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%%%----------------------------------------------------------------------
%%% File : xml.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : XML utils
%%% Created : 20 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(xml).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([element_to_string/1, crypt/1, remove_cdata/1, get_cdata/1,
get_attr/2, get_attr_s/2, make_error_iq_reply/3]).
element_to_string(El) ->
case El of
{xmlelement, Name, Attrs, Els} ->
if length(Els) > 0 ->
"<" ++ Name ++ attrs_to_string(Attrs) ++ ">" ++
lists:append(
lists:map(fun(E) -> element_to_string(E) end, Els))
++ "</" ++ Name ++ ">";
true ->
"<" ++ Name ++ attrs_to_string(Attrs) ++ "/>"
end;
{xmlcdata, CData} -> crypt(CData)
end.
attrs_to_string(Attrs) ->
lists:append(lists:map(fun(A) -> attr_to_string(A) end, Attrs)).
attr_to_string({Name, Value}) ->
" " ++ crypt(Name) ++ "='" ++ crypt(Value) ++ "'".
crypt(S) ->
lists:reverse(crypt(S, "")).
crypt([$& | S], R) ->
crypt(S, [$;, $p, $m, $a, $& | R]);
crypt([$< | S], R) ->
crypt(S, [$;, $t, $l, $& | R]);
crypt([$> | S], R) ->
crypt(S, [$;, $t, $g, $& | R]);
crypt([$" | S], R) ->
crypt(S, [$;, $t, $o, $u, $q, $& | R]);
crypt([$' | S], R) ->
crypt(S, [$;, $s, $o, $p, $a, $& | R]);
crypt([C | S], R) ->
crypt(S, [C | R]);
crypt([], R) ->
R.
remove_cdata(L) ->
lists:reverse(remove_cdata(L, [])).
remove_cdata([{xmlelement, Name, Attrs, Els} | L], R) ->
remove_cdata(L, [{xmlelement, Name, Attrs, Els} | R]);
remove_cdata([{xmlcdata, CData} | L], R) ->
remove_cdata(L, R);
remove_cdata([], R) ->
R.
get_cdata(L) ->
get_cdata(L, "").
get_cdata([{xmlcdata, CData} | L], S) ->
get_cdata(L, S ++ CData);
get_cdata([_ | L], S) ->
get_cdata(L, S);
get_cdata([], S) ->
S.
get_attr(AttrName, Attrs) ->
case lists:keysearch(AttrName, 1, Attrs) of
{value, {_, Val}} ->
{value, Val};
_ ->
false
end.
get_attr_s(AttrName, Attrs) ->
case lists:keysearch(AttrName, 1, Attrs) of
{value, {_, Val}} ->
Val;
_ ->
""
end.
make_error_iq_reply({xmlelement, Name, Attrs, SubTags}, Code, Desc)
when Name == "iq" ->
NewAttrs = make_error_iq_reply_attrs(Attrs),
{xmlelement, Name, NewAttrs, SubTags ++ [{xmlelement, "error",
[{"code", Code}],
[{xmlcdata, Desc}]}]}.
make_error_iq_reply_attrs(Attrs) ->
To = get_attr("to", Attrs),
From = get_attr("from", Attrs),
Attrs1 = lists:keydelete("to", 1, Attrs),
Attrs2 = lists:keydelete("from", 1, Attrs1),
Attrs3 = case To of
{value, ToVal} ->
[{"from", ToVal} | Attrs2];
_ ->
Attrs2
end,
Attrs4 = case From of
{value, FromVal} ->
[{"to", FromVal} | Attrs3];
_ ->
Attrs3
end,
Attrs5 = lists:keydelete("type", 1, Attrs4),
Attrs6 = [{"type", "error"} | Attrs5],
Attrs6.
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