%% @author Bob Ippolito %% @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, 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) -> mochiweb_socket_server:start(parse_options(Options)). start_link(Options) -> mochiweb_socket_server:start_link(parse_options(Options)). 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); Other -> handle_invalid_msg_request(Other, Socket, Opts) 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); 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()) -> no_return(). handle_invalid_msg_request(Msg, Socket, Opts) -> handle_invalid_msg_request(Msg, Socket, Opts, {'GET', {abs_path, "/"}, {0,9}}, []). -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.