Question

我正在客户端使用smack。我尝试在客户端搜索已注册的用户，因为在创建新用户之前，我想知道该ID是否已在服务器上注册（如果未注册），则可以创建该用户，或者登录该用户，但是ejabberd服务器因该错误而崩溃。这是ejabberd服务器的崩溃日志。

Failed to process iq:
#iq{
 id = <<"Hh6AJ-28">>,type = set,lang = <<"en">>,
 from =
  #jid{
   user = <<"admin">>,server = <<"faiqkhan-virtualbox">>,
   resource = <<"92526029764259513741138">>,luser = <<"admin">>,
   lserver = <<"faiqkhan-virtualbox">>,
   lresource = <<"92526029764259513741138">>},
 to =
  #jid{
   user = <<>>,server = <<"vjud.faiqkhan-virtualbox">>,resource = <<>>,
   luser = <<>>,lserver = <<"vjud.faiqkhan-virtualbox">>,lresource = <<>>},
 sub_els =
  [#xmlel{
    name = <<"query">>,
    attrs = [{<<"xmlns">>,<<"jabber:iq:search">>}],
    children =
     [#xmlel{
       name = <<"x">>,
       attrs = [{<<"xmlns">>,<<"jabber:x:data">>},{<<"type">>,<<"submit">>}],
       children =
        [#xmlel{
          name = <<"field">>,
          attrs = [{<<"var">>,<<"user">>},{<<"type">>,<<"text-single">>}],
          children =
           [#xmlel{
             name = <<"value">>,attrs = [],
             children = [{xmlcdata,<<"wasiq@faiqkhan-virtualbox">>}]}]}]}]}],
 meta = #{ip => {0,0,0,0,0,65535,49320,11092}}}
exception error: {module_not_loaded,mod_vcard_mnesia,
                                     <<"faiqkhan-virtualbox">>}
   in function  gen_mod:get_module_opts/2 (src/gen_mod.erl, line 338)
   in call from gen_mod:get_module_opt/3 (src/gen_mod.erl, line 318)
   in call from mod_vcard_mnesia:filter_fields/3 (src/mod_vcard_mnesia.erl, line 200)
   in call from mod_vcard_mnesia:search/4 (src/mod_vcard_mnesia.erl, line 78)
   in call from mod_vcard:search_result/4 (src/mod_vcard.erl, line 479)
   in call from mod_vcard:process_search/1 (src/mod_vcard.erl, line 264)
   in call from gen_iq_handler:process_iq/3 (src/gen_iq_handler.erl, line 131)
   in call from gen_iq_handler:process_iq/4 (src/gen_iq_handler.erl, line 109)

我使用以下代码从客户端获取注册用户：

InetAddress address = InetAddress.getByName(HOST);
DomainBareJid serviceName = JidCreate.domainBareFrom("faiqkhan-VirtualBox");        XMPPTCPConnectionConfiguration.Builder builder = XMPPTCPConnectionConfiguration.builder();
builder.setPort(PORT);
builder.setSendPresence(true);
builder.setHostAddress(address);
builder.setServiceName(serviceName);
builder.setUsernameAndPassword("admin", "123456");
builder.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
XMPPTCPConnection connection = new XMPPTCPConnection(builder.build());
try {
    connection.connect();
    connection.login("admin", "123456");
    Logger.showError("21560-connection created to: " + connection.getHost());
    Roster roster = Roster.getInstanceFor(connection);
    Set<RosterEntry> entities = roster.getEntries();
    UserSearchManager search = new UserSearchManager(connection);
    DomainBareJid s = JidCreate.domainBareFrom("vjud.".concat("faiqkhan-VirtualBox"));
    Form searchForm = search.getSearchForm(s);
    Form answerForm = searchForm.createAnswerForm();
    answerForm.setAnswer("user", "wasiq@faiqkhan-virtualbox");
    ReportedData data = search.getSearchResults(answerForm, s);
    if (data.getRows() != null) {
        for (ReportedData.Row row : data.getRows()) {
            for (CharSequence value : row.getValues("jid")) {
                Log.i("Iteartor values......", " " + value);
            }
        }
    }

    } catch (SmackException | IOException | XMPPException | InterruptedException e) {
        Logger.showError("21560-error on account creation: " + e.getMessage());
    }

服务器在ReportedData data = search.getSearchResults(answerForm, s);行代码上崩溃。

Answer 1

您在ejabberd中发现了一个错误：

该问题已于2018年修复 https://github.com/processone/ejabberd/commit/1be21126342d503205798605725ba5ceef9de42b
但该错误于2019年重新引入 https://github.com/processone/ejabberd/commit/a02cff0e780bb735531594c4ece81e8628f79782#diff-71f613241ed580c3e5dad2b4526503f2R12
我现在在中应用了一个临时修复程序 https://github.com/processone/ejabberd/commit/92913389a51ddc564f11e0712b0d82fca8c9aecb

但是，即使该错误已修复，您想要使用的功能也可能无济于事：用户必须设置其vCard才能在vJud搜索中提供其帐户。换句话说，vJUD在存储的vCard中搜索，而不是在注册帐户中搜索。如果我注册了一个帐户但未设置vCard，则vJUD将找不到它。

在创建新用户之前，我想知道该ID是否已在服务器上注册

为什么您不先尝试简单地注册帐户？

另一方面，如果您想事先检查一个帐户是否可以注册（就像某些网站注册网站一样，允许用户修改用户名直到一个可用），那么我认为XMPP出于安全原因没有提供这种可能性：不允许知道帐户是否存在。

一个解决方案是使用check_account ejabberd命令 https://docs.ejabberd.im/developer/ejabberd-api/admin-api/#check-account 使用一些前端执行它，例如ejabberdctl，ReST或XMLRPC https://docs.ejabberd.im/admin/guide/managing/#ejabberd-commands

$ ejabberdctl check_account user1 localhost
$ ejabberdctl check_account user6666 localhost
Error: false
~ 1

如何使用smack库从客户端在ejabberd服务器上搜索注册用户？

1 个答案: