XMPP服务器, BOSH(Http-Binding)和WEB客户端搭建

自用笔记, 别当教程.

目标: 搭建一个XMPP服务器, 实现在web page上用javascript与自己XMPP服务器通信, 匿名登录并与任何一个XMPP(Jabber)帐户通信. (Gtalk目前尚有问题)

XMPP服务器可能不是必须的(见下文, 我没有尝试)

环境与配置:

XMPP服务器: ejabberd 文档
HTTP-Binding: 使用ejabberd搭建, 5280端口.
Javascript Client: Strophe 文档

安装Ejabberd

yum install ejabberd
#apt-get install ejabberd

编辑配置文件: /etc/ejabberd/ejabberd.cfg, 这是个era lang格式配置文件, 行注释符号是%. 请参考ejabberd文档.

下面是默认配置文件里我修改过部分:

%%debug
{loglevel, 5}.
{hosts, ["sagan.me"]}.
{host_config, "sagan.me", [{auth_method, [anonymous,internal]},{anonymous_protocol, sasl_anon}]}.

{listen,
 [
  {5222, ejabberd_c2s, [
                        {certfile, "/path/to/ssl/cert.pem"},
                        %%starttls,
                        starttls_required,
                        {access, c2s},
                        {shaper, c2s_shaper},
                        {max_stanza_size, 65536}
                       ]},
  {5269, ejabberd_s2s_in, [
                           {shaper, s2s_shaper},
                           {max_stanza_size, 131072}
                          ]},
  {{5280, "127.0.0.1"}, ejabberd_http, [
                        {request_handlers, [{["http-bind"], mod_http_bind}]},
                         captcha
                        ]}

 ]}.
{s2s_use_starttls, true}.
{s2s_certfile, "/path/to/ssl/cert.pem"}.
{s2s_default_policy, allow}.
{auth_method, [internal, anonymous]}.

上面配置中, 声明监听127.0.0.1(本地IP地址) 5280端口为http-binding (BOSH)服务地址, 路径是”http-bind”, 即服务实际URI是”http://127.0.0.1:5280/http-bind”. 然后需要在web服务器配置中用mod_proxy或mod_rewrite将80或443端口上对 “/http-bind” 访问转发到”http://127.0.0.1:5280/http-bind”, 因为由于浏览器同源限制, yourdomain.com:80上的web page是无法直接向yourdomain.tld:5280提交ajax请求的. ( 所以在上面配置中把ejabberd http-bind监听的端口设为了127.0.0.1:5280, 即不能从外部直接访问)

添加域名DNS SRV记录

这一步是必须的, 否则搭建的XMPP服务器基本上无法与大多数其它服务器或客户端通信. (插一句: Google Apps Talk基于XMPP平台, 如果不设置域名SRV记录的话, 就只能够用Gtalk登录(无法使用其它XMPP客户端), 而且只能和gmail.com或其它Google Apps域名的帐户通信)

_xmpp-client._tcp.sagan.me. 86400 IN SRV 10 0 5222 sagan.me.
_xmpp-server._tcp.sagan.me. 86400 IN SRV 10 0 5269 sagan.me.

5269和5222是XMPP在ICANN注册的标准端口.

修改WEB服务器配置

我的Lighttpd ModProxy配置:

proxy.server = (
        "/http-bind" => ( (
                "host" => "127.0.0.1",
                "port" => 5280
        ) )
)

应该也可以用web服务器直接转发请求到外部某个公开的Jabber (XMPP)服务器 http-bind地址, 我没有尝试. (基本上找不到公开的提供http-bind的XMPP服务器)

使用Javascript客户端

上面ejabberd配置里开启了匿名登录(ANOYMOUS mechanism), 最终目的就是为了在web page中匿名访问服务并向任何一个XMPP帐户发送消息.

