%% Copyright (c) 2014-2019, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(gun_http).
-export([check_options/1]).
-export([name/0]).
-export([init/4]).
-export([handle/4]).
-export([close/4]).
-export([keepalive/1]).
-export([headers/10]).
-export([request/11]).
-export([data/7]).
-export([connect/5]).
-export([cancel/5]).
-export([stream_info/2]).
-export([down/1]).
-export([ws_upgrade/9]).
%% Functions shared with gun_http2.
-export([host_header/3]).
-type io() :: head | {body, non_neg_integer()} | body_close | body_chunked | body_trailer.
%% @todo Make that a record.
-type connect_info() :: {connect, reference(), gun:connect_destination()}.
%% @todo Make that a record.
-type websocket_info() :: {websocket, reference(), binary(), [binary()], gun:ws_opts()}. %% key, extensions, options
-record(stream, {
ref :: reference() | connect_info() | websocket_info(),
reply_to :: pid(),
method :: binary(),
is_alive :: boolean(),
handler_state :: undefined | gun_content_handler:state()
}).
-record(http_state, {
owner :: pid(),
socket :: inet:socket() | ssl:sslsocket(),
transport :: module(),
version = 'HTTP/1.1' :: cow_http:version(),
content_handlers :: gun_content_handler:opt(),
connection = keepalive :: keepalive | close,
buffer = <<>> :: binary(),
streams = [] :: [#stream{}],
in = head :: io(),
in_state = {0, 0} :: {non_neg_integer(), non_neg_integer()},
out = head :: io(),
transform_header_name :: fun((binary()) -> binary())
}).
check_options(Opts) ->
do_check_options(maps:to_list(Opts)).
do_check_options([]) ->
ok;
do_check_options([Opt={content_handlers, Handlers}|Opts]) ->
case gun_content_handler:check_option(Handlers) of
ok -> do_check_options(Opts);
error -> {error, {options, {http, Opt}}}
end;
do_check_options([{keepalive, infinity}|Opts]) ->
do_check_options(Opts);
do_check_options([{keepalive, K}|Opts]) when is_integer(K), K > 0 ->
do_check_options(Opts);
do_check_options([{transform_header_name, F}|Opts]) when is_function(F) ->
do_check_options(Opts);
do_check_options([{version, V}|Opts]) when V =:= 'HTTP/1.1'; V =:= 'HTTP/1.0' ->
do_check_options(Opts);
do_check_options([Opt|_]) ->
{error, {options, {http, Opt}}}.
name() -> http.
init(Owner, Socket, Transport, Opts) ->
Version = maps:get(version, Opts, 'HTTP/1.1'),
Handlers = maps:get(content_handlers, Opts, [gun_data_h]),
TransformHeaderName = maps:get(transform_header_name, Opts, fun (N) -> N end),
#http_state{owner=Owner, socket=Socket, transport=Transport, version=Version,
content_handlers=Handlers, transform_header_name=TransformHeaderName}.
%% Stop looping when we got no more data.
handle(<<>>, State, _, EvHandlerState) ->
{{state, State}, EvHandlerState};
%% Close when server responds and we don't have any open streams.
handle(_, #http_state{streams=[]}, _, EvHandlerState) ->
{close, EvHandlerState};
%% Wait for the full response headers before trying to parse them.
handle(Data, State=#http_state{in=head, buffer=Buffer,
streams=[#stream{ref=StreamRef, reply_to=ReplyTo}|_]}, EvHandler, EvHandlerState0) ->
%% Send the event only if there was no data in the buffer.
%% If there is data in the buffer then we already sent the event.
EvHandlerState = case Buffer of
<<>> ->
EvHandler:response_start(#{
stream_ref => stream_ref(StreamRef),
reply_to => ReplyTo
}, EvHandlerState0);
_ ->
EvHandlerState0
end,
Data2 = << Buffer/binary, Data/binary >>,
case binary:match(Data2, <<"\r\n\r\n">>) of
nomatch -> {{state, State#http_state{buffer=Data2}}, EvHandlerState};
{_, _} -> handle_head(Data2, State#http_state{buffer= <<>>}, EvHandler, EvHandlerState)
end;
%% Everything sent to the socket until it closes is part of the response body.
handle(Data, State=#http_state{in=body_close}, _, EvHandlerState) ->
{{state, send_data_if_alive(Data, State, nofin)}, EvHandlerState};
%% Chunked transfer-encoding may contain both data and trailers.
