com.google.gerrit.server.account.GeneratePassword.java Source code

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Here is the source code for com.google.gerrit.server.account.GeneratePassword.java

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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();
    }
}