%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2015-2015. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(httpd_custom).
-export([response_header/1, request_header/1, response_default_headers/0]).
-export([customize_headers/3, response_default_headers/1]).
-include("../inets_app/inets_internal.hrl").
-behaviour(httpd_custom_api).
%%--------------------------------------------------------------------
%% Behavior API -----------------------------------
%%--------------------------------------------------------------------
response_header(Header) ->
{true, httpify(Header)}.
request_header(Header) ->
{true, Header}.
response_default_headers() ->
[].
%%--------------------------------------------------------------------
%% Internal API -----------------------------------
%%--------------------------------------------------------------------
customize_headers(?MODULE, Function, Arg) ->
?MODULE:Function(Arg);
customize_headers(Module, Function, Arg) ->
try Module:Function(Arg) of
{true, Value} ->
?MODULE:Function(Value);
false ->
false
catch
_:_ ->
?MODULE:Function(Arg)
end.
response_default_headers(?MODULE) ->
response_default_headers();
response_default_headers(Module) ->
try Module:response_default_headers() of
Defaults ->
[{http_util:to_lower(Key), Value} || {Key, Value} <- Defaults,
is_list(Key), is_list(Value)]
catch
_:_ ->
?MODULE:response_default_headers()
end.
%%--------------------------------------------------------------------
%% Internal functions -----------------------------------
%%--------------------------------------------------------------------
httpify({Key0, Value}) ->
%% make sure first letter is capital (defacto standard)
Words1 = string:tokens(Key0, "-"),
Words2 = upify(Words1, []),
Key = new_key(Words2),
Key ++ ": " ++ Value ++ ?CRLF .
new_key([]) ->
"";
new_key([W]) ->
W;
new_key([W1,W2]) ->
W1 ++ "-" ++ W2;
new_key([W|R]) ->
W ++ "-" ++ new_key(R).
upify([], Acc) ->
lists:reverse(Acc);
upify([Key|Rest], Acc) ->
upify(Rest, [upify2(Key)|Acc]).
upify2([C|Rest]) when (C >= $a) andalso (C =< $z) ->
[C-($a-$A)|Rest];
upify2(Str) ->
Str.