handle(Data, State=#http_state{in=body_chunked, in_state=InState,
buffer=Buffer, streams=[#stream{ref=StreamRef, reply_to=ReplyTo}|_],
connection=Conn}, EvHandler, EvHandlerState0) ->
Buffer2 = << Buffer/binary, Data/binary >>,
case cow_http_te:stream_chunked(Buffer2, InState) of
more ->
{{state, State#http_state{buffer=Buffer2}}, EvHandlerState0};
{more, Data2, InState2} ->
{{state, send_data_if_alive(Data2,
State#http_state{buffer= <<>>, in_state=InState2},
nofin)}, EvHandlerState0};
{more, Data2, Length, InState2} when is_integer(Length) ->
%% @todo See if we can recv faster than one message at a time.
{{state, send_data_if_alive(Data2,
State#http_state{buffer= <<>>, in_state=InState2},
nofin)}, EvHandlerState0};
{more, Data2, Rest, InState2} ->
%% @todo See if we can recv faster than one message at a time.
{{state, send_data_if_alive(Data2,
State#http_state{buffer=Rest, in_state=InState2},
nofin)}, EvHandlerState0};
{done, HasTrailers, Rest} ->
%% @todo response_end should be called AFTER send_data_if_alive
{IsFin, EvHandlerState} = case HasTrailers of
trailers ->
{nofin, EvHandlerState0};
no_trailers ->
EvHandlerState1 = EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState0),
{fin, EvHandlerState1}
end,
%% I suppose it doesn't hurt to append an empty binary.
State1 = send_data_if_alive(<<>>, State, IsFin),
case {HasTrailers, Conn} of
{trailers, _} ->
handle(Rest, State1#http_state{buffer = <<>>, in=body_trailer}, EvHandler, EvHandlerState);
{no_trailers, keepalive} ->
handle(Rest, end_stream(State1#http_state{buffer= <<>>}), EvHandler, EvHandlerState);
{no_trailers, close} ->
{[{state, end_stream(State1)}, close], EvHandlerState}
end;
{done, Data2, HasTrailers, Rest} ->
%% @todo response_end should be called AFTER send_data_if_alive
{IsFin, EvHandlerState} = case HasTrailers of
trailers ->
{nofin, EvHandlerState0};
no_trailers ->
EvHandlerState1 = EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState0),
{fin, EvHandlerState1}
end,
State1 = send_data_if_alive(Data2, State, IsFin),
case {HasTrailers, Conn} of
{trailers, _} ->
handle(Rest, State1#http_state{buffer = <<>>, in=body_trailer}, EvHandler, EvHandlerState);
{no_trailers, keepalive} ->
handle(Rest, end_stream(State1#http_state{buffer= <<>>}), EvHandler, EvHandlerState);
{no_trailers, close} ->
{[{state, end_stream(State1)}, close], EvHandlerState}
end
end;
handle(Data, State=#http_state{in=body_trailer, buffer=Buffer, connection=Conn,
streams=[#stream{ref=StreamRef, reply_to=ReplyTo}|_]}, EvHandler, EvHandlerState0) ->
Data2 = << Buffer/binary, Data/binary >>,
case binary:match(Data2, <<"\r\n\r\n">>) of
nomatch ->
{{state, State#http_state{buffer=Data2}}, EvHandlerState0};
{_, _} ->
{Trailers, Rest} = cow_http:parse_headers(Data2),
%% @todo We probably want to pass this to gun_content_handler?
ReplyTo ! {gun_trailers, self(), stream_ref(StreamRef), Trailers},
ResponseEvent = #{
stream_ref => StreamRef,
reply_to => ReplyTo
},
EvHandlerState1 = EvHandler:response_trailers(ResponseEvent#{headers => Trailers}, EvHandlerState0),
EvHandlerState = EvHandler:response_end(ResponseEvent, EvHandlerState1),
case Conn of
keepalive ->
handle(Rest, end_stream(State#http_state{buffer= <<>>}), EvHandler, EvHandlerState);
close ->
{[{state, end_stream(State)}, close], EvHandlerState}
end
end;
%% We know the length of the rest of the body.
handle(Data, State=#http_state{in={body, Length}, connection=Conn,
streams=[#stream{ref=StreamRef, reply_to=ReplyTo}|_]},
EvHandler, EvHandlerState0) ->
DataSize = byte_size(Data),
if
%% More data coming.
