mirror of
https://github.com/ninenines/cowboy.git
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Add WebSocket drafts 7, 8, 9 and 10 implementation
The implementation is only partial for now but should work for all browsers implementing it.
This commit is contained in:
Loïc Hoguin
parent
24bf2c54d0
commit
2374aa7e07
4 changed files with 324 additions and 86 deletions
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@ -12,15 +12,29 @@
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%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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%% @doc WebSocket protocol draft hixie-76 implementation.
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%% @doc WebSocket protocol implementation.
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%%
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%% Known to work with the following browsers:
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%% Supports the protocol version 0 (hixie-76), version 7 (hybi-7)
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%% and version 8 (hybi-8, hybi-9 and hybi-10).
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%%
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%% Version 0 is supported by the following browsers:
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%% <ul>
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%% <li>Mozilla Firefox 4.0 (disabled by default)</li>
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%% <li>Google Chrome 6+</li>
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%% <li>Firefox 4-5 (disabled by default)</li>
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%% <li>Chrome 6-13</li>
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%% <li>Safari 5.0.1+</li>
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%% <li>Opera 11.00+ (disabled by default)</li>
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%% </ul>
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%%
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%% Version 7 is supported by the following browser:
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%% <ul>
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%% <li>Firefox 6</li>
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%% </ul>
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%%
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%% Version 8 is supported by the following browsers:
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%% <ul>
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%% <li>Firefox 7</li>
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%% <li>Chrome 14+</li>
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%% </ul>
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-module(cowboy_http_websocket).
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-export([upgrade/4]). %% API.
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@ -29,15 +43,19 @@
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-include("include/http.hrl").
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-include_lib("eunit/include/eunit.hrl").
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-type opcode() :: 0 | 1 | 2 | 8 | 9 | 10.
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-type mask_key() :: 0..16#ffffffff.
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-record(state, {
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version :: 0 | 7 | 8,
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handler :: module(),
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opts :: any(),
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origin = undefined :: undefined | binary(),
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challenge = undefined :: undefined | binary(),
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timeout = infinity :: timeout(),
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messages = undefined :: undefined | {atom(), atom(), atom()},
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eop :: tuple(),
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hibernate = false :: boolean()
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hibernate = false :: boolean(),
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eop :: undefined | tuple(), %% hixie-76 specific.
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origin = undefined :: undefined | binary() %% hixie-76 specific.
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}).
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%% @doc Upgrade a HTTP request to the WebSocket protocol.
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@ -48,35 +66,49 @@
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-spec upgrade(pid(), module(), any(), #http_req{}) -> ok.
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upgrade(ListenerPid, Handler, Opts, Req) ->
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cowboy_listener:move_connection(ListenerPid, websocket, self()),
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EOP = binary:compile_pattern(<< 255 >>),
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case catch websocket_upgrade(#state{handler=Handler, opts=Opts, eop=EOP}, Req) of
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case catch websocket_upgrade(#state{handler=Handler, opts=Opts}, Req) of
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{ok, State, Req2} -> handler_init(State, Req2);
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{'EXIT', _Reason} -> upgrade_error(Req)
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end.
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%% @todo We need a function to properly parse headers according to their ABNF,
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%% instead of having ugly code like this case here.
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-spec websocket_upgrade(#state{}, #http_req{}) -> {ok, #state{}, #http_req{}}.
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websocket_upgrade(State, Req) ->
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{<<"Upgrade">>, Req2} = cowboy_http_req:header('Connection', Req),
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{<<"WebSocket">>, Req3} = cowboy_http_req:header('Upgrade', Req2),
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{Origin, Req4} = cowboy_http_req:header(<<"Origin">>, Req3),
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{Key1, Req5} = cowboy_http_req:header(<<"Sec-Websocket-Key1">>, Req4),
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{Key2, Req6} = cowboy_http_req:header(<<"Sec-Websocket-Key2">>, Req5),
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case cowboy_http_req:header('Connection', Req) of
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{<<"Upgrade">>, Req2} -> ok;
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{<<"keep-alive, Upgrade">>, Req2} -> ok %% @todo Temp. For Firefox 6.