下载Strophe JS库并上传到你的域名目录下(这个库只有一个文件strophe.js), 下面这个测试例子修改自Strophe examples目录下echobot.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Strophe.js Echobot Example</title>
  <script type='text/javascript'
          src='http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js'></script>
  <script type='text/javascript'
          src='../strophe.js'></script>
  <script type='text/javascript'
          src='echobot.js'></script>
</head>
<body>
  <div id='login' style='text-align: center'>
    <form name='cred'>
      <label for='jid'>JID:</label>
      <input type='text' id='jid' value="sagan.me" />
      <label for='pass'>Password:</label>
      <input type='password' id='pass' />
      <input type='button' id='connect' value='connect' />
    </form>
  </div>
  <hr />
  <div id='log'></div>
</body>
</html>

看echobot.js

var BOSH_SERVICE = '/xmpp-httpbind';
var connection = null;

function log(msg) 
{
    $('#log').append('<div></div>').append(document.createTextNode(msg));
}

function onConnect(status)
{
    if (status == Strophe.Status.CONNECTING) {
	log('Strophe is connecting.');
    } else if (status == Strophe.Status.CONNFAIL) {
	log('Strophe failed to connect.');
	$('#connect').get(0).value = 'connect';
    } else if (status == Strophe.Status.DISCONNECTING) {
	log('Strophe is disconnecting.');
    } else if (status == Strophe.Status.DISCONNECTED) {
	log('Strophe is disconnected.');
	$('#connect').get(0).value = 'connect';
    } else if (status == Strophe.Status.CONNECTED) {
	log('Strophe is connected.');
	log('ECHOBOT: Send a message to ' + connection.jid + 
	    ' to talk to me.');

	connection.addHandler(onMessage, null, 'message', null, null,  null); 
	connection.send($pres().tree());
	var reply = $msg({to: "[email protected]", from: connection.jid, type: 'chat'}).c("body").t("Test Chat Message");
        connection.send(reply.tree());
    }
}

function onMessage(msg) {
    var to = msg.getAttribute('to');
    var from = msg.getAttribute('from');
    var type = msg.getAttribute('type');
    var elems = msg.getElementsByTagName('body');

    if (type == "chat" && elems.length > 0) {
	var body = elems[0];

	log('ECHOBOT: I got a message from ' + from + ': ' + 
	    Strophe.getText(body));
    
	var reply = $msg({to: from, from: to, type: 'chat'})
            .cnode(Strophe.copyElement(body));
	connection.send(reply.tree());

	log('ECHOBOT: I sent ' + from + ': ' + Strophe.getText(body));
    }

    // we must return true to keep the handler alive.  
    // returning false would remove it after it finishes.
    return true;
}

$(document).ready(function () {
    connection = new Strophe.Connection(BOSH_SERVICE);

    // Uncomment the following lines to spy on the wire traffic.
    //connection.rawInput = function (data) { log('RECV: ' + data); };
    //connection.rawOutput = function (data) { log('SEND: ' + data); };

    // Uncomment the following line to see all the debug output.
    //Strophe.log = function (level, msg) { log('LOG: ' + msg); };


    $('#connect').bind('click', function () {
	var button = $('#connect').get(0);
	if (button.value == 'connect') {
	    button.value = 'disconnect';

	    connection.connect($('#jid').get(0).value,
			       $('#pass').get(0).value,
			       onConnect);
	} else {
	    button.value = 'connect';
	    connection.disconnect();
	}
    });
});

[email protected] 然后用浏览器打开echobot.html, 点击Connect按钮, Strophe就会匿名登录到刚刚建立的ejabber服务器( sagan.me ), 并向 “[email protected]”这个帐号发送一条”Test Message”的信息.

另: [email protected] 发送消息失败, log里显示Gtalk服务器返回信息是503 error, Service-Unavailable, 但如果正常登录并添加Gtalk为好友的话则可以. Gtalk禁止了匿名用户向其发送消息? 我还在查资料中.

我准备用Javascript写一个简单的XMPP WEB匿名客户端, 实现允许访客直接与Gtalk和Facebook Chat通信等功能.

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