DataSize < Length ->
{{state, send_data_if_alive(Data,
State#http_state{in={body, Length - DataSize}},
nofin)}, EvHandlerState0};
%% Stream finished, no rest.
DataSize =:= Length ->
State1 = send_data_if_alive(Data, State, fin),
EvHandlerState = EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState0),
case Conn of
keepalive -> {{state, end_stream(State1)}, EvHandlerState};
close -> {[{state, end_stream(State1)}, close], EvHandlerState}
end;
%% Stream finished, rest.
true ->
<< Body:Length/binary, Rest/bits >> = Data,
State1 = send_data_if_alive(Body, State, fin),
EvHandlerState = EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState0),
case Conn of
keepalive -> handle(Rest, end_stream(State1), EvHandler, EvHandlerState);
close -> {[{state, end_stream(State1)}, close], EvHandlerState}
end
end.
handle_head(Data, State=#http_state{socket=Socket, transport=Transport,
version=ClientVersion, content_handlers=Handlers0, connection=Conn,
streams=[Stream=#stream{ref=StreamRef, reply_to=ReplyTo,
method=Method, is_alive=IsAlive}|Tail]},
EvHandler, EvHandlerState0) ->
{Version, Status, _, Rest} = cow_http:parse_status_line(Data),
{Headers, Rest2} = cow_http:parse_headers(Rest),
case {Status, StreamRef} of
{101, {websocket, RealStreamRef, WsKey, WsExtensions, WsOpts}} ->
EvHandlerState = EvHandler:response_inform(#{
stream_ref => RealStreamRef,
reply_to => ReplyTo,
status => 101,
headers => Headers
}, EvHandlerState0),
{ws_handshake(Rest2, State, RealStreamRef, Headers, WsKey, WsExtensions, WsOpts),
EvHandlerState};
%% @todo If the stream is cancelled we probably shouldn't finish the CONNECT setup.
{_, {connect, RealStreamRef, Destination}} when Status >= 200, Status < 300 ->
case IsAlive of
false ->
ok;
true ->
ReplyTo ! {gun_response, self(), RealStreamRef,
fin, Status, Headers},
ok
end,
%% @todo Figure out whether the event should trigger if the stream was cancelled.
EvHandlerState1 = EvHandler:response_headers(#{
stream_ref => RealStreamRef,
reply_to => ReplyTo,
status => Status,
headers => Headers
}, EvHandlerState0),
%% We expect there to be no additional data after the CONNECT response.
<<>> = Rest2,
State2 = end_stream(State#http_state{streams=[Stream|Tail]}),
NewHost = maps:get(host, Destination),
NewPort = maps:get(port, Destination),
case Destination of
#{transport := tls} when Transport =:= gun_tls ->
TLSOpts = maps:get(tls_opts, Destination, []),
TLSTimeout = maps:get(tls_handshake_timeout, Destination, infinity),
{ok, ProxyPid} = gun_tls_proxy:start_link(NewHost, NewPort,
TLSOpts, TLSTimeout, Socket, gun_tls),
%% In this case the switch_protocol is delayed and is handled by
%% a message sent from gun_tls_proxy once the connection is established,
%% and handled by the gun module directly.
{[{state, State2#http_state{socket=ProxyPid, transport=gun_tls_proxy}},
{origin, <<"https">>, NewHost, NewPort, connect},
{switch_transport, gun_tls_proxy, ProxyPid}], EvHandlerState1};
#{transport := tls} ->
TLSOpts = maps:get(tls_opts, Destination, []),
TLSTimeout = maps:get(tls_handshake_timeout, Destination, infinity),
HandshakeEvent = #{
stream_ref => RealStreamRef,
reply_to => ReplyTo,
socket => Socket,
tls_opts => TLSOpts,
timeout => TLSTimeout
},
EvHandlerState2 = EvHandler:tls_handshake_start(HandshakeEvent, EvHandlerState1),
case gun_tls:connect(Socket, TLSOpts, TLSTimeout) of
{ok, TLSSocket} ->
Protocol = case ssl:negotiated_protocol(TLSSocket) of
{ok, <<"h2">>} -> gun_http2;
_ -> gun_http
end,
EvHandlerState = EvHandler:tls_handshake_end(HandshakeEvent#{
socket => TLSSocket,
protocol => Protocol:name()
}, EvHandlerState2),
case Protocol of
gun_http2 ->
{[{origin, <<"https">>, NewHost, NewPort, connect},
{switch_transport, gun_tls, TLSSocket},
{switch_protocol, gun_http2, State2}], EvHandlerState};
gun_http ->
{[{state, State2#http_state{socket=TLSSocket, transport=gun_tls}},
{origin, <<"https">>, NewHost, NewPort, connect},
{switch_transport, gun_tls, TLSSocket}], EvHandlerState}
end;
Error = {error, Reason} ->
EvHandlerState = EvHandler:tls_handshake_end(HandshakeEvent#{
error => Reason
}, EvHandlerState2),
{Error, EvHandlerState}
end;
_ ->
case maps:get(protocols, Destination, [http]) of
[http] ->
{[{state, State2},
{origin, <<"http">>, NewHost, NewPort, connect}], EvHandlerState1};
[http2] ->
{[{origin, <<"http">>, NewHost, NewPort, connect},
{switch_protocol, gun_http2, State2}], EvHandlerState1}
end
end;
{_, _} when Status >= 100, Status =< 199 ->
ReplyTo ! {gun_inform, self(), stream_ref(StreamRef), Status, Headers},
EvHandlerState = EvHandler:response_inform(#{
stream_ref => StreamRef,
reply_to => ReplyTo,
status => Status,
headers => Headers
}, EvHandlerState0),
handle(Rest2, State, EvHandler, EvHandlerState);
_ ->
In = response_io_from_headers(Method, Version, Status, Headers),
IsFin = case In of head -> fin; _ -> nofin end,
%% @todo Figure out whether the event should trigger if the stream was cancelled.
{Handlers, EvHandlerState2} = case IsAlive of
false ->
{undefined, EvHandlerState0};
true ->
ReplyTo ! {gun_response, self(), stream_ref(StreamRef),
IsFin, Status, Headers},
EvHandlerState1 = EvHandler:response_headers(#{
stream_ref => StreamRef,
reply_to => ReplyTo,
status => Status,
headers => Headers
}, EvHandlerState0),
case IsFin of
fin -> {undefined, EvHandlerState1};
nofin ->
{gun_content_handler:init(ReplyTo, stream_ref(StreamRef),
Status, Headers, Handlers0), EvHandlerState1}
end
end,
EvHandlerState = case IsFin of
nofin ->
EvHandlerState2;
fin ->
EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState2)
end,
Conn2 = if
Conn =:= close -> close;
Version =:= 'HTTP/1.0' -> close;
ClientVersion =:= 'HTTP/1.0' -> close;
true -> conn_from_headers(Version, Headers)
end,
%% We always reset in_state even if not chunked.
if
IsFin =:= fin, Conn2 =:= close ->
{close, EvHandlerState};
IsFin =:= fin ->
handle(Rest2, end_stream(State#http_state{in=In,
in_state={0, 0}, connection=Conn2,
streams=[Stream#stream{handler_state=Handlers}|Tail]}),
EvHandler, EvHandlerState);
true ->
handle(Rest2, State#http_state{in=In,
in_state={0, 0}, connection=Conn2,
streams=[Stream#stream{handler_state=Handlers}|Tail]},
EvHandler, EvHandlerState)
end
end.
stream_ref({connect, StreamRef, _}) -> StreamRef;
stream_ref({websocket, StreamRef, _, _, _}) -> StreamRef;
stream_ref(StreamRef) -> StreamRef.
send_data_if_alive(<<>>, State, nofin) ->
State;
%% @todo What if we receive data when the HEAD method was used?
send_data_if_alive(Data, State=#http_state{streams=[Stream=#stream{
is_alive=true, handler_state=Handlers0}|Tail]}, IsFin) ->
Handlers = gun_content_handler:handle(IsFin, Data, Handlers0),
State#http_state{streams=[Stream#stream{handler_state=Handlers}|Tail]};
send_data_if_alive(_, State, _) ->
State.
