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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.auth.openid;
import com.google.common.collect.Iterables;
import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.server.CurrentUser;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.SortedMap;
import java.util.SortedSet;
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;
import javax.servlet.http.HttpSession;
/** OAuth web filter uses active OAuth session to perform OAuth requests */
@Singleton
class OAuthWebFilterOverOpenID implements Filter {
static final String GERRIT_LOGIN = "/login";
private final Provider<CurrentUser> currentUserProvider;
private final Provider<OAuthSessionOverOpenID> oauthSessionProvider;
private final DynamicMap<OAuthServiceProvider> oauthServiceProviders;
private OAuthServiceProvider ssoProvider;
@Inject
OAuthWebFilterOverOpenID(Provider<CurrentUser> currentUserProvider,
DynamicMap<OAuthServiceProvider> oauthServiceProviders,
Provider<OAuthSessionOverOpenID> oauthSessionProvider) {
this.currentUserProvider = currentUserProvider;
this.oauthServiceProviders = oauthServiceProviders;
this.oauthSessionProvider = oauthSessionProvider;
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
pickSSOServiceProvider();
}
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
HttpSession httpSession = ((HttpServletRequest) request).getSession(false);
if (currentUserProvider.get().isIdentifiedUser()) {
if (httpSession != null) {
httpSession.invalidate();
}
chain.doFilter(request, response);
return;
}
HttpServletResponse httpResponse = (HttpServletResponse) response;
OAuthSessionOverOpenID oauthSession = oauthSessionProvider.get();
OAuthServiceProvider service = ssoProvider == null
? oauthSession.getServiceProvider()
: ssoProvider;
if ((isGerritLogin(httpRequest)
|| oauthSession.isOAuthFinal(httpRequest))
&& !oauthSession.isLoggedIn()) {
if (service == null) {
throw new IllegalStateException("service is unknown");
}
oauthSession.setServiceProvider(service);
oauthSession.login(httpRequest, httpResponse, service);
} else {
chain.doFilter(httpRequest, response);
}
}
private void pickSSOServiceProvider()
throws ServletException {
SortedSet<String> plugins = oauthServiceProviders.plugins();
if (plugins.size() == 1) {
SortedMap<String, Provider<OAuthServiceProvider>> services =
oauthServiceProviders.byPlugin(Iterables.getOnlyElement(plugins));
if (services.size() == 1) {
ssoProvider = Iterables.getOnlyElement(services.values()).get();
}
}
}
private static boolean isGerritLogin(HttpServletRequest request) {
return request.getRequestURI().indexOf(GERRIT_LOGIN) >= 0;
}
}
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