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end,
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{Version, Req3} = cowboy_http_req:header(<<"Sec-Websocket-Version">>, Req2),
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websocket_upgrade(Version, State, Req3).
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%% @todo Handle the Sec-Websocket-Protocol header.
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-spec websocket_upgrade(undefined | <<_:8>>, #state{}, #http_req{})
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-> {ok, #state{}, #http_req{}}.
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%% No version given. Assuming hixie-76 draft.
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%% @todo Check Origin?
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websocket_upgrade(undefined, State, Req) ->
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{<<"WebSocket">>, Req2} = cowboy_http_req:header('Upgrade', Req),
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{Origin, Req3} = cowboy_http_req:header(<<"Origin">>, Req2),
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{Key1, Req4} = cowboy_http_req:header(<<"Sec-Websocket-Key1">>, Req3),
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{Key2, Req5} = cowboy_http_req:header(<<"Sec-Websocket-Key2">>, Req4),
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false = lists:member(undefined, [Origin, Key1, Key2]),
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{ok, Key3, Req7} = cowboy_http_req:body(8, Req6),
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Challenge = challenge(Key1, Key2, Key3),
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{ok, State#state{origin=Origin, challenge=Challenge}, Req7}.
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-spec challenge(binary(), binary(), binary()) -> binary().
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challenge(Key1, Key2, Key3) ->
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IntKey1 = key_to_integer(Key1),
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IntKey2 = key_to_integer(Key2),
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erlang:md5(<< IntKey1:32, IntKey2:32, Key3/binary >>).
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-spec key_to_integer(binary()) -> integer().
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key_to_integer(Key) ->
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Number = list_to_integer([C || << C >> <= Key, C >= $0, C =< $9]),
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Spaces = length([C || << C >> <= Key, C =:= 32]),
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Number div Spaces.
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{ok, Key3, Req6} = cowboy_http_req:body(8, Req5),
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Challenge = hixie76_challenge(Key1, Key2, Key3),
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EOP = binary:compile_pattern(<< 255 >>),
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{ok, State#state{version=0, origin=Origin, challenge=Challenge,
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eop=EOP}, Req6};
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%% Versions 7 and 8. Implementation follows the hybi 7 through 10 drafts.
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%% @todo We don't need Origin?
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websocket_upgrade(<< Version >>, State, Req)
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when Version =:= $7; Version =:= $8 ->
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{<<"websocket">>, Req2} = cowboy_http_req:header('Upgrade', Req),
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{Origin, Req3} = cowboy_http_req:header(<<"Sec-Websocket-Origin">>, Req2),
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{Key, Req4} = cowboy_http_req:header(<<"Sec-Websocket-Key">>, Req3),
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false = lists:member(undefined, [Origin, Key]),
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Challenge = hybi_challenge(Key),
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{ok, State#state{version=Version - $0, origin=Origin,
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challenge=Challenge}, Req4}.
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-spec handler_init(#state{}, #http_req{}) -> ok.
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handler_init(State=#state{handler=Handler, opts=Opts},
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@ -103,35 +135,30 @@ upgrade_error(Req=#http_req{socket=Socket, transport=Transport}) ->
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Transport:close(Socket).
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-spec websocket_handshake(#state{}, #http_req{}, any()) -> ok.