%% @todo Use Reason.
close(_, State=#http_state{in=body_close, streams=[#stream{ref=StreamRef, reply_to=ReplyTo}|Tail]},
EvHandler, EvHandlerState0) ->
_ = send_data_if_alive(<<>>, State, fin),
EvHandlerState = EvHandler:response_end(#{
stream_ref => StreamRef,
reply_to => ReplyTo
}, EvHandlerState0),
{close_streams(Tail), EvHandlerState};
close(_, #http_state{streams=Streams}, _, EvHandlerState) ->
{close_streams(Streams), EvHandlerState}.
close_streams([]) ->
ok;
close_streams([#stream{is_alive=false}|Tail]) ->
close_streams(Tail);
close_streams([#stream{ref=StreamRef, reply_to=ReplyTo}|Tail]) ->
ReplyTo ! {gun_error, self(), StreamRef, {closed,
"The connection was lost."}},
close_streams(Tail).
%% We don't send a keep-alive when a CONNECT request was initiated.
keepalive(State=#http_state{streams=[#stream{ref={connect, _, _}}]}) ->
State;
%% We can only keep-alive by sending an empty line in-between streams.
keepalive(State=#http_state{socket=Socket, transport=Transport, out=head}) ->
Transport:send(Socket, <<"\r\n">>),
State;
keepalive(State) ->
State.
headers(State=#http_state{out=head},
StreamRef, ReplyTo, Method, Host, Port, Path, Headers,
EvHandler, EvHandlerState0) ->
{Conn, Out, EvHandlerState} = send_request(State, StreamRef, ReplyTo,
Method, Host, Port, Path, Headers, undefined,
EvHandler, EvHandlerState0, ?FUNCTION_NAME),
{new_stream(State#http_state{connection=Conn, out=Out}, StreamRef, ReplyTo, Method),
EvHandlerState}.
request(State=#http_state{out=head}, StreamRef, ReplyTo,
Method, Host, Port, Path, Headers, Body, EvHandler, EvHandlerState0) ->
{Conn, Out, EvHandlerState} = send_request(State, StreamRef, ReplyTo,
Method, Host, Port, Path, Headers, Body,
EvHandler, EvHandlerState0, ?FUNCTION_NAME),
{new_stream(State#http_state{connection=Conn, out=Out}, StreamRef, ReplyTo, Method),
EvHandlerState}.
send_request(State=#http_state{socket=Socket, transport=Transport, version=Version},
StreamRef, ReplyTo, Method, Host, Port, Path, Headers0, Body,
EvHandler, EvHandlerState0, Function) ->
Headers1 = lists:keydelete(<<"transfer-encoding">>, 1, Headers0),
Headers2 = case Body of
undefined -> Headers1;
_ -> lists:keydelete(<<"content-length">>, 1, Headers1)
end,
%% We use Headers2 because this is the smallest list.
Conn = conn_from_headers(Version, Headers2),
Out = case Body of
undefined when Function =:= ws_upgrade -> head;
undefined -> request_io_from_headers(Headers2);
_ -> head
end,
Authority0 = host_header(Transport, Host, Port),
{Authority, Headers3} = case lists:keyfind(<<"host">>, 1, Headers2) of
false -> {Authority0, [{<<"host">>, Authority0}|Headers2]};
{_, Authority1} -> {Authority1, Headers2}
end,
Headers4 = transform_header_names(State, Headers3),
Headers = case {Body, Out} of
{undefined, body_chunked} when Version =:= 'HTTP/1.0' -> Headers4;
{undefined, body_chunked} -> [{<<"transfer-encoding">>, <<"chunked">>}|Headers4];
{undefined, _} -> Headers4;
_ -> [{<<"content-length">>, integer_to_binary(iolist_size(Body))}|Headers4]
end,
RequestEvent = #{
stream_ref => StreamRef,
reply_to => ReplyTo,
function => Function,
method => Method,
authority => Authority,
path => Path,
headers => Headers
},
EvHandlerState1 = EvHandler:request_start(RequestEvent, EvHandlerState0),
Transport:send(Socket, [
cow_http:request(Method, Path, Version, Headers),
[Body || Body =/= undefined]]),
EvHandlerState2 = EvHandler:request_headers(RequestEvent, EvHandlerState1),
EvHandlerState = case Out of
head ->
RequestEndEvent = #{
stream_ref => StreamRef,
reply_to => ReplyTo
},
EvHandler:request_end(RequestEndEvent, EvHandlerState2);
_ ->
EvHandlerState2
end,
{Conn, Out, EvHandlerState}.
host_header(Transport, Host0, Port) ->
Host = case Host0 of
{local, _SocketPath} -> <<>>;
Tuple when is_tuple(Tuple) -> inet:ntoa(Tuple);
Atom when is_atom(Atom) -> atom_to_list(Atom);
_ -> Host0
end,
case {Transport:name(), Port} of
{tcp, 80} -> Host;
{tls, 443} -> Host;
_ -> [Host, $:, integer_to_binary(Port)]
end.
transform_header_names(#http_state{transform_header_name = Fun}, Headers) ->
lists:keymap(Fun, 1, Headers).
