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com.google.gerrit.httpd.gitweb.GitwebServlet Maven / Gradle / Ivy
// Copyright (C) 2009 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.
// CGI environment and execution management portions are:
//
// ========================================================================
// Copyright (c) 2006-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package com.google.gerrit.httpd.gitweb;
import static java.nio.charset.StandardCharsets.ISO_8859_1;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.PageLinks;
import com.google.gerrit.entities.Project;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.Url;
import com.google.gerrit.server.AnonymousUser;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.config.AllProjectsName;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.GitwebCgiConfig;
import com.google.gerrit.server.config.GitwebConfig;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.git.DelegateRepository;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.permissions.ProjectPermission;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.ssh.SshInfo;
import com.google.gerrit.util.http.CacheHeaders;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Singleton;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.Repository;
/** Invokes {@code gitweb.cgi} for the project given in {@code p}. */
@Singleton
class GitwebServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final String PROJECT_LIST_ACTION = "project_list";
private static final int BUFFER_SIZE = 8192;
private final Set deniedActions;
private final Path gitwebCgi;
private final URI gitwebUrl;
private final GitRepositoryManager repoManager;
private final ProjectCache projectCache;
private final PermissionBackend permissionBackend;
private final Provider anonymousUserProvider;
private final Provider userProvider;
private final EnvList _env;
@SuppressWarnings("CheckReturnValue")
@Inject
GitwebServlet(
GitRepositoryManager repoManager,
ProjectCache projectCache,
PermissionBackend permissionBackend,
Provider userProvider,
SitePaths site,
@GerritServerConfig Config cfg,
SshInfo sshInfo,
Provider anonymousUserProvider,
GitwebConfig gitwebConfig,
GitwebCgiConfig gitwebCgiConfig,
AllProjectsName allProjects)
throws IOException {
this.repoManager = repoManager;
this.projectCache = projectCache;
this.permissionBackend = permissionBackend;
this.anonymousUserProvider = anonymousUserProvider;
this.userProvider = userProvider;
this.gitwebCgi = gitwebCgiConfig.getGitwebCgi();
this.deniedActions = new HashSet<>();
// ensure that Gitweb works on supported repository type by checking All-Projects project
getProjectRoot(allProjects);
final String url = gitwebConfig.getUrl();
if (url != null && !url.equals("gitweb")) {
URI uri = null;
try {
uri = new URI(url);
} catch (URISyntaxException e) {
logger.atSevere().log("Invalid gitweb.url: %s", url);
}
gitwebUrl = uri;
} else {
gitwebUrl = null;
}
deniedActions.add("forks");
deniedActions.add("opml");
deniedActions.add("project_index");
_env = new EnvList();
makeSiteConfig(site, cfg, sshInfo);
if (!_env.envMap.containsKey("SystemRoot")) {
String os = System.getProperty("os.name");
if (os != null && os.toLowerCase(Locale.US).contains("windows")) {
String sysroot = System.getenv("SystemRoot");
if (sysroot == null || sysroot.isEmpty()) {
sysroot = "C:\\WINDOWS";
}
_env.set("SystemRoot", sysroot);
}
}
if (!_env.envMap.containsKey("PATH")) {
_env.set("PATH", System.getenv("PATH"));
}
}
private void makeSiteConfig(SitePaths site, Config cfg, SshInfo sshInfo) throws IOException {
if (!Files.exists(site.tmp_dir)) {
Files.createDirectories(site.tmp_dir);
}
Path myconf = Files.createTempFile(site.tmp_dir, "gitweb_config", ".perl");
// To make our configuration file only readable or writable by us; this reduces the chances of
// someone tampering with the file.
File myconfFile = myconf.toFile();
myconfFile.setWritable(false, false /* all */);
myconfFile.setReadable(false, false /* all */);
myconfFile.setExecutable(false, false /* all */);
myconfFile.setWritable(true, true /* owner only */);
myconfFile.setReadable(true, true /* owner only */);
myconfFile.deleteOnExit();
_env.set("GIT_DIR", ".");
_env.set("GITWEB_CONFIG", myconf.toAbsolutePath().toString());
try (PrintWriter p = new PrintWriter(Files.newBufferedWriter(myconf, UTF_8))) {
p.print("# Autogenerated by Gerrit Code Review \n");
p.print("# DO NOT EDIT\n");
p.print("\n");
// We are mounted at the same level in the context as the main
// UI, so we can include the same header and footer scheme.
