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我一直在 ejabberd 中开发一个自定义模块。我需要提取消息的正文内容并检查节是否有消息文本。这是我的代码片段

-module(mod_push_generate).

-behaviour(gen_mod).

-include("logger.hrl").
-include("ejabberd_sql_pt.hrl").
-include("ejabberd_http.hrl").
-include("xmpp.hrl").
%-include("jlib.hrl").

%% gen_mod API callbacks
-export([start/2, stop/1, depends/2, mod_options/1, fetch_token/2, on_user_send_packet/1]).

start(Host,_Opts) ->
  ?INFO_MSG("Mod PUSH GENARATOR has been started",[]),
  inets:start(),
  ejabberd_hooks:add(user_send_packet, Host, ?MODULE, on_user_send_packet, 50),
  ok.

stop(Host) ->
  ?INFO_MSG("Module has been stopped",[]),
  ejabberd_hooks:delete(user_send_packet, Host, ?MODULE, on_user_send_packet, 50),
  ok.

depends(_Host, _Opts) ->
  [].


mod_options(_Host) ->
  [].

%-spec on_user_send_packet({stanza(), ejabberd_c2s:state()}) -> {stanza(), ejabberd_c2s:state()}.

%on_user_send_packet({From, To, XML} = Pkt) ->
on_user_send_packet({#message{to = Peer} = Pkt, #{jid := JID} = C2SState}) ->
  ?INFO_MSG("on user send packet called from  ",[Pkt]),
  Els = xmpp:get_els(Pkt),
  ?INFO_MSG("Body: ",[Els]),
  {Pkt, C2SState};

on_user_send_packet(Acc) ->
    ?INFO_MSG("Inside nothing box.",[]),
    Acc.

记录 Pkt 正在给予

12:41:17.956 [info] FORMAT ERROR: "on user send packet called from  " [{message,<<"2fe6c6a3-e89e-4f05-ac4d-b096b75f0f32">>,chat,<<"en">>,{jid,<<"sagar">>,<<"192.168.4.69">>,<<"sagar.webApp">>,<<"sagar">>,<<"192.168.4.69">>,<<"sagar.webApp">>},{jid,<<"tony">>,<<"192.168.4.69">>,<<>>,<<"tony">>,<<"192.168.4.69">>,<<>>},[],[{text,<<>>,<<"xasXASXAS">>}],undefined,[{xmlel,<<"request">>,[{<<"xmlns">>,<<"urn:xmpp:receipts">>}],[]}],#{ip => {0,0,0,0,0,65535,49320,1093}}}]

并且记录 Els 正在给予

14:04:25.906 [info] FORMAT ERROR: "Body: " [[{xmlel,<<"request">>,[{<<"xmlns">>,<<"urn:xmpp:receipts">>}],[]}]]

第二行显示我取出消息节的组件，唯一检测到的 xml 元素是“请求”元素。为什么消息节中没有“正文元素”。

还请告诉我如何取出（或检查是否存在）该节中的消息文本。

谢谢

4

1 回答 1

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为什么消息节中没有“正文元素”。

#message结构将正文内容保存在# message.body中，而不是#message.sub_els中。请参阅https://docs.ejabberd.im/developer/guide/#xmpp-codec中的示例

我需要提取消息的正文内容

试试这条线：

  ?INFO_MSG("Body: ~p", [ xmpp:get_text(Pkt#message.body) ]),

它将记录以下内容：

17:08:12.897 [info] Body: <<"hey, are you there?">>
17:08:12.926 [info] Body: <<>>

并检查节是否有消息文本。

当 Body 为 <<>> 时，表示它没有 body。

于 2019-12-02T16:10:24.737 回答