%% We are expecting a new stream.
data(State=#http_state{out=head}, StreamRef, ReplyTo, _, _, _, EvHandlerState) ->
{error_stream_closed(State, StreamRef, ReplyTo), EvHandlerState};
%% There are no active streams.
data(State=#http_state{streams=[]}, StreamRef, ReplyTo, _, _, _, EvHandlerState) ->
{error_stream_not_found(State, StreamRef, ReplyTo), EvHandlerState};
%% We can only send data on the last created stream.
data(State=#http_state{socket=Socket, transport=Transport, version=Version,
out=Out, streams=Streams}, StreamRef, ReplyTo, IsFin, Data,
EvHandler, EvHandlerState0) ->
case lists:last(Streams) of
#stream{ref=StreamRef, is_alive=true} ->
DataLength = iolist_size(Data),
case Out of
body_chunked when Version =:= 'HTTP/1.1', IsFin =:= fin ->
case Data of
<<>> ->
Transport:send(Socket, cow_http_te:last_chunk());
_ ->
Transport:send(Socket, [
cow_http_te:chunk(Data),
cow_http_te:last_chunk()
])
end,
RequestEndEvent = #{
stream_ref => StreamRef,
reply_to => ReplyTo
},
EvHandlerState = EvHandler:request_end(RequestEndEvent, EvHandlerState0),
{State#http_state{out=head}, EvHandlerState};
body_chunked when Version =:= 'HTTP/1.1' ->
Transport:send(Socket, cow_http_te:chunk(Data)),
{State, EvHandlerState0};
{body, Length} when DataLength =< Length ->
Transport:send(Socket, Data),
Length2 = Length - DataLength,
if
Length2 =:= 0, IsFin =:= fin ->
RequestEndEvent = #{
stream_ref => StreamRef,
reply_to => ReplyTo
},
EvHandlerState = EvHandler:request_end(RequestEndEvent, EvHandlerState0),
{State#http_state{out=head}, EvHandlerState};
Length2 > 0, IsFin =:= nofin ->
{State#http_state{out={body, Length2}}, EvHandlerState0}
end;
body_chunked -> %% HTTP/1.0
Transport:send(Socket, Data),
{State, EvHandlerState0}
end;
_ ->
{error_stream_not_found(State, StreamRef, ReplyTo), EvHandlerState0}
end.
connect(State=#http_state{streams=Streams}, StreamRef, ReplyTo, _, _) when Streams =/= [] ->
ReplyTo ! {gun_error, self(), StreamRef, {badstate,
"CONNECT can only be used with HTTP/1.1 when no other streams are active."}},
State;
connect(State=#http_state{socket=Socket, transport=Transport, version=Version},
StreamRef, ReplyTo, Destination=#{host := Host0}, Headers0) ->
Host = case Host0 of
Tuple when is_tuple(Tuple) -> inet:ntoa(Tuple);
_ -> Host0
end,
Port = maps:get(port, Destination, 1080),
Authority = [Host, $:, integer_to_binary(Port)],
Headers1 = lists:keydelete(<<"content-length">>, 1,
lists:keydelete(<<"transfer-encoding">>, 1, Headers0)),
Headers2 = case lists:keymember(<<"host">>, 1, Headers1) of
false -> [{<<"host">>, Authority}|Headers1];
true -> Headers1
end,
HasProxyAuthorization = lists:keymember(<<"proxy-authorization">>, 1, Headers2),
Headers3 = case {HasProxyAuthorization, Destination} of
{false, #{username := UserID, password := Password}} ->
[{<<"proxy-authorization">>, [
<<"Basic ">>,
base64:encode(iolist_to_binary([UserID, $:, Password]))]}
|Headers2];
_ ->
Headers2
end,
Headers = transform_header_names(State, Headers3),
Transport:send(Socket, [
cow_http:request(<<"CONNECT">>, Authority, Version, Headers)
]),
new_stream(State, {connect, StreamRef, Destination}, ReplyTo, <<"CONNECT">>).
