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%% Copyright (c) 2017, 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(http2_SUITE).
-compile(export_all).
-compile(nowarn_export_all).

-import(ct_helper, [config/2]).
-import(ct_helper, [doc/1]).
-import(ct_helper, [get_remote_pid_tcp/1]).
-import(cowboy_test, [gun_open/1]).

all() -> [{group, clear}].

groups() -> [{clear, [parallel], ct_helper:all(?MODULE)}].

init_dispatch(_) ->
	cowboy_router:compile([{"localhost", [
		{"/", hello_h, []},
		{"/echo/:key", echo_h, []},
		{"/resp_iolist_body", resp_iolist_body_h, []}
	]}]).

%% Do a prior knowledge handshake (function originally copied from rfc7540_SUITE).
do_handshake(Config) ->
	do_handshake(#{}, Config).

do_handshake(Settings, Config) ->
	{ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]),
	%% Send a valid preface.
	ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(Settings)]),
	%% Receive the server preface.
	{ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000),
	{ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000),
	%% Send the SETTINGS ack.
	ok = gen_tcp:send(Socket, cow_http2:settings_ack()),
	%% Receive the SETTINGS ack.
	{ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000),
	{ok, Socket}.

idle_timeout(Config) ->
	doc("Terminate when the idle timeout is reached."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		idle_timeout => 1000
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		timer:sleep(1000),
		%% Receive a GOAWAY frame back with NO_ERROR.
		{ok, << _:24, 7:8, _:72, 0:32 >>} = gen_tcp:recv(Socket, 17, 1000)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

idle_timeout_infinity(Config) ->
	doc("Ensure the idle_timeout option accepts the infinity value."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		idle_timeout => infinity
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		timer:sleep(1000),
		%% Don't receive a GOAWAY frame.
		{error, timeout} = gen_tcp:recv(Socket, 17, 1000)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

idle_timeout_reset_on_data(Config) ->
	doc("Terminate when the idle timeout is reached."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		idle_timeout => 1000
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		%% We wait a little, send a PING, receive a PING ack.
		{error, timeout} = gen_tcp:recv(Socket, 17, 500),
		ok = gen_tcp:send(Socket, cow_http2:ping(0)),
		{ok, <<8:24, 6:8, 0:7, 1:1, 0:96>>} = gen_tcp:recv(Socket, 17, 1000),
		%% Again.
		{error, timeout} = gen_tcp:recv(Socket, 17, 500),
		ok = gen_tcp:send(Socket, cow_http2:ping(0)),
		{ok, <<8:24, 6:8, 0:7, 1:1, 0:96>>} = gen_tcp:recv(Socket, 17, 1000),
		%% And one more time.
		{error, timeout} = gen_tcp:recv(Socket, 17, 500),
		ok = gen_tcp:send(Socket, cow_http2:ping(0)),
		{ok, <<8:24, 6:8, 0:7, 1:1, 0:96>>} = gen_tcp:recv(Socket, 17, 1000),
		%% The connection goes away soon after we stop sending data.
		timer:sleep(1000),
		{ok, << _:24, 7:8, _:72, 0:32 >>} = gen_tcp:recv(Socket, 17, 1000)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

inactivity_timeout(Config) ->
	doc("Terminate when the inactivity timeout is reached."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		inactivity_timeout => 1000
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		receive after 1000 -> ok end,
		%% Receive a GOAWAY frame back with an INTERNAL_ERROR.
		{ok, << _:24, 7:8, _:72, 2:32 >>} = gen_tcp:recv(Socket, 17, 1000)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

initial_connection_window_size(Config) ->
	doc("Confirm a WINDOW_UPDATE frame is sent when the configured "
		"connection window is larger than the default."),
	ConfiguredSize = 100000,
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		initial_connection_window_size => ConfiguredSize
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = gen_tcp:connect("localhost", Port, [binary, {active, false}]),
		%% Send a valid preface.
		ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]),
		%% Receive the server preface.
		{ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000),
		{ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000),
		%% Receive a WINDOW_UPDATE frame incrementing the connection window to 100000.
		{ok, <<4:24, 8:8, 0:41, Size:31>>} = gen_tcp:recv(Socket, 13, 1000),
		ConfiguredSize = Size + 65535
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

