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// 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 static java.util.concurrent.TimeUnit.HOURS;
import static java.util.concurrent.TimeUnit.MINUTES;
import com.google.gerrit.httpd.WebSessionManager.Key;
import com.google.gerrit.httpd.WebSessionManager.Val;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.AccountExternalId;
import com.google.gerrit.server.AccessPath;
import com.google.gerrit.server.AnonymousUser;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.AuthResult;
import com.google.gerrit.server.cache.Cache;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.cache.EvictionPolicy;
import com.google.gerrit.server.config.AuthConfig;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.google.inject.servlet.RequestScoped;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@RequestScoped
public final class CacheBasedWebSession implements WebSession {
private static final String ACCOUNT_COOKIE = "GerritAccount";
static final long MAX_AGE_MINUTES = HOURS.toMinutes(12);
public static Module module() {
return new CacheModule() {
@Override
protected void configure() {
final String cacheName = WebSessionManager.CACHE_NAME;
final TypeLiteral<Cache<Key, Val>> type =
new TypeLiteral<Cache<Key, Val>>() {};
disk(type, cacheName) //
.memoryLimit(1024) // reasonable default for many sites
.maxAge(MAX_AGE_MINUTES, MINUTES) // expire sessions if they are inactive
.evictionPolicy(EvictionPolicy.LRU) // keep most recently used
;
bind(WebSessionManager.class);
bind(WebSession.class)
.to(CacheBasedWebSession.class)
.in(RequestScoped.class);
}
};
}
private final HttpServletRequest request;
private final HttpServletResponse response;
private final WebSessionManager manager;
private final AuthConfig authConfig;
private final Provider<AnonymousUser> anonymousProvider;
private final IdentifiedUser.RequestFactory identified;
private AccessPath accessPath = AccessPath.WEB_UI;
private Cookie outCookie;
private Key key;
private Val val;
@Inject
CacheBasedWebSession(final HttpServletRequest request,
final HttpServletResponse response, final WebSessionManager manager,
final AuthConfig authConfig,
final Provider<AnonymousUser> anonymousProvider,
final IdentifiedUser.RequestFactory identified) {
this.request = request;
this.response = response;
this.manager = manager;
this.authConfig = authConfig;
this.anonymousProvider = anonymousProvider;
this.identified = identified;
final String cookie = readCookie();
if (cookie != null) {
key = new Key(cookie);
val = manager.get(key);
} else {
key = null;
val = null;
}
if (isSignedIn() && val.needsCookieRefresh()) {
// Cookie is more than half old. Send the cookie again to the
// client with an updated expiration date. We don't dare to
// change the key token here because there may be other RPCs
// queued up in the browser whose xsrfKey would not get updated
// with the new token, causing them to fail.
//
val = manager.createVal(key, val);
saveCookie();
}
}
private String readCookie() {
final Cookie[] all = request.getCookies();
if (all != null) {
for (final Cookie c : all) {
if (ACCOUNT_COOKIE.equals(c.getName())) {
final String v = c.getValue();
return v != null && !"".equals(v) ? v : null;
}
}
}
return null;
}
public boolean isSignedIn() {
return val != null;
}
public String getToken() {
return isSignedIn() ? val.getXsrfToken() : null;
}
public boolean isTokenValid(final String inputToken) {
return isSignedIn() //
&& val.getXsrfToken() != null //
&& val.getXsrfToken().equals(inputToken);
}
public AccountExternalId.Key getLastLoginExternalId() {
return val != null ? val.getExternalId() : null;
}
public CurrentUser getCurrentUser() {
if (isSignedIn()) {
return identified.create(accessPath, val.getAccountId());
}
return anonymousProvider.get();
}
public void login(final AuthResult res, final boolean rememberMe) {
final Account.Id id = res.getAccountId();
final AccountExternalId.Key identity = res.getExternalId();
if (val != null) {
manager.destroy(key);
}
key = manager.createKey(id);
val = manager.createVal(key, id, rememberMe, identity, null);
saveCookie();
}
/** Change the access path from the default of {@link AccessPath#WEB_UI}. */
public void setAccessPath(AccessPath path) {
accessPath = path;
}
/** Set the user account for this current request only. */
public void setUserAccountId(Account.Id id) {
key = new Key("id:" + id);
val = new Val(id, 0, false, null, "");
}
public void logout() {
if (val != null) {
manager.destroy(key);
key = null;
val = null;
saveCookie();
}
}
private void saveCookie() {
final String token;
final int ageSeconds;
if (key == null) {
token = "";
ageSeconds = 0 /* erase at client */;
} else {
token = key.getToken();
ageSeconds = manager.getCookieAge(val);
}
String path = authConfig.getCookiePath();
if (path == null || path.isEmpty()) {
path = request.getContextPath();
if (path == null || path.isEmpty()) {
path = "/";
}
}
if (outCookie != null) {
throw new IllegalStateException("Cookie " + ACCOUNT_COOKIE + " was set");
}
outCookie = new Cookie(ACCOUNT_COOKIE, token);
outCookie.setSecure(isSecure(request));
outCookie.setPath(path);
outCookie.setMaxAge(ageSeconds);
outCookie.setSecure(authConfig.getCookieSecure());
response.addCookie(outCookie);
}
private static boolean isSecure(final HttpServletRequest req) {
return req.isSecure() || "https".equals(req.getScheme());
}
}
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