%% We can't cancel anything, we can just stop forwarding messages to the owner.
cancel(State0, StreamRef, ReplyTo, EvHandler, EvHandlerState0) ->
case is_stream(State0, StreamRef) of
true ->
State = cancel_stream(State0, StreamRef),
EvHandlerState = EvHandler:cancel(#{
stream_ref => StreamRef,
reply_to => ReplyTo,
endpoint => local,
reason => cancel
}, EvHandlerState0),
{State, EvHandlerState};
false ->
{error_stream_not_found(State0, StreamRef, ReplyTo), EvHandlerState0}
end.
stream_info(#http_state{streams=Streams}, StreamRef) ->
case lists:keyfind(StreamRef, #stream.ref, Streams) of
#stream{reply_to=ReplyTo, is_alive=IsAlive} ->
{ok, #{
ref => StreamRef,
reply_to => ReplyTo,
state => case IsAlive of
true -> running;
false -> stopping
end
}};
false ->
{ok, undefined}
end.
%% HTTP does not provide any way to figure out what streams are unprocessed.
down(#http_state{streams=Streams}) ->
KilledStreams = [case Ref of
{connect, Ref2, _} -> Ref2;
{websocket, Ref2, _, _, _} -> Ref2;
_ -> Ref
end || #stream{ref=Ref} <- Streams],
{KilledStreams, []}.
error_stream_closed(State, StreamRef, ReplyTo) ->
ReplyTo ! {gun_error, self(), StreamRef, {badstate,
"The stream has already been closed."}},
State.
error_stream_not_found(State, StreamRef, ReplyTo) ->
ReplyTo ! {gun_error, self(), StreamRef, {badstate,
"The stream cannot be found."}},
State.
%% Headers information retrieval.
conn_from_headers(Version, Headers) ->
case lists:keyfind(<<"connection">>, 1, Headers) of
false when Version =:= 'HTTP/1.0' ->
close;
false ->
keepalive;
{_, ConnHd} ->
conn_from_header(cow_http_hd:parse_connection(ConnHd))
end.
conn_from_header([]) -> close;
conn_from_header([<<"keep-alive">>|_]) -> keepalive;
conn_from_header([<<"upgrade">>|_]) -> keepalive;
conn_from_header([_|Tail]) -> conn_from_header(Tail).
request_io_from_headers(Headers) ->
case lists:keyfind(<<"content-length">>, 1, Headers) of
{_, Length} ->
{body, cow_http_hd:parse_content_length(Length)};
_ ->
body_chunked
end.
response_io_from_headers(<<"HEAD">>, _, _, _) ->
head;
response_io_from_headers(_, _, Status, _) when (Status =:= 204) or (Status =:= 304) ->
head;
response_io_from_headers(_, Version, _Status, Headers) ->
case lists:keyfind(<<"transfer-encoding">>, 1, Headers) of
{_, TE} when Version =:= 'HTTP/1.1' ->
case cow_http_hd:parse_transfer_encoding(TE) of
[<<"chunked">>] -> body_chunked;
[<<"identity">>] -> body_close
end;
_ ->
case lists:keyfind(<<"content-length">>, 1, Headers) of
{_, <<"0">>} ->
head;
{_, Length} ->
{body, cow_http_hd:parse_content_length(Length)};
_ ->
body_close
end
end.
%% Streams.
new_stream(State=#http_state{streams=Streams}, StreamRef, ReplyTo, Method) ->
State#http_state{streams=Streams
++ [#stream{ref=StreamRef, reply_to=ReplyTo,
method=iolist_to_binary(Method), is_alive=true}]}.
is_stream(#http_state{streams=Streams}, StreamRef) ->
lists:keymember(StreamRef, #stream.ref, Streams).
cancel_stream(State=#http_state{streams=Streams}, StreamRef) ->
Streams2 = [case Ref of
StreamRef ->
Tuple#stream{is_alive=false};
_ ->
Tuple
end || Tuple = #stream{ref=Ref} <- Streams],
State#http_state{streams=Streams2}.
end_stream(State=#http_state{streams=[_|Tail]}) ->
State#http_state{in=head, streams=Tail}.
%% Websocket upgrade.