//
Path hdr = site.site_header;
if (Files.isRegularFile(hdr)) {
p.print("$site_header = " + quoteForPerl(hdr) + ";\n");
}
Path ftr = site.site_footer;
if (Files.isRegularFile(ftr)) {
p.print("$site_footer = " + quoteForPerl(ftr) + ";\n");
}
// Top level should return to Gerrit's UI.
//
p.print("$home_link = $ENV{'GERRIT_CONTEXT_PATH'};\n");
p.print("$home_link_str = 'Code Review';\n");
p.print("$favicon = 'favicon.ico';\n");
p.print("$logo = 'gitweb-logo.png';\n");
p.print("$javascript = 'gitweb.js';\n");
p.print("@stylesheets = ('gitweb-default.css');\n");
Path css = site.site_css;
if (Files.isRegularFile(css)) {
p.print("push @stylesheets, 'gitweb-site.css';\n");
}
// Try to make the title match Gerrit's normal window title
// scheme of host followed by 'Code Review'.
//
p.print("$site_name = $home_link_str;\n");
p.print("$site_name = qq{$1 $site_name} if ");
p.print("$ENV{'SERVER_NAME'} =~ m,^([^.]+(?:\\.[^.]+)?)(?:\\.|$),;\n");
// Assume by default that XSS is a problem, and try to prevent it.
//
p.print("$prevent_xss = 1;\n");
// Generate URLs using smart http://
//
p.print("{\n");
p.print(" my $secure = $ENV{'HTTPS'} =~ /^ON$/i;\n");
p.print(" my $http_url = $secure ? 'https://' : 'http://';\n");
p.print(" $http_url .= qq{$ENV{'GERRIT_USER_NAME'}@}\n");
p.print(" unless $ENV{'GERRIT_ANONYMOUS_READ'};\n");
p.print(" $http_url .= $ENV{'SERVER_NAME'};\n");
p.print(" $http_url .= qq{:$ENV{'SERVER_PORT'}}\n");
p.print(" if (( $secure && $ENV{'SERVER_PORT'} != 443)\n");
p.print(" || (!$secure && $ENV{'SERVER_PORT'} != 80)\n");
p.print(" );\n");
p.print(" my $context = $ENV{'GERRIT_CONTEXT_PATH'};\n");
p.print(" chop($context);\n");
p.print(" $http_url .= qq{$context};\n");
p.print(" $http_url .= qq{/a}\n");
p.print(" unless $ENV{'GERRIT_ANONYMOUS_READ'};\n");
p.print(" push @git_base_url_list, $http_url;\n");
p.print("}\n");
// Generate URLs using anonymous git://
//
String url = cfg.getString("gerrit", null, "canonicalGitUrl");
if (url != null) {
if (url.endsWith("/")) {
url = url.substring(0, url.length() - 1);
}
p.print("if ($ENV{'GERRIT_ANONYMOUS_READ'}) {\n");
p.print(" push @git_base_url_list, ");
p.print(quoteForPerl(url));
p.print(";\n");
p.print("}\n");
}
// Generate URLs using authenticated ssh://
//
if (sshInfo != null && !sshInfo.getHostKeys().isEmpty()) {
String sshAddr = sshInfo.getHostKeys().get(0).getHost();
p.print("if ($ENV{'GERRIT_USER_NAME'}) {\n");
p.print(" push @git_base_url_list, join('', 'ssh://'");
p.print(", $ENV{'GERRIT_USER_NAME'}");
p.print(", '@'");
if (sshAddr.startsWith("*:") || "".equals(sshAddr)) {
p.print(", $ENV{'SERVER_NAME'}");
}
if (sshAddr.startsWith("*")) {
sshAddr = sshAddr.substring(1);
}
p.print(", " + quoteForPerl(sshAddr));
p.print(");\n");
p.print("}\n");
}
// Link back to Gerrit (when possible, to matching review record).