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websocket_handshake(State=#state{origin=Origin, challenge=Challenge},
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Req=#http_req{transport=Transport, raw_host=Host, port=Port,
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raw_path=Path}, HandlerState) ->
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Location = websocket_location(Transport:name(), Host, Port, Path),
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websocket_handshake(State=#state{version=0, origin=Origin,
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challenge=Challenge}, Req=#http_req{transport=Transport,
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raw_host=Host, port=Port, raw_path=Path}, HandlerState) ->
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Location = hixie76_location(Transport:name(), Host, Port, Path),
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{ok, Req2} = cowboy_http_req:reply(
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<<"101 WebSocket Protocol Handshake">>,
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[{<<"Connection">>, <<"Upgrade">>},
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{<<"Upgrade">>, <<"WebSocket">>},
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{<<"Sec-WebSocket-Location">>, Location},
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{<<"Sec-WebSocket-Origin">>, Origin}],
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{<<"Sec-Websocket-Location">>, Location},
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{<<"Sec-Websocket-Origin">>, Origin}],
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Challenge, Req#http_req{resp_state=waiting}),
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handler_before_loop(State#state{messages=Transport:messages()},
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Req2, HandlerState, <<>>);
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websocket_handshake(State=#state{challenge=Challenge},
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Req=#http_req{transport=Transport}, HandlerState) ->
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{ok, Req2} = cowboy_http_req:reply(
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<<"101 Switching Protocols">>,
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[{<<"Connection">>, <<"Upgrade">>},
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{<<"Upgrade">>, <<"websocket">>},
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{<<"Sec-Websocket-Accept">>, Challenge}],
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[], Req#http_req{resp_state=waiting}),
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handler_before_loop(State#state{messages=Transport:messages()},
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Req2, HandlerState, <<>>).
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-spec websocket_location(atom(), binary(), inet:ip_port(), binary())
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-> binary().
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websocket_location(Protocol, Host, Port, Path) ->
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<< (websocket_location_protocol(Protocol))/binary, "://", Host/binary,
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(websocket_location_port(ssl, Port))/binary, Path/binary >>.
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-spec websocket_location_protocol(atom()) -> binary().
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websocket_location_protocol(ssl) -> <<"wss">>;
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websocket_location_protocol(_) -> <<"ws">>.
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-spec websocket_location_port(atom(), inet:ip_port()) -> binary().
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websocket_location_port(ssl, 443) -> <<"">>;
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websocket_location_port(_, 80) -> <<"">>;
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websocket_location_port(_, Port) -> <<":", (list_to_binary(integer_to_list(Port)))/binary>>.
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-spec handler_before_loop(#state{}, #http_req{}, any(), binary()) -> ok.
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handler_before_loop(State=#state{hibernate=true},
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Req=#http_req{socket=Socket, transport=Transport},
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@ -164,29 +191,118 @@ handler_loop(State=#state{messages={OK, Closed, Error}, timeout=Timeout},
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end.
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-spec websocket_data(#state{}, #http_req{}, any(), binary()) -> ok.
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websocket_data(State, Req, HandlerState, << 255, 0, _Rest/bits >>) ->
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websocket_close(State, Req, HandlerState, {normal, closed});
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%% No more data.
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websocket_data(State, Req, HandlerState, <<>>) ->
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handler_before_loop(State, Req, HandlerState, <<>>);
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websocket_data(State, Req, HandlerState, Data) ->
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websocket_frame(State, Req, HandlerState, Data, binary:first(Data)).
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%% We do not support any frame type other than 0 yet. Just like the specs.
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-spec websocket_frame(#state{}, #http_req{}, any(), binary(), byte()) -> ok.
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websocket_frame(State=#state{eop=EOP}, Req, HandlerState, Data, 0) ->
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%% hixie-76 close frame.
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websocket_data(State=#state{version=0}, Req, HandlerState,
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<< 255, 0, _Rest/bits >>) ->
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websocket_close(State, Req, HandlerState, {normal, closed});
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%% hixie-76 data frame. We only support the frame type 0, same as the specs.
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websocket_data(State=#state{version=0, eop=EOP}, Req, HandlerState,
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Data = << 0, _/bits >>) ->
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case binary:match(Data, EOP) of
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{Pos, 1} ->
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Pos2 = Pos - 1,
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<< 0, Frame:Pos2/binary, 255, Rest/bits >> = Data,
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<< 0, Payload:Pos2/binary, 255, Rest/bits >> = Data,
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handler_call(State, Req, HandlerState,
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Rest, websocket_handle, Frame, fun websocket_data/4);
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Rest, websocket_handle, {text, Payload}, fun websocket_data/4);
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nomatch ->
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%% @todo We probably should allow limiting frame length.
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handler_before_loop(State, Req, HandlerState, Data)
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end;
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websocket_frame(State, Req, HandlerState, _Data, _FrameType) ->
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%% hybi data frame.
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%% @todo Handle Fin.
