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| author | Loïc Hoguin <[email protected]> | 2014-12-18 12:33:40 +0200 |
|---|---|---|
| committer | Loïc Hoguin <[email protected]> | 2014-12-18 13:23:18 +0200 |
| commit | bfa660285fe7babf7e6f334d6517e4d119bd3d10 (patch) | |
| tree | 5c162ba9cfafd190dd9458d10136a6e11bdf30c2 /src | |
| parent | 152db97abd9501df8edf72e1c7b7fed58d7fea34 (diff) | |
| download | cowlib-bfa660285fe7babf7e6f334d6517e4d119bd3d10.tar.gz cowlib-bfa660285fe7babf7e6f334d6517e4d119bd3d10.tar.bz2 cowlib-bfa660285fe7babf7e6f334d6517e4d119bd3d10.zip | |
Add cow_http_hd:parse_sec_websocket_version_client/1
From RFC6455.
The code is slower than a plain binary_to_integer(Version),
because it enforces that the value is in the 0..255 range as
per the specification, and that the input binary is no longer
than 3 characters.
It is however better to enforce this because the client could
also send a huge integer and we don't really want to convert it
and waste resources.
Diffstat (limited to 'src')
| -rw-r--r-- | src/cow_http_hd.erl | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/cow_http_hd.erl b/src/cow_http_hd.erl index b844de4..b1bafaa 100644 --- a/src/cow_http_hd.erl +++ b/src/cow_http_hd.erl @@ -31,6 +31,7 @@ -export([parse_if_unmodified_since/1]). -export([parse_last_modified/1]). -export([parse_max_forwards/1]). +-export([parse_sec_websocket_version_client/1]). -export([parse_transfer_encoding/1]). -export([parse_upgrade/1]). @@ -1293,6 +1294,50 @@ parse_max_forwards_error_test_() -> [{V, fun() -> {'EXIT', _} = (catch parse_content_length(V)) end} || V <- Tests]. -endif. +%% @doc Parse the Sec-WebSocket-Version request header. + +-spec parse_sec_websocket_version_client(binary()) -> 0..255. +parse_sec_websocket_version_client(SecWebSocketVersion) when byte_size(SecWebSocketVersion) < 4 -> + Version = binary_to_integer(SecWebSocketVersion), + true = Version >= 0 andalso Version =< 255, + Version. + +-ifdef(TEST). +prop_parse_sec_websocket_version_client() -> + ?FORALL(Version, + int(0, 255), + Version =:= parse_sec_websocket_version_client(integer_to_binary(Version))). + +parse_sec_websocket_version_client_test_() -> + Tests = [ + {<<"13">>, 13}, + {<<"25">>, 25} + ], + [{V, fun() -> R = parse_sec_websocket_version_client(V) end} || {V, R} <- Tests]. + +parse_sec_websocket_version_client_error_test_() -> + Tests = [ + <<>>, + <<" ">>, + <<"7, 8, 13">>, + <<"invalid">> + ], + [{V, fun() -> {'EXIT', _} = (catch parse_sec_websocket_version_client(V)) end} + || V <- Tests]. +-endif. + +-ifdef(PERF). +horse_parse_sec_websocket_version_client_13() -> + horse:repeat(200000, + parse_sec_websocket_version_client(<<"13">>) + ). + +horse_parse_sec_websocket_version_client_255() -> + horse:repeat(200000, + parse_sec_websocket_version_client(<<"255">>) + ). +-endif. + %% @doc Parse the Transfer-Encoding header. %% %% @todo This function does not support parsing of transfer-parameter. |