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-rw-r--r--src/cowboy_bstr.erl49
1 files changed, 46 insertions, 3 deletions
diff --git a/src/cowboy_bstr.erl b/src/cowboy_bstr.erl
index e906de7..bc6818f 100644
--- a/src/cowboy_bstr.erl
+++ b/src/cowboy_bstr.erl
@@ -16,16 +16,40 @@
-module(cowboy_bstr).
%% Binary strings.
+-export([capitalize_token/1]).
-export([to_lower/1]).
%% Characters.
-export([char_to_lower/1]).
-export([char_to_upper/1]).
+-ifdef(TEST).
+-include_lib("eunit/include/eunit.hrl").
+-endif.
+
+%% @doc Capitalize a token.
+%%
+%% The first letter and all letters after a dash are capitalized.
+%% This is the form seen for header names in the HTTP/1.1 RFC and
+%% others. Note that using this form isn't required, as header name
+%% are case insensitive, and it is only provided for use with eventual
+%% badly implemented clients.
+-spec capitalize_token(B) -> B when B::binary().
+capitalize_token(B) ->
+ capitalize_token(B, true, <<>>).
+capitalize_token(<<>>, _, Acc) ->
+ Acc;
+capitalize_token(<< $-, Rest/bits >>, _, Acc) ->
+ capitalize_token(Rest, true, << Acc/binary, $- >>);
+capitalize_token(<< C, Rest/bits >>, true, Acc) ->
+ capitalize_token(Rest, false, << Acc/binary, (char_to_upper(C)) >>);
+capitalize_token(<< C, Rest/bits >>, false, Acc) ->
+ capitalize_token(Rest, false, << Acc/binary, (char_to_lower(C)) >>).
+
%% @doc Convert a binary string to lowercase.
--spec to_lower(binary()) -> binary().
-to_lower(L) ->
- << << (char_to_lower(C)) >> || << C >> <= L >>.
+-spec to_lower(B) -> B when B::binary().
+to_lower(B) ->
+ << << (char_to_lower(C)) >> || << C >> <= B >>.
%% @doc Convert [A-Z] characters to lowercase.
%% @end
@@ -88,3 +112,22 @@ char_to_upper($x) -> $X;
char_to_upper($y) -> $Y;
char_to_upper($z) -> $Z;
char_to_upper(Ch) -> Ch.
+
+%% Tests.
+
+-ifdef(TEST).
+
+capitalize_token_test_() ->
+ %% {Header, Result}
+ Tests = [
+ {<<"heLLo-woRld">>, <<"Hello-World">>},
+ {<<"Sec-Websocket-Version">>, <<"Sec-Websocket-Version">>},
+ {<<"Sec-WebSocket-Version">>, <<"Sec-Websocket-Version">>},
+ {<<"sec-websocket-version">>, <<"Sec-Websocket-Version">>},
+ {<<"SEC-WEBSOCKET-VERSION">>, <<"Sec-Websocket-Version">>},
+ {<<"Sec-WebSocket--Version">>, <<"Sec-Websocket--Version">>},
+ {<<"Sec-WebSocket---Version">>, <<"Sec-Websocket---Version">>}
+ ],
+ [{H, fun() -> R = capitalize_token(H) end} || {H, R} <- Tests].
+
+-endif.