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websocket_data(State=#state{version=Version}, Req, HandlerState, Data)
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when Version =/= 0 ->
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<< 1:1, 0:3, Opcode:4, Mask:1, PayloadLen:7, Rest/bits >> = Data,
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{PayloadLen2, Rest2} = case PayloadLen of
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126 -> << L:16, R/bits >> = Rest, {L, R};
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127 -> << 0:1, L:63, R/bits >> = Rest, {L, R};
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PayloadLen -> {PayloadLen, Rest}
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end,
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case {Mask, PayloadLen2} of
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{0, 0} ->
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websocket_dispatch(State, Req, HandlerState, Rest2, Opcode, <<>>);
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{1, N} when N + 4 < byte_size(Rest2) ->
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%% @todo We probably should allow limiting frame length.
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handler_before_loop(State, Req, HandlerState, Data);
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{1, _N} ->
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<< MaskKey:32, Payload:PayloadLen2/binary, Rest3/bits >> = Rest2,
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websocket_unmask(State, Req, HandlerState, Rest3,
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Opcode, Payload, MaskKey)
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end;
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%% Something was wrong with the frame. Close the connection.
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websocket_data(State, Req, HandlerState, _Bad) ->
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websocket_close(State, Req, HandlerState, {error, badframe}).
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%% hybi unmasking.
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-spec websocket_unmask(#state{}, #http_req{}, any(), binary(),
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opcode(), binary(), mask_key()) -> ok.
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, Payload, MaskKey) ->
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, Payload, MaskKey, <<>>).
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-spec websocket_unmask(#state{}, #http_req{}, any(), binary(),
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opcode(), binary(), mask_key(), binary()) -> ok.
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, << O:32, Rest/bits >>, MaskKey, Acc) ->
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T = O bxor MaskKey,
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, Rest, MaskKey, << Acc/binary, T:32 >>);
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, << O:24 >>, MaskKey, Acc) ->
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<< MaskKey2:24, _:8 >> = << MaskKey:32 >>,
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T = O bxor MaskKey2,
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websocket_dispatch(State, Req, HandlerState, RemainingData,
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Opcode, << Acc/binary, T:24 >>);
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, << O:16 >>, MaskKey, Acc) ->
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<< MaskKey2:16, _:16 >> = << MaskKey:32 >>,
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T = O bxor MaskKey2,
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websocket_dispatch(State, Req, HandlerState, RemainingData,
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Opcode, << Acc/binary, T:16 >>);
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, << O:8 >>, MaskKey, Acc) ->
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<< MaskKey2:8, _:24 >> = << MaskKey:32 >>,
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T = O bxor MaskKey2,
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websocket_dispatch(State, Req, HandlerState, RemainingData,
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Opcode, << Acc/binary, T:8 >>);
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websocket_unmask(State, Req, HandlerState, RemainingData,
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Opcode, <<>>, _MaskKey, Acc) ->
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websocket_dispatch(State, Req, HandlerState, RemainingData,
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Opcode, Acc).
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%% hybi dispatching.
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-spec websocket_dispatch(#state{}, #http_req{}, any(), binary(),
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opcode(), binary()) -> ok.
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%% @todo Fragmentation.
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%~ websocket_dispatch(State, Req, HandlerState, RemainingData, 0, Payload) ->
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%% Text frame.
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websocket_dispatch(State, Req, HandlerState, RemainingData, 1, Payload) ->
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handler_call(State, Req, HandlerState, RemainingData,
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websocket_handle, {text, Payload}, fun websocket_data/4);
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%% Binary frame.
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websocket_dispatch(State, Req, HandlerState, RemainingData, 2, Payload) ->
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handler_call(State, Req, HandlerState, RemainingData,
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websocket_handle, {binary, Payload}, fun websocket_data/4);
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%% Close control frame.
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%% @todo Handle the optional Payload.
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websocket_dispatch(State, Req, HandlerState, _RemainingData, 8, _Payload) ->
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websocket_close(State, Req, HandlerState, {normal, closed});
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%% Ping control frame. Send a pong back and forward the ping to the handler.
