128 lines
4.0 KiB
Java
128 lines
4.0 KiB
Java
// Copyright (C) 2015 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.httpd.raw;
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import com.google.gwtexpui.linker.server.UserAgentRule;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Enumeration;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipFile;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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class RecompileGwtUiFilter implements Filter {
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private final boolean gwtuiRecompile =
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System.getProperty("gerrit.disable-gwtui-recompile") == null;
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private final UserAgentRule rule = new UserAgentRule();
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private final Set<String> uaInitialized = new HashSet<>();
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private final Path unpackedWar;
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private final BazelBuild builder;
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private String lastAgent;
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private long lastTime;
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RecompileGwtUiFilter(BazelBuild builder, Path unpackedWar) {
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this.builder = builder;
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this.unpackedWar = unpackedWar;
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse res, FilterChain chain)
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throws IOException, ServletException {
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String agent = rule.select((HttpServletRequest) request);
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if (unpackedWar != null && (gwtuiRecompile || !uaInitialized.contains(agent))) {
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BazelBuild.Label label = builder.gwtZipLabel(agent);
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File zip = builder.targetPath(label).toFile();
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synchronized (this) {
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try {
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builder.build(label);
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} catch (BazelBuild.BuildFailureException e) {
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e.display(label.toString(), (HttpServletResponse) res);
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return;
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}
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if (!agent.equals(lastAgent) || lastTime != zip.lastModified()) {
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lastAgent = agent;
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lastTime = zip.lastModified();
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unpack(zip, unpackedWar.toFile());
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}
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}
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uaInitialized.add(agent);
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}
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chain.doFilter(request, res);
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}
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@Override
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public void init(FilterConfig config) {}
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@Override
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public void destroy() {}
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private static void unpack(File srcwar, File dstwar) throws IOException {
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try (ZipFile zf = new ZipFile(srcwar)) {
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final Enumeration<? extends ZipEntry> e = zf.entries();
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while (e.hasMoreElements()) {
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final ZipEntry ze = e.nextElement();
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final String name = ze.getName();
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if (ze.isDirectory()
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|| name.startsWith("WEB-INF/")
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|| name.startsWith("META-INF/")
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|| name.startsWith("com/google/gerrit/launcher/")
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|| name.equals("Main.class")) {
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continue;
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}
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final File rawtmp = new File(dstwar, name);
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mkdir(rawtmp.getParentFile());
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rawtmp.deleteOnExit();
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try (OutputStream rawout = Files.newOutputStream(rawtmp.toPath());
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InputStream in = zf.getInputStream(ze)) {
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final byte[] buf = new byte[4096];
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int n;
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while ((n = in.read(buf, 0, buf.length)) > 0) {
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rawout.write(buf, 0, n);
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}
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}
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}
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}
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}
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private static void mkdir(File dir) throws IOException {
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if (!dir.isDirectory()) {
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mkdir(dir.getParentFile());
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if (!dir.mkdir()) {
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throw new IOException("Cannot mkdir " + dir.getAbsolutePath());
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}
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dir.deleteOnExit();
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}
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}
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}
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