// 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.server.account;
import com.google.gerrit.common.data.AccessSection;
import com.google.gerrit.common.data.GlobalCapability;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.common.errors.InvalidUserNameException;
import com.google.gerrit.common.errors.NameAlreadyUsedException;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.AccountExternalId;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.reviewdb.client.AccountGroupMember;
import com.google.gerrit.reviewdb.client.AccountGroupMemberAudit;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.util.TimeUtil;
import com.google.gwtorm.server.OrmException;
import com.google.gwtorm.server.SchemaFactory;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicBoolean;
/** Tracks authentication related details for user accounts. */
@Singleton
public class AccountManager {
private static final Logger log =
LoggerFactory.getLogger(AccountManager.class);
private final SchemaFactory<ReviewDb> schema;
private final AccountCache byIdCache;
private final AccountByEmailCache byEmailCache;
private final Realm realm;
private final IdentifiedUser.GenericFactory userFactory;
private final ChangeUserName.Factory changeUserNameFactory;
private final ProjectCache projectCache;
private final AtomicBoolean awaitsFirstAccountCheck;
@Inject
AccountManager(final SchemaFactory<ReviewDb> schema,
final AccountCache byIdCache, final AccountByEmailCache byEmailCache,
final Realm accountMapper,
final IdentifiedUser.GenericFactory userFactory,
final ChangeUserName.Factory changeUserNameFactory,
final ProjectCache projectCache) throws OrmException {
this.schema = schema;
this.byIdCache = byIdCache;
this.byEmailCache = byEmailCache;
this.realm = accountMapper;
this.userFactory = userFactory;
this.changeUserNameFactory = changeUserNameFactory;
this.projectCache = projectCache;
this.awaitsFirstAccountCheck = new AtomicBoolean(true);
}
/**
* @return user identified by this external identity string, or null.
*/
public Account.Id lookup(final String externalId) throws AccountException {
try {
final ReviewDb db = schema.open();
try {
final AccountExternalId ext =
db.accountExternalIds().get(new AccountExternalId.Key(externalId));
return ext != null ? ext.getAccountId() : null;
} finally {
db.close();
}
} catch (OrmException e) {
throw new AccountException("Cannot lookup account " + externalId, e);
}
}
/**
* Authenticate the user, potentially creating a new account if they are new.
*
* @param who identity of the user, with any details we received about them.
* @return the result of authenticating the user.
* @throws AccountException the account does not exist, and cannot be created,
* or exists, but cannot be located, or is inactive.
*/
public AuthResult authenticate(AuthRequest who) throws AccountException {
who = realm.authenticate(who);
try {
final ReviewDb db = schema.open();
try {
final AccountExternalId.Key key = id(who);
final AccountExternalId id = db.accountExternalIds().get(key);
if (id == null) {
// New account, automatically create and return.
//
return create(db, who);
} else { // Account exists
Account act = db.accounts().get(id.getAccountId());
if (act == null || !act.isActive()) {
throw new AccountException("Authentication error, account inactive");
}
// return the identity to the caller.
update(db, who, id);
return new AuthResult(id.getAccountId(), key, false);
}
} finally {
db.close();
}
} catch (OrmException e) {
throw new AccountException("Authentication error", e);
}
}
private void update(final ReviewDb db, final AuthRequest who,
final AccountExternalId extId) throws OrmException {
final IdentifiedUser user = userFactory.create(extId.getAccountId());
Account toUpdate = null;
// If the email address was modified by the authentication provider,
// update our records to match the changed email.
