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/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
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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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package org.apache.james.protocols.smtp.hook;

import java.util.Set;

import org.apache.james.protocols.smtp.SMTPSession;

import com.google.common.collect.ImmutableSet;

/**
 * Implement this interfaces to hook in the HELO Command
 */
public interface HeloHook extends Hook {
    /**
     * @return ESMTP extensions to be advertised as part of EHLO answers
     */
    default Set implementedEsmtpFeatures(SMTPSession session) {
        return ImmutableSet.of();
    }

    /**
     * Return the HookResult after run the hook
     * 
     * @param session the SMTPSession
     * @param helo the helo name
     * @return HockResult
     */
    HookResult doHelo(SMTPSession session, String helo);
}