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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package proxyprotocol

import (
	"net"
	"time"
)

// Listener is used to wrap an underlying listener,
// whose connections may be using the HAProxy Proxy Protocol (version 1 or 2).
// If the connection is using the protocol, the RemoteAddr() will return
// the correct client address.
//
// Optionally define ProxyHeaderTimeout to set a maximum time to
// receive the Proxy Protocol Header. Zero means no timeout.
type Listener struct {
	Listener           net.Listener
	ProxyHeaderTimeout time.Duration
	AcceptUnknown      bool // allow PROXY UNKNOWN
}

// Accept implements the Accept method in the Listener interface
// it waits for the next call and returns a wrapped Conn.
func (p *Listener) Accept() (net.Conn, error) {
	// Get the underlying connection
	conn, err := p.Listener.Accept()
	if err != nil {
		return nil, err
	}

	newConn := NewConn(conn, p.ProxyHeaderTimeout)
	newConn.acceptUnknown = p.AcceptUnknown
	return newConn, nil
}

// Close closes the underlying listener.
func (p *Listener) Close() error {
	return p.Listener.Close()
}

// Addr returns the underlying listener's network address.
func (p *Listener) Addr() net.Addr {
	return p.Listener.Addr()
}