com.google.gerrit.httpd.RequireSslFilter 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.
package com.google.gerrit.httpd;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.server.config.CanonicalWebUrl;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.servlet.ServletModule;
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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** Requires the connection to use SSL, redirects if not. */
@Singleton
public class RequireSslFilter implements Filter {
public static class Module extends ServletModule {
private final boolean wantSsl;
@Inject
Module(@Nullable @CanonicalWebUrl String canonicalUrl) {
this.wantSsl = canonicalUrl != null && canonicalUrl.startsWith("https:");
}
@Override
protected void configureServlets() {
if (wantSsl) {
filter("/*").through(RequireSslFilter.class);
}
}
}
private final Provider urlProvider;
@Inject
RequireSslFilter(@CanonicalWebUrl @Nullable final Provider urlProvider) {
this.urlProvider = urlProvider;
}
@Override
public void init(FilterConfig filterConfig) {}
@Override
public void destroy() {}
@Override
public void doFilter(
final ServletRequest request, final ServletResponse response, final FilterChain chain)
throws IOException, ServletException {
final HttpServletRequest req = (HttpServletRequest) request;
final HttpServletResponse rsp = (HttpServletResponse) response;
if (isSecure(req)) {
chain.doFilter(request, response);
} else {
// If we wanted SSL, but the user didn't come to us over it,
// force SSL by issuing a protocol redirect. Try to keep the
// name "localhost" in case this is an SSH port tunnel.
//
final String url;
if (isLocalHost(req)) {
final StringBuffer b = req.getRequestURL();
b.replace(0, b.indexOf(":"), "https");
url = b.toString();
} else {
url = urlProvider.get() + req.getServletPath();
}
rsp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
rsp.setHeader("Location", url);
}
}
private static boolean isSecure(final HttpServletRequest req) {
return "https".equals(req.getScheme()) || req.isSecure();
}
private static boolean isLocalHost(final HttpServletRequest req) {
return "localhost".equals(req.getServerName()) || "127.0.0.1".equals(req.getServerName());
}
}