%% Ensure version is 1.1.
ws_upgrade(#http_state{version='HTTP/1.0'}, _, _, _, _, _, _, _, _) ->
error; %% @todo Probably don't error out here, have a protocol function/command.
ws_upgrade(State=#http_state{owner=ReplyTo, out=head},
StreamRef, Host, Port, Path, Headers0, WsOpts,
EvHandler, EvHandlerState0) ->
{Headers1, GunExtensions} = case maps:get(compress, WsOpts, false) of
true -> {[{<<"sec-websocket-extensions">>,
<<"permessage-deflate; client_max_window_bits; server_max_window_bits=15">>}
|Headers0],
[<<"permessage-deflate">>]};
false -> {Headers0, []}
end,
Headers2 = case maps:get(protocols, WsOpts, []) of
[] -> Headers1;
ProtoOpt ->
<< _, _, Proto/bits >> = iolist_to_binary([[<<", ">>, P] || {P, _} <- ProtoOpt]),
[{<<"sec-websocket-protocol">>, Proto}|Headers1]
end,
Key = cow_ws:key(),
Headers = [
{<<"connection">>, <<"upgrade">>},
{<<"upgrade">>, <<"websocket">>},
{<<"sec-websocket-version">>, <<"13">>},
{<<"sec-websocket-key">>, Key}
|Headers2
],
{Conn, Out, EvHandlerState} = send_request(State, StreamRef, ReplyTo,
<<"GET">>, Host, Port, Path, Headers, undefined,
EvHandler, EvHandlerState0, ?FUNCTION_NAME),
{new_stream(State#http_state{connection=Conn, out=Out},
{websocket, StreamRef, Key, GunExtensions, WsOpts}, ReplyTo, <<"GET">>),
EvHandlerState}.
ws_handshake(Buffer, State, StreamRef, Headers, Key, GunExtensions, Opts) ->
%% @todo check upgrade, connection
case lists:keyfind(<<"sec-websocket-accept">>, 1, Headers) of
false ->
close;
{_, Accept} ->
case cow_ws:encode_key(Key) of
Accept ->
ws_handshake_extensions(Buffer, State, StreamRef,
Headers, GunExtensions, Opts);
_ ->
close
end
end.
ws_handshake_extensions(Buffer, State, StreamRef, Headers, GunExtensions, Opts) ->
case lists:keyfind(<<"sec-websocket-extensions">>, 1, Headers) of
false ->
ws_handshake_protocols(Buffer, State, StreamRef, Headers, #{}, Opts);
{_, ExtHd} ->
case ws_validate_extensions(cow_http_hd:parse_sec_websocket_extensions(ExtHd), GunExtensions, #{}, Opts) of
close ->
close;
Extensions ->
ws_handshake_protocols(Buffer, State, StreamRef, Headers, Extensions, Opts)
end
end.
ws_validate_extensions([], _, Acc, _) ->
Acc;
ws_validate_extensions([{Name = <<"permessage-deflate">>, Params}|Tail], GunExts, Acc, Opts) ->
case lists:member(Name, GunExts) of
true ->
case cow_ws:validate_permessage_deflate(Params, Acc, Opts) of
{ok, Acc2} -> ws_validate_extensions(Tail, GunExts, Acc2, Opts);
error -> close
end;
%% Fail the connection if extension was not requested.
false ->
close
end;
%% Fail the connection on unknown extension.
ws_validate_extensions(_, _, _, _) ->
close.
%% @todo Validate protocols.
ws_handshake_protocols(Buffer, State, StreamRef, Headers, Extensions, Opts) ->
case lists:keyfind(<<"sec-websocket-protocol">>, 1, Headers) of
false ->
ws_handshake_end(Buffer, State, StreamRef, Headers, Extensions,
maps:get(default_protocol, Opts, gun_ws_h), Opts);
{_, Proto} ->
ProtoOpt = maps:get(protocols, Opts, []),
case lists:keyfind(Proto, 1, ProtoOpt) of
{_, Handler} ->
ws_handshake_end(Buffer, State, StreamRef,
Headers, Extensions, Handler, Opts);
false ->
close
end
end.
ws_handshake_end(Buffer, #http_state{owner=Owner, socket=Socket, transport=Transport},
StreamRef, Headers, Extensions, Handler, Opts) ->
%% Send ourselves the remaining buffer, if any.
_ = case Buffer of
<<>> ->
ok;
_ ->
{OK, _, _} = Transport:messages(),
self() ! {OK, Socket, Buffer}
end,
gun_ws:init(Owner, Socket, Transport, StreamRef, Headers, Extensions, Handler, Opts).
