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%%%---------------------------------------------------------------------- | ||
%%% File : yaws_websockets.erl | ||
%%% Author : Davide Marquês <nesrait@gmail.com> | ||
%%% Purpose : | ||
%%% Created : 18 Dec 2009 by Davide Marquês <nesrait@gmail.com> | ||
%%% Modified: | ||
%%%---------------------------------------------------------------------- | ||
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-module(yaws_websockets). | ||
-author('nesrait@gmail.com'). | ||
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-include("../include/yaws.hrl"). | ||
-include("../include/yaws_api.hrl"). | ||
-include("yaws_debug.hrl"). | ||
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-include_lib("kernel/include/file.hrl"). | ||
-export([handshake/3, unframe_one/1, unframe_all/2]). | ||
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handshake(Arg, ContentPid, SocketMode) -> | ||
CliSock = Arg#arg.clisock, | ||
case get_origin_header(Arg#arg.headers) of | ||
undefined -> | ||
%% Yaws will take care of closing the socket | ||
ContentPid ! discard; | ||
Origin -> | ||
Host = (Arg#arg.headers)#headers.host, | ||
{abs_path, Path} = (Arg#arg.req)#http_request.path, | ||
%% TODO: Support for wss:// | ||
WebSocketLocation = "ws://" ++ Host ++ Path, | ||
Handshake = | ||
["HTTP/1.1 101 Web Socket Protocol Handshake\r\n", | ||
"Upgrade: WebSocket\r\n", | ||
"Connection: Upgrade\r\n", | ||
"WebSocket-Origin: ", Origin, "\r\n", | ||
"WebSocket-Location: ", WebSocketLocation, "\r\n", | ||
"\r\n"], | ||
SC = get(sc), | ||
case SC#sconf.ssl of | ||
undefined -> | ||
gen_tcp:send(CliSock, Handshake), | ||
inet:setopts(CliSock, [{packet, raw}, {active, SocketMode}]), | ||
TakeOverResult = | ||
gen_tcp:controlling_process(CliSock, ContentPid); | ||
_ -> | ||
ssl:send(CliSock, Handshake), | ||
ssl:setopts(CliSock, [{packet, raw}, {active, SocketMode}]), | ||
TakeOverResult = | ||
ssl:controlling_process(CliSock, ContentPid) | ||
end, | ||
case TakeOverResult of | ||
ok -> | ||
%% Make sure that Yaws doesn't close the socket! | ||
put(outh, (get(outh))#outh{doclose = false}), | ||
ContentPid ! {ok, CliSock}; | ||
{error, Reason} -> | ||
ContentPid ! discard, | ||
exit({websocket, Reason}) | ||
end | ||
end, | ||
exit(normal). | ||
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%% This should take care of all the Data Framing scenarios specified in | ||
%% http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-66#page-26 | ||
unframe_one(DataFrames) -> | ||
<<Type, _/bitstring>> = DataFrames, | ||
case Type of | ||
T when (T =< 127) -> | ||
%% {ok, FF_Ended_Frame} = re:compile("^.(.*)\\xFF(.*?)", [ungreedy]), | ||
FF_Ended_Frame = {re_pattern,2,0, | ||
<<69,82,67,80,71,0,0,0,16,2,0,0,5,0,0,0,2,0,0,0,0,0,255,2,40, | ||
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,93,0,27,25,12,94,0,7,0,1,57, | ||
12,84,0,7,27,255,94,0,7,0,2,56,12,84,0,7,84,0,27,0>>}, | ||
{match, [Data, NextFrame]} = | ||
re:run(DataFrames, FF_Ended_Frame, | ||
[{capture, all_but_first, binary}]), | ||
{ok, Data, NextFrame}; | ||
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_ -> %% Type band 16#80 =:= 16#80 | ||
{Length, LenBytes} = unpack_length(DataFrames, 0, 0), | ||
<<_, _:LenBytes/bytes, Data:Length/bytes, | ||
NextFrame/bitstring>> = DataFrames, | ||
{ok, Data, NextFrame} | ||
end. | ||
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unframe_all(<<>>, Acc) -> | ||
lists:reverse(Acc); | ||
unframe_all(DataFramesBin, Acc) -> | ||
{ok, Msg, Rem} = unframe_one(DataFramesBin), | ||
unframe_all(Rem, [Msg|Acc]). | ||
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%% Internal functions | ||
get_origin_header(#headers{other=L}) -> | ||
lists:foldl(fun({http_header,_,K0,_,V}, undefined) -> | ||
K = case is_atom(K0) of | ||
true -> | ||
atom_to_list(K0); | ||
false -> | ||
K0 | ||
end, | ||
case string:to_lower(K) of | ||
"origin" -> | ||
V; | ||
_ -> | ||
undefined | ||
end; | ||
(_, Acc) -> | ||
Acc | ||
end, undefined, L). | ||
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unpack_length(Binary, LenBytes, Length) -> | ||
<<_, _:LenBytes/bytes, B, _/bitstring>> = Binary, | ||
B_v = B band 16#7F, | ||
NewLength = (Length * 128) + B_v, | ||
case B band 16#80 of | ||
16#80 -> | ||
unpack_length(Binary, LenBytes + 1, NewLength); | ||
0 -> | ||
{NewLength, LenBytes + 1} | ||
end. | ||
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<erl> | ||
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out(A) -> | ||
case get_upgrade_header(A#arg.headers) of | ||
undefined -> | ||
serve_html_page(A); | ||
"WebSocket" -> | ||
WebSocketOwner = spawn(fun() -> websocket_owner() end), | ||
{websocket, WebSocketOwner, passive} | ||
end. | ||
