%% Copyright (c) 2013-2014, 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(cow_http).
%% @todo parse_request_line
-export([parse_status_line/1]).
-export([parse_headers/1]).
-export([parse_fullpath/1]).
-export([parse_version/1]).
-export([request/4]).
-export([version/1]).
-type version() :: 'HTTP/1.0' | 'HTTP/1.1'.
-type status() :: 100..999.
-type headers() :: [{binary(), iodata()}].
-include("cow_inline.hrl").
%% @doc Parse the status line.
-spec parse_status_line(binary()) -> {version(), status(), binary(), binary()}.
parse_status_line(<< "HTTP/1.1 200 OK\r\n", Rest/bits >>) ->
{'HTTP/1.1', 200, <<"OK">>, Rest};
parse_status_line(<< "HTTP/1.1 404 Not Found\r\n", Rest/bits >>) ->
{'HTTP/1.1', 404, <<"Not Found">>, Rest};
parse_status_line(<< "HTTP/1.1 500 Internal Server Error\r\n", Rest/bits >>) ->
{'HTTP/1.1', 500, <<"Internal Server Error">>, Rest};
parse_status_line(<< "HTTP/1.1 ", Status/bits >>) ->
parse_status_line(Status, 'HTTP/1.1');
parse_status_line(<< "HTTP/1.0 ", Status/bits >>) ->
parse_status_line(Status, 'HTTP/1.0').
parse_status_line(<< H, T, U, " ", Rest/bits >>, Version)
when $0 =< H, H =< $9, $0 =< T, T =< $9, $0 =< U, U =< $9 ->
Status = (H - $0) * 100 + (T - $0) * 10 + (U - $0),
{Pos, _} = binary:match(Rest, <<"\r">>),
<< StatusStr:Pos/binary, "\r\n", Rest2/bits >> = Rest,
{Version, Status, StatusStr, Rest2}.
-ifdef(TEST).
parse_status_line_test_() ->
Tests = [
{<<"HTTP/1.1 200 OK\r\nRest">>,
{'HTTP/1.1', 200, <<"OK">>, <<"Rest">>}},
{<<"HTTP/1.0 404 Not Found\r\nRest">>,
{'HTTP/1.0', 404, <<"Not Found">>, <<"Rest">>}},
{<<"HTTP/1.1 500 Something very funny here\r\nRest">>,
{'HTTP/1.1', 500, <<"Something very funny here">>, <<"Rest">>}},
{<<"HTTP/1.1 200 \r\nRest">>,
{'HTTP/1.1', 200, <<>>, <<"Rest">>}}
],
[{V, fun() -> R = parse_status_line(V) end}
|| {V, R} <- Tests].
parse_status_line_error_test_() ->
Tests = [
<<>>,
<<"HTTP/1.1">>,
<<"HTTP/1.1 200\r\n">>,
<<"HTTP/1.1 200 OK">>,
<<"HTTP/1.1 200 OK\r">>,
<<"HTTP/1.1 200 OK\n">>,
<<"HTTP/0.9 200 OK\r\n">>,
<<"HTTP/1.1 42 Answer\r\n">>,
<<"HTTP/1.1 999999999 More than OK\r\n">>,
<<"content-type: text/plain\r\n">>,
<<0:80, "\r\n">>
],
[{V, fun() -> {'EXIT', _} = (catch parse_status_line(V)) end}
|| V <- Tests].
-endif.
-ifdef(PERF).
horse_parse_status_line_200() ->
horse:repeat(200000,
parse_status_line(<<"HTTP/1.1 200 OK\r\n">>)
).
horse_parse_status_line_404() ->
horse:repeat(200000,
parse_status_line(<<"HTTP/1.1 404 Not Found\r\n">>)
).
horse_parse_status_line_500() ->
horse:repeat(200000,
parse_status_line(<<"HTTP/1.1 500 Internal Server Error\r\n">>)
).
horse_parse_status_line_other() ->
horse:repeat(200000,
parse_status_line(<<"HTTP/1.1 416 Requested range not satisfiable\r\n">>)
).
-endif.
%% @doc Parse the list of headers.
-spec parse_headers(binary()) -> {[{binary(), binary()}], binary()}.
parse_headers(Data) ->
parse_header(Data, []).
parse_header(<< $\r, $\n, Rest/bits >>, Acc) ->
{lists:reverse(Acc), Rest};
parse_header(Data, Acc) ->
parse_hd_name(Data, Acc, <<>>).
parse_hd_name(<< C, Rest/bits >>, Acc, SoFar) ->
case C of
$: -> parse_hd_before_value(Rest, Acc, SoFar);
$\s -> parse_hd_name_ws(Rest, Acc, SoFar);
$\t -> parse_hd_name_ws(Rest, Acc, SoFar);
?INLINE_LOWERCASE(parse_hd_name, Rest, Acc, SoFar)
end.
parse_hd_name_ws(<< C, Rest/bits >>, Acc, Name) ->
case C of
$: -> parse_hd_before_value(Rest, Acc, Name);
$\s -> parse_hd_name_ws(Rest, Acc, Name);
$\t -> parse_hd_name_ws(Rest, Acc, Name)
end.
parse_hd_before_value(<< $\s, Rest/bits >>, Acc, Name) ->
parse_hd_before_value(Rest, Acc, Name);
parse_hd_before_value(<< $\t, Rest/bits >>, Acc, Name) ->
parse_hd_before_value(Rest, Acc, Name);
parse_hd_before_value(Data, Acc, Name) ->
parse_hd_value(Data, Acc, Name, <<>>).
parse_hd_value(<< $\r, Rest/bits >>, Acc, Name, SoFar) ->
case Rest of
<< $\n, C, Rest2/bits >> when C =:= $\s; C =:= $\t ->
parse_hd_value(Rest2, Acc, Name, << SoFar/binary, C >>);
<< $\n, Rest2/bits >> ->
parse_header(Rest2, [{Name, SoFar}|Acc])
end;
parse_hd_value(<< C, Rest/bits >>, Acc, Name, SoFar) ->
parse_hd_value(Rest, Acc, Name, << SoFar/binary, C >>).
