// Copyright (C) 2012 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.auth;

import com.google.common.base.Strings;
import com.google.gerrit.server.account.AccountCache;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.config.AuthConfig;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import java.util.Locale;

@Singleton
public class InternalAuthBackend implements AuthBackend {
  private final AccountCache accountCache;
  private final AuthConfig authConfig;

  @Inject
  InternalAuthBackend(AccountCache accountCache, AuthConfig authConfig) {
    this.accountCache = accountCache;
    this.authConfig = authConfig;
  }

  @Override
  public String getDomain() {
    return "gerrit";
  }

  @Override
  public AuthUser authenticate(AuthRequest req)
      throws MissingCredentialsException, InvalidCredentialsException,
      UnknownUserException, UserNotAllowedException, AuthException {
    if (Strings.isNullOrEmpty(req.getUsername())
        || Strings.isNullOrEmpty(req.getPassword())) {
      throw new MissingCredentialsException();
    }

    String username;
    if (authConfig.isUserNameToLowerCase()) {
      username = req.getUsername().toLowerCase(Locale.US);
    } else {
      username = req.getUsername();
    }

    final AccountState who = accountCache.getByUsername(username);
    if (who == null) {
      throw new UnknownUserException();
    } else if (!who.getAccount().isActive()) {
      throw new UserNotAllowedException("Authentication failed for " + username
          + ": account inactive or not provisioned in Gerrit");
    }

    req.checkPassword(who.getPassword(username));
    return new AuthUser(new AuthUser.UUID(username), username);
  }
}