// Supported gitweb's hash values are:
// - (missing),
// - HEAD,
// - refs/heads/,
// - refs/changes/*//*,
// - .
//
p.print("sub add_review_link {\n");
p.print(" my $h = shift;\n");
p.print(" my $q;\n");
p.print(" if (!$h || $h eq 'HEAD') {\n");
p.print(" $q = qq{#/q/project:$ENV{'GERRIT_PROJECT_NAME'}};\n");
p.print(" } elsif ($h =~ /^refs\\/heads\\/([-\\w]+)$/) {\n");
p.print(" $q = qq{#/q/project:$ENV{'GERRIT_PROJECT_NAME'}");
p.print("+branch:$1};\n"); // wrapped
p.print(" } elsif ($h =~ /^refs\\/changes\\/\\d{2}\\/(\\d+)\\/\\d+$/) ");
p.print("{\n"); // wrapped
p.print(" $q = qq{#/c/$1};\n");
p.print(" } else {\n");
p.print(" $q = qq{#/q/$h};\n");
p.print(" }\n");
p.print(" my $r = qq{$ENV{'GERRIT_CONTEXT_PATH'}$q};\n");
p.print(" push @{$feature{'actions'}{'default'}},\n");
p.print(" ('review',$r,'commitdiff');\n");
p.print("}\n");
p.print("if ($cgi->param('hb')) {\n");
p.print(" add_review_link(scalar $cgi->param('hb'));\n");
p.print("} elsif ($cgi->param('h')) {\n");
p.print(" add_review_link(scalar $cgi->param('h'));\n");
p.print("} else {\n");
p.print(" add_review_link();\n");
p.print("}\n");
// If the administrator has created a site-specific gitweb_config,
// load that before we perform any final overrides.
//
Path sitecfg = site.site_gitweb;
if (Files.isRegularFile(sitecfg)) {
p.print("$GITWEB_CONFIG = " + quoteForPerl(sitecfg) + ";\n");
p.print("if (-e $GITWEB_CONFIG) {\n");
p.print(" do " + quoteForPerl(sitecfg) + ";\n");
p.print("}\n");
}
p.print("$projectroot = $ENV{'GITWEB_PROJECTROOT'};\n");
// Permit exporting only the project we were started for.
// We use the name under $projectroot in case symlinks
// were involved in the path.
//
p.print("$export_auth_hook = sub {\n");
p.print(" my $dir = shift;\n");
p.print(" my $name = $ENV{'GERRIT_PROJECT_NAME'};\n");
p.print(" my $allow = qq{$projectroot/$name.git};\n");
p.print(" return $dir eq $allow;\n");
p.print(" };\n");
// Do not allow the administrator to enable path info, its
// not a URL format we currently support.
//
p.print("$feature{'pathinfo'}{'override'} = 0;\n");
p.print("$feature{'pathinfo'}{'default'} = [0];\n");
// We don't do forking, so don't allow it to be enabled.
//
p.print("$feature{'forks'}{'override'} = 0;\n");
p.print("$feature{'forks'}{'default'} = [0];\n");
}
myconfFile.setReadOnly();
}
private static String quoteForPerl(Path value) {
return quoteForPerl(value.toAbsolutePath().toString());
}
private static String quoteForPerl(String value) {
if (value == null || value.isEmpty()) {
return "''";
}
if (!value.contains("'")) {
return "'" + value + "'";
}
if (!value.contains("{") && !value.contains("}")) {
return "q{" + value + "}";
}
throw new IllegalArgumentException("Cannot quote in Perl: " + value);
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
if (req.getQueryString() == null || req.getQueryString().isEmpty()) {
// No query string? They want the project list, which we don't
// currently support. Return to Gerrit's own web UI.
