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Android XMPP服务器, BOSH(Http-Binding)和WEB客户端搭建

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12/01
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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 

yuminstallejabberd

#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, }.

{hosts, ["sagan.me"]}.

{host_config, "sagan.me", [{auth_method, [anonymous,internal]},{anonymous_protocol, sasl_anon}]}.

{listen,

 [

  {, ejabberd_c2s, [

                        {certfile, "/path/to/ssl/cert.pem"},

                        %%starttls,

                        starttls_required,

                        {access, c2s},

                        {shaper, c2s_shaper},

                        {max_stanza_size, }

                       ]},

  {, ejabberd_s2s_in, [

                           {shaper, s2s_shaper},

                           {max_stanza_size, }

                          ]},

  {{, "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" =>

        ) )

)

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 

varBOSH_SERVICE ='/xmpp-httpbind';

varconnection =null;

functionlog(msg)

{

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

}

functiononConnect(status)

{

if(status== Strophe.Status.CONNECTING){

log('Strophe is connecting.');

}elseif(status== Strophe.Status.CONNFAIL){

log('Strophe failed to connect.');

$('#connect').get().value='connect';

}elseif(status== Strophe.Status.DISCONNECTING){

log('Strophe is disconnecting.');

}elseif(status== Strophe.Status.DISCONNECTED){

log('Strophe is disconnected.');

$('#connect').get().value='connect';

}elseif(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());

varreply = $msg({to:"ono@oogami.name", from: connection.jid, type:'chat'}).c("body").t("Test Chat Message");

connection.send(reply.tree());

}

}

functiononMessage(msg){

varto = msg.getAttribute('to');

varfrom = msg.getAttribute('from');

vartype = msg.getAttribute('type');

varelems = msg.getElementsByTagName('body');

if(type =="chat"&&elems.length>){

varbody = elems[];

log('ECHOBOT: I got a message from '+ from +': '+

Strophe.getText(body));

varreply = $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.

returntrue;

}

$(document).ready(function(){

connection =newStrophe.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(){

varbutton = $('#connect').get();

if(button.value=='connect'){

button.value='disconnect';

connection.connect($('#jid').get().value,

$('#pass').get().value,

onConnect);

}else{

button.value='connect';

connection.disconnect();

}

});

});

将ono@oogami.name修改为一个测试Jabber帐号. 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 "ono@oogami.name"这个帐号发送一条"Test Message"的信息.

另: 测试匿名登录向somebody@gtalk.com 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

http://www.ibm.com/developerworks/cn/xml/tutorials/x-realtimeXMPPtut/index.html

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