentTimeMillis() + MAX_AGE);
rsp.setDateHeader("Last-Modified", p.lastModified());
rsp.setContentType(type);
rsp.setContentLength(tosend.length);
final OutputStream out = rsp.getOutputStream();
try {
out.write(tosend);
} finally {
out.close();
}
}
}
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