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%% @author Bob Ippolito <bob@mochimedia.com>
%% @copyright 2007 Mochi Media, Inc.
%%
%% Permission is hereby granted, free of charge, to any person obtaining a
%% copy of this software and associated documentation files (the "Software"),
%% to deal in the Software without restriction, including without limitation
%% the rights to use, copy, modify, merge, publish, distribute, sublicense,
%% and/or sell copies of the Software, and to permit persons to whom the
%% Software is furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
%% THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
%% DEALINGS IN THE SOFTWARE.
%% @doc HTTP server.
-module(mochiweb_http).
-author('bob@mochimedia.com').
-export([start/1, start_link/1, stop/0, stop/1]).
-export([loop/3]).
-export([after_response/2, reentry/1]).
-export([parse_range_request/1, range_skip_length/2]).
-define(REQUEST_RECV_TIMEOUT, 300000). %% timeout waiting for request line
-define(HEADERS_RECV_TIMEOUT, 30000). %% timeout waiting for headers
-define(MAX_HEADERS, 1000).
-define(DEFAULTS, [{name, ?MODULE},
{port, 8888}]).
-ifdef(gen_tcp_r15b_workaround).
r15b_workaround() -> true.
-else.
r15b_workaround() -> false.
-endif.
parse_options(Options) ->
{loop, HttpLoop} = proplists:lookup(loop, Options),
Loop = {?MODULE, loop, [HttpLoop]},
Options1 = [{loop, Loop} | proplists:delete(loop, Options)],
mochilists:set_defaults(?DEFAULTS, Options1).
stop() ->
mochiweb_socket_server:stop(?MODULE).
stop(Name) ->
mochiweb_socket_server:stop(Name).
%% @spec start(Options) -> ServerRet
%% Options = [option()]
%% Option = {name, atom()} | {ip, string() | tuple()} | {backlog, integer()}
%% | {nodelay, boolean()} | {acceptor_pool_size, integer()}
%% | {ssl, boolean()} | {profile_fun, undefined | (Props) -> ok}
%% | {link, false} | {recbuf, undefined | non_negative_integer()}
%% @doc Start a mochiweb server.
%% profile_fun is used to profile accept timing.
%% After each accept, if defined, profile_fun is called with a proplist of a subset of the mochiweb_socket_server state and timing information.
%% The proplist is as follows: [{name, Name}, {port, Port}, {active_sockets, ActiveSockets}, {timing, Timing}].
%% @end
start(Options) ->
ok = ensure_started(mochiweb_clock),
mochiweb_socket_server:start(parse_options(Options)).
start_link(Options) ->
ok = ensure_started(mochiweb_clock),
mochiweb_socket_server:start_link(parse_options(Options)).
ensure_started(M) ->
case M:start() of
{ok, _Pid} ->
ok;
{error, {already_started, _Pid}} ->
ok
end.
loop(Socket, Opts, Body) ->
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{packet, http}])),
request(Socket, Opts, Body).
request(Socket, Opts, Body) ->
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{active, once}])),
receive
{Protocol, _, {http_request, Method, Path, Version}} when Protocol == http orelse Protocol == ssl ->
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{packet, httph}])),
headers(Socket, Opts, {Method, Path, Version}, [], Body, 0);
{Protocol, _, {http_error, "\r\n"}} when Protocol == http orelse Protocol == ssl ->
request(Socket, Opts, Body);
{Protocol, _, {http_error, "\n"}} when Protocol == http orelse Protocol == ssl ->
request(Socket, Opts, Body);
{tcp_closed, _} ->
mochiweb_socket:close(Socket),
exit(normal);
{ssl_closed, _} ->
mochiweb_socket:close(Socket),
exit(normal)
after ?REQUEST_RECV_TIMEOUT ->
mochiweb_socket:close(Socket),
exit(normal)
end.
reentry(Body) ->
fun (Req) ->
?MODULE:after_response(Body, Req)
end.
headers(Socket, Opts, Request, Headers, _Body, ?MAX_HEADERS) ->
%% Too many headers sent, bad request.
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{packet, raw}])),
handle_invalid_request(Socket, Opts, Request, Headers);
headers(Socket, Opts, Request, Headers, Body, HeaderCount) ->
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{active, once}])),
receive
{Protocol, _, http_eoh} when Protocol == http orelse Protocol == ssl ->
Req = new_request(Socket, Opts, Request, Headers),
call_body(Body, Req),
?MODULE:after_response(Body, Req);
{Protocol, _, {http_header, _, Name, _, Value}} when Protocol == http orelse Protocol == ssl ->
headers(Socket, Opts, Request, [{Name, Value} | Headers], Body,
1 + HeaderCount);
{tcp_closed, _} ->
mochiweb_socket:close(Socket),
exit(normal);
{tcp_error, _, emsgsize} = Other ->
handle_invalid_msg_request(Other, Socket, Opts, Request, Headers)
after ?HEADERS_RECV_TIMEOUT ->
mochiweb_socket:close(Socket),
exit(normal)
end.
call_body({M, F, A}, Req) ->
erlang:apply(M, F, [Req | A]);
call_body({M, F}, Req) ->
M:F(Req);
call_body(Body, Req) ->
Body(Req).
-spec handle_invalid_msg_request(term(), term(), term(), term(), term()) -> no_return().
handle_invalid_msg_request(Msg, Socket, Opts, Request, RevHeaders) ->
case {Msg, r15b_workaround()} of
{{tcp_error,_,emsgsize}, true} ->
%% R15B02 returns this then closes the socket, so close and exit
mochiweb_socket:close(Socket),
exit(normal);
_ ->
handle_invalid_request(Socket, Opts, Request, RevHeaders)
end.
