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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james.adapter.mailbox;

import javax.inject.Inject;

import org.apache.james.core.Username;
import org.apache.james.mailbox.Authorizator;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;

/**
 * Authorizator which use an UsersRepository to check if the delegation is allowed
 */
public class UserRepositoryAuthorizator implements Authorizator {

    private final UsersRepository repos;

    @Inject
    public UserRepositoryAuthorizator(UsersRepository repos) {
        this.repos = repos;
    }

    @Override
    public AuthorizationState canLoginAsOtherUser(Username userId, Username otherUserId) throws MailboxException {
        try {
            if (!repos.isAdministrator(userId)) {
                return AuthorizationState.NOT_ADMIN;
            }
            if (!repos.contains(otherUserId)) {
                return AuthorizationState.UNKNOWN_USER;
            }
            return AuthorizationState.ALLOWED;
        } catch (UsersRepositoryException e) {
            throw new MailboxException("Unable to access usersRepository", e);
        }
    }

}
