PHP 单页面在线聊天

2021/9/29 14:11:01

编程Tag： let data 页面 php 聊天 file list content room

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使用PHP做的单页面在线聊天。

基本功能：

1. 多人聊天
2. 多房间
3. 传输信息加密，基于base64+字符替换实现
4. 基于长连接读取（ngnix使用PHP sleep有问题）
5. 支持昵称自定义，并使用浏览器保存。
6. 需要在程序目录创建chat_data文件夹，用来存储历史聊天数据（仅保留最近1分钟）

原代码如下：

<?php
// 系统入口
date_default_timezone_set("PRC");
error_reporting(E_ALL & ~E_NOTICE);
set_time_limit(30);

$room = $_REQUEST['room'] ?? 'default';
$type = $_REQUEST['type'] ?? 'enter';
$type = strtolower($type);

// 创建新房间
function newRoom($room)
{
    $room_file = './chat_data/' . $room . '.txt';
    $key_list = array_merge(range(48, 57), range(65, 90), range(97, 122), [43, 47, 61]);
    $key1_list = $key_list;
    shuffle($key1_list);
    $room_data = [
        'name'   => $room,
        'encode' => array_combine($key_list, $key1_list),
        'list'   => [],
        'time'   => date('Y-m-d H:i:s'),
    ];
    file_put_contents($room_file, json_encode($room_data));
}

// 获取消息列表
function getMsg($room, $last_id)
{
    $room_file = './chat_data/' . $room . '.txt';
    $msg_list = [];

    $room_data = json_decode(file_get_contents($room_file), true);
    $list = $room_data['list'];

    // 清楚1分钟前消息
    $cur_list = [];
    $del_time = date('Y-m-d H:i:s', time() - 60);
    foreach ($list as $r)
    {
        if ($r['time'] > $del_time)
        {
            $cur_list[] = $r;
        }
    }

    if (count($cur_list) != count($list) && count($list) > 0)
    {
        $room_data['list'] = $cur_list;
        file_put_contents($room_file, json_encode($room_data));
    }

    // 查找最新消息
    foreach ($list as $r)
    {
        if ($r['id'] > $last_id)
        {
            $msg_list[] = $r;
        }
    }

    return $msg_list;
}

$room_file = './chat_data/' . $room . '.txt';

switch ($type)
{
    case 'enter':   // 进入房间
        break;
    case 'get':     // 获取消息
        $last_id = $_REQUEST['last_id'];
        $msg_list = [];

        if (strpos($_SERVER['SERVER_SOFTWARE'], 'nginx') !== false)
        {
            $msg_list = getMsg($room, $last_id);
        }
        else
        {
            // nginx 使用sleep将会把整个网站卡死
            for ($i=0; $i<20; $i++)
            {
                $msg_list = getMsg($room, $last_id);
                
                if (!empty($msg_list))
                {
                    break;
                }
    
                usleep(500000);
            }
        }

        echo json_encode(['result' => 'ok', 'list' => $msg_list]);

        break;
    case 'send':    // 发送消息
        $item = [
            'id' => round(microtime(true) * 1000),
            'user' => $_REQUEST['user'],
            'content' => $_REQUEST['content'],
            'time' => date('Y-m-d H:i:s'),
        ];
        $room_data = json_decode(file_get_contents($room_file), true);
        $room_data['list'][] = $item;
        file_put_contents($room_file, json_encode($room_data));
        echo json_encode(['result' => 'ok']);
        break;
    case 'new':     // 新建房间
        mt_srand();
        $room = strtoupper(md5(uniqid(mt_rand(), true)));
        $room = substr($room, 0, 10);
        newRoom($room);
        header('Location:chat.php?room=' . $room);
        break;
    default:
        echo 'ERROR:no type!';
        break;
}

if ($type != 'enter')
{
    exit;
}

if (!file_exists($room_file))
{
    if ($room == 'default')
    {
        newRoom($room);
    }
    else
    {
        echo 'ERROR:room not exists!';
        exit;
    }
}

$room_data = json_decode(file_get_contents($room_file), true);
unset($room_data['list']);

$user = 'User' . str_pad((time() % 99 + 1), 2, '0', STR_PAD_LEFT);

