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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;
import static com.google.common.base.Strings.nullToEmpty;
import com.google.gerrit.extensions.registration.DynamicItem;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.config.AuthConfig;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
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.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.http.server.GitSmartHttpTools;
@Singleton
public class XsrfCookieFilter implements Filter {
private final Provider<CurrentUser> user;
private final DynamicItem<WebSession> session;
private final AuthConfig authConfig;
@Inject
XsrfCookieFilter(
Provider<CurrentUser> user, DynamicItem<WebSession> session, AuthConfig authConfig) {
this.user = user;
this.session = session;
this.authConfig = authConfig;
}
@Override
public void doFilter(ServletRequest req, ServletResponse rsp, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) req;
if (!GitSmartHttpTools.isGitClient(httpRequest)) {
WebSession s = user.get().isIdentifiedUser() ? session.get() : null;
setXsrfTokenCookie(httpRequest, (HttpServletResponse) rsp, s);
}
chain.doFilter(req, rsp);
}
private void setXsrfTokenCookie(
HttpServletRequest req, HttpServletResponse rsp, WebSession session) {
String v = session != null ? session.getXGerritAuth() : null;
Cookie c = new Cookie(XsrfConstants.XSRF_COOKIE_NAME, nullToEmpty(v));
c.setPath("/");
c.setSecure(authConfig.getCookieSecure() && isSecure(req));
c.setMaxAge(
v != null
? -1 // Set the cookie for this browser session.
: 0); // Remove the cookie (expire immediately).
rsp.addCookie(c);
}
private boolean isSecure(HttpServletRequest req) {
return req.isSecure() || "https".equals(req.getScheme());
}
@Override
public void init(FilterConfig config) {}
@Override
public void destroy() {}
}
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