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// Copyright (C) 2015 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.gwtexpui.linker.server.UserAgentRule;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
class RecompileGwtUiFilter implements Filter {
private final boolean gwtuiRecompile =
System.getProperty("gerrit.disable-gwtui-recompile") == null;
private final UserAgentRule rule = new UserAgentRule();
private final Set<String> uaInitialized = new HashSet<>();
private final Path unpackedWar;
private final BazelBuild builder;
private String lastAgent;
private long lastTime;
RecompileGwtUiFilter(BazelBuild builder, Path unpackedWar) {
this.builder = builder;
this.unpackedWar = unpackedWar;
}
@Override
public void doFilter(ServletRequest request, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
String agent = rule.select((HttpServletRequest) request);
if (unpackedWar != null && (gwtuiRecompile || !uaInitialized.contains(agent))) {
BazelBuild.Label label = builder.gwtZipLabel(agent);
File zip = builder.targetPath(label).toFile();
synchronized (this) {
try {
builder.build(label);
} catch (BazelBuild.BuildFailureException e) {
e.display(label.toString(), (HttpServletResponse) res);
return;
}
if (!agent.equals(lastAgent) || lastTime != zip.lastModified()) {
lastAgent = agent;
lastTime = zip.lastModified();
unpack(zip, unpackedWar.toFile());
}
}
uaInitialized.add(agent);
}
chain.doFilter(request, res);
}
@Override
public void init(FilterConfig config) {}
@Override
public void destroy() {}
private static void unpack(File srcwar, File dstwar) throws IOException {
try (ZipFile zf = new ZipFile(srcwar)) {
final Enumeration<? extends ZipEntry> e = zf.entries();
while (e.hasMoreElements()) {
final ZipEntry ze = e.nextElement();
final String name = ze.getName();
if (ze.isDirectory()
|| name.startsWith("WEB-INF/")
|| name.startsWith("META-INF/")
|| name.startsWith("com/google/gerrit/launcher/")
|| name.equals("Main.class")) {
continue;
}
final File rawtmp = new File(dstwar, name);
mkdir(rawtmp.getParentFile());
rawtmp.deleteOnExit();
try (OutputStream rawout = Files.newOutputStream(rawtmp.toPath());
InputStream in = zf.getInputStream(ze)) {
final byte[] buf = new byte[4096];
int n;
while ((n = in.read(buf, 0, buf.length)) > 0) {
rawout.write(buf, 0, n);
}
}
}
}
}
private static void mkdir(File dir) throws IOException {
if (!dir.isDirectory()) {
mkdir(dir.getParentFile());
if (!dir.mkdir()) {
throw new IOException("Cannot mkdir " + dir.getAbsolutePath());
}
dir.deleteOnExit();
}
}
}
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