max_frame_size_sent(Config) ->
	doc("Confirm that frames sent by Cowboy are limited in size "
		"by the max_frame_size_sent configuration value."),
	MaxFrameSize = 20000,
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		max_frame_size_sent => MaxFrameSize
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake(#{max_frame_size => MaxFrameSize + 10000},
			[{port, Port}|Config]),
		%% Send a request with a 30000 bytes body.
		{HeadersBlock, _} = cow_hpack:encode([
			{<<":method">>, <<"POST">>},
			{<<":scheme">>, <<"http">>},
			{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
			{<<":path">>, <<"/echo/read_body">>}
		]),
		ok = gen_tcp:send(Socket, [
			cow_http2:headers(1, nofin, HeadersBlock),
			cow_http2:data(1, nofin, <<0:16384/unit:8>>),
			cow_http2:data(1, fin, <<0:13616/unit:8>>)
		]),
		%% Receive a HEADERS frame as a response.
		{ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = case gen_tcp:recv(Socket, 9, 1000) of
			%% We received a WINDOW_UPDATE first. Skip it and the next.
			{ok, <<4:24, 8:8, 0:40>>} ->
				{ok, _} = gen_tcp:recv(Socket, 4 + 13, 1000),
				gen_tcp:recv(Socket, 9, 1000);
			Res ->
				Res
		end,
		{ok, _} = gen_tcp:recv(Socket, SkipLen, 6000),
		%% The DATA frames following must have lengths of 20000
		%% and then 10000 due to the limit.
		{ok, <<20000:24, 0:8, _:40, _:20000/unit:8>>} = gen_tcp:recv(Socket, 20009, 6000),
		{ok, <<10000:24, 0:8, _:40, _:10000/unit:8>>} = gen_tcp:recv(Socket, 10009, 6000)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

persistent_term_router(Config) ->
	doc("The router can retrieve the routes from persistent_term storage."),
	case erlang:function_exported(persistent_term, get, 1) of
		true -> do_persistent_term_router(Config);
		false -> {skip, "This test uses the persistent_term functionality added in Erlang/OTP 21.2."}
	end.

do_persistent_term_router(Config) ->
	persistent_term:put(?FUNCTION_NAME, init_dispatch(Config)),
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], #{
		env => #{dispatch => {persistent_term, ?FUNCTION_NAME}}
	}),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		ConnPid = gun_open([{type, tcp}, {protocol, http2}, {port, Port}|Config]),
		{ok, http2} = gun:await_up(ConnPid),
		StreamRef = gun:get(ConnPid, "/"),
		{response, nofin, 200, _} = gun:await(ConnPid, StreamRef),
		gun:close(ConnPid)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

preface_timeout_infinity(Config) ->
	doc("Ensure infinity for preface_timeout is accepted."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		preface_timeout => infinity
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		Pid = get_remote_pid_tcp(Socket),
		Ref = erlang:monitor(process, Pid),
		receive
			{'DOWN', Ref, process, Pid, Reason} ->
				error(Reason)
		after 1000 ->
			ok
		end
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

resp_iolist_body(Config) ->
	doc("Regression test when response bodies are iolists that "
		"include improper lists, empty lists and empty binaries. "
		"The original issue failed to split the body into frames properly."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)}
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		ConnPid = gun_open([{type, tcp}, {protocol, http2}, {port, Port}|Config]),
		Ref = gun:get(ConnPid, "/resp_iolist_body"),
		{response, nofin, 200, RespHeaders} = gun:await(ConnPid, Ref),
		{_, BinLen} = lists:keyfind(<<"content-length">>, 1, RespHeaders),
		Len = binary_to_integer(BinLen),
		{ok, RespBody} = gun:await_body(ConnPid, Ref),
		Len = iolist_size(RespBody),
		gun:close(ConnPid)
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

settings_timeout_infinity(Config) ->
	doc("Ensure infinity for settings_timeout is accepted."),
	ProtoOpts = #{
		env => #{dispatch => init_dispatch(Config)},
		settings_timeout => infinity
	},
	{ok, _} = cowboy:start_clear(?FUNCTION_NAME, [{port, 0}], ProtoOpts),
	Port = ranch:get_port(?FUNCTION_NAME),
	try
		{ok, Socket} = do_handshake([{port, Port}|Config]),
		Pid = get_remote_pid_tcp(Socket),
		Ref = erlang:monitor(process, Pid),
		receive
			{'DOWN', Ref, process, Pid, Reason} ->
				error(Reason)
		after 1000 ->
			ok
		end
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.