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-rw-r--r--src/cow_http_hd.erl29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/cow_http_hd.erl b/src/cow_http_hd.erl
index 8e258f9..4207b19 100644
--- a/src/cow_http_hd.erl
+++ b/src/cow_http_hd.erl
@@ -116,6 +116,7 @@
-export([access_control_allow_headers/1]).
-export([access_control_allow_methods/1]).
-export([access_control_allow_origin/1]).
+-export([access_control_expose_headers/1]).
-type etag() :: {weak | strong, binary()}.
-export_type([etag/0]).
@@ -3315,6 +3316,34 @@ horse_access_control_allow_origin() ->
).
-endif.
+%% @doc Build the Access-Control-Expose-Headers header.
+
+-spec access_control_expose_headers([binary()]) -> iodata().
+access_control_expose_headers(Headers) ->
+ join_token_list(nonempty(Headers)).
+
+-ifdef(TEST).
+access_control_expose_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_expose_headers(V)) end} || {V, R} <- Tests].
+
+access_control_expose_headers_error_test_() ->
+ Tests = [
+ []
+ ],
+ [{lists:flatten(io_lib:format("~p", [V])),
+ fun() -> {'EXIT', _} = (catch access_control_expose_headers(V)) end} || V <- Tests].
+
+horse_access_control_expose_headers() ->
+ horse:repeat(200000,
+ access_control_expose_headers([<<"accept">>, <<"authorization">>, <<"content-type">>])
+ ).
+-endif.
+
%% Internal.
%% Only return if the list is not empty.