-ifdef(TEST).
parse_headers_test_() ->
Tests = [
{<<"\r\nRest">>,
{[], <<"Rest">>}},
{<<"Server: Erlang/R17\r\n"
"Date: Sun, 23 Feb 2014 09:30:39 GMT\r\n"
"Multiline-Header: why hello!\r\n"
" I didn't see you all the way over there!\r\n"
"Content-Length: 12\r\n"
"Content-Type: text/plain\r\n"
"\r\nRest">>,
{[{<<"server">>, <<"Erlang/R17">>},
{<<"date">>, <<"Sun, 23 Feb 2014 09:30:39 GMT">>},
{<<"multiline-header">>,
<<"why hello! I didn't see you all the way over there!">>},
{<<"content-length">>, <<"12">>},
{<<"content-type">>, <<"text/plain">>}],
<<"Rest">>}}
],
[{V, fun() -> R = parse_headers(V) end}
|| {V, R} <- Tests].
parse_headers_error_test_() ->
Tests = [
<<>>,
<<"\r">>,
<<"Malformed\r\n\r\n">>,
<<"content-type: text/plain\r\nMalformed\r\n\r\n">>,
<<"HTTP/1.1 200 OK\r\n\r\n">>,
<<0:80, "\r\n\r\n">>,
<<"content-type: text/plain\r\ncontent-length: 12\r\n">>
],
[{V, fun() -> {'EXIT', _} = (catch parse_headers(V)) end}
|| V <- Tests].
-endif.
-ifdef(PERF).
horse_parse_headers() ->
horse:repeat(50000,
parse_headers(<<"Server: Erlang/R17\r\n"
"Date: Sun, 23 Feb 2014 09:30:39 GMT\r\n"
"Multiline-Header: why hello!\r\n"
" I didn't see you all the way over there!\r\n"
"Content-Length: 12\r\n"
"Content-Type: text/plain\r\n"
"\r\nRest">>)
).
-endif.
%% @doc Extract path and query string from a binary.
-spec parse_fullpath(binary()) -> {binary(), binary()}.
parse_fullpath(Fullpath) ->
parse_fullpath(Fullpath, <<>>).
parse_fullpath(<<>>, Path) ->
{Path, <<>>};
parse_fullpath(<< $?, Qs/binary >>, Path) ->
{Path, Qs};
parse_fullpath(<< C, Rest/binary >>, SoFar) ->
parse_fullpath(Rest, << SoFar/binary, C >>).
-ifdef(TEST).
parse_fullpath_test() ->
{<<"*">>, <<>>} = parse_fullpath(<<"*">>),
{<<"/">>, <<>>} = parse_fullpath(<<"/">>),
{<<"/path/to/resource">>, <<>>} = parse_fullpath(<<"/path/to/resource">>),
{<<"/">>, <<>>} = parse_fullpath(<<"/?">>),
{<<"/">>, <<"q=cowboy">>} = parse_fullpath(<<"/?q=cowboy">>),
{<<"/path/to/resource">>, <<"q=cowboy">>}
= parse_fullpath(<<"/path/to/resource?q=cowboy">>),
ok.
-endif.
%% @doc Convert an HTTP version to atom.
-spec parse_version(binary()) -> version().
parse_version(<<"HTTP/1.1">>) -> 'HTTP/1.1';
parse_version(<<"HTTP/1.0">>) -> 'HTTP/1.0'.
-ifdef(TEST).
parse_version_test() ->
'HTTP/1.1' = parse_version(<<"HTTP/1.1">>),
'HTTP/1.0' = parse_version(<<"HTTP/1.0">>),
{'EXIT', _} = (catch parse_version(<<"HTTP/1.2">>)),
ok.
-endif.
%% @doc Return formatted request-line and headers.
%% @todo Add tests when the corresponding reverse functions are added.
-spec request(binary(), iodata(), version(), headers()) -> iodata().
request(Method, Path, Version, Headers) ->
[Method, <<" ">>, Path, <<" ">>, version(Version), <<"\r\n">>,
[[N, <<": ">>, V, <<"\r\n">>] || {N, V} <- Headers],
<<"\r\n">>].
%% @doc Return the version as a binary.
-spec version(version()) -> binary().
version('HTTP/1.1') -> <<"HTTP/1.1">>;
version('HTTP/1.0') -> <<"HTTP/1.0">>.
-ifdef(TEST).
version_test() ->
<<"HTTP/1.1">> = version('HTTP/1.1'),
<<"HTTP/1.0">> = version('HTTP/1.0'),
{'EXIT', _} = (catch version('HTTP/1.2')),
ok.
-endif.
