From 85f3208c34ef8774eeb0cc49576c82dd01b8d689 Mon Sep 17 00:00:00 2001
From: Andrei Nesterov <ae.nesterov@gmail.com>
Date: Sun, 6 Mar 2016 18:25:58 +0300
Subject: Add cow_http_hd:access_control_allow_headers/1

---
 src/cow_http_hd.erl | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/cow_http_hd.erl b/src/cow_http_hd.erl
index 6a7837b..0baacab 100644
--- a/src/cow_http_hd.erl
+++ b/src/cow_http_hd.erl
@@ -113,6 +113,7 @@
 
 %% Building.
 -export([access_control_allow_credentials/0]).
+-export([access_control_allow_headers/1]).
 
 -type etag() :: {weak | strong, binary()}.
 -export_type([etag/0]).
@@ -3222,6 +3223,34 @@ parse_x_forwarded_for_error_test_() ->
 -spec access_control_allow_credentials() -> iodata().
 access_control_allow_credentials() -> <<"true">>.
 
+%% @doc Build the Access-Control-Allow-Headers header.
+
+-spec access_control_allow_headers([binary()]) -> iodata().
+access_control_allow_headers(Headers) ->
+	join_token_list(nonempty(Headers)).
+
+-ifdef(TEST).
+access_control_allow_headers_test_() ->
+	Tests = [
+		{[<<"accept">>], <<"accept">>},
+		{[<<"accept">>, <<"authorization">>, <<"content-type">>], <<"accept, authorization, content-type">>}
+	],
+	[{lists:flatten(io_lib:format("~p", [V])),
+		fun() -> R = iolist_to_binary(access_control_allow_headers(V)) end} || {V, R} <- Tests].
+
+access_control_allow_headers_error_test_() ->
+	Tests = [
+		[]
+	],
+	[{lists:flatten(io_lib:format("~p", [V])),
+		fun() -> {'EXIT', _} = (catch access_control_allow_headers(V)) end} || V <- Tests].
+
+horse_access_control_allow_headers() ->
+	horse:repeat(200000,
+		access_control_allow_headers([<<"accept">>, <<"authorization">>, <<"content-type">>])
+	).
+-endif.
+
 %% Internal.
 
 %% Only return if the list is not empty.
-- 
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