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// Copyright (C) 2010 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.errors.NoSuchEntityException;
import com.google.gerrit.reviewdb.client.AccountExternalId;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import org.apache.commons.codec.binary.Base64;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Collections;
import java.util.concurrent.Callable;
/** Operation to generate a password for an account. */
public class GeneratePassword implements Callable<AccountExternalId> {
private static final int LEN = 12;
private static final SecureRandom rng;
static {
try {
rng = SecureRandom.getInstance("SHA1PRNG");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Cannot create RNG for password generator", e);
}
}
public interface Factory {
GeneratePassword create(AccountExternalId.Key forUser);
}
private final AccountCache accountCache;
private final ReviewDb db;
private final IdentifiedUser user;
private final AccountExternalId.Key forUser;
@Inject
GeneratePassword(final AccountCache accountCache, final ReviewDb db,
final IdentifiedUser user,
@Assisted AccountExternalId.Key forUser) {
this.accountCache = accountCache;
this.db = db;
this.user = user;
this.forUser = forUser;
}
public AccountExternalId call() throws OrmException, NoSuchEntityException {
AccountExternalId id = db.accountExternalIds().get(forUser);
if (id == null || !user.getAccountId().equals(id.getAccountId())) {
throw new NoSuchEntityException();
}
id.setPassword(generate());
db.accountExternalIds().update(Collections.singleton(id));
accountCache.evict(user.getAccountId());
return id;
}
private String generate() {
byte[] rand = new byte[LEN];
rng.nextBytes(rand);
byte[] enc = Base64.encodeBase64(rand, false);
StringBuilder r = new StringBuilder(LEN);
for (int i = 0; i < LEN; i++) {
if (enc[i] == '=') {
break;
}
r.append((char) enc[i]);
}
return r.toString();
}
}
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