1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
|
%% Copyright (c) 2013-2015, 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([response/3]).
-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].
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);
_ -> ?LOWER(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].
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,
%% removing any fragment component.
-spec parse_fullpath(binary()) -> {binary(), binary()}.
parse_fullpath(Fullpath) ->
parse_fullpath(Fullpath, <<>>).
parse_fullpath(<<>>, Path) -> {Path, <<>>};
parse_fullpath(<< $#, _/bits >>, Path) -> {Path, <<>>};
parse_fullpath(<< $?, Qs/bits >>, Path) -> parse_fullpath_query(Qs, Path, <<>>);
parse_fullpath(<< C, Rest/bits >>, SoFar) -> parse_fullpath(Rest, << SoFar/binary, C >>).
parse_fullpath_query(<<>>, Path, Query) -> {Path, Query};
parse_fullpath_query(<< $#, _/bits >>, Path, Query) -> {Path, Query};
parse_fullpath_query(<< C, Rest/bits >>, Path, SoFar) ->
parse_fullpath_query(Rest, Path, << SoFar/binary, C >>).
-ifdef(TEST).
parse_fullpath_test() ->
{<<"*">>, <<>>} = parse_fullpath(<<"*">>),
{<<"/">>, <<>>} = parse_fullpath(<<"/">>),
{<<"/path/to/resource">>, <<>>} = parse_fullpath(<<"/path/to/resource#fragment">>),
{<<"/path/to/resource">>, <<>>} = parse_fullpath(<<"/path/to/resource">>),
{<<"/">>, <<>>} = parse_fullpath(<<"/?">>),
{<<"/">>, <<"q=cowboy">>} = parse_fullpath(<<"/?q=cowboy#fragment">>),
{<<"/">>, <<"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">>].
-spec response(status() | binary(), version(), headers()) -> iodata().
response(Status, Version, Headers) ->
[version(Version), <<" ">>, status(Status), <<"\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.
%% @doc Return the status code and string as binary.
-spec status(status() | binary()) -> binary().
status(100) -> <<"100 Continue">>;
status(101) -> <<"101 Switching Protocols">>;
status(102) -> <<"102 Processing">>;
status(200) -> <<"200 OK">>;
status(201) -> <<"201 Created">>;
status(202) -> <<"202 Accepted">>;
status(203) -> <<"203 Non-Authoritative Information">>;
status(204) -> <<"204 No Content">>;
status(205) -> <<"205 Reset Content">>;
status(206) -> <<"206 Partial Content">>;
status(207) -> <<"207 Multi-Status">>;
status(226) -> <<"226 IM Used">>;
status(300) -> <<"300 Multiple Choices">>;
status(301) -> <<"301 Moved Permanently">>;
status(302) -> <<"302 Found">>;
status(303) -> <<"303 See Other">>;
status(304) -> <<"304 Not Modified">>;
status(305) -> <<"305 Use Proxy">>;
status(306) -> <<"306 Switch Proxy">>;
status(307) -> <<"307 Temporary Redirect">>;
status(400) -> <<"400 Bad Request">>;
status(401) -> <<"401 Unauthorized">>;
status(402) -> <<"402 Payment Required">>;
status(403) -> <<"403 Forbidden">>;
status(404) -> <<"404 Not Found">>;
status(405) -> <<"405 Method Not Allowed">>;
status(406) -> <<"406 Not Acceptable">>;
status(407) -> <<"407 Proxy Authentication Required">>;
status(408) -> <<"408 Request Timeout">>;
status(409) -> <<"409 Conflict">>;
status(410) -> <<"410 Gone">>;
status(411) -> <<"411 Length Required">>;
status(412) -> <<"412 Precondition Failed">>;
status(413) -> <<"413 Request Entity Too Large">>;
status(414) -> <<"414 Request-URI Too Long">>;
status(415) -> <<"415 Unsupported Media Type">>;
status(416) -> <<"416 Requested Range Not Satisfiable">>;
status(417) -> <<"417 Expectation Failed">>;
status(418) -> <<"418 I'm a teapot">>;
status(422) -> <<"422 Unprocessable Entity">>;
status(423) -> <<"423 Locked">>;
status(424) -> <<"424 Failed Dependency">>;
status(425) -> <<"425 Unordered Collection">>;
status(426) -> <<"426 Upgrade Required">>;
status(428) -> <<"428 Precondition Required">>;
status(429) -> <<"429 Too Many Requests">>;
status(431) -> <<"431 Request Header Fields Too Large">>;
status(500) -> <<"500 Internal Server Error">>;
status(501) -> <<"501 Not Implemented">>;
status(502) -> <<"502 Bad Gateway">>;
status(503) -> <<"503 Service Unavailable">>;
status(504) -> <<"504 Gateway Timeout">>;
status(505) -> <<"505 HTTP Version Not Supported">>;
status(506) -> <<"506 Variant Also Negotiates">>;
status(507) -> <<"507 Insufficient Storage">>;
status(510) -> <<"510 Not Extended">>;
status(511) -> <<"511 Network Authentication Required">>;
status(B) when is_binary(B) -> B.
|