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websocket_dispatch(State, Req=#http_req{socket=Socket, transport=Transport},
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HandlerState, RemainingData, 9, Payload) ->
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Len = hybi_payload_length(byte_size(Payload)),
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Transport:send(Socket, << 1:1, 0:3, 10:4, 0:1, Len/bits, Payload/binary >>),
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handler_call(State, Req, HandlerState, RemainingData,
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websocket_handle, {ping, Payload}, fun websocket_data/4);
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%% Pong control frame.
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websocket_dispatch(State, Req, HandlerState, RemainingData, 10, Payload) ->
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handler_call(State, Req, HandlerState, RemainingData,
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websocket_handle, {pong, Payload}, fun websocket_data/4).
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-spec handler_call(#state{}, #http_req{}, any(), binary(),
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atom(), any(), fun()) -> ok.
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handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
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@ -197,11 +313,11 @@ handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
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{ok, Req2, HandlerState2, hibernate} ->
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NextState(State#state{hibernate=true},
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Req2, HandlerState2, RemainingData);
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{reply, Data, Req2, HandlerState2} ->
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websocket_send(Data, Req2),
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{reply, Payload, Req2, HandlerState2} ->
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websocket_send(Payload, State, Req2),
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NextState(State, Req2, HandlerState2, RemainingData);
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{reply, Data, Req2, HandlerState2, hibernate} ->
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websocket_send(Data, Req2),
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{reply, Payload, Req2, HandlerState2, hibernate} ->
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websocket_send(Payload, State, Req2),
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NextState(State#state{hibernate=true},
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Req2, HandlerState2, RemainingData);
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{shutdown, Req2, HandlerState2} ->
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@ -217,15 +333,37 @@ handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
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websocket_close(State, Req, HandlerState, {error, handler})
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end.
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-spec websocket_send(binary(), #http_req{}) -> ok.
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websocket_send(Data, #http_req{socket=Socket, transport=Transport}) ->
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Transport:send(Socket, << 0, Data/binary, 255 >>).
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-spec websocket_send(binary(), #state{}, #http_req{}) -> ok | ignore.
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%% hixie-76 text frame.
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websocket_send({text, Payload}, #state{version=0},
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#http_req{socket=Socket, transport=Transport}) ->
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Transport:send(Socket, << 0, Payload/binary, 255 >>);
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%% Ignore all unknown frame types for compatibility with hixie 76.
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websocket_send(_Any, #state{version=0}, _Req) ->
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ignore;
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websocket_send({Type, Payload}, _State,
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#http_req{socket=Socket, transport=Transport}) ->
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Opcode = case Type of
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text -> 1;
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binary -> 2;
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ping -> 9;
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pong -> 10
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end,
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Len = hybi_payload_length(byte_size(Payload)),
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Transport:send(Socket, << 1:1, 0:3, Opcode:4,
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0:1, Len/bits, Payload/binary >>).
|
||||
|
||||
-spec websocket_close(#state{}, #http_req{}, any(), {atom(), atom()}) -> ok.
|
||||
websocket_close(State, Req=#http_req{socket=Socket, transport=Transport},
|
||||
HandlerState, Reason) ->
|
||||
websocket_close(State=#state{version=0}, Req=#http_req{socket=Socket,
|
||||
transport=Transport}, HandlerState, Reason) ->
|
||||
Transport:send(Socket, << 255, 0 >>),
|
||||
Transport:close(Socket),
|
||||
handler_terminate(State, Req, HandlerState, Reason);
|
||||
%% @todo Send a Payload? Using Reason is usually good but we're quite careless.
|
||||
websocket_close(State, Req=#http_req{socket=Socket,
|
||||
transport=Transport}, HandlerState, Reason) ->
|
||||
Transport:send(Socket, << 1:1, 0:3, 8:4, 0:8 >>),
|
||||
Transport:close(Socket),
|
||||
handler_terminate(State, Req, HandlerState, Reason).
|
||||
|
||||
-spec handler_terminate(#state{}, #http_req{},
|
||||
|
|
@ -244,19 +382,67 @@ handler_terminate(#state{handler=Handler, opts=Opts},
|
|||
HandlerState, Req, erlang:get_stacktrace()])
|
||||
end.