//
final String newEmail = who.getEmailAddress();
final String oldEmail = extId.getEmailAddress();
if (newEmail != null && !newEmail.equals(oldEmail)) {
if (oldEmail != null
&& oldEmail.equals(user.getAccount().getPreferredEmail())) {
toUpdate = load(toUpdate, user.getAccountId(), db);
toUpdate.setPreferredEmail(newEmail);
}
extId.setEmailAddress(newEmail);
db.accountExternalIds().update(Collections.singleton(extId));
}
if (!realm.allowsEdit(Account.FieldName.FULL_NAME)
&& !eq(user.getAccount().getFullName(), who.getDisplayName())) {
toUpdate = load(toUpdate, user.getAccountId(), db);
toUpdate.setFullName(who.getDisplayName());
}
if (!realm.allowsEdit(Account.FieldName.USER_NAME)
&& !eq(user.getUserName(), who.getUserName())) {
changeUserNameFactory.create(db, user, who.getUserName());
}
if (toUpdate != null) {
db.accounts().update(Collections.singleton(toUpdate));
}
if (newEmail != null && !newEmail.equals(oldEmail)) {
byEmailCache.evict(oldEmail);
byEmailCache.evict(newEmail);
}
if (toUpdate != null) {
byIdCache.evict(toUpdate.getId());
}
}
private Account load(Account toUpdate, Account.Id accountId, ReviewDb db)
throws OrmException {
if (toUpdate == null) {
toUpdate = db.accounts().get(accountId);
if (toUpdate == null) {
throw new OrmException("Account " + accountId + " has been deleted");
}
}
return toUpdate;
}
private static boolean eq(final String a, final String b) {
return (a == null && b == null) || (a != null && a.equals(b));
}
private AuthResult create(final ReviewDb db, final AuthRequest who)
throws OrmException, AccountException {
final Account.Id newId = new Account.Id(db.nextAccountId());
final Account account = new Account(newId, TimeUtil.nowTs());
final AccountExternalId extId = createId(newId, who);
extId.setEmailAddress(who.getEmailAddress());
account.setFullName(who.getDisplayName());
account.setPreferredEmail(extId.getEmailAddress());
final boolean isFirstAccount = awaitsFirstAccountCheck.getAndSet(false)
&& db.accounts().anyAccounts().toList().isEmpty();
try {
db.accounts().upsert(Collections.singleton(account));
db.accountExternalIds().upsert(Collections.singleton(extId));
} finally {
// If adding the account failed, it may be that it actually was the
// first account. So we reset the 'check for first account'-guard, as
// otherwise the first account would not get administration permissions.
awaitsFirstAccountCheck.set(isFirstAccount);
}
if (isFirstAccount) {
// This is the first user account on our site. Assume this user
// is going to be the site's administrator and just make them that
// to bootstrap the authentication database.
//
Permission admin = projectCache.getAllProjects()
.getConfig()
.getAccessSection(AccessSection.GLOBAL_CAPABILITIES)
.getPermission(GlobalCapability.ADMINISTRATE_SERVER);
final AccountGroup.UUID uuid = admin.getRules().get(0).getGroup().getUUID();
final AccountGroup g = db.accountGroups().byUUID(uuid).iterator().next();
final AccountGroup.Id adminId = g.getId();
final AccountGroupMember m =
new AccountGroupMember(new AccountGroupMember.Key(newId, adminId));
db.accountGroupMembersAudit().insert(Collections.singleton(
new AccountGroupMemberAudit(m, newId, TimeUtil.nowTs())));
db.accountGroupMembers().insert(Collections.singleton(m));
}
if (who.getUserName() != null) {
// Only set if the name hasn't been used yet, but was given to us.
//
IdentifiedUser user = userFactory.create(newId);
try {
changeUserNameFactory.create(db, user, who.getUserName()).call();
} catch (NameAlreadyUsedException e) {
final String message =
"Cannot assign user name \"" + who.getUserName() + "\" to account "
+ newId + "; name already in use.";
handleSettingUserNameFailure(db, account, extId, message, e, false);
} catch (InvalidUserNameException e) {
final String message =
"Cannot assign user name \"" + who.getUserName() + "\" to account "
+ newId + "; name does not conform.";
handleSettingUserNameFailure(db, account, extId, message, e, false);
} catch (OrmException e) {
final String message = "Cannot assign user name";
handleSettingUserNameFailure(db, account, extId, message, e, true);
}
}
byEmailCache.evict(account.getPreferredEmail());
realm.onCreateAccount(who, account);
return new AuthResult(newId, extId.getKey(), true);
}
/**
* This method handles an exception that occurred during the setting of the
* user name for a newly created account. If the realm does not allow the user
* to set a user name manually this method deletes the newly created account
* and throws an {@link AccountUserNameException}. In any case the error
* message is logged.
