拦截登录/注销ejabberd [英] Intercept login/logout ejabberd

问题描述

我想知道用户在自定义模块中的ejabberd会话中登录和注销的时间，而不改变ejabberd代码。

I want to know when a user is logged in and logged out from an ejabberd session in a custom module, without changing the ejabberd code.

我需要，因为当用户登录并清理用户注销时执行的操作时，我必须执行一些操作。此外，我需要能够在某些情况下注销用户。

I need that because I have to execute some actions when a user logs in and clean up the actions I did when the user logs out. Also, I need to be able to logoff a user given some circumstances.

那么，有没有办法扩展一些模块来获得这些功能？我仍然在寻找一些可以帮助我的文档。

So, is there a way to extend some module to get those feature? I'm still looking for some documentation that could help me with that.

推荐答案

你可以编写自己的代码并构建它一个插件与ejabberd给你的行为gen_mod。
这个开始的好地方是这个 blog /教程，并遵循下一部分 。
这应该是足够的，但你会发现更多在同一个博客。

You can write your own code and build it has a plugin with the behaviour gen_mod that ejabberd gives you. A nice place to begin with is this blog/tutorial and follow to next part. This should be enough but you will find more on the same blog.

在你建立自己的模块后，我建议你采取一个看看钩子 set_presence_hook 和 unset_presence_hook

After you get a little more comfortable with building your own module I suggest you take a look at the hooks set_presence_hook and unset_presence_hook

只要注意，set_presence_hook在每次存在设置时都被激活，而不是只有登录时，你只需要工作，如果可以的话。

Just notice that set_presence_hook is activated every time a presence is set, not only on log in, you just have to work that around, if you can.

长篇小说你最终会得到以下的一些东西：

Long story short you will end up with something like the following

-module(mod_your_mod).

-behavior(gen_mod).
-include("ejabberd.hrl").

-export([start/2, stop/1, on_set/4, on_unset/4]).

start(Host, _Opts) ->
   ejabberd_hooks:add(set_presence_hook, Host, ?MODULE, on_set, 50),
   ejabberd_hooks:add(unset_presence_hook, Host, ?MODULE, on_unset, 50),
   ok.

stop(Host) ->
   ejabberd_hooks:delete(set_presence_hook, Host, ?MODULE, on_set, 50),
   ejabberd_hooks:delete(unset_presence_hook, Host, ?MODULE, on_unset, 50),
   ok.

on_set(User, Server, _Resource, _Packet) ->
<presence code>    

on_unset(User, Server, _Resource, _Packet) ->
<offline code>

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