//
rsp.sendRedirect(req.getContextPath() + "/");
return;
}
final Map params = getParameters(req);
String a = params.get("a");
if (a != null) {
if (deniedActions.contains(a)) {
rsp.sendError(HttpServletResponse.SC_FORBIDDEN);
return;
}
if (a.equals(PROJECT_LIST_ACTION)) {
rsp.sendRedirect(
req.getContextPath()
+ "/#"
+ PageLinks.ADMIN_PROJECTS
+ "?filter="
+ Url.encode(params.get("pf") + "/"));
return;
}
}
String name = params.get("p");
if (name == null) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
if (name.endsWith(".git")) {
name = name.substring(0, name.length() - 4);
}
Project.NameKey nameKey = Project.nameKey(name);
Optional projectState;
try {
projectState = projectCache.get(nameKey);
if (!projectState.isPresent()) {
sendErrorOrRedirect(req, rsp, HttpServletResponse.SC_NOT_FOUND);
return;
}
projectState.get().checkStatePermitsRead();
permissionBackend.user(userProvider.get()).project(nameKey).check(ProjectPermission.READ);
} catch (AuthException e) {
sendErrorOrRedirect(req, rsp, HttpServletResponse.SC_NOT_FOUND);
return;
} catch (IOException | PermissionBackendException err) {
logger.atSevere().withCause(err).log("cannot load %s", name);
rsp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
} catch (ResourceConflictException e) {
sendErrorOrRedirect(req, rsp, HttpServletResponse.SC_CONFLICT);
return;
}
try (Repository repo = repoManager.openRepository(nameKey)) {
CacheHeaders.setNotCacheable(rsp);
exec(req, rsp, projectState.get());
} catch (RepositoryNotFoundException e) {
getServletContext().log("Cannot open repository", e);
rsp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
}
/**
* Sends error response if the user is authenticated. Or redirect the user to the login page. By
* doing this, anonymous users cannot infer the existence of a resource from the status code.
*/
private void sendErrorOrRedirect(HttpServletRequest req, HttpServletResponse rsp, int statusCode)
throws IOException {
if (userProvider.get().isIdentifiedUser()) {
rsp.sendError(statusCode);
} else {
rsp.sendRedirect(getLoginRedirectUrl(req));
}
}
private static String getLoginRedirectUrl(HttpServletRequest req) {
String contextPath = req.getContextPath();
String loginUrl = contextPath + "/login/";
String token = req.getRequestURI();
if (!contextPath.isEmpty()) {
token = token.substring(contextPath.length());
}
String queryString = req.getQueryString();
if (queryString != null && !queryString.isEmpty()) {
token = token + "?" + queryString;
}
return (loginUrl + Url.encode(token));
}
private static Map getParameters(HttpServletRequest req) {
final Map params = new HashMap<>();
for (String pair : Splitter.on(CharMatcher.anyOf("&;")).split(req.getQueryString())) {
final int eq = pair.indexOf('=');
if (0 < eq) {
String name = pair.substring(0, eq);
String value = pair.substring(eq + 1);
name = Url.decode(name);
value = Url.decode(value);
params.put(name, value);
}
}
return params;
}
private void exec(HttpServletRequest req, HttpServletResponse rsp, ProjectState projectState)
throws IOException {
final Process proc =
Runtime.getRuntime()
.exec(
new String[] {gitwebCgi.toAbsolutePath().toString()},
makeEnv(req, projectState),
gitwebCgi.toAbsolutePath().getParent().toFile());
copyStderrToLog(proc.getErrorStream());
if (0 < req.getContentLength()) {
copyContentToCGI(req, proc.getOutputStream());
} else {
proc.getOutputStream().close();
}
try (InputStream in = new BufferedInputStream(proc.getInputStream(), BUFFER_SIZE)) {
readCgiHeaders(rsp, in);
try (OutputStream out = rsp.getOutputStream()) {
final byte[] buf = new byte[BUFFER_SIZE];
int n;
while ((n = in.read(buf)) > 0) {
out.write(buf, 0, n);
}
}
} catch (IOException e) {
// The browser has probably closed its input stream. We don't
// want to continue executing this request.