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websocket_owner() -> | ||
receive | ||
{ok, WebSocket} -> | ||
%% This is how we read messages (plural!!) from websockets on passive mode | ||
case yaws_api:websocket_receive(WebSocket) of | ||
{error,closed} -> | ||
io:format("The websocket got disconnected right from the start. " | ||
"This wasn't supposed to happen!!~n"); | ||
{ok, Messages} -> | ||
case Messages of | ||
[<<"client-connected">>] -> | ||
yaws_api:websocket_setopts(WebSocket, [{active, true}]), | ||
echo_server(WebSocket); | ||
Other -> | ||
io:format("websocket_owner got: ~p. Terminating~n", [Other]) | ||
end | ||
end; | ||
_ -> ok | ||
end. | ||
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echo_server(WebSocket) -> | ||
receive | ||
{tcp, WebSocket, DataFrame} -> | ||
Data = yaws_api:websocket_unframe_data(DataFrame), | ||
io:format("Got data from Websocket: ~p~n", [Data]), | ||
yaws_api:websocket_send(WebSocket, Data), | ||
echo_server(WebSocket); | ||
{tcp_closed, WebSocket} -> | ||
io:format("Websocket closed. Terminating echo_server...~n"); | ||
Any -> | ||
io:format("echo_server received msg:~p~n", [Any]), | ||
echo_server(WebSocket) | ||
end. | ||
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get_upgrade_header(#headers{other=L}) -> | ||
lists:foldl(fun({http_header,_,K0,_,V}, undefined) -> | ||
K = case is_atom(K0) of | ||
true -> | ||
atom_to_list(K0); | ||
false -> | ||
K0 | ||
end, | ||
case string:to_lower(K) of | ||
"upgrade" -> | ||
V; | ||
_ -> | ||
undefined | ||
end; | ||
(_, Acc) -> | ||
Acc | ||
end, undefined, L). | ||
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serve_html_page(A) -> | ||
Host = (A#arg.headers)#headers.host, | ||
{abs_path, Path} = (A#arg.req)#http_request.path, | ||
WebSocketLocation = Host ++ Path, | ||
io:format("WebSocketLocation: ~p ~n", [WebSocketLocation]), | ||
Body = html_body(WebSocketLocation), | ||
{content, "text/html", Body}. | ||
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%% this html was copied from the basic example in | ||
%% http://github.com/davebryson/erlang_websocket/ | ||
html_body(WebSocketLocation) -> | ||
"<html> | ||
<head> | ||
<title>Basic WebSocket Example</title> | ||
<script type=\"text/javascript\"> | ||
if (!window.WebSocket) | ||
alert(\"WebSocket not supported by this browser\"); | ||
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// Get an Element | ||
function $() { return document.getElementById(arguments[0]); } | ||
// Get the value of an Element | ||
function $F() { return document.getElementById(arguments[0]).value; } | ||
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var client = { | ||
connect: function(){ | ||
this._ws=new WebSocket(\"ws://" ++ WebSocketLocation ++ "\"); | ||
this._ws.onopen=this._onopen; | ||
this._ws.onmessage=this._onmessage; | ||
this._ws.onclose=this._onclose; | ||
}, | ||
_onopen: function(){ | ||
$('connect').className='hidden'; | ||
$('connected').className=''; | ||
$('phrase').focus(); | ||
client._send('client-connected'); | ||
}, | ||
_send: function(message){ | ||
if (this._ws) | ||
this._ws.send(message); | ||
}, | ||
chat: function(text) { | ||
if (text != null && text.length>0 ) | ||
client._send(text); | ||
}, | ||
_onmessage: function(m) { | ||
if (m.data){ | ||
var text = m.data; | ||
var msg=$('msgs'); | ||
var spanText = document.createElement('span'); | ||
spanText.className='text'; | ||
spanText.innerHTML=text; | ||
var lineBreak = document.createElement('br'); | ||
msg.appendChild(spanText); | ||
msg.appendChild(lineBreak); | ||
msg.scrollTop = msg.scrollHeight - msg.clientHeight; | ||
} | ||
}, | ||
_onclose: function(m) { | ||
this._ws=null; | ||
$('connect').className=''; | ||
$('connected').className='hidden'; | ||
$('msg').innerHTML=''; | ||
} | ||
}; | ||
</script> | ||
<style type='text/css'> | ||
div.hidden { display: none; } | ||
</style> | ||
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</head> | ||
<body> | ||
<h1>Basic Echo Example</h1> | ||
<div id=\"msgs\"></div> | ||
<div id=\"connect\"> | ||
<input id='cA' class='button' type='submit' name='connect' value='Connect'/> | ||
</div> | ||
<br/> | ||
<div id=\"connected\" class=\"hidden\"> | ||
Say Something: <input id='phrase' type='text'/> | ||
<input id='sendB' class='button' type='submit' name='connect' value='Send'/> | ||
</div> | ||
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<script type='text/javascript'> | ||
$('cA').onclick = function(event) { client.connect(); return false; }; | ||
$('sendB').onclick = function(event) { client.chat($F('phrase')); $('phrase').value=''; return false; }; | ||
</script> | ||
</body> | ||
</html>". | ||
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</erl> | ||
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