?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>PHP 在线聊天</title>

<link href="https://lib.baomitu.com/normalize/latest/normalize.min.css" rel="stylesheet">
<style>
/* css style */
body{
    padding:0 10px;
}
.divMain{
    font-size:14px;
    line-height: 2;
}

#divList span{
    color:gray;
}

</style>

<script src="https://lib.baomitu.com/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>
    
<h1>PHP 在线聊天</h1>
<div class="divMain">
<?php if ($room != 'default'){?>
<div>复制网页链接发给朋友一起聊天！</div>
<?php } ?>
昵称：<input id="txtUser" type="text" maxlength="50" value="<?=$user?>" />
<button onclick="$('#divList').html('');">清空</button>
&nbsp; 
<a href="chat.php?type=new">新房间</a>
<br>
内容：<input id="txtContent" type="text" value="" maxlength="100" style="width: 300px;" />
<button onclick="sendMsg();">发送</button>

<hr>
<div id="divList"></div>
</div>

<!--使用worker获取消息数据，注意ngnix会阻塞整个进程-->
<script id="worker" type="app/worker">
    var room = '<?=$room_data['name']?>';
    var isBusy = false;
    var lastId = -1;

    var urlBase = '';
    addEventListener('message', function (evt) {
        urlBase = evt.data;
    }, false);
    setInterval(function(){
        if (isBusy) return;
        isBusy = true;

        let url = new URL( 'chat.php?type=get&room=' + room + '&last_id=' + lastId, urlBase );
        fetch(url)
        .then(res=>res.json())
        .then(function(res){
            isBusy = false;
            if (res.list.length > 0)
            {
                lastId = res.list[res.list.length-1].id;
            }
            self.postMessage(res);
        })
        .catch(function(err){
            isBusy = false;
        });
    }, 1000);
</script>
<script>
    var blob = new Blob([document.querySelector('#worker').textContent]);
    var url = window.URL.createObjectURL(blob);
    var worker = new Worker(url);

    worker.onmessage = function (e) {
        let res = e.data;
        let html = '';
        for (let k in res.list)
        {
            let r = res.list[k];
            html = '<div><span>' + r.time + '</span> <b>' + r.user + ':</b> &nbsp; ' + decodeContent(r.content) + '</div>' + html;
        }

        $('#divList').prepend(html);
    };

    worker.postMessage(document.baseURI);
</script>

<script>
var room = <?=json_encode($room_data)?>;
room['decode'] = {};
for (let k in room.encode)
{
    room['decode'][room.encode[k]] = k;
}

// 发送消息
var lastSendTime = 0;
function sendMsg()
{
    let user = $('#txtUser').val().trim();
    let content = $('#txtContent').val().trim();

    if (content == '')
    {
        return;
    }

    if (user == '')
    {
        alert('昵称不能为空');
        return;
    }

    window.localStorage.setItem('r_' + room.name, user);
    
    // 限制0.5秒内仅允许发送1条消息
    let curTime = new Date().getTime();
    if (curTime - lastSendTime < 500)
    {
        return;
    }
    lastSendTime = curTime;

    $.ajax({
        url:'chat.php?type=send',
        data:{room:room.name, user:user, content:encodeContent(content)},
        type:'POST',
        dataType:'json',
        success:function(){
            $('#txtContent').val('');
            $('#txtContent').focus();
        },
    });
}

// 消息加密
function encodeContent(content)
{
    content = encodeURIComponent(content);
    content = window.btoa(content);

    let str = '';
    for (let i=0; i<content.length; i++)
    {
        str += String.fromCharCode(room.encode[content.charCodeAt(i)]);
    }

    return str;
}

// 消息解密
function decodeContent(content)
{
    let str = '';
    for (let i=0; i<content.length; i++)
    {
        str += String.fromCharCode(room.decode[content.charCodeAt(i)]);
    }

    str = window.atob(str);
    str = decodeURIComponent(str);

    return str;
}

$(function(){
    let userName = window.localStorage.getItem('r_' + room.name);
    if (userName)
    {
        $('#txtUser').val(userName);
    }

    $('#txtContent').keydown(function(e){
        if(e.keyCode==13){
            event.preventDefault();
            sendMsg();
        }
    });

    $('#txtContent').val('


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