//
proc.destroy();
return;
}
try {
proc.waitFor();
final int status = proc.exitValue();
if (0 != status) {
logger.atSevere().log("Non-zero exit status (%d) from %s", status, gitwebCgi);
if (!rsp.isCommitted()) {
rsp.sendError(500);
}
}
} catch (InterruptedException ie) {
logger.atFine().log("CGI: interrupted waiting for CGI to terminate");
}
}
private String[] makeEnv(HttpServletRequest req, ProjectState projectState)
throws RepositoryNotFoundException, IOException {
final EnvList env = new EnvList(_env);
final int contentLength = Math.max(0, req.getContentLength());
// These ones are from "The WWW Common Gateway Interface Version 1.1"
//
env.set("AUTH_TYPE", req.getAuthType());
env.set("CONTENT_LENGTH", Integer.toString(contentLength));
env.set("CONTENT_TYPE", req.getContentType());
env.set("GATEWAY_INTERFACE", "CGI/1.1");
env.set("PATH_INFO", req.getPathInfo());
env.set("PATH_TRANSLATED", null);
env.set("QUERY_STRING", req.getQueryString());
env.set("REMOTE_ADDR", req.getRemoteAddr());
env.set("REMOTE_HOST", req.getRemoteHost());
env.set("HTTPS", req.isSecure() ? "ON" : "OFF");
// The identity information reported about the connection by a
// RFC 1413 [11] request to the remote agent, if
// available. Servers MAY choose not to support this feature, or
// not to request the data for efficiency reasons.
// "REMOTE_IDENT" => "NYI"
//
env.set("REQUEST_METHOD", req.getMethod());
env.set("SCRIPT_NAME", req.getContextPath() + req.getServletPath());
env.set("SCRIPT_FILENAME", gitwebCgi.toAbsolutePath().toString());
env.set("SERVER_NAME", req.getServerName());
env.set("SERVER_PORT", Integer.toString(req.getServerPort()));
env.set("SERVER_PROTOCOL", req.getProtocol());
env.set("SERVER_SOFTWARE", getServletContext().getServerInfo());
for (String name : getHeaderNames(req)) {
final String value = req.getHeader(name);
env.set("HTTP_" + name.toUpperCase(Locale.US).replace('-', '_'), value);
}
Project.NameKey nameKey = projectState.getNameKey();
env.set("GERRIT_CONTEXT_PATH", req.getContextPath() + "/");
env.set("GERRIT_PROJECT_NAME", nameKey.get());
env.set("GITWEB_PROJECTROOT", getProjectRoot(nameKey));
if (projectState.statePermitsRead()
&& permissionBackend
.user(anonymousUserProvider.get())
.project(nameKey)
.testOrFalse(ProjectPermission.READ)) {
env.set("GERRIT_ANONYMOUS_READ", "1");
}
String remoteUser = null;
if (userProvider.get().isIdentifiedUser()) {
IdentifiedUser u = userProvider.get().asIdentifiedUser();
Optional user = u.getUserName();
env.set("GERRIT_USER_NAME", user.orElse(null));
remoteUser = user.orElseGet(() -> "account-" + u.getAccountId());
}
env.set("REMOTE_USER", remoteUser);
// Override CGI settings using alternative URI provided by gitweb.url.
// This is required to trick gitweb into thinking that it's served under
// different URL. Setting just $my_uri on the perl's side isn't enough,
// because few actions (atom, blobdiff_plain, commitdiff_plain) rely on
// URL returned by $cgi->self_url().
//
if (gitwebUrl != null) {
int schemePort = -1;
if (gitwebUrl.getScheme() != null) {
if (gitwebUrl.getScheme().equals("http")) {
env.set("HTTPS", "OFF");
schemePort = 80;
} else {
env.set("HTTPS", "ON");
schemePort = 443;
}
}
if (gitwebUrl.getHost() != null) {
env.set("SERVER_NAME", gitwebUrl.getHost());
env.set("HTTP_HOST", gitwebUrl.getHost());
}
if (gitwebUrl.getPort() != -1) {
env.set("SERVER_PORT", Integer.toString(gitwebUrl.getPort()));
} else if (schemePort != -1) {
env.set("SERVER_PORT", Integer.toString(schemePort));
}
if (gitwebUrl.getPath() != null) {
env.set("SCRIPT_NAME", gitwebUrl.getPath().isEmpty() ? "/" : gitwebUrl.getPath());
}
}
return env.getEnvArray();
}
/**
* Return the project root under which the specified project is stored.
*
* @param nameKey the name of the project
* @return base directory
*/
@VisibleForTesting
String getProjectRoot(Project.NameKey nameKey) throws RepositoryNotFoundException, IOException {
try (Repository repo = repoManager.openRepository(nameKey)) {
return getRepositoryRoot(repo, nameKey).toString();
}
}
/**
* Return the repository root under which the specified repository is stored.