*
* @param db the database
* @param account the newly created account
* @param extId the newly created external id
* @param errorMessage the error message
* @param e the exception that occurred during the setting of the user name
* for the new account
* @param logException flag that decides whether the exception should be
* included into the log
* @throws AccountUserNameException thrown if the realm does not allow the
* user to manually set the user name
* @throws OrmException thrown if cleaning the database failed
*/
private void handleSettingUserNameFailure(final ReviewDb db,
final Account account, final AccountExternalId extId,
final String errorMessage, final Exception e, final boolean logException)
throws AccountUserNameException, OrmException {
if (logException) {
log.error(errorMessage, e);
} else {
log.error(errorMessage);
}
if (!realm.allowsEdit(Account.FieldName.USER_NAME)) {
// setting the given user name has failed, but the realm does not
// allow the user to manually set a user name,
// this means we would end with an account without user name
// (without 'username:<USERNAME>' entry in
// account_external_ids table),
// such an account cannot be used for uploading changes,
// this is why the best we can do here is to fail early and cleanup
// the database
db.accounts().delete(Collections.singleton(account));
db.accountExternalIds().delete(Collections.singleton(extId));
throw new AccountUserNameException(errorMessage, e);
}
}
private static AccountExternalId createId(final Account.Id newId,
final AuthRequest who) {
final String ext = who.getExternalId();
return new AccountExternalId(newId, new AccountExternalId.Key(ext));
}
/**
* Link another authentication identity to an existing account.
*
* @param to account to link the identity onto.
* @param who the additional identity.
* @return the result of linking the identity to the user.
* @throws AccountException the identity belongs to a different account, or it
* cannot be linked at this time.
*/
public AuthResult link(final Account.Id to, AuthRequest who)
throws AccountException, OrmException {
final ReviewDb db = schema.open();
try {
who = realm.link(db, to, who);
final AccountExternalId.Key key = id(who);
AccountExternalId extId = db.accountExternalIds().get(key);
if (extId != null) {
if (!extId.getAccountId().equals(to)) {
throw new AccountException("Identity in use by another account");
}
update(db, who, extId);
} else {
extId = createId(to, who);
extId.setEmailAddress(who.getEmailAddress());
db.accountExternalIds().insert(Collections.singleton(extId));
if (who.getEmailAddress() != null) {
final Account a = db.accounts().get(to);
if (a.getPreferredEmail() == null) {
a.setPreferredEmail(who.getEmailAddress());
db.accounts().update(Collections.singleton(a));
}
}
if (who.getEmailAddress() != null) {
byEmailCache.evict(who.getEmailAddress());
byIdCache.evict(to);
}
}
return new AuthResult(to, key, false);
} finally {
db.close();
}
}
/**
* Unlink an authentication identity from an existing account.
*
* @param from account to unlink the identity from.
* @param who the identity to delete
* @return the result of unlinking the identity from the user.
* @throws AccountException the identity belongs to a different account, or it
* cannot be unlinked at this time.
*/
public AuthResult unlink(final Account.Id from, AuthRequest who)
throws AccountException, OrmException {
final ReviewDb db = schema.open();
try {
who = realm.unlink(db, from, who);
final AccountExternalId.Key key = id(who);
AccountExternalId extId = db.accountExternalIds().get(key);
if (extId != null) {
if (!extId.getAccountId().equals(from)) {
throw new AccountException("Identity in use by another account");
}
db.accountExternalIds().delete(Collections.singleton(extId));
if (who.getEmailAddress() != null) {
final Account a = db.accounts().get(from);
if (a.getPreferredEmail() != null
&& a.getPreferredEmail().equals(who.getEmailAddress())) {
a.setPreferredEmail(null);
db.accounts().update(Collections.singleton(a));
}
byEmailCache.evict(who.getEmailAddress());
byIdCache.evict(from);
}
} else {
throw new AccountException("Identity not found");
}
return new AuthResult(from, key, false);
} finally {
db.close();
}
}
private static AccountExternalId.Key id(final AuthRequest who) {
return new AccountExternalId.Key(who.getExternalId());
}
}