-spec handle_invalid_request(term(), term(), term(), term()) -> no_return().
handle_invalid_request(Socket, Opts, Request, RevHeaders) ->
Req = new_request(Socket, Opts, Request, RevHeaders),
Req:respond({400, [], []}),
mochiweb_socket:close(Socket),
exit(normal).
new_request(Socket, Opts, Request, RevHeaders) ->
ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{packet, raw}])),
mochiweb:new_request({Socket, Opts, Request, lists:reverse(RevHeaders)}).
after_response(Body, Req) ->
Socket = Req:get(socket),
case Req:should_close() of
true ->
mochiweb_socket:close(Socket),
exit(normal);
false ->
Req:cleanup(),
erlang:garbage_collect(),
?MODULE:loop(Socket, mochiweb_request:get(opts, Req), Body)
end.
parse_range_request(RawRange) when is_list(RawRange) ->
try
"bytes=" ++ RangeString = RawRange,
RangeTokens = [string:strip(R) || R <- string:tokens(RangeString, ",")],
Ranges = [R || R <- RangeTokens, string:len(R) > 0],
lists:map(fun ("-" ++ V) ->
{none, list_to_integer(V)};
(R) ->
case string:tokens(R, "-") of
[S1, S2] ->
{list_to_integer(S1), list_to_integer(S2)};
[S] ->
{list_to_integer(S), none}
end
end,
Ranges)
catch
_:_ ->
fail
end.
range_skip_length(Spec, Size) ->
case Spec of
{none, R} when R =< Size, R >= 0 ->
{Size - R, R};
{none, _OutOfRange} ->
{0, Size};
{R, none} when R >= 0, R < Size ->
{R, Size - R};
{_OutOfRange, none} ->
invalid_range;
{Start, End} when Start >= 0, Start < Size, Start =< End ->
{Start, erlang:min(End + 1, Size) - Start};
{_InvalidStart, _InvalidEnd} ->
invalid_range
end.
%%
%% Tests
%%
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
range_test() ->
%% valid, single ranges
?assertEqual([{20, 30}], parse_range_request("bytes=20-30")),
?assertEqual([{20, none}], parse_range_request("bytes=20-")),
?assertEqual([{none, 20}], parse_range_request("bytes=-20")),
%% trivial single range
?assertEqual([{0, none}], parse_range_request("bytes=0-")),
%% invalid, single ranges
?assertEqual(fail, parse_range_request("")),
?assertEqual(fail, parse_range_request("garbage")),
?assertEqual(fail, parse_range_request("bytes=-20-30")),
%% valid, multiple range
?assertEqual(
[{20, 30}, {50, 100}, {110, 200}],
parse_range_request("bytes=20-30,50-100,110-200")),
?assertEqual(
[{20, none}, {50, 100}, {none, 200}],
parse_range_request("bytes=20-,50-100,-200")),
%% valid, multiple range with whitespace
?assertEqual(
[{20, 30}, {50, 100}, {110, 200}],
parse_range_request("bytes=20-30, 50-100 , 110-200")),
%% valid, multiple range with extra commas
?assertEqual(
[{20, 30}, {50, 100}, {110, 200}],
parse_range_request("bytes=20-30,,50-100,110-200")),
?assertEqual(
[{20, 30}, {50, 100}, {110, 200}],
parse_range_request("bytes=20-30, ,50-100,,,110-200")),
%% no ranges
?assertEqual([], parse_range_request("bytes=")),
ok.
range_skip_length_test() ->
Body = <<"012345678901234567890123456789012345678901234567890123456789">>,
BodySize = byte_size(Body), %% 60
BodySize = 60,
%% these values assume BodySize =:= 60
?assertEqual({1,9}, range_skip_length({1,9}, BodySize)), %% 1-9
?assertEqual({10,10}, range_skip_length({10,19}, BodySize)), %% 10-19
?assertEqual({40, 20}, range_skip_length({none, 20}, BodySize)), %% -20
?assertEqual({30, 30}, range_skip_length({30, none}, BodySize)), %% 30-
%% valid edge cases for range_skip_length
?assertEqual({BodySize, 0}, range_skip_length({none, 0}, BodySize)),
?assertEqual({0, BodySize}, range_skip_length({none, BodySize}, BodySize)),
?assertEqual({0, BodySize}, range_skip_length({0, none}, BodySize)),
?assertEqual({0, BodySize}, range_skip_length({0, BodySize + 1}, BodySize)),
BodySizeLess1 = BodySize - 1,
?assertEqual({BodySizeLess1, 1},
range_skip_length({BodySize - 1, none}, BodySize)),
?assertEqual({BodySizeLess1, 1},
range_skip_length({BodySize - 1, BodySize+5}, BodySize)),
?assertEqual({BodySizeLess1, 1},
range_skip_length({BodySize - 1, BodySize}, BodySize)),
%% out of range, return whole thing
?assertEqual({0, BodySize},
range_skip_length({none, BodySize + 1}, BodySize)),
?assertEqual({0, BodySize},
range_skip_length({none, -1}, BodySize)),
?assertEqual({0, BodySize},
range_skip_length({0, BodySize + 1}, BodySize)),
%% invalid ranges
?assertEqual(invalid_range,
range_skip_length({-1, 30}, BodySize)),
?assertEqual(invalid_range,
range_skip_length({-1, BodySize + 1}, BodySize)),
?assertEqual(invalid_range,
range_skip_length({BodySize, 40}, BodySize)),
?assertEqual(invalid_range,
range_skip_length({-1, none}, BodySize)),
?assertEqual(invalid_range,
range_skip_length({BodySize, none}, BodySize)),
?assertEqual(invalid_range,
range_skip_length({BodySize + 1, BodySize + 5}, BodySize)),
ok.
-endif.
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