*
* @param repo the name of the repository
* @param nameKey project name
* @return base path
* @throws ProvisionException if the repo is not DelegateRepository or FileRepository.
*/
private static Path getRepositoryRoot(Repository repo, Project.NameKey nameKey) {
if (repo instanceof DelegateRepository) {
return getRepositoryRoot(((DelegateRepository) repo).delegate(), nameKey);
}
if (repo instanceof FileRepository) {
String name = nameKey.get();
Path current = repo.getDirectory().toPath();
for (int i = 0; i <= CharMatcher.is('/').countIn(name); i++) {
current = current.getParent();
}
return current;
}
throw new ProvisionException("Gitweb can only be used with FileRepository");
}
private void copyContentToCGI(HttpServletRequest req, OutputStream dst) throws IOException {
final int contentLength = req.getContentLength();
final InputStream src = req.getInputStream();
new Thread(
() -> {
try {
try {
final byte[] buf = new byte[BUFFER_SIZE];
int remaining = contentLength;
while (0 < remaining) {
final int max = Math.max(buf.length, remaining);
final int n = src.read(buf, 0, max);
if (n < 0) {
throw new EOFException("Expected " + remaining + " more bytes");
}
dst.write(buf, 0, n);
remaining -= n;
}
} finally {
dst.close();
}
} catch (IOException e) {
logger.atSevere().withCause(e).log("Unexpected error copying input to CGI");
}
},
"Gitweb-InputFeeder")
.start();
}
private void copyStderrToLog(InputStream in) {
new Thread(
() -> {
try (BufferedReader br =
new BufferedReader(new InputStreamReader(in, ISO_8859_1.name()))) {
String err =
br.lines()
.filter(s -> !s.isEmpty())
.map(s -> "CGI: " + s)
.collect(Collectors.joining("\n"))
.trim();
if (!err.isEmpty()) {
logger.atSevere().log("%s", err);
}
} catch (IOException e) {
logger.atSevere().withCause(e).log("Unexpected error copying stderr from CGI");
}
},
"Gitweb-ErrorLogger")
.start();
}
private void readCgiHeaders(HttpServletResponse res, InputStream in) throws IOException {
String line;
while (!(line = readLine(in)).isEmpty()) {
if (line.startsWith("HTTP")) {
// CGI believes it is a non-parsed-header CGI. We refuse
// to support that here so abort.
//
throw new IOException("NPH CGI not supported: " + line);
}
final int sep = line.indexOf(':');
if (sep < 0) {
throw new IOException("CGI returned invalid header: " + line);
}
final String key = line.substring(0, sep).trim();
final String value = line.substring(sep + 1).trim();
if ("Location".equalsIgnoreCase(key)) {
res.sendRedirect(value);
} else if ("Status".equalsIgnoreCase(key)) {
final List token = Splitter.on(' ').splitToList(value);
final int status = Integer.parseInt(token.get(0));
res.setStatus(status);
} else {
res.addHeader(key, value);
}
}
}
private String readLine(InputStream in) throws IOException {
final StringBuilder buf = new StringBuilder();
int b;
while ((b = in.read()) != -1 && b != '\n') {
buf.append((char) b);
}
return buf.toString().trim();
}
@SuppressWarnings("JdkObsolete")
private static ImmutableList getHeaderNames(HttpServletRequest req) {
return ImmutableList.copyOf(Iterators.forEnumeration(req.getHeaderNames()));
}
/** private utility class that manages the Environment passed to exec. */
private static class EnvList {
private Map envMap;
EnvList() {
envMap = new HashMap<>();
}
EnvList(EnvList l) {
envMap = new HashMap<>(l.envMap);
}
/** Set a name/value pair, null values will be treated as an empty String */
public void set(String name, String value) {
if (value == null) {
value = "";
}
envMap.put(name, name + "=" + value);
}
/** Get representation suitable for passing to exec. */
public String[] getEnvArray() {
return envMap.values().toArray(new String[envMap.size()]);
}
@Override
public String toString() {
return envMap.toString();
}
}
}
