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% 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.
-module(chttpd_prefer_header).
-compile(tuple_calls).
-export([
maybe_return_minimal/2
]).
-include_lib("couch/include/couch_db.hrl").
maybe_return_minimal(#httpd{mochi_req = MochiReq}, Headers) ->
case get_prefer_header(MochiReq) of
"return=minimal" ->
filter_headers(Headers, get_header_list());
_ ->
Headers
end.
get_prefer_header(Req) ->
case Req:get_header_value("Prefer") of
Value when is_list(Value) ->
string:to_lower(Value);
undefined ->
undefined
end.
filter_headers(Headers, IncludeList) ->
lists:filter(fun({HeaderName, _}) ->
lists:member(HeaderName, IncludeList)
end, Headers).
get_header_list() ->
SectionStr = config:get("chttpd", "prefer_minimal", ""),
split_list(SectionStr).
split_list(S) ->
re:split(S, "\\s*,\\s*", [trim, {return, list}]).
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