|
||||
|
||||
%% hixie-76 specific.
|
||||
|
||||
-spec hixie76_challenge(binary(), binary(), binary()) -> binary().
|
||||
hixie76_challenge(Key1, Key2, Key3) ->
|
||||
IntKey1 = hixie76_key_to_integer(Key1),
|
||||
IntKey2 = hixie76_key_to_integer(Key2),
|
||||
erlang:md5(<< IntKey1:32, IntKey2:32, Key3/binary >>).
|
||||
|
||||
-spec hixie76_key_to_integer(binary()) -> integer().
|
||||
hixie76_key_to_integer(Key) ->
|
||||
Number = list_to_integer([C || << C >> <= Key, C >= $0, C =< $9]),
|
||||
Spaces = length([C || << C >> <= Key, C =:= 32]),
|
||||
Number div Spaces.
|
||||
|
||||
-spec hixie76_location(atom(), binary(), inet:ip_port(), binary())
|
||||
-> binary().
|
||||
hixie76_location(Protocol, Host, Port, Path) ->
|
||||
<< (hixie76_location_protocol(Protocol))/binary, "://", Host/binary,
|
||||
(hixie76_location_port(ssl, Port))/binary, Path/binary >>.
|
||||
|
||||
-spec hixie76_location_protocol(atom()) -> binary().
|
||||
hixie76_location_protocol(ssl) -> <<"wss">>;
|
||||
hixie76_location_protocol(_) -> <<"ws">>.
|
||||
|
||||
-spec hixie76_location_port(atom(), inet:ip_port()) -> binary().
|
||||
hixie76_location_port(ssl, 443) ->
|
||||
<<"">>;
|
||||
hixie76_location_port(_, 80) ->
|
||||
<<"">>;
|
||||
hixie76_location_port(_, Port) ->
|
||||
<<":", (list_to_binary(integer_to_list(Port)))/binary>>.
|
||||
|
||||
%% hybi specific.
|
||||
|
||||
-spec hybi_challenge(binary()) -> binary().
|
||||
hybi_challenge(Key) ->
|
||||
Bin = << Key/binary, "258EAFA5-E914-47DA-95CA-C5AB0DC85B11" >>,
|
||||
base64:encode(crypto:sha(Bin)).
|
||||
|
||||
-spec hybi_payload_length(0..16#7fffffffffffffff)
|
||||
-> << _:7 >> | << _:23 >> | << _:71 >>.
|
||||
hybi_payload_length(N) ->
|
||||
case N of
|
||||
N when N =< 125 -> << N:7 >>;
|
||||
N when N =< 16#ffff -> << 126:7, N:16 >>;
|
||||
N when N =< 16#7fffffffffffffff -> << 127:7, N:64 >>
|
||||
end.
|
||||
|
||||
%% Tests.
|
||||
|
||||
-ifdef(TEST).
|
||||
|
||||
websocket_location_test() ->
|
||||
hixie76_location_test() ->
|
||||
?assertEqual(<<"ws://localhost/path">>,
|
||||
websocket_location(other, <<"localhost">>, 80, <<"/path">>)),
|
||||
hixie76_location(other, <<"localhost">>, 80, <<"/path">>)),
|
||||
?assertEqual(<<"ws://localhost:8080/path">>,
|
||||
websocket_location(other, <<"localhost">>, 8080, <<"/path">>)),
|
||||
hixie76_location(other, <<"localhost">>, 8080, <<"/path">>)),
|
||||
?assertEqual(<<"wss://localhost/path">>,
|
||||
websocket_location(ssl, <<"localhost">>, 443, <<"/path">>)),
|
||||
hixie76_location(ssl, <<"localhost">>, 443, <<"/path">>)),
|
||||
?assertEqual(<<"wss://localhost:8443/path">>,
|
||||
websocket_location(ssl, <<"localhost">>, 8443, <<"/path">>)),
|
||||
hixie76_location(ssl, <<"localhost">>, 8443, <<"/path">>)),
|
||||
ok.
|
||||
|
||||
-endif.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue